1. Wheel mounting
Installed on the grinding wheel should pay particular attention. Because the high-speed rotating grinding wheel working conditions, should be carefully examined before use, do not allow cracks. Installation must be solid, and should be static balance adjustment to avoid personal and quality accidents.
Grinding wheel bore and between the cylindrical shaft or flange, not too tight, otherwise grinding thermal expansion, easy to wheel Splitting, nor too loose, otherwise prone to eccentric wheel, loss of balance, resulting in vibrations. Generally with the gap is 0. 1 ~ 0. 5mm, high speed wheel gap to be smaller. Clamping a wheel flange, the two flanges should have a diameter equal to the outer diameter wheel diameter should be not less 1/3. In between the flange and the wheel end applications such as cardboard or oil resistant rubber gasket to do so even pressure distribution, nut tightening force can not be too large, otherwise the wheel will break. Note fastening threads rotation, spin the wheel should be the opposite, that is, when wheel is rotated counterclockwise, with right-hand thread, so that the grinding wheel in force, will drive the screw nut more and more tightly.
2. Wheel balance
Generally have a diameter greater than 125mm a balance wheel, the wheel axis of rotation coincides with the center of gravity.
Unbalanced wheel rotating at high speed will produce vibrations affect the processing quality and precision machine tools, can also cause serious damage to the unit and wheel shatter. Difficulties caused by the imbalance of the original parts are mainly wheel uneven density, geometry, asymmetry and installation eccentricity. Therefore, the installation should be carried out before grinding wheel balancing, wheel balancing are two kinds of static equilibrium and balance. A case, only for static equilibrium, but in the high-speed mushroom cut (speeds greater than 50m / s) and high intensity grinding, it must be balanced. Balance will be mounted on the balance wheel arbor \ then kindly shaft mounted flat on the balance wheel balancing frame rails, wheel will swing back and forth until the swing stops. Balance wheel stationary in any position. If the wheel imbalance, it always go to the following heavier parts. Then the position of the movable counterweight to reach equilibrium. Good balance wheel mounted to the spindle before the first check for cracks, cracked wheel is absolutely prohibited. The installation should be fitted between the wheel and the flange of 0.5-2mm elastic pad: two flanges have a diameter, and their size is generally half the diameter of wheel. Grinding wheel and axle or stairs there should be a gap between the flanges to avoid thermal expansion of the grinding wheel spindle Splitting.
Wheel balancing approach: the wheel flange into the annular groove of a few balance block, by adjusting the position of the wheel balance weight center of gravity coincides with its axis of rotation.
3. Wheel dressing
During grinding wheel abrasive friction, compression, it gradually rounded blunt edges, or a ductile material in the grinding, grinding debris often impaction surface pores of the wheel, the wheel surface blockage, Finally the wheel lose cutting ability. At this time, will be generated between the grinding wheel and the workpiece slippage and may cause vibration and noise occurs, the grinding efficiency decreases, surface roughness deteriorated. Same time as the grinding force and grinding heat increases, will cause deformation of the workpiece and the grinding accuracy impact, severe cases cause burns and grinding the surface hairline cracks. In addition, uniform hardness and abrasive grinding wheel working conditions, uneven wear of the grinding wheel working surface, the number of parts of the abrasive grains ranging from falling, resulting in the loss of shape precision grinding wheel, the impact accuracy of the shape and surface roughness. Where you encounter this situation, the wheel must be trimmed, cut on the surface layer of abrasive, re-exposing the wheel surface finishing sharp grit grinding wheel cutting ability to restore and shape accuracy.
Diamond wheel grinding wheel used for trimming, diamond wheel with high hardness and wear resistance, is the main tool for wheel dressing.
