关键词: 重载切削；刚性；齿轮传动；粗糙度

Abstract: In this paper, the loss of heavy-duty cutting function and finishing ability before the transformation of the main drive system of the TH42250 CNC gantry machining center is analyzed, and the overall transformation design scheme of the box structure, shaft, gear and assembly is proposed in terms of improving accuracy, strength and materials. Through the processing, assembly and operation of new spare parts, good results are achieved, and success are achieved in terms of operation stability, temperature rise control, processing accuracy, cost control, and maintenance cost savings. The heavy-duty cutting function and machining accuracy of the equipment returned to the factory design level, which could be used for reference in the fault repair of other main transmission systems and the design and development of gearboxes.

Key words: Heavy-duty cutting; Rigid; Gear transmission; Roughness