Our factory processed the “lower cover†inner cavity facet of the three series of steam turbine speed-closing valve on the CW61100 lathe (see Figure 1). The surface roughness is Rα3.2. Due to the serious weight of the part and the influence of the structure, The clamping surface is the casting blank surface, which is not very reliable when clamping. Therefore, the spindle speed of the lathe is limited during turning (usually n≤80r/min), and the cutting speed is low (cutting speed is about 8-20m/min). The tool is prone to build-up of the built-up edge. The conventional tool structure, whether it is a carbide tool or a high-speed steel tool, is not ideal, and the surface roughness of the machine can only reach Rα6.3. Can not meet the processing requirements of the drawings, for this reason we try to use a wide-blade high-speed steel turning tool with high liquidity floating fluid to process the plane, the effect is very
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