1. Cut the tube
In the process of cutting off the steel pipe, in addition to ensuring that the length of the roller shell is controlled within the specified range, it is also necessary to ensure the chamfering angle. The uneven chamfering of the pipe cutting machine will cause the stop of the car to not be in the center of the roller shell, resulting in the increase of the radial runout of the roller. If the shell length is greater than the requirements of the drawing, the size of the roller shell will be reduced when the shaft head protrudes out, which may cause the roller to not be placed in the roller frame.
2. Cut the deep tube
The main controlling factors of the car stop process are the depth of the stop and the diameter of the inner hole. The depth of the mouth is too shallow or too deep, resulting in the installation of the bearing seat is not in place, resulting in the increase of roller rotation resistance and the increase of the diameter jump of the roller. And the diameter of the stop mouth out of the car is greater than the requirements of the drawing, resulting in the bearing seats at both ends of the roller being uncentered, resulting in the increase of the roller rotation resistance, and the increase of the diameter jump of the roller; If the diameter of the stop is less than the requirements of the drawing, the bearing seat cannot be installed
3. Press-fit bearing housing
The bearing seat press-fitting is not in place, resulting in the misalignment of the bearing seat at both ends, resulting in the increase of roller rotation resistance and the increase of roller diameter jump.
4. Welding operations
When welding the bearing seat, the welding voltage and current are too large or too small, which will cause uneven welding, unsmooth, porosity, leakage welding, and welding nodules, which will affect the service life of the roller.
5. Compression bearing, compression seal
a. The bearing press-fitting is not in place or the bearing and the seal are press-fitting at the same time, resulting in excessive deformation of the seal, resulting in increased rotation resistance of the roller and inflexible rotation.
b. When press-fitting bearings and seals, the size of the shaft head protruding from both ends of the roller shell is asymmetrical, which does not meet the requirements of the drawing, which may cause the roller to not be placed in the roller frame.
6. Adjustment
Because the bearing and the seal are step-by-step press-fitting during the processing of the idler at this stage, the seal deformation or the sealing gap cannot be opened in the press-fitting process, the sealing gap needs to be opened by knocking the shaft head to ensure that the shaft can rotate flexibly, and the adjustment is not in place, resulting in the inflexible rotation of the idler and the increase of rotational resistance.
7. a car groove
a. The width of the trench car is too large, resulting in a large axial string, and the axle block is easily damaged after impact.
