Ball hot spinning forming device and method for nickel titanium shape memory alloy thin-walled pipe

Abstract

The invention provides a ball hot spinning forming device and a ball hot spinning forming method for a nickel titanium shape memory alloy thin-walled pipe. The device comprises a spinning head and a core mold; the spinning head comprises a knob, balls, a mold ring, a spring, a retainer, a support and a shell; the inner surface of the knob is in threaded connection with the support; the mold ring is sleeved on the support; the balls are uniformly distributed on the circumference of a conical groove consisting of the knob and the mold ring; the retainer is in clearance fit with the mold ring; the right side of the retainer is pressed toward one side of the balls by the spring; the outer surface of the support is in fit with the inner surface of the shell; the core mold comprises a core shaft; and the core shaft is provided with a pipe billet positioning mechanism. The spinning head is clamped on a main shaft of an engine lathe, the blank of the nickel titanium shape memory alloy pipe is arranged on the core shaft, the core mold with the blank is arranged on the tail top of the lathe, and then hot spinning forming is performed. The method is an ideal process for manufacturing a thin-walled pipe with a small diameter, and parts obtained through spinning have a high mechanical property, size accuracy and surface finishment.

Description

technical field [0001] The invention relates to a plastic forming device for a nickel-titanium shape memory alloy thin-walled tube, and also relates to a plastic forming method for a nickel-titanium shape memory alloy thin-walled tube. Specifically, it is a biomedical nickel-titanium shape memory alloy thin-walled tube ball thermal spinning forming device and forming method. Background technique [0002] Nickel-titanium shape memory alloy has been widely used in the field of biomedicine because of its shape memory effect, superelasticity, good biocompatibility, mechanical compatibility and corrosion resistance. Since the appearance of nickel-titanium shape memory alloy tubes in the 1990s, people have paid more and more attention to them in the field of medical applications, especially in the application of interventional endoluminal stents, because they can withstand greater mechanical stress and have stronger diameters. It exhibits good application prospects because of its...

AI Technical Summary

Problems solved by technology

For the nickel-titanium shape memory alloy tubes used in biomedical interventional endoluminal stents, the wall thickness is generally several hundred microns, and the drawing process is generally used for plastic processing. Due to the existence of tensile stress during the drawing process, the tubes often break, which is not conducive to Manufacture of high-precision extremely thin-walled nickel-titanium shape memory tubes

Images