Papers by Author: Zhong Ping Luo

Abstract: As a harmful impurity, Pyrophyllite must be remove in synthetic diamond purification process. It commonly use chemical method. A trial research is made on the removing of pyrophyllite impurity in synthetic diamond by physical method. As a result, after synthetic diamond materials containing pyrophyllite are selectively interground in the ball grinding machine, the pyrophyllite is effectively broken and removed from the coarse – medium grade diamond only by physical method, but diamond quality is not affected.

Abstract: This paper introduces the mechanical construction, operation principle, performance characteristics and the using result of physical impurities removing and purification technology of the kneading mixer, which is specially developed and particularly suitable for disintegrating and refining of synthetic diamond electrolysis residue. In order to avoid the slipping of materials in the tank and impacting the effect, non-slip kneading bar is especially equipped in the tank; the main shaft of helical mixing blade is driven by motor drive variable-speed system (speed control system), the mechanical strength is adjustable; running cycle is automatically controlled and adjustable, and the impact of human factors is excluded. Industrial tests and production applications show that the design of the machine achieves the desired results.

Abstract: This paper studies a new mill, which is developed particularly for the laboratory scale, with respect to the problems of low efficiency and bad adaptability of mills commonly used in laboratories. The paper briefly introduces the machinery construction, working principle, performance characteristics and grinding test methods. The main shaft of the mill is driven to rotate by the motor drive variable-speed system (speed control system), it could be equipped with cylinders of different volumes, the working speed and grinding intensity are adjustable; running cycle time is automatically controlled and adjustable, which eliminate the adverse effects caused by manual control errors. The results show that this machine could change the dosage scale of test materials in a large range, facilitate the grinding materials tests of different ores and different scales, and greatly improve the test efficiency and equipment’s adaptability.

Abstract: It is stated that Diamond saw blades requires high embedding strength of the diamond, while diamond drill bits do not. It is necessary to improve the embedding strength of diamond in diamond saw blades, rather than in the diamond drilling bits. It is recommended to count the number of diamond particles on the matrix surface and get the embedding strength of diamond by calculation. Another recommendation is to use the compound powder of cobalt and tungsten carbide for pelletizing in order to improve the embedding strength of diamond and lower the cost of matrix. There are people studying how to raise embedding strength of diamond, for both diamond saw blades and diamond drilling bit. However, the requirements for embedding strength of diamond saw blades and diamond drilling bit are different. The following parts include the analysis for this problem.

Abstract: The following conclusion is drawn from detailed mechanical analysis of Diamond Saw Blade,The load on diamond is not significant in cutting. However, at the moment the blade starts in its working state, the impact on rock has significant destructiveness on diamonds. Higher linear velocity of the blade, higher rock hardness and higher feeding speed all contribute in greater impact force on the diamond from the rock. And it is also stated that the unstable quality of diamond saw blade is closely related to the selection of diamond without following the TT1 test result. When designing the diamond saw blade, the saw cutting performance of the rock should be taken into consideration, as well as the necessary analysis of the force on the blade.There are three forces exerted on the saw blade: ①vertical downward pressure;②horizontal feeding thrust;③tangential cutting force of the saw. They are discussed separately in the following.

Abstract: In this paper, static-pressure strength, toughness index (TI) and thermal-toughness index (TTI) of each sample have been analyzed on the basis of the experimental studies on the magnetic separation and heavy liquid separation of diamond abrasives. The results show that the magnetism of synthetic diamond abrasives has an obvious influence on their mechanical performances. With the increase of magnetism, synthetic diamond abrasive particles becomes darker and darker in appearance color, and have more bubbles, impurities and defects inside the particles, furthermore, their surface fineness observed under the microscope will be found worse. While, the static-pressure strength, the TI under the normal temperature and TTI all become lower and lower. But the influence on the static-pressure strength and the TI is smaller, however the influence on TTI is the greater. The specific gravity of synthetic diamond abrasives has little influence on their mechanical performances.

Abstract: In an abrasive tool the abrasive is the main part undertaking grinding work, thus, the grinding effects mainly depend on the types and properties of the abrasive. The strength and fracture property of the abrasive grain in a synthetic diamond abrasive tool have a direct influence on the operational performance of the tool. Generally, it is expected that the strength and protrusion height of the grain are as same as possible. The strength and fragmenting property of the abrasive grain hinge on its crystal shape and regularity and completeness, internal vice, impurity content and impurity distribution pattern. The abrasive grains must be sorted and classified to make their grain sizes and their properties consistent with each and all. In this paper, the author discusses the basic properties and related performances of synthetic diamond abrasives. Elementary discussion is made separately on improving the vibration sorting, introducing the magnetic separation, applying the heavy liquid separation, exploring the floatation technology and using the selective fragmentation principle. In addition, here are presented the basic methods for precise sorting of synthetic diamond abrasives and their general principles. Practices have proved these methods effective and feasible.