A forming method for tantalum alloy profiled parts includes the following steps: Step 1. After polishing the surface of tantalum alloy round plate, hot stamping is performed to obtain semi-finished tantalum alloy profiled parts; Step 2. The semi-finished tantalum alloy profiled parts are cold-spun or hot-spun to get the rough tantalum alloy profiled parts; Step 3: The tantalum alloy profiled parts were cut and machised in turn, and then the tantalum alloy profiled parts were obtained by vacuum annealing. This invention first hot stamping method is used to make the preliminary forming tantalum alloy plate, tantalum alloy profiled semi-finished products, and then the spinning method is adopted to make the inner surface of the tantalum alloy profiled semi-finished products and spinning mould fully fit, so as to ensure inner surface and outer surface thinning even spin, solved the tantalum alloy thick plate in the process of preparation of tantalum alloy profiled stamping difficulty and the problem of difficult to control in spinning size, The yield of tantalum alloy profiled parts and the surface quality of tantalum alloy profiled parts were improved.
Tantalum and tantalum alloy have high density, high melting point, high strength, excellent acid and alkali resistance and liquid metal corrosion resistance, etc. They are widely used in chemical industry, aerospace, weapons and equipment, electronics and other fields. In order to prevent corrosion, tantalum and tantalum alloy are used as the lining of heat exchangers, shells, tubular heaters and thermocouple bushing in chemical equipment, as well as the sealing heads of acid production containers, pipelines, storage tanks and transportation tanks. Tantalum alloys are used as rocket nozzle materials in the aerospace field. In the field of weapons and equipment, tantalum alloy is used as the cover material of armor-piercing ammunition, which greatly improves the armor-piercing power of penetration body. In recent years, with the development of the above fields, the demand for tantalum and tantalum alloy has increased sharply.
When the tantalum alloy sheet is thick, the phenomenon of ear forming in the stamping process is serious, the product forming is difficult, and the rejection rate is high, resulting in great waste of materials, especially for tantalum, a costly metal, which greatly increases the cost of raw materials. And spinning method using tantalum alloy thick plate preparation of tantalum alloy profiled, wheel pressure is difficult to accurately passed to the inner surface of the spinning pieces, causing the outer surface of the spinning pieces have been thinned and still stick on the inner surface mould problem, make the products size is difficult to control, especially in processing complicated shape and the depth of the larger products, direct spinning susceptible to cracking phenomenon. Therefore, the yield of tantalum alloy special-shaped parts prepared from tantalum alloy plate by stamping or spinning alone is low.
