DE2434587A1 - Horizontal hydraulic press with removable top spar - has movable cross beam guided on central shaft - Google Patents

Abstract

Horizontal hydraulic press with a flappable or removable top spar (S) for expanding rings especially castings where the movable cross beam is guided on a central shaft (8) in the cylinder spar and can be so inclined about a horizontal shaft that the casting tools (18, 15) stand at an angle to each other. The press has at least two master cylinders and the hydraulic fluid feed to the cylinders is so regulated that the working motion of the two tools (18, 19) is either parallel or inclined to each other. Specifically the guide spar (8) is in the form of a stepped piston of a third working cylinder.

Description

Machine for expanding forged ltinzb blanks State of the art: Seamless rings with outside diameters of 2-6 m and widths over 1 m have been used so far Manufactured almost exclusively on open-die forging presses large ring widths, inner rollers with large diameters and thus very high rolling forces and rolling capacities and therefore only have a limited area of application.

The need in the industry for rings with dimensions over 6 m in diameter and widths up to 4 m can currently only be achieved by welding are covered by ring segments.

Object of the invention: The object on which the invention is based is the development of a machine for expanding on open-die forging presses produced ring blanks to seamless rings with very large diameters and widths and weights.

The special features of the hot deformation and the possible ones must be taken into account Special consideration should be given to irregularities in the ring due to the preliminary cutting process be taken.

Solution: A hydraulic press in known horizontal construction with removable upper beam for insertion seamless ring blanks equipped with the following features The press (Fig. 1) receives two working cylinders (1 + 2) with their pistons (3 + 4) via pendulum supports Press (5 + 6) on a horizontally movable crosshead 7, The crosshead (7) is fed to a central guide shaft (8) and is also in the two Frame halves (9 + 10) secured against rotation with guide shoes (11 + 12).

For the retraction movement of the crosshead (7) is on the guide rod (8) the traverse (13) attached. This traverse is connected to the (Fig. 2) shown '' piston (14 + ins) of the retraction cylinder arranged on the side of the press (16 + 17).

The crosshead (7) carries a forging tool (18), the second forging tool (19) is attached to the counter bar (20).

The lifting of the upper beam (9) for inserting and removing the rings can in known manner by folding up with hydraulic lifting devices or with a crane (21).

The rings to be forged rest on three collar rollers (22, 23 + 24). The collar rolls take over the transport of the rings during the forging process and support the ring during expansion. To do this, they are on sliding sleds arranged.

The coil trolley with the roll directly opposite the press (22) can be moved over a long distance. The two remaining fret rollers (23 + 24) are, as can be seen from Fig. 2, so arranged to the press axis that they also with very different ring diameters only a short travel distance for the Need ring support.

The forging process consists of a horizontal press stroke and from a further transport of the ring around the counter spar (20) together. He corresponds a ring rolling process in intermittent form, whereby as a result of the small width of the tools (18 + 19) the power requirement during the forging process is significantly lower is than in a comparative rolling process. The counter bar (20) can therefore withstand the bending forces occurring even with very large ring widths.

The crosshead (7) is attached to the guide rod (8) with a joint (25) stored in such a way that it is inclined against the vertical axis by the pistons (3 + 4) can. With the help of this inclination, the inequalities of the pre-forged ring blank are supposed to be can have, be compensated without the expanded ring impermissible irregularities receives.

The two working cylinders (1 + 2) are therefore connected to independent hydraulic systems connected with infinitely variable pumps.

Electronic length measuring devices not shown in the drawings which are connected to the sliding shoes (11 + 12), measure and compare the Position of the crosshead (7) and change, depending on whether the crosshead movement with vertical or inclined tool is desired, the Ö1Ru.lanf to the cylinders (1 + 2) so that the preselected crosshead inclination is independent during the lifting movement is maintained by the level of the load on the two working cylinders. The crosshead tilt during the expansion process, uneven material distribution in the blank can be compensated for and ensure that a ring with a very even inner shape with irregular External shape is created.

The same electronically controlled control device for the two However, the working cylinder is also used for eccentric cylinders that arise when the ring is widened Compensate forces.

For example, if the ring is so narrow that the center of the deformation force is below the central axis (13), the flow of oil to the cylinder (1) is throttled so that the movement of the piston (3) corresponds to the movement of the piston (4) for the The collar rollers (22, 23 + 24) required for transporting the rings have their own drive and are arranged on movable carriages so that they follow the expanding ring can.

Claims (5)

- Claims:) Horizontal hydraulic press with hinged or removable upper beam (9) for expanding rings, characterized in that the movable crosshead (7) guided on a central axis (8) in the cylinder spar is and can be inclined about a horizontal axis (25) so that the forging tools (18 + 19) are at an angle to each other. 2.) Hydraulic press according to claim 1, characterized in that net that the press is equipped with at least two main cylinders is and the supply of the pressure medium to the master cylinders is regulated so that the working movement of the two tools (18 + 19) either parallel to one another or is carried out in an inclined position. 3.) Hydraulic press according to claim 1, characterized in that the guide rail (8) as a stepped piston of a third, not shown in the drawing, Working cylinder is formed. 4.) Hydraulic press according to claim 1, characterized in that the ring to be forged rests on three or more collar rollers which make it tangential Direction transported through the press and supported in the radial direction. 5.) Hydraulic press according to claim 1 + 3, characterized in that that the coil rollers are arranged on movable carriages. L e r s e i t e