Semi-solid forming mold and method of use

Abstract

A semi-solid forming mold and its use method. The mold is composed of a mold base, a mold body, and a sizing mold as a whole, and a cavity is formed in it. The cavity is divided into three sections, and the cavity has an inlet and an outlet; There is a splitter cone in the connecting section between the cavity of the mold base section and the cavity of the mold body section. The splitter cone is composed of the main body of the splitter cone and the smooth head of the splitter cone. The main body of the splitter cone is located in the cavity of the mold body section. Among them, the smooth head of the splitter cone is located in the rear cavity of the cavity of the mold base; the cavity of the sizing mold segment is cylindrical with a taper of 0 to 3°, and the taper is > 0; between the mold base and the mold A heater is installed on the body; a cooling chamber is installed in the sizing die. A core rod may be provided in the cavity of the sizing die section. The semi-solid slurry propulsion device is used to push the semi-solid slurry of magnesium and aluminum alloy into the mold and gradually solidify, finally forming bars and profiles of different specifications. Compared with the traditional hot extrusion method, this method has the characteristics of short processing process, low energy consumption, high efficiency and wide application range.

Description

technical field [0001] The invention relates to a method and a mold structure for preparing magnesium and aluminum alloy rods and profiles by using a semi-solid forming process, and belongs to the field of nonferrous metal preparation and processing. Background technique [0002] At present, the production of magnesium and aluminum alloy bars and profiles mainly adopts hot extrusion process. In this process, magnesium alloy ingots are prepared first, and then the ingots are processed to the required size, and then heated to an appropriate temperature range for extrusion. The extrusion die used can be divided into flat die, cone die, flat cone die, etc. according to the cross-sectional shape of the compression zone of the die hole, and can be divided into single-hole die and multi-hole die according to the number of die holes, and can be divided into integral die and split die according to the die structure. mold, shunt mold, etc. Different mold structures have the same wor...

AI Technical Summary

Problems solved by technology

Since the plastic deformation is carried out in a solid state, a large extrusion force is required, and when the extrusion is relatively large, it is easy to cause a stuffy phenomenon. For profiles with complex structures, it is easy to cause profile kinks and deformations due to uneven deformation.

The extrusion die is prone to deformation under high temperature and high pressure, which affects the life of the die. There is a large friction between the die sizing belt and the extruded material, which will cause coarse crystal rings to appear on the extruded material. In addition, the surface accuracy of the sizing belt is also poor It will decrease and affect the surface quality of the extruded material. Due to the limitation of the size of the extruded barrel, the length of the extruded rods and profiles produced is also limited, and continuous production cannot be performed.

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