Process method for rapid replacement of round steel rolling specifications based on double bar production line

Abstract

The invention discloses a process method for quickly changing the rolling specifications of round steel based on a double-bar production line; The specifications are designed as three pass series of the same family, and the rolling mills with the same pass code are set up for use in fixed racks. The replacement specifications follow the principle of the same family pass series and the fixed rolling mill racks with the same pass code. The interval design is 3 replacement series of the same family pass, which reduces the number of replacement rolling mills and empty guide grooves, effectively shortens the time for replacing rolling mills, and increases the production operation rate to 89%. Move the Ф24mm‑Ф42mm finished racks forward to the 12th or 14th racks of the intermediate rolling mills, reducing the number of idle racks between the intermediate rolling mills and the finishing mills. Steel process failure rate; solve the problem of large temperature drop from the intermediate rolling unit to the finishing rolling unit, stabilize the rolling tension, improve the control of the dimensional accuracy of the round steel passability, and the pass rate is increased to more than 99.92%.

Description

technical field

[0001] The invention belongs to the field of round steel production, and in particular relates to a process method for quickly changing round steel rolling specifications based on a double-bar production line. Background technique

[0002] The company's existing double-bar production line has introduced foreign advanced equipment and technology. Each production line is equipped with 18 rolling mills, which are arranged alternately horizontally and vertically, and continuous rolling without twisting. It was completed and put into operation in 2006. The highest rolling speed is 18 m / s; the raw material specifications are 160×160×12000mm, 150×150×12000mm; the product structure is Ф12-Ф50mm threaded steel bar and Ф16-Ф60mm round steel, and the length is 6-18m. From 2007 to 2014, the two bar lines mainly produced export high-strength ribbed steel bars and national standard rebars. In 2015, they began structural transformation to produce round steel products. Roun...

Examples

Embodiment 1

[0035] Production specification: Ф25 round steel

[0036] Steel grade: Q235B

[0037] Rolling mills used: stands 1 to 14

[0038] Table 4 Ф25mm round bar rolling schedule

[0039]

[0040] Production furnace number: 2013680, 2013683, 2013684, 2013685, 2013687

[0041] Heating in a 160 billet heating furnace to a rolling start temperature of 1000°C-1020°C, rolling into the 1st to 6th stands of the rough rolling mill, and entering the 7th to 14th stands of the middle rolling mill for rolling after the 1# pendulum shear head. The rolling operation of the rough rolling and intermediate rolling mills was stable, and there was no fluctuation in rolling tension and shaking of the rolled piece; the finished product was produced from the 14th stand, and the diameter and out-of-roundness of the round steel were measured by the caliper gauge, and the 3# combined shearing and shearing was carried out. Cut into 10 double-length pieces, put the double-length pieces on the cooling bed ...

Embodiment 2

[0043] Production specification: Ф30 round steel

[0044] Steel grade: 45

[0045] Rolling mills used: stands 1 to 14

[0046] Table 5 Ф30mm round bar rolling schedule

[0047]

[0048] Production furnace number: 2904208, 1903509, 1903509, 1903503, 1903503

[0049] Heating in a 160 billet heating furnace to the starting rolling temperature of 1040°C-1060°C, rolling into the 1st to 6th stands of the rough rolling mill, and entering the 7th to 14th stands of the middle rolling mill for rolling after the 1# pendulum shear head. The rolling operation of the rough rolling and intermediate rolling mills was stable, and there was no fluctuation in rolling tension and shaking of the rolled piece; the finished product was produced from the 14th stand, and the diameter and out-of-roundness of the round steel were measured by the caliper gauge, and the 3# combined shearing and shearing was carried out. Cut into 6 double-length pieces, put the double-length pieces on the cooling bed...

Embodiment 3

[0051] Production specification: Ф40 round steel

[0052] Steel grade: Q345B

[0053] Rolling mills used: racks 1 to 12

[0054] Table 6 Ф40mm round bar rolling schedule

[0055]

[0056]

[0057] Production furnace number: 3905344, 2904533, 3905341

[0058] Heating in a 160 billet heating furnace to a rolling start temperature of 1050°C-1070°C, rolling into the 1st to 6th stands of the rough rolling mill, and entering the 7th to 12th stands of the middle rolling mill for rolling after the 1# pendulum shear head. The rolling operation of the steel in the rough rolling and intermediate rolling units was stable, and there was no rolling tension fluctuation and rolled piece shaking; the finished product was produced from the 12th stand, and the diameter and out-of-roundness of the round steel were measured by the caliper gauge, and the 3# combined shearing and shearing Cut into 4 double lengths, the double lengths are placed on the cooling bed for natural cooling, the st...

technical field

[0001] The invention belongs to the field of round steel production, and in particular relates to a process method for quickly changing round steel rolling specifications based on a double-bar production line. Background technique

[0002] The company's existing double-bar production line has introduced foreign advanced equipment and technology. Each production line is equipped with 18 rolling mills, which are arranged alternately horizontally and vertically, and continuous rolling without twisting. It was completed and put into operation in 2006. The highest rolling speed is 18 m / s; the raw material specifications are 160×160×12000mm, 150×150×12000mm; the product structure is Ф12-Ф50mm threaded steel bar and Ф16-Ф60mm round steel, and the length is 6-18m. From 2007 to 2014, the two bar lines mainly produced export high-strength ribbed steel bars and national standard rebars. In 2015, they began structural transformation to produce round steel products. Roun...

Examples

Embodiment 1

[0035] Production specification: Ф25 round steel

[0036] Steel grade: Q235B

[0037] Rolling mills used: stands 1 to 14

[0038] Table 4 Ф25mm round bar rolling schedule

[0039]

[0040] Production furnace number: 2013680, 2013683, 2013684, 2013685, 2013687

[0041] Heating in a 160 billet heating furnace to a rolling start temperature of 1000°C-1020°C, rolling into the 1st to 6th stands of the rough rolling mill, and entering the 7th to 14th stands of the middle rolling mill for rolling after the 1# pendulum shear head. The rolling operation of the rough rolling and intermediate rolling mills was stable, and there was no fluctuation in rolling tension and shaking of the rolled piece; the finished product was produced from the 14th stand, and the diameter and out-of-roundness of the round steel were measured by the caliper gauge, and the 3# combined shearing and shearing was carried out. Cut into 10 double-length pieces, put the double-length pieces on the cooling bed ...

Embodiment 2

[0043] Production specification: Ф30 round steel

[0044] Steel grade: 45

[0045] Rolling mills used: stands 1 to 14

[0046] Table 5 Ф30mm round bar rolling schedule

[0047]

[0048] Production furnace number: 2904208, 1903509, 1903509, 1903503, 1903503

[0049] Heating in a 160 billet heating furnace to the starting rolling temperature of 1040°C-1060°C, rolling into the 1st to 6th stands of the rough rolling mill, and entering the 7th to 14th stands of the middle rolling mill for rolling after the 1# pendulum shear head. The rolling operation of the rough rolling and intermediate rolling mills was stable, and there was no fluctuation in rolling tension and shaking of the rolled piece; the finished product was produced from the 14th stand, and the diameter and out-of-roundness of the round steel were measured by the caliper gauge, and the 3# combined shearing and shearing was carried out. Cut into 6 double-length pieces, put the double-length pieces on the cooling bed...

Embodiment 3

[0051] Production specification: Ф40 round steel

[0052] Steel grade: Q345B

[0053] Rolling mills used: racks 1 to 12

[0054] Table 6 Ф40mm round bar rolling schedule

[0055]

[0056]

[0057] Production furnace number: 3905344, 2904533, 3905341

[0058] Heating in a 160 billet heating furnace to a rolling start temperature of 1050°C-1070°C, rolling into the 1st to 6th stands of the rough rolling mill, and entering the 7th to 12th stands of the middle rolling mill for rolling after the 1# pendulum shear head. The rolling operation of the steel in the rough rolling and intermediate rolling units was stable, and there was no rolling tension fluctuation and rolled piece shaking; the finished product was produced from the 12th stand, and the diameter and out-of-roundness of the round steel were measured by the caliper gauge, and the 3# combined shearing and shearing Cut into 4 double lengths, the double lengths are placed on the cooling bed for natural cooling, the st...

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