Comparison of Fine and Conventional Blanking Based on Ductile Fracture Criteria

Volume 3 ◽  
2004 ◽  
Author(s):  
Farid R. Biglari ◽  
Amir Tavakoli Kermani ◽  
Mohammad Habibi Parsa ◽  
Kamran M. Nikbin ◽  
Noel P. O’Dowd
Keyword(s):  
Finite Element ◽  
Research Work ◽  
Dimensional Accuracy ◽  
Fracture Path ◽  
Fine Blanking ◽  
Sheared Edge ◽  
Small Clearance ◽  
Finite Element Procedure ◽  
Edge Quality ◽  
Blanking Process

A comparison between fine and conventional blanking is carried out in this paper. In the fine blanking process, V-ring indentation is applied to create hydrostatic pressure and prevent premature fracture in an undesired direction. Furthermore, a small clearance between the punch and die is employed along with a counterforce punch that causes concentrated strain in the sheared band region. A fracture mechanics oriented finite element procedure has been employed in this research work in order to obtain the fracture path. The fracture path is found according to the stress and strain histories which are calculated in each element. The numerical results have shown that the sheared edge quality in the blanking process is strongly influenced by the fracture path. In fine blanking, there are various parameters affecting the sheared edge quality and dimensional accuracy. The finite element calculation is carried out for an axisymmetric model. The commercial finite element code ABAQUS V6.2 is employed along with a controlling program that is written in Visual BASIC.

The effects of tool geometry change on shearing edge finish in fine-blanking of different materials

2003 ◽  
Vol 217 (8) ◽  
pp. 1057-1062 ◽  
Author(s):  
Y C Leung ◽  
L C Chan ◽  
C H Cheng ◽  
T C Lee
Keyword(s):  
Tool Geometry ◽  
Nose Radius ◽  
Fine Blanking ◽  
Burr Height ◽  
Service Period ◽  
Edge Surface ◽  
Edge Quality ◽  
Processing Material ◽  
Die Roll ◽  
Blanking Process

An excellent quality of shearing edge implies that a smooth cutting edge without tearing will be observed on the whole edge surface. This is one of the most significant features of the fine-blanking process. To achieve this good blanking edge quality in fine-blanking, quite a large number of factors need to be considered simultaneously during the operation, such as blanking speed, processing material, product shape, lubrication and tool geometry. Thus, the objective of this paper is mainly to study the influence of tool geometry change in fine-blanking for different materials. This is because the nose radius usually seriously deteriorates with increasing service period in mass production, which eventually causes the entire loss of the specific features of the fine-blanking process. Therefore, a tailor-made experimental study was carried out to investigate the relationship between the punch nose radius and the shearing edge quality, such as the shearing edge surface finish, burr height and die-roll height, during fine-blanking for different types of materials. Consequently, findings show that an increase in the punch nose radius produces a higher percentage of fracture of the blanked edge and increases the amount of burr height.

Design and optimization of a demagnetization device for fine blanking process by finite element analysis

2021 ◽  
Author(s):  
Juan Pablo Arreguin-Rodriguez ◽  
Sergio Antonio Campos Montiel ◽  
Juvenal Rodriguez-Resendiz ◽  
Gonzalo Macias Bobadilla ◽  
Jose Eli Eduardo Gonzalez-Duran
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Fine Blanking ◽  
Design And Optimization ◽  
Blanking Process

Modelling of Fine Blanking Process of the Aluminium Sheets

2011 ◽  
Vol 473 ◽  
pp. 290-297 ◽  
Author(s):  
Wojciech Wieckowski ◽  
Piotr Lacki ◽  
Janina Adamus
Keyword(s):  
Dimensional Accuracy ◽  
Soft Materials ◽  
Fine Blanking ◽  
Technological Quality ◽  
Aluminium Sheets ◽  
The Impact ◽  
Blanking Process ◽  
Cut Surface ◽  
Stress And Strain Distribution

The required technological quality of the blanked products can be achieved through operations of fine blanking. This allows for obtaining products with improved dimensional accuracy and good quality cut-surface. In order to cut products from soft materials, including aluminium and its alloys, the methods of fine blanking with upsetting and fine blanking with reduced clearance are typically employed. The study presents the results of numerical modelling of the fine blanking process for a disk made of 1-millimetre sheet aluminium EN AW-1070A. The goal of the numerical simulations was to evaluate the effect of clearance between blanking die and the punch, and the impact of V-ring indenter on stress and strain distribution in the shearing zone.

Research on Fine Blanking Process with Stepped-Edge Punch

2009 ◽  
Vol 16-19 ◽  
pp. 495-499 ◽  
Author(s):  
Si Ji Qin ◽  
Li Yang ◽  
Jia Geng Peng
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Hydrostatic Stress ◽  
Element Analysis ◽  
Fine Blanking ◽  
Q235 Steel ◽  
Negative Clearance ◽  
Blanking Process ◽  
Industrial Aluminum

The fine blanking process with a stepped-edge punch was researched by finite element method (FEM) and experiment investigation. Finite element analysis showed that the hydrostatic stress of the blank around the edges changes a little during fine blanking process using a stepped-edge punch with negative clearance. The burnish zone of sheared surface increases with the increase of the relative negative clearance. The reasonable forming parameters were presented by a lot of experiment investigations. Parts of three kinds of materials, Q235 steel, copper and industrial aluminum, were formed using fine blanking process with a stepped-edge punch. Full burnish zone were obsearved for all the parts.

Improving the Cut Edge by Counter-Shaving

2007 ◽  
Vol 344 ◽  
pp. 217-224 ◽  
Author(s):  
Hartmut Hoffmann ◽  
Florian Hörmann
Keyword(s):  
Sheet Metal ◽  
Research Work ◽  
Dimensional Accuracy ◽  
Burr Formation ◽  
Cut Edge ◽  
Edge Quality ◽  
Metal Materials ◽  
The Right ◽  
Two Stages

In blanking operations the cut edge of the sheet metal is not clear due to fracturing and burr formation by the shearing process. For precision parts with high quality and dimensional accuracy, often secondary machining is necessary. Shaving, in particular, counter-shaving, is a shearing operation to improve the cut edge quality of a blanked part or punched hole in two stages. This paper introduces a progressive die tool to realize the counter-shaving process on a single acting press. In order to realize the shaving operation in the opposite punching direction, the punch needs to move in counter direction. The burr and fracture zone left on the sheet metal after the first stage will be removed by the counter-shaving operation. By choosing the right process parameter a sharpedge transition is formed, without any rollover, between the upper surface of the sheet metal and the sheared-edge. Different punch geometries as well as the corresponding process parameters were part of the research work in order to improve the cut edge. Experimental and FEM results are presented for two sheet metal materials at three thicknesses.

Grey Prediction on Sheared Edge Quality in Precision Blanking Process for Micro IT Parts

2011 ◽  
Vol 266 ◽  
pp. 122-125
Author(s):  
Bo Wang ◽  
Jing Bo Chen
Keyword(s):  
Prediction Model ◽  
Product Quality ◽  
Grey Prediction ◽  
Grey System ◽  
Time Increment ◽  
Sheared Edge ◽  
Edge Quality ◽  
Burr Width ◽  
Blanking Process

Sheared edge quality of micro IT parts is an important standard to evaluate product quality. In this paper, a prediction model of sheared edge quality based on grey prediction is studied. By mapping the stroke and the burr width to be the time increment and the eigenvalue of grey system, the grey prediction model was established. The dynamic regularity of burr in actual production was attained from the precision blanking experiment and the prediction of burr width was performed. The results show that the model can predict burr width accurately and needs less sampling data. Thus, it is fit for the requirement of manufacturing.

Finite Element Modeling of the Fine-Blanking Process

2004 ◽  
Vol 274-276 ◽  
pp. 727-732
Author(s):  
P.F. Zheng ◽  
Tai Chiu Lee ◽  
Luen Chow Chan
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Fine Blanking ◽  
Element Modeling ◽  
Blanking Process
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