CN104785520B - A kind of method controlling high speed wire bar surface catcher mark coarse-grain - Google Patents
A kind of method controlling high speed wire bar surface catcher mark coarse-grain Download PDFInfo
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- CN104785520B CN104785520B CN201510163126.5A CN201510163126A CN104785520B CN 104785520 B CN104785520 B CN 104785520B CN 201510163126 A CN201510163126 A CN 201510163126A CN 104785520 B CN104785520 B CN 104785520B
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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
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Abstract
A kind of method controlling high speed wire bar surface catcher mark coarse-grain, belongs to technical field of steel rolling.The technical parameter of processing step and control is: finishing mill outlet speeds control controls 1.01 1.03 at 80 86m/s, Laying head overstepping coefficient；Using 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；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.By optimizing the technological parameter of the operation of rolling, under the process conditions that operation of rolling whole process uses afterbody to pinch, it is possible not only to effectively control the rolling of stable wire rod and weave silk, and realize the control to high speed wire bar surface catcher mark coarse-grain and control, on the one hand wire rod surface quality is improved, on the other hand achieve structural homogenity control, optimize the performance of product.It is especially suitable for Gao Xian factory and carries out the optimization of wire rod structure property and the lifting of product quality.
Description
Technical field
The invention belongs to technical field of steel rolling, in particular, provide a kind of high speed wire bar surface catcher mark open grain structure of controlling
Hot-rolling method, it is adaptable to high-speed wire factory optimize wire rod product quality production technology, improve wire rod comprehensive mechanical property and
Surface quality, dimensional accuracy.
Background technology
Quality control on the surface, dimensional accuracy and structure property are always the emphasis that Gao Xian factory pays close attention to.Especially the deepest
In the increase of processing industry drawing deformation amount, drawing speed raising, deduction and exemption, silk is heat-treated, steel wire wire broken rate requires strict situation
Under, 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 occurs on surface, shows as the most parallel
Facet catcher mark, as illustrated in fig. 1 and 2, the afterbody at the wire rod of steel mill's production often occurs, its Producing reason is to pinch roller aperture
Type design is improper and grasping force control is improper, causes the micro-plastic deformation that pinch roll applies to wire rod surface.Therefore, for folder
Technology controlling and process and the design of sending roller are extremely important.For pinch roll control technique must be appropriate for whole piece height line rolling mill practice and
Variety characteristic, specification limit.Main from the following aspects control: first to ensure stablizing of the operation of rolling, it is ensured that wire rod afterbody
Can stablize under mistake state after going out finishing mill and enter the guide and guard before pinch roll accurately, it is ensured that pinch roll is given enough
Clamping and reduction of speed；Secondly, it is ensured that clamping process can either ensure to lose a state lower tail under the frictional force effect of pinch roll,
Ensure and Laying head forms stable state of weaving silk, ensure that the process that pinches does not results in chucking power again excessive, cause surface to go out
Existing catcher mark.This not only to carry out accurate technology controlling and process to the operation of rolling, and to analyse in depth cooling procedure, many institutes
Known, 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 is thick
Crystalline substance is accompanied by clip surface and passes through the open grain structure of the abnormal grain growth generation that journey catcher mark micro-plastic deformation produces, and is a kind of different
Often tissue, but it is totally different from traditional Wei Shi open grain structure.
At low-carbon cold heading steel wire rod development field, coarse grains on surface tissue is analyzed and researched by numerous scientific research personnel, sends out
The open grain structure of existing low-carbon cold heading steel is often attended by Widmannstatten structure, and the open grain structure of low-carbon cold heading steel is exactly surface Wei in other words
Family name organizes, and Ai Xinghui etc. proposes the cooling speed controlled after wire rod is weaved silk in " analysis of SWRCH22A Cold Heading Steel Wire drawing fracture "
Rate, reduces the probability that Widmannstatten structure occurs；Liao Linlin proposes 22A in " exploitation of cold-forging steel SWRCH22A rolling mill practice "
Open grain structure conducts in-depth analysis, and proposes to suppress coarse grains on surface by optimization heating furnace technique, rolling mill practice, the cold technique of control
With the method for Widmannstatten structure, in rolling mill practice, wherein propose Low Temperature Finish and control roll gap, the thinking of drafts, but not carrying
Go out the technological parameter of concrete solution；Mixed crystal and coarse-grain are carried out by Cheng Fang in " large link rod die joint mixed crystal and coarse-grain Widmannstatten structure "
Analyze targetedly, it is proposed that the concept of critical reduction, the basic reason that coarse-grain produces is summed up in the point that thick deformation
The hereditation of austenite, and the cross section deformation that specific pass causes is uneven；And Song Zhuofei et al. is by the side of simulation
Method, proposes 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 ",
Owing to collars is to red base chilling action, forms rigid-plastic interface and rigid deformation district on surface, the deformation quantity on surface is described also
It not the region that in cross section, deflection is maximum, fundamentally changes traditional view and surface deformation amount is more than the understanding in heart portion,
And support the viewpoint that open grain structure is thick austenite crystal genetic organization.
By substantial amounts of experiment and analysis, collars, to red base surface chill, causes surface temperature pole in the operation of rolling
Low, form rigid-plastic interface and rigid deformation district, on the one hand inhibit the infiltration of rolling deformation, cause the long-pending of surface deformation amount
Tired inadequate, it is impossible to ensureing dynamic recrystallization and the structure refinement effect of meta-dynamic recrystallization, on the other hand, the temperature between passage is extensive
Multiple process, causes red base heart portion heat outwards to conduct, and the rigid-plastic interface on surface and rigid deformation district temperature raise, thus
Static Recrystallization occurs between rolling pass, and this Static Recrystallization directly results in the austenite crystal of specific orientation and occurs abnormal long
Greatly, cause coarse grains on surface, such as the tissue morphology of the near surface of blank in the middle of Fig. 2.
The innovative point of the present invention is, is analysing in depth high speed wire bar surface catcher mark coarse-grain Producing reason, is closely tying
Close high-speed wire mill feature, it is proposed that wire rod catcher mark coarse-grain control method, specify that the control surface of Gao Xian factory exploitation wire rod process
The key operation main points of catcher mark and open grain structure.
Summary of the invention
It is an object of the invention to provide a kind of method controlling wire rod surface catcher mark coarse-grain, the process step of the invention and
The technical parameter controlled is:
1, finishing mill outlet speeds control controls at 1.01-1.03 at 80-86m/s, Laying head overstepping coefficient；
This research is employed when domestic Kazakhstan flies the wire rod producing 5.5-6.5mm on 10 frame rolling finishing mills, advises for this
The wire rod of lattice, finish rolling speed and the setting of Laying head overstepping coefficient, on the one hand foundation wire rod is in the degree of stability of the operation of rolling, essence
The rolling speed of milling train is the slowest, is not suitable for the coupling of current high line production capacity, extends rolling time, add the equal of head and tail temperature
Even property, thus it cannot be guaranteed that structure property and the reasonability of size end to end, experiment shows, during the rolling of 5.5-6.5mm specification wire rod
Between often extend 10s, the difference of head and tail temperature will increase by 2 DEG C, and afterbody occurs that the probability of the ears or side handles of a utensil will increase.Finish rolling speed mistake
Hurry up, the vibrations of finishing mill can be caused to strengthen, wire rod goes out the vibrations that there will be of Laying head, thus affects its stability weaved silk, and gives
The clamping of pinch roll brings the biggest difficulty.On the other hand the coupling of Laying head overstepping coefficient and finish rolling speed is largely also
Afterbody to be ensured can be good at reduction of speed and weaves silk normally.When normal tandem rolling state, Laying head is by the most advanced system
The coupling of the tension force between counting guarantee finish rolling and weaving silk, it is ensured that weave silk and carry out smoothly, general tension force less than 1.06, ensureing line
In the case of material is not pulled off, tension force is the biggest, and the operation of rolling is the most smooth and easy.But state is opened in the mistake having gone out finishing mill at wire rod afterbody
Under, the overstepping coefficient of Laying head has been set and has performed, and under the state of tension that it is powerful, wire rod is accelerated after losing and opening.Afterbody adds
The setting sending roller seeks to ensure afterbody reduction of speed under the effect of chucking power, thus ensures the constant of toast speed and afterbody cast
Normal.So requiring under this state that the overstepping coefficient of Laying head can not be too big, after experiment proves overstepping coefficient ＞ 1.04, meeting
Clamping and reduction of speed effect to pinch roll bring difficulty, and the method increasing chucking power can only be taked to ensure normally telling of afterbody
Silk.For ensureing that afterbody occurs without catcher mark, its parameter sets contrast as shown in table 1.
Table 1 overstepping coefficient, speed of weaving silk, the contrast of chucking power size
| 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, using 5 sections of water tank coolings after finish rolling, first three water tank cooling temperature drop controls at 40-50 DEG C, cooling procedure wire rod
Shake amplitude controlling at 10-25mm；
Cooling after finishing mill uses 5 sections of water tank coolings, a length of 6m of every section of water tank, the recovery section between each water tank
Length is averagely at 7m, and maximum advantage is ensuring that every section of rational temperature drop of water tank, is obtained in that preferably after in turn ensure that cooling
Temperature reply, the intensity of cooling of every section is set simultaneously, is controlled at 40-50 DEG C, experiment surface when intensity of cooling surpass
After crossing 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 is difficult to stable entrance pinch roll, thus the most just cannot ensure pinch roll clamp normally,
Reduction of speed, can only ensure reduction of speed effect 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 to affect wire rod reduction of speed effect and the key factor of surface catcher mark coarse-grain.Ground by substantial amounts of experiment
Studying carefully discovery, chucking power is the biggest, and surface occurs that the tendentiousness of catcher mark is the strongest.But the pass between the coarse-grain of catcher mark position and chucking power
System, is realized by clamping deflection.Clamping can form the micro-plastic deformation of local to surface, and classical recrystallization is theoretical
Surface deformation meeting crystal grain thinning, but micro-plastic deformation or rigid-plastic deformation, not only will not occurrence dynamics recrystallization softening crystalline substance
Grain, and can cause deuterogenesis's Static Recrystallization or tissue that the abnormal growth of specific orientation occurs, near Fig. 1 and 2 catcher mark
Facet coarse-grain is exactly good evidence.Setting primarily to ensure that the head of rolled piece can enter smoothly and pinch of opening degree
Roller, so the opening degree of pinch roll is relevant with the clip slot size of pinch roll and rolling specs.Opening degree is too big, and workpiece front end can push up
Pinch rolls outlet guide and guard cause heap steel；Opening degree is the least, and workpiece front end can push up pinch roll, and causes heap steel.For ensureing effectively
Clamping, the degree of remaining silent of pinch roll sets and ensure that pinch roll is the least in the case of not pasting roller, typically just may be used at 0.55-0.65mm
Well to realize this function, and degree of remaining silent also is to affect pinch roll wire rod applies a parameter guarantee of frictional force,
Degree of remaining silent is too big, and wire rod cannot be implemented effectively clamping by pinch roll, and degree of remaining silent is the least, will increase the chucking power on surface,
Thus catcher mark coarse-grain occurs.
Table 3 chucking power, Light deformation amount and the relation of 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% |
It is an advantage of the current invention that the technological parameter by optimizing the operation of rolling, use afterbody folder in operation of rolling whole process
Under the process conditions sent, it is possible not only to effectively control the rolling of stable wire rod and weave silk, and realizes high speed wire bar clip surface
The control of trace coarse-grain controls, and on the one hand improves wire rod surface quality, on the other hand achieves structural homogenity control, optimizes
The performance of product.It is especially suitable for Gao Xian factory and carries 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 surface catcher mark and the coarse-grain of high line 6.5mm wire rod 45# steel.
Detailed description of the invention
Embodiment 1
The cold-forging steel M6 wire rod of Shoudu Iron and Steel Co exploitation specification 6.5mm is applied, concretely comprises the following steps:
A () wire rod rolling specs is 6.5mm, finishing mill outlet speeds control controls at 80m/s, Laying head overstepping coefficient
1.03；
B using 5 sections of water tank coolings after () finish rolling, first three water tank cooling temperature drop controls at 40 DEG C, cooling procedure wire rod
Maximal jitter amplitude 20mm；
C () afterbody clamp pressure controls at 0.24Mpa；
Embodiment 2
The bonding wire wire rod of Shoudu Iron and Steel Co exploitation specification 5.5mm is applied, concretely comprises the following steps:
A () wire rod rolling specs is 5.5mm, finishing mill outlet speeds control controls at 86m/s, Laying head overstepping coefficient
1.01；
B using 5 sections of water tank coolings after () finish rolling, first three water tank cooling temperature drop controls at 50 DEG C, cooling procedure wire rod
Shake amplitude controlling is at 25mm；
C () afterbody clamp pressure controls at 0.20Mpa.
Claims (1)
1. the method controlling high speed wire bar surface catcher mark coarse-grain, it is characterised 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；
B using 5 sections of water tank coolings after () finish rolling, first three water tank cooling temperature drop controls at 40-50 DEG C, trembling of cooling procedure wire rod
Dynamic amplitude controlling is at 10-25mm；
C () afterbody clamp pressure controls at 0.20-0.24Mpa；Degree of remaining silent controls at 0.55-0.65mm；
D () Laying head overstepping coefficient controls at 1.01-1.03；Laying temperature controls at 880-900 DEG C.
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| CN102259112B (en) * | 2011-04-12 | 2013-04-17 | 首钢总公司 | Method for controlling structural homogeneity of high-carbon steel coil rod for deep drawing of 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 |
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