CN110653267B - Control method for micro-opening welding seam of hot galvanizing unit leveling equipment - Google Patents
Control method for micro-opening welding seam of hot galvanizing unit leveling equipment Download PDFInfo
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- CN110653267B CN110653267B CN201810700884.XA CN201810700884A CN110653267B CN 110653267 B CN110653267 B CN 110653267B CN 201810700884 A CN201810700884 A CN 201810700884A CN 110653267 B CN110653267 B CN 110653267B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
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Abstract
The invention discloses a control method for a micro-open welding seam of a hot galvanizing unit leveling device, which comprises the following steps: when the distance from the weld seam of the strip steel to the vertical central axis of the temper mill is a starting distance, adjusting the set value of the rolling force of the temper mill to be the set value of the over-weld seam rolling force, adjusting the set value of the roll bending force to be the set value of the over-weld seam roll bending force, and adjusting the roll opening tension to be the over-weld seam roll opening tension; when the actual rolling force of the planisher is reduced to be within a threshold value range, the lower working roll, the crease-resist roll and the anti-breaking roll of the planisher respectively move to respective micro-opening set positions in the direction away from the rolling central line. The control method realizes the problem that the surface defects of the strip steel products are not easy to generate when the welding line passes through by setting and adjusting the temper mill, thereby improving the quality of the strip steel surface products, improving the production efficiency and the yield, and even reducing the roller consumption cost of the hot galvanizing unit.
Description
Technical Field
The invention relates to a control method of hot galvanizing unit equipment, in particular to a control method of leveling equipment of a hot galvanizing unit.
Background
For a hot galvanizing unit, a leveling device is one of key devices for realizing high surface quality of strip steel, and particularly, one important index is that the strip steel surface cannot be defected after a strip steel welding seam passes through the leveling device. However, the conventional flattening apparatus at present adopts a pressure release control mode when a weld passes through, and the control mode has various problems in the actual use process, which causes adverse effects on the surface of the strip steel, such as: the traditional leveling equipment inevitably has a minimum pressure relief value due to the adopted control mode when a welding seam passes through, so that when the welding seam passes through, an excessively thick strip welding seam can be copied to the surface of a working roll, the surface is copied to the surface of the strip by the working roll after the welding seam passes through, product defects such as roll marks are formed on the strip, and in some serious cases, the length of the product defects on the surface of the strip close to the roll marks can reach nearly 100-200 meters.
In addition, due to the product defects such as roll marks, the hot galvanizing unit cannot directly produce finished products, and the production efficiency and the yield are seriously influenced.
In order to reduce the product defects, operators have to reduce the defect degree by reducing the pressure release value, which inevitably increases the labor intensity of the operators, increases the risk of the frame of the temper mill slipping and increases the roller consumption to a certain extent.
Based on the above, a control method is desired, which can overcome the defect of rolling and printing products of the strip steel when the welding seam passes through by the existing leveling equipment control method, improve the quality of the products on the surface of the strip steel, improve the production efficiency and yield, and reduce the roll consumption cost of the hot galvanizing unit.
Disclosure of Invention
The invention aims to provide a control method for slightly opening a welding line of a hot galvanizing unit leveling device, which solves the problem that the surface defect of a strip steel product is not easy to generate when the welding line passes through by setting and adjusting a leveling machine, thereby improving the quality of the strip steel surface product, improving the production efficiency and yield and even reducing the roller consumption cost of the hot galvanizing unit.
In order to achieve the aim, the invention provides a control method for a hot galvanizing unit leveling device to slightly pass a weld joint, which comprises the following steps:
when the distance from the weld seam of the strip steel to the vertical central axis of the temper mill is a starting distance, adjusting the set value of the rolling force of the temper mill to be the set value of the over-weld seam rolling force, adjusting the set value of the roll bending force to be the set value of the over-weld seam roll bending force, and adjusting the roll opening tension to be the over-weld seam roll opening tension;
when the actual rolling force of the planisher is reduced to be within a threshold value range, the lower working roll, the crease-resist roll and the anti-breaking roll of the planisher respectively move to respective micro-opening set positions in the direction away from the rolling central line.
The working principle of the control method is explained by the condition that the control method for the hot galvanizing unit leveling equipment slightly passes through the weld joint, which is provided by the invention, is applied to the hot galvanizing unit leveling equipment:
the control method comprises the steps of adjusting the set value of the rolling force of the temper mill to the set value of the over-welding rolling force, adjusting the set value of the bending roller force to the set value of the over-welding bending roller force, adjusting the roll-opening tension to the over-welding roll-opening tension value, and enabling the lower working roll, the crease-resistant roll and the anti-breaking roll of the temper mill to respectively move to respective micro-opening set positions in the direction far away from the rolling central line when the actual rolling force of the temper mill falls within a threshold range so as to enable the welding line to pass through the temper mill without influencing the surface of the working roll of the temper mill, and after the welding line passes through the leveler, the leveler returns to the conventional working mode when the strip steel is leveled.
Through the technical scheme, the control method of the scheme solves the problem that the surface defects of the strip steel product are not easy to generate when the welding seam passes through, thereby improving the quality of the strip steel surface product, improving the production efficiency and yield, and even reducing the roller consumption cost of the hot galvanizing unit.
Further, in the control method for controlling the hot dip galvanizing unit leveling device to slightly open the weld joint, the starting distance SPM _ TRK _ X is obtained based on the following formula:
SPM_TRK_X＝(SPM_RF_CHG_TIM+R_TIME_SLOP)×SPM_ASD_SP
wherein the unit parameter of the SPM _ TRK _ X is meter; SPM _ RF _ CHG _ TIM represents the time required by the change of the rolling force, and the unit parameter of the time is second; r _ TIME _ SLOP represents the TIME required by the working roll of the temper mill to move to a micro-opening set position, and the unit parameter of the TIME is second; SPM _ ASD _ SP represents the speed of travel of the weld, with a unit parameter of meters per second.
In the above scheme, the SPM _ RF _ CHG _ TIM is determined by the temper mill rolling force SET value HGC _ RF _ SET, the overwelding rolling force SET value SPM _ SPF _ SET, and the rolling force change RATE R _ SPM _ RF _ RATE, and satisfies the following formula:
and SPM _ RF _ CHG _ TIM ═ HGC _ RF _ SET-SPM _ SPF _ SET)/R _ SPM _ RF _ RATE, where the unit parameter of HGC _ RF _ SET is KN, the unit parameter of SPM _ SPF _ SET is KN, and the unit parameter of R _ SPM _ RF _ RATE is KN/sec.
Furthermore, in some preferred embodiments, the preferred range for R _ TIME _ SLOP is from 2 to 5 seconds, while the preferred range for SPM _ ASD _ SP is from 0.3 to 0.7 meters/second.
Further, in the control method for the micro-seam passing of the hot galvanizing unit leveling equipment, the set value of the seam passing rolling force is 300-500 KN.
Further, in the control method for the micro-opening of the over-welding seam of the hot galvanizing unit leveling equipment, the set value of the over-welding seam bending roll force is 100-200 KN.
Further, in the control method for the hot dip galvanizing unit leveling equipment to slightly open the weld, the over-weld opening tension value is an average value of a leveling machine inlet tension set value and a leveling machine outlet tension set value.
Further, in the control method for controlling the hot galvanizing unit leveling equipment to slightly pass through the weld joint, the threshold value range is 40-60 KN.
Further, in the control method for the hot dip galvanizing unit leveling device to pass through the weld seam in the micro-opening manner, the distance SL _ SET from the micro-opening SET position of the lower working roll to the rolling center line is obtained based on the following formula:
SL_SET＝R_DN_PL-R_DN_BHURH-BHURH-BWR_DIA+PL_SET-PL_PV-THICK-R_SL
wherein R _ DN _ PL represents the distance between the bottom of the leveler and the rolling center line; r _ DN _ BHURH represents the distance between the bottom of the leveling machine and the circle center of the lower supporting roller; BHURH denotes the radius of the lower backup roll; BWR _ DIA represents the diameter of the lower work roll; PL _ SET represents the SET position of the rolling center line; PL _ PV represents the actual position of the rolling centerline; THICK represents the strip thickness; r _ SL represents a slight-open setting value of the lower work roll.
It should be noted that the unit parameters of R _ DN _ PL, BHURH, BWR _ DIA, PL _ SET, PL _ PV, THICK, and R _ SL are equal in length, i.e., mm or cm, and of course, m may be used uniformly, and those skilled in the art can SET the unit parameters according to the specific situation of the embodiment.
Further, in the above-described aspect, the SET position PL _ SET of the rolling center line may be determined by the following equation:
PL_SET＝R_UP_PL-R_UP_TBURH-TBURH-TWR_DIA
in the formula, R _ UP _ PL represents the distance from the top of the temper mill to the rolling center line of the unit; r _ UP _ TBURH represents the distance from the top of the temper mill to the center of the upper support roller; TBURH denotes the radius of the upper support roll; TWR _ DIA indicates the diameter of the upper work roll. It should be noted that the unit parameters of the above parameters are also length units.
The actual position PL _ PV of the rolling center line can be determined by the following equation:
PL_PV＝∑G_603ZT110_CNT×R_603ZT110_INC
in the formula: g _603ZT110_ CNT represents a pulse count, and the unit parameter is one; r _603ZT110_ INC represents a unit length of each pulse number.
Further, in the control method for the hot galvanizing unit leveling equipment to slightly open the weld joint, the set micro-opening value of the lower working roll is 3-9 mm.
Further, in the control method for the hot dip galvanizing unit leveling equipment to slightly open the weld, the distance S _ ACP between the slightly opened set position of the crease-resist roller and the rolling center line is obtained based on the following formula:
S_ACP＝Z_ACP+M_ACP×K_ACP
wherein Z _ ACP represents the zero value of the crease-resist roller(ii) a M _ ACP represents a slight opening setting value of the wrinkle-preventing roller; k _ ACP ═ 1/sin α1，α1The included angle between the crease-resist roller and the steering roller.
Further, in the control method for controlling the micro-opening welding line of the hot galvanizing unit leveling equipment, the micro-opening set value of the anti-creasing roller is-2 to-5 mm.
Further, in the control method for the hot dip galvanizing unit leveling device to slightly open the weld joint, the distance S _ BL from the slightly opened set position of the anti-breaking roll to the rolling center line is obtained based on the following formula:
S_BL＝Z_BL+M_BL×K_BL
wherein Z _ BL represents a zero value of the anti-breaking roller; m _ BL represents a slight opening set value of the anti-breaking roller; k _ BL ═ 1/sin α2，α2The included angle between the anti-breaking roller and the steering roller.
Further, in the control method for controlling the hot galvanizing unit leveling equipment to slightly open the welding line, the slightly opening set value of the anti-breaking roller is-2 to-5 mm.
The control method for the hot galvanizing unit leveling equipment to pass through the weld seam in a micro-opening mode has the following beneficial effects:
the control method of the invention realizes the problem that the surface defect of the strip steel product is not easy to generate when the welding line passes through by setting and adjusting the temper mill, thereby improving the quality of the strip steel surface product, simultaneously improving the production efficiency and the yield, and even reducing the roller consumption cost of the hot galvanizing unit.
Drawings
FIG. 1 shows the structure of a hot galvanizing unit adopting the control method for the hot galvanizing unit leveling device to slightly cross the weld joint.
Fig. 2 shows the structure of the hot galvanizing unit by adopting the control method for slightly passing the weld joint of the hot galvanizing unit leveling device.
FIG. 3 schematically shows parameter settings in the control method for controlling the micro-seam crossing of the leveling device of the hot galvanizing unit.
Detailed Description
The method for controlling the micro-seam crossing of the hot dip galvanizing unit leveling device according to the present invention will be further explained and illustrated with reference to the drawings and the specific examples, which, however, should not be construed to unduly limit the technical solution of the present invention.
FIG. 1 shows the structure of a hot galvanizing unit adopting the control method for the hot galvanizing unit leveling device to slightly cross the weld joint. Fig. 2 shows the structure of the hot galvanizing unit by adopting the control method for slightly passing the weld joint of the hot galvanizing unit leveling device.
As shown in fig. 1 and referring to fig. 2 as necessary, the hot galvanizing unit includes a pass line adjusting system 1, a support roller 2, a turning roller 3, a tension roller 4, a tension roller 5, a crease-resist roller 6, a breakage-resist roller 7, a work roller 8 and a roll bending cylinder 9, and the specific structures of the above devices or elements belong to the prior art known to those skilled in the art, and therefore, the detailed description thereof is omitted.
And (3) flattening the strip steel along the direction of F1, and when the distance from the weld seam of the strip steel to the vertical central axis L1 of the flattening machine is a starting distance, adjusting the set value of the rolling force of the flattening machine to be the set value of the over-welding rolling force, wherein in certain embodiments, the set value of the over-welding rolling force is 300-500 KN. The roll bending force setting value is adjusted to the over-weld roll bending force setting value, and in some embodiments, the over-weld roll bending force setting value is 100-200 KN. And adjusting the roll-opening tension to a over-welding seam roll-opening tension value which is the average value of the tension set value at the inlet of the temper mill and the tension set value at the outlet of the temper mill.
When the actual rolling force of the temper mill falls within a threshold range, in some embodiments, the threshold range is 40-60 KN, so that the lower work roll, the crease-resist roll 6 and the breakage-proof roll 7 of the temper mill respectively move to respective slight-opening setting positions in the direction away from the rolling center line L2.
The tension control of the leveler may be controlled by the roll opening tension, and the adjustment may be controlled by the pass line adjusting system 1.
Wherein the starting distance SPM _ TRK _ X is obtained based on the following equation:
SPM_TRK_X＝(SPM_RF_CHG_TIM+R_TIME_SLOP)×SPM_ASD_SP
in the above formula, the unit parameter of SPM _ TRK _ X is meter; SPM _ RF _ CHG _ TIM represents the time required by the change of the rolling force, and the unit parameter of the time is second; r _ TIME _ SLOP represents the TIME required by the working roll of the temper mill to move to a micro-opening set position, and the unit parameter of the TIME is second; SPM _ ASD _ SP represents the speed of travel of the weld, with a unit parameter of meters per second.
Further, the distance SL _ SET of the ajar SET position of the lower work roll 8 from the rolling center line L2 is obtained based on the following equation:
SL_SET＝R_DN_PL-R_DN_BHURH-BHURH-BWR_DIA+PL_SET-PL_PV-THICK-R_SL
wherein R _ DN _ PL represents the distance between the bottom of the leveler and the rolling center line; r _ DN _ BHURH represents the distance between the bottom of the leveler and the center of the lower support roll 2; BHURH denotes the radius of the lower backup roll 2; BWR _ DIA represents the diameter of the lower work roll; PL _ SET represents the SET position of the rolling center line L2; PL _ PV represents the actual position of the rolling center line L2; THICK represents the strip thickness; r _ SL represents a slight open setting value of the lower work roll 8.
Also, in some embodiments, the lower work roll 8 has a slight opening setting value of 3 to 9 mm.
Further, the distance S _ ACP from the rolling center line L2 to the ajar setting position of the blank holder roller 6 is obtained based on the following equation:
S_ACP＝Z_ACP+M_ACP×K_ACP
wherein, Z _ ACP represents the zero value of the crease-resist roller 6; m _ ACP represents a slight opening setting value of the wrinkle preventing roller 6; k _ ACP ═ 1/sin α1，α1The included angle between the crease-resist roller 6 and the turning roller 3.
Also, in some embodiments, the slight opening setting value of the wrinkle preventing roller 6 is-2 to-5 mm.
Further, the distance S _ BL from the rolling center line L2 of the slight opening setting position of the breakage preventing roller 7 is obtained based on the following equation:
S_BL＝Z_BL+M_BL×K_BL
wherein Z _ BL represents a zero value of the breakage prevention roller 7; m _ BL represents a slight opening setting value of the breakage preventing roller 7; k _ BL ═1/sinα2，α2Is the angle between the anti-breaking roller 7 and the turning roller 3.
And, in some embodiments, the break prevention roller 7 has a slight opening setting value of-2 to-5 mm.
To further specifically explain the parameter settings of the control method of the scheme, the thickness is 0.25-2.3 mm, the width of the strip steel is as follows: the 700 and 1630mm steel strips are taken as an example for explanation. In addition, the running speed of the leveling section adopted by the hot galvanizing unit is controlled to be 0-220 m/min.
FIG. 3 schematically shows parameter settings in the control method for controlling the micro-seam crossing of the leveling device of the hot galvanizing unit.
As shown in fig. 3, measuring each parameter can directly obtain the following parameter values: thickness of the strip steel: 0.646mm, the width of the strip steel is: 1369mm, the roll diameter of the upper supporting roll is: 1089.205mm, upper work roll diameter: 629.67mm, the roller diameter of the lower supporting roller is: 1087.77mm lower working roll diameter: 630.29mm, the distance from the top of the leveler to the rolling center line R _ UP _ PL of the unit is 1890mm, the distance from the top of the leveler to the center of the upper supporting roll R _ UP _ TBURH is 680mm, the distance between the bottom of the leveler and the rolling center line R _ DN _ PL is 2050mm, and the distance between the bottom of the leveler and the center of the lower supporting roll R _ DN _ BHURH is 715 mm.
The SET position of the rolling center line PL _ SET-R _ UP-TBURH-TWR _ DIA (i.e., PL _ SET-1890-680-1089.205/2-629.67-35.7275) was measured and calculated
In the formula, R _ UP _ PL represents the distance from the top of the temper mill to the rolling center line of the unit; r _ UP _ TBURH represents the distance from the top of the temper mill to the center of the upper support roller; TBURH denotes the radius of the upper support roll; TWR _ DIA indicates the diameter of the upper work roll. It should be noted that the unit parameters of the above parameters are also length units.
And the actual position of the rolling centerline PL _ PV can be determined by:
PL_PV＝∑G_603ZT110_CNT×R_603ZT110_INC
＝2817×0.0125
＝35.2125
in the formula: g _603ZT110_ CNT represents a pulse count, and the unit parameter is one; r _603ZT110_ INC represents a unit length of each pulse number.
The ajar setting value R _ SL of the lower work roll was set to 6mm, from which: the distance SL _ SET-R _ DN _ PL-R _ DN _ BHURH-BHURH-BWR _ DIA + PL _ SET-PL-THICK-R _ SL ═ 2050-.
Further, the starting distance SPM _ TRK _ X (SPM _ RF _ CHG _ TIM + R _ TIME _ slope) × SPM _ ASD _ SP (1.1812+2.5) × 0.5 ═ 1.8406m
Wherein, SPM _ RF _ CHG _ TIM represents the time required by the change of the rolling force, the unit parameter is second, and the value is obtained by calculating the change value before and after the rolling force by dividing the change rate of the rolling force; r _ TIME _ slope represents the TIME required for the work roll of the leveler to move to the ajar setting position, and the value setting range may be 2 to 5 seconds, and in the present embodiment, the value is 2.5 seconds; the SPM _ ASD _ SP represents the traveling speed of the weld, and the set value may be in the range of 0.3-0.7 m/s, and in the present embodiment, is 0.5 m/s.
When the actual rolling force of the planishing mill is reduced to 40-60 KN, the lower working roll 8, the crease-resist roll 6 and the anti-breaking roll 7 of the planishing mill are respectively moved to respective slight opening setting positions in the direction far away from the rolling center line L2,
the distance S _ ACP from the rolling center line to the ajar set position of the blank holder roll 6 is obtained based on the following equation:
S_ACP＝Z_ACP+M_ACP×K_ACP＝96+(-3)×2＝90mm
wherein Z _ ACP represents a zero value of the wrinkle-proof roll, and a value thereof is 96mm in the present embodiment; m _ ACP represents a micro-opening set value of the crease-resist roller, the value range of the M _ ACP can be-2 to-5 mm, and the value is-3 mm in the embodiment; k _ ACP ═ 1/sin α1，α1In order to prevent the angle between the creasing roller and the turning roller, in this embodiment, alpha1Is 30 DEG sin alpha1＝1/2。
The distance S _ BL from the rolling center line to the ajar set position of the breakage prevention roller 7 is obtained based on the following equation:
S_BL＝Z_BL+M_BL×K_BL＝96+(-3)×2＝90mm
wherein Z _ BL represents a zero value of the breakage prevention roller, and the value is 96mm in the present embodiment; m _ BL represents a slight opening set value of the anti-breaking roller, and the value range of M _ BL can be-2 to-5 mm, and in the embodiment, the value is-3 mm; k _ BL ═ 1/sin α2，α2To prevent the angle between the roll and the turning roll from being broken, in the present embodiment, α2Is 30 DEG sin alpha2＝1/2。
It should be noted that the inlet tension of the leveler is set as: 65KN, the temper mill outlet tension sets up to: 70KN, and therefore the over-weld opening roll tension value was 67.5 KN. The rolling force of the strip steel is set as follows: 3333KN, elongation set to: 1.4, and the speed of the over-temper mill is: 30m/min, and the set value of the roll force of the over-welding seam is as follows: 380KN and 150KN as the overbeam bending force.
Through the setting, the control method of the scheme realizes the problem that the surface defects of the strip steel product are not easy to generate when the welding seam passes through, thereby improving the quality of the strip steel surface product, improving the production efficiency and yield, and even reducing the roller consumption cost of the hot galvanizing unit.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.
Claims (9)
1. A control method for a hot galvanizing unit leveling device to slightly pass a weld seam is characterized in that:
when the distance from the weld seam of the strip steel to the vertical central axis of the temper mill is a starting distance, adjusting the set value of the rolling force of the temper mill to be the set value of the over-weld seam rolling force, adjusting the set value of the roll bending force to be the set value of the over-weld seam roll bending force, and adjusting the roll opening tension to be the over-weld seam roll opening tension; when the actual rolling force of the temper mill is reduced to be within a threshold value range, a lower working roll, a crease-resist roll and a breakage-proof roll of the temper mill are respectively moved to respective ajar set positions in the direction away from a rolling central line;
wherein the distance SL _ SET from the micro-opening SET position of the lower working roll to the rolling center line is obtained based on the following formula:
SL_SET＝R_DN_PL-R_DN_BHURH-BHURH-BWR_DIA+PL_SET-PL_PV-THICK-R_SL
wherein R _ DN _ PL represents the distance between the bottom of the leveler and the rolling center line;
r _ DN _ BHURH represents the distance between the bottom of the leveling machine and the circle center of the lower supporting roller; BHURH denotes the radius of the lower backup roll; BWR _ DIA represents the diameter of the lower work roll;
PL _ SET represents the SET position of the rolling center line; PL _ PV represents the actual position of the rolling centerline; THICK represents the strip thickness; r _ SL represents a slight opening set value of the lower working roll;
wherein the distance S _ ACP from the micro-opening setting position of the crease-resist roll to the rolling center line is obtained based on the following formula:
S_ACP＝Z_ACP+M_ACP×K_ACP
wherein Z _ ACP represents a zero value of the crease-resist roller; m _ ACP represents a slight opening setting value of the wrinkle-preventing roller; k _ ACP ═ 1/sin α1，α1The included angle between the crease-resist roller and the steering roller is formed;
wherein the distance S _ BL between the slight opening set position of the breakage-proof roller and the rolling center line is obtained based on the following formula:
S_BL＝Z_BL+M_BL×K_BL
wherein Z _ BL represents a zero value of the anti-breaking roller; m _ BL represents a slight opening set value of the anti-breaking roller; k _ BL ═ 1/sin α2，α2The included angle between the anti-breaking roller and the steering roller.
2. The method for controlling the micro-seam crossing of the leveling device of the hot galvanizing unit according to claim 1, wherein the starting distance SPM _ TRK _ X is obtained based on the following formula:
SPM_TRK_X＝(SPM_RF_CHG_TIM+R_TIME_SLOP)×SPM_ASD_SP
wherein the unit parameter of the SPM _ TRK _ X is meter; SPM _ RF _ CHG _ TIM represents the time required by the change of the rolling force, and the unit parameter of the time is second; r _ TIME _ SLOP represents the TIME required by the working roll of the temper mill to move to a micro-opening set position, and the unit parameter of the TIME is second; SPM _ ASD _ SP represents the speed of travel of the weld, with a unit parameter of meters per second.
3. The method for controlling the micro-opening of the weld joint of the leveling equipment of the hot galvanizing unit according to claim 1, wherein the set value of the rolling force of the weld joint is 300-500 KN.
4. The method for controlling the micro-opening of the welding line of the leveling equipment of the hot galvanizing unit according to claim 1, wherein the set value of the bending force of the welding line is 100-200 KN.
5. The method for controlling the micro-open weld of the leveling device of the hot galvanizing unit as set forth in claim 1, wherein the over-weld roll-opening tension value is an average value of a leveling machine inlet tension set value and a leveling machine outlet tension set value.
6. The method for controlling the micro-seam crossing of the leveling equipment of the hot galvanizing unit according to claim 1, wherein the threshold value ranges from 40 KN to 60 KN.
7. The method for controlling the micro-opening welding line of the leveling equipment of the hot galvanizing unit as set forth in claim 1, wherein the micro-opening set value of the lower working roll is 3-9 mm.
8. The method for controlling the slight opening of the welding line of the leveling equipment of the hot galvanizing unit according to claim 1, wherein the slight opening setting value of the anti-creasing roller is-2 to-5 mm.
9. The method for controlling the slight opening of the welding line of the leveling equipment of the hot galvanizing unit according to claim 1, wherein the slight opening set value of the breakage-proof roller is-2 to-5 mm.
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