Discussion on the problem of grinding the corrugation of the rotating shaft of the motor shaft (2)

The visible ripple is eliminated by multiple process tests. The main measures taken are as follows:

(1) Adjusting the grinding wheel

1 Pair of grinding wheel re-selection analysis For the material of the rotating shaft, after testing and analysis, it is found that the white corundum material is relatively soft and has good viscosity, which can obtain lower surface roughness value, but the cutting ability is poor, and the grinding wheel is easily blocked. . The chrome corundum material is very hard and suitable for fine grinding. It is not suitable for grinding materials with large margin and high hardness. Brown corundum is somewhere in between and is an ideal grinding wheel for grinding the shaft.

2 do a good job of balancing the wheel

a. When replacing the new grinding wheel, after installing the flange, first repair the outer circle on the horizontal lathe, then balance the balance, and install it on the grinding machine to repair the grinding wheel with a diamond pen. The best practice is to rebuild the grinding wheel, then balance the balance, and repeat it one or more times to reduce the unbalance of the grinding wheel to the best condition.

b. When installing the grinding wheel, care should be taken to make the contact between the taper hole of the grinding wheel flange and the taper surface of the spindle good. The two sides of the grinding wheel should be padded with the same thickness of paper to avoid the imbalance of the grinding wheel due to poor installation.

c. After stopping grinding and turning off the grinding fluid, continue to let the grinding wheel idle

5~7min, remove the residual grinding fluid on the grinding wheel by centrifugal force. Otherwise, after the machine stops for a certain period of time, the residual grinding fluid will solidify in the lower part of the grinding wheel, affecting the balance of the grinding wheel.

3 The grinding wheel is related to the sharpness of the grinding wheel due to the cutting resistance. If the grinding wheel is not sharp and the cutting resistance is increased, it is easy to lick the grinding wheel and generate ripples. Therefore, always pay attention to check the wear of the grinding wheel and keep the sharpness of the grinding wheel. It is recommended to use a natural diamond pen instead of a synthetic diamond pen to grind the grinding wheel for better grinding effect.

(2) Adjustment process In the season of high temperature, the operator is required to avoid the daily high temperature period as much as possible, and only the taper surface of the shaft is ground in the early morning to improve the working environment of the machine tool.

In the case of tight production tasks, the taper surface grinding process is changed from one clamping to the first coarse grinding and then fine grinding. Fine grinding allowance is controlled at 0.03~

Between 0.05mm. And the rough grinding was completed on the first day, and the fine grinding was carried out in the early morning of the next day.

In the summer when the temperature is high, the hydraulic oil of the machine tool is cooled by ice.

(3) Repair the tailstock In order to completely eliminate the equipment factors that may cause ripples, check the running condition of the grinding wheel spindle with a dial gauge. The pointer of the watch is almost motionless, indicating that the spindle factor can be eliminated. Through comprehensive analysis, it is confirmed that the tailstock accuracy error is an important source of ripple. Re-adjust the tailstock clearance by removing the tailstock and replacing the tailstock sleeve.

3. Conclusion

Through the above comprehensive analysis, we can see that the causes of ripples are various, but as long as we strictly look for the reasons according to the law of its occurrence and development, we can eliminate the visible ripple of the taper surface of the shaft. Ensure the quality of the product.

For more articles, please refer to "Metal Processing" Cold Processing 2008 No. 1

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