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目前国内中小规模的工具厂生产小直径(φ0.5～φ6)麻花钻,其螺旋沟槽的铣磨加工,一般在小型工具磨床上配置两种类型的铣磨装置:一种采用分度头带一组挂轮及减速传动装置实现麻花钻一边旋转、一边进给运动,来完成小直径麻花钻螺旋沟槽的加工;另一种采用螺旋运动,把麻花钻装夹在相应螺纹螺距的螺杆上,通过转动螺杆仿形实现对麻花钻螺旋沟槽的加工。对比以上两种方案:前者传动稳定、磨损小,但由于齿轮传动中侧隙的存在,其传动精度,特别是反向定位精度较低,且生产效率也很低,而后者的优点是效率较高,传动精度,特别是反身定位加工精度较高,但由于螺纹丝杠传动本身磨损,尤其在铣磨加工过程中金属粉尘进入装置传动部分,从而加速螺纹丝杠副表面的磨损,导致传动、定位加工精度下降,废品率增加。针对上述状况,我们根据南京刃具厂的要求,设计了能提高传动定位加工精度、抗磨损且效率高的小直径螺旋沟槽铣磨装置(见附图)。
Currently small and medium-sized tool factory production of small diameter (φ0.5 ~ φ6) twist drill, the spiral groove milling, the general configuration of small tool grinder on the two types of milling device: a sub-head With a group of hanging gear and deceleration gear to achieve twist while drilling while feeding movement to complete the small diameter twist drill spiral groove processing; the other with a spiral movement, the twist drill installed in the corresponding thread pitch screw , By turning the screw profile to achieve twist drill twist groove processing. Contrast the above two programs: The former transmission stability, wear small, but because of gear drive in the presence of backlash, the transmission accuracy, especially the reverse positioning accuracy is low, and the production efficiency is very low, while the latter has the advantage of more efficient In particular, the high accuracy of the anti-body positioning processing, but due to wear and tear of the threaded screw drive itself, especially in the milling process of metal dust into the transmission part of the device to speed up the wear and tear of the screw thread on the surface, resulting in transmission, Positioning accuracy decreased, the rejection rate increased. In response to the above situation, according to the requirements of Nanjing Cutting Tool Factory, we designed a small diameter spiral groove milling device that can improve the machining accuracy, wear resistance and high efficiency of the drive positioning (see the attached drawings).