| Popis: |
The three-dimensional finite-element machining simulation method has successfully been employed to analyse machinability of both leaded CrMo an leaded MnB steels based on realistic plastic flow properties of the work-pieces and friction characteristics at the tool-chip interface. There is no remarkable difference in the predicted cutting forces, temperature rise, tool wear and surface integrity, but a slight difference can be seen. The MnB steel shows a slightly lower cutting temperature and wear rate on the rake face of a P20 carbide tool since the flow stress is smaller than that of the CrMo one. The use of a button tool is rather effective in the light of the reduction of the rake temperature and crater wear. These tendencies are in good agreement with experiments. Finally, the analysis of production cost has revealed that both steels give almost the same production cost-cutting speed characteristics below 400 m/min. However, since the material cost of the MnB steel is about 20% cheaper than that of the CrMo one, the substitution of the MnB steel for the CrMo one is cost-effective as well. |
Full Text from ScienceDirect