JP2021159952A - Press working device and press working method using the device - Google Patents

Abstract

To provide a press working device and a press working method which can apply bending processing to a flange part with high accuracy and stability, without causing poor molding such as burr.SOLUTION: A press working device 30 comprises: an upper mold 31 and a lower mold 32 which hold a work-piece main body W13; and a bending processing mold 34 having a bending processing surface 35 that moves relatively in a direction in which the mold approaches the upper mold 31 to contact a tip part W21a of a flange part W21 protruding obliquely downward so as to apply bending processing to the flange part W21 in order to reduce a bending angle θ1 thereof. The bending processing mold 33 is provided with a regulating surface 34 that contacts the tip part 21a of the flange part W21 in the step of bending the flange part W21 to regulate the tip part W21a moving in a horizontal direction.SELECTED DRAWING: Figure 7

Description

The present invention relates to a press working apparatus and a press working method using the press working apparatus, and more particularly to a technique for bending a flange portion provided on one end side of a plate-shaped workpiece.

Some structural parts of automobiles are obtained by bending a plate material a plurality of times, such as a U-shaped cross section or a U-shaped cross section. As a method for molding a structural part having such a cross-sectional shape, for example, there is a press molding method described in Patent Document 1 and Patent Document 2.

In each of the press molding methods described in Patent Documents 1 and 2, in the intermediate molding step, a flange portion in a bent or curved state is formed in advance on one end of the plate-shaped work, and the flange portion is formed. After that, in the final bending step, a bent portion or a curved portion is newly provided between the flange portion and the plate-shaped work by press forming, so that the flange portion can be folded back to the plate-shaped work side.

Japanese Unexamined Patent Publication No. 11-226648 Japanese Unexamined Patent Publication No. 2014-108429

By the way, in recent years, there has been an increasing demand for higher rigidity and lighter weight for this type of structural component, and for this reason, for example, it is necessary to further complicate or improve the cross-sectional shape of this type of structural component. The current situation is that it is increasing. In the case of the press molding method described in Patent Document 1 and Patent Document 2, in the final bending step, molding is performed without a mold inside the flange portion, so that the degree of freedom of the moldable shape is increased, while the hollow state is increased. Since the molding proceeds as it is, there is a problem that the shape after molding is not stable.

Therefore, for example, a press working method using the press working apparatus 100 shown in FIG. 11 can be considered. In this press working apparatus 100, the work body 101 having a plate shape, the intermediate bending portion 102 having a shape in which one end of the work main body 101 is bent, and one end side of the intermediate bending portion 102 are bent so as to be folded back toward the work main body 101 side. This is for performing a predetermined bending process on the intermediate work 104 having the shape flange portion 103 integrally. In this case, the bending angle θ0 (inner angle) of the flange portion 103 of the intermediate work 104 with respect to the intermediate bending portion 102 is in an obtuse angle. Here, the press working apparatus 100 is provided adjacent to the upper die 105 and the lower die 106 for holding the work main body 101, and the lower die 106, and protrudes diagonally downward by the relative movement in the direction approaching the upper die 105. It has a bending die 107 that performs bending processing to reduce the bending angle of the flange portion 103 by abutting with the tip portion 103a of the flange portion 103. In this case, the side surface 106a of the lower die 106 comes into contact with the tip 103a in the process of the flange 103 being pushed upward by the bending die 107 to regulate the horizontal movement of the tip 103a. Acts as a surface (see FIG. 12). By arranging the side surface 106a at a predetermined position with respect to the bending die 107 so that the side surface 106a of the lower die 106 can function as a regulating surface of the flange portion 103, the flange portion 103 is on the work body 101 side. The corner portion 108 is formed by being bent so as to be folded back and deformed so that the base end portion 103b of the flange portion 103 projects outward (see FIG. 13).

In the press working method described above, the flange portion 103 is bent while abutting the tip portion 103a of the flange portion 103 against the bending die 107 and then the side surface 106a of the lower die 106, so that the corner portion 108 (see FIG. 13) is used. ), A compressive force in a direction that causes the base end portion 103b of the flange portion 103 to project outward can be applied. Therefore, the flange portion 103 and the corner portion 108 having a stable shape can be formed as compared with the conventional processing means. However, even when the press working apparatus 100 having the above configuration is used, the following problems occur. That is, in the press working apparatus 100 having the above configuration, since the positional relationship between the upper die 105 and the lower die 106 and the work body 101 is constant during the press working, for example, the bending die 107 is set as a movable die and directed toward the upper die 105. After the tip portion 103a of the flange portion 103 comes into contact with the side surface 106a of the lower mold 106, the flange portion 103 is bent while sliding on the side surface 106a (FIG. 12). State indicated by the alternate long and short dash line). In this case, the tip portion 103a is heavily worn, and there is a possibility that a molding defect called burrs may occur on the tip portion 103a after molding.

In view of the above circumstances, the present specification provides a press working apparatus and a press working method capable of performing stable bending of a flange portion with high accuracy without causing molding defects such as burrs. It is a technical issue to be solved.

The solution to the above problems is achieved by the press working apparatus according to the present invention. That is, this processing device has a plate-shaped work body, an intermediate bent portion having a shape in which one end side of the work body is bent, and a flange portion having a shape in which one end side of the intermediate bent portion is bent toward the work body. It is a press processing device for performing bending work to reduce the bending angle on the flange part of the intermediate work which is integrally held and the bending angle of the flange part with respect to the intermediate bending part is blunt, and holds the work body. Bending that reduces the bending angle of the flange by contacting the tip of the flange that protrudes diagonally downward by moving relative to the upper and lower molds in a direction approaching the upper mold. The bending die is provided with a bending die having a surface, and the bending die is provided with a regulating surface that comes into contact with the tip of the flange in the process of bending the flange and regulates the horizontal movement of the tip. Characterized by dots. The bending angle referred to here means an angle (angle on the side less than 180 °) formed by the intermediate bending portion and the flange portion in the cross section of the connecting portion between the intermediate bending portion and the flange portion. In addition, "upper", "lower", and "horizontal" here mean the relative positional relationship between the upper die, the lower die, and the bending die, and "upper" and "lower" are not necessarily along the vertical direction. The orientation is not limited.

As described above, in the press working apparatus according to the present invention, an upper die and a lower die for holding the plate-shaped work body are provided, and the bending angle with respect to the intermediate bending portion is obtuse angle separately from the upper die and the lower die. A bending die having a bending surface for performing a predetermined bending process is further provided on the flange portion. In addition to this, the bending die is provided with a regulating surface that comes into contact with the tip of the flange in the process of bending the flange and regulates the horizontal movement of the tip. For example, as a difference (improvement) from the press working apparatus 100 shown in FIG. 11, the press working apparatus according to the present invention has a regulatory surface that regulates the horizontal movement of the tip of the flange portion. It is provided not in the lower mold that holds the work body, but in the bending mold that bends the flange. According to the press working apparatus according to the present invention, the flange portion is pushed up by the bending surface of the bending die and bent toward the work body, so that the tip end portion of the flange portion and the bending surface are always the same up and down. It is in the directional position. Here, since the regulation surface is provided in the same mold as the bending surface, the regulation surface and the bending surface are always in the same vertical position during bending. As a result, during bending, the tip of the flange and the regulation surface are always kept in the same vertical position, so even after the tip of the flange comes into contact with the regulation surface, the tip of the flange is regulated. Horizontal movement is restricted by the surface. Therefore, it is possible to stably perform high-quality bending while avoiding the situation where the tip of the flange portion is worn. Further, since the tip portion of the flange portion is maintained at a constant position with respect to the bent surface and the regulation surface after reaching the regulation surface, the compressive force applied to the flange portion can be stabilized. Therefore, it is possible to form the corner portion formed by projecting the base end portion of the flange portion outward into a stable shape.

Further, the solution of the above problems is also achieved by a press working method using the press working apparatus according to the present invention. Further, in this case, in the press working method according to the present invention, the base of the flange portion is based on the length dimension from the base end portion to the tip end portion of the flange portion and the relative movement amount of the bending die with respect to the upper die. The radius of curvature of the corner formed at the end may be adjusted.

As described above, according to the press working apparatus according to the present invention, bending of the flange portion to be molded can be performed with high accuracy without molding defects, and a corner portion having a stable shape is formed at the base end of the flange portion. be able to. Here, as a result of the present inventors examining the shape of the corner portion when performing the above-mentioned press working using the press working apparatus according to the present invention, in particular, the length from the base end portion to the tip end portion of the flange portion. It was found that the dimensions, the amount of relative movement of the bending die with respect to the upper die, and the horizontal position of the regulation surface greatly affect the shape of the corners, especially the size of the radius of curvature. Therefore, among the above-mentioned factors, if the shape of the corner portion is set with the length dimension of the flange portion and the relative movement amount of the bending die as parameters, the shape of the corner portion can be easily controlled without trouble. Become.

As described above, according to the present invention, it is possible to provide a press working apparatus and a press working method capable of performing stable bending of a flange portion with high accuracy without causing molding defects such as burrs. It becomes.

It is a figure which showed typically the flow of the manufacturing method of the pressed product which concerns on one Embodiment of this invention. It is sectional drawing of the apparatus for performing the first bending process on the blank material shown in FIG. It is a figure for demonstrating an example of bending processing using the 1st bending processing apparatus shown in FIG. It is sectional drawing of the apparatus for performing the 2nd bending process on the 1st intermediate work shown in FIG. It is a figure for demonstrating an example of bending processing using the 2nd bending processing apparatus shown in FIG. It is sectional drawing of the apparatus for carrying out the press working which concerns on this invention on the 2nd intermediate work shown in FIG. It is a figure for demonstrating an example of press working using the press working apparatus shown in FIG. It is a figure for demonstrating an example of press working using the press working apparatus shown in FIG. FIG. 5 is an enlarged view showing a portion indicated by an arrow A in FIG. It is a table for demonstrating the influence which each parameter has on the shape of the flange part including a corner part in the press working using the press working apparatus shown in FIG. It is sectional drawing of the press working apparatus which concerns on comparison with this invention. It is a figure for demonstrating an example of the press working method using the press working apparatus shown in FIG. It is a figure for demonstrating an example of the press working method using the press working apparatus shown in FIG.

Hereinafter, the contents of the press working apparatus according to the embodiment of the present invention and the press working method using this apparatus will be described with reference to the drawings. In the present embodiment, a case where the lower arm as a structural part for a vehicle is manufactured as a pressed product will be described below as an example.

FIG. 1 is a diagram schematically showing a flow of a method for manufacturing a stamped product according to an embodiment of the present invention. As shown in FIG. 1, in the method for manufacturing a pressed product according to the present embodiment, the blank material W0 is subjected to a predetermined bending process (first bending process) to obtain a first intermediate work W1. A processing step S1 and a second bending process S2 for obtaining a second intermediate work W2 by performing a predetermined bending process (second bending process) on the first intermediate work W1 obtained in the first bending process S1. , The second intermediate work W2 obtained in the second bending step S2 is subjected to a predetermined bending process (third bending process) by press working to obtain a pressed product W as the third intermediate work. It includes a processing step S3. Here, the third bending step S3 corresponds to the press working method according to the present invention, and the press working apparatus 30 (see FIG. 6 described later) used in this press working step corresponds to the press working apparatus according to the present invention. Corresponds to. Hereinafter, the details of each of the steps S1 to S3 will be described in order.

(S1) First Bending Process In this step, for example, a flat blank material W0 is subjected to a predetermined bending process by using the press processing device 10 shown in FIG. Here, the press working apparatus 10 shown in FIG. 2 is provided adjacent to the upper die 11 and the lower die 12 for holding the blank material W0 and the upper die 11 and is held by the upper die 11 and the lower die 12. The blank material W0 is provided with bending dies 13 and 14 for performing a predetermined bending process.

The bending process using the press processing device 10 having the above configuration is performed, for example, as follows. First, as shown in FIG. 2, the blank material W0 is held by the upper mold 11 and the lower mold 12 in a state where one end side W0a and the other end side W0b of the blank material W0 are squeezed out, respectively. After that, the bending molds 13 and 14 adjacent to the upper mold 11 are lowered, respectively, and one end side W0a and the other end side of the blank material W0 are started from the boundary between each bending mold 13 and 14 and the upper mold 11. Bend each W0b downward. As a result, as shown in FIG. 3, the first intermediate bent portion W11 in which one end side W0a of the blank material W0 is bent, and the second intermediate bent portion W12 in which the other end side W0b of the blank material W0 is bent. The first intermediate work W1 having the above is molded.

(S2) Second Bending Process In this step, the press processing apparatus 20 shown in FIG. 4 is used to perform a predetermined bending process on the first intermediate work W1 obtained through the first bending process S1. Here, the press working apparatus 20 shown in FIG. 4 is adjacent to the upper die 21 and the lower die 22 holding the work body W13 of the first intermediate work W1 and the lower die 22, and is the first of the first intermediate work W1. A slide die 23 arranged inside the intermediate bending portion W11 and a bending die 24 located below the first intermediate bending portion W11 and performing a predetermined bending process on the first intermediate bending portion W11 are provided.

Here, a pair of bending surfaces 24a and 23a corresponding to the shape of one end side W11a of the first intermediate bending portion W11 after bending are provided on the upper portion of the bending mold 24 and the lower portion of the slide mold 23, respectively. ing. The pair of bent surfaces 24a and 23a are arranged at positions facing each other in the vertical direction. Further, each of the bending surfaces 24a and 23a is set in a form corresponding to the flange portion W21 formed on one end side W11a of the first intermediate bending portion W11 at the end of the second bending processing step S2 (FIG. 5). reference).

Bending using the press working apparatus 20 having the above configuration is performed, for example, as follows. First, as shown in FIG. 4, the work body W13 of the first intermediate work W1 is held by the upper die 21 and the lower die 22. In this state, the bending die 24 is arranged below the first intermediate bending portion W11. After that, the bending die 24 is raised, and the bending surface 24a is pressed against the tip of the first intermediate bending portion W11 extending downward. Since the bending surface 24a is inclined here, the tip of the first intermediate bending portion W11 receives a pushing bending force in the direction along the bending surface 24a, that is, toward the lower mold 22 side. As a result, bending processing is performed on one end side W11a of the first intermediate bending portion W11. In this bending example, in the illustrated example, the bending die 24 is raised to a position where the one end side W11a pressed and bent by the bending surface 23a of the slide die 23 and the bending surface 24a of the bending die 24 is sandwiched. It is done by letting. As described above, as shown in FIG. 5, the second intermediate work W2 having the flange portion W21 having a bent end side W11a of the first intermediate bent portion W11 is formed. Here, the bending angle θ1 of the flange portion W21 with respect to the first intermediate bending portion W11 is set in the range of an obtuse angle (90 ° <θ1 <180 °).

The molded second intermediate work W2 is removed from the lower mold 22 and the slide mold 23 by sliding the slide mold 23 toward the lower mold 22. The slide operation of the slide type 23 may be performed automatically with the mold opening operation, or may be performed by an independent drive device.

(S3) Third Bending Process In this step, the press processing device 30 shown in FIG. 6 is used to perform a predetermined bending process on the second intermediate work W2 obtained through the second bending process S2. Here, the press working apparatus 30 shown in FIG. 6 is provided adjacent to the upper die 31 and the lower die 32 holding the work body W13 of the second intermediate work W2 and the lower die 32, and approaches the upper die 31. A bending die 33 that performs bending to reduce the bending angle θ1 with respect to the flange portion W21 by relative movement in the direction, and a bending die 33 that is provided on the bending die 33 to move the tip portion W21a of the flange portion W21 in the horizontal direction. It has a regulatory surface 34 to regulate.

Of these, the bending die 33 is arranged below the flange portion W21, and by moving relative to the upper die 31, it comes into contact with the tip portion W21a of the flange portion W21 in a state of projecting diagonally downward. The flange portion W21 has a bending surface 35 that is bent to reduce the bending angle θ1. That is, the bending die 33 is configured to be able to move up and down independently of the upper die 31 and the lower die 32. In the present embodiment, the bent surface 35 has a shape extending in the horizontal direction. Therefore, as described above, the bending angle θ1 is reduced by abutting on the tip portion W21a of the flange portion W21 in a state of being inclined in the direction of shifting toward the lower mold 32 as the bending die 33 rises and moves downward. The flange portion W21 is pushed and bent in such a direction. In other words, the form of the bent surface 35 is arbitrary as long as the flange portion W21 is pushed and bent in the direction in which the flange portion W21 comes into contact with the tip portion W21a of the flange portion W21 and is folded back toward the work body W13 due to the ascent of the bending die 33. It does not necessarily have to extend in the horizontal direction. Therefore, not limited to the illustrated example, the bent surface 35 can allow a certain degree of inclination (10 °) with respect to the horizontal direction. Alternatively, the bent surface 35 may allow a shape other than a completely flat shape (at least a shape having a partially curved shape, a shape composed of a plurality of planes having different inclination angles from each other, etc.).

The regulation surface 34 is provided on the bending die 33. In the present embodiment, the regulation surface 34 is provided at the end of the bent surface 35 on the lower mold 32 side, and has a shape extending upward. Specifically, the regulation surface 34 has a shape that extends linearly in a direction along the moving direction of the bending die 33. The regulation surface 34 is configured to come into contact with the tip end portion W21a of the flange portion W21 in the process of bending the flange portion W21 by the bending die 33. In other words, according to the length dimension L (distance from the base end portion W21b to the tip end portion W21a) of the flange portion W21 to be bent, the horizontal position of the regulation surface 34 in the bending die 33, to be exact. The horizontal position of the regulation surface 34 with reference to the position where the tip portion W21a of the flange portion W21 abuts on the bent surface 35 is set within a predetermined range. Therefore, in this case, the horizontal distance of the bent surface 35 is also set within a predetermined range according to the length dimension of the flange portion W21.

Next, an example of bending processing using the press processing apparatus 30 having the above configuration will be described with reference to FIGS. 6 to 9.

First, as shown in FIG. 6, the work body W13 of the second intermediate work W2 is held by the upper die 31 and the lower die 32. In this state, the first intermediate bending portion W11 and the flange portion W21 are in a state of protruding from the upper mold 31 and the lower mold 32, and the flange portion W21 is inclined and protrudes toward the lower mold 32 as it goes downward. It is in a state. Further, the bending die 33 is located below the flange portion W21. In FIG. 6, although the flange portion W21 is in contact with the tip portion W21a, it may be located at a position downward from the tip portion W21a. Then, from the above-mentioned state, the bending die 33 is raised, and the bending surface 35 is pressed against the tip portion W21a of the flange portion W21 in a state of projecting diagonally downward. As a result, the flange portion W21 is pushed and bent in a direction that reduces the bending angle θ1, so that the tip portion W21a of the flange portion W21 moves toward the lower die 32 as the bending die 33 rises.

Here, a regulation surface 34 is provided at one end of the bent surface 35 (the end on the lower mold 32 side). Therefore, in the process of bending the flange portion W21 as described above, the tip portion W21a of the flange portion W21 comes into contact with the regulation surface 34 (see FIG. 7). By continuing to raise the bending die 33 from this state, the bending of the flange portion W21 further progresses (the state shown by the alternate long and short dash line in FIG. 7). On the other hand, since the tip portion W21a of the flange portion W21 is in a state where the movement in the horizontal direction is restricted by the regulation surface 34, when the bending processing mold 33 is used as a reference, when the bending processing of the flange portion W21 progresses. However, the positions of the tip portion W21a with respect to the regulation surface 34 and the bent surface 35 do not change (the state indicated by the alternate long and short dash line in FIG. 7). Therefore, the bending process of the flange portion W21 can be continued while preventing the tip portion W21a from being worn or locally deformed due to sliding with the regulation surface 34.

Bending of the flange portion W21 is continued as described above, and bending is performed when, for example, the amount of increase (stroke position) H from the bending start position of the bending die 33 shown in FIG. 6 reaches a predetermined size. Stop the ascent of the machining die 33 (see FIG. 8). Then, the upper die 31 is raised and the second intermediate work W2 after bending is taken out from the bending apparatus 30. As a result, as shown in FIG. 8, a pressed product W in a state in which the bending angle θ1 of the flange portion W21 with respect to the first intermediate bending portion W11 is reduced to a predetermined size (bending angle θ2 after bending) is obtained. Be done. Further, by bending the flange portion W21 as described above, the base end portion W21b of the flange portion W21 is deformed so as to project outward, and a corner portion W31 having a predetermined shape is formed (FIG. 9-2). Transformed from the state shown by the dotted line to the state shown by the solid line).

FIG. 9 shows an enlarged view of a main part of the pressed product W obtained through the third bending process S3. As shown in FIG. 9, as a result of bending the flange portion W21 in the above step S3, a corner portion W31 having a predetermined shape is formed between the flange portion W21 and the first intermediate bending portion W11. Here, the corner portion W31 has an R-shaped cross section as a whole and has a predetermined radius of curvature r1. Further, the bending angle θ2 of the flange portion W21 with respect to the first intermediate bending portion W11 in the pressed product W is naturally smaller than the bending angle θ1 (see FIG. 6) of the second intermediate work W2, for example, a size close to 90 °. (90 ° <θ2 <100 °).

Here, the radius of curvature r1 of the corner portion W31 and the final bending angle θ2 of the flange portion W21 can be controlled by the following three factors. That is, as described above, when the second intermediate work W2 in which the bending angle θ1 is obtuse is subjected to the bending process for reducing the bending angle θ1 by using the press processing device 30 having the configuration shown in FIG. 6, the flange portion W21 The length dimension L from the base end portion W21b to the tip end portion W21a, the amount of rise (stroke position) H of the bending die 33 with respect to the upper die 31, and the horizontal position of the regulation surface 34 are the shapes of the corner portions W31. In particular, it has been found that the size of the radius of curvature r1 is greatly affected. Therefore, if the shape of the corner portion W31 is set with the length dimension L of the flange portion W21 and the stroke position H of the bending die 33 as parameters among the above-mentioned three factors, the press working apparatus 30 needs to be significantly changed. It is possible to easily and inexpensively control the radius of curvature r1 of the corner portion W31.

FIG. 10 shows the relationship between the above-mentioned length dimension L, the stroke position H, and the radius of curvature r1. As shown in FIG. 10, for example, by making the length dimension L of the flange portion W21 relatively short, the radius of curvature r1 of the corner portion W31 tends to increase. On the contrary, by making the length dimension L relatively long, the radius of curvature r1 tends to be small. It is presumed that this is because the magnitude of the length dimension L is directly linked to the magnitude of the compressive force acting on the base end portion W21b of the flange portion W21 which is the corner portion W31. Further, by making the stroke position H of the bending die 33 relatively low, the radius of curvature r1 of the corner portion W31 tends to be large. On the contrary, by making the stroke position H relatively high, the radius of curvature r1 tends to be small. It is presumed that this is also because the magnitude of the stroke position H is directly linked to the magnitude of the compressive force acting on the base end portion W21b. Further, since the stroke position H also affects the bending angle θ2 of the flange portion W21 after the third bending step S3, for example, as shown in FIG. 10, by making the stroke position H relatively low, The bending angle θ2 tends to be relatively large, and the bending angle θ2 tends to be relatively small by making the stroke position H relatively high. Based on the above tendency, by setting the length dimension L and the stroke position H of the flange portion W21, it is possible to easily control the shape of the corner portion W31 and the final bending angle θ2.

As described above, according to the press working apparatus 30 according to the present embodiment, the flange portion W21 is pushed up by the bending surface 35 of the bending die 33 and gradually bent toward the work body W13. The tip portion W21a of the flange portion W21 and the bent surface 35 are always at the same vertical position. Here, since the regulation surface 34 is provided on the bending mold 33 together with the bending surface 35, the regulation surface 34 and the bending surface 35 are always in the same vertical position during the bending process. As a result, during the above-mentioned bending process, the tip portion W21a of the flange portion W21 and the regulation surface 34 are always maintained at the same vertical position, so that even after the tip portion W21a of the flange portion W21 comes into contact with the regulation surface 34. , The tip portion W21a of the flange portion W21 is restricted from moving in the horizontal direction by the regulation surface 34. Therefore, it is possible to stably perform high-quality bending while avoiding a situation in which molding defects such as burrs occur on the tip portion W21a of the flange portion W21. Further, since the tip portion W21a of the flange portion W21 is maintained at a constant position with respect to the bent surface 35 and the regulation surface 34 after reaching the regulation surface 34, the compressive force applied to the flange portion W21 is stabilized. Can be done. Therefore, the corner portion W31 formed by projecting the base end portion W21b of the flange portion W21 to the outside can be formed into a stable shape.

Although one embodiment of the present invention has been described above, the press working apparatus according to the present invention and the press working method using this apparatus can adopt a configuration other than the above as long as the purpose is not deviated. ..

For example, in the above embodiment, the regulation surface 34 is provided at the end of the bending surface 35 on the lower die 32 side, and has a shape that extends linearly upward in the direction along the moving direction of the bending die 33. (See FIG. 6), but of course it is not limited to this shape. The regulation surface 34 as long as the tip W21a does not get over the regulation surface 34 to the lower mold 32 side after contacting the tip W21a of the flange W21 in the process of bending the flange W21 by the bending mold 33. The position, shape, or size of the can be set arbitrarily.

Further, in the above embodiment, a case where the bending die 33 is raised with the upper die 31 and the lower die 32 as the fixed side and the bending die 33 as the movable side during press working by the press working device 30 has been illustrated, but of course. It is also possible to take other forms. That is, even if the flange portion W21 is subjected to the above-mentioned bending process by integrally lowering the second intermediate work W2 with the bending die 33 as the fixed side and the upper die 31 and the lower die 32 as the movable side. good.

Further, in the above embodiment, the cases where the press processing devices 10 and 20 shown in FIGS. 2 and 4 are used in the first bending process S1 and the second bending process S2, respectively, are illustrated, but of course, by other means. The blank material W0 and the first intermediate work W1 may be subjected to a predetermined bending process. That is, as long as the second intermediate work W2 in the form shown in FIG. 6 can be obtained, the means and configuration for obtaining the second intermediate work W2 are arbitrary, and the second intermediate work W2 can be obtained by means other than press working. May be good. Further, it is not necessary to obtain the second intermediate work W2 by deforming the blank material W0 in the order shown in FIG. 1, and for example, the second intermediate work W2 in the form shown in FIG. You may try to get it.

Further, in the above embodiment, the case where the lower arm for automobiles is manufactured as a stamped product W has been illustrated, but of course, the present invention can be applied to the manufacture of structural parts for vehicles other than the lower arm. That is, the present invention can be applied to the manufacture of arbitrary vehicle structural parts and, by extension, general structural parts, as long as the parts are composed of plate-shaped members as a whole and have a cross-sectional shape in which the flange portion is folded back. be.

10 Pressing device 11 Upper die 12 Lower die 13, 14 Bending die 20 Pressing device 21 Upper die 22 Lower die 23 Slide die 24 Bending die 23a, 24a Bending surface 30 Pressing device 31 Upper die 32 Lower die 33 Bending die 34 Restricted surface 35 Bending surface 100 Press working device 101 Work body 102 Intermediate bending part 103 Flange part 103a Tip part 104 Intermediate work 105 Upper type 106 Lower type 106a Side surface 107 Bending type 108 Corner part H Stroke position L length Dimensions r1 Radius of curvature W Pressed product W0 Blank material W1 First intermediate work W11 First intermediate bending part W12 Second intermediate bending part W13 Work body W2 Second intermediate work W21 Flange part W21a Tip part W21b Base end part W31 Corner part θ0, θ1, θ2 Bending angle

Claims (2)

It integrally has a plate-shaped work body, an intermediate bent portion having a shape in which one end side of the work body is bent, and a flange portion having a shape in which one end side of the intermediate bent portion is bent toward the work body. A press working apparatus for performing a bending process for reducing the bending angle on the flange portion of the intermediate work whose bending angle of the flange portion with respect to the intermediate bending portion is obtuse.
The upper and lower molds that hold the work body,
By moving relative to the upper mold, it has a bent surface that comes into contact with the tip of the flange portion that protrudes diagonally downward and bends the flange portion to reduce the bending angle. Equipped with a bending mold,
A press working apparatus in which the bending die is provided with a regulating surface that comes into contact with the tip of the flange in the process of bending the flange and restricts the movement of the tip in the horizontal direction. A press working method using the press working apparatus according to claim 1.
The radius of curvature of the corner portion formed on the base end portion of the flange portion based on the length dimension from the base end portion to the tip end portion of the flange portion and the relative movement amount of the bending die with respect to the upper die. To adjust, press working method.

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