SU1220875A1 - Collet chuck - Google Patents

Description

This invention relates to metalworking and can be used to fasten various parts.

The purpose of the invention is to improve the fixing accuracy by ensuring uniform distribution of the securing forces.

Figure 1 shows the collet chuck; Fig. 2 shows a section A-A in Fig. 1 (with a clamped part having an oval outer surface); on fig.Z - section bb in figure 1; figure 4 is a view In fig 1.

The collet chuck consists of case 1, the front part of which is made in the form of a cylindrical collet 2 with a socket 3 for the workpiece 4, on the outer surface of the collet 2 there is an annular collar 5 for the groove 6, made on the inner surface of the pressure element in the form of levers 7, on the outer surface of which is filled with a groove 8 under the clamping ring 9 held by a pin 10 installed by the Pa of the outer surface of the levers 7. On one side, the levers 7 are in contact with the outer surface of the petals 11 of the collet 2, and the opposite bevels pins with a conical surface 12 of the sleeve 13, which is mounted on the groove movably in the axial direction on the outer surface of the housing 1.

The conic surface 12 is a surface divided into areas having different inclination to the outer surface of the housing, which determines the different inclination of the levers 7, and hence the different deflection of the petals 11. The inclination of the sections of the conical surface 12, their length, is determined by in accordance with the profile of the outer surface of the workpiece 4 and the guaranteed clamping of the petals 11 of the collet 2 of the workpiece 4. These values can be determined both by calculation and experienced. The end surface 14 of the sleeve 13 interacts with a nut 15, which provides movement of the sleeve 13 to the shoulder 16 of the lever 7. The surface of the shoulder 16, which interacts with the conical surface 12 of the sleeve 13, may be different, for example, oval.

The workpiece 4 is clamped in the following manner.

The levers 7 are mounted on the collar 5, into the groove 8 of which a fastening ring 9 is installed, after which the holes 17, made in the levers 7,

pins 10 are mounted, reversing the displacement of the clamping ring 9. To eliminate movements of the levers 7 along the collar 5, the pins 10 are mounted in the grooves 18 made on the fastening ring 9. Thus, the levers 7 are fixed relative to each other.

The levers 7 are fixed relative to the sleeve 13 by means of pins 19 mounted on a conical surface 12, ensuring that the sleeve 13 is located relative to the tips 7.

Next to the housing 1 is installed

the sleeve 13, so that its conical surface 12 is in contact with the shoulders 16 of the levers 7. After this, the nut 15 is installed. In the socket 3 of the collet 2, the processed

detail 4, for example, having an oval outer surface. The combination when installing parts 4 of the profile of the sleeve 13 and the workpiece 4 can be carried out in various ways

for example, according to the risks that fix the maximum protrusion on the surface of the sleeve 13 and the smallest diameter of the workpiece 4.

When screwing the nut 15, the sleeve 13 moves along the surface of the housing 1 and the tapered shaped surface 12 acts on the shoulders 16 of the arms 7. The latter, with their opposite shoulders, lean on

shoulder 5, press down the petals 1I of the collet 2, cause them to bend in accordance with the specified profile of the sleeve 13, and clamp the workpiece 4. To ensure a constant fastening moment on the workpiece 4, the nut 15 is pressed. To avoid cases of unscrewing the nut 15 during machining of parts, it can

contr.

Removal of the workpiece 4 is carried out in reverse order: the nut 15 is unscrewed, the sleeve 13 is released, and hence the levers 7, which release the lobes 1 1 of the collet 2, which return to their original position, freeing the workpiece 4.

31220875.

For machining cylindrical deformations, the sleeve 13 in hoists, the sleeve 13 is made in the cartridge, it is possible to handle de rings with a conical thread with a different deflection surface 12. In this way . from cylindricity. .five

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Claims (1)

Collet chuck, the petals of a cylindrical collet which are designed to interact with the pressure element mounted with the possibility of contact with the conical sleeve associated with the drive element, characterized in that, in order to increase the accuracy of fixing, the pressure element is made in the form of levers with beveled ends with one side, with grooves on the inner and grooves on the outer surfaces, and on the outer surface of the collet is made an annular collar, while the beveled ends of the levers are designed to interact with conically th sleeve, and an annular shoulder - with grooves of levers, in the groove of which a coupling ring is inserted into the device. A SU ..,. 1220875 7, on the outer surface, a groove 8 is made under the ring 9, held by a pin installed ria of the outer 1 1220875