固液两相磨粒流研抛螺旋齿轮的数值模拟研究

为了探讨固液两相磨粒流研抛螺旋齿轮质量的影响,以螺旋齿轮为对象,进行数值模拟分析。通过分析可知:从轴向来看,在同一入口速度条件下,随流体不断流入,受曲面形状的影响,流道截面积不断变化,近壁面流体跟随曲面形状时刻做上下起伏、旋转运动,运动方向和流动状态不断变化,流体能量逐渐损失,抛光效果也随之减弱;从径向来看,流道越窄或流道曲面弯曲形状变化越均匀,流道截面积越均匀,磨粒流研抛工件表面质量均匀性越好。为促进固液磨粒流超精密加工技术的不断发展提供了技术支持。     

软金属球精密/超精密镜面抛光工艺

为了探究软金属球精密超精密加工的新途径,采用精密/超精密镜面抛光技术,对其进行镜面抛光实验.实验结果表明:研抛压力、抛光液的p H值、磨粒大小和研抛垫的厚度是影响表面加工质量的主要因素.当研抛压力在0.6~0.8 N/cm2、抛光液p H值为10、磨料粒度为W0.5、研抛垫厚度为2 mm时,抛光效果最佳,可以有效地提高加工效率,改善表面加工质量,得到表面粗糙度Ra为0.039μm的已加工表面.     

铜及铜合金环保型化学抛光工艺新探

为满足铜及铜合金使用对表面处理的要求,研究了铜及铜合金化学抛光液的组成和抛光工艺．结果表明,HNO3-H2O2-H2O-稳定液组成的化学抛光液最优配方为体积比1：1：7：1,聚乙二醇用量为20．0g／L;最佳抛光工艺条件为抛光温度25℃、抛光时间12S．该配方及工艺具有组成简单、污染小、成本低廉、抛光快和易于操作的优点,对铜及铜合金进行化学抛光效果良好．     

Manufacturing of a wear detecting sensor made of 17-4PH steel using standard wafer processing technology

A sensor to measure wear of the barrel wall in large ship's Diesel engines is presented. The sensor is a bolt made of steel, which is embedded in and abraded together with the barrel wall. The heart of the sensor is a steel chip supporting a conductive layer between two insulating layers. The conductive layer is structured in the form of resistive loops which are interrupted one after the other when the wall is abraded. Material loss is measured with a resolution of 10 μm over a total length of 3 mm. The sensor will be used to allow longer maintenance intervals for ships, this way reducing downtime and saving cost.     

Integrating grey sequencing with the genetic algorithm–immune algorithm to optimise touch panel cover glass polishing process parameter design

The touch panel cover glass is one of the important parts and components that determine touch panel quality. The quality requirement of touch panel cover glass emphasises the stability of glass thickness. As this factor directly influences the induction effect and touch of the touch panel, the parameter conditions for the cover glass polishing process have significant impact. This study integrated grey sequencing with the Genetic algorithm–Immune algorithm to optimise the parameter design for the touch panel cover glass polishing process. The experimental measurement value was the thickness value of the processed glass, and the uniformity of glass thickness after processing was discussed. The optimum processing combination influencing the process conditions is as follows: the ambient temperature is 22 (°C), the processing pressure is 0.04 (Mpa), the processing time is 30 (min), the machine speed is 70 (rpm), the polishing solution concentration is 1.4 (g/cm³), the central particle size of polishing powder is 1.4 (um) and the process capability C_pk is 1.75, which is better than the process capability of C_pk 1.41 of the response surface methodology and the process capability of C_pk 1.37 of the Taguchi experimental design.     

金属表面处理工艺对橡胶与金属粘合性能的影响

研究了金属表面处理中抛丸工艺，磷化工艺对橡胶与金属的粘合强度的影响。取得了相应的最佳工艺参数，用扫描电镜进行观察。证实了所提出的观点。     

生物质热化学转化合成二甲醚

在鼓泡流化床反应器内，采用空气-水蒸汽气化松木粉制备了富氢燃气，在下游的固定床重整反应器内，通过添加沼气重整富氢燃气，调变化学当量比，制备了含氮的生物质合成气. 在Cu-Zn-Al/HZSM-5催化剂上，对生物质合成气一步法合成二甲醚进行了实验研究. 在280℃, 4 MPa, 1000~4000 h-1的条件下，CO的单程转化率达到67%，单位质量催化剂的最大二甲醚时空收率0.358 g/(g×h) [DME/(催化剂×h)]；通过添加沼气重整，90%以上的生物质碳转化为合成气，二甲醚的最大产量为0.244 kg/kg (DME/生物质).     

紫铜化学抛光工艺的研究

研究了紫铜ＨＮＯ３－Ｈ２Ｏ２微酸性化学抛光工艺。在抛光溶液中添加亮剂，缓蚀剂和抑雾剂，改进了工艺成份。并通过正交试验获得了最佳工艺条件。该改进后的工艺可使紫铜表面达到机械镜面抛光的光亮度，同时大大地改善了操作环境。     

不锈钢模具板化学蚀刻、抛光和电镀铬研究

研究了不锈钢模具板的化学蚀刻、化学抛光和电镀铬工艺。分析了影响蚀刻、化学抛光和电镀铬质量的因素,得到了化学蚀刻、化学抛光及电镀铬最佳工艺参数和操作规范。该工艺可以用于各种类型不锈钢的化学蚀刻、化学抛光和电镀铬处理。     

Utilisation of time-variant influence functions in the computer controlled polishing

In the computer controlled polishing, a polishing tool moves in a well-defined manner across the workpiece surface in order to individually remove the surface error-profile. The commonly used technique to calculate the moving of the polishing tool is the dwell time method. Based on a constant (time-invariant) removal characteristic of the polishing tool (influence function) the amount of material to be removed is controlled via the dwell time. The longer the polishing tool is in contact with a particular area of the workpiece, the more material is removed at this position.Mathematical basics to calculate dwell time-profiles are shown, and a new approach considering time-variant influence functions for the computer controlled polishing is introduced. The results point out that time-variant influence functions may contribute to further decrease the process time, and thus to make a computer controlled polishing process more efficient. The reduction of the process time was observed to approximately 35% using a combination of the dwell time method with time-variant influence functions.