【摘要】 高速切削时,切削温度常高达1000℃以上,刀具在高的切削温度作用下发生剧烈磨损和破损,如何提高刀具寿命已成为切削领域研究的重要课题之一。文中用热力学的方法推导了高速切削时刀屑摩擦区的熵产生模型,对熵产生的特点进行了分类探讨。结果表明:切削速度的变化对熵产生的影响最大,但该函数模型无极值,无法预测效率最高时的最佳切削用量,研究结果可对切削过程的优化和刀具材料的选择提供参考。更多还原

【Abstract】 At the time of high speed cutting,the cutting temperature would often reach up to as high as 1000℃ upwards;under the action of high cutting temperature the cutter would produce severe wear and breakage,thus how to enhance the life-span of cutter has already becoming one of the important tasks in the cutting field.Using the method of thermodynamics this paper derived the model for producing entropy in the cutter-chip frictional area at the time of high aped cutting,and a classified discussion was carried out on the characteristics of entropy generation.The result showed that the variation of cutting speed made biggest influences on the generation of entropy,but that functional model has no extremum,and there is no method to predict the optimal cutting parameters at the time of highest efficiency.The result of study could provide references to the optimization of cutting process and to the selection of cutter materials.更多还原