Wide grinding wheel grinding is also a kind of efficient grinding, which increases the grinding width to improve the grinding efficiency. In cylindrical and surface grinding, the cut-in grinding method is generally used, and in centerless grinding, in addition to the cut-in grinding method, through grinding is also used. Wide grinding wheel grinding workpiece accuracy up to h6, surface roughness up to 0.63 microns. So, what are the processes for grinding wide grinding wheels?
First, the characteristics of wide grinding wheel
1. The forming surface of the grinding wheel can be ground after forming and dressing, which can ensure the forming accuracy of the parts; At the same time, because of the use of cut-in grinding, the efficiency is higher than that of longitudinal reciprocating grinding.
2. Due to the large grinding width, the grinding force and grinding power are large, and the heat generated during grinding is also much, and the cooling should be strengthened.
3, because the width of the grinding wheel is large, the main shaft cantilever is extended longer.
4, the hardness of the grinding wheel is not only uniform in the circular direction, but also uniform in the axial direction, otherwise it will cause uneven wear of the grinding wheel, affecting the accuracy and surface quality of the workpiece.
Due to the above grinding characteristics, the wide grinding wheel is suitable for the grinding of large quantities of workpieces, such as spline shafts, motor shafts, driving shafts of automobile tractors and twist drills.
The use of wide grinding wheels in the production line can reduce the number of grinding machines and footprint.
Second, wide grinding wheel grinding equipment requirements
1, wide grinding wheel grinding machine requirements
(1) The rigidity of the grinding wheel spindle system is better, and the spindle rotation accuracy is high. Due to the large grinding force of the wide grinding wheel and the large weight of the grinding wheel, the spindle system is required to be rigid to avoid deformation of the spindle. In order to make the main shaft have better rigidity, the extension of the main shaft cantilever should be as short as possible, and a reasonable bearing structure should be selected. The use of static bearing can obtain better rigidity and rotation accuracy and easy to start.
(2) The head frame and tail frame should be sufficiently rigid. The head frame spindle and tail frame sleeve should be suspended as short as possible, so that the center with larger diameter and shorter suspension can be selected. In order to make the rigidity of the head frame and the tail frame equal, different sizes of the center can be selected, and the pressure spring of the tail frame sleeve has enough pressing force.
(3) The guide rail of the grinding wheel frame should be rigid enough. The proper guide rail structure should be selected, the guide rail of the grinding wheel frame should be lengthened and the span of the guide rail of the grinding wheel frame should be increased, and the manufacturing accuracy of the guide rail should be improved.
(4) Reasonable choice of wheel drive motor power. The wide grinding wheel has large grinding force and is mostly used in mass production, and the power of the wheel driving motor should be left reasonable margin.
2, wide grinding wheel grinding wheel requirements
The selection principle of ordinary grinding wheel is basically applicable to wide grinding wheel. In addition, the uniform wear on the width of the grinding wheel should also be considered, so the wide grinding wheel should focus on choosing a grinding wheel with uniform wear and good shape accuracy.
Wide grinding wheel should choose good toughness, shape retention good abrasive, such as chrome corundum, brown corundum, etc.; Because of the large grinding load, F46 particle size is often used in rough grinding, and F60 particle size can be used in fine grinding. The choice of hardness of wide grinding wheel is very important, the workpiece with high hardness is easy to burn, and the metal removal rate is low; If it is too soft, the shape retention is not good and the consumption of the grinding wheel is increased. According to experience, it is mostly selected in the range of J-L
