CN-122007147-A - Vertical roller pairing method for steel rail universal rolling mill

CN122007147ACN 122007147 ACN122007147 ACN 122007147ACN-122007147-A

Abstract

The invention relates to a pairing method for vertical rolls of a steel rail universal rolling mill, and belongs to the technical field of profile steel rolling processes in the metallurgical industry. The technical proposal is as follows: determining the rolling reduction of the head vertical roll and the rolling reduction of the bottom vertical roll according to the specification and the steel grade of the steel rail; determining an initial roller diameter according to the relation of the reduction quantity; deriving the length of a deformation zone based on a chord length formula of a circle, namely the chord length corresponding to the arc length of a contact zone between the vertical roll and the steel rail; according to deformation of two sides of the vertical roll the principle of consistent zone length is that, reversely deducing the radius of the paired vertical rolls by combining the Pythagorean theorem; from the calculation Or And selecting a vertical roller with corresponding specification. The invention has the advantages that the offset phenomenon generated when the tail part of the steel rail is separated from the universal hole type in the rolling process of the universal rolling mill can be eliminated, the phenomenon that the tail part of the steel rail in the previous pass is used as the head part to bite into the hole type of the next rolling mill to strike the roller in the reciprocating rolling process of the steel rail is avoided, the surface of the roller is damaged, the stability in the rolling process of the steel rail is improved, and the quality and the precision of the steel rail are improved.

Inventors

ZHANG WEIGE
CHEN LIKE
ZHANG YICHUN
HAN ZHIJIE
LI XIN
GUAN XUDONG
YANG JIE
DUAN SHENGYI

Assignees

邯郸钢铁集团有限责任公司
河钢股份有限公司邯郸分公司

Dates

Publication Date: 20260512
Application Date: 20260107

Claims (4)

1. A method for pairing vertical rolls of a steel rail universal rolling mill is characterized by comprising the following steps: step one, determining the rolling reduction Determining the rolling reduction delta of the head vertical roll according to the specification and the steel grade of the steel rail Bottom vertical roll reduction delta ; Step two, selecting an initial roller diameter Determining initial roller diameter according to the relation of the reduction, and determining delta ≤Δ With the head vertical roll as an initial roll diameter R When delta >Δ The bottom vertical roll is taken as an initial roll diameter R ; Step three, calculating the length of the deformation zone Deriving the length of a deformation zone based on a chord length formula of a circle, namely the chord length corresponding to the arc length of a contact zone between a vertical roll and a steel rail, when delta ≤Δ Length L of deformation zone on head vertical roll side = Delta, when delta >Δ Length L of deformation zone at bottom vertical roll side = ; Step four, pairing the radius of the vertical rolls According to deformation of two sides of the vertical roll the principle of consistent zone length is that, i.e. L =L Reverse deriving the radius of paired vertical rolls by combining Pythagorean theorem ≤Δ At the time, the radius R of the bottom vertical roll =( )/( ) This formula is obtained by adding L =L Substituting the length formula of the deformation zone of the bottom vertical roll, and finishing to obtain the length delta >Δ At the time, the radius R of the head vertical roll =( )/( ); Step five, vertical roll assembly From the calculated R Or R is And selecting a vertical roller with corresponding specification, and installing the vertical roller in a vertical roller box.
2. The method for pairing universal vertical rolls of steel rail according to claim 1, wherein the first step is characterized in that the steel rail is 60kg/m in specification and the rolling reduction delta of the head vertical rolls is achieved The rolling reduction delta of the bottom vertical roll is 4mm-8mm 3Mm-6mm.
3. The method for pairing universal vertical rolls of steel rail according to claim 1, wherein the first step is characterized in that the steel rail is 50kg/m in specification and the rolling reduction delta of the head vertical rolls is achieved The rolling reduction delta of the bottom vertical roll is 3mm-7mm Is 2mm-5mm.
4. The method for pairing universal vertical rolls of steel rail according to claim 1, wherein the first step is characterized in that the steel rail is 75kg/m in specification and the rolling reduction delta of the head vertical rolls is achieved The rolling reduction delta of the bottom vertical roll is 5mm-9mm 4Mm-7mm.

Description

Vertical roller pairing method for steel rail universal rolling mill Technical Field The invention relates to a pairing method for vertical rolls of a steel rail universal rolling mill, and belongs to the technical field of steel rolling process adjustment in the metallurgical industry. Background In the process of rolling steel rail by a universal rolling mill, the universal rolling mill pass consists of two horizontal rollers and two vertical rollers, and the pass of the four rollers jointly form the universal steel rail pass, wherein the upper horizontal roller and the lower horizontal roller are required to ensure that the roller diameters are consistent and the pass profile is symmetrical so as to avoid the defects of head warping or head buckling during steel rail rolling. The two vertical rolls are respectively a head vertical roll and a bottom vertical roll according to rolling positions, the head vertical roll is required to roll rail heads of the rail heads, the roller body is provided with arc grooves due to complex contours such as two sides of the rail heads, the actual effective range of the working roller diameter is reduced by 10% -15% compared with the nominal roller diameter, the bottom vertical roll is required to roll rail bottoms of the rail only, and the deviation of the working roller diameter and the nominal roller diameter is less than or equal to 0.5mm by adopting a planar roller body design. Because the original roller diameters of the vertical rollers at two sides are the same, the working roller diameter of the vertical roller with the groove is generally inconsistent with the roller diameter of the plane vertical roller, meanwhile, because the respective rolling reduction of the two vertical rollers is different, the lengths of the metal deformation areas are different, the phenomenon of left and right bends of the steel rail when the steel rail passes out of the universal hole type can be caused, and the phenomenon of impacting the roller can be caused when the steel rail enters the hole type of the next rolling mill. When the phenomenon that the steel rail elbow impacts the roller is serious, the surface of the roller is knocked, surface defects are finally formed on the surface of the steel rail, so that the steel rail is judged to be wasted and degraded, and the continuous production of a production line and the quality stability of products are affected. At present, the industry mainly adopts a trial-and-error method to adjust the pairing of the vertical rolls, namely, trial rolling is carried out by replacing the vertical rolls with different roll diameters, and the vertical rolls are repeatedly adjusted according to the condition of the steel rail elbow, so that the method cannot meet the production requirements of multiple varieties and fast rhythm. In addition, some enterprises also try to compensate the deformation difference of the vertical rolls by adjusting the reduction of the horizontal rolls, but the cross section size of the steel rail is out of tolerance. Therefore, a method for pairing vertical rolls based on accurate calculation is needed, and the problem of inconsistent length of a deformation zone is fundamentally solved. Disclosure of Invention The invention aims to provide a pairing method for vertical rolls of a steel rail universal rolling mill, which eliminates the head deflection phenomenon generated when the tail part of the steel rail is separated from a universal hole type in the rolling process of the steel rail universal rolling mill, avoids the collision of the tail part of the steel rail in the previous pass as the head part to the roll when the tail part of the steel rail is used as the head part to bite into the hole type of the next rolling mill in the reciprocating rolling process of the steel rail, causes the surface of the roll to be knocked and hurt, and solves the problems in the background art. The technical scheme of the invention is as follows: A pairing method of vertical rolls of a steel rail universal rolling mill is operated according to the following steps: step one, determining the rolling reduction Determining the rolling reduction delta of the head vertical roll according to the specification and the steel grade of the steel railBottom vertical roll reduction delta; Step two, selecting an initial roller diameter Determining initial roller diameter according to the relation of the reduction, and determining delta≤ΔWith the head vertical roll as an initial roll diameter RWhen delta>ΔThe bottom vertical roll is taken as an initial roll diameter R; Step three, calculating the length of the deformation zone Deriving the length of a deformation zone based on a chord length formula of a circle, namely the chord length corresponding to the arc length of a contact zone between a vertical roll and a steel rail, when delta≤ΔLength L of deformation zone on head vertical roll side=Delta, when delta>ΔLength L of deformation zone at bottom