| 摘要 |
1340700 Making valves FORD MOTOR CO Ltd 31 Dec 1970 [27 Jan 1970] 62010/70 Heading B3A A poppet valve is forged oversize with an annular groove, for wear-resisting material to form the valve seat, having a temporary edge C, the groove CJHF is filled oversize with a cobalt-chromium-tungsten alloy sold under the Registered Trade Mark "Stellite", surfaces GF and FE are turned, the valve seat DE is ground and the valve head and groove-filling material are removed in the area BCD by turning to leave a tapered face DB between the valve seat edge D and the radiused transition portion between the stem and the head of the valve. The final surface is defined by the solid line ABDEFG. |
