JPH02192830A - Press die with drawing, blanking and bending mechanisms - Google Patents

Abstract

PURPOSE:To carry out drawing, blanking and bending at one stroke by giving die function, punch/bend function and positioning function suitably in duplication to use these dies in common to a drawing punch, a drawing die and a blank holder device. CONSTITUTION:A drawing punch 4 is lowered and the periphery of a stock W is held between an upper blank holder 5 and a lower blank holder 10 and the stock W begins its drawing. The blank W is stretched, elongated and attached to a drawing punch 4 to generate work hardening and adjust surface quality. Further, a cutter 14 for a blanking/bending member 12 in a drawing die 10 of a lower die 3 is brought by the fall of the punch 4 into contact with the blank W and the blank W is blanked by the cutting edge 7' of the drawing punch 4 and the cutting edge 14 of the lower die member 12. While the blanked stock in the central part is held between the drawing punch 4 and a pressure member 11, it is bent by the bending edge 15 of the blanking/bending member 12 and the bending edge of the drawing punch 4 with the fall of the drawing punch 4. Hereafter, the punch 4 rises and is taken out of the lower die 3.

Description

[Detailed Description of the Invention] [Industrial Application Field] In the press forming field, for example, in the process of manufacturing automobile door outerwear, flange bending of a panel with a small flange bending R is sometimes required. The present invention relates to a press die for forming a press product having a flange bent portion with a small radius in one step.

[Conventional technology]

Conventionally, press products having a flange bending portion with a small radius have been manufactured in three steps because if only drawing was used, cracking would occur at the bending radius portion due to the limit of formability of the material. This prior art will be explained with reference to FIGS. 17 to 24.

When molding a substantially box-shaped product 20 whose entire circumference is flanged with a small radius as shown in FIGS. 17 and 18, the first step is drawing forming as shown in FIG. A drawn product 22 is obtained. A BB cross-sectional view of the drawn product 22 is shown in FIG. The bending radius of the bottom end portion 23 of the drawn product 22 is relatively large, and the material held by the wrinkle presser of the drawing die is drawn by a drawing punch having a relatively large bending radius. During this drawing process, the material is attached to the drawing punch and stretched, making the surface of the material smoother, improving the surface quality of the material, and creating plastic deformations such as patterns, such as the outer panel of a car door. It can now be used as a material that requires high surface quality.

Next, as a second step, as shown in FIG.
The external shape of is determined. At the same time, as shown in FIG. 22, the portion outside the trimming line 26 becomes scrap 25.

Finally, in the third step, as shown in FIG. 23, the product portion 24 is bent and formed into the final product shape 27 along the bending profile 28. What is shown by the two-dot chain line is the product portion 24 before bending, and what is shown by the solid line is the product shape 27. As shown in FIG. 24, the bending radius of the bending profile 28 which is the bottom end in the D-section of the product shape 27 is formed to be a small radius. As a result, a product 20 shown in FIG. 17 is obtained.

[Problem to be solved by the invention] However, in the above-mentioned forming method, the drawing die in the first step, the outline cutting die in the second step, and the bending die in the third step are all done using separate dies, so three press dies are used. The problem was that one was required. Three press dies are required, and the problems associated with this are the transportation means for transporting the drawn product formed by the drawing die to the outline cutting die in the next process, and the product punched by the outline cutting die. Each requires a transport means for transporting the part to the next bending die.

Furthermore, it is necessary to provide positioning means for respectively positioning the drawn product and the product portion conveyed by the conveying means in the outline cutting die and bending die of the next process.

Therefore, the present invention provides a drawing punch, a drawing die, and a wrinkle holding device that constitute a drawing die with duplication of the die function, punching/bending function, and positioning function as appropriate, so that the die can be shared, thereby creating a single press. The purpose is to mold a product with a pin-cornered flange bend in one molding process.

[Means to solve the problem]

A press die with a drawing and bending mechanism according to the present invention that achieves the above-mentioned object is composed of a drawing punch, a drawing die having a recess into which the punch can be inserted, a wrinkle holder on the die side, and a wrinkle holder on the drawing punch side. In a press mold having a wrinkle suppressing device, a punching blade in the recess, a wavy member having a bending blade located at a position slightly farther from the punching punch than the punching blade, and a pressing member biased in the direction of the punching punch. The present invention is characterized in that the drawing punch is provided with a groove portion into which the wave bending member can be inserted.

[Effect]

Since the present invention has the above-described configuration, first, the material held by the wrinkle suppressing device is drawn by a drawing punch, and the material is drawn by the corrugated member provided on the drawing die near the forward end of the drawing punch. is performed, and then bending is performed while the material is held between the pressing member and the drawing punch.

〔effect〕

In this way, the drawing punch is provided with a groove to provide the die function, and the drawing die side is provided with a wavy member to provide the punching and bending function and a pressing member to prevent the material from curving during bending. In addition, the positioning of the material at the start of the punching process is performed using the holding device of the drawing die, so that drawing, punching, and punching can be performed with one stroke of the drawing punch in the drawing die.
Can be bent. As a result, the number of molds is reduced and mold manufacturing costs are reduced. Furthermore, the workpiece conveyance device that was conventionally located between the three press dies becomes unnecessary.

〔Example〕

(First Embodiment) A first embodiment of a press die with a drawing and bending mechanism will be described with reference to FIGS. 1 to 4. Here, FIG. 1 is a longitudinal sectional view showing the initial state of forming, FIG. 2 is a longitudinal sectional view showing the state where forming has progressed and the material W has been punched, and FIG. FIG. 4 is a longitudinal cross-sectional view showing a state in which the dead center has been reached and bending is completed, and FIG. 4 is a schematic diagram showing the drawing, punching, and bending profiles of the press die shown in FIG. 1.

The press die 1 with a drawing and bending mechanism according to the present embodiment first presses and holds the material W between the upper die wrinkle holder 5 on the drawing punch 4 side and the lower die wrinkle holder 1o on the drawing die 101 side, and then presses and holds the material W on the drawing punch 4 side. This is a double-action drawing press mold that performs press forming by descending. The target product is a door outer panel, which is one of the large exterior panels of an automobile.

The upper mold 2 is composed of a drawing punch 4 and an upper mold wrinkle holder 5. A groove 6 is provided on the bottom molding surface of the drawing punch 4, and a punching blade 7 is formed on the outside of the groove 6 with respect to the center E of the drawing die. The inside of the cage has a bending blade 8. FIG. 4 is a bottom view of the forming surface of the bottom of the drawing punch 4 seen from below. As shown in the figure, the punching profile 17 of the punching blade 7 is a closed curve, and the bending profile 16 of the bending blade 8 is also a closed curve. It has become. The bending profile 16 is located inside the punching profile 17.

On the other hand, the lower die 3 has a drawing die 10, a lower die wrinkle holder 10,
It is composed of a pressing member 11, a wave bending member 12, and a spring 13. The pressing member 11 is always urged upward by a spring 13 attached to its lower part. This pressing member 11 is provided to press the material W against the drawing punch 4 during punching and bending to prevent the material from curving.

Wave bending member 12. has a punching blade 14 on the outside and a bending blade 15 on the inside with respect to the drawing center l. The profile of the punching blade 14 and the profile of the bending blade 15 respectively correspond to the punching blade profile 17 and the bending blade profile 16 located on the bottom forming surface of the drawing punch 4 described above. In other words, the punching blade 7 provided on the drawing punch 4
The punching blade 14 of the corrugated member 12 is set to have an appropriate clearance to minimize the occurrence of sagging and fringing when cutting the material. Further, the bending blade 8 provided on the drawing punch 4 and the bending blade 15 of the corrugated member 12 are set to have an appropriate clearance (equal to the thickness of the dowel plate) in order to precisely form the surface of the material. The bending blade 8 of the drawing punch 4 bends the material W at a pin angle (0,
The bending edge R is set at approximately 90° so that it can be bent at an angle of 3R or less. Note that the punching blade 14 of the corrugated member 12 is set slightly higher than the bending blade 15 thereof. This is because it is necessary to punch out the material W faster than bending it.

Next, the operation will be explained.

First, a flat material is held between an upper mold wrinkle holder 5 and a lower mold wrinkle holder 10. Thereafter, as shown in FIG. 1, the drawing punch 4 descends and the material W is drawn. During the drawing process, the material W is sandwiched between the upper mold wrinkle holder 5 and the lower mold wrinkle holder 10, and its flow into the interior is restricted, so when the material W starts to be squeezed by descending the drawing punch 4, the material A tensile force acts on the material W, and the material W is stretched. In other words, the material W is stretched and stretched and adheres to the drawing punch 4, which causes work hardening of the material W and improves the surface quality of the material W, which is required for appearance, such as the outer panel of a car door. will be given to the material W.

The radius of the corner 9 of the drawing punch 4 is very gentle, and during the drawing process, the material located on the lower surface of the drawing punch 4 and the material located on the vertical wall of the drawing punch 4 are stretched evenly and uniformly. Work hardening is performed.

When the material W is further lowered in this state attached to the drawing punch 4, the punching blade 14 of the corrugated member 12 inside the drawing die 101 of the lower die 3 comes into contact with the material W. after that,
As shown in FIG. 2, the material W is punched out by the punching blade 7 of the drawing punch 4 and the punching blade 14 of the lower die member 12. The punched central rectangular material W1 is later further pressed into a product. The material W2 that remains after the rectangular material WI is removed, that is, the material Wt with a rectangular hole, is
It becomes scrap.

The punched central material W is held between the drawing punch 4 and the pressing member 11 as shown in FIG. Bending is performed with the blade 8. Since the material W is held between the pressing members 11 during bending, curving of the material can be prevented. Bending R of bending blade 8 of drawing punch 4
is a pin angle, and unlike drawing forming, it is bending forming, so no tensile force is applied to the material W+ and the material WI is smoothly bent, so the bent R portion of the material WI becomes a pin angle. The material W which has been bent and formed into a pin angle in this manner is shown in FIG. 3 together with the drawing punch 4 in the bottom dead center state.

Thereafter, the drawing punch 4 is raised, and the WI bent into the pin angle and the scrap W2 are taken out from the lower die 3 by a conveying means (not shown).

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7.

In the first embodiment, a solid pressing member 11 biased by a spring 13 was used inside the lower mold 3 to prevent the material from curving during bending, but instead of this, a solid pressing member 11 was used as shown in FIG. A liquid dome 18 may be provided as a pressing member.
In the drawing press die 11 of FIG. 5, in FIG.
The point replaced by , and the punching blade 14 of the wavy member 12
This is the same as the press die 1 with drawing and bending mechanism shown in FIG. 1, except that the height difference between the bending blade 15 and the bending blade 15 is set slightly smaller. The reason why the difference in height between the punching blade 14 and the bending blade 15 of the corrugated member 12 is made slightly smaller is that after the material is punched out with the punching blade 14 and before being bent with the bending blade 15, the groove 6 of the drawing punch 4 is This is to prevent liquid from flowing into the Incidentally, although not shown, a hole is provided in the drawing die 10f to allow the liquid to escape when the drawing punch 4 is lowered. Figs. 5 to 7 show the operation of the drawing press type equipped with the liquid dome 18 described above. Specifically, FIG. 5 shows a longitudinal section of the drawing press die 1 when the material W is held between the upper die wrinkle holder 5 and the lower die wrinkle holder 10 and drawing forming is started by the drawing punch 4. 6 is a longitudinal sectional view of the drawing press mold 1' immediately after the drawing punch 4 has further descended and the material W has been punched out by the punching blade 7 of the drawing punch 4 and the punching blade 14 of the corrugated member 12. FIG. 7 is a longitudinal sectional view of the drawing press mold 1' when the drawing punch 4 reaches the bottom dead center and bending is completed by the bending blade 8 of the drawing punch 4 and the bending blade 15 of the corrugated member 12. shows. Note that the detailed explanation of the operation is the same as the explanation of the operation in FIGS. 1 to 3, and will therefore be omitted here.

(Third Embodiment) Furthermore, in the above-described embodiment, one molded product is molded using one press mold, but a plurality of molded products may be molded using one press mold. For example, in order to obtain two molded products by one press molding, the lower mold member 12 is
Two sets may be installed in one press mold 1. In such a press die, as shown in FIG. 9, there are two punching profiles 17, and a bending profile 16 is located within each punching profile 17.

Here, the dotted line 16' means the aperture profile.

In other words, in FIG. 8, the end portions W2 and the central portion W3 of the material W are scrapped, and the material W1 located inside the corrugated member 12 becomes a product.

In this way, two products with pin angles can be obtained from one pressed steel plate at the same time, which is double the number of products with the same number of presses compared to the first and second embodiments in which only one product can be obtained. products can be obtained.

(Example in Fig. 4) Furthermore, in order to eliminate the material W in the central part which is the scrap generated at this time, as shown in Fig. 1O, a punching blade 14 is provided in the central part of the lower die 3 and a bending blade 15 is provided on both sides of the cutting blade 14. A wave bending member 12' may also be provided.

In this case, as shown in FIG. 11, the outer circumferential closed curve and the center line become the punching profile 17, and the bending profile 16 forms a closed curve inside the punching profile 17, and there are two bending profiles 16.

In this way, it is possible to eliminate the scrap in the center part that occurs in the third embodiment, so that the yield can be increased.

With the bending profile and punching profile shapes shown in Figures 9 and 11, two molded products are obtained.
It is possible to obtain a plurality of molded products by combining various shapes of the bending profile 16 and punching profile 17. For example, in the other embodiment shown in FIG. 12, three molded products are obtained, and in the other embodiment shown in FIG. 13, four molded products are obtained.

In all of the examples cited so far, rectangular molded products are obtained, but it is also possible to obtain molded products with shapes other than rectangular by combining various shapes of bending profiles and punching profiles. For example, in another embodiment shown in FIG. 14, two triangular molded products can be obtained at the same time.

In addition, in all the examples mentioned so far, only polygonal shaped molded products can be obtained, but by making the bending profile and punching profile into curved shapes, it is also possible to obtain molded products with a wide variety of shapes. For example, in another embodiment shown in FIG. 15, a circular molded product is obtained.

Furthermore, although all of the embodiments mentioned so far have been of the double-action type, a single-action press type 1+t may be used as shown in FIG. In this case, the upper mold is provided with a member serving as a punching and bending blade, and the punch of the lower mold is provided with a groove.

[Brief explanation of the drawing]

1 to 3 show a first embodiment according to the present invention, and FIG. Schematic diagrams showing drawing, punching, and bending profiles of the first embodiment, and FIGS. 5 to 7 show the second embodiment of the present invention, and the drawing during drawing, punching, and bending, respectively. Vertical sectional views showing press molds with bending mechanism, Figures 8 and 10
The figures are longitudinal cross-sectional views showing the third and fourth embodiments of the present invention, and FIGS. 9 and 11 are drawing, punching, and bending profiles of the third and fourth embodiments of the present invention, respectively. FIGS. 12 to 15 are schematic diagrams showing drawing, punching, and bending profiles of other embodiments of the present invention, and FIG. 16 is a single action press mold according to the present invention. 17 is a perspective view showing the product shape, FIG. 18 is a sectional view taken along line A-A in FIG. 17, and FIG. 19 is a longitudinal sectional view.
Figure 21.23 is a perspective view of a press-formed product showing the conventional molding procedure, and Figures 20, 22, and 24 are respectively 19.21.
．． FIG. 23 is a sectional view taken along lines B, -B, CC, and D in FIG. 23; 1--1--・-Drawing press mold with wave bending function 4----
--- Squeezing punch 5, 1 (L-----1. Wrinkle pressing device 6-
--------One groove part 12------One punching bending member 14---------・Punching blade 15...-1111・Bending blade 101---・・・・・・・Diapering Dice 10”---------・-Concave part

Claims (1)

[Claims] (1) In a press mold having a drawing punch, a drawing die having a recess into which the punch can be inserted, and a wrinkle pressing device consisting of a wrinkle holding device on the die side and a wrinkle holding device on the drawing punch side, the punching die is inserted into the recessed portion. A bending member having a blade and a bending blade located at a position slightly farther from the drawing punch than the drawing blade, and a pressing member biased in the direction of the drawing punch are provided, and the bending member is inserted into the drawing punch. A press mold with a drawing and bending mechanism, which is characterized by the formation of grooves that allow for easy drawing and bending.