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Rolling process method based on phi 55 mm and phi 75 mm round steel common pass schedule

A process method and pass technology, applied in the field of rolling process based on Ф55mm~Ф75mm round steel common pass system, can solve the problems of large number of spare parts for rolling mills and rolls, long time for changing specifications, frequent changing of specifications, etc., to reduce spare parts The effect of reducing the quantity, facilitating stable control, and shortening the time for replacing rolling mills

Active Publication Date: 2021-07-09
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The company adopts the mode of production based on sales, pricing and order, and agreement and contract to organize production, rather than mass production of a single specification. This production organization mode results in frequent specification changes, a large number of rolling mills and rolls in reserve, and a long time for specification replacement. Seriously affect production efficiency

Method used

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  • Rolling process method based on phi 55 mm and phi 75 mm round steel common pass schedule
  • Rolling process method based on phi 55 mm and phi 75 mm round steel common pass schedule
  • Rolling process method based on phi 55 mm and phi 75 mm round steel common pass schedule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0056] Production specification: Ф65mm round steel

[0057] Steel grade: 20

[0058] Rolling mills used: racks 1 to 10

[0059] Replacing specifications: changing from Ф55mm to Ф65mm round bar, removing the 11th and 12th rolling mills, and adjusting the roll gap of the 5th, 6th, 9th, and 10th stands, which took a total of 30 minutes.

[0060] Table 6 Ф65mm round steel rolling schedule

[0061] Rolling mill Hole type code Roll gap(mm) Red billet size (mm×mm) speed(m / s) 1 1 15.0 175×120 0.31 2 2 15.0 137.5×118 0.41 3 3 12.0 140×88 0.58 4 4 12.0 105×105 0.74 5 5 13.1 117.5×66 1.06 6 6 13.0 79×76 1.36 7 Empty 8 Empty 9 201 3.3 84.9×60.3 1.64 10 118 3.0 65.5×65.5 1.88

[0062] Production furnace number: 1009337, 1009338, 6011543, 2011620, 1009485, 2011756

[0063] Heating in the 160 billet heating furnace to the rolling start temperature of 1000°C-1030°C, entering the rou...

Embodiment 3

[0065] Production specification: Ф60 round steel

[0066] Steel grade: Q355B

[0067] Rolling mills used: racks 1 to 10

[0068] Table 7Ф60mm round bar rolling schedule

[0069] Rolling mill Hole type code Roll gap(mm) Red billet size (mm×mm) speed(m / s) 1 1 15.0 175×120 0.35 2 2 15.0 137.5×118 0.43 3 3 12.0 140×88 0.58 4 4 13.0 106×105 0.67 5 114 13.9 118.5×78.4 0.96 6 115 16.4 88.4×84 1.17 7 129 4.5 91.4×67 1.38 8 130 5.0 75.9×75.9 1.60 9 112 4.6 82.5×55.4 1.93 10 113 3.0 60.5×60.5 2.26

[0070] Production furnace number: 1007675, 3009799, 3009831, 3009827, 1007691

[0071] 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 rolling into the 7th to 10th stands of the middle rolling mill after the 1# pendulum shear head. The steel was rolled in 10 passes with 6 rough rollin...

Embodiment 4

[0073] Production specification: Ф75mm round steel

[0074] Steel grade: 20

[0075] Rolling mills used: racks 1 to 8

[0076] Replacing specifications: changing from Ф60mm to Ф75mm round bar, removing the 9th and 10th rolling mills, and adjusting the roll gap of the 5th, 6th, and 7th stands, which took a total of 25 minutes.

[0077] Table 8 Ф75mm round steel rolling schedule

[0078] Rolling mill Hole type code Roll gap(mm) Red billet size (mm×mm) speed(m / s) 1 1 15.0 175×120 0.31 2 2 15.0 137.5×118 0.41 3 3 12.0 140×88 0.54 4 4 13.0 106×105 0.68 5 114 15.5 118.5×80 0.83 6 115 18.0 90×84 1.00 7 129 7.0 98×69.5 1.20 8 130 5.0 75.9×75.9 1.42

[0079] Production furnace number: 3011768, 2011829, 1009562, 1009566, 3011834, 2011893

[0080] Heating in a 160 billet heating furnace to a rolling start temperature of 1000°C-1030°C, rolling into the first to sixth stands of the rough rolling mill, a...

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Abstract

The invention discloses a rolling process method based on a phi 55 mm and phi 75 mm round steel common pass schedule. The method comprises the following steps: designing the round steel of phi 55 mm-phi 75 mm into two sets of shared pass schedules by analyzing pass schedules and rolling process parameters; designing the specifications of phi 55mm and phi 65mm to be a set of shared pass schedule, and after adjustment, the system is shared by eight rolling mill passes and two secondary idle guide grooves; designing the specifications of phi 60mm and phi 75mm as a set of shared pass schedule, wherein the shared pass schedule is shared by eight rolling mills after adjustment; and moving the finished product rack with the specification of phi 60mm and phi 65mm forwards from the twelfth rolling mill to the tenth rolling mill, wherein 2-4 idle passing sorties of an intermediate rolling mill group are reduced. According to the invention, the specification is changed according to the principle of common hole schedule, so that the time for changing the rolling mill is effectively shortened, and the downtime for changing the specification each time is reduced by 84-120 minutes; quantities of standby rolling mills and rollers are reduced, and the labor intensity of workers and the production cost are reduced; and middle empty pass is reduced, the finished product pass is moved forwards to the tenth frame of the intermediate rolling mill set to discharge the finished product, so that the layout of the rolling mill is more compact, stable control of rolling tension is facilitated, control over the size precision of round steel is improved, and the quality of the round steel object is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of round steel production technology, and in particular relates to a rolling process method based on a Ф55mm-Ф75mm round steel common pass system. Background technique [0002] The original design products of the company's double bar production line are round steel and rebar. The round steel product design specifications are φ16mm-φ60mm. In order to meet the market demand for steel specifications for tube blanks, three super-design specifications of φ65mm, φ70mm and φ75mm have been independently developed. Hot rolled round steel products. The double-bar production line was completed and put into operation in 2006. In the early stage, it mainly produced rebar, which is a building material product. Since 2015, the product structure has been upgraded and transformed, and the main rebar product has been transformed into hot-rolled round bar. Combined with market demand and process equipment, it is positioned as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/18
CPCB21B1/18Y02P90/30
Inventor 刘桂华窦玮齐孝楠王会超刘宝超王佩鑫冯治胜王新奎
Owner TIANJIN IRON & STEEL GRP