Preparation method of high-quality large diameter extremely thin-walled seamless titanium tube

Abstract

The invention discloses a preparation method of a high-quality large diameter extremely thin-walled seamless titanium tube. The preparation method comprises the steps that a titanium tube is subjectedto multi-pass spinning by a vertical ball spinning machine to obtain the seamless titanium tube. The external diameter of the seamless titanium tube is 100mm-300mm, the ratio of wall thickness and the external diameter is not more than 0.001, the dimensional tolerance of the external diameter is +/-0.02mm, the tolerance of the wall thickness is +/-0.01mm, the straightness accuracy is less than 0.5mm/m, and the internal and external surface roughness of the seamless titanium tube Ra is less than 0.2[mu]m. According to the preparation method of the high-quality large diameter extremely thin-walled seamless titanium tube, by controlling the deviation of the external diameter of a core rod of the vertical ball spinning machine and the internal diameter of a spinning tube blank, and accordingto the thickness of the spinning tube blank, a ball bite angle is designed reasonably, then multi-pass spinning is carried out by controlling the thinning ratio and feed rate in the spinning process,dimensional accuracy and surface quality of the seamless titanium tube are improved, the seamless titanium tube with good surface quality, high dimensional accuracy and good plasticity is obtained, and the preparation method is suitable for the production of the various extremely thin-walled seamless titanium tubes with the cold spinning deformability.

Description

technical field [0001] The invention belongs to the technical field of preparation of titanium and titanium alloy pipes, and in particular relates to a preparation method of high-quality large-diameter and extremely thin-walled seamless titanium pipes. Background technique [0002] With the rapid development of my country's aerospace, aviation, ships, nuclear industry and other fields, metal corrugated metal corrugated Pipes are also developing in the direction of large diameter, light weight, high strength, corrosion resistance and durability. Due to the advantages of high specific strength, good corrosion resistance, small linear expansion coefficient, and stable elasticity, titanium and titanium alloy thin-walled pipes are good raw materials for replacing steel pipes in the production of corrugated pipes and elastic components in various industrial fields. However, titanium alloys have high cold deformation resistance, severe springback, and high difficulty in cold proces...

AI Technical Summary

Problems solved by technology

At present, the production process of large-diameter thin-walled seamless pipes of stainless steel and high-temperature alloys has been obtained in China, but the processing technology and products of large-diameter seamless pipes of HCP structural metals have not been reported at home and abroad.

[0004] At present, although the peeling and spinning preparation method of ultra-thin-walled seamless titanium pipes with an outer diameter of less than 80mm and a wall thickness of less than 0.3mm has been developed in China (the patent authorization announcement number is CN 102962294B), the amount of peeling loss during the processing is as high as More than 60%, the material utilization rate is extremely low

Based on the ever-increasing pipe size requirements of various components in various industries, especially thin-walled titanium and titanium alloy pipes with an outer diameter greater than 80mm and a wall thickness less than 0.2mm, there is no existing process that can be used for reference. If the above-mentioned patents are adopted The peeling and spinning method will produce up to 80% of the peeling loss, and the yield is too low

The Chinese invention patent (authorized notification number is CN104708269B) discloses a processing method for large-diameter ultra-thin-wall pipes made of hard-to-deform materials. The diameter of 300mm-1000mm, wall thickness of 0.1mm-1mm, Nickel-based alloy pipes with a ratio greater than 1000, but this method has many heat treatment passes, many deformation passes between fires, long process flow, and low production efficiency; although claim 2 of the invention shows that this method is also applicable to titanium alloys , but subsequently did not cite any examples of using this method to prepare titanium alloy pipes, and did not make process adjustments for the characteristics of metals with a hexagonal close-packed structure, which are difficult to cold, easy to stick to molds, high defect sensitivity, and narrow vacuum heat treatment window. And it shows that this method cannot obtain high-precision and excellent surface roughness pipes by thermal processing, and is not suitable for preparing large-diameter and extremely thin-walled titanium and titanium alloy pipes

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