CN104785520A - Method for controlling high speed wire rod surface clamp mark coarse grains - Google Patents
Method for controlling high speed wire rod surface clamp mark coarse grains Download PDFInfo
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- CN104785520A CN104785520A CN201510163126.5A CN201510163126A CN104785520A CN 104785520 A CN104785520 A CN 104785520A CN 201510163126 A CN201510163126 A CN 201510163126A CN 104785520 A CN104785520 A CN 104785520A
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- wire rod
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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
Abstract
The invention discloses a method for controlling high speed wire rod surface clamp mark coarse grains, and belongs to the technical field of steel rolling. According to technological steps and controlled technical parameters, the speed of an outlet of a finishing mill is controlled to range from 80 m/s to 86 m/s, the overstepping coefficient of a wire feeding machine is controlled to range from 1.01 to 1.03, five sections of water tanks are adopted for cooling after finish rolling is performed, the cooling temperature drop of the first three water tanks is controlled to range from 40 DEG C to 50 DEG C, the shaking amplitude of a wire rod in the cooling process is controlled to range 10 mm to 25 mm, the tail clamping pressure is controlled to range from 0.20 Mpa to 0.24 Mpa, the closed degree is controlled to range from 0.55 mm to 0.65 mm, and the wire feeding temperature is controlled to range from 880 DEG C to 900 DEG C. By optimizing technological parameters in the rolling process, on the technological condition that tail clamping and feeding are adopted in the whole rolling process, rolling and wire feeding of the wire rod can be effectively controlled and stabilized, and control over the high speed wire rod surface clamp mark coarse grains is achieved; on the one hand, the wire rod surface quality is improved; on the other hand, control over structure uniformity is achieved, and the product performance is optimized; the method is quite suitable for optimizing the wire rod structure performance and improving the product quality in a high speed wire rod factory.
Description
Technical field
The invention belongs to technical field of steel rolling, in particular, provide a kind of hot-rolling method controlling high speed wire bar surface catcher mark open grain structure, be applicable to the production technology that high-speed wire factory optimizes wire rod product quality, improve comprehensive mechanical property and surface quality, the dimensional accuracy of wire rod.
Background technology
The emphasis of quality control on the surface, dimensional accuracy and structure property Shi Gao line factory concern always.Especially increase in current deep processing industry drawing deformation amount, drawing speed improves, silk heat treatment in deduction and exemption, steel wire wire broken rate be when requiring strict, how to realize wire surface quality and structure property promotes the main aspect becoming steel rolling process research further.
The catcher mark on high speed wire bar surface is the one of Defects in Wire Rod, symmetrically occur on surface, show as facet catcher mark parallel up and down, as illustrated in fig. 1 and 2, often occur at the afterbody of the wire rod of steel mill's production, its Producing reason is that pinch roll hole type design is improper and grasping force control is improper, causes the micro-plastic deformation that pinch roll applies to wire rod surface.Therefore, the technology controlling and process for pinch roll is extremely important with design.Controlling Technology for pinch roll must be applicable to the rolling mill practice of whole piece height line and variety characteristic, specification restriction.Mainly control from the following aspects: first ensure the stable of the operation of rolling, ensure that the mistake of wire rod afterbody after going out finishing mill can stablize the guide and guard before entering pinch roll accurately under opening state, ensure that pinch roll gives enough clampings and reduction of speed; Secondly, ensure that clamping process can either ensure to lose a state lower tail under the frictional force effect of pinch roll, guarantee and Laying head form stable state of weaving silk, and ensure that pinching process can not cause chucking power excessive, causes surface to occur catcher mark again.This not only will carry out accurate technology controlling and process to the operation of rolling, and will analyse in depth cooling procedure, and as everyone knows, the Quench of high line water tank can cause the vibrations of wire rod, has a strong impact on the stability of pinch roll clamping process.Surface catcher mark coarse-grain is the open grain structure passing through the abnormal grain growth generation that journey catcher mark micro-plastic deformation produces along with clip surface, is a kind of abnormal structure, but is different from traditional Wei Shi open grain structure completely.
At low-carbon cold heading steel wire rod development field, numerous scientific research personnel's effects on surface open grain structure is analyzed and researched, find that the open grain structure of low-carbon cold heading steel is often attended by Widmannstatten structure, the open grain structure of low-carbon cold heading steel is exactly surperficial Widmannstatten structure in other words, the cooldown rate after " analysis of SWRCH22A Cold Heading Steel Wire drawing fracture " middle proposition control wire rod is weaved silk such as Ai Xinghui, reduces the probability that Widmannstatten structure occurs; Liao Linlin proposes to conduct in-depth analysis to 22A open grain structure in " exploitation of cold-forging steel SWRCH22A rolling mill practice ", propose by the method optimizing heating furnace technique, rolling mill practice, cooling control technology come coarse grains on surface and Widmannstatten structure always, in rolling mill practice, wherein propose Low Temperature Finish and the thinking controlling roll gap, drafts, but do not have to propose the concrete technological parameter solved; Cheng Fang has carried out analyzing targetedly to mixed crystal and coarse-grain in " large link rod die joint mixed crystal and coarse-grain Widmannstatten structure ", propose the concept of critical reduction, the basic reason that coarse-grain produces is summed up in the point that the hereditation of thick deformed austeaite, and the cross section deformation that specific pass causes is uneven; And the people such as Song Zhuofei are by the method for simulation, propose in roll and the red base operation of rolling in " finite element modelling of the oval circular hole Strain Distribution of During Hot Bar Rolling ", because collars is to red base chilling action, rigid-plastic interface and rigid deformation district is formed on surface, illustrate that surperficial deformation quantity is not the region that in cross section, deflection is maximum, fundamentally change the understanding that traditional view effects on surface deformation quantity is greater than heart portion, and support the viewpoint that open grain structure is thick austenite crystal genetic organization.
By a large amount of experiments and analysis, collars is to red base surface chill, cause surface temperature in the operation of rolling extremely low, form rigid-plastic interface and rigid deformation district, inhibit the infiltration of rolling deformation on the one hand, cause the accumulation of surface deformation amount inadequate, the structure refinement effect of dynamic recrystallization and meta-dynamic recrystallization can not be ensured, on the other hand, temperature return process between passage, red base heart portion heat is caused outwards to conduct, the rigid-plastic interface on surface and rigid deformation district temperature raise, thus Static Recrystallization is there is between rolling pass, this Static Recrystallization directly causes the austenite crystal generation abnormal growth of specific orientation, cause coarse grains on surface, as the tissue morphology of the near surface of blank in the middle of Fig. 2.
Innovative point of the present invention is, analysing in depth high speed wire bar surface catcher mark coarse-grain Producing reason, closely in conjunction with high-speed wire mill feature, propose wire rod catcher mark coarse-grain control method, specify that the control surface catcher mark of Gao Xian factory exploitation wire rod process and the key operation main points of open grain structure.
Summary of the invention
The object of the present invention is to provide a kind of method controlling wire rod clip surface trace coarse-grain, the technical parameter of processing step of the present invention and control is:
1, finishing mill outlet speeds control is at 80-86m/s, and Laying head overstepping coefficient controls at 1.01-1.03;
This research flies in domestic Kazakhstan to be employed when 10 frame rolling finishing mills produce the wire rod of 5.5-6.5mm, for the wire rod of this specification, the setting of finish rolling speed and Laying head overstepping coefficient, on the one hand according to the degree of stability of wire rod in the operation of rolling, the rolling speed of finishing mill is excessively slow, be not suitable for the coupling of current high line production capacity, extend rolling time, add the uniformity of head and tail temperature, thus the reasonability of structure property and size end to end can not be ensured, experiment shows, 5.5-6.5mm specification wire rod rolling time often extends 10s, the difference of head and tail temperature will increase by 2 DEG C, afterbody occurs that the probability of the ears or side handles of a utensil will increase.Finish rolling speed is too fast, and the vibrations of finishing mill can be caused to strengthen, and what wire rod went out Laying head there will be vibrations, thus affects its stability of weaving silk, and brings very large difficulty to the clamping of pinch roll.The coupling of Laying head overstepping coefficient and finish rolling speed also will ensure that afterbody can be good at reduction of speed and weaves silk normally to a great extent on the other hand.When normal tandem rolling state, Laying head ensures finish rolling by rational overstepping coefficient and the coupling of tension force between weaving silk, and ensureing weaves silk carries out smoothly, general tension force less than 1.06, when ensureing that wire rod is not pulled off, tension force is larger, and the operation of rolling is more smooth and easy.But under state is opened in the mistake that wire rod afterbody has gone out finishing mill, the overstepping coefficient of Laying head has set and performed, under the state of tension that it is powerful, wire rod is accelerated after losing.Afterbody adds and send the setting of roller will ensure afterbody reduction of speed under the effect of chucking power exactly, thus ensures the normal of the constant and afterbody cast of toast speed.So require under this state that the overstepping coefficient of Laying head can not be too large, after experiment proves overstepping coefficient > 1.04, difficulty can be brought to the clamping of pinch roll and reduction of speed effect, the method increasing chucking power can only be taked to ensure normally weaving silk of afterbody.For ensureing that afterbody does not occur catcher mark, the contrast of its setting parameter is as shown in table 1.
The contrast of table 1 overstepping coefficient, speed of weaving silk, chucking power size
| To weave silk speed | 80m/s | 85m/s | 90m/s | 95m/s |
| Overstepping coefficient | 1.04 | 1.03 | 1.02 | 1.01 |
| Chucking power | 0.3Mpa | 0.24Mpa | 0.20Mpa | 0.18Mpa |
2, adopt 5 sections of water tank coolings after finish rolling, first three water tank cooling temperature drop controls at 40-50 DEG C, and the shake amplitude controlling of cooling procedure wire rod is at 10-25mm;
Cooling after finishing mill adopts 5 sections of water tank coolings, the length of every section of water tank is 6m, recovery segment length between each water tank is on average at 7m, maximum advantage ensures every section of rational temperature drop of water tank exactly, good temperature can be obtained after in turn ensure that cooling reply, the intensity of cooling of every section is set simultaneously, control at 40-50 DEG C, experiment surface is after intensity of cooling is more than 60 DEG C, not only there is overquenching tissue in wire surface, and the stronger cooling of water tank can bring the strenuous vibration of wire rod, after amplitude is more than 30mm, wire rod enters pinch roll with regard to very difficult stable, thus also just cannot ensure that pinch roll clamps normally, reduction of speed, reduction of speed effect can only be ensured by increasing chucking power.
Wire rod amplitude under the different intensity of cooling of table 2
3, afterbody clamp pressure controls at 0.20-0.24Mpa, and degree of remaining silent controls at 0.55-0.65mm; Laying temperature controls at 880-900 DEG C.
Afterbody chucking power is the key factor affecting wire rod reduction of speed effect and surperficial catcher mark coarse-grain.Be experimental studies have found that by a large amount of, chucking power is larger, and surface occurs that the tendentiousness of catcher mark is stronger.But the relation between the coarse-grain of catcher mark position and chucking power, is realized by clamping deflection.Clamping can form micro-plastic deformation locally by effects on surface, classical recrystallization theoretical surface deformation meeting crystal grain thinning, but micro-plastic deformation or rigid-plastic distortion, not only can not occurrence dynamics recrystallization softening crystal grain, and can cause deuterogenesis's Static Recrystallization or tissue that the abnormal growth of specific orientation occurs, the facet coarse-grain near Fig. 1 and 2 catcher mark is exactly good evidence.The setting of opening degree mainly in order to ensure that the head of rolled piece can enter pinch roll smoothly, so the opening degree of pinch roll is relevant with rolling specs with the clip slot size of pinch roll.Opening degree is too large, and workpiece front end can push up pinch rolls outlet guide and guard to be caused piling steel; Opening degree is too little, and workpiece front end can push up pinch roll, and causes piling steel.For ensureing effectively to clamp, degree of the remaining silent setting of pinch roll ensure that pinch roll is as far as possible little when not pasting roller, generally just can well realize this function at 0.55-0.65mm, and degree of remaining silent also is affect pinch roll to ensure the parameter that wire rod applies frictional force, degree of remaining silent is too large, and pinch roll just can not implement effectively clamping to wire rod, and degree of remaining silent is too little, the chucking power on surface will be increased, thus occur catcher mark coarse-grain.
The relation of table 3 chucking power, Light deformation amount and catcher mark coarse-grain
| Chucking power | 0.35Mpa | 0.30Mpa | 0.24Mpa | 0.20Mpa | 0.18Mp |
| Light deformation amount | 7％ | 5％ | 3％ | 2％ | 1％ |
| Coarse-grain probability | 80％ | 70％ | 20％ | 10％ | 10％ |
The invention has the advantages that, by optimizing the technological parameter of the operation of rolling, under the process conditions that operation of rolling whole process adopts afterbody to pinch, not only can effectively control the rolling of stable wire rod and weave silk, and realize controlling the control of high speed wire bar surface catcher mark coarse-grain, improve wire rod surface quality on the one hand, achieve structural homogenity on the other hand and control, optimize the performance of product.Be applicable to very much Gao Xian factory and carry out the optimization of wire rod structure property and the lifting of product quality.
Accompanying drawing explanation
Fig. 1 is high line 6.5mm wire rod M6 surface catcher mark and coarse-grain.
Fig. 2 is high line 6.5mm wire rod 22A surface catcher mark and coarse-grain.
Fig. 3 is high line 5.5mm wire rod bonding wire ER50s-6 surface catcher mark and coarse-grain.
Fig. 4 is surperficial catcher mark and the coarse-grain of high line 6.5mm wire rod 45# steel.
Detailed description of the invention
Embodiment 1
Be applied in the cold-forging steel M6 wire rod of Shoudu Iron and Steel Co exploitation specification 6.5mm, concrete steps are:
A () wire rod rolling specs is 6.5mm, finishing mill outlet speeds control is at 80m/s, and Laying head overstepping coefficient controls 1.03;
B adopt 5 sections of water tank coolings after () finish rolling, first three water tank cooling temperature drop controls at 40 DEG C, the maximal jitter amplitude 20mm of cooling procedure wire rod;
C () afterbody clamp pressure controls at 0.24Mpa;
Embodiment 2
Be applied in the bonding wire wire rod of Shoudu Iron and Steel Co exploitation specification 5.5mm, concrete steps are:
A () wire rod rolling specs is 5.5mm, finishing mill outlet speeds control is at 86m/s, and Laying head overstepping coefficient controls 1.01;
B adopt 5 sections of water tank coolings after () finish rolling, first three water tank cooling temperature drop controls at 50 DEG C, and the shake amplitude controlling of cooling procedure wire rod is at 25mm;
C () afterbody clamp pressure controls at 0.20Mpa.
Claims (1)
1. control the method for high speed wire bar surface catcher mark coarse-grain, it is characterized in that, the technical parameter of processing step and control is:
A () wire rod rolling specs is 5.5-6.5mm, finishing mill outlet speeds control is at 80-86m/s, and Laying head overstepping coefficient controls at 1.01-1.03;
B adopt 5 sections of water tank coolings after () finish rolling, first three water tank cooling temperature drop controls at 40-50 DEG C, and the shake amplitude controlling of cooling procedure wire rod is at 10-25mm;
C () afterbody clamp pressure controls at 0.20-0.24Mpa; Degree of remaining silent controls at 0.55-0.65mm; Laying temperature controls at 880-900 DEG C.
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| CN201510163126.5A CN104785520B (en) | 2015-04-08 | 2015-04-08 | A kind of method controlling high speed wire bar surface catcher mark coarse-grain |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588842A (en) * | 2020-11-06 | 2021-04-02 | 邢台钢铁有限责任公司 | Production method of boron-containing steel wire |
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| JPS5039066B1 (en) * | 1970-07-10 | 1975-12-13 | ||
| CN102259112A (en) * | 2011-04-12 | 2011-11-30 | 首钢总公司 | Method for controlling structural homogeneity of high-carbon steel coil rod for deep drawing of steel wire |
| CN102671938A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | High speed production method for controlling banded structure of low carbon steel wire rod |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5039066B1 (en) * | 1970-07-10 | 1975-12-13 | ||
| US3766763A (en) * | 1971-01-13 | 1973-10-23 | Southwire Co | Continuous rolled rod direct cooling method and apparatus |
| JPS5039066A (en) * | 1973-08-08 | 1975-04-10 | ||
| CN102259112A (en) * | 2011-04-12 | 2011-11-30 | 首钢总公司 | Method for controlling structural homogeneity of high-carbon steel coil rod for deep drawing of steel wire |
| CN102671938A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | High speed production method for controlling banded structure of low carbon steel wire rod |
Non-Patent Citations (2)
| Title |
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| 彭肖和: "Φ5.5mm线材轧制工艺的设定", 《冶金丛刊》 * |
| 陈鹤飞等: "德马克型吐丝机甩尾问题的分析和处理方法", 《冶金丛刊》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588842A (en) * | 2020-11-06 | 2021-04-02 | 邢台钢铁有限责任公司 | Production method of boron-containing steel wire |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |