Automatic piloting in progressive dies using medial axis transform

Ghatrehnaby, M.; Arezoo, Behrooz

doi:10.1016/j.apm.2010.01.007

Cited by 7 publications

(6 citation statements)

References 35 publications

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“…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). Ingarao and Lorenzo (2010) presented a computer aided approach aiming to deal with the problem of springback control for complex shapes in a multi-objective problem context.…”

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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Section: Previous Studiesmentioning

confidence: 99%

Automatic strip layout design in progressive dies

Ghatrehnaby

Arezoo

2010

J Intell Manuf

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“…The concept of the medial axis was first proposed in 1967 by Blum to describe graphics (Blum, 1967). Afterward, medial axis extraction has been used in feature recognition (Kao et al, 2008), robot motion planning (Ghatrehnaby and Arezoo, 2010), image recognition (Tian et al, 2015), biometric shape analysis (Pouch et al, 2015), mesh generation (Quadros, 2016) and cavity machining path generation (Hornus and Lefebvre, 2017).…”

Section: Medial Axis Extractionmentioning

confidence: 99%

An improved medial axis path generation algorithm for selective laser melting

Zhang

Ding

Ullah

et al. 2020

RPJ

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Purpose The principle of the medial axis calculation is complicated and difficult to implement. Moreover, the accuracy is not high. Then, as the generated path has an endpoint at the boundary of the polygon, burrs may appear on the surface of the molded piece. This paper aims to improve the warpage deformation of SLM molded parts and the surface quality of molded parts, an improved mid-axis path generation algorithm is proposed. Design/methodology/approach First, the center point is calculated by the seed point growth method based on the distance transform, and the obtained medial axis has high precision and is suitable for simple polygons and complex polygons. Then, based on the extracted medial axis, a preliminary path is generated, the path is trimmed with MATLAB to remove the redundant path. Finally, a scan along the contour of the polygon is performed to improve the surface quality of the molded part. Findings The algorithm reduces the internal stress generated during the molding process by continuously changing the scanning direction of the path along the boundary curve of the scanning area, thereby reducing the amount of warpage of the molded part. The result of extraction has a higher precision and wider scope of application than other methods to extract central axis, such as the Voronoi diagram-based method. The path is trimmed to remove redundant paths and the polygon boundaries are scanned to further improve the surface quality of the molded part. The results show that warpage deformation of the proposed algorithm is significantly smaller than the other two methods, thus the forming precision is higher. Originality/value An improved medial axis path generation algorithm is proposed in this paper. The proposed method is applied to improve warpage deformation occurring in the SLM process. Seed point growth of distance transformation is used to extracted central axis. The result of extraction has a higher precision and wider scope of application than other methods to extract central axis, such as the Voronoi diagram-based method.

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“…Ghatrehnaby and Arezoo developed a mathematical model which analyzes noncircular holes of a work-piece in order to assess possible semi-direct pilots. The model is also capable of analyzing the scrap area of the strip to determine indirect pilots in an appropriate position using minimum scrap strategy [14]. This system can find the piloting zone, and the best position of pilots is ignored.…”

Section: Related Workmentioning

confidence: 99%

“…Ghatrehnaby and Arezoo [14] introduced a system based on medial axis transform to find the best piloting situation. Their results are similar to the Fig.…”

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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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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Automatic piloting in progressive dies using medial axis transform

Cited by 7 publications

References 35 publications

Automatic strip layout design in progressive dies

Automatic strip layout design in progressive dies

An improved medial axis path generation algorithm for selective laser melting

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

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