JPH09206844A - Pressing method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of press die of a pressing process to form a different kind of an object and to reduce the cost. SOLUTION: In a pressing method and the device therefor of pressing a different kind of work with plural numbers of processes, a forming die in a prescribed pressing process of plural numbers of forming dies used corresponding to each pressing process of each work is formed in common corresponding to the lap state when lapping each work and without interfering and pressing is executed. Accordingly, with this pressing method and the pressing device, the die producing expenditure is reduced by a prescribed process of making the forming die in common, because the low cost is made and the pressing station itself to execute the process can be made in common, the set space can be also saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-forming method and an apparatus for the same, which include a plurality of press-forming steps for press-forming different kinds of works.

[0002]

2. Description of the Related Art For example, a press for two kinds of works Wa and Wb having a three-dimensional shape such as a vehicle fender panel, a pillar inner panel, a quarter panel, etc., and having substantially symmetrical shapes but different machining shapes from each other. For the molding, an independent molding die having a dedicated shape corresponding to the machining shape of the respective works Wa and Wb is used, and for each predetermined molding part, for example, as shown in FIG.
As shown in, the draw (No1), the first piercing and trimming (No2), the second piercing and trimming (No3), the list and flanging (No)
4) and the like, and the molding process has been performed.

[0003]

Therefore, in the conventional press forming method and its apparatus, many forming steps (2 × 4 = 8 steps) are required depending on the type of the work and the processing shape, and it is necessary to cope with this. Then, a dedicated molding die (8 pieces) is required for each molding step.

As a result, there is a problem that the manufacturing cost of the molding die itself increases significantly.

[0005]

The present invention has been made for the purpose of solving the above problems, and is constituted by the following means for solving the problems.

That is, first, in the press forming method of the present invention, in a press forming method of press forming different kinds of works in a plurality of steps, a plurality of molds used corresponding to each press forming step of the respective works are used. The dies in a predetermined press molding process are designed to be common and press-molded without causing interference according to the lap state when the above-mentioned works are superposed.

Next, the press-forming apparatus of the present invention is a press-forming apparatus for press-forming different kinds of works in a plurality of steps, of a plurality of molds used corresponding to each press-forming step of each work. The molds in a predetermined press molding process are formed in common without interfering with each other in accordance with the lap state when the above-mentioned works are overlapped.

Therefore, according to the press-forming method and the press-forming apparatus having the above-mentioned structure, the die manufacturing cost is reduced by a predetermined number of steps in which the die is commonly used, the cost is reduced, and the processing station for executing the step is executed. Since it itself can be shared, the installation space can also be saved.

[0009]

As a result of the above, according to the press molding method and apparatus of the present invention, low cost and space saving
It is possible to provide a press molding line with high molding efficiency.

[0010]

Embodiment 1 FIGS. 1 to 3 show a press molding method and a press molding method according to Embodiment 1 of the present invention applied to press molding of left and right rear inner panels of an automobile, for example. The structure of the press molding apparatus for implementing is shown.

First, FIG. 1 shows a press molding process for carrying out the above-mentioned press molding method. As for the press molding of the left and right rear inner panels of automobiles, which are heterogeneous articles, the molding process itself is, as already mentioned in connection with the prior art,
Draw process No. 1 in which each of the workpieces Wa and Wb after blanking is drawn so as to have a substantially product shape, and the portions of the workpieces Wa and Wb that are unnecessary as products are punched out.
The first trimming and piercing process No2 for making the necessary straight holes in each part, as well as the workpieces Wa, W
2nd trimming and piercing process No3 in which the unnecessary part of b left is cut off and a hole is formed in a diagonal direction, the edges are properly folded and the nuts are crimped until the workpieces Wa and Wb have the final shape of the product. The list and flanging process No. 4 is performed. Then, as shown in FIG.
All processes of No. 4 were performed using independent molding dies for each of the left and right works (left and right rear inner panels) Wa, Wb.

On the other hand, in the embodiment of the present invention,
For example, as shown in FIG. 1, the above No 1, No 2 and N
Although each step of o4 is press-molded by using an independent molding die as in the conventional case, the second trimming and piercing step of No3 is performed as shown in FIG. Molding with a single (one) press molding machine using the same common molding die that does not interfere with each other depending on the lap state when Wa and Wb are overlapped It is supposed to do.

That is, in the second trimming and piercing step No3, the press molding apparatus having the above-mentioned common molding die is substantially symmetrical with respect to the state as shown in detail in FIG. Either one of the above-mentioned two sets of works Wa or Wb is sequentially loaded in a lot unit, held and fixed in the same state by a presser, and then the above-mentioned trimming process and piercing process are performed.

When the second trimming and piercing process is completed, the process is transferred to the final list and flanging process of No. 4 as in the conventional case, and the list and flanging process is performed by independent press forming dies. To be executed.

Next, in the No. 3 second trimming and piercing step, two sets of works W are used.
The configuration of the press molding apparatus 25 provided with a single molding die common to a and Wb will be described in detail with reference to FIG.

First, reference numeral 1 is an upper die, 2 is a lower die, and the upper die 1 is provided with an upper die presser 5 for pressing a work at the time of forming, piercing punches 30, 30, an upper die cutting edge 20 for trimming processing, and the like. On the other hand, the lower mold 2 is provided with a lower mold cutting edge 26, a lifter 21 for lifting a work after completion of molding, piercing scrap relief holes 27, 27 and the like.
The piercing punches 30, 30 of the upper die 1 are fixedly supported by the upper die 1 via a piercing punch holder 30a.

The upper and lower mold parts of the press molding device 25 are, for example, different kinds of articles having different molding shapes as described above.
The pair of works Wa and Wb are formed so that they can be molded in common without interfering with each other corresponding to the overlapped state as shown in FIG.

The press molding apparatus 25 having the above-mentioned structure
On the other hand, either one of the works Wa and Wb that has undergone the first trimming and piercing process No2 in each forming line of the above-mentioned two sets of works Wa and Wb is sequentially carried in in a lot unit, and any of the corresponding works Wa and Wb The above-described trimming and piercing processing is performed.

Now, for example, if the work Wa (left rear pillar inner panel) of FIG. 2 is carried in, the trimming portions 11 and 15 are trimmed and the piercing portions 16b, 16b ... Are pierced. .

On the contrary, if the work Wb (right rear pillar inner panel) shown in FIG. 2 is carried in, trimming processing of the trimming portions 13 and 14 and piercing processing of the piercing portions 16b, 16b. Be seen.

When each of the trimming and piercing processes is completed, the lifter 21 is actuated to lift the work Wa or Wb, and the work Wa or Wb is carried out by a predetermined carrying-out means. As shown in FIG. W
Each of a and Wb is returned to an independent molding line and a final list and flanging step (No4) is performed.

The above press forming steps No. 1 to No.
No. 1 first trimming and piercing process independent for each work Wa and Wb in No. 4 and second trimming and piercing process common to No. 3 works Wa and Wb are distributed in the forming process of the present embodiment. If
For example, it is determined in consideration of easiness of scrap processing and processing. For example, for each of the works Wa and Wb in FIG. 2, a portion that can be trimmed or pierced straight from the upper side to the lower side (for example, reference numerals 16a and 17 in FIG. 2). The piercing part) is collectively the first trimming and piercing step No2, and the part that must be trimmed or pierced from diagonally above (the piercing part 16b in FIG. 2) and part of the nut attachment (FIG. The reference numeral 2) and the like are collectively performed in the second trimming and piercing step No3. of course,
This order may be reversed, and the above-mentioned first trimming and piercing step No2 may be performed by one press molding apparatus of the common molding die as described above.

As described above, according to the press forming method and the apparatus therefor according to the first embodiment of the present invention, the different types of workpieces Wa and Wb having different processing shapes are press formed in a plurality of steps No1 to No4. In the press forming method and apparatus thereof, the forming dies in a predetermined press forming step No3 of a plurality of dies used corresponding to the respective press forming steps No1 to No4 of the respective works Wa and Wb, Wa and Wb are commonly formed so as not to interfere with each other in the overlapped state of lapping and press-molded for each.

Therefore, the process N using a common molding die
The mold manufacturing cost is reduced by 3 minutes, the cost is low, and the processing station itself that executes the process can be shared, so that the installation space can be saved.

As a result, according to the press molding method and the apparatus therefor, it is possible to provide a press molding line which is low in cost, space saving, and high in molding efficiency.

The above press forming steps No. 1 to N
It is arbitrary which step of o4 is commonly used to form the molding die. For example, not only the above-described trimming and piercing processing but also flanging processing can be performed.

Further, in the above description, as the work, for example, the case of the rear pillar inner panel of the vehicle body of the automobile has been described. However, the work may be various symmetrical objects such as left and right fender panels at the front and rear of the vehicle body. The present invention can be applied to the above.

Further, in the above description, the respective works Wa, W
Regarding b, the case of the combination of the four steps No1 to No4 has been described. However, the number of steps No1 to Non varies depending on the type of the work, for example, in the case of the fender panel of the car body of the automobile. Further, for example, a process such as bending and flanging is added.

(Embodiment 2) By the way, in the case where the molding dies are commonly formed and press-molded in the predetermined press-molding step as described above, the two sets of work Wa, There may be a case where the holding height is different during the molding of Wb.

Therefore, in such a case, the work holding device 40 having the structure shown in FIG. 4, for example, is further combined with the press forming device 25 shown in FIG.

In the construction of the work holding device 40, the upper die presser portion below the upper die 1 for holding the workpieces Wa and Wb is connected to the upper die presser body 1b and the coil spring 6 with respect to the upper die presser body 1a. And an upper die presser 5 supported so as to be able to move up and down, and holding between the upper surface of the upper die presser 5 and the lower portion of the auxiliary spacer 4 on the lower surface of the upper die 1 which may be caused by the difference in shape between the works Wa and Wb. A stroke adjusting member 3c having a thickness S ₂ corresponding to the height difference is interposed, and the stroke adjusting member 3c is connected to the piston rod 3a.
The upper and lower positions of the upper die presser 5 can be moved up and down within the range of the coil spring stroke S ₃ by inserting / removing the upper die presser 5 with a predetermined stroke S ₁ via the hydraulic cylinder 3.

As a result, for example, in the state shown in the drawing in which the stroke adjusting member 3c is inserted between the auxiliary spacer 4 and the upper die presser 5, the upper die presser 5 descends to lower the punch 7 on the lower die 2. Workpiece W with low holding position with respect to
On the other hand, when the stroke adjusting member 3c is pulled out to the left while the b is properly pressed and held, the upper die presser 5 is raised by the biasing force of the coil spring 6 until it comes into contact with the lower surface of the auxiliary spacer 4, With the lower surface of the work pressing portion pulled up to the state of the imaginary line in the drawing, the work Wa held at a high position is pressed to hold the work in appropriate correspondence with the lower die punch 7.

Therefore, if the work holding device 40 is incorporated into an appropriate portion of the press forming device 25 shown in FIG. 3,
Even when the holding heights of the workpieces at the time of molding are different due to the difference in shape between the workpieces Wa and Wb, it is possible to appropriately deal with the situation.

[Brief description of drawings]

FIG. 1 is a press molding process diagram showing a configuration of a press molding method and a press molding system according to a first embodiment of the present invention.

FIG. 2 is a work layout diagram in a main process of the press molding process.

FIG. 3 is a cross-sectional view showing the configuration of the press molding apparatus according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the structure of a work holding device of a press forming apparatus according to a second embodiment of the present invention.

FIG. 5 is a press molding process diagram showing a conventional press molding method and press molding system.

[Explanation of symbols]

1 is an upper die, 2 is a lower die, 1a is an upper die presser body, 3 is a cylinder, 3c is a stroke adjusting member, 5 is an upper die presser, 6 is a coil spring, 7 is a lower die punch, 20 is an upper die cutting blade, 21 is a lifter, 25 is a press forming device, 26 is a lower cutting blade, 30 is a piercing punch, 40 is a work holding device,
Wa and Wb are works.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B30B 13/00 B30B 13/00 F B62D 65/00 B62D 65/00 A

Claims (12)

[Claims] 1. A press molding method for press-molding different kinds of works in a plurality of steps, wherein a plurality of molds used corresponding to each press-molding step of the respective works are used in a predetermined press-molding step. A press molding method, characterized in that the molds are press-molded in common without interfering with each other in accordance with a lap state when the above-mentioned works are overlapped. 2. The press molding method according to claim 1, wherein the different kinds of works are press molded articles which are substantially symmetrical to each other. 3. The press molding method according to claim 1, wherein the different kinds of works are part of left and right vehicle body panels of the vehicle. 4. The press molding method according to claim 1, wherein the predetermined press molding step is a piercing step. 5. The press molding method according to claim 1, wherein the predetermined press molding step is a trimming step. 6. The press molding method according to claim 1, wherein the predetermined press molding step is a flanging step. 7. A press forming apparatus for press forming different kinds of works in a plurality of steps, wherein a plurality of dies used in correspondence with each press forming step of the respective works are used in a predetermined press forming step. A press forming apparatus characterized in that a mold is formed in common without causing interference in correspondence with a lap state when the above-mentioned works are overlapped. 8. The press forming apparatus according to claim 7, wherein the different kinds of works are press formed articles which are substantially symmetrical to each other. 9. The press forming apparatus according to claim 7, wherein the different kinds of works are part of left and right vehicle body panels of the vehicle. 10. The press molding apparatus according to claim 7, 8 or 9, wherein the predetermined press molding step is a piercing step. 11. The press molding apparatus according to claim 7, 8 or 9, wherein the predetermined press molding step is a trimming step. 12. The press molding apparatus according to claim 7, wherein the predetermined press molding step is a flanging step.