Preparation method of draw-bar box

摘要: The invention discloses a preparation method of draw-bar box. box comprises an aluminum alloy framework, wherein the framework transverse frameworks and longitudinal frameworks, are fixedly connected to two sides on outer surfaces bent arranged at measuring ends through holes formed surface thealuminum is coated with shell, inner shell both wear-resistant layer. plastic characteristic body can be guaranteed, meanwhile, supporting safety multiple composite materials combined layer,the stability effectively improved, using effect production facilitated.