GAVLAS, Martin, Michal KACO, Vladimir DEKÝŠ, Miroslav ŠPIRIAK, Silvia SLABEJOVÁ, Andrej CZÁN, Jozef HOLUBJAK, Milena KUŠNEROVÁ, Marta HARNIČÁROVÁ and Jan VALÍČEK. Research on the Oscillation in Centerless Grinding Technology When Machining Bearing Steel. Materials. Basel, Switzerland: MDPI, neuveden, 15/2022, p. nestránkováno, 14 pp. ISSN 1996-1944. 2022.
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Basic information
Original name Research on the Oscillation in Centerless Grinding Technology When Machining Bearing Steel
Authors GAVLAS, Martin (guarantor), Michal KACO, Vladimir DEKÝŠ, Miroslav ŠPIRIAK, Silvia SLABEJOVÁ, Andrej CZÁN, Jozef HOLUBJAK, Milena KUŠNEROVÁ (203 Czech Republic, belonging to the institution), Marta HARNIČÁROVÁ (203 Czech Republic, belonging to the institution) and Jan VALÍČEK (203 Czech Republic, belonging to the institution).
Edition Materials, Basel, Switzerland, MDPI, 2022, 1996-1944.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 20501 Materials engineering
Country of publisher Switzerland
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/75081431:_____/22:00002387
Organization unit Institute of Technology and Business in České Budějovice
UT WoS 000831636700001
Keywords in English centerless grinding; vibrodiagnostics; analysis of the run-up and run-down; boxplot; spectral analysis; STFT; geometric deviation
Tags KSTR5, RIV22, WOS
Changed by Changed by: Mgr. Nikola Petříková, učo 28324. Changed: 21/3/2023 18:34.
Abstract
In today’s engineering industry, technical diagnostics presents many advantages for improving the management of machining centers and automated production lines. As the fourth industrial revolution is currently being implemented, which includes machine diagnostics, the idea of adding information from the field of vibrodiagnostics was born. The vibration of the workpiece or machine tool negatively affects the geometric parameters of the machined surfaces of the workpiece. Through vibrodiagnostics, the influence of cutting parameters on the oscillation of a bearing steel workpiece during centerless grinding is investigated. The presented publication deals with the vibration of the mechanical parts of a centerless grinding machine. The oscillations are recorded by acceleration sensors, which are also placed on the support ruler in which the workpieces are guided, and the recorded data are input parameters for statistical processing of acceleration values in the form of statistical characteristics (minimum, lower quartile, median, upper quartile, maximum). In this paper, this procedure was applied for the selection of the optimum cutting parameters (for the speed of the support wheel), where the machining parameters at which the minimum oscillation values occur were selected based on the above-mentioned statistical characteristics. This optimization procedure revealed increased vibration values which reached the highest amplitude on the ruler, namely accelerations of 11 m/s2 , the origin of which was subsequently detected by STFT because the occurrence of resonance events or the excitation of natural frequencies of the machine were suspected. The STFT analysis identified a resonant region at machine start-up determined by the spindle speed which excites the resonance on the machine. The speed range between 1950 and 2150 rpm, which corresponds to the built-up resonance, was provided to the technologists to ensure that the machinebwas not operated around this resonance region at 400 and 760 Hz until the undesired phenomenon was eliminated. The results of the individual measurements provided information on the ideal setting of the cutting parameters and the current state of the machine.
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