JPH0256163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a thin metal plate made of stainless steel or the like whose surface is covered with a protective film such as vinyl is placed with the protective film facing downward on the lower mold which forms a V-shaped groove on the upper surface. and a V-shaped upper mold is made to correspond above the groove,
Regarding the method in which the thin metal plate is bent in the V-shaped groove using both of the molds, a protective film is cut along the bending part of the thin metal plate at the same time as the bending of the thin metal plate, and the thin metal plates are bonded to each other. The purpose is to make it easier to remove the protective film before welding.

Conventionally, after bending the vinyl coated stainless steel, when welding the stainless steel to each other, the vinyl at the welded portion is peeled off. This process involves cutting the protective vinyl film with a knife and then peeling it off, which significantly reduces work efficiency, and sometimes cutting to areas other than the required areas may result in large scratches on the stainless steel, resulting in a decline in quality. It was hot.

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

An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a front view showing the overall structure of the lower mold 1 of the present invention, and FIG. 2 is an enlarged view of the inside of the circle in FIG. forms a V-shaped groove 2, and the upper corner of the groove 2 has a curved surface 1.
Form into B. A relief portion 3 is formed on one wall 2A of the V-shaped groove 2 in proximity to the deepest portion 2B of the groove 2, and a pointed portion 4 is formed between the relief portion 3 and the groove 2. One wall 3A of the relief portion 3 intersects the extension of one wall 2A of the groove 2 at the curved surface 1B, as shown by the dotted line in FIG.

A V-shaped upper mold 5 is fixedly arranged above the lower mold 1 constructed as described above, which fits into the groove 2 as the lower mold 1 rises. Therefore, the horizontal surface 1 of the lower mold 1
A thin metal plate 7 made of stainless steel or the like whose surface is covered with a protective film 6 made of vinyl or the like is placed on A with the protective film 6 facing downward. After that, when the lower mold 1 is raised and the thin metal plate 7 comes into contact with the upper mold 5, the thin metal plate 7 begins to slide on the curved surface 1B, and the thin metal plate 7 gradually changes from elastic deformation to plastic deformation, as shown in FIG. As shown in the figure, the final shape, that is, in the example, the angle of the groove 2 is 90°, so that the metal thin plate 7 is bent at a right angle. When the thin metal plate 7 completes bottoming out at the deepest part 2B of the groove 2, downward stress is applied to the thin metal plate 7, and the thin metal plate 7 located on the side of the relief part 3 moves into the relief part 3 as shown by the dotted line. At this time, the protective film 6 is cut by the pointed head 4. Note that the depth of the cut can be achieved by adjusting the pressure applied to the upper mold 5 according to the thickness of the protective film 6.

Metal thin plate 7 that has been bent as described above
When welding other thin metal plates, the protective film 6 on the welded part side can be easily peeled off as shown in FIG.

The present invention is directed to the V formed on the upper surface of the lower mold as described above.
A relief part is formed on one wall of the mold groove near the deepest part of the groove, and a pointed head is formed between the relief part and the groove, so the surface is covered with a protective film such as vinyl. Since the protective film can be cut along the bent part at the same time as bending a thin metal plate such as stainless steel, the protective film can be easily removed before welding, significantly improving work efficiency. Can be done. In addition, there is no need to cut out unnecessary parts or damage parts that will appear on the surface of the product, resulting in excellent reliability and improved quality.

[Brief explanation of the drawing]

Fig. 1 is a front view of the lower mold of the present invention, Fig. 2 is an enlarged view of part A in Fig. 1, Fig. 3 is an explanatory diagram of the processing operation of the present invention, and Fig. 4 is a part of the protective film removed. FIG. 1... Lower mold, 2... V-shaped groove, 2A... One wall of the groove, 2B... Deepest part of the groove, 3... Relief part, 4
... Pointed head, 5 ... Upper mold, 6 ... Protective film (vinyl), 7 ... Thin metal plate (stainless steel).

Claims (1)

[Claims] 1 Consists of a lower mold having a V-shaped groove and a horizontal surface on which a thin metal plate coated with a protective film such as vinyl is placed on the upper surface, and a V-shaped upper mold. In a bending mold for bending a V-shaped groove into a V-shape, a relief part is formed on one wall of the V-shaped groove of the lower mold adjacent to the deepest part of the groove, and the relief part and the groove part A bending mold characterized in that a pointed head for cutting the protective film is formed in between.