The third stage is blocked Block Honing cutting stage , continue honing stone and the bore surface when the contact area increases, fine stone chips stacked in between the hole wall and easily removed, resulting in blockage stone , becomes very smooth. Therefore Whetstone cutting ability is extremely low, equivalent to polishing . If you continue honing stone blockage caused severe adhesion clogged, Whetstone completely lost the cutting ability and a serious fever, hole accuracy and surface roughness are affected . You should end soon honing . This is due to the constant pressure feeding quilting grinding, the third case is inevitable. Optional quilting quantitative feed grinding, mechanical expansion integrated quilting grinding rod . Honing quantitative feed , the feed mechanism at a constant feed rate of expansion , the abrasive forcibly cut the workpiece . Therefore, cutting off the honing process and there is only broken cutting , cutting can not clogging phenomenon . Because when the cutting force decreased stone clogging , the feed amount greater than the actual grinding , honing pressure increased at this time , so that the abrasive grains fall off , crushing, cutting action increased. Honing with this method , in order to improve the hole accuracy and surface roughness , is not the last available feed honing some time.
Block Honing plating and sintering. Electroplated grinding wheel is trimmed outset made the correct shape, and has been used until exhausted. EDM is usually sintered metal wheel trim, and then plated wheel like that fitted to the machine to use. Sintered and electroplated grinding wheel spindle attached to the radial runout should be less than 0.0125mm. Metal bonded grinding wheel, it is very important to reduce the spindle runout. Because the binding agent from the abrasive grains projecting from the small, if the beating reaches 0.025mm, one end of the grinding wheel occurs and the heavy load has caused excessive wear, the load is light and the other end is still sharp. Some plating wheel contours can be produced very small radius (approximately 0.125mm). But most of the plating wheel contour radius greater than 0.5mm. Typically, plating wheel used in high-speed grinding wheel for grinding and metal sintered ceramic materials. Overall metal bonded grinding wheel vibration, beating and coolant flow to adapt to a small range of working conditions. If the grinder, less rigid workpiece and fixture, or the old machine bearings poor state, and there is no balancing device on the machine, such conditions can cause problems plating wheel wheel life, workpiece surface finish and texture aspects. According to machine vibration and stability of other specific circumstances, sometimes using resin bonded grinding wheel is better. Resin binder has a strong vibration damping capacity. Of course, equipment and time correction and resin grinding wheel dressing involved, it will increase costs.