RU2441723C1 - Rolling mill of cold pilger mill - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to the rolling mill of cold pilger mill. Rolling mill includes reciprocal moving buckle plate with operating and support rolls and power stand comprising basis and cap with supporting rail, vertical stands connecting basis and cap, mechanism of cap position adjustment and mechanism of rolling only with direct move of the buckle plate. Possibility to eliminate hinge joints from the mill drive and thus to increase its reliability is ensured by the fact that the basis of the stand includes additional body with supporting rails at two eccentric shafts with bearings in the basis of the stand and general impulse rotation drive. At this support rails are installed in contact with lower support rolls of the buckle plate.

EFFECT: increased reliability of cold pilger mill construction.

1 dwg, 3 dwg

Description

The invention relates to rolling production and for improving the working stand of a cold pilger mill.

A known design of the working stand of a cold pilger mill with a mechanism that excludes deformation during the reverse stroke (see patent RU No. 2220795, B21B 21/00, 04.06.2002).

According to the patent, the working stand is made with a movable power bed with support rails and a displacement drive, a movable cassette with a deforming tool and a lever-hinge synchronization system for moving the movable power bed and cassette, which includes a swinging lever with bearing supports and connecting rods.

The swinging lever with its bearings is mounted on an eccentric shaft equipped with a pulse rotation drive.

A disadvantage of the known design is that when rolling in gauges with a low taper of the stream, in order to exclude contact between the gauges and the pipe, a significant increase in the eccentricity in the support shaft of the swing arm is necessary and, as a result, the loads in the drive of the mill increase significantly.

Of the known designs of the working stand of the cold pilger mill with a mechanism that excludes deformation during the reverse course of the stand, the closest is the technical solution described in French patent No. 1228595, class. B21c, publ. in 1960).

In a known design, the working stand is made with a movable roll cassette with work and backup rolls and a stationary power bed with support rails, along which the rolls of the cassette roll over during operation. Between the supporting rails and the bed, wedge mechanisms with a drive are installed. Before the straight run, the rails are installed at a minimum distance from each other. Before the reverse stroke of the cassette, the rails are parted to a distance that ensures the absence of contact between the gauges and the pipe. Thus, during the reverse stroke, there is no effect of axial forces on the pipe and rolling of especially thin-walled pipes and pipes from materials with a low modulus of elasticity is ensured only with a direct stroke of the working stand.

The disadvantages of the known designs include:

1. Significant weight and dimensions of a stationary power bed.

2. To ensure the movement of the rails, the lever-cam mechanism of the reciprocating movement of the wedges is used, having a large number of hinges, as a result of which its reliability is reduced.

The objective of the present invention is to create a working stand cold-pilger mill, providing increased reliability of the mill.

The problem is achieved in that in the working stand of a cold pilger mill, comprising a reciprocating cassette and a stationary power bed, including a base and a lid with support rails, a mechanism for adjusting the position of the lid and vertical racks connecting the base and the lid, according to the invention in the base of the bed, an additional housing with support rails is mounted on two eccentric shafts with bearing bearings in the base of the bed and a general pulse drive of rotation, at ohm support rails are installed in contact with the lower support rolls of the cassette.

To explain the invention, the following is a specific example of a working stand with reference to the accompanying drawings, in which:

figure 1 shows the working stand of the cold pilger mill, a longitudinal section along the rolling line;

figure 2 is the same, a section along aa in figure 1;

figure 3 is the same, a section along BB in figure 2.

The working stand of the cold pilger mill contains a movable cassette 1 and a power stationary bed 2. The cassette contains work rolls 3 and 4, backup rolls 5 and 6, a housing with guides 7, balancing springs 8. The stationary frame 2 contains a cover 9 with support rails 10 , cover movement mechanisms 11 and 12, vertical struts 13 and 14, base 15. In the opening of base 15 there is a housing 16 with support rails 17. The housing 16 is mounted on two eccentric shafts 18 and 19 with end gears 20 and 21. The pulse drive 22 is gear wheel 23 connected h Through the gears 20 and 21 to the eccentric shafts 18 and 19. The eccentric shafts 18 and 19 with their bearings are placed in the base 15.

In the process of operation of the mill, the cartridge 1 moves reciprocatingly, in contact with the backup rolls 5 and 6 with the rails 17 and 10 of the stationary frame 2. Before starting a direct stroke, the eccentric shafts 18 and 19 with the help of the drive 22 are installed through gears 23-20 and 23-21 so that the eccentricities "e" are in their highest position. Regarding this position, the cover 9 with the supporting rails 10 by means of the actuators 11 and 12 is installed relative to the supporting rails 17 at a distance necessary to obtain high-quality rolled products. Work rolls 3 and 4 are in contact with the metal and carry out its deformation.

Before starting the reverse stroke of the cassette 1, the shafts 18 and 19 with the help of the drive 22 through the gears 23-20 and 23-21 are set so that the eccentricity "e" occupy the lowest position. The housing 16 with the support rails 17 is moved to its lowest position. Under the influence of balancing springs 8 and its own weight, the support roll 5 and the work roll 3 follow the support rails 17, a gap is formed between the work rolls 3 and 4, therefore, during the reverse stroke of the cartridge 1, deformation does not occur. Next, the cycle repeats.

The design of the working stand of the proposed design allows the drive to eliminate deformation during the reverse stroke of the cassette without swivel joints and thereby increase the reliability of the working stand.

Claims (1)

The working stand of the cold pilger mill, including a reciprocating cassette with work and backup rolls and a power bed, comprising a base and a cover with support rails, vertical racks connecting the base and the cover, a mechanism for adjusting the position of the cover and a mechanism for rolling during straight cassette, characterized in that in the base of the frame is mounted an additional housing with support rails on two eccentric shafts with bearing bearings in the base of the frame and a common imp lsnym rotary drive, wherein the support rails of the additional housing mounted in contact with the lower backup rolls cassette.

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