Combined necking die

A shrinking die, combined technology, applied in metal processing equipment, forming tools, manufacturing tools, etc., can solve the problems of scratches, the surface of the die cannot be replaced by itself, etc.
CN101670400BInactive Publication Date: 2011-11-02LEACREE CHENGDU
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
LEACREE CHENGDU
Publication Date
2011-11-02
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a necking die of a cylinder material, which mainly solves the problems that the current inner and outer supporting necking dies are hard to be changed when being partially damaged and the surface thereof is easy to be scratched when the cylinder material is taken out. The lower die holder (6) of the necking die of a cylinder material is fixed on a pressure device; a die sleeve (8), a cavity (7), a locating plate (5), a guide block (10), a spring (11) and a material returning block (9) are arranged in the lower die holder (6) to form a material returning mechanism; a mandrel (3) is closely fastened with a pressing sleeve (1); the inner diameter of the guide sleeve (4) is the same as the outer diameter of the cylinder material (2); and the shape and size of the cavity (7) are the same as the shape and size of the necking diameter. After the mode is adopted, corresponding parts can be changed when the cavity or other parts are damaged, thus reducing the cost; andwhen returning materials, the cylinder material and the mandrel can be pushed out simultaneously, thus reducing the surface scuffing.
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Description

technical field

[0001] The invention relates to a mold tooling, in particular to a necking mold for cylindrical materials. Background technique

[0002] In the process of processing cylindrical materials, necking is a forming process in which the mouth of a pre-formed cylindrical or pipe blank is reduced through a necking die. The necking process is widely used and can be used for bullets. Shrinking processing of casings, shell casings, steel gas cylinders, bicycle frame risers, bicycle seat saddle pipes, steel pipe drawing, etc. The general operation is to apply pressure to the cylindrical or pipe blank to make it slide towards the die of the shrinking die, and the diameter of the shrinking end of the cylindrical material is reduced under the action of the inner wall pressure of the die. The structure of the necking die is divided into three types: no support, external support and internal and external support according to the support situation. The corresponding support s...

Claims

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