The formation and effect of interlayer gap in dry drilling of stacked metal materials

摘要

The mechanism of an interlayer gap formation and the influence of an interlayer gap in drilling of stacked metal materials were investigated. The interlayer gap formation is due to material bending by interlayer thrust force. The simplified analytical model was developed in order to show the relationship of the interlayer gap and the various factors, and the minimization of the interlayer gap depends mainly on the push-up force, the interlayer thrust force, and the flexural rigidity of each layer. The experimental research indicated that the interlayer gap size has a significant effect on interlayer burr size. When the interlayer gap is small enough, the effects of the material behavior and the cutting parameters will be attenuated. The different spatial size of burr formation causes the difference between the interlayer burr morphology and the surface layer burr morphology.