Thermal Dynamics Simulation Of Brazed Diamond Bit In Cooling Process

Compared with conventional electroplated diamond bit, brazed diamond bitshows great superiority that perform in large gripping force of diamond and matrixcombination, high diamond exposure, fast cutting speed, large cutting space and so on.Diamond of conventional electroplated diamond bit easily works off in the process ofactual use due to small gripping force of diamond and matrix combination. It resultsin failure of the bit. In order to improve drilling efficiency and the life of bit to meetexploration of the terrain area in our country, manufacturing process of brazeddiamond bit and bonding mechanism of diamond and matrix have more and moreattention.In this paper, brazed diamond bit is studied. It analyzes and summarizes theknowledge of thermal dynamics of manufacturing and cooling process. Base on thesetheoretical studies, the model of brazed diamond bit and graphite mold is built inelement simulation software ANSYS. Do numerical simulation about the coolingprocess of the entire high temperature model for brazed diamond bit.In the view of the phenomenon that brazed diamond bit appears tiny crack in theprocess of actual production, this paper do numerical simulation work about bit’sthermal field and stress field in cooling process by the finite element softwareANSYS, For thermal field, it analyzes cooling fast and slow situation of brazeddiamond bit and graphite mold. It obtain the time that the entire cooling processrequired. For stress field, it concludes that the stress values in each part of entitymodel at different time points, further analyzes the area that produces maximum stress,which is possible location where tiny crack or potential crack in brazed diamond bitappear.In addition, when the entire solid model has been cooled, we need to removebrazed diamond bit from graphite mold, the simulation results of stress field isobtained by using finite element software ANSYS, from that we can view andanalysis the ejection force which brazed diamond bit separates from the graphite mold needed, then compare the simulation experiment of ejection force to the ejection forceobtained by theoretical calculation, thus, verified the correctness of the numericalsimulation of brazed diamond bit manufacturing and cooling process.