Fandáková, Miriam

Ružiak, Ivan

Suchá, Daniela

Vavro, Ján

Vavro, Ján, jr.

English

DSpace at VSB Technical University of Ostrava

. IN LI tl_J Sbormk vědeckých prací Vysoké školy báňské - Technické univerzity Ostrava číslo I, rok 2008, ročník LI, řada hutnická článekč. 1382 MODAL AND FREQUENCY ANALYSIS OF THE ULTRASONIC MACHINING SYSTEM OF THE BALL-BEARING J. VA VRO1, M. FANDAKOVA 1, J. VA VRO 1, D. SUCHA 1, I. RUŽIAK 1 1 Faculty o/ lndustria/ Technologies; Puchov, S/ovakia, vavroovb@fpt.tnuni.sk ABSTRACT: The paper presents the investigation of the dynamic characteristic of the ultrasonic machining of the ball-bearing. The advantages of this method are shown in the introduction part of the paper. The authors explain the description of the lapping. The dynamic characteristics of the system disc-buster-UZ converter were modelled by the help of the twenty and eight nodal elements. The solútion of the problem had. two parts. 1) the solution of the modal and frequency characteristics2) the solution of the amplitude-frequency characteristic by the .A1elp of the modaldecomposition.KEY WORDS: Modal analysis, frequency analysis, finite elements method I. INTRODUCTIONThe technical progress provokes the growth of the requirement of the high quality bearings with the long working life, high operational preciseness, low noise working and the ability to work with the high r.evolution and in aggressive environments. The special technologies of the world-known producers contribute to the high bearing balls quality too, mainly at the final operation. This paper deals with the problems of the bearing ball surface adjustment by li\pping with the help of the s9per sound exited disc. -From the introduced method is obvious that: 1. The working (lapping) productivity will be increased up to 25 - 30 %.2. Geometrie parameters of the balls will be improved, which has. influence for the bearingvibration level decreasing.3. The ball working life will be increased up to 200 %.4. This technology may be used for the ball grind operation.I.I Description oftbe operation - LappingThe lapping is a precise work operation .based on the friction among a cutting tool, a work andlapping medium. The tools supersonic vibration is expressed in the final increased homogeneity of the mechanical properties across the ball cross section and in overall improvement thanks to structural changes.r The lapping work ball principie with the using of the intensive supersonic is shown in the Fig. I. The balls (l) are rólled between rotating cast iron disc (2) and supporting cast iron disc (3) in the ring grooves, with the press force F, acting on the rotating disc. The supporting disc (3) is vibrationally excited with the piezoelectric ceramic converter (4), which feeds the ultrasonic generator (5). The vibrations from the piezoceramic converter are transferred through a buster to the disc. The lapping suspension (6) is led from the storage tank to the zone among vibrating disc (3), worked material balls {I) and rotating disc (2). The press force acting on rotating disc (2) and in the same time· on working balls (I) is regulated with the help of the hydraulic mechanism. Under the 140 

Modal and frequency analysis of the ultrasonic machining system of the ball-bearing

http://dspace.vsb.cz/bitstream/10084/66776/2/VSB%20HUF%202008-1_32_Vavro.pdf

Modal and frequency analysis of the ultrasonic machining system of the ball-bearing

Abstract

Similar works

Full text

Available Versions

DSpace at VSB Technical University of Ostrava