SU1199317A1 - Rolling/forging mill - Google Patents

Abstract

A ROLLING-FORGING MILL containing a rolling stand with several pairs of variable-radius work rolls placed on the frame of the mill, installed with the possibility of reciprocating along the rolling axis, a movable stand with articulated rods connected to it through other ends through joints working rolls; characterized in that, in order to increase the reliability of the work towards improving the quality of rolled steel, the stand is made of several parts, each of which is associated with a pair of oppositely arranged rolls and mounted on a frame that can be rotated around an axis parallel to the axes of the respective rolls and intersecting axis rolling. Axis prokati

Description

The invention relates to rolling production, mainly to step-by-step rolling mills, designed to produce billets of simple and shaped profiles with large compressions. The purpose of the invention is to increase the reliability of the mill and improve the quality of rolled products. . FIG. 1 shows a rolling forging mill, side, section; in fig. 2 is a section A — A; FIG. one; in fig. 3 - bit BB pa 2s in FIG. 4 - stand, general view. . The mill consists of a rolling stand 1 with horizontal 2 and a vertical 3 pair of variable-radius work rolls. The rolling stand 1 is installed on the frame 4 by rolls 5. The stand in this case is made of two parts 6 and 7, each of which is installed in frame 4 on the pins 8 and 9, respectively (when installed in the rolling stand of one pair of work rolls irs one chayti). Horizontally 2 and vertically 3 pairs of work rolls are pivotally connected by rods 10 and, through brackets 12 and 13, with parts 6 and 7 of the rack corresponding. Springs 14 are mounted between frame 4 and brackets 12 and 13 to install each of the parts of the rack in the initial position (perpendicular to the axis of rolling). When the mill is in operation, rolling stand 1 with working rolls 2 and 3 of variable radius performs a reciprocating movement along the rolling axis. At the same time, Meifflo with this work rolls 2 and 3 perform a rocking motion due to their hinge connection with the rods 10 and 11 with parts 6 and 7 of the rack. During rolling, the work rolls 2 and 3 rotate in the direction of the arrows (solid lines) with an increase in the radius of the rolls that are contrasted with the workpiece, and the rolling stand moves along the rolling axis to the posts 6 and 7 in the direction of the arrow (solid line). Rack construction of several parts, respectively, connected to the working axles by means of hinges and rods, and the installation of each part with the possibility of a gate around the axes parallel to the axes of the work rolls and crossing the axis of the proka enables each part of the rack independently of each other during rolling rotate in the direction of action on each part of the rack from the corresponding 1ptang greater effort. In this case, the work rolls of each pair with parallel axes will, during production, the rollers simultaneously and additionally, as well as independently of the other pair, rotate in opposite directions. Work rolls with a large torque will be further rotated in the opposite direction to their rotation during rolling. Due to the fact that the work rolls have a variable working radius along the length of the work surface, which increases as they turn during rolling, an additional turn of the work rolls in the indicated direction will lead to a decrease in the rolling radii of these work rolls. The reverse will be observed on the work rolls with a lower torque. When the rolling radii change on the work rolls, the torques on these rolls also change. Moreover, on work rolls having a high torque, this parameter decreases, and on work rolls having a torque, increases. Such a change in the torques on the work rolls takes place until the forces on the shanks are equalized, and consequently, the torques on the work rolls. In the proposed rolling-forging mill, the effect of the force of gravity of the stand on its movement is eliminated, which makes it possible to increase the leveling accuracy of the forces on the shanks and torques on the work rolls. This increases the reliability of the mill, as the rods and work rolls work in. the same conditions, and the quality of the rolled stock due to a decrease in the bending of the blanks is improved. If there are different rolling radii, for example, on a pair of horizontal rolls 2 during rolling, the torques on these rolls and the forces on the rods 10 connecting these rolls to the stand 6 will be different. Because of this, the workpiece will be bent onto a swath with a lower torque. Then part of the post 6 will rotate from the equilibrium (vertical) position on the trunnions 8. For example, if the torque is on the top of the pair of work rolls in question and the force on the rod connecting this work roll to the stand. will exceed the corresponding parameters on the lower roll and rod, then part of the rack 6 will rotate clockwise (solid line). Due to this, the upper work roll will rotate further in the direction opposite to the turn during rolling, and the lower work roll will additionally turn in the direction of the turn

during rolling. These additions. 1 turns of the work rolls will lead to a decrease in the radii of the upper work roll and an increase in the radii of the lower work roll in contact with the workpiece. Such a change in the radii will allow equalizing the torques on the considered pair of work rolls 2 and the forces on the rods 10 connecting these work rolls 2 to the part of the stand 6. If the torques on the work rolls are equal, bending of the blanks during rolling is excluded.

Similar changes will occur on a pair of vertical work rolls 3 in case of differences in the rolling radii on them.

The proposed rolling mill construction is tested on an experimental mill with

one pair of work rolls when rolling trough-shaped asymmetrical shaped profiles. The test results showed that due to the elimination of the effect of gravity of the rack on its movement, with a weight of 50 kg (this is about 5% of the force on the rod during rolling), the curvature of the resulting profiles decreased. from 40 mm to 5-10 mm per 1 m of the length of the profiles. The difference in the forces on the rods, previously approximately equal to the weight of the rack, has been eliminated in the proposed mill.

The proposed forging mill can be used in machine-building plants for rolling light-weight batches of special rolled sections.

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FIG. 2

Claims (1)

A ROLLING AND FORGING MILL containing rolling stock, a stand with several pairs of working rolls of variable radius, mounted with the possibility of reciprocating movement along the rolling axis, a movable stand with rods pivotally mounted on it, connected to other ends through hinges with work rolls, characterized in that, in order to increase the reliability of the mill and improve the quality of the rental, the rack is made of several parts, each of which is connected to a pair opposite positioned rolls and mounted on the frame with the possibility of rotation around an axis parallel to the axes of the respective rolls and crossing the axis of rolling. SU ,, 1199317