环形热管砂轮强化磨削弧区换热研究

磨削过程中,在超过临界值的高磨削热流密度下,即使有再多的磨削液进入弧区也无济于事,因为磨削液既已处于成膜沸腾状态,由于工件表面所覆盖的汽膜层的阻挡,磨削液很难真正起到换热作用,如不及时采取相应的措施,工件必定很快发生烧伤。本文结合热工领域的换热技术,提出一种基于热管技术强化磨削弧区换热的全新构想,并在此基础上研制了新型的环型热管砂轮,以大幅提高弧区临界热流密度。最后,分别使用环形热管砂轮和普通砂轮进行磨削测温试验,验证了环形热管砂轮高速疏导磨削热,降低磨削温度,从而提高材料去除率的巨大潜力。

Investigation of Enhancing Heat Transfer in Grinding Zone with Loop Heat Pipe Wheel

During the grinding process,once the coolant comes into film boiling state,the vapor film on the work piece surface will impede the coolant to exchange heat.Consequently,more coolant will not helpful when high heat flux exceeds critical value.The workpiece surface will also burn immediately if there is no measure for this.A new conception of using heat pipe to enhance heat transfer in the grinding zone is put forward combining with the heat transfer technology of thermal engineering.A new type grinding wheel named the loop heat pipe wheel is developed for greatly increasing the critical heat flux.Finally,the measuring experiments of grinding temperature are carried out with loop heat pipe wheel and normal grinding wheel respectively to verify the great potential of the heat pipe for removing grinding heat and decreasing grinding temperature,thus increasing the material removal rate.