SU1685623A1 - Collet chuck - Google Patents

Abstract

The invention relates to metalworking and can be used to secure bar stock. The purpose of the invention is to improve the fixing accuracy by increasing the radial rigidity. In the spindle 1, the collet 2 is installed. In the tapered bore of which cams 3 and additional spring-loaded cams 4 are placed. Flange 6 is fixed to the end face of spindle 1 and a spring-loaded separator 7 with an annular bridge installed in the grooves of cams 3 and 4 is installed on the surface of the projections of the flange 6. A collet 11 is connected to the recess of the collet 2, connected to the clamping pipe 10, cooperating on one side with the protrusion of the recess of the collet 2, and on the other hand to the cams 3. A spring 9 is installed between the end of the spindle 1 and the collet 2 10 Agim thrust bushing 11 and the cams 3 and 4 are moved to the left, the securing bars 5, and then the retaining sleeve 11 presses the projection of the collet 2, it shifts to the left, is produced the final clamp. 3 il. on

Description

The invention relates to metal processing and can be used to secure bar stock.

The aim of the invention is to improve the fixing accuracy by increasing the radial rigidity.

Figure 1 shows the cartridge, a longitudinal section; figure 2 is a section along aa in figure 1; on fig.Z - section bb In figure 2.

The collet chuck is installed in the spindle 1 (figure 1) and contains a clamp collet 2 with an outer cone of 15 ° and with a conical hole, inside which are the cams 3 and additional cams 4 (fig. 3), clamping the bar 5. To the front end the spindle 1 is screwed on the flange 6, on the cylindrical surface of the lugs of which

a separator 7 is installed with longitudinal grooves for cams 3 and 4 Three cams 3 are equally spaced around the circumference, and additional cams 4 are placed between them. The cams 3 are connected to each other by an annular bridge and a separator 7. The cams 3 have the same external grooves, the width of which corresponds (with minimum clearance) to the width of the annular bridge a. Similar grooves are made on additional cams 4, but the width of their grooves is greater than the width of the grooves on cams 3 (by 1-2 mm), which excludes the possibility of all cams 4 affecting jumper a. All cams 3 and 4 on the inner surface have grooves for different elastic rings-springs 8,

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preventing them from excessively shifting to the axis of the cartridge in the absence of a bar 5. On the flange lip there are five stacks (figure 2) for cams 3 and A. Angle (outer surface of cams 3 and 4 has a value close to the self-braking angle.

A compression spring 9 is placed between the ends of the undercut of the spindle 1 and the collet 2. A clamping sleeve 11 is screwed onto the pipe of the clamp 10, located in the undercut of the collet 2. One (left) end interacts with the undercut of the collet 2, and the other (right) with the ends of the cams 3. Separator 7 has axial holes for compression springs 12. resting on flange 6. Additional holes for springs 13 are also in additional cams 4, which from the thrust sleeve 11 are longer than cams 3 by the value I (fig.Z) Collet 2 is divorced i.e. its petals are separated from the center and thermofixed.

The cartridge works as follows.

To clamp the rod 5, the clamp pipe 10 is driven by a drive (not shown) to the left in FIG. In the initial stage of this process, the collet 2 is opened and the right end abuts against the flange 6, there is a gap between the left end of the thrust sleeve 11 and the return end of the collet 2. As the stop sleeve 11 moves to the left, the spring-loaded cams 3 and 4 also move to the left, shifting from cartridge axis. In this case, the cams 3, connected by a jumper and separator 7, move synchronously, and each additional cam 4 is displaced; they are separate under the separation of their springs 13.

Due to the fact that the supplementary cams 4 are longer than the cams 3, then with the left ends of all the cams equally moving to the left, the radial clearance between the inside of the cams 3 and the bar 5 is smaller than between the additional cams 4 and the bar 5. Therefore, the cams 3 between the collet 2 and bar 5, and then additional cams 4. Due to this, bar 5 with high accuracy is centered by three equally spaced cams 3, the axial position of additional cams After that, 4 is different and is determined by the deviations of bar 5 from roundness.

After sampling the gap end of the thrust sleeve 11 presses the collet 2 and shifts it to the left. The radial component in the conical interface of the collet 2 to the spindle 1 through the cam cams 3 and 4, the rod 5 is clamped finally with high rigidity in the radial direction. FIG. 1 cartridge is depicted in the clamped state.

To release the bar, the clamp pipe 10 is shifted to the left. From the moment this movement starts, the sleeve 11 ceases to press on the collet 2 and the latter is shifted to the right by the action of the spring 9. Under the action of the springs 8, the cams 3 and 4 radially move away from the axis of the cartridge, freeing the bar 5. Then the right end of the sleeve 11 comes into contact first with the left ends of the additional cams 4 and then with the cams 3 and shifts them to the right. In this case, together with the cams 3, the jumper on the separator 7 also moves to the right. The compression springs 13 and 12 are compressed. At the end of the unclamping of the collet 2, with its right end rests on the flange 6. The cams 3 and 4 are open.

Claims (1)

Claims A collet having a clamping collet measured in a spindle, one end of which is designed to cooperate with a clamping pipe, a flange mounted on the spindle face with axial projections and located in a tapered collet of a cam, in order to improve the accuracy of fastening the cartridge provided with a stop sleeve, springed relative to the flange by additional cams and mounted on the surface of the flange projections with a spring-loaded cage with a ring bridge, is located In the grooves made in the additional cams, in the main cams there are grooves designed to interact with the separator jumper, and at the end of the collet, intended to interact with the clamping pipe, there is a notch in which the stop sleeve is mounted connected to the clamping tube, one of the ends of the stop sleeve is designed to interact with the protrusion made in the recess of the collet, and the other with the cams, these additional cams are installed between the main cams and, the ends of which, facing the stop sleeve, are removed at a greater distance from it than the ends of additional cams, and a spring inserted into the device is located between the collet and the end of the recess in the spindle, n CM 1C LO OS 1C SC1