Effect of Annealing Heat Treatment and Casting Thickness on Milling Performance of Compacted Graphite Iron
The cutting force,cutting temperature and the machined surface roughness during milling compacted graph-ite cast iron RuT450 from the engine cylinder are investigated,the influences on machinability are analyzed in conjunction with the evolution of microstructure and mechanical properties.The results show that the microstructure and mechanical properties of the materials vary with casting thickness.Cutting force is a comprehensive reflection of graphite content,ver-micular rate,residual stress,hardness,tensile strength,and other performance indicators.Cutting heat generation is closely related to cutting force.Under the premise of ensuring the strength index,annealing is beneficial for lowering the cutting temperature during milling and can also reduce the cutting force for a certain workpiece thickness.Annealing can signifi-cantly improve the surface quality of a workpiece when milling at relatively low speeds.After stress relief annealing,the cut-ting speed can be properly improved to increase machining efficiency of compacted graphite iron under the premise of ensu-ring surface quality.
万方数据
维普
