空气锤钻头破岩热固耦合数值分析

Simulation Analysis of Thermal-solid Coupling of Air Hammer Bit for Breaking Rock

为研究钻头钻掘岩石过程中的温度变化规律,通过对钻头-岩石系统的生热传热分析,建立钻头与岩石的互作用模型,采用弹性滑移的罚摩擦公式,对钻进过程进行温度场数值计算分析。研究表明:钻齿温度主要集中在钻齿与岩石的接触区域,中心齿的线速度小于边齿,导致边齿热应力高于中心齿。钻齿中心部位切削温度最高可达170℃,温度沿着钻齿圆弧逐渐降低,岩石最高温度可达134℃。

In order to study the temperature variation of the rock drilling process,we analyzed the heat transfer between the bit and rock system and established an interaction model between them. With the formula of penalty friction for elastic slip,we also analyzed the drilling process by numerical calculation. The results show that the drill tooth temperature mainly concentrated in the contact area of tooth and rock drill,the line velocity of center tooth is less than the side tooth,which leads to thermal stress of the side tooth is higher. The cutting temperature is up to 170℃ in the center teeth,and it gradually decreased along the drill tooth arc. The highest temperature of rock up to 134℃ .