Numerical control lathe spindle bearing detection
Numerical control lathe spindle bearing test release date: 2019 - 12 - 31 author: click: small CNC lathe spindle bearings generally adopt angular contact ball bearing, micrometer is used to inspect bearing inner diameter and thickness, compared with national standard is in accordance with the requirements. Measuring angular contact ball bearing inner and outer ring thickness difference, adopting lever micrometer ( Dial indicator) , magnetic table, 100 mm long standard block 3 pieces of 1 piece, marble slab, 100 mm x 100 mm x 20 mm parallel block 1. Tablet, three standard block 6 face, parallel to the magnetic table base, block under the clean, the standard distribution of 120 ° on the tablet, angular contact ball bearing up on top of standard block (top of the Measured angular contact ball bearings to clean, uniform rotation, may be slightly within the raceway sundry) , magnetic table on the parallel block absorption, will leverage on dial gauge head towards the mouth under the angular contact ball bearing outer ring end surface, make the lever micrometer head down 0 chang 4 mm or so, read the dial indicator reading and record. With handle gently push the parallel block together with the magnetic table c2: in a move to the mouth inner ring face under angular contact ball bearing, read the dial indicator reading and record, calculate the difference between two sets of readings X, namely reading large end face low X smaller than reading. Such as the dial gauge head for - in outer end face reading 0 chang 014 mm, inside face reading is 0, this shows that the inner ring end face is lower than outer end face 0 chang 014 mm ( The inner ring end face than outer end face close to the flat surface 0 chang 014 mm) 。 Bearing, in turn, placed the same, will leverage dial gauge upside down in angular contact ball bearing outer ring end face and the upper side header pressure 0 chang 4 mm or so, read the dial indicator reading and record. Then moved to the inner ring end face read the dial indicator reading and record, calculating difference between two sets of readings Y, namely reading large end face Y higher than reading the small face. Such as micrometer head in the reading of the outer end face of 0 chang 014 mm, inside face reading is 0, this suggests that the angular contact ball bearing a flowing within the end 0 chang 014 mm lower than the outer end face. Using the above process in symmetrical four measuring points on the circumference of a circle, measured values for the same, if measured on four points vary by 0 chang 01 ~ 0 chang 02 mm can also be used, if the difference is too big, the bearing is unqualified. And so on for all bearing numerical measure the two groups. Measured after every dish bearing condition, consistent to be equipped with two sets of bearing ( Height difference within 0 chang 02 mm can) Same direction assembly so that we can ensure that the two plate of bearing inner and outer end face all contact no clearance ( This is very key) 。 To measure the third set of bearing fluently and lower height difference, at this point you can consider the third set bearing and bearing of two before the assembly time interval set size in back to back. Inside the casing and the outer casing and the other is the same thickness depends on the third set of bearing a plate bearing the height difference of back to back. When two sets of back-to-back bearing to 0, both internal and external ring height difference inside and outside the ring thickness are the same. When two plates bearing, back to back with a plate of bearing outer ring inner circle minus tolerance, the thickness of the inner ring thinner than the thickness of the outer ring a tolerance value. When the numerical control lathe in two back-to-back bearing outer ring is minus tolerance than inner ring, inner ring thickness is thinner than the thickness of the outer ring of two tolerance values. When the bearing outer ring than the inner ring plus tolerance, algorithm and vice. Bearing between inside and outside the circle have combined with pressure, to ensure that the outer ring of inner ring and outer ring, with no clearance between inner ring, and a pre-tightening force, clearance of 0 pretightening chang 03 ~ 0 chang 4 mm ( 240, Yue Yue 340). 150 bearing pre-tightening force, less than Yue clearance of 0 02 mm.