JPH07304120A - Molded component and its production - Google Patents

Abstract

PURPOSE: To provide a molded article preventing an injection molding material from flowing in the through-hole of a fastener nut element when the injection molding material is molded into a panel fitted with the fastener nut element. CONSTITUTION: A molded article consists of a fastener nut element having a panel 18 having a hole, a body part 15 and a rivet part 16 integrally formed to the body part 15 coaxially and piercing through the hole of the panel 18 to be fastened to the panel 18 by a rivet, the slag inserted in the rivet part 16 to hermetically seal the through-hole 29 of the body part 15 and a molded part sealing the panel 18 and the rivet part 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded part and a manufacturing method thereof, and more particularly to a molded part having at least one nut element subjected to a rivet process and a manufacturing method thereof.

[0002]

2. Description of the Related Art Molded parts or metal parts of this kind are disclosed, for example, in German Patent Nos. 3447006 and 34.
46978 and German Patent Publication No. 301,667.
No. 5 is disclosed.

The nut element disclosed in German Patent No. 3447006 is a piercing rivet nut (punched bed nut). For punching and riveting, the nut element has a nut part and a punching rivet part, which is connected to the nut part via an outwardly facing ring-shaped shoulder. The stamping head guides the nut element into the sheet metal, the sheet metal is punched by the punching rivet portion, and the slag corresponding to the shape of the hole of the punching rivet portion is punched. continue,
The tubular punched rivet part is driven to pass the sheet metal to form a rivet flange bent to the side of the sheet metal opposite to the nut part. This causes the sheet metal to be disposed in a form fit between the bent rivet flange and the ring shoulder. The protrusion or rib in the region of the ring-shaped shoulder of the nut element is pressed against the sheet metal during the insertion of the punching rivet into the sheet metal to securely stop the rotation of the nut element and to insert the bolt, The nut does not rotate with respect to the sheet metal.

As described in DE 34 47 06, the punched slug must be removed before the nut element can be used for its purpose. This is accomplished by having the push pin pass through the threaded hole in the nut element and extruding the slag from a stamped rivet that has deformed the slag.

[0005]

SUMMARY OF THE INVENTION The object of the invention is in particular a sheet metal part, which is suitable for being embedded in an injection-molded article and which is made of plastic injection-molded material without flowing into the thread of the nut element. It is an object of the present invention to provide a sheet metal that is injection-molded around a sheet metal and a manufacturing method thereof.

This objective could be achieved, for example, by closing both ends of the nut element in the injection molding die by means of walls facing the ends of the nut element of the die or special inserts arranged at both ends of the nut element. However, this would limit the layout of the injection molding die, and would be rather complex and expensive to construct and manufacture. A further object of the present invention is to provide a great degree of freedom in the layout of an injection molded part in which a nut element used in a sheet metal is embedded, and to perform injection molding and complicate the structure and manufacturing of the injection molded product. In addition, it is to reduce the cost.

[0007]

In order to achieve these objects, according to the present invention, a hole of a nut element is closed with a slug formed by stamping to form a sheet metal as follows.

The slug is conveniently formed during the mounting of the nut element to the sheet metal to substantially seal the stamped rivet portion of the nut element, and preferably in a form fit within the stamped rivet portion. It is deformed to be retained. To do this, a nut is produced, preferably in the form of a stamping disc (thus considered a stamped slug), in the form of a "cover" that has been pre-riveted to sheet metal and then riveted. Insert into an element. In this case, it is preferable to form holes in the sheet metal in advance. This is often necessary if the sheet metal is a plate or panel and self-punching nuts (self-piercing nuts) cannot be used. It is also conceivable to insert the stamped slug into the punched rivet part of the nut element instead of the nut element and insert the bolt from the bent rivet flange rather than from the nut side. To be

When closing the nut element at one end, the sheet metal with nut element is arranged so that one wall of the injection molding die or one side of the insert is aligned with the screw side opening of the nut element and injection molded. Prevent the material from entering the screw. Since the other end of the screw is sealed by a stamped slug, there is a great deal of freedom in the layout of the injection molding die and the shape of the injection molding part. This is possible because neither the die wall nor the insert is provided on the wall of the nut element closed by the stamped slug in order to prevent the injection molding material from penetrating the screw. The sheet metal provided with the nut element with stamped slugs can take various forms.

Retaining the stamped slug in the nut element by forming the end of the rivet, which is bent so as to extend upward from the slug opposite the screw, into a substantially conical shape. Is especially important because the slag is retained for dropouts.

It would also be desirable to have a structure in which the slug is housed in a ring-shaped space for the slug or the rim of the rivet that is bent and at least substantially seals the opening (passage) of the nut element. For this reason, it is advantageous for the slug to exert a permanent compressive pressure on the bottom of the ring-shaped groove formed in the stamped rivet portion when bending the inner wall of the nut element, preferably the rivet flange. In this way, not only is the slag sealing function secured, but there is no risk of deformation of the injection-molded material due to pressure. In other words, the slag exerts a compressive pressure to ensure a firm seating of the nut element, so there is no risk of the nut element loosening during the torque or bending moment.

For example, a rib-shaped raised portion is formed on the ring-shaped shoulder portion of the nut element, and after the sheet metal is introduced, the raised portion is engaged with the corresponding raised portion of the sheet metal.
Securely prevent rotation.

It is desirable to insert the bent rim of the rivet into the recess of the sheet metal to secure the nut element to the sheet metal. In practice, the recess of the sheet metal is substantially conical and runs into the base of the recess in the region of the ring-shaped shoulder of the nut element. The base surface is oriented substantially parallel to the flange and is provided with an opening for the punch rivet of the nut element.

The bent rivet flange can be submerged in the recess. That is, the end face of the rivet flange is below the plane of the sheet metal on the rivet flange side. However, the bent rivet flanges may be flush with this plane or may project beyond this plane.

If the bent rivet flange takes on a flush or sunken structure, a relatively thin layer of injection-molded material is only required on this side and the sheet metal is completely sealed from this side of the sheet metal. It can be placed and protected from corrosion. Therefore, the presence of the concave portion locally strengthens the sheet metal, and the load characteristic of the nut element is increased in the sense that a larger force is transmitted from the nut element to the sheet metal without breaking the connection portion. .

For example, the base of the recess may be connected to a connection that connects the nut element to the collar in the axial direction. Furthermore, the base and at least a substantial part of the collar optionally formed therein are provided in a form-fitting manner in the recess of the nut element between the ring-shaped shoulder and the bent rivet flange. There is.

The present invention also includes an injection molded part molded around the sheet metal. That is, the injection molded material partially surrounds the sheet metal so that the threads of the nut element are freely accessible from the outside. That is, the screw is not covered by the injection molding material but can receive the male screw.

An example of an injection molded part is the sole of a sports shoe. Here, the nut element is specially configured for attachments such as replaceable spikes or studs. For example, a corrugated or perforated steel slab can be selected as the sheet metal in order to ensure the flexibility of the shoe sole.
For example, the shoe sole may be made of flexible spring steel having a wavelength of about 3 mm and a wave length of about 8 m (sine wave). The injection-molded material in this case can be realized as a plastic material.

Another example of an injection molded part is a plastic car body part provided with nut elements for mounting the hinges and for attachment to other car body parts.

The present invention includes a method for making sheet metal having at least one nut element attached thereto.

In a further development of this method, the sheet metal fitted with at least one nut element is removed from the punch rivet press and inserted into the injection molding die.
At this time, one end of the hole of the nut element is closed with a stamped slug and the other end surface of the nut element is brought into contact with the wall of the injection molding die or the protrusion is inserted from the other end side of this hole. To close the hole of the nut element so that the injection molding material does not enter the hole during injection molding. A nut pin is retained on the wall (or insert) of the die by applying a locating pin provided in the injection molding die to the slug. The bent rivet flange surrounds the locator pins and, at the same time, desirably cooperates with the locator pins to ensure centering of the sheet metal within the injection molding die.

The molded article and method of the present invention are as follows. First, one mode of a molded article is a panel having a through hole, a body portion attached to the panel, a screw hole penetrating the body portion, a screw hole that is coaxial with the screw hole, and is integrally provided in the body portion. A female fastener having an annular fastening portion that penetrates the through hole of the panel and is riveted to the panel, a disc-shaped slug that is fixed in the annular fastening portion and seals the through hole of the panel, and the panel. A molding material that at least partially surrounds the molding material, in which at least a part of the body portion of the female fastener is exposed and the annular fastening portion is enclosed. This first
In the aspect of the molded article, the disc-shaped slug is held in the annular retaining portion by a lip portion integral with the annular retaining portion. Further, the screw hole can be freely approached from the opposite side of the slug through the molding material, and the slug is detachably held in the annular retaining portion. Further, the molding material forms a sole of a sports shoe, and the female fastener holds a replaceable spike.

A second aspect of the molded article has a panel, a body portion, and an annular body portion extending from the body portion and having an opening, the body portion having a free open end portion and the body portion. An opening having a substantially coaxial through hole, the body having a punched end for punching a slag from the panel to form a hole having a periphery in the panel, the body and the periphery At least one fastener formed by deforming these so as to tighten each other, and a molding material at least partially surrounding the panel, exposing at least a part of a body portion of the fastener from the molding material. In addition, the annular retaining portion is concealed, and a slug that is fixed in the opening of the body portion and that prevents the molding material from flowing into the through hole of the body portion. Further, in this, the through hole of the body portion is formed with a female screw that can be approached from the free end. Also, the molding material forms a sole of a sports shoe, and the female fastener holds a replaceable spike. Further, the panel is corrugated or perforated spring steel. Further, the molding material forms the sole of a golf shoe. The molded article is a plastic container provided with a fastener for attaching one or more hinges. The slug has a diameter slightly larger than the inner diameter of the body so as to be wedged in the opening of the body. The body portion has an inner wall having an inwardly extending lip portion, the opening portion of the body portion has an inner diameter larger than the inner diameter of the hole of the body portion, and the body portion opening portion and the body portion An offset portion is formed between the flange and the hole, and the slug is located between the flange and the offset portion. Further, the slug is removably provided in the body. Furthermore, the slug is fixed within the body at a distance from the free open end. Furthermore, the slug is fixed in the body at a distance from the body. Still further, the fastener includes a shoulder portion that extends outward between the body portion and the body portion, the panel has two opposing surfaces, one of which is engaged by the shoulder portion, The deformed body is engaged with the surface of
Holding the panel between the shoulder and the deformed panel. The shoulder includes ribs that cooperate with a portion of the panel that is convexly deformed toward the fastener to prevent rotation of the fastener. In addition, the panel includes a recess in which the deformed body is located.

A first aspect of the method of the present invention comprises a body portion and a body portion extending therefrom with an opening, the body portion being substantially co-located with the free open end and the opening of the body portion. In a method of manufacturing a molded article having at least one fastener having an axial through hole and a sheet metal to which the fastener is attached, the fastener is provided with a free open end of the body facing the sheet metal. Disposed adjacent to the sheet metal, urging the free open end of the body against the sheet metal, punching the free open end of the body into the sheet metal to punch the sheet metal; Punching a slug from sheet metal, deforming the free open end of the body radially outward to mechanically couple with the sheet metal, wedge-fastening the slug in the body opening, Tometaru and surrounding the barrel portion in the molding material, the slag, the molded material comprising the step of preventing the flowing into the through hole of the body portion. In this,
A female screw is formed in the through hole of the body portion. The opening of the body has an inner diameter larger than the inner diameter of the through hole of the body, and an offset portion is formed between the opening of the body and the through hole of the body, An inwardly extending lip is formed to hold the slug between the lip and the offset. Further, the slug is removably secured within the barrel. Still further, the fastener includes a shoulder portion extending substantially between the body portion and the body portion, the shoulder portion including a rib, and a portion of the sheet metal adjacent to the rib protruding toward the fastener. And the rib portion cooperates with the rib portion to prevent rotation of the fastener. Further, the sheet metal is deformed to form a concave portion, and the body portion is formed into the concave portion. Transforms within.

A second aspect of the method of the present invention includes a body portion and a body portion extending therefrom having an opening, the body portion being substantially co-located with the free open end and the opening of the body portion. In a method of manufacturing a molded article having at least one fastener having an axial through hole, a panel to which the fastener is attached, and a molding material surrounding at least a part of the panel, a fastener having a body portion facing the panel is provided. In a press including a die button having an arcuate concave annular die cavity surface and a central protruding die portion provided in the other press space between opposing press spaces with at least one mounting head for receiving. The panel is introduced into the panel, the mounting head is moved in the direction of the panel, the panel is pressed to make a hole in the panel, and the slag is punched out from the panel. It is placed on the central protruding die, and the mounting head is continuously moved in the direction of the panel to press the body against the annular die cavity surface to deform radially outward so that the outward cross section is almost the same. A U-shaped groove is formed, and at the same time, an edge portion of the hole formed in the panel is pushed into the U-shaped groove to mechanically connect the U-shaped groove and the edge portion of the hole, and at the same time, The step of pushing the slag into the body to seal the body in the hole of the body. Then, the rod member is pressed against the slug through the body portion, the slug is pushed into the central protruding die portion to flatten the slug, and is wedge-bonded in the body portion. Further, the slag is plastically deformed into a curved surface facing the body portion, and the slug is wedge-bonded in the body portion. Further, the slag is deformed into an arch shape as it is pushed into the body. Furthermore, the rod member is pressed against the arched slug through the body portion to press the slug against the central protruding die portion, flattening the slug and wedge-bonding it in the body portion. Still further, the opening of the body portion is separated from the through hole of the body portion by a step portion, further comprising the step of forming a lip portion that extends inward from the inner wall of the body portion into the opening portion of the body portion, The slug is retained in the body between the lip and the step. Then, the plastically deformed body is flattened. Further, a screw is formed in the through hole of the body part. Further, the panel to which the fastener is attached is inserted into a molding die, the molding die is filled with a molding material, and at least a part of the panel, at least a part of the body portion, and the body portion are filled with the molding material. And prevents the molding material from flowing into the through hole of the body portion by the slag.
Finally, a guide pin is inserted into the barrel and applied to the slug to ensure that the slug is aligned with the panel.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a stamping head 10. This stamping head 10 is almost the same as German Patent 34th.
46978, in particular similar to the stamping head of DE 34 47 06, and can be manufactured in a stamping or embossing press having plates which are movably mounted relative to each other. Although FIG. 1 shows the stamping head manufactured in the upper press plate, it may be manufactured in the lower or middle plate.

The stamping head 10 is a ram unit 1
Including 2. This ram unit 12 has a fastener nut element 14 (with a punching rivet portion 16 which is a kind of fastener) on a panel 18 (herein shown as sheet metal, and the term "sheet metal" will be used hereinafter). Hereinafter, simply referred to as "nut element") can be stamped. This sheet metal 18
Is held between the stamping head 10 and the die button 20 during the stamping operation, as will be described in more detail below. The stamping head 10 includes a feeding device (not shown).
Is provided which can feed the individual nut elements 14 into the stamping head 10 and bring them into the working position of FIG. Such feeders are known and will not be described here. Although the nut element 14 appears to be suspended in the air in FIG. 1, it is frictionally held in the stamping head 10 by elastic fingers or the like so as not to fall by its own weight.

As is apparent from the cross section of the ram unit 12 shown on the left side of the center line 13 in FIG. 1, the nut element 14 has a body portion 15 formed with an internal thread 24 and a tubular portion adjacent to the body portion 15. Punching rivet part 16
Have and. The punched rivet portion 16 is connected to the body portion 15 via a ring-shaped shoulder portion 26 that faces outward in the radial direction. A rib (nose portion) 28 is provided on the ring-shaped shoulder portion 26 to reliably prevent rotation. The function of the rib 28 will be described later. The stamped rivet portion 16 of the nut element 14 has a ring-shaped recess or hole 29. The hole 29 is coaxial with the opening of the female screw 24, and the lower end thereof is rounded to form an impact / pull-out edge 32.

A die button 20 is provided on the side of the sheet metal 18 opposite to the stamping head 10. The die button 20 includes a cylindrical insert 30 which can also be named a press mandrel. In this embodiment, the insert 30 is replaceable in the receiving hole 31 of the die button 20 although it cannot be displaced. That is, 20 represents the actual die button and includes the insert 30. In some embodiments, die button 20 and insert 30 are a single piece. Which embodiment to use is ultimately determined by what the cost of a given adaptation will be. Insert 3 depending on the sheet metal material to be processed
0 is subject to wear, both large and small. Therefore, it makes sense to make the insert 30 a replaceable member when it is subject to significant wear.

Insert 30 facing sheet metal 18
The shaft end 33 has a smaller diameter than its body portion 34,
Together with the die button 20 surrounding the insert 30, a U-shaped ring-shaped groove (channel) 36 opening toward the sheet metal 18 is formed. The ring-shaped groove 36 is a semi-toroidal recess. The radially inner boundary of the groove 36 is formed by the arcuate ring-shaped shoulder 38 of the insert 30. This ring-shaped shoulder 38 then extends from the small diameter shaft end 32 to the ring-shaped edge 4 of the insert 30.
It is connected to the body part 34 through a continuous transition part in the shape of a gentle arc ending in 0. The die button 20 has a ring-shaped recess 42 which corresponds to the ring-shaped shoulder 38 and is substantially mirror-symmetrical thereto. However, the lowest position of the ring-shaped recess 42 of the die button 20, as shown in FIG. 1, is slightly below the lowest point 44 of the U-shaped ring-shaped shoulder 38 of the insert 30, or at the highest, the ring-shaped edge 40. Is consistent with

The ring-shaped recess 42 of the die button 20 extends beyond the actual end face 48 of the insert 30 in the embodiment of FIGS. 1 to 4 and through the arcuate ring-shaped shoulder 50 a shallow ring. It is connected to the area 52 of the shape. The die button 20 is connected to the wall portion 56 via another ring-shaped shoulder portion 54 having an arc shape. The wall 56 descends conically (FIGS. 1 to 5), is generally rounded at the line (ring edge) 40 and parallel to the sheet metal 18 via another ring shoulder 58. It is connected to the surface 60. This surface 60 then connects to the actual pressing surface of the tool used to form the underside of the sheet metal 18.

Therefore, the die button 20 has the insert 3
An annular protrusion 64 is formed around 0. As can be seen from the continuous centerline 13, the insert 30 has a nut element 1
4 and the ram unit 12 are coaxial.

The stamping head 10 has a circular recess 66.
Is provided. The concave portion 66 has a shape complementary to the outer side portion of the annular protruding portion 64 of the die button 20, but the diameter is increased by about twice the thickness of the sheet metal 18, and the press is closed. Occasionally, a space for the sheet metal 18 is created between the circular recess 66 and the annular protrusion 64. In other words, the recess 66 diverges downward and is continuous with the ring-shaped surface 72 parallel to the surface of the sheet metal 18 via the ring-shaped shoulder 60. This ring-shaped surface 72
Is a ring-shaped surface 6 at least when the press is closed.
Corresponding to 0, it is connected to the actual press surface of the tool.

The actual end surface 48 of the insert 30 has a central flat portion 74. The flat surface 74 is connected to an annular recessed shoulder 76 via a chamfer 75, which is beveled and preferably slightly arched. This shoulder 76
Joins the steep wall 78 of the ring-shaped shoulder 38 at the edge 80.

Further, it is apparent from FIG. 1 that the arc-shaped impact / pull-out edge 32 of the punching rivet portion 16 of the nut element 14 has a chamfered chamfer 82 on the inner side in the radial direction.
The chamfered surface 82 is inclined by about 45 ° with respect to the center line 13, and is connected to a cylindrical outer wall portion 86 parallel to the cylindrical inner wall portion of the punched rivet portion 16 via a gentle curve 84 at the radially outer portion. There is.

The cylindrical outer wall portion 86 is the punch rivet portion 1.
At approximately half the height of 6, there is a conical part 88 that diffuses upwards, which conical part 88 is connected to the ring-shaped shoulder 26 via an arcuate part. The inner cylindrical wall 90 of the nut element 14 has a larger diameter than the internal thread 24. As can be seen from FIG. 1, a punch insert (punch) 92 is fixed in the ram unit 12 and penetrates the internal thread 24 with a certain clearance. Alternatively, it is also possible, for example, to facilitate the insertion of each nut element 14 and subsequently to displace the punch insert 92 for technical reasons while the ram unit 12 is moving in the direction of the matrix insert. Is. In this embodiment,
The lower end of the punch insert 92 has a hexagonal shape, and is connected to a central surface 96 parallel to the sheet metal 18 via a slight ring-shaped chamfer 94. An annular R portion 98 is formed between the chamfered surface 94 and the outer wall of the punch insert 92.

The nut element 14 is inserted into the sheet metal 18 at the same time as the sheet metal 18 is formed in the press, as will be described below with reference to FIGS.

FIG. 1 shows an initial state after the sheet metal 18 is taken in and before the press is completely closed, that is, before the upper press plate presses the lower press plate. Just before the press closes, the nut element 14 is taken up by the feeding device under the ram unit 12 and placed in the position shown in FIG. The structure of the supply head is appropriately known from other documents, for example the above-mentioned documents, and will not be described further here.

The stamping head 10 is attached to the press plate so that the displacement is limited as usual. However, the ram unit 12 is connected to the press plate at least during the closing movement. During the closing movement of the press, the stamping head 10 descends in the direction of the die button 20, the ram unit 12 descends at the same time, and the impact / punching edge 32 of the punch rivet portion 16 of the nut element 14 is As shown in FIG. 2, the pressure of the ram unit 12 bites into the sheet metal 18. During this bite, the sheet metal 18 is held in the press so that it does not move laterally. In this state, the stamping head 10 retracts somewhat but the ram unit 12 does not retract while the closing motion of the press continues. Nut element 14
Together with the fixed end of the insert 30 the ram unit 1
The sheet metal 18 is sheared by the pressure of 2, and the slug 100 stamped in a circular shape is cut out from the sheet metal portion 18.

FIG. 2 shows exactly the position of the tool formed by stamping the slug 100. The stamped slug 100 has an arcuate shape with the central part facing upwards, which shape is due on the one hand to the shape of the end face of the insert 30 and, on the other hand, between the punch rivet part 16 and the insert 30. It is due to the shearing action. More precisely, this arched shape of the stamped slug 100 is formed by the action of the chamfered surface (cutting edge) 82 of the stamped rivet 16 and the axial end (cutting edge) 33 of the insert 30.

The sheet metal 18 is brought into contact with the ring-shaped region (ring-shaped surface) 52, and R at the transition portion from the conical wall 68 of the circular recess 66 to the horizontal ring upper surface 72.
When the sheet metal 18 is brought into contact with the sheet metal 18, it bites into the sheet metal 18. This bite continues as the press 10 further closes, as shown in FIG. Ram unit 12
Is also pressed further down by this movement and the nut element 1
The punching rivet portion 16 of No. 4 is driven through a hole formed by forming the slag 100 by stamping. The punched rivet 16 is deformed outwards by the ring-shaped shoulder 38, which acts as a rolling surface, and the now somewhat deformed impact-pull-out edge 32 enters into the ring-shaped groove 36 formed by the die button 20.

The lowest point 46 of the insert 30 is slightly higher than the lowest point 44 of the U-shaped ring shoulder 38 of the insert 30, so that the punch rivet portion 16 of the nut element 14 is acceptable even if tolerances are not desired. Impact / pull-out edge 32
There is no ring-shaped step at this position that would prevent the worm from moving outward.

Since the punching rivet portion 16 of the nut element 14 is punched through the hole formed in the sheet metal 18 by punching the slag 100, a wedge action occurs here, and the sheet metal 18 is pushed downward and outward. ,
As shown in FIG. 3, the sheet metal 18 leads to a well-defined conical recess 108. As the upper press plate is pressed further downward, the sheet metal 108 is formed with a prominent ring-shaped protrusion 110 above the region 52 of the die button 20. This ring-shaped protrusion 110
Force must be supplied from the stamping head 10 to form the.

As a result of the lowering of the stamping head 10,
The stamped slug 100 is driven into the hole defined by the cylindrical inner wall 90 of the punch rivet portion 16 of the nut element 14, but has not yet contacted the end surface of the punch insert 92.

The stamping head 10 or the upper press plate of the press continues to be lowered, and the upper press descends not only the ram unit 12 but also the ram unit 12 until reaching the final stage of FIG. Press. In particular, as can be seen from the cross section shown on the left side of FIG. 4, this results in a rivet flange 112 that is fully bent by the U-shaped groove 36 to form an upwardly facing U-shaped ring recess 114. In the ring-shaped recess 114, the portion (peripheral portion) of the sheet metal 18 around the hole after the stamping of the slug 100 is received in the form of a cylindrical collar 116. This part of the sheet metal 16 is connected via a ring-shaped shoulder 118 to a conical part 120 which extends downward. The conical portion 120 is a surface 60 of the die button 20 and a surface 7 of the stamping head 10.
Flat area 12 of sheet metal 16 determined by 2
Two in a row. When the nut element 14 is fully driven down, the rib 28 is pressed downwards and the nut element 14 is pushed down.
Recesses are formed in and are fitted into these recesses. This completely prevents rotation of the nut element 14 for later use.

The upwardly arched slug 100 shown in FIGS. 2 and 3 is initially pressed flat and pushed. That is, the slag 100 is compressed by the central surface 96, which is the end surface of the punch insert 92, and is pressed outward.
A punch insert 92 is provided displaceably with respect to the ram unit 12 and is biased forward, for example by a strong spring, to move somewhat rearward while the slug 100 is compressed. When the slug 100 is moved outward by the compression action, a permanent compression pressure is generated between the ring-shaped outer edge 124 of the stamped slug 100 and the driving rivet portion 16 of the nut element 14. Further, the punch rivet portion 16
Is the compression pressure, that is, the stamped slag 10
It is transformed into a surface that converges slightly downward by the compression of 0,
The stamped slag 100 is prevented from falling. Due to the compressive pressure, it is sealed very well. Therefore, the stamped slag 100
No longer falls and is lost. Further, the internal thread 24 has a diameter substantially smaller than that of the wall portion 124 of the punching rivet portion 16, and the outer edge of the slug 100 stamped on the wall portion 124 makes sealing contact, so that the slug 100 is pulled out and lost. There is nothing to be told. After the press is opened, the sheet metal 18 to which the punching rivet portion 16 is attached is removed from the press and carried out of the press.

In a first variant of the method according to the invention, the method for producing the sheet metal 18 with the inserted nut element 14 ends at this stage when the sheet metal 18 is removed from the press.

Although the above steps relate only to inserting one nut element, a plurality of nut elements can likewise be provided at various positions of the sheet metal with one stroke. Also, the sheet metal can be punched with the nut element in a manner different from that described above. For example,
The ram unit can be pressed downwards by a stroke movement which is carried out separately from the closing movement of the press.

Instead of ending the manufacturing by opening the press after the manufacturing stage of FIG. 4, it can be advantageous to carry out the manufacturing process shown in FIG. The manufacturing process of FIG. 5 is performed with a tool different from that shown in FIGS. Although this manufacturing process of FIG. 5 is performed in a completely different press machine, FIG.
Through can be performed as a separate step in another station of the same press machine used to perform the steps of FIG. That is, this press machine is provided for performing tooling in continuous steps.

FIG. 5 shows some possible method variants. This FIG. 5 shows that the slug 100 stamped in the nut element 14 can be mounted more reliably. Further, FIG. 5 shows the rivet flange 1.
Show that 12 can be pressed flat. This may be the case, for example, when the bent rivet flange 112 must be within the conical portion 120 of the sheet metal 18, or in another step the stamped slug 10.
It is important when 0 is not inserted in the position shown in FIG. 5 but is inserted in the ring-shaped space at the other end of the nut element 14.
In the latter case, the bolt associated with the nut element 14 must enter through the bent rivet flange 112,
This bolt normally presses another sheet metal against the bent rivet flange 112. In this case, since the rivet flange 112 is flat, the surface for transmitting the tightening force becomes large, and it is possible to avoid excessive surface pressure between the rivet flange 112 and the sheet metal 18 to be fixed, This excessive surface pressure eliminates the possibility of unnecessarily plastically deforming the sheet metal 14 and the rivet flange 112 and causing the setting effect.

In the embodiment shown in FIG. 5, the die button 20 is used.
Is a large annular protrusion 6 as seen in FIGS.
4 has a substantially flat surface 60. Alternatively, the surface of the die button 20 facing the sheet metal 18 may have a ring-shaped surface 130 that is continuous with the flat surface 60 via a small step 132. The ring-shaped surface 130 is the plane 60, that is,
It is parallel to the surface of the sheet metal 18 formed at the preceding station (which has undergone the steps according to FIGS. 1 to 4). The insert 30 is substantially cylindrical, with only the centerline 1
Undercut 1 with R ending in a flat surface 74 that is perpendicular to 3
Only 34 is attached.

Unlike the ram unit of the preceding station, the ram unit 12 of this embodiment does not have the central punch insert 92. The slag 10 cut out from the sheet metal 18 and arranged below the internal thread 24 in FIG.
0 is pushed upwards by the action of the insert 30 until its upper end abuts a ring-shaped shoulder 136 located directly below the internal thread 24 of the nut element 14.

The ring-shaped edge 138 of the insert 30 in the punching rivet portion 16 where the cylindrical surface 140 of the insert 30 is continuous with the R-shaped undercut 134 is
The diameter is larger than the inner diameter of the cylindrical inner wall (hole) 90, and when the nut element 14 is lowered by the action of the ram unit 12, it acts as a shearing / shaping tool. During this, an annular rim 142 is formed from the stamped rivet portion 16 of the nut element 14. As a result, the ring-shaped groove 144
Is formed by a ring-shaped shoulder 136, and this ring-shaped groove 1
A permanent compressive pressure is applied within 44 to hold it in a sealed condition.

Since the die button 20 has a flat ring-shaped surface 130 surrounding the insert 130, the R-shaped end surface of the nut element 14 around the punch rivet portion 16 obtained by the method shown in FIG. Becomes a ring-shaped surface 152.

In this embodiment, it is not necessary to provide the punch insert 92, but if it is useful to apply pressure to the upper surface of the slug 100 to secure the slug 100 as in the process of FIG. Alternatively, the punch insert may be selected and used.

To insert the slug 100 before inserting the nut element 14, ie, in the pre-processing stage, a punch insert in the form of insert 30 shown in FIG. It is also possible to punch from the metal 18. This method is advantageous, for example, when the sheet metal is relatively thick, for example 3-5 mm, where it is difficult to use self-punching nut elements (self-piercing nut elements). The relatively thick sheet metal 18 is pre-drilled with a special stamping tool or by a punching process, the nut element is inserted into this pre-drilled hole and then the sheet is pressed, for example by a pressing process. Be sure to rivet the metal 18.

When the stamped slug 100 is provided on the punch rivet portion 16, the diameter of the undercut 134 of the insert 30 before inserting the nut element 14 is set to be slightly larger than the diameter of the punch rivet portion 16 before deformation. , There is sufficient material to form the ring-shaped recess (annular rim) 42.

In the case of FIG. 5, this is slightly modified so that the nut element 14 has "another" at the end opposite the stamped rivet portion 16.
A tool that inserts the stamped slug 100 can be used. To this end, this opposite end of the nut element 14 is provided with a tubular projection similar to the stamped rivet portion 16, but slightly shorter. The matrix insert can be pressed from above to below, which causes the slug 100 to be pressed downwards from the tubular projection, forming a rim corresponding to the ring-shaped recess (annular rim) 42. This rim holds the slug 100 stationary at the opposite end of the nut element 14. Following the shaping of the nut element 14 in this manner, the punch insert (ram insert) 92 can be omitted, and the nut element 14 can be driven into the sheet metal 18 and riveted according to FIGS. 1 to 4. I can.
In the next step, the bent rivet flange 112 can be pressed and flattened according to FIG. This is done by making the nut element 14 from the bent rivet flange side.
This is highly desirable because the bolts that are screwed onto the sheet metal 18 press the sheet metal 18 against the flat end face of the rivet flange.

Using a stamp that is substantially the same shape as the insert 30 of FIG.
0 is a ring-shaped or annular groove 144 of the nut element 14.
It has the advantage that it fits tightly in and does not get lost in any case. The absence of this loss means that the nut element 1
4 is very important if the slag is already installed at the manufacturing stage. The frequent loss of the pre-inserted slug 100 from the nut element 14 is highly undesirable as it has a catastrophic effect on the subsequent steps of the nut element 14. For example, if the slug 100 is lost when the nut element 14 is inserted into the press, the slug 100 may damage the sheet metal 18 or the tool. If the slag 100 is lost from the sheet metal 18 in the next step, the injection molding material may get into the internal thread 24 and the product must be discarded, or the injection molding material flows out through the internal thread 24 and is injection molded. The product may be contaminated or damaged.

Nut element 1 with slug 100 pre-inserted
00, the slug 100 can be manufactured by stamping from a member thinner than the sheet metal 18 to which the nut element 100 is attached.

FIG. 6 shows an example in which the present invention is applied to the bottom (shoe bottom) 200 of sports shoes such as golf shoes. The shoe sole 200 has a plastic portion 201 such as a plastic portion or a rubber portion and a spike 202. As shown in FIG. 7, the shoe sole 200 has a sheet metal 1
8 is embedded in which a nut element 14 is attached by the method of FIGS. Each nut element 1
Reference numeral 4 constitutes a threaded mounting for the spike 202, to which the spike 202 is screwed and fixed. Unlike the previously described embodiment, this embodiment does not have a large recess in the portion of the sheet metal 18 in the region of each nut element 14. For this reason, it is necessary to change the shapes of the upper side and the lower side of the stamping head to some extent.

A method of embedding the sheet metal 18 with the nut element 14 in the plastic portion 201 of the shoe sole 200 is shown in FIG.

FIG. 8 shows in cross section only a portion of the injection molding die. This injection molding die has an upper die 300 and a lower die 302 that meet at a partition surface 304. The dies 300 and 302 have recesses (cavities) 306 and 308, respectively. Nut element 14
The sheet metal 18 (shown in part) with
It is supported within the recess of the injection molding die, for example on a pin indicated at 310. In this example, pin 310
Are arranged under the corresponding slug 100. In this embodiment, the bent rivet flange (rim) 11
2 serves the dual function of cooperating with the pin 310 and centering the sheet metal 18 in the injection molding die. However, other centering devices may be provided if desired. Above the nut element 14 is another die insert in the shape of a pin 312, the cylindrical head 314 of this die insert abutting the upper surface 316 of the nut element 14. The diameter of the cylindrical head 314 depends on the nut element 1
4 is larger than the inner diameter of the female thread of the nut portion, but smaller than the outer diameter of the nut portion of the nut element 14. The slug 100 is somewhat elastic so that the two dies 300 and 302 on the top and bottom of the injection molding die can be completely closed even if the tolerance of the pins 310 and 312 is not desired.
After the injection molding die is closed, the injection molding material is injected into the die. This injection-molded material flows into the recesses 306 and 308 in the injection-molding die, that is, the areas indicated by cross-hatching in FIG. Injection molding material is nut element 1
It also arrives at the end of the nut portion 4 opposite to the sheet metal 18. In this structure, on the one hand, it is difficult for moisture to enter around the nut portion of the nut element 14, and on the other hand, the shoe sole 200
7, the male screw of the spike 202 is screwed into the female screw of the nut element 14 so that the collar portion 204 is an injection molded material and the spike 202 of the spike 202 is located above the upper end surface of the nut portion of the nut element 14 in the drawing. This has the advantage of pressing and compressing the portion surrounding the male screw. This not only provides a better seal, but also prevents rotation and loss of spike 202.

Regarding the method for manufacturing the sole of a golf shoe,
Once again, I will briefly explain. In the sole of the golf shoe, the sheet metal 18 is made of highly flexible 0.3 mm spring steel. At the same time when the nut element 14 is inserted into the press, the sheet metal 18 is deformed into a corrugated shape (sine corrugation) corresponding to the shape of the press plate. The waveform of the formed sheet metal 14 has an amplitude (a distance between the upper surface and the lower surface) of about 3 mm and a wavelength (a length of one wave) of about 8 mm. Due to this shape, the spring steel sole 200 has a high elasticity. At the same time, the sheet metal 18 is stamped in the press so that the outer circumference of the sheet metal 18 fits the foot mold.

To receive the male threaded spikes 202, the nut element 14 embedded in the plastic part 201 of the sole 200 is such that the sole 200 withstands the stress from the ground trying to deform it. , Sheet metal 1
Must be fixed at 8.

In the conventional case, there is a sliding movement between the nut element and the shoe sole where they are connected. However, in this embodiment, the bent rivet flange 11
Since 2 prevents rotation of the nut element 14, such sliding does not occur and the notch effect does not occur in the sheet metal 18 in the sole 200. Where the nut element 14
The sheet metal 18 to which is attached is embedded in the plastic portion 201 of the shoe sole 200 to form the shoe sole 200. Therefore, when the slug 100 is inserted on the sheet metal 18 side of the nut element 14, the opening of the sheet metal 1 of the female thread is closed so that the flexible portion 201 of plastic or rubber does not enter the female thread of the nut element 14. .

The other end of the nut element 14 has a pin 31 shown in FIG.
It is closed by a tool such as 2.

In order to seal the entrance of the female screw of the nut element 14, the sheet metal 18 is not punched in advance and the punch rivet portion 16 of the nut element 14 is inserted therethrough, but is self punched. The punched slag 100 is held in the bent rivet flange 310 by the pin 310 that is a punch insert, and functions as a sealing cover that prevents the injection molding material from entering the internal thread.

The mounting method of this embodiment is summarized as follows. (A) Provide the same number of concave receiving portions as the nut elements in the lower press member having a shape corresponding to the shoe sole. (B) Just above the recess of the press for receiving the nut element in the upper press, stamping die buttons for stamping and bending the punching rivet portion of the nut element are provided in the same number as the nut element. (C) A nut element, such as a Profile's RSF Nut ™, is installed with its stamping rivet facing upwards into each recessed receiving portion in the lower press member by suitable feeding means. (D) A sheet panel which is not flat with holes for inserting nut elements and is made flat in advance is held in a molded fitting state according to the shape of the receiving portion of the press. (E) Confirm that the nut element and the sheet metal are installed at the installation position by an appropriate inspection means. (F) When the upper press passes the lower dead center, the nut element is cut into the sheet metal by the punching action. Forming a circular ring-shaped bent rivet flange that holds the slug punched with a relatively high clamping action (arch effect) as a cover in the punched rivet part and that closes the rear hole of the nut element To remove the riveted sole from which the nut element was stamped and then the assembly process was completed, and the assembled nut element-
The sheet metal assembly is installed in an injection molding die and embedded in an injection molding material such as plastic or rubber. (G) After that, the spikes are screwed to make a shoe sole, and the shoe sole and the upper side of the shoe are put together to form a finished product.

The cross section of the nut element does not necessarily have to be circular, but may be polygonal, for example. Further, it is not always necessary to form a screw on the nut, for example,
Bayonet mounting may be provided. The nut element should generally be considered a hollow fastener.

[0071]

According to the present invention, the through hole formed in the nut element is completely sealed by sealing the slug at one end and the wall surface in the injection molding die at the other end. Since the injection-molded material is formed on the sheet metal with the nut in a stopped state, the shirt-molded material never flows into the through hole during the injection molding, so that the quality of the molded product can be reliably ensured. Further, since the slag is firmly held in the through hole of the nut element, there is an effect that the slag is not lost.

[Brief description of drawings]

1 shows a partial cross section through a stamping head in the early stages of a method for mounting nut element sheet metal by stamping and riveting.

FIG. 2 is a partial cross-sectional view of the next stage of the punching and riveting method.

FIG. 3 is a partial cross-sectional view of still another stage of the punching and riveting method.

FIG. 4 is a partial cross-sectional view of the final stage of the punching and riveting method.

5 is a partial cross-sectional view at a stage corresponding to FIG. 4 in a modification of the punching and riveting method.

FIG. 6 is a rear perspective view of the sports shoe with spikes.

7 is a cross-sectional view taken along the line 7-7 of FIG.

8 is a cross-sectional view showing a step of manufacturing a shoe sole shown in FIGS. 6 and 7 by pouring an injection molding material around a nut element and a sheet metal to which the nut element is attached in an injection molding die to form a flexible portion. is there.

[Explanation of symbols]

 10 stamping head 12 ram unit 14 nut element 15 body part 16 punching rivet part 18 sheet metal 20 die button 29 center recess (hole) 30 insert 32 impact / pull-out edge 36 ring-shaped groove 64 annular protrusion 66 recess 92 punch insert 100 slug 112 Rivet Flange 114 Ring-shaped Recess 116 Cylindrical Collar 118 Ring-shaped Shoulder 120 Conical Part 130 Ring Receiving Surface 132 Steps 144 Ring-shaped Groove 200 Sole 201 Plastic Part 202 Spike 300 Upper Die 302 Lower Die 306 Recess (cavity) 308 Recess (cavity) 310 Pin 312 Pin 314 Cylindrical head

Claims (35)

[Claims] 1. A panel having (a) a through hole, and (b)
A body portion attached to the panel, a screw hole penetrating the body portion, and an annular retainer that is provided coaxially with the screw hole and integrally with the body portion and that penetrates the through hole of the panel and is riveted to the panel. A female fastener having a section,
(C) A disc-shaped slug fixed in the annular retaining portion and sealing the through hole of the panel, and (d) a molding material that at least partially surrounds the panel, the molding material being used as the female member. A molded article comprising at least a part of the body portion of the fastener exposed and the annular retaining portion enclosed. 2. The molded product according to claim 1, wherein the disc-shaped slug is held in the annular retaining portion by a lip portion integral with the annular retaining portion. 3. The screw hole is freely accessible from the opposite side of the slug through the molding and the slug is removably retained in an annular clasp.
The molded product described in. 4. The molded article according to claim 1, wherein the molded material forms a sole of a sports shoe, and the female fastener holds a replaceable spike. 5. A panel (a), (b) a body portion, and an annular body portion extending from the body portion and having an opening,
The body portion has a free open end and a substantially coaxial through hole in the opening of the body portion, and the body portion punches a slag from the panel to form a hole having a peripheral edge in the panel. At least one fastener having a punched end that deforms the body and the peripheral edge so as to tighten them, and (c) a molding material that at least partially surrounds the panel, One in which at least a part of the body portion of the fastener is exposed and the annular retaining portion is hidden from the molding material, and (d) is fixed in the opening of the body portion,
A molded product comprising a slag for preventing the molding material from flowing into the through hole of the body portion. 6. The molded product according to claim 5, wherein the through hole of the body portion is formed with a female screw that can be accessed from the free end. 7. The molded article according to claim 5, wherein the molded material forms a sole of a sports shoe, and the female fastener holds a replaceable spike. 8. The molded product according to claim 5, wherein the panel is a corrugated spring steel material. 9. The molded product according to claim 5, wherein the panel is a perforated spring steel material. 10. The molded product according to claim 5, wherein the molded material forms a sole of a golf shoe. 11. The molded product according to claim 5, wherein the molded product is a plastic container provided with a fastener for attaching one or more hinges. 12. The molded product according to claim 5, wherein the slug is formed to have a diameter slightly larger than an inner diameter of the body so as to be wedged in the opening of the body. 13. The body has an inner wall having an inwardly extending lip portion, and the opening of the body has an inner diameter larger than an inner diameter of a hole of the body, and the opening of the body is The molded product according to claim 5, wherein an offset portion is formed between the body portion and the hole, and the slag is located between the flange and the offset portion. 14. The molded article according to claim 5, wherein the slag is removably provided in the body. 15. The molded article of claim 5, wherein the slug is secured within the barrel at a distance from the free open end. 16. The molded article according to claim 5, wherein the slag is fixed in the body portion at a distance from the body portion. 17. The fastener includes a shoulder portion extending outwardly between the body portion and the body portion, the panel having two opposite surfaces, one of which is engaged by the shoulder portion. ,
The molded article according to claim 5, wherein a deformed body portion is engaged with the other surface to hold the panel between the shoulder portion and the deformed panel. 18. The molded article according to claim 17, wherein the shoulder includes ribs that cooperate with a portion of the panel that is convexly deformed toward the fastener to prevent rotation of the fastener. 19. The molded product according to claim 5, wherein the panel includes a recess in which the deformed body is located. 20. At least one body having a body portion and a body portion extending therefrom and having an opening, the body portion having a free open end and a through hole substantially coaxial with the opening portion of the body portion. And a method of manufacturing a molded article having a sheet metal to which the fastener is attached, wherein (a) the fastener is arranged adjacent to the sheet metal with the free open end of the body facing the sheet metal. Then
(B) The free open end of the body is urged against the sheet metal, and (c) the free open end of the body is driven into the sheet metal to punch out the sheet metal. Punching the slag from (d) mechanically connecting the sheet metal to the sheet metal by radially deforming the free open end of the body, and (e) wedge-fastening the slug in the opening of the body. (F) A method of manufacturing a molded part, which comprises a step of surrounding the sheet metal and the body with a molding material, and preventing the slag from flowing into the through hole of the body portion. 21. The method for producing a molded product according to claim 20, wherein a female screw is formed in the through hole of the body portion. 22. The opening of the body has an inner diameter larger than the inner diameter of the through hole of the body, and an offset portion is formed between the opening of the body and the through hole of the body, 21. The method of manufacturing a molded part according to claim 20, wherein an inwardly extending lip is formed in the body portion, and the slug is held between the lip portion and the offset portion. 23. The method of making a molded part according to claim 22, wherein the slug is removably secured within the barrel. 24. The fastener includes a shoulder extending substantially between the body and the body, the shoulder including a rib, and a portion of the sheet metal adjacent to the rib facing the fastener. 21. The method for producing a molded product according to claim 20, wherein the convexly deformed portion is formed as a convex shape, and the convexly deformed portion and the rib portion cooperate to prevent rotation of the fastener. 25. The method for manufacturing a molded article according to claim 20, wherein the sheet metal is deformed to form a recess, and the body is deformed in the recess. 26. At least one body having a body portion and a body portion extending therefrom and having an opening, the body portion having a free open end and a through hole substantially coaxial with the opening portion of the body portion. Of the fastener, a panel to which the fastener is attached, and a molded product surrounding at least a part of the panel, and (a) at least 1 for receiving the fastener with the body portion facing the panel. Introducing said panel into a press containing an arched concave annular die cavity surface and a die button with a central protruding die section located in the other press space between opposite press spaces with one mounting head on one side And (b) moving the mounting head in the direction of the panel to press the panel to make a hole in the panel and punch a slug from the panel to project the slug to the center. (C) The mounting head is continuously moved in the direction of the panel to press the body against the annular die cavity surface to deform it radially outward so that the outward cross section is almost the same. No U-shaped groove,
(D) At the same time, the edge of the hole formed in the panel is pushed into the U-shaped groove to mechanically connect the U-shaped groove and the edge of the hole, and (e) At the same time, A method of manufacturing a molded article, comprising the step of pushing slag into the body to seal the body with respect to a hole in the body. 27. The method according to claim 26, further comprising a step of pressing a bar member against the slug through the body portion, pushing the slug into a central protruding die portion to flatten the slug, and wedge-bonding the slug into the body portion. The method for producing a molded article according to 1. 28. The method for producing a molded article according to claim 27, further comprising the step of plastically deforming the slag into a curved surface facing the body portion and wedge-bonding the slag into the body portion. 29. The method for manufacturing a molded article according to claim 26, wherein the slag is deformed into an arch shape as being pushed into the body. 30. A step of pressing a bar member against the arched slug through the body portion to press the slug against the central protruding die portion, flattening the slug, and wedge-bonding the slug in the body portion. 30. The method further comprising:
The method for producing a molded article according to 1. 31. The method further comprising the step of separating the opening of the body from the through hole of the body by a step and forming a lip portion extending inward from the inner wall of the body into the opening of the body. 27. The slug includes and is retained within the body between the lip and the step.
The method for producing a molded article according to 1. 32. The method for producing a molded article according to claim 26, further comprising the step of flattening the plastically deformed body. 33. The method of manufacturing a molded article according to claim 26, wherein a screw is formed in the through hole of the body portion. 34. The panel to which the fastener is attached is inserted into a molding die, the molding die is filled with a molding material, and the molding material fills at least a part of the panel and at least a part of the body portion. 27. The method of manufacturing a molded product according to claim 26, further comprising a step of surrounding the body portion and preventing the molding material from flowing into the through hole of the body portion by the slag. 35. The method of manufacturing a molded article according to claim 34, further comprising the step of inserting a guide pin into the body and applying the guide pin to the slug to ensure that the slug is aligned with the panel.