Burr formation and fracture in oblique cutting

To improve productivity in the machining of parts, advanced technology for deburring becomes more important. In a computer-integrated manufacturing system, the prediction of burr formation or fracture is required. To apply a burr-formation model for orthogonal cutting to a realistic oblique-machining case, a modified model for burr formation and fracture in oblique cutting is developed. For the oblique-chip-formation model. Rubenstein's assumption that chip removal occurs as a result of normal tool/workpiece relative movement is used to determine the material properties of the chip and the geometry of chip formation. It is assumed that roll-over burr is always formed in the cutting direction. Thus burr formation in oblique cutting is considered as the accumulation of burr formation in orthogonal cutting in tile cutting-direction plane. A result of the analysis is that the burr size or fracture location decreases as the inclination angle of oblique cutting increases. Two kinds of burr formation or fracture are observed in experimentation: uniform and inclined burr formation or fracture. Uniform burr formation or fracture can be predicted using the modified model. In the case of inclined burr formation, the equivalent initial tool distance and fracture location are determined using the values obtained in uniform burr formation and the inclination stage.