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Bearing Grinding: Analysis of Successful Cases of Dressing Grinding Wheels

by:JNSN     2021-10-26

 The key factors that can maximize the grinding performance of the grinding wheel are good shaping and sharpening (commonly known as dressing) tools and skilled dressing skills. In fact, an operator with high-quality dressing tools and proficiency in dressing grinding wheel skills can always keep the grinding wheel with high grinding performance. Instead of just relying on the purchase of so-called good grinding wheels. This is very important because the workshop cannot be equipped with special grinding wheels according to the situation of each person's operation.

  sharpening is a process of sharpening the abrasive grains of super-hard abrasive wheels. In this process, it is necessary to remove the bond between the abrasive grains and the blunt grinding wheel abrasive grains, so that the grinding wheel abrasive grains with strong grinding performance protrude beyond the bond to form a sharp cutting edge. Sharpening must also remove tiny materials from the pores on the surface of the grinding wheel to prevent the increase of the grinding force acting on the grinding wheel. The increase of the grinding force on the grinding wheel will cause vibration and cause surface burns of the parts.

   Without proper sharpening, even the best grinding wheel cannot obtain the high quality and dimensional consistency of the machined parts. In fact, when you invest in high-quality grinding wheels, in order to obtain high grinding performance, it is very important to dress them well.

   shaping can be said to be part of the preparation of the grinding wheel, which is carried out at the same time as the sharpening of the ordinary grinding wheel. For superabrasive grinding wheels, the two processes are carried out separately. First, the grinding wheel is reshaped. In grinding with super-abrasive grinding wheels, shaping is carried out using shaping tools or rollers. Shaping often uses a dressing rod of ceramic bond. After shaping is completed, the grinding wheel is sharpened.

   Before the dressing of the grinding wheel includes shaping and sharpening, it is important to ensure that the spindle bearing is at a certain temperature (such as the usual grinding wheel grinding state). In this way, damage to the geometry of the parts and abnormal wear of the grinding wheel and dressing tools can be avoided. The tools used for dressing must be handled carefully, because they are generally made of hard, wear-resistant but very brittle diamond material, and are very sensitive to small cracks and breakage caused by slight collisions and force.

  Because the diamond shaper itself is a tool, it needs to be very sharp. Using a dull dressing tool to dress the surface of the grinding wheel will make the grinding wheel dull. In order to maintain a high-quality and sharp diamond dressing tool, it is necessary to rotate a single-point or tapered dressing tool in 1/8 circle at regular intervals. The number of rotations can be determined according to the dressing situation. According to experience, at least one rotation per day. For chisel heads and shaped dressing tools, they generally need to be rotated 180° once before they are dulled.

   Most cylindrical grinders place the parts and the grinding wheel on a horizontal line. The highest point of the outer circle of the part and the highest point of the outer circle of the grinding wheel is called the part/grinding wheel contact point. The diamond dressing tool should be as close as possible to the part/grinding wheel contact point to dress the grinding wheel. For the grinding wheel for internal grinders, it is more important to dress the diamond dressing tool close to the highest point of the outer circle of the grinding wheel (that is, the part/grinding wheel contact point during hole grinding).

   adopt a small amount of trimming

   in order to reduce the trimming time, it seems that there is always a temptation to choose a larger trimming depth. This is an extremely wrong idea. The most suitable dressing depth must be selected to dress the grinding wheel. Choosing a too large dressing depth will produce high cutting temperature, reduce the service life of the dresser, and also remove the useful grinding wheel layer. The end result is that both the dresser and the grinding wheel are damaged, which is counterproductive.

   The best dressing amount is to restore the geometry of the grinding wheel after several times of dressing, and it can just produce a good grinding edge as a criterion.

  Using a single-point dressing tool, it should contact the diameter direction of the grinding wheel with an inclination angle of the axis line of 10-15o. This will cause the single-point dressing tool to have a sharpening effect when it rotates regularly. A dressing tool that touches at multiple points does not need to be tilted at this angle. Instead, use the entire end face of the dressing tool to contact the surface of the grinding wheel.

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