关键词： 超声振动   气体介质   电火花加工   表面质量  

摘要： 介绍了一种新兴的加工技术,超声振动—气体介质电火花复合加工技术。通过分析和实验探讨超声振动—气体介质电火花复合加工中影响表面质量的因素,并提出改进措施。

关键词： 激光加工产业   激光加工技术   西北工业大学   航空航天产业   中国光学学会   专业委员会   汽车产业   论坛  

摘要： 2011年8月18～19日，两年一届的全国激光加工产业论坛在西北工业大学召开。本届论坛由中国光学学会激光加工专业委员会、陕西省发改委和西北工业大学联合主办。论坛以“共享航空航天产业平台，深化激光加工产业发展”为主线，充分利用西北航天、航空、兵器、汽车产业发展平台，进一步深化了学术界和产业界的沟通与合作。

关键词： SUPER   激光加工机   二维   切割厚度   激光振荡器   株式会社   输出功率   厚钢板  

摘要： 日本山崎马扎克机械株式会社开发出了能够稳定切割厚钢板的二维激光加工机“SUPER TURBO－X 510 Mk Ⅲ”。其激光振荡器的输出功率由原来的4kW提高到了6kW，能够稳定切割厚度在32mm以下的软钢和厚度在20mm以下的不锈钢。

关键词： 电火花加工   场致发射   平板电容模型   仿真  

摘要： 基于场致发射理论提出描述电火花加工(Electrical discharging machining,EDM)过程的平板电容模型,将单脉冲放电周期依次划分为极间电场建立、极间通道击穿、正常放电加工与消电离四个阶段,并分别进行各阶段的极间电场强度、极间电子自由程、极间介质介电常数和极间电流变化规律的理论分析。讨论EDM加工能量大小的影响因素,并给出基于该模型的极间电压与放电电流变化的仿真步骤与方法集。设计通孔加工试验和实时电流与电压采集电路,并基于该模型对极间电压与电流的变化曲线进行Simulink仿真程序设计。试验结果表明,相同加工参数实测曲线与仿真试验图形实现了较好的吻合,而且试验结果统计分析表明,该模型对不同电极材料与加工参数对加工效率的影响可做出合理解释且对加工效率有着良好的预测能力,证明了该模型的合理性与有效性。

关键词： Full factorial design   Hardened steel   Micro EDM   MRR and ANOVA  

摘要： In recent year's hardened steel is widely used for making micro dies, micro punches and micro gears due to its high hardness, wear resistance and high strength. μEDM is one of the most effective and efficient methods for machining hard materials. This study focuses on the influence of process parameter such as voltage, capacitance and spark gap on EDM process when drilling micro holes in hardened steel. A full factorial design was used for conducting the experiments. The effect of these process parameters on the Material Removal Rate (MRR) was analyzed. The experimental result shows that the MRR increases with increase in voltage and capacitance and decreases with increase in spark gap. Analysis of Variance (ANOVA) was carried out to find the significant parameter. From the ANOVA, it is identified that the voltage is the most significant parameter and the capacitance is the next significant parameter that affects the MRR. © EuroJournals Publishing, Inc. 2011.

关键词： Aluminium metal matrix composites   Analysis of variance   Electric discharge machining   Multiple linear regression model   Signal-to-noise ratio   Taguchi technique  

摘要： The influence of process parameters on surface roughness (SR), material removal rate (MRR) and tool wear rate (TWR) in electric discharge machining (EDM) of aluminium-fly ash-graphite hybrid metal matrix composites was investigated. The design of experiments approach using Taguchi method was employed to optimise the parameters like peak current, flushing pressure and pulse on time (T_on) in EDM of hybrid composites for minimum SR and TWR, and maximum MRR. An Electronica-Small die sinking electric discharge machine was used to drill holes in the hybrid composite workpiece. Experiments were conducted based on the Taguchi parameter design by varying the peak current, flushing pressure of dielectric fluid and T_on). Signal-to-noise ratio and analysis of variance were used to investigate the influence of parameters on the SR, MRR and TWR. It was determined that peak current was the most significant parameter influencing the responses, followed by T_on) and flushing pressure. There was an increase in the SR of hybrid composites with increases in peak current and T_on) due to the generation of much larger and deeper craters on the drilled surface. SR also increases with an increase in flushing pressure. It was determined that the MRR increases almost linearly with increases of peak current, flushing pressure and T_on). There was an increase in TWR with increases in peak current and flushing pressure. However, when T_on) was increased, there was a marginal decrease in the TWR due to formation of carbon deposits on the electrode. Multiple linear regression models were developed to predict the SR, MRR and TWR. © EuroJournals Publishing, Inc. 2011.

摘要： Mechanical surface enhancement techniques have been used to successfully increase the fatigue life of metallic components. These techniques impart compressive surface residual stresses that reduce the tensile stresses experienced during service loading. Laser Peening (LP) is a surface enhancement technique that uses high intensity, short duration laser pulses to create plastic shockwaves in metallic components. Experimental investiga- tions and limited simulation studies have been conducted to determine the effects on the fatigue life of simple coupons when key LP parameters are varied. Used primarily in the aerospace and biomedical engineering fields, LP has been limited to industries that can afford its currently high development and processing costs. Reducing these costs requires that LP simulations, which currently require tremendous amounts of computational power and time due to their complexity, become more time effective and user accessible. This work seeks to address these needs by reducing the overall simulation time of large sur- face LP processing. The first objective of this work is to reduce the simulation time of an individual LP shot by furthering the development of an extended duration explicit Finite El- ement Analysis method. Error between the new method and the accepted analysis method is calculated to demonstrate the viability of the new approach. The second objective is to reduce the simulation time of large LP patterns. A symmetry cell approach is developed and used to create a base unit of an LP shot pattern, which is used to reproduce the pattern over a large surface. The last objective is to investigate the effects that the sequencing of LP shots within a pattern can have upon the fatigue life of the component. Due to interac- tions between adjacent LP shots, the most recent shot in an LP pattern will have the largest compressive stresses. By sequencing the shots in a particular order, the fatigue life of a component can be increased over th

关键词： 峰值电流   脉冲宽度   脉冲间隔   加工效率   强制排屑  

摘要： 电火花加工属于电腐蚀加工，现在广泛用于淬火钢，硬质合金，金属陶瓷材料等难加工材料的加工，同时也用于刀具切削无法直接成形的复杂零件的成形加工。所以电火花加工现在已经成为模具加工中最重要的手段。在电火花加工中，峰值电流，脉冲宽度，脉冲间隔等电参数和是影响加工速度的重要因素。但一味的提高加工参数不仅不会使加工效率提高。反而使加工速度下降。在加工过程中。加工的环境影响着加工过程的稳定性．加工的稳定性制约着加工的参数的选择。本文是介绍通过改善其放电环境使短路率，积碳率和异常放电率下降，使加工的稳定性上升。从而改变峰值电流，脉冲宽度．脉冲间隔，抬刀速度等电参数来提高加工效率。

关键词： 工业机器人   激光加工   三维成型堆积   虚拟仿真   OpenGL   Matlab  

摘要： 在机器人运动学分析基础上,结合激光加工的特点并利用MATLAB的GUI(图形用户界面)功能设计出多自由度三维激光加工工业机器人虚拟仿真软件,实现3到6关节多自由度机器人的运动仿真,并通过云图给出机器人的工作空间,通过仿真完成基于工业机器人的激光成型堆积工作过程的规划,从而更好的指导现场加工,并在此基础上利用VC++实现了基于OpenGL(开放三维图形开发库)的激光三维成型堆积加工过程的仿真。

关键词： 微深孔   激光加工   高副接触  

摘要： 在高副接触零件表面制造大量的微深孔,微深孔可以吸附与存储润滑油。主要阐述了激光加工过程中影响微深孔加工的因素。应用HGL-LCY300激光加工设备在滚轮表面打出了直径为Φ0.1 mm～Φ0.2 mm、孔深为1 mm左右的众多排列有序的微深孔。通过滚轮磨损实验初步表明:高副接触零件表面的微深孔能提升材料的耐磨性。