CN103949476A - Method for fast predicting grinding quantity of support roller of hot rolled plate strip rolling mill - Google Patents

Abstract

The invention relates to a method for fast predicting the grinding quantity of a support roller of a hot rolled plate strip rolling mill, belongs to the technical field of a rolling roller maintenance process and is used for predicating the grinding quantity of the support roller during the roller maintenance by a calculation formula. The method has the technical scheme that a support roller grinding quantity predicating formula is adopted, the constants and the coefficients corresponding to a rolling roller material and a machine frame of the support roller to be ground are substituted into the support roller grinding quantity predicating formula, and the required grinding quantity of the support roller can be obtained. The method can overcome the defects of the grinding method adopted during the support roller maintenance in the prior art, the effect of fast and accurately predicting the reasonable grinding quantity of the support roller to be maintained is realized, the goals of high speed, accuracy and high efficiency in the maintenance process are achieved, after the method is adopted, the consumption quantity of the support roller is obviously changed and is averagely reduced by about 0.03 kg/t. The method has the advantages that the problem of restricting difficulty of the support roller maintenance is solved, the production of the rolling mill is ensured, the maintenance time and the cost are also greatly reduced, and the production cost is reduced.

Description

A kind of rolling mill for hot rolled planks and strips backing roll stock removal method for quick predicting

Technical field

A kind of determine backing roll stock removal while the present invention relates to roll maintenance in rolling mill for hot rolled planks and strips method, belongs to roll service procedure technical field.

Background technology

The four-high mill of rolling mill for hot rolled planks and strips is comprised of upper and lower two working rolls and backing roll.Each backing roll all needs grinding after being on active service, and its free-revving engine is to remove the work hardening layer that roll surface produces due to the long-term contact of rolling, but backing roll want actually grinding how much not only safely but also economy be the problem that technical staff pays close attention to always.At present, backing roll method for grinding is roughly divided into following two kinds: the one, and hardness measurement method.The method is that the qualified hardness while entering factory with reference to roll product is contrasted measurement, after being the certain unit of each backing roll grinding in grinding process millimeter (1 millimeter or 0.5 millimeter), roll surface is carried out to hardness measurement, until its recovery or be less than 3HSD(Shore hardness) entering can be qualified after factory's hardness; The 2nd, experience filing.Machine roll surface situation under roll work range estimation backing roll, provides an estimation stock removal according to backing roll use experience in the past, or the in addition auxiliary confirmation such as eddy current, ultrasonic wave, and the method does not generally change with reference to roll hardness.For above two kinds of methods, experience filing needs standby long-term abundant work on the spot experience and the Non-Destructive Testing technical ability of roll instrument, and comparatively abstract difficult grasp.Though hardness measurement method is compared with the former science, directly perceived more, but operation is numerous and diverse, make backing roll need constantly repeat for the 24 hours operation of " grinding 1 millimeter → stop 1 millimeter of exceed standard → dosage of grinding → hardness detection → hardness grinding " when grinding, until hardness is qualified, circulating in when every backing roll is processed so usually needs to carry out 4,5 times more than, during grinding, surpass 12 hours, very easily affect milling train and normally produce.In addition, the backing roll hardness criterion of acceptability of in the past following " after backing roll mill roll surface hardness will approach or not higher than in the hardness 3HSD of Qi Ru factory ", for some, in material, producer, there is certain difference to cause the more obvious backing roll of work hardening phenomenon, this standard is too conservative, makes roll cause unnecessary waste.

Except above-mentioned two kinds of methods, there is no up to now better to determine the method for backing roll stock removal, make backing roll grinding become the hard nut to crack of restriction backing roll maintenance, be not resolved for a long time, not only greatly affected milling train production, increase maintenance time and expense yet, improved production cost, therefore be necessary to develop a kind of backing roll stock removal fast prediction method, fast and effeciently backing roll is carried out to grinding, guarantee carrying out smoothly of production.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of rolling mill for hot rolled planks and strips backing roll stock removal method for quick predicting, the shortcoming that the method for grinding that this Forecasting Methodology adopts in the time of can overcoming current maintenance support roller exists, realize prediction quickly and accurately and treat the reasonable stock removal of maintenance support roller, reach maintenance process fast, object accurately and efficiently.

The technical scheme solving the problems of the technologies described above is:

A rolling mill for hot rolled planks and strips backing roll stock removal method for quick predicting, it adopts following steps to carry out:

(1) calculate backing roll stock removal and adopt following formula:

M=C+K1 * roller diameter+K2 * rolling tonnage+K3 * rolling milimeter number

In formula:

The stock removal of M---backing roll, unit: millimeter;

C---constant;

K1, K2, K3---coefficient;

Roller diameter unit: millimeter; Rolling tonnage unit: ten thousand tons; Rolling milimeter number unit: km;

(2) for the backing roll of different frames, unlike material, constant C and COEFFICIENT K 1, K2, K3 select different numerical value;

(3) frame of the backing roll of the lower machine of being on active service and the corresponding constant C of roll material and COEFFICIENT K 1, K2, K3 substitution are calculated in the formula of backing roll stock removal, can be drawn the stock removal that this backing roll is required.

Above-mentioned rolling mill for hot rolled planks and strips backing roll stock removal method for quick predicting, the constant C of the backing roll of different frames, unlike material and COEFFICIENT K 1, K2, K3 are following numerical value:

(1) finishing stand, cast steel backing roll: C=0.0969, K1=-0.000288, K2=0.0905, K3=0.000623;

(2) finishing stand, forged steel backup roll: C=0.202, K1=-0.000401, K2=0.0784, K3=0.000551;

(3) pony roughing mill, cast steel backing roll: C=-0.352, K1=0, K2=0.0308, K3=0.00251;

(4) pony roughing mill, forged steel backup roll: C=-0.497, K1=0, K2=0.0266, K3=0.00257.

The invention has the beneficial effects as follows:

The present invention adopts backing roll stock removal predictor formula, by the formula of the frame of backing roll to be ground and the corresponding constant of roll material and coefficient substitution calculating backing roll stock removal, can draw the stock removal that this backing roll is required.The shortcoming that the method for grinding that the present invention adopts in the time of can overcoming current maintenance support roller exists, realize prediction quickly and accurately and treat the reasonable stock removal of maintenance support roller, reach maintenance process fast, object accurately and efficiently, adopt after the method, under identical rolling condition, backing roll consumption has had obvious variation, before improving decreased average about 0.03kg/t.The hard nut to crack that the invention solves the maintenance of restriction backing roll, has not only guaranteed milling train production, also greatly reduces maintenance time and expense, has reduced production cost.

The specific embodiment

The present invention is a kind of rolling mill for hot rolled planks and strips backing roll stock removal method for quick predicting, and it adopts stock removal computing formula to carry out.This formula is by the data of the aspects such as a large amount of backing roll uses of collection in worksite, grinding, Non-Destructive Testing detection, according to the change condition of work hardening layer, set up finite element equation, solve linear equations, finally draw the key factor and the linear equation that affect backing roll stock removal (being roll surface work hardening layer) size.

Calculate backing roll stock removal and adopt following formula:

M=C+K1 * roller diameter+K2 * rolling tonnage+K3 * rolling milimeter number

In formula: M---the stock removal of backing roll, unit: millimeter; C---constant; K1, K2, K3---coefficient;

Roller diameter unit: millimeter; Rolling tonnage unit: ten thousand tons; Rolling milimeter number unit: km;

For the backing roll of different frames, unlike material, constant C and COEFFICIENT K 1, K2, K3 select different numerical value, and the constant C of the backing roll of different frames, unlike material and COEFFICIENT K 1, K2, K3 are following numerical value:

(1) finishing stand, cast steel backing roll: C=0.0969, K1=-0.000288, K2=0.0905, K3=0.000623;

(2) finishing stand, forged steel backup roll: C=0.202, K1=-0.000401, K2=0.0784, K3=0.000551;

(3) pony roughing mill, cast steel backing roll: C=-0.352, K1=0, K2=0.0308, K3=0.00251;

(4) pony roughing mill, forged steel backup roll: C=-0.497, K1=0, K2=0.0266, K3=0.00257;

The frame of the backing roll of the lower machine of being on active service and the corresponding constant C of roll material and COEFFICIENT K 1, K2, K3 substitution are calculated in the formula of backing roll stock removal, can be drawn the stock removal that this backing roll is required.

One embodiment of the present of invention are as follows:

2401# backing roll is in normally lower machine one day, and frame is finish rolling, and material is forged steel, and roller diameter is 1536 millimeters, and amount of rolling is 32.635 ten thousand tons, and milimeter number is 1068 kms.

Use backing roll stock removal fast prediction method, by the corresponding constant C of 2401# backing roll and COEFFICIENT K 1, K2, K3 substitution stock removal predictor formula, both:

Stock removal=0.202-0.000401 * 1536+0.0784 * 32.635+0.000551 * 1068

2.7 millimeters of ≈

Notice grinding machine work, 2401# stock removal is 2.7 millimeters, can descend machine to detect without stopping bed after mill.

The Contrast on effect of the present embodiment and conventional method:

One, implementation process contrast

If 1 adopts traditional roll surface hardness detection method, 1 millimeter of every grinding, need stop a hardness and detect; After 3 millimeters of grindings, roll hardness, higher than entering the hardness 5HSD of factory left and right, needs 1 millimeter of dosage grinding; After 4 millimeters of roll dressings, stop bed and measure, now roll surface hardness, higher than entering the hardness 3HSD of factory left and right, reaches lower machine standard, can second roll of grinding.

Known, in 2401# grinding process, stop altogether bed and detect 4 times, hardness detection is defective restarts grinding machine roll 3 times, and hardness detects 4 times, and stock removal amounts to approximately 4 millimeters, when machine grinding, is about 8 hours.

If 2 use backing roll stock removal fast prediction methods,, after 2.7 millimeters of 2401# grindings, inscribe machine, when machine grinding, be about 4 hours.

Two, roll consumption contrast

Adopt after the method, under identical rolling condition, backing roll consumption has had obvious variation, before improving decreased average about 0.03kg/t.

In sum, the object of grinding as required after the present invention utilizes backing roll stock removal fast prediction technology to realize that backing roll is each to be on active service, there is the remarkable advantages such as safe and reliable, flexible, simple to operate, for the grinding of rolling mill for hot rolled planks and strips backing roll provides a kind of comparatively unique technology.

Claims (2)

1. a rolling mill for hot rolled planks and strips backing roll stock removal method for quick predicting, is characterized in that: its adopts following steps to carry out:

(1) calculate backing roll stock removal and adopt following formula:

M=C+K1 * roller diameter+K2 * rolling tonnage+K3 * rolling milimeter number

In formula:

The stock removal of M---backing roll, unit: millimeter;

C---constant;

K1, K2, K3---coefficient;

Roller diameter unit: millimeter; Rolling tonnage unit: ten thousand tons; Rolling milimeter number unit: km;

(2) for the backing roll of different frames, unlike material, constant C and COEFFICIENT K 1, K2, K3 select different numerical value;

(3) frame of the backing roll of the lower machine of being on active service and the corresponding constant C of roll material and COEFFICIENT K 1, K2, K3 substitution are calculated in the formula of backing roll stock removal, can be drawn the stock removal that this backing roll is required.

2. rolling mill for hot rolled planks and strips backing roll stock removal method for quick predicting according to claim 1, is characterized in that: the constant C of the backing roll of different frames, unlike material and COEFFICIENT K 1, K2, K3 are following numerical value:

(1) finishing stand, cast steel backing roll: C=0.0969, K1=-0.000288, K2=0.0905, K3=0.000623;

(2) finishing stand, forged steel backup roll: C=0.202, K1=-0.000401, K2=0.0784, K3=0.000551;

(3) pony roughing mill, cast steel backing roll: C=-0.352, K1=0, K2=0.0308, K3=0.00251;

(4) pony roughing mill, forged steel backup roll: C=-0.497, K1=0, K2=0.0266, K3=0.00257.