JPH02247021A - Bead forming method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of forming a bead of a thin plate, which is used to reinforce, for example, a paper feed guide plate of a copying machine.

(Prior art) In general, methods for reinforcing thin plate members include forming reinforcing ribs by bending during press processing of the thin plate, and forming string-like protrusions, or beads, by drawing. . Not only is the thin plate member reinforced by the formation of beads, but the product value can be improved by appropriately devising the shape of the bead. It is widely used in the manufacture of paper feed guide plates for copying machines, facsimile machines, printers, etc.

As a conventional method for forming beads of this type, for example, No. 9
Some use press molds as shown in Figures (a) and (b). In FIG. 9(a), numerals 1 and 2 are the upper mold and lower mold of the press mold 3, the male mold 1a is formed in the upper mold l, and the male mold 1a of the upper mold 1 is formed in the lower mold 2. A female mold 2a into which the male mold 1a is inserted is formed opposite to the female mold 2a. On the other hand, A 1 (not shown), an upper die 1, and a lower die 2 are each attached to a press device, and the press device drives the upper die 1 and presses a thin plate-shaped workpiece placed on the lower die 2. 4 is pressed, and a bead 5 is formed on the workpiece 4 as shown in FIG. 9(b).

In FIG. 9(a), male mold 1a and female mold 2 are shown.
a is shown as a single straight line,
By appropriately setting the shapes of the male mold 1a and the female mold 2a along the surface of the workpiece 4, beads 5 of various shapes are formed on the workpiece 4, and as mentioned above, the beads 5 can be made into decorative shapes while reinforcing the workpiece 4. It is possible to form it as a pattern.

In addition, in FIG. 9(a), reference numeral 6.7 indicates a pair of guide pins, which are connected to the male die 1a of the upper die 1 and the lower die 2 during pressing.
This is provided to prevent the position of the female mold 2a from shifting.

FIGS. 10(a) and 10(b) show the case where the bead 5 of the work 4 as described above is formed by a punching machine.

In FIG. 10(a), reference numeral 8 is an upper mold provided opposite to the punching hammer 9a of the above-mentioned punching machine 9, and reference numeral 10 is a bed 9b of the punching machine 9 opposite to the upper mold 8. The lower die is fixed to the The upper die 8 is slidably inserted into the cylindrical holding fitting 11 and holding fitting 11, and a holding die 12a is formed at the lower end, and the upper end protrudes through the flange portion 11a of the holding fitting 11. It consists of a punch 12 connected to a knocking member 13 and a compression spring 14 interposed between the knocking member 13 and the flange portion 11a of the holding fitting 11. Also, lower mold 1
0 has a female die 10 opposite the male die 12a of the punch 12.
a is formed, and the male mold 12a of these punches 12 is formed.
The female mold 10a of the lower mold 10 and the lower mold 10 are each formed long in the direction perpendicular to the plane of the paper in the figure. Then, when the knocking member 13 descends with the operation of the punching hammer 9a of the punching machine 9, the thin plate-shaped workpiece 4 placed on the lower die 10 is clamped and fixed between the presser fitting 11 and the lower die 10, Further, the compression spring is compressed by the knock member 13, and the punch 12 is lowered, and the male die 12a and the female die 10a are
As a result, a bead 5 is formed on the workpiece 4 as shown in FIG. 10(b).

In this case, the lengths of the male mold 12a and the female mold 10a are the same as those of the male mold 1a and the female mold 2 of the press mold 3 shown in FIG.
It is also possible to form a continuous long bead 5 by moving the workpiece 4 relatively shorter than the length a,
It is also possible to form a plurality of parallel beads 5 at regular intervals. Further, as in the case of the press mold 3, it is possible to form beads 5 of various shapes on the workpiece 4 by appropriately setting the shapes of the male mold 12a and the female mold 10a along the surface of the workpiece 4. .

(Problem to be Solved by the Invention) However, in such conventional bead forming methods, when using the former press, only beads of a certain shape could be formed for a certain mold, so it was difficult to form a bead of a desired length. When molding a bead, a mold corresponding to the length is required each time, and there is a problem that the mold has extremely poor versatility. In addition, when using the latter punching machine, although there is some flexibility regarding the length of the bead, when forming a bead of an arbitrary shape, for example, a curved bead, as with the case using a press, A mold corresponding to the shape is required each time, and in each case, there is a problem that the mold lacks versatility. Furthermore, in either case, because the mold is long in the longitudinal direction, large warpage occurs in the thin plate workpiece during bead forming.
For this reason, there was a problem in that it took time to modify and correct the warp, and the machining work became extremely complicated.

(Objective of the Invention) The present invention was made against the background of the problems of the prior art as described above, and it is possible to form beads of arbitrary length or free shape, and furthermore, it is possible to form beads of arbitrary length or free shape, and also to prevent warpage of the workpiece during bead forming. The purpose of the present invention is to provide a bead forming method that greatly reduces the amount of molding, increases the versatility of the mold, and facilitates processing operations.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention includes a male mold having a punch in which a hemispherical processed portion is formed, and a recessed portion in which the processed portion is inserted opposite to the processed portion of the punch. A thin plate-shaped workpiece is held between a female die having a die, and either a male punch or a female die is pressed onto the workpiece between the processed part of the punch and the concave part of the die. By forming protrusions and moving the work perpendicular to the pressing direction, a large number of successive protrusions are formed on the workpiece, forming beads along the direction of movement of the workpiece. This is a characteristic feature.

Hereinafter, the present invention will be specifically explained based on examples. 1 to 3 are diagrams showing an embodiment of an apparatus for carrying out the bead forming method according to the present invention. First, its configuration will be explained.

In FIG. 1, the reference numeral 21 indicates a male type;
is a cylindrical holding fitting 22, a punch 24 which is slidably fitted into the holding fitting 22, whose upper end protrudes through the flange portion 22a of the holding fitting 22, and which is screwed onto the upper knocking member 23; A cylindrical elastic member 25 made of, for example, urethane rubber is interposed between the flange portion 22a of the presser 22 and the knock member 23, and a hemispherical processed portion 24a is formed at the lower end of the punch 24. ing. On the other hand, the reference numeral 26 is a female mold opposite to the ozu mold 21, and the female mold 26 is provided with a die 27.
A recess 27a is formed in the upper part of the male mold 21 so as to face the processed part 24a of the punch 24 of the male mold 21, into which the processed part 24a is inserted when the male mold 21 is operated. Note that the recessed portion 27a of the die 27 is formed in the shape of a horizontal groove having a substantially semicircular cross section, corresponding to the processed portion 24a of the punch 24. The knocking member 23 consists of a lower nut 23a to which the elastic member 25 is fixed and an upper locking nut 23b, each of which is screwed into the upper end of the punch 24 and tightened using the knurling formed on the circular outer periphery. After being inserted, they are fixed to each other by a pair of screws 28. Furthermore, reference numeral 29 is a guide pin of the punch 24, which has a function of engaging with a slit 22b formed in the vertical direction of the holding fitting 22 and guiding the punch 24 when the punch 24 slides. The knock pin 30 of 26 is inserted into the recess 27 of the die 27.
It is provided to position a.

In FIG. 2, reference numeral 31 is a turret-type punch press, and the turret-type punch press 31 includes a plurality of male dies 21 having different sizes of the processing portion 24a of the punch 24 shown in FIG. 1, and corresponding to each processing portion 24a. The same number of egg molds 26 having concave portions 27a of the dies 27 are mounted vertically facing each other. And Fig. 3(a)
As shown in the figure, of the pair of male and female molds 21 and 26 facing each other, the male mold 21 is supported by the upper turret part 31a of the turret type punch press 31 via a compression spring 32, and the male mold 26 is It is fixed to the lower coolet part 31b of the die punch press 31. Roughly speaking, when a thin plate-like workpiece 33 is placed on the female mold 26, the punching hammer 34 of the coolet-type punch press 31 shown in FIG. The compression spring 32 is compressed, and the holding fitting 2
2 descends together with the punch 24, and the workpiece 33 is clamped and fixed between the female die 26 and the holding metal fitting 22, as shown in FIG. 3(b). Further, the elastic member 25 is compressed and the punch 24 slides down on the holding fitting 22, and the punch 24 presses the workpiece 33. At the same time, the third As shown by the imaginary line in FIG. 3(b), a downwardly convex protrusion 35 is formed on the workpiece 33. In this embodiment, the male mold 21 and the female mold 26 constitute the upper mold and the lower mold of the turret type punch press 31, respectively, and the male mold 2
The punch 24 of the male die 21, which is the upper die of the die 27 of the female die 26, is pressed onto the workpiece 33, and a protrusion is formed on the workpiece 33 between the processed part 24a of the punch 24 and the recessed part 27a of the die 27. 35. The elastic member 25 also has the function of absorbing the impact caused by the punching hammer 34 when the punch 24 presses.

On the other hand, the workpiece 33 is driven by the turret type punch press 31 and moves perpendicularly to the pressing direction of the punch 24, that is, in the horizontal direction, and the movement of the workpiece 33 is repeated by a predetermined amount for each press of the punch 24. For example, as shown in FIG. 4(a), the protrusions 35 of each press of the punch 24 overlap each other to form a large number of successive protrusions 35, and these protrusions 35 form a string-like bead 36. The workpiece 33 is formed. therefore,
If the moving direction of the workpiece 33 is set variously as shown in FIG. 4(a) to FIG. 7(a),
As shown in b), beads 36 of various shapes along the moving direction of the work 33 are formed on the work 33. The operation of the punching hammer 34 of the coolet type punch press 31 and the movement of the workpiece 33 are based on a pre-created program, and the turret type punch press 3 shown in FIG.
This is executed under the control of the NC control unit 31C of No. 1. In addition, when changing the width of the bead 36 to be formed on the workpiece 33, the upper coolet part 31a and the lower turret saw F part 31b are operated to create a plurality of male molds 21, female molds 2,
A bowl mold 21 and a rice mold 26 corresponding to the width of the bead 36 from among the punching hammers 6 are positioned opposite to the punching hammer 34. Further, the size of the processed portion 24a of the punch 24 of the plurality of male dies 21 attached to the turret type punch press 31 is, for example, 3.
This corresponds to the width of the bead 36, such as 4.5 mm.

Next, the operation of the above-mentioned apparatus will be explained, and an embodiment of the bead forming method according to the present invention will also be explained.

In FIG. 2, the coolet type punch press 31 has a first
A plurality of male dies 21 having processed parts 24a of various sizes shown in the figure are attached to the upper coolet part 31a, and opposite to these male dies 21, corresponding female dies 2G are attached to the lower turret part 31b. . Next, a pair of male molds 21 and female molds 26 suitable for the bead width to be formed are formed.
However, the upper turret part 31a and the lower turret part 31b
As a result of this movement, it is positioned at a position opposite to the punching hammer 34 of the turret type punch press 3I. Continuing,
In FIG. 3(a), a workpiece 33 is placed on the female mold 26, and the punching hammer 34 shown in FIG. 2 is operated to press the knocking member 23 of the male mold 21. Along with this, the compression spring 32 is compressed and the holding fitting 22 is pressed against the punch 2.
4, and the workpiece 33 is clamped and fixed between the female die 26 and the holding fitting 22 in FIG. 3(b). Furthermore, the elastic member 25 is compressed and the punch 24 descends,
The punch 24 presses the workpiece 33, and at the same time the punch 24
A projection 35 is formed on the workpiece 33 between the processed portion 24a and the recess 273 of the die 27, as shown by the imaginary line in FIG. 3(b). After one press of the punch 24 described above,
The punching hammer 34 returns and the male die 21 is separated from the workpiece 33, and at the same time the workpiece 33 is driven by the turret type punch press 31 and moved by a predetermined amount in the horizontal direction, and the punch 24 is pressed by the punching hammer 34 again. Ru. Then, the pressing of the punch 24 and the movement of the workpiece 33 are repeated one after another, and as shown in FIG. 4(a) to FIG. A string-like bead 3G is formed.

At this time, in FIG. 2, the operation of the punching hammer 34 of the turret type punch press 31 and the workpiece 33 are shown.
The movement is performed by NC based on various programs created in advance.
ll1l [controlled by section 31c. If the set moving direction of the workpiece 33 is a linear direction as shown in FIG. 4(a), the bead 36 is
) is formed into a straight line as shown in the figure. In addition, Fig. 5 (a
) and FIG. 6(a) respectively show the set workpiece 33.
The bead 3 is formed along the direction of movement of the workpiece 33, respectively.
6 has a circular and diagonal shape as shown in FIG. 5(b) and FIG. 6(b). Furthermore, as shown in FIG. 7(a), by sequentially changing the moving direction of the workpiece 33 to straight lines, circular arcs, and diagonal lines, a plurality of circular arcs, straight lines, as shown in FIG. 7(b), A complex loop-shaped bead 36 surrounded by diagonal lines can be formed. In addition, Figure 4 (
When molding straight beads 36 and diagonal-lined beads 36 that are spaced apart from each other as shown in a) and FIG. This is possible by combining.

In this way, in this embodiment, the thin plate-like work 33
While being moved by the turcissor 1 to the die punch press 31, the punch 24 of the male die 21 is operated by the punching hammer 34 of the turret type punch press 3I to form the hemispherical processed portion 24a of the punch 24 and the recessed portion 27a of the die 27. A large number of protrusions 35 are formed sequentially on the workpiece 33 between the beads 3 along the moving direction of the workpiece 33.
6 is molded. Therefore, as shown in FIGS. 4 to 7, it is possible to form a bead 36 of any length or shape. Moreover, since the turret type punch press 31 is provided with a male die 21 and a female die 26 corresponding to various widths of the bead 36, the width of the bead 36 can also be changed arbitrarily. In particular, when designing prototypes or producing small lots, there is no need for a special mold, and beads 3 of a predetermined shape can be formed.
6 can be easily molded. Therefore, it is possible to significantly reduce the cost of the device. In addition, punch 24
Since the processing portion 24a is hemispherical and the processing range for each press is narrow, warping of the workpiece 33 during forming the bead 36 can be significantly reduced. Therefore, the mold shape is highly versatile, and the workpiece 33 can be processed easily without the need for warping or correction.

FIG. 8 is a diagram showing another embodiment of the apparatus for carrying out the bead forming method of the present invention. In FIG. 8, reference numeral 41 is a female die, and the female die 41 has the punch 24 shown in FIG. The other configurations are the same as the male mold 21 shown in FIG. The male die 43 located below the female die 41 has a punch 44 fitted vertically in the center thereof, and the protruding end of the punch 44 protruding from the male die 43 is machined into a hemispherical shape. Part 44a
is formed. Then, the knock member 2 of the egg type 41
3 is pressed by the operation of the punching hammer 34 of the turret type punch press 31 shown in FIG. That is, in this embodiment, the punch 44 of the male mold 43 and the die 42 of the grain mold 41 are pressed onto the workpiece 33 to form the processed portion 44a of the punch 44 and the recessed portion 42a of the die 42. A protrusion 35 is formed on the work 33 between the two. The other configurations and operations are the same as those of the above-mentioned embodiment, so it goes without saying that similar effects can be obtained.

(Effects) According to the present invention, a thin plate-shaped workpiece is moved, and a large number of successive protrusions are formed on the workpiece using the hemispherical processing part of the punch and the recessed part of the die, and Molding beads.

Therefore, it is possible to form a bead of any length or shape, and furthermore, since the processing portion of the punch is hemispherical, warping of the workpiece during bead forming can be significantly reduced. Therefore, it is possible to provide a method for molding a bead of 1°, which is an object of the present invention and which is rich in mold versatility and which is easy to process.

[Brief explanation of drawings]

FIGS. 1 to 3 are views showing an embodiment of a device for carrying out the bead forming method according to the present invention, and FIG. 1 is a perspective view showing a main part broken away, showing the configuration of a male mold and a female mold. Fig. 2 is an external view showing the turret type punch press, Fig. 3 (a) is a sectional view of the main part showing the state in which the male type and the maru type are attached to the turret type punch press, and Fig. 3 Figure (b)
is an enlarged view of part A in FIG. 3(a) when the male mold is in operation, and FIGS. 4 to 7 are views showing the shape of the bead formed by the bead forming method according to the present invention, respectively. , among FIGS. 4 to 7, FIG. 4(C) is a sectional view taken along the line X--X in FIG. 4(b). FIG. 8 is a cutaway perspective view of a male mold and a female mold showing another embodiment of the device for carrying out the bead forming method according to the present invention. Roughly, Figures 9(a), (b) and 10(a), (b)
) is a diagram showing a conventional example, FIG. 9(a) is a perspective view of the press die, and FIG. 9(b) is a view taken along the Y-Y arrow in FIG. 9(a) when the press die is in operation. An enlarged sectional view, FIG. 10(a) is a front sectional view of the main part of the upper die and lower die provided in the punching machine, and FIG. 10(b) is FIG. 10(a) when the punching machine is in operation. It is an enlarged view of part B in FIG. 21.43...--Zu type, 24.44...Punch, 24a, 44a--Processing section, 2G, 41...
...Egg shape, 27.42...Gui, 27a, 42a...Concave part, 33-...
・-Work, 35...-Protrusion, 36...Bead. Agent: Patent attorney or U) q.

Claims (1)

[Claims] A thin plate-like workpiece is held between a male die having a punch with a hemispherical processed part formed therein and a female die having a die opposite to the processed part of the punch and formed with a recess into which the processed part is inserted. Press either one of a mold punch and a female die onto the workpiece to form a protrusion on the workpiece between the processed portion of the punch and the recessed portion of the die, and move the workpiece perpendicular to the pressing direction. A bead forming method characterized in that a large number of successive protrusions are formed on a workpiece to form a bead along the movement direction of the workpiece.