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工程设计学报
Chinese Journal of Engineering Design  2019, Vol. 26 Issue (1): 56-64    DOI: 10.3785/j.issn.1006-754X.2019.01.008
    
Structure design and optimization for crossbeam of bridge gantry milling machine
GAO Zhi-lai1, QIU Zi-xue1, REN Dong2, CUI De-you2, XU Xin-peng2
1. School of Mechanical Engineering, Nantong University, Nantong 226019, China;
2. Nantong Guosheng Intelligent Technology Group Co., Ltd., Nantong 226003, China
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Abstract  

Crossbeam is the main moving part of bridge gantry milling machine, and its structure design directly affects the working performance of machine tool. Therefore, a structure design and optimization method for crossbeam based on orthogonal experimental design, improved fuzzy comprehensive evaluation and size sensitivity analysis was proposed. According to the multi-factor and multi-level characteristics of crossbeam structure design, eight kinds of representative parameter combinations were selected as the structure design scheme of crossbeam by orthogonal experimental design. The improved fuzzy comprehensive evaluation method was used to process the finite element simulation data, so that the optimum selection scheme of crossbeam with parameters combination "box in box-well-20 mm-linear guideway" was determined. And the sensitivity analysis and optimization of its key design sizes were carried out to obtain the specific of crossbeam structure design size. After optimization, the static performance and anti-vibration performance of crossbeam were improved obviously while the lightweight design of crossbeam was also realized, which played a guiding role in the actual manufacture of machine tool crossbeam. The research result shows that the proposed structure design and optimization method for crossbeam has high engineering practicability, and it also provides a new idea for the design of other key parts of CNC machine tools.

Key words： bridge gantry milling machine      crossbeam      orthogonal experimental design      finite element analysis      improved fuzzy comprehensive evaluation method      size optimization     
Received: 04 May 2018      Published: 28 February 2019
CLC:  TH122  
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GAO Zhi-lai
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REN Dong
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XU Xin-peng
Cite this article:

GAO Zhi-lai, QIU Zi-xue, REN Dong, CUI De-you, XU Xin-peng. Structure design and optimization for crossbeam of bridge gantry milling machine. Chinese Journal of Engineering Design, 2019, 26(1): 56-64.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2019.01.008     OR     https://www.zjujournals.com/gcsjxb/Y2019/V26/I1/56


桥式龙门铣床横梁结构设计与优化

横梁作为桥式龙门铣床的主要运动部件，其结构设计的优劣直接影响机床整机的工作性能。为此，提出了一种基于正交试验设计、改进模糊综合评价和尺寸灵敏度分析的横梁结构设计与优化方法。针对横梁多因素多水平的结构设计特点，采用正交试验设计挑选出8种具有代表性的参数组合作为横梁结构设计方案。运用改进模糊综合评价法对有限元仿真数据进行处理，确定参数组合为"箱中箱式-井型-20 mm-线轨"的横梁优选方案，并对其关键设计尺寸进行灵敏度分析与优化，得到横梁结构具体的设计尺寸。优化后，横梁的静力学性能和抗振性能得到明显改善，并实现了轻量化设计，对机床横梁的实际制造起到了指导作用。研究结果表明，所提出的横梁结构设计与优化方法具有较强的工程实用性，为数控机床其它关键零部件的设计提供了新思路。


关键词： 桥式龙门铣床,  横梁,  正交试验设计,  有限元分析,  改进模糊综合评价法,  尺寸优化 

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