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首页> 外文会议>2002 International Conference on Process Modeling in Powder Metallurgy amp; Particulate Materials Oct 28-29, 2002 Newport Beach, California >TOOL DESIGN BASED ON NUMERICAL SUMULATION OF COMPACTION AND SINTERING
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TOOL DESIGN BASED ON NUMERICAL SUMULATION OF COMPACTION AND SINTERING

机译：基于压实和烧结数值模拟的刀具设计

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摘要

The delivery time of a new powder-metallurgical component is controlled by the tooling design, manufacture, and commissioning. Cracking of the part in the production process must be avoided, and close geometrical tolerances are often required. Further, excessive wear and fracture of tool components must be avoided. Thus, the commissioning of a new tool is often a time-consuming process incurring high costs of press downtime. A faster alternative to the conventional method of trial and error is to optimize the whole process by computer simulation. Finite element simulations of the compaction process in combination with appropriate material laws for the powder allow quantitative predictions of the density distribution in the green body as well as the tool loadings. Finally, the shape after firing can be predicted by using a material law for sintering. The sinter distortions are a result of inhomogeneous density distributions in the green body. The distortions can be minimized by an optimum press kinematics, and the remainder can be compensated by appropriately shaped punch surfaces. All this is demonstrated for a complex three-dimensional part made of Al_2O_3 powder.
机译：新粉末冶金部件的交货时间由模具设计，制造和调试来控制。必须避免在生产过程中零件破裂，并且经常需要严格的几何公差。此外，必须避免工具部件的过度磨损和断裂。因此，新工具的调试通常是一个耗时的过程，导致印刷机停机时间的高昂成本。替代常规试验和错误方法的更快方法是通过计算机仿真来优化整个过程。压实过程的有限元模拟与适用的粉末材料定律相结合，可以对生坯中的密度分布以及工具负荷进行定量预测。最后，可以通过使用材料定律进行烧结来预测烧成后的形状。烧结变形是生坯中密度分布不​​均匀的结果。变形可以通过最佳的冲压运动来减小，其余部分可以通过适当形状的冲头表面进行补偿。对于由Al_2O_3粉末制成的复杂三维零件，所有这些都得到了证明。

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