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张猛 《机械工人(热加工)》2004,(4):76-79,89
锻造是金属在塑性状态下所完成的体积成形,通常是作为制造业金属零件的制坯工序。所以,锻件多半留有切削加工余量,即往往还需要切削加工(车、铣、刨、镗、磨等)才能变为成品。因而锻件所留余量的多少,不仅决定了切削加工的工时和废料量,而且还包含着对金属零件表面的破坏程 相似文献
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不断创新与发展的品牌
伊斯卡(ISCAR)公司是世界上最大的金属切削刀具生产厂家之一,总部设在以色列.其子公司及代理机构遍及全球50多个国家,可全方位地为客户提供高质量.高精度的刀具产品,从而大大地降低了金属加工行业的成本,产品具体包括切槽、车、铣、镗、钻、铰、刀柄系统等全系列刀具,在为模具、汽车、 相似文献
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氧化铝系陶瓷刀具材料性能及应用长春大学钟声,苗忠刀具在金属切削过程中起着主导作用。刀具材料的性能和质量不同.其切削性能相差很大。随着科学技术的不断发展、要求机械零件具有高强度、高硬度、高精度、高耐磨性、高耐热性能。因此在要求切削刀具能进行车、铣、镗(... 相似文献
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今年第六届中国数控机床展览会(CCMT2010)上,重型机床产品经过升级换代,发生很大变化,不仅外观更加宜人,性能、精度也得到很大提高,彰显实力。其中车、铣、镗、磨、齿轮加工、加工中心、成形机床、特种加工机床等各类大型、重型数控机床展品约200余台套。 相似文献
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在摆线针轮减速机中,针轮是由针齿壳、针齿销、套3种精密零件组成;在摆线曲面的线形探索中,找到了摆线的法线运动规律,设计出摆线的法向导杆机构,用普通圆柱铣刀和砂轮沿法向导杆进给和切削,准确地创成加工各种摆线及其等距曲线.从而可以制造出纯滚动啮合的外齿和内齿摆线轮,使得由十几以致上百个零件组成的针轮只需一个内齿摆线轮取代,进而制造没有针轮的摆线减速机,使减速机的效率显著提高,单级的最大减速比由现在的87提高到200以上. 相似文献
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XIANG Wenjiang ZHOU Zhixiong CAO Zhaozhan YAN Lan 《机械工程学报(英文版)》2007,20(6):9-12
Based on the principles of differential geometry and kinematics, a mathematical model is developed to describe the grinding wheel axial cross-section with the radial cross-section of the flute in a given drill under the basic engagement condition between the generating flute and the generated grinding wheel (or disk milling tool). The mathematical model is good for the flute in the radial cross-section consisting of three arcs. Furthermore, a CAD system is also developed to represent the axial cross-section of the grinding wheel (or disk milling tool). With the system, the grinding wheel (or disk milling tool) axial cross-section that corresponds to the three-arc flute cross section can be conveniently simulated. Through the grinding experiment of drill flutes, the method and the CAD system are proved to be feasible and reasonable. 相似文献
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Adiyaman Oktay Savas Vedat Baday Şehmus 《The International Journal of Advanced Manufacturing Technology》2018,99(9-12):2231-2244
“Grinding Mechanism having Advanced Secondary Rotational Axis” (GMASRA) is one of the newer plane surface grinding methods that have an uncommon abrasion mechanism. Unlike conventional methods, in GMASRA, there are two rotations of a wheel. The first rotation is the same as in conventional grinding methods, which is the circumferential rotation. The other rotation is the newly developed axial rotation, where the wheel rotates around itself perpendicular to its radial axis. In this study, the effects of certain cutting parameters on arithmetical mean deviation of the assessed profile (the Ra parameter) were investigated. Particularly, the effects of cutting parameters on Ra in the GMASRA grinding process were examined. The selected cutting parameters were the depth of cut, the number of axial revolutions of the wheel, and the stepover distance of the wheel. Five wheels with different properties were chosen. Additionally, GMASRA was modeled using the Taguchi orthogonal test design. In this orthogonal design, the depth of cut, the spindle speed, and the type of grinding wheel were chosen as the control factors. The effect of the specified control factors on the surface roughness was demonstrated using an analysis of variance (ANOVA) test. Results show that GMASRA produced better Ra values than the conventional method. Ra values were very close to each other in every part of the ground workpieces. According to the modeling results, the spindle speed had the highest effect on Ra, followed by the depth of cut and the type of grinding wheel. GMASRA is also very cost effective and can be adapted to most milling machines and CNC milling machines. 相似文献
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E.-S. Lee 《The International Journal of Advanced Manufacturing Technology》2000,16(11):814-821
In recent years, grinding techniques for precision machining of brittle materials used in dies, moulds and optical parts have
been improved by using superabrasive wheels and precision grinding machines. Optimum dressing using a superabrasive wheel
makes possible the effective ultraprecision grinding of die steel (STD-11). In this study, a new system and the grinding mechanism
for optimum in-process electrolytic dressing are proposed. This method can carry out optimum in-process electrolytic dressing
of a superabrasive wheel. Optimum in-process electrolytic dressing is a good method for obtaining efficiency and ultraprecision
grinding of STD-11. 相似文献
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《机械工程学报》1981,17(1):26-36
本文阐述了缓进给磨削的特点。这是一种新型的平面磨削加工工艺,缓进给磨削时,砂轮的切削深度大,金属切除率高,比普通磨削高100~1000倍。它可有效地用于型面或平面磨削,并能在一次或几次行程内磨完全深,无须进行诸如铣、刨等粗加工工序。本文还论述了缓进给磨削23000千瓦燃气轮机叶片根槽的机床、砂轮、金刚石滚轮、冷却液的应用以及工艺和磨削机理等。缓进给磨削中关键的问题之一是大面积烧伤和裂纹的产生。因而,本文还叙述了缓进给磨削的切屑形成机理。试验结果表明,当出现烧伤时,工件上的温度由通常的100~130℃会突然上升到1000℃以上。正确选择砂轮、进给速度及冷却液的供应,可以控制工件表面光洁度、形状和公差。 相似文献
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不同类型CNC五轴工具磨床的运动参数转换原理 总被引:1,自引:0,他引:1
详细分析了CNC五轴立式砂轮平动工具磨床 (P型 )和砂轮摆动工具磨床 (B型 )的运动形式及其加工原理 ,并将之与传统机床进行了比较 ;从所要求的同一个几何参数刀具具有相同的几何本质出发 ,给出了P型和B型 2种类型CNC工具磨床的内在运动参数的转换关系。研究阐明了在刀具磨削成形的过程中 ,控制每个瞬时砂轮几何体和工件几何体在空间的相对位姿和相对运动趋势是精确成形的关键。 相似文献