Gabytov V. Investigation the process of a diamond grinding of instrumental materials which are difficult to process at low-frequencies of a grinding circle

ABSTRACT

DonNTU

Master's port

    Faculty: Mechanical

    Speciality: Metal-cutting machine-tools and systems

    Group: ÌÑ-06ì


Theme of master's work:

"Investigation the process of a diamond grinding of instrumental materials which are difficult to process at low-frequencies of a grinding circle. "


Leader of work: Matukha P.

Gabitov_V@ukr.net

Gabitov-V@ya.ru







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Urgency of the work.

Development of instrumental industry is one of the main condition of rise in competitiveness of machine building production in business relations. Nowadays new instrumental materials and methods of processing them to satisfy the level of high technologies are used for instrument production. High-speed cutting steels, hard alloys, ceramics and super-solid materials are widely spread while producing cutting parts of metal-cutting instruments. Mechanical processing of these materials is connected with definite problems, depending on high hardness components comparable with hardness of abrasive materials. That is why these materials are processed by method of diamond grinding. High cutting ability is reached by electro-physical and electro-chemical effects on the working surface of a circle.
The operation of an instrument grinding has some peculiarities which differs from a common plane grinding by a periphery of a grinding circle, namely by increased arc length of circle contact with a processed detail, which is 10-20 more than the analogous parameter at plane grinding by a periphery grinding circle. Contact arc length with a processed detail is defined by size of a grinding area. While grinding instruments and non-resharpened surfaces the whole processed area contacts with the diamond circle working surface large contact arc with the processed detail change the conditions to remove shavings from the bladed area which affects cutting characteristics of a diamond circle.
Nowadays the search for optimal conditions of sharpening instruments or grinding non-reshaped plate is carried out by experimental methods which solves the problem partially and does not reveal reasons for cutting ability deterioration of diamond circles.
Investigations showed that low-frequency imposition (25-100Hz) on the diamond grinding circle while processing high-speed steels and hard alloys leads to positive results. Crack formation has reduced sharply; cutting force decreased 18-20%, grinding temperature fell down 1.2-1.4 times.
The purpose of work is directed at raising the productivity and lowering the prime cost of a diamond grinding of materials that are difficult to process at the expense of low-frequency imposition on the diamond grinding circle. This work is sure to be urgent.

The purpose of investigation is raising the productivity and lowering the prime cost of a diamond grinding with increased contact arcs while grinding materials which are difficult to process at the expense of axial low-frequency influencing the diamond grinding circle.

Object of investigation is the process of a diamond grinding of instrumental materials which are difficult to process at low-frequencies of a grinding circle.

Methods of investigations: theoretical methods based on fundamental principles of the theory of metal–cutting, mathematical modelling, experimental methods.

To achieve these aims it is necessary to solve the following tasks:
  1. Mathematical justification of the reasons for raising the productivity of a diamond grinding with the low-frequency imposition on the grinding circle.
  2. Carryng out the equipment for realization grinding with axial fluctuations.
  3. Grounding the type of super-hard materials for high-speed steels P6M5 grinding with electro-erosion operating action on the circle.
  4. Description of a modernized grinding machine 3Ã71 to realize electro-erosion effect on the grinding circle.
  5. Investigation of a detail in a tense condition to realize axial fluctuations.
  6. Mathematical formulation of a shape of a grinding circles with metal bunch.

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