CN-117299816-B - Design method for thickness of working layer of hot rolling and finish rolling supporting roller

CN117299816BCN 117299816 BCN117299816 BCN 117299816BCN-117299816-B

Abstract

The invention relates to a design method of the thickness of a working layer of a hot rolling finish rolling supporting roller, which comprises the steps of calculating a steel rolling allowable condition, calculating a roller changing allowable condition, calculating the maximum increment of a working roller, judging whether the supporting roller can be increased or not, calculating the increment of the working layer of the supporting roller and the like. According to the design method for the thickness of the working layer of the hot rolling finish rolling supporting roller, the diameter of the maximum working roller of the hot continuous rolling mill can be increased from d2 to d3, the effective working layer of the supporting roller is increased, and the consumption of the rolling roller of the rolling mill can be reduced by more than 10%.

Inventors

LI XINBO
XU CUIHUA
WANG JIE
ZHANG XIAOYANG
ZHONG YEKANG
JIANG JUYAN

Assignees

上海梅山钢铁股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220623

Claims (2)

1. The design method of the thickness of the working layer of the hot rolling finish rolling supporting roller is characterized by comprising the following steps: (1) Defining the diameter of a supporting roller of the hot continuous rolling mill F i -F j as D, the designed maximum diameter of the supporting roller as D2, the designed minimum diameter of the supporting roller as D1, the diameter of a working roller of the hot continuous rolling mill F i -F j as D, the designed maximum diameter of the working roller as D2, the designed minimum diameter of the working roller as D1 and the maximum realizable diameter of the working roller as D3; (2) The maximum value of the steel rolling allowable condition is D2/2+d2, the minimum value is D1/2+d1, and the variation range is (D2-D1)/2+ (D2-D1) when the steel rolling allowable condition is that the diameter of the working roll is half of the diameter of the supporting roll, namely D/2+d; (3) The roll changing allowance condition is half of the diameter of the working roll plus half of the diameter of the supporting roll, namely D/2+d/2, the maximum value of the roll changing allowance condition is D2/2+d2/2, the minimum value is D1/2+d1/2, and the variation range is (D2-D1)/2+ (D2-D1)/2; (4) If the effective working layer of the working roller is increased by x, x is required to be satisfied that x/(x+d2-D1) is less than or equal to (D2-3 x-D1)/(D2-D1), and the maximum value of x is obtained; (5) Calculating the ratio k of the diameter increment of the maximum achievable diameter of the working roll to x, wherein k= (d 3-d 2)/x, if k is less than 0.7, the diameter of the support roll can be increased; (6) If the effective working layer of the supporting roller is increased by y, y needs to satisfy: (D3-D2)/(D3-D1)/(d2+y-D1) less than or equal to (D2-3 (D3-D2) -D1), and (y/(D2-D1+y))≤(d2-y/2-d1)/(d3-d1); A calculated maximum value of y; (7) The diameter of the support roller increases by a=m×y, wherein m is an effective coefficient and takes a value of 0.3 to 0.9.
2. The method for designing a working layer thickness of a finish rolling backup roll according to claim 1, further comprising the step (8) of confirming that the roll mill has the ability to produce a backup roll effective working layer of (D2-D1+a) after the step (7), otherwise, adjusting down to the ability range.

Description

Design method for thickness of working layer of hot rolling and finish rolling supporting roller Technical Field The invention relates to a design method for the thickness of a working layer of a hot rolling finish rolling supporting roller, and belongs to the technical field of metal rolling equipment. Background In order to reduce the roller consumption, the effective working layer of the roller of the newly-built hot continuous rolling machine is obviously improved, for example, the effective working layer of the working roller at the front section of finish rolling reaches 100mm, the effective working layer of the working roller at the rear section reaches 90mm, and the effective working layer of the supporting roller reaches 150mm. In pursuit of extreme, reduced roll costs, the effective diameter of the work rolls can be increased by means of the rolling mill window space. Through window size calculation, the increase of the working roll diameter rolling mill is large, and the degree of the increase of an effective working layer of the working roll is limited because the roll manufacturing level cannot be met or the swing angle of a main shaft of the rolling mill cannot be met, so that difficulty is brought to further reducing the roll consumption. Disclosure of Invention The invention aims to solve the technical problems and overcome the defects of the technology and provides a method for designing the thickness of the working layer of the supporting roller on the premise of meeting the maximum working layer of the working roller. In order to solve the technical problems, the technical scheme provided by the invention is that the design method of the thickness of the working layer of the hot rolling finish rolling supporting roller comprises the following steps: (1) Defining the diameter of a supporting roller of the hot continuous rolling mill F i-Fj as D, the designed maximum diameter of the supporting roller as D2, the designed minimum diameter of the supporting roller as D1, the diameter of a working roller of the hot continuous rolling mill F i-Fj as D, the designed maximum diameter of the working roller as D2, the designed minimum diameter of the working roller as D1 and the maximum realizable diameter of the working roller as D3; (2) The maximum value of the steel rolling allowable condition is D2/2+d2, the minimum value is D1/2+d1, and the variation range is (D2-D1)/2+ (D2-D1) when the steel rolling allowable condition is that the diameter of the working roll is half of the diameter of the supporting roll, namely D/2+d; (3) The roll changing allowance condition is half of the diameter of the working roll plus half of the effective diameter of the supporting roll, namely D/2+d/2, the maximum value of the roll changing allowance condition is D2/2+d2/2, the minimum value is D1/2+d1/2, and the variation range is (D2-D1)/2+ (D2-D1)/2; (4) If the effective working layer of the working roller is increased by x, x is required to be satisfied that x/(x+d2-D1) is less than or equal to (D2-3 x-D1)/(D2-D1), and the maximum value of x is obtained; (5) Calculating the ratio k of the diameter increment of the maximum achievable diameter of the working roll to x, wherein k= (d 3-d 2)/x, if k is less than 0.7, the diameter of the support roll can be increased; (6) If the effective working layer of the supporting roller is increased by y, y needs to satisfy: (D3-D2)/(D3-D1)/(d2+y-D1) less than or equal to (D2-3 (D3-D2) -D1), and (y/(D2-D1+y))≤(d2-y/2-d1)/(d3-d1); A calculated maximum value of y; (7) The increase of the supporting roller diameter is a=m×y, wherein m is an effective coefficient and takes a value of 0.3 to 0.9. The scheme is further improved in that after the step (7), the method further comprises the step (8) of confirming that the mill has the capacity of producing the effective working layer as (D2-D1+a), and otherwise, the mill is adjusted down to the capacity range. According to the design method for the thickness of the working layer of the hot rolling finish rolling supporting roller, the diameter of the maximum working roller of the hot continuous rolling mill can be increased from d2 to d3, the effective working layer of the supporting roller is increased, and the consumption of the rolling roller of the rolling mill can be reduced by more than 10%. Detailed Description Examples The design method of the thickness of the working layer of the hot rolling finish rolling supporting roller is applied to a hot continuous rolling finishing mill. The hot continuous rolling finishing mill is a general four-high mill and comprises an upper working roll, a lower working roll and a supporting roll, wherein the diameter ranges of the working roll and the supporting roll at least need to meet two conditions, namely a rolling condition and a roll changing condition. The rolling condition is that the height requirement of a rolling line needs to be met, and the roll changing condition needs to meet the r