Judging whether the abrasive belt has expired is mainly based on the wear situation. When the end of the wear is reached, the service life of the abrasive belt ends, indicating that a new belt is needed. Whether the wear is in the final stage mainly reflects:
1) When the material removal rate or grinding efficiency drops to the specified resin, it can be considered that for grinding (given the amount of grinding and other conditions), the service life of the sanding belt has expired.
2) Grinding force. When the grinding force exceeds a certain value during the grinding process, it can also be used as a sign of the service life end of the sanding belt.
3) Grinding temperature. During the grinding process, if the grinding temperature exceeds the specified standard, the service life of abrasive belt can be considered to be expired. In practical applications, the most direct way to determine whether the temperature higher is to observe whether the surface of the workpiece has burned.
The above judgment is only from the aspect of grinding performance. The production cost is a very important factor, because replacing abrasive belt too early means consumes more, too late, the grinding efficiency is too low, the labor cost increases, and the cost increases. Therefore, to determine whether the sand belt should be replaced, the two must be combined, and the ultimate goal is to minimize the cost of a single piece. Statistics show that by analyzing the average cost of a single product, when abrasive belt grinding is performed at the highest productivity, although the belt life will be shortened as a result, it is more effective than the longest life of each belt. Compared with low efficiency, it is more economical. For abrasive belts with higher initial grinding efficiency, the most economical life may only be 1/3 of the life when grinding with low efficiency. Of course, changing the blunt in turn and using it for finer processing will also make processing more economical