The outer circle of the workpiece is generally ground on an ordinary cylindrical grinder or cylindrical grinder. Cylindrical grinding generally has three methods: longitudinal grinding, horizontal grinding and deep grinding.
1. Longitudinal grinding method of cylindrical grinder: When the longitudinal grinding method grinds the outer circle, the high-speed rotation of the grinding wheel is the main movement. While the workpiece is in circular feed movement, it also moves longitudinally with the worktable to achieve the axial direction of the workpiece. Feed. At the end of each single stroke or each reciprocating stroke, the grinding wheel makes periodic lateral movement to realize the feed along the radial direction of the workpiece, so as to gradually grind away all the remaining grinding allowance in the radial direction of the workpiece. After grinding to size, perform a smooth grinding process without lateral feed until the spark disappears. Because the longitudinal grinding method has less radial feed per time, the grinding force is small, and the heat dissipation condition is good, it fully improves the grinding accuracy and surface quality of the workpiece, and can meet the higher processing quality requirements, but the grinding efficiency is low . The longitudinal grinding method is suitable for grinding larger workpieces, and is a common method for single-piece and small-batch production.
2. The horizontal grinding method of the cylindrical grinder: when the horizontal grinding method is used to grind the outer circle, the width of the grinding wheel is larger than the grinding width of the workpiece, and the workpiece does not need to make longitudinal (workpiece axial) feed motion, and the grinding wheel continues at a slow speed Horizontally or intermittently along the horizontal feed movement to realize the radial feed of the workpiece until the grinding reaches the size requirement. Its characteristics are: give full play to the cutting ability of the grinding wheel, high grinding efficiency, and also suitable for forming grinding. However, the large contact area between the grinding wheel and the workpiece during the grinding process increases the grinding force and the workpiece is prone to deformation and burns. In addition, the shape error of the grinding wheel directly affects the geometric accuracy of the workpiece, the grinding accuracy is low, and the surface roughness value is large. Therefore, a high-power, high-rigidity grinder must be used, and sufficient cutting fluid must be given to achieve the purpose of cooling while grinding. The use of the horizontal grinding method requires the rigidity of the process system to be good, and the workpiece should be short rather than long. This kind of grinding method is usually used for the fine grinding process of the short stepped shaft journal.
3. Deep grinding method of cylindrical grinder: The deep grinding method is a relatively advanced method, with high productivity, and the grinding allowance is generally 0.1~0.35mm. In this way, the entire margin can be ground in one pass. When grinding, the feed rate is small, generally the longitudinal feed rate is 1~2mm/r, which is about 15% of the "longitudinal grinding method", and the processing time is about 30-75% of the longitudinal grinding method.