RU1814995C - Self-centering lathe chuck - Google Patents

Abstract

Usage: in machine tool industry, namely in clamping devices for lathes, SUMMARY OF THE INVENTION: The self-centering turning chuck comprises a housing 1 with a hollow protrusion on which the central helical wheel 5 is located and the gears 6 which are telescopically connected therebetween, which are located in constantly engaged with gears 8, and the rod 13, moved in the cavity of the protrusion, is equipped with a hard stop 14. 1 ill.

Description

The invention relates to machine tool industry and can be used on lathes.

A self-centering turning chuck is known in which the cams are connected to a stem using a wedge joint. This cartridge can operate in clamp and expand mode.

The purpose of the invention is to increase the reliability of the cartridge.

This goal is achieved by the fact that the cartridge is equipped with a wheel with end teeth designed to mesh with manual gears and splines on the outer surface, designed to communicate with the inner surface of the central helical wheel, mounted axially movable to the stop inserted into the device located in the housing.

The drawing shows a General view of a self-centering turning chuck.

Self-centering turning chuck consists of a housing 1, in the radial T-shaped grooves of which are placed working cams 2 with helical rails. Each cam rail 2 is meshed with helical wheels 4 radially spaced on the axles 3, which in turn interact with the central screw wheel 5. On the hollow projection of the housing 1, there is a wheel with end teeth 6. The central screw wheel 5 is connected to the wheel with the front teeth 6. The wheel with the front teeth 6 is meshed with the central screw wheel 5, while the transmission of torque is possible with axial movement.

Structurally, this is ensured due to the spline connection between the central screw wheel 5 and the wheel with mechanical teeth 6. The wheel 6, mounted for rotation on the hollow protrusion, is axially displaced by the lock washer 7, and the mechanical teeth are in constant engagement C manual adjusting sterns 8 mounted on axles 9, In the circular groove of the central helical wheel 5, arms of levers 10 enter. They are mounted on axles 11 and are mounted in the protrusions of the housing 12. T ha 1.3 is contacted by hard stops 14 with the second ple s 10 arm.

Self-centering lathe chuck works as follows.

During the adjustment of the cartridge to the fixed diameter of the workpiece, it is necessary to enter into rotation the axis 9 of the gear 8 of the cam adjustment mechanism. Gear 8

is in constant engagement with the wheel 6. In rotation, the wheel is driven in conjunction with the central helical wheel 5.

The radially spaced helical wheels 4 together with the axles 3 will begin to rotate clockwise or counterclockwise, depending on the direction of rotation of the previous parts. Cams through helical gear racks will receive movement up or down.

When the cams 2 come into contact with the surface of the fixed part, their movement stops. The radially spaced helical wheels 4 stop tc, and the central helical wheel 5, while continuing to rotate, moves axially (similar to the movement of the screw) until it reaches the stop in the form of a pin 15 or

lock washer 7.

For normal operation of the power clamp mechanism, it is necessary to provide a gap between the restrictive elements and the Central screw wheel 5 in the period

cam adjustments 2.

On this, adjustment of the cartridge to the fixed diameter is considered complete.

Power fastening of the workpiece is carried out as follows. To fix the part with the inner surface of the cams 2, air is supplied to the left cavity of the pneumatic cylinder, the rod 13 is moved to the right, with a hard stop 14, acting on the levers 10, which

move the central helical wheel 5 in the same direction. The radially spaced helical wheels 4 on the x-axis 3 begin to rotate counterclockwise, interacting with the helical gear racks ku-.

2 sweethearts, moving them down. The part is fixed by the inner surfaces of the cams 2, i.e. Clamp mode is in progress.

For operation in the expand mode, i.e. fixing the part with the outer surface of the cams 2, air is supplied to the right cavity of the working pneumatic cylinder, the rod 13 moves to the left, interacting with the levers 10 with a hard stop 14, moves

central helical, wheel 5 in the same direction. The radially arranged wheels 4 on the axles 3 rotate clockwise, interacting with helical racks of the cams 2, moving them upward; the part is secured by the outer surfaces of the cams 2.

1

Technical and economic advantage

The claimed solution is to increase the reliability of the device by eliminating the shock loads on the tooth of manual gears.

Claims (1)

SUMMARY OF THE INVENTION A self-centering turning chuck, in the radial grooves of the housing of which there are clamping jaws associated with a manual size adjustment mechanism made in the form of gears, the axes of which are perpendicular to the axis of the chuck, and a helical gear, the wheel of which is located in the central hole of the housing and It is connected with a clamp drive via two shoulders chaga, the axes of which are located on the protrusions of the housing, characterized in that, in order to increase reliability, the cartridge is equipped with a wheel with end teeth. for engaging with manual adjustment gears and splines on the outer surface for communicating with an inner surface of a central helical wheel mounted axially displaceable to the stop inserted in the cartridge located in the housing.