Views: 224 Author: zhongle Publish Time: 2023-10-24 Origin: Site
The state of the grinding wheel during the grinding process has a direct impact on the grinding result. The state of the grinding wheel includes changes in cutting force and grinding wheel shape. These modifications will have an impact on the yield and reproducibility of the ground product.
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1. Passivation occurs when the edges and corners of abrasive grains are gradually rounded during the grinding and extrusion process. At this time, the grinding wheel's self-sharpening ability does not play a role in time, which reduces the cutting force and renders the grinding function ineffective.
2. Debris will be generated during the grinding process, especially if the material is viscous. If the grinding wheel's pores are too small or the porosity is too low, debris will easily fill the pores and cause blockage. As a result, the grinding wheel loses cutting force and becomes a non-serrated plane.
Wear and tear will occur while using the grinding wheel. Such loss will result in the gradual loss of the grinding wheel's roundness and the unevenness of the grinding surface. This situation will result in issues such as grinding deflection and decreased grinding efficiency.
The grinding wheel must be trimmed in these unstable states to restore the cutting force or true roundness of the grinding wheel. However, because the grinding wheel rotates at such a high speed during processing, it is frequently impossible to see with the naked eye whether the grinding wheel has lost its cutting force or is uneven. When the cutting force is lost, however, many grinding phenomena occur. If these phenomena occur, it is possible to estimate whether the grinding wheel requires dressing.
Inadequate cutting force caused by passivation and clogging, as well as unevenness caused by wear, will be directly reflected in the grinding result; therefore, if any of the following conditions occur during grinding, it is time to repair the grinding wheel.
If the dressing speed is increased, the serrated part will be thicker, resulting in a thicker surface of the grinding wheel and a rougher grinding surface, but the cutting force will be greater.
The dressing speed is slower, and the sawtooth shape of the grinding wheel surface is smoother, implying that the grinding wheel surface is smoother, the grinding surface is finer, and the cutting force is less.
The grinding wheel's cutting surface is more like each abrasive is a cutting edge. To perform the grinding action, use this as the cutting edge. When the grinding wheel becomes blunted, we must repair the abrasive's sharp edge. In general, the faster, the thicker the shape, the better the cutting force.
Dressing too quickly can also cause complications. The dressing process is quick, and each jump is long. Although the abrasive is sharpened, the abrasive may be skipped for dressing because the moving speed is too fast. As a result, not every grit is dressed, resulting in poor cutting force. More importantly, the sharpness retention of the grinding wheel will not be sufficient because only one-third of the abrasive is likely to be trimmed, and only this part of the abrasive has cutting force, which will be blunted soon. As a result, while a faster repair provides more cutting force, it is also important to keep in mind that a lot of abrasives may be missed if it is too fast. As a result, after rough repairing, there may be a good cutting force at first, but it will be lost quickly, which may be caused by the effect of too fast dressing speed.
On the contrary, if the dressing speed is too slow, even if each abrasive is dressed evenly, there may be no cutting force at all, and the entire abrasive may be pulled out due to too much resistance, and the abrasive will fall off. If the speed is too high, the grinding wheel will frequently lose sand.
As a result, the dressing speed has a range that can be adjusted based on the abrasive, the size of the abrasive, the speed of the grinding wheel, and so on. If the cutting force is insufficient, the maintenance is poor, or the sand is lost, it is most likely due to too fast or too slow abrasive repair.