JPS6036846B2 - Panel positioning method during press processing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for positioning a panel in press working for obtaining a panel product through a trimming process following a drawing process.

For example, in the case of pressing the outer panel of an automobile door, press working is performed in the order of a drawing process, a trim process, and then a flange process.

Examples of molds used in such a drawing process include those shown in FIGS. 1 and 2, respectively. That is,
The aperture mold shown in FIG.
A die 3 fixed to the lower holder 2, a punch 5 fixed to the lower holder 2 and working together with the die 3 to squeeze the panel 4, a blank holder 6, and a punch 5 fixed to the lower holder 2 and corresponding to each green of the panel 4. It has a positioning nest 7 to support the positioning.
Further, the trim mold shown in FIG. 2 includes a pair of upper and lower holders 8 and 9 which are provided so as to be able to approach and separate from each other, a pad 10 supported by the upper holder 8, and a pad 10 fixed to the lower holder 9. and the squeezed panel 4 cooperates with the pad 10.
a punch 11 that holds down the product part; an upper blade 12 that is fixed vertically downward to the upper holder 8 for trimming the edges of the panel 4 excluding the product part; and a punch 12 that is fixed to the lower holder 9 and A groove 14 serving as a lower blade that constitutes a cutter together with the blade 12 has a first nest 13 formed on its upper surface. By the way, is the panel 4 subjected to the drawing process as mentioned above? The process from the drawing process to the trim process will be explained in more detail.
Before the drawing process, there is a planking process. Next, there is positioning in the drawing process, which is performed in the order of drawing process, positioning in the trim process, and trim process. In these processes, dimensional errors occur in the panel during planking. Panel 4 to the mold in the next drawing process
To position panel 4 in nest 7 as shown in Figure 1,
This is done by touching the green. In this case, in order to facilitate insertion of the panel 4 between the nests 7, the distance between the nests must be made somewhat wider than the dimensions of the panels 4. Therefore, the panel 4 is drawn while being misaligned between the nests 7.
In the panel after processing, the dimension from the edge to the part that will become the product will deviate. In other words, the position of the part that becomes the product will shift from panel to panel. Further, when drawing, the panel 4 flows (ie, is drawn in) toward the inside of the mold, so that the dimension from the product part to the green further changes. For this reason, it is difficult to position the panel using the green color of the panel, and as shown in FIG. This is done by layering the panel 4 on top of both using a first nest 13 having the same shape as the first nest 13. However, if the aperture is shallow, the panel 4 tends to move on the punch 11, making it impossible to position it reliably. Therefore, as shown by the imaginary line in FIG. 2, the second nest 15 may be brought into contact with the green panel 4 to assist in positioning.
For the same reason as the positioning nest 7 in the drawing process, the interval between them is set larger than the dimensions of the panel. Therefore, also here, the position of the panel 4 is shifted between the second nests 15, and the dimension from the product part to the green is not constant. As mentioned above, in the method of positioning panels in secondary press processing, the dimension from the drawn product part of the panel to the green varies from panel to panel and is not constant, and the size of the panel is not fixed in the trim process. Accurate positioning was difficult. This invention was made by focusing on the above-mentioned conventional problems, and involves forming a folded part in the green part of the panel in the drawing process, and then folding the folded part when putting the panel into the trim mold in the next process. The purpose of this paper is to solve the above problem by positioning using the parts.

The present invention will be explained below based on the drawings.

3, 4, and 5 are diagrams showing an embodiment of the present invention.
It should be noted that the same parts as those in the prior art are given the same reference numerals and the description thereof will be omitted. First, to explain the structure, FIG. 3 shows a press die, and 16 is a nesting punch fixed on the lower holder 2. The nesting punch 16 is provided adjacent to the outside of the blank holder 6. The nesting punch 16 is also provided equidistantly from the punch 5 at a position where the green part of the panel 4, that is, the four corners of the panel 4 are located. The top of the nesting punch 16 projects upwardly from the top of the punch 6, and cooperates with the die 3 to bend the four corners of the panel 4 upward. Also the third
Although not shown in the figure, there is a panel 4 on the lower frame 2.
Positioning nests 7 are provided at appropriate locations for each green other than the four corners, as in the prior art. Next, the effect will be explained.

In a state where the upper holder and the lower holder 2 are separated from each other, the panel 4 is positioned so that each green is in contact with the nest 7, and is remounted on the rising blank holder 6.

Next, the upper holder is brought close to the lower holder 2, the panel 4 is held between the die 3 and the blank holder 6, and the punch 5 is used to draw the panel 4. When this drawing process is almost completed, the four corners of the panel 4 that protrude outward from the die 3 are removed by the nesting punch 1 that protrudes upward.
6 and then bends upward to form a bent portion 18 as shown in FIG. FIG. 4 shows the panel 4 that has undergone this drawing and bending process. The positional relationship between the folded portions 18 and the product portions, that is, the distances from the product portions to the respective folded portions 18, are constant regardless of the flow of the panel 4 that occurs during the drawing process as described above. Next, the panel 4 that has been transferred to the trim mold is placed with the product part on the punch 11 and the end part placed on the first nest 13, and each of the folded parts 18 placed on the second nest 15. Accurate positioning is achieved by being assisted by each. The first reason is that the positioning of the panel 4 for trimming is performed by the bent portion 18 formed at a certain distance from the product part as described above, which is different from the conventional positioning performed by the green of the panel 4. The difference is that this is done regardless of the indeterminacy of the dimensions from the product part to the green. Secondly, since each edge of the panel 4 is tightly attached to the second nest 15,
This is to prevent positional deviation between the second nests 15 and the second nests 15. The panel 4 that has been accurately positioned in this way is moved by the upper holder 8 approaching the lower holder 9.
The pad 101 is pressed onto the punch 11, and the unnecessary end portion including the bent portion 18 is trimmed by a cutter composed of an upper blade 12 and a groove 14. It is desirable that the bent portion 18 be formed at the corner of the panel 4 as described above. This is because corners have less flow caused by drawing than other edges, and the distance from the corners to the product is relatively long, making them easier to bend. Furthermore, when the product panel is trimmed, the bent portion 18 is cut off as described above, so that it has no effect on the product panel. As explained above, according to the present invention, a folded portion is formed on a part of the edge of the panel in the drawing process, and the folded portion is used to position the panel when it is placed in a trim mold in the next process. This makes it possible to position the panel extremely easily.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a part of a conventional press mold, Figure 2 is a sectional view showing a part of a conventional trim mold, and Figure 3 is a sectional view showing a part of a conventional trim mold.
The figure is a sectional view showing a part of an embodiment of the press die according to the present invention, FIG. 4 is a perspective view of a panel drawn and bent by the press die of FIG. 3, and FIG. FIG. 2 is a sectional view showing a portion of an embodiment of a trim type. 3... Dice, 4... Panel, 5, 6... Punch, 7...
...Nest, 12... Upper blade, 13... First nest, 14... Groove, 15... Second nest, 16...
...Nest punch, 17...Shoulder, 18...
...Bending part. Figure 1 Figure 4 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] 1. In a press process in which a panel product is obtained through a trimming process after the drawing process, a folded part is formed in a part of the edge of the panel in the drawing process, and then when the panel is placed in a trim mold, the above-mentioned A method for positioning a panel in press working, characterized by positioning using a bent part. 2. The panel positioning method in press working according to claim 1, wherein a part of the edge of the panel is a corner of the panel.