JPH035247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method of manufacturing various panels having openings, such as vehicle door panels and rear fenders.

(Prior Art) Conventionally, as a panel having an opening, for example, a side window 1 having an opening as shown in FIG.
In order to manufacture the rear fender 2 having
As shown in the figure, in step 201, a frame portion 2a that will become the glass attachment portion is preliminary formed by drawing toward the inside of the vehicle body, and in step 202, the outer peripheral portion 2e is trimmed and the inside of the frame portion 2a is roughly punched out. (shown by imaginary lines in the figure), the remaining portion inside the frame 2a is punched out in step 203, and finally, in step 204, punching is performed to finish the cross-sectional shape of the frame 2a. Restrike (finish molding) was applied.

In other words, in the rear fender 2 described above, the width of the center pillar portion 2b is relatively small, for example.
Furthermore, since the cross-sectional shape of the frame portion 2a changes greatly, for reasons such as the strength of the trim mold, only a rough portion of the inside of the frame portion 2a is removed at the same time as trimming. In order to prevent cracks or the like from occurring in the frame portion 2a, the remaining portion of the frame portion 2a has to be punched out first.

Moreover, FIGS. 6 and 7 are diagrams showing an example of a press die used for restriking.

In FIG. 6, reference numeral 3 indicates a lower holder on which a punch 4 is fixed, reference numeral 5 indicates an upper holder provided with a restriking die 6 facing the punch 4, and reference numeral 7 indicates the above-mentioned restriking die 6. The pad 7 is held by an elastic body and a pad retainer (not shown) provided between the pad 7 and the upper holder 5.

The restriking of the rear fender 2 in the above-mentioned press die is carried out by inserting the curved corner portion C of the frame portion 2a formed by the drawing process in the previous process into the punch 4 and the restriking die 6, as shown in FIG. Make a nearly right angle between them.

(Problems to be Solved by the Invention) However, in the conventional method of manufacturing a panel having an opening, the step 20 of punching out the inside of the frame 2a prior to restriking is necessary.
2,203, the grip part of the iron band that handles the panel (rear fender 2) and the rigidity of the panel itself were lost early in the process.
There was a problem in that the panels had to be handled carefully without bending or damaging them during transportation, and there were restrictions on the parts that could be gripped. Furthermore, when restriking, the frame portion 2a is pulled in the direction of the corner portion C, as shown by the arrow in FIG. Ta.

The present invention was made by focusing on the above-mentioned problems, and provides a method for manufacturing panels with openings that is suitable for handling between processes and allows for obtaining high-precision products. is intended to provide.

[Structure of the Invention] (Means for Solving the Problems) The method for manufacturing a panel having an opening according to the present invention will be explained based on FIG. 1. First, in step 101, the opening formed by drawing is A volume is formed near the inner periphery of the frame, preferably along the frame at the same time as the drawing process, and step 10
In step 2, the frame is restriked while crushing the volume, and then in step 103, the inside of the frame is punched out to form an opening. Trimming and the like are performed before, during, or at the same time as restriking. Further, the volume is formed at the same time as or after the drawing process, and the amount of extra thickness is set in consideration of the amount that will be drawn during restriking.

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

FIG. 2 is a diagram illustrating an embodiment of the present invention, and shows a state in which restrike is performed using the press mold described in the conventional example (see FIG. 5).

That is, the reference numeral 2 in FIG. 2 is a rear fender having a side window as a panel having an opening, 4 is a punch, 6 is a die for restriking, and 7 is a rear fender that punches the main body 2c of the rear fender 2. It is a pad that is pressed and fixed between.

In the rear fender 2, a frame portion 2a for attaching side window glass (not shown) is preliminarily drawn toward the inside of the vehicle body (lower side in FIG. 2), and the frame portion 2a is drawn inward toward the inside of the vehicle body (lower side in FIG. A volume V is formed in a scrap part 2d which has a curved corner part C at the border and is later punched out as the inside of the frame part 2a. The frame portion 2a after punching out the scrap portion 2d has a flange shape that is set back one step toward the inside of the vehicle body from the main body portion 2c and extends toward the inside of the window.

The volume V is attached to the frame portion 2 so as to be located between the contact surfaces of the punch 4 and the restriking die 6.
It is provided in the vicinity of the frame portion 2a, and is formed into a convex shape by a bead provided on the lower die of the drawing die forming the frame portion 2a. Further, the volume V has a thickness that is pulled toward the corner C when the curved corner C is shaped into a substantially right-angled shape, and the volume V has a wall thickness that is pulled toward the corner C when the curved corner C is shaped into a substantially right-angled shape. It is formed into a shape.

And the rear fender 2 after the above drawing process
When restriking is performed, the volume V is crushed between the punch 4 and the restriking die 6, and the curved corner portion C is finished formed into a substantially right-angled shape. Therefore, an amount of meat corresponding to the volume V is supplied to the curved corner portion C, and it is possible to prevent cracks or the like from occurring in the frame portion 2a. Note that by providing upper and lower cutting blades on the press die, it is possible to trim the outer circumferential portion 2e of the rear fender 2 at the same time as restriking the frame portion 2a.

Furthermore, rear fender 2 after restrike
As shown in FIG. 3, the scrap part 2d, which is the inner side of the frame part 2a, is punched out to form an opening, resulting in a product.

In other words, as described above, if the scrap part 2d is punched out last, each pre-process can be carried out while maintaining the rigidity of the panel itself, which is suitable for handling.
The inside dimensional accuracy of a is good, and the inside of the frame 2a can be punched out in one go.
There are many advantages such as reduction in the number of steps and reuse of the scrap portion 2d.

Note that the type of panel and the shape of the volume V are not limited to the above embodiments.

[Effects of the Invention] As described above, according to the method of manufacturing a panel having an opening of the present invention, a portion of the opening frame formed by drawing is formed near the inner circumference of the opening along the frame. The method was to form a volume by bending and bending, restriking the frame while crushing the volume, and then punching out the inside of the frame to form an opening, so the inside of the frame was punched out in the middle of the process. Compared to the conventional method in which the panel itself maintains its rigidity until the final step, it is very advantageous in terms of handling between each step.Moreover, the formation of the volume and the above-mentioned steps work together. This has the effect that a product of good quality can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram illustrating the configuration of the present invention, Fig. 2 is a sectional view illustrating the main parts of a press mold used for restriking in an embodiment of the invention, and Fig. 3 shows the opening after molding. FIG. 4 is a front view illustrating a rear fender as an example of a panel having an opening, and FIG. 5 is a conventional method for manufacturing a panel having an opening. FIG. 6 is a cross-sectional view illustrating a press die used for restriking as a conventional example, and FIG. 7 is a diagram illustrating the state of the press die shown in FIG. FIG. V... Volume, 2... Rear fender (panel), 2a... Frame.

Claims (1)

[Claims] 1. When manufacturing a panel having an opening, a volume bent along the frame is provided near the inner periphery of the opening frame formed by drawing, and while the volume is crushed, the frame is 1. A method for manufacturing a panel having an opening, the method comprising: restriking, and then punching out the inside of the frame to form an opening.