SU1454579A1 - Multiple-face cutting plate - Google Patents

Abstract

The invention relates to metal cutting, in particular to cutters with interchangeable cutting inserts. The purpose of the invention is the expansion of technological capabilities due to the fact that in a plate having a form / regular tetrahedron, all cutting edges adjacent to one vertex can be used as workers. The cutting multi-faceted plate is made in the form of a regular tetrahedron with six cutting edges 1-6. The vertices of the tetrahedron are cut off by a sphere of radius R whose center lies at the center of the tetrahedron, with the value of radius R being chosen based on the ratio R 0.5 (a, 5-b), where R is the radius of the sphere; a is the edge of the tetrahedron; b is a constant value. When the plate is placed in the working position, the main cutting edge 1 is formed by the intersection of the main back surface 7 with the front surface. At the intersection of the front surface 8 with the auxiliary rear surfaces 9 and 10, cutting edges 2 and 3 are formed. Surfaces 7, 9 and 10 are in this case supporting plates of the plate. The cutting edges 4, 5 and 6 are identical to the cutting edges 1,2 and 3 in length and are formed by the corresponding surfaces. The plate is secured in the collecting tool. The cutting plate is installed in the holder's seat, secured by a clamp through the support plate with a screw. 3 il. s ate F O1 | d frr.1

Description

The invention relates to metal cutting, in particular to cutters with interchangeable cutting inserts.

The purpose of the invention is the expansion of technological capabilities.

In a plate having the shape of a regular tetrahedron, all cutting edges adjacent to one vertex can be used as workers.

FIG. t schematically shows the cutting plate in isometry; in fig. 2 is a cutter with a mechanical fastening of the plate in FIG. 1 in FIG. 3 - section A-A in FIG. 2,

The cutting multi-faceted plate is made in the form of a regular tetrahedron with six cutting edges 1-6. The vertices of a regular tetrahedron are cut off by a sphere of radius R whose center lies at the center of the tetrahedron. The value of the radius R is selected by calculation and associated with the edge a of the tetrahedron by the ratio

R 0.5 (a 4l, 5 - b),

where R is the radius of the sphere;

a is the edge of the tetrahedron;

b is a constant value, b

 K..2.

When the plate is placed in the working position, the main cutting edge 1 is formed by the intersection of the main back surface 7 with the front surface 8. At the intersection of the front surface 8 with the auxiliary rear surfaces 9 and 10, cutting edges 2 and 3 are formed. Surfaces 7, 9 and 10 herewith the reference planes of the plate. The cutting edges 4,5 and 6 are identical to the cutting edges 1, 2 and 3 in length and are formed by the respective surfaces.

When the main cutting edge 1 is worn, the plate is placed on the supporting surfaces 7, 9 and 10. In this case, the main cutting edge is the edge 2, which is formed by the intersection of the front surface B with the rear surface 9. When used as the main cutting edge of the edge 3, the plate is set to bearing surfaces 10, 7 and 9. In this case, the main cutting edge 3 is formed by the intersection of the front surface 8 with the main rear surface 10. When used as the main cutting edges are edges 4, 5

,

Q

five

0

five

0

five

0

and 6 surfaces 7, 8 and 10 are alternately used as a support when fixing the cutting insert.

The attachment of the described cutting insert is shown by the example of its use in a combined cutter. The cutting plate is installed in the seat of the holder 11, secured by the clamp 12 through the support plate 13 with the screw 14. In the slot of the holder 11, grooves 15 are made to prevent the cutting edges of the plate from chipping when fixed in the assembled combined tool.

Depending on the fit of the nest in the holder 11, the plate can be installed with a different angle in terms of gj ((f 45 .. .90) and a rake angle Jf (positive + J, zero at O, negative -J). depends on the size of the rake angle. For example, for a through cutter with an angle in the plane (f 90 ° and rake angle +6, the trailing angle varies within –2530). or treated surfaces.

The implementation of the invention allows to significantly expand the technological capabilities of the precast cutters, since the implementation of the cutting plate in the form of a regular tetrahedron makes it possible to create in each of the positions of the cutting plate not only additional cutting edges, but also a base for rigidly securely attaching the plate with any working cutting edge, and also allows one cutter to perform the operations of the groove on the generatrix, the bore hole and the detour along the contour

Claims (1)

Invention Formula The cutting multifaceted plate, made in the form of a regular tetrahedron, is characterized in that, in order to expand technological capabilities, the tops of the tetrahedron are formed by a sphere of radius R, the center of which lies in the center of the tetrahedron, and the radius is determined by b), where a is the length of the edge of the tetrahedron, b is a constant value in the range of 1-2 mm. r Phage. 2 12 eleven FIG. 3