1.The longitudinal grinding method When the longitudina […]
1.The longitudinal grinding method
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 motion, it also reciprocates longitudinally with the worktable to realize the axial feed of the workpiece. At the end of each single stroke or each reciprocating stroke, the grinding wheel performs periodic lateral movement to realize the feed along the radial direction of the workpiece, thereby gradually grinding away all the remaining grinding allowance in the radial direction of the workpiece. After grinding to size, a smooth grinding process without lateral feed is carried out until the spark disappears. Because the longitudinal grinding method has a small amount of 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.Horizontal grinding method
When using the horizontal grinding method 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 perform longitudinal (workpiece axial) feed motion. The grinding wheel is continuously or intermittently fed at a slow speed. Movement to realize the radial feed fr 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
The deep grinding method is a relatively advanced method with high productivity. The grinding allowance is generally 0.1~0.35mm. This method can be used to grind the entire allowance in one pass. When grinding, the feed rate is small. Generally, the longitudinal feed rate is 1~2 mm/r, which is about 15% of the longitudinal grinding method, and the processing time is about 30% to 30% of the longitudinal grinding method. Seventy-five percent.
4.Mixed grinding method
On the cylindrical grinder, the end face of the grinding wheel can be used to grind the shoulder and end plane of the workpiece. Before grinding starts, the end face of the grinding wheel should be slowly approached to the end face of the workpiece to be ground. During the grinding process, the axial feed of the workpiece should also be small. This is because the rigidity of the end face of the grinding wheel is very poor, and basically cannot bear a large axial force. The outer conical surface of the grinding wheel is used to grind the end face of the workpiece. At this time, the worktable should be pulled at a larger angle.