RU2634335C1 - Combined cutting tool - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: tool comprises a twist drill and connected holder-type counterbore with a body in which slots there are two cutting plates interacting with the supporting walls on the working part of the drill. The drill supporting walls are made in the form of two flats parallel to the drill axis and cross one of the cutting grooves. The body is provided with support platforms, benches and a slit for elastic convergence and separation of support platforms. Each cutting plate has the form of an isosceles right triangle with opposite front and bottom bearing surfaces in a plan view. Cutting edge of each cutting plate is located at the intersection of the front surface with the rear surface inclined toward the side support surface for interacting with the drill flat. Between the front and the lower support surface, there is a fastening hole to fix the cutting plate in the slot of the holder-type counterbore body.

EFFECT: expanded technological possibilities for holes processing.

8 dwg

Description

The invention relates to the field of processing materials by cutting, in particular to a combined cutting tool for drilling holes and chamfering.

Known combined cutting tool containing a spiral drill with two chip grooves, having a working part and a shank, and a countersink for chamfering in the machined hole, connected to the aforementioned spiral drill and containing a housing, in the nests of which are installed two cutting plates interacting with the supporting walls on the working part of the drill (see, for example, Japanese application JP 2006-043868, B23B 51/08, 2006).

The scope of the known combined cutting tool in terms of reducing the diameter of the machined hole is limited due to the implementation of the countersink body of two halves connected by screws. The objective of the invention is to expand the technological capabilities of the combined cutting tool by reducing the diameter of the machined hole.

The problem is solved in that in a combined cutting tool containing a spiral drill with two chip grooves, having a working part and a shank, and a countersink for chamfering in the machined hole, connected to the said spiral drill and containing a housing, in the nests of which two cutting plates interacting with the supporting walls on the working part of the drill, according to the invention, the supporting walls of the drill are made in the form of two flats parallel to the axis of the drill and crossing each one made of chip grooves, while the casing is made with supporting platforms for interacting with the said flats, ledges adjacent to both flats on both sides, and a slot for elastic mixing and breeding of the said flats, with each cutting insert being made in plan view in the form of an isosceles a right-angled triangle with opposite front and lower supporting surfaces, between which, on the hypotenuse of the isosceles right-angled triangle, there is a back surface and two sides bearing surfaces, one of which is designed to interact with the flat of the drill, and the other with the side support wall of the housing socket, the cutting edge of the cutting insert is located at the intersection of the front surface with the rear surface with an inclination towards the side of the supporting surface for interaction with the flat of the drill, between the front surface and the lower supporting surface passes a mounting hole for accommodating the mounting screw for fixing the cutting plate in the socket of the housing of the countersink.

The proposed combination cutting tool is shown in FIG. 1-8, on which:

in FIG. 1 is a side view of a combination cutting tool;

in FIG. 2 is a left view of FIG. one;

in FIG. 3 shows section AA in FIG. one;

in FIG. 4 shows a section BB in FIG. 2;

in FIG. 5 shows a section of a chamfered hole machined with a combined cutting tool;

in FIG. 6 is a plan view of a cutting insert;

in FIG. 7 is a left view of FIG. 7;

in FIG. 8 is a top view of FIG. 7.

The combined cutting tool contains a spiral drill 1 with two chip grooves 2, having a working part and a shank 3, and a countersink for chamfering in the machined hole, connected to the said spiral drill and containing a housing 4, in the sockets of which two cutting plates 5 are mounted, interacting with supporting flanges 6 on the working part of the drill.

The flats 6 are made parallel to the axis of the drill and each intersect one of the chip grooves 2. In this case, the housing 4 is made with supporting platforms 7 for interacting with the mentioned flats 6, ledges 8, adjacent to both flats on both sides, and a slot 9 for elastic mixing and breeding said sites 7 are relatively bald 6 with a key.

Each cutting insert is made in plan view in the form of an isosceles right-angled triangle with opposite front 10 and lower supporting 11 surfaces, between which, on the hypotenuse of the said isosceles right-angled triangle, is located the rear surface 12 and on the legs, two lateral supporting surfaces 13, one of which is intended for interaction with the flat 6 drill, and the other with the side support wall of the housing socket.

The cutting edge 14 of the cutting insert is located at the intersection of the front surface with the rear surface with an inclination towards the side supporting surface for interaction with the flat of the drill for its location in the axial plane of the drill.

Between the front surface and the lower abutment surface, a mounting hole extends to accommodate the mounting screw 15 for securing the cutting insert in the socket of the countersink body.

The implementation of the housing of the countersink with the possibility of mixing and breeding the supporting platforms relative to the flats of the drill allows to reduce the size of the housing and cutting inserts, thereby expanding the technological capabilities of the combined cutting tool in terms of reducing the diameter of the machined hole.

Claims (1)

Combined cutting tool containing a spiral drill made with a working part, a shank and two chip grooves, and an assembly countersink for chamfering the machined hole, connected to the said spiral drill and containing a housing, in the sockets of which two cutting plates interacting with the supporting walls are installed on the working part of the drill, characterized in that the supporting walls of the drill are made in the form of two flats parallel to the axis of the drill, each of which intersects one of the chip grooves, and the casing is made with supporting platforms for interacting with said flats, ledges adjacent to each flat on both sides, and a slot for elastic information and breeding of said supporting platforms, with each cutting insert being made in plan view in the form of an isosceles right triangle with opposite front and the lower supporting surfaces, between which, on the hypotenuse of the isosceles right triangle, the rear surface is located, and on the legs, two lateral supporting surfaces spans, one of which is designed to interact with the flat of the drill, and the other with the side support wall of the housing socket, and the cutting edge of each cutting insert is located at the intersection of the front surface with the rear surface with an inclination towards the side of the support surface to interact with the flat of the drill, and between the front surface and the lower supporting surface, a mounting hole is made for the mounting screw to secure the cutting insert in the socket of the countersink body.

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