4 Study on a Digital Inspection Method for Aircraft Tubing Assembly
47
has completed a number of digital inspection work for aluminum alloy and stainless
steel tubes of 6–32 mm diameter.
Since the multi-point average centerline method is used in the calculation of the
tubing lines’ coordinates, there may be large errors in the inspection of small angle
bent tube. Due to this technical limitation, it is recommended to use it in the inspection
of tubular parts whose bending angle is more than 2°.
4.4 Conclusions
The greatest advantage of the digital inspection technology for aircraft tubing
assembly is that it considers the actual necessary of assembly, unifies the inspection datum and the tubing assembly datum, and decomposes the shape deviation into
axial deviation, radial deviation and angle deviation. And the accurate description
for tubing shape deviation, which corresponds to the butt clearance, the misalignment and the angle deviation in tubing assembly, is realized. This solves the problems of “PJN” and “MJQ” in the traditional inspection method, so that reducing the
production cost and improving the inspection efficiency, finally providing supports
for product quality improvement and data statistical analysis.
It should be noted that the digital inspection technology for aircraft tubing
assembly is the supplement and improvement to the existing digital inspection technology, which can not completely replace the existing inspection methods, and has
great application requirements of tubing assembly in the complex assembly process.
If the fixed joint position of the assembled tubing is not accurate, the tubing inspected
by this method may still not meet the assembly requirements. Anyhow, this inspection method can expand the application scope of ordinary coordinate measurement,
provide another accurate measurement method for the shape inspection of aviation
tubing, and promote the CAD / CAM digital production of aviation tubing.
Acknowledgements The authors gratefully acknowledge the financial support from the special
fund project for civil aircraft (MJ-2016-G-64) and the National Natural Science Foundation of
China (51775441 and 51835011).
References
1. Yang, H., Li, H., Zhang, Z., Zhan, M., Liu, J., Li, G.: Advances and trends on tube bending
forming technologies. Chin. J. Aeronaut. 25, 2–12 (2012)
2. Li, H., Yang, J.C., Chen, G.Y., Liu, X., Zhang, Z., Li, G.J., Liu, W.H.: Towards intelligent
design optimization: Progress and challenge of design optimization theories and technologies
for plastic forming. Chinese J. Aeronaut. in press (2020)
3. Yang, J.C., Li, H., Huang, D., Li, G.J., Yuan, S.: Forming of thin-walled AA6061-T4 tubular
joint by elastomeric bulging: experiment and computation. Int. J. Adv. Manuf. Technol. 107,
25–38 (2020)
47
has completed a number of digital inspection work for aluminum alloy and stainless
steel tubes of 6–32 mm diameter.
Since the multi-point average centerline method is used in the calculation of the
tubing lines’ coordinates, there may be large errors in the inspection of small angle
bent tube. Due to this technical limitation, it is recommended to use it in the inspection
of tubular parts whose bending angle is more than 2°.
4.4 Conclusions
The greatest advantage of the digital inspection technology for aircraft tubing
assembly is that it considers the actual necessary of assembly, unifies the inspection datum and the tubing assembly datum, and decomposes the shape deviation into
axial deviation, radial deviation and angle deviation. And the accurate description
for tubing shape deviation, which corresponds to the butt clearance, the misalignment and the angle deviation in tubing assembly, is realized. This solves the problems of “PJN” and “MJQ” in the traditional inspection method, so that reducing the
production cost and improving the inspection efficiency, finally providing supports
for product quality improvement and data statistical analysis.
It should be noted that the digital inspection technology for aircraft tubing
assembly is the supplement and improvement to the existing digital inspection technology, which can not completely replace the existing inspection methods, and has
great application requirements of tubing assembly in the complex assembly process.
If the fixed joint position of the assembled tubing is not accurate, the tubing inspected
by this method may still not meet the assembly requirements. Anyhow, this inspection method can expand the application scope of ordinary coordinate measurement,
provide another accurate measurement method for the shape inspection of aviation
tubing, and promote the CAD / CAM digital production of aviation tubing.
Acknowledgements The authors gratefully acknowledge the financial support from the special
fund project for civil aircraft (MJ-2016-G-64) and the National Natural Science Foundation of
China (51775441 and 51835011).
References
1. Yang, H., Li, H., Zhang, Z., Zhan, M., Liu, J., Li, G.: Advances and trends on tube bending
forming technologies. Chin. J. Aeronaut. 25, 2–12 (2012)
2. Li, H., Yang, J.C., Chen, G.Y., Liu, X., Zhang, Z., Li, G.J., Liu, W.H.: Towards intelligent
design optimization: Progress and challenge of design optimization theories and technologies
for plastic forming. Chinese J. Aeronaut. in press (2020)
3. Yang, J.C., Li, H., Huang, D., Li, G.J., Yuan, S.: Forming of thin-walled AA6061-T4 tubular
joint by elastomeric bulging: experiment and computation. Int. J. Adv. Manuf. Technol. 107,
25–38 (2020)