Accuracy of the pneumatic follower for the wooden surface quality assessment
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ORIGINAL
Accuracy of the pneumatic follower for the wooden surface quality assessment Cz. J. Jermak1 · M. Rucki2 · M. Jakubowicz3 Received: 1 October 2019 © The Author(s) 2020
Abstract Wooden or wood-plastic composite surfaces are often valued for their aesthetic appearance and the quality of the surface. Independent from the technology, the surface features may be assessed using typical roughness parameters. In this paper, a pneumatic non-contact method is proposed. Despite certain limitations in surface characteristics measurement, air gauges proved to be a good tool for wooden surfaces, much cheaper than the laser profilometers. In the current research, a novel non-contact air gauge was combined with a slider to eliminate the influence of the asperities of higher order (waviness) and to protect the wooden surface from being damaged by the measuring nozzle. The measurement signal was used to control a follower that kept constant distance between the surface and the nozzle edge. The measuring speed was set at 0.8 mm/s, and the back-pressure was measured with accuracy of 0.01 kPa with real time acquisition. A series of measurements was taken, and the results were compared with the ones obtained from Perthen S8P profilometer (contact measurement) and WYKO NT 1100 interferometer microscope.
1 Introduction Surface quality of the machined wood is one of the most important characteristics that has impact on further manufacturing processes, such as finishing, and subsequently effects on the strength of adhesive joints etc. (Aguilera et al. 2016). Wooden or wood-plastic composite (WPC) surfaces are often valued for their aesthetic appearance, for example, in the case of furniture. In both cases the appearance depends on the quality of the surface, which must be machined and finished in a proper way. Among the most common methods of shaping the wooden surface are cutting, laser treatment, * M. Rucki [email protected] Cz. J. Jermak [email protected] M. Jakubowicz [email protected] 1
State University of Applied Sciences in Konin, Przyjazni Street 1, 62510 Konin, Poland
2
Faculty of Mechanical Engineering, Kazimierz Pulaski University of Technology and Humanities in Radom, Stasieckiego Street 54, 26600 Radom, Poland
3
Division of Metrology and Measurement Systems, Poznan University of Technology, Piotrowo 3, 60965 Poznan, Poland
chemical finishing, impregnation and other treatments aimed at rheological properties. Recently, propositions and investigations on plasma modification of the wooden surface were reported (Peng and Zhang 2019). Independent from the technology, the surfaces may be assessed by means of roughness parameters, such as mean peak-to-valley height Rz, usually referred to as ten-point height, and average roughness Ra commonly known as arithmetic mean deviation, according to the ISO 4287 (1997) standard (Jarusombuti and Ayrilmis 2011). It should be noted, however, that the methods and parameters applied to the measurement of the metal surface features, are not always applica
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