SU1282974A1 - Arrangement for clamping rod material - Google Patents

Abstract

The invention relates to the field of metalworking and can be used when securing blanks on turning-turret lathes and multi-spindle machines. The aim of the invention is to improve the accuracy of clamping bar material. The device consists of a collet 1, in the grooves of the jaws of which the cams 2 are located, with springs 3 arranged in their openings, which are intended to interact with the disc support 4, between the end surfaces of the collet I and the cams 2 are placed in contact with the flange 7, mounted on the end of the spindle 8. The clamp rod 9 is carried out from the drive connected with the device through the pipe clamp 10, screwed on the tail part of the collet 1. 2 3. p. f-ly, 3 Il.

Description

ten

189

ig.1

(L

Yu

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four

The invention relates to metalworking and can be used when clamping bar material on flocks of a turning group.

The purpose of the invention is to improve the accuracy of clamping bar material by introducing into the device wedge, their and guide elements.

FIG. 1 shows a bar feeder, section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows an embodiment of the proposed device.

The device (Fig. 1) consists of a collet 1 with inclined grooves in the jaws under the cams 2, in the openings of which springs 3 are located, which are in contact with the disk-stop 4. From falling out, the cams 2 are held by an annular spring 5. Between the end surfaces of the jaws the collet and its cams are placed on the wedging elements 6, which are in contact with the flange 7, fastened at the end of the spindle 8 and interacting with their conical hole with the jaws of the collet 1. The bar 9 is clamped from the actuator connected to the device through the clamp pipe 10 screwed on tail The collet part 1.

In the exemplary embodiment of the proposed device (Fig. 3), with the similarity of the components constituting it, the difference is the presence in the cams 2 of the collet I of inclined grooves B, which are located the guide rollers II interacting with the working surfaces of the grooves of the jaws of the collet. Angle and. the slopes of the working surfaces of the grooves of the collet and its cams are similar in size.

The device works as follows

Before starting the clamping in the decompressed state of the device, when the jaws of the collet 1 are separated, the cams 2 are displaced to the extreme right position under the action of the springs 3 and 1k and maximally removed from the collet 1. At the same time, with their inclined part they push up the wedging elements 6 , thus preparing the device for the subsequent implementation of the clamp bar 9.

After the bar 9 is fed up to the stop and the clamping drive of the collet 1 is actuated, it moves to the right and, with its inclined ends, lowers the wedging elements down. The latter, slipping along the flange 7, move the cams 2 of the collet to the left, so that the jaws of the collet and its cams move in opposite directions, right up to the clamping of the bar.

The basis of the device clamping scheme is that the main component of the clamping force of the drive is split into two, the transition into the substituting forces of the opposing movements of the jaws and cams. Each of these subassemblies, taken separately, allows for a certain clamping gap, and in this combination they mutually exclude each other, thereby producing an effect of self-tuning in the axial direction.

In addition, the presence in the proposed device of three inclined movable working surfaces of the combination with their counter-displacement allows to reduce the required clamping bias of the collet by a factor of 2-3.

Claims (3)

Invention Formula . A device for clamping bar material containing a collet with cams arranged in inclined grooves of its jaws, in which holes are made for springs, and a disc-stop mounted in an annular bore of jaws of a collet, designed to interact with springs, characterized in that the accuracy of clamping bar material, the device is equipped with wedging elements, and on the end surfaces of the jaws of the collet and the jaws opposite to the position of the disk-stop are inclined surfaces designed for action with riving elements. 2. The device according to claim 1, characterized in that it is provided with guide elements, and on the outer surfaces of the cams there are slots designed to accommodate the guide elements at an angle equal to the angle of the inclined slots of the jaws of the collet. 3. The device according to paragraphs. 1 and 2, characterized in that the proppant and guide members are in the form of rollers. / iD 10 .1 .8, 3 9и.г.2  3 and 6 2