The effect of die/blank holder and punch radiuses on limit drawing ratio in angular deep-drawing dies

Özek, Cebeli; Bal, Muhammet

doi:10.1007/s00170-008-1435-3

Cited by 33 publications

(18 citation statements)

References 11 publications

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“…Here, attention was focused on the first step, drawing, as this step essentially determines the final product shape of the lower arm, and it is during this step that tearing failures appear. The parameters affecting the shaping can be listed as pressure plate force, friction, punch speed and temperature [3]. In addition to these, many factors can affect the metal stamping process, including the mechanical properties of the steel sheet, the friction coefficient, the shape of the die and punch and process variables such as the blank shape.…”

Section: Introductionmentioning

confidence: 99%

Development of car wishbone using sheet metal tearing process via the theory of inventive problem-solving (TRIZ) method

Şen

Baykal²

2019

J Braz. Soc. Mech. Sci. Eng.

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In the automotive industry, sheet metal forming process design is of great importance. The cold forming process in particular is the most widely preferred of these methods. In the production of car parts in complex forms, forming problems such as tearing, wrinkling, back spring and unwanted thinning can appear. Recently, numerical analysis technology and software tools have been widely used in process design and metal forming. Elimination of these problems without the use of analysis programs means the use of the trial and error method, which results in much wasted time and huge costs. In addition to the use of analysis programs, resolving problems without mold process and design knowledge is also problematic. In this study, the theory of inventive problem-solving (TRIZ) approach was utilized to reach an analytical solution. In this methodology, the improving and worsening features were determined and a TRIZ 39 × 39 contradiction matrix was created which led to the solutions. Virtual experiments were carried out on a wishbone mold model designed via the Siemens NX 12 CAD program using the Autoform R7 analysis program. Real environment experiments were then performed, and the problem of tearing during the forming process was eliminated. The measured thickness value of this area, which was formed without tearing, was measured as 2.7 mm in the virtual environment experiments and 2.9 mm in the real environment experiments. In addition, the wishbone was subjected to two-axis (x and z) dynamic testing, with acceptable values reached at 500,000 cycles.

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Section: Introductionmentioning

confidence: 99%

Development of car wishbone using sheet metal tearing process via the theory of inventive problem-solving (TRIZ) method

Şen

Baykal²

2019

J Braz. Soc. Mech. Sci. Eng.

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“…It was found that the LDR in dieless drawing strongly depends on heating temperature. The effect of die/blank holder and punch radius on LDR in angular deep drawing dies was studied by Ozek et al [3]. It was concluded that both the LDR and punch force increased with increasing the die/blank holder and punch radius.…”

Section: Introductionmentioning

confidence: 99%

“…Gau et al [14] designed singles dies for a whole manufacture process in order to obtain products with high LDR with one stage drawing and two stages ironing at high temperatures. The influence of die/blank holder and punch radius on LDR was studied by Ozek and Bal [16], and it was found that the LDR could be effectively improved by increasing the die/blank holder angle.…”

Section: Introductionmentioning

confidence: 99%

Study on micro hydro-mechanical deep drawing using finite element method

Zhao

et al. 2016

MATEC Web Conf.

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Abstract. A numerical model was established to investigate the micro hydro-mechanical deep drawing process of austenitic stainless steel 304 foil (0.05 mm thickness). Due to the miniaturisation of the specimen size, the effect of grain size, gap distance and radial pressure during drawing process could be prominent. The results indicate that the appropriate radial pressure and gap distance could improve the limit drawing ratio (LDR) of manufactured cylindrical cups by reducing the friction resistance. The maximum LDR obtained in the present work reaches 3.2, which is much higher than that obtained by conventional deep drawing process.

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“…al. [6] presented an attempt to predict the influence of various radiuses of die and punch on the limit drawing ratio by using DIN EN 10130-91 sheet metal. Their research indicated that the limit drawing ratio increased with increasing punch radius and die/blank holder angle.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of formability in deep drawing of two-layer metallic sheets

Karajibani

Fazli

Hashemi

2015

Int J Adv Manuf Technol

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In this paper, the formability of two-layer (aluminum-st12 steel) sheets in the deep drawing process was investigated through numerical simulations and experiments. The purpose of this research was to obtain more formability in deep drawing process. The limit drawing ratio (LDR) was obtained in deep drawing of two-layer metallic sheets, with aluminum inner layer which was in contact with the punch and steel outer layer which was in contact with the die. Finite element simulations were performed to study the effect of parameters such as the thickness of each layer, value of die arc radius, friction coefficient between blank and punch, friction coefficient between blank and die, and lay-up on the LDR. Experiments were conducted to verify the finite element simulations. The results indicated that the LDR was dependent on the mentioned parameters, so the LDR and as a result the two-layer metallic sheet formability could be increased by improvement of these parameters in deep drawing process.

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The effect of die/blank holder and punch radiuses on limit drawing ratio in angular deep-drawing dies

Cited by 33 publications

References 11 publications

Development of car wishbone using sheet metal tearing process via the theory of inventive problem-solving (TRIZ) method

Development of car wishbone using sheet metal tearing process via the theory of inventive problem-solving (TRIZ) method

Study on micro hydro-mechanical deep drawing using finite element method

Numerical and experimental study of formability in deep drawing of two-layer metallic sheets

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