Abstract
Abstractâ??The Collimated Abrasive Water Jet(CAWJ) Cutting System is a compact system applicable in the workshop and on-site as well. The device allows machining between steam turbine discs with a gap space down to 120mm. The CAWJ Cutting System is supposed to overcome the main disadvantages of the conventional machine tool methods such as: long process times, lack of mobility of the drilling tools. For increasing the working efficiency and improving the cutting quality in material, the characteristics of the Cutting experiment and operating principle of a rig of CAWJ are discussed. Rock was cut for the experiment. The theory of abrasive accelerated in a long collimating pipe and reflect of cutting hard rock in various parameters of operating are analyzed. Theoretic and experimental results show that the CAWJ retains its ability basically when the length of the collimating pipe is in the range of 0.6m~2.8m. There is an optimum relationship during the length and diameter of the collimating pipe; abrasive feed rate and size. The research will lead to development of the hard rock cutting equipment using CAWJ.
Highlights
The tunneling systems of CAWJ have been put forward since later 80’s
The new tunneling system has a lot of advantages, such as a lower tunneling cost and higher tunneling speed, a good rock laneway molding and supporting performance of rock wall, and a less embrasure needed
The abrasive speed increases to the maximum rapidly and reduces gradually in thinner collimating pipes and but the abrasive particles accelerate at all times in thicker collimating pipes because the thinner the collimating pipes’ diameter is, the greater the flow drag losses of fluids mixture are
Summary
The tunneling systems of CAWJ have been put forward since later 80’s. There are three steps for tunneling, first cutting deep contour slot using collimated abrasive jet cutter, drilling deep holes using collimated drills, and last exploding. The new tunneling system has a lot of advantages, such as a lower tunneling cost and higher tunneling speed, a good rock laneway molding and supporting performance of rock wall, and a less embrasure needed. CAWJ can retain its cutting power for distances of over 3 meter by collimating the abrasive jet in a pipe. That collimated abrasive jets undoubtedly have further applications in mining, but such applications await an improved investigation of the theory and experiment of collimated abrasive jets
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