internal grinding wheel diameter is small

Compared with the cylindrical grinding , internal grinding machining accuracy , surface quality and production rate is poor. The reason is that the grinding has the following basic features :
 1 due to restrictions in the workpiece hole  standard abrasives diameter , internal grinding wheel diameter is small, but also by the speed of the grinder spindle speed limit ( usually 10000 ~ 20000r/min), general grinding wheel peripheral speed of less than 30 ~ 35m / s. Thus , productivity is better grinding surface roughness and cylindrical grinding .
 2 internal grinding wheel diameter is small, much higher speed than the cylindrical grinding wheel, the number of times it is time for each unit increase in the corresponding abrasive grinding participate than cylindrical grinding wheel tends to blunt the need regular trimming and replacement ( often trimmed wheel wear quickly ) , increasing the auxiliary time , affecting productivity.
 When three internal grinding , the  abrasive paper sheet workpiece aperture is smaller, then the long axis of the wheel installation is also smaller in diameter , but its large overhang length , so poor rigidity , prone to bending deformation and vibration grinding , affect the size of the workpiece, shape accuracy and surface roughness , but also limits the amount of grinding without help improve productivity.
 4 When the grinding wheel and the workpiece into contact with the inscribed circle , arc of contact is longer than the cylindrical grinding , internal grinding because in a semi- closed state, the coolant is not easy to enter the hole, directly into the ground harder DC wheel  to area, thus grinding , high temperature, easy to blunt abrasive wheel easy to plug , while the workpiece surface quality burns easily .
 According to the characteristics of the inner circle grinding , grinding holes in order to ensure the quality and increase productivity, must be reasonably connected to the long axis of the grinding wheel and choose correctly determine the amount of grinding , cutting fluids , and to improve the grinding process .