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MATHEMATICAL MODELING OF OPERATIONAL ZONE FOR TECHNOLOGICAL EQUIPMENT USED FOR DOUBLE-SIDED PROCESSING OF LENSES

https://doi.org/10.21122/2227-1031-2018-17-3-204-210

Abstract

A mathematical modeling of geometric and kinematic relations has been made in respect of an operational zone for one of the standard machine tool sections which is used for simultaneous double-sided abrasive processing of highly-accurate lenses with a small rigidity (with a thin centre) under free lapping conditions. An analytical expression has been obtained for calculation of a sliding velocity in an arbitrarily selected point either on a surface to be processed or on a processing surface. As the proposed technology for simultaneous double-sided processing presupposes oscillatory motion of only processing tools then in order to eliminate a joint opening (a local contact fault between lapping surfaces of a tool and a work-piece) length of a drive piece must be not less than a specified value. In this case a convex tool is rigidly connected with a drive piece and it makes a reversing rotary motion (an oscillatory motion) around a centre of the processed spherical surface and a hinged joint of the centre with an output element of the technological equipment actuation mechanism is realized by transition of the drive piece ball end with a spherical seat in the output unit. In order to reveal analytical dependence of tool drive piece length on radius value of the processed spherical lens surface and friction coefficient in the contact zone of the tool and a work-piece the paper has considered a flow pattern of force while processing concave surfaces of lenses having small radius of curvature in case when the tool is positioned at the top. The friction coefficient included in the obtained expression has been determined for grinding while using suspensions of М40, М28, М10 micro-powders in a cast-iron grinding instrument and polishing while using polyrhythm suspension in a pitch and urethane-foam polisher. A method of the inclined plane has been used in this case and following the method a work-piece of optical glass has been initially lapped to the tool with the help of the appropriate abrasive suspension and the required angle has been determined at the moment when the work-piece started its sliding movement along the tool surface.

About the Authors

A. S. Kozeruk
Belarusian National Technical University
Belarus

Address for correspondence: Kozeruk Albin S. – Belarusian National Technical , 22 Ya. Kolasa str., 220013, Minsk, Republic of Belarus. Tel.: +375 17 292-74-91    kipp@bntu.by

 



Y. L. Malpica
Belarusian National Technical University; Universidad Yacambu
Venezuela, Bolivarian Republic of


M. I. Filonova
Belarusian National Technical University
Belarus


V. I. Shamkalovich
Belarusian National Technical University
Belarus


R. O. Dias Gonzalez
Belarusian National Technical University; Instituto Universitario Politecnico Santiago Marino
Venezuela, Bolivarian Republic of


References

1. Filonov I. P., Klimovich F. F., Kozeruk A. S. (1995) Control Over Shaping Process of Precision Surfaces of Machine and Device Parts. Minsk, DizaynPRO Publ. 208 (in Russian).

2. Kozeruk A. S. (1997) Shaping Process of Precision Surfaces. Minsk, VUZ-YuNITI Publ. 176 (in Russian).

3. Kozeruk A. S. (1997) Control Over Shaping Process of Precision Surfaces of Machine and Device Parts on the Basis of Mathematical Simulation. Minsk. 317 (in Russian).

4. Sulim A. M. (1969) Production of Optical Parts. Moscow, Vysshaya Shkola Publ. 303 (in Russian).

5. Kozeruk A. S., Sukhotskii A. A., Klimovich V. F., Filonova M. I. (2008) Investigation of Kinematic Regularities in Double-Sided Processing of Double Convex Optical Parts. Vestsi Natsyyanal’nai Akademii Navuk Belarusi. Seryya Fizika-Technichnych Navuk = Proceedings of the National Academy of Sciences of Belarus. Physical-Technical Series, (2), 26–31 (in Russian).

6. Bardin A. N. (1963) Technology of Optical Glass. Moscow, Vysshaya Shkola Publ. 519 (in Russian).

7. Artobolevsky I. I. (1988). Theory of Mechanisms and Machines. 4th ed. Moscow, Nauka Publ. 639 (in Russian).

8. Zubakov V. G., Semibratov M. N., Shtandel S. K. (1985) Technology of Optical Parts. Moscow, Mashinostroenie Publ. 368 (in Russian).

9. Kozeruk A. S., Filonov I. P., Sukhotsky A. A., Klimovich V. F., Tabolina E. S. (2008) Machine-Tool for Simultaneous Two-Sided Processing of Lenses with Steep Concave Surface. Patent Republic of Belarus No 10726 (in Russian).

10. Grudev A. P., Zilberg Yu. V., Tilik V. T. (1982) Friction and Lubrication in Metal Forming. Moscow, Metallurgiya Publ. 312 (in Russian).


Review

For citations:


Kozeruk A.S., Malpica Y.L., Filonova M.I., Shamkalovich V.I., Dias Gonzalez R.O. MATHEMATICAL MODELING OF OPERATIONAL ZONE FOR TECHNOLOGICAL EQUIPMENT USED FOR DOUBLE-SIDED PROCESSING OF LENSES. Science & Technique. 2018;17(3):204-210. (In Russ.) https://doi.org/10.21122/2227-1031-2018-17-3-204-210

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ISSN 2227-1031 (Print)
ISSN 2414-0392 (Online)