两种多机构组合加工试验机的研制

介绍了两种新型的多机构组合加工试验机的结构和功能特点。其中多机构组合加工自动测量机能连续实现对工件的装夹、钻孔、镗孔和自动测量四个工序;另一种多机构组合加工螺栓扭紧机能连续实现对工件的装夹、钻孔、攻丝、自动扭紧螺母的工序。两种试验机在结构上采用了多种平面机构来实现各加工工序的快速进给、回退动作。试验机具有多功能、高效率、自动化程度高、动作可靠、成本较低的显著优点,适用于机械设计、机械制造以及机床自动化、自动检测等相关专业课程的实践教学环节。     

Influences of Ta, Nb, or Mo additions in Zr-based bulk metallic glasses on microstructure and thermal properties

The master-alloy ingots for casting bulk metallic glasses are routinely prepared by arc melting a mixture of pure elements. This paper addresses the difficulty in achieving complete and homogeneous melting of refractory component additions in Zr-based BMGs using the above procedure, and its influences on the microstructure and thermal behavior of alloys.     

Effects of temperature on the tribological behavior of Al0.25CoCrFeNi high-entropy alloy

The tribological behavior of Al_0.25CoCrFeNi high-entropy alloy (HEA) sliding against Si₃N₄ ball was investigated from room temperature to 600 ℃. The microstructure of the alloys was characterized by simple FCC phase with 260 HV. Below 300 ℃, with increasing temperature, the wear rate increased due to high temperature softening. The wear rate remained stabilized above 300 ℃ due to the anti-wear effect of the oxidation film on the contact interface. The dominant wear mechanism of HEA changed from abrasive wear at room temperature to delamination wear at 200 ℃, then delamination wear and oxidative wear at 300 ℃ and became oxidative above 300 ℃. Moreover, the adhesive wear existed concomitantly below 300 ℃.     

基于快速成型技术的警用小型电子产品工业设计方法研究

本文介绍了一种基于快速成型技术的警用小型电子产品的工业设计方法。与传统设计方法相比较,该方法在创新设计理念、缩短产品研制周期、保证产品质量等方面都有了重大突破。同时,本文以电子护照读写机具设计为例,详细阐述了应用这种方法进行警用小型电子产品设计的方法和流程,并将该方法与传统设计方法进行了详细的分析和比较。     

基于软件芯片的快速原型制造系统软件设计方法

本文把软件芯片的概念引入快速原型制造（RPM）系统的软件设计之中,根据RPM系统软件结构的特点,对其进行了软件芯片划分,并论述了每个软件芯片的功能。以数控语言解释器软件芯片为例,详细地介绍了RPM系统软件芯片的研制过程。研究了如何用软件芯片构造RPM系统软件。     

BPL: A set-based language for distributed system prototyping

Rapid prototyping of software and hardware is recognized as a very important step in timely, cost-effective system development. The complexity inherent in designing distributed computing systems and distributed problem solutions emphasizes the need for effective rapid prototyping tools. ADL/ADS is a testbed user interface tool for experimentation with critical research and design issues pertaining to distributed data processing (DDP). The experimenter expresses a candidate distributed system in terms of experiment objects, along with attributes and relationships. The experiment objects represent hardware, software, and behavior. This paper provides a brief overview of ADL/ADS, and gives especial emphasis to the Behavior Prototyping Language (BPL) within ADL/ADS. BPL is designed for expressing Behavior Modules (B_MODULEs)—the most versatile of the behavior objects. BPL incorporates set-theoretical approaches, and provides syntax designed for effectively describing manipulations of experiment objects, and their attributes and relationships.     

Predicting dam failure risk for sustainable flood retention basins: A generic case study for the wider Greater Manchester area

This study aims to provide a rapid screening tool for assessment of sustainable flood retention basins (SFRBs) to predict corresponding dam failure risks. A rapid expert-based assessment method for dam failure of SFRB supported by an artificial neural network (ANN) model has been presented. Flood storage was assessed for 110 SFRB and the corresponding Dam Failure Risk was evaluated for all dams across the wider Greater Manchester study area. The results show that Dam Failure Risk can be estimated by using the variables Dam Height, Dam Length, Maximum Flood Water Volume, Flood Water Surface Area, Mean Annual Rainfall (based on Met Office data), Altitude, Catchment Size, Urban Catchment Proportion, Forest Catchment Proportion and Managed Maximum Flood Water Volume. A cross-validation R² value of 0.70 for the ANN model signifies that the tool is likely to predict variables well for new data sets. Traditionally, dams are considered safe because they have been built according to high technical standards. However, many dams that were constructed decades ago do not meet the current state-of-the-art dam design guidelines. Spatial distribution maps show that dam failure risks of SFRB located near cities are higher than those situated in rural locations. The proposed tool could be used as an early warning system in times of heavy rainfall.     

Casting traceability with direct part marking using reconfigurable pin-type tooling based on paraffin–graphite actuators

Green sand moulding machines for cast iron foundries are presently unable to uniquely identify individual castings. An insert tool concept is developed and tested via incremental mock-up development. The tool is part of the pattern plate and changes shape between each moulding, thus giving each mould a unique ID by embossing a Data Matrix symbol into the sand. In the process of producing the mould, each casting can be given a unique (DPM), enabling part tracking throughout the casting's life cycle. Sand embossing is achieved with paraffin-actuated reconfigurable pin-type tooling under simulated processing conditions. The marker geometry limitations have been tested using static symbol patterns, both for sand embossing and actual casting marking. The marked castings have successfully been identified with decoding software. The study shows that the function of each element of this technology can be successfully applied within the foundry industry.     

开式箱体多孔衬套的组装及工装设计

利用工装安装制作开式箱体多孔衬套的加工方式,将铆焊技术与机械加工技术进行巧妙的结合,使制作流程更加紧凑、工序缩减、制作周期更短、加工难度降低。生产实践表明采用铆焊技术与机械加工相结合的制造方法既保证了工件的尺寸精度和质量要求,又提高了生产效率,节约了生产制造成本,效益显著。     

超细晶WC-Co硬质合金的发展及其应用

本文概括地综述了超细晶WC-Co硬质合金在制备工艺和检测技术等方面的发展情况,以汽车工业用刀具加工为实例,介绍了超细晶硬质合金的应用情况,并讨论了其发展前景。