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| 内凹和外凸轮廓切挤复合精整时的材料流动分析 |
| Material Flow Analysis of Cutting-extruding Composite Finishing for Inner Concave Contours and Outer Convex Contours |
| Received:August 01, 2016 Revised:November 10, 2016 |
| DOI：10.3969/j.issn.1674-6457.2016.06.006 |
| 中文关键词: 切挤复合精整 剪切滑移 材料流动 变形区 速度场 |
| 英文关键词: cutting-extruding finishing shear sliding material flow deformation zone velocity field |
| 基金项目:国家自然科学基金（51375521）；重庆市模具技术重点实验室开放课题基金（MT201502）；重庆理工大学研究生创新基金（YCX2015211） |
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| 中文摘要: |
| 目的 为了探索零件精整面的成形规律，研究2种轮廓的材料流动情况。方法 利用有限元模拟方法进行研究，根据精整轮廓的不同特点，首先对切挤复合精整中的变形区进行了分析，接着对外凸和内凹轮廓零件切挤复合精整时的材料流动进行了研究，得出了材料变形区的流动、剪切滑移等的规律。结果 变形区可以细分为主变形区、新面形成区、废料变形区和剪切滑移区等；内凹轮廓精整处于稳定精整阶段时，基体材料内部有涡流现象出现，然而，在外凸轮廓精整的整个过程中，基体材料都没有形成涡流，涡流可以提高静水压应力，抑制裂纹的产生，促使得到光洁度较好的零件；在整个精整过程中，外凸轮廓零件材料相比于内凹轮廓在精整方向上滑移了较长的距离，才能移动到新成形表面，内凹轮廓变形区材料所受应力多为压应力。结论 内凹比外凸轮廓精整易得到较好的成形质量。 |
| 英文摘要: |
| The work aims to research the flowing of materials of two kinds of contours, so as to explore the forming law of the finishing surface of the parts. Researches were conducted in the finite element simulation method. According to the different characteristics of finishing contour, firstly, the deformation zone of cutting-extruding composite finishing was analyzed. Secondly, the material flow of cutting-extruding composite finishing for parts of outer convex contours and inner concave contours was studied. In such case, the rules of the material flow in the deformation zone and shear sliding were obtained. The deformation zone could be divided into the main deformation zone, the new surface forming zone, the deformation zone of the waste material and the shear sliding zone, etc.; when the inner convex contours were at the stable finishing stage, there was vortex in the matrix material. However, in the whole process of finishing the outer convex contour, no vortex was formed in the matrix material. The vortex could increase the hydrostatic pressure, restrain the generation of the crack, and make the parts with better finish. In the whole finishing process, compared with the material of the parts of inner concave contour, the material of the parts of outer convex contour slipped a longer distance to be on the new forming surface in the finishing direction. The stress of the material in the deformation zone of the inner concave contour was mostly pressure stress. In conclusion, it is easier for the inner concave contour to get a better forming quality than the outer convex contour. |
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