جستجوی مقالات مرتبط با کلیدواژه « material removal » در نشریات گروه « مکانیک »

Abrasive flow machining (AFM) is a relatively new process with low material removal ratio for deburring, removing recast layers and finishing industrial components with complex shapes among non-conventional machining processes. In this process, the finishing is handled by flowing of the composition of viscoelastic and abrasive particles on workpiece surface, under the pressure of piston. In this research, the abrasive flow machining process of H13 tool steel with applied an external magnetic field around the workpiece for improve the material removal ratio and surface roughness has been investigated and the effect of magnetic field intensity, abrasive particles mesh and the hardness of workpiece as the input parameters on the process outputs including surface roughness and material removal ratio was studied. Also the regression model of MRR and surface roughness was developed and variance analysis was performed. Results of experiments indicated that increase in abrasive-particles mesh leads to decrease surface roughness and material remove ratio and increase in magnetic field intensity causes to increase material removal ratio and decrease surface roughness. Also the material removal ratio is decreased with increasing of workpiece hardness and on the same condition; better surface finish was achieved in the case of harder workpiece.

Abrasive flow machining is a new method of metal surface machining which polishes the surfaces and edges of complex or small industrial parts with high quality and close tolerances. In this method¡ a fluid containing abrasive particles passes on the surface or inside of the work piece in a reciprocating way. During the process¡ the work-piece reaches the desired surface roughness over time. The main problem in using this method is the low removal rate¡ and thus longer leadtime to carry out the process. In this study¡ abrasive flow machining process is simulated in Fluent software using discrete phase model¡ and then to increase the rate of material removal¡ centrifugal force imposed by the rotating rod is applied. Simulation was performed for the material removal of inner wall of a pipe. Moreover¡ the influence of the axis rotational speed parameters¡ the mass fraction of abrasive particles and number of removal cycles on material removal rates were evaluated. Also¡ based on the response surface method¡ a series of experiments were designed¡ and the effects of input parameters and their interactive effects on the rate of material removal were evaluated by analysis of variance method. Finally¡ a regression model is provided to predict the removal rate in the process according to the effective parameters.