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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 >FINITE ELEMENT SIMULATION OF WARM COMPACTION PROCESS COMPARED WITH EXPERIMENTAL RESULTS
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FINITE ELEMENT SIMULATION OF WARM COMPACTION PROCESS COMPARED WITH EXPERIMENTAL RESULTS

机译：与实验结果相比的热压过程的有限元模拟

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摘要

The present paper summarizes the results of a combined experimental and numerical analysis of warm powder compaction. The process of warm compaction allows the production of high density green parts in a single uniaxial compaction step. In order to simulate the process, specific material data of the warm compaction powder and a constitutive model are needed to show how material properties change with pressure. The numerical simulation is based on the Drucker-Prager/Cap model. Axial pressure and strength tests have been carried out in order to determine the density dependent model parameters. For the axial pressure tests, an instrumented warm compaction tool was developed which provides the possibility to measure the axial pressure at the punches and the radial pressure at the die wall during densification. The friction between powder and die wall and the green density distribution were determined experimentally. As a result of finite element simulations, the density and stress distributions in the green parts during the warm compaction process can be obtained. The calculated densities are in good agreement with the measured density distribution of manufactured green parts. Based on the Drucker-Prager/Cap model, the warm compaction process can be simulated correctly.
机译：本文总结了温粉压实试验与数值分析相结合的结果。热压实的过程允许在单个单轴压实步骤中生产高密度的生坯零件。为了模拟该过程，需要热压实粉末的特定材料数据和本构模型来显示材料特性如何随压力变化。数值模拟基于Drucker-Prager / Cap模型。为了确定密度相关的模型参数，已经进行了轴向压力和强度测试。对于轴向压力测试，开发了一种仪器化的热压实工具，该工具可以在致密化过程中测量冲头处的轴向压力和模具壁处的径向压力。实验确定了粉末与模具壁之间的摩擦力以及生坯密度分布。作为有限元模拟的结果，可以获得在压实过程中生坯中的密度和应力分布。计算出的密度与制造的生坯的密度分布实测吻合。基于Drucker-Prager / Cap模型，可以正确模拟暖压过程。

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