SU1738627A1 - Cutting abrasive disk - Google Patents

Abstract

Use: for abrasive cutting of various blanks. The essence of the invention: the cutting wheel consists of an abrasive disk reinforced with a mesh material with a central hole. Radial channels are provided at the ends of the disk for supplying coolant to the treatment zone (to the periphery of the circle). On the ends of the disc there are end plates made of electrothermal paper or other similar material. Holes are provided in the linings, each of which communicates with a respective radial channel. The filaments of the mesh reinforcing material in the zone adjacent to the central hole are equidistant to the circumference of the central hole of the circle. Such reinforcement improves the strength of the abrasive tool. 3 il.

Description

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The invention relates to the design of cutting abrasive tools and can be used for cutting blanks in machine-building and other enterprises.

A cutting abrasive wheel is known, made in the form of an abrasive disk, on the ends of which, during the pressing of a circle, reinforcing grids are installed, which after pressing and heat treatment rigidly adhere to the abrasive, forming a single whole with it. The tool is fixed with two flanges.

The advantage of this circle is high mechanical strength, the disadvantage is relatively low resistance, due to the low effectiveness of the coolant. When using wheels of this design, coolant cannot be guaranteed to be brought into the cutting zone due to the small side gaps between the workpiece and the abrasive circle deepening into it, and also due to the fact that the air flow generated during rotation of the wheel prevents the coolant from penetrating to the cutting zone. . Cutting blanks occurs almost dry. This increases the temperature in the cutting zone, which leads to a decrease in the durability of the abrasive tool and to a decrease in the quality of the processed surface layers of the workpieces.

Also known abrasive wheel, the cutting part of which is made in the form of individual segments,

The disadvantage of this construction is the absence of reinforcement (reinforcing fibers) between the abrasive segments, which reduces the strength of the tool. The channels open at the ends do not provide a reliable supply of coolant to the cutting zone, since the liquid is dissipated by the air flow generated by the rotation of the circle. High temperatures in the treatment area lead to significant

reduce the resistance of abrasive wheels.

Closest to the proposed is a cutting abrasive wheel, reinforced with a mesh material.

The disadvantage of this design is the violation of the integrity of the reinforcing mesh in the area of the central hole of the circle, which leads to a decrease in the strength of the cutting abrasive tool.

The aim of the invention is to increase the strength and durability of the circle.

Figure 1 shows an abrasive cut-off wheel with radial channels for supplying coolant to the cutting zone; figure 2 is a circle in the faceplate assembly mounted on the spindle of the machine, cross section; on fig.Z - the same general view.

The cutting abrasive wheel consists of an abrasive disk 1 (Fig. 1-3) with a central hole 2, from both ends of which radial channels 3 are made.

The abrasive disk 1 is reinforced with a mesh material 4. The end plates of the electrothermal paper or other similar material are installed at the ends of the circle. When pressing the cut-off wheel, the mesh reinforcing material 4 and the face plates 5 are pressed into the abrasive mass, forming a whole. The sections of the end plates 5 located above the channels 3 during pressing and subsequent heat treatment are connected to the reinforcing mesh 4 impregnated with Bakelite and form a strong wall for the channels in the circle.

Holes 5 are provided in the face plates 5, each of which communicates with a corresponding radial channel. The holes 6 are designed to move coolant from the receiving cavities 7 of the flanges 8 into the radial channels of the cutting disc. The flanges 8 are provided with paddles 9 for injecting coolant into the channels of the circle through the holes 10 at the base of the flanges 8. Using end plates 5 with the holes 6 makes it possible to seal the transitional areas between the holes 10 at the bases of the flanges 8 and the radial channels 3. Eliminate coolant leaks These areas contribute to more efficient cooling of the cutting zone and increase tool life. At the same time, the strength of the abrasive cutting wheel is also high, since the reinforcing fibers in the locations of the holes 6 remain It is intact, and the coolant stream flows

radial channels 3 through the cells of the mesh reinforcing material 4.

The tangential stresses in the abrasive wheels reach a maximum at the central hole and the destruction (rupture) of the circle usually starts from the central hole. The most common method of making a reinforcing mesh is cutting it. Thread cutting

0 mesh in the manufacture of the central hole cutting down reduces the strength of the cutting wheel. To increase the strength of the circle, it is proposed to perform the central hole in the reinforcing meshes without disturbing

5 of the integrity of the fibers, spreading the thread until the desired hole size is obtained (Fig. 1). In this case, the extended threads are arranged around the central hole (equidistantly around the circumference of the central

0 mesh openings) and create an additional zone of resistance arising during the operation of the range of loads.

The circle works as follows. The cutting wheel is mounted on the spindle 5 of the machine between the two flanges 8 and secured with a nut. The alignment of the holes in the flanges with the inlets of the channels of the circle is made according to the marks.

Of the feeding pipes 11, which

0 during the movement of the tool feed, they move together with the wheel, the coolant flows into the internal cavities 7 of the flanges 8, from where through the coarse cellular reinforcing mesh 4 with the help of the blades 9

5 is fed to the input of the radial channels 3 in the abrasive wheel. The liquid entering the channel is additionally accelerated by centrifugal forces, and the circle operates on the principle of a centrifugal water pump.

0 The efficiency of the circle in this mode to a great extent depends on the reliability of the sealing of the inlet openings of the inner channels of the circle with end plates 5.

5 Guaranteed ingress of coolant to the treated surface, increasing the flow rate and speed of the fluid in the channel and in the treatment zone can be more effectively cooled as the cutting tool itself.

0 tool, and cut the workpiece. As a result of reduced heat generation during cutting, the durability of the abrasive tool increases,

Claims (1)

Invention Formula 5 A cutting abrasive disc made in the form of a mesh-reinforced disc with a central hole, characterized in that, in order to increase the strength and durability of the disc, it is provided with end plates, radial channels are made on the end surfaces of the disc, and the mesh reinforcing material and end face are lining installed with the end surfaces of the circle, and in the lining of the holes are made, each of which communicates with the corresponding radial channel, and the threads of the mesh material in the area adjacent to the central hole, equidistant circumference of the hole