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Master of DNTU Shalskaya Elena

Shalskaya Elena

Faculty of engineering mechanics and mechanical engineering

Speciality: Technology of mechanical engineering

Theme of master's work:

"Increased processing efficiency and quality of machine parts due to the choice of rational conditions for the use of modern tools of materials"

Scientific adviser: Ivchenko Tatiana

About author

Abstract on the topic of final work

Actuality of work

Upgrading details of machines always was the major task of engineering. One of the perspective ways of upgrading treatment is the usage of treatment of materials by thin sharpening.

A research object is cabinet-type details; in particular the detail will be examined from cast-iron "Block of cylinder", to the surface of bore of which great demands are made.

Most efficiency of application of the thin sharpening is possible at the correct, optimum choice of the cutting modes, charts of treatment, geometry and construction of instruments. For the decision of these tasks establishing a connection is needed between operating properties and parameters of superficial layer of details.


Treatment scheme for boring holes (Animation done in the program Gif animator: Number of frames - 5 Number of cycles - 10, size - 151Kb)

Treatment scheme for boring holes

(Animation done in the program Gif animator: Number of frames - 5 Number of cycles - 10, size - 151Kb)


Development of recommendations on the choice of the optimum modes of cutting, development of mathematical model for the calculation of optimum terms of treatment, necessary for a decision tasks of providing of quality of treatment of details from cast-iron and determine actuality of this master's degree work.

Aims and research tasks

Purpose of work - to promote the productivity and quality of treatment of details of machines due to the choice of rational terms of the use of the modern instrumental materials.

     Basic tasks of research:
  1. To probe the nomenclature of modern instrumental materials and construction of instruments, equipped plates from el'bor borazon material.
  2. To study the features of process of treatment cutting with instruments, equipped by ultra-hard materials (UHM)
  3. Development of technological process of treatment of detail of type is a "cabinet".
  4. Development of mathematical dependence of cutting temperature from the modes of cutting at treatment instruments, equipped by UHM.
  5. Development of method of optimization of the modes of cutting with the method of the geometrical programming at the thin sharpening.
  6. Development of recommendations on the choice of optimization of the cutting modes.
  7. Ground of expedience of application of the thin sharpening at treatment of cast-irons on the example of detail of type "cabinet".

Scientific meaningfulness

Scientific meaningfulness of work consists:
  • in development of model of determination of temperature of cutting at the thin sharpening of details depending on the cutting modes;
  • development of mathematical model of optimization of the cutting modes on the criterion of minimum prime price with the usage of method of the geometrical programming;
  • development of mathematical model of determination of roughness of superficial layer depending on the cutting modes.

    • Increase of efficiency of application of ultra-hard instrumental materials due to optimization of the cutting modes

    One of the most widespread methods of optimization presently is a method of the linear programming [1, 2, 3], allowing carrying out simultaneous optimization of speed of cutting and serve, taking into account limitations on the criterion of burst performance. In spite of simplicity and obviousness, this method does not allow deciding the task of optimization of the cutting modes in the case of nonlinear objective function, which is a prime price of treatment of details.

    Such failing the method of the geometrical programming (MGP), which can be used for the decision of tasks of optimization of the modes of cutting at the use of instruments from UHM, is deprived. Purpose of the presented work – to define the optimum cutting modes, providing the minimum prime price of treatment at the set level of quality of the treated surface at the thin sharpening with the usage of cutting tools, equipped by el'bor borazon material –P.

    As a result of decision tasks are determined optimum serve of SO and speed of cutting of VO on these formulas:



    For a example, we’ll give the determinations of the optimum modes of cutting, providing a minimum prime price, for lathe treatment of hard-tempered instrumental steel Р18 (HRC 62-64) on a lathe-screw-cutting machine-tool with PNC 16К20Ф3.

    As a result we will get the next information Sо = 0,084 mm/s, Vо = 54.2 m/pm.

    Conclusions

    On the basis of the developed method conformities to law of change of optimum values of serve and speed of cutting from the roughness of the treated surface and radiuses are set at the top. The developed method of determination of the optimum modes of cutting can be widely used for any types of treatment.

    Planned practical results

    It is necessary to select in the practical value of research results, that:
  • On the base of the executed researches the productivity is increased on 30 – 40% due to optimization of the cutting modes;
  • The recommendations on the choice of optimum construction of the cutting modes are developed.

    • At writing of this abstract of thesis master's degree work is not completed. The completion is planned on December, 2010.


    Literature

    1. Старков В.К. Обработка резанием. Управление стабильностью и качеством в автоматизированном производстве. - М.: Машиностроение. 1989. - 296с.
    2. Оптимизация и управление процессом резания: / О.С. Кроль, Г.Л. Хмеловский. – К.: УМК ВО, 1991. – 140с.
    3. Ивченко Т.Г., Дубоделова О.С. Исследование возможностей комбинированой лезвийной и отделочно-упрочняющей обработки по повышению качества поверхностного слоя и производительности // Прогрессивные технологии и системы машиностроения: Международный сб. научных трудов. – Донецк: ДонНТУ, 2006. Вып. 31. – С.140-146.
    4. Лезвийный инструмент из сверхтвердых материалов: [Справочник] / Н.П. Винников, А.И. Грабченко, Э.И. Гриценко и др.; Под. общ. ред. акад. АН УССР Н. В. Новикова. — К.: Техніка, 1988. - 118 с.
    5. Суслов А.Г., Дальский А.М. Научные основы технологии машиностроения. М.: Машиностроение, 2002. - 84с.
    6. Суслов А.Г. Качество поверхностного слоя деталей машин. - М.: Машиностроение, 2000. - 320с.
    7. Качество машин: Справочник. В 2 т. Т.1 / А.Г. Суслов, Э.Д. Браун, Н.А. Виткевич и др. - М.: Машиностроение, 1995.-256с.
    8. Исследование температуры в зоне резания при точении на токарном станке.(Тольяттинский филиал Самарского Государственного Педагогического Университета)[Электронный ресурс] - Режим доступа - http://allreferat.org.ua/ref/00030665.txt
    9. Ивченко Т.Г. Исследование общих закономерностей изменения температуры резания в различных условиях обработки [Электронный ресурс] -Режим доступа - http://www.nbuv.gov.ua/portal/natural/Npdntu/Mim/2009/7.pdf
    10. Режущие инструменты, оснащенные сверхтвердыми и керамическими материалами, и их применение: Справочник/В.П.Жердь, Г.В. Боровский, Я.А. Музыкант, Г.М. Ипполитов. - М.:Машиностроение, 1987. - 320с.
    11. Лезвийный инструмент из сверхтвердых материалов: Справочник/Н.П.Винников,А.И.Грабченко,Э.И. Гриценко и др.; Под общ. ред. АН УССР Н.В. Новикова. - К. Техника, 1988. - 118с

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