Internal peeling core head for hollow tube and drawing device thereof

Abstract

The invention discloses an internal peeling core head for a hollow tube and a drawing device thereof, and belongs to the field of design of tube stretching moulds and solving the technical problem that the defect of the inner surface of a tube blank during hollow tube drawing cannot be eliminated. The internal peeling core head comprises a core head body, wherein a tapered peeling edge is formed at a junction of the outer side surface and the back end surface of the core head body; and a taper angle of the peeling edge is 66-90 degrees. The internal peeling core head is used for internally peeling and drawing the hollow tubes, such as a red copper tube and a brass tube.

Description

【Technical field】 [0001] The invention relates to an inner peeling core head of a hollow pipe and a stretching device thereof, belonging to the field of pipe stretching die design. 【Background technique】 [0002] The production of existing copper, copper alloy and other non-ferrous metal alloy pipes generally adopts the process of ingot casting→extrusion→stretching. There are strict requirements on the quality of the outer surface of the product, and the pipes that tend to be zero-defect are widely used: ingot → extrusion → stretching → external peeling → finished product stretching, and the stretched (with stretching chuck) For the copper tube billet, use the outer peeling die on the stretching machine, use the cutting edge of the outer peeling die to peel off the outer surface defects of the copper tube, and then stretch the finished product to achieve a copper tube with a zero-defect outer surface. However, for pipes that have strict requirements on the quality of the in...

AI Technical Summary

Problems solved by technology

However, for pipes that have strict requirements on the quality of the inner surface, the methods of polishing the surface of the extruded perforating needle and the surface of the stretched core to improve the surface hardness and reduce the entry of foreign matter into the inner surface of the copper pipe during the processing are generally used in China to reduce various New defects on the inner surface of the process are generated, but the defects on the inner surface of the tube blank cannot be eliminated

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