Research on Constant Force Polishing Method of Curved Mold Based on Position Adaptive Impedance Control

Abstract The quality and life of the injected product is affected by curved mold surface quality, so the polishing of the mold is essential. Small polishing tool are controlled by constant displacement polishing in the conventional method. The force will vary when polishing the mold with small polishing tool, thus affecting the surface quality of the mold. The robot constant force polishing method is proposed to solve this problem, which is achieved by a position-based impedance control algorithm. The proposed method can produce continuous and stable force. The effect of the constant force control method on the surface quality is analyzed by simulating this paper, proving the correctness of the constant force control method. The initial roughness of the mold surface is 1.912 μm , the result is 1.419 μm in the traditional method, however the result of constant force polishing is 0.807 μm . The percentage of the decrease in surface roughness is 25.78% in the conventional method, whereas the reduce percentage is 57.79% in the constant force control(CFCP) polishing method. The feasibility of the constant force controlled polishing method is verified.