JPH04162922A - Method for drawing peripheral edge part of punched plate - Google Patents

Abstract

PURPOSE:To improve the formability and the yield of material by drawing the edge of hole while pressing the peripheral edge of the punched hole. CONSTITUTION:Because the peripheral edge of the hole 3 is pressed with the pad 23 before forming the peripheral edge part 4 of the inner panel, then the peripheral edge part 4 is pressed by inserting it with the upper die 20 and the lower die 12 and the drawing of the peripheral edge part 4 is executed, so the state of shortage of shape freezing is not generated, and the cracks and wrinkles of the hole can be prevented. And the hole 3 is made large also on the drawing time of the peripheral edge part 4, and the state as if the material is supplied from the inner side is made, so the drawing forming of the peripheral edge part of the inner panel 2 can be executed stably. Therefore, because the outer dimension of the plate before forming can be set small, so the improvement of the drawing moldabibilty of the peripheral edge of window part and the improvement of the yield of material can be realized.

Description

[Detailed description of the invention] 〈Industrial use distribution〉 The present invention relates to a method for cutting the peripheral edge of a perforated plate material.

<Prior art> As shown in Fig. 6, the tailgate panel of an automobile (
For example, the inner panel) 2; hole 3 for the window is drilled,
The peripheral portion 4 is formed into a predetermined shape by drawing.

In the process of drawing the inner panel 2 of the tailgate, the material with the hole 3 drilled therein is placed on the lower mold, the periphery of the material is supported by the lower mold with a blank holder, and the material is pressed and supported by the upper mold. The periphery of the hole 3 and the periphery 4 of the inner panel 2 are pressed between a lower die and the periphery 4 is drawn.

<Problems to be Solved by the Invention> In recent years, tailgate windows have become larger, and the size 63 of the inner panel 2 has also become larger. As a result, the shape of the hole 3 is insufficiently connected, and the deformation of the hole 3 increases during machining of the peripheral edge s4 of the inner panel 2, making it easy to crack and wrinkle. It is necessary to provide a margin so that the material deforms from the periphery toward the inside, and when finishing the product, the amount of cutting at the periphery increases, resulting in poor yield.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for drawing the peripheral edge of a perforated plate material, which has good formability and can improve material yield.

Means and Effects for Solving the Problems> In order to achieve the above object, the drawing method of the peripheral edge of a plate with holes of the present invention involves squeezing the peripheral edge of a plate with holes and then drawing the peripheral edge of the same size. The presser is characterized in that the peripheral edge of the plate material is drawn and formed while holding down the periphery of the large size, and during drawing and forming, the plate material moves from the peripheral edge side of the hole to the peripheral edge, and when drawing and forming, the plate material moves from the peripheral edge side of the hole to the peripheral edge of the plate material. No impact will occur.

Embodiments FIG. 1 shows a cross-sectional side view of a drawing machine for carrying out a method according to an embodiment of the present invention, and the state shown in FIG. 1 shows the state when forming is completed.

In the figure, reference numeral 11 denotes a lower die punch on which the inner panel 2 as a plate material is placed, and a lower die 12 for drawing the peripheral edge portion 4 is formed on the upper surface of the lower die punch 11. A lower die blank holder 14 is supported around the lower die punch 11 in an upwardly biased state via a bushing bin 13, and a lower die blank holder 14 is supported on the upper surface of the lower die blank holder 14 to support the peripheral edge of the inner panel 2. A mold portion 15 is formed. Above the lower mold blank holder 14 is an upper mold blank holder 1.
6 is disposed on the lower surface of the upper mold blank holder 16, and the upper mold part 1 which pinches the peripheral edge of the inner panel 2 with the lower mold part 15 is disposed on the lower surface of the upper mold blank holder 16.
7 is formed. The upper die blank holder 16 is attached to an outer adapter 18 of a press machine and is configured to be driven up and down.

An upper die punch 19 is disposed above the lower die punch 11, and the lower die 12 is disposed on the lower surface of the upper die punch 19 facing the lower die 12.
An upper mold 20 is formed between which the peripheral edge 4 of the inner panel 2 is pressed and drawn. The upper die punch 19 is attached to the inner adapter 21 of the press machine and is driven up and down.

A pad 23 is supported by the upper die punch 19 via a gas spring 22 so as to be vertically movable, and the pad 23 presses the periphery of the hole 3 of the inner panel 2 between it and the lower die punch 11. When the upper die punch 19 rises, the pad 231 is located above the upper die 20, and when the upper die punch 19 descends, the pad 23 contacts the inner panel 2 before the upper die 20 contacts the inner panel 2. In addition, the reference numeral 24 in the figure is a pad retainer◇Next, a method according to an embodiment of the present invention using the drawing device having the above structure will be explained based on FIGS. 1 to 4. FIG. 2 shows a state in which the lower mold part 17 is in contact with the periphery of the inner panel 2;
Figure 3 shows a state in which the peripheral edge of the inner panel 20 is pressed, and
The figure shows a state in which the periphery of the hole 3 is pressed down.

As shown in FIG. 2, the inner panel 2 is placed on the lower die punch 11, and the upper die blank holder 16 is lowered by driving the outer adapter 1B to bring the lower die part 17 into contact with the periphery of the inner panel 2. The width of the hole 3 at this time is t. As shown in FIG.
When the upper mold blank holder 16 is further lowered by the movement and the periphery of the inner panel 2 is pinched between the upper mold part 17 and the lower mold part 15, the hole 3 expands to the width T (9) (material is supplied from the hole 3 side). (state) The peripheral edge is formed, and the peripheral edge forming is completed at the lowered end of the upper die blank holder 16.

Next, as shown in FIG. 4, the inner adapter 21 is driven to lower the upper die punch 19, and the pad 23 presses the periphery of the hole 3 of the inner panel 2 against the lower die punch 11. At this time, the upper die 20 is not in contact with the peripheral edge 4 of the inner panel 2. When the inner panel adapter 21 is further driven, the upper die punch 19 further descends against the pad 23 against the biasing force of the gas spring 22, and as shown in FIG. The circumferential part 4 of No. 2 is pressed between the upper die 20 and the lower 1i112, and the circumferential edge is drawn, and the drawing of the circumferential edge is completed at the lower end of the upper die punch 19.

Therefore, according to the above-described drawing method, when forming the periphery of the inner panel 2, the periphery of the hole 3 is not pressed by the pad 23, so it is in a free state and can easily move outward. Moreover, before forming the peripheral edge part 4 of the inner panel 2, the peripheral edge of the hole 3 is pressed by the pad 23, and then the peripheral edge part 4 is pressed between the upper mold 20 and the lower mold 12 to form the peripheral edge part 4.
Since the drawing process is performed, there is no possibility of insufficient shape connection, and cracks and wrinkles in the hole 3 are prevented.
Moreover, even when the peripheral edge portion 4 is drawn, the 63 expands and material is supplied from the inside, so that the drawing process does not affect the peripheral edge of the inner panel 2.

In the above embodiment, an example was shown in which the method of the present invention was applied to the drawing process of the inner panel 2, but as shown in FIG. It is also possible to apply this method to the drawing process of the outer panel 31 with a deep drawing depth. Outer panel 31
Since there is a sudden shape change from the hole 32 to the peripheral edge 33, by pressing the peripheral edge of the hole 32 with the pad 23 between forming the peripheral edge and drawing the peripheral edge 33,
The angle between the periphery of the hole 32 and the periphery of the outer panel 31 can be kept small, the movement of the periphery of the hole 32 becomes smooth, and drawing can be easily and precisely performed.

<Effects of the Invention> The method of drawing the periphery of a perforated plate material of the present invention involves squeezing the periphery of the plate material, then pressing the periphery of the hole, and drawing the periphery of the plate material while holding the periphery of the hole. As a result, even if the hole is large, a state of insufficient shape connection does not occur, and the plate material moves from the periphery side of the hole to the periphery when forming the periphery. As a result, the peripheral edge of the plate material will not be affected by the pattern or processing, and the amount of cutting of the peripheral edge will be reduced when making the product.
, it is possible to improve moldability and material yield.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view of a drawing device that implements the method according to one embodiment of the present invention, Figs. 2 to 4 are explanatory diagrams of its operation, and Fig. 5 is when the method of the present invention is applied to processing an outer panel. FIG. 6 is a cross-sectional side view of the drawing device used in the present invention, and FIG. 6 is a perspective view of the tailgate. In the drawings, 2 is an inner panel, 3 is a hole, 4 is a peripheral edge, 11 is a lower mold bunch, 12 is a lower mold, 19 is an upper mold bunch, 20 is an upper mold, and 23 is a pad.

Claims (1)

[Claims] Drawing of the periphery of a perforated plate material, characterized in that the periphery of the plate material with holes is squeezed, the periphery of the hole is pressed, and the periphery of the plate material is drawn while the periphery of the hole is pressed. Processing method.