2.CBN grinding wheel in the hole in the application　Internal grinding efficiency

has been very low, the main reason is the grinding speed, grinding wheel

material and the rigidity of the problem.Production process used in dressing

wheel, grinding wheel replacement time accounted for almost a single piece of

work time1/3 to 1/5.If the inner or groove grinding using CBN electroplated

grinding wheel, and the wheel speed, increasing the diameter of the grinding

rod,can be properly increased workpiece speed and feed rate, not only can 

guarantee the hole (arc) diameter, groove width size and shape Bit accuracy,

surface roughness and avoid burns, but also can be doubled to improve processing

 efficiency and reduce processing costs.Such as a domestic factory processing

an annual output of 600,000 textile machinery rolling bearing sets, grinding

φ15.5 +0.04 the hole and the adjacent arc groove, in the past with chrome

corundum (GG) wheel, need to use two processes in two M224 internal grinding

machine, the slot (arc) diameter difference and the size and hole concentricity

is difficult to ensure, and low efficiency, the use of CBN wheel, the coarse

grinding rod, increased feed, saving trim And then changed to hole, groove at the

 same time grinding, that is, in the grinding rod installed two grinding wheel,

 so that the grinding efficiency increased by 1 times, saving a grinding

machine.The surface roughness of the workpiece is Ra0.63μm. The grinding process
parameters are as follows: υ = 36m / s, υ2 = 19m / min, f = 1μm / r, f = 

0.5μm / r,Time t = bs, with 10% concentration of the emulsion value.