基于r2法刀具偏移计算实现

本文详细介绍了r2法实现刀具偏移计算的基本原理和实施方法.     

冲压工艺技术在电机端盖制造中的应用

分析了压缩机用电机端盖的结构工艺,介绍了电机端盖冲裁和拉深工艺的具体设计;充分利用拉深、反拉深交替进行的方法,抵消拉深产生的残余应力;提高拉深成形的可靠性,确保产品质量.     

基于功率变化率的刀具破损监测系统

介绍一种以刀具切削功率变化率为信号，利用单片机进行处理与判断，实现加工过程刀具破损在线监测的系统组成和工作原理，讨论了提高刀具破损报警准确性的措施。     

The Effect of Coolant Concentration on the Machinability of Nickel-Base, Nimonic C-263, Alloy

This paper investigates the effect of coolant concentration on tool performance when machining nickel-base, C-263, alloy with triple coated (TiN/TiCN/TiN) carbide insert at various (3–9%) coolant concentrations and under different cutting speed conditions. Tool life, tool-failure modes, wear rates, component forces and surface finish generated during machining were recorded, analyzed and used to formulate mechanisms responsible for tool wear at the cutting conditions investigated. Analysis of the recorded data shows that tool performance during machining is dependent on coolant concentration. 6% coolant concentration gave the best overall performance as effective combination of cooling and lubrication functions were achieved during machining. Increasing coolant concentration to 9% reduced tool performance due to a reduction of the tool-chip contact length area and the consequent increase in compressive stresses at the tool-chip and tool-workpiece interfaces. This action often leads to pronounced chipping of the tool cutting edge during machining. Friction coefficient between the workpiece material and substrate increases once the coating layer(s) is broken as a result of the direct contact between the tool substrate and the work material. This action increases mechanical wear of the tool, which in turn leads to a significant increase in the cutting force with negligible effect on the feed forces during machining.     

精磨硬质合金数控刀片切削与磨损性能的实验研究

对YT14三角形硬质合金数控刀片的切削与磨损性能进行了实验研究.在实验中,针对两种不同精度级的数控刀片进行了切削性能和磨损特性对比实验.实验表明：刀片精度级越高,其磨损速度越低.用高精度级刀片进行切削加工,不仅可以提高工件的加工表面质量,还可延长刀片的使用寿命,从而节省刀片的购置费用,具有可观的经济效益和社会效益.     

Optimization of abrasive water jet cutting of ductile materials

Full factorial design of experiments was developed in order to investigate the effects of jet pressure, abrasive mixing rate, cutting feed, and plate thickness upon three response variables, surface finish of cutting wear zone, percentage proportion of striation free area, and maximum width of cut. The set of sixteen experiments was performed on each of the following two ductile materials: AISI 4340 (high strength low alloy steel, hardened to 49HRc) and Aluminum 2219. Analysis of Variance (ANOVA) was performed on experimental data in order to determine the significance of effects of different parameters on the performance measures. It was found that cutting feed and thickness were highly influential parameters, while abrasive mixing rate is influential upon surface roughness only. Strong interaction was found between jet pressure and workpiece material. Multi-criteria numerical optimization was performed in order to simultaneously maximize/minimize different combinations of performance measures.     

高能同步辐射光源逐束团束流位置测量电子学研制

基于高能同步辐射光源（HEPS）储存环,研制了一套逐束团束流位置测量（BPM）电子学系统,电子学的硬件部分由模拟信号采集板卡和数字信号处理板卡组成,软件部分由底层固件和顶层应用软件组成。系统的采样频率为500 MHz,带宽为1 GHz,对来自储存环BPM探头的4路模拟信号进行数字化,得到束团幅度数据,利用ZYNQ芯片计算出每个束团在真空管道中的位置。逐束团BPM电子学在实验室的测试结果为：输入信号峰峰值小于1.8 V时ADC通道非线性度小于1%,无杂散动态范围约60 dB,灵敏度系数取8.26 mm时位置分辨率优于10 μm,测试结果满足HEPS逐束团BPM的需求。     

圆盘造球机旋转刮刀参数的仿真优化

对圆盘造球机旋转刮刀运行轨迹不理想,盘面不平整的问题进行了分析,找出了其主要原因是圆盘转速与刮刀转速不匹配。为此对刮刀参数进行了仿真优化并将优化结果用于刮刀转速控制。使用结果表明,仿真优化后生球质量得到了明显改善。     

基于差频检测技术的高速AD单粒子翻转评估方法研究

本文基于差频检测的原理,提出一种在高频动态输入模式下,对高速高精度模数转换器（AD）的抗单粒子翻转效应进行评估的测试方法,并以一款8位3 GSPS高速AD为测试对象,设计开发了一套高速AD单粒子翻转效应测试系统,对目标器件进行了重离子试验。通过对试验结果的图像和错误数据进行分析,评估参试器件的抗辐照性能参数,为抗辐照高速高精度AD的加固设计提供数据支撑。     

工业CT双通道高速数据传输系统设计

基于千兆以太网和PCI - EXPRESS两种总线协议设计出了一套工业CT双通道数据传输系统.系统接收数据采集模块发送的数字电信号,分别通过千兆以太网和PCI - EXPRESS发送至外部网络或工控机中,两种协议之间也可以相互通讯,提高系统利用率.针对现有同类系统集成度不高的现状,设计方案采用SOPC技术中的IP硬核和...