JPS5832525A - Lower die structure for bending - Google Patents

Abstract

PURPOSE:To facilitate the peeling of a protective film from a thin plate after work, by forming a recessed and a peak part in a wall of a V-shaped groove formed in a lower die, and aranging a thin metallic plate coated with the protective film and then setting an upper die. CONSTITUTION:In one wall 2A at the deep part of a V-shaped groove 2 formed in the top surface of a lower die 1, a recessed part 3 is formed closely to the deepest part, and a peak part 4 is also formed between the recessed part 3 and groove 2. An upper die 5 is aranged on the lower die 1 and a thin metallic plate 7 covered with vinyl, etc., is mounted with the protective film 6 down. When the lower die 1 is elevated to allow the thin metallic plate 7 to about on the upper die 5, the thin metallic plate 7 changes from elastic deformation to plastic deformation and thus vertical bending is completed. Further, when the plate 7 has the bottom bent at the deepest part 2 of the groove 2, the plate 7 at the side of the recessed part 3 flexes into the recessed part 3 and the protective film 6 is cut with the peak part 4. This structure eliminates flaws, etc., of the surface of the product.

Description

DETAILED DESCRIPTION OF THE INVENTION In accordance with the present invention, the surface is sealed on the lower mold to form a V-shaped groove on the butt surface. A thin metal plate made of stainless steel or the like coated with is placed on the lid with its protective film facing downward, and a KV-shaped upper mold is placed above the groove, and both molds are used to press the thin metal plate in the V-shaped groove. In particular, when bending a thin metal sheet, the protective film is cut along the bent part of the coated metal thin sheet at the same time as the bending process, and the protective film can be easily peeled off before welding the thin metal sheets together. With the goal.

Conventionally, after processing the vinyl YVP membrane stainless steel bend, when welding the stainless steel to each other, 1ll
I am currently working on peeling off the vinyl from the contact area. This step involves cutting the protective vinyl film with a knife and then peeling off the vinyl, so it's work 1! There were times when the steel was cut to areas other than necessary, causing large scratches on the stainless steel and causing a decline in quality.

In view of this point, the present invention achieves the intended purpose by providing a lower mold that can cut a protective film at the same time as bending a thin metal plate.

Below is a simple example of the present invention based on a curved surface. explain. Figure 1 shows the front view of the overall structure of the lower mold (1) of the present invention;
Figure 2 shows an enlarged view of Figure 1, with 29 and the lower mold (1
) of J:l1lI is horizontal, and this horizontal plane (1A) has ■
A mold groove (2) is formed, and the end corners of Da (21) are curved surfaces (I
B) Ic type 6-(ru.
A) K has a relief part (3) close to the deepest part (2B) of the groove (2), and has a pointed tip 1!l5 (4) between the relief 1ll (3) and # (21). Form.

In one IIL3A)H figure 2 of relief part (3),
As shown by the dotted line, one of @C2)! ! It intersects the fly length of (2A) at the curved surface (1B).

If the structure is as described above, the lower mold (1) is placed above the lower mold (1).
1) by raising the v-shaped upper mold (
6) is fixedly placed. Therefore, the horizontal surface of the lower mold (1) (
1 person) Vinyl-w Ql (Z) protective film (6) on top
1. Apply a protective film (7) to the covered thin metal plate (7) such as stainless steel
6) After Uko faces down and lays his eyes, down! & type (1)
When the metal thin plate (7) comes into contact with the upper mold (5), the metal thin plate (7) begins to slide on the curved surface (1B), and the metal thin plate (7) gradually changes from elastic deformation to dusty deformation. Then, as shown in the third factor, the final shape, that is, in the Rokumaro example, the angle of the groove (2) is 900, so that the metal sheet (7) is bent at a right angle.

When the thin metal plate (7) completes bottoming at the deepest part (2B) of the groove (2), downward stress is applied to the thin metal plate (7), and the thin metal plate located at the relief II (3) II (7
) is bent into the relief part (3) as shown by the dotted line, and at this time the guard all (6) is cut by the 7j2 head (4). The depth of the cut can be achieved by adjusting the force applied to the mold (5) depending on the thickness of the protective film (6).

Metal 4 & (71
When welding other thin metal plates, the protective film (6) on the bath v part side can be easily peeled off as shown in FIG.

As described above, the present invention is directed to the V-shaped groove O- formed on the side surface of the lower mold.
10,4iK is defined by forming a relief part close to the fi deep part of the groove, and forming a pointed head at the relief part and the groove bend,
This method is used to protect a thin stainless steel metal plate whose surface has been covered with a protective AI film such as vinyl y before bathing, since it can be bent and the protective film can be applied along the bend at the same time. The work of peeling off the film becomes easier, and the work efficiency can be significantly improved. 6 It also prevents the removal of parts other than the necessary parts and the damage to the parts that will be exposed on the product surface, which improves reliability. Excellent and can also improve quality.

[Brief explanation of the drawing]

Figure 1 is a front view of the lower mold of the present invention, and Figure 2 [F] is the first
The enlarged view of part A in the figure, the sixth factor is an explanatory view of the processing operation of the present invention, and FIG. 4 is a perspective view of the thin metal plate with a part of the protective film removed. (1)...Lower mold, bottom)...V-shaped groove,
(2A)... -1 wall of groove, (2B) -...
... Deepest part of the groove, (1) ... Relief part, (4)
−・・・Pointed head, (5)・・・・・・and mold, (6)
・・・・・・Protection 1i11 (viny-tv), (7
)・・・・・・Thin metal plate (stainless steel, steel).

Claims (1)

[Claims] 1. Place a vinyl surface on the lower mold to form a V-shaped groove on the upper surface.
A thin metal plate such as stainless steel coated with a protective film of 1 cm thick is placed with the protective film facing downward, and the upper part of the groove is KVW.
The upper mold is made to correspond to each other, and the thin metal plate is bent in the front wF3v type groove using both molds, wherein the V
A bottom metal for bending characterized in that a relief part is formed on the -1 wall of the mold groove in proximity to the deepest part of the groove, and a pointed head is formed between the relief part and the groove. Type structure.