RU192903U1 - Replaceable tool plate for hard turning - Google Patents

Abstract

The replaceable carbide plate of tungsten carbide for turning contains inserts of cubic boron nitride and an opening for its fastening on the cutter. Under the inserts, heat-removing cavities are made in the form of a quarter of a truncated cone, which ensure turbulization of the flow of coolant supplied under pressure, which allows to increase the cutting speed during hard turning, significantly reduce the temperature of the insert and increase the service life of the insert. 3 ill.

Description

The utility model relates to the field of mechanical engineering, namely to tools used for cutting metals.

Interchangeable polyhedral inserts are known that are used for turning tools, allowing them to be quickly replaced in case of wear or breakage, and quick tool setting (GOST 19042-80). Known replaceable carbide inserts with inserts of cubic boron nitride (CBN), manufactured by ISKAR, Sandvik, Seko and others.

The so-called solid turning is known, in which an increase in the turning speed in the absence of COTS leads to a significant increase in the temperature of the insert and its rapid wear, shortening the service life, especially when cutting high-strength materials.

To increase the service life of the inserts during hard turning, a system of internal cooling of the lower surface of the tool insert has been developed (utility model patent RU No. 181447), which provides liquid recirculation to dissipate heat and increase heat transfer to the medium to be cooled.

Known cutter with cooling the lower surface of the plate (patent for utility model RU No. 179894).

Known plates manufactured by ISKAR for hard turning. The plates have inserts of high-strength material (https://www.metalcuttingvision.com/iskar-automotive-ated-to-provide-advanced-tooling-solutions/).

The closest is a plate manufactured by Sandvik. The plate is made of tungsten carbide, has inserts of cubic boron nitride and a hole for mounting the plate on the tool (https://www.sandvik.coromant.com/ en-gb / industrysolutions / automotive / transmission / pages / cbn-insert-with- integral-chip-breaker.aspx).

Inserts made of cubic boron nitride can significantly increase tool life and surface quality, but when hard turning hard materials due to high temperatures, the cutting speed is limited and the service life of the inserts is reduced.

To increase the cutting speed during hard turning and the service life of the insert due to lower insertion temperature, a replaceable tool insert for solid turning from tungsten carbide is proposed, containing inserts made of cubic boron nitride and a hole for attaching it to the cutter; under the inserts, heat-removing cavities are made in the form of a quarter truncated cone, providing turbulization of the coolant flow.

Interchangeable tool inserts with inserts for hard turning, depending on the shape of the surface being machined and the processing conditions, can have various shapes: rectangular, triangular, diamond-shaped, etc. and various amounts of cubic boron nitride inserts.

In FIG. 1 shows a replaceable tool plate for hard turning. In FIG. 2 shows a replaceable tool plate for solid turning mounted on a cutter, top view. In FIG. 3 shows a diagram of the heat removal from the inserts of a replaceable tool plate with a flowing coolant, side view.

The replaceable tool plate for solid turning 1, made of tungsten carbide, contains a hole 2 for mounting it on the cutter 7, insert 3 made of cubic boron nitride, cavity 4 (for supplying coolant directly to inserts 3), providing heat removal from the inserts by a turbulent flow coolant. Under the inserts of the plate, cavities 4 are made in the form of a quarter of a truncated cone, the shape of which ensures turbulization of the flow of coolant supplied from the cooling system of the machine and increases the efficiency of heat removal. The cutter 7 contains channels 5 and 6 for supplying and discharging coolant into the cavity 4 of the replaceable carbide plate.

The work is as follows. On the cutter 7, a removable tool plate for solid turning 1 is fixed. Through channel 5, coolant is supplied to the cavity 4 of the plate 1 from the cooling system of the machine. The heated cooled fluid exits through channel 6 in the body of the cutter 7.

The use of the proposed interchangeable tool plate for solid turning allows you to significantly increase the cutting speed and increase the service life of the plate by reducing the insert temperature. The production of interchangeable tool inserts of the proposed design will enable import substitution of plates manufactured by ISKAR Germany and Sandvik from Sweden.

Claims (1)

A replaceable tool plate for solid turning, made of tungsten carbide, containing inserts of cubic boron nitride and having an opening for its fastening on the cutter, characterized in that under the inserts there are heat-removing cavities, the shape of which is in the form of a quarter of a truncated cone, providing turbulence of the flow supplied to coolant inserts.

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