Extrusion die for a metal tube

Abstract

The invention discloses an extrusion die for a metal tube. The extrusion die comprises a die core seat, wherein a runner communicating a feeding port and a discharging port of the die core seat is spirally distributed around the axis of the die core seat. According to the extrusion die for the metal tube, after a molten metal material spirally flows to the discharging port and is extruded from the discharging port, the metal material is not extruded in the single axial direction of the die core seat by the extruding pressure any more and bears circumferential extruding pressure simultaneously, so that different positions of the circumference of the metal tube bear more uniform extruding pressure in the forming process, the molten metal material is more uniformly and annularly distributed, phenomena of thickness difference of different positions of the circumference of a produced metal tube as well as irregular excircle shape of the metal tube are reduced and even avoided, and the production quality of the metal tube is remarkably improved.

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...

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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

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