SU1158299A1 - Tool for machining holes - Google Patents

Abstract

TOOL HANDLING TOOL, comprising a housing with cutting elements accommodated therein with the possibility of radial movement by means of a core mounted inside the housing that can be rotated, characterized in that, in order to expand the technological capabilities of the tool and increase the machining accuracy, by compensating for wear of the cutting elements in the process cutting, the tool is equipped with a double-sided deforming element, fixed in a diametral groove, and a torsion roller m, connecting said core with the housing, wherein the side surface of the core is in the form of an Archimedean spiral portions among the cutting elements.

Description

Jf

A-A A

FIG. 1 The invention relates to metal working, in particular to the finishing of holes. The purpose of the invention is to expand the technological capabilities of the tool and increase the machining accuracy by compensating for the wear of the cutting elements during the cutting process and by damping the oscillations of the smoothing moment by the torsion roller. FIG. Figure 1 shows schematically the proposed tool for machining holes, a general view; in fig. 2 is a section A-A in FIG. 1, the original position; in fig. 3 - the same position when the cutting elements are worn; in fig. 4 - section BB; in fig. 5 shows an embodiment of the tool with cutting elements mounted on. elastic petals of the shell; in fig. 6 shows a section B-B in FIG. 5j in Fig. 7 is an embodiment of a tool with a deforming element made in the form of a cylindrical strip; on Fig - vi G figure 7. The tool for machining the hole includes a housing 1, in the radial grooves 2 of which the cutting elements 3 are interconnected, which cooperate with non-working ends 4. With the lateral surface 5 of the core 6 installed with the possibility of rotation in the central part of the 7 of the housing 1. The core 6 is made through diametrically a groove 8 in which a deforming element 9 is installed, embodied in the form of a plate with a hard-alloy peripheral part. The core is connected to the body 1 by an elastic element in the form of a torsion roller 10, the elastic force of which is opposite to the Smoothing Moment. The lateral surface 5 of the core is made in the form of sections of the Archimedean spiral by the number of cutting elements 3. In the latter there are cuts 11 in which pins 12 are placed, supported on elastic elements 13 and fixed in holes 14 of the housing 1 Cutting elements 3 can be fixed in recesses 15 of the elastic petals 16 of the housing 1, the protrusions 17 of which are in direct contact with the lateral surface 5 of the core 6. The deforming element can be made in the form of a cylindrical 992 roller 18 mounted in an inclined hole 19 of the heart chnika 6 rotatably around its axis. During the hole machining process, the workpiece is rotated and the axial feed is communicated to the tool. The tool removes the allowance with the cutting elements 3 and then smoothes the surface to be treated with the deforming element 9. At the same time, the tops of the cutting elements 3 advance the deforming element 9 in the direction of axial feed by an amount not exceeding half the feed. After cutting into the workpiece, the cutting forces and the smoothing forces are stabilized. Under the action of the smoothing forces acting on the deforming element 9, the core 6 rotates at a certain angle T, twisting the torsion roller 10 and extending the side surface 5 of the cutting elements 3 to a size corresponding to the size of the deforming element 9. When the cutting elements 3 blunt, the smoothing allowance increases. consequently, the smoothing moment increases, under the action of which the deforming element 9 together with the core 6 rotates by a certain angle C, and the cutting elements 3 extend the lateral n 5 Used core surface by the amount of wear. The 5p "smoothing allowance is reduced, therefore, the smoothing moment is reduced and the cutting process is stabilized. In the process 8 {4Movement of the cutting elements 3, the elastic elements 13 are compressed, which are located in the slots x 11. Thus, the cutting elements 3 are constantly pressed with their non-working ends w 4 to the side surface 5 of the core 6. The elastic torsion roller 10 returns the core 6 when reducing the moment of smoothing. In the case of a tool with cutting elements 3, installed I on the elastic petals 16 of the housing 1, as the smoothing moment increases, the said elastic petals 16 are squeezed, and together with them the cutting elements 3 move, until their wear is compensated, and the smoothing and cutting forces are stabilized. In the case of using a cylindrical

roller 18, works as a single roller rolling, rotating around its axis in the aperture 19 of the core 6 when interacting from two sides with the rotating workpiece. When the cutting elements 3 are worn, the tension increases and, consequently, the smoothing moment acting on the roller 18 increases. As a result, the core 6 is rotated, the wear of the cutting elements 3 is compensated, and the forces are smoothed, and the cutting forces are stabilized. In order to avoid spontaneous backward movement, the pressure angle cС in the kinematic pair core 7

the cutting element is made smaller than the friction angle. Then the radius vector of the Archimedean spiral is determined from the expression:. .

R - & - l J

% -tg

n - ss mmarnaya amount of compensation for the wear of one cutting element;

H is the current angle of rotation of the core;

ff- the maximum possible rotation angle of the core;

L, is the angle of pressure, in a clad core pair of core-cutting element .;

Sh

6

ig.2

Claims (1)

TOOL FOR HOLE TREATMENT, comprising a housing with cutting elements placed therein with the possibility of radial movement by means of a core rotatable installed inside the housing, characterized in that, in order to expand the technological capabilities of the tool and increase the accuracy of processing, by compensating for wear of the cutting elements in the cutting process, the tool is equipped with a two-sided deforming element fixed in a diametric groove made in the core, and a torsion roller, soy 'dyinuyu core with the housing, and the lateral surface of the core is made in the form of sections of the Archimedean spiral by the number of cutting elements.' in FIG. 1 Joint venture 00 ju 00