Tool for turning inner ball of titanium alloy part

The utility model provides a tool for turning an inner ball of a titanium alloy part, and aims to solve the problems that in the prior art, when the inner ball of the titanium alloy part is machined on a numerical control lathe, due to the fact that the diameter of the inner ball is small, a cutter can not completely reach the inner spherical surface needing to be machined, and numerical control equipment can not be used for directly machining and forming the inner ball of the titanium alloy part. The large supporting plate is connected with a lathe; the mounting piece is mounted at the top of the tool apron; the cutter head is mounted at one end of the top of the mounting part and is used for mounting an inner ball turning cutter; the cutter driving device is mounted at the top of the mounting part, is opposite to the cutter head and is used for driving the cutter head to move; the protection device is arranged on the outer side of the cutter driving device and used for protecting the cutter driving device;