RU2776242C1 - Press for rotation forming - Google Patents

Abstract

FIELD: metal working.

SUBSTANCE: invention relates to forging and pressing equipment, in particular, to mechanical presses for rotation forming. The press comprises a flywheel with a central threaded hole, installed in the frame and linked with a drive. A screw with an upper end part of a non-circular cross-section is installed in said hole, configured to move, wherein said part is located in the hole of a non-circular cross-section of the upper thrust bearing configured to rotate relative to the frame. Provided are a coupling, a brake and a slider with a lower thrust bearing whereon at least two cylindrical stops are secured. The free ends of the stops are installed in the corresponding holes made in the flywheel. The press is equipped with an auxiliary braking apparatus installed on the frame. The braking apparatus is configured to impact the upper thrust bearing so as to adjust the speed of translational motion of the slider with the lower thrust bearing relative to the upper thrust bearing.

EFFECT: technological capabilities of the press are expanded.

1 cl, 1 dwg

Description

The invention relates to forging and pressing equipment, in particular to the designs of mechanical presses.

Known press for stamping with torsion (B.I. No. 23, Patent No. 2514247, Press for stamping with torsion, publ. 27.04.2014. Bull. No. 23, ed. A.T., Gekhtman D.A., Zarudny V.V., Panin P.M., Bakhmatova A.G.; prototype), containing a drive flywheel located in the frame, a brake, a slider with a lower thrust bearing, rigidly installed in the frame upper thrust bearing, a screw with an upper end part of a non-circular section for installation in a sliding fit in the corresponding hole of the upper thrust bearing, and a threaded part forming a screw pair with a drive flywheel and pivotally connected to the lower thrust bearing, at least two cylindrical stops.

The disadvantage of this press is that, due to the rigid connection of the upper thrust bearing with the frame, during the operation of the press, the workpiece settles with constant angular and linear velocities, and ultimately it is impossible to change the ratio between angular and linear deformations in the workpiece, and this, in turn, limits technological press possibilities.

The invention is aimed at expanding the technological capabilities of the press.

This is achieved by the fact that it is equipped with an auxiliary brake device mounted on the frame, the upper thrust bearing is rotatable relative to the frame, and said auxiliary brake device is configured to act on the upper thrust bearing to control the speed of the slider's translational movement with the lower thrust bearing relative to the upper thrust bearing.

In FIG. 1 shows a frontal section of the press.

The press contains located on the frame 1 drive, clutch, brake (not shown). A flywheel 2 connected to the drive is installed in the frame, in the central threaded hole of which a screw 3 is installed with the possibility of moving parallel to the axis of the flywheel with an upper end part of a non-circular section, along which the screw is inserted into the corresponding non-circular hole made movable relative to the frame of the upper thrust bearing 4 to form a translational couples. On the lower thrust bearing 5 of the slider 6, at least two cylindrical stops 7 are additionally fixed parallel to the axis of the screw 3, the free ends of which are installed in a sliding fit in the corresponding holes of the flywheel 2. The screw 3 is fixed by means of a bolt 8 on the lower thrust bearing 5 to formations with the last articulated pair. In this case, the lower thrust bearing 5 can rotate relative to the bolt 8, rigidly connected to the screw 3. To control the speed of the translational movement of the screw 3 with the lower thrust bearing 5 relative to the upper thrust bearing 4, an auxiliary brake device is installed in the frame 1, containing a cylinder 9, a spring 10, a piston with a rod 11, the end of which is in contact with the side surface of the upper bearing 4 with the possibility of acting on the upper bearing 4 to control the speed of the translational movement of the slider 6 with the lower bearing 5 relative to the upper bearing.

The press works as follows. When the flywheel 2 rotates through the stops 7, the rotational movement is transmitted to the lower thrust bearing 5. In turn, the latter, thanks to the screw pair flywheel-screw, will move down or up with the slider 6, since the screw 3 can reciprocate depending on the direction handwheel rotation 2.

When pressure q of the liquid is applied to the working cavity A of the cylinder 9, the piston with the rod 11 will move in the radial direction, overcoming the resistance of the spring 10, and will act on the thrust bearing 4 with the force R, causing the friction force T=f⋅R in the circumferential direction, where f is the coefficient of sliding friction. Under the action of this force, the thrust bearing 4 will begin to rotate at a speed less than the angular velocity of the flywheel 2 by Δω, which will cause rotation of the screw 3 with the thrust bearing 5 relative to the flywheel 2, and the latter will move down until it comes into contact with the workpiece and for its further plastic processing.

At the same time, by changing the pressure of the working fluid in the cavity A of the cylinder 9, it is possible to change the speed of the translational movement of the screw 3 with the thrust bearing 5, and thereby smoothly adjust the ratio between the angular and linear deformations in the workpiece. As a result, the torque will be transmitted to the workpiece until the necessary degree of shear deformation is provided in it.

When the auxiliary braking device is turned off, the pressure q of the working fluid in the cavity A of the cylinder 9 will be equal to zero, and the spring 10 moves the rod with the piston 11 away from the side surface of the thrust bearing 4. As a result, the flywheel 2, screw 3 and thrust bearing 4 will simultaneously rotate at a rotation speed of ₂ flywheel 2 and the speed of the translational movement of the screw 3 with the lower thrust bearing 5 will be equal to zero.

The presented design of the press will allow plastic processing of workpieces to high degrees of shear deformation and upsetting, specified according to the technical process, and thereby expand the technological capabilities of press equipment in production conditions.

Claims (1)

A press for stamping with torsion, comprising a frame, a flywheel installed in the frame and connected to the drive with a central threaded hole, in which a screw is movably installed with an upper end part of a non-circular section installed in a non-circular hole made in the upper thrust bearing, a clutch, a brake and a slider with a lower thrust bearing, made with the possibility of translational movement, at least two cylindrical stops fixed on the lower thrust bearing, with their free ends installed in the corresponding holes made in the flywheel, characterized in that it is equipped with an auxiliary braking device mounted on the frame, the upper thrust bearing is made with the possibility of rotation relative to the frame, and the mentioned auxiliary brake device is made with the possibility of influencing the upper thrust bearing to control the speed of the translational movement of the slider with the lower thrust bearing relative to the upper thrust bearing.

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