The Key Technology Research And Development Of Mechanical Parts Of Rapid Prototyping

Selective laser sintering rapid prototyping is an important branch of rapid prototypingtechnology, its molding process involving machinery, precision servo drive, the material, thelaser, powder sintering theory, CAD technology and heat transfer, and many other relateddisciplines. The rapid prototyping manufacturing of mechanical parts is a in the field ofselective laser sintering rapid prototyping manufacturing, in recent years, rapid prototypingtechnology at home and in the mechanical parts have certain development, but as a result ofrapid molding equipment of manufacturing machinery parts manufacturing cost is higher,molding machinery parts manufacturing factors, forming process is complicated and restrictthe development in the aspects of its.This paper focuses on the rapid prototyping sintering temperature field numericalsimulation of mechanical parts by selective laser sintering and sintering process of precisionmotion control technology is studied, the content includes the influence of preheatingtemperature on the rapid prototyping machine parts, the influence of laser sintering processparameters on sintering temperature field, using the"PC+PLC+servo controller"way ofselective laser sintering on the mechanical parts of the precisionmotion control, especially, theuniformity of shop for powder for precision motion control. Finally, the numerical simulationprocess of sintering temperature field simulation animation display,Selective laser sintering of mechanical parts is a fairly complex heat physical process,sintering process under the influence of factors such as heat convection, heat conduction andthermal radiation. After building to be sintered parts model, by processing the laser moving heatsource, realizing the multilayer powder laser sintering, nonlinear and phase change latent heat,etc, to develop effective solutions to the key problems oftemperature field simulation. Thenthrough the establishment of preheating temperature field to compare the effects of mechanicalparts by selective laser sintering at various preheat temperatures, the optimal preheatingtemperature for selective laser sintering304L stainless steel powder is preferred; through theanalysis of the preheating and laser power research selected the reasonable laser power. Finally,using the finite element Ansys to take sintering process parameters of temperature field analysissimulation. Aiming at the control system of rapid prototyping machinery parts manufacturing,the"PC+PLC+servo controller"control mode, PLC itself has the function of high-speed pulseoutput, Servo drives directly receive signal transmitted from PLC pulse and direction, bychanging the pulse frequency and the number to be able to complete. And in ensuring accuracyof laser sintering machine parts at the same time will also be able to accurately detect thevarious motion unit of the state, ensure the smooth progress of the mechanical partsmanufacturing.Based on the above research results have developed mechanical parts of selective lasersintering rapid prototyping simulation system, the simulation system can not only from all themoving parts of the geometry of equipment for sintering movement simulation, but also tosimulate the process of mechanical parts laser sintering thermal physical simulation, to achievethree-dimensional dynamic simulation show that the laser sintering process. Combined withfinite element of Ansys analysis software for the analysis of temperature field in laser sinteringprocess, it provides a theoretical support for the optimization of process parameters, processoptimization and laser sintering of selective laser sintering, the actual mechanical parts byselective laser sintering production has certain reference value.