Dependencies of the die-roll height during fine blanking of case hardening steel 16MnCr5 without V-ring using a nesting strategy

Voigts, Herman; Trauth, Daniel; Feuerhack, Andreas; Mattfeld, Patrick; Klocke, Fritz

doi:10.1007/s00170-017-1313-y

Cited by 14 publications

(4 citation statements)

References 14 publications

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“…Among those can be found material, heat treatment condition, sheet thickness, geometry of the cutting line, cutting speed, and cutting temperature. Small changes of the process might have great effect on the outcome, such as geometry of the cutting line [5], part shape [6], die clearance in the fine blanking tool [7], microstructure of the metal sheet [8], nesting strategies [9], heat treatment of the material [10] or oxide layers on the metal sheet [11]. For the investigation of fine blanking with inductive heating, the most important influencing parameters are cutting temperature and sheet metal material, as those parameters show especially high impact on the material properties in the shear zone.…”

Section: Initial Situation and Motivationmentioning

confidence: 99%

“…As can be seen in Figure 3, every stroke produces two parts, which can subsequently investigated and thus the number of specimens is enlarged. However, it has to be considered that the parts produced in different fine blanking cavities in the same stroke can be of slightly different quality [9]. In order to combine the fine blanking process with a previous inductive heating process, the specimens of the dimensions l x w x s = 100 x 68 x 6 mm were prepared and heated and subsequently fine blanked via single stroke.…”

Section: Approach and Proceduresmentioning

confidence: 99%

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Investigation of the Micro Hardness at the Cut Surface of Fine Blanked Parts with Variation of Sheet Material and Cutting Temperature

Weiser

Feuerhack

Bergs

2021

KEM

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Fine blanking is a production technology of high importance especially for the automotive industry. As a procedure of sheet metal separation, it is possible to produce complex parts in a single stroke. As a difference to conventional punching, the cutting surface of fine blanked parts can often be used as a functional surface without further process steps. However, fine blanking as a forming process changes the microstructure of the metal sheet to a higher extend than cutting or machining processes. Due to this, it is of utmost importance to investigate the cause-effect-relations between the fine blanking process parameters and the resulting properties of the fine blanked part. Especially the condition of the cut surface as an important quality criterion has to be investigated. The quality characteristics of the cut surface of fine blanked parts are often subject of investigations. In addition, it would be of importance to investigate how the material properties in the shear zone are changed by the fine blanking process. This on one hand in turn can enable conclusions to be drawn about possible punch wear. If, on the other hand, hardening of the cut surface takes place as a result of fine blanking, then this could have a positive influence on the application properties of fine blanked components. Thus, an experimental fine blanking investigation of the micro hardness of the cutting surface has been made with variation of steel material and cutting temperature. It could be demonstrated that the micro hardness increases in direction towards the burr. This is independent on material and cutting temperature.

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Section: Initial Situation and Motivationmentioning

confidence: 99%

Section: Approach and Proceduresmentioning

confidence: 99%

Investigation of the Micro Hardness at the Cut Surface of Fine Blanked Parts with Variation of Sheet Material and Cutting Temperature

Weiser

Feuerhack

Bergs

2021

KEM

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“…However, regardless of the good quality in general, all work pieces differ in their quality features that are the tear-off surface, fine cracks in the functional surface, the burr and, especially, die roll [17]. The die roll is a roundish defect at the cutting edge of the work piece, caused by the plasticity of the material, and it is the most important potential defect in fine blanking as it reduces the dimensional accuracy of the cutting edge [18]. Thus, thicker sheet metal strips and secondary machining must be used to compensate for the die roll and improve dimensional accuracy.…”

Section: Case Study: a Fine Blanking Linementioning

confidence: 99%

A Case for Integrated Data Processing in Large-Scale Cyber-Physical Systems

Glebke¹,

Henze²,

Wehrle³

et al. 2019

Proceedings of the Annual Hawaii International Conference on System Sciences

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Large-scale cyber-physical systems such as manufacturing lines generate vast amounts of data to guarantee precise control of their machinery. Visions such as the Industrial Internet of Things aim at making this data available also to computation systems outside the lines to increase productivity and product quality. However, rising amounts and complexities of data and control decisions push existing infrastructure for data transmission, storage, and processing to its limits. In this paper, we exemplarily study a fine blanking line which can produce up to 6.2 Gbit/s worth of data to showcase the extreme requirements found in modern manufacturing. We consequently propose integrated data processing which keeps inherently local and small-scale tasks close to the processes while at the same time centralizing tasks relying on more complex decision procedures and remote data sources. Our approach thus allows for both maintaining control of field-level processes and leveraging the benefits of "big data" applications.

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“…The nesting strategy was used by Voigts et al in the fine blanking process to investigate the height of die-roll [12]. Luo et al used the Oyane fracture criterion and proposed a method for minimizing the length of die-roll in the fine blanking process.…”

Section: Introductionmentioning

confidence: 99%

Application of Finite Element Method to Analyze the Influences of Process Parameters on the Cut Surface in Fine Blanking Processes by Using Clearance-Dependent Critical Fracture Criteria

Myint

Hagihara

Tanaka

et al. 2018

JMMP

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The correct choice of process parameters is important in predicting the cut surface and obtaining a fully-fine sheared surface in the fine blanking process. The researchers used the value of the critical fracture criterion obtained by long duration experiments to predict the conditions of cut surfaces in the fine blanking process. In this study, the clearance-dependent critical ductile fracture criteria obtained by the Cockcroft-Latham and Oyane criteria were used to reduce the time and cost of experiments to obtain the value of the critical fracture criterion. The Finite Element Method (FEM) was applied to fine blanking processes to study the influences of process parameters such as the initial compression, the punch and die corner radii and the shape and size of the V-ring indenter on the length of the sheared surface. The effects of stress triaxiality and punch diameters on the cut surface produced by the fine blanking process are also discussed. The verified process parameters and tool geometry for obtaining a fully-fine sheared SPCC surface are described. The results showed that the accurate and stable prediction of ductile fracture initiation can be achieved using the Oyane criterion.

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Dependencies of the die-roll height during fine blanking of case hardening steel 16MnCr5 without V-ring using a nesting strategy

Cited by 14 publications

References 14 publications

Investigation of the Micro Hardness at the Cut Surface of Fine Blanked Parts with Variation of Sheet Material and Cutting Temperature

Investigation of the Micro Hardness at the Cut Surface of Fine Blanked Parts with Variation of Sheet Material and Cutting Temperature

A Case for Integrated Data Processing in Large-Scale Cyber-Physical Systems

Application of Finite Element Method to Analyze the Influences of Process Parameters on the Cut Surface in Fine Blanking Processes by Using Clearance-Dependent Critical Fracture Criteria

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