RU1808491C - Device for fixing workpieces - Google Patents

Abstract

Usage: in metalworking. For securing workpieces in metal-cutting machines where there is no axial drive for clamping workpieces. SUMMARY OF THE INVENTION: a main collet 2 and an additional collet 3 are located in the housing 1, and are fastened to the housing 1 by screws 4. The protrusions 5 are made on the main collet 2 in the form of a rectangular trapezoid. Square fingers are installed in the openings of the housing 1, on the outer sides of which grooves are made. the shape corresponding to the protrusions 5 of the collet 2. On the housing 1, a pressure ring 10 is installed, the inner working surface of which is formed by the conjugation of two radii - larger and smaller. Moreover, the surface with a smaller radius is designed to interact with the end surfaces of the fingers 7. When the pressure ring 10 is rotated counterclockwise to the position of the latch, the fingers 7 are displaced in the opposite direction relative to each other. Moreover, the main collet 2 moves upward by the height of the end protrusions 5 necessary to create a radial displacement of the additional collet 3 by the amount of contact deformation corresponding to the required clamping force of the workpiece. 3 ill.

Description

The invention relates to metalworking and can be used to fasten workpieces in metal-cutting machines, where there is no axial drive for clamping workpieces,

The purpose of the invention is to increase the accuracy of securing workpieces.

Figure 1 shows a device, a General view in partial section; figure 2 is a section aa in figure 1; in Fig.Z - section bB in Fig.1. ; ..

The device comprises a housing 1, in which a main collet 2 and an additional collet 3 are arranged, which are arranged to interact with each other. The additional collet 3 is attached to the housing 1 by screws 4. The main collet 2 is provided with protrusions 5 on the end surface and key protrusions on the outer side surface and is spring-loaded with a spring 6 relative to the additional collet 3. In the housing 1, keyways are made that interact with the key projections of the outer diameter the main collet 2, and through holes with a square cross section, which are located in the housing 1 symmetrically about its axis and parallel to each other.

Fingers 7 of square cross section are installed in the square holes, in which grooves 8 are made on one of the outer longitudinal sides for interacting with the mating protrusions 5 of the main collet 2. The rings 9 are located on both sides of the pressure ring 10. The inner working surface of the pressure ring 10 is formed the mating of two radii is greater than 11 and less than 12, while the smaller radius 12 is designed to interact with the end surfaces of the fingers 7, and when angularly turning the pressure ring 10 to carry out finger movement 7. The position of the rings 9 on the housing 1 is regulated by a nut 13 with a locking screw 14. When securing the workpiece 15, the angular rotation of the pressing ring 10 is limited by a latch 16, which is spring loaded by a spring 17, the tension of which is adjusted by the screw 18.

The operation of the device is as follows.

When the pressure ring 10 is rotated counterclockwise to the position of the latch 16, the fingers 7 are displaced in the opposite direction relative to each other. The main collet 2 moves upward by the height of the end protrusions 5 necessary to create a radial displacement of the additional collet 3 by the amount of contact deformation corresponding to the required clamping force of the workpiece 15.

To expand the workpiece, the pressure ring 10 is rotated clockwise, while the fingers 7 move in the opposite direction to the initial position and the main collet 2 moves under the influence of the spring 6 to the position of alignment of the protrusions 5 with the grooves 8 of the fingers 7.

Claims (1)

The claims A device for securing blanks, comprising a housing, a spring-loaded collet mounted therein and a collet movement drive, characterized in that, in order to increase the accuracy of fixing, the device is equipped with an additional collet rigidly fixed to the free end of the housing and placed in the housing so that its petals cover the petals of the main collet, and the petals of the collets are directed towards each other, and the movement drive is made in the form of a ring mounted on the housing with the ability to rotate, internally over which is formed by cylindrical surfaces of two different radii smoothly mating with each other, and the surface with a smaller radius is designed to interact with the ends of square fingers installed in through square parallel holes made in the housing symmetrically to the transverse axis, while on the shank of the main collet - at least two protrusions are made with a section in the form of a rectangular trapezoid, designed to interact with mating grooves made on the fingers. Compiled by A. Petrov Editor V. Fedotov Tehred M. Morgenthal Corrector P. Gereshi Order 1239 Mintage Subscription VNIIIPI of the State Committee for Inventions and Discover at the USSR State Committee for Science and Technology 113035, Moscow, Zh-35, Rauska nab., 4/5 Production and Publishing Plant Patent, Uzhhorod, 101 Gagarin St.