SU1397192A1 - Arrangement for counter-boring holes - Google Patents

Abstract

The invention relates to metal cutting and can be used for machining edges in holes of body and fork-shaped parts. The aim of the invention is the expansion of technological capabilities by processing holes in hard-to-reach places. In two coaxially placed mandrels of 1 size

Description

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The cutting plates 2 are on common axes 4. On the mandrels there are mounted spring-loaded sleeves 6, which have a threaded surface. On sleeves 6, stops 10 are mounted so that they can be in contact with the external surfaces of the part, Countersinks 13 are mounted on threaded

sleeves 14 moving along the surface of sleeves 6. In sleeves 14 are placed pins rigidly connected with mandrels 1 and moving in slots made in sleeves 6, the cutting plates are placed in the windows of sleeves 6 with the possibility of interaction with their end surfaces. 4 il.

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The invention relates to metal cutting and can be used for machining edges in holes of body and fork-shaped parts.

The purpose of the invention is the expansion of technological capabilities by processing holes in hard-to-reach places.

FIG. 1 shows a device for countersinking of holes, a general view; in fig. 2 -.correction with tools, longitudinal section; in fig. 3 shows section A-A in FIG. 2; in fig. 4 shows a section BB in FIG. 2

The device consists of two bearings 1 placed in two spindles of cutting plates 2, installed in grooves 3 at the ends of mandrels 1 on common axes 4 and 5 bushings 6 entering in longitudinal windows, mounted on mandrels 1 and spring-loaded relative to the latter by means of a spring 7. The sleeves 6 have a threaded surface on which adjusting nuts 8 are installed with thrust bearings 9 mounted on them and stops 10 fixed by means of locking rings 11. Adjusting nuts 8 with stops 10 and bearings 9 are fixed by means of counter Ajki 12. Zenker 13 have a threaded hole and are mounted on sleeves 14, which have the ability to move along the surface of the sleeves 6 and are rigidly connected to the mandrels 1 by means of pins 15 placed in diametrically opposite slots 16 with the possibility of contact with the ends of the latter from the longitudinal windows 5 sleeves 6. In a predetermined position on the surface of the sleeves 14 countersinks 13 are fixed

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lock nuts 17. The adjustment of the device, taking into account the wall thickness, of the machined part is carried out by changing the relative position of the countersinks 13 on the sleeves 14 and the stops 10 on the sleeves 6.

The device works as follows.

The body or fork-shaped part is installed with holes coaxially with the spindle of the device. The spindles feed and rotate. Plate 2 on the initial position, i.e. pressed by the springs 7 by the outer and back sides, respectively, to the inner and outer edges of the end surfaces of the longitudinal windows 5, together with the mandrels 1. and the sleeves 6 are inserted into the holes of the part. When the stops 10 reach the surfaces of the part of the sleeve 6, while continuing to rotate, they stop moving in the axial direction. The mandrels 1, overcoming the force of the springs 7, continue their movements and lead the sleeves 14 with countersinks 13 by means of pins 15 to the edge of the holes. In this case, the plates 2 abut the back sides against the end surfaces of the longitudinal windows 5 of the sleeves 6 and, turning around the axes 4, as the mandrels 1 move in the axial direction, along with the countersink 13, they begin to chamfer the holes. Chamfering continues until the pins 15 come into contact with the end surfaces of the slots 16. bushings 6 from the side of the longitudinal windows 5,

When the spindles move in the opposite direction of the mandrel 1, they carry the sleeves 14 with countersinks 13 and 2 plates 2, which, turning around

axis 4, under the action of the spring 7, the back side is pressed against the outer, and the outer side against the inner edges of the end surfaces of the longitudinal windows 5 of the sleeves 6. When the device is unobstructed, it is removed from the back: ti.

Claims (1)

Invention Formula A device for countersinking holes in forked parts, comprising two coaxially placed mandrels carrying threaded bushings and countersinks that can be cooperated with cutting plates placed between countersinks, in order to expand technological capabilities, it is provided with additional threaded inserts sleeves with diametr radially implemented functions installed with the possibility of movement along the main bushings, which are made spring-loaded with pins placed in the grooves of the additional sleeves, rigidly connected to the mandrels and installed with the possibility of movement in the longitudinal slots that are embedded in the main bushings, mounted on the main bushings with the ability to move the stops intended for contact with the external surfaces of the part, and the countersinks are placed on the threaded surface of the additional bushings k, and the cutting plates are articulated in grooves, which are made on the ends of the mandrels facing each other, with the possibility of interaction with the face surfaces of the windows, which are made in the main bushings. J