中心轴铣刀高速进给机构.docVIP

中心轴刀具的高速进给机构 高速切削刀柄系统。加工中心主轴与刀具的连接大多采用7b24锥度的单面夹紧刀柄系统,iso、cat、din、bt等都属此类。用在高速切削加工时,这类系统出现了许多问题,主要表现为:刚性不足、atc(自动换刀)的重复精度不稳定、受离心力作用的影响较大、刀柄锥度大,不利于快速换刀及机床的小型化。刀具材料。高速切削加工要求刀具材料与被加工材料的化学亲合力要小,并具有优异的机械性能和热稳定性,抗冲击、耐磨损。目前在高速切削中常用的刀具材料有单涂层或多涂层硬质合金、陶瓷、立方氮化硼(cbn)、聚晶金刚石等。 High speed cutting tooling system. The connection of machining center spindle and the tool is used mostly 7 b24 taper single clamping handle system, iso, cat, din, bt and so on all is such. When used in high speed machining, such systems have appeared many problems, main show is: the insufficient rigidity, the repeat precision of atc (automatic tool changer) is not stable, are greatly influenced by the centrifugal force role, taper shank with big, is not conducive to rapid change and miniaturization of machine tool. Cutting tool materials. High-speed cutting processing cutting tool materials and processed materials chemical affinity, and have excellent mechanical properties and thermal stability, impact resistance, resistance to wear and tear. Now commonly used in high speed cutting tool material more than single coating or coating hard alloy, ceramic, and cubic boron nitride (CBN) and polycrystalline diamond. 　 　(2)高速切削刀具结构。高转速引起的离心力在高速切削中会使抗弯强度和断裂韧性都较低的刀片发生断裂,除损伤工件外,对操作者和机床会带来危险。因此,高速切削刀具除了满足静平衡外还必须满足动平衡要求。动平衡一般对小直径刀具要求不严,对大直径刀具或盘类刀具要求严格。外伸较长的刀具,必须进行动平衡。另外需要对刀具、夹头、主轴等每个元件单独进行平衡,还要对刀具与夹头组合体进行平衡。最后,将刀具连同主轴一起进行平衡。但目前还没有统一的平衡标准,对iso1940-1标准中的平衡质量g值为平衡标准也有不同的看法,有的企业以g1为标准(所谓g1,即刀具在10 000r/min回转时,回转轴与刀具中心轴线之间只允许相差1lm),有的以g215为标准。高速切削时,为了保持刀具每齿进给量基本不变,随着主轴转速的提高,进给速度也必须大幅度地提高。 (2) the structure of high speed cutting tool. In high speed cutting caused by the high speed centrifugal force can make the bending strength and fracture toughness are lower blade fracture occurs, in addition to the damage to the workpiece, will bring danger to the operator and machine tool. High speed cutting tool, therefore, in addition to meet the static balance must also meet the requirements of dynamic balance. Dynamic balance genera