In the metal cutting process, there are many error factors that affect the dimensional accuracy of the workpiece. Some of these factors are related to the process system, and some are related to the cutting process. However, various error factors do not occur under any circumstances, and in different situations, their degree of directionality is different. Below we briefly analyze the influence of the spindle error of the machine tool on the machining accuracy. 2The influence of the spindle rotation error on the machining accuracy 21 The influence of the pure radial runout on the machining accuracy In the case of the boring, if the spindle has pure radial runout, the axis line will be harmonically symmetrical in the direction perpendicular to the 1 coordinate axis. The linear motion has the same frequency as the spindle speed. The harmonic amplitude is at a certain moment, the file is at the angular position of 9, and the center of the spindle is offset from the center of rotation, and the point is offset by an angular velocity from the spindle. Radius 7 produces a radial error. The harmonic motion of the main axis is assumed to be in the horizontal direction, so the maximum offset at the center of the spindle is 9, = 712, 9 = 0. When the =, the boring tool tip passes its horizontal position. Then, when the boring tool is rotated again, the horizontal component of the tool nose trajectory + cos9 its vertical component can be obtained according to the horizontal component and the vertical component. When the spindle rotation has a pure radial runout error, then the spurt The holes will be elliptical. 1. Mast 2. When the boring tool is turning the outer circle, the instantaneous offset distance of the center of the spindle has little influence on the workpiece after machining. It can be seen from 2 that, for example, the instantaneous offset distance of the center of the spindle rotation, the error component in the two directions is, and the resulting radius error is that when the AjRlWAz21 is machining the thread, the single pitch is set due to the axial movement of the spindle. The radius of 0.0.1 is completely negligible, but the component of the phantom in the radial direction has a direct influence on the radius. It is transformed into the machining error by the relationship 2=, and the radial runout error of the spindle of a precision lathe should be controlled at 5. In factory 1. 22 Axial turbulence affects machining accuracy The axial yaw of the spindle has no effect on the machining of the inner and outer cylinders. However, at the end of the vehicle, if the main shaft has axial sway, the end surface is not perpendicular to the outer circle. 3. The perpendicularity of the end face to the axial line increases as the cutting diameter decreases. The amplitude of the axial yaw of the spindle; the radius of the workpiece end face; the bevel angle of the cutting end face. 2.3 The effect of pure angle swing on machining accuracy If there is a pure angle swing in the spindle of the lathe, a cone is produced in the outer circle of the car instead of the cylindrical surface. When the hole is bored, the hole that is thrown out will be elliptical. 3 Conclusion From the above analysis, it can be known that the rotation precision of the spindle selects the bearing with the corresponding precision according to the level of the machine tool precision. It is necessary to determine the accuracy of the relevant parts such as the journal bearing seat adjustment nut and the journal and inner ring support. The tolerances of the seat hole and the outer ring are required to be proved. Only when the spindle support hole and related parts are manufactured and assembled accurately, the high-precision bearing can play its role, and the spindle can obtain high rotation precision. Research on the failure of the hoist drive system has been carried out Recently, the Jining Coal Mine of Yanzhou Mining Group has carried out research on the failure and treatment of the mine hoist drive system and achieved good results. The mine 88 type hoist is equipped with a set of three full-bridge bridge converters formed in parallel with a ten-pulse DC drive speed control system, and its converter drive control system consists of a drive system computer current system computer and an excitation computer. During the use process, the following situation occurred: The squad over temperature alarm and the emergency stop occurred in the parking state; the hoist stopped during the operation and the converter tripped. After in-depth study and judgment, the human-independent converters belonging to the analog input port are damaged, and the actual value of the current is changed, causing other parameter values ​​to jump, thus affecting the change of the forward temperature value; the terminal block of the digital output board of the control cabinet is loose. Or the control cabinet fuses the fuse that supplies power to the drive system computer. take (Finish) Batcher Machine,Batcher Plaiting Machine,Fabric Relax Machine,Plaiting Machine ZHEJIANG LIANKE MACHINERY CO.,LTD , https://www.zjlinkmachinery.com