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加工图法在热轧大圆钢表面质量控制中的应用 被引量:2
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作者 严文超 杨森 +1 位作者 章静 阎军 《安徽工业大学学报(自然科学版)》 CAS 2011年第3期223-227,共5页
采用Murthy流变失稳准则的加工图方法来判断塑性变形中产生的流动失稳。通过GCr15轴承钢的热模拟压缩实验,研究变形工艺参数对GCr15高温变形时流动应力的影响规律,建立GCr15高温变形时的加工图;通过对实际孔型中轧制情况的分析,得出轧... 采用Murthy流变失稳准则的加工图方法来判断塑性变形中产生的流动失稳。通过GCr15轴承钢的热模拟压缩实验,研究变形工艺参数对GCr15高温变形时流动应力的影响规律,建立GCr15高温变形时的加工图;通过对实际孔型中轧制情况的分析,得出轧件可能产生缺陷的位置。研究结果表明:非稳定区域在950~1050℃之间,应变速率在2.0s-1以上。 展开更多
关键词 加工图法 大圆钢 表面质量 动态材料模型
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SOME ALGORITHMS FOR NC MACHINING SIMULATION AND VERIFICATION 被引量:1
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作者 伍铁军 周儒荣 廖文和 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2003年第1期30-35,共6页
This paper presents an approximation method to display realistic pictures of numerical control (NC) machining simulation very quickly. T he tool movement envelope is divided into many small regions and the normal to... This paper presents an approximation method to display realistic pictures of numerical control (NC) machining simulation very quickly. T he tool movement envelope is divided into many small regions and the normal to t hese small regions is calculated. The system saves the calculated result in a fi le before starting animation display. When the system starts displaying machinin g animation, it does not need to calculate small triangular facets normal to the workpiece surface. It only needs to find out what part of the cutter cuts the w orkpiece surface and to read the normal from the file. A highly efficient NC cod e verification method is also presented in this paper. The method first detects the error in z direction. If some points are reported to be out of the tolerance , the system divides neighborhood of these points into smaller grids and calcula tes the normal surface at each grid intersection and the error in the normal ve ctor direction. 展开更多
关键词 numerical control machi ning SIMULATION VERIFICATION realistic picture
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Graph and Hint Based Algorithm for Machining Feature Automation Recognition and Mapping
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作者 张汝珍 周雄辉 邱彦杰 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第5期574-579,共6页
Feature recognition is a process of extracting machining features which has engineering meaning from solid model, and it is a key technology of CAD/CAPP/CAM integration. This paper presents an effective and efficient ... Feature recognition is a process of extracting machining features which has engineering meaning from solid model, and it is a key technology of CAD/CAPP/CAM integration. This paper presents an effective and efficient methodology of recognizing machining feature. In this approach, features are classified into two categories: pocket feature and predefined feature. Different feature type adopts its special hint and heuristic rule, and is helpful to recognize intersection feature. Feature classification optimizes search algorithm and shortens search scope dramatically. Meanwhile, extension and split algorithm is used to handle intersecting feature. Moreover, feature mapping based on machining knowledge is introduced to support downstream application better. Finally, case studies with complex intersecting features prove that the developed approach has stronger recognizing ability. 展开更多
关键词 feature recognition intersecting feature feature mapping
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