SU1692757A1 - Mandrel - Google Patents

Abstract

This invention relates to metalworking and can be used to fasten parts. The purpose of the invention is to improve the fixing accuracy by selecting gaps in the conjugation of the tapered bushing. A collet 2 is mounted on the surface of the housing 1, the cone sleeve 3, in the hole of which cams 4 are installed, which are moved by the tapered surfaces of the grooves 11 of the rod 5 moved by the clamping nut 8. After installing the fixed part, rotating the nut 8, the cone sleeve 3 is displaced, and the rod 5, unclenching the collet 2, selects the gaps in conjugation of the tapered bushing 3. The part is fastened. 3 il.

Description

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This invention relates to the field of metalworking and can be used to fasten parts.

The purpose of the invention is to improve the accuracy of fixing by selecting gaps accompanied by a tapered sleeve:

FIG. 1 shows the mandrel, a common id; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. 2

The collet mandrel consists of a body 1 with a tapered surface to expand the double-sided collet 2, a tapered bushing 3 mounted on the surface of the body 1 in a Free fit, three cams A located in the grooves of the body 1, a rod 5 with a spring 6 that is located in the opening of the body 1 and is centered relatively to it by holes in the housing 1 and the guide sleeve 7 fixed in the housing 1, the clamping nut 8, in the groove of which the pin 9 installed in the hole of the rod 5 and the adjusting nut 10 are placed.

The rod5 with its conical surfaces of the grooves 11 contacts with mating conical surfaces of the cams 4 placed in the grooves of the housing 1 and intended to interact with the internal one. the surface of the sleeve 3.

Collet mandrel works as follows.

The collet mandrel is attacked to pre-adjust the position of the rod 5, which is fixed by the adjusting nut 10, limiting its axial movement.

After adjusting the position of the stem 5, the tapered bushing 3 is removed from the body 1 of the mandrel with preliminary removal of the pin 9 and the clamping nut 8. Then the collet 2 and the code nous bushing 3 are mounted on the housing 1, the clamping nut 8 is turned until the unclamping of the petals of the collet 2 begins, and in position csm pin 9 is installed in the hole of the clamping nut 8 and the rod 5.

After adjustment, the collet mandrel is installed in the machine spindle, the clamping nut 8 is slightly released, and the tapered bushing 3 is retracted.

To secure the part, the tapered bushing 3 is moved by the clamping nut 8 in the direction of the extension of the cams 4, which is carried out by moving the rod 5 by means of a pin 9 installed therein, abutting the inner groove of the clamping nut 8 and the spring 6.

By moving the tapered bushing 3, the petals of the collet 2 unclench and the part is secured. In doing so, the adjusting nut 10 rests on the end of the body 1, whose position is adjusted during the adjustment process. Simultaneously with the movement of the tapered bushing 3, the clamping nut 8 moves the rod 5, uniformly unclenches the cams 4 and selects all the gaps. The end of the stem 5 mates with the centering hole in the housing 1 and in the guide sleeve 7, ensuring that the cams 4 are evenly opened

relative to the axis of the mandrel.

To unseal the collet 2 of the workpiece cut, it is necessary to loosen the clamping nut 8 slightly, and when the clamping nut 8 is turned off, the pin 9 moves the rod 5 towards the unclamping of the cams 4. The adjusting nut 10 together with

the rod 5 moves away from the end of the housing 1. After the cams 4 are opened, the tapered sleeve 3 is VODITSYZ of the collet, and the workpiece is removed from the mandrel,

Due to the uniform selection of the gap in

mating the tapered bushing 3 with the housing 1 centering the tapered bushing 3 relative to the axis of the mandrel and thereby achieving a uniform expansion of the collet 2, ensuring high accuracy of fixing

the details.

The proposed design of collet chucks provides precise centering of the workpiece, which eliminates the occurrence of errors in the form of radial and face beats.

Claims (1)

Claims of the invention The collet mandrel, on the surface of the casing of which there is a double-sided collet, is a spring and a movable taper bushing in contact with a nut, characterized in that, in order to increase the fixing accuracy, the mandrel is provided with a stem with conical grooves and a hole installed in the housing. openings, and cams, which are located in grooves made in the housing and designed to interact on one side with the internal opening of the tapered bushing, and on the other, with tapered grooves the stem, the nut is made with an internal bore designed to accommodate a pin inserted into the mandrel, fixed in the stem hole, and a spring is located between the pin of the stem and inserted into mandrel sleeve mounted in the housing. Aa FIG. 2 Fig.Z