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A method for measuring the thermal geometric parameters of large hot rectangular forgings based on projection feature lines

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Abstract

The online dimensional measurement of large hot forging is an important procedure in the forging process. Because of different production demands, the final geometrical shapes of large forgings are usually different (e.g. cylindrical columns, rectangular prisms). Forgings of different geometric shapes need to be measured along different dimensions. For rectangular forgings, the lengths primarily need to be measured. A generalized measurement system for different geometric shapes of forgings cannot provide the accuracy of measurement systems targeted at measuring a known shape. Based on the characteristics of the rectangular forgings, a thermal dimensional measurement system is proposed in this paper. The localization, rapid extraction of feature points and method for measuring the dimensions of rectangular forgings are presented. The proposed methods can easily and efficiently extract the feature points of the forging. The experiment results show that the method proposed in this paper has the advantages of high precision and high efficiency, which is appropriate for online measurement.

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Acknowledgements

This paper is supported by the Special Funds of the National Natural Science Foundation of China (Grant No. 51227004), the National Natural Science Foundation of China (Grant No. 51375075), the National Basic Research Program of China 973 Project (Grant No. 2014CB046504) and the Science Fund for Creative Research Groups (Grant No. 51321004).

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Authors and Affiliations

  1. School of Mechanical Engineering, Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology, 2 Lingong Road, Dalian, 116024, China

    Jinghao Yang, Wei Liu, Renwei Zhang, Zhenyuan Jia, Fuji Wang & Shijie Li

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  1. Jinghao Yang
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  2. Wei Liu
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  3. Renwei Zhang
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  4. Zhenyuan Jia
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  5. Fuji Wang
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  6. Shijie Li
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Correspondence to Wei Liu.

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Yang, J., Liu, W., Zhang, R. et al. A method for measuring the thermal geometric parameters of large hot rectangular forgings based on projection feature lines. Machine Vision and Applications 29, 467–476 (2018). https://doi.org/10.1007/s00138-017-0900-0

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  • DOI: https://doi.org/10.1007/s00138-017-0900-0

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