JPH0324249Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a cam-type molding die, and is designed to make it possible to keep the amount of cam pushing into the workpiece constant without being affected by the set height of the die. Regarding improvement of molding molds.

[Background technology and its problems]

A cam-type molding die is known in which a cam driver is lowered together with the upper mold, and the cam slid by the cam driver is pushed into the workpiece attached to the lower mold to perform the molding process. ) is widely used to form vertical grooves or notches on the outer walls of buildings.

A conventional cam type molding die has a structure as shown in FIGS. 4 and 5. That is, in the case of the cam method shown in FIG.
A cam slider 81 having a cam slider 81 is slidably mounted on a slide guide member 91. The cam slider 81 also has a screw member 9 provided on the locking piece 92.
The position of the locking piece 92 is constantly regulated by a backup means 94 consisting of a spring 95 and a locking piece 92. On the other hand, the upper mold 40 had a structure in which a cam driver 80 having a tapered tip was fixed.
Therefore, when the upper mold 40 is lowered toward the lower mold 50, the cam driver 80 is inserted between the locking piece 92 and the cam slider 81. The cam slider 81 is moved toward the right in the figure against the biasing force of the spring 95.
The cam 90 is pushed into the workpiece, and a vertical groove or the like corresponding to the shape of the cam 90 is formed in the workpiece. However, in this structure, although the position of the cam driver 80 is restricted by coming into contact with the cam stopper 93 of the locking piece 92,
0. Unless the set position in the vertical direction of a die (not shown) is particularly accurate, the displacement amount of the cam slider 81 will not be constant. For this reason, there was a problem that high-precision molding could not be performed. Furthermore, in the case of the mold shown in FIG. 4, if the cam driver 80 comes into contact with the cam stopper 93, excessive pressure will be generated between the upper mold 40 and the lower mold 50, damaging the cam driver 80 and the processed product. There were also fatal flaws such as:

Therefore, in order to keep the amount of displacement of the cam slider 81 constant even if the set position of the lower mold 50 varies, a structure shown in FIG. 5 has been proposed. According to this, a slide guide member 91 is provided on the lower die 50 provided with the escape hole 62, and a cam slider 81 having a curved hole 97 is provided on the slide guide member 81 so as to be freely slidable. On the other hand, the cam driver 80 is fixed to the upper die 40. Therefore,
If the cam driver 80 is inserted into the bent hole 97 of the cam slider 81, the amount of displacement of the cam slider 81 can be made constant depending on the shape of the straight portion 98. However, in this structure, the upper die 40
As the cam slider 81 lowers, the tapered bent portion 88 of the cam slider 81 and the tapered bent portion 89 of the cam driver 80
will pass through a line contact state where they are in contact with each other.
In other words, the contact changes from surface contact to line contact. For this reason, there was a problem that it was unsuitable for machining with a large forming load or high-precision machining of splines, gears, etc., and could not be adopted.

[Purpose of the invention] This invention eliminates the above problems, makes it possible to keep the cam pushing amount constant regardless of the setting position of the lower die, and makes it easy to handle and avoids overloading. The purpose is to provide a highly accurate cam type molding die.

[Means and actions for solving problems]

This invention is a cam-type molding die in which a cam driver is lowered together with the upper die, and the cam slid by the cam driver is pushed into the workpiece attached to the lower die. A stopper integrated with the cam driver for regulating the position of the upper mold with respect to the lower mold is attached to the cam driver, and when an overload is applied to the stopper, the upper mold and the stopper are relatively displaced to prevent the cam from moving. This object is achieved by providing a buffer device for regulating the amount of pushing into the workpiece.

The cam-type molding die configured as described above operates as follows.

A cam driver for moving a cam slider having a cam on the tip side, and a stopper for regulating displacement of the upper mold with respect to the lower mold are attached to the upper mold so as to be immovable relative to each other. Therefore, when the upper die is lowered and the cam slider is moved via the cam driver, the stopper restricts the position of the upper die relative to the lower die.

As a result, the amount of displacement of the cam remains constant regardless of the set position of the lower die, ensuring high-precision molding.

Furthermore, when the stopper comes into contact with the lower die and an excessive load is to be generated on the upper die and the lower die, a shock absorbing device is provided that allows the stopper to move relative to the upper die so that the stopper can escape from the upper die. Therefore, high-precision molding can be performed without damaging the mold or the workpiece.

〔Example〕

Examples of the cam-type molding die according to this invention will be described in detail with reference to the drawings.

(First Embodiment) This first embodiment is shown in FIG. The molding die 10 includes an upper mold 40 consisting of an upper mold holder 41, a cylindrical member 42, a product holding member 46, and a cylindrical body 4.
and a die 51 (upper die 5
2, a lower die 58), a lower die punch 65, a first holder member 70, a second holder member 72, and a die set 73. Note that the cylindrical member 42 of the upper die 40 and the cylindrical body 4
These also serve as elements constituting the shock absorber 1 described later.

The upper mold holder 41 of the upper mold 40 can be raised and lowered at any time by a lifting means (not shown). A cylindrical member 42 having a large diameter hole 45, a medium diameter hole 43, and a small diameter hole 44 is fixed to the upper mold holder 41. The cylindrical member 42 has an inner tapered portion 20
A cylindrical body 4 having a hole 18 with a partially reduced diameter and an outer tapered part 19 is slidably fitted, and the outer tapered part 19 causes the cylindrical body 4 to fall downward. It is made to stay in place.

Further, a stopper 5 having a through hole 78 is integrally provided on the lower end side 36 of the cylinder 4, so that the position of the upper mold 40 with respect to the lower mold 50 is regulated. This position regulation is to keep the amount of pushing of the cam 90 provided at the tip of the cam slider 81 against the workpiece 100 (see FIG. 3) constant, so the cam driver 80 that slides the cam slider 81 is is integrally fixed with. Further, the product holding member 46 is inserted into the holes 18 and 78 of the cylinder body 4 and the stopper 5, and is supported by the collar part 49 and the inner tapered part 20 of the cylinder body 4 so as not to fall.

On the other hand, the lower mold 50 is formed by stacking a die set 73, a second holder member 72, a first holder 70, a lower die 58, and an upper die 52 in this order, thereby forming an integral unit. The upper end surface of the upper die 52 is used as a barrel attachment surface 53 with the stopper 5, and the workpiece 10
Stepped hole 54 and cam driver 8 for holding 0
0 through holes 55 are provided. Lower die 58
has a through hole 59 into which the workpiece 100 is inserted and a slide guide surface 6 which guides the cam slider 81.
1 and a relief hole 62 for letting the tip of the cam driver 80 escape. Workpiece 10
The lower die punch 65 for inserting into the holder 0 and regulating its position is regulated vertically by pressing its flange 66 with the step 71 of the first holder member 70, and the flange 66 and the first holder 70 are integrated by a pin 150 for regulating the direction of rotation. Note that the knockout sleeve 86 and the knockout pin 87 fitted on the lower die punch 65 are used to project the processed product from the lower die 50 after molding.

By the way, the cam slider 81 is connected to the lower die 58.
The cam driver 80 is always biased in the radial direction by a spring 83, and when the cam driver 80 is not in the tapered portion 151, it is moved in the direction of the spring 83, and the workpiece 1
00 into and out of the lower die 58. Therefore, by lowering the cam driver 80, the cam slider 81 moves its tapered portion 15.
1 into the workpiece 100.

The shock absorber 1 includes a guide shaft 2 fixed to an upper mold holder 41, a piston body 3 guided by the guide shaft 2, a cylinder 4 to which the cylindrical member 42 and the stopper 5 are integrally fixed, and pressure adjustment means. It consists of 7 mag.

A seal ring 13 is provided on the outer peripheral edge of the flange portion 12 of the guide shaft 2, and a seal ring 13 is provided on the shaft portion 11.
The piston body 3 is slidably fitted with the piston 5 interposed therebetween.

Here, a damper room 6 is formed from a space surrounded by the flange portion 12 of the guide shaft 2, the shaft portion 11, the piston body 3, and the inner wall surface of the large diameter hole 45 of the cylindrical member 42. The damper room 6 has seal rings 13, 15,
16 makes it a sealed type, and communicates with the oil chamber 28 of the pressure regulating means 7 only through the piping 9. The pressure adjusting means 7 is formed from a cylinder 25, a piston 26, an air chamber 27 to which air at a constant pressure is supplied via a pipe 8, and an oil chamber 28. Note that 29 and 30 are seal rings.

Therefore, when the oil pressure in the damper room 6 increases, the piston 26 moves to the right in the figure against the air pressure in the air chamber 27. For this reason, the internal volume of the damper room 6 can be reduced, and as a result, the cylinder body 4 integral with the piston body 3, the stopper 5 and the upper die holder 41,
The cylindrical member 42 can be displaced relative to the cylindrical member 42 in the vertical direction in the figure.

Next, the operation of this first embodiment will be explained.

First, when the upper die holder 41 is in the upper position, the workpiece 100 is placed between the upper die 52 and the lower die punch 65.
Set to . In this case, the internal volume and pressure of the damper room 6 are a predetermined reference volume and pressure.

Next, the upper mold holder 41 is lowered downward in FIG. 1 according to a predetermined procedure. In this case, the product holding member 46 presses the workpiece 100 against the stepped hole 54 of the upper die 52 with a constant pressure by the spring 76. Since the cylindrical member 42, the cylinder 4, and the stopper 5 descend synchronously with the upper die holder 41, the cam 90 provided at the tip of the cam slider 81 is machined while the tip of the cam driver 80 is in contact with the tapered surface of the cam slider 81. It can be pushed into the object 100. After that, the end surface of the stopper 5 is connected to the barrel attaching surface 5 of the upper die 52.
3, the lowering movement of the upper mold holder 41 stops at the same time. Therefore, since the amount of pushing of the cam 90 into the workpiece 100 is constant, a groove 101 of a predetermined shape is formed on the outer peripheral surface as shown in FIG. Note that the tip of the cam driver 80 is connected to the lower die 5.
There is no problem because it escapes to the escape hole 62 of No.8.

By the way, if the set positions of the cam driver 80 of the upper mold 40 and the stopper 5, that is, the die height are small, the load will increase if the upper mold holder 41 continues to descend even when the stopper 5 contacts the barrel mounting surface 53 of the upper die 52. There is a risk that one of the molding molds 10 will be damaged. This is where the shock absorber 1 comes into play. When the stopper 5 contacts the barrel mounting surface 53 and the upper mold holder 41 continues to descend thereafter, the integral stopper 5, cylinder body 4, and piston body 3 will receive an excessive reaction force from the lower mold 50. . In this case, the oil pressure in the damper room 6 becomes high, and the oil pressure in the oil chamber 28 of the pressure adjustment means 7 is increased through the pipe 9. The piston 26 resists the biasing force of the air chamber 27 and is displaced to the right in the figure. Therefore, damper room 6
The piston body 3, the cylinder body 4, and the stopper 5 move relative to the cylindrical member 42 by the amount that the internal volume of the guide shaft 2 decreases (the height of the guide shaft 2 in the axial direction can become smaller in the figure). In this way, even if the set position of the upper die 40 is low, the shock absorber 1 can alleviate the excessive load on the lower die 50 and the like due to the lower setting position.

According to this first embodiment, the lower mold 50 is attached to the upper mold 40.
Since the stopper 5 is provided integrally with the cam driver 80 for regulating the position of the upper die 40 relative to the workpiece 100, the amount of feed of the cam slider 81 relative to the workpiece 100, that is, the amount of pushing of the cam 90, is constant, resulting in uniform and high quality. can be molded into products. In addition, if an overload is applied to the stopper 5 due to an improper setting of the height of the stopper 5 of the upper die 40, a shock absorber 1 is provided to cause relative displacement between the upper die 40 and the stopper 5, resulting in damage to the component equipment. Since the pushing amount of the cam 90 can be kept constant without causing such problems, high quality products can be reliably molded from this point of view as well.

Further, since the stopper 5 and the shock absorber 1 are integrally provided with the upper die 40, the structure is simple and reliable operation can be ensured.

Further, the shock absorbing device 1 is of a hydraulic type, and its pressure adjusting means 7 can be adapted to a wide range of overloads by changing the pressure supplied from the pipe 8, so that its applicability can be expanded.

(Second Embodiment) A second embodiment is shown in FIG. In this second embodiment, the shock absorber 1 is of a spring type, whereas the first embodiment is of a hydraulic type.

Therefore, description of the same parts as in the first embodiment will be omitted.

The upper mold holder 41 is integrally provided with a shaft member 31, and the space formed by the upper mold holder 41, the cylindrical member 42, and the cylindrical body 4 is provided with spring receivers 32 and 33 on the upper and lower sides.
A disc spring 34 is inserted through the disc spring 34. A spring-type shock absorber 1 is formed here. Therefore, when the stopper 5 comes into contact with the barrel attachment surface 53 of the upper die 52 of the lower die 50, the workpiece 100 of the cam 90 is
The amount of pushing into is constant. Furthermore, when the upper mold 40 is set at a high position, the stopper 5 integrated with the cam driver 80 and the upper mold holder 41 via the cylindrical member 42 are displaced relative to each other against the biasing force of the disc spring 34, so that excessive load is prevented. It is absorbed and does not cause equipment damage, etc.
And high-quality processing is possible.

According to this embodiment, the shock absorber 1 can have a simpler structure than the first embodiment.

According to the above embodiment, it is sufficient that the position of the upper die relative to the lower die can be regulated and the cam driver and the upper die (upper die holder) can be relatively displaced.
The structure of the stopper etc. can be arbitrarily selected, and the shock absorber is not limited to a hydraulic type or a spring type.

[Effect of idea]

As described above, with this invention, even if there is a defect or fluctuation in the set position of the lower mold relative to the upper mold, the amount of cam pushing is regulated to a predetermined value, and this state can be maintained regardless of overload, so it is uniform and high. It has the excellent effect of molding high-quality products.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a cam-type molding die according to the present invention, FIG. 2 is a sectional view similarly showing a second embodiment, and FIG.
External view of the product molded using the molding die of the example,
Figure 4 is a conventional cam-type molding die, and is a partial cross-sectional view of the first mold in which the amount of cam depression varies, and Figure 5 is a conventional cam-type molding die, with the cam FIG. 4 is a partial cross-sectional view of a second mold that can keep the pushing amount constant but is unsuitable for large loads. DESCRIPTION OF SYMBOLS 1... Shocking device, 4... Cylindrical body, 5... Stopper, 7... Pressure adjustment means, 10... Molding die, 4
0... Upper die, 50... Lower die, 80... Cam driver, 81... Cam slider, 90... Cam, 10
0...Processing object.

Claims (1)

[Claims for Utility Model Registration] (1) A cam-type molding tool in which a cam driver is lowered together with an upper mold, and the cam slid by the cam driver is pushed into a workpiece attached to a lower mold to perform molding. In the mold, a stopper is provided on the upper mold side integrally with the cam driver and for regulating the position of the upper mold with respect to the lower mold, and a stopper is fixed to the upper mold holder, and the stopper and the cam driver are fixed to the upper mold holder. A cylindrical member that is movable up and down, the stopper and the cam driver are biased downward against the cylindrical member, and when an overload is applied to the stopper, the cylindrical member, the stopper, and the cam driver are relatively displaced. 1. A cam-type molding die, characterized in that the cam-type molding die is equipped with a shock absorber for regulating the amount of pushing of the cam into the workpiece. (2) In claim 1 of the utility model registration claim, the shock absorber forms a guide shaft provided in the cylindrical member and a damper room slidably fitted onto the guide shaft. a cylindrical body which is capable of sliding on the inner wall surface of the cylindrical member, whose upper end side can come into contact with the piston body, and whose lower end side is attached with the stopper and cam driver; and a damper room. A cam-type molding die characterized by comprising: a pressure adjustment means for adjusting internal hydraulic pressure to a constant pressure. (3) In claim 1 of the utility model registration claim, the shock absorber is slidable on a spring provided in the cylindrical member and on an inner wall surface of the cylindrical member, and the upper end side is in contact with the spring. 1. A cam-type molding die comprising: a cylindrical body having a stopper and a cam driver attached to the lower end thereof;