SU1696020A1 - Roll unit - Google Patents

Abstract

The invention relates to rolling production, in particular, to rolling sheets (stripes) in two-roll and multi-roll cages, and can be used in the production of varietal profiles. The goal is to reduce the consumption of rolls by maintaining the working length of the roll with shoulders when regrinding. When the diameter of the upper roll 1 decreases in the process of regrinding, it is possible to simultaneously remove the described section of the end surfaces, if the size of the regrind corresponds to the height of the worn-out ca on the front inclined surface. If the wear height is greater than the regrinding depth, then the inclined face surfaces of the upper roll 1 should be ground. In this case, a new LB size will be obtained, smaller than the original C. Lower roll 2 is sharpened (reduced DiDK) to remove the worn out layer. The axial distance between the points of the inclined end internal surfaces of the shoulders is reduced, which makes it possible to restore the size LH. 1 il. (/

Description

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The invention relates to rolling production, in particular, to the rolling of sheets (stripes) in two-roll and multi-roll cages, and can be used in the production of varietal profiles.

The purpose of the invention is to reduce the consumption of rolls by maintaining the working length of the roll with shoulders when regrinding.

The drawing shows the roller node cage strip rolling mill.

The roller assembly includes an upper roller 1 with inclined end surfaces and a lower roller 2 with shoulders 3. The inclined end surfaces of the roller 1 are parallel to the inner surfaces.

rolls 3 of roll 2, and the length of the barrel LB of roll 1 is equal to the distance LH on the lower roll 2. The presence of inclined internal surfaces on the shoulders ensures unimpeded entry of roll 1 into the roll of roll 2. Angle of end bevels is 0.4-16.8 °.

Roller node works as follows.

After installing the stand in the position shown in the drawing, begin the process of rolling the strip 4, In this position, the roll

1 shifted relative to the rolling line to the left in the direction of arrow A, and roll

2- to the right along arrow A. When the rolls are rotated 180 °, the rolls 1 and 2 are displaced one relative to the other and relative to the strip in the direction B. Thus, in one revolution (360 °) the rolls perform a full cycle of oscillatory movements.

In a roll assembly, the oscillatory movements of the rolls do not have dynamic components. With oscillatory movements, the mechanical connections on the contact of the rolls and the strip are broken, and the frictional forces and energy-power parameters are reduced. Due to the effect of transverse in antiphase (across the width of the strip) friction forces in the strip, transverse tensile stresses are created, which themselves affect the stress state of the metal, reducing the lateral prop pressure O2. Moreover, the presence of slip across the strip contributes to smoothing roll microrelief and reduce the irregularity of wear on their surfaces. Smoothing a microrelief (reducing the height of asperities) makes it possible to obtain strips with a lower roughness, which is very important when applying zinc, tin, etc. coatings on its surface.

As a result of development, the diameters of the rolls are reduced, their surface deteriorates and this requires regrinding on new ones.

(smaller) diameters. In accordance with the design of the mills and the thickness of the hardened layer of steel rolls, the total amount of diameter reduction after regrinding is 6-10% of the diameter. Thus, for a cold rolling mill, the depth of the quenched roll layer with a diameter of 500 mm is 30 mm per diameter, i.e. 6%. At the same time, the side (inclined) surfaces of the rolls also wear out at the places of their contact. After wear of the inclined surfaces of the rolls, the magnitude of the axial displacement of the rolls is reduced by the amount generated by the development of axial clearances. If a

the contact points of the rolls in the axial direction, in the course of operation, produce a production of 2 mm, and their horizontal displacement decreases by 2 mm. The gap increases if, when regrinding the diameters of the rolls,

updated side surfaces of the rolls. When the diameter of the upper roll decreases during the regrinding process, it is possible to simultaneously remove the worn area of the end surfaces, if the regrind size

corresponds to the height of the worn-out ca on the face inclined surface. If the wear height is greater than the regrinding depth, then it is necessary to grind the inclined end surfaces of the upper roll as clean. In this case, a new size will be obtained, several (by 0.5-1.0 mm) smaller than the original LB.

Lower roll peretachivayut (grind), i.e. reduce the diameters of D and DK

to remove a worn layer. After these diameters decrease, as follows from the drawing, the axial distance between the points of the inclined inner surfaces decreases, which allows to restore

LH size or slightly reduce it.

The position of the rolls after regrinding does not change, but changes in accordance with the set forth dimensions D, DK, De and U.

The operability check of the proposed roller unit is performed on a two-roll mill with a roll diameter of D 100 mm and a collar diameter of 116 mm. Rolled strip of aluminum with a thickness of H 1.4 mm and a width of 160 mm (barrel length 270 mm)

with compression Ah 0.28 mm. Emulsol T is used as a lubricant; the circumferential speed of the rolls of 60 rpm provides n 60 oscillations per minute.

Claims (1)

Invention Formula A roller unit comprising two rolls, one of which is made with end thrust collars cooperating with inclined end surfaces of the second roll, characterized in that 516960206 in order to reduce the consumption of the rolls, the bells are made with an angle of inclination, preserve the length of the working part of the roll with an equal angle of inclination of the end surface-flanges for regrinding, the internal angles of the second roll,