RU2352411C2 - Method of transposition of screw rolling two-high stand with bed of closed type - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: method is implemented in the following way. Cartridges with working roll from run position "a" is transferred from rolling axis into extreme conducted position "b" for distance ΔL. By means of well-known facilities cartridges with working rolls are taken out in horizontal plane out of bed overall dimensions on-the-mitre α=0-45° to rolling axis, that provides to avoid adjoining to equipment rolling mill. Installation of new cartridges with working rolls is implemented in inverted sequence. Operations of transposition are implemented simultaneously for two cartridges with working rollers.

EFFECT: reduction of delay for transposition and increasing of annual capacity of aggregate in whole.

3 dwg

Description

The invention relates to the field of metal forming, and more specifically to rolling production, and can be used in two-roll working stands of helical rolling mills with a closed frame for pipes and round rolling.

Two-roll stands of helical rolling with a bed of a closed type have a higher rigidity compared to similar stands with a bed of an open type, which allows them to get more accurate rolling, that is, rolling with a narrower tolerance field. However, such stands are more difficult to maintain, in particular, a significant amount of working time is spent on the transshipment operation (replacing worn rolls with new ones), which reduces the annual productivity of the rolling unit as a whole.

A known method of transshipment of a twin-roll stand of helical rolling with a bed of a closed type, described in RF patent No. 2129052, MKI B21B 19/04, decl. 03/18/98, publ. 04/20/99

This method includes turning the work rolls assembly with cushions, traverses and cassettes together with the bed, the stand in a vertical plane by 90 ° and removing the work rolls assembly with traverses from the stand bed up, that is, in the direction perpendicular to the rolling axis.

The practical implementation of this method in the design of the working stand shown in the drawings attached to the specified patent shows that this method of transshipment has a significant drawback, namely, the significant cost of working time for transshipment, which is associated with the use of manual labor in a number of operations, namely :

- it is necessary to free all the fixture of the stand frame to the supporting frame;

- rotate the frame relative to the support frame using unspecified lifting devices using manual labor, since special devices combined with the stand are not provided for by the patent;

- after turning the bed of the stand, it is necessary to manually disconnect the traverses with work rolls from the cassettes, and the rolls must be hung out using an electric bridge crane;

- all operations are repeated in the reverse order to install new rolls assembled with traverses.

These handling characteristics are the cause of significant losses of working time for transshipment and, as a consequence, a decrease in the annual productivity of the entire rolling unit as a whole.

There is also known a method of transshipment of a twin roll stand of helical rolling with a bed of a closed type according to US patent No. 4387584, M. cl. 72-100, claimed 10.20.81 g., Publ. 06/14/83, including the alternate movement of the cassettes with the work rolls on the transport carriage and their removal outside the dimensions of the cage bed in the direction perpendicular to the rolling axis. When installing new cassettes with work rolls, all operations are repeated in reverse order.

The disadvantage of this method of transshipment of the mill is the significant cost of working time for transshipment, which is caused by a large number of sequential operations. This drawback leads to a decrease in the annual productivity of the rolling mill as a whole.

Of the known methods of transshipment of twin-roll stands of helical rolling with a bed of a closed type, the closest in technical essence is the method described in the patent of Germany No. 3225447, MKI B21B 19/02, decl. 07/07/82, publ. 01/27/83

This method of transshipment of twin-roll stands of screw rolling with a closed bed includes the alternate movement of the cassette with the rolls onto the rails of the base plate and moving them outside the dimensions of the bed of the stand in the direction perpendicular to the axis of rolling. On the cassette rolls installed rollers that interact with the rails of the base plate. The installation of new cassettes with rolls is carried out in the reverse order.

A disadvantage of the known method of transshipment of a twin-roll stand of helical rolling with a bed of a closed type is the significant loss of working time caused by the need to perform a number of sequential operations during transshipment, namely:

- moving the lower cassette with the roll to the interaction of its rollers with the rails of the base plate;

- removal of the lower cassette with the roll beyond the dimensions of the stand bed;

- breeding of guide discs for free movement of the upper cassette with the roll;

- moving the upper cassette with the roll to the interaction of its rollers with the rails of the base plate;

- removal of the upper cassette with the roll beyond the dimensions of the stand frame;

- installation of new cartridges with rolls in the reverse order.

Significant loss of working time reduces the annual productivity of the unit as a whole.

The objective of the present invention is to provide a method of transshipment of a twin roll stand of helical rolling with a bed of a closed type, which allows to reduce the loss of working time for transshipment.

The problem is achieved in that in a method of transshipment of a twin-roll stand of screw rolling with a bed of a closed type, comprising moving cassettes with rolls in a horizontal plane and moving them outside the dimensions of the stand bed and installing in the reverse sequence of new cassettes with rolls according to the invention, moving cassettes with rolls in the horizontal plane is carried out in the extreme divorced position from the axis of rolling, and their removal outside the dimensions of the stand frame is carried out simultaneously at an angle α = 0-45 ° to the rolling axis, on either side of it.

This embodiment of the method of transshipment of a twin-roll stand of screw rolling with a bed of a closed type will reduce the loss of working time, and therefore increase the annual productivity of the unit as a whole.

This is achieved due to the fact that all operations to replace old cartridges with worn rollers with new ones can be carried out simultaneously for two cartridges with work rolls at an angle α = 0-45 ° to the rolling axis, as well as by reducing the number of operations. At an angle α = 0 °, the working stand is structurally simpler, since special mechanisms for turning the cassette with the roll in a horizontal plane relative to the rolling axis are not required. Other values of the angle "α" can be selected when designing the whole complex of equipment of the rolling mill, the design of which is regulated by the technological scheme of the process, the location of the main drive, and the cost of minimal time for transshipment. At an angle α> 45 °, the length and transverse dimensions of the stand are increased due to the increase in the stroke of the pressure screws of the mechanisms of radial movement of the cartridges with work rolls and, as a result, the rigidity of the stand decreases, which is undesirable.

To explain the invention, an example of the method is described below with reference to the accompanying drawings, in which:

figure 1 shows a General view of a two-roll stand of helical rolling with a bed of a closed type (rolls are divorced in position "b");

figure 2 is the same, a section aa in figure 1 (rolls are advanced from the stand);

figure 3 is the same, a view along arrow B in figure 2.

The method of transshipment of a twin roll screw rolling stand with a bed of a closed type is as follows. Cassettes 1, 2 with work rolls 3, 4 from the operating position "a" (shown in dashed line in Fig. 1) are moved from the rolling axis to the extreme diluted position "b" by a distance ΔL. Known means, for example, hydropneumatic actuator, chain, rack, rope, etc. cassettes 1, 2 with work rolls 3, 4 are simultaneously displayed in a horizontal plane outside the dimensions of the frame 5 at an angle α = 0-45 °, which allows you to bypass adjacent to the working stand equipment on both sides of the rolling axis "b".

Installation of new cartridges with work rolls is carried out in the reverse order.

The indicated transshipment operations are carried out simultaneously for two cassettes with work rolls.

The proposed method of transshipment of a twin-roll stand of helical rolling with a closed bed in comparison with the known ones can significantly reduce the loss of working time by reducing the number of operations and due to the possibility of simultaneous transshipment of two cassettes with work rolls at once.

Reducing the time for transshipment will increase the annual productivity of the unit as a whole.

Claims (1)

A method of transshipment of a two-roll stand of helical rolling with a bed of a closed type, including moving cassettes with rolls in a horizontal plane, moving them outside the dimensions of the stand bed and installing in the reverse sequence new cassettes with rolls, characterized in that the cartridges with rolls are moved in a horizontal plane in the extreme divorced position from the axis of rolling, and their removal outside the dimensions of the frame of the stand is carried out simultaneously at an angle α = 0-45 ° to the axis of rolling, on both sides of it.

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