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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识别和资格的辐照策略的生产裁缝热处理坯（THTB）的高强度，沉淀硬化铝合金的7000系列。基于传统的线性连续热处理布局的制造THTB，新的照射概念将被推导出来，以改善热处理区域的形状变形以及材料性能的均匀性。这种方法是基于一个组合的实验-数值方法。在第一个工作包（WP）的温度依赖的材料参数进行了研究。一方面，热力耦合有限元模型的相关输入参数必须在高温下确定。另一方面，必须研究短期热处理后的机械性能，以便模拟THTB的局部适应流动行为。这些输入参数将用于WP 2中的建模。这种方法基于两步模型。激光热处理的热机械效应将被建模数值相对于所产生的形状变形以及材料性能的分布。将开发一个成形过程的力学模拟模型，该模型考虑了材料流动行为与温度分布和预应变的关系。将在第三个WP中使用WP 2中验证的FE模型进行基于FE的变量计算，以确定不同定量和定性因素对形状变形和热处理均匀性命令变量的影响。将开发新的热处理策略。数值结果将通过实验研究进行验证。根据这些结果，将进行显著性检验，以确定最具影响力的因素。最后一个工作包的重点是验证的第二步的FE模型从WP 2以及该模型的应用程序的过程设计的THTB。根据数值计算和实验结果，将对演示器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对成形模拟进行实验验证，并对不同热处理方案的最终部件性能进行比较。与传统的线性连续激光热处理相比，新辐照概念的应用必须改善性能。将WP 3中的替代热处理方案应用于验证机几何形状的一般准则的转移，使结果的合格性成为可能。