A kind of preparation method of medical titanium alloy rod for manufacturing pedicle screw

Abstract

The invention discloses a method for preparing medical titanium alloy bars for manufacturing pedicle screws. The method includes steps of scaling, surface treatment, temperature-control drawing, cutting-off, high-temperature annealing, hyperbolic-line cold straightening, stress relief annealing and polishing. The method has the advantages that the medical titanium alloy bars are prepared in temperature-control drawing, full annealing, cold straightening and stress relieve treatment combined technological modes, in other words, final products can be obtained from hot-rolling materials by the aid of temperature-control drawing forming and stress relief treatment technologies, and the hot-rolling materials are used as blanks; materials are subjected to machining hardening owing to crystal grain deformation and dislocation pile-up in bar temperature-control drawing deformation procedures as compared with traditional hot-rolling and hot drawing technologies and the like, and accordingly the strength of the materials can be improved; the plasticity can be enhanced by means of appropriate high-temperature heat treatment, the strength cam be maintained at a high level, and accordingly the mechanical performance of the materials can be improved; necking of U-shaped notches of the pedicle screws is lower than 0.05 mm and is stable after the medical titanium alloy bars are used for manufacturing the pedicle screws.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a method for preparing medical Ti-6Al-4V and Ti-6Al-4V ELI alloy rods used for manufacturing pedicle screws. Background technique [0002] Titanium and titanium alloys have the advantages of high human compatibility, low density, low elastic modulus, corrosion resistance to body fluids, and excellent mechanical properties, and are widely used in surgical orthopedic operations. Titanium alloy rods, plates, and wires are mainly used to manufacture connecting rods, bone plates, and bone nails for surgical trauma and spinal repair, and are implanted in the human body as force-bearing devices. Due to its low mechanical failure and good biocompatibility, titanium alloy has become an ideal material for manufacturing pedicle screws. At present, the material of domestic and foreign spinal pedicle screws is mainly made of Ti-6Al-4V or Ti-6Al-4VELI alloy rods, among which ...

AI Technical Summary

Problems solved by technology

However, the rods required for the pedicle screws obtained by this method will generate new stress after vertical straightening, and will cause changes in dimensional accuracy, especially poor operability and low production efficiency in mass production

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