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为了探索包覆型材的挤压规律和研究制定其参数的计算方法,把考虑基体材料和包覆材料强度性能的各种因素,以及影响包覆层在型
In order to explore the rule of extrusion of clad profiles and to study and formulate the calculation method of its parameters, various factors that consider the strength properties of base materials and clad materials,