Study On The Brazed Diamond Bit Experiment And Its Demoulding Design

After years of development, the brazed diamond bit has a apparent advantagecompared with the traditional diamond bit, such as simple structure, high strength,wear resistance, etc. These advantages make it have a more broad application space.However, the monolayer brazed diamond bit will failure after its diamond grits wearout, still cannot meet the need for longer life in geological exploration in our country.The multi-layer brazing diamond bit have more sustainable high cutting performancebecause of its self sharpening. Therefore, the multi-layer brazing diamond bit becomethe research hotspot in recent years. But the study on multi-layer brazed diamond bitis still at the laboratory stage. There are still many problems need to be solved toachieve its industrialization.In order to further improve its theoretical study and accelerate its industrialdevelopment, this paper include a series of works focus on the brazed diamond bit.The main contents are as follows:Firstly, designed two kinds of diamond bits with different processes to do wearexperiment. The experimental results proved that the tight adhesion of the metalmatrix to the diamond grits of the high temperature brazing diamond bit.Secondly, by analyzing the brazing process, a set of more intuitive formulas forthe designing of mould sizes are built. At the same time, a method to prevent the burstof mold is put forward.Again, the thermal elastic mechanics model is established to evaluation thethermal stress in brazing process. And the effect of the bit parameters and brazingprocess parameters on the stresses is analyzed.Finally, this paper designed a practical demoulding device used to cooling andreleasing the module for brazed diamond bit. This device improved the efficiency andreduce the intensity of the demould work.