SU1756036A1 - Face mill - Google Patents

Abstract

Use: metal-cutting tool. SUMMARY OF THE INVENTION: The end mill includes a body in which a groove with a cutting plate, which cooperates with the bottom of the groove and an adjusting screw, is installed on its axis on the axis. located at the bottom of the housing groove, and fasten it with a fastening screw. On the body there is an additional bevel, symmetrical to the main one. The cutter is equipped with a stop screw located between the adjusting screw and the axis of the holder. 8 il.

Description

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This invention relates to a metal cutting tool.

A known face milling cutter comprising pivoting clips mounted in a housing for adjusting the main coal in the plate. Moreover, the swivel clips are installed at an angle relative to the axis of the housing, and the knives are located at an angle relative to the axes of the swivel clips.

The disadvantage of this design is the difficulty of manufacturing the knife adjusting unit, as well as the need for its turning and additional alignment after turning the yoke around its axis.

An end mill is also known, consisting of a support part and a disk provided with an annular protrusion, on the periphery of which the cutting elements are mounted. The disk is fixed to the supporting part with the aid of a tightening element located in its center, and the annular protrusion located on the periphery of the disk contacts the supporting part so that a gap is formed between it and the disk, which ensures the deflection of the disk when tightening the screw 1.

The disadvantage of the design is the low rigidity of the angle of adjustment, which significantly affects the performance of cutting materials with reduced strength, as well as a small range of adjustment of the main angle in terms of a secondary angle in terms of p. In addition, the simultaneous adjustment of all cutting teeth requires high precision manufacturing of the components constituting the cutter.

Of the known structures of the end mills, the closest mechanical cutter of the Feldmühle company is the closest to the technical essence;

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in the groove of which, on the axis, there is a holder with a cutting plate, interacting with the bottom of the groove and an adjusting screw for adjusting the main p and auxiliary planar angles and secured with a fixing screw. It is used to obtain a high-quality surface with a low roughness. However, it has a small range of regulation of carbon in plan.

The aim of the invention is to expand the technological capabilities by increasing the range of adjustment of angles in the plan.

This is achieved by the fact that the end mill is equipped with an additional screw, placed in the holder between the adjusting screw and the axis of the holder, and an additional bevel, located symmetrically with the main one. The bevel angle can be determined by the formula

sin H / Lcos A,

where I is the distance between the tip of the cutting edge of the plate and the plane of rotation passing through the nearest point of the cutting edge to the axis of the cutter;

L is the length of the cutting edge of the plate;

And the angle of inclination of the cutting edge of the plate.

FIG. 1.2 shows a milling cutter in two positions: I - initial, required for setting up the milling cutter, and II - working; in fig. 3 is a view along arrow A in FIG. one; in fig. 4.5 is a diagram of changing the height of asperities h depending on the change of angles in terms of p and p; in fig. 6,7,8 - possible cases of the position of the cutting edge of the plate.

The milling cutter consists of a body 1 with a groove 2 bottom, a holder 3 with a cutting plate 4, an axis 5, a stop screw 6, an adjusting screw 7, fastening bolts 8, scales 9. The bottom of the groove 2 has two symmetrical bevels M and N. Screw 6 serves for returning the holder to the initial position I and creating a tension in the working position I. The adjusting screw 7 serves to set the specified angles in terms of pH p. The fastening bolts 8 are necessary for fixing the holder with the cutting plate in a predetermined position. The scale 9 serves to establish fixed angles in the plan.

Using the principle of setting the cutting edge of the plate when p is close to 90 °. a 1 to 0 °, requires high precision manufacturing of the cutter elements, since their errors lead to an increase in the height of asperities h (Fig. 3) of the machined surface during the cutting process.

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In the case of a - ip 90 ° and p & 0 °. In the case of b- and. A slight change in p from 90 ° and p from 0 ° leads to a significant increase in the height of asperities h. At the same time, depending on the physicomechanical properties of the material being processed, for example, when cutting viscous materials, processing with and is difficult, since traces of crushing and grazing appear on the surface, which degrades its quality and requires installation of different p from 90 ° and 0 °. Therefore, in order to obtain a high-quality surface with a low roughness, it is necessary to precisely maintain a predetermined position of the cutting edge of the plate. This is achieved by an additional adjustment, which is done by moving the holder 3 through the axis of rotation 5 by means of the adjusting screw 7 and the stop screw 6. To set the desired position of the cutting edge of the plate, for example, (p 0 °, the holder 3 is initially in the loose position Therefore, the cutting edge is oriented arbitrarily. In contact with the surface to be machined, there can thus be a tip D located closer to the mill axis, or the E. vertex located farther from the mill axis, and both at the same time (see Fig. 4, cases of a. b.c., respectively). Then, using a screw 6, the holder 3 is pressed against the bevel surface M. Screws 6 and 7 are in position I (Fig. 1).

Taking into account the calculated angle a, between the bevel surface M and the plane parallel to the axis of rotation of the cutter and the bevel passing through the top, the angle p in this position is approximately equal to the errors, and between the top of the edge E and the plane of rotation of the cutter passing through the point D, a guaranteed clearance remains, by measuring which with a probe, turning out the screw 6 and turning the adjusting screw 7 by the appropriate number of angular units indicated on the scale 9, achieve a setting of p 0 ° and p 90 °. When the screw 7 is rotated around its axis of rotation, it extends, pressing its spherical tip into the surface of the bevel M and thereby causes the holder 3 to rotate around the axis of rotation 5. Next, a small tension r is obtained by twisting 1-2 turns of the additional screw 6. In the case of the need for installation and, accordingly, the adjusting screw 7 is rotated by a larger number of angular units. As a result, the holder 3 continues to rotate around the axis 5, approaching its lateral surface to the bevel surface N. At the same time, the angles p are limited by the angle / between the bevel surface N and the plane passing through the bevel top parallel to the axis of rotation of the milling cutter. If it is necessary to move the holder in the opposite direction, the adjusting screw 7 is screwed out and screw 7 is screwed in contact with the bevel surface M. Thus, the main function of setting angles p and p is the screw 7. Since the tip of the screw 7 has a spherical surface, Changing the position of its axis does not affect the accuracy and range of adjustment. The screw 6 serves to return the holder 3 to its original position I and to create a tension in the working position II. In order for the screw axis 6 in the housing 1 to remain in a constant position, there is a gap between the screw surface and the surface of the holder, and as part of a spherical surface.

The bevel surface M allows the holder 3 to be installed with a guaranteed gap between the cutting edge of the plate and the plane of rotation, and thus using the additional adjustment to set the cutting edge in a predetermined position and with the required accuracy. From the location of the surface is symmetrical to the bevel N relative to the plane passing through the bevel apex parallel to the axis of rotation, i.e. the angle of / 3 depends on the adjustment range pw (p.

The outcome from practical conditions is that the angle / 3 is equal to the angle a. The angle a, calculated using the above formula, and based on the condition of creating a guaranteed gap with the possibility of its measurement, is 2-4 °. The size of the gap is 0.3-0.5 mm. Accordingly, the main angle in plan (p varies from 90 to 86 °, the auxiliary angle in plan p is from 0 to 4 °.

If the length of the cutting edge, 5 mm, size, 5 mm, the angle of inclination of the cutting edge A is 45 °, then

sin a

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0.043 and a 2 ° 30.

16.5 cos 45 ° The described design of the cutter allows you to expand technological capabilities by increasing the range

adjusting the angles in terms of p and p due to the interaction of the thrust 6 and adjusting 7 screws, as well as symmetrical bevels M and N. In addition, the presence of constant contact of the holder 3 with the top of the bevel of the bottom

0 slot 2 increases the rigidity of the holder mounting.

The milling cutter makes it possible to obtain the roughness of the treated surfaces up to 32 .. 0.63 µm on various materials, including hardened steel, where machining with standard mills with tungsten-containing hard alloys is impossible. It is also used instead of a flat grinding operation. And

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for processing, it is enough to have one tooth. The productivity at the same time increases by 4 times in comparison with processing by standard mills and by 6 times in comparison with flat grinding. Saving costly tooling materials, laboriousness in the manufacture of cutters is reduced.

Claims (1)

Invention Formula A face milling cutter comprising a body, in a groove of which, on an axis, a holder with a cutting plate is installed, interacting with the bottom of the groove and an adjusting screw located on the bevel of the bottom of the housing groove, and fixed by means of a fixing screw, characterized in that, in order to expand technological capabilities by increasing the range of adjustment of angles in the plan, a cutter is inserted into the mill a stop screw located in the holder, while at the bottom of the housing groove an additional bevel is made symmetrically to the main one, and said stop screw is located between adjusting screw and the axis of the holder with the ability to interact with the main bevel at the bottom of the housing groove.  H 1 J3 Fig H 90; ЈЈ0 ° phage, 4 axis cutters. F f FIG. 6 Stita Fig.Z ifsSO9, FIG. five Mill axis & 1 v cutter axis one F Ј Ј. e FIG. eight