SU761042A1 - Working stand for cross-rolling section mill - Google Patents

Description

The invention relates to the processing of metals by pressure, concerns the improvement of the design of the working stand of cross-rolling mills, can effectively be used for the production of specialized products, mainly of small diameter (30-80 mm) when rolling billets with their front end being captured by the feed mechanism cartridge.

Known working stand mill cross rolling, containing the frame, in the bores of which are located the roll assemblies mounted on the drive shafts, each of which has a stationary rear bearing support (bearing from the side opposite the entrance of the rolled metal), and drives the radial movement of the rolls [1].

The use of a known working stand for rolling core products reduces the metal waste, since it becomes possible to approach the chuck of the feed mechanism (for gripping the workpiece) to the work roll.

A disadvantage of the known working stand of the cross-rolling mill is that the bending force that occurs during rolling, which is transmitted through the work roll to the shaft, bends it. Roller roll deflection significantly reduces' point15

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ness of rolled products, which when rolling on this stand is ± 1%. It can not meet the requirements for products from mass production.

Also known working stand mill transverse rolling of specialized products, containing located in the bed in cases working rolls mounted on shafts connected to the respective buildings through the front and rear bearing supports, and the drive radial movement of the rolls [2].

The disadvantages of the known working stand is that for the transfer of work rolls requires considerable time (dismantling of bearing assemblies, assembling them and adjusting), as well as the fact that the length of the captured end of the workpiece increases, which serves to capture its feed mechanism chuck, which reduces metal utilization rate.

The aim of the invention is the reduction of metal waste and the improvement of technological conditions for handling rolls.

This goal is achieved by the fact that the working stand is equipped with cassettes by the number of shafts placed in the respective housings, the front bearing supports are installed in the cassettes, each of

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The front bearing supports are made in the form of two rollers mounted on eccentric axes, which can interact with the shaft, the axes of the rollers being located above the shaft axis.

The use of the known working stand of the cross-rolling mill for profiled products allows to reduce the time for handling work rolls. This is achieved due to the fact that during the transfer of work rolls, it is enough only to remove the front bearing support and no bearing assembly disassembly is required.

In addition, in the proposed design of the working stand, the front bearing bearing is placed above the rolling axis, then a space is released under the work roll shaft, which allows the feed mechanism chuck to go very close to the work roll and capture the technologically necessary length of the workpiece section, i.e. reduce the size of the “castor”, which is further cut off.

FIG. 1 shows the working stand of the cross-rolling mill section, the general view; in fig. 2 — section A — A of FIG. one; in fig. 3 - view B of FIG. 2

The working stand of the cross-rolling mill for profiled products contains a frame 1, in the bores of which are placed the work rolls mounted in the housings 2, mounted on the shafts 4, each of which is installed in the front 5 and rear 6 bearing supports. The rolls 3 are driven 7 radial movement.

The front bearing support 5 is made in the form of two rollers 9 mounted in a common cassette 8, installed above the axis of the roll unit on eccentric axes 10, placed in bearings 11. The rollers 9 are constantly in contact with the shaft 4, which is achieved by turning the axles 10, which is carried out by means of levers 12 and screws 13. For less wear of the shaft at the points of contact with the rollers 9, a quick-change sleeve 14 is mounted on the shaft. The cartridge 8 is fastened with bolts 15 on the roll housing 3.

The device works as follows.

When rolling the billet 16 into the variable profile product, its front end is captured by the feed chuck 17, and since the bearing 5 is located above the rolling axis, the chuck 17 freely approaches the rolls 3 and captures the end of the workpiece 16 in close proximity to the roll 3.

From the actuator 7, the movable bodies 2 with the rollers 3 placed in them make radial movement 1 in the bores of the frame. From the drive shafts 4, rotated in the bearings 5 and 6, the torque is transmitted to the rolls 3. When rolling to the shafts 4, the rolls 3 pass a bend4

binging effort. A part of this effort is compensated by a stationary bearing support 6. Another part of the bending force is compensated by rollers 9 mounted in a common cassette 8 and being in constant contact with the shaft shaft 4 through the sleeve 14. Constant contact of the rollers 9 with the shafts 4 can be restored at any time by turning the axes 10, carried out by means of the screw 13 through the lever 12.

This is achieved by reducing the amount of deflection of the shafts 4, which improves the accuracy of the rolled products.

To transfer work rolls, it is enough to remove the cassette 8, in which the front bearing assembly 5 is mounted, while dismantling the bearing assemblies of supports 5 and 6 is not required.

The proposed working stand of the cross-rolling mill for profiled products can significantly reduce the time for handling work rolls, which reduces the unproductive downtime of the mill, thereby increasing its productivity.

In addition, the application of the proposed design of the working stand allows to reduce the length of the part of the workpiece, necessary for its capture by the cartridge of the feed mechanism and cut off on the following technological operations, thereby increasing the utilization rate of the metal.

The economic effect from the introduction of the proposed design of the working stand consists of metal savings (reduction of the cut length of the workpiece after rolling) and savings from increased mill productivity, due to the reduction in time for handling rolls.

The total annual economic effect will amount to 320,000 rubles.

Claims (1)

Claim The working stand of the cross-rolling mill for profiled products, containing work rolls mounted in the bed in cases mounted on shafts connected to respective buildings by means of front and rear bearing supports, and driving radial movement of the rolls, characterized in that, in order to reduce metal waste and improve technological conditions of transfer rolls, it is equipped with cassettes on the number of shafts placed in the respective buildings, the front bearing supports are installed in the cassettes, each of the front bearing supports are made in the form of two rollers mounted on eccentric axes, which can interact with the shaft, with the axes of the rollers located above the shaft axis.