机床导轨面缺陷修复技术的分析

通过对机床导轨面缺陷修复的几种传统焊补方法的介绍及对各种方法不同特点的分析,确定机床导轨面缺陷修复局限性的存在原因.同时,对一种新出现的铸造缺陷修复技术及其设备铸造缺陷修补机,进行了实践操作实验和试棒的显微组织分析,说明用铸造缺陷修补机修复机床导轨面缺陷是符合质检标准的,证明了缺陷修补机在铸件缺陷修复方面是值得推广的一项新技术.     

C机能二维刀补的计算机图形仿真

提出了一种采用计算机图形仿真来检验数控加工程序中刀具补偿代码正确的方法，利用VC＋＋6．0开发了相应的数控程序仿真软件，并就如何读取数控程序，分析数控代码的问题做了一些探讨。     

模具钢淬火裂纹产生机理及预防措施

介绍模具钢淬火后易产生的几类裂纹,并着重分析了各类裂纹产生的原因及其预防措施。     

EFFECT OF TOOL WEAR ON MICROSTRUCTURE, MECHANICAL PROPERTIES AND ACOUSTIC EMISSION OF FRICTION STIR WELDED 6061 Al ALLOY

Tool condition is one of the main concerns in friction stir welding （FSW）, because the geometrical condition of the tool pin including size and shape is strongly connected to the microstrueture and mechanical performance of the weld. Tool wear occurs during FSW, especially for welding metal matrix composites with large amounts of abrasive particles, and high melting point materials, which significantly expedite tool wear and deteriorate the mechanical performance of welds. Tools with different pin-wear levels are used to weld 6061 Al alloy, while acoustic emission （AE） sensing, metallographic sectioning, and tensile testing are employed to evaluate the weld quality in various tool wear conditions. Structural characterization shows that the tool wear interferes with the weld quality and accounts for the formation of voids in the nugget zone. Tensile test analysis of samples verifies that both the ultimate tensile strength and the yield strength are adversely affected by the formation of voids in the nugget due to the tool wear. The failure location during tensile test clearly depends on the state of the tool wear, which led to the analysis of the relationships between the structure of the nugget and tool wear. AE signatures recorded during welding reveal that the AE hits concentrate on the higher amplitudes with increasing tool wear. The results show that the AE sensing provides a potentially effective method for the on-line manitoring of tool wear.     

镀附钛、钼、钨金刚石与铜基合金结合剂工具的结构性能研究

为了实现金刚石与金属结合剂间的冶金结合,本文用镀Ti、Mo、W的金刚石与含Ni、Co的铜基合金结合剂制成了刀头,通过切割试验和抗折试验,研究了其强度特征和切割性能,并用X射线、扫描电镜和能谱分析对镀层和金刚石、结合剂之间的作用进行了微观分析。结果表明:Ti、Mo、W镀层一方面与金刚石发生界面化学反应形成相应的碳化物,另一方面又与金属结合剂形成化学键合并部分溶入结合剂液相中。这样,由Ti、Mo、W镀层的中介作用实现了铜基金属结合剂与金刚石之间的冶金结合,使金刚石工具的性能大幅度提高。     

机床热变形产生的原因及常用控制方法

机床热变形是机械制造业中常见的一种不正常现象，会降低零件的加工精度。减少机床热变形的方法为：进行热误差建模和补偿，温度控制，热态特性优化设计。     

Mechatronic Systems for Machine Tools

This paper reviews current developments in mechatronic systems for metal cutting and forming machine tools. The integration of mechatronic modules to the machine tool and their interaction with manufacturing processes are presented. Sample mechatronic components for precision positioning and compensation of static, dynamic and thermal errors are presented as examples. The effect of modular integration of mechatronic system on the reconfigurability and reliability of the machine tools is discussed along with intervention strategies during machine tool operation. The performance and functionality aspects are discussed through active and passive intervention methods. A special emphasis was placed on active and passive damping of vibrations through piezo, magnetic and electro-hydraulic actuators. The modular integration of mechatronic components to the machine tool structure, electronic unit and CNC software system is presented. The paper concludes with the current research challenges required to expand the application of mechatronics in machine tools and manufacturing systems.     

数控程序的高效设计及其刀具轨迹优化

介绍了提高数控程序编制效率的途径 ,并以实例说明了如何对数控程序刀具轨迹的质量进行优化 ,对从事数控工艺与编程的技术人员有参考和借鉴的作用。     

多体系统理论在数控加工精度软件预测中的应用

基于多体系统理论和虚拟加工技术的基本原理,阐述了多体系统的特征矩阵,研究了数控机床刀具成形函数和空间误差模型,提出和分析了机床加工精度软件预测的建模方法,最后为了验证所述精度预测方法的有效性,进行了软件预测和实体加工的加工精度比较实验.     

Algorithms to support point-based cadcam

This paper presents a system that supports a point-based approach to CADCAM that was first suggested by McLaughlin. The core to the approach is the ability to interpolate a grid of points in a geometrically meaningful way that does not suffer from the disadvantages of the standard interpolation schemes based on NURBS. The essential features of the approach are based on recursive subdivision between existing points to generate intermediate points that are consistent with a smooth curvature profile. There are many advantages to this approach. Time-consuming surface fitting is not necessary; there are no problems with ensuring continuity between surfaces; data exchange can be carried out exactly. By chosing to work entirely with points, all of the standard interrogations available in CAE systems, including visualisations, FE analysis and NC machining, which are dependent on NURBS curves and surfaces have to be replicated. The feasibility of the point-based approach is illustrated by showing how geometric interrogations and machine tool paths can be accurately generated using just points.