Analysis of the application of granulation process in powder metallurgy and diamond tools
July 18, 2022
The granulation process has been applied and developed in the processing of ancient Chinese patent medicines in China. It is now widely used in the pharmaceutical industry, in the preparation of powder metallurgy materials and their alloys, in the metallurgy, ceramics and fertilizer industries. In recent years, in the production of diamond tools, in order to improve the production efficiency and quality of the cold head, it is possible to automate the production, and the granulation process has been developed and applied. The granulation process has been applied and developed in the powder metallurgy and diamond tool industry, mainly due to the following advantages: The fluidity of the powder is improved and improved. After powder granulation, the particle diameter is larger than the original powder particle size, and the number of particles that can be contacted around each particle is reduced, so that the adhesion, cohesiveness and mutual friction are greatly reduced, thereby improving and improving the particle material. fluidity. 2. Reduce the segregation and aggregation of powder and diamond, and distribute more evenly, improving the performance of the product. In the granulation process, the powder, the diamond and the binder are uniformly mixed in advance, and then the solvent is wetted, mixed and granulated, and each diamond is wrapped by the sub-powder, and then cold-formed and sintered, thereby preventing the segregation of the powder and the diamond. Aggregation, which in turn improves the sintering properties, uniformity and product stability of the product. 3. The size and weight accuracy of the product are improved. Due to the improved fluidity of the mixed powder, the filling and cold pressing of the powder product are more uniform, and the geometrical size and weight accuracy of the cold pressed product are improved. This is better for pressing the profiled inserts of shaped products, sandwich cutters and laser welded saw blades. 4. Reduce the loss of the cold press mold. Due to the good fluidity of the powder, the diamond is wrapped by the powder and the distribution is more uniform, so the loss of the cold-pressed mold is reduced, and the life of the mold is increased by more than 50%. 5. The efficiency and economy of the cold pressing process are improved, and conditions for automatic production of cold pressure are created. Due to the improvement of the fluidity of the powder and the improvement of the life of the mold, the efficiency of the ordinary weighing automatic cold press is higher, which makes the adoption of the volumetric automatic cold press possible. For example, KPV-160 of Germany's DrFritsch Company introduced by China's diamond tool industry, 32VPM volumetric cold press of a foreign company, according to the design of the cutter head, after the working parameters are input into the computer, the production is automatically carried out without personnel supervision. According to DrFritsch, after the granulation and volumetric cold press, the press time was reduced from 32S to 10S; the die life was increased from 12,000 to 25,000; the cold press cost was reduced from $0.35 to $0.11. 6. Reduce the harm of powder pollution to workers' bodies. After the granulation process, the fine powder is reduced, the particles are not easily broken, and it is convenient for storage and transportation, so that dust flying and pollution are greatly reduced.
