Judging whether the abrasive belt has expired is mainly based on its wear. When it enters the end of wear, the service life will end, indicating that it needs to be replaced. Whether the wear has entered the final stage is mainly reflected by the following parameters:
1) When the material removal rate or grinding efficiency drops to the specified resin, it can be considered that the service life of the abrasive belt has expired for this grinding (given grinding amount and other conditions).
2) Grinding force. When the grinding force exceeds a certain specified value during the grinding process, it can also be used as a sign of the expiration of the life of the abrasive belt.
3) Grinding temperature. During the grinding process, if the grinding temperature just exceeds the prescribed standard, the service life of the abrasive belt can also be considered to have expired. In practical applications, the most direct way to determine whether the temperature exceeds the standard is to observe whether the surface of the workpiece is burnt.
The above judgment is only from one aspect of grinding performance. In actual production, the production cost is also a very important factor, because replacing the belt too early means more tool consumption, too late, the grinding efficiency is too low, the labor cost increases, and the cost increases. Therefore, to determine whether the abrasive belt should be replaced, the two must be combined, and the ultimate goal is to minimize the single-piece cost.
The above judgment is only from one aspect of grinding performance. In actual production, the production cost is also a very important factor, because premature replacement also means increased tool consumption, too late, grinding efficiency is too low, labor costs increase, and costs increase. Therefore, to determine whether it should be replaced, the two must be combined, and the ultimate goal is to minimize the cost of a single piece. Statistics show that: through the analysis of the average cost of a single product, when grinding is carried out at the highest productivity, although the life of the abrasive belt will be shortened due to this, this is more than the used in order to obtain the longest service life of each abrasive belt. Compared with low efficiency, it is more economical. For abrasive belts with higher initial grinding efficiency, the most economical life maybe only 1/3 of the life when grinding at low efficiency. Of course, changing the blunt one by one and using it for finer processing will make the processing more economical, but this is another matter.
An easy way to decide when to replace the abrasive belt to obtain the lowest unit cost. The cost curve is obtained from the test results. The productivity curve represents the number of parts processed at different times.