Repair Method for Dynamic Pressure Bearing of Centerless Grinder

Release time:2023-09-01

Centerless grinding machines, as a product of the combination of information technology and mechanical production technology, have become increasingly simple in factory grinding operations with the advancement of technology. We often see their presence when grinding workpieces in factories. In daily work, manual labor can cause physical discomfort, let alone machines. Do you know how to repair problems with the dynamic pressure bearings of the grinding machine? Next, let the editor take you to take a look.

Method 1:

When there are problems with dynamic pressure bearings, a combination of scraping and grinding is usually used to repair the bearings. When scraping, it is important to use a light scraping method and never scrape into fish scales.

Install the front and rear bearings in the working position, grind a cylindrical mandrel with a length of 400mm according to the bearing hole, apply a thin layer of red lead oil on the mandrel, thread the mandrel into the bearing, adjust the tightness of the front and rear bearings to the appropriate degree, and then roll the mandrel. Pull out the mandrel and lightly scratch the points.

This task must be repeated until the three rectangular strips on the inner surfaces of the front and rear bearings touch evenly and densely. Then, ink a cast iron grinding rod with a diameter 0.02mm smaller than the core shaft and a length 400mm, and apply W5 chromium oxide grinding paste to grind the front and rear bearings together. Tighten the front and rear bearings at any time and pay attention to removing the remaining grinding compound at the end of the bearing. By grinding, the three rectangular touch strips of the bearing can be made intact. After completion, remove the bearing seat and clean it thoroughly to ensure that there are no impurities left.

Method 2:

Install the front and rear bearings in place as required, and then grind a cylindrical core shaft with a length of 350mm according to the bearing hole. The degree of cooperation with the bearing inner hole should be suitable for the rigidity to penetrate. Adjust the front and rear bearings to a stop when rolling is difficult. During the adjustment process, do not simply adjust one bearing. The front and rear bearings need to be adjusted alternately. Remember not to adjust one before adjusting the other. Grind the wheel journal with a precision of 0.01mm smaller than the diameter of this spindle, polish it, and then assemble it.

Fill in lubricating oil in order to conduct idle work experiments before and after installing the grinding wheel, and ultimately conduct grinding experiments. By grinding, the front and rear bearings have three rectangular contact surfaces with a width of 15mm corresponding to their outer cone flanges. In order to further reduce the roughness value of the bearing inner hole, we used toothpaste to polish it. After checking the final adjustment accuracy of the grinding rod, no significant changes were found, that is, subtracting 0.01mm from this diameter as the scale of the grinding wheel shaft journal.

Maintenance personnel should adhere to the maintenance standard of "outside first and then inside". That is to say, if a malfunction occurs, maintenance personnel should choose to inspect, smell, listen, ask, and touch the centerless grinder according to internal and external inspection.