| 摘要 |
PURPOSE:To reduce the generation of frictional heat on a cylinder and a screw for a synthetic resin molding machine and to prevent the buring of resin by coating the ferrite surface of the screw with a specified substance having a low coefft. of friction with metal. CONSTITUTION:Powder of one or more kinds of metallic compounds selected from metallic oxides, carbides, nitrides, borides, silicides and sulfides each having a low coefft. of friction with metal is prepd. The powder is mixed with alloy powder having a lower m.p. than said powder, and the mixture is build-up welded to the ferrite surface of a screw for a synthetic resin molding machine. Said metallic compounds are uniformly dispersed without melting. Thus, the generation of frictional heat on a cylinder and the screw is reduced, and the buring of resin is prevented. |
