Rus Articles Journal

What represents a grinding wheel?

the Grinding wheel are an exact tool with thousands of cutting points. It consists of abrasive grains which keep in a matrix from a sheaf and separate from each other a time. Abrasive grains are a cutting points whereas the role of binding substance is in holding abrasive grains together. A time (blank spaces between the next abrasive grains and binding substance) serves for providing space for penetration of coolers and removal of fragments of metal in the course of polishing.

When the circle rotates with a working speed and the processed subject touches it, abrasive grains cut material which thus is ground; material from it is removed in the form of small particles.

Under the influence of forces arising during polishing the abrasive cutting points wear out and become flat, so, stupid. It leads to increase in friction, accumulation of heat

and increase in forces of cutting.

Increase in forces of cutting leads or to a break of abrasive grain as a result of which new cutting edges appear, or to a break of “bridges“ of a sheaf, holding abrasive grains. In the latter case fresh abrasive grains which begin to process a surface are shown.

In usual operations of polishing by circles on a ceramic sheaf circles have to be ruled. Changing properties of abrasive material, sheaf type, structure of a circle it is possible to create

grinding wheels with the most various grinding characteristics.

ABRASIVES

Modern synthetic abrasives allow to control precisely physical properties

and a form of abrasive grains. It helps to guarantee that grinding wheels can be created with the constant cutting properties.

The Optinstrument offers the broadest choice of types of the abrasive circles differing in the most various specific grinding characteristics. It is necessary for maximum efficiency in a large number of various works which are required in the modern industry.

The size of abrasive

grain the grain Size, or granularity, is the most important factor at determination of ability of a circle to create the required appearance of a surface and to delete material. This size is designated by the number increasing in process of reduction of the size of grain. For example, grain 10 has

in a middle part the size about 2. 0 mm, and grain 60 - 0. 25 mm.

For all circles are used the standard sizes of grain determined in the European standard issued by FEPA.

the Ideal grinding abrasive possesses ability to remain sharp at the minimum zatupleniye of the cutting points, and at a zatupleniye it breaks, opening the new cutting edges.

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