铝合金大中型挤压材生产现状与发展水平1.生产现状。在各种结构、装饰和功能材料中,铝合金型材是一种节能、环保型材料。随着科学技术的不断进步和国民经济的快速持续发展,各种大中型扁宽、薄壁、高精、复杂的实心和空心型材应运而生,成为了许多重要领域,如航天航空、交通运输 Large and medium-sized aluminum alloy extrusion production status and development level 1. Production status. Among various structural, decorative and functional materials, aluminum alloy profiles are an energy-saving and environment-friendly material. With the continuous improvement of science and technology and the rapid and sustained development of the national economy, various medium and large size flat, thin-walled, high-precision and complex solid and hollow profiles came into being and became many important fields such as aerospace, transportation