曲轴圆角滚压强化工艺研究与数控系统设计

【作者】 刘荣昌；

【导师】 薛隆泉；

【作者基本信息】 西安理工大学 ， 机械设计及理论， 2001， 硕士

【摘要】 曲轴圆角滚压强化工艺是目前最为理想的圆角表面强化方法，该方法不仅能够显著提高曲轴的疲劳寿命，而且，在参数选择合理、润滑条件良好的前提下，可获得较好的表面加工质量。经滚压加工后的圆角不必精磨，就可以满足表面质量要求，从而有利于提高生产率和降低加工成本。本论文针对N4850Q曲轴圆角滚压专用机床设计中的一些问题进行了较深入、全面的理论分析和研究。 通过对切向滚压圆角的运动学分析，建立了滚压加工工艺参数优化设计的数学模型，并编制了相应程序，设计出了N4850Q曲轴滚压工艺参数，本论文为滚压加工提供了一种实用的工艺参数选取方法。 应用当量圆柱理论，建立了滚压加工接触问题的力学模型，对滚压中的塑性变形进行了讨论，制定了滚压力计算的基本步骤，对N4850Q曲轴圆角滚压进行了滚压力计算。 本论文首次将力学状态图引入接触问题，对接触表面下的应力状态进行了分析，并对工程中接触表面下塑性变形与破坏的原因从理论上进行了证明；对滚压加工中摩擦力产生的机理进行了初步研究，提出了滚压加工摩擦力近似计算的方法。 立足于上述理论，本论文对N4850Q曲轴滚压专用机床设计中的与滚压有关的一些参数进行了设计，并进行了功率计算和曲轴轴向变形量预测。 最后本论文还对N4850Q曲轴滚压专用机床数控系统进行了总体设计，对其数控方法进行了研究，拟定了曲轴加工程序单，为数控系统的软、硬件设计奠定了基础。更多还原

【Abstract】 Research on Rolling Process for Strengthening CrankshaftChamper and Design on the Numerical Control SystemThe rolling process for strengthening crankshaft champer is thebest way to strengthen the surface of crankshaft champer at the presenttime. By this way, the fatigue life-span of crankshaft would increaseobviously, furthermore, the good quality of surface can be acceptedafter the rolling process if the choosed parameters are rational and thelubrication is good, the rolling champer can meet to the require ofthe surface quality and does not need to be ground finely, thus,this Process is propitious to enhance the productivity and reduce thefinal cost.In this paper, the throughout and overall studying on it iscarried out.The optimal mathematical model of rollers’ tangential cuttingchamper is established on the basis of kinematic analysis of champerrolling machining, and the software about it is worked out to designrolling parameters of N4850Q crankshaft.This paper offers a practicalmethod to select the rolling process parameters.This paper applies the theory of comparative cylinders and thus themechanical model of the rolling touch issue is established. Also, theplasticity deformation in rolling process is discussed, the necessarysteps is scheduled. Through all these way, the total strength in N4850Qcrankshaft rolling is calcullated.Ths paper applys the stress-state-chart into contact issue for thefirst time, and proves the exiting plasticity under the contact surfacefrom the theoretic angle. Based on the analysis of stress under thecontact surface, the mechanism of the friction is studied elementarily, and thus, the approximate formula of the force from friction is putforward.Established in above theory, the parameters related to rol1ingProcess in the design of the special rolling machine tool for N4850Qcrankshaft and the deformation through the axes is divined.Finally, in this paper,the panoramic design on numerical control inN4850Q crankshaft ro1ling machine tool is laid out, the numericalcontrol plan is studied and the procesure 1ist is studied out infavorof the design of software and hardware in numerical control system.更多还原