JPH03189029A - Method and apparatus for joining sheet - Google Patents

Abstract

PURPOSE:To joint sheets at low cost by cutting in one of surfaces of plural piled sheets along two lines and giving bending deformation to a forming area between both cut-in lines. CONSTITUTION:On one of the surfaces of the sheets 21, 22 which are piled on each other are cut in two lines which separate from each other and spread gradually on the surface. In this time, a bending deformation is given to a forming area 24 between both cut-in lines in such a radiating direction that the smaller one of widths between both cut-in lines makes a fulcrum and the forming area 24 is inclined to the area outside both cut-in lines. In this way, plural piled sheets can be joined without material constraint and at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin plate joining method and a thin plate joining apparatus for mutually joining a plurality of stacked thin plates.

[Conventional technology]

A conventional example of joining thin plate materials is, for example, Japanese Patent Application Laid-Open No. 61-7
It is described in Publication No. 026. As shown in FIG. 21, this method involves placing two metal plates 33 and 34 on top of each other on a pair of movable die blocks 32 and 32 placed on both sides of an anvil member 31, respectively. , is performed by pressing a punch 35 from above,
The inner upper edges 36, 36 of the movable die blocks 32, 32 are cut against the lower metal plate 33 at the positions where the movable die blocks 32, 32 are in close contact with both sides of the anvil member 31, respectively. Functions as a blade. As a result, in the process of lowering the punch 35, first,
The lower metal plate 33 is cut along the upper edges 36, 36 of the movable die blocks 32, 32.

Next, both movable goo blocks 32, 32 are moved in the direction away from the anvil member 31, as shown in the figure, and from then on, plastic deformation is caused in both metal plates 33, 34 as the punch 35 descends. .

That is, the area between the two cutting lines on the lower metal plate 33 (hereinafter referred to as the forming area) is the area remaining on the movable die blocks 32 and 32 (hereinafter referred to as the non-forming area). ), and press down until an opening is created between both areas to abut against the anvil member 3I.

Then, in this state, by continuing the downward pressing force from the punch 35, through the opening between the forming area and the non-forming area in the lower metal plate 33,
Lateral extrusion deformation regions 37 are produced in the upper metal plate 34. As a result, on the side where the lower metal plate 33 is not cut, the periphery of the forming area is formed in a shape that continues integrally with the non-forming area, as shown in FIG. On the cut side, as shown in FIG. 23, the upper metal plate 34 has a structure in which the edge of the non-forming area of the lower metal plate 33 is sandwiched from above and below,
This provides a bonding structure between the metal plates 33 and 34.

[Problem to be solved by the invention]

However, in the above conventional method, the upper metal plate 3 is deformed in a side direction different from the compression direction by the punch 35.
4, and requires a larger compression force than, for example, processing in which the deformation direction is the same as the compression direction. Therefore, in order to prevent damage to mold tools such as the punch 35 and the anvil member 31, it is necessary to configure the mold with higher strength depending on the characteristics such as strength and hardness of the materials to be joined. As a result, there is a drawback that the cost of the device becomes high, resulting in an increase in cost.

Furthermore, in the above conventional method, the upper metal plate 34 is required to be made of a material that is more likely to undergo plastic deformation, that is, has greater malleability. In this case, no deformation occurs, but the upper metal plate 34 deforms laterally. In this way, in the conventional method, the combinations of workpieces that can be stacked on top of each other are restricted, and for this reason, it is necessary to configure a mold with higher strength depending on the characteristics of the materials to be joined. In addition to this, there is also the problem of lack of versatility.

The present invention has been made in view of the above, and an object of the present invention is to provide a thin plate material that can join a plurality of stacked thin plate materials at a lower cost and that can reduce material constraints. It is an object of the present invention to provide a joining method for thin plate materials, and also to provide a joining apparatus for thin plate materials that can efficiently carry out the joining method.

[Means to solve the problem]

Therefore, the method for joining thin plate materials according to claim 1 of the present invention is as follows:
A cut is made from one surface of a plurality of thin plates stacked on top of each other along two lines that gradually widen apart from each other on the surface, and a cut is made between the two cut lines in the forming area between the two cut lines. It is characterized by applying bending deformation in the direction of rotation using the side with the smaller dimension as a fulcrum, thereby making the molding region inclined with respect to the region outside the above-mentioned both score lines.

Further, the joining device for thin plate materials according to claim 2 of the present invention includes a female die having an opening for forming processing, and a tip thereof moving in and out of the opening by moving relatively back and forth in the direction of the female die. A punch is provided at the tip of the punch, and the punch has an inclined machined surface that widens from one side to the other and slopes so that the longer side in the width direction is located closer to the tip than the shorter side. At the same time, both edges of the inclined machined surface in the width direction fit into the opening to function as cutting edges, and the female die is composed of a divided die divided by a plane passing through the opening, It is characterized in that the divided dies respond in a direction in which they are separated from each other in response to a lateral pushing force from the workpiece within the opening.

[For production]

According to the method for joining thin plate materials according to claim 1, for example, as shown in FIGS. A forming area 24 between the cutting lines along two lines that gradually widen apart from each other.
However, a joining structure is formed that is inclined with respect to the non-forming region outside these cutting lines. That is, immediately after cutting, the cut surfaces Cn of the 24 molding regions adjacent to each other and the cut surfaces Cm of the non-molding region side are bent by bending deformation in the rotational direction with the smaller width side of the molding region 24 as a fulcrum. By performing this on the molding region 24, as shown in FIG. 3, the cut surface Cn of the molding region 24 example is located outward from the cut surface CII+ on the non-molding region side. As a result, the forming area 2 in the upper thin plate 21 in the figure
4 is the cut surface C of the non-forming area in the lower thin plate material 22
It becomes a structure that cannot be separated upward between l1-0111,
As a result, both the thin plates 21 and 22 are joined to each other.

In this way, in the above method, two cuts are made from the surface, and the area between the two cuts is bent in the rotational direction using the short side between the cut lines as a fulcrum, thereby forming a thin sheet material. Since joining is performed, and the joining structure is formed by cutting and bending, it is possible to form with a smaller processing force than in the past. Therefore, there is no need for a mold structure having high strength as in the past, and as a result, processing costs can be lowered. Furthermore, in the conventional method, there were restrictions on combinations such as making one of the materials to be joined a member with greater malleability, but the above method does not have such restrictions, and therefore can be used in a wider range of materials. It can be applied to a wide range of materials to be joined.

Further, in the apparatus for joining thin plate materials according to claim 2, the tip of the punch is provided with a sloped surface whose both side edges function as cutting edges, and the sloped surface has a shape that widens at the tip side. Therefore, during the forward movement of this punch, the workpiece is cut along both edges of the inclined surface.
The joining structure is formed by simultaneously bending and forming the forming area between the cutting lines along the inclined surface. Furthermore, as a result of this processing, when taking out from the opening of the female die a molded area whose width has apparently expanded wider than the width at the time of cutting, as described above, In this case, the molding region comes into contact with the inner wall surface of the female die having the split structure and pushes it laterally. As a result, the divided die moves such that the width at the opening expands in accordance with the width of the molding area, and ejection can be performed without any problem. As a result, for example, the above-mentioned forming and punching can be performed by one stroke of the punch,
That is, since the stamping operation can be performed by a -stamping operation, it is possible to provide an apparatus configuration with high production efficiency.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 20.

As shown in FIG. 4, the lower die unit provided in the thin plate welding apparatus according to the embodiment of the present invention has a pair of Gui blocks ( A pair of support blocks 2, 2 extending in the left-right direction in the same manner as described above are provided on the outside of these guiblock blocks 1. As shown in FIGS. 5 and 6, these support blocks 2, 2 are attached to the fixed bed 4 in a state in which they are suspended from the upper surface of the fixed bed 4 by compression coil springs 3.

On the other hand, each of the die blocks 1 faces each other on the inside in the width direction at a position where the outer end surface in the vertical direction (hereinafter referred to as the width direction) abuts on each support block 2 in FIG. The width dimensions are such that a predetermined gap is created between the inner end surfaces 1a and 18, and the grip blocks 1 are mounted so as to be slidable in the width direction on the fixed bed 4. As shown in FIG. 6, each die block 1 and the support blocks 2, 2 are in contact with each other on an inclined surface. When the support blocks 2, 2 are pushed down, each die locked 1 moves from the separated position shown in FIG. It is designed to move to a close contact position.

In addition, in each of the inner end surfaces 1a, 1a of the die locked 1, as shown in FIG. 4, recessed grooves 5 recessed outward in the width direction are formed at predetermined intervals in the left and right direction. has been done. When both die locked 1 are in the close contact position, as shown in FIG. An opening 6 for processing is formed. This frontage 6
The surfaces facing each other in the width direction are the inner end surfaces 1
A central portion is formed by parallel surfaces 6a and 6a that are parallel to a and 1a, respectively, and a slope that extends laterally from both end positions of these parallel surfaces 6a and 6a, respectively, inclines outward in the width direction. It is formed of side surfaces 6b...

As shown in FIGS. 4 and 5, each opening 6 formed as described above has the parallel surfaces 6a and 6a.
The support block 7 has a width dimension that is almost the same as the dimension between the support blocks 7 and 7.
... are arranged respectively. These support blocks 7
The upper surface side of the die-locked 1 includes an upper end flat portion 7a located between the parallel surfaces 6a and 6a at approximately the same height as the upper surface of the die locked 1, and both sides of this upper end flat portion 7a, that is,
A region between the inclined side surfaces 6b and 6b of the opening 6 is formed into a shape consisting of downwardly inclined inclined surfaces 7b.

Next, the configuration of the upper die unit in the above-mentioned thin plate joining apparatus will be explained.

As shown in FIG. 9, this upper mold unit is provided with punches 11 disposed at upper positions corresponding to the respective openings 6 in the lower mold unit. The upper end of the punch 11 is fixed by a punch holder 12 to a ram (not shown) that reciprocates in the vertical direction in a press machine. Further, a stripper plate 13 surrounding the outer periphery of the punch 11 is disposed at the lower end position of the punch 11, and a punch plate 14 is interposed between the stripper plate 13 and the punch holder 12. . The stripper plate 13 is made of an elastically deformable material such as hard synthetic rubber, and
As shown in the figure, when the punch 11 is located at its top dead center position, it is moved up and down by a spring support mechanism (not shown) so that the punch 11 is held at a height where the lower surface is located slightly below the lower end of the punch 11. Possibly supported.

At the lower end of the punch 11, sloped surfaces 11a and 11a are formed in a bilaterally symmetrical shape, with the side portions located lower than the center side. As shown in FIG.
It is formed in a shape that is wider on the sides than on the center side, roughly corresponding to the shape of. The shape of the sloped surfaces 11a and lla in the width direction that gradually widens as described above is caused by the opposing sloped side surfaces of the opening 6.
It has a shape that fits between b. The upper edge portion of 6b mutually functions as a cutting edge. On the other hand, in FIG. 9, a gap is formed between the vertical surfaces 11c and llc at both left and right ends of the punch 11 and the inner surface of the opening 6, which is approximately equal to the thickness of the metal thin plate described later. .

The operation of the apparatus for joining thin plate materials having the above structure will be explained by taking as an example the case where two metal plates 21 and 22 as thin plate materials are joined together, as shown in FIG.

First, two metal plates 21 and 22 stacked on top of each other are placed on the lower die unit. In this case, the metal plate 21
- 22 is supported on the support block 2 at a position floating several millimeters above the top surface of the die block 1, as shown in FIG.

Next, when the punch 11 starts lowering, the lower surface of the bunch holder 12 comes into contact with the upper surface of the bunch plate 14 during this lowering operation, and from then on, the punch plate 14
The stripper plate 13 also moves down together with the punch 11.

Then, the lower surface of the stripper plate 13 is connected to the metal plate 21.
After contacting the upper surface of the metal plate 22, the metal plate 21, 22 and the support block 2 are also pushed down while descending. It should be noted that by pushing down the support block 2, the guide blocks 1 move toward each other as described above.

Then, the upper surface of the support block 2 is pushed down to the same height as the upper surface of the Goui block 1, so that the metal plates 21 and 22 are held and clamped between the Goui block 1 and the stripper plate 13. At this time, the guide lock l is located in a close contact position where the inner end surfaces 1a, 1a are in close contact with each other.

Next, as shown in FIG. 11, while causing the stripper plate 13 to undergo elastic deformation due to compression, the punch 1 is
1 falls slightly further downward. this punch 1
1, the metal plates 21 and 22 undergo deformation along the inclined machined surfaces 11a and 11a of the punch 11 in the region located inside the opening 6. This transformation is
As shown in the figure, in the central region located on the upper end flat portion 7a of the support block 7, a central undeformable region 23 is located at the same height as the region outside the frontage 6 (hereinafter referred to as the non-forming region). Then, with both ends of the central undeformed region 23 as fulcrums, the inclined machined surfaces 1 of the punch 11 extend from these ends to the lateral regions.
A downwardly sloping deformation occurs along 1a·llakm. At this time, at both ends of the opening 6 in the left and right direction, as described above, there is a gap approximately corresponding to the total thickness of the metal plates 21 and 220 between the vertical surfaces 11c and llc at both left and right ends of the punch 11. As a result, bending deformation occurs along the edge shape between the inclined processed surfaces 11a/lla and the vertical surfaces 11c/llc in the punch 11, and the non-forming area outside the opening 6 is integrally formed. The shape is continuous.

As described above, the inclined surface 11 of the punch 11
On the sides of the lower edge portions 11b in a and lla, these function as cutting blades, so cutting the two metal plates 21 and 22 along the lower edge portions 11b causes the above-mentioned bending deformation. It is occurring with.

Figures 1 to 3 show the metal plate 21 after undergoing the above processing.
As shown in the figure, these metal plates 21 and 22 have a pair of depression-shaped molding areas 24 and 24 for each opening 6 in the lower mold unit, and a central undeformed area 23. They are formed in symmetrical shapes on both sides of the . These forming regions 24, 24 are cut on both sides along the lower edge portions 11b of the punch 11, respectively, and the inclined processed surfaces 11a, lla of the punch 11
It is formed by undergoing bending deformation inclined along the above-mentioned cutting lines, and the molded areas 24 between the two cutting lines and the non-molded area outside the cutting lines are adjacent to each other with a step. There is. When this step shape is looked at in detail, as shown in FIG. 3, the cut surface Cm on the non-forming area side is left as a cut mark of the cut substantially along the lower edge portion 11b of the punch 11.・Cn... on both sides of the molding area 24 (the end surfaces indicated by broken lines in the figure) is better than ・Cn...
They are each located outward in the width direction.

In other words, each of the molding regions 24 has a shape in which the width between the cut surfaces Cn and Cn on both sides becomes wider as the distance from the central undeformed region 23 increases, and Since it is formed in an inclined state by bending deformation in the rotational direction with the connecting edge fb as a fulcrum, in the process of this bending deformation, the cut surface Cn of each forming area 24 is similar to the non-forming area immediately after cutting. From the position adjacent to the side cut plane Cl11, the central undeformed region 2
It moves in the direction along the circumference centered around the connection edge fb with 3.

As a result, as shown in FIG. 3, the cut surface Cm on the non-forming area side is located below and outward in the width direction, and the side edge of the forming area 24 enters below the non-forming area. It becomes a state. Therefore, in the plan view seen from above in FIG. 3, since an overlapping portion is created between the molding region 24 and the non-forming region, both the metal plates 21 and 22 are separated from each other, that is, the upper metal plate 21 The forming area 24 of the lower metal plate 22 is no longer able to cause a relative movement of separating upwardly through both the cut surfaces Cm-Cm of the non-forming area,
As a result, a bonding structure is formed in which both metal plates 21 and 22 are bonded to each other.

In addition, in the above-mentioned joint structure, when the upper metal plate 21 can be caused to move upward and to the wider side, for example,
The forming area 24 of the upper metal plate 21 separates upward through the cut surfaces Cm-Cm of the lower metal plate 22, but in the above case, the wide end area of the forming area 24 is not formed. This connection region prevents movement toward the wider side with respect to the upper metal plate 21, and therefore cannot cause movement in the detachment direction as described above, so that the bonded state is maintained. Ru. In addition, in the above embodiment, two
The molding regions 24 are formed in pairs, and therefore, the above-mentioned movement in the detachment direction is mutually prevented, and the bonded state is maintained more reliably. Further, in the above bonding device, the above molding area 24 and
24 pairs are formed in a row for each recessed groove 5, that is, for each opening 6 in FIG. , a band-shaped joining area is provided.

In addition, as described above, the bending process of the forming area 24 is performed for each opening 6.
In order to make it possible to move downward and toward the center on the side where the hem widens in the width dimension when the opening is carried out in
As shown in the figure, the surface slopes outward in the width direction from the upper edge downward, with a relief angle θ from the vertical direction.

On the other hand, when the above molding is completed, each molding area 24, 2
4 from inside the opening 6, the width dimension at the upper edge of the opening 6 needs to be widened due to the widening side of the molding area 24 moving toward the center.
The opening 6 is formed by abutting two die-locked 1 against each other, and the die-locked 1 is configured to be movable in a direction away from each other. That is, after the forming of the forming area 24 is completed, the bunch 11
During the backward motion from the bottom dead center to the top dead center, the support blocks 2, 2 rise, thereby lifting both the metal plates 21, 22. At this time, when the side edges of the forming area 24 on both metal plates 21 and 22 rise while coming into contact with the inner circumferential surface of the die locked 1,
The die blocked 1 undergoes a movement movement in which it is pushed and spread by the molding areas 24. As a result, the mutually joined metal plates 21 and 22 are automatically taken out from the lower die unit during the backward motion of the bunch 11.

Note that the support block 7 has a pair of molding areas 24 and 24.
24, and it is possible to form the above-mentioned joint structure even without this. For example, when the material to be joined is a highly malleable material, the support block 7 is used to apply processing force to the end side during the forming process that starts from cutting from the wide end position in the forming area 24. When deformation occurs in which the center side is also pushed down, this deformation of the center side is suppressed,
The central undeformed area 23 is secured, and the molding areas 24 and 2 are
4 to give a predetermined tilt deformation. Also,
When using this support block 7, for safety,
A stopper block for regulating the bottom dead center position of the bunch 11 is interposed between the stripper plate 13 and the bunch plate 14, thereby preventing excessive pressing force from acting on the support block 7.

As described above, in the above embodiment, the overlapped metal plates 21 and 22 are joined to each other by providing an inclined surface with a flared bottom. Such a joint structure is created by cutting along two lines whose width gradually increases, and by bending the forming area between these cutting lines. Therefore, it is possible to form with a smaller processing force than the strong compression processing in the conventional method described above. This eliminates the need for a mold structure with high strength as in the prior art, and as a result, processing costs can be reduced. Furthermore, the above method can be applied to a wider range of materials without any restrictions on combinations such as having one of the materials to be joined be a highly malleable member as in the past. Furthermore, conventionally, for example, a burring caulking method or the like has been adopted for joining thin plate materials. In this method, a hole is drilled in one material to be welded, and a small diameter hole is drilled in the other material stacked on top of it at the location of the hole. The inner periphery of the hole is sandwiched,
In this case, a preforming process is required in which holes are made in advance in one of the materials to be joined. However, according to the above embodiment, there is no need to perform any preforming on the materials to be joined.
For this reason, the number of steps is fewer than in the above-mentioned methods, so processing costs can be lowered. Furthermore, in the above-mentioned burring caulking etc., a penetrating hole is unnecessarily left in the joint, which impairs safety, for example, but in the above embodiment, such an unnecessary through hole is left unnecessarily. Therefore, it can also be applied to thin plate materials used in areas that are restricted by safety standards.

In addition, in the joining device of the above embodiment, the lower edge portions 11b and 11b of both side edges function as cutting blades at the tip of the punch 11, and the inclined machined surface 1 has a wide hem shape.
1a is provided. As a result, when the punch 11 moves forward, the metal plates 21 and 22 have the lower edge portion 1.
At the same time as the cutting by 1b..., the inclined machined surfaces 11a, l
A bending process along la is performed. Furthermore, since the Gui block 1 is movable in the direction in which they are separated from each other, the molding area 24 formed during the forward movement of the Gui block 1 can be taken out from the opening 6 in the lower mold unit, as described above. This can also be carried out following the above molding without any problems. In this way, since forming and taking out can be performed in one stroke of the punch 11, that is, in a -stamping operation, the joining apparatus has high production efficiency.

It should be noted that various changes can be made to the mold structure in the above bonding apparatus, and FIGS. 12 to 20 show examples in which the lower mold unit is configured differently from the above. In these cases, it is assumed that punches 11 similar to those described above are arranged above each T-shaped unit in accordance with the positions of the respective openings 6.

First, the example shown in Figs. 12 to 14 (hereinafter referred to as the second
In the example), one opening 6 is formed for each pair of die blocks 1 that are butted against each other, and a lower die unit is constructed by arranging a plurality of these pairs in parallel. In this case, support blocks 2 are interposed between each month, and as shown in FIG. The bonding structure is formed on the materials to be bonded by forming the bonding structure in substantially the same manner as in the embodiment described above.

In still another embodiment (hereinafter referred to as the third embodiment) shown in FIGS. 15 to 17, almost the same as in the second embodiment, a guide block l with one opening 6 formed in each center is used. A plurality of pairs are arranged in parallel, and a support block 2... is interposed between each of these months. In addition, these support blocks 2...
As shown in Fig. 16, the push-up pins 28... which are slanted surfaces that narrow the width of the upper groove, abut against the guide blocks 1 on both sides, and pass through these support blocks 2 in the vertical direction. These push-up pins 28...
・Compression coil springs 3... are respectively disposed below. Due to the spring force of these compression coil springs 3..., the push-up pins 28... are held in a protruding position where their upper ends protrude upward from the upper surface of the Gui block 1, and at this time, the push-up pins 28... The lower end large diameter portion 29 of 28... comes into contact with the lower surface of the support block 2...
The spring force also acts on these support blocks 2 as an upward pushing force. Thereby, each die locked 1 is held in a close contact position where they are in close contact with each other.

Then, the materials to be welded are placed on each of the push-up pins 28, and as the punch 11 moves downward, the push-up pins 28... When pushed down against the force, the support block 2
... is the lower end large diameter portion 29 of the push-up pin 28...
As a result, it is in a state where it can freely move downward to a position where it comes into contact with this lower end large diameter portion 29. Therefore, the pressing force on each die locked 1 in the center direction is released.

In this state, the above-mentioned welding process is performed, and when the welding material is taken out from the opening 6 upward after the process is completed, the pressing force toward the center is released as described above. As a result, each die locked 1 moves in a direction away from each other, and the material to be welded is taken out.

Note that when the above ejecting operation is completed, that is, when each push-up pin 28... returns to its upper end position,
The die locked 1 shown in FIG. 15 automatically returns to the initial state in which they are in close contact with each other.

On the other hand, in still other embodiments shown in FIGS. 18 to 20, the response action required when taking out the workpiece from the opening 6 is the sliding movement on the fixed bed 4 in each of the above embodiments. Unlike the above, the configuration is such that movement in the rotational direction occurs in the die locked 1. That is, almost similarly to the third embodiment, a plurality of pairs of Guibloc blocks 1 are arranged side by side, and in this case, the support block is not provided between each pair, and a gap is provided between each pair. Each die locked . . . is connected to the fixed bed 4 side via connection bins 30 . . . at both ends in the vertical direction in FIG. That is, each die block 1 has connection pins 30 and 3 corresponding to the vertical direction in FIG.
It is configured to be able to rotate with a straight line connecting 0 as the axis of rotation.

In this configuration, when the lower surface of each die locked is positioned in close contact with the fixed bed 4, the material to be welded is formed, and when the material to be welded is taken out, , the end face on the side of each opening 6 in each die locked... moves upward around the rotation axis and also moves along the circumference in a widening manner, making it possible to take out the material to be welded. It is said that In this case, the biasing force of the spring is not applied to the die-locked..., and the push-up pin 2, which is provided between each pair of die-locked blocks 1 in substantially the same manner as in the third embodiment, is applied.
The structure is such that only a pushing force is applied to 8....

In each of the above embodiments, a metal plate was used as an example of the material to be joined, but other materials such as synthetic resin plates can also be joined by the joining method and joining apparatus of the present invention. be. Further, in each of the above embodiments, an apparatus configuration was shown in which a plurality of bonding structures arranged in a - row were simultaneously formed, but the arrangement of these bonding structures can be changed as appropriate. It is also possible to use an apparatus configuration in which the structure is located in one location, and to combine this with an automatic feeder for workpieces or the like to form other configurations such as sequentially forming bonding structures.

〔Effect of the invention〕

As described above, the method for joining thin plate materials according to claim 1 of the present invention starts from one surface of a plurality of thin plate materials stacked on top of each other and gradually spreads out two thin plates that are spaced apart from each other on the surface. In addition to cutting along the line, the forming area between the two cutting lines is given bending deformation in the rotational direction with the smaller dimension between the two cutting lines as a fulcrum, and this forming area is moved outside of the above two cutting lines. It is intended to be tilted with respect to the other area.

As a result, the joining structure is formed by cutting and bending, so that molding can be performed with less processing force than in the past. As a result, it is not necessary to have a mold structure with high strength as in the past (therefore, the processing cost can be lowered).

In addition, in the conventional method, there were restrictions on the combination such that one of the materials to be joined had greater ductility, but the above method does not have this restriction, and therefore can be used in a wider range. The present invention has the advantage that it can be applied to a wide range of materials to be joined.

Further, the joining device for thin plate materials according to claim 2 of the present invention includes a female die having an opening for forming processing, and a tip that moves back and forth relatively in the direction of the female die so that the tip enters and exits the opening. A punch is provided at the tip of the punch, and the tip of the punch has an inclined machined surface whose width increases from one side to the other and which slopes so that the longer side in the width direction is located closer to the tip than the short side. is formed, and both edges of the inclined machined surface in the width direction fit into the opening to function as cutting edges, while the female die is composed of a split die divided by a plane passing through the opening. , in response to a lateral pushing force from the materials to be welded within the opening, the divided dies are configured to move in a direction in which they are separated from each other.

As a result, during the forward movement, the workpiece is simultaneously cut along both edges of the inclined surface and bent and formed in the forming area between the cutting lines along the inclined surface. Then, the bonding structure is formed. Furthermore, the operation of taking out from the opening of the female die a molded area whose width has apparently expanded wider than the width at the time of cutting from the opening of the female die can also be performed using a female die with a split configuration. By causing the die to move in the direction of widening the width of the opening, the movement can be performed in conjunction with the backward motion of the punch, for example. As a result, for example, the above-mentioned molding and taking out can be performed in one stroke of the punch, that is, in a -stamping operation, so that it is possible to provide an apparatus configuration with high production efficiency.

[Brief explanation of drawings]

1 to 11 show an embodiment of the present invention. FIG. 1 is a perspective view showing the shape of a joining structure formed on two metal plates as materials to be joined. FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1. FIG. 3 is a plan view showing the shape of the joining structure. FIG. 4 is a plan view of the lower mold unit in the joining apparatus. FIG. 5 is a sectional view taken along the line ■--■ in FIG. 4. FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 4. FIG. 7 is an enlarged plan view of essential parts showing the shape of the opening in the lower die unit. FIG. 8 is a sectional view showing the wall shape of the opening in the lower die unit. FIG. 9 is a sectional view showing a mold configuration consisting of the lower mold unit and an upper mold unit disposed above the lower mold unit. FIG. 10 is a bottom view of the punch in the upper die unit. FIG. 11 is a sectional view showing the process of joining two metal plates by the above-mentioned joining apparatus. 12 to 14 show other embodiments. FIG. 12 is a plan view of the lower die unit. FIG. 13 is a sectional view taken along the line XI-XI of FIG. 12. FIG. 14 is a sectional view taken along the line XIV-XIV in FIG. 12. FIGS. 15 to 17 show still other embodiments. FIG. 15 is a plan view of the lower die unit. FIG. 16 is a sectional view taken along the line XVI-XVI in FIG. 15. FIG. 17 is a sectional view taken along the line X--X in FIG. 15. FIGS. 18 to 20 show still other embodiments. FIG. 18 is a plan view of the lower die unit. FIG. 19 is a sectional view taken along the line XIX-XIX in FIG. 18. FIG. 20 is a sectional view taken along the line ■X--■ in FIG. 18. 21 to 23 show conventional examples. FIG. 21 is a schematic cross-sectional view showing the process of joining two metal plates. FIG. 22 is a perspective view showing the shape of a joining structure formed on two metal plates. FIG. 23 is a sectional view taken along the line nxm-nxm in FIG. 22. 2 is a Gui block (divided die), 6 is an opening, 11 is a punch, lla is an inclined processing surface, 21 and 22 are metal plates (thin plate materials), and 24 is a forming area.

Claims (1)

[Claims] 1. From one surface of a plurality of thin plate materials stacked on top of each other, a cut is made along two lines that are spaced apart from each other and gradually widen on that surface, and a cut is made between the two cut lines. A bending deformation is applied to the molding region in the rotational direction using the smaller side between the two score lines as a fulcrum, so that the molding region is inclined with respect to the region outside the two score lines. How to join thin plate materials. 2. A female die having an opening for forming processing, and a punch that reciprocates relatively in the direction of the female die and whose tip enters and exits the opening are provided, and the tip of the punch has a width dimension An inclined machined surface is formed that expands from one side to the other side and is inclined so that the longer side in the width direction is located closer to the tip than the shorter side, and this inclined machined surface is formed on both sides in the width direction. The edge fits into the aperture to function as a cutting edge, while the female die consists of a segmented die divided in a plane passing through the aperture, and the lateral pushing force from the workpiece in the aperture 1. A joining device for thin plate materials, characterized in that each divided die moves in a direction to separate from each other in accordance with the above.