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Design and accuracy analysis of a metamorphic CNC flame cutting machine for ship manufacturing

  • Advanced Manufacturing and Machining Technology
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Abstract

The current research of processing large size fabrication holes on complex spatial curved surface mainly focuses on the CNC flame cutting machines design for ship hull of ship manufacturing. However, the existing machines cannot meet the continuous cutting requirements with variable pass conditions through their fixed configuration, and cannot realize high-precision processing as the accuracy theory is not studied adequately. This paper deals with structure design and accuracy prediction technology of novel machine tools for solving the problem of continuous and high-precision cutting. The needed variable trajectory and variable pose kinematic characteristics of non-contact cutting tool are figured out and a metamorphic CNC flame cutting machine designed through metamorphic principle is presented. To analyze kinematic accuracy of the machine, models of joint clearances, manufacturing tolerances and errors in the input variables and error models considering the combined effects are derived based on screw theory after establishing ideal kinematic models. Numerical simulations, processing experiment and trajectory tracking experiment are conducted relative to an eccentric hole with bevels on cylindrical surface respectively. The results of cutting pass contour and kinematic error interval which the position error is from–0.975 mm to +0.628 mm and orientation error is from–0.01 rad to +0.01 rad indicate that the developed machine can complete cutting process continuously and effectively, and the established kinematic error models are effective although the interval is within a ‘large’ range. It also shows the matching property between metamorphic principle and variable working tasks, and the mapping correlation between original designing parameters and kinematic errors of machines. This research develops a metamorphic CNC flame cutting machine and establishes kinematic error models for accuracy analysis of machine tools.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin, 150001, China

    Shenghai Hu, Manhui Zhang, Baoping Zhang, Xi Chen & Wei Yu

Authors
  1. Shenghai Hu
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  2. Manhui Zhang
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  3. Baoping Zhang
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  4. Xi Chen
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  5. Wei Yu
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Corresponding author

Correspondence to Manhui Zhang.

Additional information

Supported by National Natural Science Foundation of China (Grant No. 51175099)

HU Shenghai, born in 1954, is currently a professor at Harbin Engineering University, China. His research interests include naval gun weapon system, NC machining technology, mechanical design theory.

ZHANG Manhui, born in 1991, is currently a PhD candidate at College of Mechanical and Electrical Engineering, Harbin Engineering University, China. His main research interests include metamorphic mechanism, NC machining technology.

ZHANG Baoping, born in 1990, is currently a master candidate at College of Mechanical and Electrical Engineering, Harbin Engineering University, China.

CHEN Xi, born in 1991, is currently a master candidate at College of Mechanical and Electrical Engineering, Harbin Engineering University, China.

YU Wei, born in 1989, is currently a master candidate at College of Mechanical and Electrical Engineering, Harbin Engineering University, China.

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Hu, S., Zhang, M., Zhang, B. et al. Design and accuracy analysis of a metamorphic CNC flame cutting machine for ship manufacturing. Chin. J. Mech. Eng. 29, 930–943 (2016). https://doi.org/10.3901/CJME.2016.0425.059

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  • DOI: https://doi.org/10.3901/CJME.2016.0425.059

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