Cold machining and molding method of magnesium alloy pipes

A forming method and magnesium alloy technology, which is applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems that limit the application and development of magnesium alloys, material mechanical properties, geometric dimension accuracy and appearance quality, and cannot meet the requirements. , to achieve the effect of low cost, excellent mechanical properties and precise size

Inactive Publication Date: 2008-12-17
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of extrusion equipment and die size, the minimum outer diameter of magnesium alloy extruded tube billet is about 13.5mm, and the material mechanical properties, geometric dimension accuracy and appearance quality are poor, so it cannot meet the high-tech fields such as aviation and aerospace. The demand for complex parts and components in precision equipment limits the application and development of magnesium alloys in many fields such as national defense and civil use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Magnesium alloy AZ31 pipe Φ125×4.5mm cold processed to Φ100×3.0mm:

[0012] Choose Φ125×4.5mm magnesium alloy AZ31 casting billet, through vacuum heat treatment, set temperature 250±10°C, heat treatment and tempering for 12 hours, so that the pipe billet structure is equiaxed crystal, the average grain size is about 30μm. Choose the LD120 cold rolling mill to cold-roll the pipe, the feeding amount of the tube billet is selected to be 7-10mm / time, and the stroke speed of the working frame is 22-25 times / min. For the first rolling pass, a Φ115mm roll is selected and a Φ107mm core head is matched, the deformation ε of the control pass is about 18.1%, and the ratio Q value of the relative wall reduction to the relative diameter reduction is about 1.4. In the second pass, Φ105mm roll and Φ98mm core head are selected, the deformation amount ε of the control pass is about 20.0%, and the ratio Q value of the relative wall reduction amount to the relative diameter reduction amou...

Embodiment 2

[0014] Magnesium alloy AZ31 pipe Φ70×3.0mm cold processed to Φ60×2.0mm:

[0015] Choose the Φ70×3.0mm magnesium alloy AZ31 hot extrusion tube billet after the complete recrystallization annealing heat treatment, the average grain size is about 20μm. The pipes are cold rolled by LD60 cold rolling mill. The feeding amount of the tube blank is selected as 9-12mm / time, and the travel speed of the working frame is 18-21 times / min. For the first pass, a Φ65mm roll is selected and a Φ60mm core head is matched, the deformation ε of the control pass is about 22.2%, and the ratio Q value of the relative wall reduction to the relative diameter reduction is about 2.3. In the second pass, Φ60mm roll and Φ56mm core head are selected, the deformation amount ε of the control pass is about 25.8%, and the ratio Q value of the relative wall reduction amount to the relative diameter reduction amount is about 2.3. The intermediate heat treatment system is as follows: choose a resistance furnace ...

Embodiment 3

[0017] Magnesium alloy AZ31 pipe Φ13.5×1.5mm cold processed to Φ10×1.0mm:

[0018] Choose Φ13.5×1.5mm magnesium alloy AZ31 hot extrusion tube billet, the average grain size after annealing is about 40μm. Use the LD15 cold rolling mill to cold-roll the pipe, the feeding amount of the tube billet is selected to be 5-8mm / time, and the stroke speed of the working frame is 15-18 times / min. Φ12mm roll and Φ9.5mm core head are selected for the first rolling pass, the pass deformation ε is about 25.5%, and the ratio Q value of the relative wall reduction to the relative diameter reduction is about 1.5. Φ10mm rolls and Φ8mm cores are selected for the final pass rolling, the pass deformation ε is about 34.0%, and the ratio Q value of the relative wall reduction to the relative diameter reduction is about 1.2. The intermediate heat treatment system is as follows: select a vacuum annealing furnace, keep it at 300°C for 0.5h, and anneal in the furnace. After intermediate annealing, the p...

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Abstract

The invention discloses a method for cold machining and forming of magnesium alloy tubes. Magnesium alloy hot-extruded tube blanks or magnesium alloy cast tube blanks going through a vacuum heat treatment are milled into magnesium alloy tubes by a cold mill. The feeding capacity for tube blank ranges from 5 to 15mm/t, the travel speed of a working frame ranges from 15 to 30t/min, the deformation for pass is controlled to be 5 to 25 percent, the accumulated deformation does not exceed 45 percent and the ratio of the relative wall reduction to the relative sizing reduction is controlled to be 0.8 to 3.2; the magnesium alloy tubes after cold work hardening are put into a vacuum heat treatment furnace or pipe type resistance furnace containing protection atmosphere for performing a recrystallization, anneal and intermediate heat treatment, the temperature for the intermediate heat treatment is 200 to 450 DEG C; after thermal insulation is performed for 0.5 to 14 hours, the magnesium alloy tubes are obtained by machining after air cooling or furnace cooling. The working method of the invention is simple and easy to realize, has low cost and can improve the mechanical property of magnesium alloy tubes and the machined tubes have favorable surface quality and high geometrical dimension accuracy.

Description

technical field [0001] The invention relates to a processing method of an alloy pipe, in particular to a cold forming method of a magnesium alloy pipe. Background technique [0002] The density of magnesium metal is low, which is 2 / 3 of aluminum and 1 / 4 of steel. Compared with other metal materials, magnesium alloy has the characteristics of high specific strength and specific stiffness, good thermal conductivity, shock absorption and easy recycling. More and more magnesium alloy materials are used in aviation, aerospace, transportation, communication equipment, electronic products and other fields. These magnesium alloys include pure Mg, AZ21, AZ31, AZ91, AZ91D, AZ80, AZ63, M1, AE21, WE43, LAE442, etc. containing Al, Zn, Mn, Zr, Li, Ca, Sn, Mo, Y, La, Ce, Nd and other trace elements, tensile strength ≥ 180MPa, elongation ≥ 8%, commonly used magnesium alloy pipes have an outer diameter of Φ6-Φ115mm and a wall thickness of 0.6-4.5mm. [0003] Due to the poor plasticity and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B17/02B21B37/16C22F1/06
Inventor 于振涛皇甫强杜明焕尉北玲麻西群刘春潮张亚锋牛金龙韩建业
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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