LEAD SCREW, MOLDING THEREOF AND METHOD AND MOLD FOR INTEGRAL MOLDING WITH ROTOR

摘要

PURPOSE: To save the labor in integral molding and to inexpensively produce a product excellent in accuracy, in a lead screw molding method of injecting a resin material into a metal pipe, by injecting the resin material into the pipe from the outer peripheral parts of the predetermined hole parts provided to the pipe. CONSTITUTION: After the upper end part of a pipe 2 is positioned, a resin material is injected into the pipe 2 through the gate positioned at the upper end opening part of the cavity provided to the outer peripheral part of the pipe 2 to be allowed to flow in the direction of a cavity a1 . Subsequently, the resin material is allowed to continuously flow in the spriral groove 4a of the cavity a1 and further filled into the empty core part 10 of the pipe 2 from the hole parts 5 provided to the wall part 3 of the pipe 2. Whereupon, the resin material of the empty core part 10, the screw thread part 4 mounted on the outer peripheral part of the pipe 2 and the resin material of the cover part on the other side of the pipe 2 having no screw thread part 4 are connected in a mutually sewn state and a lead screw having the pipe made of a metal arranged therein and having the screw thread part 4 formed thereto can be produced.