What are the general phenomena of the failure of the electric spindle of the CNC grinding machine, what is the principle of the failure, and how to clear the failure? As a 37-year CNC grinding machine electric spindle bearing manufacturer, Sanli will make a comprehensive analysis for everyone: (1) Fault inspection During the process of investigating the failure of the spindle not to rotate, the fault points are as follows: ①The rolling bearings used in the CNC grinding machine electric spindle are not predicted. tight. ② The hexagon socket head screw at the top of shaft I is loose. ③ The inner cavity of the hollow shaft is damaged. ④The shaft sleeve is cracked. ⑤ The adjusting nut is grinded to death. (2) Fault analysis The main shaft does not rotate, and the hexagonal socket head screw in the shaft is loose. During the high-speed operation of the main shaft, the operation of the shaft II and the gasket cannot be synchronized, and the gasket will rotate to the internal structure of the shaft II. The raw materials of the sheet and the shaft II are different, and the gasket is harder than the shaft II. The main shaft often works like this, resulting in damage to the inner collar of the shaft II, and at the same time the distance between the inner collar of the shaft II and the sleeve port is reduced, but the distance between the shaft sleeve in the shaft I and the left port of the gasket remains the same, so It is prone to 'shaft elongation', causing the rotor shaft to be pre-tightened as a whole, and the axial movement is 0.5mm, which also leads to the deviation of the parallelism between the axis I and the axis II. The shaft I and the shaft sleeve are tightly fitted, and the split of the shaft sleeve enables the shaft sleeve to rotate around the shaft I, so that when the main shaft rotates at high speed, the operation of the shaft I and the shaft II cannot be synchronized, resulting in too much load on the electric spindle , the amount of current expands. If the electric spindle works like this for a long time, it will also cause the electromagnetic coil to burn out, the electrical components will age, and the service life will be shortened. Sanli CNC grinding machine electric spindle bearing engineers suggest that you adopt the following troubleshooting methods: 1) Preload the rolling bearings at both ends of the spindle. 2) It is used as the shaft sleeve in the shaft I, and it is hot-fitted on the shaft I. 3) It is used as a gasket in shaft II, its thickness is increased by 5mm, and a groove is milled close to the end of the bearing with a depth of 2mm (the groove depths are 0.5mm, 1mm, 1.5mm and 2mm respectively during the trial). It is used as the adjusting nut in the shaft II (as shown in Figure 6). 4) Explore the installation method of the special electric spindle, and equip it with a special adjustment tool. Only when the torque is accurate can the rotation be stable! (http://)
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