Single-point loading and center loading of metallographic polishing

The advantage of single-point loading of the metallographic grinder and polisher is that the number of samples is free and flexible, as long as it is within the maximum number of holes, and the sample is easy to take and put, especially suitable for regular observation of the effect in the later stage of grinding and polishing.

The disadvantage is that the sample rotates and moves in a small range in the holder. The rotation strictly controls the grinding trajectory of the sample, and the small range of movement easily leads to rounded corners.

The advantage of center loading of the metallographic grinder and polisher is that the sample is locked in the holder, so the grinding trajectory of the sample can be accurately controlled, and the reproducibility of sample preparation can be improved.

Especially for the rough grinding and fine grinding stages, the grinding rate is very large, and the grinding effect of the sample is controlled.

In addition, due to the center loading, the grinding effect of samples of different materials is the same. Of course, the disadvantage is also the limitation of the number of samples. Because it is center loading, the number of samples must be symmetrical in the center to ensure the balance in the hand.

For example, the six-station holder can clamp 2, 3, 4, and 6 samples. If it is insufficient, it must be supplemented with alternative samples. In addition, center loading does not support the observation of samples taken out in the middle, and it cannot be guaranteed that each sample is on the same grinding reference surface after reinstalling it.

To sum up, single-point loading and center loading have their own advantages and disadvantages.

The general optimization method is that for rough grinding, fine grinding and even rough polishing, it is best to use the center loading mode, and switch to the single-point loading mode in the polishing stage, so that the polishing effect can be checked at any time.

Therefore, it is best for the grinding and polishing machine to have the functions of supporting both single-point loading and center loading.