Φ450mm大型双进给珩磨头的结构优化

发布时间：2018-07-22 12:32

【摘要】：随着我国经济的不断发展,对于大型柴油机缸套的需求也会进一步增加。珩磨机床作为加工柴油机缸套的关键设备必然会出现更高的需求。这种需求不仅表现在数量上,同时会表现在对性能提出更高的要求。珩磨头作为珩磨机床的刀具,其工作性能对于珩磨机床的加工质量影响很大。影响珩磨头工作性能的各项因素中,刚度对其影响最大。因此,提高其刚度成为提高珩磨加工的磨削效率与加工精度的重要途径。本文基于Φ450mm双进给珩磨头为研究对象,对其粗珩部分建立受力分析方程,确定在其结构中不同参数对传力效果的影响情况。进而建立三维模型,利用有限元分析软件对其各零件及其接触部分进行分析,确定各部分对整体刚度的影响。根据分析结果,大顶杆与大锥体接触部分结构由于接触面过小导致存在刚度不足,本文对其结构重新设计,并利用参数优化得出了各尺寸最佳参数;对大锥体锥角进行分析,根据锥角与传力的关系得出合适的角度;对粗珩油石座推杆与大锥体接触部分进行接触分析,并对接触部分结构进行优化,得出前后倒角的最佳参数;最后,对粗珩油石座支撑部分的分析结果表明,四杆支撑结构中必存在一个最优支撑分布,在不改变支撑杆数量情况下可以有效改善油石座变形不均匀问题。对优化完成后的珩磨头进行检验并与未优化时进行对比。在轴向方向,通过对大顶杆的优化,将轴向方向的变形降低了16.7%;在径向方向,通过改变油石座支撑位置,将油石座变形降低了20%。证明了通过对各接触部分进行优化,可有效提高珩磨头的刚度。
[Abstract]:With the development of economy in our country, the demand for cylinder liner of large diesel engine will increase further. Honing machine as the key equipment to process diesel engine cylinder liner will inevitably have higher demand. This demand is expressed not only in quantity, but also in higher performance requirements. Honing head as the tool of honing machine has great influence on the machining quality of honing machine. Among the factors affecting honing performance, stiffness is the most important factor. Therefore, improving its rigidity is an important way to improve the grinding efficiency and machining precision of honing. In this paper, based on 桅 450mm double feed honing head, the force analysis equation is established for the coarse honing part, and the influence of different parameters on the force transfer effect in the structure is determined. Then the three-dimensional model is established and the influence of each part on the whole stiffness is determined by using the finite element analysis software to analyze the parts and their contact parts. According to the analysis results, the stiffness of the contact part of the large top rod and the big cone is too small. The structure is redesigned in this paper, and the optimum parameters of each dimension are obtained by optimizing the parameters, and the conical angle of the large cone is analyzed. According to the relation between cone angle and transmission force, the proper angle is obtained. The contact analysis of the push rod and the contact part of the large cone is carried out, and the structure of the contact part is optimized to obtain the best parameters of the front and rear chamfer. The results of the analysis on the support part of the coarse honing pedestal show that there must be an optimal support distribution in the four-bar bracing structure, and the problem of non-uniform deformation of the stone pedestal can be effectively improved without changing the number of the supporting rods. The honing head after optimization is checked and compared with that without optimization. In the axial direction, the axial deformation is reduced by 16.7 by optimizing the large roof rod, and in the radial direction by changing the supporting position of the oil stone pedestal, the deformation of the stone pedestal is reduced by 20 percent. It is proved that the stiffness of honing head can be improved effectively by optimizing the contact parts.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG589

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