Investigating machining factors of recovery powder metallurgy parts, from filings and sintered by Design of experiments in conjunction with sensitivity analysis

Recovery of machined filings in the form of powder used in the metallurgy industry has a very favorable economic advantage. In order to optimize this process and maximize the efficiency of recovering gray cast iron filings by spray mill method, the experimental design techniques are used in conjunction with the sensitivity analysis in this paper. By Design of experiments based on the response procedure, four main factors were extracted as input variables including cast iron powder, compression pressure, sintering temperature and sintering time. These input variables are investigated on three important outputs of machining capabilities including axial force, drilling torque and surface roughness based on sensitivity analysis. The sensitivity analysis method, which is based on the analysis of variance, is E-fast. The sensitivity analysis is a statistical method results in describing the quantitative and qualitative changes of the input variables on the output factors. For the axial force, the effect of the input variables was obtained with 37%,31%,27%,5% for cast iron powder, sintering temperature, compression pressure and sintering time, respectively. Also for drill torque, parameter impressment is 44% cast iron powder, 38% compression pressure, 15% sintering temperature and 3% sintering time, respectively. Cast iron powder percentage, compression pressure, sintering temperature and time have impressed on surface roughness, respectively with 26 %, 49 %, 19%, 6%.