Measurement and modeling of geometric accuracy when broaching profile grooves

拉削轮廓槽时几何精度的测量和建模

• 批准号: 538086781
• 负责人: Professor Dr.-Ing. Thomas Bergs
• 金额: --
• 依托单位: Werkzeugmaschinenlabor - WZL
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/538086781?language=en
• 关键词: Measurement; modeling; geometric; accuracy; when

The aim of the project applied for is the development of an integral model for the prognosis of the achievable shape and dimensional accuracy when broaching safety-critical engine components. Current technological developments in the design of engines for the aviation industry result in more filigree structures, increasing aspect ratios and narrower tolerance fields of the shape and dimensional accuracies. The broaching of pro-filed grooves is the critical process step in the production of turbine disks. Due to the fixed tool geometry, adaptive process control to achieve the geometric specifications is not possible. Using empirically determined process data, such as the specific cutting force components, and a geometric penetration calculation of the cutting cross-sections, the dimensional and form deviations that occur are predicted by means of numerical simulations. Based on the integral model to be developed, a knowledge and model-based tool and process design can be carried out with the aim of increasing the geometric accuracy or continuing to meet the increasing tolerance requirements due to current developments. The result is a design model for systematic tool geometry and process design to meet the geometric requirements of profile geometries and their functional surfaces. This project investigates the influences of component and tool geometry and process parameters during broaching on the shape deviations of profile grooves. By investigating and modelling the elastic deformation in the manufacturing process that leads to form and position deviations of the profile grooves, new models and methods for quality assurance and tool design are made available to machining research.

该项目的目的是开发一个整体模型，用于预测拉削安全关键发动机部件时可达到的形状和尺寸精度。当前航空工业发动机设计中的技术发展导致更多的细丝结构、增加的纵横比和更窄的形状和尺寸精度的公差范围。在涡轮机盘的生产中，拉削成形槽是关键的工艺步骤。由于固定的工具几何形状，自适应过程控制，以实现几何规格是不可能的。使用经验确定的过程数据，例如特定的切削力分量，以及切削横截面的几何穿透计算，通过数值模拟来预测出现的尺寸和形状偏差。基于待开发的整体模型，可以进行基于知识和模型的工具和工艺设计，目的是提高几何精度或继续满足由于当前发展而增加的公差要求。其结果是一个系统的工具几何形状和工艺设计的设计模型，以满足轮廓几何形状及其功能表面的几何要求。本计画探讨拉削零件、刀具几何形状及制程参数对型槽形状偏差之影响。通过研究和模拟加工过程中导致型槽形位偏差的弹性变形，为加工研究提供了新的质量保证模型和方法，为刀具设计提供了新的思路。