Prokhorova Elena Vyacheslavovna

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 review of existing ways of parameters definition of the grinding wheels working surface
The conclusion
List used materials

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]