SU486822A1 - Working stand of multi-line tube cold rolling mill - Google Patents

Description

one

The invention relates to the tube-rolling industry and can be used in the working stands of a multi-line cold rolling mill.

Known working stand multi line mill cold rolling tubes. The presence of several gear-rack pairs in the drive of the rolls due to the gaps in the gear in the process of work does not ensure that the speeds of rotation of the rolls correspond to the flow rate of the metal, which reduces the reliability and quality of the rolled tubes.

In addition, single strand work stands are known. The disadvantage of such a stand is the uneven wear of the guides due to the asymmetrical application of force to the work rolls, which also reduces the reliability of the stand.

A working stand of a multi-cold cold rolling mill tube contains a movable frame, upper and lower shafts installed in it with a cantilever two pairs of working gauges and located in the middle between the pairs of gauges, the drive of their reciprocating rotational movement consisting of a gear block located on the lower shaft extreme rims

which interact with the rail, and the central one with the bristles located in the middle of the upper shaft.

In this stand, the number of gear pairs is reduced, but there is also a rack-and-pinion pair. The wear of the teeth increases the gaps and as the stand moves, shock loads occur in the drive chain, and therefore it is impossible to ensure that the speeds are fully consistent.

rotation of the rolls and metal flow, which reduces the reliability and quality of particularly thin-walled pipes being rolled.

The aim of the invention is to eliminate these drawbacks and increase the reliability of the stand.

This is achieved by the fact that each shaft in the proposed stand has a knee in the middle, which is connected to a hard drive of the reciprocating motion.

FIG. 1 shows a cage with a partial cut, front view; in fig. 2 - Kinematic scheme of a mill with a cage.

The cage contains a frame 1, located in it the upper and lower shafts 2 and 3, having

in the middle of the knee 4 and 5, and at the ends there are two pairs of cantilever-mounted ring calibers 6 and 7 and the drive located in the middle between the pairs of calibers, the return-rotation movement.

The drive of the reciprocating motion includes the knees 4 and 5, the connecting rods 8 connected to them and the movable slide 9 mounted in the bed, which is pivotally connected to the rods 8.

The movement of the slider can be carried out, for example, by means of a cam-lever mechanism 10 connected to the main drive, made in the form of a curved-rod-sliding mechanism 11, through the gear pairs 12. The stand 1 of the stand can be either integral or detachable. The upper and lower shafts 2 and 3 located in the frame are mounted on bearings 13 in the cassettes 14. On each side of the knees of the lower and upper shafts, support rollers 15, which cooperate with support rails 16, are rigidly fixed.

The device works as follows.

During rolling the bed 1 makes a reciprocating movement from the crank-rod mechanism 11. In this case, the shafts 2, 3 installed in the bed 1, make a reciprocating movement with the bed and the reciprocating rotational movement relative to it. In the reciprocating movement of the bed, the slider 9 also communicates reciprocating through the cam-lever mechanism 10. Since the path traversed by the slider 9 in one stroke of the stand of the stand is only part of the path, it takes 13 W

the speed of movement of the slide 9 is less than the speed of movement of the bed, and therefore in 8, forces arise, under the action of which the shafts 2 and 3 rotate and perform a reciprocating rotational movement.

The speed of movement of the slider 9, corresponding to the rate of metal flow in the deformation zone during the rolling process, is determined by the profile of the cam 17 of the cam-lever mechanism.

The working stand, as a result of matching the speeds of rotation of the rolls and the flow of metal, makes it possible to improve the quality of rolled tubes, increase the durability and reliability of the assemblies and parts of the stand.

Subject invention

The working stand of the multi-line cold-rolling mill tube containing a relocatable bed, upper and lower shafts installed in it with cantilever two pairs of working calibers, and located in the middle between the pairs of calibers, has a reciprocating rotational movement that is different reliability, each shaft has a knee in the middle, which is connected to the drive of the reciprocating rotational motion.

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FIG. 2