JP3010972B2 - Press 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 device, that is, a press die, and more particularly, to a press die capable of performing a test on the quality of a press material.

[0002]

2. Description of the Related Art Cracks and necking, which are one of the defects that occur suddenly in a press product manufacturing plant, are usually found only when they are finished products. Therefore, it is difficult to determine the cause of these defects at the time of press molding. Moreover, even if the steel sheet is a pressed material that can quantitatively determine the characteristic value as a material for determining the cause of these defects, it is necessary to find a defect and hand the test piece to the press material manufacturer before reaching a conclusion. Usually takes 1-2 weeks.

[0003]

Therefore, when a press material such as a steel plate is press-formed with a conventional press die, a large number of useless defective products are produced, or the press material defect is a cause. Nevertheless, it was not possible to completely eliminate the possibility of causing secondary defects due to erroneous measures such as correcting the mold shape and molding conditions.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a press die which advantageously solves the above-mentioned problems, and a press apparatus according to claim 1 of the present invention, that is, a press die. In addition to the mold portion for processing the press product, a test shape portion for deforming a coil-shaped press material to be processed into the press product into a predetermined test shape by the mold shape portion, The press device, that is, the press die according to claim 2, further comprising: a test shape portion standby means for setting the shape portion to a standby state in which the press material is not deformed into the test shape. In addition to the mold portion for processing the product, a preforming portion for forming a press material to be processed into the press product by the mold portion into a predetermined preliminary shape, and a portion formed to the preliminary shape. The given A test-shaped portion for deforming the test shape, is characterized in that the provided.

[0005]

In the press apparatus according to the first aspect of the present invention, when the apparatus is, for example, a blank mold, the mold shape portion is formed before the blank processing for forming a blank as a press product. For the portion of the coiled press material that forms the scrap at the tip end of the coil-shaped press material, a material test can be performed in which the test shape portion of the blank mold is deformed into a predetermined test shape. Since the determination can be made beforehand, it is possible to prevent the useless use of the press material due to useless blanking work on the press material that may cause cracking or necking.

In the press apparatus according to the second aspect of the present invention, when the apparatus is, for example, a press-forming die, the die-shaped portion is used when the press-forming for forming the press product is performed. For the scrap part of the press material to be formed into a part other than the part to be pressed, the preforming part of the press mold is formed into a predetermined preform, and the part formed into the preform is subjected to a predetermined test by the test part. Since it is possible to perform a two-step material test for deforming into a shape, the quality of the material itself as the pressed product can be determined with higher accuracy at the time of press molding, so that cracks or If necking occurs,
Immediately and accurately judge whether the cause is defective press material or not, and produce a large number of useless defective products, or take erroneous measures such as correcting the mold shape and molding conditions by erroneously determining the cause of the defect. It is possible to reliably prevent a secondary defect from being generated.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1A and 1B are a plan view and a plan view showing a lower mold of one embodiment of a press apparatus of the present invention applied to a press mold for forming an inner panel of an automobile door by restriking. FIG. 4 is a cross-sectional view showing a vertical cross section of the press mold at a position of a line AA,
The press forming die 1 of this reference example includes a lower die 2 and an upper die 3, and the lower die 2 and the upper die 3 serve as a die-shaped portion for processing a pressed product, and are generally used in a pre-process. It has a restrike forming punch 5 and a restrike forming die 6 for performing restrike forming on a press material 4 which is a steel plate formed in the shape of an inner panel of a door for a store.

Further, the lower mold 2 and the upper mold 3 here are
As a test shape portion for deforming the press material into a predetermined test shape, for example, as shown in FIGS.
A test molding die 7 having a substantially hemispherical concave portion for deforming a part of the press material 4 into a conical cup shape having a cross section length L of 1.4 times the diameter D (L = 1.4 D);
And a test molding punch 8 having a substantially hemispherical convex portion. Here, the test molding die 7 and the punch 8 are, as apparent from FIG. Of the scrap portion 4a that is punched out to form the window opening in the post-process, particularly in the arrangement corresponding to the central portion, which is a portion that is hardly affected by the restric-like forming and the press forming in the previous process, The lower mold 2 and the upper mold 3 are installed respectively.

When the press material 4 is subjected to restric-like molding using the press mold 1, the lower mold 2 and the upper mold 3 of the press mold 1 move closer to each other based on the operation of a press machine (not shown). As a result, the punch 5 and the die 6 for restriking work in cooperation with each other to form a portion of the press material 4 to be an inner panel of the door by restriking, thereby forming a predetermined inner panel shape on the portion. At the same time, the die 7 for test molding and the punch 8 cooperate to form a central portion of the scrap portion 4a of the press material 4 which is to be an opening of the window of the door, with a cross-sectional length L having a diameter D. A material test is conducted to transform the conical cup into a 1.4 times (L = 1.4 D). The test conditions are as follows, as shown by the solid line in FIG. 2 (c), where the required value of the forming limit of the pressed material is usually 35% or more in one direction elongation,
As shown by the point N in FIG.
The tensile test is performed at a test value that results in a% elongation. If no crack occurs in this test molding, it can be determined that the press material 4 has good moldability.

[0010] Therefore, if the press material 4 is subjected to restric-like molding by using the press mold 1 of the above-described reference example, the quality of the press material 4 can be determined at the time of the restric- tive molding. In the case where cracks or necking occur in the restriking molding or the press molding in the preceding process, it is possible to immediately judge whether the cause is a defect of the press material 4, and produce a lot of useless defective products. It is possible to reliably prevent the occurrence of a secondary problem by taking an erroneous measure such as correcting the mold shape or the molding conditions due to misjudgment or erroneous determination of the cause of the defect.

FIGS. 3A and 3B are longitudinal sectional views showing a first embodiment of a press apparatus according to the present invention applied to a blank mold for forming a blank before press forming by blanking from a coil material as a press material. It is an explanatory view showing a front view and a method of performing blank processing on a coil material using the blank mold. In the figure, the same parts as those in the reference example are denoted by the same reference numerals. That is, the blank mold 11 of this embodiment includes a lower mold 12 and an upper mold 13, and the lower mold
12 and the upper die 13 are provided with a cutting die 15 and a cutting punch 16 for forming a large number of blanks of a fixed length by performing a cutting process, which is a type of blanking, on the coil material 14 for each fixed length. Respectively.

Further, the lower mold 12 and the upper mold 13 here are:
As a test shape portion for deforming the press material into a predetermined test shape, for example, as in the above reference example, a test forming die 7 having a substantially hemispherical concave portion and a test forming portion having a substantially semispherical convex portion. And a punch 8, where:
As shown in FIG. 3 (b), the test molding die 7 and the punch 8 cut the scrap portion 14a at the tip of the coil material 14 before the cutting die 15 and the punch 16 cut. The lower die 12 and the upper die 13 are installed at positions closer to the coil material 14 than the die 15 and the punch 16 so as to be formed. The upper die 13 supports the test molding punch 8 so as to be able to move up and down relative to the cutting punch 16, and moves the test molding punch 8 up and down relatively to the cutting punch 16. The wedge-shaped cam member 17 and the cylinder 18 for driving the advance and retreat thereof are
It has as test shape part standby means.

Using such a blank mold 11, a coil material 14
When performing blank processing to form a blank from the press die 19, the cutting die 15 and the punch 16 by repeating the approach and separation movement of the lower die 12 and the upper die 13 of the blank die 11 based on the operation of the press machine 19. Cooperate with each other to cut the coil material 14 which is fed by a constant length to the right in the figure by a feeder (not shown) at regular lengths. Here, prior to blanking, first, the cylinder 18 is moved by the cam member 17. To move the test-forming punch 8 relatively downward with respect to the cutting punch 16, and then the lower mold 12 and the upper mold 13 of the blank mold 11 described above.
The die 7 for test molding and the punch 8 cooperate with each other to move the scrap portion 14a at the tip end of the coil material 14.
Is subjected to a material test in which the material is transformed into a conical cup shape under the same test conditions as in the previous example. If no cracks occur in this test molding, it can be determined that the coil material 14 has good formability. Thereafter, the cylinder 18 moves the cam member 17 backward to move the test molding punch. The blanking is performed after the test molding punch 8 is moved up relative to the cutting punch 16 so as not to interfere with the coil material 14.

Therefore, if the blanking of the coil material 14 is performed using the blank mold 11 of the above embodiment, the quality of the coil material 14 can be determined before the blanking. In addition to the same effect as described above, it is also possible to prevent a useless blanking operation and a useless use of the coil material 14 due to the work.

FIG. 4 shows an example of test molding in two steps which can be performed in place of the test molding in one step shown in FIG. 2. In this example, first, in the first step, FIG. (A)
As shown in FIG. 3, two elongated holes parallel to each other are punched out in the scrap portion of the press material 20, thereby forming a tensile test portion 20a as a preliminary shape in the scrap portion. As shown in (b) and (c), the tensile test portion 20a is pressed by a test forming punch such as a half portion of a round bar vertically divided into two long holes at both ends. Thus, it is tested whether or not the tensile test portion 20a breaks as shown in the drawing.

When the test shape part for the test molding performed in the two steps is provided in, for example, a press mold, the first step is a rough mold, and the second step is a subsequent restrike mold. In the case of a blank type.
The step and the second step may be provided adjacent to each other in the blank mold, and may be installed in one mold so as to constitute a progressive die.

According to the test molding performed in these two steps, FIG.
As shown in (b) and (c), it is particularly advantageous when it is desired to perform a material test only in a specific direction. In the example shown in FIG. .
A material test is conducted in which the material is deformed and pulled into an arc shape which is four times (L = 1.4 D). It should be noted that the test condition is that the required value of the forming limit of the pressed material is usually 35% or more in one direction elongation as shown by the solid line in FIG.
In consideration of the margin, a tensile test is performed at a test value of 40% elongation in one direction as shown by a point N in the figure, and a tensile fracture as shown in the drawing must be generated by this test forming. If so, it can be determined that the press material 20 has good formability.

Although the present invention has been described with reference to the illustrated examples, the present invention is not limited to the above-described examples. For example, the test shape portion may be formed by deforming the pressed material into a shape other than the above examples.

[0019]

As described above, according to the pressing device of the first aspect of the present invention, the quality of the press material itself can be judged before blanking, so that the waste of the press material that causes cracks or necking can be determined. It is possible to prevent an unnecessary blanking operation and a wasteful use of the press material.

According to the press apparatus of the second aspect of the present invention, the quality of the material itself as a pressed product can be determined with higher precision at the time of press molding, so that a product formed from the pressed material can be used. When cracks or necking occur, it is possible to immediately and accurately determine whether the cause is a defective press material, and to produce a large number of useless defective products, or to determine the mold shape and molding conditions by erroneously determining the cause of the defect. It is possible to reliably prevent a secondary problem from occurring by taking an erroneous measure such as correction.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are a plan view showing a lower mold of a press mold as a reference example of the press apparatus of the present invention, and the press mold at the position of line AA in FIG. It is sectional drawing which shows a longitudinal cross section.

FIGS. 2A and 2B are a plan view and a cross-sectional view taken along a line BB of a press material deformed by an example of a test forming part including one process which can be provided in the above-described reference example. (C) is an explanatory diagram showing test values in the material test.

FIGS. 3 (a) and 3 (b) are longitudinal sectional views showing a blank die which is an embodiment of the press device of the present invention, and a description showing a method of blanking a coil material using the blank die. FIG.

FIG. 4 (a) shows an example of a two-step test forming section of another embodiment of the press apparatus of the present invention which can be performed in place of the test forming in one step of the above-mentioned reference example. It is a top view which shows the press material deformed by (a), (b) and (c) are the top views which show the press material which the test molding part deformed in the 2nd process, and the position in the position of CC line. It is sectional drawing, (d) is explanatory drawing which shows the test value in the material test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press forming die 2 Lower die 3 Upper die 4 Pressing material 4a Scrap part 5 Restoring forming punch 6 Restoring forming die 7 Test forming die 8 Test forming punch 11 Blank die 12 Lower die 13 Upper die 14 Coil material 14a Scrap part 15 Cutting die 16 Cutting punch 17 Cam member 18 Cylinder 19 Press machine 20 Press material 20a Tensile test section

Claims (2)

(57) [Claims] In order to deform a coil-shaped press material to be processed into a pressed product by using the die-shaped portion in addition to a die-shaped portion (5, 6) for processing a pressed product into a predetermined test shape. Test shape part (7, 8) and the test shape part
Waiting for the pressed material not to deform into the test shape.
Test shape part standby means (17, 18) for bringing into a state
And a press device. 2. In order to form a press material, which is to be processed into a pressed product by processing in the die shape portion, into a predetermined preliminary shape, in addition to a die shape portion (5, 6) for processing a pressed product.
A preformed portion, and a test shape portion (7, 8) for deforming the portion formed into the preform into a predetermined test shape ;
A press device characterized by comprising: