ON BLANKING, TUMBLING AND SHOT-PEENING OF COMPRESSOR VALVES

摘要

Valve components used to control direction of flow of fluids through compressors, pump or other pneumatic devices are subjected to dynamic loading. Studies of service valve fractures indicated, that a large proportion failed due to fatigue (1-3). The fatigue cracking originated from stress concentrating defects introduced during the fabrication of the valve or the manufacture of the steel strip. The work presented below studies the effect of manufacturing operations on the quality of edges and surfaces of valve components made of high-strength strip steels. Limitations in valve processing by blanking and photoetching are shown. Valve treatment by rotating tumbling and vibratory finishing and its positive and negative effects are described. The benefit of residual compressive stresses introduced by tumbling and shot-peening is discussed. Fatigue testing results illustrating the influence of various edge treatments are given and some practical viewpoints on valve processing are indicated.