共查询到17条相似文献,搜索用时 140 毫秒
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针对电火花线切割工艺特征,分析了线切割加工中电极丝偏移量产生的原因,提出数控编程中电极丝中心线实际加工轨迹的计算方法及工件线切割加工的工艺性分析与特殊工艺的处理方法,以提高线切割加工件的加工精度和制造质量。 相似文献
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电火花线切割加工作为一种特种精密加工技术,近年来得到了迅速的发展。特别是慢走丝线切割加工,已经成为模具制造和金属加工行业必不可少的加工手段。线切割技术的发展,离不开电极丝技术的同步发展。因为线切割机的切割效率和切割质量与电极丝的性能紧密相关,而电极丝技术的突破往往会导致线切割机设计 相似文献
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通过对数控电火花线切割加工中的电极丝直径大小的分析,探讨了电极丝直径大小对线切割加工的工艺影响,以及更换电极丝大小的方法. 相似文献
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研发了双丝筒长丝往复走丝电火花线切割加工技术及工艺方法,提高了"中走丝"线切割加工的精度、降低了表面粗糙度。通过构建双丝筒恒张力可往复、变速运丝系统,使往复走丝和单向走丝线切割加工的工艺方法很好地结合在一起。基于该研发成果,采取先往复走丝切割、后单向走丝修整切割,实现修切时与单向走丝线切割相同的加工工艺,为"中走丝"线切割加工质量更接近单向走丝的加工水准创造了条件。同时,该方法实现了电极丝的循环使用,与单向走丝线切割加工方法相比,节约了电极丝资源。 相似文献
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陶希海 《组合机床与自动化加工技术》2009,(4)
粉末冶金模具的加工制造方法直接影响着粉末冶金制品的质量、开发周期及制造成本.线切割加工具有不需要特定形状的电极,加工几乎所有硬度、任何形状的工件,轮廓加工所需的加工余量小,利于少无切削,电极丝往复使用,损耗较小,加工精度高等特点,这种加工工艺非常适合于小批量多品种粉末冶金模具的加工.本文根据数控线切割加工粉末冶金模具的加工工艺方法,利用Pro/Engineer系统的Pro/NC模块,研究了粉末冶金模具型腔的数控线切割加工仿真,并自动生成了数控加工程序,从而将产品的计算机辅助设计(CAD)与计算机辅助制造(CAM)实现了无缝结合,大大提高了粉末冶金制品的制造精度,实现了加工自动化,缩短了开发周期,降低了制造成本. 相似文献
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从材料的残余应力、加工工艺、机床自身因素入手,分析了快走丝线切割在模具型腔和型芯的加工过程中影响加工精度和表面质量的主要因素,提出了提高线切割加工精度和表面质量的改进措施,在实际加工过程中效果显著. 相似文献
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Fuzhu Han Gang Cheng Zhijing Feng Soichiro Isago 《International Journal of Machine Tools and Manufacture》2008,48(7-8):922-931
The tension control of the micro wire electrode is a key technology for the micro wire electro-discharge machining (WEDM). Based on the coupled thermo-mechanical analysis, both the three-dimensional temperature and the stress distribution in the micro wire are determined. As a result, the tension of the micro wire electrode during the WEDM process can be optimized in accordance with the discharge energy, which is sampled and fed back to the tension control system in real time. Then the development of an optimal tension control system characterized by the form of master–slaver structure makes it possible to keep the wire tension optimal in the process of WEDM. The results of the machining experiments show that the optimal wire tension control is effective on the improvement of the machining accuracy with the prevention of wire breakage for the micro WEDM. 相似文献
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二次切割法在模具加工中的应用 总被引:1,自引:0,他引:1
电火花线切割加工中,影响模具加工精度与表面粗糙度的原因是多方面的。应用二次切割法,既有利于提高切割效率,又能保证加工质量,也可去除模具零件表面交接点突尖。 相似文献
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基于试验研究,创新性地提出了采用单向走丝电火花线切割机床对超大孔径聚晶金刚石拉丝模具的孔形进行粗加工。以金刚石粒度为25μm的直径22 mm、厚度20 mm的超大孔径聚晶金刚石拉丝模具为例,进行单向走丝电火花线切割加工定径区、压缩区和安全角的工艺研究,得出了加工工艺曲线,确定了最优加工工艺参数,提高了粗加工效率,确保了良好的孔形精度。结果表明:选择脉冲宽度4μs、脉冲间隔40μs、峰值电流15 A、走丝速度10 m/min时,可获得较满意的加工效果。 相似文献
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State of the art in wire electrical discharge machining (WEDM) 总被引:9,自引:1,他引:9
K. H. Ho S. T. Newman S. Rahimifard R. D. Allen 《International Journal of Machine Tools and Manufacture》2004,44(12-13):1247-1259
Wire electrical discharge machining (WEDM) is a specialised thermal machining process capable of accurately machining parts with varying hardness or complex shapes, which have sharp edges that are very difficult to be machined by the main stream machining processes. This practical technology of the WEDM process is based on the conventional EDM sparking phenomenon utilising the widely accepted non-contact technique of material removal. Since the introduction of the process, WEDM has evolved from a simple means of making tools and dies to the best alternative of producing micro-scale parts with the highest degree of dimensional accuracy and surface finish quality.Over the years, the WEDM process has remained as a competitive and economical machining option fulfilling the demanding machining requirements imposed by the short product development cycles and the growing cost pressures. However, the risk of wire breakage and bending has undermined the full potential of the process drastically reducing the efficiency and accuracy of the WEDM operation. A significant amount of research has explored the different methodologies of achieving the ultimate WEDM goals of optimising the numerous process parameters analytically with the total elimination of the wire breakages thereby also improving the overall machining reliability.This paper reviews the vast array of research work carried out from the spin-off from the EDM process to the development of the WEDM. It reports on the WEDM research involving the optimisation of the process parameters surveying the influence of the various factors affecting the machining performance and productivity. The paper also highlights the adaptive monitoring and control of the process investigating the feasibility of the different control strategies of obtaining the optimal machining conditions. A wide range of WEDM industrial applications are reported together with the development of the hybrid machining processes. The final part of the paper discusses these developments and outlines the possible trends for future WEDM research. 相似文献