Flatness Control of Circular Saws

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UDС

674.053:621.934/.936

DOI:

10.17238/issn0536-1036.2017.6.104

Abstract

Contact and noncontact control methods are used to define the flatness of flat products. Optical systems are exploited at noncontact testing. Contact surface monitoring involves the use of mechanical measurement systems or special converters of material physical quantities. Contact methods based on the study of physical parameters of material, allow monitoring the loss of the plate form of equilibrium of the object and the change of residual stresses. The resulting residual stresses have the highest value in the periphery of the disk due to increased heating of this saw zone. The deviation from the flatness of the disk due to the loss of a flat form of equilibrium is asymmetrical. We suggest using the method of acoustic strain measurement to control the flatness of flat circular saws. The principle of the method of acoustic strain measurement consists in changing the propagation velocity of ultrasonic vibrations in material when changing the magnitude of residual stresses. The proposed method involves splitting the disk into the annular zones with their subsequent scanning in the circumferential direction. The deviations of the annular zone from the flatness are characterized by the presence of deformation in the scanned zone and are compared with the zero values of the saw unexploited before. The experimental installation presented in this paper is designed to control the flatness of circular saws by the method of acoustic strain measurement and direct measurement using a dial gauge. In addition, prior to the experiment, the controlled saws are subjected to chemical analysis to demonstrate the conformity of the declared steel grade of all saws. We use a piezoelectric transducer DA-501 with an operating frequency of 5 MHz to excite ultrasonic vibrations in the controlled area; the measurements are performed by an echo method. As a result of the preliminary experiment, we establish the existence of normal distribution of the obtained experimental data. The principal experiment is based on a full factorial design with three variable parameters. According to the results, we embrace the theoretical dependence and prove the possibility of using this method to control the flatness of circular saws.

Authors

A.E. Alekseev, Doctor of Engineering Sciences, Professor
A.P. Alabyshev, Engineer

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; е-mail: a.alabyshev@narfu.ru

Keywords

flatness, circular saw, acoustic strain measurement, ultrasonic vibration, residual stress

For citation

Alekseev A.E., Alabyshev A.P. Flatness Control of Circular Saws. Lesnoy zhurnal [Forestry journal], 2017, no. 6, pp. 104–113. DOI: 10.17238/issn0536-1036.2017.6. 104.

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Received on May 30, 2017