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Production process of magnesium alloy medium-thick-wall tube with ultra-fine grain structure

A technology of ultra-fine grain and manufacturing process, applied in the direction of engine components, mechanical equipment, etc., can solve the problems of different grain size, pipe size, extrusion ratio limitation, etc., to achieve good mechanical properties, comprehensive mechanical properties improvement, High productivity effect

Inactive Publication Date: 2012-08-15
江苏诚德钢管股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of equipment, the extruded pipe size and extrusion ratio are limited, and the plastic deformation cannot be fully performed. Many grains cannot be fully broken, the grain sizes are different, and the anisotropy of the pipe is serious.

Method used

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  • Production process of magnesium alloy medium-thick-wall tube with ultra-fine grain structure

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Experimental program
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Embodiment Construction

[0019] The production of magnesium alloy pipes with ultra-fine grain structure of grade AZ31B and product specification ф60mm×15mm is illustrated as an example.

[0020] Its specific production method is as follows:

[0021] 1. Softening annealing: Take the surface and clean it to confirm that there is no crack defect. The specification: ф80mm×25mm, the extrusion ratio is greater than 2.5, and the magnesium alloy extruded tube billet is heated to 330°C and kept for 0.5h.

[0022] 2. Radial forging:

[0023] The magnesium alloy extruded tube billet is repeatedly cycled for rotary forging, intermediate annealing and cooling.

[0024] Apply water-soluble lubricant or solid lubricant to the tapered mandrel to facilitate the mandrel to come out.

[0025] Hammer head speed / forging frequency: greater than 150 times / min to 900 times / min.

[0026] The rotation speed of the forging / the number of revolutions of the chuck N=3~13 rPm.

[0027] Axial feed speed / blank feed speed V: 0...

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Abstract

The invention relates to a production process of a magnesium alloy medium-thick-wall tube with an ultra-fine grain structure, belonging to the technical field of non-ferrous metal processing. The production process comprises the following steps: firstly, softening and annealing: heating a magnesium alloy extrusion tube blank with the extrusion ratio greater than 2.5 to 330 DEG C and insulating for 0.5 hour; then carrying out radial forging: repeatedly and circularly carrying out rotary forging, intermediate annealing and cooling machining on the magnesium alloy extrusion tube blank; and carrying out finishing, distressing annealing and finish machining. The magnesium alloy tube produced by the radial forging method is subjected to room-temperature rotary forging and the production process is automatically controlled. During forging, the tube blank is sleeved on a core rod and mounted on a chuck; the chuck feeds the core rod and the blank sleeved thereon into a forging box while rotating, and the tube blank on the core rod is radially stroke by more than 3 hammers and then deformation is finished. The tapered core rod is coated with soluble lubricant so that the core rod can be easily pulled out.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal processing, in particular to the technical field of manufacturing a medium-thick-walled magnesium alloy pipe with an ultrafine grain structure. Background technique [0002] Magnesium alloys have the advantages of low density, good electromagnetic shielding, high specific strength and rigidity, strong shock resistance, easy machining, and recycling. At present, most magnesium alloy pipes are produced by die-casting, die-casting and semi-solid forming processes. Products produced by these processes have disadvantages such as uneven structure, composition segregation, and low mechanical properties, and cannot give full play to the performance advantages of magnesium alloys. Plastic deformation can improve the microstructure and mechanical properties of magnesium alloys, and greatly increase the strength and plasticity of magnesium alloys. For example, extrusion is used to plastically proc...

Claims

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Application Information

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IPC IPC(8): B21K1/14C22F1/06
Inventor 张铮陈忠谭明徐国荣权高峰于超王鹏展王林林
Owner 江苏诚德钢管股份有限公司