In the production of worm gears, grinding is a very important process. In addition to processing equipment and processing technology, the selection of grinding wheels is also an extremely important part. For worm gear grinding, worm grinding wheels are widely used because they can effectively improve dimensional accuracy, surface quality and stability, as well as high efficiency compared to ordinary grinding wheels. The scope of use includes straight worms, spiral worms, arc worms, etc., and are also widely used in various gear grinding, such as cylindrical gears, bevel gears, planetary gears, etc.
Worm grinding wheels are mainly based on common abrasives such as silicon carbide and SG, and are cut by contact between abrasive particles and materials. Grinding heat will be generated during the grinding process, causing the surface material to melt and vaporize. The heat dissipation performance of the grinding wheel will have a direct impact on the surface quality of the material. The most direct manifestation is the burn marks on the surface of the material, or the unstable cutting marks will cause scratches. In addition, the hardness, chip removal performance, and self-sharpening of the grinding wheel will also be important influencing factors. Therefore, choosing a suitable grinding wheel for grinding is also an important factor in improving efficiency and quality.
In order to ensure the grinding efficiency and accuracy of the worm grinding wheel, the dressing of the grinding wheel is also an important factor. There are mainly the following dressing methods:
●Regular dressing: Set a fixed time interval to dress the grinding wheel, such as dressing once after grinding a certain number of workpieces or dressing once after continuous work for a certain period of time. This method can repair the surface wear of the grinding wheel in time, remove the passivated abrasive, maintain the sharpness and dimensional accuracy of the grinding wheel, and improve the grinding efficiency and grinding accuracy.
●Adjustment during grinding: This method is to dress by adjusting the position of the worm grinding wheel against the workpiece, mainly for the change of the surface shape of the grinding wheel. During the grinding process, the eccentricity of the grinding wheel spindle is adjusted to consciously accelerate the contact surface loss and change the shape of the grinding wheel to make it conform to the required gear shape. This method can shape the grinding wheel without stopping grinding and improve production efficiency.
●Common problems and solutions: During the grinding wheel dressing process, some common problems may be encountered, such as uneven wear on the grinding wheel surface and cracks on the grinding wheel. In response to these problems, corresponding treatment methods need to be taken, such as replacing the grinding wheel, adjusting the grinding wheel speed, etc., to ensure the normal use of the worm grinding wheel.
●Selection of dressing tools: diamond dressing pen, diamond roller, etc.
