RU1796361C - Face milling cutter - Google Patents

Abstract

Usage: the design of metal cutting tools, clean and precise processing of flat surfaces of the workpiece. SUMMARY OF THE INVENTION: An end mill comprises a housing, in the openings of which, on the holders interacting with the fixing elements, cutting inserts are mounted which are fastened with a screw and an elastic nut. The interacting surfaces of the holders and the locking elements are made spherical. The axis of the fixing screw passes through the center of the sphere formed by these surfaces. Mutually perpendicular slots are made on the nut. 4 ill.

Description

The invention relates to the construction of metal cutting tools and can be used in the finishing and precision processing of flat surfaces of the workpiece.

The aim of the invention is to increase processing productivity by reducing the setup time of the cutter.

In FIG. 1 shows a profile view of a milling cutter; in FIG. 2 - section of the cutter knot; in FIG. 3 - a cutting unit of a standard, standard cutting insert; in FIG. 4 is a section through a cutter assembly showing a cutting element of a conical shell shape.

The end mill has a housing 1 and cutting inserts 2 (Fig. 1). In addition, the section shows the holes of the stepped form 3 with the surfaces: chamfer 4, cylindrical 5 and 6, as well as the end surface of the hole 7. Four holes 5 serve to fix the cutter on the spindle faceplate.

The cutter nozzle is carried out through a smooth cylindrical hole 8, and the surface 9 is mated to the head of the threaded element of the centering and

holding housing 1. The surfaces 10 and 11 of the keyway are used to rotate the cutter.

The cutting inserts 2 are shown in contact with the machined surface 12. The improvement in the quality of the machined surface, at low feed per tooth, also depends on possible errors associated with the inaccuracy of the manufacture of the cutting tool. In a number of cases, this contributes not only to vibration absorption, but also to the mutual overlapping of the microprofile grooves from successive teeth of the tool,

In FIG. 2 shows a diametrical section of the incisal assembly. In addition to the surfaces of the cutting unit: chamfer 13, threaded hole 14, groove 15, conical surface 16 and spherical abutment surface 17, the retainer 18, the spherical holder 19 and the position of the vertices 20 and 21 relative to each other are certainly shown, the possible thickness of the steps between the 1st and the last cutting inserts marked with the letter a and equal to, for example, 1.8 mm. Here, the overshoot is indicated behind the arrow

WITH

x |

oh oh

CA

Oh i

Variable values of the angles aiu and the cut-off layer a. A spherical tool holder 19 is installed on the spherical surface 17 in the housing 1 from the malfunctioning end of the cutter into the hole 14 of the cutter assembly 19. In the tool holder 19, the cutting insert 2 is fixed with a screw 22; Self-locking with a nut 23 having a spherical surface 24 consistent with the spherical surface 25. J Moreover, the self-locking nut 23 has a volumetric fixation due to mutually perpendicular radial-axial slots 26 and 27.

For another embodiment of FIG. 4, it is possible to note the possibility of installing a conical shell cutter 2 fixed by a screw 22.

Milling cutter assembly

In the housing 1 there are holes 14 of cutter assemblies assembled in the following sequence. A spherical surface 19 of the tool holder is mounted on the spherical surface 17 of the opening of the cutting unit. Screws 22 and 22 are mounted in the tool holders. With their help, shell and cup inserts 2 and 2 are fixed. The cutting inserts are fixed in the tool holder by a self-locking nut 23 having a radial 26 and axial 27 slots located mutually perpendicularly, which, when compressed, fix the pressure the force of the screw head 22 (22) on the end surface of the cutting inserts 2 (2). The position of the plates in the part of the oriented vertex A is indicated by the numbers 20 and 21 and is due to a change not only in the thickness of the cut-off layer a (Fig. 2), but also in the installation angles

0

5

5

0

5

0

cutting inserts e.g. a. Finally, the position of the insert is fixed by the pressure nut 18.

The mill works as follows.

The assembled cutter design is mounted on a vertically milling machine using a mandrel, dowels and a beam fixed relative to surfaces 8-11. To fix the cutter on the horizontal milling machines, holes 3 with surfaces 4-7 are used. Four fastening screws pass through the holes 3.

A milling cutter mounted on a cutter of a certain cutting depth is informed of the main feed movement DS. After blunting, the inserts are set to a new profiling angle, for which it is not necessary to unscrew the nut 18.

The use of a face mill increases productivity by reducing the setup time of the mill.

Claims (1)

SUMMARY OF THE INVENTION A face milling cutter comprising a body, in the openings of which, on the holders interacting with the fixing elements, cutting plates are mounted, which are fastened with a screw, elastically interacting with the nut, characterized in that, in order to increase the processing productivity by reducing the time the settings of the cutter, the interacting surfaces of the holders and the fixing elements are made spherical, while the axis of the fixing screw passes through the center of the sphere formed by these surfaces, and nut designed mutually perpendicular slots; Figure 1 .J Axis srggy 20 21 FIG. 2.