scholarly journals Avaliação das condições tribológicas em estampagem de chapas através do ensaio de dobramento sob tensão

2017 ◽  
Vol 22 (2) ◽  
Author(s):  
Luis Fernando Folle ◽  
Lirio Schaeffer
Keyword(s):  
Deep Drawing ◽  
Drawing Test ◽  
Deep Drawing Test

RESUMO A lubrificação em estampagem de peças tem um papel importante no processo de produção, auxiliando na redução do enrugamento, fratura prematura e afinamentos muito localizados da espessura da chapa. Para tal, o lubrificante deve ser capaz de reduzir o atrito a níveis baixos mas não tão baixos a ponto de promover outros tipos de defeitos como o enrugamento da chapa. Uma boa lubrificação também reduz o desgaste prematuro das ferramentas de estampagem que são utilizadas para produção de peças, assim como é essencial para se ter sucesso no processo desenvolvimento de novas peças. Neste trabalho, 4 condições de lubrificações foram avaliadas (3 lubrificantes líquidos e a ausência de lubrificantes) através do ensaio DST (Dobramento Sob Tensão) e ensaio Swift (deep drawing test). A atuação benéfica (redução do atrito) ao processo de estampagem, dos lubrificantes, foi testada através da medição da força máxima de embutimento no ensaio Swift, da força em cada lado da chapa, torque e força vertical no pino do ensaio DST. O material de estudo foi o alumínio comercialmente puro AA1100. As conclusões indicam que o lubrificante que minimiza o atrito sempre fica evidente, não importando o tipo do ensaio a que a chapa foi submetida, porém a medição do torque facilita a identificação do mesmo. É observado também que a medição da força vertical gerada no pino é menor quanto mais ineficiente for o lubrificante.

Cazacu and Barlat Criterion Identification Using the Cylindrical Cup Deep Drawing Test and the Coupled Artificial Neural Networks – Genetic Algorithm Method

2012 ◽  
Vol 504-506 ◽  
pp. 637-642 ◽  
Author(s):  
Hamdi Aguir ◽  
J.L. Alves ◽  
M.C. Oliveira ◽  
L.F. Menezes ◽  
Hedi BelHadjSalah
Keyword(s):  
Genetic Algorithm ◽  
Finite Element ◽  
Deep Drawing ◽  
Inverse Analysis ◽  
Computational Time ◽  
Ann Model ◽  
Drawing Test ◽  
Artificial Neural ◽  
Deep Drawing Test ◽  
Cylindrical Cup

This paper deals with the identification of the anisotropic parameters using an inverse strategy. In the classical inverse methods, the inverse analysis is generally coupled with a finite element code, which leads to a long computational time. In this work an inverse analysis strategy coupled with an artificial neural network (ANN) model is proposed. This method has the advantage of being faster than the classical one. To test and validate the proposed approach an experimental cylindrical cup deep drawing test is used in order to identify the orthotropic material behaviour. The ANN model is trained by finite element simulations of this experimental test. To reduce the gap between the experimental responses and the numerical ones, the proposed method is coupled with an optimization procedure based on the genetic algorithm (GA) to identify the Cazacu and Barlat’2001 material parameters of a standard mild steel DC06.

Evaluation of stamping lubricants using the deep drawing test

2007 ◽  
Vol 47 (14) ◽  
pp. 2120-2132 ◽  
Author(s):  
Hyunok Kim ◽  
Ji Hyun Sung ◽  
Rajesh Sivakumar ◽  
Taylan Altan
Keyword(s):  
Deep Drawing ◽  
Drawing Test ◽  
Deep Drawing Test

Improvement in Material Flow During Non-Isothermal Warm Deep Drawing of Non-Heat Treatable Aluminum Alloy Sheets

2016 ◽  
Author(s):  
Sudhy S. Panicker ◽  
Sushanta Kumar Panda
Keyword(s):  
Aluminum Alloy ◽  
Temperature Gradient ◽  
Deep Drawing ◽  
Material Flow ◽  
Element Model ◽  
Alloy Sheet ◽  
Effect Of Temperature ◽  
Drawing Test ◽  
Warm Deep Drawing ◽  
Deep Drawing Test

Automotive industries are very much interested in implementing warm forming technology for fabrication of light weight auto-body panels using aluminum alloys without localized thinning or splitting. A non-heat treatable and low formable AA5754-H22 aluminum alloy sheet was selected in the present work, and a laboratory scale warm deep drawing test set-up and process sequences were designed to improve material flow through independent heating of punch and dies. Significant enhancement in cup depth was observed when the temperature of punch and dies were set to 30°C and 200°C respectively. Thermo-mechanical finite element model of the non-isothermal deep drawing test was developed successfully to study the improvement in material flow incorporating Barlat-89 yield theory using temperature dependent anisotropy coefficients and Cowper-Symonds hardening model of AA5754-H22 material. It was found that a non-isothermal temperature gradient of approximately 93°C was established within the blank from the center to flange at the start of deformation, and subsequent evolution of temperature gradient helped in improving material flow into the die cavity. The effect of temperature gradient on forming behavior in terms of cup height, ear profile and thinning development across flange, cup wall, and blank center were predicted and validated with experimental results.

scholarly journals Deep Drawing Test of Vinyl Polymers and Copolymers

1971 ◽  
Vol 28 (319) ◽  
pp. 893-897,941
Author(s):  
Katsuhiro Maeda ◽  
Akira Kobayashi
Keyword(s):  
Deep Drawing ◽  
Vinyl Polymers ◽  
Drawing Test ◽  
Deep Drawing Test

Development of Metal Sheets Hydraulic Deep Drawing Tooling

2013 ◽  
Vol 706-708 ◽  
pp. 1286-1289
Author(s):  
Xian Chang Mao ◽  
Si Li
Keyword(s):  
Deep Drawing ◽  
Hydraulic System ◽  
Hydraulic Control ◽  
Blank Holder ◽  
Single Action ◽  
Drawing Test ◽  
Metal Sheets ◽  
Deep Drawing Test ◽  
Hydraulic Control System ◽  
Oriented System

A simple and practical hydraulic deep drawing test tooling is developed to investigate metal sheets formability. It is composed of two parts including the forming die and hydraulic control system. Experiments with varied material and dimensional sheets of hydraulic deep drawing and mechanical deep drawing can be fulfilled by the tooling on a Single-Action Press without complicate external hydraulic system, blank holder system and oriented system for punch, respectively. The tooling is testified to be simply, facile and reliable, which can perfectly perform the sheets forming in hydraulic deep drawing, and the formability of sheets was improved effectively with hydraulic deep drawing.

Measurement of Coefficient of Friction in Hot Stamping by Hot Deep Drawing Test

2016 ◽  
Vol 716 ◽  
pp. 184-189
Author(s):  
Hironori Sasaki ◽  
Tomonori Mukai ◽  
Akira Yanagida
Keyword(s):  
Coefficient Of Friction ◽  
Deep Drawing ◽  
Hot Stamping ◽  
High Strength ◽  
Local Deformation ◽  
Wall Area ◽  
Scale Thickness ◽  
Drawing Test ◽  
The Coefficient Of Friction ◽  
Deep Drawing Test

Hot stamping process has been developed to produce the steel automobile parts with an ultra-high-strength of 1500 MPa. The effect of scale thickness on the formability in hot stamping was investigated by a hot deep drawing test in our previous research. The draw-in lengths of flange increased with decreasing the scale thickness. It is supposed that thin scale thickness resulted in low coefficient of friction at the flange area. The other reason is the temperature of wall zone would become low according to decreasing the scale thickness or increasing of the thermal transfer coefficient and it slightly inhibits local deformation at the wall area. It is difficult to separate these phenomena. To quantify the effect of scale thickness on the friction at the flange area during hot deep drawing, the coefficient of friction was directly measured. The coefficient of friction decreases with decreasing scale thickness.

A Same Area Method Used to Calculate the Strain in Forming for an Axisymmetric Workpiece

2014 ◽  
Vol 936 ◽  
pp. 1609-1613
Author(s):  
Zhi Ren Han ◽  
Qiang Xu ◽  
Ze Bing Yuan
Keyword(s):  
Experimental Study ◽  
Deep Drawing ◽  
Reduction Rate ◽  
Forming Process ◽  
Area Method ◽  
Strain Calculation ◽  
Drawing Die ◽  
Drawing Test ◽  
Deep Drawing Test ◽  
The Ideal

An experimental study is conducted to explore a new method to calculate the strain in axisymmetric workpiece forming. When designing deep drawing die for an axisymmetric workpiece, the principal strain during the forming is needed to estimate formability and to decide whether the forming is finished in one pass. Strain calculation is a difficult task, so an ideal same area method used to calculate the strain for an axisymmetric workpiece along with a correction same area method considered thickness reduction rate is proposed here. The deep drawing test for an axisymmetric workpiece is used to obtain the strain along circumference and generatrix direction. The strain along the two directions calculated by the ideal same area method and correction same area method is compared with experimental results. The results show that ideal same area method can be used to calculate the strain during the forming process for an axisymmetric workpiece and the result from correction same area method is close to the experiment.

scholarly journals Analysis of Square Shell Deep Drawing Test of Ti–3Al–2.5V Sheet

2011 ◽  
Vol 97 (7) ◽  
pp. 382-387
Author(s):  
Tetsuro Ohwue ◽  
Arata Saito ◽  
Kazuhiro Takahashi ◽  
Hideki Fujii ◽  
Kohsaku Ushioda
Keyword(s):  
Deep Drawing ◽  
Drawing Test ◽  
Deep Drawing Test

scholarly journals Analysis of Earring in Circular-Shell Deep-Drawing Test

2013 ◽  
Vol 79 (801) ◽  
pp. 595-608 ◽  
Author(s):  
Tetsuro OHWUE ◽  
Kazuki SATO ◽  
Yoshikazu KOBAYASHI
Keyword(s):  
Deep Drawing ◽  
Drawing Test ◽  
Deep Drawing Test ◽  
Circular Shell

Mechanical Property of Roll Cast Al-11%Si Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 461-466
Author(s):  
Toshio Haga
Keyword(s):  
Deep Drawing ◽  
High Speed ◽  
Bending Test ◽  
Drawing Ratio ◽  
Drawing Test ◽  
Fe Content ◽  
Eutectic Si ◽  
Twin Roll Caster ◽  
Deep Drawing Test ◽  
Twin Roll

Al-11%Si (-0.44%Fe-0.16%Cu-0.14%Mg) was cast into the strip using a vertical type high speed twin roll caster at speed of 60m/min. Cooling rate of the strip was ranging from 2000OC/s at surface to 1000OC/s at center of thickness. The eutectic Si was smaller than 2μm. The homogenization, cold rolling down to 1mm, and annealing were carried out before the tension test, 180 degrees bending test and deep drawing test. Tensile stress was 192MPa, 0.2%proof stress was 84MPa, and elongation was 23.8%. Roll cast Al-11%Si had excellent elongation. The specimen was not broken by the 180 degree bending. LDR (Limiting Drawing Ratio) of the deep drawing test was 1.8. The ductility was drastically improved by the high speed twin roll caster. These results show that roll cast Al-11%Si has ability to be used for sheet forming. Moreover, Fe was increased up to 1.0% as the model of recycled alloy. The elongation was 15.9% and LDR was 1.7 in the condition that Fe content was 1.0%. Al-Si-Fe intermetallic became fine by the effect of rapid solidification. As the result, deterioration of the ductility was improved.

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