When the assembly concentricity between the drive motor and the reducer is ensured well, the output shaft of the drive motor only bears rotational force (torque), and the operation will be smooth without pulsation. When they are not concentric, the output shaft of the drive motor also has to bear the radial force (bending moment) from the input end of the reducer. The action of this radial force will force the output shaft of the drive motor to bend, and the bending direction will continue to change as the output shaft rotates. If the concentricity error is large, the radial force will increase the local temperature of the motor output shaft, and its metal structure will continue to be destroyed, which will eventually cause the drive motor output shaft to break due to local fatigue. So, when the WPWEDKO135-200,WPWEDKO155-250,WPEEA40-70,WPEEA50-80,WPEEA60-100 planetary reducer has a broken shaft, how to effectively solve it?
01: Design the welding groove and gap before welding. Before welding, the broken part of the reducer needs to be smoothed. In order to reduce the welding stress, Certain measures also need to be taken in the welding groove: First, the U-shaped groove should be designed according to the fracture situation and the diameter of the component. The groove is generally 20mm wide and 37mm deep. The groove shape should also be consistent. After the fracture surface is smoothed, a forming turning tool is used for bevel processing. In order to avoid stress concentration, all parts of the groove should be rounded to reduce the proportion of the base metal melting into the weld metal and prevent the recurrence of welding cracks.
The welding gap also needs to be moderate. If it is too small, it will easily cause defects, and if it is too large, it will easily burn through. 02: Cleaning is necessary before welding. Before welding, all rust, oil stains and oxide scale on the surface of the broken shaft must be removed. Flame baking can be used to remove water droplets, oil and other stains, and then manual gauze is used to polish the rust and oxidation. The leather can be cleaned directly with a grinder, and ethanol can be used to clean some stubborn stains. 03: Precautions during welding: When welding, a positioning block should be added to the groove to prevent welding deformation and ensure equal welding gaps. Positioning spot welding should be done on both sides of the positioning block to avoid shaft deformation, and the cooling of the welding area should also be reduced. speed to prevent cracks. After each layer of welding, the welding seam should be visually inspected. If there are pores, cracks and other defects, it needs to be cleaned again and repaired again.
04: Handling and processing after welding After welding, wet cotton quilt should be used to cover the reducer to keep it warm, so as to reduce the degree of hardening and avoid fragility. If you need to eliminate the welding force, you can use a flame to heat the welding area to 350-550 degrees, and then bury it in white ash and slowly cool it until it cools to normal temperature. After checking that the appearance is flawless, just adjust the end face of the output shaft welding part to the required size. This method of repairing a planetary reducer is not only simple, effective and practical, but the most important thing is that it is low cost, and the working condition after welding will not be any different from that of a new reducer, and it can be used normally. Once the planetary reducer has a broken shaft, don't worry, just follow the above repair aspects.
