JPH0252132A - Manufacture of can body - Google Patents

Abstract

PURPOSE:To prevent the metallic material of a can barrel sheet from melting through and protruding by cutting each corner of the can barrel sheet in a triangular shape having respectively a specified length on each side in the width direction and in the lengthwise direction. CONSTITUTION:Each of the four corner of the can barrel sheet 1 is cut in a triangular shape having each side (a), (b), giving a length (b) equal to the width of a seam in the width direction and a length (a) in the lengthwise direction. The length (a) does not exceed the width of the seam, or in a seam welding time, the metallic sheet material is melted and flows out along the seam in the extensive direction of the seam as far as the distance within the edge of the can barrel sheet. This distance is a length not exceeding (b), generally, (b) or below (b), and 1/2 of (b) is selected preferably. Accordingly, in the seam welding, the width of the metallic flow 15 of the can barrel sheet is equal to the seam width and the projecting point does not protrude from the edge in the lengthwise direction of the uncut can barrel sheet. The edge of the square barrel 4 is folded outward and radially to form a barrel flange 6 containing cut seams.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to the manufacture of can bodies, particularly 18. The present invention relates to an improvement in the manufacturing method of can bodies for petroleum and other oils such as l.

[Conventional technology]

Conventionally, the above-mentioned can body is made by forming the can body plate 1 shown in FIG. 9 on the body of a square tube 4 as shown in FIG. Bend it outward to form a fuselage flange 6 as shown in Figure 12, and attach the top and bottom plates 2 to the opening of the square tube.
to crown. Since attaching the other top and bottom plates to the bottom is the same, only the top plate will be described. The top plate is previously flat-bottomed and has a radial peripheral flange 7 extending parallel to the bottom through a wall 3 that rises from the periphery of the bottom. The width of the flange 7 is long enough to cover the fuselage flange 6, and from the middle thereof rises parallel to the wall 3 and descends toward the bottom 9.
Figure 14). When the top plate 2 is placed over the opening, the peripheral flange 7 rests on the body flange 6, and the downward slope 9 is placed on the body flange 6.
Bend it to the opposite side to wrap around the flange 6, and then fold both flanges 6
．． 7 are integrated and double-sealed tightly toward the wall 8 of the body to produce a can body. Before processing the fuselage flange of the access fuselage 4, it can be added that the welded part is repaired to protect the contents.

[Problem to be solved by the inventionffl] In the conventional manufacturing method, when welding is carried out along the seam 5 of the can body plates during the production of the body, the material metal of the body plate flows along the joint, and the tip of the elution flow 20 projects triangularly from the can body plate in the direction of extension of the joint (Fig. 11.13). Above process neutral descent 9? Since there is a protruding part 20 which is wrapped around the fuselage flange 6, the peripheral flange 7 has to be lengthened by the protrusion of the ejecting part.

In the case of double seaming, the narrow triangular part at the tip of the elongated part bends toward the body wall 8 side, causing a seaming problem. Also, after seaming, the body flange 6 and the falling part 9 other than the joint are the spout part 20? : Between the body hook 6a consisting of the rolled-up part and the cover hook 95, the cover hook becomes short and a gap 21 is created between both hooks, resulting in insufficient winding by both hooks.

[Means to solve the problem]

The body is formed by contacting the body along the seam, and the lengthwise edge of the body is bent outward radially to form a body flange.The flat-bottomed top plate 2 with a flange on the periphery is inserted into the opening of the body. The body flange is wrapped with a peripheral flange attached to the can body flange, and both flanges are bent toward the body and double wrapped. Cut it into a triangular shape, with one side of the length being within the range of sound tightening and the other side being a distance that does not allow the elution flow of the can body plate to go beyond the edge of the can body plate during welding. This is a method for manufacturing a can body made of aluminum. Among the above cut lengths, it has been experimentally found that the length in the length direction (V) is good, and the length in the width direction is preferably double the length in the width direction (-). It's confirmed.

〔Example〕

Describe one embodiment with reference to the drawings below. In the drawings, the same numbers are used for the same members as in the conventional example described above. Second
The can body plate 1 shown in the figure is bent to have a square width, and as shown in FIG. 3, the seams 5 are overlapped and welded to form a square tube 4. As shown in the enlarged view of Fig. 2A, the four corners of the can body plate 1 have a length b equal to the width of the VC joint in the width direction, and a length a'l in the length direction, and the lengths α and b are is cut into a triangle with both sides. The length σ is within the tightening range described below, and is the length of the metal plate material that elutes during seam welding, flows along the seam in the direction of extension of the seam, and ejects from the edge of the can body plate to the distance of the dowel. . This length is chosen not to exceed length b, usually less than 6, preferably a double minus of length b. Therefore, during seam welding, the width of the gold II4 flow 15 of the can body plate maintains the width of the seam 5, and the projecting light does not protrude from the longitudinal edge of the can body plate that is not cut (FIG. 4). (The edges of the square tube 4 are shown in Figure 5.)

As shown in FIG. 6, it is bent outward and radially to form a fuselage flange 6 including the cut seam. The top plate 2 is the same as the conventional type and is placed over the opening of the square tube 4 (7th
(Figure), the top plate is attached by aligning the peripheral flange 7 with the body flange 6, wrapping the body flange 6 with the flange 7, and double-sealing it in the conventional manner. The base plate is attached to the bottom in the same way, but since the process is exactly the same, the installation will be omitted.

The above is a method for manufacturing a square tube, but a circular or oval tube 4
, be made in the same way.

〔Effect of the invention〕

In the present invention, as described above, the four corners of the can body plate are cut out in a triangular shape with α as one side, with predetermined lengths in the width direction and the length direction, so that the metal material of the can body plate can be used during seam welding. The eluted flow from the seam expands in the width direction of the seam, does not extend beyond the level of the uncut edge of the can body plate in the length direction of the seam, and also ensures that the triangular cut portion is within the range of seaming. Therefore, when the top and bottom plates are applied to the opening and the peripheral flange wraps the fuselage flange and two-point seaming is performed, the circumference of the fuselage flange that does not erupt is well wrapped by the peripheral flange and the fuselage wall 8
It is tightened towards. As shown in Fig. 1, the body hook 6α is short, and the cover hook 96 is deeply inserted between the body hook 6a and the fuselage wall 8, allowing relatively short double seaming in the length direction instead of the length direction. (・There is an effect.

[Brief explanation of the drawing]

1 to 7 illustrate the method of the present invention, and FIGS. 8 to 14 correspond to the conventional method. Fig. 1 is a longitudinal cross-sectional view of the joint portion of the can body wrapped with the top and bottom plates manufactured by the method of the present invention, and Fig. 2 is a plan view of the can body plate.
Fig. 2A is an enlarged view of the corner of Fig. 2, Fig. 31 is a perspective view of the cylindrical body, Fig. 4 is a perspective view of four welded seams, Fig. 5 is a perspective view of the cylindrical body after flange formation; Figure 6 is an enlarged perspective view of the flange of the joint in Figure 5, Figure 7 is a perspective view of the joint when the top and bottom plates are installed, and Figure 8 is the vertical FII of the joint by the conventional method.
T11N], FIG. 9 is a plan view of the can body plate, and FIGS. 10, 11, 12, 13, and 14 are respectively 3
Fig. 4, Fig. 5, Fig. 6, and Fig. 7 V (views showing corresponding conventional examples. 1: Can body plate 2: Top and bottom plate 4: Cylindrical body 5: Seam 6: FI 4 body flange 9: Falling 2〇2 spout part

Claims (1)

[Claims] 1. The body is formed by welding both ends of a can body plate bent into a cylindrical shape along the overlapping seam, and the longitudinal edges of the body are bent radially outward to form the body. A flat-bottomed top and bottom plate with a flange on the periphery is placed against the opening of the body, the peripheral flange is wrapped around the body flange, and both flanges are folded toward the body and double wrapped. The four corners of the body plate should be one side with a length that does not exceed the width of the seam in the width direction, and the elution flow of the can body plate during welding should be within the range of seam tightening in the length direction. A method for producing a can body, characterized in that the can body is cut into a triangular shape, with the other side having a length up to a distance that prevents the can body from ejecting. 2. The method for manufacturing a can body according to claim 1, wherein the length of the other side in the length direction in which the can body plate is cut is a length that does not exceed the length in the width direction. 3. The method for producing a can body according to claims 1 and 2, wherein the length of the other side in the length direction in which the can body plate is cut is one half of the length in the width direction. .