SU906644A1 - Collet chuck - Google Patents

Description

(54) TSANGOVYY CARTRIDGE

The invention relates to mechanical engineering and can be used to clamp parts such as shafts in two benches.

A known collet chuck for clamping parts in two sections, comprising a tubular body, a pressure rim associated with a clamping mechanism, a double sided collet with a base band between its conical holes, in contact with the corresponding conical surfaces of the tubular body, and pressure plate 1.

However, in a known cartridge, the clamping force of the workpiece with the collet cooperating with the body cone depends on the axial force required for radial deformation of the collet lobes, the conical surface of which interacts with the pressure rim cone. From the condition of elastic deformation of the petals, this axial force cannot be greater than a certain value, depending on the structural dimensions of the petals of the collet. This force in certain cases can not provide a secure fixing of the workpiece.

The purpose of the invention is to increase the clamping reliability of the workpiece.

This goal is achieved so that the cartridge is provided with a retainer made in the form of a sleeve with a conical outer surface and in the petals of the collet in contact with the pressure rim, a conical bore made to interact with the conical surface of the retainer, and the clamping mechanism associated with the drive and the sleeve retainer with the cover, while between the cover and the end of the pressure rim is inserted into the cartridge springs.

FIG. 1 shows the design of the collet chuck; in fig. 2 shows the position of the cartridge elements in the initial state in FIG. 3 is the same when clamping the part with the right collet; in fig. 4 - the same, when clamping the part with the left collet.

The collet chuck consists of body 1, to which hydraulic cylinders 2 with pores 3 are screwed on both sides. On both sides, hydraulic cylinder 2 is closed with caps 4. Tubular body 5 is rotated using gears b and

7 in roller bearings 8, the axial displacement of which is limited by the roofs 9. On the outer surface of the corus 5, the sleeve 10 moves with the drill for the stop axle plates 11, covered by the walls of the groove of the piston 3. In the hole of the tubular body 5 there is a sleeve 12 with a collar connected to the sleeve 10 through the grooves in the housing 5 pins 13 held from falling out of the spring 14. In the hole

sleeve 12 is a pressure rim Yu 15, between the end of which and the lid 15, screwed on the sleeve 12, there is an elastic element 17. The collet consists of a left 18 and a right 19 collets rigidly connected with a bayonet 15 lock, while the left collet is in contact with the pressure rim 15, and the right - with a tubular body 5.

In the left collet, there is a tapered bore, which interacts with the tapered surface of the retainer 20, which is elastically connected with the sleeve 12 with screws 21 and springs 22. The workpiece 23 rests on the cover 24,

The cartridge works as follows. In the initial state (Fig. 2), the sleeve 10 is in the right extreme position, while using the end 25 of the pressure rim 15 the end 26 of the right collet 19 is pressed against the lid 24. The petals of the left collet 18 are clipped 3D between the conical surfaces of the retainer 20 and push rim 1b. The sleeve 10, moving to the left using the pins 13 of the sleeve 12 with the latch 20 and the pressure rim 15, moves the collet 35 element to clamp the workpiece 23 right collet 19 with the force of the preliminary deformation of the elastic element 17, since at the moment the petals of the left collet 18 remain Still DO pinched between the conical surfaces of the latch 20 and the pressure rim 15, the Pressure rim 15 stops, since no further movement of the collet element is possible (Fig. 3). With the further course of the sleeve 10, the sleeve 12 compresses the elastic element 17 and simultaneously, squeezing retainer 20 from the tapered hole of the petals of the left collet 18, the petals of the collet 18 are released and

a rigid clamping of the part 23 with the left collet 18 occurs (FIG. 4). The deformation of the elastic element 17 is equal to the relative relative movement of the sleeve 12 and the pressure rim 15 and 55 is determined by the formula

& .dv ()

(B

where d is the deformation of the elastic element; 40 (f maximum clearance between the collet sponge and the clamped part

ci- - u1ol cone Licator;

(B - the angle of the cone of the pressure rim.

During the return stroke of the sleeve 12 under the action of the elastic element 17, the pressure rim 15 and the collet element are stationary until the end face of the collar 27 of the sleeve 12 is in contact with the pressure rim 15. At this moment, the retainer 20 is also stationary and its connection with the sleeve 12 is carried out using a spring 22, Moving further, the sleeve 12 removes the pressure rim from the petals of the collet 18, which with its end 2b moves the collet to the right until the end of contact 26 of the collet 19 with the cover 2 Petals of the collet 18 unclench and allow the retainer 20 to its conical surface under the action of The guns 22 come into contact with the tapered hole of the collet 18.

I

The proposed design of the collet chuck makes it possible to use it effectively in clamping devices, in spindle assemblies of metalworking machines, as well as in other designs of metalworking equipment, where it is necessary to ensure a rigid clamp and precise centering of the Parts processed from two sides.

Claims (1)

1. USSR author's certificate in application number 2490630 / 25-08, class B 23 B 31/20, 1977. ii 2