Abstract Synthetic diamond abrasives are synthesized under high temperature and high pressure conditions. The pressure and temperature conditions in the high pressure chamber are not completely consistent, and the diamonds grown are not the same, so their performance is also different. Studies have shown that the strength and crushing properties of diamond abrasive grains mainly depend on their crystal...
Synthetic diamond abrasives are synthesized under high temperature and high pressure conditions. The pressure and temperature conditions in the high pressure chamber are not completely consistent, and the diamonds grown are not the same, so their performance is also different. Studies have shown that the strength and fracture properties of diamond abrasive grains mainly depend on their crystal form and its regularity, internal defects and impurity content and distribution. The purpose of the classification and sorting is to mix the synthetic diamond abrasives with large difference in particle size and shape under high temperature and ultra-high pressure conditions, and to make them precise by particle size and crystal by means of screening and different sorting methods. The shape and the degree and integrity of the rules as well as the internal defects and impurity content and even the surface traits are strictly classified to achieve the goal of making their designated products more consistent and performance stable; to ensure the long-term stability of product quality and performance, try to Meet the various needs of different users.
The history of direct mass production of micron-sized diamonds by presses in China is not long. The conventional fine-grained diamonds (micron-scale) are obtained by synthesis after press, and the shape selection cannot be carried out by mechanical means. Traditionally, the sedimentation method is mainly used for shape selection. The method has a long time and a large area, and the precision of the produced diamond particles is difficult to meet the requirements of the industry standard, and the application range is limited. In addition, the diamond selection machine currently on the market is not ideal for selecting in a humid environment.
Let's first look at the relationship between the particle size range and the disk surface roughness.
| Diamond particle size range (mesh) | Modeling machine surface roughness |
| 16/18~100/120 | Coarse plate |
| 40/45~170/200 | Ordinary disk |
| 100/120~270/325 | Thin plate |
| 270/325~325/400 | Micrometer selection machine |
As early as January of this year, the fine-grained diamond shaper independently developed by Guangxi Liuzhou Huadi Prospecting Machinery Factory realized the precise shape selection of 400-800 mesh (38-18 μm) micron-sized diamond crystals, successfully solved the problem of fine-grained diamond sorting. It has filled the gaps in such equipment at home and abroad and reached the international advanced level.
Recently, the factory has heard the news and successfully developed the first fully heated temperature-controlled digital diamond selection machine in China. The new model can reduce the influence of water molecules in the air on the shape selection effect of the diamond, realize the integration and visual operation of the temperature digital display screen and the control device, and effectively improve the diamond shape selection quality and work efficiency.
In addition, the R&D personnel of the plant passed a number of tests and finally selected a heating device using a silica gel heating film to design a block heating mode. After testing, as the temperature of the heating device increases above 33 ° C or the relative humidity decreases below 40% RH, the influence of external factors such as adhesion caused by the capillary force of water molecules in the air on the shape selection effect can be effectively reduced. The quality of diamond selection is improved, and the test data meets the technical requirements set by the development team.
Appendix: People's Republic of China Machinery Industry Standard (Diamond Selector) http://down.bzwxw.com/01/JB_T%208374-1996.pdf
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