SU1745438A1 - End cutting tool - Google Patents

Abstract

Use: metalworking. Processing of parts from steel and cast iron. SUMMARY OF THE INVENTION: The tool comprises a mandrel, an insert, and a cutting insert. The insert has protrusions with an inner conical surface for engagement with an outer conical surface formed on the cutting insert. 4 il.

Description

This invention relates to metalworking and can be used in the machining of steel and cast iron parts.

Radial concave cutters with a tapered shank are known, where the cutting plate is attached to the mandrel by welding with a butt fusion.

The disadvantage of this cutter is that the mandrel is used only once. Thus the mill has a short service life. Material consumption is also greatly increased, since different mandrels are needed for different plates.

The closest technical solutions to the present are feather core drills, which are chosen for the prototype, containing a cutting insert secured in the holder with the aid of a cylindrical screw.

The drawbacks of such drills are low positioning accuracy (the occurrence of vibrations, since the cutting plate is clamped between the thin plates) and the lack of reliability of attachment.

The aim of the invention is to increase the service life of the tool by increasing the reliability of fastening the cutting insert.

This goal is achieved by inserting a end cutter comprising a mandrel in which a cutting plate is fixed with a tightening nut, an insert is placed in a hole made in the mandrel and having two projections with an inner conical surface intended to interact with the outer conical surface made on the cutting plate.

The accuracy of the base on the cone is much higher than on the cylinder, so the reliability of mounting the cutting plate increases dramatically. When operating the tool, the reliability of the attachment of the cutting plate is very important. This factor affects all the parameters of the milling process, and ultimately the tool life. In addition, material consumption is reduced by reducing the number of mandrels (in known tools, a mandrel was needed for each cutting plate).

FIG. 1 shows the end cutting tool in the form of a concave radius cutter, front view; in fig. 2 - the same, top view; in fig. 3 - insert, applied

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for fastening the cutting plate, front view; in fig. 4 - the same, top view.

The concave radius cutter includes a cutting insert 1, an insert 2 for fastening the cutting insert, a tightening nut 3 and a holder 4.

The proposed tool works as follows

Insert 2 is pressed into the cutter bar. A desired radius of the cutting insert 1 is selected for machining this part.

The cutting insert 1 is inserted into the mandrel and clamped with a tightening nut 3. A concave radius cutter is placed on the mill and boring group or on the CNC machine. After the cutter is installed, the work is carried out in the usual way.

The use of a concave radius cutter allows to increase the service life by 5 times due to the increased reliability of fastening and to increase the accuracy of processing by 2 times due to the fact that movements are eliminated

cutting plate. Due to the fact that the conic part of the cutting plate rests on the inner, conical insert surface, there is no movement of the plate in

transverse direction, and there is no radial runout. In addition, the clamping nut (screwed in) does not allow the plate to move along the vertical axis.

Ph o rmul a and z o b rete n i

An end cutting tool comprising a mandrel in which a cutting plate is fixed by means of a tightening nut, characterized in that

In order to increase the service life by increasing the reliability of fastening the cutting plate, an insert is inserted into the tool, placed in a hole made in the mandrel, and having two protrusions with an inner conical surface designed to interact with the outer conical surface made on the cutting plate.

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figure 1

FIG. 2

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Claims (1)

10 FORMULA AND PORTRAIT An end cutting tool comprising a mandrel, in which a cutting insert is fixed with a tightening nut, characterized in that, in order to increase the service life by increasing the reliability of fixing the cutting insert, an insert is inserted into the tool located in the hole made in the mandrel, and having two protrusions with an inner conical surface, designed to interact with the outer conical surface, made on the cutting insert.