Although the metal processing industry without pressure  Honing Process  , but there are still such a process requirements. Sunnen honing rigidity developed before the procedure can reduce the undesirable dimensional changes caused by processing . Honing can improve the uniformity of the quality of the workpiece surface , the other trimming process can be produced in micro- cracks. However, only in the honing do not process it as a case of cutting only showing the above-mentioned advantages. In addition to honing grinding surface only slight bulge above the average peak , cutting depth does not exceed several tens of microns . Figure 3 shows the honing can significantly improve the surface quality . Figure 3 on the map is not the honing of the workpiece, its surface was rough serrated The figure is the same after honing surface . After honing the cylinder wall is to increase the contact pressure with the piston . When we compare the before and after contact with the surface brush honing ratio found brush honing surface after honing brush contact rate increased significantly in the absence of excessive resection material or damage the surface quality of the workpiece surface finish of the case raise a processing method . Brush honing the block is similar to a brush . Brush which contains abrasive nylon filament , which contains 40% of the honing material . The abrasive nylon filament can be Al2O3, SiC, BN or diamond , and other abrasives . Honing brush to form massive sales , the same as with conventional honing stone can be installed in a standard combination of honing head, a group of blocks brush honing honing under pressure at 40psi over 20,000 holes.