摘要
为降低不确定因素对机床支承件精度的影响,提高支承件精度稳健性,针对机床支承件安装基准面,提出一种考虑载荷不确定性的机床支承件公差优化设计方法。首先建立机床支承件精度稳健性优化模型;其次,考虑载荷不确定性求解与支承件所联接零部件的位姿误差分布,利用响应面法构建支承件安装基准面公差、载荷不确定变量与支承件误差分布参数间的近似模型;再次,结合现有的加工成本函数,利用粒子群嵌套优化算法求解优化问题。以某龙门式加工中心横梁为例,利用不确定性优化方法优化基准面公差。最后,通过与确定性优化结果对比,发现提出的稳健性公差优化设计方法在保证加工成本较低的同时,可以有效提升设计产品的稳健性。
A tolerance design optimization method considering uncertainty of load is proposed in order to reduce the sensitivity of uncertainties and improve the accuracy robustness of the support of machine tools. Firstly, a machine tool support accuracy robustness optimization model for tolerance design is established. Secondly, the pose error distribution of the connection parts of support is solved, the support surface method is used to construct the approximate model between the tolerance, load uncertainty variable and distribution parameters of support’s error. Again, combined with the existing processing cost function, the nested particle swarm optimization algorithm is used to solve the optimization problem. At last, a gantry machining center beam is taken as an example, the uncertainty optimization method are used to optimize the tolerances of the datum plane. By comparing with deterministic optimization results, it is found that the uncertainty tolerance optimization design method proposed in this paper can effectively improve the robustness of accuracy, at the same time, maintain lower processing costs.
作者
马雅丽
刘子哲
钱峰
MA Ya-li;LIU Zi-zhe;QIAN Feng(School of Mechanical Engineering,Dalian University of Technology,Liaoning Dalian 116024,China)
出处
《机械设计与制造》
北大核心
2019年第A01期13-16,21,共5页
Machinery Design & Manufacture
基金
国家科技重大专项(NO.2015ZX04005002-03)
关键词
机床支承件
公差
优化设计
不确定性
精度
稳健性
Machine Tool Support
Tolerance
Optimization Design
Uncertainty
Accuracy
Robustness
