SU47630A1 - Reversible plate rolling mill - Google Patents

Description

The currently used method of hot rolling a strip material is that the heated billet is fed to a rolling mill consisting of a large number of stands forming a continuous mill, i.e. a mill where the metal is rolled simultaneously in several cages. Such mills require large capital expenditures, and their productivity is relatively small and is limited by the capacity of the last stand. The last stand operates at maximum speed, while the remaining stands are successively decreasing, since the closer to the beginning of the mill, the shorter the rolled strip. For this reason, most of the stands of such a continuous mill operate at a speed significantly lower than the maximum possible, while the proposed mill can operate at maximum speed or at a speed close to the maximum at each pass.

In addition, continuous type mills require a lot of space.

The proposed mill has a relatively simple compact design, preferably with only one crimping stand, although in some

(233)

In some cases, it may be desirable to distribute this work to two stands. On such a camp, each pass can be made at a rate determined only by the power consumption and not limited to the next stand.

Preferably, doppel-duo reversing type mills are used, although other types can be used, such as trios, on which the workpiece is fed alternately between the upper and middle and between the lower and middle rollers.

Reducing the cross-section of the workpiece by passing it through the rolls in opposite directions is, of course, well known, but the degree of compression is always quite severely limited by two factors, namely, stretching the workpiece to such an extent that its length makes it difficult to manipulate, and heat loss to lowering the temperature at which further rolling becomes difficult.

In the proposed mill, these difficulties are eliminated by the fact that the billet is first rolled hot. JC € x ti on smooth rolls for crimping to a thickness that can be wound, and, so that, in this case, the burner is “eaten in“ a 1 si

with reel for further crimping. Preferably, the reel is installed on both sides of the mill, and after the initial rolling in smooth rolls, the material is wound and reeled up with each pass, it is fed from the riot to the mill and at the exit on the other side is wound again.

When designing continuous mills, rapid cooling is taken into account due to the fact that the entire surface of the material is subjected to the cooling effect of the atmosphere. In view of the fact that as the blank thickness decreases, the area of the cooling surface per unit volume increases, heat is lost rather quickly.

If the material is wound, then the air-cooled surface constitutes only a small part of the entire surface of the strip. Further winding allows the use of relatively short tables, which saves space and reduces costs. To further reduce heat loss and minimize the formation of dross, the reel is placed in heated chambers.

From the point of view of heating, the supply of hot material to the mill in the form of a blank is a great advantage. Uniform heating of a riot is practically impracticable, since the ra always turn out to be too hot and the temperature of the material in the riot is uneven either in the longitudinal or in the transverse direction. When billet, on the other hand, achieving uniform heating with minimal scale formation is achieved relatively easily.

For high-speed operation, a force-operated device is required to feed the end of the wound strip to the mill. In the proposed mill, exciting rollers on both sides of the stand are preferably used for this purpose. In practice, the carter will work to feed the material in one direction and continue rolling until the rear end “e comes out of the squeeze rolls, but, he will stop the mill before the strip. out of the gripping rolls; reversing exciting rolls,

he can feed the material back to the mill.

The pickup rollers maintain the material in a tensioned state, which is highly desirable, since it provides a straight strip and greatly simplifies handling, - The pickup rollers on the upstream side are designed to pull the material forward, and the pickup rollers from the inlet side brake t its movement. Thanks to this, the right lane comes out of the camp. If there is some unevenness in the strip in the cross section along the length of the strip, resulting in excessive rolling speed, then it will be eliminated completely or to a great extent.

At the beginning of rolling, while the billet is relatively thick, it is quite tough even at temperatures about rollers and exciting rolls can push it forward very quickly. When the material becomes thin, it tends to bend when it leaves the mill or the exciting rolls, if the reel does not wind it at the same speed as it comes out. The reel must grab material forcibly and without delay. In the proposed mill, a reel is used in this way, and in addition it can work in conjunction with descaling devices between passes, which provides against the roll-in of the scale into the surface of the strip. However, such a winding mechanism works satisfactorily only when the material has already become relatively thin. There is some intermediate stage of crimping between crimping a thick billet and winding a thin material, during which, in order to save heat and reduce the length of the roller tables, it is advantageous to use strip winding in riots. For such a material of average thickness, the same reel is used, but they work in the opposite direction, as will be described in more detail below.

P rokatka mattera.l a, yes ,. smooth swaths at high speeds is associated with necrotic difficulties, you need to overcome it, learn to

This is because as the thickness of the rolled material decreases, its width increases. At the beginning of rolling, when the length of the workpiece is still relatively small, the accuracy of feed to the rolls is not so important, but as the length of the workpiece increases, its exact direction to the rolls becomes more and more important. To do this, use side guides, which to exit the workpiece must be located at a distance from each other, only slightly larger than the width of the supplied workpiece. On the downstream side of the mill, the distance between the rulers should be larger to prevent curvature.

The mill has automatic controllable rulers that meet these requirements.

In FIG. 1 is a top view of the rolling mill; FIG. 2 is a longitudinal section of a part of the mill on an enlarged scale; FIG. 3-diagram of the workflow; FIG. 4-vertical longitudinal section of the cage with one of the reel; FIG. 5 is a top view, partly in section, of the installation shown in FIG. four; FIG. 6 is a top view of a part of one of the live rolls with rulers; FIG. 7- emphasis for rulers.

The reversible sheet rolling mill consists of a stand 52 with beds 53 carrying work rolls 54 and supporting wheels 55 (FIG. 1-3). The anvil rolls are preferably supplied with anti-friction bearings. The mill is equipped with pressure screws 56 driven by an electric motor 57 directed from the console 58, which allows for quick adjustment of the mill setting. Work rolls 54 are driven from motor 59 through gears 60, 61 and spindle.

On both sides of stand 52 there is a roller table 63. On each side of the mill there is a pair of rolls 64, 68 located at some distance from the work rolls 54. Between the stand and rolls 64, 68 are placed rollers located at a relatively close distance from each other 65 of the roller table, and behind them are located at a large distance from one another rollers 66 and 67. Rolls 64, 68 work as gripping for feeding the material, and rolls 68 are shifted in the vertical plane. At the beginning of rolling, one of the roller tables 63 is supplied with hot grinding, which is transmitted by the roller table to the mill, which squeezes and pulls it, after which the billet goes to the roller table 63 from the opposite side. The mill is then reversed and the described operation is repeated until the section of material is reduced so that it can be rolled up. Upon reaching this crimping stage, the material is retracted upward from the plane of the roller tables 63 to the reel 69 placed in heated chambers 70 located above the roller table 63. The reel consists of drums 71 mounted on shafts 72 driven through a gear drive from the motors 73.

The arrangement of the pick-up rolls is shown in FIG. 4. The rollers 64 are driven by the motors 77 (Fig. 1) through the gears 7S, the coupling sleeves 75 and the spindles 76. The motors 77 are controlled from the rolling console 5 in the same way as the motors 73 and 59.

The rollers 68 are mounted in bearings 79 that are rebuilt in the beds 80. From each bearing upward, the rod 81 of the piston 82 in the upper part of the stand 80 of the cylinder 80 80 is up. from the rolling console 58. In order to simultaneously raise and lower both bearings 79 of the roll 68, these bearings are connected to each other. Each bearing is provided with a bolt 84, passing through the block, which can move in the forked end of the lever 55.

The levers 95 are located on the swing shaft 87 so that the bearings 79 can move up and down only simultaneously.

Each drum 71 consists of disks 88 spaced apart from each other and connected by prismatic rods 89. The drums can be driven in both directions.

At each roller table 63, there is a diverter 90 guiding the material to the reel. Each diverter consists of a serrated bba equipped with circular grooves in which the chain teeth 91 are placed. A frame 92 is rotatably mounted on the shaft 93 of the toothed shaft. The carrier carries a roller 94 with grooves corresponding to the grooves of the toothed wheel 66a. The chains 95 run down the rollers, the upper branch of which lies in the plane of the table when the frame 92 is in its lower position. The frame 92 is connected by a lever 96 to an angle lever 97 controlled from a hydraulic cylinder 98. The latter is controlled from a console 5. When the strip of material is required to be wound, a liquid under pressure is supplied to the cylinder 98. The angle lever 97 turns counterclockwise (Fig. 4 ) and turns the frame 92 on the shaft 93 upwards. This leads the diverter to the position shown in FIG. 4 with a dashed and dashed line, and directs the front end of the material into chamber 10. Winding should preferably begin when the material has a comparatively greater thickness, about 20 mm. For such material, the reel 69 is driven in the direction shown by the dotted lines. The front end of a relatively thick and rigid strip passes between adjacent rods of the drum 7 /. The circumferential speed of the drum is approximately equal to the speed of the material entering it, which is wound up as it is fed by the pick-up rollers. At the end of winding in one direction, the gripping rollers and the mill are moved in the opposite direction, and the material is fed back to the rollers for the next pass.

When the cross section of the material is reduced so much (approximately to 12 mm) that it can be bent steeply, such bending will be desirable for separating scale.

Therefore, when the material is rolled to a thickness of about 12 mm, the receiving bar V is rotated in the direction indicated by the solid arrow; the winding is made at an arbitrary tangent. The front end of the rolled strip passes between the rods of the drum 7 /, the rotation of which

duplicates the strip, bending it on the edge of one of the rods 69 (see X-X in Fig. 4). After that, the material goes around a roll that cracks over dross 88. When the material reaches the specified cross section, the issue of formation of dross becomes important. If the dross is not removed between the gaps, it will roll into the strip and, in addition, damage the work surface of the work rolls. The formation of a small amount of scale at the end of rolling has a relatively small value, but the re-transmission of material with scale through the rolls should not take place. The bending of the material around the roll 99 breaks down the scale and it falls off or is dropped before the next pass, which gives a cleaner product and increases the service life of the rolls.

The distributor is expected to stop material immediately after the rear end of the work rolls 54 comes out before it comes out of the exciting rollers 64 and 68, but if the distributor does not do it in time and the strip will turn out completely wound, then the outer end can be easily captured with pliers through the gap 100 and feed back to the pick-up rolls.

The chambers 70 are built of refractory material, and the required temperature is maintained in them by means of burners 102. The fuel consumption in these ka: measures will be relatively small, as the material rolls on this mill with a high deformation rate, therefore the amount of rolling energy that is transformed into heat, will be sufficient to noticeably slow down the cooling, especially since a relatively small part of the strip is subjected to the cooling effect of air in the gap between the exit from the rolls and the end of the winding.

The hollow shaft 72 of the reel drum is equipped with J03 insulation and a safety coupling} 04. Air or water can be passed inside the shaft 72 to cool the shaft, and insulation J03 prevents the cooling of the inner layers of the metal riot.

Practice has shown that bending the material back through the rods 89 to grip the drum strip does not adversely affect the material, since the strip does not bend at too sharp an angle, and the metal also has a high temperature, and the deflection is eliminated by subsequent rolling. .

The device of the side-conveyor rolls 63 is shown in FIG. 1, 2, 5 and 6. The roller conveyors of the mill are driven by motors 73. Roller 64, which is the lower pick-up roller, is connected by a gear W5 to rollers 65 and also drives rollers 66 and 66a through bevel gears J08. The rollers 67 are actuated in the same way or can be operated by a special motor.

The guiding device consists of metal bars J09 connected to parallel bars, rotatably mounted at /// points on brackets 7/2; attached to the sides of the roller conveyor of the J09 line on the rollers 67. The roller conveyor shown in FIG. 5 is located on the left side of the mill (FIGS. 1 and 2) and the position of the rulers, shown by the solid line, is their open position to receive material. Assume that the billet lies on the rail itself and is required to be submitted to the camp. The rollers 67 are started in such a direction as to move the material to the right. Due to the friction between the rulers 109 and the rollers of the ruler, they are also addicted to the right, turning on software slots. This leads them to the position shown by dotted-dashed lines; it can be seen from the drawing that in this position the rulers are much closer to each other and can accurately guide the material. Further movement of the rulers is limited by the stops 7 / J, consisting of boxes / 75 pinched to the roller table with buffers 775.

If the rollers 67 are actuated in the opposite direction, the rulers move to the left (Fig. 5) and rotate back into the position shown by solid lines, this movement limited by stops 7 / J. The rulers are provided with pads 777 adjacent to the stops when the rulers are in their internal position. The tippers 770 have, at the outer end, an additional opening or pivot mount holes at point 777, which allows their effective length and, thus, the distance between the rulers to change. The rolling table, as can be seen from FIG. 7, is provided with a number of holes for repositioning the stops 775.

The initial angular position tg on one side of the roller table is different from the initial angular position mn on the other side of the roller table. This is due to the fact that when the gigs move from the position shown by the solid line to the position shown by the dashed-dashed line, they move inward until the pull goes to the position perpendicular to the roller axis and then somewhat outwards, when the rods move from such a perpendicular to a rest position.

If the angular position of the tg on both sides of the roller table were the same, then they could be in a perpendicular position at the same time, and then the rulers could come so close together that they would interfere with the movement of the material. With the device shown, this possibility is excluded. The ruler in the upper part (Fig. 5) comes to the internal position somewhat earlier than the ruler located on the opposite side. At the same time, it comes in contact with the edge of the rolled material and gives it proper direction, and then, when it comes to rest, moves somewhat away from the rolled strip, which moves further completely free to the mill, but the ruler limits its lateral displacement to the slight gap resulting from t g from the perpendicular position. The ruler shown at the bottom of FIG. b, also comes in contact with the edge of the strip if the latter moves in the wrong position and thus gives it the proper direction.

The heated workpiece is fed to one of the tables 63 and moves in the mill and

forward, and the rollers 54 gradually approach each other with the help of pressure screws, reducing the cross section of the strip and drawing it out. The gaps are made quickly with a minimum loss of time, so that the strip is brought to a thickness that can be wound without significant cooling. The deflectors are then activated and fed to the outgoing strip on one of the reel, after which the rolling is continued, feeding the strip with the help of grabbing rolls from one reel to another. At the end of the rolling, the material is left after the last pass to the left roller table 63 and to the centerless reel 118 of conventional construction, from which it can be removed.

The subject matter of the invention.

Claims (3)

1. Reversible sheet rolling mill equipped with heated muffles with reel for winding metal at each pass and using a deflector of the rolled strip from the rolling line, characterized in that the diverter is made in the form of a frame 92 with rotating bba and 94 carrying an endless chain bbb, connected through a system of levers 96, 97 with a hydraulic cylinder 98. 2. In the mill according to claim 1, the use of a guide device made in the form of two lines 109 sliding along the roller table, hinged 110 by puffs 110 with the brackets // 2 and receiving the friction by the rollers 67 of the roller table. 3. In a reverse sheet rolling mill in PP. 1 and 2 use adjustable gripping rollers 64, 68 placed between the heating furnaces and the mill stand and serving to grip the ends of the rolled material and re-feed to the work rolls 54 (FIG. 3). to the patent of an inn-th firm, the company for metal processing No. 47630 to the patent of an inn-th company, the cold metal processing company No. 47630 67 Phi 6ff g 4 patent j-ti jjf of the company ,, JVs 47630 cold metal working company