Mechanical faculty
Speciality:
Metal-cutting machine tools and systems
Group:МС-01б
Theme of master's work:"Improvement the way of the study parameters of working surfaces diamond circles by the profilography method".
Leader of work:
Matuha P.G.
Abstract of the Masters work:
General characteristic of work
The Urgency of the problem. Release of competitive machine-building production is closely connected with sharp
rise of a technological level of manufactured machines, increase of reliability and maitenance in operation, increase of their accuracy
and in labour productivity. The decision of these problems is possible due to using of the heightened durability materials and wear resistance,
creation of nonconventional method of processing.
At present one of the high-efficiency technological processes providing high quality of processing, is
diamond grinding by wheel on metal sheaf with electroerosional influence on the working surface of a wheel
(WSC) which can be carried out by introducing a technological current in to a zone of cutting or in an
independent zone.
At the same time, there are no scientific bases, concerning the automatic stabilization of output technological
parameters of a process with maintenance of cutting abilities of a wheel whill processing of hard-processed
materials.
Thus, a problem of electroerosive efficiency increase straightening of diamond wheel and grindings of
hard-processed materials due to maintenance of cutting abilities of a wheel during grinding is an actual
scientific problem.
Researches were made on faculty «Metal-cutting machine tools and systems» of Donetsk national technical
university.
The Purpose of the work. The Purpose of the work is to increase the efficiency and quality of processing
of hard-processed materials by diamond grinding due to increase of cutting abilities of a working surface of a
wheel and reduction of auxiliary time, and also increase of efficiency and expansion of technological
opportunities of diamond grinding.
Technology of research. In a technology experimental methods of research with use of one factor and
multifactor experiments are used. Special devices, adaptations and the computer have also been used.
Scientific novelty. The given installation allows to automate process of data recording and their
processing and in further it will be used to research a relief of the diamond wheel filled in the electroerosive
way. Such method of research of a diamond wheel relief will allow to reduce expenses of time.
The review of existing ways of parameters definition of the grinding
wheels working surface
For studying an arrangement of the abrasive and diamond grains laying on a surface of a wheel, and their
version many methods are offered:
a) studying of prints the wheel surface, received by rolling it on the sooted glass plate, on a
brass plate or on a multilayered foil, a transfer paper [1], [2], [3], [4];
b) studying of the form, quantity and character of distribution of apexes of grains with use of a method of
grinding flats [5];
c) definition of character of distribution and quantity of cutting grains by the method of grinding of a
wedge with a small angle rise [6];
d) photographing of the same places of a grinding wheel through a binocular microscope with the subsequent
consideration of photos through a stereoscope [7, 8] or processing by means of stereometers and
stereocomparators [5];
e) studying of a landform of a grinding wheel by means of microslice surfaces [9];
f) research of a surface of a wheel by means of device PMT-3, and also the microscope supplied by a screw
micrometer and established under a certain angle to the measured surface of a wheel [10];
g) research of a surface of a wheel during grinding by a contactless method by means of the optical sensing
transducer [11];
h) studying of distances between apex of grains and their unequal height on the installation consisting of
optical division of a head, the central tube of a tool microscope and a measuring tube optimeter [12].
On the basis of carrying out the analysis of existing methods of studying of a wheel relief wheel it is possible
to come to conclusion, that the method for definition of abrasive grains apexes coordinates should:
1. allow to distinguish the components, for example grains, a flow bundles located on a surface of a wheel;
2. provide accuracy in measuring distances between tops of the grains located on a surface of a wheel, and
unequal height of grains apexes in a radial direction;
3. provide studying of changing of a landform in time.
In view of the formulated requirements the special method has been developed. The installation from standard
units and special devices on the basis of profilograph - profilometer [13], described in work of Matjuha P.G.
and modernized has been made which has allowed to study character of grains dispersal on a working surface
of a wheel.[14]
The conclusion
To increase the efficiency of diamond grinding of hard-processed materials two basic requirements are
necessary: first, strong sticking of diamond grains in a flow bundle that will allow to use completely unique
cutting properties of diamonds, and the second is constant updating of parameters WSC during processing that
will provide stabilization of target technological parameters of processing and expansion of scale of the
materials processable by diamond grinding. These two requirements can be realized by means of operating
influences on WSC when simultaneously demanded limits with processing of details parameters of a working
surface of a wheel are maintained there fore target technological parameters during all time of processing
are stabilized. Therefore there is a necessity for studying methods of research WSC, to raise productivity of
process of grinding, and also, to have an opportunity to predict quality of a finished workpiece.
List used materials
- Редько С.Г. Количество абразивных зерен шлифовального круга, участвующих в резании.
Станки и инструменты, 1960, №12, с.10-12.
- Nakayama Karuo. Taper print method for the measurement of grinding wheel surface.
«Bull. Jap. Soc. Prices. Eng., 1973, 7, №2, с. 59-60.
- Новосёлов Ю.К. Динамика формообразования поверхностей при абразивной обработке. –
Издательство Саратовского университета, 1979, 232 с.
- Резников А.Н. Теплофизика резания. – М.: Машиностроение, 1969, 288с.
- Сильвестров В.Д. Безалмазная правка шлифовальных кругов – М.: Оборонгиз, 1955, 128с.
- Байкалов А.К., Сукенник И.Л. Алмазный правящий инструмент на гальванической связке. -
Киев: Наукова думка, 1976, 202 с.
- Вольский Н.И. Обрабатываемость металлов шлифованием. – М. – Л.: ГНТИ, Машгиз, 1950, 62с.
- Маслов Е.Н. Основы теории шлифования металлов. – М.: Машгиз, 1951, 177с.
- Бокучава Г.В. Шлифование металлов с подачей охлаждающей жидкости сквозь шлифовальный круг. –
М.: Машгиз, 1959, 107с.
- Редько С.Г., Королев А.В. Формирование профиля шлифованной поверхности. – М., 1970.
(Изв. вузов. Сер. Машиностроение, вып.7), с.159-163.
- Baul R.M., Craham D., Sckott W. Оценка рабочей поверхности шлифовальных кругов. Реф., 133, ВИНИТИ.
Экспресс-информация «Режущие инструменты» №47, 1972, с.1-18.
- Казаков В.Ф. Шлифование при повышенных скоростях резания. – Киев: Техника, 1971, 171с.
- Матюха П.Г. Научные основы стабилизации выходных показателей алмазного шлифования с помощью управляющих
воздействий на рабочую поверхность круга. Автореф. дис. докт. техн. наук – Харьков, 1996, 48с.
- http://www.uran.donetsk.ua/~masters/2001/mech/rogkov/publ/art2/index.htm
Определение параметров рабочей поверхности алмазного круга при профилографировании. Гусев В.В., Рожков Д.Б.(ДонГТУ, г. Донецк, Украина)
General characteristic of work
The review of existing ways of parameters definition of the grinding wheels working surface
The conclusion
List used materials
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