Wide wheel grinding is also a kind of high efficiency grinding, which increases the grinding efficiency by increasing the grinding width. In the outer circle and surface grinding, the cutting grinding method is generally used, but in the centerless grinding, the cutting grinding method is also used. Wide grinding wheel grinding workpiece accuracy up to H6, surface roughness up to 0.63 micron. So, what are the grinding techniques of the wide wheel?

一、Characteristics of wide grinding wheel

1. The grinding wheel can be ground to form the surface after shaping and dressing, which can ensure the forming accuracy of the parts; At the same time, the cutting grinding is more efficient than longitudinal reciprocating grinding.

2. because the grinding width is large, so the grinding force, grinding power, grinding heat is also more, should be strengthened cooling.

3. Because of the wide width of grinding wheel, the spindle cantilever is extended for a long time.

4. It is required that the hardness of the grinding wheel should be uniform not only in the circumferential direction but also in the axial direction, otherwise it will cause uneven wear of the grinding wheel and affect the precision and surface quality of the machining workpiece.

Because of the above grinding characteristics, wide wheel grinding is suitable for mass grinding of workpiece, such as spline shaft, motor shaft, driving shaft of automobile tractor, twist drill, etc.

Wide grinding wheel on production line can reduce the number of grinding tables and floor space.

二、wide grinding wheel grinding equipment requirements

1. Wide grinding wheel grinding requirements for machine tools

(1) Grinding wheel spindle system has better rigidity, and spindle rotation accuracy is higher. Due to the large grinding force of wide grinding wheel and the heavy weight of grinding wheel, the spindle system is required to be rigid to avoid deformation of the spindle. In order to make the spindle have better rigidity, the extension of the spindle cantilever should be as short as possible, and choose a reasonable bearing structure. Using static bearing can obtain better rigidity and turning precision and easy to start.

(2) The head frame and tail frame shall be sufficiently rigid. The headstock spindle and tailstock sleeve should be suspended as short as possible so as to choose the center with larger diameter and shorter suspension. In order to make the rigidity of the head bracket and tail bracket equal, different size of the center can be selected, and make the pressure spring of the tail bracket sleeve have enough compression force.

(3) Grinding wheel frame guide shall be rigid enough. Proper guide structure should be selected, suitably lengthen the guide of the grinding wheel frame and increase the span of the guide of the grinding wheel frame, while improving the manufacturing precision of the guide.

(4) Rationally select the power of the grinding wheel drive motor. Wide wheel has large grinding force and is mainly used in mass production. The power of grinding wheel drive motor should be kept reasonable margin.

2. Requirements for wide grinding wheel

The selection principle of ordinary grinding wheel is basically applicable to wide grinding wheel. In addition, uniform wear on the width of the wheel should be taken into account, so the wide wheel grinding should focus on the selection of the wheel with uniform wear and shape accuracy.

Wide grinding wheel should be made of abrasive with good toughness and good shape retention, such as chrome corundum, brown corundum, etc. Because of the heavy grinding load, the grain size of F46 is often chosen for rough grinding, and F60 for fine grinding. The hardness of wide grinding wheel is very important. The workpiece is easy to burn and the metal cutting rate is low if the hardness is too high. If it is too soft, the shape will not hold well, and the consumption of grinding wheel will increase. According to experience, it is usually chosen within the range of J – L.