The Study On Wear Regularity, Design And Performance Test Of Diamond Bit And Diamond Saw

In china, diamond used in the products such as diamond bits and diamond saws are more than 60%. These diamond bits and saws, on the other hand, are low or middle-grade products; There is still a long way to go to produce high-grade products. One important reason leading poor products is lack of systematic theory to guide the procession of design, producing and application of the products. The aim of this research is to find the wear regularity of diamond bit and diamond saw, and carry on systematic research to the design, production and performance test technology of diamond bit and saw. One series of optimization study has made for the parameters design of diamond bit and saw, including diamond quality, diamond concentration, diamond size, matrix material performance, the technology of controlling temperature and pressure, as well as geometry shape. Focused on some products that have special request, great influence to trade development and high technology request, this research has proposed some optimization suggestions as follows:First, drilling experiments are made in uniform man-made rocks (ceramic tile), the wear regularity of diamond bit is analyzed from microcosm, conclusions are given as follows: (1) A mount of appeared diamond on the bit surface is changing periodically with bit footage; (2) Drilling speed is varying with the amount of appeared diamond on the bit surface, the more diamond appears, the higher drilling speed is.Otherwise, it is the same tendency; (3) Wearing speed of the bit is changing with drilling speed. The higher drilling speed is, the faster bit wearing happens, the same result has been approved in the opposite situation; (4) The quality of the diamond and the inlay intensity of the diamond bit could be measured by the percentage of amount of bit lip surface integrity, fell off, micro-fracture, the thick crack diamond quantity among the total quantity of the diamond.The second, diamond quality, diamond concentration, diamond size, matrix material, technology of controlling temperature and pressure and lip surface shape had been researched from both theoretical and practical side. One optimized design plan is suggested in the thesis. This study has made some pioneering works as follow: (1) The proportioning of diamond size which is designed by calculating the cutting in rock depth difference of diamond lip face is acquired; (2) The design plan of diamond concentration is submitted by comparing the pressure of rock unit area forcing by diamond with crack strength of rock; (3) The self-tartness diamond boring bit is researched successfully which depends on the drill machine self weight to force pressure, which is adapted to the modern hydropower engineering. The researching achievement can raise effectiveness for a given period time and life span of boring bit; (4) The method of using diamond grain manufacturing is obtained and it can make diamond surface layer wrapped up a layermaterial which could increase the bond retention of diamond.The third, in order to solve the problem of low life span of diamond boring bit in drilling reinforced concrete, the author has made the research from the theory and the actual two aspects to this kind of diamond boring bit. By calculating the depth of cutting in rock and the gap of diamond, the thesis has submitted a suggestion to increase the wearing capacity of matrix and diamond life span by using thick grain-high intensity and fine grain-low intensity diamond fixedly. The former is used- to break rock as primary wearing material and -the later to decrease the diamond gap, in order to prevent sand grain to enter the diamond gap to wash matrix to increase the wearing capacity of matrix and the life span of boring bit. This suggestion will ensure drilling efficiency and life span of boring bit and have achieved ideal practical result.The fourth, in the thesis, is one optimization plan of combinatorial diamond saws. After analyzed the difference of combinatorial diamond saws and single diamond saw, one conclusion has been obtained as follo...