RU2238814C2 - Apparatus for straightening of articles by stretching thereof - Google Patents

Abstract

FIELD: plastic working of metals.

SUBSTANCE: apparatus has bed, cross-piece movable in vertical plane and connected to power cylinder, and two pairs of upper and lower clamping jaws mounted on cross-piece and bed, respectively, and equipped with device for moving thereof along straightening axis. Device for moving each clamping jaw is made in the form of carriage mounted for movement along straightening axis and furnished with hydraulic cylinder for effectuating said movement. Hydraulic cylinder is connected with power cylinder. Apparatus may be provided with cylindrical rollers mounted on supporting surfaces of cross-piece and bed. Roller surface out of contact with supporting surfaces of cross-piece and bed is made beveled for compact arrangement of rollers.

EFFECT: increased efficiency owing to eliminating of bending of movable cross-piece without employment of special straightening systems.

2 cl, 1 dwg

Description

The invention relates to the field of metal forming, and more particularly to devices for dressing products by stretching.

A device for editing stretching [Correct - stretching machine. Moshnin E.N. Bending, tightening and dressing on the press. M., Engineering, 1959, pp. 320-321, Fig.217], containing a horizontal frame, along the guides of which move the clamping carriage. The tensile force is created by a hydraulic cylinder connected to the front clamping carriage, and the clamping mechanisms are made self-tightening wedge type.

The disadvantage of this device is the small opening of the jaws, which significantly narrows the scope of its application.

A known device for dressing products with stretching [SU 1625540 A2, 02/07/1991, B 21 D 3/10], adopted as a prototype, containing a frame mounted with the possibility of movement by means of an elastic element in the vertical direction of the yoke, two pairs of upper and lower clamping jaws mounted respectively on the traverse and on the bed, as well as a means of interleaving clamping jaws along the axis of dressing by means of a spring-screw mechanism.

The disadvantage of this device is that due to the different stiffness of the elastic elements, it is impossible to exclude the distortion of the beam. To avoid skewing, the device should be equipped with a special skew alignment system, which greatly complicates the design.

The problem solved by the invention is to eliminate distortions of the movable beam without the use of special alignment systems.

This problem is solved as follows.

A known device for straightening products by stretching, comprising a bed installed with the possibility of moving in the vertical direction of the beam, two pairs of upper and lower clamping jaws mounted respectively on the traverse and on the bed, and also the means for moving the clamping jaws along the axis of editing according to the invention is equipped with a power cylinder, associated with the traverse, and the means of moving each clamping jaw is made in the form of a carriage mounted to move along the axis of editing and equipped with a hydraulic cylinder m to ensure this movement, hydraulically connected to the power cylinder.

In addition, the device is equipped with cylindrical rollers mounted on the supporting surfaces of the traverse and the bed, the carriages are supported by said cylindrical rollers, and the surface of the rollers not in contact with the supporting surfaces of the traverse and the bed is cut for a more compact placement of the rollers.

The drawing shows a General view of the proposed device.

A device for dressing products by tension contains a frame 1 and a movable in the vertical direction of the yoke 2, associated with the power cylinders 3.

A fixed support 4 with a clamping jaw 5 and a carriage 6, supporting a clamping jaw 7, mounted with the possibility of horizontal movement along the straightening axis from the hydraulic cylinder 8 are installed on the bed 1.

A support 9 with a clamping jaw 10 is mounted on the traverse 2, an opposite support 4 with a clamping jaw 5, and a carriage 11 with a clamping jaw 12 is mounted opposite to the carriage 6 with a jaw 7, which also has the possibility of horizontal movement along the straightening axis from the hydraulic cylinder 13.

Carriages 6 and 11 also have reverse cylinders 14, 15.

The hydraulic cylinders 8, 13 of the movement of the carriages 6, 11 are hydraulically connected to the power cylinders 3.

There are pins 16 for coupling elements placed on the traverse 2 with elements placed on the frame 1, and there are spacers 17 placed on the frame 1 between it and the support 4 to hold the cylinder body 8 from displacement under the action of tensile forces.

The carriages 6, 11 are in contact with the supporting surfaces of the frame 1 and the beam 2 by means of cylindrical rollers 18, and for more compact placement of the latter on surfaces not in contact with the supporting surfaces, segments 19 are cut.

The device operates as follows.

In the initial position, the traverse 2 is raised up, the carriages 6 and 11 and the supports 4 and 9 are installed in the position corresponding to the length of the product to be straightened, and spacers 17 are installed between them on the frame 1.

The workpiece is placed on the jaws 5 and 7.

Traverse 2 with jaws 12.10 is lowered to close them with the workpiece, after which pressure is applied to the power cylinders 3 and the workpiece is clamped between the jaws.

At the same time, the pressure in the hydraulic cylinders 8, 13 increases, because they are hydraulically connected to the power cylinders 3.

The increase in pressure in the hydraulic cylinders 8, 13 occurs up to the dressing force, while the horizontal movement of the carriages 6, 11 occurs and the workpiece is stretched.

The hydraulic connection between the power cylinders 3 and hydraulic cylinders 8, 13 provides a constant ratio of clamping force and exhaust.

The clamping coefficient depends on the material of the product and is determined by the formula

where F ₁ - the total area of the power cylinders;

F ₂ - the total area of the cylinders for moving the carriages.

After the end of the tension, the pressure in the power cylinders 3 is relieved and the crosshead 2 rises to its original position. The workpiece is removed from the jaws and pressure is applied and return cylinders 14, 15, moving the carriage 6, 11 to its original position.

The proposed design provides the movement of the carriages 6 and 11 while maintaining the level of movable and fixed jaws, which eliminates distortions of the movable beam and does not require special tools for its alignment.

In addition, one pair of clamping jaws does not have any drives, which simplifies the design.

The design advantages also include the fact that the carriages with clamping jaws can be mounted on an existing vertical hydraulic press, as a result of which the design becomes multifunctional.

Claims (2)

1. A device for dressing products by tension, comprising a bed installed with the possibility of moving in the vertical direction of the yoke, two pairs of upper and lower clamping jaws mounted respectively on the yoke and bed, and also means for moving the clamping jaws along the axis of the dressing, characterized in that it equipped with a power cylinder associated with the traverse, and the means for moving each clamping jaw is made in the form of a carriage mounted to move along the axis of the dressing and equipped with a hydraulic cylinder for especheniya this move fluidly connected to the power cylinder. 2. The device according to claim 1, characterized in that it is equipped with cylindrical rollers mounted on the supporting surfaces of the traverse and the bed, the carriages are supported by said cylindrical rollers, and the surface of the rollers not in contact with the supporting surfaces of the traverse and the bed is cut for more compact placement of rollers.