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电塑性拔丝技术及设备研制 总被引:1,自引:0,他引:1
介绍了金属电塑性拔丝技术的装置及电参数的工艺设定原则。在脉冲电流发生器的设计上,采用了大功率的全控型开关器件GTR模块,实现了较大的电流峰值,实测波形显示,其输出的脉冲矩形波较为规则,满足了电塑性加工过程所需电流峰值大、脉宽窄、脉宽和频率可调的技术要求,电拔丝实验结果表明,该设计是可行的。文中列举了三种电极与丝材的连接方法,并对其进行了比较分析。此外给出了电流工艺参数的选择方法,理论和实验结果分析表明,在电塑性加工中采用大电流,低频率,窄脉宽的脉冲电流形式是合理的。 相似文献
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以塑性加工的优点为依据,对采用塑性加工代替部分切削加工的优越性进行了阐述,并概略地介绍了几种易于采用、效果显著的塑性加工方法.以此证明,塑性加工是拓宽机械加工工艺发展方向的一个重要途径. 相似文献
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以塑性加工的优点为依据,对采用塑性加工代替部分切削加工的优越性进行了阐述,并概略地介绍了几种易于采用、效果显著的塑性加工方法。以此证明,塑性加工是拓宽机械加工工艺发展方向的一个重要途径。 相似文献
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滚(挤)压作为光整加工,在塑性金属零件上的应用已有许多成功经验和例子。但对淬火零件的滚(挤)压则几乎没有报导。本文介绍的电接触电阻加热挤压光整加工,可在淬硬的零件上应用,光洁度达(?)9。并通过挤压9Crsi(HRC50~60)淬火钢工艺试验,研究了电接触电阻加热挤压各工艺参数和光洁度之间的关系。 相似文献
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基于PLC的注塑机控制系统改造 总被引:5,自引:0,他引:5
张文利 《机电产品开发与创新》2010,23(1):156-158
探讨了XS-ZY-125型注塑机的机电系统控制问题,介绍了PLC在注塑机控制系统改造中的应用;给出了梯形图。 相似文献
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0INTRODUCTIONTransferpipingofcoalisanimportantpartintheproductionprocesofcoalfiredsteamelectricpowerplant.Thecoalisfeedint... 相似文献
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阐述基于图形化编程语言Lab VIEW的数据采集系统,该系统能够实时显示、记录、分析各种实验信号,是金属基金刚石砂轮的电火花整形技术的研究手段和研究基础.根据电火花加工原理,通过一系列实验,借助于数据采集系统采集整形过程中的电压和电流,总结了铸铁结合剂金刚石砂轮的电火花整形规律.采用最小进给量为10 nm的微进给工作台,实现了基于纳米进给的电火花整形,使铸铁结合剂砂轮达到了精密磨削的要求. 相似文献
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EFFECT OF UNEQUAL DEFORMATION IN DEVELOPMENT OF ADVANCED PLASTIC PROCESSING TECHNOLOGIES 总被引:1,自引:0,他引:1
Yang He Xian Feijun College of Materials Science Engineering Northwestern Polytechnical University Xi''''an China 《机械工程学报(英文版)》2002,15(1):79-82
0 INTRODUCTION(Plastic processing technology can make materials shape and improve their properties. Under the situation of rise of international market competition, knowledge economy, and green manufacturing, plastic processing technology is faced with a challenge from mark, information, environment, and resources. Therefore, plastic processing technologies are required to develop towards the 21st century in order to produce parts with light weight, high strength, high precision, high effi… 相似文献
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A computational study of die geometry and processing conditions effects on equal channel angular extrusion of a polymer 总被引:3,自引:0,他引:3
B. Aour F. Zaïri M. Naït-Abdelaziz J.M. Gloaguen O. Rahmani J.M. Lefebvre 《International Journal of Mechanical Sciences》2008,50(3):589-602
Equal channel angular extrusion (ECAE) is an efficient process to obtain enhanced microstructures via super-plastic deformation. In view of its optimisation, it is of prime importance to assess the relationships between processing conditions and material flow. More precisely, detailed knowledge of the plastic strain distribution in the extruded material in relation to the ECAE processing variables is required. The key parameters of the ECAE process are primarily die geometry, ram speed, extrusion temperature, use of back-pressure, number of extrusion sequences and processing route (e.g. rotation of the sample between successive passes). A numerical investigation was achieved to check out the influence of these parameters on the homogeneity of plastic strain distribution in the case of a conventional thermoplastic polymer. Material parameters of a phenomenological elastic viscoplastic model were deduced from compressive deformation tests at different temperatures and strain rates on high-density polyethylene (HDPE). Recommendations on tool geometry and processing conditions can then be provided, according to the numerical results.It was found that optimum ECAE die geometry is strongly material dependent. The application of a back-pressure significantly contributes to reduce the corner gap and consequently promotes the homogeneity of the plastic strain field. A slight sensitivity of plastic strain to ram speed and friction conditions was pointed out. The extrusion temperature strongly influences the magnitude of the plastic strain and has a slight effect on its homogeneity. The number of passes has a significant effect on the magnitude of the plastic strain but has a negligible influence beyond a certain temperature. The extruded material reaches a stationary strain state after few passes. The homogeneity of the plastic strain field is strongly affected by the processing route. 相似文献
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在微细电解线切割加工过程中,工具线电极与工件之间的加工间隙在微米量级,因此,电解加工产物的及时输运是微细电解线切割加工中极为关键的问题。提出在线电极进行轴向往复运动的同时叠加阳极低频微幅振动的方法,促进加工间隙内产物排出,提高加工精度与加工稳定性。探讨加工间隙内电解产物影响微细电解线切割加工精度的机理,研究线电极往复运动条件下阳极振动对加工间隙内产物排出效率的影响。试验结果表明提高阳极的振动频率和振动幅值可以改善微细电解线切割的加工精度和加工稳定性;阳极叠加振动较阳极无振动的切缝更宽、更均匀。采用优化参数加工出宽度4.28 μm的微缝、微槽以及方螺旋结构。 相似文献