RU206320U1 - Spiral double-start conical cutter - Google Patents

Abstract

The utility model relates to the processing of materials by cutting and can be used in the jewelry industry when processing jewelry wax. The spiral two-thread conical cutter contains a shank and a cutting part with helical teeth, separated by flutes for chip flow. On the surface of the shank at the point of clamping of the cutter in the chuck, counter notches are made, located at an angle of 45 ° to 75 ° to the longitudinal axis of the cutter. In the area of notching, the shank contains a nitride layer in the form of a film with a thickness of 0.3 mm to 0.6 mm. Increasing the coefficient of friction of the shank when it is secured. 1 ill.

Description

Technology area

The utility model relates to the jewelry industry and can be used in the processing of jewelry wax.

State of the art

Known device end milling cutter. The end mill is made of monolithic metal ceramics and contains a shank, a cutting part with helical teeth separated by grooves for chip flow, an end face of the cutting part having a shape consisting of an undercut and an angular radius. The rake angle of the peripheral cutting teeth is -10є. The value of the rake angle of the end teeth of the cutting part is 0є (patent RU No. 179047, IPC B23C 5/10, published on 25.04.2018 Bull. No. 12).

The disadvantages of the known device is the insufficiently high coefficient of friction at the point of clamping of the cutter.

The closest device is a milling cutter containing a cutting part in the form of a truncated cone, passing into a cylindrical shank, and contains two cutting teeth, each of which is located along a helical spiral with an angle of rise of 30 ° and has front and rear surfaces made at an angle of inclination of 30 ° and 60 °, respectively, with the formation of a profile of the cutting edge in the form of a rhombus. The end of the cutting part is made with an undercut intersecting the said front and rear surfaces to form a cutting edge (patent RU 2736622, IPC B23C 5/10, published on November 19, 2020 bull. No. 32).

The disadvantages of this device is the insufficiently high coefficient of friction at the point of the cutter clamping.

Disclosure of a utility model

The technical result is to increase the coefficient of friction of the shank.

The present technical result is achieved in the device, a spiral double-start conical cutter containing a shank and a cutting part with helical teeth separated by grooves for chip flow, and on the surface of the shank at the point of clamping of the cutter in the chuck, notches are made by creating counter notches made at an angle of 45 ° to 75 ° to the longitudinal axis of the cutter, the shank in the area of notching contains a nitride layer in the form of a film with a thickness of 0.3 mm to 0.6 mm.

The hallmarks are

notches are made on the surface of the shank at the point of clamping of the cutter in the chuck by creating counter notches made at an angle of 45 ° to 75 ° to the longitudinal axis of the cutter, this technical result is achieved due to the effect of metal jamming by the notches forming corners on the surface of the shank of the cutter with the metal of the chuck , thereby increasing adhesion;

the shank in the area of notching contains a nitride layer in the form of a film with a thickness of 0.3 mm to 0.6 mm, which makes it possible to increase its wear resistance, hardness and, as a consequence, increase the service life of the cutter.

Comparison of the proposed solution with analogs and the prototype did not allow to identify in them the features that distinguish the proposed solution, which allows us to conclude that the criterion of "novelty" is met.

Brief Description of Figures

The claimed utility model is illustrated in the figure, which shows a frontal view of a spiral double-start cone cutter containing 1 - a shank, 2 - a working part, 3 - counter notches, 4 - an area of a nitride layer in the form of a film.

Implementation of the utility model

The manufacturing technology of the proposed device is similar to that of the prototype. The application of notches 3 on the cylindrical shank 1 is performed with a special cutter on a lathe in one and the other direction with the same speed of advancement of the cutter along the cutter shank, both from left to right and from right to left.

After applying the notches 3 on the same machine, the notched shank is calibrated, corresponding to the processing quality of the notched shank, in order to eliminate the imbalance caused by the notching.

Shank surface treatment with nitriding consists in saturating the surface layer of the part with nitrogen. Nitriding is carried out at 500-600 ° C in a hermetically sealed iron container, which is introduced into the furnace. It is heated to a temperature corresponding to the selected mode, and the required time is maintained. Parts that will be nitrided are placed in the container.

Ammonia is launched there under a certain pressure, which, under the action of high temperatures, dissociates into hydrogen and atomic nitrogen, which in turn penetrates into the surface layer of the soft metal, forming nitrides with the elements that make up the composition, steel, aluminum, chromium, molybdenum. They have a high hardness. At the end of the procedure, the furnace is gradually cooled along with the flow of ammonia.

The thickness of the nitride layer 4 can vary from 0.3 mm to 0.6 mm. Thus, there is no need for subsequent heat treatment in order to increase the strength characteristics [3].

The spiral double-start conical cutter, according to the utility model, works as follows.

The cylindrical shank 1 of a spiral double-start conical cutter is placed in a chuck and crimped with its jaws on three sides at the place where the notches are applied 3 with a key from one slot and for control from the second and third. Counter cuts 3 on the shank 1, applied at an angle of 45 ° to 75 ° to the longitudinal axis of the cutter, ensure jamming of the cutter in the metal of the chuck jaws by creating a large number of acute-angled figures on the surface of the shank that can multiply the coefficient of friction of the cutter shank, and the nitride layer in the form film 4 increases the coefficient of friction of acute-angled figures.

Sources of information

1. Patent RU No. 179 047 IPC B23С 5/10 (2006.01), published on 25.04.2018 Byull. No. 12);

2. Patent RU No. 2 736 622 IPC B23С 5/10 (2006.01), published on November 19, 2020 Byull. No. 32;

3.http: //met-all.org/obrabotka/himicheskaya/azotirovanie-stali-metalla-ionnoe.html.

Claims (1)

The cutter is a spiral double-start conical, containing a shank and a cutting part with helical teeth, separated by grooves for chip flow, characterized in that on the surface of the shank at the point of clamping of the cutter in the chuck, counter notches are made, located at an angle of 45 ° to 75 ° to the longitudinal axis of the cutter , while the shank in the area of application of incisions contains a nitride layer in the form of a film with a thickness of 0.3 mm to 0.6 mm.

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