The WHS200-50-10 worm gear reducer needs to be re-run-in after replacing the bearing, and the no-load + load step-by-step run-in must be performed according to the specifications. The core is to make the new bearing fit closely with the journal and seat hole, and at the same time adapt to the meshing state of the worm gear to avoid early wear of the new bearing. The specific requirements are as follows:
1. Core conclusion: Running-in is necessary after replacing the bearing. This model is a medium-to-large, low-speed, high-torque machine. There is a microscopic fit gap between the new bearing and the journal and seat hole. Running-in can eliminate the fit deviation, allow the lubricating film to adhere evenly, and at the same time check for assembly hazards. It is a key step to ensure the life of the bearing and cannot be omitted.
2. General principles of running-in: first no-load and then load, first low speed and then rated speed, load step by step, monitor temperature rise, abnormal noise and vibration throughout the process, stop the machine immediately for troubleshooting if there is any abnormality, and it is strictly prohibited to run directly at full load
3. The first step: no-load running-in (essential foundation, cannot be skipped)
3.1 Prerequisites for running-in: After replacing the bearing, add a sufficient amount of worm gear special oil, and the oil level reaches the center line of the oil mark; recheck the coaxiality and end cover tightness to see if there is no looseness or leakage; remove the load end connection and only connect the motor
3.2 Running-in parameters: No-load operation at rated speed, running-in time is 60-90 minutes, during which data is recorded every 15 minutes
3.3 Monitoring points: The temperature rise of the bearing part is ≤40°C, there is no abnormal metal sound, and there is no obvious vibration; the shaft end runout is ≤0.02mm, and there is no axial movement exceeding the standard; there is no leakage on the box joint surface and the shaft end.
3.4 Post-run-in treatment: After no-load running-in, stop the machine and cool it to normal temperature. Check the oil level to see if there are any metal debris in the oil. Tighten the end cover and box bolts to check for looseness.
4. Step 2: Load running-in (core key, adapting to working conditions)
4.1 Prerequisite for running-in: No-load running-in can only be carried out after passing the test. The load can be gradually connected. Full load at one time is prohibited.
4.2 Step-by-step execution of running-in
Light load running-in: load to 30%-50% of the rated load, run at rated speed for 60 minutes, monitor the bearing temperature rise ≤55℃, and there is no abnormal noise or leakage
Medium load running-in: load to 70%-80% of the rated load, run at rated speed for 120 minutes, monitor the bearing temperature rise ≤65°C, and the meshing is smooth and without impact.
Rated load running-in: load to 100% rated load, run for 2-4 hours (this model with low speed and high torque can be extended to 6 hours), monitor the bearing temperature rise ≤70℃, noise ≤75dB
4.3 Core taboos for load running-in: Overload running-in is strictly prohibited, frequent starts and stops are strictly prohibited, and the rotation speed is strictly prohibited to rise and fall to prevent new bearings from bearing impact loads.
