New technology of diamond wire saw

1. Brazing technology

The impregnated diamond tool is a special composite material made by sintering diamond particles and metal powder. Diamond particles in the matrix - generally in a random state distribution, tool work with the matrix wear, so that layers of diamond particles continue to expose and cut as a micro-cutting edge cutting objects, their own continuous wear and tear fragmentation and shedding, in the form of a relay to work continuously, cycle to and fro until the end of consumption. The distribution of diamond impregnated with sintered beads in matrix is random, the interval between grits is uneven, and the matrix is mainly controlled by mechanical force. The value of diamond cutting edge is low, the cutting efficiency is low, the problem of self-sharpening of diamond cutting edge is difficult to solve, and the grinding effect of each diamond can not be brought into full play, resulting in raw materials. Waste. The principle of "brazing" Diamond Beads is that the active elements (such as Ti, Cr, W, etc.) can react with the surface of diamond and form a layer of carbide in the brazing process. Gold is combined. Domestic brazed beads are mainly made of nickel or titanium-based solders, and then sintered in vacuum or argon atmosphere. At present, domestic enterprises mainly produce single-layer diamond brazed beads, multi-layer diamond brazed beads need to be studied.



2. Diamond directional alignment technology

The diamond is arranged on the working lip of the tool according to certain regularity. The arrangement distance between diamond and diamond and the arrangement regularity are controllable to meet the cutting requirements of different cutting objects. The methods of realizing diamond orderly arrangement include template method, dispensing method and laser method. The newest practical method is to form regular holes in the cold pressing process of the matrix. The diameter of the holes is designed according to the coarsest grain size of the diamond coating. The diamond is formed by automatic cold pressing machine. Then the diamond is filled into the holes by special equipment. After cold pressing, the diamond is sintered by hot pressing. After diamond is arranged orderly on the working lip surface of bead string, its cutting efficiency and cutting life are greatly improved, and the utilization ratio of diamond is also greatly improved.

3. Integrated technology applications

In summary, the beads made by high temperature brazing and diamond orderly arrangement have incomparable advantages compared with the beads made by impregnated sintering and electroplating, especially in the application of small diameter bead string rope. Its main advantages are: 1) high diamond exposure, ordinary bead diamond cutting height is limited to 1/3 of the abrasive height, while brazed bead cutting height can reach 2/3, with 70%~80% of the diamond exposed height, greatly expanding the chip space, not easy to occur chip blockage and tool failure. (2) The cutting efficiency of brazed beads is 4 times higher than that of sintered beads, and its solid chemical metallurgy combination is suitable for high efficiency grinding. (3) The utilization rate of diamond is high, the amount of diamond used is reduced by half, the cost is reduced, and the sawing life is equivalent to the conventional bead string. The application of brazing technology in small diameter bead string can produce good results. If the matrix diameter of sintered bead string is reduced, the characteristics of multi-layer diamond will be lost. However, brazing technology can produce diamond string beads with superior performance and smaller specifications.