Continuous extrusion machining device used for magnesium alloy sheet strip with weak basal texture and extrusion machining method

Abstract

The invention relates to a continuous extrusion machining device used for a magnesium alloy sheet strip with a weak basal texture and an extrusion machining method. The device comprises an extrusion system mainly composed of a pressure motor, an extrusion telescopic head, a male die and a female die, and multiple inclined steps gradually getting close to the axis of a die cavity are arranged at the two sides below the upper middle portion in the die cavity of the female die and are distributed asymmetrically. In the extrusion machining process, a magnesium alloy blank is placed in the die cavity of the female die and extruded by the descending male die, and as the male die descends continuously, the magnesium alloy blank is gradually thinned to form a magnesium alloy sheet with the weak basal texture. Due to step-by-step grain refinement and basal texture weakening, extrusion force in the extrusion process is greatly reduced, the average grain size of the magnesium alloy is greatly reduced compared with that of a magnesium alloy extruded normally, and the (0002) basal texture is reduced to 8.2 from 27.6 compared with that of a sheet obtained through normal extrusion.

Description

technical field [0001] The invention relates to a continuous extrusion processing method for enhancing the performance of magnesium alloy plates, in particular to a continuous extrusion processing device for magnesium alloy sheet strips with weak base surface texture and a continuous extrusion method through the device. Background technique [0002] Magnesium alloy, as the lightest metal structure material currently used, is widely used in aerospace, 3C, etc. It is widely favored in the fields of electronic products, transportation and national defense, and is known as "the green energy material of the 21st century". However, due to its unique hexagonal close-packed structure, only 2 independent slip systems are activated at room temperature, which cannot meet the requirements of 5 independent slip systems required for plastic deformation, so it shows poor room temperature mechanical properties and formability . At the same time, the unique structural characteristics of ma...

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Problems solved by technology

For example, the addition of alloying elements is generally rare earth elements, which are expensive and prone to casting defects such as pores and shrinkage porosity during the smelting process; although severe plastic deformation avoids casting defects, the actual operation is often complicated, and at the same time, thin plates such as 1mm thick The pressure is often too high when the sheet is extruded, and the tonnage of the equipment is strictly required, and it is difficult to realize continuous deformation during the deformation process, and it is difficult to realize industrial production

The technical defects and drawbacks of these methods limit the scope of application of reinforced magnesium alloys to a certain extent.

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