JPS639890B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention is used in a press machine that presses steel plates into various shapes, and in particular bends the peripheral flange of a steel plate in the vertical direction.
This invention relates to a press mold that can simultaneously perform a bending process in which a part of the flange end is further bent laterally.

B. Prior Art Each component that makes up the body of an automobile is molded into a desired shape through various press-working processes. For example, the hood of a car body is made by drawing to form a predetermined shape on a steel plate, punching to punch out the outer shape, bending to vertically bend the entire circumference flange of the punched steel plate, and then a part of the flange to be laterally bent. It is formed through processes such as bending and bending,
Conventionally, each of the above steps has been performed independently due to the molds used for each process, resulting in a large number of man-hours and low productivity. Therefore, in order to improve productivity, it is better to perform bending and corner bending at the same time.
There were problems in that it was difficult to remove the molded product and a complicated mold had to be used. That is, as a mold for performing the two steps at the same time, for example, the first
As shown in FIGS. 3 to 3, adjustment punches 3 and 4 are slidably arranged from the left and right between the fixed punch 1 and the movable punch 2, which are divided into front and rear parts. , 4 are tapered so that the movable punch 2 moves back and forth as the adjustment punches 3 and 4 move. Then, a cam 5 for performing bias bending is attached to the movable punch 2 so as to be slidable in the front and rear directions, and on the other hand, the cam 5 is lowered to the upper die together with the die and enters the guide grooves 3a and 4a of the adjustment punches 3 and 4, and moves them sideways. There are provided cam drivers 6, 7 for expanding and a cam driver 8 that enters the guide groove 2a of the movable punch 2 and slides the cam 5 in the rearward direction.

During machining, as the upper mold descends, the cam drivers 6 and 7 first move the guide grooves 3 of the adjusting punches 3 and 4.
a, 4a to spread them laterally, move the movable punch 2 to align them with the outer shape of the steel plate 9, and then a die (not shown) descends to punch the periphery of the steel plate 9. After bending, the cam driver 8 enters the guide groove 2a of the movable punch 2, and the cam 5 moves rearward to bend the end of the steel plate 9. When the machining is completed, the upper die rises, the cam drivers 6, 7, and 8 move out together with the die, the adjusting punches 3 and 4 narrow inward, and then the movable punch 2 moves backward, that is, towards the fixed punch 1. The movable punch 2 and the bent portion 9a of the molded product 9' are separated from each other, allowing the molded product 9' to come out upwards, and then a lifter (not shown) is raised to remove the molded product. Take out item 9'.

As mentioned above, in the conventional mold, the movable punch 2 and the adjustment punch 3 are
In order to prevent interference between the movable punch 2 and the bent portion 9a of the molded product 9', the movable punch 2 must be configured so that it can be moved inward when removing the molded product 9. The disadvantage was that the structure of the mold was complicated and the cost of manufacturing the mold was high, and there were also many sliding parts, resulting in poor durability.

C. Purpose of the Invention The present invention aims to provide a mold with a simple structure that can simultaneously perform bending of the entire circumference flange of a steel plate and partial bending of the steel plate, and that allows easy removal of the molded product. .

D. Structure of the Invention This invention integrally forms a bending part for bending the entire circumference flange of a steel plate and a deflection part for bending the whole circumferential flange of the steel plate on the upper surface of a punch provided in a lower mold, and the deflection part of the punch and A flange lifter that pushes up the flange of the molded product is provided on the opposing side surface, and a finger that engages with the bent end of the molded product is provided on the cam for offset bending, thereby reducing the spring back of the bent portion of the molded product or the elasticity of the steel plate. Using the deformation, one end of the bent flange of the molded product is lifted by a flange lifter, then the molded product is pulled out by a finger, and then the molded product is removed.

E. Example As shown in Fig. 4, the mold is composed of a lower mold A and an upper mold B. First, the lower mold A will be explained. 15 is the base of the lower mold A, and 16 is the molding provided on the base 15. Using a punch, the upper part 16a is formed to be wider than the lower part 16b and to follow the outer shape of the molded product, and a bending part 17 is formed to vertically bend the peripheral flange of the steel plate 9 on the other three sides excluding the tip of the upper part 16a. A bent portion 18 for bending the tip flange of the steel plate 9 in the vertical and horizontal directions is formed at the tip. Further, a cavity 19 is formed in the center of the punch 16 with the upper surface side open. Reference numeral 20 denotes a lifter provided in the cavity 19, and a support plate 2 provided with support members 21, 21, . . . for supporting the steel plate 9 at appropriate locations on the upper surface.
2 is supported by a piston rod of a cylinder 23, and as the cylinder 23 is extended, the supporting members 21, 21, .

Reference numeral 24 denotes a flange lifter provided on the opposite side surface of the punch 16 facing the bent portion 18. For example, the movable cylinder 26 is slidably fitted into the fixed cylinder 25, and the spring 27 is compressed in both cylinders 25 and 26. A push-up piece 28 is attached to the upper surface of the movable cylinder 25. Further, an L-shaped protrusion 29 is attached to the upper surface of the push-up piece 28. This flange lifter 24 has a fixed cylinder 25 fixed to the base 15 and a push-up piece 28 along the bending part 17 of the punch 16, and the movable cylinder 26 is expanded by the stored elasticity of a spring 27 and is constantly pushed up. The piece 28 is raised and lowered when forming the steel plate 9 so as not to interfere with the steel plate 9. In addition, the flange lifter 24
is the upper surface of the push-up piece 28 and the punch 16 at maximum extension.
Set it so that it is flush with the top surface of.

Reference numeral 30 denotes a slide stand disposed on the base 15 to face the offset bent portion 18 of the punch 16, and is formed in a substantially L shape, with the slide surface 31 tapered forward and downward, and the lower surface of the offset bent portion 18 of the punch 16. It is parallel to Reference numeral 32 denotes a cam disposed on the sliding surface 31 of the slide table 30, which is integrally attached with a bending blade 33 for bending the steel plate 9 at the upper part of the rear end, and extends forward at the bottom of the bending blade 33. A finger 34 is attached integrally. The offset bending blade 33 is arranged so that a gap is created between the upper surface and the lower surface of the offset bending portion 18 of the punch 16 into which the steel plate 9 can fit. Further, the finger 34 has a tip 34a.
is sufficiently separated from the tip surface of the offset bending blade 33 to a position where it does not interfere with the offset bending portion 9a of the steel plate 9, and facing the lower surface of the offset bending portion 18 of the punch 16 with a slight gap between the ends of the steel plate 9. It is arranged to engage the bent end. When the cam 32 retreats, it retreats to a position where the tip 34a of the finger 34 is substantially flush with the tip of the edge bending part 18 of the punch 16, and when it moves forward, it moves forward to a position where the edge bending blade 33 completes the edge bending. . The slide table 30, cam 32, and bending blade 33 are formed to have the same width as the punch 16 and the bending part 18, so that the entire tip flange of the steel plate 9 is bent. Also cam 3
2 is supported so as not to be movable in the width direction with respect to the slide base 30, and a moving force in the backward direction is constantly applied by appropriate means. Furthermore, fingers 34 are provided at a suitable number of locations in the width direction so that the molded product 9' can be pulled out in parallel.

Next, to explain the upper mold B, 35 is the upper mold B
The base 36 is a die fixed to the base 35, and is formed into a box shape large enough to surround the other three sides of the punch 16 except for the tip. A bending blade 37 for vertically bending the entire periphery flange of the steel plate 9 is integrally attached between them. A presser piece 38 is provided on the lower surface of the bending blade 37 facing the flange lifter 24.
As the die 36 descends, the presser piece 38 and the projecting piece 29 push down the push-up piece 28 against the spring 27 to prevent interference with the steel plate 9.

A pad 39 is attached within the die 36 via a suitable elastic body 40, and elastically presses the periphery of the steel plate 9 against the upper surface of the punch 16 during forming to prevent wrinkles from forming.

A cam driver 41 is integrally attached to the side of the die 36 in correspondence with the cam 32 of the lower die.The cam driver 41 moves up and down guided by the vertical surface 30a of the slide base 30 whose lower part is provided in the lower die, and when descending, the cam driver 32 is moved backward to perform the bending. The contact surfaces 41a and 32a between the cam driver 41 and the cam 32 are both tapered surfaces in order to convert the vertical movement of the cam driver 41 into the back and forth movement of the cam 32, and the contact surfaces 41a and 32a are tapered surfaces.
Bearing 4 to reduce frictional resistance between a and 32a
2 is interposed.

To explain the forming operation of the steel plate 9 by the lower die A and the upper die B having the above configuration, when the upper die B is raised, the die 36, the pad 39, the cam driver 4
1 is raised, the flange lifter 24 provided on the lower mold A side is on standby to rise, the cam 32 is advanced, and the bending blade 33 is on standby ahead of the punch 16.
In this state, the steel plate 9 that has been subjected to drawing and outline cutting is inserted between the upper die B and the lower die A, and placed on the punch 16.

When the steel plate 9 is placed on the punch 16, the upper die B
is lowered, and first the pad 39 is lowered and elastically presses the steel plate 9 against the punch 16 to bring them into close contact and position it. At this time, a part of the peripheral flange of the steel plate 9 pushes down the flange lifter 24 slightly. Subsequently, the die 36 and the cam driver 41 descend, and in conjunction with this, the holding piece 38 provided on the bending blade 37 cooperates with the protruding piece 29 provided on the flange lifter 24 to push the pushing piece 28 against the spring 27. While pressing down and preventing interference with the steel plate 9, the bending blade 37 provided on the die 36 intersects with the bent portions 37 formed on the three upper sides of the punch 16 to bend the peripheral flange of the steel plate 9 except for the tip. Bend vertically. At the same time, the cam 32 moves back due to the lowering of the cam driver 41, and the bending blade 33 is slightly delayed in timing from the bending blade 37 provided on the die 36, and the bending blade 33 is moved to the side bending portion 18 of the punch 16.
The tip flange of the steel plate 9 is bent to intersect with the flange.

When the steel plate 9 is bent and bent in this way, the upper die B rises, and the die 36 and the cam driver 41 rise first with the pad 39 pressing the steel plate 9 due to the action of the elastic body 40. Along with this, the push-up piece 28 rises due to the stored elasticity of the spring 27 of the flange lifter 24, and at the same time, the cam 32 moves forward and the finger 34 also starts moving forward. Then, the elastic body 40 supporting the pad 39 expands and the pad 39 begins to rise and releases the pressure on the steel plate 9, and the flange lifter 24
The push-up piece 28 is the bent flange end 9b of the steel plate 9.
The steel plate 9 comes into contact with the steel plate 9 and rises in this state, pushing up the steel plate 9 in a cantilevered manner (see Fig. 5). And push-up piece 28
reaches the rising end, and the bent flange end 9b of the steel plate 9
When it becomes flush with the upper surface of the punch 16, the tip 34a of the finger 34 comes into contact with the bent end 9c of the tip of the steel plate 9, and in this state, until the upper die reaches the rising end,
Further move forward and pull out the steel plate 9 forward from the punch 16 (see Fig. 6).

When the upper mold B completes its ascent and the pulling out of the steel plate 9 by the finger 34 is completed, the cylinder 23 of the lifter 20 provided in the punch 16 is extended, and the support plate 22 and the support members 21, 21... are raised. , the molded product 9' is supported by the supporting members 21, 21, . . . and taken out from the lifting punch 16. Thereafter, the molded product 9' is taken out from the lifter 20, and the work is completed (see FIG. 7). When the removal of the molded product 9' is completed,
The cylinder 23 is shortened, and the supporting members 21, 21
... is accommodated in the punch 16.

When the molded product 9' is taken out, the bent flange end 9b of the molded product 9' is pushed up by the push-up piece 28 of the flange lifter 24, and the bent flange end 9b of the molded product 9' is tilted with the offset bent portion 9a as a fulcrum. However, the inclination angle α is around 0.6°, and generally, when bending by press working, the spring back of the steel plate usually causes a spread of 2 to 3° at the bent part 9a. Since the inclination angle α is within the spring back range, the bent portion 9a will not be unduly widened. Further, even if spring back does not occur, the inclination angle α is as small as 0.6°, so it can be sufficiently tolerated by the elasticity of the steel plate 9. Therefore, the molded product 9' can be reliably removed by the above method without causing deformation.

Furthermore, when the upper mold B starts to rise, the cam driver 41 also starts to rise at the same time as the die 36, and the cam 32 starts moving forward, but when the bending is completed, there is no space between the bending end 9c and the finger 34. Since there is a sufficient gap, the bent flange end 9b of the molded product 9' is lifted by the flange lifter 24 by the time the finger 34 comes into contact with the bent end 9c.
There is no need for support when taking out.

F. Effects of the Invention In this invention, as the upper mold B rises, the bent flange end of the molded product is pushed up by the flange lifter provided on the side of the punch and lifted upward from the punch in a cantilevered manner, and then the bent cam The bent end can be pulled out from the bent part of the punch using the fingers provided in the punch, preventing interference between the molded part and the punch, and the molded part can be removed from the punch, allowing bending of steel plates that conventionally required two steps. It is possible to perform both bending and bending in one process, improving workability and productivity.

Furthermore, the punch having the bent portion and the offset bent portion can be constructed as a single piece, and the overall structure of the mold becomes simple, so that the mold can be provided at a low cost.

[Brief explanation of the drawing]

Fig. 1 is a drawing showing a conventional mold structure that can perform bending and offset bending at the same time, Fig. 2 is a sectional view taken along the lines of Fig. 1, and Fig. 3 is a sectional view taken along the lines taken from Fig. 1.
FIG. 4 is a longitudinal side view showing the structure of the mold according to the present invention, and FIGS. 5 to 7 are main part sectional views showing the operation of taking out the molded product. A...lower mold, B...upper mold, 9...steel plate, 9'...molded product,
16... Punch, 17... Bent part, 18... Side bent part,
24... Flange lifter, 28... Push-up piece, 32
...Cam, 33...Bending blade, 34...Finger, 3
6...die, 39...pad, 41...cam driver.

Claims (1)

[Claims] 1. A punch that has a vertically bent part on the upper periphery and has a deflected part in a part of the bent part, and a steel plate provided on the opposite side surface of the punch opposite to the deflected part so as to be movable up and down. When bending, it descends and retreats,
A flange lifter that pushes up the bent flange of the molded product when taking out the product, and a flange lifter that is movable back and forth in front of the bent portion of the punch and engages with the bent portion of the molded product that performs the partial bending of the steel plate. A lower mold A equipped with a cam etc. attached to a finger, a die that bends the entire circumference flange of the steel plate and moves the flange lifter up and down between it and a punch, and a cam driver etc. that moves the cam of the lower mold back and forth. A press mold comprising an upper mold B.