Theoretical analysis and experiments on bearing race show that a suitable residual compressive stress on roll path of bearing race can prolong its contact fatigue life. However, residual tensile stress is often found on workpiece surface of bearing race. To actively control the residual stress state and improve fatigue life of bearing part, a new method of pre-stress hard cutting is applied. In this paper, the principle of pre-stress hard cutting for bearing race is introduced as well as the experiments on it. In the experiments, residual stress, hardness and roughness of machined surface are measured and analyzed. Moreover, micro-topography and texture characteristics of machined surface are investigated and experimental results are compared with that by grinding. It is found that we can get residual compressive stress and fine quality on machined surface of bearing race by pre-stress hard cutting and increase its productivity as well.

The analysis on load characteristics and stress state of bearing races shows that the roll path and outside layer of a bearing race are the main part to bear the load, and that residual tensile stress is often found on workpiece surface. For the purpose of improving residual stress state on machined surface of a bearing race, a method of pre-stress hard cutting is put forward. In this paper, the principle of pre-stress cutting is introduced, and method of loading stress on bearing races, together with the calculation for pre-stress, is analyzed. A set of device with expanding mandrel for realizing the process is designed too and an experiment of pre-stress cutting is carried out on a lathe with PCBN tool. The experimental results show that, by using this method, we can get residual compressive stress on machined surface layer of a bearing race and increase the quality and contact fatigue life of bearing.

Gearlike cylindrical structure can be used as outer ring of linear bearing for saving material, but the machined surface quality and roundness of this kind of bearing is beyond control in cylindrical grinding and machining efficiency is low. To solve these problems, a new method of pre-stress grinding for gearlike cylindrical surface of linear bearing is put forward based on analysis on the principle of cylindrical centerless grinding. For implementing this process, a set of device with expanding mandrel for loading tensile pre-stress on bearing ring is designed and experiment of through-feed grinding is carried out on centerless grinder. The experimental results show that this method can get fine quality of machined surface and increase the grinding efficiency greatly.

In this article, the micro-topography and texture characteristics of machined surface under the condition of high speed cutting are analyzed based on experimental observation. The forming process of machined surface and cause of the appearance are also discussed. The experimental results show that furrow and ridges, surface white layer and molten metal daub by the feed motion of cutting tool are found on machined surface due to the effect of high cutting temperature and rotating of workpiece in high speed turning process.

The forming process of serrated chip in high speed cutting for steel is analyzed based on experimental observation. The cause of serrated chip forming in high speed cutting process is the multiple effects of high cutting heat and strain rate. The shear deformation is concentrated in a narrow band and results in a shear localization. In this article, the forming mechanism of serrated chip is analyzed in accordance with the SEM photograph and metallographics got from experiment.

SiC particle-reinforced aluminum matrix composites (SICp/Al) is a kind of hard to cut material with excellent physical and mechanical performances. In order to solve the problem of tool wear rapidly and bad of machined surface quality in cutting, a new type carbide tool with guiding and finishing land was designed by analyzing on the forming mechanism of machined surface and state of tool wear in this paper. Experimental results show that tool life and quality of machined surface are improved significantly by using this new type tool.

The problem for adjusting heating current in Electric Hot Machining is how to detect the change of cutting condition. In this paper, Cutting state resistance has been proposed as a state parameter for self-adjusting heating current in EHM. An investigation on the relationship between this parameter and cutting conditions has been carried out. The experimental results show that cutting state resistance can rapidly respond the change of cutting state and optimum control of heating current can be realized in electric hot machining by means of detecting this resistance.

基于密度法，提出了将结构力学中的拓扑优化思想应用于热传导散热结构的优化设计，建立了热传导问题的散热结构拓扑优化数学模型，推导了热传导最佳散热结构拓扑优化设计的优化准则算法；并应用基于卷积的滤波技术处理计算过程中密度场，消除数值计算不稳定性；数值算例验证了本文理论、思想和算法的正确性、有效性；该算法研究为温度场结构优化设计提供了一种新的思路和方法，具有一定的工程应用价值。

本文开发了适应在线检测需要的精密轴承外径机器视觉检测系统。简明、精确的标定方法、高效精确的图像处理算法（如亚像素边缘定位）使检测系统达到了较高的精度。检测结果表明，系统具有非接触、速度快、精度高、现场抗干扰能力强等优点。

为提高机械工程图三维重建的实用性，该文以实际工程图为重建对象，提出了基于机器理解的机械工程图三维重建的新方法。该方法具有以下特点：1）利用机械工程图蕴涵的工程语义信息，引导对基元特征操作参数信息的识别；2）通过“假想与确定”的重建机制，对不同的基元特征采用不同的重建方法；3）为进一步提高实用性，采用集成的重建技术扩展重建对象的形体覆盖域；4）将已重建基元扩充入模式库，建立自学习机制，提高系统的重建效率和应用范围。实验结果表明，该方法具有较好的实用性。