CN110538867A - Method for improving precision and yield of common bar deformed steel bar by cutting - Google Patents

Method for improving precision and yield of common bar deformed steel bar by cutting Download PDF

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Publication number
CN110538867A
CN110538867A CN201910583537.8A CN201910583537A CN110538867A CN 110538867 A CN110538867 A CN 110538867A CN 201910583537 A CN201910583537 A CN 201910583537A CN 110538867 A CN110538867 A CN 110538867A
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CN
China
Prior art keywords
rolling
burr
online
yield
last
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CN201910583537.8A
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Chinese (zh)
Inventor
蒲春雷
方实年
丁汉林
孙建国
龚俊健
张向军
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中冶华天工程技术有限公司
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Priority to CN201910583537.8A priority Critical patent/CN110538867A/en
Publication of CN110538867A publication Critical patent/CN110538867A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/16Metal-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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B15/00Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B38/00Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Abstract

The invention discloses a method for improving precision and yield of common-bar deformed steel bar cutting. The method comprises the following steps: obtaining the residual situation of burrs of each branching line based on a burr removal process database for splitting parallel rolled pieces; giving out an execution parameter of the burr removing device; processing the branched parallel rolled pieces according to execution parameters by a burr removing device, and measuring the processed parallel rolled pieces by a profile detector; comparing the measurement results with a predetermined processing range: if the size of the just processed deburring branching rolled piece is within a preset acceptable range, taking out a preset value of rolling mill rolling reduction from the online rolling process database and outputting the preset value to an online rolling adjustment system of the last rolling mill; if the rolling reduction is not in the preset range, the new rolling reduction of the last two rolling mills is given out after calculation and is output to an online rolling reduction adjusting system of the last rolling mill; and the online pressing adjustment system controls the final rolling mill to roll the rolled piece. The invention can eliminate the burrs generated by cutting rolled pieces as far as possible under the condition of reconstructing the existing rolling line as little as possible, and the conditions of low line difference precision and low yield are caused.

Description

Method for improving precision and yield of common bar deformed steel bar by cutting
Technical Field
The invention relates to the field of producing new national standard common bar deformed steel by a cutting method based on a deformation induction principle. In particular to a method for improving the precision and the yield of common bar deformed steel bar cutting.
Background
The threaded steel used as a base construction material comprises typical components of low-carbon steel and low-silicon-manganese alloy, in order to meet the national standard requirements in the traditional production method, on one hand, a strong water penetration process is adopted to form a strong and soft phase composite structure of tempered martensite, bainite, ferrite and pearlite to achieve mechanical properties, on the other hand, a cutting method is used to prepare a rolled piece to change the cross section appearance of the rolled piece from a circle to a rectangle before K6 and K5 are precut, K4 and K3 perform precut and cutting on the rectangular rolled piece with the cross section to form a parallel rolled piece, then the parallel rolled piece passes through a cutting wheel, 2-5 line separation is generally completed according to the specification requirements of the finished rolled piece, and the improvement of the full-line capacity is realized. As the final mechanical property index of the product is mainly realized by a strong water penetration and recovery method, the temperature of two rolling mills after the cut piece is put into the rolling mills can be higher (about 1000 ℃), the weight deviation of the original national standard small specification can reach +/-7 percent, the weight deviation basically falls into the rigidity range of the short stress path rolling mill, and the line difference control mainly caused by a cutting wheel is easier to meet.
however, in the implementation of the new national standard, the product performance is still achieved under the condition that a closed tempered martensite reverse-contrast ring is not formed, and the product performance is still met by fine ferrite and pearlite structures, most of the current steel enterprises are met by adding expensive micro-alloying elements such as V, Nb, Ti and the like, but on the one hand, the cost is obviously increased, and on the other hand, the potential of the low-carbon steel based on fine grains (ferrite + pearlite) is not fully excavated, and the steel is subjected to the chemical treatment by laboratories and pilot plants, and some high-level steel enterprises prove that the novel national standard performance requirements can be met by adopting a deformation induced precipitation (DIFT) combined with a segmentation process, micro-alloying elements are not used (or are reduced by 50%), meanwhile, the production line capacity is not influenced, however, due to the implementation requirement of DIFT and the improvement of the weight deviation of small and medium-sized products in the new national standard, the original cutting treatment is difficult to meet the requirement of line difference, and the product precision and the finished product rate are obviously influenced.
In summary, in order to perform a new national standard common bar deformed steel bar splitting process based on the DIFT method, ensure the mechanical property and the dimensional precision of a finished product, increase the stability of a production process and improve the yield, burrs of each rolling line caused by the fact that an original splitting wheel is split and connected with a rolled piece in parallel are removed as far as possible, and the last two rolling mills are pressed down and adjusted, so that the dimensional precision of the rolled piece is improved, and the comprehensive yield of the product is improved.
Disclosure of Invention
the invention aims at solving the problems that in the new national standard common bar deformed steel bar cutting process based on the DIFT method, after parallel rolled pieces are torn and separated by a cutting wheel, on one hand, residual small-size burrs at the joint part are quenched to form hard points through a K2 front water tank, the surface quality of the formed product is difficult to eliminate in the last two rolling passes to reduce the yield, on the other hand, the residual small-size burrs are easy to cause line difference and difficult to meet the precision requirement under the new national standard requirement,
In order to overcome the defects, the invention designs and provides a more advanced and reasonable burr cutting control method with simple operation and less investment so as to complete burr control before cutting into a water tank based on a DIFT condition, and a schematic diagram of the method is shown in FIG. 2.
In order to achieve the purpose, the method for improving the precision and the yield of the common-bar deformed steel bar by cutting comprises the following steps:
The burr removing process database based on the parallel rolled piece splitting obtains the residual situation of each branching burr,
Giving out an execution parameter of the burr removing device;
Processing the branched parallel rolled pieces according to the execution parameters by a burr removing device,
Measuring the processed parallel rolled pieces by using a profile detector;
Comparing the measurement results with a predetermined processing range:
If the size of the just processed deburring branching rolled piece is within a preset acceptable range, taking out a preset value of rolling mill rolling reduction from the online rolling process database and outputting the preset value to an online rolling adjustment system of the last rolling mill; if the rolling reduction is not in the preset range, the new rolling reduction of the last two rolling mills is given out after calculation and is output to an online rolling reduction adjusting system of the last rolling mill;
and the online pressing adjustment system controls the final rolling mill to roll the rolled piece.
Preferably, the burr removing device is an elliptical vertical guide wheel, and the execution parameters are rotating speed, rotating direction and rolling reduction.
Preferably, the burr removing device is a flame combustion small nozzle, and the execution parameters are combustion duration and combustion amount.
the invention provides a novel method for improving precision and yield of new national standard common bar deformed steel bar segmentation, which removes burrs at the edge of each line based on a preset burr removal process database based on parallel rolled piece segmentation, measures the size of each line based on an online profile detector, and performs reduction adjustment on two last rolling mills on the basis of comparing the actual size with the size of the rolled piece after burr treatment, so that the burrs generated by the segmented rolled piece can be eliminated as much as possible under the condition of reconstructing the existing rolled line as little as possible, and the conditions of low line difference precision and low yield are caused.
drawings
FIG. 1-a traditional hot-rolled twisted steel slitting production line arrangement
FIG. 1-b is a diagram of burrs on each line of a parallel rolled piece after segmentation, obtained by finite element simulation
FIG. 2-a is a schematic diagram of a water tank parameter online adjustment system based on the head-tail temperature difference of a rolled piece in the middle rod rolling process.
FIG. 2-b is a schematic diagram of a method for improving precision and yield of new national standard common bar deformed steel bar cutting
Detailed Description
The present invention will be further described with reference to the accompanying drawings and conventional technologies.
Before the new national standard, for a traditional hot-rolled twisted steel bar splitting production line, 18 frames are generally arranged, wherein 6 frames of a roughing mill group, 6 frames of a middle mill group and 6 frames of a finishing mill group are adopted. FIG. 1 is a conventional hot rolled twisted steel slitting line arrangement; wherein, 1: a heating furnace 2: a phosphorus remover 3: roughing train 4: flying shear 1# 5: and a middle binding machine set 6: flying shear 2# 7: finishing mill group 8: a slitting wheel 9: k2 (finished front frame) 10: cooling water tank 11 after rolling: and (5) cutting by multiple lengths.
in order to ensure the final finished product performance of a rolled piece, the arrangement of water tanks is generally carried out after 18 frames, namely a pre-finishing mill group is finished, the number of the water tanks is generally between 1-5 groups, and a composite phase structure of tempered martensite, bainite, ferrite and pearlite is formed on the cross section of a finished product through the rapid cooling of the surfaces of the rolled piece by the water tanks and the high-temperature return of the core part of the rolled piece, so that the mechanical property of the product is achieved. In order to increase the production capacity of the splitting process on a production line, a splitting wheel is usually added in front of a K2 rolling mill (No. 9) as shown in FIG. 1-a to realize 2-5 line splitting, but because parallel rolled pieces are not treated after being torn, the parallel rolled pieces usually remain after being split at the edge and the center rolled piece (as a and b in FIG. 1-b), and cannot be eliminated after entering a finished product front rack shown in K2 to be rolled (as c and d in FIG. 1-b), so that line difference is caused, and the product precision and the finished product yield are influenced.
the invention provides a production line arrangement and a schematic diagram for improving the precision and the yield of the new national standard common bar deformed steel bar by cutting, and the production line arrangement and the schematic diagram are shown in figure 2. In fig. 2, 1: a heating furnace 2: a phosphorus remover 3: roughing train 4: flying shear 1# 5: and a middle binding machine set 6: flying shear 2# 7: finishing mill group 8: a slitting wheel 9: cooling water tank (after 9-1 medium binding, 9-2K3, 9-3 finish rolling) 10: k2 (finished front chassis) 11: and (3) cutting by multiple length 12: burr removing devices 13: profile gauge
according to the DIFT process requirement, the deformation of not less than 35% of accumulated reduction rate at the austenite-ferrite critical temperature (about 750-825 ℃) is carried out on rolled pieces at the last two frames (K2, K1), therefore, a group of water tanks are respectively added in front of a medium rolling unit and a K2 rack, the water tanks behind the original finishing mill unit are only used for weak cooling, and the situation that a tempered martensite closed ring is not formed due to overhigh cooling speed of a surface structure is ensured. Compared with the prior art (figure 1-a), the torn rolled piece after the cutting wheel passes through the water tank, so that a hard point is formed due to rapid cooling when burrs are left on the surface, and the subsequent two-pass rolling of K2 and K1 is not facilitated. The invention adds a preset rolling process database based on a rolling program table, obtains the size of each line of the parallel rolled pieces after the processing of an information module, gives the parameter speed, the direction, the pressing down and the burning time length and the burning quantity of a flame burning device of a burr removing device, removes or reduces burrs, further obtains the size of each line of the rolled pieces based on an added on-line rolled piece profile instrument, transmits the size to the preset last two rolling mills to be processed by an on-line pressing process database, if the size of the processed deburring branching rolled piece still meets the requirement that the original reduction is within an acceptable range, taking out a preset value from the on-line rolling process database of the last two rolling mills, otherwise, if the preset value exceeds the preset range, calculating to obtain new rolling reduction of the last two rolling mills, the adjustment system is pressed down on line by the last two rolling mills for adjustment, and the requirement that the precision of each branched rolled piece after being discharged from the last two rolling mills reaches the new national standard is met. The information processing and the process parameters and the like related in the invention exist in a database form, so that the calculation time is saved, and the method is extremely suitable for online use. By the processing of the invention, the requirement of obviously improving the quality stability of finished products based on the reduction of burrs of each line under the lowest investment can be achieved only by a few temperature detection devices, electric control systems and databases on the premise of not increasing complex online contour detection devices and online rolling mill adjustment algorithms.

Claims (3)

1. A method for improving precision and yield of common bar deformed steel bar cutting is characterized in that,
The burr removing process database based on the parallel rolled piece splitting obtains the residual situation of each branching burr,
Giving out an execution parameter of the burr removing device;
processing the branched parallel rolled pieces according to the execution parameters by a burr removing device,
measuring the processed parallel rolled pieces by using a profile detector;
Comparing the measurement results with a predetermined processing range:
If the size of the just processed deburring branching rolled piece is within a preset acceptable range, taking out a preset value of rolling mill rolling reduction from the online rolling process database and outputting the preset value to an online rolling adjustment system of the last rolling mill; if the rolling reduction is not in the preset range, the new rolling reduction of the last two rolling mills is given out after calculation and is output to an online rolling reduction adjusting system of the last rolling mill;
and the online pressing adjustment system controls the final rolling mill to roll the rolled piece.
2. The method for improving the precision and the yield of the slitting of the common-rod deformed steel bars according to claim 1, wherein the burr removing device is an elliptical vertical guide wheel, and the execution parameters are rotating speed, rotating direction and rolling reduction.
3. the method for improving the precision and the yield of the segmentation of the common-rod deformed steel bar according to claim 1, wherein the burr removing device is a flame combustion small nozzle, and the execution parameters are combustion duration and combustion amount.
CN201910583537.8A 2019-06-28 2019-06-28 Method for improving precision and yield of common bar deformed steel bar by cutting CN110538867A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202606522U (en) * 2012-06-05 2012-12-19 新疆八一钢铁股份有限公司 Tensional guide for round steel bar slit rolling
CN202824170U (en) * 2012-07-03 2013-03-27 江苏永钢集团有限公司 Guide and protective device of club square type double-slitting-hole system
CN104874603A (en) * 2015-06-17 2015-09-02 中冶赛迪工程技术股份有限公司 High-yield high-quality bar rolling process system and method
CN104914810A (en) * 2015-04-10 2015-09-16 陈益民 Machined part deburring intelligent control system based on expert database
CN109909298A (en) * 2019-03-21 2019-06-21 中冶赛迪工程技术股份有限公司 The production method of excellent steel and screw-thread steel production line of bar and excellent steel and screw-thread steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202606522U (en) * 2012-06-05 2012-12-19 新疆八一钢铁股份有限公司 Tensional guide for round steel bar slit rolling
CN202824170U (en) * 2012-07-03 2013-03-27 江苏永钢集团有限公司 Guide and protective device of club square type double-slitting-hole system
CN104914810A (en) * 2015-04-10 2015-09-16 陈益民 Machined part deburring intelligent control system based on expert database
CN104874603A (en) * 2015-06-17 2015-09-02 中冶赛迪工程技术股份有限公司 High-yield high-quality bar rolling process system and method
CN109909298A (en) * 2019-03-21 2019-06-21 中冶赛迪工程技术股份有限公司 The production method of excellent steel and screw-thread steel production line of bar and excellent steel and screw-thread steel

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