SU1764860A1 - Face-milling cutter - Google Patents

Abstract

Use: metal cutting. Milling or milling surfaces. SUMMARY OF THE INVENTION: The milling cutter comprises a housing with a conical end and cutting inserts arranged along the turns of an Archimedean spiral. Additional cutting inserts are located with equal pitch between cutting inserts with a maximum radius of distance from the mill axis. This reduces the load on the inserts working on the crust. 4 il.

Description

The invention relates to the field of metal cutting and can be used as an end mill for milling or milling surfaces.

Known cutters used for machining planes,

Closest to the claimed technical solution is a milling cutter comprising a body having a working end in the form of an outer cone, coils of cutting inserts and elements of their fixation mounted on it along an Archimedean spiral.

However, the device has a significant drawback, which reduces the operational capabilities of the cutter, namely the rapid exit from the cutting inserts, the first to come to work when cutting on the crust.

The purpose of the invention is to expand the operational capabilities of the cutter by reducing the load on the inserts working on the crust.

This goal is achieved by the fact that the cutter comprising a body with a conical

The end, in the slots of which, located along the coils of the Archimedean spiral, is installed cutting inserts fixed with fixing elements, provided with additional cutting inserts working to the crust placed at equal pitch on the body between cutting inserts with maximum radii of distance from the mill axis. Installing additional cutting inserts at a maximum radius of removal from the axis of the cutter allows you to unload the teeth, the first to come into operation during cutting and work on the crust by reducing the removed allowance, the arrival of each of the inserts.

FIG. 1 shows a general view of the cutter from the working surface; figure 2 - General view of the cutter from the rear surface; on fig.Z - section aa in figure 1; figure 4 - section bb in figure 1.

The face milling cutter contains a body 1 installed in the sockets 2 of the body located along the turns of the Archimedean spiral, cutting inserts 3. The body has grooves 4 in which the balancing weights 5 s are installed

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with

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about

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about

fixing elements 6. In the cutter body there are special sockets 7 for additional cutting inserts 8. A wedge 9, differential screws 10 and set screws are provided for fixing the cutting inserts.

The device works as follows.

When preparing the cutter for operation with the help of adjusting screws, the working flights of the cutting inserts 3 and the additional cutting inserts 8 are installed. The cutting inserts 3 are installed in the sockets 2 up to the stops, which are used by the screws and clamped by wedges 9, having a conical part with a cone angle equal to self-locking angle of 7 °. When tightening the wedges 9, they move along the conical part of the housing 2 sockets, also made at an angle of 7 °. The cutting inserts 3 are fixed by tightening the wedges 9 by means of differential screws 10. Additional cutting inserts 8 are fixed in the sockets, and their overhang is equal to the cutting insert's reach as far as possible from the cutter axis. Static balancing of the milling cutter is performed on the stand. For this, the balancing weights 5 are installed in the grooves 4, made in the form of a dovetail, by moving which the cutter unbalance is eliminated. Balancing weights are fixed in the lower position with screws 6.

When milling, the cutting insert, which is at the maximum radius of distance from the mill axis and the additional cutting inserts, come into operation first.

8. The presence of several cutting inserts located at a maximum radius of distance from the mill axis will relieve the cutting insert working along the crust and thereby increase the resistance of the cutting inserts to the next regrinding or replacement of non-removable cutting inserts. The machining allowance is broken so that each cutting insert removes the same allowance. However, the cutter design permits the installation of cutting inserts 3 in such a way that each insert removes its allowance for processing, different from the allowance, for the arrival of the cutter on the other teeth. Thereby, it is possible to take into account the fact that all the cutting inserts of the stepped face milling cutter work with different cutting speeds. The use of a differential setup for installing overhangs of cutting inserts allows an increase in the life of the cutter between regrindings.

Claims (1)

The invention of the Tortsov cutter, comprising a body with a conical end, in the slots of which are arranged along the turns of the Archimedean spiral, is installed cutting inserts fixed by means of fixing elements, in order to expand technological capabilities by reducing the load on the inserts, working on the crust, additional cutting inserts are inserted into the mill, placed at equal pitch on the body between the cutting inserts with maximum radii of distance from the mill axis.  t5 "O .Fmg2 Fig.Z W