High-accuracy interference-fit assembly utilizing a hybrid actuator
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This paper presents an innovative press-fitting station that combines a hydraulic cylinder and a piezoelectric actuator to reach micrometric accuracy in axial positioning. The hydraulic cylinder permits a long operation range, while the piezoactuator provides dynamic action and micrometric accuracy. The experimental characterisation of the prototype press is presented together with the physical phenomena influencing the system performance. The tests are done using cylindrical plugs and sleeves to replicate the insertion of shafts into holes. The test samples are designed and machined to obtain a known interference fit. The classic press-fit assembly process can barely reach micrometric accuracy because the deformation on the contact surface cannot easily be measured. The presented press-fit station can overcome these limits thanks to the developed control strategy: When the piezoactuator is driven by an amplitude-modulated sinusoidal signal, it can realize assemblies with a maximum error in the final positioning of ± 2 μm for an insertion force of up to 20 kN.
KeywordsAutomatic assembly Piezoelectric element Hydraulic cylinder Precision positioning Hybrid actuator Micropositioning system
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- 2.Bloch HP (1998) Improving machinery reliability, Gulf professional publishingGoogle Scholar
- 3.Liuti A, Rodriguez Verdugo F, Paone N, Ungaro C (2016) Monitoring techniques for high accuracy interference fit assembly processes. Proceedings of 12th International AIVELA Conference on Vibration Measurements by Laser and Noncontact Techniques 1740:1–12. https://doi.org/10.1063/1.4952677
- 4.Mears ML, Falcon J, Kurfess TR (2006) Real-time identification of sliding friction using LabVeiew FPGA. Proceedings of the American Control Conference 1-12:1410. https://doi.org/10.1109/ACC.2006.1656415
- 5.Lynch KM (1993) Estimating the friction parameters of pushed objects. Proceedings of 1993 IEEE/RSJ International Conference on Intelligent Robot and Systems 1–3:186–193Google Scholar
- 6.Straffellini G (2000) Attrito e usura dei materiali. ASSIMGoogle Scholar
- 8.Al-Bender F (2010) Fundamentals of friction modeling. Proceedings ASPE Spring Topical Meeting on Control of Precision Systems 48:117–122Google Scholar
- 11.Yamagata Y, Higuchi T (1995) A micropositioning device for precision automatic assembly using impact force of piezoelectric elements. Proceedings of IEEE International Conference on Robotics and Automation, 1:666–671. https://doi.org/10.1109/ROBOT.1995.525360
- 13.Lindler JE, Anderson EH, Regelbrugge ME (2003) Design and testing of piezoelectric-hydraulic actuators. Proceedings of SPIE Smart Structure and Material Symposium: Industrial and Commercial Applications of Smart Structures Technology 5054:96–107. https://doi.org/10.1117/12.483888
- 15.Liu YT, Wang CC (2009) One-DOF precision position control using the combined piezo-VCM actuator. Int Sci Index, Biom and Biol Eng 3:8Google Scholar