【摘要】：目的通過建立雙粗糙表面磨削模型,獲得微凸體曲率半徑對材料磨損的影響大小。方法選取磨具上微凸體與工件上不同變化曲率的微凸體分別建立滑動(dòng)磨削模型I和模型II,考慮了磨削過程中材料的彈性/塑性變形及其斷裂失效,運(yùn)用有限元方法分析探討滑動(dòng)過程相嵌微凸體的應(yīng)變變化以及磨屑脫離情況。結(jié)果磨削滑動(dòng)過程中,在同等接觸干涉量δ=1.30μm條件下,接觸角較小的微凸體接觸對(θ_1≈19.4°)其上微凸體發(fā)生磨損斷裂,而接觸角較大的微凸體接觸對(θ_2≈25.5°)其下微凸體發(fā)生磨損斷裂。磨損微凸體最大的等效塑性應(yīng)變量發(fā)生在次表層的1.5~2.0μm處。結(jié)論雙粗糙表面磨削過程中,在其他影響因素相同的情況下,曲率半徑較小的微凸體更易形成磨屑。磨損微凸體最大的等效塑性應(yīng)變量發(fā)生在次表層的某一深度處,隨著塑性變形的增大,應(yīng)力三軸度減小,導(dǎo)致材料表層下微觀裂紋的萌生形成磨屑。
[Abstract]:Aim to establish a double rough surface grinding model to obtain the influence of curvature radius of microconvex body on material wear. Methods the sliding grinding model I and II were established by selecting the micro-convex body on the abrasive tool and the micro-convex body on the workpiece with different curvature. The elastic / plastic deformation and fracture failure of the material were considered in the grinding process. The finite element method is used to analyze the strain variation and debris breakaway of the microconvex body embedded in the sliding process. Results during grinding and sliding, under the condition of equal contact interference 未 1 30 渭 m, the microconvex contact pair with small contact angle (胃 1 鈮，

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