SU988466A1 - Controllable tool for working holes - Google Patents

Description

(54) ADJUSTABLE TOOL FOR PROCESSING

one

The invention relates to the machining of metals, namely to tools for machining holes.

A tool for machining holes is known, having a mechanism for adjusting the diameter of tool 1.

The disadvantage of this tool is its inability to use it for machining the internal conical and stepped surfaces due to the lack of the possibility of adjusting the length and angle of the working part.

The purpose of the invention is the expansion of the technological capabilities of the instrument.

This goal is achieved by the fact that the mechanism for adjusting the parameters of the tool, ment (length and angle of the working part) is set to interact with the ends of the teeth, and the change in the length and angle of the working part is achieved by deforming the teeth in the axial direction.

FIG. 1 shows the proposed instrument, a general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 - axial section of varieties

anta performance of the proposed tool; in fig. 4 shows an embodiment of a tool tooth.

Adjustable tool consists of body 1, shank 2 and teeth having

5 cutting 3 and calibrating 4 parts. In the points of transition of the cutting parts 3 into the calibrating part 4, the recesses 5 are made. The same recesses 5 are made at the beginning of the cutting parts 3. The tool's tooth is evenly spaced around the circumference and can be made parallel, inclined or in the form of helical surfaces about the axis. The tooth is made either from the material of the body, or with attachment to them of cutting plates of tight fusible materials. The adjustment of the diameter D, the length L and the angle v of the working part of the tool is carried out by deforming the teeth in the axial direction by pressing the end of the teeth with a screw 6.

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When the tool is manufactured on the outer and inner surfaces of the tubular billet, recesses 5 are cut through, axially longitudinal grooves are made along the axis in the place of future chip grooves, and the billet is compressed in the axial direction. In thinned places, the teeth are bent and become trapezoidal. Then heat and / or heat treatment is performed. In the manufacture of an adjustable tool with arcuate teeth (Fig. 4), the recess can be omitted. The recesses 5 facilitate elastic deformation and ensure the fit of the teeth to the surface of the hole being machined.

To remove burrs from the inner surface of the billet, resulting from various types of machining, for example during drilling, a tool with an outer diameter D larger than the maximum inner diameter of the pipe is inserted into the hole. Under the action of radial forces, the tooth is compressed and, with the relative axial movement of the tool and the pipe, the burrs are removed, and during the reverse movement, additional cleaning of the edges of the intersection of the surfaces takes place.

With a tool with elastically deformable teeth, it is possible to work out parts whose internal diameter sizes fluctuate within the tolerance, the internal diameter of which is conical with a slight slope and even stepped if the drops are insignificant. When machining such surfaces, the diameter D, the length of the working part L, the angles of the intake cone h, the shape of the teeth and the width of the chip grooves change.

When removing burrs from inside surfaces, having their exact inside diameter, you can use the tool shown in FIG. 3. The diameter D of the tool

immediately adjusted to a hard size that does not change during operation. This type of tool can be used for machining holes, for example, when deploying, countersinking, etc. In this case

the space under the teeth is used as an additional volume of chip grooves. This circumstance is especially important when machining materials when a large amount of chips is formed, for example when machining long holes.

The proposed tool allows to increase labor productivity and quality of hole processing by expanding the technological capabilities of the tool.

Claims (1)

1. An adjustable tool for machining holes, comprising a housing, a shank, elastically deformable teeth arranged with radial movement and having cutting and calibrating parts, and a mechanism for adjusting the movement of teeth, characterized in that in order to expand technological capabilities by changing the length and angle the working part by deforming the teeth in the axial direction, the adjustment mechanism is installed with the possibility of interaction with the ends of the teeth. Sources of information taken into account in the examination 1. Patent of Germany No. 910020, cl. 49 from 27/04, publ. 1954.