超高速数控精密磨床磁浮轴承主轴单元设计

本文介绍了磁浮轴承的优点，并提出了磁浮轴承作为磨床主轴轴承的设计方法。同时，首次提出了超高速数控精密外圆磨床磁浮轴承主轴单元设计方法和设计过程。并针对一台300m／s超高速数控精密外圆磨床磁浮轴承主轴单元进行了设计。经过实验证明，提出的设计方法是正确的。同时，应用了该技术的超高速数控精密磨床，虽然初期投资成本高，但其优越的使用性能使其综合效益高。     

HSK主轴/刀柄联结的非线性接触分析

借用先进的非线性有限元法 ,分析了配合面间的接触应力分布 ,讨论了旋转速度和过盈量对接触应力的影响。研究表明 ,按照 ISO标准制造的刀柄和主轴间的过盈量不足 ,HSK- A63主轴 /刀柄联结的最佳过盈量为1 3～ 1 8μm。研究结果为设计和优化 HSK主轴 /刀柄联结提供了理论参考。     

加工中心主轴准停常见故障诊断与维修

以实例的形式给出加工中心主轴准停装置几种常见的故障现象,并说明维修排障的具体方法,对加工中心的实际维护与维修具有指导意义.     

三角轴数控加工试验

对三角轴靠模加工方法进行了分析，建立了正确的数学模型，在此基S出上，在XK5040数控铣床上进行了加工试验，获得了满意的廓形效果，这项成果对改进联接性能及提高联接件的质量有十分重要的意义。     

FLOW STRESS DATA FOR FINITE ELEMENT SIMULATION IN METAL CUTTING: A PROGRESS REPORT ON MADAMS

To obtain reliable results from Finite Element (FE) simulation of machining processes, it is necessary to have as input the properties of the workpiece and tool materials as well as the characteristics of the tool/chip interface. These input parameters include physical and thermal data, friction and heat transfer, and most importantly the flow stress of the workpiece material under high strain, strain rate and temperature conditions that exist during the process. This paper presents a brief review of FE simulation of machining processes, a review of the approaches used to determine the flow stress at high deformation rate, and the examples of different constitutive equations used to represent such flow stress data. A material property database (MADAMS) has been developed and provides useful information to conduct simulations of machining processes. The main objectives of the material database are to assist researchers in areas of machining analysis and material modeling and to promote collaboration between various international research groups.     

玻璃孔加工的试验研究

研究了电镀金刚石工具结构和加工参数对玻璃孔加工质量和加工效率的影响。试验结果表明，在电镀金刚石工具端部开槽，可获得小的玻璃爆边直径和高的材料去除率。冷却方式影响玻璃孔的加工质量，主轴转速和配重载荷影响玻璃孔的加工效率。     

工程陶瓷的新加工方法

工程陶瓷材料具有耐高温、耐腐蚀、抗磨损及抗热冲击等优点。但由于硬度高、脆性大、大多数陶瓷材料不导电，传统的机械加工方法难以加工，使用范围受到限制。近年来，高压磨料水射流这种新兴的加工工程陶瓷的方法越来越受到人们重视。它具有效率高、成本低等优点，并可以加工出形状复杂的产品。     

Efficiency Measures of Process Plans for Machined Parts

This paper presents an overview of the authors’ rooted tree technique for process planning. The overview provides the foundation for the main part of the paper, which explains how the rooted tree can be used to develop efficiency measures of process plans. The efficiency measures are determined by comparing an actual tree and its subgraphs with an "ideal" tree. The "ideal tree" is one that minimises the number of manufacturing operations. The paper proves that the "ideal tree" is a directed design dimension graph plus one operation. Three measures of efficiency are presented: finishing efficiency, preforming efficiency, and overall efficiency. The practical value of the efficiency measures is demonstrated by presenting measures of plans for four industrial parts. It is also argued that the efficiency measures provide a quantitative assessment of process plans that can be used to improve them and manufacturing technology.     

Proposal of disturbance-compensating and energy-saving control method of air turbine spindle and evaluation of its energy consumption

This paper introduces a disturbance-compensating and energy-saving control method of an air turbine spindle equipped with a rotation control system designed for use in ultra-precision milling. As one of the key components, our proposed pneumatic regulating device, called a high-precision quick-response pneumatic pressure regulator (HPQR), is used to control the air supply pressure of the air turbine spindle precisely and quickly. The rotation feedback control system including the HPQR and a disturbance force observer, which avoids changes of rotation speed due to disturbance forces applied to the air turbine spindle, is explained. In addition, a pneumatic energy assessment method using a device called an “air power meter” is explained. The effectiveness of the proposed method is demonstrated through the experimental results.     

Laser Ablation and Laser-Hybrid Ablation Processes: A Review

Laser beam machining (LBM) has proven its applications and advantages over almost all the range of engineering materials. It offers its competences from macro-machining to micro- and nano-machining of simple-to-complex shapes. The hybrid approaches in laser ablation have demonstrated much improved results in terms of material removal rate, surface integrity, geometrical tolerances, thermal damage, metallurgical alterations, and many more. The flipside of LBM is the existence of universal problems associated with its thermal ablation mechanism. In order to alleviate or reduce the inherent problems of LBM, a massive research has been done during the past decade in order to build a relatively new route of laser-hybrid processes. This paper reviews the research work carried out so far in the area of LBM and its hybrid processes for different materials and shapes. The article also highlights the research gaps and future research directions in the context of laser and laser-hybrid ablation.