The invention discloses a preparation method of a
zirconium ball valve core, which is characterized by comprising the following steps: S1,
smelting to obtain a
zirconium ingot with the specification of phi 600mm; s2, saw
cutting is conducted, and the materials are divided into four equal parts; s3, cogging
forging is conducted, and a rough circle of phi 350 mm is manufactured; s4, sawing again; s5, blank manufacturing and
forging are carried out, and a blank with the height being 330 mm is obtained; s6,
punching is conducted, and an annular blank is obtained; and S7, a finished product is rolled into the blank, an 80KN
broaching machine is used for
broaching, an inner hole and the outer
diameter are continuously rolled to the
forging size, then heat treatment is conducted, finish
machining is completed after heat treatment, and the valve element is obtained. The preparation method of the valve element is suitable for
batch production, the product structure uniformity is stable, the quality is good, the overall strength is high, abrasion is not prone to occurring, raw materials are saved, the regular spherical surface is directly rolled, the
machining amount is small, the
machining time cost is greatly reduced, and the cost is greatly reduced.