Wang CS, Hsiao YH, Chang HY, Chang YJ (2022) Process parameter prediction and modeling of laser percussion drilling by artificial neural networks. Precis Eng J Int Soc Precis Eng Nanotechnol 78:114–123 J Mater Process Technol 140:335–339Įgashira K, Hamafuji H, Araki S, Yamaguchi K (2022) Dieless punching of ultrasmall-diameter holes. Hocheng H, Tsao CC (2003) Comprehensive analysis of delamination in drilling of composite materials with various drill bits. 5th International Conference on High Speed Machining 723:481–485 Liu G, Mao ZX (2012) Study on drilling force of carbide drill with different edge preparation. Liu CT, Liu W, Xu XG, Zhu LK, Luo F (2022) Effect factors and evaluation method of part accuracy formed by ultrasonic micro-punching with a flexible punch. Marimuthu S, Elkington H, Smith B (2022) Millisecond fibre laser drilling of thick-section aerospace alloy. Experimental result shows that the proposed punching process can complete the punching of copper, aluminum, and steel sheet plates.Īlevizakos V, Mosch R, von See C (2023) Influence of multiple used implant drills on their cutting performance and fracture resistance. In the end, the forming capability is compared through the quality of the fracture surface. Meanwhile, the punching tests were performed, and the feasibility of EPM punching was verified. Through FEA, the punching force and cross-section area are calculated, varying with the punching clearance and magnetization current. During the punching process, the coils only need to be powered 20 ms twice to load and unload punching force at the moment of beginning and end, respectively, which is low energy consumption. Moreover, the power, transmission, and execution systems are integrated into the developed device for loading punching force independently on the sheet metal, which provides a feasible method for the lightweight design of the stamping equipment. With the method based on the electro-permanent magnetic (EPM) technology, the punching process can not only be realized but also the amplitude of the stamping force can be adjusted arbitrarily by altering the excitation current and stamping clearance. The punching force is produced by multiple electromagnetic pole units, namely, electromagnetic cushion (EMC). A novel punching process is proposed in the paper, exploiting magnetic attractive force to punch holes in sheet metal.
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