Secondary composite die

Abstract

The invention discloses a secondary composite die. The secondary composite die comprises a die C and a die D. A die C upper die punch pin is arranged in the corresponding position above the die C. The die C comprises an inner die and a primary composite outer die. The inner die is sleeved with the primary composite outer die to form a combined lower die. A die D upper die punch pin is arranged in the corresponding position above the die D. The die C and the die D are combined to form the secondary composite die. The primary composite outer die is cylindrical. The outer side of the bottom of the primary composite outer die is provided with a convex ring. The inner side of the bottom of the primary composite outer die is provided with an expansion port. The inner side of the top of the primary composite outer die is provided with a snap ring inclining inwards. The inner die is cylindrical. The outer side of the bottom of the inner die is provided with an inner die convex ring. The inner side of the top of the inner die is provided with an inner die snap ring inclining inwards. The outer diameter of the inner die convex ring of the inner die is greater than the inner diameter of the primary composite outer die and less than the outer diameter of the convex ring. The die D is cylindrical. The outer side of the bottom of the die D is provided with a die D convex ring. The inner side of the top of the die D is provided with a die D snap ring inclining inwards.

Description

Technical field [0001] The invention belongs to the technical field of molds, especially secondary composite molds. Background technique [0002] At present, the battery steel shells are produced using progressive continuous ordinary molds, straight up and down, and single die punching. Only ordinary straight-walled steel shells can be produced. The steel shells produced have large limitations and wall thickness, resulting in small steel shell capacity. It cannot meet the basic requirements of the existing large-capacity lithium battery steel shell. Summary of the invention [0003] The present invention aims to overcome the defects of the prior art. The present invention designs a secondary composite mold, which has the advantages of fast forming, more precise size control, and the ability to punch a new type of smooth transition steel shell with different wall thicknesses twice. [0004] In order to solve the above technical problems, the present invention provides the following ...

AI Technical Summary

Problems solved by technology

[0002] At present, the production of battery steel shells uses progressive continuous ordinary molds, which are straight up and down, and the mold is punched in a single way. Only ordinary straight-walled steel shells can be produced. The steel shells produced have large limitations and thick walls, resulting in small capacity of the steel shells. Unable to meet the basic requirements of the existing high-capacity lithium battery steel case

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