| 摘要 |
A cam of a camshaft has its surface hardened by rotating the camshaft about its axis while maintaining a TIG torch at a fixed spacing from the surface, and while relatively axially reciprocating the torch and the camshaft so the torch heats the surface along an undulating path. The pitch or crest-to-crest spacing of this path is maintained constant for uniform hardening either by varying the angular rotation rate of the camshaft or by varying the axial reciprocation frequency between the camshaft and torch. The radial spacing of the portion of the surface being heated at a given instant from the axis is measured to control the rotation or reciprocation rate. |
