CMM与CAD/CAPP/CAM系统的集成方法

坐标测量机（ Ｃ Ｍ Ｍ） 与 Ｃ Ａ Ｄ／ Ｃ Ａ Ｐ Ｐ／ Ｃ Ａ Ｍ 系统的集成化对于提高仿形加工的精度和效率十分必要。本文重点介绍了 Ｃ Ｍ Ｍ 与 Ｃ Ａ Ｄ／ Ｃ Ａ Ｐ Ｐ／ Ｃ Ａ Ｍ 系统的接口方式。     

通用化箱体类零件CAPP／NCP集成系统的研究

介绍了一个已研制成功的通用化箱体类零件ＣＡＰＰ／ＮＣＰ集民系统ＳＵＣＡＰ，该系统能够对加工特征进行了定义，修改等管理工作。用户在特征库的支持下，对箱体类零件者描述，系统则根据描述的信息自动生成面向加工中心的工艺卡片和数控加工源代码。该系统已经得到了成功的应用。     

基于STEP的机械零件CAD/CAPP的集成方法

在统一的产品信息模型的基础上,采用 Ｓ Ｔ Ｅ Ｐ标准实现产品数据的交换与共享,制定了圆锥 轮的应用协议（ Ｚ Ｃ Ａ Ｐ）,达到 Ｃ Ａ Ｄ／ Ｃ Ａ Ｐ Ｐ系统集成。 Ｃ Ａ Ｄ 系统根据 Ｚ Ｃ Ａ Ｐ建立零件特征模型,输出 Ｓ Ｔ Ｅ Ｐ中性文件。 Ｃ Ａ Ｐ Ｐ系统根据应用协议对 Ｓ Ｔ Ｅ Ｐ中性文件进行后置处理,提取零件信息,制定加工工艺。为了使产品数据操作方便,该系统可以对产品数据进行查阅、修改及 Ｓ Ｔ Ｅ Ｐ文件的重构。     

滚子齿形空间凸轮的计算机辅助制造

本文根据滚子齿形空间凸轮的θ－τ两轴加工原理，建立了滚子齿形空间凸轮的ＣＡＭ系统；给出了采用Ｈ６Ｃ加工中心加工滚子齿形空间凸轮的原理、加工程序的编制即刀具中心轨迹坐标的计算方法及流程框图，开发了系统应用软件；成功地加工出高精度的滚子齿形空间凸轮。     

一种基于任务的协同管理Agent的模型与算法

针对多Ａｇｅｎｔ处理环境（ＭＡＰＥ），为提高协同工作的效率，在文献［１，２］基础上给出了一个包含协同管理Ａｇｅｎｔ的ＣＳＣＷ系统框架，同时给出了一个协同管理Ａｇｅｎｔ的模型。由于协同管理Ａｇｅｎｔ的模型仍是框架性质的，无法在计算机上实现，为此在文献［６，１９］所提供的数学模型基础上，提出了一种基于任务的协同管理Ａｇｅｎｔ群体决策与协同谈判的数学模型与算法。     

FA/FA-P系列数控电火花线切割机床新技术

为缩短交货周期、提高加工精度和降低生产成本 ,除了要提高机床本身的加工性能外 ,还要研究如何提高生产效率 (包括在连续自动化操作中减少维护时间和长时间工作的稳定性 )。为了满足市场需求 ,高精度 64位数控ＦＡ系列和ＦＡ -Ｐ系列数控电火花线切割加工机床集成了新的技术 ,体现了快速、简洁、可靠三大特性。ＦＡ系列和ＦＡ -Ｐ系列线切割加工机床 ,是适用于大范围加工的 (从模具加工到零件加工 )高性能线切割加工机床。图 1是ＦＡ2 0机床外观。本文重点介绍ＦＡ ＦＡ -Ｐ系列机床新的技术特性。1　ＦＡ ＦＡ -Ｐ系列机床新的技术特性　…     

基于分布式数据库系统的CAPP及实施

阐述了分布式 Ｃ Ａ Ｐ Ｐ的产生及分布式数据库系统的基本概念,通过对基于分布式数据库系统的 Ｃ Ａ Ｐ Ｐ 应用项目的具体实施,描述了分布式数据库系统在 Ｃ Ａ Ｐ Ｐ 中的作用,探讨了 Ｃ Ａ Ｐ Ｐ 系统与其它应用系统在 Ｃ Ｉ Ｍ 环境下的信息集成。     

杭州汽轮机厂计算机集成制造系统项目获浙江省科技进步一等奖

由杭州汽轮动刀集团公司与浙江文学生产工程研究所共同完成的“杭州汽轮机厂计算机集成制造系统（ＨＴＷ－ＣＩＭＳ）”项目，荣获１９９９年度浙江省科学技术进步奖一等奖。 该项目包括：计算机辅助事务处理子系统（ＨＴＷ－ＣＡＯ）、设计子系统（ＨＴＷ－ＣＡＤ）、生产准备子系统（ＨＴＷ－ＣＡＰ）、生产计划与控制子系统（ＨＴＷ－ＰＰＣ）、制造子系统（ＨＴＷ－ＣＡＭ）、质量管理子系统（ＨＴＷ－ＣＡＱ）等６个子系统。该系统实现了生产计划和车间作业计划的集成，以工业汽轮机关键零件为对象，实现ＣＡＤ／ＣＡＰＰ／ＮＣ一体化…     

一种基于特征的零件信息描述

目前大多数商用ＣＡＤ系统缺乏零件的制造信息，而且许多实验系统所进行的零件特征描述亦存在大局限性。提出一个以Ｉ－ＤＥＡＳ软件为基础的特征模型，对零件的几何信息和加工工艺信息都提供较完备的描述，以特定格式输出，并形成ＳＴＥＰ格式的中性方件，以便于ＣＡＤ／ＣＡＭ的集成。     

DYNAPATH系统在数控火焰切割机中的应用

ＤＹＮＡＰＡＴＨ系统在数控火焰切割机中的应用哈尔滨四海数控设备有限公司做为生产数控火焰切割机的专业厂家，我们经过论证、调研后采用了美国ＡＵＴＯＣＯＮ公司的ＤＹＮＡＰＡＴＨＤＥＬＴＡ１０系统作为火焰切割机的主控制系统。在实践中，我们感到ＤＹＮＡＰＡＴＨ...     

Tribological behaviour of new chemically bonded PTFE polyamide compounds

Topic of the study is the formation of new PTFE polyamide materials by reactive extrusion. The new type of formed PTFE polyamide compound shows very good material properties. Recently it has been revealed that carboxylic acid groups exhibit a very high reactivity under polyamide melting conditions. PTFE micro powders functionalized by carboxylic acid groups are the base for the block copolymer formation in polyamide melts under defined process conditions. Such functionalized micro powders are formed from virgin PTFE by electron irradiation in the presence of oxygen. These new PTFE polyamide materials can be processed easily using commercial (common) process equipment like twin-screw extruders and injection molding. Many experimental investigations have been performed under dry sliding friction on PA 6, PA 6.6 and PA 12 compounds with PTFE weight portions between 3.3 and 50%. They show low coefficients of friction and low specific wear rates. The wear resistance of newly developed PTFE polyamide compounds is comparable with commercially available mechanically or physically produced PTFE and PEAK compounds.     

Effects of ABS-g-MAH on the properties of Nylon 6/ABS alloy

The alloy of Nylon 6/acrylonitrile-butadiene-styrene (ABS) was used for a compatibilizer to generate the maleic anhydride (ABS-g-MAH),in which the proportion of PA6/ABS is 90/10.The results of the mech...     

一种高性能低VOC尼龙6复合材料的研究

通过研究基料、无机填料、增韧剂、润滑剂对尼龙6(PA6)复合材料的物理性能、VOC的影响,得到一种高性能低VOC的PA6复合材料。结果表明:以PA6 IM为基料、滑石粉为无机填料、EPDM 3092M为增韧剂、E525为润滑剂的尼龙6复合材料,具有高性能、低VOC的优点。     

Choosing Phased Array Pitch in Ultrasonic Tomography of Materials with Inhomogeneous Structure

The influence of phased array (PA) pitch on signal/pattern-noise ratio when probing objects with inhomogeneous structure by low-aperture transducers of transverse acoustic waves is considered. A saturation phenomenon has been discovered for small PA pitches. The phenomenon is due to the influence of positive cross correlation between pattern-noise instances at neighboring receiving transducers. The optimum PA pitch has been determined to be approximately 0.5 of the wavelength when probing the object area across the PA and 0.4 of the wavelength when probing areas at the side of the PA. Experimental research has been carried out and proved the validity of the theoretical results.     

A study of positive charge effect on AFM anodization lithography using metal phosphate monolayers

Monolayer films of metal phosphate were prepared by sequential adsorption of phosphoric acid (PA) and metal ions (Zr4+ or Ca2+). The monolayer formation was confirmed and characterized by ellipsometry and atomic force microscopy (AFM). Nanometer-scale patterning on the self-assembled metal phosphate films has been achieved using AFM. The difference in AFM lithography on positively charged surfaces in the case of Zr4+ and Ca2+ ions was investigated and summarized. Since the presence of the positive charges allows electrons to move from a tip to a layer easily, the lithographic process initiates at a lower voltage in the layer of Zr2+ phosphate than in the layer of Ca phosphate or PA. Other lithographic results on metal phosphate layers were compared with those on a monolayer of PA.     

Effect of solid lubricant and fibrous reinforcement on the abrasive wear of polyamides

Short glass fibre‐reinforced polyamide 6 and polyamide 11 (PA 6 and PA 11) with and without a solid lubricant of polytetrafluoroethylene and metal powders (e.g., bronze) and copper as fillers were formulated and characterised for their compositional and mechanical properties. A tribological evaluation of these composites' abrasive wear was carried out by abrading a polymer pin against 80 grade (175 um) silicon carbide (SiC) paper under single‐pass conditions at various loads. It was observed that the fibre reinforcement reduced the abrasive wear resistance of virgin polymers. A combination of fibre and particulate fillers was further detrimental in this respect. Efforts were made to correlate the wear performance with the ductility factor, fracture toughness, and fracture energy in the case of PA 6 and its composites.     

Tribological behaviour of polymeric coatings lubricated with salt water

In many applications, such as marine industries, pumping of underground water, and in some chemical industries, sliding elements are lubricated with the process fluid (e.g. salt water). Therefore, the effect of salt water on the tribological behaviour of metallic friction couples has been a subject of study. In the present work, the influence of salt water solution (3 wt. % sodium chloride) on the tribological behaviour of some polymeric coatings is investigated, using a pin-on-disc testing machine, at different sliding speeds and normal loads. The coating consists of a base-matrix of high-density polyethylene (HDPE) and polyamide (PA6) with different concentrations of copper- and tin-powder fillers. The effect of the formation of the oxide films, sodium hydroxide microlayers (NaOH) and the polymeric transformed films on the friction mechanism, is discussed. The results show that squeeze of the lubricant takes place in the presence of the NaCl-solution; and, despite the relatively low viscosity of the lubricant, hydrodynamic pressure affected the friction mechanism at the sliding speed of 0.50 m/s, resulting in a significant reduction in the coefficient of friction. The value of the coefficient of friction seems also to be affected by the generation of sodium hydroxide, as well as the oxide films and material transfer layers. At a low speed (0.20 m/s), the PA6-based composites with copper-filler showed an optimal wear resistance at normal loads up to 15N.     

内燃机活塞环组密封性能研究

为检验活塞环的密封性,进一步研究其摩擦学性能,建立内燃机环组密封数值仿真模型,模型中考虑气室体积、泄漏面积、内燃机运转工况和气室温度变化项等因素对活塞环密封性能的影响.以PA6-280柴油机为例,对活塞环组的密封性能进行仿真计算.结果表明,磨损对环组的密封性能影响很大,而工况对活塞环的密封性影响不是很明显;气室温度变化项对活塞环漏量影响较大,设计时不容忽视.     

尼龙粉末激光烧结的数值模拟与实验分析

激光选区烧结热传导对成型物有着直接影响。基于点热源热传导理论,建立了尼龙粉末材料的激光高斯热源热传导方程,通过理论和实验分析,得到了尼龙粉末（PA6）材料的有效热传导系数和密度比热系数,为后续工艺优化提供了理论基础。     

The influence of organobentonite clay on CO2 laser grooving of nylon 6 composites

The popular polycaprolactam (polyamide PA6), commonly referred to as nylon 6, widely used as a construction plastic, is not a typical material for micromachining by CO₂ laser vaporization. In this paper, we describe investigations of the pulsed CO₂ laser grooving of both the chemically pure and the organobentonite clay modified nylon 6. Our results indicate that doping of nylon 6 with nanoparticles of organophilized bentonite significantly improves the grooving ability, predictability of the process, and its quality. In order to determine the nature of the changes in the depth and width of the grooves as a function of the laser process parameters, theoretical modeling of the laser grooving of nylon was carried out. The basic parameters of the laser grooving process versus laser beam intensity, pulse repetition rate, scanning speed of the material and various compositions of the organophilized bentonite dopant are presented. Additionally, an example of a three-dimensional engraving/milling of tested materials as well as the impact of doping on the channel profile are examined. The modification of nylon 6 by appropriate doping with bentonite clay radically improves the quality of micromachining with a CO₂ laser.