近几十年来,随着科学技术的发展,各种新材料、新结构、形状复杂的精密机械零件大量涌现,对机械制造业提出了一系列迫切需要解决的新问题。 In recent decades, with the development of science and technology, various new materials, new structures and sophisticated mechanical parts with complex shapes have emerged. As a result, a series of new problems urgently needed to be solved have been put forward for the machinery manufacturing industry.