FOUR-LAYER CRIMPING STRUCTURE OF SMALL THREE-PIECE IRREGULAR CAN AND SEAMING METHOD THEREOF

Abstract

A crimping structure of a small irregular can and a manufacturing method thereof, in particular to a seam method for buckling a bottom by stamping. The crimping structure includes a can body crimping edge and a can bottom crimping edge made of a plate material of a same type, wherein the can body crimping edge covers the can body crimping edge to crimp 90 degrees inward. A four-layer structure with a first can body crimping edge layer, a can bottom crimping edge layer, a second can body crimping edge layer and a can bottom layer, arranged in a sequence, is formed. By adopting the above-mentioned four-layer crimping structure of the small three-piece irregular can, the sealing performance of the can body is greatly enhanced, effectively improving the moisture-proof performance, thereby protecting the safety of food in the can.

Claims

1. A four-layer crimping structure of a small three-piece irregular can, comprising: a can body crimping edge and a can bottom crimping edge made of a plate material of a same type, wherein the can body crimping edge covers the can body crimping edge crimp 90 degrees inward; a four-layer structure with a first can body crimping edge layer, a can bottom crimping edge layer, a second can body crimping edge layer and a can bottom layer arranged in a sequence is formed.

2. The four-layer crimping structure of the small three-piece irregular can according to claim 1, wherein a can body and a can bottom made of a plate material with a thickness of 0.23 mm have the can body crimping edge with a length of 4.5 mm and the can bottom crimping edge with a length of 3 mm.

3. A seam method of a five-layer crimping structure of the small three-piece irregular can according to claim 2, comprising the following steps: {circle around (1)} selecting the plate material with the thickness of 0.23 mm for blanking and cutting to make the can body and the can bottom respectively; {circle around (2)} pre-bending an end of the can body crimping edge, wherein a pre-bending length of the end of the can body crimping edge is 0.8-1.2 mm; {circle around (3)} placing the can bottom inside the can body and sleeving the can bottom on a bottom die with a root of the can bottom crimping edge and a root of the can body crimping edge on a same horizontal line; {circle around (4)} forming a first stamping on the can bottom and the can body, wherein a first stamping upper die is a crimping die, a die cavity of the crimping die is an union of a semi-circular arc and a rectangle, a diameter of the semi-circular arc is 2.1 mm, and a size of the rectangle is 2.11.05 mm; {circle around (5)} forming a secondary stamping based on step {circle around (4)}, wherein a secondary stamping upper die is a linear die.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic structural diagram of the small three-piece irregular can of the present invention.

[0011] FIG. 2 is an enlarged view of the four-layer crimping structure shown in FIG. 1.

[0012] FIG. 3 is a structural diagram of a crimping edge before the four-layer crimping structure of the small three-piece irregular can of the present invention is formed by seaming method.

[0013] FIG. 4 is an enlarged view of FIG. 3.

[0014] FIG. 5 is a schematic diagram of the crimping die.

[0015] FIG. 6 is a schematic diagram of the linear die.

[0016] FIG. 7 is one of the schematic diagrams of the crimping structure after the crimping is formed.

[0017] FIG. 8 is another one of the schematic diagrams of the crimping structure after the crimping is formed.

DETAILED DESCRIPTION

[0018] Hereinafter, the present invention is described in detail with reference to the drawings,

[0019] As shown in FIGS. 1, 2, and 3, the four-layer crimping structure of the small three-piece irregular can of the present invention includes can body 1, can body crimping edge 11, can bottom 2 and can bottom crimping edge 21 made of the plate material of the same type. When can body 1 and can bottom 2 are made of the plate material with the thickness of 0.023 mm, the length of can body crimping edge 11 of the can is 4.5 mm, the length of can bottom crimping edge of the can is 3 mm. Can body crimping edge 11 covers the can bottom crimping edge 21 to crimp 90 degrees inward. A four-layer structure with first can body crimping edge layer 111, can bottom crimping edge layer 212, second can body crimping edge layer 113 and can bottom layer 214 arranged in sequence is formed. With such a crimping structure, there is no void inside the crimping, effectively improving the sealing performance of the seam structure. Can body crimping edge 11 and can bottom crimping edge 21 are crimped inward, so that there is no visible flange at the bottom of the can body, the overall aesthetic effect of the can body is not affected by the crimping of the bottom cover, and the appearance is also beautiful.

[0020] The above-mentioned seam method of the four-layer crimping structure of small three-piece irregular can is as follows.

[0021] First, the can bottom and the can body are manufactured according to the prior art, as shown in FIGS. 3, 4, 5 and 6.

[0022] The first step: pre-bending end 11a of can body crimping edge 11, the pre-bending length of the end 11a is 0.8-1.2 mm, as shown in FIGS. 3 and 4.

[0023] The second step: placing can bottom 2 inside can body 1 and sleeving can bottom 2 on the bottom die with root 21b of can bottom crimping edge 21 and root 11b of can body crimping edge 11 on the same horizontal line, as shown in FIG. 4.

[0024] The third step: forming the first stamping on the can bottom and the can body, the first stamping upper die is a crimping die, the die cavity of the crimping die is the union of a semi-circular arc and a rectangle, the diameter of the semi-circular arc is 2.1 mm, and the length of long side A of the rectangle is 2.1 mm, the length of short side B of the rectangle is 1.05 mm, as shown in FIG. 5.

The forth step: forming the secondary stamping based on the third step to tightly compress the crimping and eliminate rebound, the secondary stamping upper die is a linear die. As shown in FIG. 6, the crimping structure shown in FIG. 7 is obtained by using the linear die shown in FIG. 6. Certainly, according to the customer's requirements for linear shapes, different linear shapes can be obtained by changing the linear die to meet the customer's needs. As shown in FIG. 8, the linear shape is flat.