JPH07102412B2 - How to trim panel parts - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of trimming a non-product part region which is attached as a blank hold part (wrinkle pressing mark) to a peripheral part of a drawn panel component.

2. Description of the Related Art When a panel component having a relatively small drawing depth, such as a door outer panel or a hood outer panel of an automobile, is formed by drawing, a panel component (here, a door outer panel is used) as shown in FIGS. 4 and 5. Example) W
A non-product part region Q is attached to the peripheral edge of the blank product as a blank hold part (wrinkle pressing mark) including the squeezing bead mark Tb. Therefore, a trimming press die M as shown in, for example, FIG. 6 is used for trimming the non-product portion area Q in a later step (for example, Japanese Patent Publication No. 61-5005).
No. 8 bulletin).

The trimming press die M includes a punch 1 as a lower die, a sectioning die 3 that is fixed to the upper holder 2 and constitutes an upper die 8 together with the upper holder 2 and the pad 4, and is elastically movable up and down to the upper holder 2. The punch 1 and the sectional die 3 are provided with a supported pad 4, and a plurality of lower scrap cutters 5 and upper scrap cutters 6 are attached to the outer periphery of the punch 1 and the sectional die 3 as shown in FIG.

Then, as shown in FIG. 8, the drawing bead mark Tb is fitted to the positioning bead portion 7 formed on the lower scrap cutter 5, so that the panel component W is positioned on the punch 1 and the upper holder 2 is held in this state. Lower it. When the upper holder 2 descends, the pad 4 pressurizes and restrains the panel component W, while the non-product region Q is cut and removed from the trim line 1 by the shearing action of the cutting edges 1a and 3a of the punch 1 and the sectional die 3. To be done. At the same time, upper and lower scrap cutters 5,
Due to the shearing action of 6 pieces, the non-product part area Q is divided into a plurality of short scrap pieces.

Here, the reason why the scrap is divided into a plurality of scrap pieces as described above is to prevent clogging or catching of scrap in a scrap conveying process by a scrap conveyor or the like and facilitate scrap processing.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional trimming method as described above, since the drawn bead trace Tb of the non-product portion area Q is simply fitted to the positioning bead portion 7 of the lower scrap cutter 5, The positioning accuracy of the panel part W with respect to the lower mold is unstable, and a positional deviation is likely to occur particularly in the case of the panel part W having a small drawing depth, which limits the shape accuracy of the panel part after trimming and the speeding up of the press operation. There is.

The present invention has been made in view of the above problems,
The purpose of the trimming method is to be able to position the panel component with respect to the trimming press die securely, thereby improving the shape accuracy of the panel component after trimming and speeding up the press operation. Is to provide.

Means for Solving the Problem The present invention is to trim a non-product part region, which is attached as a blank hold part including a draw bead trace, on a peripheral edge of a draw-formed panel component by a trimming press die, and at the same time, perform a trimming press. In a trim processing method in which the non-product area is divided into a plurality of short scrap pieces by upper and lower scrap cutters provided in upper and lower molds, a plurality of auxiliary members orthogonal to the trace bead traces are formed at the time of draw forming. A panel part is formed by previously forming a bead part in a non-product region and fitting the drawn bead trace and the auxiliary bead part to a T-shaped positioning bead part projectingly formed on the upper surface of the lower scrap cutter during trimming. It is characterized by positioning after trimming.

Function According to this method, in addition to the conventional draw bead mark, the auxiliary bead part that continues in a state orthogonal to this draw bead mark will also fit into the positioning bead part on the lower scrap cutter side, so the position of the panel part By increasing the number of surfaces that determine the position, the posture of the panel component on the lower die is stabilized and the positioning accuracy is improved.

Further, the auxiliary bead portion, which is formed together with the trace of the drawn bead at the time of draw forming, is formed at a portion to be trimmed as a non-product portion area, so that it does not hinder the product shape of the panel component.

Embodiment FIG. 1 to FIG. 3 are views showing an embodiment of the present invention, in which parts common to those of the conventional example are designated by the same reference numerals.

As shown in FIGS. 2 and 3, when the panel component W is formed by drawing, in addition to the conventional drawing bead trace Tb in the non-product part region Q to be the blank hold part, the drawing bead trace Tb is orthogonal to the drawing bead trace Tb. To form a continuous auxiliary bead portion Sb. This auxiliary bead portion Sb is individually provided at a position corresponding to a plurality of lower scrap cutters 15 as shown in FIG.

As is well known, the draw bead trace Tb is formed incidentally as a result of the draw bead on the draw press die side functioning as a wrinkle holding force adjusting means during draw forming. Therefore, by changing the shape of the drawing bead of the drawing press type to the shape including the shape of the above-mentioned auxiliary bead portion Sb, the above-mentioned auxiliary bead portion Sb is formed at the same time when the panel component W is drawn.

On the other hand, as for the lower scrap cutter 15 of the trimming press type, as shown in FIG. 1, a substantially T-shaped positioning bead portion 17 corresponding to the intersection of the draw bead trace Tb and the auxiliary bead portion Sb is integrally formed. Keep it.

When trimming the panel component W previously formed, as shown in FIGS. 1 and 3, the drawing bead traces Tb and the auxiliary bead portions Sb with respect to the positioning bead portion 17 of each lower scrap cutter 15 are provided. The panel part W is positioned by fitting the intersections of the above, and the upper mold 8 is lowered in this state to perform trimming as in the conventional case.

At this time, in addition to the conventional draw bead mark Tb, the plurality of auxiliary bead portions Sb also play a role of restricting the position of the panel component W, so that even if the draw depth of the panel component W is small, it is possible to reduce the position on the lower mold. The posture of the panel component W is stabilized, and the positioning accuracy is improved.

When the trimming is performed as described above, the non-product region Q is cut and removed from the trim line 1 in FIG. 3, and at the same time, the lower scrap cutter 15 and the corresponding upper scrap cutter 6 work together to make a plurality of short lengths. Will be divided into scrap pieces.

EFFECTS OF THE INVENTION As described above, according to the present invention, a plurality of auxiliary bead portions that are orthogonal to the drawn bead traces are formed in advance in the non-product region of the peripheral edge of the panel component, and during the trim processing, the above-mentioned drawn bead traces and auxiliary beads are formed. The bead and the T formed on the lower scrap cutter
Since the trimming is performed by fitting the positioning bead part in the shape of a letter, the auxiliary bead parts, in addition to the conventional traces of the bead, also serve to regulate the position of the panel part. Even when the drawing depth is small, the posture of the panel component on the lower mold is stabilized, positional deviation is prevented, and the positioning accuracy is improved.

As a result, the shape accuracy of the panel component after trimming is improved, and the speed of the press operation and the speed of the press line can be increased, which contributes to the improvement of productivity.

[Brief description of drawings]

1 is an enlarged perspective view of an essential part of FIG. 2 showing an embodiment of the present invention, and FIG. 2 is a plan explanatory view of a trimming press die similarly showing the embodiment of the present invention, FIG. Is III in Fig. 2
-Cross-sectional view taken along line III, Fig. 4 is an explanatory view of a panel component formed by drawing, Fig. 5 is a cross-sectional view taken along line V-V in Fig. 4, and Fig. 6 is a conventional trimming press type structure. FIG. 7 is an enlarged perspective view of an essential part showing the shapes of upper and lower scrap cutters, and FIG. 8 is an enlarged view of the essential part of FIG. 6. 1 ... Punch as lower mold, 6 ... Upper scrap cutter, 8 ... Upper mold, 15 ... Lower scrap cutter, 17 ... Positioning bead part, M ... Trimming press mold, Q ... Non-product part area , Sb …… Auxiliary bead part, Tb …… Drawer bead mark, W …… Panel parts.

Claims (1)

[Claims] 1. A non-product part region, which is attached as a blank hold part including a draw bead trace, is trimmed by a trimming press die on the peripheral edge of a draw-formed panel component, and is provided on the upper and lower dies of the trimming press die. In the trim processing method in which the non-product area is divided into a plurality of short-sized scrap pieces by the upper and lower scrap cutters, a plurality of auxiliary bead portions orthogonal to the draw bead trace are formed in the non-product area during draw forming. Pre-formed in the area, and at the time of trimming, the panel beads are positioned by fitting the draw bead traces and auxiliary bead parts to the T-shaped positioning bead part protrudingly formed on the upper surface of the lower scrap cutter, and then trimming. A method of trimming a panel component, which comprises: