Influence of cooling of forging dies on the process-related microstructural changes in the surface zone and their effect on wear behaviour

锻模冷却对表面区域与工艺相关的微观结构变化的影响及其对磨损行为的影响

• 批准号: 349885770
• 负责人: Professor Dr.-Ing. Bernd-Arno Behrens
• 金额: --
• 依托单位: Institut für Umformtechnik und Umformmaschinen (IFUM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/349885770?language=en
• 关键词: Influence; cooling; forging; dies; process

The surface zones of hot forging tools undergo local microstructural changes due to high loads. This affects the wear behavior significantly. Therefore, the analysis of these manipulated surface zones in die forging and their effect on wear behavior is of great importance. The microstructural changes mainly depend on the location and time dependent temperature behavior in a die which is highly influenced by the tool cooling system. The research project aims at fundamentally examining the influence of the die cooling system on the process-related microstructural changes in the surface zones. The main objective is to investigate the microstructural changes under varying cooling conditions and determine the correlation between the microstructural changes and the wear behavior. Another minor objective is to determine the influence of the combined tribological and mechanical loads on the microstructure in the surface zones of hot forging dies. The research objectives will be achieved by varying the cooling and lubrication concepts by adapting the cooling gradient through different spraying parameters and different stationary die temperatures. Functionally isolating cooling and lubrication allows a specific configuration of the cooling process through a timed regulation of the amount of coolant per area. The die will be cooled by an appropriate surface water spray cooling system. Different cooling strategies will be developed in order to configure the cooling process. The separation of the lubrication and cooling functions eliminates the conventional lubrication with water-graphite suspension, thus the die will be lubricated through electrostatic powder coating. Depending on the powder used, different friction conditions between the die and the workpiece can be generated and the tribological stresses can be varied. The mechanical stress of the die can be altered by forging steels of different strengths. The gained results of the research project should help to optimize the die cooling regarding the microstructural changes to improve wear behavior and service life efficiently.

热锻工具的表面区域由于高载荷而经历局部显微组织变化。这会显著影响磨损行为。因此，分析模锻过程中这些操纵表面区域及其对磨损行为的影响具有重要意义。显微组织的变化主要取决于模具中的位置和时间相关的温度行为，模具中的温度行为受到模具冷却系统的高度影响。该研究项目旨在从根本上研究模具冷却系统对表面区域与工艺相关的微观结构变化的影响。主要目的是研究在不同冷却条件下的显微组织变化，并确定显微组织变化和磨损行为之间的相关性。另一个次要目标是确定热锻模具表面区域中的微观结构上的摩擦学和机械载荷的组合的影响。研究目标将通过改变冷却和润滑的概念，通过适应冷却梯度，通过不同的喷涂参数和不同的固定模具温度来实现。功能隔离的冷却和润滑允许通过定时调节每个区域的冷却剂量来实现冷却过程的特定配置。模具将通过适当的表面喷水冷却系统进行冷却。将开发不同的冷却策略以配置冷却过程。将润滑和冷却功能分离，取消了传统的水-石墨悬浮液润滑，采用静电粉末喷涂方式润滑模具。根据所用粉末的不同，模具和工件之间可能产生不同的摩擦条件，摩擦应力也可能不同。模具的机械应力可以通过锻造不同强度的钢来改变。研究结果将有助于优化模具的冷却，以有效地提高磨损性能和使用寿命。