Causes and treatment of motor shaft fracture
（1)motor shaftThe main cause of fracture
①motor shaftSevere vibration, even when running under overload, the dynamic load will increase, which will cause shaft fatigue and fracture.
②The step difference formed due to the different shaft diameters causes the cross section of the shaft to change suddenly, or there is a keyway on the shaft, which causes the stress to concentrate on the shaft and break.
③motor shaftFrequent start-up or too fast start-up speed will cause shaft fracture.
④ The carbon, silicon and sulfur components in the shaft material are too high, which will cause cracks or deformation during tempering and increase brittleness.
In addition, during the forging process, defects in the shaft material (such as crystal segregation, carbide segregation, etc.) will not change shape, and will expand and form cracks during subsequent quenching and tempering, thereby makingmotor shaftThe strength did not reach the required strength and was damaged during operation.
（2)motor shaftManufacturer's processing method
① Motor outputmotor shaftCountermeasures after serious fracture outside the box: must be replaced with newmotor shaft.
② The external fracture depth of the motor output shaft box does not exceed the shaft diameter10%, maintenance countermeasures when spare parts are missing: welding is possible. After welding, continue to run for a period of time. Welding methods and technical requirements shall be implemented according to relevant regulations.
The motor high speed shaft or gear shaft fracture countermeasures: must be replaced with newmotor shaft.
motor shaftManufacturers commonly used shaft: reducer shaft, mobile phone shaft (flip or rotating screen mobile phone);Laptop axis; PortableDVDShaft; LEDDesk lamp shaft;LCDDisplay axis;GPSAnd other car support shafts, etc., at the same time, you can know his processing methods and what problems should be paid attention to during the processing, which must be considered during the processing.As follows:
（1) In order to ensure the machining accuracy of the shaft, usually rough machining should be carried out first, then finishing, and multi-stage machining should be carried out in stages. If necessary, the semi-finishing process needs to be arranged, and the machine tool equipment needs to be matched accordingly.
（2) Whenmotor shaftWhen there is a center hole at both ends, a standard center hole with a protective cone should be selected as much as possible.It has1200The tapered protective surface is suitablemotor shaftAnd the rotor assembly is clamped multiple times, so the shaft processing will not lose accuracy due to the damage of the center hole.National standards,BType center hole can only be larger than the shaft end diameter6 mmwhen used.The center holes at both ends should be machined using standard center drills and special machine tools to ensure the best quality.
（3)motor shaftThe processing of the key grooves, grooves and threads on the top should usually be carried out before the semi-finishing after finishing to prevent the shaft from receiving large cutting forces after finishing and causing bending deformation of the shaft.
（4) in order to improvemotor shaftThe cutting performance and dimensional stability after processing, the heat treatment process should be properly arranged before and after straightening, rough turning and semi-finishing turning. The type of heat treatment should be selected correctly.
Motor shaft
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2024-01-02
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