RU2593551C1 - Mill stand of planetary mill - Google Patents

Abstract

FIELD: metalworking.

SUBSTANCE: invention relates to metal forming for making sheet workpieces using planetary mills. Planetary mill stand comprises a bed, two separators, in which there are working and support rolls with free running bandages, planetary reduction gears. Higher rigidity and deformation degree, reduced dynamic loads on the drive without pulling and feeding devices for the strip are ensured by that carriers of the planetary reduction gears are rigidly connected with separators of the working rolls. Inside the planetary reduction gears there are sun gears fixed on the support rolls and satellites installed on bearings in the carriers. Shafts of the satellites are connected with the working rolls by couplings.

EFFECT: for installation of reductions mechanisms are provided for installation of rolls.

1 cl, 2 dwg

Description

The invention relates to the processing of metals by pressure and is intended for the production of high-quality and sheet blanks on continuous casting machines.

Known planetary rolling mill (copyright certificate for the invention SU No. 113219, application form. 10.29.1957), including master rolls, two sets of planetary rolls, pairwise combined in a bed, and in which the support rolls rotate freely on the shaft. Separator discs are rigidly fixed on the shaft, around the circumference of which are the pillows of the work rolls. Work rolls rotate towards the movement of the workpiece, the backup roll rotates in the direction of movement due to friction forces.

Closest to the claimed device is a cage of a planetary mill containing a bed, the drive rolls located in the bed, two pairs of separators with cantilever drive work rolls (RF Patent 2302914, published on July 20, 2007). The drive of each work roll is made in the form of a planetary gear transmission, in which the sun gear with internal teeth is fixed in the bed, and the satellite shafts are connected to the work rolls through friction clutches.

A disadvantage of the known planetary mill is:

- due to the rotation of the work rolls in the opposite direction to the movement of the workpiece, the workpiece is affected by the force pushing it out of the deformation zone, which necessitates the installation of feed rollers;

- the formation of an undershot of a strip with a length equal to the distance between the feed and planetary rolls;

- elimination of the previous drawback is possible when installing additional pulling rollers in the stand itself or a separate device at the exit;

- the process of capture by work rolls occurs at maximum compressions, which increases the dynamic component of the mill drive;

- insufficient rigidity of the roll system due to the cantilever design of the installation of the work rolls.

The objective of the invention is to create a working stand of the rolling mill, providing the necessary amount of compression when rolling continuously moving cast billets without the use of feed and pulling rollers, reducing dynamic loads on the drive, ensuring high quality and accuracy of rolling by increasing the rigidity of the roll system.

The problem is solved due to the fact that the working stand of a planetary rolling mill contains a bed, two planetary gears, two planetary rolls, a pressure device. Each planetary roll includes a drive cage, in which the work rolls, a backup roll with a bandage and bearings are radially located. The back-up roll is supported through bearings and a slotted sleeve onto pillows installed in the frame windows. The housing of each planetary gearbox is a carrier. On the one hand, the carrier is rigidly connected to the separator, and on the other, with the drive of the mill. Inside the planetary gear there is a sun gear with external teeth. The sun gear is fixed on the axle of the backup roll included in the planetary gear. Satellites are mounted on bearings in carriers. The shafts of the satellites are connected to the work rolls by means of couplings.

The described working stand of a planetary rolling mill allows rolling of high-quality and sheet blanks without the use of master and pulling rolls due to the rotation of the separators towards the moving workpiece, and the working rolls - in the opposite. Due to the capture of the workpiece at zero reduction in the rolled section with its subsequent increase in the process of turning the carrier and rolling the workpiece with work rolls in the direction of movement of the continuously casted workpiece, dynamic loads are reduced. Rolling accuracy is ensured by the presence of a freely rotating bandage on a stationary backup roll.

The invention is illustrated by the following drawings:

FIG. 1 is a General view of the working stands of the planetary rolling mill,

FIG. 2 is a diagram of the process of interaction of work rolls, separators and strip during rolling on a planetary rolling mill.

The working stand of the planetary rolling mill (Fig. 1) contains a frame 1, two separators 2, in which the working 3 and backup rolls 4 with shafts 5, planetary gearboxes are located. The carrier 6, which are the planetary gear housings, is rigidly connected to the separators 2. Inside the planetary gears there are sun gears 7 with external teeth mounted on the stationary support rolls 4, and satellites 8 mounted on bearings in the carriers 6. The shafts of the satellites 8 are connected to the work rolls 3 by means of couplings 9. The backup rolls are mounted on bearings 10 and 11 in pillows 12 on the one hand and on splined bushings 13 in pillows 14 on the other hand. The relative position of the work rolls 3 of each planetary roll when The mill turning is provided by turning the back-up roll 4 with splined bushings 13 with their subsequent fixation in the pillows 14, which are installed in the window of the bed 1.

The working stand of the planetary rolling mill operates as follows. When the drive is turned on, the carrier 6 is driven into rotation, which transmit rotational motion through the stationary sun gear 7, the satellites 8 and the coupling 9 to the work rolls 3. Compression of the moving workpiece occurs between the work rolls 3, which are alternately fed by the separators 2 towards the moving workpiece, which is rolled by the drive workers rolls rotating in the direction of movement of the workpiece. To ensure the rigidity of the system, the work rolls are supported on the support rolls 4 through the bandages 5, which are freely supported by the bearings. The setting of the specified compression by each working roller is ensured by changing the drive speed, and the size of the workpiece obtained is provided by the pressure mechanism 15. Setting the position of the work rolls of each of the mill roll blocks is made by turning the backup rolls with bushings 13 with their subsequent fixation in the pillows 14, which are installed in the window of the frame 1.

The described working stand of a planetary rolling mill allows you to abandon the feed and pulling rollers, to obtain the necessary degree of deformation and rigidity when rolling high-quality and sheet billets due to the rotation of the separators towards the moving ingot, and the work rolls in the direction of movement of the continuously cast billet, which reduces dynamic loads when the ingot is grasped at zero reduction, followed by its increase in the process of carrier rotation and workpiece rolling, the work rolls are directed and motion continuously cast billet.

Claims (1)

The working stand of a planetary rolling mill for rolling a continuously cast billet containing a bed, two separators in which work rolls, planetary gears with sun gears and satellites are located, characterized in that it contains fixed backup rolls with freely rotating bandages, planetary gearboxes have housings, made in the form of carriers, rigidly connected to the separators, the satellites are mounted in bearings on the carriers and are connected to the work rolls via couplings, while the solar poles The stubs are made with external teeth, providing rotation of the work rolls in the direction of movement of the continuously cast billet during rotation of the separators in the opposite direction, and capture of the billet at zero reduction, followed by its increase during the rotation of the carrier.

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