Research on effect of pre-stress on cutting force of metal bar surface notching in low-stress cropping

Abstract Under the low-stress cropping working condition, a pre-stress notching technology is proposed. According to the force and deformation features of the bar, a cutting force model of notching is established to divide the cutting area into three parts and analyze the mechanism of splitting and friction respectively. The pre-stress notching experiment platform is built to conduct the comparison test between the cutting force of notching under the pre-stressed state and the free state. The experimental results show that the reasonable pre-stress state reduces the shear part and the friction part by 25.4% and 47.8% respectively, which can effectively improve the cropping efficiency and prolong the durability of the cutting tool.