关键词: 本构模型, 成形设备, 粉末压制　模架集成, 数值模拟

Abstract: The special powder molding machine integrating mould frame is designed and manufactured with the feature such as low-cost, small size and high-precision. During the course of the design and manufacture for the special powder molding machine, the flow stress constitutive model of powder and the multi-body dynamics model are construct. Furthermore, the 1 MN powder metallurgy press is put forward based on the numerical simulation by combining the software of MSC.Marc and MSC.Adams. The numerical result of punch load is computed by software of MSC.Marc and the obtained result is exerted as a boundary condition for simulating the pressing process of the special powder molding machine. From the numerical result, the mechanical state of each pattern plate is analyzed in software of MSC.Adams so that the reliability of the special powder molding machine is obtained at the actual working condition. The control system combining the electro-hydraulic proportional valve and grating ruler is developed which makes the two contrapositive hydro-cylinders drive at the same time. And the movement coordination of different mould plates is resolved. The axial pressing accuracy of the formed part is ±0.02 mm manufactured by the test prototype. There is consistentency between the measured punch load and the numerical result during the compaction which demonstrates that the constitutive model used for powder forming equipment design is accurate and the method based on numerical simulation is correct for powder forming equipment design.

Key words: Constitutive model, Integrated mould-frame, Numerical simulation, Powder compaction, Powder forming equipment