JP3489318B2 - Drawing press forming equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming apparatus provided with a die, a punch and a blank holder, and more particularly to a drawing press forming apparatus for preventing the occurrence of a forming defect called a die contact scratch.

[0002]

2. Description of the Related Art Some drawing press forming apparatuses are provided with two sets of drawing press dies arranged on a common bolster and a slide so as to simultaneously form different molded articles.

For example, in a large-sized transfer press machine, as shown in FIG. 9, two sets of press dies that share a bolster and a slide are installed on each of the stages S _{1 to} S ₅ , respectively. An outer panel and an inner panel, which are typified by an opening / closing body, are set as a set and simultaneously molded by the two sets of press dies.

In the example shown in FIG. 9, the drawing (drawing) step S ₁ except the idle step S ₁₁ , the trimming step S ₂ , the piercing step S ₃ , the flange / piercing step S ₄ , and the cam flange step S _{5 are performed.}
In this order, two sets of press dies P ₁ , P ₂ , P ₁₁ , _12, ... Are installed, and one press die group P ₁ , P ₁₁ , P _{21 ,} .
The inner panel W ₁ together with the molding, the outer panel W ₂ to be combined with the inner panel W ₁ is molded by the other pressing tool group _{P 2, P 22, P 32} ... as a molded article by.

In particular, when focusing on the drawing step S ₁ , since the outer panel W ₂ and the inner panel W ₁ having different forming pressures are formed at the same time, each drawing press die shown in FIG. The parallelism between the die 1 of P ₁ and P ₂ and the blank holder 2 may be impaired. Therefore, one of the die 1 and the blank holder 2, for example, the blank holder 2 as shown in FIGS. The cylindrical distance blocks 3 are installed at the four corners. This distance block 3
By abutting against the die 1 on the other side, the minimum clearance between them is regulated, and the die 1 and the blank holder 2
Will maintain parallelism with.

The blank holder 2 is arranged on the outer periphery of a punch 5 which forms a lower mold 4 together with the blank holder 2, and the blank holder 2 is provided with a cushion pin 6 for cushioning a die cushion device (not shown). The pad is elastically supported so that it can move up and down. 7 is a bolster, and 8 is a slide (ram).

[0007]

In the conventional structure as described above, the die 1 and the blank holder 2 of each drawing press die P ₁ , P ₂ are operated by the function of the distance block 3.
Even if the parallelism with the can be maintained, the slide 8 of the press machine bends due to the difference in the molding pressure between the outer panel W ₂ and the inner panel W ₁ that are simultaneously drawn as described above, and this causes the influence. Particularly, the parallelism between the punch 5 and the die 1 in the drawing press die P _{2 having} a smaller molding pressure may be broken. As a result, as shown in FIG. 11, a defect Q called a die contact scratch occurs in a part of the outer panel W _{2 having} a smaller molding pressure, and improvement of molding quality cannot be expected.

[0008] The term "mold contact scratch" used herein means that the molding surface on the punch 5 side and the molding surface on the die 1 side become non-uniform due to the poor parallelism between the punch 5 and the die 1, and as a result, This is a phenomenon in which unevenness is generated on the panel surface due to local reduction in plate thickness as shown in FIG. 12A is a regular plate thickness, and b is a plate thickness reduction amount.

On the other hand, the above-mentioned problems can similarly occur in a general single-action type or double-action type draw press forming apparatus in a so-called tandem press line other than the transfer press machine.

For example, in a double-action type draw press forming apparatus for press-constraining a blank material with a die and a blank holder, and then pressing the blank material to the die side by a punch to form a predetermined shape, There is no means for directly controlling the parallelism between the molding surfaces of the punch and the minimum clearance. Therefore, the clearance between the molding surfaces of the die and punch may be locally reduced due to the machining error of the die or punch molded product during the die manufacturing or the motion accuracy error such as the parallelism of the press machine. Similarly, the pattern hit phenomenon occurs. In order to prevent such a die contact phenomenon, the work of rubbing the forming surfaces of the die and the punch must be repeated many times, resulting in an increase in the number of steps for adjusting the die accuracy, which is not preferable. .

Further, even if the precision between the die and the punch can be ensured as a result of the above-mentioned grinding, if the press die is to be used in another press machine, the difference in the motion precision of each press machine is different. Because of this, the original accuracy cannot be reproduced, and if the press machine changes, the above-mentioned grinding work must be carried out each time, so the number of man-hours cannot be reduced.

The present invention has been made in view of the above problems, and is free from the influence of the subtle motion accuracy error peculiar to each press machine and the machining error of the molding surface of the die and the punch. By making it possible to always maintain the parallelism between both molding surfaces and the minimum clearus, it is possible to prevent the occurrence of scratches on the mold, and at the same time, it was required in the past every time the mother press machine changed. An object of the present invention is to provide a squeeze press forming apparatus that makes it possible to easily reproduce the parallelism between the die and the punch and the minimum clearance even in different press machines, while eliminating the work of grinding the die and the punch. There is.

Further, according to the present invention, even when two molded products having different molding pressures are simultaneously drawn, the parallelism between the punch and the die and the minimum clearus in the drawing press die having the smaller molding pressure can be obtained. It is an object of the present invention to provide a drawing press forming apparatus which can be maintained and prevent the occurrence of scratches on the die.

[0014]

According to a first aspect of the present invention, the peripheral portion of the blank material is pressure-constrained by the die and the blank holder, and the portion other than the peripheral portion of the blank material is punched by the die side. in drawing press molding apparatus designed to mold the diaphragm into a prescribed shape is pushed in, the die Contact
And one of the blank holders contacts the other
By doing so, the parallelism between both mold surfaces and the minimum clear
With a distance block to regulate the lance
Moni, one of the forming of the die and punch
Surface and other than the final product shape part of the blank material
Localize toward the other molding surface on the part corresponding to the part
To project a minute amount and contact the other molding surface
Further , it is characterized in that a distance seat portion for restricting the parallelism between both molding surfaces and the minimum clearance is formed .

[0015]

The invention according to claim 2 is characterized in that, in the invention according to claim 1 , a distance seat portion is formed on the entire circumference of the peripheral edge portion on one molding surface.

The invention according to claim 3 is characterized in that the distance sheet portion in the invention according to claim 2 is formed on the molding surface of the die.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the distance sheet portion protrudes from the molding surface on which the distance sheet portion is formed. It is characterized by being set to about 10 to 25% of the plate thickness of the blank material.

According to a fifth aspect of the present invention, two sets of lower dies each consisting of a punch and a blank holder are arranged in a common bolster, and a pair of dies which are combined with each of the lower dies to form a drawing press die. Supported on a common slide,
Further, one of the blank holder and the die is provided with a distance block which regulates the parallelism and the minimum clearance between the blank holder and the die by abutting the other, and the two blank press dies are provided with the distance block. This is a drawing press molding machine that simultaneously molds different molded products by performing drawing processing on the
It is assumed that Then, as the insert die, a plurality of locations along the portion other than the final product shape portion of the blank material, which is the molding surface of the die of the one of the two drawing press dies with a small molding pressure, is used as the insert die. Divide and insert this insert die by a small amount in the punch direction from the die molding surface to contact the punch side molding surface.
By doing so, the parallelism between both molding surfaces and the minimum clear run
The feature is that it is a distance seat part that regulates the clearance.

According to a sixth aspect of the invention, the insert die according to the fifth aspect of the invention is detachable from the die, and a shim plate is interposed between the upper surface of the insert die and the die. It is characterized by

According to a seventh aspect of the invention, the insert die according to the fifth aspect of the invention is arranged so as to be vertically movable so as to face the side surface of the die, and the ascending operation of the die from the bottom dead center position is started. Immediately after that, the insert die is raised by a predetermined amount with respect to the die, and the insert die is lowered by the predetermined amount before and after the time when the top dead center position of the die is reached. There is.

According to an eighth aspect of the present invention, an inclined cam surface is formed on the upper surface of the insert die according to the seventh aspect of the present invention, and an insert die side is provided between the insert die and the die. A backup key having an inclined cam surface that is in sliding contact with the inclined cam surface is inserted, and the insert die moves up and down according to the sliding operation of the backup key.

[0023]

According to the invention described in claim 1, a die and
In the distance block provided between the blank holder
In addition to the distance function by
Distance sheet formed on either molding surface
Part is exerted distance function by contacting the other of the forming surface, it is possible to maintain the parallelism and minimum clearance between them, respectively, the press machine specific motion accuracy error and the molding becomes base Even if there is a machining error on the surface, it is not affected by it, and it is possible to prevent the occurrence of scratches due to the mold contact and thus the mold contact to improve the molding quality. Further, it is possible to reduce the man-hours by eliminating the work of rubbing between the die and the punch, which has been indispensable in the past, and it is possible to reproduce the parallelism between the die and the punch very easily even in different press machines. In addition, if the distance seat part is one molding surface
Since it protrudes only a minute amount from the
At the part where the distance seat is pressed, the thickness of the part is locally reduced.
Although a small amount will occur, the distance seat
The installation position should be set in advance except for the final product shape part of the blank material.
Of the blank material
The portion pressed against the chest seat will be trimmed in a later process.
What is the quality of the product (molded product) from being removed
There is no problem.

[0024]

According to the invention as set forth in claim 2, since the distance sheet is formed on the entire circumference of the peripheral edge of one molding surface, in addition to the effect similar to that of the invention as set forth in claim 1 , the distance sheet is provided. This has the effect of ensuring a larger seat area and stabilizing the distance function.

According to the invention described in claim 3, since the distance sheet portion is formed on the molding surface on the die side into which the punch enters, in addition to the same effect as the invention described in claim 2, As compared with the case where the distance sheet portion is formed on the punch-side molding surface, there is an effect that a larger area of the distance sheet portion can be secured.

According to the invention as set forth in claim 4, the amount of protrusion of the distance sheet portion is set to about 10 to 25% of the plate thickness of the blank material to be formed . In addition to the same effect as the invention described in any one, a necessary and sufficient distance function can be obtained without affecting the molding quality.

According to the invention described in claim 5, a portion of the die along the portion other than the final product shape portion of the blank material is divided as an insert die, and this insert die is only a minute amount in the punch direction from the die face. By projecting the distance seat part, this insert die ensures the parallelism and the minimum clearance between the die and the punch. It is possible to improve the molding quality without causing a molding defect called a scratch on the molded product.

According to the invention described in claim 6, the insert die be detachable with respect to the die, since the shim plate is interposed between the insert dies, to claim 5 In addition to the same effects as the described invention, there is an advantage that the clearance between the die and the punch and the parallelism can be easily adjusted by, for example, replacing the shim plate with one having a different thickness.

According to the invention as set forth in claim 7 , the insert die moves up and down in response to the raising and lowering operation of the die, and the insert die rises relative to the die especially during the raising operation of the die. When the gripper of the transfer device for transferring the work enters the drawing press die with the approach path near the insert die in parallel with the ascending operation, the interference between the insert die and the gripper can be prevented. The press line or transfer press can be operated at higher speed.

According to the invention described in claim 8, since the insert die moves up and down according to the sliding operation of the backup key that backs up the insert die, the same effect as that of the invention described in claim 7 is obtained. In addition, even if the insert die moves up and down positively with respect to the die as described above, the height position of the insert die required for parallelism adjustment and clearance adjustment between the die and the punch can be easily adjusted. There is an advantage that can be reproduced.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a first embodiment of the present invention, in which parts common to those of the conventional example shown in FIGS.

As shown in FIG. 1, the drawing press die P ₂ for forming the outer panel W ₂ is a portion of the die face (forming surface) 1a of the die 1 which faces the corner portion on the punch 5 side. The receiving space 9 is formed in
An insert die 10 having an auxiliary die face 10a continuous with the die face 1a is detachably fitted in the receiving space 9 and is fixed by a bolt 11.

As shown in FIG. 2, the insert die 10 is a portion of the blank B other than the final product shape portion Pa which will be the outer panel W ₂ as a final molded product, and the final product. Four pieces in total are arranged at positions relatively close to the corners of the shaped portion Pa. That is, as shown in FIGS. 1 and 2, in the blank material B formed by drawing, the non-product portion region S attached to the outer periphery of the final product shape portion Pa is trimmed from the trim line L in the subsequent process, and then the final product. A flange portion F for hemming connection with the inner panel W ₁ of the opposite side at the outer peripheral edge of the product shape portion Pa
The insert die 10 is installed in the blank material B at a position corresponding to the non-product part region S because the product is bent.

A shim plate 1 having a predetermined thickness is provided between the insert die 10 and the bottom surface 9a of the receiving space 9.
As shown in FIG. 3, the auxiliary die ace 10a of the insert die 10 projects a minute amount C toward the punch 5 side from the die ace 1a to function as a distance seat portion. Thus, at the bottom dead center position of the die 1, the auxiliary die ace 10a of each insert die 10 is evenly pressed against the punch 5 via the blank B to maintain the parallelism between the die 1 and the punch 5.

As described above, according to this embodiment, as shown in FIGS.
Since the insert die 10 is provided in addition to the existing distance block 3 shown in FIG. 0, it goes without saying that the distance block 3 ensures the minimum clearance and parallelism between the die 1 and the blank holder 2. The insert die 10 ensures the parallelism and the minimum clearance between the die 1 and the punch 5.

Therefore, as shown in FIG. 10, when the outer panel W ₂ and the inner panel W ₁ having different molding pressures are simultaneously molded by the two drawing press dies P ₁ and P ₂ arranged in parallel, Even if the slide 8 of the press machine bends due to the difference in molding pressure, the parallelism between the die 1 and the punch 5 of the drawing press die P ₂ is not hindered, and the conventional parallelism is achieved. It is possible to prevent the occurrence of scratches on the die due to poor contact.

If a die hit occurs during the production of the outer panel W ₂ , the insert die 10 at a predetermined position is once removed and then the insert die 1 is removed.
0 or the shim plate 12 may be replaced with one having a different thickness, which makes it possible to very easily correct the parallelism between the die 1 and the punch 5, and to quickly restore the parallelism to the original state. .

Here, as shown in FIG. 3, since the auxiliary die face 10a of the insert die 10 projects toward the punch 5 by a minute amount C from the die face 1a, the insert die 10 of the blank material B is The pressed portion is pressed more strongly than the other portions, resulting in a decrease in plate thickness e and a scratch on the die, and a gap β between the blank material B and the die face 1a. However, the above-mentioned decrease in plate thickness e and scratches on the die occur only in a portion of the blank B other than the final product shape portion Pa, and are trimmed as the non-product portion area S in the subsequent process, so that the product function is improved. There is no hindrance, and even if the gap β is generated, the blank material B is stretched by the molding pressure and adheres faithfully to the molding surface 5a of the die 5, which causes a problem in molding accuracy. There is no such thing.

FIG. 4 is a diagram showing a second embodiment of the present invention, which is different from the first embodiment in that the insert die 20 is configured to be positively and vertically driven. .

As shown in FIG. 4, the insert die 20
Are arranged at positions corresponding to the non-product part regions S other than the final product shape part Pa in the blank material B, and at the four corners of the die 1 so as to respectively face the outer surface of the die 1. . The insert die 20 is fitted and supported in a receiving space 21 formed in the die 1 so as to be vertically movable, and is constantly urged upward by a tension coil spring 24 stretched between the insert die 20 and the die 1. ing.

On the lower surface of the insert die 20, in addition to the auxiliary die face 20a which functions as a distance seat portion while continuing to the die face 1a, a constraining surface for constraining the blank material B under pressure with the blank holder 2 is provided. Two
0b is formed, and as shown by the solid line in FIG. 4, in a state where the insert die 20 is at the lower limit position with respect to the die 1, the auxiliary die face 20a projects toward the punch 5 by a minute amount than the die face 1a. Is set to. The minute amount referred to here corresponds to C shown in FIG.

On the other hand, an inclined cam surface 20c is formed on the upper surface of the insert die 20, and a horizontally slidable backup key 22 is provided between the inclined cam surface 20c and the bottom surface of the receiving space portion 21. It is arranged. The backup key 22 is driven forwards and backwards by an air cylinder 23, and an inclined cam surface 22a that slidably contacts the inclined cam surface 20c on the insert die 20 side is formed. Accordingly, the insert die 20 moves up and down by the stroke S ₁ .

Therefore, according to the structure of this embodiment,
As long as the insert die 20 is in the lower limit position with respect to the die 1 as shown by the solid line in FIG.
0 functions exactly like the insert die 10 of the previous embodiment shown in FIG.

That is, since the auxiliary die face 20a of the insert die 20 projects by a minute amount from the die face 1a of the die 1, this auxiliary die face 20a
The contact of a with the punch 1 via the blank B ensures the parallelism and the minimum clearance between the die 1 and the punch 5.

On the other hand, the air cylinder 23 is adapted to expand and contract in synchronization with the raising / lowering operation of the die 1. For example, when the die 1 starts the raising operation from the bottom dead center position, the air cylinder 23 is moved almost at the same time. The contraction operation causes the backup key 22 to retract by a predetermined amount, and the insert die 20 accordingly moves up by the stroke S ₁ . Similarly, at the same time when the die 1 reaches the top dead center position, the air cylinder 23
Is extended and the backup key 22 is moved forward by a predetermined amount, and accordingly the insert die 20 is moved by the stroke S ₁
Only by descending, the state returns to the state shown by the solid line in FIG.

Thus, the insert die 20 moves up and down with respect to the die 1 in accordance with the raising and lowering operation of the die 1.
This is particularly advantageous in avoiding the interference between the gripper of the transfer device for transferring the work and the drawing press die P ₂ .

For example, in the transfer press,
When the die 1 starts to rise from the bottom dead center position, the gripper of the transfer device draws a locus D in the vicinity of the insert die 20 in order to convey the outer panel W ₂ which is a molded product after the draw forming to the next process. While coming into the drawing press die P ₂ . The locus D shown in FIG. 4 merely shows the locus of the gripper with respect to the die 1 which is in the process of ascending.

When the insert die 20 is of a fixed type, it is necessary to wait for the gripper to enter until the entire die 1 rises so that the locus D and the insert die 20 do not interfere with each other. It will be.

On the other hand, in the case of the embodiment shown in FIG. 4, since the insert die 20 ascends with respect to the die 1 by the stroke S ₁ almost at the same time when the raising operation of the die 1 is started, that time is increased. Therefore, the interference between the insert die 20 and the track D of the gripper can be avoided. Therefore, it becomes possible to allow the gripper to enter the drawing press die P ₂ from an early period after the start of the raising operation of the die 1, and thereby the transfer press can be operated at a higher speed.

5 and 6 show reference examples, in which the distance
A double-action type diaphragm that functions as a seat
It shows an example when it is applied to a press die. In addition, this
The reference example has the distance block described above.
Therefore, from the technical scope of the invention described in each claim
Is excluded.

As shown in FIGS. 5 and 6, the drawing press die P ₅₂
Is composed of a die 31, a punch 32, and a blank holder 33, and the punch 32 and the blank holder 33 arranged around the punch 32 substantially function as a die. Then, when the blank material B is put on the die 31, the upper die moves down, and first, the blank holder 33 pressurizes and restrains the peripheral edge portion of the blank material B between the blank holder 33 and the die 31. When 32 is lowered, its molding surface 32a
Then, the blank material B is pushed into the molding surface 31a side of the die 31 and drawn into a predetermined shape.

On the molding surface 31a of the die 31, a distance sheet portion 34 having a minute height h is integrally formed on the entire periphery of the molding surface 31a. This distance seat portion 34
Is formed at the same time when the die 31 is engraved, and is installed at a position corresponding to a portion of the blank material B other than the final product shape portion Pa, and the protrusion height h is the plate thickness of the blank material B. Of about 10 to 25%, which is about 0.1 to 0.2 mm in the case of a general automobile steel sheet and is equal to or less than the maximum allowable dimension of the machining error of the forming surface 31a. Is set to a large value. That is, in the blank material B formed by drawing, since the non-product portion region S attached to the outer periphery of the final product shape portion Pa is trimmed from the trim line L in a later step, the distance sheet portion 34 is included in the blank material B. It is installed at a position corresponding to the non-product part area S.

When the punch 32 descends to the bottom dead center position with respect to the die 31, the forming surface 32a on the punch 32 side passes through the blank material B and the forming surface 31a of the die 31.
Is pressed against the distance seat portion 34 on the side of the die 31 and the molding surface 31 of the punch 32 by the distance function.
The minimum clearance is regulated while maintaining the parallelism between the a and 32a.

Therefore, according to this reference example , FIGS.
As shown in FIG. 6, when the punch 32 reaches the bottom dead center position in the final stage of molding, the entire surface of the distance sheet portion 34 is pressed against the molding surface 32a of the punch 32 through the blank material B, and the die 31 is caused by the so-called distance effect.
The parallelism between the molding surfaces 31a, 32a of the punch 32 and its minimum clearance are secured, and the drawing is completed.

At this time, since the distance sheet portion 34 is projected from the molding surface 31a of the die 31 by the dimension h, the portion of the blank B that is pressed against the distance sheet portion 34 is pressed more strongly than the other portions. , Scratches may occur due to the same effect as the so-called mold contact phenomenon,
Alternatively, a local reduction in plate thickness occurs, and blank material B
As in the first embodiment, a gap β is formed between the and the molding surface 31a of the die 31. However, the above-mentioned scratches on the die and reduction of the plate thickness occur only in a portion of the blank material B other than the final product shape portion Pa, and are trimmed from the trim line L as the non-product portion area S in the subsequent process, so that the product function is obtained. There is no hindrance to the above, and even if the gap β occurs, the blank material B is stretched by the molding pressure and the molding surface 32 of the punch 32 is
Since it closely adheres to a, there is no problem in molding accuracy.

More specifically, for example, as shown in FIG.
If a height m protrusion 35 is generated on the molding surface 32a of the punch 32 due to a processing error that falls within the maximum dimensional tolerance, the protrusion 35 and the die 31 are not formed in the conventional die structure without the distance sheet portion 34. Since the clearance between the molding surface 31a and the molding surface 31a is locally smaller than that of the other portion, the portion of the blank material B that abuts the protrusion 35 as the bending of the die 31 or the punch 32 occurs. It is pressed more strongly than the above, and the scratches due to the mold contact as described above occur.

On the other hand, the distance seat portion 34
According to this reference example having, since the parallelism between the molding surfaces 31a and 32a of the die 31 and the punch 32 is maintained by the contact between the distance sheet portion 34 and the punch 32,
Even if the mold contact damage occurs in the portion corresponding to the distance sheet portion 34, the mold contact damage does not occur in the portion contacting the protrusion 35.

As can be understood from the above description, the die 3
1 and the finishing dimensions of the molding surfaces 31a, 32a of the punch 32 are controlled within ± 0.1 mm, the height dimension h of the distance seat portion 34 is 0.1 to 0. About 2 mm is required.

Further, as shown in FIG. 8, when the punch 32 is inclined and descends at an angle θ due to a motion accuracy error peculiar to the press machine, for example, a parallelism error, in the conventional die structure,
The molding surfaces 31a and 32a of the die 31 and the punch 32 are not parallel to each other, and the clearances between them are not uniform, so that a part of the blank B that should become the final product shape portion Pa locally hits the mold. , Scratches are generated due to the mold hitting.

On the other hand, according to this reference example, even if the punch 32 descends while being inclined by θ, the punch 32 is
Reaches the bottom dead center, the above parallelism error is absorbed due to the distance effect due to the contact between the distance seat portion 34 and the punch 32, and finally the molding surfaces 31a and 32a are separated from each other as in FIG. The entire surface is parallel. Therefore, even if one drawing press die P ₅₂ is used for any of a plurality of press machines, for example, the molding surfaces 31 of both press machines are not affected by the motion accuracy error peculiar to each press machine.
The parallelism between the a and 32a and the minimum clearance can be reproduced very easily, and the occurrence of scratches on the die can be prevented.

Here, in the above-mentioned reference example, the distance seat portion 34 is formed integrally with the molding surface 31a of the die 31 , but the distance seat portion 34 may be formed as an insert die structure as in the first embodiment. The same effect can be obtained.

Further, the distance seat portion 34 has the first
Similar to the embodiment described above, the molding surface 31a of the die 31 is partially formed at four corners, or the molding surface 3 of the punch 32 is formed.
Although it may be formed on the side of 2a, in order to secure the area of the distance sheet portion 34 as large as possible, the distance sheet portion 34 is formed on the molding surface 31 of the die 31.
It is desirable to form it on the entire circumference of the peripheral portion of a.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG.
FIG. 4 is an enlarged cross-sectional view of a main part corresponding to part B of FIG.

FIG. 2 is an explanatory plan view showing the arrangement relationship of the insert dies shown in FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is an enlarged sectional view of an essential part showing a second embodiment of the present invention.

FIG. 5 shows a part of the first and second embodiments as a reference example .
Apply the function to the double action type drawing press type
Sectional view of the.

FIG. 6 is an enlarged view of part D in FIG.

FIG. 7 is an operation explanatory view of the drawing press die shown in FIGS.

FIG. 8 is an operation explanatory view of the drawing press die shown in FIGS.

FIG. 9 is an explanatory plan view of a conventional transfer press machine.

10 is a sectional view taken along the line AA of FIG.

FIG. 11 is an explanatory diagram of a molding defect called a mold contact flaw.

FIG. 12 is an enlarged view of part B of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Die 1a ... Die face (molding surface) 2 ... Blank holder 3 ... Distance block 4 ... Lower mold 5 ... Punch 7 ... Bolster 8 ... Slide 10 ... Insert die 10a ... Auxiliary die face (distance sheet part) 12 ... Shim plate 20 ... Insert die 20a ... Auxiliary die face (distance seat part) 20c ... Inclined cam surface 22 ... Backup key 22a ... Inclined cam surface 23 ... Air cylinder 31 ... Die 31a ... Molding surface 32 ... Punch 32a ... Molding surface 33 ... Blank holder 34 ... distance seat B ... blank P _1, P ₂ ... drawing press type Pa ... final product shape portion S ... non-product area W ₂ ... outer panel (molded article)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinji Ishimoto, 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa, Nissan Nissan Motor Co., Ltd. (72) Takashi Toyama 2- Takara-cho, Kanagawa, Yokohama, Kanagawa Pref. Nissan Motor Co., Ltd. In-house (56) References Kaikaihei 2-42720 (JP, U) Kaikaihei 2-114122 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21D 24/00 B21D 22/20 B30B 15/02

Claims (8)

(57) [Claims] 1. A peripheral edge portion of a blank material is pressure-constrained by a die and a blank holder, and then a portion other than the peripheral edge portion of the blank material is pushed into the die side by a punch to perform draw forming into a predetermined shape. In the drawing press forming device, one of the die and the blank holder is
By contacting the other side, the parallelism between both mold surfaces
A distance block that regulates the minimum clearance
And the molding surface of one of the die and punch.
In addition, on the part of the blank material other than the final product shape part
Locally finely move to the corresponding part toward the other molding surface.
By projecting a small amount and contacting the other molding surface,
A drawing press forming apparatus, characterized in that a distance sheet portion is formed to regulate the parallelism between the two forming surfaces and the minimum clearance. Wherein one of the molding surface according to claim 1 Symbol placement of drawing press molding apparatus wherein the distance seat the entire circumference periphery are formed in. 3. The distance the seat portion according to claim 2 Symbol mounting diaphragm press forming apparatus, characterized in that it is formed on the molding surface of the die. 4. The method of claim projecting amount of the Day stance seat from the molding surface distance seat part is formed, characterized in that it is set to about 10% to 25% of the thickness of the blank 1-3 1. A drawing press forming apparatus according to any one of 1. 5. A pair of lower dies each comprising a punch and a blank holder are arranged on a common bolster, and a pair of dies which are combined with the respective lower dies to form a drawing press die are supported on a common slide. Further, one of the blank holder and the die is provided with a distance block that restricts the parallelism and the minimum clearance between them by abutting the other, and a blank is provided for each of the two sets of drawing press dies. In a draw press forming apparatus that simultaneously forms different molded products by subjecting a material to drawing, it is the forming surface of the die of the one of the two sets of draw press molds that has a smaller forming pressure. In addition, the blank material is divided into multiple parts along the part other than the final product shape part as insert dies. Lee was allowed to protrude by a small amount in the punch direction from the molding surface of the die that is brought into contact with the molding surface of the punch side
Due to the parallelism between both molding surfaces and the minimum clearance
A distance press forming device that regulates the distance. 6. A detachable said insert die relative to the die, wherein, wherein a shim plate is interposed between the upper surface and the die of the insert die
5. Symbol mounting aperture press forming apparatus. 7. The insert die is arranged so as to be movable up and down so as to face the side surface of the die, and the insert die is raised by a predetermined amount with respect to the die immediately after starting the raising operation of the die from the bottom dead center position. and, and back and forth top dead center position reaches the timing and phase of the die aperture of claim 5 Symbol <br/> mounting and characterized in that the insert die is lowered relative to the predetermined amount die press forming apparatus. 8. with the inclined cam surfaces on the upper surface of the insert die is formed, between its insert dies, the backup key having an inclined cam surface in sliding contact with the inclined cam surface of the insert die side It has been inserted, according to claim 7 Symbol mounting aperture press forming apparatus, wherein the insert die is one that moves up and down in response to the sliding operation of the backup key.