Surface structures on deep drawing tools by machine hammer peening to reduce friction and wear

通过机锤喷丸对深拉工具的表面结构进行喷丸处理，以减少摩擦和磨损

基本信息

批准号：
274033148
负责人：
Professor Dr.-Ing. Fritz Klocke
金额：
--
依托单位：
Werkzeugmaschinenlabor - WZL
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/274033148?language=en
关键词：
Surface structures deep drawing tools

项目摘要

Deep drawing is a major production technology of the automotive industry for the production of three-dimensional components. Recent trends enforce the use of high strength steels. Therefore, the deep drawing tools have to fulfill stringent requirements on their friction characteristics and wear-resistance. Worldwide friction and wear in industrial processes for tool and die manufacturing cause costs up to billion euros. A promising approach to decrease friction and wear in forming processes is the use of special designed surface structures on deep drawing tools. The description of tribological performances using surface-structured tools is not sufficiently explored according to the current state of the art. For surface structures on sheet metal workpieces, positive impacts on the friction and wear characteristics of the interacting solids were already shown, but they differ significantly from surface structures on tools in their plastic flattening during deep drawing. Accordingly, the challenge is to develop wear-resistant surface structures on deep drawing tools which have a positive impact on friction and wear characteristics.The surface structures will be produced by the insufficient explored technology machine hammer peening. Machine hammer peening distinguishes itself from other structuring processes by the induction of residual compressive stresses and strain hardening. Due to an easy integration into existing manufacturing processes and the flexible adjustable process kinematics machine hammer peening offers a high potential to fulfill the requirements on the structuring of low-friction and wear-resistant tool structures.The aim of this project is the development of an analytic-empiric and numeric process models to describe and explain the fundamental cause-effect-relationships of surface structures produced by machine hammer peening intended to decrease friction and wear in deep drawing. The first step explores basic correlation between the machine hammer peening process parameters and the surface layer state. On this basis, in a second step the impact of structured surfaces on friction and wear is described und explained. The investigation is focused on the comprehension of tribological mechanism of action considering tool surfaces structured by machine hammer peening, lubricant and sheet metal material. The gained fundamental understanding allows a purposeful process design in order to decrease the friction in deep drawing processes. The exploration of the impact of the surface structure on the wear characteristics with respect to the determined friction properties follows in conclusion.

拉深是汽车工业生产三维零部件的主要生产技术。最近的趋势强制使用高强度钢。因此，拉深工具必须满足其摩擦特性和耐磨性的严格要求。全球范围内工具和模具制造工业流程中的摩擦和磨损造成的成本高达数十亿欧元。减少成形过程中摩擦和磨损的一种有前途的方法是在深拉工具上使用特殊设计的表面结构。根据目前的技术水平，使用表面结构化工具的摩擦学性能的描述尚未得到充分探索。对于金属板材工件上的表面结构，已经显示出对相互作用固体的摩擦和磨损特性的积极影响，但它们在深冲压过程中的塑性压扁方面与工具上的表面结构有显着不同。因此，面临的挑战是在深拉工具上开发耐磨表面结构，对摩擦和磨损特性产生积极影响。表面结构将通过尚未充分探索的机器锤击技术来生产。机锤喷丸与其他结构化工艺的区别在于产生残余压应力和应变硬化。由于易于集成到现有制造工艺中以及灵活可调的工艺运动学，锤击机在满足低摩擦和耐磨工具结构的构造要求方面具有很高的潜力。该项目的目的是开发一种分析经验和数值过程模型，用于描述和解释机锤喷丸产生的表面结构的基本因果关系，旨在减少深冲中的摩擦和磨损。第一步探索机锤喷丸工艺参数与表层状态之间的基本关联。在此基础上，在第二步中描述和解释了结构化表面对摩擦和磨损的影响。该研究的重点是理解由机锤喷丸、润滑剂和金属板材构成的工具表面的摩擦学作用机制。获得的基本理解可以进行有目的的工艺设计，以减少深拉工艺中的摩擦。结论是根据确定的摩擦特性探索表面结构对磨损特性的影响。