| 摘要 |
A method of casting a cam shaft with an axial oil passage comprising inserting a core rod into a steel pipe in closely fitted relation, coating the solid core on its outer periphery with a releasing agent of low thermal conductivity, placing the core and pipe assembly in a mould with the solid core aligned with the axis of a cam shaft to be formed, and pouring molten metal around the core assembly in the mould. Thereafter, upon completion of the casting, the solid core is withdrawn from the pipe to thereby form the aligned oil passage, within the cam shaft.
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