Preparation technique for medical titanium alloy small-diameter thick-wall pipe

Abstract

The invention relates to the field of material preparation, in particular to a preparation technique for a medical titanium alloy small-diameter thick-wall pipe. The preparation technique comprises the following steps that (A) a super-low-gap medical titanium alloy circle-forming bar is prepared, and a super-low-gap titanium alloy pipe blank is formed through skew rolling; (B) the super-low-gap titanium alloy pipe blank is heated and then rolled into a thick-wall pipe blank through a tungsten alloy planetary rolling mill; (C) the thick-wall pipe blank is heated, and a heat-resistance rod serves as a core rod and is inserted in an inner hole of the thick-wall pipe blank and placed in a rotary swaging machine to subjected to rotary swaging to form a small-diameter pipe, wherein a low melting point material is hot-plated on the outer layer of the heat-resistance rod; and (D) the small-diameter pipe and the core rod are heated till the temperature reaches the melting temperature of the low melting point material, and through a core-pulling machine, the heat-resistance rod serving as the core rod is pulled out. Compared with the prior art, the preparation technique for the medical titanium alloy small-diameter thick-wall pipe is simple and high in production efficiency, and the cast ingot specification and the titanium alloy material are wide in adaptation range.

Description

【Technical field】 [0001] The invention relates to the field of material preparation, in particular to a preparation process of a medical titanium alloy small-diameter thick-walled tube. 【Background technique】 [0002] In recent years, titanium alloys have been more and more widely used in the biomedical field. The compound growth rate of the global orthopedic implant devices and implant materials market in the past five years is about 10.4%. In 2015, it has reached 27.7 billion US dollars. The market has reached 16.6 billion yuan, with a compound annual growth rate of 18.1%. The Chinese market has become the focus of the world. It has become the second largest market country in the world in terms of the number of operations, the number of products, and the market value of products. The demand for high-quality medical devices Demand is steadily increasing. [0003] Biomaterials currently used in bone repair are not only required to replace damaged tissues, but also have good...

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Problems solved by technology

[0005] Because the inner hole of the hollow bone screw is very small, the processing technology of short solid titanium alloy bar is mainly used in China, and then the external thread is turned. Due to the high viscosity of titanium alloy, when drilling with a small diameter drill, it is often Drilling is off-center, resulting in waste products, low processing yield, and large-scale industrial production cannot be realized

In foreign countries, thick-walled titanium alloy pipes of about 3m are directly prepared, with good concentricity, and directly enter the machining center to turn titanium alloy bone nails, so the yield and processing efficiency are very high. However, due to the technical blockade of foreign countries, my country is currently unable to manufacture The thick-walled titanium alloy pipe with a length of 3m makes foreign thick-walled titanium alloy pipes expensive, and the domestic bone nails cannot be produced efficiently, which eventually makes the bone nails remain high, causing a heavy medical burden on surgical patients in our country