粉末冶金Fe-2Cu-0.6C齿轮表面滚压致密的有限元模拟与实验研究

发布时间：2018-06-02 01:41

  本文选题：粉末冶金齿轮 + 表面致密　； 参考：《粉末冶金材料科学与工程》2015年06期

【摘要】：采用Deform-3D软件对相对密度为90%的Fe-2Cu-0.6C粉末冶金齿轮表面滚压过程进行有限元模拟,研究滚压过程中齿轮应力应变和相对密度的分布及变化规律,并利用标准渐开线齿形的工具轮进行齿轮坯料滚压实验来验证有限元模拟结果。模拟结果表明,轮齿两侧面的等效应变分布存在差异,进入滚压面的最大等效应变出现在分度圆附近,退出滚压面的最大等效应变出现在齿顶。齿面上的等效应力随滚压圈数增加而快速增大,并逐渐趋于稳定。齿面表层相对密度的提高可分为3个阶段,分别为孔隙快速压实阶段、密度缓慢增长阶段与密度稳定阶段。工具轮完成0.6 mm的进给后,轮齿表面到心部的相对密度呈梯度分布,表面形成大约0.3~0.5 mm厚度的致密层(相对密度≥98%)。实验结果与模拟结果具有较好的一致性,验证了有限元模型的可靠性。
[Abstract]:The surface rolling process of 90% Fe-2Cu-0.6C powder metallurgy gear was simulated by Deform-3D software. The distribution and variation of stress strain and relative density of gear during rolling were studied. The standard involute gear wheel is used to verify the finite element simulation results. The simulation results show that there are differences in the distribution of the equivalent strain between the two sides of the gear tooth. The maximum equivalent strain entering the rolling surface appears near the indexing circle, and the maximum equivalent strain of the exit rolling surface appears at the top of the tooth. The equivalent stress on the tooth surface increases rapidly with the increase of the number of rolling rings and tends to stabilize gradually. The increase of relative density of tooth surface can be divided into three stages, namely, rapid pore compaction, slow density growth and density stabilization. When the tool wheel is fed with 0.6 mm, the relative density from the tooth surface to the center of the gear is gradient distribution, and a dense layer (relative density 鈮，

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