【摘要】 切屑形貌是影响深孔加工质量的重要因素之一。本文以冷却液油压为单因素变量,对Φ17 mm标准枪钻加工的流场进行CFD仿真模拟和试验研究,探讨了冷却液油压对切屑成形和断裂的影响规律。结果表明:在切屑成形初期,冷却液的流动会强化切屑侧向卷曲,继而影响切屑螺旋卷曲半径和切屑的螺旋圈数,其中侧向卷曲程度随切削液进口压力增大呈先增大后减小的趋势,在3 MPa时卷曲程度最小。此外,在排屑过程中,流场内的收缩流股是排出切屑和迫使切屑发生二次断裂的主要影响因素,其对排屑和断屑的影响与进口油压呈正比。更多还原

【Abstract】 Chip shape is one of the important factors that affect the processing quality of the deep hole. The flow field of 17 mm standard gun-drill is simulated by taking the coolant pressure as a single factor variable,and the influence of coolant pressure on chip forming is discussed by combining with experiments in this paper. The results show that at the initial stage of chip forming,the flow of cutting fluid will intensify the lateral crimp of chips,and then affect the crimp radius of the chip and the number of turns of the crimp screw. The lateral crimp degree increases first and then decreases with the increase of coolant pressure,and the crimp degree is the smallest at 3 MPa. In addition,during the chip removal process,the stream shrinking in the flow field is the main influencing factor that drive and force the chip to break again,and their influence on the chip removal and chip breaking is proportional to the coolant pressure.更多还原