JPS61229423A - Production of cylindrical body composed of metallic plate - Google Patents

Abstract

PURPOSE:To simplify the process by arranging the metal made roller providing cylindrical part on the center part and the roller having the cylindrical part of rubber like elastic body on the center part and by forming the step part as well which is adapted for both end parts of a product on the end part of each roller. CONSTITUTION:Rollers 9, 10 are arranged between frames 8, 8 and driven via gear wheels 11, 12, 13 by motor 14. The metal made roller 9 provides cylindrical part 15 on the center part and step part 16 and small diameter part 17 are formed on both end parts thereof. The step part 16 and small diameter part 17 are formed in the shape fitted to the step part and short cylindrical part of the product. The roller 10 has the cylindrical part 18 consisting of a rubber elastic body on its center part and the step part 20 which is adapted for the outside shape of the step part of the product is provided on its both ends. With pinching through punching metallic plate material 22 by driving a motor 14 the product is obtd. The production process can be simplified by this method.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a cylindrical body obtained by bending a metal plate into a circular shape.

This type of cylindrical body is widely used as bodies of various cans, magic bottles, electric water heaters, and the like.

4 and 5 show an example of a cylindrical body as a product manufactured according to the present invention, which is used as the body of an electric water heater. This cylindrical body 1
has a cylindrical body 2, and at both upper and lower ends of the body 2 there are stepped portions 3 for fitting into the shoulder rest and bottom body of the electric water heater.
a, 3b are formed, and furthermore, a short cylindrical part 4a is formed at the tip thereof.
, 4b are erected. Further, a cutout 5 for attaching a panel is formed on the front surface, and a flange 6 is bent inward at the edge of the cutout 5. Furthermore, a notch 7 for attaching a plug receiver is formed in a part of the lower part.

BACKGROUND OF THE INVENTION Conventionally, the following steps were used to manufacture the cylindrical body 1 described above.

That is, first, from a metal sheet material, a sheet material of a predetermined shape is processed. Next, the plate material is bent into a cylindrical shape using three metal rollers, and both ends of the plate are joined to form a cylinder. Next, the diameter of one end of the cylinder is narrowed down to form a stepped portion 3a.
is formed, and the tip of the stepped portion 3a is raised in the length direction to form a short cylindrical portion 4a. Furthermore, a stepped portion 3b and a short cylindrical portion 4b are also formed at the other end of the cylinder. Thereafter, the joined portions of both end edges of the plate material are separated, and the end edges are bent inward to form seven flange portions 6, thereby obtaining the cylindrical body 1.

Problems to be Solved by the Invention However, the above-mentioned method requires many and complicated processing steps, and requires a large number of large press machines.
It also required a lot of manpower. In the case of the cylindrical body 1 with the cutout 5 open as described above, both ends of the plate are once joined and then separated to produce the final product, resulting in wasted material.

The present invention has been developed in view of the above circumstances, and involves bending a plate material and forming step portions 3a, 3b and short cylindrical portions 4a, 4b in a single process from a plate material punched into a predetermined shape. It is an object of the present invention to provide a method by which a final cylindrical body 1 can be obtained immediately by simply forming flange portions 6 at both ends.

As a means for solving the problem, the manufacturing method of the present invention includes a metal roller having stepped portions at both ends that match the inner shape of both ends of the product and a cylindrical portion in the center; and a roller having a metal step that matches the outer shape of both ends of the product and a cylindrical part made of a rubber-like elastic body in the center, with the cylindrical parts of both rollers in pressure contact with each other. The feature is that the metal plate material is pressed between the two rollers while being rotated.

1 and 2 show an apparatus for carrying out the method of the invention.

In this device, two rollers 9, 10 are suspended between a frame 8, 8 and are driven by a motor 14 via gear wheels 11, 12, 13.

The upper roller 9 is rigid and made entirely of metal, and has a cylindrical portion 15 formed in its center, and a stepped portion 16 and a small diameter portion 17 at both ends of the cylindrical portion 15. This conforms to the inner shape of the step portions 3a, 3b and the short tube portions 4a, 4b at both ends of the cylindrical body 1.

Further, the lower roller 10 has a cylindrical portion 18 made of a rubber-like elastic body formed in the center thereof. The material of the cylindrical portion 18 is suitably urethane or natural or synthetic rubber;
The appropriate hardness is about 60 to 90 degrees in JIS hardness. One large diameter part made of metal is formed at both ends of the cylindrical part 18, and between the cylindrical part 18 and one large diameter part, there are stepped parts 3a, 3b and 3b at both ends of the cylindrical body 1. A stepped portion 20 is formed to match the outer shape of the short cylindrical portions 4a and 4b.

The rollers 9 and 10 have a gap between the stepped portion 16, the small diameter portion 17, the stepped portion 20, and one large diameter portion, which should be equal to the thickness of the plate material 22 from which the cylindrical body 1 is to be manufactured. The cylindrical portion 15 of the roller 9 is pressed against the cylindrical portion 18 of the roller 10. The pressure contact force can be adjusted by an adjustment screw 21 provided on the upper part of the frame 8.

Then, by driving the motor 14, both rollers 9.10
1 and 2 by rotating the metal plate 22 and compressing it through the metal plate 22 which has been previously shaped into a predetermined shape.
The cylindrical body 1 shown in the figure is manufactured.

According to the present invention, both ends of the plate material 22 are pinched between the stepped portion 16 and the small diameter portion 17 of the roller 9 and the stepped portion 20 and the large diameter portion 19 of the roller 10, as shown in FIG. Then, it is bent into a shape that matches the cross-sectional shape of the cylindrical body 1.

Further, since the cylindrical portion 18 of the roller 10 is made of a rubber-like elastic body, when the plate material 22 is passed between the cylindrical portion 18 and the cylindrical portion 15 of the roller 9, the roller 9 and the roller 10 are separated as shown in FIG. The cylindrical part 18 of the roller 10 is depressed by the roller 9 through the plate material 22 near the contact area, and the plate material 22 is partially depressed by the surface of the cylindrical part 15 of the roller 9 and the elasticity of the cylindrical part 18 of the roller 10. It is curved so that it is concave upwards. Since the plate material 22 passes through in this state, the plate material 22 is curved at a constant curvature over its entire length, forming the cylindrical body 1.

If the roller 9 is strongly pressed against the roller 10 by the adjustment screw 21, the plate material 22 will be curved with a larger curvature, and a cylindrical body 1 with a small diameter will be obtained.

The cylindrical body 1 shown in FIGS. 1 and 2 is obtained by bending both ends of the cylindrical body 1q in this way inward to form the flange portion 6.

Effects of the Invention According to the present invention, the plate material 22 is punched out from a metal plate.
By simply passing the plate material 22 between a pair of rollers 9 and 10, the plate material 22 can be curved into a cylindrical shape, and step portions 3a, 3b and short cylindrical portions 4a, 4b can be formed at both ends thereof. Thereafter, the cylindrical body 1 shown in FIGS. 1 and 2 as a final product can be manufactured by simply bending and raising the flange portion 6. Therefore, compared to traditional methods,! j
The amount of 2 I is extremely small, and the production equipment does not require a large press or the like; a simple roller is sufficient, and the number of manpower can be greatly reduced.

Example In the method of the present invention, a flat plate is usually used as the plate material 22, but the plate material 22 is not limited to this, and it is also possible to use a plate material 22 with various patterns squeezed out. be.

For example, it is also possible to make a corrugated plate by punching out shallow grooves or protrusions in the vertical or horizontal direction into the center of a plate punched from a metal plate, and passing this between the O-ku 9.10. . As a result, a cylindrical body 1 having a striped pattern formed on the circumferential surface of the body 2 is obtained. In this case, the roller 10
Since the cylindrical portion 18 of is made of a rubber-like elastic body, the roller 1
The cylindrical portion 18 of 0 can be deformed according to the surface pattern of the plate material 22, and the grooves and protrusions are not crushed between the rollers 9 and 10. Therefore, there is no need to carve a pattern on the outer peripheral surfaces of the rollers 9 and 10.

In the present invention, the cylindrical body 1 with a pattern formed on the body 2 can be obtained by using the plate material 22 with a pattern squeezed out in advance as described above. By carving, it is possible to form a pattern on the body portion 2 at the same time as bending the flat plate material 22.

FIG. 3 shows an example thereof. The roller 9 has a diameter Pi that is approximately equal to or slightly smaller than the inner diameter of the cylindrical body 1! The circumferential surface of the cylindrical portion 15 is engraved with a wave pattern 23 in the length direction, and a portion 24 without the pattern 23 is formed in a part of the circumferential surface. ing.

Then, the flat plate material 22 is placed with its tip located in the area 24 without the pattern 23, and is passed between the rollers 9 and 10 while being strongly pressed against the rollers 9 and 10. As a result, the plate material 22 is squeezed by the pattern 23 of the roller 9 and the pattern 23
While being transferred, the cylindrical body 1 is curved so as to wrap around the outer periphery of the roller 9, and the cylindrical body 1 having a pattern on the body 2 is obtained. Then, the end of the plate material 22 passes through the portion 24 of the roller 9 without the pattern 23 again, and the processing is completed.

In this method, the pattern 23 is not transferred to the portion of the cylindrical body 1 that will become the flange portion 6, and the notch 7 is not transferred.
Even if a non-patterned area is required around the area, it can be easily processed if the roller 9 and the plate 22 are properly positioned.

In addition, in the present invention, not only the cylindrical product as shown in FIG.
By changing the pressing force according to 1.21, it is also possible to obtain a truncated conical product.

In addition, step portions 3a at both ends of the body portion 2 in the cylindrical body 1,
3b and the short cylindrical portions 4a, 4b do not need to be the same in shape, and may be made different depending on their use.

The cylindrical body 1, which costs JPY 3Δ according to the present invention, can be used not only as the body of an electric water heater, but also as the body of a magic bottle, electric rice cooker, etc., and various cans. Further, both ends of the obtained cylindrical body 1 can be joined to form a cylinder, not only when forming the cutout 5 as shown in FIG. 2, but also as needed depending on the intended use.

[Brief explanation of the drawing]

FIG. 1 is a front view of an apparatus for implementing the method of the present invention, and FIG. 2 is a central cross-sectional view showing a state in which a plate is bent by the apparatus. FIG. 3 is an enlarged cross-sectional view of main parts showing an embodiment of the present invention. 4 and 5 show a cylindrical body manufactured according to the present invention, and FIG.
The figure is a central vertical cross-sectional view, and FIG. 5 is a cross-sectional view. 9... Metal roller 10... Elastic roller 15.18... Cylindrical portion 16.20.
...Stepped portion 22...Plate material

Claims (1)

[Claims] 1. Steps on both ends (
16), and has a metal roller (9) having a cylindrical part (15) in the center, and metal step parts (20) at both ends that match the outer shape of both ends of the product, A roller (1) having a cylindrical part (18) made of a rubber-like elastic body in the center.
0) and each of the cylindrical portions (
A method for manufacturing a cylindrical body made of a metal plate, characterized in that a metal plate material (22) is pressed between both rollers (9, 10) while rotating with the rollers (15, 18) in pressure contact with each other.