Surface coating for non-lubricated deep drawing of stainless steel

在不锈钢的干式金属板成形中，由于与成形工具的强烈接触而产生的粘着磨损是一个问题。因此，需要对刀具表面进行适当的涂层。这个项目的目的是使不锈钢板的非润滑成型由坚硬的颗粒从基体中脱颖而出，以增加耐磨性和耐久性，并减少表面的金属性质，以保护工具表面免受粘着磨损。因此，在三维刀具几何形状上进行激光熔覆层沉积和在功能表面进行激光烧蚀微加工的工艺链将被应用。第一个资助期的重点是深拉深工具表面涂层的生成和表征。第二阶段研究了材料在干燥成形过程中的摩擦学行为，以及主要影响因素，包括硬颗粒尺寸和距离、接触面积比和金属基体的烧蚀深度。这种表面涂层在干拉深应用中的行为进行了分析和评估，并与润滑拉深过程进行了比较。第三个资助期的重点是通过硬颗粒的熔化和团聚来增加刀具表面在高载荷区域的接触面积比，以产生适应的刀具表面，以满足干深拉深工艺中的各种载荷能力。

In dry sheet metal forming of stainless steel, adhesive wear is a problem arising from intense contact with the forming tool. A suitable coating of the tool surface is thus required. The aim of this project is to enable non-lubricated forming of stainless steel sheet by a plateau out of hard particles standing out of the matrix in order to increase wear resistance and durability, and to lessen the metallic nature of the surface to protect the tool surface against adhesive wear. Therefore, a process chain involving laser beam cladding for layer deposition on 3d tool geometries and laser ablation for micro machining of the functional surfaces shall be applied. the focus of the first funding period was on the generation and characterization of surface coatings for deep drawing tools. The second period addressed the understanding of the tribological behavior of the materials during dry forming and main influences including hard particle size and distance, the contact area ratio, and the ablated depth of the metal matrix. The behavior of such surface coatings in a dry deep drawing application was analyzed and assessed in comparison to a lubricated drawing process. The emphasis of the third funding period is to increase the contact area ratio of the tool surface in the areas of high loads by melting and agglomeration of the hard particles to generate an adapted tool surface to meet the various load capacities in a dry deep drawing process.