权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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确定和鉴定用于生产 7000 系列高强度沉淀硬化铝合金定制热处理毛坯 (THTB) 的辐照策略。基于用于制造 THTB 的传统线性连续热处理布局，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。该方法基于实验与数值相结合的方法。在第一个工作包 (WP) 中，研究了与温度相关的材料参数。一方面，必须在高温下确定热机械耦合有限元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。该方法基于两步模型。激光热处理的热机械效应将根据所产生的形状变形以及材料特性的分布进行数值模拟。将开发成形过程的机械模拟模型，该模型考虑材料流动行为与温度分布和预应变的关系。第三个工作组将使用工作组 2 中经过验证的有限元模型进行基于有限元的变量计算，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。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，将进行显着性检验以确定最具影响力的因素。最后一个工作包重点关注 WP 2 有限元模型第二步的验证以及该模型在 THTB 流程设计中的应用。根据数值和实验结果，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对成形模拟进行实验验证，并可以比较有关最终零件性能的不同热处理概念。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提高性能。将 WP 3 的替代热处理概念应用的一般准则转移到演示几何体上，可以对结果进行验证。