英语翻译A finite element model is proposed to simulate the preci

英语翻译
A finite element model is proposed to simulate the precision and ultraprecision grinding of steel and to describe the temperature fields developed during the process.The grinding is modelled using the commercial implicit finite element code MARC.In order to obtain the input data required for the model and to examine the heat damage induced to the workpiece,a series of experiments was performed with the same grinding conditions,but using different aluminium oxide grinding wheels of different bonding on the same work material.Comparison between numerical results obtained from the proposed model and experimental predictions,as well as numerical and analytical calculations reported in the literature,revealed a good agreement between theory and practice,indicating therefore that the model may be suitable .for industrial applications.
Keywords:Depth of cut; Finite element model; Thermal damage
1 .Introduction
The energy per unit volume of material being removed from the workpiece during grinding is very large.This energy is almost entirely converted into heat,causing a significant rise in the workpiece's temperature and,therefore,potential thermal damage.In order to elaborate this topic,extensive work has been performed pertaining to the modelling and simulation of grinding and,especially,to thermal modelling; models that can predict the temperature rise within the workpiece have been developed [1].Most of these thermal models are based on the early work by Jaeger,where the grinding wheel is represented by a heat source,equally distributed over the contact length between the workpiece and the grinding wheel,moving along the surface of the workpiece with a speed equal to the speed of the workpiece [2].A 2D model was used,with the grinding width large with respect to its length.However,this model is based on the assumption that the total grinding energy is entirely absorbed by the workpiece,whilst in reality the total grinding energy is distributed not only in the workpiece but also in the grinding wheel,the chip,and the coolant.A prediction of these energy components and the effect of cooling,along with the various assumptions made,related to the thermal properties of the workpiece material and the exact heat source profile have been made in order to improve the original model [3-6].The finite element method has been employed for modelling the grinding process,in order to achieve a greater accuracy and more reliable results [6,7].

一个有限元模型,模拟了精密和超精密磨削钢和描述的温度领域发展的过程中.磨削是仿照使用商业隐式有限元代码马克.为了获得输入所需的数据模型和研究的热损伤诱导的工件,通过一系列试验进行相同磨削条件,但使用不同的氧化铝砂轮不同粘接材料对同样的工作.比较计算结果获得该模型和实验的预测,以及数值计算和分析文献报道,显示了良好的协议之间的理论与实践,表明因此,该模型可以适用于工业应用.
关键词：切深热损伤；有限元模型；
介绍1.
能源每单位体积材料被删除从工件在磨削过程中是非常大的.这种能量是几乎完全转化为热能,造成了显着上升的工件的温度,因此,潜在的热损伤.为了阐述这一主题,大量的工作已经完成,有关的建模和仿真的磨削,特别是,热模拟；模型,可以预测的温度上升在工件已开发[ 1].大多数这些热模型基础上的早期作品,耶格,砂轮是由一个热源,同样分布在接触长度之间的工件和砂轮,移动沿工件表面的速度相当于工件转速[ 2].一个二维模型是用来与磨削宽度大,就其长度.然而,这种模式是基于这样的假设,总磨削能完全吸收的工件,而现实中总磨削能量分布不仅在工件而在砂轮,芯片,和冷却剂.预测能源组件和冷却效果,随着各种假设提出,与热性能的工件材料和确切的热源配置了以改善原模型[3].有限元方法已用于建模的研磨过程,以达到更高的精度和更可靠的结果[ 6 ,7].