A preparation method for large deformation composite extrusion of magnesium alloy profile for vertical hydraulic press

Abstract

The invention discloses a large-deformation composite extrusion preparation method of magnesium alloy profiles for vertical hydraulic presses, including (1) blanking, (2) homogenization treatment, (3) heating and heat preservation of blanks and molds, (4) applying lubricant, and putting the blanks into forward extrusion Cavity, ⑤ Forward extrusion of the billet, the billet is extruded into the storage cavity through the sizing belt, ⑥ The billet continues to flow under pressure until it touches the bottom of the storage cavity, the billet flows radially, and gradually the storage The space in the material cavity is completely filled, and the billet is upset and deformed during this process. ⑦Under the downward pressure of the punch, the metal of the billet begins to flow to the extrusion port of the lateral cavity that communicates with both sides of the storage cavity, and sideways deformation occurs. Lateral extrusion deformation, when the punch stroke ends, the lateral extrusion process also ends, ⑧ demoulding. This case realizes forward extrusion-upsetting-lateral extrusion large plastic deformation forming at one time, increases the strain, enriches the stress-strain state, improves the structure and weakens the texture strength, effectively reduces the production process, and adapts to the prospect of my country's market economy.

Description

technical field [0001] The invention belongs to the technical field of plastic processing and forming of metal materials, in particular to a large-deformation composite extrusion preparation method of a magnesium alloy profile for a vertical hydraulic machine. Background technique [0002] Magnesium alloy is the lightest structural material in engineering applications. It has high specific strength and specific stiffness. However, magnesium alloy has less room temperature slip system and poor high-temperature mechanical properties, which limit its wider application in the engineering field. By plastically deforming magnesium alloys (such as extrusion, upsetting, rolling, etc.), the grains of the structure can be refined, and the mechanical properties at room temperature and high temperature can be significantly improved. Magnesium alloy profiles are widely used and in great demand. At present, the main method for forming magnesium alloy profiles is forward extrusion. The ou...

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Problems solved by technology

The outflow direction of the profile in forward extrusion is the same as the extrusion axis, which has the advantages of simple operation, high production flexibility, and large cross-sectional span of the extrusion, but it also has disadvantages. On the one hand, the profile is subjected to The frictional resistance is large, and the metal flow is uneven, resulting in a large difference in the performance of the head and tail of the extruded parts, and the magnesium alloy profiles obtained by purely forward extrusion are less plastic deformation and have a single stress-strain mode. This leads to coarse grains and poor comprehensive mechanical properties; on the other hand, in the existing production of magnesium alloy profiles, profiles with large axial dimensions are often realized by using horizontal hydraulic presses, while vertical hydraulic presses in my country Occupancy far exceeds that of horizontal hydraulic presses, so most of the actual production conditions in my country are still dominated by vertical hydraulic presses. In order to adapt to the actual production conditions of our country, and on this basis, focus on strengthening the mechanical properties of magnesium alloys, the applicant Specially proposed a large-deformation composite extrusion preparation technology for high-strength and tough magnesium alloy profiles applied to vertical hydraulic presses

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