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Journal ArticleDOI

Dynamic analysis of two types of over-crank guillotine shears—a comparative study

TL;DR: In this article, two models of guillotine shearing machines, one with the drive shaft parallel to the blade and the other with a drive shaft perpendicular to it, are considered.
About: This article is published in Journal of Materials Processing Technology.The article was published on 1998-11-01. It has received 2 citations till now. The article focuses on the topics: Drive shaft & Shearing (manufacturing).
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Journal ArticleDOI
TL;DR: In this article, the authors used finite element software with an explicit solver to analyze the behavior of a guillotine shearing machine for metal sheet processing and found that excessive clearance overloads the machine considerably compared to normal clearance, owing to considerable lateral forces.
Abstract: Guillotine shearing machines for metal sheet may be inadvertently operated at increased blade clearance. Typical cases were studied using commercially available finite element software with an explicit solver. Loads causing elastic deformation to the machine structure arise from plastic deformation of the sheet metal being processed, its behavior being modelled by modified Johnson-Cook law. Excessive clearance was found to overload the machine considerably compared to normal clearance, owing to considerable lateral forces. As a result, the guillotine and much less so the base of the machine, undergo oscillatory deformation and the sheet is partly sheared and mostly bent. Such analysis helps the designer understand structural issues of the machine tool in extreme situations and modify the design appropriately.

4 citations


Cites result from "Dynamic analysis of two types of ov..."

  • ...The guillotine’s vibration is noticeable, similar finds having been reported in earlier experimental work [10], [27]....

    [...]

Journal ArticleDOI
TL;DR: In this article, the authors describe the problems faced by the steel industry as well as the necessary steps which should be taken for improvement of the productivity of STS machine and also it has made contribution to Bhilai Steel Plant by its growth and prosperity.
Abstract: Article history: Received 6 October, 2015 Accepted 23 April 2016 Available online 24 April 2016 Double-sided trimming shear machine is used for longitudinal both–sided trimming of steel plates and simultaneous scraping of trimmed edges at specific length. Side trimming shear (STS) executes the most vital role in increasing the productivity of plate mill and due to its feature, efficiency of plate mill division is enormously increases. In general, frequency of the occurrence of breakdown in STS machine is a most challenging task when STS performs side trimming and scrap cutting machining process. Bhilai Steel Plant (Steel Authority of India at Bhilai) in India is continuously facing a problem due to breakdown of STS machine. The use of separate knife for side trimming and scrap cutting reduces the possibility of scrap jamming which is a major reason for breakdown of STS machine. Researchers and practitioners also suggest the use of arc guillotine shear for side trimming and straight guillotine shear for scrap cutting for minimizing the breakdown in STS machine. The aim of this study is to describe the problems faced by the steel industry as well as the necessary steps which should be taken for improvement of the productivity of STS machine and also it has made contribution to Bhilai Steel Plant by its growth and prosperity. The methodology of study is purely qualitative and the results point out the problems, its implications, steps taken to improve the overall productivity of Bhilai steel plant. © 2016 Growing Science Ltd. All rights reserved.

4 citations


Cites methods from "Dynamic analysis of two types of ov..."

  • ...Ramamurti et al. (1998) presented two baisc model of guillotine shearing machines, first model based on the conceptual design with the drive shaft paraller to the blade and the other is perpendicular to the blade....

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References
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Book
01 Jan 1971
TL;DR: In this paper, the authors describe how people search numerous times for their favorite books like this the finite element method in engineering science, but end up in malicious downloads, and instead they cope with some infectious bugs inside their computer.
Abstract: Thank you very much for downloading the finite element method in engineering science. Maybe you have knowledge that, people have search numerous times for their favorite books like this the finite element method in engineering science, but end up in malicious downloads. Rather than enjoying a good book with a cup of tea in the afternoon, instead they cope with some infectious bugs inside their computer.

3,688 citations

Journal ArticleDOI
TL;DR: In this article, an experimental investigation carried out on square and rectangular plates with various boundary conditions to determine the damping ratios for a few modes of vibration is reported, based on the experimental findings, the Rayleigh damping coefficients can be computed for subsequent use in the modal superposition technique.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the fabricated stands of a three-roll heavy duty plate bending machine under load have been studied and a parametric study has been performed on them and the results showed that the performance of the machine stands in relation to various design- or structural-modification and arrive at a satisfactory design.

8 citations

Journal ArticleDOI
TL;DR: In this paper, the fabricated stands, bed and ram of a medium tonnage mechanical press brake under load are studied. The results show that the stands, the bed and the ram are capable of handling a variety of bending operations on sheets of up to 6.5 mm thickness.

5 citations

Journal ArticleDOI
TL;DR: In this article, the major components of guillotine shears, including the side stands, bottom connecting plate, the hold-down, top connecting plate and the blade carrier, are examined critically for rigidity and strength, vibration characteristics, dynamic stresses and factor of safety whilst the shear is in operation.

5 citations