冰层回转钻进冰屑温度计算及影响因素分析

为了分析冰层回转切削钻进时冰屑温度的变化规律,借鉴金属切削理论,建立了切削温度计算模型,对钻压、转速、切削具刃前角、切削具切入冰层深度、冰与切削具之间的摩擦系数、冰的抗剪强度以及切削具导热系数等因素对切削温度的影响规律进行了研究.结果表明,上述参数对切削温度均有一定的影响,其中摩擦系数对冰屑的温升影响最大,当摩擦系数增大到0.3时,冰屑的温升可高达9.11℃.钻头转速以及切削具刃前角对冰屑温升也有较大的影响,当钻头转速由30 r/min增大到130 r/min时,冰屑的温升由2.35℃增大到4.35℃;切削具刃前角由15°增大到75°时,冰屑的温升由3.48℃降低到2.42℃.

Theoretical Calculation on Cutting Heat and Its Influence Factors Analysis in Ice Core Drilling

In order to analyze the temperature changes of ice cuttings in drilling process， a mathematical model was constructed based on metal cutting theory. The factors which affected the cutting temperature were studied， including drilling pressure， rotation speed of drilling bit， cutting edge angle， cutting depth， friction coefficient， ice shearing strength， heat conduction coefficient of cutters and so on. The results show that the parameters mentioned all have a certain effects on cutting temperture， particularly the friction coefficient， and when it increases to 0.3， the temperture of the ice cuttings can raise 9.11℃. Moreover， the rotation speed of the drilling bit and the angle of the cutting edge also affect the temperature of ice cuttings. The temperature increases from 2.35℃ to 4.35℃ with the rotation speed increasing from 30r/min to 130r/min， while it decreases from 3.48℃ to 2.42℃ with an increasing of the cutter edge angle from 15° to 75°.