浅析两种夹具在轮毂加工中的应用

车床的夹具影响机械加工质量,研究夹具对改善产品质量、提高生产效率是必要的.文章就扇型组合夹具和中心孔定位的指型夹具这两种夹具在实际生产中的应用特点及对产品质量的影响进行理论分析和试验分析,并用统计过程控制的方法进行科学地验证.分析结果表明,扇型组合夹具通用性强、成本低,而中心孔定位夹具加工出来的产品质量高.     

宏指令编程在函数方程曲线加工中的应用

讨论了应用宏指令编程的普通数控机床上准确加工函数方程曲线的方法；给出了几种相应的算法和一个编程实例。该方法大大简化了此种零件加工程序的编制，经华中Ⅰ型数控铣床实际应用，效果良好。     

数控加工模具型腔中的数据处理

模具型腔在数控加工中需要一套控制刀具运动轨迹的算法，本文给出了从模具型面的几何描述，加工数据的生成到形成Ｇ格式指令进行数控加工这一生产过程的数据处理，实验和现场加工的结果表明：该数据处理算法成功地解决了模具型面的加工制造问题。     

第十一届中国国际模具技术和设备展览会现代模具制造技术及设备评述

通过对第十一届中国国际模具技术和设备展览会中模具加工技术以及关键设备、刀具、测量仪器、模具的C如／CAE／CAM技术等的水平评述，介绍了现代模具制造技术的现状、特点和发展趋势。     

Development of new-concept desk top size machine tool

A desktop multiprocess machinery has been designed that has two concepts: miniaturizing of machine tool and multiprocessing with a same machine tool. The prototype of desktop multiprocess machinery is developed in this study. This is tabletop size machine tool that has five changeable machining heads. Outline of main body and machining head are presented.In order to know the basic accuracy of desktop multiprocess machinery, experimental evaluation is carried out. Machining head setting error, stiffness of multiprocess machinery and straightness of X, Y, Z stage is measured. To study the basic performance of desktop multiprocess machinery, a complex machining experiment is carried out with the developed machine tool. The complex machining consists of three steps: electrode machining by milling, hole shaping by EDM, and hole finishing by ECM. These steps are performed in sequence on the same machine tool. The complex machining is successfully carried out. In order to evaluate the desktop multiprocess machinery from environmental point of view, machining energy, volume of machining liquid, and installation space of desktop multiprocess machinery are measured. The measured values are compared with estimated values with conventional machine tools. The machining energy, the volume of machining liquid, and the installation space of desktop multiprocess machinery are smaller than those of conventional machine tool.     

Analytical and experimental study of shear localization in chip formation in orthogonal machining

A simplified theory of instability of plastic flow is applied to analyze the formation of shear localized chips in orthogonal machining. A flow localization parameter is expressed in terms of associated cutting conditions and properties of the workpiece material. The analysis, which indicates the important parameters in the cutting process, is used to investigate the effect of cutting conditions on the onset of shear localization and the formation of adiabatic shear banding in metal cutting. Comparisons are made between the analysis and experiments in which the flow localization parameter is obtained for several workpiece materials. The results of this investigation seem to support the analysis and its potential benefits in analyzing and/or remedying problems associated with chip formation and temperature generated in metal cutting. Presently at Advanced Technology Center, Valenite, Inc., Madison Heights,MI 48071, USA     

Studies on electric-discharge machining of non-contact seal face grooves

In this paper, the electric-discharge machining (EDM) of non-contact seal grooves was studied. Two types of material, namely: tungsten carbide and silicon carbide were tested by EDM due to their hard machining behaviors. The geometry of seal grooves is another reason why grinding or other precision machining processes cannot be applied. Four parameters of EDM processes were studied, namely: electrode material, pulse duration, discharge current, and polarity. According to experimental results, the optimal process parameters were obtained based on the specimen’s qualities, such as surface roughness and depth of cut. An industrial example was also studied in the final stage of the proposed paper.     

The form error prediction in side wall machining considering tool deflection

In this research, an effective method for the form error prediction in side wall machining with a flat end mill is suggested. The form error is predicted directly from the tool deflection without surface generation by cutting edge locus with time simulation. The developed model can predict the surface form error accurately about 300 times faster than the previous method. Cutting forces and tool deflection are calculated considering tool geometry, tool setting error and machine tool stiffness. The characteristics and the difference of generated surface shape in up milling and down milling are discussed. The usefulness of the presented method is verified from a set of experiments under various cutting conditions generally used in die and mold manufacturing. This study contributes to real time surface shape estimation and cutting process planning for the improvement of form accuracy.     

数控高效放电展成加工技术

较详细地介绍了数控高效放电展成加工技术,采用简单超长圆电极,通过计算机控制电极与工件的相对运动并对电极损耗进行在线检测和补偿,展成加工复杂形面的特殊材料的零件.电、机结合达到对难加工特殊材料的高效、高精度的展成加工.     

汽车覆盖件模具CAM工艺技术的研究

论述了汽车覆盖件模具计算机辅助制造工艺中的一些关键技术 ,如CAM与CAD数据转换和处理,合理加工工艺方案的拟定,走刀路线的优化,加工工艺技术参数的确定等 ,并论述了数控加工中先进工艺方法的应用