Amorphous metal extrusion die capable of rapidly replacing die core, and extrusion process thereof

Abstract

The invention relates to an amorphous metal extrusion die capable of rapidly replacing a die core, and an extrusion process of the amorphous metal extrusion die. The amorphous metal extrusion die comprises a general standard framework and the split type combination die core, wherein the general standard framework comprises an upper die base and a lower die base; guide pillars and guide sleeves, which can move up and down after being matched with each other, are supported between the upper die base and the lower die base; a dowel bar is fixed on the upper die base by a dowel bar fixing plate; the lower end of the dowel bar is provided with a press head; a fixed seat is arranged on the lower die base; an ejector rod communicated with the bottom of the fixed seat is arranged under the lower die base; the split type combination die core is arranged on the fixed seat and is formed by splicing at least two die core blocks; the jointing surface of the die core blocks is arranged along the vertical direction; after the die core blocks are spliced, grooves in the inner surfaces of the die core blocks can form a die core cavity needed by a cylindrical bulge. The amorphous metal extrusion die is capable of rapidly replacing the die core and guaranteeing the formation accuracy and the surface quality of an amorphous alloy part, can prevent surface oxidation of the amorphous alloy part, is high in production efficiency, has energy-saving and consumption-reducing effects and can avoid crystallization of the amorphous alloy part.

Description

technical field [0001] The invention relates to an extrusion forming process and a mold for amorphous metallic glass, and belongs to the technical field of amorphous metal forming. Background technique [0002] Metallic glass, also known as amorphous alloy, has both the advantages of metal and glass and overcomes their respective disadvantages due to their unique disordered microstructure. Glass is fragile and has no ductility; however, the strength of metallic glass is higher than that of steel, its hardness is higher than that of high-hard tool steel, and it has certain toughness and rigidity. "The King of Glass". Amorphous alloys have good mechanical, physical and chemical properties such as high strength, high hardness, good wear resistance and corrosion resistance, which determine their wide application fields and broad application prospects. [0003] Zirconium-based amorphous has lower requirements for the ultimate cooling rate, and a complete amorphous structure can...

AI Technical Summary

Problems solved by technology

[0004] After the amorphous alloy is formed in the mold, there are two problems: one is that if the part is directly ejected through the ejection system of the mold after forming, since the part is still in a supercooled liquid state after forming, the ejected part is easy to cause damage to the part, such as : Top wear, deformation, cracking, etc.; Second, if the formed parts are air-cooled in the mold with the mold after forming, it will take a long cooling time, which will easily lead to partial crystallization of the formed parts, and it is impossible to obtain a complete amorphous alloy parts, and the production efficiency is also very low

If no protective measures are taken, the surface of the blank and parts of the amorphous alloy will be oxidized, which will affect the surface appearance quality of the parts and also affect the forming accuracy of the parts

If a vacuum furnace is used to wrap the forming tooling inside, there are mainly the following problems: (1) Since the vacuum furnace is relatively large, and every time a part is formed, it must be vacuumed and filled with a protective atmosphere, so the production efficiency is low. The loss of atmosphere is also large

(2) During the forming process, the tooling must exceed the glass transition temperature of the amorphous alloy and be lower than the crystallization temperature of the amorphous alloy, so that the smooth forming of the amorphous alloy blank can be ensured; however, through The resistance heating method of the vacuum furnace heats the entire tooling, and the temperature of the tooling is not easy to control

(3) When the parts are ejected, the amorphous alloy blank is still in the supercooled liquid state after forming, and the strength is not high. If it is directly ejected, it will cause damage to the surface of the amorphous alloy parts

(4) After the amorphous alloy part is ejected, it must be taken out and cooled rapidly, otherwise it will lead to crystallization of the amorphous alloy part, resulting in failure of the forming process

(5) After the parts are taken out of the vacuum furnace, the amorphous alloy parts in the high temperature state will be in contact with the air, which will cause the surface of the amorphous alloy parts to be oxidized, seriously affecting the surface quality of the amorphous alloy parts

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