WO2007051369A1

WO2007051369A1 - A multiroll mill for hot rolling strip and plate

Info

Publication number: WO2007051369A1
Application number: PCT/CN2006/000355
Authority: WO
Inventors: Jiule Zhou
Original assignee: Shenyang Steel Co., Ltd
Priority date: 2005-11-04
Filing date: 2006-03-09
Publication date: 2007-05-10
Also published as: CN1958181A

Abstract

A multiroll mill for hot rolling strip and plate comprises a housing, upper and lower roller seats, upper and lower roll systems and a screwdown device for adjusting the work rolls gap, wherein upper and lower roll systems each include a work roll and two supporting rolls, the work rolls and the two supporting rolls of upper and lower roll systems form a triangle shape,and the diameter of the outside supporting rolls is smaller than the diameter of inside work rolls. The invention has advantages over the conventional mill for hot rolling strip and plate as follows:1.elimating bulky supporing roll systems and completely solving the problem of flexibility of rolls during hot rolling strip and plate;2.eliminating the need for the means of displacing rolls or bending rolls, thereby achieving higher rolling precision of less than 10μvm/m of tranverse errors;3.lowering the running cost of the mill, lengthening service life of rolls, eliminating the need for bulky lathes and grinding machine for rolls, thereby correspondingly reducing the manufacturing cost for the plant; 4.the range of application of the mill is very wide, solves the difficulty in manufacturing the mill for superwide strip and plate, thus being able to rolling strip and plate of width of 8000mm or less, and the structure thereof can completely substitute for conventinal mill for hot rolling strip and plate.

Description

Hot-rolled strip rolling mill technical field '

The invention relates to a rolling mill, in particular to a high-precision new six-roll hot-rolled strip mill. Background technique

At present, the structure of the hot-rolled strip mill adopts a small work roll and a large support roll. The rolling force is transmitted to the support roll through the work roll. The strength of the roll system mainly depends on the strength of the support roll, and the rigidity of the rolling mill depends on the machine. The rigidity of the frame and the roll system, to roll out high-precision hot-rolled strips requires a complex system to support.

There are many disadvantages in the above structure. The weight of the main equipment of the rolling mill is large, and the cost of the large supporting roller is high. It requires large equipment to process. Due to the structural problems of the rolling mill itself, high-precision belts must be produced, which must be supplemented by design rolls, string rolls, bending rolls, etc. In this way, a large-scale form factor is required at the same time, resulting in a large increase in investment, which increases maintenance difficulty and maintenance costs. Disclosure of the Invention An object of the present invention is to provide a high-precision hot-rolled strip mill which is suitable for rolling all hot-rolled strips, and which solves the problem that the ultra-wide strip mill equipment is difficult to manufacture. The technical solution adopted is:

A hot-rolled strip mill includes a frame, upper and lower roll holders, upper and lower rolls, and a pressing device for adjusting the roll gap of the work roll, the upper and lower rolls each including a work roll and two support rolls, The utility model is characterized in that the work roll and the support roll form a triangle, and the outer support roll diameter is smaller than the inner work roll diameter.

The above-mentioned pressing device acts on the work roll through the upper roll holder.

The roller body and the pressing device of the above-mentioned support roller are supported by a backing bearing. The present invention has the following advantages over conventional hot rolled strip mills:

1. Cancel the huge support roller system and completely solve the deflection problem of the roll during the strip rolling process with a simple pressing device.

2, the rolling mill does not need a series of rolls, bending rolls and other means, can achieve higher rolling accuracy, lateral error is less than 10 | im / m _o

3. The mill has low operating cost and long roll life. It does not require huge roll lathes and grinding machines, and the plant cost is also reduced accordingly. 4. The rolling mill has a wide application range, which solves the difficult problem of making ultra-wide strip mill equipment. It can roll strips with a width of 8000mm or less, and its structural form can completely eliminate the traditional hot-rolled strip mill.

5. The rolling mill is also suitable for the finished pass of section steel rolling, which can meet the requirements of rolling high-precision steel. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of an embodiment of the present invention.

LIST OF REFERENCE NUMERALS 1 - rolling stock; 2 - work roll; 3 - support roll; 4 upper roll stand; 5 - press down device; 6 - frame; 7 - lower roll stand. Implementation method

Referring to Figure 1, a hot rolled strip mill of the present invention comprises a frame 6, an upper roll stand 4, a lower roll stand 7 and upper and lower roll trains. The upper and lower rolls each include a work roll 2 and two support rolls 3, and the outer side of the work roll 2 is in contact with the inner sides of the two support rolls 3, and the inner work roll 2 has a larger diameter than the outer two support rolls 3. The diameter of the rolled piece 1 is sandwiched between the work rolls 2 of the upper and lower rolls. A pressing device is disposed between the upper roller holder 4 and the frame 6, and the pressing device is well known to those skilled in the art, so that the expansion device 5 can be used to adjust the size of the work roll gap. The maximum rolling force experienced by the non-transmission roller is mainly determined by the maximum bending stress that the roller can withstand. By adjusting the upper and lower roller seats and the pressing position, the maximum bending stress that the roller can withstand can be It does not constitute a limitation of the strength of the roll, and the work roll in the middle mainly satisfies the transmission problem. Thus, the conventional bulk support roll is replaced by two small support rolls, which greatly saves the roll material. Industrial applicability

The invention provides a high-precision hot-rolled strip mill, which is suitable for rolling all hot-rolled strips, and solves the problem that the ultra-wide strip mill equipment is difficult to manufacture.

Claims

Rights request

1. A hot-rolled strip rolling mill comprising a frame, an upper and lower roll stand, an upper and lower roll system and a pressing device; the upper and lower rolls each comprise a work roll and two support rolls, and the pressing device is arranged on the upper roll stand and the machine Between the racks, the work rolls of the upper and lower rolls and the two support rolls form a triangle, and the diameters of the two outer support rolls are smaller than the diameter of the inner work rolls.

A hot strip mill according to claim 1, wherein said pressing means acts on the roller of the work roll through the upper roll holder.

A hot strip mill according to claim 1, wherein the roll body and the pressing means of the support roll are supported by a backing bearing.