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 time 1/3 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 the replacement of grinding wheel time, completely solve the original problem. 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.


3. Grinding gear with CBN grinding wheel


Gear grinding is a single tooth surface and multi-tooth surface grinding, single tooth surface grinding can obtain high processing accuracy, but low efficiency, high cost, multi-tooth grinding although the production efficiency is high, but its processing The quality is worse than single tooth grinding. If CBN grinding wheel, whether using single tooth surface grinding or multi-tooth grinding, the use of electroplated CBN grinding wheel or ceramic grinding wheel, the effect is extremely significant:


(1) CBN grinding wheel can be made into high-precision tooth profile, because of high durability, not frequent dressing, do not often adjust the machine, access to a stable tooth gallery, lead and pitch accuracy.


(2) can achieve high-speed grinding and high feed rate grinding tooth surface, low roughness and will not burn, can improve the grinding efficiency under the conditions of high gear accuracy (6 to 7).


(3) The CBN grinding wheel has long service life, good grinding performance, saving a lot of auxiliary time such as grinding wheel replacement, machine adjustment and workpiece inspection.