新型陶瓷快速成型装置数控系统的研究

基于GT400运动控制器的开放式体系结构的数控系统软硬件平台及其关键技术,研究陶瓷零件快速成型设备数控系统对于缩短陶瓷零件的制造周期以及提高企业的生产效率所具有的重要意义.阐述了陶瓷零件快速成型机的新工艺方法和特点,对新型陶瓷零件快速成型机机械系统及其控制要求作了详细分析,着重介绍了陶瓷零件快速成型机控制系统的硬件设计及自顶向下的软件设计.利用Visual C++6.0开发工具和GT系列运动控制器自带的DLL动态链接库开发了操作方便、运行稳定、加工精度高的开放式陶瓷快速成型装置数控系统.控制系统能够很好地满足系统开放性的要求及产品自动化生产的要求,提高了经济效益.     

基于快速成型技术的陶瓷零件无模制造

概述了几种近几年发展起来的陶瓷零件快速成型技术,着重介绍了它们的原理及应用于陶瓷零件制造的研究现状,比较分析了各种快速成型技术的优缺点及在产业化应用中存在的问题,并对今后该技术的发展进行了展望.     

关于复点机缓冲臂组件轴套的加工工艺改进

我们通过对复点机缓冲臂组件轴套加工工艺的两次改进,由原来用圆料加工成型的轴套件,通过工艺分解,采用圆料和钣金加工组焊成型的方法,不仅大大降低了设备占用率,提高了生产效率,降低了生产成本,还使制约轴套零件加工速度的设备缺乏瓶颈问题得到彻底解决。     

连续纤维增强热塑性树脂基复合材料自动铺放原位成型技术的航空发展现状

基于自动铺丝手段,连续纤维增强热塑性树脂基复合材料可实现原位成型效果,即铺贴同时完成零件制造。该技术可降低复合材料成本达到50%以上,由于其高效低耗的技术特点,该技术被认为在航空领域具有广泛的应用前景。文章调研了热塑性复合材料原位成型技术在国内外航空领域相关的研究和应用工作。结合典型的技术开发案例,重点分析了目前原位成型技术在应用材料、装备及工艺控制技术等方面的水平现状,并阐述了原位成型技术的最新发展趋势。      

三维打印快速成型零件制作方向的优化研究

根据光敏树脂材料三维打印快速成型工艺的特点,建立了制件表面质量与零件制作方向之间的优化数学模型.选用搜寻全局最优解能力较强的遗传算法进行最优零件制作方向的求解,实现了三维打印快速成型工艺中零件制作方向的自动优化计算程序.通过试验和测试,该程序可快速求出零件的最优制作方向,提高零件的表面质量.     

胶态无模快速成形陶瓷制件的应用及发展趋势

胶态无模快速成形陶瓷制件由于具有成形精度高、可机械加工能力好、能够制备大尺寸,复杂形状陶瓷制件等特点而备受关注。本文综述了近年来发展迅速的几种陶瓷胶态无模快速成型技术。着重介绍了各种技术的成形原理和方法、工艺过程及研究现状等,通过比较分析了不同快速成型制造技术在陶瓷零件制造中的特点及其存在的问题,对于陶瓷零件成形时不同成形技术的选择提出了一些参考意见,并结合课题组研究成果展望了胶态成形的发展趋势。     

基于TRIZ理论的纸盒包装机成型机构设计与分析

目的为解决现有纸盒包装机存在的成型与粘盒工序分离、无法适应多规格纸盒生产、生产效率低等问题。方法文中引入发明问题解决理论(TRIZ理论),针对性地分析现有技术问题,提取出技术特征参数并组建矛盾对,通过查询矛盾冲突矩阵得到解决技术问题的发明原理,筛选出可用发明原理后再经过创新设计,对发明原理具体化,形成纸盒包装机成型机构的实际应用方案。结果得到了基于成型模块与喷胶组件有机耦合实现同一工位成型和粘盒,且可快速调整工装,以适用多种规格纸盒的成型机构创新设计方案。结论文中设计的纸盒包装机成型机构实现了成型与粘盒工序的集中,简化纸盒生产工序,又能满足多规格纸盒需求,提高设备柔性。     

卡箍精密成型模具设计

用传统弯曲模具加工卡箍类零件,由于零件在模具中弯曲成型时变形量大,零件成型后还需几道工序才能满足尺寸要求,工作量大,为此研制卡箍精密成型模具,通过预弯曲机构,使零件在成型过程中始终处于夹紧状态,减小零件成型中的变形量,经实际应用一次成型完成零件加工,质量可靠,极大提高了生产效率。     

陶瓷3D打印技术及材料研究进展

综述了陶瓷3D打印技术和材料的特性及其研究进展与应用现状,重点讨论了喷墨打印技术、熔化沉积成型技术、光固化成型技术、分层实体制造技术、激光选区熔化技术/激光选区烧结技术、三维打印成型技术、浆料直写成型技术的特性和研究进展,分析了磷酸三钙陶瓷、氧化铝陶瓷、陶瓷先驱体、SiC陶瓷、Si_3N_4陶瓷、碳硅化钛陶瓷的特性和应用现状,最后指出了陶瓷3D打印技术的发展方向是与传统陶瓷工艺相结合,实现陶瓷制品的快速生产及生物陶瓷制品、高性能陶瓷功能零件的制造。     

浅谈铝塑包装机吹气成型异常现象

本论文对我司BM350国产铝塑包装机进行分析，根据现有技术及包装机械特点，参考进口设备的优点，集合其设计理念，在铝塑包装机原有机构基础上，针对铝塑包装机在实际生产中出现的成型故障问题，结合设备使用经验，设备常见故障处理技巧，开展国产设备设计缺陷改造，通过对设备加热板正确调节、成型站吹气压力精准控制、成型站模具快速冷却，有效的控制该设备在生产使用过程中出现成型异常故障，从而实现降低铝塑包装机设备故障率，减少包材物料的用量，提升人均劳效的目标。     

Effect of machining parameters on turning of VAT32® superalloy with ceramic tool

The objective of this research was to study the machining of superalloy VAT32® using alumina-based ceramic tool without cutting fluid, applying different machining parameters to evaluate the surface finish of parts, vibration and main wear of tools. For this, a turning process with a linear trajectory of 30 mm was performed, in which were collected data vibration and surface roughness of the stretch, as well as wear and damage in the tools. The turning tests were performed utilizing cutting speeds of 270, 280 and 300 m/min, a feed of 0.10, 0.18 and 0.25 m/rev and a cutting depth of 0.50 mm. With results, it was identified that the feed influenced significantly both the vibration and the system, since the cutting speed influenced only the vibration. Being that the best results happened for the smaller feed and greater cutting speed. It concludes that the machining of superalloy VAT32® with ceramic tool introduced herself promising.     

3D打印陶瓷铸型研究与应用进展EI北大核心CSCD

陶瓷铸型是一类应用于熔模精密铸造领域、用于成型铸件内外部结构的复杂部件。随着铸件复杂度的提升,需要更加精细、复杂的铸型来满足铸造需求,然而传统的陶瓷铸型成型手段如注射成型等存在成本高、研发周期长等问题,难以满足复杂精细结构的成型要求。3D打印技术作为一种快速成型手段能够精准成型复杂精细结构,将其应用于铸型生产,不仅能够解决复杂结构的成型问题,同时也能降低生产成本、缩短生产周期。本文主要阐述了3D打印技术在陶瓷铸型生产中的应用,从应用于铸型3D打印陶瓷材料的种类及特性、典型铸型3D打印技术及铸型打印后处理手段三个方面对3D打印技术陶瓷铸型的研究与应用进行介绍,并对该技术未来的发展进行展望,指出3D打印技术能够有效解决复杂陶瓷铸型的成型问题,从而满足复杂空心结构金属件的铸造需求。     

Thermoplastic polymer nanocomposites for applications in optical devices

Polymer optical fibres (POF) have superior properties compared to glass fibres like e.g. high flexural strength, uncomplicated mechanical machining and inexpensive mass production. Dispersion of nanoscaled ceramic fillers in polymers allows the modification of the refractive index depending on the ceramic used and the aspired application. Current work deals with the development of a process chain to tailor the refractive index of PMMA using a UV-curable reactive resin and ceramic nanopowders as well as with the ageing behaviour of polymer nanocomposites. Improved dispersion techniques applying high shear forces to deagglomerate the ceramic powders lead to a refractive index shift depending on the ceramic fillers maintaining a transparency of resulting polymer nanocomposites sufficient for optical applications in the visible (633 nm) and in the infrared (1550 nm) regime. Optical devices were obtained using reaction moulding of the modified polymer nanocomposites as rapid prototyping method.     

EDM electrode manufacture using rapid tooling: a review

Electrical discharge machining (EDM) is a non-conventional process for the manufacture of complex or hard material parts that are difficult to machine by conventional machining processes. During EDM, the electrode shape is mirrored in the workpiece. As a result, problems are transferred on the electrode manufacturing process. Rapid tooling (RT) is a new technology which uses rapid prototyping (RP) models to reduce the time and cost of tool manufacture. The various methods of manufacturing RT electrodes, with respect to different materials and the incorporated supplementary processes, are classified in the present work. Recent international research work on RT electrodes is reviewed and the results on the performance of RT electrodes are tabulated.     

Hybrid approach in prototyping functional medical safety devices: A case study

Utilisation of functional prototypes during the upstream design stage is able to shorten the product development cycle of a medical device and quicken the transfer process to mass manufacturing. Innovative synergy of conventional manufacturing techniques and rapid prototyping techniques is thus needed to fabricate functional prototypes successfully. This case study reports on the development of an automatically activated safety needle using different prototyping approaches for the fabrication of functional prototypes. The approaches include rapid prototyping, computer numerical control (CNC) machining and vacuum casting. The challenges of each technique are discussed and solutions are presented. A hybrid technique involving CNC machining and vacuum casting is adopted to fabricate the prototypes. This hybrid prototyping approach was able to expand the choices for materials to fabricate the prototypes and thus enabling the validation of the design mechanism in a shorter time.     

Hybrid approach in prototyping functional medical safety devices: A case study

Utilisation of functional prototypes during the upstream design stage is able to shorten the product development cycle of a medical device and quicken the transfer process to mass manufacturing. Innovative synergy of conventional manufacturing techniques and rapid prototyping techniques is thus needed to fabricate functional prototypes successfully. This case study reports on the development of an automatically activated safety needle using different prototyping approaches for the fabrication of functional prototypes. The approaches include rapid prototyping, computer numerical control (CNC) machining and vacuum casting. The challenges of each technique are discussed and solutions are presented. A hybrid technique involving CNC machining and vacuum casting is adopted to fabricate the prototypes. This hybrid prototyping approach was able to expand the choices for materials to fabricate the prototypes and thus enabling the validation of the design mechanism in a shorter time.     

基于切削可靠性的新型陶瓷刀具材料的研制

建立了切削可靠性和刀具力学性能之间的关系模型,根据切削可靠性和断裂韧性的要求设计并制备出了颗粒和晶须协同增韧的陶瓷刀具JX-2,其力学性能与晶须增韧陶瓷刀具(JX-1)相当,但成本低,且抗扩散磨损的能力强.将JX-2、JX-1和硬质合金刀具YG6X进行对比切削电铸纯镍实验,JX-2的切削速度最高,磨损寿命最长,其抗磨损能力最强,是加工纯镍或高镍合金等材料的理想刀具.     

Rapid hard tooling by plasma spraying for injection molding and sheet metal forming

Amidst the harsh competition over the development of new products around the world, rapid prototyping, especially rapid tooling methods have received widespread attention. Amongst the rapid hard tooling methods, thermal spraying can manufacture metal molds without limitation of pattern size. However, it has the disadvantage that only soft metals with low melting points such as zinc alloy can be sprayed to original mold, such as a rapid prototyping model or a natural material pattern, due to their lack of heat resistance and shrinkage of spray metals. So the wear resistance of spray tool is poor, it can be used only for trial or small-lot production. In this study, attempts were made to improve the heat resistance by using composite materials made of ceramic and metal powders as the sprayed original mold materials, and using stainless steel, tungsten carbide alloy, iron–nickel–chromium alloy with excellent wear resistance as spraying materials, respectively. The results show that injection molding spray mold and sheet metal forming spray die can be made by transferring from natural patterns and rapid prototyping models. As the durability and dimensional accuracy of the sprayed tools has sharply improved, the tools can be used for mass production.