A kind of production method of magnesium alloy hollow lag screw

Abstract

The invention discloses a production method of a magnesium alloy hollow lag screw in the field of screw processing, in order to improve the physical properties of the screw. In order to achieve the above purpose, the technical proposal casts the magnesium alloy into a bar and conducts the guide hole operation, and then thins the screw. To measure the thickness of the bar in the middle, put the head structure and rod structure of the bar upside down into the mold, and then run through the filler rod that gradually expands toward the head structure along the guide hole to repeatedly squeeze the channel corner, and then shape the fine embryo screw The wire rolling operation is carried out to form the magnesium alloy hollow lag screw. Due to the cold extrusion process and the use of a mold with equal channel corners, the grains inside the magnesium alloy are refined to improve ductility and the hardness of the magnesium alloy is enhanced.

Description

technical field [0001] The invention belongs to the field of screw processing, in particular to a production method of a magnesium alloy hollow lag screw. Background technique [0002] The fixation of existing fractures mainly fixes the fracture site by instruments such as bone circular pins, ordinary screws, and hollow screws. Existing fracture fixation devices are fixed in a straight line during fracture surgery. When reducing irregular bone fractures, especially in pelvic fractures, such as: fractures of the upper and lower ramus of the pubic bone, the existing fracture fixation devices cannot bend in the direction of fracture connection , resulting in difficulties in the fixation of fracture reduction. [0003] In order to solve the above problems, the technical solution of the prior art CN210095889U provides a universal elastic hollow lag screw. The difficulty in manufacturing this screw is that the middle part needs to be bent while maintaining a certain rigidity to m...

AI Technical Summary

Problems solved by technology

[0004] However, during the molding process of the flow forming process, internal stress often remains inside the molded part, and this stress will also cause the deformation of the part. At the same time, the screw material often contains air bubbles in the flow state, which affects the physical properties of the screw.

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