JPS6340611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a plate joining device for joining a plurality of plate materials by a type of press forming.

(Prior Art) An example of a method for joining a plurality of plate materials by a type of press forming is disclosed in Japanese Patent Publication No. 52-21758. As shown in FIGS. 14 and 15, two metal plates 1 and 2 to be joined are stacked one on top of the other, and a substantially trapezoidal bulge 3 with both sides cut off is first placed at a predetermined location. (see Fig. 14), and then swage the bulging portion 3 to make it extend laterally (see Fig. 15).
4 to join the two metal plates 1 and 2 in such a way that the bulge 3 does not come out from the hole 5 formed in the metal plates 1 and 2. A joining device for joining metal plates in this way is shown in FIG.
In FIG. 16, 6 is a pedestal that supports the metal plates to be joined, 7 is a punch, 8 is a cutting die, and 9 is a flat punch. is lowered to press the metal plates 1 and 2 to be joined onto the pedestal 6 (see Fig. 16a), and then the punch 7 is raised to bulge due to the cooperation with the cutting die 8. 3 (see Fig. 16b), and finally, in order to make the bulging part 3 extend laterally, the cutting die 8 is raised (see Fig. 16c), and in this state, a flat punch is used. 9 is lowered to embed the bulge 3 (see Fig. 16d).

(Problems to be Solved by the Invention) However, in the joining device having the above configuration, the cutting die 8 is raised to extract the bulging portion 3 from the cutting die 8 before the bulging portion 3 is swaged, and the bulging portion 3 is extracted from the cutting die 8. The projecting portion 3 must be allowed to expand laterally, which complicates the movement of the mold. For this reason, a special press such as a double-acting press must be used to operate the mold, which increases equipment costs and also requires a series of punch operations to form the bulge 3 and swage it. There is a problem that it is difficult to carry out the work properly and the productivity is low.

The present invention was made in view of the above circumstances, and
The purpose of this is to be able to be used by attaching it to a general single-function press, reducing equipment costs, and
An object of the present invention is to provide a plate joining device that can form a bulge and swage by a series of punch operations, thereby improving productivity.

[Structure of the Invention] (Means for Solving the Problems) The plate joining device of the present invention forms a bulge in stacked plate materials by the cooperative action of a punch and a die, and further forms a bulge in a series of punch operations. In the method of joining plate materials by swaging, the die has a plurality of expandable partitions to allow the plate material to expand in the lateral direction during swaging,
In addition, the device is characterized by being equipped with a restoring mechanism for returning the expanded wall portion to its original position.

(Function) According to the present invention of the above means, since the die has a plurality of expandable partitions to allow the plate material to expand in the lateral direction, when swaging the bulge, the die has a plurality of expandable partitions. There is no need to pull out the bulge from the die. Therefore, the formation of the bulge and its swaging can be performed by a series of punch operations, which improves productivity and simplifies the movement of the mold.
It can be used by attaching it to a general press.

In addition, since it is equipped with a restoring mechanism that returns the expanded dividing wall to its original position, it is possible to maintain the expansion starting force of the dividing wall constant over a long period of time, and the restoring mechanism Adjustment can be made by replacing, etc.

(Embodiment) An embodiment of the present invention will be described below based on FIGS. 1 to 12. 11 is a punch holder attached to the ram 12 of the press, 13 is this punch holder 1
This is a punch plate fixed to the lower part of the punch plate 13, and a punch 14 is fixed to the center of the punch plate 13. Reference numeral 15 denotes a presser plate supported vertically via a guide pin 16 below the punch plate 13, which is supported by a compression spring 17 interposed between the punch plate 13 and the punch plate 13 so as to be wound around the punch 14. It is always pushed down to the lowest position shown in FIG. On the other hand, 18 is a bolster attached to the bed 19 of the press, and a die 20 is fixed to the upper part of this bolster. A hole 21 penetrating vertically is formed in the center of the die 20, and grooves 22, 22 opening at the upper end surface are formed on corresponding opposite sides of the peripheral wall of the hole 21. As the punch 14 descends, the plate material to be joined bulges out into the hole 21 of the die 20 as will be described later, and therefore the hole 21 functions as a die hole. As a result of the above structure, the peripheral wall of the die hole 21 is divided into a plurality of, for example, two, expandable partition walls 20a, 20 divided by grooves 22, 22 that open at the upper end surface.
a, and the edges on the hole 21 side of the upper end surfaces of the respective partitioned walls 20a, 20a have cutting edges 23, 2 whose central portions are concave in an arc shape.
It is formed as 3. Note that 22a and 22a indicate the wide portions of the lower half portions of the grooves 22 and 22. 24 is an expansion regulating member made of an elastic material as a restoring mechanism;
This is installed around the outer circumference of the upper end of the dividing wall 20a of the die 20, and maintains the die 20 in its restored state with a strong tightening force based on its elasticity.
When the dice 20 are expanded, they are elastically expanded. Reference numerals 25 and 25 indicate pins that are attached to corresponding opposite sides of the expansion restriction member 24 and have one end inserted into the groove 22 of the die 20. This pin is caused by the strong tightening force of the expansion restriction member 24, causing the die 20 to move more than necessary. This is to prevent the diameter from decreasing. Reference numeral 26 denotes a two-part elastic seat plate made of, for example, a relatively hard rubber material and placed on the lower end large diameter portion 20b of the die 20.
7 is a male threaded portion formed in the lower part of the die 20;
A nut 8 is fitted around the outer periphery of the die 20 so as to be screwed into the male threaded portion 27, and the nut 28 is fastened and fixed onto the elastic seat plate 26. The nut 28 is screwed back and forth into the groove 2.
The nut 2 can be moved in the depth direction of the nut 2, that is, in the vertical direction, and by replacing the elastic seat plate 26 with another elastic seat plate having a different thickness as necessary.
8 fixed height positions can be adjusted over a wide range. In this way Natsu 28
If you change the height position of the die 20, the length dimension of the groove 22 that contributes to the expansion of the die 20 will change.
It is possible to adjust the expansion start force of 0 at the lower end side. 29 is the hole 21 of the die 20
A shaft rod is housed inside the shaft so as to be able to move up and down, and its lower half is inserted into a holding hole 30 formed in the bolster 18. 31 is the holding hole 3 of the bolster 18
An adjustment screw 33 screwed into the lower end female threaded portion 32 of 0
is a compression spring interposed between this adjustment screw 31 and the flange 29a of the shaft rod 29, and
9 is always pushed up to a position where its upper end is flush with the upper end of the die 20 by the elastic force of the compression spring 33. When the shaft rod 29 is pushed down a predetermined amount against the elastic force of the compression spring 33, it comes into contact with the adjustment screw 31.
The length of descent to the point of contact can be adjusted by screwing the adjustment screw 31 back and forth.

Next, the operation of the above configuration will be explained. First, for example, two plate materials 34 and 35 to be joined are stacked vertically and placed on the die 20, and in this state, the ram 12 of the press is lowered. When the ram 12 descends by a predetermined amount, the presser plate 15 comes into contact with the plates 34 and 35 and presses and fixes them onto the die 20, and the presser plate 15 itself is prevented from descending any further (see Figure 3). . When the lowering of the presser plate 15 is stopped in this way, the punch 14 is then moved by the ram 12.
Since only the chisel continues to descend, both plates 3
4 and 35 are pressed against the die 2 by the pressing force of the punch 14.
It bulges out into the hole 21 and groove 22 of 0. The portion of the bulging portion 36 corresponding to the groove 22 remains continuous to the plate materials 34 and 35, and the cutting edge 2
Both sides corresponding to 3 and 23 are cut by the cooperative action of the punch 14 and the cutting edges 23 and 23 (see FIGS. 4 and 6). In this way, plate material 3
4 and 35 expand, the shaft rod 29 is pushed down against the elastic force of the compression spring 33.
Eventually, its lower end will come into contact with the adjustment screw 31, but the punch 14 will further descend by a certain amount after that.
6 becomes strongly embedded. That is, the punch 14 has a swaging region that is the downward stroke region from the point when the shaft rod 29 contacts the adjustment screw 31 to the lowest position. When reaching the jamming area, the lowering is stopped, the bulge 36 is received, and the swaging force of the punch 14 is applied to the bulge 36. As the punch 14 descends in the swaging area, the bulge 36 expands in the direction of the cutting side, causing the wall portions 20a, 20a of the die 20 to move in the directions of arrows 37 and 38 (FIG. 7). (see). When this expanding force exceeds a predetermined value, the cut ends on both sides of the bulging portion 36 expand the partitioned walls 20a, 20a of the die 20 while resisting the tightening force of the expanding restricting member 24. (see Figures 5 and 6). When the ram 12 completes its predetermined downward movement and rises, the punch 14 rises together with the presser plate 15 and returns to its original position, while the shaft rod 29 returns to its upward position due to the elastic force of the compression spring 33. During the return process, the bulging portions 36 of both the plates 34 and 35 are pushed up and extracted from the holes 21 and grooves 22, whereby the die 20 is reduced in diameter by the tightening force of the expansion regulating member 24 and restored.

Note that the shape of the tip of the punch 14 is such that both sides are notched at acute angles as shown in FIG. It is preferable to reduce the contact area of
Cracks may occur due to the edges 14a, 14a of the notch. In this case, it is preferable to gently slope both sides as shown in FIG. 9, so that the boundary portions 14b and 14b with the sloped surfaces are appropriately rounded. FIG. 10 shows the bulge formed by the punch shown in FIG. 8, and FIG. 11 shows the bulge formed by the punch shown in FIG. 9.

As described above, in this embodiment, the bulging portion 36 is pushed in and expanded laterally, and the two plate members 34 and 35 are joined by the overhanging portions 39 and 40 (see (See Figure 12), Dice 2
0 has expandable partitions 20a, 20a, so when the bulge 36 is inserted into the hole 21 of the die 20, the bulge 36 expands in the lateral direction while expanding the die 20. Therefore, there is no need to remove the bulging portion 36 from the die 20 before swaging it. For this reason, a set of punches 1
4 and the die 20 can constitute a joining mold, and the forming of the bulging part 36 and the swaging of the bulging part 36 can be performed continuously by one downward movement of the punch 14, that is, by a series of punch operations. This greatly reduces the number of strokes and greatly improves productivity. Moreover, it can be installed and used in a general single-capacity press, and equipment costs can be kept low.

In particular, in this embodiment, the die 20 has a groove 22.
By forming a plurality of partition walls 20a,
Since the die 20a is formed, the structure of the die 20 itself becomes extremely simple and the manufacturing cost becomes low.

By the way, in order to accurately form the bulging portion 36, the die 20 is prevented from expanding inadvertently during molding, and is regulated to expand only when a predetermined expanding force is exceeded. There is a need. In that case, the expansion starting force is applied to the dividing walls 20a, 20a.
If you try to use the elastic restoring force of the die 20, it is difficult to balance the rigidity and elastic deformability of the die 20, and it is difficult to accurately set the expansion starting force. Even if they are formed into the same shape, they differ greatly depending on the material they are made of, and furthermore, there is a concern that the expansion starting force changes early due to repeated expansion and contraction.

However, according to this embodiment, since the die 20 is equipped with the expansion restriction member 24, when the expansion restriction member 24 exceeds a predetermined expansion force, the dividing walls 20a, 20a are expanded. It is possible to control the expansion starting force and maintain the expansion starting force constant over a long period of time. Furthermore, the dividing wall portion 20a,
In the case where the expansion starting force is regulated by the elastic restoring force of the die 20a itself, if the expansion starting force changes due to aging, the entire die 20 must be replaced with a new one. According to this embodiment, this problem can be dealt with by replacing the expansion restricting member 24. Furthermore, even if the expansion starting force is changed depending on the thickness or material of the plates to be joined, this can be handled by leaving the die 20 as is and replacing the expansion regulating member 24 with another one, so that overall expansion can be improved. The opening force can be adjusted at low cost. In this way, according to this embodiment, the expansion of the dice 20 is caused by the dividing wall 2
Unlike those that use the elastic restoring force of 0a and 20a to regulate, this method has the effect that the expansion starting force of the dice 20 can be adjusted over a wide range by using the elasticity of the expansion regulating member 14. be. In this case, especially if the expansion regulating member 14 is provided at the upper end of the die 20 as in this embodiment, the dividing wall portion 20a,
There is an advantage that the expansion starting force of 20a can be set more accurately.

In addition, especially in this embodiment, since the nut 28 is provided on the outer periphery of the lower part of the die 20 so that its position can be adjusted up and down, the opening force of the die 20 can also be adjusted by adjusting its position.

In the above embodiment, the bulge 36 itself is expanded in the lateral direction, but as shown in FIG. Alternatively, the connecting material 41 may be swaged by the punch 14 so that it protrudes outward from the cut portions on both sides of the bulging portion 36. Further, the peripheral wall of the hole 21 of the die 20 is not limited to the two partition walls 20a, 20a as in the above embodiment, but is composed of three or more partitions divided into three or more parts by grooves. This is required in terms of design and manufacturing, such as being able to consist of a wall.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and the configuration of the dividing wall portion of the die and the configuration of the restoring mechanism are not limited to those of the above embodiments. For example, the restoring mechanism is Various changes can be made without departing from the spirit of the invention, such as a configuration that utilizes spring force.

[Effects of the Invention] As explained above, in the present invention, the die has a plurality of expandable partitions to allow the plate material to expand in the lateral direction. The swaging can be performed by a series of punch operations, which improves productivity and simplifies the movement of the mold, so it can be used by being attached to a general press, reducing equipment costs. be able to. Moreover, since it is equipped with a restoring mechanism that returns the expanded wall to its original position, the opening force of the wall can be maintained constant over a long period of time, and the opening force can be used to replace the restoring mechanism. It has excellent effects such as being able to adjust it over a wide range and easily adapting to the materials of the plates to be joined.

[Brief explanation of the drawing]

Figures 1 to 12 show one embodiment of the present invention, in which Figure 1 is an overall longitudinal sectional side view, Figure 2 is an exploded perspective view of the die and seat plate, and Figures 3 to 5 are 6 is a vertical sectional view taken along the - line in FIG. 4, and FIG.
8 and 9 are perspective views of the punch shown in different forms, respectively.
11 are bottom views of the bulges formed by the punches of FIGS. 8 and 9, respectively, FIG. 12 is an enlarged cross-sectional view of the bulges shown in a joined state, and FIG. 13 is a bottom view of the bulges formed by the punches of FIGS. FIG. 12 is a diagram corresponding to FIG. 12 showing another embodiment.
14 to 16 show a conventional joining method, FIGS. 14a and 14b are cross-sectional views showing the bulge cut in different directions, and FIG. 15 is a sectional view showing the bulge in a joined state. Cross-sectional view of the exit part, Figures 16a to d
2A and 2B are cross-sectional views sequentially showing the joining process. In the figure, 14 is a punch, 15 is a presser plate, 20 is a die, 22 is a groove, 23 is a cutting edge, 24 is an expansion regulating member (restoration mechanism), 29 is a shaft rod, 34, 35
36 is a plate member, and 36 is a bulged portion.

Claims (1)

[Claims] 1. For joining plates by forming a bulge in stacked plates by the cooperative action of a punch and a die, and then performing swaging processing by a series of subsequent punch operations, the die is characterized in that it has a plurality of expandable partitions to allow the plate material to expand in the lateral direction, and is equipped with a restoring mechanism for returning the expanded partitions to their original positions. A device for joining plate materials.