JPS59229246A - Forming and working method of metallic plate material - Google Patents

Abstract

PURPOSE:To enable considerable economization of a material by producing a material to be formed from a metallic plate having the size smaller than the size of the region to be worked. CONSTITUTION:A titled method consists of a stage for punching a hole part 20 to a metallic plate 191 having a prescribed width, a stage for pressing the end face of the part 20 with a press die and expanding the width thereof as shown by an arrow 23 and a stage for forming and working the region to be worked included in the expanded part 192 and yielding a material to be worked having the width larger than the prescribed width of the metallic plate material 191.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of forming a metal plate, and more particularly, to a method of forming a metal plate in order to use the material of the metal plate more effectively.

[Technical background of the invention and its problems]

For example, there is a mask frame used for color cathode ray tubes as a molded product of metal plate material.

Next, a method for manufacturing a mask frame, which is representative of the conventional standard method for forming metal plate materials, will be explained with reference to the drawing numbers.

First, as shown in Figure 1, 1.2 mmt to 1.6 mmt
Prepare a hoop material (1) consisting of 5 pcc, and then use a press mold to punch out the mask frame material (2) as a molded product as shown in Figure 2. ) are removed as scrap.

Next, as shown in Figure 3, the material for the mask frame (2)
A mask frame member (6) having a bottom part (4) and a side wall part (5) is formed using a press mold.

Next, as shown in Fig. 4, a predetermined rectangular opening (7) is punched out in the bottom part (4) using a press die to complete the mask frame (8) and a hollow material (9). Remove and scrap or reuse in small mask frames.

However, according to the above-mentioned mask frame manufacturing method, a large amount of materials such as punching scraps (3) and hollow materials (9) are wasted, especially in mask frames used for large 21V type and 25V color picture tubes. In this case, a large amount of hollow material (9) will be produced as scrap.

In this case, from the standpoint of resource conservation, it is possible to manufacture a mask frame for use in a small 13V color picture tube using the hollow material (9) for 21V and 25-inch shapes, but for the smaller 19V In order to use the hollow material for the 13V shape mask frame, as shown in Figure 5, 1.
While the hollow material (91) for the 9V type is almost rectangular, with one opposite side measuring 345 mm and the other opposite side 247 mm, the material required for the mask frame for the 13V type (10)
As shown in FIG. 6, one opposite side is 317 mm and the other opposite side is ;l'70m+n. Therefore, as it is, the dimensions of one opposite side are sufficient, but the dimensions of the other opposite side are insufficient, so that conventionally there is no choice but to dispose of it as scrap (1), resulting in a large amount of wasted material.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a method for forming a metal plate material into a molded object from a metal plate material having a size and width smaller than the surface of the region to be processed.

[Summary of the invention]

The present invention comprises a process of drilling a hole in a metal plate material having a predetermined width, a process of suppressing and widening the metal plate material provided with the hole in a predetermined width direction, and a workpiece included in the widened part. A method for forming a metal plate material, characterized in that a region surface is formed to obtain a formed object having a dimension width larger than a predetermined width of the metal plate material, the metal plate material is in a band shape, and the shape is formed in the longitudinal direction. drilling a hole having a predetermined length along the
Further, in an embodiment, the metal plate material is in the form of a band, and the width of the metal plate material in the vicinity of the hole drilled in the direction intersecting the longitudinal direction is widened to obtain a wide processed area surface.

[Embodiments of the invention]

Next, as an example of the method of forming a metal plate material of the present invention, a method of forming a mask frame used for a color cathode ray tube will be explained step by step with reference to FIGS. 7 to 12, and a press mold used will be explained below. This will be explained with reference to FIGS. 13 and 14.

First, as shown in Fig. 7, a metal plate material for a mask frame is made of 1,2n+mt of 5pcc material with 3451 mark on one opposite side and 247+n+++ on the other side as shown in Fig. 5.
Hollowed material for 19V mask frame consisting of (IL+
).

Next, as shown in FIG. 8, a rectangular hole (20) with one side opposite the center of the hollow material (19z) of 230 mm and the other opposite side of 14 mm is bored, and this hollow material (21)
shall be treated as scrap.

Next, by pressing the end face of the hole (20) corresponding to one opposite side outward in the direction of the arrow (23) using a press die (to be described later), the hole (20) is formed as shown in FIG. Expand one opposite side to 220mm and the other side to 170mm,
The outer diameter dimensions are 340 mm on one opposite side and 2 on the other opposite side.
The width is expanded to a portion (192) containing the raw material on the surface of the processed area of 77 mm.

Next, as shown in Figure 10, the outer shape is the shape of the material for molding a 13V mask frame, and one opposite side is
7mm, and remove the periphery with a press mold so that the other opposite side is 270mm, and use the mask frame material (231)
is obtained.

Next, as shown in Figure 11, this mask frame material (
23+) using a press mold to form the bottom part (24).
, a mask frame member (23) having a side wall portion (25)
After forming, as shown in FIG. 12, a frame-like shape including holes (20) is punched out to complete a 13V mask frame (28) having a predetermined opening (26). shall be scrapped.

The steps shown in FIGS. 7 to 12 are manufactured using a press mold.

In addition, the hole (20) to be expanded from the step in FIG. 8 to the step in FIG. A locking portion (35 +
) with the opposite ends of the holes (20) of the hollow material (191) locked, and as the punch (31) descends, the hollow material (37) is held down via an elastic material (36) such as porous urethane. ) to press the hollow material (191) and then expand it in the direction of the arrow (34). This hollow material presser (37) must press the hollow material (191) to an extent that can prevent wrinkles in the hollow material (19□) that occur when the hole (20) expands. If the suppression by the hollow material presser (37) is weak or absent, wrinkles will occur, making it unsuitable for manufacturing a mask frame.

Generally, the thickness tolerance for plates with a thickness of about 1.2 mm is ±0.
．． The diameter of the hollow material (IL) is approximately 0.8 mm, and if the thickness direction margin between the hollow material presser (37) and the hollow material (IL) at the bottom dead center is eliminated, the surface of the hollow material (1!l]+) If you cause scratches or press too much, the expanded size will become smaller.
In the opposite case, the expanded dimension becomes larger and the hollow material (1
91), which causes inconvenience in manufacturing the mask frame.

Next, main parts of a modification of the present invention will be explained with reference to FIGS. 15 and 16.

First, the one shown in FIG. 15 uses a band-shaped metal plate material (40), and the width of this metal plate material (40) is made narrower than the material of the final formed body. This metal plate material (4
0), holes (41) having long sides of predetermined dimensions are bored at predetermined intervals along the longitudinal direction, and in the next step, the long sides of these holes (41) are With the press die shown in FIG. 14, a material (43) for a molded body is obtained which is expanded in the direction of the arrow (42) and has a wide processed area surface.

The one in Fig. 16 is similar to the one in Fig. 15, but the strip-shaped metal plate (50) has a hole (51) having a long side of a predetermined length in a direction intersecting the longitudinal direction. is perforated, and in the next step, the short side is expanded in the direction of the red stamp (52) using a press mold shown in FIGS. 13 and 14 to obtain a material (53) for a molded product.

〔Effect of the invention〕

As described above, according to the metal sheet forming method of the present invention, it is possible to easily and inexpensively manufacture a molded object having a size and width larger than the width of the metal sheet, and it is possible to significantly save the material of the formed object.

[Brief explanation of drawings]

Figures 1, 2, 3, and 4 are perspective views showing the manufacturing method of a mask frame, which is representative of the conventional molding method for metal plate materials, in order of process, and Figure 5 is a 19V-type color picture tube. FIG. 6 is a perspective view showing the hollow material used in manufacturing the mask frame; FIG. 9, 10, 11, and 12 are perspective views showing the manufacturing method of a mask frame as a typical example of the metal plate forming method of the present invention in order of steps, and FIG. 13 and 1
Figure 4 is a diagram showing a press die used for expanding the hole, Figure 13 is a partially cutaway side view showing the state before expanding, and Figure 14 is a partially cutaway side view showing the state during expanding. The cutaway side view, FIG. 15, and FIG. 16 are explanatory diagrams of a method of forming a material for a molded product when different holes are provided in a band-shaped metal plate material. 1... Hoop material 2, 10, 23, 43
．． 53...Material of molded product 4.24...Bottom part
5, 25... Side wall portion 6. 23... Mask frame member 8, 28... Mask frame 9.
9s, 21... hollow material 20, 41.51
... Hole 31 ... Punch 32 ...
Tapered part 34...expanding jig 40,50
...Representative for band-shaped metal sheets Patent attorney Inoue-male Figure 1 Figure 3 Figure 5 Figure 2 Figure 4

Claims (3)

[Claims] (1) A step of drilling a hole in a metal plate material having a predetermined width;
A step of suppressing and widening the metal plate material provided with the hole in the predetermined width direction, and forming a surface of the processed area included in the widened portion to create a dimension width larger than the predetermined width of the metal plate material. 1. A method for forming a metal plate material, characterized in that a molded object is obtained. (2) The method of forming a metal plate according to claim 1, wherein the metal plate is in the form of a band, and a hole having a predetermined bow length is bored along the longitudinal direction. (3) The metal plate material is strip-shaped, and the metal plate material is widened in the vicinity of the hole drilled in the direction intersecting the longitudinal direction to obtain a wide processed area surface. A method of forming a metal plate according to claim 1.