RU2102164C1 - Method for reversing rolling in adjacent passes of simple sections - Google Patents

Abstract

FIELD: metallurgy; may be used in two-high or three-high mill stands in intermediate or in leader-finishing passes, mainly, in rolling of rounds or squares. SUBSTANCE: workpiece moves over roller table and thrusts impingement plate inclined to workpiece axis with vertical wall having opening towards finishing pass. In so doing, force normal to inclined surface of impingement plate of supporting response, proved at an angle to workpiece axis, tilts the workpiece through angle of 90 deg and in this position, rolling is effected in opposite direction in finishing pass. EFFECT: higher efficiency. 3 dwg

Description

 The invention relates to the field of metallurgy and can be used in stands of a duo or trio in intermediate or pre-finishing finishing calibers, mainly when rolling round or square steel. In duo stands, the method is applicable for the reciprocating movement of the peal between calibers. The method can also be applied when rolling other profiles.

 In the book of A.P. Chekmarev, M.S. Mutiev, R.A. Mashkovtsev "Calibration of rolling rolls", M: Metallurgy, 1971, p. 178, Fig. 73, various methods of rolling round steel are indicated.

Here, after each caliber, the schemes provide a 90 ^° roll over.

 The closest rolling method to the claimed (prototype) is the method of rolling round steel, shown in Fig. 73 b

Here, the oval gauge is used as the finishing gauge, the roll from which, after tilting by 90 ^o, is set to the final round gauge, where it is rolled.

The disadvantages of this method include the fact that the peal obtained in the oval caliber must be scanned 90 ^° before the finishing gauge and held in this position until rolling. This operation in the absence of mechanical tilters is carried out manually, which takes a lot of effort and additional time; this results in a decrease in performance.

 The task to which the invention is directed is to facilitate working conditions and increase productivity.

The technical result in the implementation of the invention is characterized by a combination of facilitating working conditions and increasing productivity due to the fact that after rolling the roll in the pre-finish gauge in the "flat" position, the roll, moving along the rolling table, abuts against the vertical wall inclined bump axis and with the opening in the side of the finishing gauge, the end of the roll bends upward along the axis of lesser resistance; while normal to the inclined surface of the chipper force support reaction, being at an angle to the axis of the roll produces canting roll in the direction of the final caliber at an angle of 90 ^o . The tipping is also facilitated by the moment from the weight of the hook formed at the end of the roll. In such a stable position due to the hook, they carry out the task of rolling and rolling it in the opposite direction in the finishing caliber. At the same time, the work of the rollers is facilitated, since the tilting of the roll occurs automatically and there is no need to hold it.

 Thus, the claimed method meets the criterion of "novelty." When studying other well-known technical solutions in this technical field, the features that distinguish the claimed solution from the prototype were not identified and therefore they provide the claimed technical solution with the criterion of "inventive step".

 In FIG. 1, 2, 3 in a somewhat exaggerated form presents the proposed method of reverse rolling peals.

 In FIG. Figure 1 shows a side view of a roll of an oval or rhombic strip emerging from the gauge onto a “die”, which, moving along the indicated arrow, bends upward due to a meeting with the vertical wall of the chipper coupled by a smooth arc with the plane of movement of the profile and turned towards the second caliber. The distance from the axis of the rolls to the chipper is indicated by L, and the length of the roll l. In this case, the ratio of these values l ≤ L must be observed so that the walls of the caliber do not interfere with the tilting of the strip.

In FIG. 2, a thick dashed line shows a top view of a rhombic cross-section strip emerging from the rolls and a strip ^o -scanned by 90 ^° (shown by a thick solid line).

 In FIG. 3a shows the strip transferred by the slappers to the finishing gauge for rolling a circle (solid lines) and a square (dashed lines) (Fig. 3b).

In FIG. 1, 2, our opinion has shown quite convincingly that a strip moving away from the rolls, having encountered an inclined chipper with a smooth entrance from the slab floor, bends around the axis of lesser stiffness upwards, resulting in a force P perpendicular to the inclined surface of the chipper. This force acting on the strip at an angle is decomposed into a component P _k , which turns the strip around the longitudinal axis at an angle of 90 ^o . The angle of inclination of the chipper in the plan, in our opinion, depends on many components and should fluctuate within α = 30-60 ^o . For large values, the strip can bend to the side without tipping, i.e. the bend will be on the axis of greater resistance to the roll section. When the values of the angle d are less than the minimum, a force P _{k of} insufficient force is possible to carry out the tilting of the roll.

A specific example of the method has been tested at the mill 360 of the finishing mill for rolling square roll 40 x 40 mm and consists in the following: a 44 x 70 mm rhombus coming out of the finishing mill with a large horizontal axis and a length of l 13 m abuts against an inclined bump installed at an angle a = 53 ^o at a distance from the axis of the rolls, equal to L 14 m, as a result, a hook K 200 m long is formed at this end of the roll and under the action of the force P _{k the} roll is automatically tilted 90 ^o and kept the hook from falling off Then, with the help of slippers, he moved to the finishing gauge and set the other end into the finishing gauge, where he rolled. The bent end of the roll before reverse rolling, moving between the rollers of the roller table, slides along the slab floor, holding the strip in a chanted position. The role of the roller was limited only to monitoring the rolling process and to minor intervention in the event of any violation.

Using the proposed method of reverse rolling provides the following advantages compared to the existing one:
facilitation of working conditions;
increase in productivity since tilting of the roll and its holding is carried out automatically without any mechanisms;
expanding the possibilities of rolling production in the field of reverse rolling of a wide range of profiles of circles, squares and others in mills duo and trio.

Claims (1)

A method of reversing rolling in adjacent calibers of simple varietal profiles, including passing the profile through the first oval or rhombic gauge in the flat position, tilting it 90 ^° to the "on edge" position and the inverse problem and skipping in this position to the second oval or rhombic rib gauge, characterized in that after exiting the first gauge, the front end of the profile is bent upward by focusing it on the go in a vertical bump, deployed towards the second caliber and paired with a smooth arc with the plane of movement of the profile I, for his self-edging.

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