Laser assisted strategies for the manufacturing of property-enhanced Tailor Heat Treated Blanks

用于制造性能增强的定制热处理毛坯的激光辅助策略

基本信息

批准号：
386418429
负责人：
Professorin Dr.-Ing. Marion Merklein
金额：
--
依托单位：
Lehrstuhl für Fertigungstechnologie (LFT)
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 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/386418429?language=en
关键词：
Laser assisted strategies manufacturing property

项目摘要

The objective of the present research project consists of the identification and qualification of irradiation strategies for the production of Tailor Heat Treated Blanks (THTB) of high strength, precipitation hardenable aluminum alloys of the 7000 series. Based on conventional, linear-continuous heat treatment layouts for the manufacturing of THTB, new irradiation concepts will be derived in order to improve the homogeneity of the heat treated area with respect to shape distortion as well as material properties. This approach is based on a combined experimental-numerical methodology. In the first work package (WP) temperature-dependent material parameters are investigated. On the one hand the relevant input parameters for a thermo-mechanical coupled FE-model have to be determined at elevated temperatures. On the other hand mechanical properties after a short-term heat treatment have to be investigated in order to model the locally adapted flow behavior of THTB. These input parameters will be used for modeling in WP2. This approach is based on a two-step model. The thermo-mechanical effect of a laser heat treatment will be modeled numerically with respect to the resulting shape distortion as well as the distribution of material properties. A mechanical simulation model for forming processes will be developed, which considers the material flow behavior in dependency of temperature distribution and pre-straining. A FE-based calculation of variants will be carried out in the third WP using the validated FE model from WP2 to identify the influence of different quantitative as well as qualitative factors on the command variables of shape distortion and homogeneity of the heat treatment. New heat treatment strategies will be developed. The numerical results will be verified by experimental investigations. Based on these results a significance test to identify the most influencing factors will be carried out. The last work package focuses on the validation of the second step of the FE-model from WP 2 as well as the application of the model for the process design of THTB. Based on numerical and experimental results a local laser heat treatment will be carried out for a demonstrator geometry, followed by a deep-drawing process. The digitalization of the final part enables the experimental validation of the forming simulation as well as the comparison of different heat treatment concepts regarding the resulting component properties. The application of new irradiation concepts has to improve the properties compared to a conventional, linear-continuous laser heat treatment. The transfer of the general guidelines for the application of alternative heat treatment concepts from WP 3 on the demonstrator geometry enables the qualification of the results.

本研究项目的目标包括基于传统的线性连续热处理布局，确定和鉴定用于生产 7000 系列高强度、可沉淀硬化铝合金的定制热处理坯料 (THTB) 的辐照策略。对于 THTB 的制造，将衍生出新的辐照概念，以提高热处理区域在形状变形和材料性能方面的均匀性。该方法基于组合。在第一个工作包 (WP) 中，一方面需要研究热机械耦合有限元模型的相关输入参数，另一方面必须在高温下确定。必须研究短期热处理后的机械性能，以便对 THTB 的局部适应流动行为进行建模，这些输入参数将用于 WP2 中的建模。激光热处理的机械效应将针对所产生的形状变形以及材料特性的分布进行数值建模，并将开发成形过程的机械模拟模型，该模型考虑了材料流动行为与温度分布和预应变的关系。第三个 WP 将使用 WP2 中经过验证的有限元模型进行基于变体的计算，以确定不同定量和定性因素对形状畸变和热处理均匀性命令变量的影响。得到开发。结果将通过实验研究进行验证，最后一个工作包将重点验证 WP 2 的有限元模型的第二步以及该模型在 THTB 工艺设计中的应用基于数值和实验结果，将对演示几何形状进行局部激光热处理，然后进行深拉工艺，最终零件的数字化可以进行实验验证。成形模拟及比较与传统的线性连续激光热处理相比，新的辐照概念的应用必须提高性能 WP 3 中替代热处理概念应用的一般准则。演示几何形状可以验证结果。