RU136757U1 - GRINDING CIRCLE WITH INTERRUPTED PERIPHERAL SURFACE - Google Patents

Abstract

1. Intermittent grinding wheel, made in the form of an abrasive disk with a bore hole and having on the peripheral surface straight grooves parallel to each other at an angle to the axis of rotation of the wheel, characterized in that the ends of adjacent grooves on opposite sides of the peripheral surface of the disk are at the same level with mutual overlap by half the width of the groove. 2. Intermittent grinding wheel according to claim 1, characterized in that to ensure mutual overlap, the angle α of the inclination of the grooves to the axis of rotation of the wheel is selected from the condition: where D is the outer diameter of the circle, mm; β is the circumferential pitch of the grooves, degree; k is the width of the groove , mm; B - circle height, mm.

Description

The proposed utility model relates to tools for grinding, in particular, to abrasive wheels for processing products with their peripheral part.

The discontinuity of the cutting surface of the grinding wheel creates favorable conditions for the supply of cutting fluid and waste during processing. This reduces the temperature in the cutting zone. As a result, the cutting properties of the wheel are improved and the quality of the machined surface is improved.

Known flat and cup grinding wheels with an intermittent working surface at the periphery or at the end in the form of grooves, slots, notches, holes (see, for example, Abrasive and diamond processing of materials: reference book / edited by A.N. Reznikov. M .: Engineering, 1977).

Known intermittent abrasive wheel containing on a cylindrical working surface alternating protrusions and depressions (patent RU No. 2165351, publ. 04/20/2001). Its peculiarity lies in the fact that in the end plane of the depression, a straight line connecting the arcs of the circumference of the working surface of two adjacent protrusions is described. The disadvantage of this device is the low quality of processing, since the protrusions on the working surface of the circle create a high undulation of the treated surface.

Known discrete grinding tool made in the form of a continuous grinding wheel with radial holes on the cutting surface, arranged in rows parallel to the axis of rotation of the tool (patent RU No. 2385216, publ. 03/27/2010). The circle is characterized by the fact that the radial holes are located in alternating long and short rows with an offset of half the axial pitch from their location in the direction of the rows. The disadvantage of this device is the complexity of manufacturing.

By the set of similar essential features, the closest technical solution to the claimed device can be selected, for example, intermittent grinding wheel (patent RU No. 88600, publ. 20.11.2009). Known intermittent grinding wheel contains an abrasive disk, on the peripheral surface of which there are hollows with an angle of inclination to the axis of rotation of the wheel equal to from 10 ° to 80 °, and an angular step equal to from 10 ° to 80 °.

A disadvantage of the known device is that for different angles of inclination of the grooves and their angular pitch in the indicated ranges on the working peripheral surface of the circle in the cutting zone may be one, two or none of the grooves. Therefore, various grinding conditions are created around the periphery of the wheel, as a result of which it wears out unevenly and loses its shape accuracy. Frequent revision of the circle is required, which significantly reduces its dimensional stability.

The claimed utility model was tasked with increasing the uniformity of work and the resistance of the grinding wheel.

The technical result of the claimed device is to increase the uniformity of the grinding wheel due to the constancy of the contact area with the workpiece in the cutting zone and at the same time increase the resistance due to uniform wear of the wheel on the peripheral surface.

The problem is solved in that a discontinuous grinding wheel is proposed, comprising an abrasive disk with a bore hole, on the peripheral surface of which there are made straight grooves parallel to each other at an angle to the axis of rotation of the wheel.

New in the proposed device is that the ends of adjacent grooves on opposite sides of the peripheral surface are located at the same level with mutual overlap by half the width of the groove.

New in the proposed device is also the fact that to ensure mutual overlap, the angle of inclination of the grooves to the axis of rotation of the circle is selected from the condition

,

,

where α is the angle of inclination of the groove to the axis of the circle, degree; D is the outer diameter of the circle, mm; β is the circumferential pitch of the grooves, degree; k is the width of the groove, mm; B - circle height, mm.

The proposed device is illustrated by drawings: in FIG. 1 is a drawing of a grinding wheel, the main view, in FIG. 2 is a drawing of a grinding wheel, side view, in FIG. 3 - scan of the peripheral surface of the grinding wheel.

Intermittent grinding wheel contains an abrasive disk 1 with a bore hole 2, on the peripheral surface of which there are made straight grooves 3 located parallel to each other and at an angle α to the axis 4 of rotation of the wheel (Fig. 1). The abrasive disk 1 has an outer diameter D and a height B. The circumferential pitch of the grooves 3 is characterized by an angle β (FIG. 2).

The ends of adjacent grooves 3 on opposite sides A and B of the peripheral surface are located at the same level with mutual overlap by half the value k of the width of the groove (Fig. 3).

To ensure mutual overlap, the angle α of the inclination of the grooves 3 to the axis 4 of rotation of the circle is selected from the condition

.

.

The device operates as follows.

An intermittent grinding wheel is mounted on the machine spindle using the bore 2. The grinding wheel rotates with a cutting speed around axis 4 and moves in the longitudinal and transverse directions with the feed speed. Also, the grinding wheel moves in the radial direction to the cutting depth in one working stroke.

Upon contact with the surface to be treated, the abrasive disk 1 removes metal using cutting grains located on its peripheral surface. Due to a number of parallel rectilinear grooves 3 on the peripheral surface of the grinding wheel, the cutting process will be intermittent, which reduces the cutting temperature. Also, grooves 3 can be used to supply cutting fluid to the cutting zone and waste disposal during grinding.

The location of the grooves 3 at an angle a to the axis 4 of rotation of the circle with mutual overlap on the periphery by half the width of the groove is provided, for example, by choosing the angle α from the condition

.

.

The location of the grooves 3 with mutual overlap on the periphery helps to increase the uniformity of the grinding wheel due to the constant contact area with the workpiece in the cutting zone. This also provides increased resistance due to uniform wear of the circle on the peripheral surface.

Claims (2)

1. Intermittent grinding wheel, made in the form of an abrasive disk with a bore hole and having on the peripheral surface straight grooves parallel to each other at an angle to the axis of rotation of the wheel, characterized in that the ends of adjacent grooves on opposite sides of the peripheral surface of the disk are at the same level with overlapping half the width of the groove. 2. Intermittent grinding wheel according to claim 1, characterized in that to ensure mutual overlap, the angle α of the inclination of the grooves to the axis of rotation of the wheel is selected from the condition: $$\alpha =\frac{\pi D\beta -180k}{360B}$$

, where D is the outer diameter of the circle, mm; β is the circumferential pitch of the grooves, degree; k is the width of the groove, mm; In - the height of the circle, mm.

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