This paper presents a new model for formation of the feed-direction burr in drilling process,and the drilling burrs types are classified and analyzed. Then the main factors affecting the feed-direction burr formation in drilling are pointed out.On the basis of the experiment and theoretical analysis,the forming and changing process of burr is uncovered. Furthermore,a diverse range of measures to restrain and decrease the drilling burr have been advanced,such as overlapping workpiece,selecting drilling param...