Extrusion device and extrusion method for pipe with constant inner diameter and increased wall thickness at both ends

Abstract

The invention discloses a squeezing device for a tubular material with the unchanged inner diameter and the increased thicknesses of both end walls. The squeezing device comprises a piercing die rod, a front-section outer diameter shaping die, a middle-section outer diameter shaping die, and a rear-section outer diameter shaping die, wherein the front-section outer diameter shaping die comprises a front-section annular outer die, a front-section sealing die, a first radial driving cylinder and a first axial driving cylinder; the middle-section outer diameter shaping die is provided with a first heating device for heating a blank; the rear-section outer diameter shaping die comprises a rear-section annular outer die, a rear-section sealing die, a second radial driving cylinder and a second axial driving cylinder. The invention further discloses a squeezing method for the squeezing device for the tubular material with the unchanged inner diameter and the increased thicknesses of the both end walls. According to the squeezing method provided by the invention, a front-end tube section, a middle tube section and a rear-end tube section of an aluminum-alloy tube can be squeezed and formed by means of selecting different squeezing dies in a squeezing process; the aluminum-alloy tube with the increased outer diameters of the both ends are squeezed once; the short flow in the production process and the low production cost are realized; meanwhile, the entire quality of a product is uniformly stable; the inner and outer circles of each section of the aluminum-alloy tube have the good coaxiality; the product quality is high.

Description

technical field [0001] The invention relates to an extrusion die and an extrusion method, in particular to an extrusion device and an extrusion method for a long tube with enlarged outer diameters at both ends. Background technique [0002] According to the regulations of GB / T20659-2006, the aluminum alloy drill pipe is extruded from the aluminum alloy with the minimum yield strength of 325-480MPa. [0003] In the prior art, there is an extrusion die for extruding aluminum alloy tubes with inconsistent inner diameters. This die is mainly composed of an outer mold for determining the outer diameter of the aluminum alloy tube and a core rod for determining the shape of the inner diameter of the aluminum alloy tube. The core rod is based on the shape of the aluminum alloy tube. The shape of the inner diameter is made into a stepped shaft shape. During the extrusion process, the radial distance between the outer mold and the core rod is adjusted by moving the core rod, so as to ...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide an extrusion device and extrusion method for pipes with constant inner diameter and increased wall thickness at both ends, so as to solve the problems existing in the production of pipes with variable outer diameter by existing extrusion forming devices

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