Thermal Simulation And Finite Element Analysis Study About Powder Forging

Powder Forged (P/F) is the major processes forming part of today’s metallurgymachinery used in the industry. Using a rigid mold or cold isostatic pressing formingtechnology of powder materials to compressed into preform billet, then after or withoutpresintering or final sintering at low temperature. Eventually use hot forging or coldforging method to change its shape at the same time to make the material reach thedegree of densification. The paper use the method of theory research, the thermalsimulation experiment, the finite element numerical simulation to study the powderforging(the hot forging)forming law and the densification mechanism systematically.The paper use thermal simulation experiment data to plot out the iron-based powdersintering material’s plastic deformation of high temperature creep stress strain curve,deduced the material constitutive equation and established the model of the material.Using DEFORM-3D finite element software, the powder sintered material formingprocess of heat upsetting and closed die forging is studied by numerical simulation.Analysis the impact of different initial relative density, forging speed and friction factorto forming law and densification mechanism of powder forging. The conclusion of thepaper research can expand and deepen the precision plastic forming theory of powdermetallurgy materials, and of great significance in Promoting the application of powderforging precision plastic forming technology and the development of the computersimulation optimization technique. The main contents are as follows:(1) Using thermal simulation test machine, iron-based powder metallurgy sinteringmaterials to do a lot of hot compression experiments, obtaining the required flow stressdata, studies under the conditions that the deformation temperature950℃~1050℃, thedeformation rate of0.01s-1~1s-1, the heat of the iron-based powder metallurgy sinteringmaterial flow stress-strain curves and the evolution of the microstructure before andafter deformation;(2) Studied the deformation temperature and strain rate deformation parameters onboth the flow stress of iron-based powder metallurgy sintering material impact on the law, and established a relationship model of the flow stress of the material under hightemperature conditions;(3) Established by the material constitutive relation model, using the finite elementsoftware DEFORM-3D do numerical analysis to study the powder forging processtemperature field, stress and strain fields, load, relative density changes, as well asfurther research on this basis a different process parameters (forging speed, initialrelative density, friction factor) influence of the powder sintered compact in closed dieforging process observed in the whole process of forging a medium effect force changecloud, cloud equivalent strain change, the relative density value chart variation withtime and load variation throughout the forming process.