As a super - hard material, cemented carbide has high hardness and low fracture toughness. When processed using traditional methods, it is characterized by low efficiency, high cost, and poor quality. This paper proposes a laser - ultrasonic composite milling (LUCM) machining process to improve the ultra - precision machining performance of cemented carbide. The motion characteristics of ultrasonic vibration and the characteristics of laser preheating were analyzed, and a theoretical milling force model was established, with prediction results having an error of less than 10 %. Compared to conventional milling (CM), ultrasonic assisted milling (UAM), and laser assisted milling (LAM), the main milling force (Fx), radial force (Fy), and axial force (Fz) values of LUCM were reduced by 23.49 % – 58.50 %, 6.90 % – 39.79 %, and 13.07 % – 29.44 %, respectively. Tool life was extended by 91.63 %, 44.65 %, and 29.46 %, respectively, and surface roughness was reduced by up to 33.05 %. According to the response surface method (RSM) analysis, when the laser power (LP) was 345.775 W, the laser beam diameter (LBD) was 0.236 mm, the distance from laser spot center (DFLSC) was 0.059 mm, and the ultrasonic amplitude (UA) was 2.065μm, the minimum value of the optimized Fx was 70.452 N. In addition, the experimental data were fitted and trained using an artificial neural network (ANN), and the results showed that the experimental and fitted values were highly consistent, with an error of less than ± 2.
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