【摘要】：隨著我國經(jīng)濟的不斷發(fā)展,對于大型柴油機缸套的需求也會進一步增加。珩磨機床作為加工柴油機缸套的關(guān)鍵設(shè)備必然會出現(xiàn)更高的需求。這種需求不僅表現(xiàn)在數(shù)量上,同時會表現(xiàn)在對性能提出更高的要求。珩磨頭作為珩磨機床的刀具,其工作性能對于珩磨機床的加工質(zhì)量影響很大。影響珩磨頭工作性能的各項因素中,剛度對其影響最大。因此,提高其剛度成為提高珩磨加工的磨削效率與加工精度的重要途徑。本文基于Φ450mm雙進給珩磨頭為研究對象,對其粗珩部分建立受力分析方程,確定在其結(jié)構(gòu)中不同參數(shù)對傳力效果的影響情況。進而建立三維模型,利用有限元分析軟件對其各零件及其接觸部分進行分析,確定各部分對整體剛度的影響。根據(jù)分析結(jié)果,大頂桿與大錐體接觸部分結(jié)構(gòu)由于接觸面過小導致存在剛度不足,本文對其結(jié)構(gòu)重新設(shè)計,并利用參數(shù)優(yōu)化得出了各尺寸最佳參數(shù);對大錐體錐角進行分析,根據(jù)錐角與傳力的關(guān)系得出合適的角度;對粗珩油石座推桿與大錐體接觸部分進行接觸分析,并對接觸部分結(jié)構(gòu)進行優(yōu)化,得出前后倒角的最佳參數(shù);最后,對粗珩油石座支撐部分的分析結(jié)果表明,四桿支撐結(jié)構(gòu)中必存在一個最優(yōu)支撐分布,在不改變支撐桿數(shù)量情況下可以有效改善油石座變形不均勻問題。對優(yōu)化完成后的珩磨頭進行檢驗并與未優(yōu)化時進行對比。在軸向方向,通過對大頂桿的優(yōu)化,將軸向方向的變形降低了16.7%;在徑向方向,通過改變油石座支撐位置,將油石座變形降低了20%。證明了通過對各接觸部分進行優(yōu)化,可有效提高珩磨頭的剛度。
[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.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TG589

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本文編號：2137474