Method for preparing equal-channel reciprocating extrusion magnesium alloy with back pressure and extrusion die thereof
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A technology of reciprocating extrusion and extrusion dies, applied in metal extrusion dies, metal extrusion control equipment, metal extrusion, etc., can solve problems such as crushing, cracking, and inability to carry out extrusion deformation, and achieve increased density , avoid cracking, improve the effect of internal tissue morphology
Inactive Publication Date: 2009-12-02
NO 52 INST OF CHINA NORTH IND GRP CORP
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However, the disadvantage of using ECAP for extrusion is that due to the strong shear strain that occurs during the extrusion process, the sample cracks and breaks along the direction of the shear stress, which eventually makes further extrusion deformation impossible.
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Embodiment 1
[0027] The technical scheme of the present invention will be described in detail below by taking the back-pressure equal-channel reciprocating extrusion of No. 2 deformed magnesium alloy (MB2) as an example.
[0028] ① First, the MB2 alloy sample is processed into an extrusion sample with a size of 19.5mm×19.5mm×100mm.
[0029] ② Debug the three-way extrusion hydraulic press to ensure that each cylinder works normally.
[0030] ③ press figure 1 As shown, the mold base plate 3 is fixed on the workbench of the three-way extrusion hydraulic press, and the circular through hole 32 on the base plate 3 is aligned with the working hole on the press workbench.
[0031] ④ Put the right baffle 2 into the baffle groove 31 of the bottom plate 3, the mold main body 1 is placed on the bottom plate 3 close to the right baffle 2, and the lower extrusion rod 8 is placed on the bottom along the vertical extrusion groove of the mold main body 1. On the cylinder column, adjust the height of th...
Embodiment 2
[0039] Low-temperature synthesis preparation process of Mg-6Al-5Zn material.
[0040] ① First, according to the composition requirements, 150 purpose pure magnesium powder, 200 purpose pure aluminum powder and 150 purpose pure zinc powder are proportioned by weight percentage: 6% aluminum, 5% zinc, and the balance is magnesium.
[0041] ② Process the prepared material into an extrusion sample with a size of 19.5mm×19.5mm×100mm by means of cold isostatic pressing and cutting.
[0042] ③ Debug the three-way extrusion hydraulic press to ensure that each cylinder works normally.
[0043] ④ Press figure 1 As shown, the mold base plate 3 is fixed on the workbench of the three-way extrusion hydraulic press, and the circular through hole 32 on the base plate 3 is aligned with the working hole on the press workbench.
[0044] ⑤ Put the right baffle 2 into the baffle groove 31 of the bottom plate 3, the mold main body 1 is placed on the bottom plate 3 close to the right baffle 2, and...
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Abstract
The invention relates to a method for preparing an equal-channel reciprocating extrusion magnesium alloy with back pressure and an extrusion die thereof. The preparation method uses a three-way extrusion hydraulic press; and a pressurizing mode comprises that a side extrusion rod and a lower extrusion rod are used as a main pressure and a back pressure by adopting a right cylinder and a bottom cylinder to extrude a sample according to the set pressure and speed; after the side extrusion rod reaches a left limit or the lower extrusion rod reaches an upper limit, the pressure of the right cylinder and the bottom cylinder is changed, the main pressure is changed into the back pressure, the back pressure is changed into the main pressure, and the sample is taken out after repeated reciprocating extrusion. The extrusion die consists of a die main body, a right baffle plate, a bottom plate, a left baffle plate, an upper cover plate, the side extrusion rod, the lower extrusion rod, and the like; and the extrusion die is characterized in that the die main body is provided with a right-angled extrusion groove which is bent with equal section. Because the extrusion direction of the sample adopts the back pressure and the extrusion deformation temperature is reduced at the same time, the performance and quality of the magnesium alloy sample are effectively improved. The preparation method and the extrusion die also can be used for mixing aluminum alloy and magnesium alloy powder into block materials at low temperature.
Description
technical field [0001] The invention relates to a preparation method of an equal-channel reciprocating extrusion magnesium alloy with back pressure and an extrusion mold thereof. Background technique [0002] Magnesium alloy has good electrical conductivity, thermal conductivity, electromagnetic shielding, high specific strength and specific stiffness, good shock absorption, easy cutting and high dimensional stability, easy recycling, and environmental protection. It is known as the "21st century "Green engineering materials" have been applied in aerospace, national defense industry, transportation, electronic device housing, sports equipment and office supplies and other fields. [0003] With the continuous expansion and deepening of the application of magnesium alloy materials, the requirements for the mechanical properties of magnesium alloy materials are getting higher and higher. At this stage, the mechanical properties of wrought magnesium alloys in my country are gen...
Claims
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