对削

Tool paths, and working procedure effecting machining residual stress as well as the law of its releasing were analyzed systemically by using three-dimensional Elasto-plastic FEM, which can optimize the tool paths and make the working procedure more rational.In the course of FEM simulation, the birth-death element arithmetic was introduced into simulating material remove, and the kinetic Load-step was used to simulated tools work.

第四，在上述研究的基础上，利用三维弹塑性有限元技术系统地分析了铣削力要素下铣削加工中走刀路径对已加工表面残余应力分布状态的影响规律以及铣削加工工序间残余应力的相互影响规律，为优选出较为合理的走刀路径和加工过程中安排去应力工序提供指导。

Based on the foregoing analysis, the critical condition of realizing ductile/brittle transform is confirmed, and then, the model of ductile grinding of engineering ceramic is built.

以陶瓷材料压痕断裂力学、线性断裂力学和微观断裂物理学为理论基础，系统的分析和讨论了磨削加工过程中微裂纹的产生机理及其影响因素，建立了裂纹分布模型，并根据位错产生微裂纹机制，对磨削过程微裂纹的形成采用位错塞积模型来描述，从能量平衡的角度，讨论位错裂纹的稳定性与磨削应力的关系，确定了材料脆性去除和塑性去除转换的临界条件，最终建立以此为基础的工程陶瓷材料延性域去除模型。

The maximal depth model for single-pass milling process, the depth and surface roughness for plane surface are established. The milled profile of a single-pass milling of the jet can be modeled as a cosine curve of the form. Therefore, the maximal depth model for single-pass milling is established which indicates the quantitative relationship between the AWJ single-pass milling depth and the milling parameters.

假设磨料水射流单次铣削时的工件横截面形状为余弦曲线，建立了磨料水射流单次铣削的最大深度模型，分析了水射流压力、磨料流量、靶距、喷嘴横移速度、横向进给量和喷嘴直径及材料性能参数对单次铣削最大深度的影响规律。

This paper mainly researches high speed milling TC4 and discusses the problem about cutting force during the process of high-speed milling.

着重讨论了钛合金TC4高速铣削过程铣削力的问题，研究了切削参数、刀具磨损及刀具材料等对铣削力的影响。

As to the evaluation to the machining performance, more attentions have been paid on the wearability and removal rate of the brazing grinding tools.

并且在对加工效果的评价时，更多的是注重磨削工具的耐磨性和切除率，较少注意对磨削过程的监测和磨削机理的研究。

In this thesis, experimental investigations have been done on temperature and energy partition and wheel wear in grinding with a vitrified CBN wheel.

本文对使用陶瓷结合剂CBN砂轮的磨削温度、热量分配比例以及砂轮磨损进行了试验研究，论文的主要结果如下：(1)对陶瓷结合剂CBN砂轮磨削温度的试验结果表明，陶瓷结合剂CBN砂轮的磨削温度很低，这主要是由于CBN磨料具有优良的导热性能。

The main content included in the paper is as follows: The European identification methods of type of wave load is introduced and compared with the methods in Code of Hydrology for Sea Harbour. In order to reveal their difference, they are tested by the experiment data. The relation between phase and frequency are analysed through the Hilbert and wavelet transformations. And a new method of identifying the breaking wave load is set up based on the linear relation between wave height and wave press before the breakwaters. The probability distribution is tested by the statistic of experiment data. Based on the experiment data, the paper analysed the influence of reflection coefficient according to different factors, and its property is got. The work property of charmfered breakwater under breaking waves is analysed. Through the statisticof its wave press and wave force the distribution of press on the breakwater front face and its reducing effect to breaking wave force are proved.

本文基于此，通过实验研究，主要作了如下工作：介绍了欧洲波态划分方法，分析与我国方法的异同，通过实验进行了验证；通过 Hilbert 变换和小波变换对波浪破碎的相频特性进行了分析，通过建立波高与波压关系来判别破碎波浪力；对破波条件下波浪力的分布进行了统计研究，验证了其分布类型；利用实测资料，分析了不同因素对反射系数的影响，得出了不同周期、波浪要素、破碎率下反射系数体现的不同规律；分析了破碎波作用下削角堤的工作特性，通过对堤面所受的波压力和总力的统计分析，验证了压强分布规律及削角堤对波浪力的削减作用。

Through improving the geometric parameters of the cemented carbide bit such as the rake angle of main cutting edge,outer fringe cusp and chis...

通过对钻削加工用硬质合金钻头的几何参数进行改进，主要是对主切削刃前角、外缘转点以及横刃进行改进，达到降低钻削功率的目的，同时，利用多元线性回归理论，得出基于实验数据的多元回归钻削功率的数学模型，从理论上证明此次刀具改进的有效性。

The pick_up and analyse for parts data have been made and craftwork decision has been made. Profile calculations for turning parts and islands and islets for milling parts problem in mould cavity have been especially made. Post process for turning parts and milling parts have been realized. The cutter locus file has been made.

通过对零件数据的提取、分析及工艺决策，深入研究了车削类零件的轮廓计算和铣削类零件型腔中岛屿问题的处理方法，实现了车削、铣削零件的前置处理，形成刀位文件，并生成了相应的零件工艺卡。

Over the analysis to grinding methods of mould core in reflecting cover of lamps with paraboloid, the thinking on developing professional grinding tool is provided, and the grinding track of paraboloid with scale distribution on surface is calculated.

通过对抛物面反射罩模具型芯磨削方法的分析，提出了研制专用磨削机床的设想，并对表面有鱼鳞块分布的抛物面磨削轨迹进行了计算。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。