Room temperature hydrostatic liquid extrusion pressing deforming strengthening technique of magnesium alloy

A technology of hydrostatic extrusion and deformation strengthening, applied in the field of room temperature hydrostatic extrusion deformation strengthening process of magnesium alloys, can solve the problems of narrow processing parameter window, low mold service life, growth of grain structure, etc. Surface finish, less die wear, uniformity across section and length

Inactive Publication Date: 2010-05-26
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of high-temperature oxidation, narrow window of processing parameters, growth of grain structure, large tendency of die sticking and low service life of dies in the traditional hot extrusion process, and provide a deformation strengthening method with low cost. , and can greatly improve the mechanical properties, improve the service life of the mold and improve the surface finish of the magnesium alloy room temperature hydrostatic extrusion deformation strengthening process

Method used

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  • Room temperature hydrostatic liquid extrusion pressing deforming strengthening technique of magnesium alloy
  • Room temperature hydrostatic liquid extrusion pressing deforming strengthening technique of magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The design extrusion ratio is 1.1, and the size of the extrusion die 8 is φ10mm (that is, the diameter of the finished product after extrusion, the same below). The process steps are as follows:

[0024] 1. According to the pre-designed extrusion ratio, the processing size of the ZK60 magnesium alloy billet is calculated to be φ10.49mm, and the magnesium alloy billet 6 is turned according to the calculated size. The size of the guide section is φ10mm×6mm, and it is ensured that the guide section and the deformation section have a unilateral 20°±0.2° taper transition to ensure the sealed connection between the blank and the extrusion die 8 . The 20°±0.2° taper between the guide section and the deformation section refers to the angle between the cone surface and the vertical center line. If the angle is too small, the sealing cannot be achieved during the extrusion process; if it is too large, it will cause stress concentration and cause the billet to appear. Cracks, so 2...

Embodiment 2

[0032] The design extrusion ratio is 1.5, the extrusion die size is φ10mm, and the process steps are as follows:

[0033] 1. According to the pre-designed extrusion ratio, the processing size of the ZK60 magnesium alloy billet is calculated to be φ12.25mm, and the magnesium alloy billet 6 is turned according to the calculated size. The size of the guide section is φ10mm×6mm, and the transition between the guide section and the deformed section is guaranteed to be a unilateral 20°±0.2° taper to ensure the sealed connection between the billet and the extrusion die.

[0034] 2. Use the sealing ring 7 (φ45×2.5) to seal the extrusion die, then assemble the processed billet 6 with the extrusion die 8, and use grease to seal the joint between the billet 6 and the extrusion die 8 And the lubrication treatment of the deformation section.

[0035] 3. Turn on the press, raise the extrusion cylinder 2, install the assembled billet 6 and extrusion die 8 into the extrusion cylinder 5, then...

Embodiment 3

[0041] The design extrusion ratio is 2.2, the extrusion die size is φ10mm, and the process steps are as follows:

[0042] 1. According to the pre-designed extrusion ratio, the processing size of the ZK60 magnesium alloy billet is calculated to be φ14.83mm, and the magnesium alloy billet 6 is turned according to the calculated size. The size of the guide section is φ10mm×6mm, and the transition between the guide section and the deformed section is guaranteed to be a unilateral 20°±0.2° taper to ensure the sealed connection between the billet and the extrusion die.

[0043] 2. Use the sealing ring 7 (φ45×2.5) to seal the extrusion die, then assemble the processed billet 6 with the extrusion die 8, and use grease to seal the joint between the billet 6 and the extrusion die 8 And the lubrication treatment of the deformation section.

[0044] 3. Turn on the press, raise the extrusion cylinder 2, install the assembled billet 6 and extrusion die 8 into the extrusion cylinder 5, then...

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Abstract

The invention provides a deformation strength technology to a magnesium alloy through hydrostatic extrusion at a room temperature, which relates to the nonferrous metal plasticity mold technology. Themagnesium alloy blank is machined according to the preliminary design extrusion ratio; the blank is arranged in an extrusion die and is treated in seal by a seal ring; the blank and the extrusion dieare arranged in an extruding container of an extruder and are fixed; the head of the extrusion stem of the extruder is sealed by the seal ring, and the extruding container is filled with hydraulic oil; the extruder is started at the room temperature, and a pressure push extrusion stem is selected to carry out the magnesium alloy blank hydrostatic extrusion; the die is removed and the magnesium alloy product is gained after deformation. The material deformation of the invention is always under high three-dimensional compressive stress state, and the plasticity of the material is increased withthe increase of the compressive stress, therefore, the invention is suitable for the brittle and few slip system magnesium alloy room temperature deformation strength. The blank doesn't contact the extruding container wall, is free from friction and is of smaller hot mechanical extrusion pressure than that of the usual condition. The blank and the extrusion die are of hydrodynamic lubrication condition, thus the friction force is small, the service life of the die is long, the performance of the materials mechanics is even, and the surface of the product has high smooth finish.

Description

technical field [0001] The invention relates to the technical field of plastic forming of non-ferrous metals, in particular to a magnesium alloy hydrostatic extrusion deformation strengthening process at room temperature. Background technique [0002] In recent years, the development of the aerospace industry and the automobile industry have put forward higher requirements on how to reduce the weight, energy saving and environmental protection of their parts, which has promoted the large-scale development and application of magnesium alloys in the above two fields. Due to the poor plastic deformation ability of magnesium and its alloys, the production process is difficult, the processing cost is too high, and it lacks cost-effective advantages compared with aluminum alloys, which seriously restricts the expansion of its market application and greatly limits the development of deformed magnesium alloys. . Magnesium alloy parts in the prior art are mainly produced by casting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06B21C23/01
Inventor 王荣杨波朱秀荣钱学梅齐霖徐永东费良军赵国田张广明
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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