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.

本研究项目的目的是识别和资格，用于生产高强度，降水量可硬化的铝合金的量身定制热处理的毛坯（THTB）。基于用于制造THTB的常规，线性连续的热处理布局，将得出新的辐射概念，以改善有关形状失真和材料特性的热处理区域的均匀性。这种方法基于一种结合的实验数方法。在第一个工作包（WP）中依赖温度的材料参数中。一方面，必须在高温下确定热机械耦合模型的相关输入参数。另一方面，必须研究短期热处理后的机械性能，以模拟THTB的局部调整流动行为。这些输入参数将用于WP2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针对所得的形状失真以及材料特性的分布进行单独建模。将开发用于形成过程的机械仿真模型，该模型将考虑温度分布和预归结的依赖性的材料流动行为。使用WP2的经过验证的FE模型在第三个WP中进行基于FE的变体计算，以确定不同定量和定性因子对热处理形状失真和同质性的命令变量的影响。将制定新的热处理策略。数值结果将通过实验研究来验证。基于这些结果，将进行最大的影响因素。最后一个工作包的重点是验证WP 2的Fe模型的第二步以及模型在THTB的过程设计中的应用。基于数值和实验结果，将对演示器几何形状进行局部激光处理，然后进行深度绘制过程。最终部分的数字化可以实验验证形成模拟，以及对所得组件特性的不同热处理概念的比较。与常规的线性激光热处理相比，新的辐照概念的应用必须改善这些性能。从WP 3上应用替代热处理概念在示威者几何形状上应用替代热处理概念的转移使得可以获得结果的资格。