Abstract:
In the transverse wedge rolling machine as claimed in the invention the drive motor is a permanent magnet motor, especially a torque motor. Furthermore the rotational speed of the rollers is controlled depending on their rotary position.
Abstract:
In the transverse wedge rolling machine as claimed in the invention the drive motor is a permanent magnet motor, especially a torque motor. Furthermore the rotational speed of the rollers is controlled depending on their rotary position.
Abstract:
A roll stand for a rolling mill, comprising: a support structure adapted to be fixed at a selected location along a mill center line. First and second work rolls are configured and arranged to roll products directed therebetween. The first work roll has roll necks journalled for rotation in bearings contained in first chocks, and the second work roll likewise has roll necks journalled for rotation in bearings contained in second chocks, with the first and second chocks of the work rolls being arranged in pairs located on opposite sides of the mill center line. The first and second chocks of each pair are connected to the support structure for pivotal movement respectively about parallel first and second connecting axes which extend in parallel relationship with respect to the axes of the rolls and orthogonally with respect to the mill center line. An adjustment mechanism is provided for simultaneously pivoting the first and second chocks of each pair in opposite directions about their respective connecting axes in order to symmetrically adjust the parting between the work rolls.
Abstract:
A rolling stand having a stand casing, a first cylinder holding packing having a rolling cylinder rotatably mounted therein, a second cylinder holding packing having a rolling cylinder rotatably mounted therein with a rolling axis in parallel relation to the rolling axis of the rolling cylinder of the first cylinder holding packing, and four tie rods positioned at respective comers of the stand casing and each having a right-hand screw and a left-hand screw threadedly connected respectively to the cylinder holding packings so as to move at least one of the packings relative to the other. One of the cylinder holding packings includes an external bridge part coupled to the tie rods at either the right-hand screw or the left-hand screw, an internal part directly receiving the cylinder therein and coupled to the tie rods along an unthreaded portion of each of the tie rods, and a fluid dynamic cylinder connected to the external bridge part and to the internal part. The fluid dynamic cylinder moves the internal part toward or away from the external bridge part or for exerting a pressure onto the internal part relative to a predetermined amount of fluid introduced or removed from the fluid dynamic cylinder.
Abstract:
A housingless rolling mill having an upper and lower work roll, upper bearing blocks and lower bearing blocks for supporting the upper and lower work rolls, and screw-down cylinders for pulling the upper and lower bearing blocks vertically toward each other. The screw-down cylinder is tiltable with the use of upper and lower spherical. Legs of the lower bearing block are turnable in a roll cross direction. Lower cross cylinders are provided at the lower bearing block, and upper cross cylinders are provided at the upper bearing block to enable the work rolls to cross at an angle .theta.. Thus, a strip material is rolled to a satisfactory shape and thickness with the upper work roll and the lower work roll crossing each other.
Abstract:
A rolling mill in which an upper housing is guided upward and downward along columns, a fluid chamber is formed between the upper end section of each column and a column insertion hole of the upper housing; a fixed piston fixedly mounted on the column is fitted in the fluid chamber; a roll gap rapid widening piston is fixedly installed on the upper end of the column, and on this piston is vertically movably fitted a hydraulic cylinder; the hydraulic cylinder is fixedly mounted in the upper housing; pressure fluid is constantly supplied to an upper fluid chamber on the piston; a fluid chamber is provided in the column insertion hole of the upper housing, and a column clamping sleeve is fitted therein; and the pressure fluid is fed into, and discharged out of, the fluid chamber to move the upper housing upward and downward.
Abstract:
A roll stand with two or more pairs of roll housings 1, 2, 3, 4 and respectively 7,8. Roll bearing supports are slidingly conducted between the housings of the pairs, and the housings of the pairs are connected together outside the roll bearing supports by means of cross-arms 17, 18; 19, 20 or respectively 13, 14. They can be moved in the direction of the longitudinal axes of these threaded columns through inserted pressure nuts 21, 22; 23, 24 or respectively 34, 35 and with threaded columns 1a, 2a; 3a, 4a or respectively 7a, 8a, where these threaded columns are connected with the roll stands 1, 2, 3, 4 or respectively 13, 14. The threaded columns 1a, 2a; 3a, 4a or respectively 7a, 8a are fixedly set into the roll housings 1, 2, 3, 4 or respectively 7, 8, and stand upon them. The pressure nuts 21, 22, 23, 23 or respectively 34, 35 are drivably mounted in the cross-arms 17, 18, 19,20 or 13, 14 or 36, 37.
Abstract:
The disclosed stand comprises a housing with carriers that are located pairwise on either side of the axis of rolling oppositely to each other and accommodate the bearing chocks of the work rolls. The work rolls are disposed one above the other between the backup rolls. A device for prestressing the stand is included. A device for prestressing the work rolls separately interconnects the bearing chocks of the work rolls of each pair located one above the other.
Abstract:
In roll housings for rolling mills, it is desirable to be able to separate the top and bottom halves of the housing so as to be able to change the rolls. When the top and bottom halves are reassembled, they must be held firmly together to ensure correct operation of the rolling mill. It is proposed to have hydraulically-tensionable tie bars which are fixed in the lower half of the housing, and which grip the top of the upper half of the housing. Hydraulic fluid is applied to produce the tension, and the fluid pressure achieved is maintained throughout rolling operation. Such tie bars will normally be provided at at least four corners of a roll housing, and a single hydraulic circuit will supply fluid to all the bars. In addition, hydraulically operated jacks can be used to pivot the tie bars into and out of position, and these jacks can be operated from the same hydraulic circuit.The invention relates to a roll housing of divided construction with a removable housing cap and tie bar connections between the housing and the housing caps. Advantageously, the tie bars can be hydraulically stressed or prestressed for the operating state of the rollstand. The individual parts of the stand are thus prestressed by means of hydraulically elongated or extended tie bars. The rollstand is therefore provided with the stretch characteristics of an undivided rollstand.The extension force and therefore the elongation of the tie bar for releasing or stressing the tie bar was hitherto produced by hydraulic means and a screwthreaded nut was then screwed down for maintaining the tie bar in the extended and stressed state. This operation was performed manually or--in a more costly manner--by a hydraulically actuated ratchet drive. In this method, after tightening of the screwthreaded nut, the hydraulic pressure applied by the hydraulic extending device for the tie bars is discharged. To release the screwthreaded nut the extending device is again biased by hydraulic pressure medium and the screwthreaded nut is turned upwardly until the tie bar can be pivoted outwardly beyond the housing edge.Operation of the four screwthreaded nuts on each rollstand is awkward and time-consuming because the screwthreaded nuts, normally situated in the support sleeve of the hydraulic ring cylinder, can be actuated only through a slot in the support sleeve.It is the object of the invention to save the installation times required for extending and slackening the tie bars and therefore to reduce the time required for roll changing in such rollstands so as to provide further mechanization.To solve the problem it is proposed that the pressure medium which produces the prestressing forces can be supplied to or shut off from the tie bar heads of one or more rollstands through central means and the prestressing pressure continues to be applied to the tie bar head during rolling operation.In a further embodiment of the invention and independent of relieving the prestressing pressure, the tie bars of one or more rollstands can be pivoted outwardly together through central control, by means of hydraulic power.
Abstract:
A TIE ROD CLAMPING DEVICE SUITABLE FOR EXAMPLE FOR ROLLING MILL STANDS INCORPORATES A HYDRAULIC STRESSING DEVICE OPERATIVELY CONNECTED BETWEEN ONE END OF THE TIE ROD AND ONE OF TWO OR MORE MEMBERS TO BE HELD IN COMPRESSION BY THE TIE ROD TO PERMIT THE TIE ROD TO BE EXPANDED BY HYDRAULIC ACTION, AND IN WHICH THE COMPRESSIVE FORCE OF THE TIE ROD IS ADAPTED TO BE TRANSMITTED THROUGH A RAPID ADJUSTMENT THRUST-TRANSMITTING DEVICE, SUCH AS A DOG CLUTCH, ROTATABLE FROM A TOOTHTO-TOOTH POSITION TO A TOOTH-TO-GAP POSITION, EITHER TO TRANSMIT FORCE TO THE CONNECTED MEMBERS OR ALTERNATIVELY TO ALLOW FOR CONTRACTION OF THE TIE ROD WITHOUT TRANSMITTING COMPRESSIVE FORCES TO THE CONNECTED MEMBERS.