Rare earth magnesium alloy extrusion method

Abstract

The invention provides a rare earth magnesium alloy extrusion die and an extrusion method. A blank is deformed by pure cutting to realize equal channel angular pressing (ECAP), the original aim is to introduce intensified plastic deformation while the cross section area of a sample is not changed. Currently, an existing ECAP mostly adopts two half-dies, and the outer surface of a product produced by the die is not smooth and is easily deformed. The die comprises a die base (1), wherein a die casing (2) is arranged on the die base; a die inner core (4) is arranged inside an inner core mounting hole (3) in the die casing; the inner core mounting hole is communicated with a discharge port (5) of the die casing; a die pressure head inner hole (6) is formed in the die inner core; and a die pressure head (7) is arranged inside the die pressure head inner hole. The rare earth magnesium alloy extrusion die and the extrusion method are used for manufacturing a rare earth magnesium alloy part.

Description

[0001] Technical field: [0002] The invention relates to a rare earth magnesium alloy extrusion die and an extrusion method. [0003] Background technique: [0004] Equal channel angular pressing (ECAP) technology has received increasing attention from the material science community as one of the effective methods to obtain large-scale sub-micron or nano-scale bulk materials through strong plastic deformation. Equal Channel Angular Extrusion (ECAP) is realized by pure shear deformation of the blank. It was developed by Segal and his collaborators in the early 1980s. The original purpose was to not change the cross-sectional area of ​​the sample. At the same time, strong plastic deformation is introduced. By the early 1990s, ECAP was further developed and applied as a strong plastic deformation method capable of obtaining ultra-fine grains. Most of the equal-channel corner extrusion molds currently in use use two-half molds. The outer surface of the products made by this type of mo...

AI Technical Summary

Problems solved by technology

Most of the equal-channel angular extrusion dies currently used are two-half dies. The outer surface of the product made by this die is not smooth, easy to deform, and cannot achieve multi-pass repeated extrusion.

During the extrusion process, the alloy is easy to enter the gap of the extrusion die, the diameter of the extruded rod is easy to change, and it is easy to cause dead mold.

Moreover, the mold with two halves often needs to be fixed with bolts. Since the extrusion process is high-temperature extrusion, the fixing bolts must use high-strength, high-temperature-resistant bolts, which increases the manufacturing cost of the mold.

Once the phenomenon of mold expansion occurs, it is extremely inconvenient to disassemble the mold

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