共查询到20条相似文献,搜索用时 15 毫秒
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《世界制造技术与装备市场》2006,(2):113
M CP真空铸造工艺是世界范围内,使用PU基真空塑料、石蜡及用硅树脂做工具的尼龙PA6等进行原型和有限系列零件制造中应用最为广泛的系统。M CP可提供30多种不同的真空塑料,其特性和性能可与热塑性材料媲美。M CP开发了一种用于真空树脂铸造的自动配料器,可使制造商和原型制造(R P)企业的大批量真空铸造作业的产量增加一倍。为响应用户缩短原型到投产的间隔时间要求而开发的自动配料器,可省去每次循环通常需要12~15分钟的手工配料时间。为方便工厂对新型机器的选用,该自动配料器还可用于改装包括4/04和4/05系列在内的M CP大型真空铸… 相似文献
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针对中小企业和科研单位的创新产品研究及小批量产品加工的应用要求,提出一种小型真空注型机的设计方案.在分析真空注型工艺的基础上,建立了真空注型机的功能模型;通过功能-结构的映射关系,构建其结构模型;利用形态综合法对子功能进行求解,从而获取真空注型机的功能结构树;最后,通过物理样机的制造,验证了结构设计的正确性和合理性. 相似文献
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为探究真空差压注型工艺(Differential Pressure Vacuum Casting,DPVC)中充模阶段充模速度及充模压差对薄壁产品质量的影响。采用一种基于SIMPLEC-VOF法的液-气两相耦合数学模型,对DPVC充模过程的流动形态进行了分析;并进行了相应的充模实验,数值模拟和实验结果表明:充模薄壁类产品(壁厚3mm内),注型材料黏性力占据了主导地位,扰动得到了有效抑制,流动是稳定的,差压充模过程卷气现象较少,但排气穴位置、数量对产品气穴缺陷影响较大,合理设置可基本消除注件内的气泡缺陷。 相似文献
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Dr Chua Chee Kai Chew Tong Howe Eu Kee Hoe 《The International Journal of Advanced Manufacturing Technology》1998,14(9):617-623
Connectors are developed to satisfy the needs of advanced technology in telecommunication switching systems and companies have several products designed to fulfil the needs of the many switching networks available. The Four-wall-header is one such product from one company. The traditional manufacturing line relies heavily on hard tooling which is both expensive and time-consuming. This paper presents an alternative method of integrating rapid prototyping technologies, in particular, stereolithography apparatus (SLA), with a vacuum casting system to produce a wide range of polyurethane parts. Altogether, three approaches are analysed and evaluated for making the moulds: rapid pattern, rapid tooling and a hybrid approach. 相似文献
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针对传统真空注型工艺参数的设定大多依靠人为经验而导致浇注件的质量难以控制的问题,考虑到真空注型工艺过程为典型的多变量非线性的间隙工业过程,结合实例推理、神经网络和模糊推理技术,构建真空注型智能质量控制系统。系统采用模块化结构,其中实例推理模块主要利用实例推理技术实现类似浇注实例工艺参数的自动检索;神经网络模块主要利用神经网络技术建立浇注件几何特征和工艺参数的关系模型,从而实现对新浇注实例工艺参数的智能推荐;模糊推理模块主要采用模糊推理技术实现工艺参数的智能修正。通过将该系统用于自制的真空注型物理样机验证了所研究的理论方法的可行性,以及所开发系统的高可靠性。 相似文献
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用于特种长光栅尺镀膜的ZZ-600W高真空蒸发镀膜机的主要技术指标、结构及性能,并给出了典型的镀膜工艺参数. 相似文献
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O. N. Alyakrinskiy D. Yu. Bolkhovityanov P. V. Logachev A. M. Medvedev Yu. I. Semenov A. A. Starostenko 《Russian Engineering Research》2016,36(5):360-363
Thermal conditions for the additive manufacture of components by melting metal and alloy wire are presented. In an experiment, a prototype 3D printer is used to print components in vacuum. 相似文献
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A new shell casting process based on expendable pattern with vacuum and low-pressure casting for aluminum and magnesium alloys 总被引:1,自引:1,他引:0
Wenming Jiang Zitian Fan Defeng Liao Xuanpu Dong Zhong Zhao 《The International Journal of Advanced Manufacturing Technology》2010,51(1-4):25-34
A new shell casting process, with the adoption of the foam pattern of lost foam casting (LFC) as prototype and the combination of the thin shell fabrication technology of investment casting and vacuum and low-pressure casting process, was proposed for manufacturing complicated and thin-walled aluminum and magnesium alloy precision castings. Loose-sand uniting vacuum was used in the new process to further reinforce the thin shell, and the new process proves to be a process with simple process, low cost, and high thin shell strength. Because the molten metal filling and solidification are completed under air pressure and vacuum level, the filling capability and feeding capacity of the molten metal are greatly improved, and the castings become denser. This paper mainly investigated the fabrication technology of thin shell based on foam pattern prototype, the removing foam and roasting shell process and vacuum and low-pressure casting process. The few-layer compound thin shell of silica sol–sodium silicate was adopted for the new process. Removing foam pattern was carried out at 250°C for 30 min, and the shell was roasted at 800°C for 1 h. Combined with the vacuum and low-pressure casting process, this new shell casting process has successfully produced thin wall and complex aluminum and magnesium alloy parts with high quality. In addition, comparisons in terms of filling ability, microstructure, mechanical properties, porosity, and surface roughness among this new shell casting, gravity casting, and LFC were also made to show the characterization of this new shell casting process. 相似文献
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在分析真空注型工艺的基础上,指出搅拌和浇注电机的速度控制是影响制品质量的关键因素.为解决现有设备使用的驱动电机转速无法实时精确控制的问题,提出一种将智能控制和预测控制相结合的基于模糊小波网络的智能预测控制器.该控制器以永磁同步电机为控制对象,以转子角速度为控制目标.通过设计模糊小波神经网络算法解决建模的精度问题,并阐述算法的实现过程.通过仿真实验证明了该控制器具有较好的鲁棒性、快速跟踪性及稳定性. 相似文献
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利用现代仿真技术,通过优化工件在各工序的加工时间,以消除工序中存在的工件等待加工现象。提出的方法还可用来预测机械制造系统的运行性能、比较各种可供选择的方案以及实现制造系统决策优化。 相似文献
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In this paper, we address the fine-tuning of existing schedules using techniques such as overlapping manufacture. Fine tuning may help the operator to minimise the disturbances within a cell if certain events occur. We try to show the complexity of overlapping manufacture and a way to bound the solution space such that an almost optimal solution can be found within a reasonable time. This work has been performed as part of the Esprit Project 2415 Distributed Manufacturing, Planning and Control. 相似文献