發(fā)布時間：2018-06-02 01:41

  本文選題：粉末冶金齒輪 + 表面致密��； 參考：《粉末冶金材料科學與工程》2015年06期

【摘要】：采用Deform-3D軟件對相對密度為90%的Fe-2Cu-0.6C粉末冶金齒輪表面滾壓過程進行有限元模擬,研究滾壓過程中齒輪應力應變和相對密度的分布及變化規(guī)律,并利用標準漸開線齒形的工具輪進行齒輪坯料滾壓實驗來驗證有限元模擬結果。模擬結果表明,輪齒兩側面的等效應變分布存在差異,進入滾壓面的最大等效應變出現(xiàn)在分度圓附近,退出滾壓面的最大等效應變出現(xiàn)在齒頂。齒面上的等效應力隨滾壓圈數(shù)增加而快速增大,并逐漸趨于穩(wěn)定。齒面表層相對密度的提高可分為3個階段,分別為孔隙快速壓實階段、密度緩慢增長階段與密度穩(wěn)定階段。工具輪完成0.6 mm的進給后,輪齒表面到心部的相對密度呈梯度分布,表面形成大約0.3~0.5 mm厚度的致密層(相對密度≥98%)。實驗結果與模擬結果具有較好的一致性,驗證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，

本文編號：1966731