To determine whether the particle size of the grinding piece meets the requirements, it can be considered from the following aspects:
** First, observe the surface roughness **
1. Use the roughness measuring instrument to directly measure the surface roughness value after grinding. If the measurement results meet the desired roughness requirements, then the current abrasive particle size may be appropriate.
2. Observe the surface with the naked eye or a magnifying glass. If the surface looks smooth and there are no obvious scratches, bumps or coarse scratches, it usually indicates that the particle size is chosen properly.
** Two, check grinding marks **
1. If the grinding marks left on the surface after grinding are uniform, fine, and in the same direction, it indicates that the particle size of the grinding sheet matches the grinding process.
2. On the contrary, if the marks are thick, uneven or there is staggered confusion, it may be that the particle size is too coarse or the grinding method is not correct.
** Three, compare the standard template **
1. Prepare standard templates with known roughness and accuracy. The grinding workpiece is compared with the standard template, and the surface quality is close to or reaches the level of the template through intuitive visual comparison.
2. If the surface of the workpiece is equivalent to the standard template in glossiness, flatness, etc., then the particle size of the grinding piece may meet the requirements.
Four, consider the purpose of processing **
1. If it is to remove more material allowance, and the residual removal after grinding meets the expectation, and the subsequent processing can proceed smoothly, then the current particle size is appropriate.
2. If the final product meets the design or process requirements in order to obtain a specific accuracy or finish, it also indicates that the particle size has been selected correctly.
** 5. Perform functional tests **
1. For some functional parts, such as sealing surfaces, mating surfaces, etc., corresponding functional tests can be carried out. If the part performs well in the test and meets the functional requirements such as sealing and fitting, then the particle size of the grinding piece is generally appropriate.
For example, when grinding a metal part for an optical instrument, the surface roughness measured by the roughness measuring instrument reaches the requirement of less than 0.1 micron, while observing the surface with a magnifying glass has no obvious coarse marks, and the surface quality is comparable to that of the standard high-precision optical part template, then it can be judged that the particle size of the grinding piece used meets the requirements.
For example, when grinding the sealing surface of a mechanical seal, the sealing performance test is carried out after grinding, and the sealing effect is good, and there is no leakage phenomenon, which also shows that the particle size selection of the grinding sheet meets the processing needs.