| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball bearing cage for roll bearing which is free of void and excellent in dimensional accuracy and is provided at low costs without the need of an additional mechanism dedicated for compression or pocket deburring work.SOLUTION: A method of producing a ball bearing cage for rolling bearing uses a molding die which is arranged with a cavity equal in shape to a ball bearing cage, a resin reservoir provided outside a column part-corresponding part so as to be connected with an appropriate part of the column part-corresponding part of the cavity, a cavity connected to the resin reservoir and a movable pin sliding in the cavity. After filling the cavity, resin reservoir and void spaces with a molten resin composition by injection in a state where the void spaces are formed between the tip of the movable pin and the resin reservoir by drawing the movable pil, the molten resin composition in the resin reservoir is pushed into the cavity by moving the movable pin to the side of the resin reservoir before the molten resin composition solidifies, and the molten resin composition is solidified in the compressed state to produce a ball bearing cage. |
