Tantalum alloy shaped parts are prepared by the combination of hot stamping method and spinning method. First, the shape of tantalum alloy sheet is changed by hot stamping method, so that the shaped parts of tantalum alloy are initially formed, and the semi-finished tantalum alloy shaped parts are obtained, which reduces the influence of the anisotropy of the internal structure of tantalum alloy sheet and avoids the phenomenon of lug forming caused by direct stamping. The inner surface of the semi-finished tantalum alloy shaped part can be fully fitted with the spinning die during the spinning process, so as to ensure that the inner surface and outer surface of the spinning can be thinned evenly, and will not be folded or cracked by accumulation, which effectively controls the size and shape of the product and improves the yield of the tantalum alloy shaped part. Reduced production costs.
The hot spinning process is used to improve the spinning ability of semi-finished tantalum alloy shaped parts, prevent the defects such as fish scale burr or peeling during the spinning process, and remove the burr and burr in combination with cutting and machining technology, improve the dimensional accuracy of the product, reduce the surface roughness of the product, and improve the surface quality of the tantalum alloy shaped parts. The forming method is simple and easy to operate, has low requirements on equipment, and is easy to be popularized. It is suitable for processing the deformed tantalum alloy products with complex shape and large depth.
The semi-finished Ta-10W shaped parts were placed on a spinning machine for hot spinning, lubricated by graphite mechanical oil mixture, heated by spray gun, measured by handheld infrared thermometer, and thinned by 5 times of stretching and hot spinning to obtain the flared Ta-10W shaped parts blank. During the hot spinning process of the 5 stretches thinning, the temperature of the controlled hot spinning is gradually reduced from 900℃ to 650℃; In the process of hot spinning, the radius of the spinning wheel is 15mm, the feed speed of the spinning wheel is 0.4mm/r, and the speed of the semi-finished Ta-10W shaped part is 150r/min. The bottom outer diameter of the flared Ta-10W shaped part blank is 80mm, the bottom thickness is 12.1mm, the wall thickness from the flared bottom to the mouth is reduced from 9.4mm to 5.8mm, and the outer diameter of the mouth is 230mm.
