Cutting and ploughing forces for small clearance angles of hexa-octahedron shaped diamond grains

Investigations on the cutting behaviour of hexa-octahedron diamonds outlined an enormous influence of the grains’ clearance angle on the material removal process. Small negative clearance angles lead to increased specific cutting forces, decreased cutting force ratios and micro-structural changes. This is caused by additional ploughing of the material. This paper presents a kinematic-phenomenological model predicting the specific forces that are caused by the ploughed material. Therefore, the theoretical value of the specific ploughed volume is introduced as characteristic parameter. Results are subsequently compared for different grain cutting situations to experimental data allowing a validation of the proposed model.