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An integrated setup/fixture planning approach for machining prismatic parts

机译：用于加工棱柱形零件的集成安装/夹具规划方法

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摘要

Setup/fixture planning for machining prismatic parts is usually carried out by grouping features/operations into setups, determining suitable locating surfaces for each setup, and sequencing setups and operations in each setup. The presently developed setup/fixture planning methods can be classified into three categories: multi-constraints, fixture driven, and tolerance analysis planning methods. The multi-constraints planning is theoretically sound, but very difficult to use. In fixture driven planning, the generated setup plans are highly practical, but may not be optimal. Tolerance analysis based planning cannot be used to generate the optimal solution by itself. In this research, a new integrated setup/fixture planning approach is developed to identify the optimal and practical setup/fixture plan. The planning is conducted in four steps. (1) The dissimilarity degree matrix (DDM), operation precedence graph (OPG), and hybrid graph are used to describe the requirements and constraints for setup/fixture planning. (2) A setup precedence graph (SPG) is used to describe precedence constraints between setups. The SPG is generated by the vertex clustering algorithm. Precedence loops among setups are avoided by checking whether two serial vertex clusters can generate a loop. (3) Suitable locating surfaces are selected for each setup in a SPG. When the fixture locating surface and design datum surface are different, two types of dimension recalculations are employed to obtain the dimensions against the locating surfaces. (4) All the candidate setup/fixture plans are evaluated based on the number of setups and recalculation of dimensions. An example is given to demonstrate the effectiveness of the developed approach.
机译：通常，通过将特征/操作分组到装配中，确定每个装配的合适定位面以及对每个装配中的装配和操作进行排序，来执行加工棱柱形零件的装配/夹具规划。当前开发的安装/夹具计划方法可以分为三类：多约束，夹具驱动和公差分析计划方法。从理论上讲，多约束计划是合理的，但使用起来非常困难。在夹具驱动的计划中，生成的设置计划非常实用，但可能不是最佳的。基于公差分析的计划不能单独用于生成最佳解决方案。在这项研究中，开发了一种新的集成安装/固定装置计划方法，以确定最佳和实用的安装/固定装置计划。该计划分四个步骤进行。 （1）相似度矩阵（DDM），操作优先级图（OPG）和混合图用于描述安装/夹具规划的要求和约束。 （2）设置优先级图（SPG）用于描述设置之间的优先级约束。 SPG由顶点聚类算法生成。通过检查两个串行顶点簇是否可以生成循环，可以避免设置之间的优先循环。 （3）为SPG中的每种设置选择合适的定位面。当夹具定位表面和设计基准表面不同时，采用两种类型的尺寸重新计算以获得相对于定位表面的尺寸。 （4）根据安装数量和尺寸的重新计算，评估所有候选安装/固定装置计划。举例说明了所开发方法的有效性。

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  • 来源
    《International Journal of Production Research》 |2012年第4期|p.1009-1027|共19页
  • 作者

    Xiwu Sun; Xuening Chu; Deyi Xue; Yuliang Su; Censhu Tang;

  • 作者单位

    School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;

    School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;

    Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, T2N 1N4, Canada;

    School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;

    School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    setup/fixture planning; hybrid graph; setup precedence graph; locating surfaces;

    机译：布置/固定装置规划;混合图设置优先级图;定位面;

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