JPH0379092B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a press die, and particularly to a press die suitable for deep groove bending of the edge of a plate-shaped workpiece.

2. Description of the Related Art For example, conventionally, an edge portion 2 of a workpiece 1, which is the outer panel of a front door of an automobile, as shown in FIG. 3, is bent into an L-shaped cross section as shown in FIG. FIG. 5 schematically shows a conventional press mold a used for bending and forming the edge portion 2 of the workpiece 1. As shown in FIG. In the drawing, 3 is a lower mold holder, 4 is a fixed mold installed at a fixed position on the lower mold holder 3, and into which an upper mold (not shown) is removably fitted. A punch 6 protruding outward is formed on the periphery of the placing surface 5, and a cross section L consisting of a horizontal surface 7a and a vertical surface 7b is formed on the lower surface side of the punch 6.
A bent surface 7 having a letter-shaped shape is formed. 8 is a slide plate arranged on the lower mold holder 3 and adjacent to the outside of the fixed mold 4; 9 is a horizontal surface 7a of the bent surface 7 of the fixed mold 4 on the slide plate 8;
A cam slide installed so as to be able to reciprocate in a straight line in the direction along the cam slide 9. A die 10 that abuts the bent surface 7 is formed at the tip of the cam slide 9, and
An inclined surface 11 is formed at the rear. A cam driver 12 is disposed above the support plate 8 so as to be movable up and down.A cam surface 13 is formed at the lower end of the cam driver 12 to make sliding contact with the inclined surface 11 of the cam slide 9.

When bending and forming the edge portion 2 of the work 1 into an L-shaped cross section, the work 1 is first bent as shown by the dashed line in FIG. After drawing, the end edge 2 of the work 1 is cut to a predetermined length. Thereafter, the cam driver 12 of the press mold a is lowered, its cam surface 13 comes into sliding contact with the inclined surface 11 of the cam slide 9, and the cam slide 9 is pushed horizontally toward the fixed mold 4. Due to this movement of the cam slide 9, the edge portion 2 of the workpiece 1 is pressed by the die 10, and is also pressed against the bent surface 7 of the fixed die 4 to form an L-shaped cross section as shown in FIGS. 5 and 6. It is bent and formed.

Incidentally, in recent years, in order to improve the rigidity of automobile bodies, there has been a demand for deep groove bending of the edge portion 2 of the workpiece 1 as shown in FIG.
The conventional press die a cannot perform deep groove bending on the edge portion 2 of the workpiece 1.

FIG. 8 shows a press die b which is an application of the conventional press die a and is capable of deep groove bending.
In FIG. 8, reference numeral 14 denotes a fixed mold into which an upper mold (not shown) is removably fitted.
6 is formed. The width l of the concave groove 16 of the fixed mold 14 is the width of the edge 2 of the workpiece 1 after the groove bending process.
The width dimension is approximately the same as the width dimension l' of the concave groove 1.
It is formed to protrude outward by a predetermined length from the top wall surface 18 of the bottom wall surface 17 of No. 6.

19 are the top wall surface 18 and the bottom wall surface 1 of the fixed mold 14;
The cam slide 19 is disposed so as to be linearly reciprocatable in the direction along the direction 7, and a protruding die 20 is formed at the tip of the cam slide 19 to be removably inserted into the groove 16 of the fixed mold 14. , sloped surface 2 at the rear
1 is formed. 22 and a cam driver arranged above the cam slide 19 so as to be able to move up and down.
A cam surface 23 is formed at the lower end to make sliding contact with the inclined surface 21 of the cam slide 19.

When performing deep groove bending on the edge portion 2 of the workpiece 1, the workpiece 1 is first drawn with the fixed die 14 and the upper die (not shown), and then the edge portion 2 of the workpiece 1 is bent into a predetermined shape. The opening surface 16a of the concave groove 16 of the fixed mold 14 is cut into length dimensions as shown by the dashed line.
to hold. After that, the cam driver 22
By operating the cam slide 19, the cam slide 19 is pushed and moved horizontally toward the fixed mold 14, and the die 20 is fitted into the groove 16 of the fixed mold 14, and the fitting operation of the die 20 causes the end edge of the workpiece 1 to be moved. 2 is pressed against the inner surface of the groove 16 and bent into a groove shape.

Problems to be Solved by the Invention According to the conventional press mold b that is capable of grooving, the clearance between the cam slide 19 and the bottom wall surface 17 of the concave groove 16 of the fixed mold 14 is not sufficiently secured. Cam slide 19 in groove 16 of mold 14
When the die 20 is inserted and pushes the edge 2 of the work 1 into the groove 16, there is a problem that the edge 2 gets caught on the outer corner 17a of the bottom wall surface 17 of the groove 16 and is torn off. It was hot. Moreover, the edge portion 2 of the workpiece 1 cannot be reliably bent, resulting in a problem of spring back.

Means for Solving the Problems The present invention has been proposed in view of the above problems, in which a smooth surface is formed on the outer edge of the workpiece that is substantially orthogonal to the edge of the workpiece that is fitted onto the workpiece mounting surface. Fixed type and
a first cam slide installed to be capable of linear reciprocating movement in a direction along the smooth surface of the fixed mold, and having a first die protruding from its tip so as to be able to pass over the smooth surface of the fixed mold; A second cam slide, which is installed so as to be capable of linear reciprocating movement in a direction substantially orthogonal to the smooth surface, and whose tip is configured to groove the edge of the workpiece in cooperation with the first die of the first cam slide. and a second cam slide in which a die is formed.

Function When the edge of the workpiece is held in a state substantially perpendicular to the smooth surface of the fixed mold, the first cam slide moves forward in the direction along the smooth surface of the fixed mold, and this first cam slide moves forward. In conjunction with the operation, the second cam slide moves toward the smooth surface. When the first cam slide moves forward, the edge of the workpiece is pushed into a concave shape along the smooth surface of the fixed mold by its first die, and at the same time, the second die of the second cam slide
The free end of the edge of the workpiece is pressed by the die and gradually bent into a J-shape, and by the cooperation of the first die and the second die of both cam slides, the edge of the workpiece is is deep grooved.

Embodiments Hereinafter, embodiments of the press die C according to the present invention will be described with reference to FIGS. 1 and 2. In the drawing, 31 is the upper mold (not shown)
This fixed mold 31 is installed below so as to be able to fit into the upper mold, and this fixed mold 31 has a punch 32 protruding laterally at its upper end, and an arcuate workpiece fitting surface 33 on its upper end surface. and a smooth surface 35 perpendicular to the outer wall surface 34 perpendicular to the lower surface of the punch 32.
has been formed. Reference numeral 36 denotes a mounting board fixed to a lower mold holder (not shown) at a position outside the fixed mold 31;
The first cam slide is mounted so as to be movable linearly in a direction along the smooth surface 35 of the first cam slide. 1st above
The cam slide 37 has a protruding first die 38 formed protrudingly on the upper part of the tip so that it can rub against the smooth surface 35 of the fixed die 31, and is pressed against the tip surface facing the outer wall surface 34 of the fixed die 31. A cam surface 39 is formed thereon. 40 is a mounting board fixed to the outer wall surface 34 of the fixed mold 31, and 41 is a first cam slide which is movable linearly and reciprocally in a direction orthogonal to the smooth surface 35 of the fixed mold 31 on the mounting board 40; 37, and this second cam slide 41 is always held downward by a tension spring or the like, that is, the second cam slide 41 is attached to the smooth surface 3.
It is biased in the direction away from 5. The outer part of the tip 42 of the second cam slide 41 that abuts the smooth surface 35 of the fixed mold 31 is cut out to have a rectangular cross section, and the tip 42 has a concave groove 4 formed by the smooth surface 35.
3, and the horizontal surface 44b of the second die 44 protrudes outward by a predetermined distance from the outer surface 32a of the punch 32 of the fixed mold 31. At the same time, an inclined surface 45 is formed on the rear end portion to be in sliding contact with the pressing cam surface 39 of the first cam slide 37, so that when the first cam slide 37 is at the forward end position, The first die 38 is configured to fit into a groove 43 formed by the fixed mold 31 and the second cam slide 41.

Next, the operation of the present invention will be explained as follows.

The work 1 is an upper die (not shown) and a fixed die 31.
When the end edge portion 2 of the workpiece 1 is press-formed with the fixed mold 31 and the end edge portion 2 is cut to a predetermined length dimension and fitted onto the workpiece fitting surface 33 of the fixed mold 31, the end edge portion 2 of the workpiece 1 is pressed into the fixed mold 31. The punch 32 is held substantially perpendicular to the smooth surface 35 of the punch 32. Then, the first cam slide 37 moves forward in a direction along the smooth surface 35 of the fixed mold 31, and the forward movement of the first cam slide 37 causes its pressing cam surface 39 to move against the inclined surface 45 of the second cam slide 41. The second cam slide 41 is moved linearly upward against the biasing force of a tension spring or the like by pressing the inclined surface 45 while slidingly contacting the second cam slide 41 as shown in FIG. When the first cam slide 37 moves further even after the tip surface 38a of the first die 38 of the first cam slide 37 comes into contact with the edge 2 of the workpiece 1, the first die 38 and the fixed mold 31 smooth surface 3
5 rub against each other and the edge 2 of the work 1 is pushed into a concave shape along the smooth surface 35. At that time, the free end 2 of the edge 2 of the workpiece 1, which is being pushed into a concave shape,
a is the first cam slide 3 by the cam mechanism.
As a result, the edge portion 2 of the workpiece 1 is gradually bent into a J-shape. Then, the second cam slide 4
As shown in FIG.
The first die 38 of the first cam slide 37 is in contact with the smooth surface 35 of the first cam slide 37 to form a groove 43 between the smooth surface 35 and the second cam slide 41 . are tightly fitted through the workpiece edge 2, and due to this fitting, the edge 2 of the workpiece 1 is
The first cam slide 37 is pressed along the smooth surface 35 of the fixed mold 31 by the first die 38 of the first cam slide 37, and the second die 44 of the second cam slide 41 is pressed along the die 38 to form a substantially J-shaped groove.
When the edge portion 2 of the workpiece 1 is grooved in this manner, the first cam slide 37 retreats. Then, the second cam slide 41 moves downward while its inclined surface 45 comes into sliding contact with the pressing cam surface 39 of the first cam slide 37 due to the urging force of a tension spring or the like. Repeat the same operation below.

In the above embodiment, a deep groove is formed in the lateral direction, but the present invention is not limited to the above embodiment, and the first cam slide is vertically movable, and the second The cam slide may be arranged horizontally movably to form a deep groove in the vertical direction. Further, in the above embodiment, the first and second
Although the cam slides are interlocked by the cam mechanism, they may be interlocked by other appropriate means.

Effects of the Invention According to the present invention, the first and second cam slides, which are arranged to be capable of linear reciprocating movement in mutually orthogonal directions, work together to groove the edge of the workpiece. The edges are reliably bent and formed, preventing the occurrence of spring back, and the edges of the workpiece do not get caught in the corners of the fixed die or cam slide during grooving. It is possible to reliably prevent the edge portion from being damaged or torn, and the yield of products can be greatly improved. Moreover, the structure is simple and the cost is low.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view showing an embodiment of a press die according to the present invention, and FIG. 2 is a partial vertical cross-sectional view showing its operating state. Figure 3 is a schematic front view of the conventional outer panel of an automobile front door, and Figure 4 is A of Figure 3.
-A sectional view, Figure 5 is a longitudinal sectional view of a conventional press mold, Figure 6 is a longitudinal sectional view showing the conventional pressing procedure for the edge of a workpiece, and Figure 7 is a grooved workpiece. FIG. 8 is a vertical cross-sectional view of a press die that can perform groove bending by applying a conventional press die. DESCRIPTION OF SYMBOLS 1...Work, 2...Edge, 31...Fixed type, 33...Work placement surface, 35...Smooth surface, 3
7...first cam slide, 38...first die, 41...second cam slide, 44...second
die.

Claims (1)

[Claims] 1. A fixed mold having a smooth surface formed on the outer edge thereof to be substantially perpendicular to the edge of the workpiece fitted on the workpiece mounting surface;
a first cam slide installed to be capable of linear reciprocating movement in a direction along the smooth surface of the fixed mold, and having a first die protruding from its tip so as to be able to pass over the smooth surface of the fixed mold; a second die that is installed so as to be capable of linear reciprocating movement in a direction substantially orthogonal to the smooth surface, and has a tip thereof that cooperates with the first die of the first cam slide to form a groove on the edge of the workpiece; A press mold consisting of a second cam slide formed with a.