Bychkov VI THE ABSTRACT OF FINAL WORK OF THE MASTER
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Bychkov Vitaly Igorevich


Theme of masters works: "Research of reliability indexes and longevity of lathes 9А340F1 and KG9340 in the conditions of the Joint-Stock Istil (Ukraine)"

The head of work: the senior lecturer of faculty " MOZCHM " Sidorov Vladimir Anatolyevich

Ukraine                    Russha

THE ABSTRACT OF FINAL WORK OF THE MASTER


        Grounding Actuality

     The surfaces of ingot are exposed to finishing. Depending on the group of surface an ingot is exposed to selective or continuous finishing. An outward layer is taken off by even furrows along a cylindrical part of a bar in places having defects. Flaying is done with an ingot delivery of which must be produced in the robbed state according to technical terms and standards, and also with the ingots, requiring re-turning on a less diameter because of superficial defects. Flaying of ingot is produced on lathes 9А340F1 and KG9340.

9А340Ф1

Figure 1 - Flaying of the machine tool 9А340F1

КЖ9340

Figure 2 - Flaying of machine tool KG9340

    The centerless-turning machines work in comparatively heavy conditions, in the conditions of large dynamic loadings. Therefore there are often breakages, that result in downtime. For successful exploitation of machine-tools in the conditions of alteration of national economy of our country new principles and approaches for the decision of tasks of technical service and repairs are used. To such new approaches on a modern stage the wide use of stationary facilities of technical diagnostics allowing to reduce the expenditures of labour on service and repair belongs first of all.


        Purpose and tasks of work

    The purpose of work consists in defining the machine units which are out of order most often in order to mount sensors on them. For this purpose it is necessary :
      -  To make the failure analysis ;
      -  To choose the method of diagnosing;
      -  To define the points of sensor mounting;
      -   To develop the stationary system of diagnosing.


        Scientific novelty


   The purpose of the work is to develop the 32-channel stationary system of diagnosing for 9А340F1 and KG9340.This question has not been studied yet. For this reason it has a scientific novelty both for the «MOZCHM department», and for the personnel servicing given equipment.


        Practical result

    The planned practical result is that the system of diagnosing will allow to watch automatically the operation of machine-tools with the help of devices and in the case of the critical state of one of the units, it will let the operator know about a failure, displaying it on the control board.


Ways of solution:


    For diagnostics of the details included in to the typical units, we will choose the following diagnostic parameters:
      1.  noise level;
      2.  vibrations level(vibration speed, vibration acceleration);
      3.  temperature;
      4.  deformation.


    For monitoring and control of above listed parameters it is possible to apply the following types of diagnostics devices:
      1.  manual or electronic stethoscope;
      2.  vibrometer VShV-003-1M-003-1М;
      3.  indicator probe G112-5-0MM11;
      4.  temperature sensors;


    In machine-tools, rolling bearing are used as well as gearing , and touching and cavitation are similarly possible so it is necessary to watch the high-frequency constituent of vibration. It is comfortably to diagnose bearing on the vibration concentrated on frequencies about kiloherts (50-70 harmonics from circulating frequency). The defects of gearing are localized on frequencies of «clutching», equal to the product of frequency of rotation of a gear and the number of teeth on it. The controlled band must include frequency of clutching. With probability of origin of touching, vibration, similarly as well as at the defects of bearing has a splash on a few kilocycles. In the system of monitoring for measuring the vibration both the separate sensors, mounted in points measuring with the use of magnet or spiral or retained by hand when using measuring probe, and stationary mounted sensors of the continuous system of vibration control can be used. The piezoelectric accelerometers are the most universal and most often used sensors at present. Accelerometers is the transformer of mechanical vibrations of object into an electric signal proportional to the vibration acceleration. As a result of piezoelectric effect on the surface of a piezo-element there is an electric signal proportional to influencing force and acceleration of mechanical vibrations. Frequency range is from 0 a to 1/3 resonance frequency of accelerometers (usually 30 kGts). Accelerometers have mainly linear range sensitivity, they work long time, and they only need periodic calibration. The overheat power pack can be controlled by temperature sensors, which would pass a signal about an overheat to the programmer control board.




        The literature

  1.Методическое указание к самостоятельной работе над курсовым про-ектом по деталям машин», раздел 3 «Эскизный проект. Технический проект» /сост. В.С.Горелик и др.- Донецк: ДПИ, 1992, 84с.
  2.Справочник технолога машиностроителя» том 2, А.Н.Малов.М.: «Машиностроение», 1972, 568с.
  3.Предупреждение разрушения деталей забойного оборудования / Н. Б. Шубина, Б. П. Грязнов, И. М. Шахтин и др. – М., Недра, 1985. - 215 с.
  4. Сидоров В.А., Серебров Л.М. «Основы работы с виброметрами-анализаторами» // Конспект лекций семинара-практикума – Донецк,2003. – 113 с.
  5. Марутов В.А. и Павловский С.А. Гидроцилиндры. Конструкция и расчет. – М "Машиностроение", 1966. – 315 с.
  6. Производство блюмов, слябов и заготовок из углеродистых и легированных сталей в обжимном цехе. Технологическая инструкция. ТИ – 234 – П.03.01 – 95. Донецкий металлургический завод.: – Донецк, 1995. – 225 с.
  7. Целиков А.И., Полухин П.И., Гребеник В.М. и др. Машины и агрегаты металлургических заводов. Том 3. Машины и агрегаты для производства и отделки проката. – М.: Металлургия, 1988. – 576 с.
  8. Королев А.А. Конструкция и расчет машин и механизмов прокатных станов. Учеб. пособие для вузов. – М.: "Металлургия". 1985. – 367 с.
  9. Анурьев В.И. Справочник конструктора-машиностроителя: В 3-х т. Т.1. – М.: Машиностроение, 1982. – 736 с.
  10. Раздаточный материал к выполнению расчетов крюковвывх пдвесок по диссцмплине: "Подъемно-транспортные машины". П.И. Пузырьков. Днепропетровск ., 1991, 28 с.

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