对反向深拉工艺生产无坯料夹持方形黄铜杯的评估

IF 1.9 4区 工程技术 Q2 Engineering
Ali Hassan Saleh, Hussein Muwafaq Abdulridha, Rawaa Hamid Mohammed Al-Kalali, Muammar Ibrahim Ismail
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引用次数: 0

摘要

深拉伸是将金属板坯料拉伸成所需形状的工艺。使用坯料夹具是为了防止产品起皱,尤其是薄板。实施这一工艺需要使用双动压力机,如果取消坯料夹具,则可以使用单动压力机,从而节省能源。在本次研究中,我们采用了一种新的冲头和模具布置方式,在没有坯料夹具的情况下,通过一次反向拉深冲程从薄板上生产出黄铜方杯。用空心方形冲头将坯料推过带有方形内模的方形外模,即可生产出方形杯。坯料的几何形状及其尺寸会影响皱纹的确定、拉伸载荷以及应变和厚度的分布,此外还会减少产品切边过程中的金属废料。为了通过数值和实验研究该参数的影响,我们采用了三种形状的坯料:正方形、四角带圆角的正方形和圆形坯料。结果表明,方形坯料能成功制作出棱长 30 毫米、高 20 毫米、半径 4 毫米的方形杯,且没有起皱。所有坯料的最大载荷和厚度分布几乎相似,但底座厚度出现了明显变化。方形坯料的最大应变值减小。冲头的速度会影响拉伸载荷的确定,因此实验采用了三种冲头速度(3、6 和 9 毫米/分钟)来研究它们对载荷的影响。结果表明,6 毫米/分钟的速度最佳。数值结果与实验结果之间的误差不超过 10%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluation of the Reverse Deep Drawing Process to Produce Square Cup of Brass Without Blank-Holder

Evaluation of the Reverse Deep Drawing Process to Produce Square Cup of Brass Without Blank-Holder

Deep drawing is the process of drawing sheet metal blank into a desired shape. A blank holder is used to prevent wrinkling in the product, especially with thin sheets. The implementation of this process requires the use of double action press, and when the blank-holder is eliminated, single action press can be used, thus saving energy. In the current study, a new arrangement of punch and die was adopted to produce a square cup of brass from thin sheet in a single stroke of reverse deep drawing without blank-holder. Square cup produced by pushing blank with a hollow square punch through a square outer die which has inner square die. The geometric shape of the blank and its dimensions can affect the determination of the wrinkling as well as the drawing load and the distribution of strain and thickness, in addition reducing the metal removed as a waste in the trimming process of product. To study the effect of this parameter numerically and experimentally, three shapes were employed, square, square with fillet at its corners, and circular blank. The results show that the square blank gave a successful square cup of 30 mm rib, and 20 mm height has 4 mm radius without wrinkling. The maximum load and thickness distribution were almost similar for all blanks and an apparent change appeared in the thickness of the base. The maximum strain value decreases in the square blank. The speed of the punch can affect the determination of the drawing load, so three punch speeds (3, 6 and 9 mm/min) were experimentally employed to investigate their effect on load. The results revealed that the speed of 6 mm/min was the best. Errors between numerical and experimental results don’t exceed 10%.

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来源期刊
CiteScore
4.10
自引率
10.50%
发文量
115
审稿时长
3-6 weeks
期刊介绍: The International Journal of Precision Engineering and Manufacturing accepts original contributions on all aspects of precision engineering and manufacturing. The journal specific focus areas include, but are not limited to: - Precision Machining Processes - Manufacturing Systems - Robotics and Automation - Machine Tools - Design and Materials - Biomechanical Engineering - Nano/Micro Technology - Rapid Prototyping and Manufacturing - Measurements and Control Surveys and reviews will also be planned in consultation with the Editorial Board.
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