scholarly journals Effect on Blank Holding Force on Blank Deformation at Direct and Indirect Hot Deep Drawings of Boron Steel Sheets

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 574 ◽  
Author(s):  
Hyung Yoon Seo ◽  
Chul Kyu Jin ◽  
Chung Gil Kang
Keyword(s):  
Deep Drawing ◽  
Boron Steel ◽  
Drawing Process ◽  
Hot Press ◽  
Deep Drawing Process ◽  
Steel Sheets ◽  
Punch Load ◽  
Blank Holding Force ◽  
Hot Press Process ◽  
Thinning Rate

This study involves performing direct and indirect hot press forming on ultra-high-strength steel (UHSS) boron steel sheets to determine formability. The indirect hot press process is performed as a cold deep drawing process, while the direct hot press process is performed as a hot deep drawing process. The initial blank temperature and the blank holding force are set as parameters to evaluate the performance of the direct and indirect deep drawing processes. The values of punch load and forming depth curve were obtained in the experiment. In addition, the hardness and microstructure of the boron steel sheets are examined to evaluate the mechanical properties of the material. The forming depth, maximum punch load, thickness, and thinning rate according to blank holding force were examined. The result shows that a larger blank holding force has a more significant effect on the variation of the thickness and thinning rate of the samples during the drawing process. Furthermore, the thinning rate of the deep drawing part in with and without fracture boundary was respectively examined.

Effect of the Blank-Holding Load on the Drawing Force in the Deep-Drawing Process of Cylindrical and Square Cups

2015 ◽  
Vol 760 ◽  
pp. 379-384 ◽  
Author(s):  
Lucian Lazarescu ◽  
Ioan Nicodim ◽  
Dan Sorin Comsa ◽  
Dorel Banabic
Keyword(s):  
Aluminum Alloy ◽  
Deep Drawing ◽  
The Other ◽  
Drawing Process ◽  
Drawing Force ◽  
Forming Process ◽  
Deep Drawing Process ◽  
Steel Sheets ◽  
Other Hand ◽  
Blank Holding Force

In this study, the influence of the blank-holding force (BHF) on the drawing force (DF) in the deep-drawing process of cylindrical and square cups has been investigated experimentally. For this purpose, different constant and variable BHFs have been applied to AA6016-T4 aluminum alloy and DC04 steel sheets during the forming process. It has been observed that an increased constant BHF leads to an increase of DF. On the other hand, the variable BHF approach, in which the BHF decreases in six steps throughout the punch stroke, reduces the DF.

The Prediction of Press Loads in Deep Drawing With Various Conditions of Lubrication at Elevated Temperatures

1973 ◽  
Vol 95 (3) ◽  
pp. 895-903 ◽  
Author(s):  
M. H. Pope ◽  
J. T. Berry
Keyword(s):  
Experimental Work ◽  
Work Hardening ◽  
Deep Drawing ◽  
Numerical Evaluation ◽  
Elevated Temperatures ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Punch Load ◽  
Die Profile ◽  
Logical Extension

The present work is introduced and is shown to be a logical extension of work by Chung and Swift, Ray and Berry, et al. The authors introduce the deep drawing process and analyze the stresses due to radial drawing (including friction), bending the sheet, unbending the sheet, and die profile friction. From these stresses, an expression for the total punch load is developed. The authors also describe the experimental work in which determinations are made of the work hardening exponents, the anisotropic coefficients, the friction coefficients, and the total punch load. The paper concludes by comparing the numerical evaluation of the maximum punch load with that determined from experiments.

Investigation on Friction Coefficient Considering Al-Si Coating Layer Fracture of Boron Sheets in Hot and Cold Deep Drawing

2020 ◽  
Vol 846 ◽  
pp. 117-121
Author(s):  
Min Sik Lee ◽  
Jun Park ◽  
J.S.Suresh Babu ◽  
Chung Gil Kang
Keyword(s):  
Friction Coefficient ◽  
Deep Drawing ◽  
Deformation Behavior ◽  
Coating Layer ◽  
Surface Condition ◽  
Forming Limit ◽  
Boron Steel ◽  
Drawing Process ◽  
Forming Process ◽  
Deep Drawing Process

In this paper, hot and cold deep drawing processes are determined with direct deep drawing process and indirect deep drawing process. To predict the friction coefficient, the finite-element method, which can predict deformation behavior until the fracture of a blank sheet, was proposed using the forming limit diagram (FLD) curve. The effect of fracturing of the coating layer on the friction coefficient during the hot and cold deep drawing processes was investigated. The deformation behavior of the coating layer of the boron steel sheet that affects the friction coefficient in the hot and cold deep drawing processes was also proposed. A forming method that can control the surface condition of the formed product is further proposed by explaining the fracture of the coating due to the forming process.

Numerical Simulation and Experimental Research on Superplasticity of Ceramic/Ceramic Laminated Composite

2007 ◽  
Vol 551-552 ◽  
pp. 533-538
Author(s):  
Guo Feng Wang ◽  
D.Z. Wu ◽  
C.W. Wang ◽  
Wen Bo Han
Keyword(s):  
Numerical Simulation ◽  
Deep Drawing ◽  
Tape Casting ◽  
Laminated Composite ◽  
Drawing Process ◽  
Hot Press ◽  
Deep Drawing Process ◽  
Forming Temperature ◽  
Hot Press Sintering ◽  
Better Than

In order to investigate the superplasticity of ceramic/ceramic laminated composite under tensile stress, the superplastic deep-drawing process was simulated by FEM. The results shown that, the strain and stress conditions of laminated composite, made by ceramic with different superplastic formability, are better than that of monolithic ceramic. Consequently, the material may exhibit high superplasticity. To testify this, some experiments were carried out. Tape casting and hot-press sintering are used to fabricate Al2O3/3Y-TZP laminated composite. As-received material is deep-drawing at high temperature to research its superplasticity. The results shown that, when suitable strain rate and forming temperature were used, the as-received material has excellent superplasticity.

Evaluation of Press Formability Using Servo Die Cushion in Deep Drawing

2010 ◽  
Vol 654-656 ◽  
pp. 322-325
Author(s):  
Akihiro Watanabe ◽  
Yuji Kotani ◽  
Hisaki Watari ◽  
Takehiro Shimizu
Keyword(s):  
Working Conditions ◽  
Deep Drawing ◽  
Manufacturing Process ◽  
Maximum Load ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Servo Press ◽  
Blank Holding Force ◽  
Conventional Press ◽  
Press Formability

Manufacturing process using servo press machines have been highlighted in car manufacturers and other industries in Japan. It is necessary to establish an appropriate press working conditions for manufacturing highly accurate products with great extra value. Our aim is to investigate into effects of variable BHF (blank holding force) on press formability, comparing to using a conventional press machine. In this study, FEM analyses of deep drawing process using a variable BHF system has been conducted to demonstrate the effectiveness of a servo die cushion on formability. According to experimental results obtained with a servo die cushion, it is found that maximum load subjected to dies was reduced by 11.8 %, when using a servo press with a servo die cushion comparing to a conventional press.

Texture evolution of monolithic-phase and dual-phase steel sheets during a deep-drawing process

2011 ◽  
Vol 17 (3) ◽  
pp. 403-412 ◽  
Author(s):  
Hoe-Seok Yang ◽  
Baek-Seok Seong ◽  
Seong-Ho Han ◽  
Shi-Hoon Choi
Keyword(s):  
Deep Drawing ◽  
Dual Phase Steel ◽  
Texture Evolution ◽  
Dual Phase ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Steel Sheets

FE simulation study of deep drawing process of SUS304 cups having no delayed cracks under enhanced blank holding force

2019 ◽  
Vol 234 (1-2) ◽  
pp. 84-94 ◽  
Author(s):  
Chin Joo Tan ◽  
Afshin Aslian
Keyword(s):  
Wall Thickness ◽  
Deep Drawing ◽  
Circumferential Stress ◽  
Wall Thickening ◽  
Drawing Process ◽  
High Concentration ◽  
Deep Drawing Process ◽  
Blank Holding Force ◽  
Force Range ◽  
Hoop Stresses

In the experiment, delayed cracks in deep drawing processes of metastable stainless steel SUS304 cylindrical cups were prevented using elevated blank holding force aided by nanolubrication. Besides tensile residual hoop stresses, the elimination of the cracks was also attributed to the change in wall thickening profile along the wavy cup edges. The wall thickening is a result of the high circumferential stress acting in the flange, leading to the high concentration of deformation-induced martensite and high risk of cracks. The amount of increase in wall thickness in the valleys along the edge during the deep drawing process was higher than the peaks at low blank holding force range due to shorter heights. Therefore, the portions of blank equivalent to the valleys were subject to higher holding force during the process, resulting in decrease in degree of wall thickening with increase in height for blank holding force up to 25 kN. However, the wall thickening and the height increased at blank holding force of 28 kN due to the same amount of increase in wall thickness in both valleys and peaks, resulting in a larger contacting area and lower holding force. Therefore, the wall thickness in the valleys sharply increased, and the formation of the cracks persists. Within the crack-free range, that is, from 29 to 31 kN, both the heights and wall thickening decreased. The decrease in frictional force by means of the nanolubrication has facilitated the flow of material into the die, resulting in lower cup height. It also facilitated the flow of materials away from the thick valley regions under the high pressure, resulting in significant decrease in degree of wall thickening. The cracks were prevented. The amount of compression at blank holding force of 32 kN was insufficient to suppress the increase in wall thickening in valleys, resulting in the formation of the cracks again.

scholarly journals Reduction of Springback for Hat Channel with High-Strength Steel Sheets by Stroke-Returning Deep-Drawing Process

2016 ◽  
Vol 57 (660) ◽  
pp. 60-65 ◽  
Author(s):  
Hayato KOMINE ◽  
Masayuki ASAKURA ◽  
Taro GEKA ◽  
Takuma KISO ◽  
Masato TAKAMURA ◽  
...  
Keyword(s):  
Deep Drawing ◽  
High Strength Steel ◽  
High Strength ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Steel Sheets
Sign in / Sign up

Export Citation Format

Share Document