sheet metal
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2022 ◽  
Vol 134 ◽  
pp. 104090
Author(s):  
Shani Sharif ◽  
Russell Gentry
Keyword(s):  

2022 ◽  
Vol 171 ◽  
pp. 108791
Author(s):  
Zhenkai Mu ◽  
Jun Zhao ◽  
Qingdang Meng ◽  
Honglei Sun ◽  
Gaochao Yu

2022 ◽  
Vol 9 (2) ◽  
pp. 99-109
Author(s):  
James Enos ◽  
Abigail Burris ◽  
Liam Caulfield ◽  
Robert DeYoung ◽  
Sebastian Houng ◽  
...  

The Army's Lean Six Sigma methodology includes five phases: Define, Measure, Analyze, Improve, and Control (DMAIC); each of these phases includes interaction between the stakeholder and process team. This paper focuses on the application of Lean Six Sigma methodology at Tobyhanna Army Depot to help reduce overruns and repair cycle time within the sheet metal cost center. At the initiation of the project, the process incurred over 4,000 hours of overruns, a situation in which it takes longer to repair an asset than the standard hours allocated for the repair. Additionally, the average repair cycle time, amount of time required to repair an individual asset, exceeded customer expectations by almost four days. The paper describes recommended solutions to address both problems.


Author(s):  
Muhammad Ali Ablat ◽  
Ala’aldin Alafaghani ◽  
Jian-Qiao Sun ◽  
Chetan Nikhare ◽  
Ala Qattawi

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 142
Author(s):  
Yanfeng Yang ◽  
Cyrille Baudouin ◽  
Tudor Balan

The specific loading-path change during sheet metal forming may lead to some abnormal deformation phenomena. Two-stage orthogonal loading paths without elastic unloading have revealed a phenomenon of apparent loss of normality, further modeled in the literature by non-normality theories. In this paper, a particular orthogonal strain-path change is investigated using the Teodosiu–Hu hardening rule within an associated plasticity framework. The results indicate that cross work-hardening has a significant contribution to the apparent loss of normality and subsequent asymmetric yield surface evolution. Detailed contributions of the model’s ingredients and features are clarified. The developed material model is intended for sheet metal forming simulation applications.


Author(s):  
Sandra Friedrich ◽  
Thoralf Gerstmann ◽  
Carolin Binotsch ◽  
Birgit Awiszus

AbstractThe striving for energy savings by lightweight construction requires the combination of different materials with advantageous properties. For joining sheet metal components, clinching offers a good alternative to thermal joining processes. In contrast to thermal joining processes, the microstructure in the joining zone remains largely unaffected. Conventional clinch joints, however, have a protrusion on the underside of the joint, which restricts their use in functional and visible surfaces. Flat-clinching minimizes this disadvantage by using a flat anvil instead of a die. Due to the flatness on the underside, it can be used in visible and functional surfaces. This paper deals with the increase of joint strength by using an auxiliary joining element (AJE) in the second forming stage. To achieve optimum improvement in the joint strength of an aluminum Al99.5 H14 sheet metal joint and to save costs, the AJE was varied numerically in terms of volume, material and basic shape. The geometric parameters (e.g., interlocking f and neck thickness tn) do not allow direct derivation of the joint strength. For this reason, the 2D clinch model was extended for the first time to include 3D load models (cross tension, shear tension). To validate the numerical results, optimized flat-clinch joints with AJE and the associated load tests were implemented experimentally. The numerical models were used to improve the process development.


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