Reconfigurable Computing for Tool-Path Computation

Jimeno, Antonio; Cuenca, S.

doi:10.1007/s00170-002-1415-y

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…The tool allows last grading to be automatically performed for more than one size at once, and also allows the selection among different sizing systems and, within them, the choice of gender/age, length and width of the target size. Once the last grading file is obtained, the last can be manufactured using whatever of the existing CAD/CAM approaches [13,14]. This approach did not describe in detail the equations employed to grade the last, but highlighted that the grading is performed proportionally.…”

Section: Shoe Last Grading Techniquesmentioning

confidence: 99%

Automation of the shoe last grading process according to international sizing systems

Hinojo-Pérez

Davia-Aracil

Jimeno-Morenilla

et al. 2015

Int J Adv Manuf Technol

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The last is the basic industrial component in footwear manufacturing, from which product development starts. Correct last grading ensures the best fit for the intended group of users of the footwear model to be produced. The size marked on the last should respect the specific intervals defined in the different international sizing systems, like the European, UK, US or Mondopoint systems, which are all described in international standards. New approaches in the field of CAD/CAM have emerged over recent years towards the automation of this process. However, these are partial approaches that neither address the grading process according to the different standards nor consider the various parts of the shoe that are not affected by size increments. This paper presents a new accurate and efficient technique for the automation of the shoe last grading process based on the conjugate gradient method. Through this method, it is possible to obtain a graded shoe last that conforms to the international standards in force relative to shoe sizing and allows for the shoe parts that are not affected by size increments. This technique is based on the target measures of length and perimeter of the last to be graded, and aims to minimise the quadratic difference between these values and those obtained from the graded last. This method has been evaluated through a battery of tests performed on a geometrically heterogeneous group of shoe lasts. The results obtained were accurate and the execution time was fast enough to be used for mass production.Keywords Footwear manufacturing  Grading  Shoe last  Conjugate gradient  ISO Standards Highlights  This paper presents an accurate and efficient technique for shoe last grading based on the conjugate gradient method.  This paper describes a grading algorithm based on the minimisation of the error obtained from comparing measures between shoe lasts.  This grading technique conforms to ISO standards relative to sizing systems and allows for footwear parts that are not affected by the grading process.  This paper presents a detailed battery of experiments by which the goodness and accuracy of this method were evaluated.

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Section: Shoe Last Grading Techniquesmentioning

confidence: 99%

Automation of the shoe last grading process according to international sizing systems

Hinojo-Pérez

Davia-Aracil

Jimeno-Morenilla

et al. 2015

Int J Adv Manuf Technol

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“…In a previous work [15], we presented a study about the theoretical impact of HW on the VD algorithm using FPGA-based technology. Also a proposal for a hybrid hardware/software (HW/ SW) implementation of the transformation operator used in the VD algorithm can be seen in [16] and preliminary experimental results are shown in [17].…”

Section: Introductionmentioning

confidence: 99%

Hardware approach to tool path computation for STEP-NC enabled CNC: A case study of turning operations

Cuenca

Jimeno-Morenilla

Martínez

et al. 2011

Computers in Industry

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“…A study about the theoretical impact of Reconfigurable Computing on the VD algorithm was performed in [8]. A proposal for hardware implementation of the transformation operator used in the VD algorithm can be seen in [9] with some simulation results.…”

Section: Introductionmentioning

confidence: 99%

A Hardware/Software Architecture for Tool Path Computation. An Application to Turning Lathe Machining

Cuenca

Martínez

Jimeno

et al. 2007

2007 International Conference on Embedded Computer Systems: Architectures, Modeling and Simulation

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Abstract-Tool path generation is one of the most complex problems in Computer Aided Manufacturing. Although some efficient strategies have been developed, most of them are only useful for standard machining. The algorithm called Virtual Digitizing avoids this problem by its own definition but its computing cost is high and makes it difficult for being integrated in standard machining in order to adopt the new ISO standard 14649. Presented in the paper there is a Virtual Digitizing hardware/software architecture that takes advantage of Field Programmable Gate Arrays (FPGAs) to improve the algorithm efficiency and to meet the actual restrictions of the traditional Computer Numeric Control systems at the same time. In order to evaluate the architecture, a prototype was implemented using a commercial reconfigurable platform integrated within a CNC lathe for shoe last machining. The performance of the system for tool path generation was measured for different trajectory and surface precisions using a database of real shoe models. The experiments show a significant speedup for all the cases and maintaining the error of the results below the maximum allowed.

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Reconfigurable Computing for Tool-Path Computation

Cited by 7 publications

References 10 publications

Automation of the shoe last grading process according to international sizing systems

Automation of the shoe last grading process according to international sizing systems

Hardware approach to tool path computation for STEP-NC enabled CNC: A case study of turning operations

A Hardware/Software Architecture for Tool Path Computation. An Application to Turning Lathe Machining

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