摘要
采用显式有限元程序,对不同刀—屑摩擦系数时的斜角切削过程进行三维仿真实验,研究切屑在前刀面上的流动特性,刀—屑摩擦对切屑流动方向和螺旋卷曲半径的影响规律和作用机理。结果表明,斜角切削时,切屑从切削刃处以倾斜方向流出,然后沿前刀面产生侧向弯曲,因此切屑流出速度方向与刀刃法向的夹角逐渐增大;当切屑与前刀面分离后,形成螺旋卷屑排出。刀—屑间摩擦力的分布情况是引起切屑在前刀面上产生侧向弯曲的主要原因。随着刀—屑摩擦系数的增大,切屑在前刀面上侧向弯曲曲率减小,而切屑螺旋卷曲半径增大。而且,刀具前角越小,刀—屑摩擦对切屑流动特性的影响越大。
The oblique cutting processes with different tool-chip friction coefficients were simulated by using explicit finite element code. The chip flow characteristics on the tool rake face,the mechanism and the effects of tool-chip friction on the chip flow direction and crimp radius were investigated. It is shown that,in the oblique cutting,the chip outflows with an inclined angle from the cutting edge and bends laterally on the tool rake face,thus,the angle between the chip flow velocity and the normal of cutting edge increases gradually. The chip forms a helical coil when it separates from the tool rake face. The distribution of the tool-chip friction force is the main reason for the lateral bending of chip on the tool rake face. With the increase of tool-chip friction coefficient,the chip＇s lateral bending curvature decreases,and the radius of helical coil increases. Moreover,the smaller the tool rake face is,the greater the effect of tool-chip friction on chip flow characteristics is.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2010年第11期1491-1497,共7页
Acta Armamentarii
基金
国家自然科学基金资助项目(50975191)
关键词
机械制造工艺与设备
斜角切削
流屑特性
刀—屑摩擦
有限元法
machinofacture technique and equipment
oblique cutting
chip flow characteristics
tool-chip friction
finite element method
