CN114130812B - HRB600 high-strength anti-seismic steel bar rolling process - Google Patents
HRB600 high-strength anti-seismic steel bar rolling process Download PDFInfo
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- CN114130812B CN114130812B CN202111352213.7A CN202111352213A CN114130812B CN 114130812 B CN114130812 B CN 114130812B CN 202111352213 A CN202111352213 A CN 202111352213A CN 114130812 B CN114130812 B CN 114130812B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 169
- 239000010959 steel Substances 0.000 title claims abstract description 169
- 238000005096 rolling process Methods 0.000 title claims abstract description 134
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000010008 shearing Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
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Abstract
The invention relates to a HRB600 high-strength anti-seismic steel bar rolling process, which relates to the technical field of steel bar rolling.A control module controls to convey a steel billet to a heating furnace through a conveying roller to be heated to a first preset temperature T1, and conveys the steel billet to a roughing mill for roughing when the heating is finished, so as to obtain roughing round steel; when rough rolling is finished, the acquisition module acquires the diameter D of the rough-rolled steel bar detected by the first laser diameter gauge, and when the rough-rolled steel bar is determined to be finished, the rough-rolled steel bar is cooled to a preset temperature range Ty through a water cooling tank; the control module determines the roller spacing between a driving roller and a driven roller of a finishing mill roller according to the diameter D and conveys the rough rolled round steel subjected to temperature reduction to a finishing mill for finish rolling to obtain finish rolled ribbed round steel; the control module conveys the finish rolled ribbed round steel subjected to finish rolling to a shearing machine for shearing and then naturally cools the sheared round steel to obtain the HRB600 high-strength anti-seismic reinforcing steel bar; the control precision of the rolling process is improved, and therefore the quality of the rolled steel bars is further improved.
Description
Technical Field
The invention relates to the technical field of steel bar rolling, in particular to a HRB600 high-strength anti-seismic steel bar rolling process.
Background
The hot-rolled ribbed steel bar is a novel building steel variety which develops rapidly at home and abroad in the late twentieth century. The hot-rolled ribbed steel bar has the advantages of high strength, good earthquake resistance and the like, and is a main product for building and bridge construction.
At present, the high-strength steel bars on the market are also HRB500 steel bars which are inferior to HRB600 steel bars in toughness and strength. The prior art hot rolled ribbed steel bar production facility generally uses a hot rolling unit to hot roll the steel bar stock to produce ribbed steel bars. At present, a common method adopts a controlled rolling and controlled cooling process to produce the steel bar simultaneously, namely low-temperature initial rolling, pre-water cooling before finish rolling and controlled cooling after finish rolling, but the method not only has the defects of large rolling pressure and high power consumption,
the HRB600 steel bar hot rolling has higher requirements on the metallographic structure, the yield strength and the tensile capacity, and the standard is stricter; therefore, the control precision of the rolling process of the existing hot rolling production technology based on the HBR500 cannot meet the production requirement of the HRB600 steel bar.
Disclosure of Invention
Therefore, the invention provides a HRB600 high-strength anti-seismic steel bar rolling process, which is used for solving the problem that the control precision of a hot rolling production technology in the prior art on a rolling process cannot meet the production requirement of an HRB600 steel bar.
In order to achieve the purpose, the invention provides a HRB600 high-strength anti-seismic steel bar rolling process, which comprises the following steps:
s1, the control module controls to convey the steel billet to the heating furnace through the conveying roller to be heated to a first preset temperature T1, and conveys the steel billet to the roughing mill to be roughly rolled when the heating is finished, so that roughly rolled round steel is obtained;
step S2, when rough rolling is completed, the obtaining module obtains the diameter D of the rough-rolled steel bar detected by the first laser diameter gauge, and when the rough-rolled steel bar is determined to be completed, the rough-rolled steel bar is cooled to a preset temperature range Ty through a water cooling tank;
step S3, the control module determines the roller spacing between a driving roller and a driven roller of a finishing mill roller according to the diameter D and conveys the rough rolled round steel subjected to temperature reduction to a finishing mill for finish rolling to obtain finish rolled ribbed round steel;
s4, conveying the finish-rolled ribbed round steel subjected to finish rolling to a shearing machine by a control module, shearing and naturally cooling to obtain the HRB600 high-strength anti-seismic steel bar;
in the step S3, the obtaining module obtains a pre-finish rolling temperature Tq of the rough rolled round steel detected by the first temperature sensor disposed above the conveying roller, obtains a finish rolling temperature Tz detected by the second temperature sensor disposed after the third finishing mill when the finish rolled round steel exits the third finishing mill, and obtains a diameter Dj of the finish rolled round steel detected by the second laser diameter gauge, and the control module analyzes and determines whether the finish rolled round steel is qualified or not according to the diameter Dj of the finish rolled round steel, and adjusts parameters of the heating furnace, the rough rolling mill and the finishing mill according to an analysis result when the finish rolled round steel is unqualified.
Further, in the step S3, when the control module determines the roller spacing between the driving roller and the driven roller of the front 3 finishing mill rollers according to the diameter D of the rough rolling round steel, the control module compares the diameter D of the rough rolling round steel with the preset diameter of the rough rolling round steel set therein, and determines the roller spacing of the finishing mill rollers according to the comparison result,
wherein the control module is provided with a first preset rough rolling round steel diameter D1, a second preset rough rolling round steel diameter D2, a third preset rough rolling round steel diameter D3, a first roller spacing H1, a second roller spacing H2 and a third roller spacing H3, wherein D1 is more than D2 and more than D3, H1 is more than H2 and more than H3,
when D is not more than D1, the control module determines that the roller spacing between the driving roller and the driven roller of the finishing mill roller is a first roller spacing H1;
when D1 is more than D and less than or equal to D2, the control module determines the roll spacing between the driving roll and the driven roll of the finishing mill roll to be a second roll spacing H2;
and when D2 is more than or equal to D3, the control module determines the roll spacing between the driving roll and the driven roll of the finishing mill roll to be the third roll spacing H3.
Further, in the step S3, when the rough rolled round steel is finish rolled, the control module analyzes and determines whether the finish rolled round steel is qualified according to the diameter Dj of the finish rolled round steel, the control module calculates the resilience W of the finish rolled round steel according to the diameter Dj of the finish rolled round steel and the roll inner diameter U of the 3 rd finishing mill, preliminarily determines whether the finish rolled round steel is qualified according to a comparison result between the resilience W and a preset resilience range W0, the preset resilience range W0 includes a minimum resilience Wmin and a maximum resilience Wmax,
if W belongs to W0, the control module preliminarily judges that the finish rolled round steel is qualified;
if W is larger than Wmax, the control module preliminarily judges that the finish rolling round steel is unqualified;
and if W is less than Wmin, the control module judges that the finish rolled round steel is unqualified.
Further, when the control module preliminarily judges that the finish rolled round steel is qualified, the control module obtains the elongation P of the finish rolled round steel finish rolled by the first three finish rolling mills, compares the elongation P with a preset elongation P0, determines whether the finish rolled round steel is qualified according to the comparison result,
if the P is larger than or equal to P0, the control module judges that the finish rolling round steel is qualified;
and if P is less than P0, the control module judges that the finish rolled round steel is unqualified.
Further, when the control module preliminarily judges that the finish rolling round steel is unqualified, the control module calculates a first rebound quantity difference Wa between the rebound quantity W and a preset maximum rebound quantity Wmax, sets a range Wa = W-Wmax, selects a corresponding interval adjusting coefficient according to a comparison result of the rebound quantity difference and the preset rebound quantity difference to adjust the roller interval,
wherein the control module is further provided with a first preset spring-back difference W1, a second spring-back difference W2, a third spring-back difference W3, a first interval adjustment coefficient K1, a second interval adjustment coefficient K2 and a third interval adjustment coefficient K3, wherein the Δ W1 is less than the Δ W2 less than the Δ W3, 0.5 < K3 < K2 < K1 < 1 are set,
when the Wa is not more than W1, the control module selects a first interval adjustment coefficient K1 to adjust the interval between the rollers;
when the Δ W1 is less than or equal to the Wa W2, the control module selects a second distance adjusting coefficient K2 to adjust the distance between the rollers;
when the Δ W2 is less than or equal to the Δ W3, the control module selects a third spacing adjustment coefficient K3 to adjust the spacing between the rollers;
when the control module selects the ith distance adjusting coefficient Ki to adjust the distance between the rollers, i =1, 2 and 3 are set, the control module sets the adjusted distance between the rollers to Hk, and Hk = Hn multiplied Ki and n =1, 2 and 3 are set.
Further, when the control module judges that the finish rolling round steel is unqualified and W is less than Wmin, the control module calculates a second springback value difference value Wb between the springback value W and the preset minimum springback value Wmin, sets Wb = Wmin-W, selects a corresponding temperature adjusting coefficient according to a comparison result of the second springback value difference value and the preset springback value difference value to adjust the first preset temperature T1,
wherein the control module is also provided with a first temperature regulating coefficient Kt1, a second temperature regulating coefficient Kt2 and a third temperature regulating coefficient Kt3, Kt3 and Kt2 and Kt1 are set to be 0.5 and 2 respectively,
when the Δ Wb is not more than W1, the control module selects a first temperature adjustment coefficient Kt1 to adjust a first preset temperature T1;
when the Δ W1 is less than or equal to the Wb W2, the control module selects a second temperature adjustment coefficient Kt2 to adjust the first preset temperature T1;
when the Δ W2 is less than or equal to the Wb W3, the control module selects a third temperature adjustment coefficient Kt3 to adjust the first preset temperature T1;
when the control module selects the r-th temperature adjustment coefficient Ktr to adjust the first preset temperature T1, r =1, 2, 3 is set, the control module sets the adjusted first preset temperature to be T2, and sets T2= T1 × Ktr.
Further, when the control module judges that the finish rolling round steel is unqualified and P is less than P0, the control module calculates a finish rolling temperature difference Ta between the temperature Tq before finish rolling and the finish rolling temperature Tz detected by the second temperature sensor, sets Ta = Tq-Tz, and determines whether to adjust the frequency of a high-frequency generator behind a third finishing mill according to a comparison result of the finish rolling temperature difference and a preset finish rolling temperature difference Ta0,
if Ta >, Ta0, the control module determines to adjust the frequency of the high-frequency generator;
if Δ Ta is less than or equal to Ta0, the control module judges that the frequency of the high-frequency generator is not adjusted.
Further, when the control module determines to adjust the frequency of the high-frequency generator, the control module calculates an elongation difference P between the elongation P and a preset elongation P0, sets a corresponding frequency adjustment coefficient according to a comparison result of the elongation difference P = P0-P, adjusts the frequency adjustment coefficient,
wherein the control module is further provided with a first preset elongation difference P1, a second preset elongation difference P2, a third preset elongation difference P3, a first frequency adjustment coefficient Kp1, a second frequency adjustment coefficient Kp2 and a third frequency adjustment coefficient Kp3, wherein the Δ P1 <. Δ P2 <. Δ P3, 1 < Kp1 < Kp2 < Kp3 < 1.5 are set,
when the Δ P is less than or equal to P1, the control module selects a first frequency adjustment coefficient Kp1 to adjust the frequency of the high-frequency generator;
when the Δ P1 is less than or equal to P2, the control module selects a second frequency adjusting coefficient Kp2 to adjust the frequency of the high-frequency generator;
when the Δ P2 is less than or equal to P3, the control module selects a third frequency adjusting coefficient Kp3 to adjust the frequency of the high-frequency generator;
when the control module selects the e-th frequency adjustment coefficient Kpe to adjust the frequency of the high-frequency generator, the control module sets the adjusted frequency of the high-frequency generator to be Pk, and sets Pk = Pm multiplied by Kpe and Pm as the initial frequency of the high-frequency generator.
Further, when the control module finishes the frequency adjustment of the high-frequency generator, the control module selects a corresponding distance correction coefficient according to the comparison result of the elongation difference and a preset elongation difference to correct the roller distance,
wherein the control module is also provided with a first pitch correction coefficient X1, a second pitch correction coefficient X2 and a third pitch correction coefficient X3, wherein the setting is that X3 is more than 0.7 and X2 is more than X1 and less than 1,
when the Δ P is not more than P1, the control module selects a first interval correction coefficient X1 to correct the roller interval;
when the Δ P1 is less than or equal to P2, the control module selects a second pitch correction coefficient X2 to correct the roller pitch;
when the Δ P2 is less than or equal to P3, the control module selects a third pitch correction coefficient X3 to correct the roller pitch;
when the control module selects the s-th pitch correction coefficient Xs to correct the roll pitch, setting s =1, 2 and 3, and setting Hx = Hk Xs to the corrected roll pitch.
Further, in the step S3, the control module determines an initial frequency of the high frequency generator based on a comparison of the pre-finish rolling temperature Tq and a preset pre-finish rolling temperature,
wherein the control module is also provided with a first preset temperature Tq1 before finish rolling, a second preset temperature Tq2 before finish rolling, a third preset temperature Tq3 before finish rolling, a first initial frequency P1, a second initial frequency P2 and a third initial frequency P3, wherein Tq1 is more than Tq2 and more than Tq3, P1 is more than P2 and more than P3,
when Tq is not greater than Tq1, the control module sets the initial frequency of the high-frequency generator to a first initial frequency P1;
when Tq1 < Tq ≦ Tq2, the control module sets the initial frequency of the high frequency generator to a second initial frequency P2;
when Tq2 < Tq ≦ Tq3, the control module sets the initial frequency of the high frequency generator to a third initial frequency P3.
Compared with the prior art, the invention has the beneficial effects that when the steel bar is finish rolled, the temperature sensors and the laser diameter measuring instruments are arranged among the plurality of finish rolling machines, whether the rough rolling and the finish rolling of the steel bar are qualified or not is determined according to the detection result of the laser diameter measuring instruments and the elongation rate of the steel bar during the finish rolling, and when the judgment is unqualified, the temperature of the heating furnace before the rough rolling is adjusted and/or the roller spacing during the finish rolling is adjusted, so that the control precision of the rolling process is improved, and the quality of the rolled steel bar is further improved.
Particularly, the laser diameter measuring instrument and the temperature sensor are arranged behind the third finishing mill to serve as detection points, so that the finishing mills before and after the detection points can be adjusted in the finish rolling process, unqualified steel bars are reduced, and the waste material amount is further reduced.
Particularly, the diameter of the steel bar rolled after the third finishing mill is detected by the laser diameter gauge, the resilience amount of the steel bar in the finishing process is calculated according to the detected diameter, whether the finished round steel is qualified or not is judged according to the resilience amount, and when the round steel is unqualified, the heating furnace, the roughing mill and the finishing mill are correspondingly subjected to parameter adjustment according to the actual resilience amount, so that the control precision of the rolling process is further improved, and the quality of the rolled steel bar is further improved.
Furthermore, the control module is provided with a plurality of preset rough rolling round steel diameters and roll intervals, the diameters of the rough rolling round steel are detected after rough rolling and cooling of the water cooling tank, and the roll intervals of the rolls of the finish rolling mill during finish rolling are determined according to the actual detection result and the comparison result of the preset rough rolling round steel diameters, so that the control precision of the rolling process is further improved, and the quality of the rolled steel bars is further improved.
Furthermore, the control module is provided with a preset resilience range and a preset elongation, the resilience of the finish rolling round steel is calculated according to the diameter of the finish rolling round steel detected by the laser diameter gauge and the inner diameter of the roller of the third finish rolling mill, and whether the finish rolling round steel is qualified or not is judged according to the comparison result of the resilience and the preset resilience range and the comparison result of the actual elongation and the preset elongation, so that the control precision of the rolling process is further improved, and the quality of the rolled steel bar is further improved.
Furthermore, the control module is provided with a plurality of preset springback difference values and spacing adjustment coefficients, when the finish rolling round steel is preliminarily judged to be unqualified and the springback is too large, the springback difference value between the actual springback and the preset maximum springback is calculated, and the corresponding spacing adjustment coefficient is selected according to the comparison result of the springback difference value and the preset springback difference value to adjust the spacing of the rolls of the finish rolling mill, so that the control precision of the rolling process is further improved, and the quality of the rolled steel bar is further improved.
Furthermore, the control module is provided with a plurality of preset elongation difference values and interval correction coefficients, when the judgment result shows that the finished round steel is unqualified, the resilience is overlarge and the elongation is insufficient, the elongation difference value between the actual elongation and the preset elongation is calculated, and the corresponding correction coefficient is selected according to the comparison result of the elongation difference value and the preset elongation difference value to correct the interval of the rollers, so that the control precision of the rolling process is further improved, and the quality of the rolled steel bar is further improved.
Drawings
Fig. 1 is a flow chart of the HRB600 high-strength aseismic steel bar rolling process of the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in conjunction with the following examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a flow chart of a rolling process of the HRB600 high-strength anti-seismic steel bar according to the present invention.
The HRB600 high-strength anti-seismic steel bar rolling process provided by the embodiment of the invention comprises the following steps:
s1, the control module controls to convey the steel billet to the heating furnace through the conveying roller to be heated to a first preset temperature T1, and conveys the steel billet to the roughing mill to be roughly rolled when the heating is finished, so that roughly rolled round steel is obtained;
step S2, when rough rolling is completed, the obtaining module obtains the diameter D of the rough-rolled steel bar detected by the first laser diameter gauge, and when the rough-rolled steel bar is determined to be completed, the rough-rolled steel bar is cooled to a preset temperature range Ty through a water cooling tank;
step S3, the control module determines the roller spacing between a driving roller and a driven roller of a finishing mill roller according to the diameter D and conveys the rough rolled round steel subjected to temperature reduction to a finishing mill for finish rolling to obtain finish rolled ribbed round steel;
s4, conveying the finish-rolled ribbed round steel subjected to finish rolling to a shearing machine by a control module, shearing and naturally cooling to obtain the HRB600 high-strength anti-seismic steel bar;
in the step S3, the obtaining module obtains a pre-finish rolling temperature Tq of the rough rolled round steel detected by the first temperature sensor disposed above the conveying roller, obtains a finish rolling temperature Tz detected by the second temperature sensor disposed after the third finishing mill when the finish rolled round steel exits the third finishing mill, and obtains a diameter Dj of the finish rolled round steel detected by the second laser diameter gauge, and the control module analyzes and determines whether the finish rolled round steel is qualified or not according to the diameter Dj of the finish rolled round steel, and adjusts parameters of the heating furnace, the rough rolling mill and the finishing mill according to an analysis result when the finish rolled round steel is unqualified.
Specifically, in the step S3, when the control module determines the roller spacing between the driving roller and the driven roller of the front 3 finishing mill rollers according to the diameter D of the rough rolling round steel, the control module compares the diameter D of the rough rolling round steel with the preset diameter of the rough rolling round steel set therein, and determines the roller spacing of the finishing mill rollers according to the comparison result,
wherein the control module is provided with a first preset rough rolling round steel diameter D1, a second preset rough rolling round steel diameter D2, a third preset rough rolling round steel diameter D3, a first roller spacing H1, a second roller spacing H2 and a third roller spacing H3, wherein D1 is more than D2 and more than D3, H1 is more than H2 and more than H3,
when D is not more than D1, the control module determines that the roller spacing between the driving roller and the driven roller of the finishing mill roller is a first roller spacing H1;
when D1 is more than D and less than or equal to D2, the control module determines the roll spacing between the driving roll and the driven roll of the finishing mill roll to be a second roll spacing H2;
and when D2 is more than or equal to D3, the control module determines the roll spacing between the driving roll and the driven roll of the finishing mill roll to be the third roll spacing H3.
Specifically, in the step S3, when the rough rolled round bar is finish rolled, the control module analyzes and determines whether the finish rolled round bar is qualified or not according to the diameter Dj of the finish rolled round bar, calculates the springback value W of the finish rolled round bar according to the diameter Dj of the finish rolled round bar and the roll inner diameter U of the 3 rd finishing mill, preliminarily determines whether the finish rolled round bar is qualified or not according to a comparison result between the springback value W and a preset springback value range W0, wherein the preset springback value range W0 includes a minimum springback value Wmin and a maximum springback value Wmax,
if W belongs to W0, the control module preliminarily judges that the finish rolled round steel is qualified;
if W is larger than Wmax, the control module preliminarily judges that the finish rolling round steel is unqualified;
and if W is less than Wmin, the control module judges that the finish rolled round steel is unqualified.
Specifically, when the control module preliminarily determines that the finish rolled round steel is qualified, the control module acquires the elongation P of the finish rolled round steel finish-rolled by the first three finish rolling mills, compares the elongation P with a preset elongation P0, and determines whether the finish rolled round steel is qualified according to the comparison result,
if the P is larger than or equal to P0, the control module judges that the finish rolling round steel is qualified;
and if P is less than P0, the control module judges that the finish rolled round steel is unqualified.
Specifically, when the control module preliminarily judges that the finish rolled round steel is unqualified, the control module calculates a first rebound quantity difference Wa between the rebound quantity W and a preset maximum rebound quantity Wmax, sets a distance Wa = W-Wmax, selects a corresponding distance adjusting coefficient according to a comparison result of the rebound quantity difference and the preset rebound quantity difference to adjust the roller distance,
wherein the control module is further provided with a first preset spring-back difference W1, a second spring-back difference W2, a third spring-back difference W3, a first interval adjustment coefficient K1, a second interval adjustment coefficient K2 and a third interval adjustment coefficient K3, wherein the Δ W1 is less than the Δ W2 less than the Δ W3, 0.5 < K3 < K2 < K1 < 1 are set,
when the Wa is not more than W1, the control module selects a first interval adjustment coefficient K1 to adjust the interval between the rollers;
when the Δ W1 is less than or equal to the Wa W2, the control module selects a second distance adjusting coefficient K2 to adjust the distance between the rollers;
when the Δ W2 is less than or equal to the Δ W3, the control module selects a third spacing adjustment coefficient K3 to adjust the spacing between the rollers;
when the control module selects the ith interval adjusting coefficient Ki to adjust the roller interval, setting i =1, 2 and 3, and setting the adjusted roller interval to Hk by the control module, and setting Hk = Hn multiplied by Ki and n =1, 2 and 3.
Specifically, when the control module judges that the finish rolled round steel is unqualified and W is less than Wmin, the control module calculates a second springback value difference Wb between the springback value W and the preset minimum springback value Wmin, sets Wb = Wmin-W, selects a corresponding temperature adjusting coefficient according to a comparison result of the second springback value difference and the preset springback value difference to adjust the first preset temperature T1,
wherein the control module is also provided with a first temperature regulating coefficient Kt1, a second temperature regulating coefficient Kt2 and a third temperature regulating coefficient Kt3, Kt3 and Kt2 and Kt1 are set to be 0.5 and 2 respectively,
when the Δ Wb is not more than W1, the control module selects a first temperature adjustment coefficient Kt1 to adjust a first preset temperature T1;
when the Δ W1 is less than or equal to W2, the control module selects a second temperature adjustment coefficient Kt2 to adjust the first preset temperature T1;
when the Δ W2 is less than or equal to the Wb W3, the control module selects a third temperature adjustment coefficient Kt3 to adjust the first preset temperature T1;
when the control module selects the r-th temperature adjustment coefficient Ktr to adjust the first preset temperature T1, r =1, 2, 3 is set, the control module sets the adjusted first preset temperature to be T2, and sets T2= T1 × Ktr.
Specifically, when the control module judges that the finish rolling round steel is unqualified and P is less than P0, the control module calculates a finish rolling temperature difference Ta between the temperature Tq before finish rolling and the finish rolling temperature Tz detected by the second temperature sensor, sets Ta = Tq-Tz, determines whether to adjust the frequency of a high-frequency generator behind a third finishing mill according to a comparison result of the finish rolling temperature difference and a preset finish rolling temperature difference Ta0,
if Ta >, Ta0, the control module determines to adjust the frequency of the high-frequency generator;
if Δ Ta is less than or equal to Ta0, the control module judges that the frequency of the high-frequency generator is not adjusted.
Specifically, when the control module determines to adjust the frequency of the high-frequency generator, the control module calculates an elongation difference P between the elongation P and a preset elongation P0, sets P = P0-P, selects a corresponding frequency adjustment coefficient to adjust according to a comparison result of the elongation difference and the preset elongation difference,
wherein the control module is further provided with a first preset elongation difference P1, a second preset elongation difference P2, a third preset elongation difference P3, a first frequency adjustment coefficient Kp1, a second frequency adjustment coefficient Kp2 and a third frequency adjustment coefficient Kp3, wherein the Δ P1 <. Δ P2 <. Δ P3, 1 < Kp1 < Kp2 < Kp3 < 1.5 are set,
when the Δ P is less than or equal to P1, the control module selects a first frequency adjustment coefficient Kp1 to adjust the frequency of the high-frequency generator;
when the Δ P1 is less than or equal to P2, the control module selects a second frequency adjusting coefficient Kp2 to adjust the frequency of the high-frequency generator;
when the Δ P2 is less than or equal to P3, the control module selects a third frequency adjusting coefficient Kp3 to adjust the frequency of the high-frequency generator;
when the control module selects the e-th frequency adjustment coefficient Kpe to adjust the frequency of the high-frequency generator, the control module sets the adjusted frequency of the high-frequency generator to be Pk, and sets Pk = Pm multiplied by Kpe and Pm as the initial frequency of the high-frequency generator.
Specifically, when the control module finishes the frequency adjustment of the high-frequency generator, the control module selects a corresponding distance correction coefficient according to the comparison result of the elongation difference and a preset elongation difference to correct the roller distance,
wherein the control module is also provided with a first pitch correction coefficient X1, a second pitch correction coefficient X2 and a third pitch correction coefficient X3, wherein the setting is that X3 is more than 0.7 and X2 is more than X1 and less than 1,
when the Δ P is not more than P1, the control module selects a first interval correction coefficient X1 to correct the roller interval;
when the Δ P1 is less than or equal to P2, the control module selects a second pitch correction coefficient X2 to correct the roller pitch;
when the Δ P2 is less than or equal to P3, the control module selects a third pitch correction coefficient X3 to correct the roller pitch;
when the control module selects the s-th pitch correction coefficient Xs to correct the roll pitch, s =1, 2, 3 is set, and the control module sets the corrected roll pitch to Hx and sets Hx = Hk × Xs.
Specifically, in the step S3, the control module determines the initial frequency of the high-frequency generator based on the comparison of the pre-finish rolling temperature Tq and a preset pre-finish rolling temperature,
wherein the control module is also provided with a first preset temperature Tq1 before finish rolling, a second preset temperature Tq2 before finish rolling, a third preset temperature Tq3 before finish rolling, a first initial frequency P1, a second initial frequency P2 and a third initial frequency P3, wherein Tq1 is more than Tq2 and more than Tq3, P1 is more than P2 and more than P3,
when Tq is not greater than Tq1, the control module sets the initial frequency of the high-frequency generator to a first initial frequency P1;
when Tq1 < Tq ≦ Tq2, the control module sets the initial frequency of the high frequency generator to a second initial frequency P2;
when Tq2 < Tq ≦ Tq3, the control module sets the initial frequency of the high frequency generator to a third initial frequency P3.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A HRB600 high-strength anti-seismic steel bar rolling process is characterized by comprising the following steps:
s1, the control module controls to convey the steel billet to the heating furnace through the conveying roller to be heated to a first preset temperature T1, and conveys the steel billet to the roughing mill to be roughly rolled when the heating is finished, so that roughly rolled round steel is obtained;
step S2, when rough rolling is completed, the obtaining module obtains the diameter D of the rough-rolled steel bar detected by the first laser diameter gauge, and when the rough-rolled steel bar is determined to be completed, the rough-rolled steel bar is cooled to a preset temperature range Ty through a water cooling tank;
step S3, the control module determines the roller spacing between a driving roller and a driven roller of a finishing mill roller according to the diameter D and conveys the rough rolled round steel subjected to temperature reduction to a finishing mill for finish rolling to obtain finish rolled ribbed round steel;
s4, conveying the finish-rolled ribbed round steel subjected to finish rolling to a shearing machine by a control module, shearing and naturally cooling to obtain the HRB600 high-strength anti-seismic steel bar;
in the step S3, the obtaining module obtains a pre-finish rolling temperature Tq of the rough rolled round steel detected by the first temperature sensor disposed above the conveying roller, obtains a finish rolling temperature Tz detected by the second temperature sensor disposed after the third finishing mill and a diameter Dj of the finish rolled round steel detected by the second laser diameter gauge when the finish rolled round steel exits the third finishing mill, and the control module analyzes and judges whether the finish rolled round steel is qualified or not according to the diameter Dj of the finish rolled round steel and adjusts parameters of the heating furnace, the rough rolling mill and the finishing mill according to an analysis result when the finish rolled round steel is unqualified;
in the step S3, when the control module determines the roller spacing between the driving roller and the driven roller of the front 3 finishing mill rollers according to the diameter D of the rough rolling round steel, the control module compares the diameter D of the rough rolling round steel with the preset diameter of the rough rolling round steel set therein, and determines the roller spacing of the finishing mill rollers according to the comparison result,
wherein the control module is provided with a first preset rough rolling round steel diameter D1, a second preset rough rolling round steel diameter D2, a third preset rough rolling round steel diameter D3, a first roller spacing H1, a second roller spacing H2 and a third roller spacing H3, wherein D1 is more than D2 and more than D3, H1 is more than H2 and more than H3,
when D is not more than D1, the control module determines that the roller spacing between the driving roller and the driven roller of the finishing mill roller is a first roller spacing H1;
when D1 is more than D and less than or equal to D2, the control module determines the roll spacing between the driving roll and the driven roll of the finishing mill roll to be a second roll spacing H2;
when D2 is larger than D and is not larger than D3, the control module determines the roll spacing between the driving roll and the driven roll of the finishing mill roll to be a third roll spacing H3;
in the step S3, when the rough rolled round steel is finish rolled, the control module analyzes and determines whether the finish rolled round steel is qualified according to the diameter Dj of the finish rolled round steel, the control module calculates the resilience W of the finish rolled round steel according to the diameter Dj of the finish rolled round steel and the roll inner diameter U of the 3 rd finishing mill, preliminarily determines whether the finish rolled round steel is qualified according to the comparison result between the resilience W and a preset resilience range W0, the preset resilience range W0 includes a preset minimum resilience Wmin and a preset maximum resilience Wmax,
if W belongs to W0, the control module preliminarily judges that the finish rolled round steel is qualified;
if W is larger than Wmax, the control module preliminarily judges that the finish rolling round steel is unqualified;
if W is less than Wmin, the control module judges that the finish rolling round steel is unqualified;
when the control module preliminarily judges that the finish rolling round steel is qualified, the control module obtains the elongation rate P of the finish rolling round steel finish rolled by the first three finish rolling mills, compares the elongation rate P with a preset elongation rate P0, and determines whether the finish rolling round steel is qualified according to the comparison result,
if the P is larger than or equal to P0, the control module judges that the finish rolling round steel is qualified;
if P is less than P0, the control module judges that the finish rolled round steel is unqualified;
when the control module preliminarily judges that the finish rolling round steel is unqualified, the control module calculates a first rebound quantity difference Wa between the rebound quantity W and a preset maximum rebound quantity Wmax, sets a range Wa = W-Wmax, selects a corresponding distance adjusting coefficient according to a comparison result of the rebound quantity difference and the preset rebound quantity difference to adjust the roller distance,
wherein the control module is further provided with a first preset spring-back difference W1, a second spring-back difference W2, a third spring-back difference W3, a first interval adjustment coefficient K1, a second interval adjustment coefficient K2 and a third interval adjustment coefficient K3, wherein the Δ W1 is less than the Δ W2 less than the Δ W3, 0.5 < K3 < K2 < K1 < 1 are set,
when the Wa is not more than W1, the control module selects a first interval adjustment coefficient K1 to adjust the interval between the rollers;
when the Δ W1 is less than or equal to the Wa is not more than W2, the control module selects a second distance adjusting coefficient K2 to adjust the distance between the rollers;
when the Δ W2 is less than or equal to the Δ W3, the control module selects a third spacing adjustment coefficient K3 to adjust the spacing between the rollers;
when the control module selects an ith interval adjusting coefficient Ki to adjust the roller interval, setting i =1, 2 and 3, and setting the adjusted roller interval as Hk, and setting Hk = Hn multiplied by Ki and n =1, 2 and 3;
when the control module judges that the finish rolling round steel is unqualified and W is less than Wmin, the control module calculates a second springback quantity difference value Wb between the springback quantity W and the preset minimum springback quantity Wmin, sets Wb = Wmin-W, selects a corresponding temperature adjusting coefficient according to a comparison result of the second springback quantity difference value and the preset springback quantity difference value to adjust a first preset temperature T1,
wherein the control module is also provided with a first temperature regulating coefficient Kt1, a second temperature regulating coefficient Kt2 and a third temperature regulating coefficient Kt3, Kt3 and Kt2 and Kt1 are set to be 0.5 and 2 respectively,
when the Δ Wb is not more than W1, the control module selects a first temperature adjustment coefficient Kt1 to adjust a first preset temperature T1;
when the Δ W1 is less than or equal to the Wb W2, the control module selects a second temperature adjustment coefficient Kt2 to adjust the first preset temperature T1;
when the Δ W2 is less than or equal to the Wb W3, the control module selects a third temperature adjustment coefficient Kt3 to adjust the first preset temperature T1;
when the control module selects an r-th temperature adjusting coefficient Ktr to adjust the first preset temperature T1, r =1, 2 and 3 are set, the control module sets the adjusted first preset temperature to be T2, and sets T2= T1 multiplied by Ktr;
when the control module judges that the finish rolling round steel is unqualified and P is less than P0, the control module calculates a finish rolling temperature difference Ta between the temperature Tq before finish rolling and the finish rolling temperature Tz detected by the second temperature sensor, sets Ta = Tq-Tz, determines whether to adjust the frequency of a high-frequency generator behind a third finishing mill according to the comparison result of the finish rolling temperature difference and a preset finish rolling temperature difference Ta0,
if Ta >, Ta0, the control module determines to adjust the frequency of the high-frequency generator;
if the Δ Ta is less than or equal to Ta0, the control module judges that the frequency of the high-frequency generator is not adjusted;
when the control module judges that the frequency of the high-frequency generator is adjusted, the control module calculates the elongation difference P between the elongation P and the preset elongation P0, sets the elongation P = P0-P, selects a corresponding frequency adjustment coefficient for adjustment according to the comparison result of the elongation difference and the preset elongation difference,
wherein the control module is further provided with a first preset elongation difference P1, a second preset elongation difference P2, a third preset elongation difference P3, a first frequency adjustment coefficient Kp1, a second frequency adjustment coefficient Kp2 and a third frequency adjustment coefficient Kp3, wherein the Δ P1 <. Δ P2 <. Δ P3, 1 < Kp1 < Kp2 < Kp3 < 1.5 are set,
when the Δ P is less than or equal to P1, the control module selects a first frequency adjustment coefficient Kp1 to adjust the frequency of the high-frequency generator;
when the Δ P1 is less than or equal to P2, the control module selects a second frequency adjusting coefficient Kp2 to adjust the frequency of the high-frequency generator;
when the Δ P2 is less than or equal to P3, the control module selects a third frequency adjusting coefficient Kp3 to adjust the frequency of the high-frequency generator;
when the control module selects an e-th frequency adjustment coefficient Kpe to adjust the frequency of the high-frequency generator, the control module sets the adjusted frequency of the high-frequency generator to be Pk, and sets Pk = Pm multiplied by Kpe and Pm is the initial frequency of the high-frequency generator;
when the control module finishes the frequency adjustment of the high-frequency generator, the control module selects a corresponding distance correction coefficient according to the comparison result of the elongation difference and a preset elongation difference to correct the roller distance,
wherein the control module is also provided with a first pitch correction coefficient X1, a second pitch correction coefficient X2 and a third pitch correction coefficient X3, wherein the setting is that X3 is more than 0.7 and X2 is more than X1 and less than 1,
when the Δ P is not more than P1, the control module selects a first interval correction coefficient X1 to correct the roller interval;
when the Δ P1 is less than or equal to P2, the control module selects a second pitch correction coefficient X2 to correct the roller pitch;
when the Δ P2 is less than or equal to P3, the control module selects a third pitch correction coefficient X3 to correct the roller pitch;
when the control module selects an s-th pitch correction coefficient Xs to correct the roll pitch, setting s =1, 2 and 3, and setting Hx = Hk × Xs by the control module after correction to be Hx;
in the step S3, the control module determines an initial frequency of the high-frequency generator based on a comparison of the pre-finish rolling temperature Tq and a preset pre-finish rolling temperature,
wherein the control module is also provided with a first preset temperature Tq1 before finish rolling, a second preset temperature Tq2 before finish rolling, a third preset temperature Tq3 before finish rolling, a first initial frequency P1, a second initial frequency P2 and a third initial frequency P3, wherein Tq1 is more than Tq2 and more than Tq3, P1 is more than P2 and more than P3,
when Tq is not greater than Tq1, the control module sets the initial frequency of the high-frequency generator to a first initial frequency P1;
when Tq1 < Tq ≦ Tq2, the control module sets the initial frequency of the high frequency generator to a second initial frequency P2;
when Tq2 < Tq ≦ Tq3, the control module sets the initial frequency of the high frequency generator to a third initial frequency P3.
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Denomination of invention: A Rolling Process for HRB600 High Strength Seismic Reinforcement Effective date of registration: 20231212 Granted publication date: 20220805 Pledgee: Bank of Xiamen Limited by Share Ltd. Zhangzhou branch Pledgor: FUJIAN SANBAO STEEL Co.,Ltd. Registration number: Y2023980071032 |
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