卧式镗铣床镗轴挠度研究及其支承跨度优化

发布时间：2018-04-26 13:22

本文选题：镗轴 + Workbench　；参考：《昆明理工大学》2015年硕士论文

【摘要】：随着中国制造业的迅速发展,以数控机床为代表的数控设备应用越来越广,对机床的加工性能要求也越来越高。本课题来源于昆明机床厂,应客户要求对于大型卧式数控镗铣床镗轴变形挠度进行研究,经反馈该类机床在深孔镗削加工时,随着镗轴的不断伸长,产生的挠度使的加工质量和加工效率降低。而生产厂家在产品研发时又没有给出相应的的技术指标,即镗轴伸长量与其挠度关系。此外用户还要求有针对性的采取措施以降低镗轴挠度。基于以上问题,本文选取了较为典型的大型数控TKS6111卧式镗铣床为研究对象,对镗轴伸长量与其挠度之间的关系及挠度进行了分析研究。主要研究内容有以下几个方面：(1)结合前期调研和实际情况,对镗铣床镗轴系统变形挠度的分析方法及其精度进行分析研究,确定采用镗轴系统有限元模型进行挠度分析和支承轴承跨度优化两种方案。(2)考虑到结合部对挠度的影响,将支承轴承利用虚拟材料来模拟替代,对部分结合面添加相应接触刚度和阻尼,建立简化镗轴系统CAD模型。再利用ANSYS Workbench有限元化。最后通过模态试验校正有限元模型。(3)基于校正后的镗轴系统有限元模型,在Workbench中对其边界约束和载荷施加,以精镗为加工背景,分析不同伸长量下镗轴端部圆心的变形挠度。提取分析数据绘制镗轴伸长量与其挠度之间的关系曲面,并选取不同工况下的挠度曲线作进一步讨论。(4)对有限元模型利用Workbench进行参数化,依据实际工况的可行性和易操作性,对镗轴挠度的影响因素,即设计变量进行分析确定。最终确定轴承支承跨度作为设计变量,镗轴端部挠度作为优化目标,对镗轴系统进行优化,以降低镗轴的挠度,以达到优化目的。本文针对客户要求,对镗轴伸长量与其挠度之间的关系及其支承轴承跨度优化进行了分析研究,得出一些较为科学的数据,为老产品的改进和新产品的开发提供一种科学的设计方法和数据参考。
[Abstract]:With the rapid development of China's manufacturing industry, numerical control equipment represented by numerical control machine tools is more and more widely used, and the machining performance of machine tools is becoming more and more demanding. This subject comes from Kunming Machine tool Factory. According to customer's request, the deflection of boring shaft of large horizontal NC boring and milling machine is studied. The resulting deflection reduces the processing quality and efficiency. However, the manufacturer did not give the corresponding technical index, that is, the relationship between the boring shaft elongation and the deflection of the boring shaft. In addition, users also require targeted measures to reduce boring axis deflection. Based on the above problems, this paper selects the typical NC TKS6111 horizontal boring and milling machine as the research object, and analyzes the relationship between the boring axis elongation and its deflection and the deflection. The main research contents are as follows: (1) combined with previous investigation and practice, the analysis method and precision of deflection of boring shaft system of boring and milling machine are analyzed and studied. The finite element model of boring shaft system is adopted for deflection analysis and support bearing span optimization. Considering the influence of joint part on deflection, the bearing is simulated and replaced by virtual material. The corresponding contact stiffness and damping are added to some joints, and the simplified CAD model of boring shaft system is established. Then the finite element method of ANSYS Workbench is used. Finally, based on the corrected finite element model of the boring shaft system, the boundary constraints and loads are applied in Workbench, and the deformation deflection of the center of the end of the boring shaft is analyzed with the fine boring as the machining background. Extracting and analyzing data to draw the relation surface between the elongation of boring shaft and its deflection, and selecting deflection curve under different working conditions for further discussion. (4) parameterizing finite element model using Workbench, according to the feasibility and easy operation of actual working condition, the finite element model is parameterized. The influence factors of deflection of boring axis, namely design variable, are analyzed and determined. Finally, the bearing support span is determined as the design variable and the boring shaft end deflection is chosen as the optimization objective. The boring shaft system is optimized in order to reduce the deflection of the boring shaft and achieve the purpose of optimization. In this paper, the relationship between the elongation of boring shaft and its deflection and the optimization of bearing span are analyzed and studied, and some scientific data are obtained. It provides a scientific design method and data reference for the improvement of old products and the development of new products.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG536

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