A fully automated nesting and piloting system for progressive dies

Ghatrehnaby, M.; Arezoo, Behrooz

doi:10.1016/j.jmatprotec.2008.02.049

Cited by 21 publications

(12 citation statements)

References 9 publications

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“…In this system, noncircular holes of the work-piece and the scrap area of the strip were geometrically analyzed for semi-direct and indirect piloting, respectively. For nesting, they used a copy of the part and position it on the side original part; then, they used an incremental algorithm to transfer the copy of part until the first intersection appears [13]. Their system cannot define the best position for pilot center, and this work is done by the user.…”

Section: Related Workmentioning

confidence: 99%

“…The best angle of nesting is 45°, and the scrap percentage in this angle is 42.1 %. Figure 19 shows the To find the best nesting angle based on the minimum scrap strategy, this result is compared with the software presented in recent studies by Ghatrehnaby and Arezoo [13], and the proposed system has extensive advantages that lead to time optimization. Also, the presented system is more flexible than their system to developing for other type of curves such as elliptical and parabolic curves.…”

Section: The Best Semi-direct Piloting System Selectionmentioning

confidence: 99%

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Development of a new method to automatic nesting and piloting system design for progressive die

Moghaddam

Farsi

Anoushe

2014

Int J Adv Manuf Technol

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Over the last few decades, sheet metal parts have had a number of applications in the industry. The most important and most used type of the dies to production these parts is progressive dies. Computer-aided design of these dies consists of a considerable number of sections. The two most important types of these sections are nesting and piloting. Finding the best nesting plays an important role in the final cost of production and for an accurate strip positioning, the appropriate piloting system is required. In this paper, a new method for curve recognition by dividing part's element into component points is presented for finding the best nesting and piloting state. Curve recognition data and the algorithms for finding the best nesting and piloting system were obtained just by using algebraic equations. This method leads to a decrease in the time of design. The best nesting for all parts that includes line and circular arc will be obtained with the high precision. The semi-direct and indirect pilot hole centers and its diameter will be obtained by defining four matrixes. This system is written in visual basic programming language in the SOLIDWORKS 2010 software. Finally, to compare the system's results to similar system, the nesting and piloting systems for the number of samples are analyzed.

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Section: Related Workmentioning

confidence: 99%

Section: The Best Semi-direct Piloting System Selectionmentioning

confidence: 99%

Development of a new method to automatic nesting and piloting system design for progressive die

Moghaddam

Farsi

Anoushe

2014

Int J Adv Manuf Technol

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“…Zhibing et al (2008) developed a multi-step unfolding method (MSUM) for blank design and formability prediction of complicated progressive die stamping part to assist the process design. Ghatrehnaby and Arezoo (2009) developed an approximate algorithm for automatic piloting and nesting in progressive dies. They also presented an approach based on medial axis transform for automatic piloting in progressive dies (Ghatrehnaby and Arezoo 2010).…”

Section: Previous Studiesmentioning

confidence: 99%

Automatic strip layout design in progressive dies

Ghatrehnaby

Arezoo

2010

J Intell Manuf

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Nowadays, progressive dies have a special role in various methods of sheet metal production. The design process, however requires a considerable amount of time and expertise. Strip layout design is a key step in progressive die design, therefore automating strip layout has a vital role in Computer Aided Progressive Die Design (CAPDD). In this paper, a mathematical model, based on set theory, is introduced to analyze the problem of strip layout. The model describes the mathematical nature of the strip layout problem and reveals the reason why researchers have always faced problems in optimizing strip layout automatically. Using the model presented, an algorithm is developed to optimize strip layout using the minimum number of stations and the torque equilibrium criteria. A prototype software is also developed to automate strip layout design based on the presented algorithm. The suitability of the model is then demonstrated through industrial examples.

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“…The last three statements, in particular, pose a challenge for finding the proper position in a noncircular hole or the scrap area of the strip which satisfies the mentioned considerations. In their previous work, the authors developed an algorithm based on an iterative method to find the best position for semi-direct and indirect pilots [9]. Since the proposed algorithm is based on an iterative method, it results in approximate solutions.…”

Section: Piloting In Progressive Diesmentioning

confidence: 99%

“…Although there are useful rules of thumb for selecting direct pilots in their system, indirect pilots and semi-direct pilots are not addressed. Ghatrehnaby and Arezoo developed an integrated piloting system for progressive dies [9]. The system presented was capable of selecting the most appropriate direct pilots as well as indirect and semi-direct pilots.…”

Section: Introductionmentioning

confidence: 99%

New mathematical approach for automatic piloting in computer aided progressive die design

Ghatrehnaby

Arezoo

2010

Proceedings of the Institution of Mechanical Engineers, Part B:

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Nowadays, progressive dies have a special role in various methods of sheet metal production. The design process, however, requires a considerable amount of time and expertise. During the last three decades, different concepts of computer aided progressive die design (CAPDD) have been studied all around the world. CAPDD includes various activities and among them piloting has been paid the least attention by researchers. In this paper, a mathematical model, based on the medial axis transform is introduced. This model analyses the part geometry in order to determine the piloting system. The model optimizes the piloting system using a minimum scrap strategy and other technical considerations. A program is also developed to automatically select the most suitable existing holes or design auxiliary holes on the scrap part of the strip for piloting purposes. The input to the program is the nesting template of the workpiece, which is composed of line and arc segments, and the output is the piloting system. The model is demonstrated through several industrial examples.

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A fully automated nesting and piloting system for progressive dies

Cited by 21 publications

References 9 publications

Development of a new method to automatic nesting and piloting system design for progressive die

Development of a new method to automatic nesting and piloting system design for progressive die

Automatic strip layout design in progressive dies

New mathematical approach for automatic piloting in computer aided progressive die design

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