發(fā)布時(shí)間：2018-07-22 12:32

【摘要】：隨著我國(guó)經(jīng)濟(jì)的不斷發(fā)展,對(duì)于大型柴油機(jī)缸套的需求也會(huì)進(jìn)一步增加。珩磨機(jī)床作為加工柴油機(jī)缸套的關(guān)鍵設(shè)備必然會(huì)出現(xiàn)更高的需求。這種需求不僅表現(xiàn)在數(shù)量上,同時(shí)會(huì)表現(xiàn)在對(duì)性能提出更高的要求。珩磨頭作為珩磨機(jī)床的刀具,其工作性能對(duì)于珩磨機(jī)床的加工質(zhì)量影響很大。影響珩磨頭工作性能的各項(xiàng)因素中,剛度對(duì)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(jìn)給珩磨頭為研究對(duì)象,對(duì)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(duì)傳力效果的影響情況。進(jìn)而建立三維模型,利用有限元分析軟件對(duì)其各零件及其接觸部分進(jìn)行分析,確定各部分對(duì)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(guò)小導(dǎo)致存在剛度不足,本文對(duì)其結(jié)構(gòu)重新設(shè)計(jì),并利用參數(shù)優(yōu)化得出了各尺寸最佳參數(shù);對(duì)大錐體錐角進(jìn)行分析,根據(jù)錐角與傳力的關(guān)系得出合適的角度;對(duì)粗珩油石座推桿與大錐體接觸部分進(jìn)行接觸分析,并對(duì)接觸部分結(jié)構(gòu)進(jìn)行優(yōu)化,得出前后倒角的最佳參數(shù);最后,對(duì)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(gè)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(wèn)題。對(duì)優(yōu)化完成后的珩磨頭進(jìn)行檢驗(yàn)并與未優(yōu)化時(shí)進(jìn)行對(duì)比。在軸向方向,通過(guò)對(duì)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(guò)改變油石座支撐位置,將油石座變形降低了20%。證明了通過(guò)對(duì)各接觸部分進(jìn)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(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG589

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本文編號(hào)：2137474