CN114472552A - Method for measuring axial clearance of multi-roller mill roller system - Google Patents
Method for measuring axial clearance of multi-roller mill roller system Download PDFInfo
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- CN114472552A CN114472552A CN202210280275.XA CN202210280275A CN114472552A CN 114472552 A CN114472552 A CN 114472552A CN 202210280275 A CN202210280275 A CN 202210280275A CN 114472552 A CN114472552 A CN 114472552A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
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Abstract
The invention relates to the technical field of rolling mills, in particular to a method for measuring axial gaps of a multi-roller rolling mill roll system. The application provides a method for measuring axial clearance of a multi-roller mill roller system, which is used for the initial machine installation of the roller system or after rolling, and comprises the following steps: s1: driving the roller system to rotate, so that each roller to be measured moves towards the transmission side from the working side until the axial clearance of the roller to be measured on the transmission side is completely eliminated; s2: and stopping the rotation of the roller system, and measuring the axial clearance of each roller to be measured on the working side, namely the axial clearance of each roller to be measured, so that the accurate axial clearance value can be obtained by measuring the axial clearance of the roller to be measured on the working side, and the maintenance operation can be effectively guided and the abrasion or the fault of a related mechanical mechanism can be predicted.
Description
Technical Field
The invention relates to the technical field of rolling mills, in particular to a method for measuring axial gaps of a multi-roller rolling mill roll system.
Background
In the process of rolling the steel strip, in order to prevent accidents from happening and find hidden dangers in time, the axial clearance of a roll system needs to be measured and controlled within a proper range, but an accurate axial clearance value cannot be obtained in the current measuring mode, so that the axial clearance cannot be effectively controlled, and further, the prediction and production guidance values of faults are not high.
Disclosure of Invention
The application provides a method for measuring the axial clearance of a multi-roll mill roll system, which solves the technical problem that the axial clearance cannot be effectively controlled in the prior art.
The application provides a method for measuring the axial clearance of a multi-roller mill roller system, which is used for the initial machine installation or the rolling of the roller system and comprises the following steps:
s1: driving the roller system to rotate, so that each roller to be measured moves towards the transmission side from the working side until the axial clearance of the roller to be measured on the transmission side is completely eliminated;
s2: and stopping the rotation of the roller system, and measuring the axial clearance of each roller to be measured on the working side, namely the axial clearance of each roller to be measured.
In some embodiments, further comprising:
s3: repeating the steps S1 and S2 for P times, and if the measured variation value of the axial clearance of each roller to be measured in the P times of measurement is less than or equal to the value X, selecting the maximum axial clearance value in the P times of measurement as the final axial clearance value; if the measured variation range of the axial clearance of each roll to be measured is larger than the value X, the steps S1 and S2 are repeated for Y times, until the measured variation range of the axial clearance of each roll to be measured is smaller than or equal to the value X, the largest axial clearance value in the Y times of measurement is selected as the final axial clearance value, wherein X is larger than 0, P, Y is an integer, P is larger than 1, and Y is larger than 1.
In some embodiments, step S1 includes:
s11: driving the roller system to rotate so that the roller which is not to be measured moves from the working side to the transmission side;
s12: the non-to-be-measured roller drives the to-be-measured roller to move from the working side to the transmission side until the axial clearance of the to-be-measured roller on the transmission side is completely eliminated.
In some embodiments, the step S11 further includes:
and setting rotation parameters of the roller system, and driving the roller system to rotate according to the rotation parameters, so that the non-to-be-measured roller can drive the non-to-be-measured roller to drive the to-be-measured roller to move from the working side to the transmission side in the shifting process.
In some embodiments, the rotational parameters include: rolling force, emulsion flow rate and rotation speed.
In some embodiments, the rolling force is 200-600 tons, the emulsion flow rate is 2000-10000L/min, and the rotation speed is 120-800 mpm.
In some embodiments, in step S12:
when the non-to-be-measured roller moves by 100-200mm from the working side to the transmission side, the axial clearance of the to-be-measured roller on the transmission side is completely eliminated.
In some embodiments, in step S2, the axial gap of each roll to be measured on the working side is measured by pressing a lead wire against the roll.
In some embodiments, X has a value of 0.5 to 1 mm.
In some embodiments, the P, Y have a value of 3 for each.
The beneficial effect of this application is as follows:
according to the method for measuring the axial clearance of the multi-roller mill roller system, each roller to be measured moves towards the transmission side by the working side through the rotation of the driving roller system until the axial clearance of the roller to be measured on the transmission side is completely eliminated, at the moment, the axial clearance of the roller to be measured on the working side is the whole axial clearance of the roller to be measured, and therefore the accurate axial clearance value can be obtained by measuring the axial clearance of the roller to be measured on the working side, and therefore maintenance operation can be effectively guided and abrasion or faults of relevant mechanical mechanisms can be predicted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a schematic structural diagram of a Sendzimir rolling mill provided in this embodiment before adjustment of the rolling system;
fig. 2 is a schematic structural diagram of the sendzimir mill after adjusting the roll system provided in this embodiment.
Description of reference numerals:
100-memorial archway, 110-memorial archway front door, 120-memorial archway rear door, 200-supporting roller, 210-two middle driven rollers, 220-two middle driving rollers, 230-one middle roller, 240-working roller, 300-thrust bearing, 310-thrust block, 320-traversing oil cylinder and 330-transmission system mechanical part.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The cold rolling process of the high magnetic induction oriented silicon steel is generally produced by a single-frame sendzimir twenty-high reversing mill, and in order to obtain proper structure performance, an aging rolling mode is adopted, namely: the temperature of the steel strip is gradually increased to the target temperature of 200-230 ℃ in the first three times through the working roll 240 with high pressure, small flow and high roughness, the temperature of the steel strip is gradually reduced to 60-70 ℃ in the fourth time through large flow of emulsion, and the steel strip is rolled to a finished product at normal temperature in the subsequent time.
Fig. 1 is a schematic structural diagram of a sendzimir mill roller system before adjustment according to this embodiment, and referring to fig. 1, the sendzimir mill roller system has an up-down symmetrical structure, and the upper half is described as an example, the sendzimir mill roller system includes a housing 100, a supporting roller 200, two intermediate driven rollers 210, two intermediate driving rollers 220, an intermediate roller 230, and a working roller 240, which are sequentially disposed, two sides of the roller system are respectively a driving side and a working side, the driving side is provided with a housing front door 110, the working side is provided with a housing rear door 120, and the sendzimir mill roller system is an existing device, and the detailed structure thereof is not repeated herein. The present embodiment is illustrated with a twenty-high sendzimir mill roll train, which includes eight support rolls 200, two intermediate two driven rolls 210, four intermediate two drive rolls 220, four intermediate one rolls 230, and two work rolls 240.
Because the high magnetic induction oriented silicon steel is rolled by adopting a high reduction rate and temperature control mode, the working condition of a roller system in a rolling mill housing is severe, and the load of a transmission system is large, which mainly shows two points, namely, the roller thermal expansion is large due to the temperature control rolling mode, the roller is in alternating temperature change, and the roller body in the axial direction stretches frequently; secondly, the cold rolling mode with large pass reduction (about 40 percent) has large transmission load and frequent slip accidents, and aggravates the abrasion of mechanical parts of a transmission system. Both conditions lead to changes and even abnormalities of the axial clearance of the rolling mill roller system.
Furthermore, the inner axial positioning mode of the Sendzimir rolling mill roll system mainly comprises the following modes, firstly, locking positioning is carried out, for example, eight supporting rolls 200 can ensure that the axial positions of the supporting rolls 200 are fixed through locking plates and limiting blocks, and enough gaps are left between the end faces of the working sides of the supporting rolls 200 and the memorial archway front door 110 to counteract the influence of the thermal expansion of mechanical parts; secondly, positioning the oil cylinders, namely axially shifting according to the process requirements, for example, four one middle rollers 230, and respectively driving two four one middle rollers 230 to axially shift in groups through two transverse oil cylinders 320 on the transmission side; third, limiting and positioning, for example, two middle driven rollers 210, two middle transmission rollers 220 and two working rollers 240 are provided, thrust bearings 300 are provided on two sides of the two middle driven rollers 210 and the two working rollers 240 to limit axial play of the two middle driven rollers 210, thrust blocks 310 are provided on the front door 110 and the rear door 120 of the housing, and a certain axial gap is usually left between the thrust bearings 300 and the thrust blocks 310 to counteract the influence of thermal expansion; one end of the four two-middle transmission rollers 220 close to the transmission side is provided with a gear box (not shown) and a transmission system mechanical part 330, one end close to the working side is provided with a thrust bearing 300, and the memorial archway rear door 120 is correspondingly provided with a thrust block 310, namely the axial movement of the transmission system mechanical part 330 and the four two-middle transmission rollers 220 is limited by the gear box and the thrust bearing 300.
Therefore, axial gaps exist in the transmission system mechanical part 330, between the transmission system mechanical part 330 and the two intermediate transmission rollers 220, between the two intermediate driven rollers 210, the two intermediate transmission rollers 220 and the two working rollers 240 and the corresponding thrust bearings 300, and between the two intermediate driven rollers 210, the two intermediate transmission rollers 220, the thrust bearings 300 of the two working rollers 240 and the corresponding thrust blocks 310, and the like, and the axial gap value cannot be accurately measured in the prior art.
Based on this, the embodiment of the present application provides a method for measuring an axial gap of a multi-roll mill roll system, which is used for the initial operation or after rolling of the roll system, and includes:
s1: the driving roller system rotates, so that each roller to be measured moves towards the transmission side from the working side until the axial clearance of the roller to be measured on the transmission side is completely eliminated;
s2: and stopping the rotation of the roller system, and measuring the axial clearance of each roller to be measured on the working side, namely the axial clearance of each roller to be measured.
It should be noted that, the excessive axial clearance between the two middle driving rollers 220 may cause the engaging surface of the mechanical part 330 of the transmission system to be dislocated, further aggravate the tooth surface abrasion and accelerate the transmission failure, affect the transmission of the driving torque, cause the slip probability to increase, and cause the fault shutdown in serious cases; the axial clearance of the two intermediate driving rollers 220 is too small, and in addition, the influence factors of the thermal expansion of the rollers can generate abnormal axial force to damage the thrust bearing 300 of the rollers and the thrust bearing of the gear box, so that abnormal accidents are caused, and the stable operation of the rolling mill is influenced.
Further, the excessive axial clearance between the two middle driven rolls 210 and the working roll 240 can affect the strip shape control and stable operation of the rolling mill; the axial clearance between the two intermediate driven rolls 210 and the working roll 240 is too small, and in addition, the influence factor of the thermal expansion of the rolls can generate abnormal axial force to damage the roll thrust bearing 300, so that abnormal accidents are caused, and the stable operation of the rolling mill is influenced.
Therefore, the axial clearances of the two intermediate driven rolls 210, the two intermediate driving rolls 220 and the working roll 240 need to be strictly controlled, and the accurate value of the axial clearance needs to be measured, while the intermediate roll 230 is positioned by the oil cylinder, and has the function of active play without measuring the value of the axial clearance, so that in the embodiment, the two intermediate driven rolls 210, the two intermediate driving rolls 220 and the working roll 240 are rolls to be measured, and the intermediate roll 230 is a roll which is not to be measured.
It is worth mentioning that the technical scheme of the application is applicable to all multi-roll mill roll systems, such as twelve-roll mills and thirty-roll mills, and is not limited to twenty-roll sendzimir mill roll systems.
Generally, the axial clearance of each roll to be measured on the working side can be measured by pressing with a wire.
Of course, after the axial clearance value is measured, the measured axial clearance value needs to be compared with the axial clearance value in the normal range, and then adjustment is performed. When the measured value of the axial clearance is larger than the normal range, firstly, the axial related components are checked, and the key points are whether the mechanical components such as the plum blossom catcher, the tooth catcher, the thrust bearing 300, the thrust block 310 and the like bearing the axial force are abnormally worn or normally worn to a certain degree, whether the sizes of the components are correct or not, the abnormal components are replaced, the clearance value is ensured to return to normal, if no obvious reason is found temporarily, a gasket is added at the thrust block 310 at the front door 110 of the memorial archway, and the clearance value is ensured to be in the normal range.
Similarly, when the measured value of the axial clearance is smaller than the normal range, the axial related components are checked firstly, the key point is whether the sizes of the mechanical components such as the quincuncial adaptor, the toothed adaptor, the thrust bearing 300 and the thrust block 310 bearing the axial force are correct, abnormal jamming exists, the abnormal components are replaced, the clearance value is ensured to return to normal, and if no obvious reason is found temporarily, the gasket is reduced at the thrust block 310 of the front door 110 of the memorial archway, and the clearance value is ensured to be in the normal range.
Fig. 2 is a schematic structural diagram of the adjusted sendzimir mill roll system provided in this embodiment, and referring to fig. 1 and fig. 2, the method for measuring the axial gap of the roll system of the multi-roll mill provided in this embodiment of the present application eliminates the axial gap of the roll to be measured on the transmission side, and at this time, the axial gap of the roll to be measured on the working side is the total axial gap of the roll to be measured. Therefore, the accurate axial clearance value can be obtained by measuring the axial clearance of the roller to be measured on the working side, so that the maintenance operation can be effectively guided and the abrasion or the fault of the related mechanical mechanism can be effectively predicted.
Because the axial clearance of the roller to be measured on the transmission side cannot be completely eliminated at one time, in order to ensure the accuracy of the measured data, the method of the embodiment further comprises the following steps:
s3: repeating the steps S1 and S2 for P times, and if the measured variation value of the axial clearance of each roller to be measured in the P times of measurement is less than or equal to the value X, selecting the maximum axial clearance value in the P times of measurement as the final axial clearance value; if the measured variation range of the axial clearance of each roll to be measured is larger than the value X, the steps S1 and S2 are repeated for Y times continuously until the measured variation range of the axial clearance of each roll to be measured is smaller than or equal to the value X, and the largest axial clearance value in the Y times of measurement is selected as the final axial clearance value, wherein X is larger than 0, P, Y is an integer, P is larger than 1, and Y is larger than 1.
Repeating the measuring step for P times, wherein if the change value of the axial clearance measured each time is smaller, namely smaller than or equal to the value X, the axial clearance of the roller to be measured on the transmission side is almost completely eliminated, at the moment, the axial clearance of the roller to be measured on the working side is the total axial clearance, and for the sake of safety, the maximum value of the measured data is selected as the final axial clearance value to be compared with the normal range value; on the contrary, if the variation value of the axial clearance measured each time is large, it indicates that the axial clearance of the roll to be measured on the transmission side is not completely eliminated, and then the step Y is repeated continuously until the variation value of the axial clearance of each roll to be measured is measured to be less than or equal to the value X, and at this time, the maximum axial clearance value in the Y measurements is selected as the final axial clearance value.
Specifically, X may have a value of 0.5 to 1mm, and P, Y may have a value of 3.
Further, step S1 includes:
s11: the driving roller system rotates to enable the non-to-be-measured roller to move from the working side to the transmission side;
s12: the non-to-be-measured roller drives the to-be-measured roller to move from the working side to the transmission side until the axial clearance of the to-be-measured roller on the transmission side is completely eliminated.
As can be seen from the foregoing, an intermediate roller 230 has a function of active play, and when the driving roller system rotates, an intermediate roller 230 actively moves from the working side to the driving side. That is, when one intermediate roller 230 moves from the working side to the driving side, the two intermediate driving rollers 220, the two intermediate driven rollers 210 and the working roller 240 adjacent to the intermediate roller 230 can be driven to move to the driving side by the friction force between the roller systems, so as to generate an axial force to the driving side, further eliminate the axial gap of the driving side, and completely reserve the gap on the working side.
Further, step S11 includes:
and setting rotation parameters of the roller system, and driving the roller system to rotate according to the rotation parameters, so that the non-to-be-measured roller can drive the non-to-be-measured roller to drive the to-be-measured roller to move from the working side to the transmission side in the shifting process.
Specifically, the rotation parameters include: rolling force, emulsion flow rate and rotation speed. More specifically, the rolling force can be 200-600 tons, the flow rate of the emulsion can be 2000-10000L/min, and the rotation speed can be 120-800 mpm. That is, by setting the above parameters, it can be ensured that one intermediate roller 230 can drive two intermediate driving rollers 220, two intermediate driven rollers 210 and working roller 240 adjacent thereto to move together in the moving process, thereby eliminating the axial gap of the driving side.
Further, in step S12:
when the non-to-be-measured roller moves by 100-200mm from the working side to the transmission side, the axial clearance of the to-be-measured roller on the transmission side is completely eliminated.
To facilitate understanding of the technical solutions of the embodiments of the present application, the following examples are given:
the Sendzimir twenty roller of a certain steel mill mainly produces low-temperature oriented silicon steel, five passes of rolling are performed, the first three passes are aging temperature rise rolling, the temperature range of the strip steel is normal temperature-250 ℃, the temperature of the fourth pass is reduced, the temperature of the fifth pass is normal temperature rolling, the temperature range is 60-80 ℃, so the working condition is normal temperature-250 ℃, and the measurement of the axial clearance in a cold state after the fifth pass of rolling is taken as an example for the time:
(1) presetting the rolling force of 400 tons and the flow rate of emulsion of 6000L/min, and after the rolling force and the flow rate of the emulsion are set in place, starting to drive a roller system to rotate clockwise at the rotation speed of 200 mpm;
(2) when the roller system rotates, an intermediate roller 230 moves from the working side to the transmission side, the transverse moving distance is 200mm, after the transverse moving position of the intermediate roller 230 is in place, the roller system stops rotating and emulsion injection stops, the roller system is opened to press down, and the released rolling force is 0;
(3) the axial clearance values of the four two middle transmission rollers 220 measured by a lead wire pressing method are respectively 5.33mm, 5.13mm, 5.12mm and 5.55 mm; the axial gap values of the two middle driven rollers 210 are respectively 5.32mm and 5.30 mm; the axial clearance value of the two working rolls 240 is 4.32 mm;
(4) repeating the steps (1) and (2), wherein the axial clearance values of the second four middle transmission rollers 220 in the cold state are respectively 5.31mm, 5.11mm, 5.12mm and 5.50 mm; the axial gap values of the two middle driven rollers 210 are respectively 5.34mm and 5.35 mm; the axial clearance value of the two working rolls 240 is 4.28 mm;
(5) repeating the steps (1) and (2), wherein the axial clearance values of the fourth two middle transmission rollers 220 in the cold state are respectively 5.31mm, 5.11mm, 5.12mm and 5.50 mm; the axial gap values of the two middle driven rollers 210 are 5.42mm and 5.40mm respectively; the axial clearance value of the two working rolls 240 is 4.28 mm; the first three measured values in the cold state have small change, and the change values are all smaller than 0.5mm, so the third measured value is selected in the cold state.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for measuring the axial clearance of a multi-roller mill roller system is used for the roller system to be initially arranged on a machine or be rolled, and is characterized by comprising the following steps:
s1: driving the roller system to rotate, so that each roller to be measured moves towards the transmission side from the working side until the axial clearance of the roller to be measured on the transmission side is completely eliminated;
s2: and stopping the rotation of the roller system, and measuring the axial clearance of each roller to be measured on the working side, namely the axial clearance of each roller to be measured.
2. The method of measuring the axial gap of a cluster mill roll train of claim 1, further comprising:
s3: repeating the steps S1 and S2 for P times, and if the measured variation value of the axial clearance of each roller to be measured in the P times of measurement is less than or equal to the value X, selecting the maximum axial clearance value in the P times of measurement as the final axial clearance value; if the measured variation range of the axial clearance of each roll to be measured is larger than the value X, the steps S1 and S2 are repeated for Y times, until the measured variation range of the axial clearance of each roll to be measured is smaller than or equal to the value X, the largest axial clearance value in the Y times of measurement is selected as the final axial clearance value, wherein X is larger than 0, P, Y is an integer, P is larger than 1, and Y is larger than 1.
3. The method for measuring the axial gap of a roll train of a multi-roll mill as claimed in claim 1, wherein the step S1 comprises:
s11: driving the roller system to rotate so that the roller which is not to be measured moves from the working side to the transmission side;
s12: the non-to-be-measured roller drives the to-be-measured roller to move from the working side to the transmission side until the axial clearance of the to-be-measured roller on the transmission side is completely eliminated.
4. The method for measuring the axial gap of a multi-roll mill roll train according to claim 3, wherein the step S11 further comprises:
and setting rotation parameters of the roller system, and driving the roller system to rotate according to the rotation parameters, so that the non-to-be-measured roller can drive the non-to-be-measured roller to drive the to-be-measured roller to move from the working side to the transmission side in the shifting process.
5. The method of measuring the axial gap of a cluster of multi-roll mill rolls of claim 4, wherein the rotational parameters include: rolling force, emulsion flow rate and rotation speed.
6. The method as claimed in claim 5, wherein the rolling force is 200-600 tons, the flow rate of the emulsion is 2000-10000L/min, and the rotation speed is 120-800 mpm.
7. The method for measuring the axial gap of a cluster roll of a multi-roll mill as claimed in claim 6, wherein in step S12:
when the non-to-be-measured roller moves by 100-200mm from the working side to the transmission side, the axial clearance of the to-be-measured roller on the transmission side is completely eliminated.
8. The method for measuring the axial gap of a roll system of a cluster mill as claimed in claim 1, wherein in step S2, the axial gap of each roll to be measured on the working side is measured by pressing a wire against the roll.
9. The method of claim 2, wherein X has a value of 0.5 to 1 mm.
10. The method of claim 2, wherein said P, Y values are each 3.
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2022
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| CN107442569A (en) * | 2017-07-21 | 2017-12-08 | 中冶南方工程技术有限公司 | A kind of eighteen-high mill for rolling metal strip |
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