Design And Research On Efficient Chip Removal System Of High-speed Deep Hole Processing

With the rapid development of modern manufacturing industry, deep hole processingtechnology is more and more widely applied in machine work. During the deep holeprocessing, because of its special technology, the long pathway of chip discharge, and thelimited space of discharge, a phenomenon of clogging is easily happened, which can cause adirect sudden interruption of the processing, an effect on the straightness of already machinedholes, and more worse a breakage of the blade’s cutting edge. So chip removal difficulty isalways one of the problems which affect the development of deep hole processing technology.The paper adopt the processing methods of workpiece rotation, the tool feeding androtation to realize high-speed drilling-cutting. It also make a research and design on the chipissue from both chip breaking and chip pulling, taking fully advantages of vibration drillingfor chip breaking and the effect of negative pressure pumping on the chip.In chip breaking, the relatively mature technique of vibration drilling is adopted torealize variable cutting-thick. A vibration device is designed which apply the vibration in thecoupling rather than a direct effect on the drill stem. Its vibration drive is made up of twoeccenters, and it can adjust the amplitude of vibration drilling. The vibration drive is mounteddirectly on the carriage. Between the carriage and the coupling, a small rail is used to connectthem, which could offset the non-axial force that acted by the vibration drive on the coupling,and will have no affect on the deep hole processing straightness.In chip pulling, the concept of variable negative pressure is raised by studying theprinciples of negative pressure chip pumping and its influencing factors. Through the flowperiodic variation in the negative pressure channel, the negative pressure value of the negativepressure region is thus changing, so that the suction force acting directly on the chip is changing. It not only becomes beneficial to the chip breaking, but also promotes the chipremoving. In order to achieve a variable flow, we design the converter. It is connected to anegative pressure channel, by changing its closure area in the channel to achieve the purposeof a variable flow. An improved design has been made on the negative pressure chip pumpingdevice aiming at the rotation of drilling stem.Finally, by combining the vibration drilling device and variable negative pressure chippumping device together, this high-speed and efficient chip removal system has been made, arealization of combining variable cutting-thick together with variable negative-pressure. Byadjusting the initial parameters of these two devices, the weakest part of drilling-cutting chipcorrespond with the maximum negative pressure, to achieve the chip breaking and chippulling, and improve the chip removing.