多孔活定位冲裁新工艺

介绍了利用活定位的方法进行多孔冲裁的模具设计特点和生产工艺，经生产检验证明：产品质量达到了图纸要求，且模具结构简单，工人操作方便，灵活，生产效率大大提高，节省了机械加工工时，缩短了生产周期，解决了生产难题，经济效益显著。     

远程激光加工服务中心系统的研究与开发

概述了激光加工业的现状和市场特征，在比较了国内外远程制造的基础上，提出了一种基于Internet的远程湟加工服务中心系统模型，在此模型上建立了基于Web的服务中心信息管理系统，并论述了其关键技术，利用ASP技术及，DXF文件的特殊性实现了对二维板材加工的远程动态报价，同时也实现了用户认证，订单管理，商务洽谈，专家论坛等功能。     

螺纹盖注射模设计

分析了螺纹盖的成型特点，设计了螺纹盖注射模具。螺纹部分成型是关键环节，介绍了模具的分型机构和脱模方式，采用齿轮型芯，用齿轮传动来带动齿轮型芯转动实现分型，通过螺纹传动来脱模，同时，解决了1模多腔的难点，简化了模具结构，具有一定的推广价值。     

台车车轮铸造工艺的数值模拟及优化

利用V-Cast模拟软件，对车轮铸造的凝固过程进行了数值模拟，分析了原工艺产生缺陷的部位和原因。在此基础上，改进了浇注系统，优化了铸造工艺。模拟分析显示，新工艺实现了车轮的顺序凝固，消除了缩孔缺陷。生产实践表明，新工艺生产的车轮内部组织致密，满足其技术要求。     

利用数控回转头压力机冲切及成形大尺寸圆弧

通过不锈钢装饰板加工实例，系统介绍了数控回转头压力机的加工原理及工作过程。根据零件的结构要求，设计了数控回转头压力机成形圆弧模具，成形出产品要求在大圆弧上R25圆弧；针对内、外圆弧加工中出现的锯齿形棱角缺陷，绘制了零件加工原理图进行分析，找出了原因，通过构想新加工原理，设计了矩形母子模，克服了冲切内、外圆弧的加工缺陷，提高了材料利用率，保证了零件形状及精度要求；由此熟悉了进口模具，实现了模具国产化。     

一种新的变轴数控机床标定方法

本文论述了国内外并联数控机床所采用的标定方法，选择了序列法进行了标定试验。但在实际标定过程中，出现了部分数据误差较大的问题，本文针对所面临的问题，提出了数值逼近法，并应用到实际机床的标定中，获得了机床的相关参数。之后，通过数学模型的计算值和实际测量值对比，验证了数据的可靠性，从而验证了方法的可行性和正确性。     

摩托车后挡泥板冲孔模

分析了摩托车后挡泥板的冲孔工艺，着重介绍了摩托车后挡泥板冲孔模的结构。该模具布局合理，结构紧凑，提高了生产效率，降低了生产成本，从而降低了摩托车的造价，提高了摩托车的市场竞争力。     

IGBT弧焊逆变器快速控制系统

在研制ＩＧＢＴ弧焊逆变器过程中，根据控制理论，分析了电弧焊中各种过渡过程的特点，提出了对逆变器系统设计的要求，利用输出电流的反馈取样，高效滤波，超前较正等措施，获得了具有良好抗扰性及跟随性的弧焊逆变器快速控制系统。有效的抑制了开关器件瞬态过流的产生，提高了整机可靠性，获得了优异的工艺性能。     

树形神经网络的学习机理及其在电液伺服系统控制中的应用

针对具有多维输出信息的系统，采用了一种树形神经网络的构造方法，并解释了其物理意义。此外，本文还提出了该网络的一种新的训练结构，与传统的训练方法相比，保证了系统的稳定性与安全性，加快了网络的收敛速度，避免了训练过程中的虚收敛点，同时提高了神经网络的在线学习和实时控制性能。最后给出了针对电液伺服系统的仿真结果。     

电磁换向阀端盖高频感应钎焊设备研制及工艺探讨

本文介绍了电磁换向阀两端盖高频感应钎焊设备及工艺。分析了高频感应钎焊电磁换向阀的工艺特点，设计了加热迅速，均匀，工作可靠的感应器，并采用磁场凝聚器成功地减少了能量的损失，防止工件过热，提高了加热效率，研制的钎焊工作台结构合理，自动化程度高。     

Geometrical modification of coated carbide inserts for improved performance in high production face milling

The role of some geometrical modifications of coated carbide inserts on the improvement of their performance in high production face milling has been investigated.

The principal geometrical features investigated were:

1. (i) edge-bevelling for controlled contact cutting effects, higher edge-strength and better heat dissipation;

2. (ii) intermediate cutting edge for higher tip-strength and better heat dissipation;

3. (iii) wide planishing edge for good surface finish.

The role of these different geometrical parameters of the inserts on cutting forces, wear and surface finish in machining low carbon steel has been studied. Some benefits of edge-bevelling have been observed. Mathematical relationships for the cutting forces have also been developed.     

Microstructure and mechanical properties of spot welded Al–5·5Mg–0·3Cu alloy

Abstract

The influences of spot welding on the microstructure and mechanical properties of an Al–5·5Mg–O·3Cu alloy have been investigated. Results showed that dendrites were formed with porosity and cracks in the nugget. Grain boundary melting occurred in the heat affected zone and wide grain boundaries appeared. The alloy exhibited low hardness in the nugget centre. Tensile cracks propagated at the edge of the nugget and mixed rupture with dimples and intergranular fracture occurred. Fatigue fracture initiated at the edge of the nugget and propagated perpendicularly to the tensile axis. Transgranular fracture with striations was also observed.     

开卷线切边机设计中几个问题的探讨

对切边机剪切力计算公式的正确应用及影响剪切力的因素进行了讨论.探讨了设计切边机时必须充分重视的几个主要参数.指出了切边机结构的主要发展方向.     

Ground state of the magnetization of nanowires

Analytical and numerical methods have been used to study the ground state of magnetization of a nanowire consisting of ferromagnetic crystallites that are coupled via exchange interactions. The random nature of the field of crystallographic anisotropy has been taken into account. It is shown that the magnetization of a nanowire is divided into weakly interacting regions of magnetization called blocks. Such characteristics, as the average size of a magnetic block, its effective anisotropy constant, and their dependence on the size of crystallites have been calculated analytically and simulated numerically in a two-angle approximation. The coordinate dependences of the magnetization dispersion at the edge and in the bulk of the magnet have been determined. It is shown that the functional dependence of the dispersion on the coordinate changes with moving away from the free edge of the nanowire.     

Influence of the cutting edge rounding on the chip formation process: Part 1. Investigation of material flow, process forces, and cutting temperature

In order to meet the ever-increasing demand for high quality and low cost products, machining processes with geometrically defined cutting edges such as high speed cutting, or hard turning are being used. Due to the fact that cutting is accomplished through a physical interaction between the cutting edge and the workpiece, the characteristics of the cutting edge itself play a key role in influencing the machining process, which determines the product quality and the tool life. As a result, cutting edge design has attracted the focus of many researchers, and crucial improvements have been achieved. Rounded cutting edges have been found to improve the tool life, and the product quality. However, to better understand the impact of prepared cutting edges on the aspects of the machining processes, and to produce tailored cutting edges for specific load profiles, further investigation on the influence of the cutting edge design on the machining processes needs to be carried out. In this study, the effect of symmetrically and asymmetrically rounded cutting edge on the material in the vicinity of the cutting edge has been investigated using finite element simulation techniques. The results obtained from this investigation show that process forces and material flow under the flank face are mainly influenced by the micro-geometry S_??. However, the magnitude and the location of maximum nodal temperature are influenced by S_?? as well as S_??.     

铜-铝-铜复合板导电特性的模拟

利用有限元分析软件ANSYS,模拟计算了铜-铝-铜复合板参数对内部涡流电流的影响。模拟结果表明,在铜铝复合板整体厚度一定的前提下,存在适宜的厚度比;铜-铝-铜复合板的导电效率随复合板宽度的增加而提高;同时,铜铝复合板的外形对复合板的内部涡流也有很大的影响,圆边的双面复合板优于直边,且优于同尺寸四边覆铜的直边板。     

Modeling of minimum uncut chip thickness in micro machining of aluminum

Micro mechanical machining operations can fabricate miniaturized components from a wide range of engineering materials; however, there are several challenges during the operations that can cause dimensional inaccuracies and low productivity. In order to select optimal machining parameters, the material removal behavior during micro machining operations needs to be understood and implemented in models. The presence of the tool edge radius in micro machining, which is comparable in size to the uncut chip thickness, introduces a minimum uncut chip thickness (MUCT) under which the material is not removed but ploughed, resulting in increased machining forces that affect the surface integrity of the workpiece. This paper investigates the MUCT of rounded-edge tools. Analytical models based on identifying the stagnant point of the workpiece material during the machining have been proposed. Based on the models, the MUCT is found to be functions of the edge radius and friction coefficient, which is dependent on the tool geometry and properties of the workpiece material. The necessary parameters for the model are obtained experimentally from orthogonal cutting tests using a rounded-edge tool. The minimum uncut chip thickness (MUCT) is then verified with experimental tests using an aluminum workpiece.     

Wear Behaviour and Tool Life of Wire-EDM-ed and Ground Carbide Punches

This paper describes and discusses the wear behaviour and tool life of a cemented carbide punch produced in eight different qualities. Six samples covering a wide variety of EDM surface textures and surface integrities are compared to the performance of two ground punches. All punches have been tested on an industrial press. Burr height measurements on the stamped material, used as an evaluation of tool life, does not indicate significant influences of the production process. A more detailed analysis of the punch surface after 1×10⁶ punch cycles shows the presence of different wear zones. The surface layer influenced by the production process, either EDM or grinding, is completely removed in the zones near the cutting edge.     

热带边部减薄及凸度控制技术结合的探讨

热轧带钢生产技术对产品厚度、宽度、凸度和中直度已能较好地控制以后,带钢边部减薄（塌边缺陷）的问题越来越受到重视。通过分析各种轧机机组的特点,认为采用CVC轧机或PC轧机与K－WRS轧机结合的技术,既可以大幅度地控制热轧带钢的凸度和平直度,又能消除边部减薄,在获得高质量产品的条件下,可实现更大的自由规程轧制。