THE INFLUENCE OF TECHNOLOGY FACTORS ON THE LOCAL TEMPERATURES DURING THE ULTRASONICALLY ASSISTED GRINDING


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Abstract

The application of ultrasonic vibrations (USV) power is one of the means for heat depression of the grinding process. However, the existing studies do not reveal the mechanism of USV influence on the local temperatures. To identify the significance of technological factors influencing the temperature of ultrasonic assisted grinding process, it is necessary to develop physical and mathematical models for heat-transfer factor calculation, the methodology, the algorithm and the software for the local temperatures calculation, and to carry out the numerical simulation of temperatures. The author specified the factors having prevalent influence on the local temperatures during ultrasonic assisted grinding and gave the dependencies for calculation of the lubricating-cooling fluid motion speed in the area of contact of a grinding wheel with a workpiece, lubricating-cooling fluid consumption through the area of contact and the heat-transfer factor of work piece, abrasive grains and wheel bond to the lubricating-cooling fluid. The paper presents the results of numerical simulation of the local temperatures in the area of contact of a grain with a workpiece and a chip during micro-cutting by the first of the subsequently working grains. When applying USV, the temperatures reduce mostly in the result of the change of the strain-stress state in the treatment area due to the strength characteristics degradation including the tensile strength of a workpiece material and the change of kinematics of the workpiece material micro-cutting by the single abrasive grains of a grinding wheel. The increase of consumption of lubricating-cooling fluid through the treatment area and the intensification of its cooling action influence the local temperatures insignificantly. The author identified the influence of the USV parameters (amplitude and phase) on the local temperatures change depending on the duration of contact of a grain with a workpiece. As a result, the degree of technology factors influence on the local temperatures during the ultrasonic assisted grinding was established analytically for the first time. The author determined that the USV application allows reducing local temperatures by a mean of 12 … 24 %.

About the authors

Aleksandr Nikolaevich Unyanin

Ulyanovsk State Technical University, Ulyanovsk

Author for correspondence.
Email: a_un@mail.ru

Doctor of Sciences (Engineering), Associate Professor, professor of Chair “Mechanical engineering”

Russian Federation

References

  1. Vologin M.F., Kalashnikov V.V., Nerubay M.S., Shtrikov B.L. Priminenie ultrazvuka i vzryva pri obrabotke i sborke [Application of ultrasonic vibrations and explosion when processing and assembling]. Moscow, Mashinostroenie Publ., 2002. 264 p.
  2. Agapov S.I. Intensifikatsiya protsessa obrabotki trudnoobrabatyvaemykh materialov pri vvedenii ultrazvukovykh kolebaniy v zony rezaniya [Intensification of treatment process of hard-to-treat materials when introducing ultrasonic vibrations to cutting area]. Volgograd, VolgGTU Publ., 2009. 78 p.
  3. Agapov S.I., Golovkin V.V. Povyshenie effektivnosti mekhanicheskoy obrabotki putem primeneniya ultrazvuka [Efficiency improvement of mechanical treatment by means of ultrasonic application]. Samara, SNTs RAN Publ., 2010. 134 p.
  4. Unyanin A.N. Kinematics of micro-cutting by abrasive grains during workpiece ultrasonic assisted grinding. Sbornik statey mezhdunar. nauch.-tekhn. konferentsii “Sovremennye naukoemkie tekhnologii: prioritety razvitiya i podgotovki kadrod”. Kazan, Kazansky gos. tekhn. universitet Publ., 2014, pp. 92–97.
  5. Unyanin A.N. The study of temperature field when grinding with ultrasonic activation. Vektor nauki Tolyattinskogo gosudarstvennogo universiteta, 2015, no. 2-2, pp. 191–195.
  6. Kumabe D. Vibratsionnoe rezanie [Vibration cutting]. Moscow, Mashinostroenie Publ., 1985. 424 p.
  7. Poduraev V.N. Obrabotka rezaniem s vibratsiyami [Cutting with vibrations]. Moscow, Mashinostroenie Publ., 1970. 353 p.
  8. Kiselev E.S., Kovalnogov V.N. Mekhanicheskaya obrabotka zagotovok v usloviyakh kruticheskogo teplomassoperenosa [Mechanical processing of blank parts in the circumstances of critical heat and mass transfer]. Moscow, RAN Publ., 2008. 250 p.
  9. Reznikov A.N. Teplofizika protsessov mekhanicheskoy obrabotki materialov [Thermal physics of mechanical processing of materials]. Moscow, Mashinostroenie Publ., 1981. 279 p.
  10. Reznikov A.N., Reznikov L.A. Teplovye protsessy v tekhnologicheskikh sistemakh [Thermal processes in technological systems]. Moscow, Mashinostroenie Publ., 1990. 288 p.
  11. Bolgarsky A.V., Mukhachev G.A., Shchukin V.K. Termodinamika i teploperedacha [Thermodynamics and Heat transfer]. Moscow, Vysshaya shkola Publ., 1975. 495 p.
  12. Unyanin A.N. On the issue of heat exchange of the objects contacting with the environment during grinding. Sbornik trudov 4oy mezhdunar. nauch.-tekhn. konferentsii “Fizicheskie i kompyuternye tekhnologii v narodnom khozyaystve”. Kharkov, KhGPU Publ., 2001, pp. 79–82.
  13. Khudobin L.V., Unyanin A.N. Minimizatsiya zasalivaniya shlifovalnykh krugov [Minimizing brining grinding wheels]. Ulyanovsk, UlGTU Publ., 2007. 298 p.
  14. Kiselev E.S. Teplofizika pravki shlifovalnykh krugov s primeneniem SOZh [Thermal physics of wheel dressing with lubricating-cooling fluid application]. Ulyanovsk, UlGTU Publ., 2001. 170 p.
  15. Klushin M.I., ed. Tekhnologicheskie svoystva novykh SOZh pri obrabotke rezaniem [Processing characteristics of new lubricants during cutting]. Moscow, Mashinostroenie Publ., 1979. 192 p.
  16. Kiselev E.S., Unyanin A.N., Kovalnogov V.N. Efficiency of new ultrasonic technique for lubricant supply in complex grinding. Vestnik mashinostroeniya, 2001, no. 1, pp. 48–50.
  17. Kovalnogov N.N. Pogranichny sloy v potokakh s intensivnymi vozdeystviyami [Boundary layer in flows with severe exposure]. Ulyanovsk, UlGTU Publ., 1996. 246 p.
  18. Khudobin L.V., Kotelnikova V.I., Polyanskov Yu.V. Ultrasonic activation of lubricating-cooling fluids during abrasive treatment. Vestnik mashinostroeniya, 1975, no. 4, pp. 51–53.
  19. Efimov V.V. Nauchnye osnovy tekhniki podachi SOZh pri shlifovanii [Scientific foundations of technology of lubricants feeding during grinding]. Saratov, Saratovsky universitet Publ., 1985. 140 p.
  20. Rebinder P.A. Poverkhnostnye yavleniya v dispersnykh sistemakh. Fiziko-khimicheskaya mekhanika [Surface phenomena in disperse systems. Physicochemical mechanics]. Moscow, Nauka Publ., 1979. 381 p.
  21. Koldaev V.D. Chislennye metody i programmirovanie [Numerical methods and programming]. Moscow, INFRA-M Publ., 2009. 544 p.

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