Reciprocating extrusion machining method for preparing ultrafine grain magnesium alloy pipe
A magnesium alloy tube and reciprocating extrusion technology is applied in the field of non-ferrous metal plastic processing and enhanced mechanical properties, which can solve problems such as the inability to meet the needs of ultra-fine-grained magnesium alloy tubes, and achieve improved mechanical properties, simple process, and wide application prospects. Effect
Active Publication Date: 2017-09-08
TAIYUAN UNIV OF TECH
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Problems solved by technology
At present, common severe plastic deformation techniques include equal-diameter angular extrusion, high-pressure torsion, cumulative stack rolling, etc. Through these techniques, metal materials with fine grain structure can be obtained, which has important application value. However, these techniques still have technical limitations. defects and disadvantages, and these technologies can only prepare bulk materials, which cannot meet the increasing demand for ultra-fine-grained magnesium alloy tubes
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Embodiment Construction
[0046] A reciprocating back-extrusion processing method for preparing ultra-fine-grained magnesium alloy pipes comprises the following steps:
[0047] (1) Selected materials and chemical reagents
[0048] Select the materials and chemical reagents used, and carry out quality purity control:
[0049] Magnesium alloy tube blank: solid solid, with a magnesium content of 90% or more;
[0050] Absolute ethanol: liquid liquid, 99.7%;
[0051] Acetone: liquid liquid, 99.0%;
[0052] Sandpaper: solid solid;
[0053] High temperature graphite: solid powder.
[0054] (2) Pretreatment of magnesium alloy tube blanks
[0055] ① Use 500-mesh sandpaper to polish the inner and outer surfaces of the magnesium alloy tube blank 24 to remove oil stains, oxide layers, etc., and then use 1500-mesh sandpaper to polish the inner and outer surfaces of the tube blank to make the inner and outer surfaces clean and smooth;
[0056] ② Weigh the absolute ethanol solution and acetone solution with a v...
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Abstract
The invention relates to a reciprocating extrusion machining method for preparing an ultrafine grain magnesium alloy pipe, and belongs to the technical fields of plastic machining of nonferrous metal and improvement of the mechanical performances. Aiming at the condition that a traditional ultrafine grain magnesium alloy preparation technology can only be used for preparing a block material, so that the increasing demand on the ultrafine grain magnesium alloy pipe cannot be satisfied, a magnesium alloy pipe is extruded back and forth in a molding cavity of a mold on a horizontal hydraulic reciprocating extrusion machine in a heating state; the inner diameter and the outer diameter of the magnesium alloy pipe in the reciprocating extrusion process are changed to generate continuous uniform-section corner deformation; and through continuous reciprocating extrusion accumulated deformation, the magnesium alloy pipe is acutely and plastically deformed, so that the grain structure is fine and compact, the ultrafine magnesium alloy pipe with improved mechanical performance is obtained, and the application range and the application field of a magnesium alloy are widened.
Description
technical field [0001] The invention relates to a reciprocating extrusion processing method for preparing ultrafine-grained magnesium alloy pipes, and belongs to the technical field of plastic processing and enhanced mechanical properties of nonferrous metals. Background technique [0002] The density of magnesium is 1.74g / cm 3 , only 2 / 3 of aluminum and 1 / 4 of steel, it is currently the lightest metal structure material, and the magnesium alloy made of it has the advantages of low density, high specific strength, and good electromagnetic shielding performance. Magnesium and magnesium alloys are It is recognized by the world as the green engineering metal material with the most development potential, and it has broad application prospects in aerospace, automobile industry, electronics industry and other fields. However, the low strength and poor corrosion resistance of magnesium limit the wide application of magnesium and magnesium alloys to a large extent. [0003] In ord...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B21C23/08B21C23/00
CPCB21C23/001B21C23/085
Inventor 张华王利飞侯忞健樊建锋董洪标许并社
Owner TAIYUAN UNIV OF TECH