High-strength steel multi-roll straightening machine and method for determining the number of rollers
By adopting an integrated structure and formula calculation in the high-strength steel multi-roll tension leveler, the determination of the number of rolls and the amount of reduction is simplified, solving the problem of the difficulty in accurately determining the amount of reduction during the straightening process of high-strength steel, and achieving efficient straightening effect and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WISDRI ENG & RES INC LTD
- Filing Date
- 2023-07-04
- Publication Date
- 2026-06-02
AI Technical Summary
In the existing technology for straightening high-strength steel, it is difficult to accurately determine the reduction amount of the tension leveler and the multi-roller leveler, resulting in unsatisfactory straightening effect of high-strength steel, easy cracking, and high equipment cost.
A high-strength steel multi-roll tension leveler is designed. By sharing a support roller between the upper tension leveling roller at the tail of the tension leveling roller box and the upper straightening roller at the head of the multi-roller box, an integrated structure is adopted, simplifying roller spacing adjustment, accurately determining the pressing amount, and calculating the number of rollers through a formula to ensure that the reverse bending ratio is positively correlated with the pressing amount.
It achieves precise control over the straightening effect of high-strength steel, reduces residual stress inside the strip, lowers equipment manufacturing costs, and improves straightening quality.
Smart Images
Figure CN116727445B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of steel rolling equipment technology, and in particular to a high-strength steel multi-roll tension leveling machine and a method for determining the number of rolls thereon. Background Technology
[0002] Currently, in the straightening process in the metallurgical industry, in order to improve the strip shape of high-strength steel, a combination of tension straightening and multi-roll straightening is generally used. The main function of tension straightening is to generate elongation in the strip, while the main function of multi-roll straightening is to reduce residual stress in the strip and level the strip.
[0003] High-strength steel, especially quenched high-strength steel, has extremely high strength, with a higher yield strength compared to ordinary strip, making it more prone to cracking during straightening. Furthermore, using existing tension straighteners and multi-roll straighteners presents challenges because the pressure reduction of the tension rolls is difficult to determine precisely. For example, excessive pressure reduction on the first tension roll can lead to cracks in the strip. In actual production, determining the pressure reduction of the tension rolls is a very difficult process, resulting in unsatisfactory straightening effects for high-strength steel. Summary of the Invention
[0004] The main objective of this invention is to provide a high-strength steel multi-roll tension leveler, which facilitates the adjustment of the roll spacing to be the same, thereby simplifying the calculation process of the reduction amount.
[0005] To achieve the above objectives, the present invention provides a high-strength steel multi-roll tension leveling machine, comprising a fixed roll box, a tension leveling roll box, and a multi-roll roll box, wherein,
[0006] The tension roller box supports an upper tension roller and a support roller. The multi-roller box supports an upper straightening roller and a support roller. The fixed roller box supports a lower tension roller, a lower straightening roller, and a support roller. The lower tension roller is located below the upper tension roller and is correspondingly arranged thereto. The lower straightening roller is located below the upper straightening roller and is correspondingly arranged thereto. The upper tension roller at the tail of the tension roller box and the upper straightening roller at the head of the multi-roller box share a support roller.
[0007] Preferably, the total number of the upper straightening roller and the lower straightening roller is at least three.
[0008] Preferably, all the upper pull straightening rollers in the straightening roller box are controlled by an inlet pressing mechanism to uniformly control the pressing amount.
[0009] This invention further proposes a method for determining the number of rolls in a high-strength steel multi-roll tension leveler, comprising the following steps:
[0010] Based on the strip's dimensions and mechanical properties, a suitable average strip tension is selected, and the inverse bending ratio C of the upward straightening roll is calculated. w1 ;
[0011] Based on the mechanical properties and dimensions of the strip to be straightened, a suitable average tension of the strip is selected, and the total number of rollers n1 for the upper and lower straightening rollers is calculated.
[0012] According to the reverse bending ratio C of the upward straightening roller w1 The ratio of the reverse bending rate of the upper straightening roller to C w2 If they are equal, the total number of rollers n2, including the upper and lower straightening rollers, can be calculated.
[0013] Preferably, based on the positive correlation between the reduction amount of the upper straightening roller and the reverse bending ratio of the upper straightening roller, the calculated reverse bending ratio C of the upper straightening roller is used as the basis for further analysis. w1 Determine the amount of pressure applied to the upper straightening roller.
[0014] Preferably, the inverse bending rate of the upward straightening roller is higher than that of C. w1 The following formula is used for calculation:
[0015]
[0016] Where F is the average tension of the strip, B is the strip width, H is the strip thickness, and σ s ε is the yield strength of the strip steel. b ε represents the strain of the strip under the ultimate tensile strength condition. s The value represents the strain of the strip under the elastic limit condition.
[0017] Preferably, the total number of rollers n1 for the upper and lower straightening rollers is calculated using the following formula:
[0018]
[0019] Where, ε p The target elongation of the strip is given by E, the elastic modulus of the strip is given by E, and the average tension F of the strip is given by 0.1BHσ. s up to 0.3BHσ s between.
[0020] Preferably, the total number of rollers n2, including the upper and lower straightening rollers, is calculated using the following method:
[0021] Determine the dimensions of the upper straightening roll, the mechanical properties of the strip to be straightened, and the target residual stress value σ. p ;
[0022] Based on the size information of the upper straightening roller and the mechanical property information of the strip to be straightened, the calculation formulas for the maximum surface residual stress value σ1 and the maximum internal residual stress value σ2 of the strip to be straightened are determined.
[0023] Since both the maximum surface residual stress value σ1 and the maximum internal residual stress value σ2 are less than the target residual stress value σ pDetermine the total number of rollers, n2, including the upper and lower straightening rollers.
[0024] Preferably, the maximum surface residual stress value σ1 is calculated using the following formula:
[0025]
[0026] Where n2 is the number of upper straightening rollers, C w2 The inverse bending ratio of the upper straightening roller;
[0027] The maximum internal residual stress value σ2 is calculated using the following formula:
[0028]
[0029] Preferably, the maximum surface residual stress value σ1 and the maximum internal residual stress value σ2 are both less than the target residual stress value σ. p The specific steps for determining the total number of rollers n2, including the upper and lower straightening rollers, include:
[0030] Initially determine the reverse curvature ratio C of the upper straightening roller w2 ;
[0031] By determining the inverse bending ratio C w2 The maximum internal residual stress value σ2 was calculated.
[0032] Determine whether the maximum internal residual stress value σ2 is less than the target residual stress value σ. p ;
[0033] When the maximum internal residual stress value σ2 is greater than or equal to the target residual stress value σ p If so, then return to the initial determination of the anti-bending ratio C of the upper straightening roller. w2 The steps to correct the inverse curvature ratio C w2 ;
[0034] When the maximum internal residual stress value σ2 is less than the target residual stress value σ p When, the determined inverse curvature ratio is C w2 Substituting into the formula for calculating the maximum surface residual stress σ1, based on the fact that the maximum surface residual stress σ1 is less than the target residual stress σ... p Calculate the total number of rollers, n2, including the upper and lower straightening rollers.
[0035] The high-strength steel multi-roll straightening machine proposed in this invention requires obtaining the roll inversion bending ratio when determining the reduction amount of the straightening roll box. Since the roll inversion bending ratio is related to many factors (including roll pitch and reduction amount), by sharing a support roll with the upper straightening roll at the tail of the straightening roll box and the upper straightening roll at the head of the multi-roll box, it is easier to adjust the roll pitch of the straightening roll box and the multi-roll box to be equal, simplifying the calculation process of the roll inversion bending ratio. At this point, the roll inversion bending ratio is only positively correlated with the reduction amount, thus allowing for accurate determination of the reduction amount of the high-strength steel multi-roll straightening machine, thereby ensuring the straightening effect of high-strength steel. Furthermore, sharing a support roll with the upper straightening roll at the tail of the straightening roll box and the upper straightening roll at the head of the multi-roll box means that the straightening roll and the multi-roll straightening machine adopt an integrated structure. This saves on equipment manufacturing costs and ensures continuous inversion bending, better reducing residual stress inside the strip. Furthermore, when designing the number of tension leveling rolls and multi-roll leveling rolls, it is also necessary to obtain the reverse bending ratio of the rolls. This structure facilitates the rational design of the number of tension leveling rolls and multi-roll leveling rolls. Attached Figure Description
[0036] Figure 1 This is a schematic diagram of a preferred embodiment of the high-strength steel multi-roll tension leveling machine of the present invention;
[0037] Figure 2 This is a schematic diagram of the process for determining the upper straightening roller in the method for determining the number of rollers in the high-strength steel multi-roll tension leveler of the present invention;
[0038] Figure 3 for Figure 2 A detailed flowchart of step S3 is shown below;
[0039] Figure 4 This is a schematic diagram of the process for determining the upper straightening roller in the method for determining the number of rollers in the high-strength steel multi-roller straightening machine of the present invention.
[0040] In the figure, 1-fixed roller box, 2-pull straightening roller box, 3-multi-roller roller box, 4-upper pull straightening roller, 5-upper straightening roller, 6-lower pull straightening roller, 7-lower straightening roller, 8-inlet pressing mechanism, 9-outlet pressing mechanism, 10-inlet tension system, 11-outlet tension system.
[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0042] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0043] This invention proposes a multi-roll tension leveling machine for high-strength steel.
[0044] Reference Figure 1In this preferred embodiment, a high-strength steel multi-roll tension leveling machine includes a fixed roller box 1, a tension leveling roller box 2, and a multi-roll roller box 3, wherein...
[0045] The upper tension roller 4 (R in the figure) is supported inside the tension roller box 2. b and R d The upper straightening rollers 5 (R1, R3, R5...R1 in the figure) and support rollers are supported inside the multi-roller box 3. 11 ) and support rollers, the fixed roller box 1 supports the pull-down straightening roller 6 (R in the figure) and support rollers, and the fixed roller box 1 supports the pull-down straightening roller 6 (R in the figure) a R c and R e ), lower straightening rollers 7 (R2, R4, R6...R in the figure) 12 The upper straightening roller 6 is located below the upper straightening roller 4 and is correspondingly positioned thereto. The lower straightening roller 7 is located below the upper straightening roller 5 and is correspondingly positioned thereto. The upper straightening roller 4 at the tail of the straightening roller box 2 and the upper straightening roller 5 at the head of the multi-roller box 3 share a support roller (R1 and R2). d (Shares a single support roller).
[0046] The lower straightening roller 6 is arranged opposite to the upper straightening roller 4 to generate elongation in the strip, and the lower straightening roller 7 is arranged opposite to the upper straightening roller 5 to reduce residual stress in the strip and to level the strip.
[0047] In this embodiment, all the upper pull straightening rollers 4 of the straightening roller box 2 are uniformly controlled by the inlet pressing mechanism 8 to control the pressing amount.
[0048] Furthermore, the total number of upper straightening rollers 4 and lower straightening rollers 6 is at least three. In this embodiment, five upper straightening rollers 4 and lower straightening rollers 6 are used as an example. Because this embodiment adopts an overall pressing scheme, the overall pressing amount will be smaller than the pressing amount of a single roller (in the prior art, a large pressing amount of the first roller is needed to ensure the elongation rate, while this application uses multiple small pressing amounts to jointly ensure the elongation rate). At this time, multiple rollers are needed to achieve the elongation rate of the strip. Therefore, at least five rollers are required to ensure a good elongation rate for the strip.
[0049] The multi-roller box 3 uses an exit pressing mechanism 9 to control the pressing amount. The multi-roller box 3 is in an inclined state, which means that the pressing amount of the straightening rollers in the multi-roller box (from the inlet to the outlet direction) is decreasing.
[0050] The tension roller box 2 can have its tension roller reduction amount changed by the inlet pressing mechanism 8, and the multi-roller box 3 can have its reduction amount adjusted by the outlet pressing mechanism 9. Generally, a larger inlet pressing amount requires a larger reduction amount for the tension roller box 2 to produce elongation, while a smaller outlet pressing mechanism 9 results in a smaller reduction amount for the multi-roller box R1 to R... 11 The amount of pressure decreases.
[0051] Because the tension straightening roll box 2 requires a large reduction amount to provide elongation, the strip will have internal stress under large bending. All upper tension straightening rolls 4 use an inlet reduction mechanism 8 to uniformly control the reduction amount, and all upper straightening rolls 5 use an outlet reduction mechanism 9 to uniformly control the reduction amount. In this way, the reduction amount of the upper straightening rolls 5 decreases from the inlet to the outlet, which is conducive to achieving uniformity of residual stress inside the strip.
[0052] In this embodiment, the inlet pressing mechanism 8 and the outlet pressing mechanism 9 adopt a servo hydraulic cylinder or an electric pressing system.
[0053] Furthermore, this high-strength steel multi-roll tension leveler also includes an inlet tension system 10 located at the head of the tension leveling roll box 2.
[0054] Furthermore, this high-strength steel multi-roll tension leveler also includes an outlet tension system 11 located at the tail of the multi-roller box 3. The outlet tension system 10 and the inlet tension system 11 generally use tension rollers to provide tension.
[0055] The exit tension system and the inlet tension system provide tension to the strip. The greater the reduction of the tension leveling roll box 2, the greater the elongation. The greater the tension of the exit tension system, the greater the elongation. The inlet tension system is a passive tension, which is the value of the exit tension system minus the tension loss. The greater the reduction of the tension leveling roll box 2, the greater the tension loss, and the smaller the tension of the inlet tension system.
[0056] If the raw strip has a very good shape, there is no need to generate elongation. It is only necessary to reduce the residual stress of the strip. The purpose of the tension in the outlet tension system is to make the strip move forward. The inlet tension system can be close to 0, or it can meet the tension required for normal operation of the strip. Meeting the requirements for normal operation of the strip generally means that the requirements for strip deviation are met, and the unit speed and tension are stable.
[0057] In this embodiment, the fixed roller box 1 is fixed on the base, that is, the installation position of the fixed roller box 1 is fixed and cannot be moved up or down, while the tension roller box 2 and the multi-roller box 3 can be moved up and down to adjust the amount of pressure.
[0058] The high-strength steel multi-roll tension leveler proposed in this embodiment requires obtaining the roll inversion ratio when determining the reduction amount of the tension leveling roll box 2. Since the roll inversion ratio is related to many factors (including roll pitch and reduction amount), the upper tension leveling roll 4 at the tail of the tension leveling roll box 2 and the upper straightening roll 5 at the head of the multi-roll box 3 share a single support roll. This facilitates adjusting the roll pitch of the tension leveling roll box 2 and the multi-roll box 3 to be equal, simplifying the calculation process of the roll inversion ratio. In this case, the roll inversion ratio is only positively correlated with the reduction amount, thus allowing for accurate determination of the reduction amount of the high-strength steel multi-roll tension leveler, thereby ensuring the straightening effect of the high-strength steel. Furthermore, the upper straightening roll 4 at the tail of the straightening roll box 2 and the upper straightening roll 5 at the head of the multi-roll box 3 share a single support roll. This means the straightening rolls and multi-roll straightening rolls adopt an integrated structure. This saves on equipment manufacturing costs (existing technology separates the straightening and multi-roll straightening machines into two separate pieces, resulting in higher manufacturing costs), and ensures continuous reverse bending, thus better reducing residual stress within the strip. Moreover, when designing the number of straightening rolls and multi-roll straightening rolls, the reverse bending ratio of the rolls needs to be obtained. This structure facilitates the rational design of the number of straightening rolls and multi-roll straightening rolls.
[0059] This invention proposes a method for determining the number of rollers in a multi-roll tension leveling machine for high-strength steel.
[0060] In this preferred embodiment, refer to Figure 1 A method for determining the number of rolls in a high-strength steel multi-roll tension leveler includes the following steps:
[0061] Step S1: Based on the strip's dimensional and mechanical properties, select a suitable average strip tension and calculate the inverse bending ratio C of the upward straightening roll. w1 ;
[0062] Step S2: Based on the mechanical properties and dimensions of the strip to be straightened, select an appropriate average tension for the strip and calculate the total number of rollers n1 for the upper and lower straightening rollers.
[0063] Step S3, based on the reverse bending ratio C of the upward straightening roller. w1 The ratio of the reverse bending rate of the upper straightening roller to C w2 If they are equal, the total number of rollers n2, including the upper and lower straightening rollers, can be calculated.
[0064] In step S1, based on the positive correlation between the pressing amount of the upward straightening roller and the reverse bending ratio of the upward straightening roller, the calculated reverse bending ratio C of the upward straightening roller is used as a basis. w1 Determine the amount of pressure applied to the upper straightening roller.
[0065] The reverse bending ratio of the upper and lower straightening rollers is C w1 The following formula is used for calculation:
[0066]
[0067] Where F is the average tension of the strip, B is the strip width, H is the strip thickness, and σ s ε is the yield strength of the strip steel. b ε represents the strain of the strip under the ultimate tensile strength condition. s The value represents the strain of the strip under the elastic limit condition.
[0068] After determining the inverse bending ratio of the upper straightening roll using the above formula (1), the pressing amount of the upper straightening roll is adjusted according to the inverse bending ratio of the upper straightening roll, thereby ensuring the straightening quality of high-strength strip steel. Because determining the pressing amount of the upper straightening roll in the prior art is a very troublesome process, in this application, by sharing a support roll between the upper straightening roll at the tail of the straightening roll box and the upper straightening roll at the head of the multi-roll box, it is easy to adjust the roll spacing of the straightening roll box and the multi-roll box to be equal, simplifying the calculation process of the inverse bending ratio of the roll. At this time, the inverse bending ratio of the roll is only positively correlated with the pressing amount, thereby accurately determining the pressing amount of the high-strength steel multi-roll straightening machine, thus ensuring the straightening effect of high-strength steel.
[0069] In step S2, the total number of rollers n1 for the upper and lower straightening rollers is calculated using the following formula:
[0070]
[0071] Where, ε p The target elongation of the strip is given by E, the elastic modulus of the strip is given by E, and the average tension F of the strip is given by 0.1BHσ. s up to 0.3BHσ s between.
[0072] Using the above formula (2), the number of rollers n1 of the upward straightening roller can be calculated.
[0073] In step S3, by sharing a support roller between the upper straightening roller at the tail of the straightening roller box and the upper straightening roller at the head of the multi-roller box, the reverse bending rate of the upper straightening roller is ensured to be higher than C. w1 The ratio of the reverse bending rate of the upper straightening roller to C w2 They are equal, which simplifies the determination of the reverse curvature ratio C of the upper straightening roller. w2 This process also facilitates the calculation of the total number of rollers n2, including the upper and lower straightening rollers.
[0074] Specifically, refer to Figure 3 In step S3, the total number of rollers n2, including the upper and lower straightening rollers, is calculated using the following method:
[0075] Step S31: Determine the dimensional information of the upper straightening roller, the mechanical property information of the strip to be straightened, and the target residual stress value σ. p (target residual stress value σ) p(This refers to the stress value expected to be achieved after straightening by the upper straightening roller).
[0076] Step S32: Based on the size information of the upper straightening roller and the mechanical property information of the strip to be straightened, determine the calculation formulas for the maximum surface residual stress value σ1 and the maximum internal residual stress value σ2 of the strip to be straightened.
[0077] Step S33: Based on the fact that both the maximum surface residual stress value σ1 and the maximum internal residual stress value σ2 are less than the target residual stress value σ p Determine the total number of rollers, n2, including the upper and lower straightening rollers.
[0078] In S32, the maximum surface residual stress value σ1 is calculated using the following formula:
[0079]
[0080] Where n2 is the number of upper straightening rollers, C w2 The inverse bending ratio of the upper straightening roller;
[0081] The maximum internal residual stress value σ2 is calculated using the following formula:
[0082]
[0083] Reference Figure 4 Step S33 specifically includes:
[0084] Step S331, initially determine the reverse bending ratio C of the upper straightening roller. w2 ;
[0085] Step S332, by determining the inverse bending ratio C w2 The maximum internal residual stress value σ2 was calculated.
[0086] Step S333: Determine whether the maximum internal residual stress value σ2 is less than the target residual stress value σ. p ;
[0087] When the maximum internal residual stress value σ2 is greater than or equal to the target residual stress value σ p If the condition is met, then return to step S331 to correct the inverse curvature ratio C. w2 When the maximum internal residual stress value σ2 is less than the target residual stress value σ p If so, then proceed to step S334;
[0088] Step S334, the determined inverse curvature ratio C w2 Substituting into the calculation formula for the maximum surface residual stress value σ1 (Formula 4), based on the fact that the maximum surface residual stress value σ1 is less than the target residual stress value σ pCalculate the total number of rollers, n2, including the upper and lower straightening rollers.
[0089] We need to design σ1 and σ2 to be as close as possible to σ. p This can minimize C. w2 The smaller n and n2 are, the lower the manufacturing cost of the tension leveling machine.
[0090] The method for determining the number of rollers in a high-strength steel multi-roll tension leveler proposed in this invention can reasonably determine the number of upper straightening rollers and upper tension straightening rollers, thereby effectively reducing the residual stress in the material being straightened. Furthermore, the number of rollers determined by this design method, while meeting the straightening requirements, can minimize equipment costs.
[0091] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.
Claims
1. A method for determining the number of rolls in a high-strength steel multi-roll tension leveler, characterized in that, A high-strength steel multi-roll tension leveling machine includes a fixed roll box, a tension leveling roll box, and a multi-roll roll box, among which... The tension roller box supports an upper tension roller and a support roller. The multi-roller box supports an upper straightening roller and a support roller. The fixed roller box supports a lower tension roller, a lower straightening roller, and a support roller. The lower tension roller is located below the upper tension roller and is correspondingly arranged thereto. The lower straightening roller is located below the upper straightening roller and is correspondingly arranged thereto. The upper tension roller at the tail of the tension roller box and the upper straightening roller at the head of the multi-roller box share a support roller. The method for determining the number of rolls in a multi-roll tension leveler for high-strength steel includes the following steps: Based on the strip's dimensions and mechanical properties, a suitable average strip tension is selected, and the inverse bending ratio of the upward straightening roll is calculated. ; Based on the mechanical properties and dimensions of the strip to be straightened, a suitable average tension is selected, and the total number of upper and lower straightening rolls is calculated. ; Based on the reverse bending ratio of the upward straightening roller The ratio of the reverse bending rate of the upper straightening roller If they are equal, the total number of rollers, including the upper and lower straightening rollers, can be calculated. .
2. The method for determining the number of rolls in a high-strength steel multi-roll tension leveler as described in claim 1, characterized in that, The total number of upper and lower straightening rollers is at least three.
3. The method for determining the number of rollers in a high-strength steel multi-roll tension leveler as described in claim 1 or 2, characterized in that, All the upper pull-up rollers in the pull-up roller box are controlled by a unified inlet pressing mechanism to control the pressing amount.
4. The method for determining the number of rolls in a high-strength steel multi-roll tension leveler as described in claim 1, characterized in that, Based on the positive correlation between the reduction amount of the upper straightening roll and the reverse bending ratio of the upper straightening roll, the calculated reverse bending ratio of the upper straightening roll... Determine the amount of pressure applied to the upper straightening roller.
5. The method for determining the number of rolls in a high-strength steel multi-roll tension leveler as described in claim 1, characterized in that, The ratio of the inverse bending rate of the upper and lower straightening rollers The following formula is used for calculation: ； in, The average tension of the strip steel, For strip width, For strip thickness, For the strip yield strength, The strain of the strip under the ultimate tensile strength condition. The value represents the strain of the strip under the elastic limit condition.
6. The method for determining the number of rolls in a high-strength steel multi-roll tension leveler as described in claim 5, characterized in that, Total number of rollers for upper and lower straightening rollers Calculate using the following formula: ； in, The target elongation of the strip steel, The elastic modulus of the strip and the average tension of the strip are given. exist to between.
7. The method for determining the number of rolls in a high-strength steel multi-roll tension leveler as described in claim 5, characterized in that, Total number of rollers including upper and lower straightening rollers Calculation method used: Determine the dimensions of the upper straightening roll, the mechanical properties of the strip to be straightened, and the target residual stress value. ; Based on the dimensional information of the upper straightening roll and the mechanical property information of the strip to be straightened, the maximum surface residual stress value of the strip to be straightened is determined. and maximum internal residual stress value The calculation formula; Based on the maximum surface residual stress value and maximum internal residual stress value All are less than the target residual stress value Determine the total number of rollers, including the upper and lower straightening rollers. .
8. The method for determining the number of rolls in a high-strength steel multi-roll tension leveler as described in claim 7, characterized in that, The maximum surface residual stress value Calculate using the following formula: ； in, This refers to the number of rollers in the upper straightening roller. The inverse bending ratio of the upper straightening roller; The maximum internal residual stress value Calculate using the following formula: 。 9. The method for determining the number of rolls in a high-strength steel multi-roll tension leveler as described in claim 8, characterized in that, The maximum surface residual stress value and maximum internal residual stress value All are less than the target residual stress value Determine the total number of rollers, including the upper and lower straightening rollers. The specific steps include: Initially determine the reverse bending ratio of the upper straightening roller ; By determining the reverse curvature ratio The maximum internal residual stress value was calculated. ; Determine the maximum internal residual stress value Is it less than the target residual stress value? ; When the maximum internal residual stress value Greater than or equal to the target residual stress value If so, then return to the initial determination of the reverse bending ratio of the upper straightening roller. The steps to correct the inverse curvature ratio ; When the maximum internal residual stress value Less than the target residual stress value When, the determined inverse curvature ratio is... Substitute the maximum surface residual stress value In the calculation formula, based on the maximum surface residual stress value Less than the target residual stress value Calculate the total number of rollers including the upper and lower straightening rollers. .