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Manufacturing method of magnesium alloy bar

A magnesium alloy and bar technology, applied in the direction of metal rolling, metal rolling, metal processing equipment, etc., to achieve the effect of high efficiency, improved strength and toughness, and simple process

Active Publication Date: 2020-02-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method to reduce the anisotropy of the material and further improve its mechanical properties in view of the problem of anisotropy in the rods obtained by extrusion deformation.

Method used

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  • Manufacturing method of magnesium alloy bar
  • Manufacturing method of magnesium alloy bar
  • Manufacturing method of magnesium alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Select pure magnesium rods as raw materials (purity is 99.9), machine the pure magnesium into rods with a diameter of 60 mm and a height of 100 mm, preheat in a heat treatment furnace filled with argon (preheating temperature is 300 ° C, holding time is 30 minutes), put it into the ingot barrel of the extruder for extrusion (note that the ingot barrel is also preheated to 300°C in advance), and extrude it into a rod with a diameter of 12mm (the extrusion ratio is 25 , the extrusion speed is 0.2mm / s), and then the extruded rods are preheated in a heat treatment furnace filled with argon (the preheating temperature is 300°C, and the holding time is 15 minutes), and the preheated rods are The material is taken out and rolled immediately (rolling speed is 0.2m / s). The rolling process is as follows: select the roll gap as 11mm diamond-shaped hole for the first rolling pass, and then rotate clockwise 90 degrees to make the roll gap 10mm square hole In the second pass of rolli...

Embodiment 2

[0046] Choose Mg-3.0Al-1.1Zn-0.3Mn (AZ31) as the raw material, and homogenize it in a heat treatment furnace filled with argon atmosphere (the temperature is 450°C, and the holding time is 12 hours). quenched in warm water, and then machined it into a rod with a diameter of 60 mm and a height of 100 mm, and then preheated it in a heat treatment furnace filled with argon (the preheating temperature is 300 ° C, and the holding time is 30 minutes). Put it into the ingot barrel of the extruder to prepare for extrusion (note that the ingot barrel is also preheated to 300°C in advance), and extrude it into a rod with a diameter of 20mm (the extrusion ratio is 9, and the extrusion speed is 0.2 mm / s), and then preheat the extruded rods in a heat treatment furnace filled with argon (the preheating temperature is 300°C, and the holding time is 15 minutes), and the preheated rods are taken out and rolled immediately (rolling speed is 0.5m / s), select the roll gap as 19mm diamond-shaped ho...

Embodiment 3

[0051] Choose Mg-3.0Bi-0.5Ca (BX30) as the raw material, and homogenize it in a heat treatment furnace filled with argon atmosphere (temperature is 400°C, holding time is 12 hours), after homogenization, put it in warm water at 35°C Quenching, then machining it into a rod with a diameter of 60 mm and a height of 100 mm, and then preheating it in a heat treatment furnace filled with argon (the preheating temperature is 300 ° C, and the holding time is 30 minutes) and then put it into the extruder. The ingot barrel of the press is ready to be extruded (note that the ingot barrel is also preheated to 300°C in advance), and extruded into a rod with a diameter of 12mm (the extrusion ratio is 25, and the extrusion speed is 0.1mm / s ), and then preheat the extruded rods in a heat treatment furnace filled with argon (the preheating temperature is 300°C, and the holding time is 15 minutes), and the preheated rods are taken out and rolled immediately (rolling The rolling speed is 0.2m / s)...

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Abstract

The invention discloses a manufacturing method of a magnesium alloy bar. The manufacturing method of the magnesium alloy bar comprises the following steps that a raw blank is machined, so that the baris obtained; the bar is extruded; the bar is preheated; and the obtained magnesium alloy bar is subjected to hole pattern rolling operation, the rolling operation is conducted in sequence according to the diamond-square mode, 1-4 passes are conducted through the rolling operation, the rolling speed is 0.1m / s-0.5m / s, the bar is rotated by 90 degrees when each pass is changed in the rolling process, finally the square hole serves as the final rolling pass, the correction is conducted for one time, and therefore the final form of the bar can be guaranteed. By the adoption of the manufacturing method of the magnesium alloy bar, the anisotropy of the bar which is extruded to deform can be remarkably improved, and the toughness of the bar can be further improved.

Description

technical field [0001] The invention relates to the field of metal materials and metal material processing, in particular to a method for improving the mechanical properties of magnesium and its alloy bars through extrusion composite multi-pass rolling. Background technique [0002] As the lightest metal structural material, magnesium alloy has high specific strength and rigidity, good impact resistance, and can be 100% recycled. It has broad application prospects in the fields of automobile, aerospace, electronic products and so on. However, compared with other materials, the mechanical properties of most magnesium alloys are low, and how to further improve their mechanical properties has been a hot research topic at home and abroad in recent years. [0003] Alloying is a commonly used method to improve the mechanical properties of materials. The addition of rare earth elements can significantly improve the mechanical properties of cast and deformed magnesium alloys. Howev...

Claims

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Application Information

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IPC IPC(8): B21C37/04B21B1/20B21B27/02C22F1/06
CPCB21B1/20B21B27/024B21C37/04C22F1/06
Inventor 余晖范少达刘浩秦嘉楠董小锐
Owner HEBEI UNIV OF TECH
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