The Research On Thermal Deformation Behavior Of Al-W Alloy Powder Compacted And Forming Technology Of The Orbiting Scroll

In recent years, the development of automobile industry is very fast and has become apillar industry in our country. In order to achieve the purpose of lighting vehicle, as a newkind of light alloy, aluminum alloy is widely used in automotive manufacturing. Whenpeople’s living standard is improved, the safety and comfort of vehicles receive more attention.The air conditioning of vehicles is one of the important parts to make automobile comfortable,and the orbiting scroll are the core of automotive air conditioning compressor parts, which hasextremely important influence on the performance of the automobile air conditioning, so moreand more attention are paid on the researching of material and forming technology of theorbiting scroll. Ordinary aluminum alloy used to be the raw material during the traditionalforming process of the orbiting scroll. In this paper, a new type of material (Al-W powder)was adopted, for which a new method of powder forming was put forward to overcome thedisadvantages existing during the traditional forming process, such as low local density ofpowder metallurgy components and certain limitation for the structure of the product shapeand improve the wear resistance of parts.In this paper, Al-W powder prepared by mechanical alloying was selected as the rawmaterial. Through the method of powder compacting, hot extrusion billet of Al-W powderalloy was got, which was used as the workblank of the orbiting scroll part.Thermalcompression simulation test was conducted to study the thermal deformation behavior ofAl-W powder alloy formed by powder pressing at room temperature and subsequent hotpressing. Through the regression analysis method, the correlation between the flow stresses σ,strain rate and deformation temperature T was studied and the flow stress constitutiveequation of Al-W powder alloy was established, which provides necessary material model andthe parameters for the numerical simulation. The constitutive model established is as follows: According to the dynamic materials model, the hot processing maps of Al-W powder alloy were established and analyzed to determine the best process parameters. The best safe machining area is temperature of560℃-570℃, the strain rate of0.001s-1-0.01s-1, at this time, the maximum power dissipation factor is0.55, which provides the experimental parameters for the experimental procedure.Through the software of DEFORM-3D, the back pressure forming of Al-W powder alloy orbiting scroll was simulated and the flow regularity of the metal during the forming process was analyzed. But that, the influence of the fillet radius size of the mould on the forming force and equivalent stress distribution was analyzed, which provides a reasonable basis for the mould processing of orbiting scroll. The conclusion obtained is with the increasing of radius value, the forming load decreases and the larger the radius value is, more uniform the equivalent stress distribution of the vortex body parts is and more uniform the deformation is, according to which, finally the appropriate radius was determined as2.5. At last, in order to verify the accuracy of the result of the finite element simulation, the experiment test of the orbiting scroll part was carried out.