JPH0323020A - Drawing device - Google Patents

Abstract

PURPOSE:To restrain a position of a work and to prevent the work from being shifted and wrinkled with a simple structure in a bending stage by mounding a gage block at a prescribed position on the surface of a die. CONSTITUTION:This device is provided with a punch 3, a die 2 having a forming recessed part and a blank holder 4, and the middle part of the surface of a die 2 including a die face 6 enclosing a forming recessed part and sticking closely to the lower end surface of the blank holder 4 is recessed in to form a recessed shape. The gage blocks 13 are set at the recessed place of the surface of this die 2 and at a position outside the die face 6. Further, the clearance between the inside surface of this gage block 13 and the outside surface of the blank holder 4 is made a little larger than the thickness of the work W. Furthermore, the upper surface of the gage block 13 is made nearly equal to the height of the die face 6 formed at the unrecessed site on the surface of the die 2 and the edge part of the work W is mounted on the upper surface of this gage block 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a drawing device that performs drawing processing after bending and forming a plate material such as a copper plate in the form of a flat plate. (Prior art) For example, When the shape of the drawn product is bent as a whole and has a predetermined drawing depth along the bend, such as an automobile trunk lid outer plate or trunk lid inner plate, the whole is bent and formed. There is a forming device that performs drawing under the shape to reduce the drawing depth (see Figures 7 to 9). In such a case, the shape of the surface J of the die F is formed into the required concave curved shape. A blank flat plate material for a molded part (hereinafter referred to as work W) is put into a drawing device A, and pressed by a blank holder D, thereby forming a concave surface in the center of the surface J of the die F. The entire shape of the workpiece W is bent to the position of the part between the workpiece W and M (hereinafter referred to as the recessed part K), and the edge of the workpiece W is held on the surface J of the die. ,after that,
The drawing punch E is activated to draw the four forming parts. In this way, when the entire shape of the workpiece W is bent by the blank holder D, it is necessary to fix the workpiece WP at a predetermined position on the surface J of the die F. The workpiece W is fixed using the In other words, the draw forming vl position A consists of an upper die B and a lower die C, and the upper! The MB is equipped with a blank holder D and a punch E, and the lower die C is equipped with a movable gauge G and positioning jigs P, Q, and R on the die F, and this movable gauge G is attached to a hydraulic cylinder H. It is placed horizontally so that it can be opened and closed. In this drawing device A, the flat leak W is connected to the die F by positioning jigs P, Q, and H.
The edge of the workpiece W is placed on the die face. Then, while adjusting the position of the workpiece W on the die by operating the movable gauge G, the edge of the workpiece W is supported between it and the surface J of the die, and then the blank holder D is lowered toward the workpiece. Then, a bending process of the workpiece is performed, and then a drawing process using the punch E and die F is performed. (Problem to be solved by the invention) By the way, in such conventional technology, the movable gauge G
The structure is complicated, and the die surface J
The workpiece W is positioned above, but in Fig. 7, the workpiece W is positioned vertically. In FIG. 8, the work W is supported only by the left and right edges, and it is necessary to operate the movable gauge G from both sides to fix the work W at a predetermined position on the surface J of the die. If the movable gauges G installed on both sides of the workpiece are not constructed so as to contact and support the workpiece W at the same time, the movable gauge G that came into contact first will move the workpiece W, causing variations in the machining position. Adjustment is troublesome. Also, at the left and right positions in Fig. 7, it becomes a recessed part K, and the work W
Blank holder D is floating and not fixed.
Misalignment tends to occur during bending. This invention was made based on this background and aims to solve this type of problem. In order to achieve this object, the present invention includes a punch, a die having a forming recess, and a blank holder, which surrounds the certain shaped recess and is located under the blank holder. The central part of the surface of the die, including the die face with which the end face is in close contact, is recessed to form a concave shape, and the recessed part of the surface of the die, which is located on the outside of the die face, has a concave shape. A gauge block is installed, and the gap between the inner surface of this gauge block and the outer surface of the blank holder is made slightly larger than the thickness of the workpiece, and the upper surface of this gauge block is fitted into the recess on the surface of the die. The height of the die face is approximately the same as the height of the die face formed in the area where the gauge block is not formed, and the edge of the workpiece is placed on the top surface of this gauge block. (Function) According to the present invention, a gauge block is installed on the outside of the die face in the recessed part of the surface of the die, and the upper surface of this gauge block is formed in the recessed part of the die surface. approximately match the height of the die face.
The edge of the workpiece is also placed on the upper surface of this gauge block.
il, the workpiece can be supported horizontally on the die face before bending. Further, the gap between the inner surface of the gauge block and the outer surface of the blank holder is made slightly larger than the thickness of the workpiece,
The upper surface of this gauge block was made to approximately match the height of the die face formed in the portion of the surface of the die that is not recessed, and the edge of the workpiece was placed on the upper surface of this gauge block, so that the blank When the blank holder first comes into contact with the workpiece due to the pressing action of the holder, the edge of the workpiece is immediately bent into the gap between the inner surface of the gauge block and the outer surface of the blank holder at that position and is pinched. , form a guide part on the workpiece. This prevents the workpiece from shifting or wrinkling during the bending process using the blank holder. Therefore, according to the present invention, by simply placing a gauge block at a predetermined position on the surface of the die,
A simple structure can restrain the position of the workpiece during the bending process. Further, according to the present invention, since there are no operating parts, there is no need for simultaneous operation as in the prior art, and there is no need to perform wAN for simultaneous operation. (Example) The present invention will be explained below with reference to an example shown in the drawings. The drawing device S is composed of an upper mold 1 and a lower mold 2. The upper mold 1 is provided with a drawing punch 3 and a blank holder 4 surrounding the outer periphery of the punch 3, and the lower mold 2 A drawing forming recess 5 is formed in the center of the surface of the lower die 2, and the lower end surface of the blank holder 4 is formed at the peripheral edge of the drawing forming recess 5 over the entire circumference of the forming recess 5. A die face 6 that is pressed in close contact is formed. As shown in FIGS. 4 and 6, the overall shape of the surface of the lower mold 2 is a concave shape with a recess in the center and a substantially "<" shape when viewed from the side, and at the same time, the die face 6 The die face 6 has a similar concave shape, and a recessed portion 8 is formed in the lower part of the die face 6. On the other hand, the punch 3 and the blank holder 4 provided on the upper die 1 are operated independently, and the punch 3 is lowered after the lowering process of the blank holder 4, and after the upward movement of the punch 3 after the drawing process, the punch 3 is lowered. The blank holder 4 is configured to rise. This blank holder 4 surrounds the punch 3, and has a protrusion 7 formed on its lower end surface that is approximately triangular and identical in shape to the shape of the die face 6 and protrudes toward the lower mold 2 side. (See Figure 6). Therefore, when a flat workpiece W is set on the die face 6 on the surface of the lower mold 2, the edge of the workpiece W is basically supported by the die face 6 (hereinafter, such a die face (referred to as a work supporting die face 6a), the work W is spaced upward from the upper surface of the die face 6 in the recessed portion 8.

When the blank holder 4 is brought into contact with this, the work W
The protrusions 7 first come into contact with the workpiece W, and these protrusions 7 push down the work W to the position of the recess 8 and pinch it to perform bending. That is, the flat workpiece W is bent between the blank holder 4 and the die face 6, and in this embodiment, the entire workpiece W is shaped like a "<" in order to make the drawing depth of the product almost uniform. It is bent into a shape. Then, the blank holder 4 stops at the bottom dead center, and the bent work W is fixed on the die face 6 over the entire circumference of the forming recess 5 in its bent shape, and is drawn by the punch 3. It functions as a blank holder. Projections 11 and grooves 12 surrounding the punch 3 and forming recess 5 are formed on the lower surface of the blank holder 4 and the die face 6, respectively, to face each other, and the workpiece W is bent between them. This prevents the workpiece W from shifting and wrinkling during drawing by the punch 3.

As shown in FIG. 2, a gauge block 13 according to the present invention is placed on the surface of the lower die 2, which is a concave portion and is the outer side of the die face 6 with which the blank holder 4 abuts. Various positioning devices for the workpiece W on the die face 6 are arranged. The gauge block 13 has its inner surface attached to the blank holder 4.
The gauge block 13 is located at a distance slightly larger than the plate thickness of the workpiece W from the outer surface opposite to the inner surface of the gauge block 13,
Further, the height of the upper surface of this gauge block 13 is made to match the height of the workpiece support die face 6a, and is fixed to the surface of the lower mold 2 outside the recessed part 8 with bolts. Alongside these gauge blocks 13, positioning jigs 14 formed by standing up plate materials are installed, respectively.
It is designed to restrict the horizontal position of the flat workpiece W set on the upper surface of the lower mold 2 in the left and right direction in FIG. On the surface of the lower WM 2, positioning jigs 15 and 16 are installed on the outside of the die face 6 in a direction orthogonal to the area where the gauge block 13 etc. are installed, and the die face 6 of the flat work W is installed. The vertical positioning in Figure 2 above is performed. In the drawing forming apparatus fls constructed in this way, first, a third
As shown in the drawings and FIG. 4, a workpiece W made of a flat copper plate punched in advance into a predetermined shape is fed to a predetermined position by a feeding device such as a robot (not shown). At this time, the workpiece W is supported by the workpiece supporting die face 6a and the upper surface of the gauge block 13, so even if the recessed portion 8 is formed in the die face 6, the workpiece W is
There are many supporting points, and by supporting the workpiece W with little deflection, it is possible to improve the precision of the machining position. Next, as shown in FIG. 6, when the blank holder 4 descends from above, the protrusion 7 formed on the blank holder 4 first contacts and presses the workpiece W. As a result, the edge of the workpiece W placed on the upper surface of the gauge block 13 is locally bent along the outer circumferential surface of the blank holder 4 between the upper surface of the gauge block 13 and the lower surface of the protrusion 7. Gauge block 13 is placed in the result work W.
A half-square cylindrical guide portion 10 is formed to follow the shape of the workpiece W, and the workpiece W is engaged with the gauge block 13 until the workpiece W reaches the bottom 9 of the recessed portion 8, thereby preventing the deviation of the center position of the workpiece W with respect to the die face 6. This can be prevented (Figure 5). Then, the blank holder 4 continues to descend in this state until the entire lower surface of the blank holder 4 reaches the die face 6, thereby completing the bending of the entire workpiece W. Thereafter, the punch 3 of the upper mold 1 starts to descend, and the lower surface of the punch 3 is pushed into the molding recess 5 from the upper surface of the bent workpiece W, thereby performing a drawing process, and the punch 3 is moved as shown in FIG. The drawing process is completed when the bottom dead center is reached as shown in . Thereafter, the punch 3 and blank holder 4 are raised and the workpiece W is removed, thereby obtaining a drawn product whose overall shape is bent in the uniaxial direction. (Effects of the Invention) Since the present invention is constructed as described above, a gauge block is installed on the outside of the die face in a recessed area on the surface of the die, and the upper surface of this gauge block is connected to the surface of the die. The edge of the workpiece was placed on the upper surface of this gauge block so that the height of the die face was approximately the same as the height of the die face formed in the part of the gauge block that was not recessed. can be supported horizontally. Further, the gap between the inner surface of the gauge block and the outer surface of the blank holder is made slightly larger than the thickness of the workpiece,
The upper surface of this gauge block was made to approximately match the height of the die face formed in the portion of the surface of the die that is not recessed, and the edge of the workpiece was placed on the upper surface of this gauge block, so that the blank holder When the blank holder first contacts the workpiece by the pressing operation, the edge of the workpiece at that position is immediately bent and sandwiched into the gap between the inner surface of the gauge block and the outer surface of the blank holder, Form a guide part on the workpiece. This prevents the workpiece from shifting or wrinkling during the bending process using the blank holder. Therefore, according to the present invention, by simply placing a gauge block at a predetermined position on the surface of the die,
A simple structure can restrain the position of the workpiece during the bending process. Further, according to the present invention, since there are no moving parts, there is no need for simultaneous operation as in the prior art, and there is no need to make special adjustments for simultaneous operation.

[Brief explanation of drawings]

1 to 6 relate to an embodiment of the present invention, in which FIG. 1 is an overall sectional view of the device taken along line I-I in FIG. 2, FIG. 2 is a top view of the lower mold, and FIG. A cross-sectional view of the lower die corresponding to FIG. 1 when the punch and blank holder are at the top dead center, FIG. 4 is a view in the direction of the ■ arrow in FIG. 3, and FIG. 6 is a perspective view for explaining the relationship between the die face, gauge block, and blank holder; FIGS. 7 to 9 show conventional examples; FIG. 7 is a top view of the lower die; FIG. 8 is an overall cross-sectional view of the device taken along the line ■--■ in FIG. 7, and FIG. 9 is a cross-sectional view taken along the line IX--■ in FIG. Drawing device, die (lower mold), blank holder, die face, recess, gauge block. Workpiece, punch, protrusion, lO; guide part, Fig. 1 WS: Calibration l) Driving fold 5 10: Force id 4l5 13: Cage block 8: Recessed sound p Fig. 4 W Fig. 7 ]■ ''■ Figure 6 Y 7: Research Department Figure 8 Figure 9

Claims (1)

[Scope of Claims] A punch, a die having a molding recess, and a blank holder, wherein a central part of the surface of the die including a die face that surrounds the molding recess and is in close contact with a lower end surface of the blank holder is recessed. At the same time, a gauge block is installed at the concave portion of the die surface at a position outside the die face, and the inner surface of the gauge block and the blank holder are connected to each other. The gap between the gauge block and the outer surface is made slightly larger than the plate thickness of the workpiece, and the upper surface of this gauge block is made to approximately match the height of the die face formed in the portion of the die surface that is not recessed. A drawing forming device characterized in that the edge of the workpiece is placed on the upper surface of the gauge block.