RU2675873C1 - Set of cutting plates and disk cutter - Google Patents

Abstract

FIELD: cutting.SUBSTANCE: group of inventions relates to the processing of materials by cutting and can be used for milling narrow grooves in products from difficult-to-machine materials. Set of cutting plates for a disk cutter contains cutting plates, each of which is made with a central hole, the upper working and lower base surfaces, between which there are side surfaces with side base surfaces, the main cutting edges formed at the intersection of the side surfaces, auxiliary cutting edges formed at the intersection of the upper working surface with the lateral surfaces, and angular cutting edges with radius rounding, at the same time, the cutting plates of the set are made with different radius of curvature of the corner cutting edges in the range of 0.2–4 mm and the corresponding thickness, providing the width of the milled groove, selected from the above conditions. Disk mill includes a housing with sockets in which the said cutting plates are installed with one radius of curvature of the corner cutting edges with the possibility of their replacement by plates with a different radius of curvature.EFFECT: technological capabilities of disk mills expand.9 cl, 7 dwg

Description

Set of cutting inserts and a disk mill

The field of technology.

The present invention relates to a group of devices used for processing material by cutting, in particular for milling narrow grooves in products from difficult to process materials, including titanium and its alloys.

The level of technology.

To reduce stresses in the corners between the bottom and the side walls of the milled grooves, radius curves are performed, which, depending on the size of the groove and the purpose of the product, have a wide range of radii of curvature. Moreover, in some cases there is a need to mill dimensional grooves in relatively small batches of a fairly rapidly changing product range having different radii of curvature on the machined surfaces. To do this, the corner cutting edges of the inserts must also have corresponding radius curves.

When changing the radial curves on the cutting inserts, their geometric dimensions change, which must be taken into account especially when processing products from hard-to-process materials. Therefore, when milling grooves of the same size, but with different radiuses, it is necessary to have a special cutting insert or other housing of the disk cutter, which allows you to set the cutting insert with a different radius of curvature of the corner cutting edge and get a groove of the same size.

For the manufacture of additional housings for milling cutters or special cutting inserts that are not part of the standard size range of inserts used to complete milling cutters, considerable time and money are required that may not be economically justified. Therefore, it is necessary to develop a number of cutting inserts made using one mold, which allows to have a wide range of radii of curvature of the corner cutting edges due to technologically and economically acceptable grinding. In this case, it is advisable to have a smaller nomenclature of cutting inserts and use one standard size of the disk cutter body for cutting inserts with different radii of curvature of the corner cutting edges, allowing to obtain grooves of the same size with different radial curves.

Known cutting insert (RF patent No. 2584625) containing a housing with a Central part with a hole, the axis of which is the axis of symmetry and rotation of the plate. The housing contains a lower base and upper surface, between which a side surface is located. The lateral surface includes tangentially and radially spaced surfaces, at the intersection of which are asymmetric with respect to the plane passing through the axis of symmetry and rotation of the plate perpendicular to the tangential base of the plate, cutting edges are formed.At the intersection of the upper surface and tangentially located surfaces, radius curves are made with the formation of angular cutting edges.

This cutting insert having a radius of curvature of the corner cutting edges is installed in the socket of the disk cutter body and a groove with angular radius of curvature is milled. However, this insert with a different radius of curvature for the corner cutting edges cannot be used with the same disk cutter body for milling a slot of this size.

The objectives of the present invention are:

- creating a set of cutting inserts with different radii of curvature of the corner cutting edges and thicknesses used with one housing of the disk mill when milling a given width of grooves with different angular radial curves;

- development of the design of a disk mill for using a set of cutting inserts, allowing one to use cutting inserts with different radii of curvature of the corner cutting edges on one mill body to obtain a groove of the same width, which will increase the technological capabilities of disk mills.

SUMMARY OF THE INVENTION

The specified technical result is achieved through a combination of features described in the relevant claims.

A set of cutting inserts for a disk mill used for processing grooves with different angular radial curves contains cutting inserts, each of which is made with a central hole, upper working and lower base surfaces.

Between these surfaces there are lateral surfaces with lateral base surfaces, the main cutting edges formed at the intersection of the side surfaces, auxiliary cutting edges formed at the intersection of the upper working surface with the side surfaces, and corner cutting edges with radiuses.

According to the invention, the cutting inserts of the kit are made with different radius of curvature of the corner cutting edges in the range of 0.2-4 mm and their respective thicknesses, ensuring the width of the milled groove, selected from the conditions:

Si = S (i ± 1) + [(Ri-R (i ± 1)] × cos α × sin β,

where: Si is the thickness of i - cutting insert, providing the width of the milled groove;

S (i ± 1) is the thickness of the next and previous cutting plates, respectively;

Ri is the radius of curvature of the corner cutting edge i - cutting insert;

R (i ± 1) is the radius of curvature of the corner cutting edge, respectively, of the subsequent and previous thickness of the cutting inserts;

α is the angle between the tangent to the radial curvature at the point of transition to the auxiliary cutting edge forming the side wall of the milled groove and the line of location of the centers of curvature of the corner cutting edges of the insert;

β is the undercut angle of the cutting insert installed in the cutter body.

In accordance with one preferred embodiment of the kit, a cross-shaped lowering is made on the upper working surface of the cutting inserts with beams directed towards the side base surfaces, and angular protrusions located near the angular cutting edges.

In accordance with another preferred embodiment of the kit, the main and auxiliary cutting edges of the cutting inserts are arranged pairwise mirror symmetrically with respect to the symmetry axes of the cutting insert.

In accordance with another preferred embodiment of the kit, stripping cutting edges are provided on the auxiliary cutting edges of the cutting inserts.

In accordance with another preferred embodiment of the kit, the thickness of the cutting inserts is selected from the range of 3.3-3.7 mm, and the radius of curvature of the corner cutting edges is selected from the range of 1-2 mm.

In accordance with another preferred embodiment of the kit, the thickness of the cutting inserts is selected from the range of 4.1-4.5 mm, and the radius of curvature of the corner cutting edges is selected from the range of 1-2.5 mm.

In accordance with another preferred embodiment of the kit, the thickness of the cutting inserts is selected from the range of 5.2-7.4 mm, and the radius of curvature of the corner cutting edges is selected from the range of 1-3 mm.

In accordance with the invention, a disk mill for processing grooves with different angular radial curves is provided. It contains a housing with sockets and a set of cutting inserts installed with undercutting in the housing sockets on one and the other of its sides with the possibility of their replacement.

Each cutting insert of the set is made with a central hole, an upper working and lower base surfaces, between which there are side surfaces with lateral base surfaces, the main cutting edges formed at the intersection of the side surfaces, auxiliary cutting edges formed at the intersection of the upper working surface with the side surfaces, and corner cutting edges with radial curves.

In accordance with the invention, a set of cutting inserts according to one of the aforementioned designs is installed in the slots of the disk cutter body.

In accordance with one preferred embodiment of the disk cutter, the cutting inserts are mounted in slots of the disk cutter body with an undercut angle selected from a range of 2.5-6 °.

A brief description of the drawings.

For a better understanding, but only as an example, the invention will be described with reference to the attached drawings, which depict the design of the proposed cutting inserts included in the kit and disk cutters for using the specified kit.

In FIG. 1 is a perspective perspective view of one of the preferred embodiments of the cutting inserts;

in FIG. 2 shows a complete disk mill with the inserts shown in FIG. one;

in FIG. 3 is a fragmentary side view of the disk cutter shown in FIG. 2, assembled with cutting inserts in the groove being machined;

in FIG. 4a, b, c, d in a plane perpendicular to the walls of the groove to be machined, fragments of angular cutting edges with different radial curves of the cutting inserts shown in FIG. 1 and installed in the slots of the disk cutter body.

Detailed description of the drawings.

A set of cutting inserts for a disk mill used for machining grooves with different angular radial curves contains cutting inserts 10, each of which is made with a central hole 16, an upper working 12 and a lower base 14 surfaces, between which side surfaces 18 with lateral base surfaces are located 20, the main cutting edges 22 formed at the intersection of the side surfaces, the auxiliary cutting edges 24 formed at the intersection of the upper working surface 12 with the side overhnostyami 18 and corner cutting edges 26 rounded with radius.

In accordance with the invention, the cutting inserts 10 of the kit are made with different rounding radius of the corner cutting edges 26 in the range of 0.2-4 mm and their corresponding thicknesses, providing the width of the milled groove selected from the conditions:

where: Si is the thickness of i - cutting insert 10, providing the width of the milled groove;

S (i ± 1) is the thickness of the next and previous cutting plates, respectively;

Ri is the radius of curvature of the corner cutting edge i - cutting insert;

R (i ± 1) is the radius of curvature of the corner cutting edge, respectively, of the subsequent and previous thickness of the cutting inserts;

α is the angle between the tangent to the radial curvature at the point of transition to the auxiliary cutting edge forming the side wall of the milled groove and the line of location of the centers of curvature of the corner cutting edges of the insert;

β is the angle of undercut of the cutting insert installed in the housing 38 of the cutter 34.

In accordance with one preferred embodiment of the kit, a cross-shaped lowering 28 is made on the upper working surface 12 of the cutting inserts 10 with the beams 30 directed toward the side base surfaces 20 and the angled protrusions 32 located near the angled cutting edges 26.

In accordance with another preferred embodiment of the kit, the main 22 and auxiliary 24 cutting edges of the cutting inserts 10 are arranged pairwise mirror symmetrically with respect to the symmetry axes of the cutting insert 10.

In accordance with another preferred embodiment of the kit, auxiliary cutting edges 24a are provided on the auxiliary cutting edges 24 of the cutting inserts 10.

In accordance with another preferred embodiment of the kit, the thickness of the cutting inserts 10 is selected from the range of 3.3-3.7 mm, and the radius of curvature of the corner cutting edges 26 is selected from the range of 1-2 mm.

In accordance with another preferred embodiment of the kit, the thickness of the cutting inserts 10 is selected from the range of 4.1-4.5 mm, and the radius of curvature of the corner cutting edges 26 is selected from the range of 1-2.5 mm.

In accordance with another preferred embodiment of the kit, the thickness of the cutting inserts 10 is selected from the range of 5.2-7.4 mm, and the radius of curvature of the corner cutting edges 26 is selected from the range of 1-3 mm.

A disk mill for processing grooves with different angular radial curves 34 comprises a housing 38 with sockets 36, and a set of cutting inserts 10 that can be replaced with undercutting in the housing sockets on one or the other side thereof.

Moreover, each of the cutting inserts 10 is made with a Central hole 16, the upper working 12 and the lower base 14 surfaces, between which are located the side surfaces 18 with the lateral base surfaces 20, the main cutting edges 22 formed at the intersection of the side surfaces 18, auxiliary cutting edges 24 formed at the intersection of the upper working surface 12 with the side surfaces 18, and the angular cutting edges 26 with radius curves.

In accordance with the invention, a set of cutting inserts 10 mounted in sockets 36 of the housing 38 is made one of the above-mentioned versions.

In accordance with one preferred embodiment of the disk mill 34, the cutting inserts 10 are mounted in slots 36 of the housing 38 with an undercut angle β selected from a range of 2.5-6 °.

Description of the invention.

Consider the use of cutting inserts 10 complete with a disk mill 34 with an axis 41 for milling a dimensional groove of width B with radius curves symmetrically located between its walls and bottom, respectively, 1, 1.5, and 2 mm in the product 42.

With this arrangement, the angle α between the tangent to the angular rounding at the point of its transition Ai and Ai ± 1 to the auxiliary cutting edge 24 (24a), forming the side wall of the milled groove, and the line of location of the centers of curvature Oi and Oi ± 1 of the corner cutting edges 26 of the cutting inserts 10 will be equal to 45 degrees.

The cutting inserts 10 are mounted, for example, in the sockets 36 on one or the other side of the housing 38 of the disk cutter 34, for example with the most preferred angle of undercut β = 3.5 degrees, and fastened with screws 40.

First, as an example, consider the use of cutting inserts 10 with a radius of curvature Ri = 1.5 mm for milling a groove with a radius of curvature, for example, 1.5 mm, for example, provided that the cutting insert 10 with a radius of curvature was used on the same housing 38 of the disk mill 34 R (i-1) = 1 mm and a thickness S (i-1) = 4.5 mm, providing a groove size of the same width.

The thickness Si of the cutting insert 10, which provides the size B of the milled groove, when used on the same housing 38, is determined from the expression 1. In this case, we obtain Si = 4.522 mm. Thus, the thickness of the cutting insert 10 has changed by a value of 0.022 mm, which can be technologically obtained by grinding the workpiece of the cutting insert in question on the lower base surface 14.

Next, we consider the use of cutting inserts 10 with the same rounding radius Ri = 1.5 mm, for example, provided that on the same housing 38 of the disk mill 34, a cutting insert 10 with a rounding radius R (i + 1) = 2 mm and thickness S ( i + 1) = 4.543 mm, providing a groove size of the same width. From expression 1 we get the same result Si = 4.522 mm.

Consider another example, the use of cutting inserts 10 with a radius of curvature Ri = 2 mm, for example, provided that on the same housing 38 of the disk mill 34, a cutting plate 10 with a radius of curvature R (i-1) = 1 mm and a thickness S (i + 1) = 4.5 mm, providing a groove size of the same width. From expression 1 we obtain Si = 4.543 mm.

Thus, we obtain a series of cutting inserts 10 with different rounding radii of the corner cutting edges 26 and their corresponding thicknesses that determine the width of the machined grooves, which can be used on the same housing of the disk mill for milling dimensional grooves with different angular radii of curvature, which allows to increase technological capabilities of the cutting tool.

Although the present invention has been described with a certain degree of detail, it should be understood that various changes and modifications can be made without departing from the spirit and scope of the invention set forth in the claims below.

Claims (16)

1. A set of cutting inserts for a disk mill used for processing grooves with different angular radial curves, containing cutting inserts, each of which is made with a central hole, upper working and lower base surfaces, between which there are side surfaces with side base surfaces, the main cutting edges formed at the intersection of the side surfaces, auxiliary cutting edges formed at the intersection of the upper working surface with the side surfaces E, and corner cutting edges rounded with radius, characterized in that the cutting plate set has a different radius of curvature of the corner cutting edges in the range of 0.2-4 mm, and their respective thicknesses, providing milled groove width selected from conditions: Si = S (i ± 1) + [(Ri-R (i ± 1)] × cos α × sin β, where: Si is the thickness of the i-cutting insert, providing the width of the milled groove; S (i ± 1) is the thickness of the next and previous cutting plates, respectively; Ri is the radius of curvature of the corner cutting edge of the i-cutting insert; R (i ± 1) is the radius of curvature of the corner cutting edge, respectively, of the subsequent and previous thickness of the cutting inserts; α is the angle between the tangent to the radial curvature at the point of transition to the auxiliary cutting edge forming the side wall of the milled groove and the line of location of the centers of curvature of the corner cutting edges of the insert; β is the undercut angle of the cutting insert installed in the cutter body. 2. The kit according to claim 1, characterized in that on the upper working surface of the cutting inserts there is a cross-shaped lowering with rays directed towards the side base surfaces and angular protrusions located near the angular cutting edges. 3. The kit according to claim 1, characterized in that the main and auxiliary cutting edges of the cutting inserts are arranged pairwise mirror symmetrically with respect to the symmetry axes of the cutting insert. 4. The kit according to claim 1, characterized in that on the auxiliary cutting edges of the cutting inserts are made stripping cutting edges. 5. The kit according to claim 1, characterized in that the thickness of the cutting inserts is selected from the range of 3.3-3.7 mm, and the radius of curvature of the corner cutting edges is selected from the range of 1-2 mm. 6. The kit according to claim 1, characterized in that the thickness of the cutting inserts is selected from the range of 4.1-4.5 mm, and the radius of curvature of the corner cutting edges is selected from the range of 1-2.5 mm. 7. The kit according to claim 1, characterized in that the thickness of the cutting inserts is selected from the range of 5.2-7.4 mm, and the radius of curvature of the corner cutting edges is selected from the range of 1-3 mm. 8. A disk mill for processing grooves with different angular radial curves, comprising a housing with sockets and a set of cutting inserts with the possibility of replacing them, each of which is made with a central hole, the upper working and lower base surfaces, between which side surfaces are located with side base surfaces, main cutting edges formed at the intersection of the side surfaces, auxiliary cutting edges formed at the intersection of the upper working surface with the side surfaces, and angular cutting edges with radiuses, characterized in that it comprises a set of cutting inserts installed in the housings according to one of claims. 1-7. 9. The disk mill according to claim 8, characterized in that the cutting inserts are mounted in slots of the body of the disk mill with an undercut angle selected from the range of 2.5-6 °.

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