Process and device for regrinding rolls installed in hot-strip roll stands

A device for regrinding a roll installed in a hot-strip roll stand, comprising:

• a housing;
• a rotating pot-shaped grinding tool movable in an oscillating manner parallel to an axis of the roll;
• a grinding shaft having a first end to which the grinding tool is fastened so as to be axially displaceable transversely to the roll, and a second end;
• means for rotating the grinding shaft;
• a grinding sleeve, the grinding shaft being coaxially arranged in the grinding sleeve;
• displacing drive means supported directly at the housing and connected to the second end of the grinding shaft for axially displacing the grinding shaft in the grinding sleeve, the displacing drive including an air cylinder with a rod supported in the housing by a ball guide, the air cylinder being guided in a force-regulated, low-friction manner;
• ball guides arranged between the grinding sleeve and the grinding shaft so that the grinding shaft is axially displaceable in a low-friction manner;
• and
• at least one additional air cylinder which is guided in a low friction manner and operatively arranged in the housing so as to counterbalance weight forces of the grinding tool.