Advances in the Control of Sheet Metal Forming

Lim, Yongseob; Venugopal, Ravinder; Ulsoy, A. Galip

doi:10.3182/20080706-5-kr-1001.00320

Cited by 17 publications

(18 citation statements)

References 35 publications

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“…Modelling the control system Lim et al [7] reviewed advances in feedback control of sheet metal forming processes and concluded that one of the requirement for designing and developing in-process-controllers are accurate models of the forming process.…”

Section: Numerical Examplementioning

confidence: 99%

Numerical Comparison of Three Different Feedback Control Schemes Applied on a Forming Operation

Endelt

2018

AMM

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Feedback and process control of metalforming processes has received increasing attention the lastdecade. Basically there exist four control philosophies; control ofprocess parameters during the punch stroke, iterative learning control(based on historical data), a combination iterative learning andfeedback control and finally feed-forward control. The present work willpresent three different control schemes which all are based onfeedback philosophy i.e. control during the punch stroke or iterativelearning control, where process parameters are updated according toprocess history. The three control schemes are tested using a non-linear finite element model of a square deep-drawing and finallypros and cons are discussed based on the numerical results.

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Section: Numerical Examplementioning

confidence: 99%

Numerical Comparison of Three Different Feedback Control Schemes Applied on a Forming Operation

Endelt

2018

AMM

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“…Process planners and tool designers must determine the level of formability required for each workpiece to be stamped ( Kumar 2002). The identification of regions of stretching, deep drawing and plane strain during forming can contribute to improve the forming process technology and tool geometry optimization (Buchar 1996) or control of process parameters (Lim, Ulsoy 2008, 2010. FLCs are used as an indication of the formability of a certain material.…”

Section: Formability Testmentioning

confidence: 99%

Factors that Affect the Quality of Inputs in Manufacturing Organisations: A Case Study of Nampak Kenya Limited

Maina¹,

Bwisa²

2014

IJARBSS

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Supplier selection, Supply base reduction and supplier development among other factors plays a vital role in ensuring that manufacturing organizations get an acceptable quality of inputs from their suppliers. The purpose of this study is to carry out a research on how the above factors affect the quality of inputs in manufacturing organizations in Kenya. Studies carried out by previous researchers showed that manufacturing organizations lose a lot of money and time patching up issue brought about by poor quality of inputs which leads to scrap, rework and repair, trouble shooting, concessions, and downgrading and even losing future job opportunities.The research was carried out in Nampak Kenya Limited which is a food packaging company with both local and international suppliers of its raw materials. A questionnaire, interview guide and observation guide were all used to collect the data. A response rate of 92% was obtained. Based on the research findings 89% of the respondents indicated that supplier selection criterion affected the quality of input in manufacturing organizations.83.9% held it that supply base reduction greatly affects the quality of inputs and 61% said that supplier development greatly affects the quality of inputs in manufacturing organizations. The study concluded that manufacturing organizations in Kenya need to improve on their supplier selection criterion, reduce their supply base and also need to develop their suppliers rather than getting new ones all the time.

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“…With this system, retrogressive, constant, and progressive blank holding force trajectories were pre-determined using special software. Today, modern drawing presses have hydraulic blank holders that are usually installed in the press table as die cushions that build up the BHF through the blank holders [6][7][8][9]. Hydraulic cushions with proportional or servo valves that are used to achieve accuracy in BHF control in press systems have proven to be effective.…”

Section: Introductionmentioning

confidence: 99%

A study of the control of the blank holding force using an MR damper in a drawing press

2010

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The predominant failure modes (wrinkling and tearing) must be avoided during the drawing process in sheet metal forming. These defects may be eliminated by using a controllable device for which the blank holding force (BHF) is adjustable. The purpose of this research is to verify the possibility of using a magneto-rheological (MR) damper for obtaining an almost constant BHF in drawing presses. The damper force is controlled by adjusting the current that is applied to the MR fluid, which is a functional material. To realize this aim, a prototypical press system is manufactured. A control test using a closed-loop PID controller is carried out for achieving the objective where by a constant BHF is retained at a constant prescribed force, while the press slide translates at a constant velocity. The results show that the BHF of the drawing press can be controlled effectively by using the proposed MR damper.

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Advances in the Control of Sheet Metal Forming

Cited by 17 publications

References 35 publications

Numerical Comparison of Three Different Feedback Control Schemes Applied on a Forming Operation

Numerical Comparison of Three Different Feedback Control Schemes Applied on a Forming Operation

Factors that Affect the Quality of Inputs in Manufacturing Organisations: A Case Study of Nampak Kenya Limited

A study of the control of the blank holding force using an MR damper in a drawing press

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