CN116727445A - High-strength steel multi-roller tension leveler and roller number determining method thereof - Google Patents

High-strength steel multi-roller tension leveler and roller number determining method thereof Download PDF

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Publication number
CN116727445A
CN116727445A CN202310815885.XA CN202310815885A CN116727445A CN 116727445 A CN116727445 A CN 116727445A CN 202310815885 A CN202310815885 A CN 202310815885A CN 116727445 A CN116727445 A CN 116727445A
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roller
straightening
residual stress
stress value
roll
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郑祥臣
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
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    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Straightening Metal Sheet-Like Bodies (AREA)

Abstract

The application discloses a high-strength steel multi-roller tension leveler and a roller number determining method thereof. The high-strength steel multi-roller tension leveler comprises a fixed roller box, a tension leveler roller box and a multi-roller box, wherein an upper tension leveler roller and a supporting roller are supported in the tension leveler roller box, an upper straightening roller and a supporting roller are supported in the multi-roller box, a lower tension leveler roller, a lower straightening roller and a supporting roller are supported in the fixed roller box, the lower tension leveler roller is arranged below the upper tension leveler roller and corresponds to the upper tension leveler roller, the lower straightening roller is arranged below the upper straightening roller and corresponds to the upper straightening roller, and the upper tension leveler roller at the tail part of the tension leveler roller and the upper straightening roller at the head part of the multi-roller box share a supporting roller. The high-strength steel multi-roller straightening machine provided by the application adopts the upper straightening roller at the tail part of the straightening roller box and the upper straightening roller at the head part of the multi-roller box to share the supporting roller, so that the roller spacing is convenient to adjust, the reduction calculation process is convenient to simplify, and the straightening effect of the high-strength steel is further ensured.

Description

High-strength steel multi-roller tension leveler and roller number determining method thereof
Technical Field
The application relates to the technical field of steel rolling equipment, in particular to a high-strength steel multi-roller withdrawal and straightening machine and a roller number determining method thereof.
Background
In the straightening in the metallurgical industry at present, in order to improve the plate shape of high-strength steel, a mode of a withdrawal and straightening machine and a multi-roller straightening machine is generally adopted, the withdrawal and straightening machine mainly has the functions of enabling strip steel to generate elongation percentage, the multi-roller straightening mainly has the functions of reducing the residual stress of the strip steel and flattening the strip steel.
The strength of the high-strength steel, especially the quenched high-strength steel, is very high, and compared with the common strip, the yield strength of the high-strength steel is higher, and cracks are more likely to occur during straightening. Moreover, the existing withdrawal and straightening machine and the existing multi-roller straightening machine are adopted, and the rolling reduction of the withdrawal and straightening rollers is difficult to accurately determine, for example, the situation that the strip steel is cracked due to the fact that the rolling reduction of the first withdrawal and straightening roller is too large. In actual production, the reduction of the withdrawal and straightening rollers is a very difficult process, so that the straightening effect of the high-strength steel is not ideal.
Disclosure of Invention
The application mainly aims to provide a high-strength steel multi-roller tension leveler, which aims to facilitate adjustment of the same roller spacing so as to simplify the reduction calculation process.
In order to achieve the above purpose, the application provides a high-strength steel multi-roller tension leveler, which comprises a fixed roller box, a tension leveler roller box and a multi-roller box, wherein,
the upper straightening roller and the supporting roller are supported in the straightening roller box, the upper straightening roller and the supporting roller are supported in the multi-roller box, the lower straightening roller and the supporting roller are supported in the fixed roller box, the lower straightening roller is positioned below the upper straightening roller and is correspondingly arranged below the upper straightening roller, and the upper straightening roller at the tail part of the straightening roller box and the upper straightening roller at the head part of the multi-roller box share a supporting roller.
Preferably, the total number of the upper tension leveler roller and the lower tension leveler roller is at least three.
Preferably, all the upper withdrawal and straightening rollers of the withdrawal and straightening roller box uniformly control the rolling reduction by adopting an inlet rolling mechanism.
The application further provides a roller number determining method based on the high-strength steel multi-roller tension leveler, which comprises the following steps:
selecting proper average tension of the strip steel according to the size information and the mechanical property information of the strip steel, and calculating to obtain the reverse bending rate ratio C of the upper tension leveler roller w1 ；
Selecting proper average tension of the strip steel according to the mechanical property information of the strip steel to be corrected and the size information of the strip steel to be corrected, and calculating to obtain the total roll number n of the upper tension leveler roll and the lower tension leveler roll 1 ；
According to the reverse bending ratio C of the upper tension leveler w1 And the reverse bending ratio C of the upper straightening roll w2 The total number n of the upper straightening roller and the lower straightening roller is calculated 2 。
Preferably, the ratio C of the reverse bending rate of the upper tension leveler is calculated according to the positive correlation between the reduction of the upper tension leveler and the reverse bending rate of the upper tension leveler w1 And determining the reduction of the upper tension leveler.
Preferably, the reverse bending ratio of the upper tension leveler is C w1 The following formula was used for calculation:
wherein F is the average tension of the strip steel, B is the width of the strip steel, H is the thickness of the strip steel and sigma s Is the yield strength epsilon of the strip steel b For the strain of the strip steel under the limit condition of tensile strength epsilon s The strain of the strip steel is realized under the elastic limit condition.
Preferably, the total number of rolls n of the upper tension leveler roll and the lower tension leveler roll 1 The following formula is used for calculation:
wherein ε p E is the elastic modulus of the strip steel, and the average tension F of the strip steel is 0.1BH sigma s To 0.3BH sigma s Between them.
Preferably, the total number of upper and lower straightening rolls n 2 The method comprises the following steps:
determining the size information of the upper straightening roller, the mechanical property information of the strip steel to be corrected and the target residual stress value sigma p ；
Determining the maximum surface residual stress value sigma of the strip steel to be corrected according to the size information of the upper straightening roller and the mechanical property information of the strip steel to be corrected 1 And a maximum internal residual stress value sigma 2 Is calculated according to the formula;
according to the maximum surface residual stress value sigma 1 And a maximum internal residual stress value sigma 2 Are all smaller than the target residual stress value sigma p Determining the total number of upper and lower straightening rollers, n 2 。
Preferably, the maximum surface residual stress value sigma 1 The following formula is used for calculation:
wherein n is 2 The number of the upper straightening rollers is C w2 Is the reverse bending rate ratio of the upper straightening roller;
the maximum internal residual stress value sigma 2 The following formula is used for calculation:
preferably, the said method is based on the maximum surface residual stress value sigma 1 And a maximum internal residual stress value sigma 2 Are all smaller than the target residual stress value sigma p Determining the total number of upper and lower straightening rollers, n 2 The method specifically comprises the following steps:
initial determination of the reverse bend Rate ratio C of the upper straightening roll w2 ；
By determining the rate of reverse bending C w2 Calculating to obtain the maximum internal residual stress value sigma 2 ；
Judging the maximum internal residual stress value sigma 2 Whether or not it is smaller than the target residual stress value sigma p ；
When the maximum internal residual stress value sigma 2 Greater than or equal to the target residual stress value sigma p When the initial determination of the reverse bending rate ratio C of the upper straightening roll is performed w2 In the step (C) of correcting the positive-negative bending ratio C w2 ；
When the maximum internal residual stress value sigma 2 Less than the target residual stress value sigma p When the bending rate ratio C is determined w2 Substituting the maximum surface residual stress value sigma 1 According to the maximum surface residual stress value sigma in the calculation formula of (2) 1 Less than the target residual stress value sigma p Calculating the total number of upper and lower straightening rollers n 2 。
The high-strength steel multi-roller withdrawal and straightening machine provided by the application is required to obtain the reverse bending ratio of the roller when the rolling reduction of the withdrawal and straightening roller box is determined. The reverse bending ratio of the roller is related to a plurality of factors (including roll spacing and rolling reduction), and the upper straightening roll at the tail part of the straightening roll box and the upper straightening roll at the head part of the multi-roll box share a supporting roll, so that the roll spacing of the straightening roll box and the multi-roll box is convenient to adjust to be equal, the calculation process of the reverse bending ratio of the roller is simplified, and at the moment, the reverse bending ratio of the roller is only positively related to the rolling reduction, thereby accurately determining the rolling reduction of the high-strength steel multi-roll straightening machine and further ensuring the straightening effect of the high-strength steel. In addition, the upper straightening roller at the tail part of the straightening roller box and the upper straightening roller at the head part of the multi-roller box share a supporting roller, that is, the straightening roller and the multi-roller are in an integrated structure, so that on one hand, the manufacturing cost of equipment can be saved, on the other hand, the reverse bending continuity is ensured, and the residual stress in the strip steel can be better reduced. In addition, when the number of the tension leveler and the number of the multi-roller levelers are designed, the reverse bending ratio of the roller also needs to be obtained, and the structure is adopted, so that the reasonable design of the number of the tension leveler and the number of the multi-roller levelers is facilitated.
Drawings
FIG. 1 is a schematic view of a construction of a preferred embodiment of a high strength steel multi-roll withdrawal and straightening machine of the present application;
FIG. 2 is a schematic diagram of a flow for determining an upper straightening roller in the roller number determining method of the high-strength steel multi-roller straightening machine;
FIG. 3 is a schematic diagram of a refinement flow of step S3 shown in FIG. 2;
FIG. 4 is a schematic diagram of a process for determining the upper tension leveler roller in the roller number determining method of the high-strength steel multi-roller tension leveler.
In the figure, a 1-fixed roller box, a 2-tension leveler roller box, a 3-multi-roller box, a 4-upper tension leveler roller, a 5-upper straightening roller, a 6-lower tension leveler roller, a 7-lower straightening roller, an 8-inlet pressing mechanism, a 9-outlet pressing mechanism, a 10-inlet tension system and an 11-outlet tension system.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The application provides a high-strength steel multi-roller withdrawal and straightening machine.
Referring to fig. 1, in the preferred embodiment, a high-strength steel multi-roll withdrawal and straightening machine includes a fixed roll cassette 1, a withdrawal and straightening roll cassette 2, and a multi-roll cassette 3, wherein,
an upper withdrawal straightening roll 4 (R in the figure) is supported in the withdrawal straightening roll box 2 b And R is d ) And a back-up roll, in which an upper straightening roll 5 (R in the figure) is supported in a multi-roll box 3 1 、R 3 、R 5 ……R 11 ) And a back-up roller, in which a lower tension leveler 6 (R in the figure) is supported in the fixed roller box 1 a 、R c And R is e ) Lower straightening roll 7 (R in the figure) 2 、R 4 、R 6 ……R 12 ) And a supporting roller, the lower straightening roller 6 is arranged below the upper straightening roller 4 and is correspondingly arranged below the upper straightening roller 5, the lower straightening roller 7 is arranged correspondingly below the upper straightening roller 5, and the upper straightening roller 4 at the tail part of the straightening roller box 2 and the upper straightening roller 5 at the head part of the multi-roller box 3 share a supporting roller (R) 1 And R is d Sharing a support roller).
The lower tension leveler 6 is disposed opposite to the upper tension leveler 4 to generate elongation of the strip, and the lower leveler 7 is disposed opposite to the upper leveler 5 to reduce residual stress of the strip and level the strip.
In this embodiment, all the upper tension leveler rolls 4 of the tension leveler roll cassette 2 are uniformly controlled in rolling reduction by the inlet rolling mechanism 8.
Further, the total number of the upper tension leveler roller 4 and the lower tension leveler roller 6 is at least three, and in this embodiment, the total number of the upper tension leveler roller 4 and the lower tension leveler roller 6 is 5 as an example. Because the whole rolling scheme is adopted in the embodiment, the whole rolling reduction is smaller than the rolling reduction of the last rolling reduction of single rolling reduction (the first roller in the prior art can ensure the elongation only by the large rolling reduction, and the elongation is jointly ensured by a plurality of small rolling reduction), and at the moment, the elongation of the strip steel is realized by a plurality of rollers, so that the quantity of the rollers is at least 5, and the better elongation of the strip steel can be ensured.
The multi-roller box 3 adopts an outlet pressing mechanism 9 to control the pressing amount. The multi-roll cassette 3 is in an inclined state, i.e. the reduction (inlet to outlet direction) of the straightening rolls in the multi-roll cassette is in a decreasing state.
The pull straightening roller box 2 can change the rolling reduction of the pull straightening roller by the inlet rolling mechanism 8, the multi-roller box 3 can adjust the rolling reduction by the outlet rolling mechanism 9, the general rolling reduction of the inlet is large, the pull straightening roller box 2 needs large rolling reduction to generate elongation, the general rolling reduction of the outlet rolling mechanism 9 is small, and the multi-roller R is caused 1 To R 11 The reduction of (2) decreases.
The elongation can be provided only by adopting a large reduction of the tension leveler roll box 2, and the strip steel can have internal stress under large bending. The rolling reduction of all the upper straightening rollers 4 is uniformly controlled by adopting an inlet rolling mechanism 8, and the rolling reduction of all the upper straightening rollers 5 is uniformly controlled by adopting an outlet rolling mechanism 9, so that the rolling reduction of the upper straightening rollers 5 is gradually reduced in the direction from the inlet to the outlet, and the homogenization of the residual stress in the strip steel is realized.
In the present embodiment, the inlet depressing mechanism 8 and the outlet depressing mechanism 9 employ a servo hydraulic cylinder or an electric depressing system.
Further, the high-strength steel multi-roller tension leveler also comprises an inlet tension system 10 positioned at the head of the tension leveler roller box 2.
Further, the high-strength steel multi-roller tension leveler also comprises an outlet tension system 11 positioned at the tail of the multi-roller box 3. The exit tension system 10 and the entrance tension system 11 typically employ tension rollers to provide tension.
The outlet tension system and the inlet tension system provide tension for the strip steel, the larger the reduction of the tension leveler roll box 2 is, the larger the elongation is, the larger the tension of the outlet tension system is, the larger the elongation is, the inlet tension system is passive tension, the value obtained by subtracting the tension loss from the outlet tension system is, the larger the reduction of the tension leveler roll box 2 is, the larger the tension loss is, and the smaller the tension of the inlet tension system is.
If the plate shape of the raw material strip steel is very good, the elongation is not required to be generated, only the residual stress of the strip steel is required to be reduced, the tension of the outlet tension system can enable the strip steel to run forwards, the inlet tension system can be close to 0, or the tension of the strip steel in normal running can be met, and the requirements of the strip steel in normal running, such as the requirement of strip steel deflection, stable unit speed tension and the like, are met.
In this embodiment, the fixed roll cassette 1 is fixed to the base, that is, the installation position of the fixed roll cassette 1 is fixed and cannot be moved up and down, and the tension leveler roll cassette 2 and the multiple roll cassette 3 are both movable up and down to adjust the amount of depression.
The high-strength steel multi-roll withdrawal and straightening machine proposed in this embodiment is required to obtain the reverse bending ratio of the rolls when determining the reduction of the withdrawal and straightening roll cassette 2. The reverse bending ratio of the roller is related to a plurality of factors (including roll spacing and rolling reduction), and the upper straightening roll 4 at the tail part of the straightening roll box 2 and the upper straightening roll 5 at the head part of the multi-roll box 3 share a supporting roll, so that the roll spacing of the straightening roll box 2 and the multi-roll box 3 is convenient to adjust to be equal, the calculation process of the reverse bending ratio of the roller is simplified, and at the moment, the reverse bending ratio of the roller is only positively related to the rolling reduction, so that the rolling reduction of the high-strength steel multi-roll straightening machine can be accurately determined, and the straightening effect of the high-strength steel is further ensured. In addition, the upper straightening roller 4 at the tail part of the straightening roller box 2 and the upper straightening roller 5 at the head part of the multi-roller box 3 share a supporting roller, that is, the straightening roller and the multi-roller straightening adopt an integrated structure, so that on one hand, the manufacturing cost of equipment (the manufacturing cost of equipment of a straightening machine and the multi-roller straightening belongs to two pieces of equipment in the prior art is high), on the other hand, the reverse bending continuity is ensured, and the residual stress in strip steel can be better reduced. In addition, when the number of the tension leveler and the number of the multi-roller levelers are designed, the reverse bending ratio of the roller also needs to be obtained, and the structure is adopted, so that the reasonable design of the number of the tension leveler and the number of the multi-roller levelers is facilitated.
The application provides a method for determining the number of rollers of a high-strength steel multi-roller withdrawal and straightening machine.
In the preferred embodiment, referring to fig. 1, a method for determining the number of rollers of a high-strength steel multi-roller withdrawal and straightening machine includes the following steps:
step S1, according to the strip steelThe dimension information and the mechanical property information are selected to obtain the reverse bending ratio C of the upper tension leveler roller by calculating by selecting proper average tension of strip steel w1 ；
S2, selecting proper average tension of the strip steel according to the mechanical property information of the strip steel to be corrected and the size information of the strip steel to be corrected, and calculating to obtain the total roll number n of the upper tension leveler roll and the lower tension leveler roll 1 ；
Step S3, according to the reverse bending rate ratio C of the upper tension leveler w1 And the reverse bending ratio C of the upper straightening roll w2 The total number n of the upper straightening roller and the lower straightening roller is calculated 2 。
In step S1, according to the positive correlation between the reduction of the upper tension leveler and the reverse bending ratio of the upper tension leveler, the calculated reverse bending ratio C of the upper tension leveler w1 And determining the reduction of the upper tension leveler.
Reverse bending ratio C of upper and lower withdrawal rolls w1 The following formula was used for calculation:
wherein F is the average tension of the strip steel, B is the width of the strip steel, H is the thickness of the strip steel and sigma s Is the yield strength epsilon of the strip steel b For the strain of the strip steel under the limit condition of tensile strength epsilon s The strain of the strip steel is realized under the elastic limit condition.
After the reverse bending ratio of the upper tension leveler is determined by the formula (1), the rolling reduction of the upper tension leveler is adjusted according to the reverse bending ratio of the upper tension leveler, so that the straightening quality of the high-strength strip steel is ensured. Because the determination of the rolling reduction of the upper straightening roller in the prior art is a very troublesome process, in the application, the upper straightening roller at the tail part of the straightening roller box and the upper straightening roller at the head part of the multi-roller box share one supporting roller, so that the adjustment of the roller spacing of the straightening roller box and the multi-roller box is convenient, the calculation process of the reverse bending ratio of the roller is simplified, and at the moment, the reverse bending ratio of the roller is only positively related to the rolling reduction, thereby accurately determining the rolling reduction of the high-strength steel multi-roller straightening machine and further ensuring the straightening effect of the high-strength steel.
In step S2, the total number of rollers n of the upper tension leveler roller and the lower tension leveler roller 1 The following formula is used for calculation:
wherein ε p E is the elastic modulus of the strip steel, and the average tension F of the strip steel is 0.1BH sigma s To 0.3BH sigma s Between them.
By adopting the formula (2), the number n of the upper tension leveler roller can be calculated 1 。
In the step S3, the upper straightening roller at the tail part of the straightening roller box and the upper straightening roller at the head part of the multi-roller box share one supporting roller, so that the reverse bending rate ratio C of the upper straightening roller is ensured w1 And the reverse bending ratio C of the upper straightening roll w2 Is equal, thus simplifying the determination of the reverse bending ratio C of the upper straightening roll w2 Thereby also facilitating the calculation of the total roll number n of the upper straightening roll plus the lower straightening roll 2 。
Specifically, referring to fig. 3, in step S3, the total number of upper and lower straightening rollers n 2 The method comprises the following steps:
step S31, determining the size information of the upper straightening roller, the mechanical property information of the strip steel to be corrected and a target residual stress value sigma p (target residual stress value sigma) p The stress value expected to be reached after the upper straightening roller straightens;
step S32, determining the maximum surface residual stress value sigma of the strip steel to be corrected according to the size information of the upper straightening roller and the mechanical property information of the strip steel to be corrected 1 And a maximum internal residual stress value sigma 2 Is calculated according to the formula;
step S33, according to the maximum surface residual stress value sigma 1 And a maximum internal residual stress value sigma 2 Are all smaller than the target residual stress value sigma p Determining the total number of upper and lower straightening rollers, n 2 。
In S32, the maximum surface residual stress value sigma 1 The following formula is used for calculation:
wherein n is 2 The number of the upper straightening rollers is C w2 Is the reverse bending rate ratio of the upper straightening roller;
maximum internal residual stress value sigma 2 The following formula is used for calculation:
referring to fig. 4, the step S33 specifically includes:
step S331 of initially determining the reverse bend ratio C of the upper straightening roll w2 ；
Step S332, by determining the reverse bending ratio C w2 Calculating to obtain the maximum internal residual stress value sigma 2 ；
Step S333, determining the maximum internal residual stress value sigma 2 Whether or not it is smaller than the target residual stress value sigma p ；
When the maximum internal residual stress value sigma 2 Greater than or equal to the target residual stress value sigma p If so, go back to step S331 to correct the positive/negative bending ratio C w2 The method comprises the steps of carrying out a first treatment on the surface of the When the maximum internal residual stress value sigma 2 Less than the target residual stress value sigma p Step S334 is executed;
step S334, determining the inverse bending ratio C w2 Substituting the maximum surface residual stress value sigma 1 In the calculation formula (formula 4) according to the maximum surface residual stress value sigma 1 Less than the target residual stress value sigma p Calculating the total number of upper and lower straightening rollers n 2 。
Requiring design of sigma 1 Sum sigma 2 As close to sigma as possible p . Thus minimizing C w2 And n 2 The smaller the two, the smaller the manufacturing cost of the withdrawal and straightening machine.
The roller number determining method of the high-strength steel multi-roller straightening and withdrawal machine provided by the application can reasonably determine the roller numbers of the upper straightening roller and the upper straightening roller, thereby effectively reducing the residual stress of the straightened material. In addition, the number of the rollers determined by the design method can maximally reduce the cost of equipment under the condition of meeting the straightening condition.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but is intended to cover all equivalent structures modifications, direct or indirect application in other related arts, which are included in the scope of the present application.

Claims (10)

1. A high-strength steel multi-roller tension leveler is characterized by comprising a fixed roller box, a tension leveler roller box and a multi-roller box, wherein,
the upper straightening roller and the supporting roller are supported in the straightening roller box, the upper straightening roller and the supporting roller are supported in the multi-roller box, the lower straightening roller and the supporting roller are supported in the fixed roller box, the lower straightening roller is positioned below the upper straightening roller and is correspondingly arranged below the upper straightening roller, and the upper straightening roller at the tail part of the straightening roller box and the upper straightening roller at the head part of the multi-roller box share a supporting roller.
2. The high-strength steel multi-roller tension leveler according to claim 1, wherein the total number of the upper tension leveler roller and the lower tension leveler roller is at least three.
3. The high-strength steel multi-roll withdrawal and straightening machine according to claim 1 or 2, wherein all upper withdrawal and straightening rolls of the withdrawal and straightening roll cassette are uniformly controlled in rolling reduction by an inlet rolling mechanism.
4. A method for determining the number of rolls of the high-strength steel multi-roll withdrawal and straightening machine according to claims 1 to 3, characterized by comprising the steps of:
selecting proper average tension of the strip steel according to the size information and the mechanical property information of the strip steel, and calculating to obtain the reverse bending rate ratio C of the upper tension leveler roller w1 ；
Selecting proper average tension of the strip steel according to the mechanical property information of the strip steel to be corrected and the size information of the strip steel to be corrected, and calculating to obtain the total roll number n of the upper tension leveler roll and the lower tension leveler roll 1 ；
According to the reverse bending ratio C of the upper tension leveler w1 And the reverse bending ratio C of the upper straightening roll w2 The total number n of the upper straightening roller and the lower straightening roller is calculated 2 。
5. The method for determining the number of rolls of a high-strength steel multi-roll withdrawal apparatus according to claim 4, wherein the ratio C of the reverse bending ratios of the upper withdrawal and straightening rolls is calculated based on the positive correlation between the reduction of the upper withdrawal and the ratio C of the reverse bending ratios of the upper withdrawal and straightening rolls w1 And determining the reduction of the upper tension leveler.
6. The method for determining the number of rolls of a high-strength steel multi-roll withdrawal and straightening machine according to claim 4, wherein the reverse bending ratio of the upper and lower withdrawal and straightening rolls is C w1 The following formula was used for calculation:
wherein F is the average tension of the strip steel, B is the width of the strip steel, H is the thickness of the strip steel and sigma s Is the yield strength epsilon of the strip steel b For the strain of the strip steel under the limit condition of tensile strength epsilon s The strain of the strip steel is realized under the elastic limit condition.
7. The method for determining the number of rolls of a high-strength steel multi-roll withdrawal and straightening machine according to claim 6, wherein the total number of rolls n of the upper withdrawal and lower withdrawal straightening rolls 1 The following formula is used for calculation:
wherein ε p E is the elastic modulus of the strip steel, and the average tension F of the strip steel is 0.1BH sigma s To 0.3BH sigma s Between them.
8. The method for determining the number of rolls of a high-strength steel multi-roll leveler according to claim 6, wherein the total number of rolls n of the upper leveling roll and the lower leveling roll 2 The method comprises the following steps:
determining the size information of the upper straightening roller, the mechanical property information of the strip steel to be corrected and the target residual stress value sigma p ；
Determining the maximum surface residual stress value sigma of the strip steel to be corrected according to the size information of the upper straightening roller and the mechanical property information of the strip steel to be corrected 1 And a maximum internal residual stress value sigma 2 Is calculated according to the formula;
according to the maximum surface residual stress value sigma 1 And a maximum internal residual stress value sigma 2 Are all smaller than the target residual stress value sigma p Determining the total number of upper and lower straightening rollers, n 2 。
9. The method for determining the number of rolls of a high-strength steel multi-roll withdrawal and straightening machine according to claim 8, wherein the maximum surface residual stress value σ 1 The following formula is used for calculation:
wherein n is 2 The number of the upper straightening rollers is C w2 Is the reverse bending rate ratio of the upper straightening roller;
the maximum internal residual stress value sigma 2 The following formula is used for calculation:
10. the method for determining the number of rolls of a high-strength steel multi-roll withdrawal and straightening machine according to claim 9, characterized in that,
said reference to the maximum surface residual stress value sigma 1 And a maximum internal residual stress value sigma 2 Are all smaller than the target residual stress value sigma p Determining the total number of upper and lower straightening rollers, n 2 The method specifically comprises the following steps:
initial determination of the reverse bend Rate ratio C of the upper straightening roll w2 ；
By determining the rate of reverse bending C w2 Calculating to obtain the maximum internal residual stress value sigma 2 ；
Judging the maximum internal residual stress value sigma 2 Whether or not it is smaller than the target residual stress value sigma p ；
When the maximum internal residual stress value sigma 2 Greater than or equal to the target residual stress value sigma p When the initial determination of the reverse bending rate ratio C of the upper straightening roll is performed w2 In the step (C) of correcting the positive-negative bending ratio C w2 ；
When the maximum internal residual stress value sigma 2 Less than the target residual stress value sigma p When the bending rate ratio C is determined w2 Substituting the maximum surface residual stress value sigma 1 According to the maximum surface residual stress value sigma in the calculation formula of (2) 1 Less than the target residual stress value sigma p Calculating the total number of upper and lower straightening rollers n 2 。
CN202310815885.XA 2023-07-04 2023-07-04 High-strength steel multi-roller tension leveler and roller number determining method thereof Pending CN116727445A (en)

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