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Novel plastic processing method for high-performance magnesium alloy seamless long pipe material

A technology for plastic processing and magnesium alloys, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of poor mechanical properties, significant texture characteristics and low processing efficiency of magnesium alloy pipes, and achieve mechanical properties improvement, The effect of reducing the probability of cracking and reducing tensile stress

Inactive Publication Date: 2018-12-28
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above situation, the object of the present invention is to provide a magnesium alloy long tube rolling process with simple process, low cost, high efficiency and excellent mechanical properties of the tube, which can effectively solve the problem of poor mechanical properties of magnesium alloy tubes in the prior art and texture characteristics. Obvious problems such as low processing efficiency and low yield

Method used

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  • Novel plastic processing method for high-performance magnesium alloy seamless long pipe material
  • Novel plastic processing method for high-performance magnesium alloy seamless long pipe material
  • Novel plastic processing method for high-performance magnesium alloy seamless long pipe material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The billet used is a cast commercial AZ31 magnesium alloy tube billet, the original size specification is: outer diameter φ51mm, wall thickness 8mm, length 3000mm. The outer diameter of the mandrel used is φ40mm, the outer diameter of the stepped section is φ37mm, and the mandrel is coated with graphite emulsion lubricant. The preheating temperature of the roll is 250°C, the tube blank is heated to 350°C by the heating induction coil, and the mandrel is preheated to 280°C at the same time, and then the shrinking pliers are loaded from three directions at the same time for shrinking. After that, the induction coil works at the speed of heating 350°C per second. At the same time, the mandrel pushes the tube billet to feed at a speed of 1.2m / s. The sub-unilateral reductions are 2mm and 1.5mm, respectively, to obtain a capillary tube with an outer diameter of 44mm and a wall thickness of 2mm. After that, the mandrel is taken out (no need to remove the rod), and a high-plast...

Embodiment 2

[0032] The blank used is an extruded commercial AZ31 magnesium alloy tube blank, and the original size specification is: outer diameter φ90×wall thickness 16mm×length 2500mm. The inner diameter of the mandrel used is φ58mm, and the diameter of the stepped section is φ50mm. After 5 passes of rolling, the unilateral reductions of each pass are: 4mm, 2.5mm, 1.5mm, 1.5mm, 0.5mm; the rod is removed by the stripping machine, and the outer diameter φ70×wall thickness is obtained after cutting to length 6mm×length 7500mm pipe; the roll preheating temperature is 280°C, the necking temperature is 380°C, the unilateral reduction of the jaw is 5mm, the mandrel preheating temperature is 250°C, and the surface of the mandrel is coated with MOS 2 Emulsion lubricant; during the rolling process, the heating rate of the induction coil is: 350°C / s, and the axial feeding speed is 0.85m / s.

[0033] The mechanical properties of the rolled pipe in this embodiment are as follows: the tensile strengt...

Embodiment 3

[0035] The blank used is the cast AZ61 magnesium alloy tube blank, the original size is: outer diameter 146mm x wall thickness 20mm x length 2000mm, the inner diameter of the mandrel used is φ105mm, and the diameter of the stepped section is φ96mm. After 4 passes of rolling, the unilateral reductions of each pass are: 3mm, 2.5mm, 2mm, 0.5mm, the shrinkage temperature is 300°C, the unilateral reduction is 8mm, and the temperature of the induction coil is adjusted to 250°C , the axial propulsion speed of the mandrel is 0.5m / s. The preheating temperature of the mandrel is 250°C, and the preheating temperature of the mandrel is 280°C. The surface of the mandrel is coated with MOS 2 Emulsion lubricant; after stripping and measuring to length, a pipe with outer diameter φ121×wall thickness 8mm×length 5500mm is finally obtained.

[0036] The mechanical properties of the rolled pipe in this embodiment are as follows: the tensile strength is 285Mpa-317Mpa, and the elongation after frac...

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Abstract

The invention provides a novel plastic processing method for a high-performance magnesium alloy long pipe material, comprising the steps of: using a far-infrared heating lamp tube to heat a roll, inserting a mandrel after a pipe blank is heated, using three hammerheads for synchronous tightening, and after mouth shrinkage, ensuring a certain pressing force between the mandrel and the inner wall ofthe pipe blank; when an induction coil is working, enabling the mandrel to drive the pipe blank after the mouth shrinkage into the roll, and conducting reduced-diameter reduced-wall plastic deformation processing on the pipe blank; and after the rolled pipe is subjected to rod removal by a rod conveying set, segmenting the pipe into n sections based on needs. According to the invention, an induction heating manner is used for heating the pipe blanks instead of traditional resistance heating, thereby realizing on-line heating and on-line rolling. An induction heating way is employed for supplementing heat in multiple rolling passes, thereby overcoming the difficulty that magnesium alloy is extremely sensitive to temperature during plastic deformation and precisely controlling the temperature during rolling. Meanwhile, since the rolling process is finished in a thermal insulation box, heat loss with air is weakened.

Description

technical field [0001] The invention belongs to the field of magnesium alloy pipe preparation, and in particular relates to a novel plastic processing method for high-performance magnesium alloy seamless pipe long products. technical background [0002] Magnesium alloy is currently the lightest metal structural material in engineering applications. It has the advantages of high specific strength, high specific stiffness, good damping and shock absorption, good dimensional stability, convenient machining, and easy recycling. High-tech fields such as automobiles and electronics 3C are widely used. However, due to the material properties of magnesium and magnesium alloys, such as poor low-temperature plasticity, easy cracking, fast heat dissipation, significant chilling effect, and narrow plastic deformation temperature range, the plastic processing ability of magnesium alloys is extremely poor, which hinders the further development and application of magnesium alloys. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B17/04B21B27/10B21B45/00B21C45/00
CPCB21B17/04B21B27/106B21B45/004B21C45/00
Inventor 马立峰邹景锋朱艳春黄庆学黄志权林金宝楚志兵刘光明
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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