Influence of Press Ram Pulsation on Deep Drawability of Dual Phase Steel Sheet

Olguner, S.; Bozdana, A. Tolga

doi:10.12693/aphyspola.132.742

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…After comparing various friction coefficients and making calculations using DEFORM, they concluded that the quality of circular cup formation decreased in the corners as the friction increased, resulting in thin areas or breakage. Olguner and Bozdana, in 2017, planned three sets of servo motion curves (frequency = 5, 10, and 20 Hz) for circular cup drawing and compared them with a conventional curve [8]. According to results obtained again using DEFORM, the punch force required for drawing decreased as the pulse frequency was increased, and when the motion curve was limited to the drawing of the circular cup, the formability of the circular cup was enhanced, and the chance of breakage was reduced.…”

Section: Strengths Weaknesses Traditional Methodsmentioning

confidence: 99%

Punch Motion Curve in the Extrusion–Drawing Process to Obtain Circular Cups

Chen

Wang

2022

Machines

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Servo press technology is gaining attention because its punch motion curve offers greater formability than that of a conventional stamping press. This study investigated the effect of punch motion curves on the circular cup extrusion–drawing process. Various punch motion curves were analyzed, and the optimal curve for application was determined. Both the extrusion–drawing process and spring back of U-shaped sheet metal were investigated. In the circular cup extrusion–drawing process, the punch motion curve of a conventional stamping press (Case A) and three punch motion curves of a servo press (Cases B–D, the strokes of which differed from that of Case A by 0.5, 1.5, and 2.5 mm, respectively) were compared, particularly regarding the effect of the coefficient of friction on the circular cup extrusion–drawing process. The simulation analysis was performed using the software program DEFORM. A set of simulated parameters were compared with experimental results. The formability, cup shape, cup height, cup thickness, extrusion force–displacement curve, stress distribution, and strain distribution were analyzed for the design of the die required. Additionally, experimental and simulation results were compared to determine the reliability and precision of the DEFORM simulations. The results indicated that the conventional punch motion curve resulted in a shorter cup, greater stress, greater strain, and the need for a greater extrusion force. By contrast, the servo punch motion curves resulted in taller cups, less stress, and less strain. The findings can serve as a reference for the development of servo presses.

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Section: Strengths Weaknesses Traditional Methodsmentioning

confidence: 99%

Punch Motion Curve in the Extrusion–Drawing Process to Obtain Circular Cups

Chen

Wang

2022

Machines

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“…The experimental design method could effectively optimize the pressure distribution required for the forming process of continuously variable pulleys and spur gears. Olguner and Bozdana [19] proposed a finite element model for a dual-phase steel plate to evaluate the reduction of steel plate thickness and the change of forming load in the pulse pressure distribution curve during the drawing process. They also changed the frequency and amplitude of the pulse pressure to perform elastoplastic FEA with DEFORM-3D.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and optimization of fine-blanking process for copper alloy sheet

Kuo

Liu

Li³

et al. 2021

Int J Adv Manuf Technol

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When the fine-blanking process is used, secondary grinding or processing can be omitted because the shear surface of fine-blanking parts can achieve almost zero fracture zone requirements. The primary objective of the fine-blanking process is to reduce the fracture zone depth and die roll zone width. This study used a 2.5-mm-thick central processing unit (CPU) thermal heat spreader as an example. Finite element analysis software was employed to simulate and optimize the main eight process parameters that affect the fracture zone depth and die roll zone width after fine-blanking: the V-ring shape angle, V-ring height of the blank holder, V-ring height of the cavity, V-ring position, blank holder force, counter punch force, die clearance, and blanking velocity. Simulation analysis was conducted using the L18 (21 × 37) Taguchi orthogonal array experimental combination. The simulation results of the fracture zone depth and die roll zone width were optimized and analyzed as quality objectives using Taguchi’s smaller-the-better design. The analysis results revealed that with fracture zone depth as the quality objective, 0.164 mm was the optimal value, and counter punch force made the largest contribution of 25.89%. In addition, with die roll zone width as the quality objective, the optimal value was 1.274 mm, and V-ring height of the cavity made the largest contribution of 29.45%. Subsequently, this study selected fracture zone depth and die roll zone width as multicriteria quality objectives and used the robust multicriteria optimal approach and Pareto-optimal solutions to perform multicriteria optimization analysis. The results met the industry’s fraction zone depth standard (below 12% of blank thickness) and achieved a smaller die roll zone width.

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“…They also stated that the brittleness increased as the strength increased and that not only transverse, but also longitudinal cracks were seen in the DP800 and higher grades of steel. Olguner et al [16] investigated the effect of press ram pulsation amplitudes on the deep drawability of dual phase steel sheet using frequencies of 5, 10, and 20 Hz. They reported that their proposed method had a significant effect both in terms of thickness reduction and drawing force compared to conventional ram presses.…”

Section: Introductionmentioning

confidence: 99%

Investigation of deep drawing of square cups using high-strength DP600 and DP800 sheets

Şen

ÇOLAKOĞLU²,

Taşdemir

2021

International Journal of Automotive Science and Technology

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This study investigated the deep drawing of square cups using high-strength du-al phase DP600 and DP800 sheets via both experimental and finite element meth-ods. The limiting drawing ratio (LDR) and wall thickness distribution were exam-ined. The initial thickness of the materials used in the study was equal to 1-mm. The experiments were carried out at room temperature using both Teflon film and graphite spray lubricants at the same time. In terms of LDR, both experimental and numerical results corresponded with each other. A ratio of 1.97 LDR was reached for the DP600 steel and 1.92 LDR for the DP800. Given that the thick-ness distribution between the experimental and numerical results, an accord of over 90% was noticed. For the DP600 steel, the lowest experimental thickness value was 0.864 mm and the lowest numerical value was 0.87 mm. For the DP800 steel, the lowest experimental thickness value was measured to be 0.89 mm while the lowest numerical value was found to be 0.88 mm. In the conclusion, the pre-sent paper proves that the experimental results in the deep drawing of square cups can be achieved with very satisfying results by using numerical methods.

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Influence of Press Ram Pulsation on Deep Drawability of Dual Phase Steel Sheet

Cited by 9 publications

References 14 publications

Punch Motion Curve in the Extrusion–Drawing Process to Obtain Circular Cups

Punch Motion Curve in the Extrusion–Drawing Process to Obtain Circular Cups

Numerical simulation and optimization of fine-blanking process for copper alloy sheet

Investigation of deep drawing of square cups using high-strength DP600 and DP800 sheets

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