RU1814996C - Collet chuck - Google Patents

Abstract

Usage: in metalworking for clamping piece blanks on metal cutting machines. SUMMARY OF THE INVENTION: Inside the housing 1, collets 2, 3, 4, 5 are placed. Inserted one into the other. In this case, the working surfaces of the collet jaws are made of different diameters, and the jaws are arranged around the circumference with an equal step in the direction of increasing their diameters. In the shank of each collet 2, 3.4, 5, longitudinal grooves 8 are made, and in the ends of the jaws-holes 9. A screw groove 7 is made on the stem 6, and protrusions 12 are made on its end. To change the collet, the manipulator introduces the collet into the holes 9 of the collet plugs, Then the rod b from the clamp drive moves to the right and, by means of the screw groove 7, rotates by 90 °. In this case, the protrusions 12 of the rod 6 coincide with the longitudinal grooves 8 on the shank of the collet, and the manipulator moves to the right with the released collet. As a result of this, the changeover of the cartridge occurs. 5 ill.

Description

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The invention relates to metal working and can be used for clamping piece blanks and cutting tools with a cylindrical shank on metal cutting machines. Collet chucks are known which comprise a housing with clamping collets bushings arranged in one another with working jaws and elastic elements, the elastic elements of one collet being located in the slot of the other.

The purpose of the invention is to increase the reliability of fixing and to increase the range of fixed workpieces.

Figure 1 shows a collet chuck, a longitudinal section; figure 2 - capture manipul tyra; Fig. 3 is a right view; figure 4 is a view along arrow B in figure 1; figure 5 - the position of the protrusions of the rod when changing collets.

The collet chuck consists of kopnyca (spindle) 1 (see Fig. 1) inside of which collets 2,3, 4, 5, rod 6 with a screw groove 7 are placed. The working surfaces of the collet jaws are made of different diameters. And the jaws are located around the circle with an equal step in the direction of increasing their diameters.

In the shank of each collet 2, 3, 4, 5, longitudinal grooves 8 and holes 9 (see Fig. 3) are made at the ends under the tongs-plugs 10 (em. 2) of the manipulator 11 for changing them.

The screw groove 7 (see Fig. 1) on the stem 6 allows the axial stroke of the stem 6 to be rotated by 90 ° and thereby rotate the protrusions 12 of the end of the stem of the current by 90 with the help of the guide pin 13, which is fixed by the locking screw 14.

The cartridge works as follows. To change, for example, the collet 5, using the manipulator 11, three plugs 10 are inserted into the holes 9. of the collet 5 when moving left. Then the rod 6 from the clamp drive, for example, hydraulic (not shown) is moved to the right and, by means of the screw groove 7, expands 90 ° relative to the fixed pin 13 in the housing 1 (i.e., from the position of Fig. 4 to the position of Fig. 5). In this case, the protrusions 12 of the end face of the rod 6 coincide with the longitudinal grooves and 8 on the shank of the collet

5. Then the manipulator 11 moves to the right together with the collet 5 held by the plugs 10. As a result, the clamping device is shifted from the diameter Di dmin to

da di (i.e. to the next step). When the rod 6 moves to the left, it rotates 90 ° to the opposite side (i.e., from the position of Fig. 5 to the position of Fig. 4). With further movement to the left, parts of diameter d2 are clamped. The design provides for a change (readjustment) in strict sequence (from di dmin to d4 dmaxnpn when removing the collets or from d4 dmax to di dmin when introducing the collets) (see

figb and 7).

Dowels (not shown) must be provided for all collets to eliminate their rotation relative to the spindle.

Claims (1)

Claims Collet chuck, in the case of which a conical surface is made and a set of collets are installed: coaxially arranged one in the other, moreover, the lips of each collet The set is placed between the lips of the other as well. collet shanks are designed to interact with their movement drive, including a rod, characterized in that, in order to increase the reliability of fixing and increase the range of fixed blanks, the working surfaces of the collet jaws are made of different diameters, and the jaws are arranged around the circle with an equal step in the direction of increasing them diameters moreover, on each collet there is made an external conical surface intended to interact with the conical surface of the body, and on the shank of each collet there are longitudinal grooves, while on. the end of the actuator stem is made of radial protrusions designed to interact with the longitudinal grooves of the shanks, and on the outer surface of the stem - a helical groove / designed for interacting with a finger inserted into the cartridge, rigidly fixed in the housing, the rod being rotatably mounted in the housing. ZiZЈ