Extrusion die for metal tube

Abstract

The invention provides an extrusion die for a metal tube. The extrusion die comprises a mold core seat, wherein the outer peripheral surface of the mold core seat is free of a runner, a shape formed by enclosure of the outer peripheral surface is elliptical on the cross section of the mold core seat, and the feeding part of the mold core seat is close to the long axis end position of the ellipse. The extrusion die provided by the invention balances the distribution amount of a molten metal material at each position of the elliptical outer peripheral surface, enables the extrusion amount of the molten metal material at each position of the circumference of a discharging outlet to be balanced to a greatest extent, reduces, even avoids the phenomena of different thickness of different positions at the circumference of the metal tube and an irregular excircle shape of the metal tube, and substantially improves production quality of the metal tube.

Description

technical field [0001] The invention relates to the technical field of pipe material production equipment, more specifically, to an extrusion die for metal pipes. Background technique [0002] In modern industrial technology, metal tubes are widely used in many fields to play different roles. For example, in the cable industry, metal tubes (aluminum tubes or copper tubes) are coated on the outside of the core wire to play armor, static electricity It has many functions such as shielding, water blocking and conducting fault current. [0003] In the prior art, the production process of metal pipes generally includes a segmented long production method and a continuous production method. Among them, the production process of the segmented long production method is to first produce a section of fixed-length pipe sections, and then connect a plurality of pipe sections into pipes with a length that meets the process. Although the production process of this production method is re...

AI Technical Summary

Problems solved by technology

[0004] However, the continuous production method of this kind of metal pipe also has certain defects: because each flow channel arranged on the outer peripheral surface of the core seat all extends along the axial direction of the core seat and the number of flow channels is only 4 , so that the four extrusion chambers formed are all distributed along the axial direction of the core seat. When the molten metal material in the different extrusion chambers distributed in the circumferential direction receives different flow pressures, it will form a ring shape. The axial extrusion pressure of the molten metal material on different parts of the discharge port is uneven, which often leads to differences in the thickness of different parts in the circumferential direction of the produced metal pipes and irregular shapes of the outer circle, which seriously affects the production of metal pipes quality

Images