Tungsten Carbide DTH Drill Structure

With the development of blasting and mining technology, tungsten carbide DTH has high hardness, high strength and excellent wear and corrosion resistance, which has been widely used in the related fields. But the conditions has become more and more complex and there are many uncontrollability and unpredictability, tungsten carbide DTH drill easily appears different kinds of damages and greatly has an effect on the service life of the drill. Through long-term experiments and practice, the researchers found that factors affecting performance and service life of the drill bit working environment, mode of operation, the pressure and the geological structure are loaded in one of the important factors as well as their own material and carbide button drill performance, structure of the drill is also the important factor.

In order to get a more scientific and reasonable design of DTH drilling, we need to know the rock breaking mechanism of carbide DTH drilling. It mainly uses the stress shock wave produced by the impactor to high-frequency impact the rock surface continuously. Under the impact, it will produce radial cracks and resulting in the rotation of the drill pipe squeeze under the crushing action directly to the rock removed. Drilling is the result of the drilling bit high impact and continuous scraping. At the same time, under the action of high-pressure air, the cuttings are crushed continually blow hole outside, so as to achieve the purpose of drilling. Tungsten carbide DTH drill is composed of steel base, shank and participation nylon tube, tungsten carbide buttons and debris removing system. Steel base plays an important role in delivering stress shock wave and torque, maintaining and fixing the buttons. While tungsten carbide buttons are charged with the high frequency stress waves from the impactor and passed directly to the rock face for cutting process. In addition, it should be noticed that the relationship among the various elements during the process, especially the clearance fit.

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