Process-reliable adjustment of subsurface zone properties in the machining of high-strength and ductile steels using an adaptive manufacturing system

使用自适应制造系统对高强度和延性钢加工中的地下区域特性进行过程可靠的调整

• 批准号: 401800578
• 负责人: Professor Dr. Bernd Breidenstein
• 金额: --
• 依托单位: Institut für Werkstoffkunde (IW)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/401800578?language=en
• 关键词: Process; reliable; adjustment; subsurface; zone

Influencing the component subsurface zone is an elementary step in the manufacturing process. A combination of martensitic hardening of a subsurface zone and near-net-shape manufacturing represents a great potential to produce components with wear-resistant subsurface zones in an energy- and time-saving way. In the first funding period, an in-process soft sensor was developed and a deeper understanding of the transformation of austenitic microstructural constituents into martensite in a turning process was obtained. The aim of the proposed project is to investigate a dynamic feedforward loop for the process-safe adjustment of subsurface zone properties in the machining of high-strength and ductile steels by means of a deformation-induced austenite-martensite transformation. The combination of the geometry to be adjusted, the surface quality and the subsurface condition in the final machining by means of a multi-stage turning process is considered. On the basis of the detected initial state, the appropriate process parameters are set using the knowledge of the interrelationships of the phase transformation in the turning process in order to be able to generate the desired properties in the process. For this purpose, disturbing influences on the transformation of retained austenite during external longitudinal turning under cryogenic cooling in the process are evaluated. The setting of desired target states is based on the modelling of local transformation processes in a technological NC simulation, taking process-related uncertainties into account. With the help of a dynamic subsurface zone model, the prediction of the in-process eddy current characteristics is to be made on the basis of the subsurface zone microstructure. All elements are incorporated into the dynamic feedforward control for the targeted adjustment of the austenite-martensite transformation in the process. Research into the possibilities and limits of the method provides fundamental knowledge on the robustness of setting various specified target values by means of dynamic feedforward control.

影响部件表面下区域是制造过程中的基本步骤。表面下区域的马氏体硬化和近净形制造的组合代表了以节能和省时的方式生产具有耐磨表面下区域的部件的巨大潜力。在第一个资助期内，开发了一种过程中软测量，并对车削过程中奥氏体显微组织成分向马氏体的转变有了更深入的了解。该项目的目的是研究一个动态的前馈回路的加工过程中安全的调整亚表面区域的属性高强度和韧性钢的变形诱导的贝氏体-马氏体转变的装置。考虑了在最终加工中通过多级车削工艺调整几何形状、表面质量和表面下条件的组合。基于检测到的初始状态，利用车削过程中的相变的相互关系的知识来设置适当的过程参数，以便能够在过程中产生期望的特性。为此目的，外部纵向车削过程中的深冷冷却下的残余奥氏体的转变的干扰影响进行了评估。所需目标状态的设置基于工艺NC仿真中的局部变换过程的建模，并考虑到与过程相关的不确定性。在动态次表层模型的帮助下，基于次表层微观结构来预测过程中的涡流特性。所有元素都被纳入动态前馈控制中，用于有针对性地调节过程中的贝氏体-马氏体转变。对该方法的可能性和局限性的研究提供了关于通过动态前馈控制设置各种指定目标值的鲁棒性的基础知识。