The service life of the abrasive sanding belt depends on the cutting performance of the abrasive cutting edge, which is mainly affected by the abrasive wear area of the abrasive belt. If the wear area ratio is n, it is the ratio of the flat surface area of the wear particle to the projection surface area of the wear particle in the sand belt plane.
The following measures can be taken to improve the service life of the sanding belt:
1) Reduce the initial wear of the sanding belt.
The initial wear of the abrasive belt is caused by the abrasive particle falling off or breaking. In order to reduce the initial wear, the new abrasive belt is pre-worn for a certain time by reducing the contact pressure, and then normal work is carried out. This method can also be called dressing, but it is different from the dressing of the grinding wheel.
2) Use grinding additives or grinding fluids to reduce the wear rate during the stable wear stage.
The main purpose of using grinding additives or grinding fluids is to reduce the friction between the abrasive particles and the workpiece, reduce the grinding heat, and thus achieve the effect of reducing the wear rate.
3) Increase the perimeter of the sand belt to reduce the utilization rate of the sanding belt.
The life of sand belt can be increased with the decrease of sand belt operation rate. If the conditions of the machine tool equipment permit, the circumference of the sand belt is appropriately increased, so that the sand belt can get better cooling and increase the total number of abrasive particles involved in grinding.
4) Appropriately increase the speed of the belt.
Properly increasing the speed of the belt can not only reduce the surface roughness, but also reduce the crushing wear of the abrasive particles and prolong the life.
5) Gradually increase the grinding pressure.
After the sand belt enters the normal cutting stage, gradually increasing the grinding pressure of the sand belt can strengthen the grinding process, increase the grinding grain cutting edge ratio pressing, make the grinding grain broken, produce a new cutting edge recovery cutting ability, that is, self-sharpening action, so as to extend the service life of the sand belt.
6) Improve the cutting performance of the sanding belt itself.
The abrasive with good toughness has strong crushing resistance, which can extend the service life. The cutting performance of the belt of classical plant sand is better than that of gravity plant sand. Reducing the thickness of the binder and the density of the binder in the sand can increase the space of the sand belt, improve the strength of the binder, and make the bonding more reliable. These measures can improve the grinding performance and prolong the service life of the sand belt to a certain extent.
The above measures are mainly aimed at reducing the main form of abrasive sanding belt wear (abrasion and crushing). For the two forms of adhesive cap and detachment, it can be solved by controlling and selecting the structural parameters of the abrasive belt such as the hardness of the tissue and the density of the planting sand. At the same time, a special coating can be applied to the surface of the abrasive belt. The above mentioned supercoating to solve the problem of adhesive cover wear of the belt or the use of grinding fluid.
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