CN103302457B - A kind of Bar Wire Product and hot strip rolling mill working roll production technology - Google Patents
A kind of Bar Wire Product and hot strip rolling mill working roll production technology Download PDFInfo
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- CN103302457B CN103302457B CN201310242603.8A CN201310242603A CN103302457B CN 103302457 B CN103302457 B CN 103302457B CN 201310242603 A CN201310242603 A CN 201310242603A CN 103302457 B CN103302457 B CN 103302457B
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Abstract
The invention discloses a kind of Bar Wire Product and hot strip rolling mill working roll production technology, this technique is as follows: utilize intermediate frequency furnace that high alloy material carries out melting working lining molten iron, next specific process utilizing centrifugal compound to add flushing low-alloy spheroidal graphite cast-iron molten iron carries out cast and forms centrifugal compound roll blank, then blank roll is carried out roughing, meet high-temperature heat treatment condition, through high-temperature heating austenitizing, control quenching cooling and add temper, half finish turning processing, the operations such as finish turning processing, reconditioning is to finished product, and last pass needs slot treatment according to milling train.The present invention uses high alloy working layer and unique centrifugal top pouring type half that adds to rinse the roll that pouring technology produces, avoiding conventional method, to produce the metallographic structure that causes of minor diameter centrifugal compound roll core structure alloy content height poor, performance indications do not reach and require phenomenon, stop to be susceptible to when steel rolling uses the phenomenon of the severe accidents such as roll breakage, improve the service life of roll.
Description
Technical field
The present invention relates to a kind of Bar Wire Product and narrow strip rolling mill working roll production method, especially a kind of high-alloy centrifugal
Composite roll special producing technique.
Background technology
Along with the fast development of China's steel rolling industry, the work roll cooling as one of rolling mill main spare part to be consumed is proposed
Higher requirement, for improving the service life of roll, reduces steel rolling cost, and the material improvement of roll is extremely the most urgent, especially
Being bar wire rod rolling mill and narrow strip rolling mill, carrying out high alloy working lining roll has been the task of top priority, and due to bar wire rod rolling mill and
Used by strip mill, roll general requirements is less, when using conventional centrifugal compound mode to produce high alloy material working lining roll
Easily form a large amount of alloy at core, cause core carbide amount excessive, low strength, it is susceptible to roll breakage etc. when steel rolling and dislikes
Sexual behavior event.The core alloy content that technique makes at present is more than 0.7%, and carbide content is more than 8%.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of Bar Wire Product and hot strip rolling mill working roll production technology,
To solve the core alloy content height that the high alloy working lining roll that employing centrifugal compound mode produces at present easily occurs, carbide
Measure excessive problem, improve its intensity and toughness.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of Bar Wire Product and hot strip rolling mill
Use working roll production technology, comprise the following steps that: a, employing high alloy material are through intermediate frequency furnace melting working lining molten iron；B, adopt
With low-alloy spheroidal graphite cast-iron material through intermediate frequency furnace melting core molten iron c, it is centrifuged pouring into a mould working lining molten iron；Teeming after d, mould assembling
Formula adds half flushing cast core molten iron and forms composite roll blank, by rinsing replacing section core molten iron, it is ensured that core alloy
Content meets performance requirement；E, carry out blank roll proceeding to manufacturing procedure after the assay was approved accordingly；F, stroke bottom center hole line,
Bore bottom center hole；G, top bottom centre bore, folder emits end roll neck and carries out rough turn processing；H, heat-barrier material is utilized to enter at roll neck position
Row wrapping protection；I, the roll through step i is put into high-temperature heat treatment resistance furnace by technological requirement heat, make body of roll position reach
To technological requirement hardening heat and be incubated；J, the roll through step j is hung out resistance furnace, be placed on cooling scene, enter
Row controls speed cooling；K, roll cool down the complete resistance furnace that turns and carry out temper；L, tempering turn manufacturing procedure, again after terminating
Reconditioning bottom center hole；M, top bottom centre bore, folder emits end roll neck and carries out finish turning processing；N, rule and process keyway, boring is washed flat
Head plane, processes fillet everywhere；O, fine grinding body of roll roll neck are to finished product；P, product inspection.
For improving the service life of roll, the chemical composition of high alloy material of the present invention and low-alloy spheroidal graphite cast-iron is divided
It is not:
。
In step c of the present invention, centrifugal casting working lining molten iron uses horizontal centrifuge, and gravitation multiple selects more than 80.
For avoiding occurring crackle and formulate rational heat treatment process parameter when roll heat treatment, step g, h it
Between carry out body of roll roll neck position metallographic and carrying out flaw detection, qualified after proceed to heat treatment step.
Too high for ensureing roll neck temperature temperature when heating, affect performance, the heat-barrier material in described step h typically uses
For ceramic fibre, wrapping thickness is 30-50mm.
For ensureing the austenitizing degree of roll, in described step i, heating-up temperature is typically between 1000-1200 DEG C.
For avoiding roll after being machined to finished product because the tissue defective cause of hardness is given up, between described step k, l, carry out roller
Body, roll neck metallographic and hardness determination, qualified after turn manufacturing procedure, once success.
In described step d half rinses particularly as follows: after top pouring type has watered core molten iron, continue to increase cast core molten iron
Amount, displaces a part by watering for the first time to rinse into the core molten iron of die cavity, overflow pipe overflows, concrete flushing displacement molten iron
Measure according to product specification different with working lining thickness and alloy content and different.
Use and have the beneficial effects that produced by technique scheme: use unique centrifugal compound to add top pouring type half and rinse
The Bar Wire Product of pouring procedure manufacture and strip mill roll, solve conventional method and produce minor diameter high alloy working lining roll
The higher difficult problem of core alloy, while improving working lining life-span more than 3 times, has stopped to cause because core alloy content is higher
At machine roll breakage accident.Because: the minor diameter high-alloy centrifugal using conventional top pouring type cast core molten iron method to produce is combined and rolls
Roller, for ensureing the wearability of roll, working lining alloy content is the highest, and when carrying out core cast, for ensureing working lining
Merge very well with core, need corrosion a part of working lining molten iron to enter core, core alloy content so can be caused higher, from
And cause carbide content in core tissue too high, and directly contributing core plasticity and toughness reduces, intensity reduces；And use teeming
Formula adds half backwashing manner cast core molten iron, after top pouring type cast core molten iron, then carries out the core molten iron of half flushing cast
That can be poured into a mould by top pouring type cements out a part containing heavy alloyed core molten iron, reduces core molten iron alloy content, thus
Reduce the carbide content in core tissue, improve the plasticity of core, toughness and intensity, improve roll working lining wearability
Simultaneously, it is to avoid roll in rolling process because of serious accidents such as core strength low generation roll breakages.
Accompanying drawing explanation
Fig. 1 is working lining centrifugal casting schematic diagram of the present invention；
Fig. 2 be top pouring type of the present invention add half flushing cast fill out core schematic diagram；
Wherein, 1, depositing funnel；2, outer layer molten iron；3, cold mould；4, horizontal centrifuge；5, core funnel is filled out；6, rising head case；7、
End cap case；8, working lining；9, end cap case；10, centre circle；11, under casing；12, overflow pipe；13, core molten iron.
Detailed description of the invention
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Embodiment 1: as a example by certain the bar mill roller domestic producing φ 370 × 600 × 1710, illustrates production height
Alloy centrifugal compound bar wire rod and the technical process of strip mill working roll.
Working lining high alloy material used is high-speed steel material, and core material selects low-alloy spheroidal graphite cast-iron, these materials
Material disclosure satisfy that production centrifugal compound high alloy roller performance requirement.Composition as shown in table 1 below (be weight percentage, remaining
Amount is ferrum):
Table 1
The concrete technology step of centrifugal compound high-speed steel roll is as follows: a, employing high speed steel material work through intermediate frequency furnace melting
Layer molten iron；B, use common low-alloy spheroidal graphite cast-iron material through intermediate frequency furnace melting core molten iron；C, be centrifuged pour into a mould working lining
Molten iron, sees accompanying drawing 1；After d, mould assembling, top pouring type pours into the core iron water amount of requirement, continuously adds appropriate core molten iron and rushes
Washing replacing section core molten iron, final cast forms composite roll blank, sees accompanying drawing 2；E, blank roll is carried out metallographic group
Knit preliminary test, qualified after proceed to manufacturing procedure；F, stroke bottom center hole line, bore bottom center hole；G, top bottom centre bore, folder
Emit end roll neck to carry out rough turn being machined to barrel diameter φ 382mm；H, to roll neck position wrap up 40mm thickness ceramic fibre；I, by roll
Put into high-temperature heat treatment resistance furnace and be heated to 1000-1150 DEG C of insulation；J, insulation terminate rear roll and hang out resistance furnace, are placed on cold
On-the-spot, it is controlled cooling；K, roll cool down the complete resistance furnace that turns and carry out temper；L, tempering turn processing work after terminating
Sequence, the hole of reconditioning bottom center again；M, top bottom centre bore, folder emits end roll neck to carry out finish turning and is machined to φ 371mm；N, line and
Homalocephalus plane is washed in processing keyway, boring, processes fillet everywhere；O, fine grinding body of roll roll neck to the finished product i.e. body of roll a size of φ 370 ×
600；P, product inspection hardness of roll body are 80-85HSD, and roll neck hardness is 40-45HSD, through detecting its core alloy total amount are
0.51%, carbonized thing content is 4.2%, meets user's requirement and machine has normally used on user, respond well, tentatively unites
Meter amount of rolling has reached common high-ni-cr roll 3.0 times.
Embodiment 2: as a example by certain the high-speed wire mill roller domestic producing φ 340 × 600 × 1465, illustrates production height
Alloy centrifugal compound bar wire rod and the technical process of strip mill working roll.
Working lining high alloy material used by this roller is similarly high-speed steel material, because milling train conditional operation is different, composition with
Slightly distinguishing for upper one, core material selects low-alloy spheroidal graphite cast-iron, and the roll of these manufacture of materials disclosure satisfy that user equally
Requirement.Composition (being weight percentage, surplus is ferrum) as shown in table 2 below:
Table 2
The concrete technology step of centrifugal compound high alloy roll is as follows: a, employing high speed steel material work through intermediate frequency furnace melting
Layer molten iron；B, use common low-alloy spheroidal graphite cast-iron material through intermediate frequency furnace melting core molten iron；C, be centrifuged pour into a mould working lining
Molten iron；After d, mould assembling, top pouring type pours into the core iron water amount of requirement, continuously adds appropriate core molten iron and is rinsed replacing section
Core molten iron, final cast forms composite roll blank；E, blank roll is carried out metallographic structure preliminary test, qualified after proceed to
Manufacturing procedure；F, stroke bottom center hole line, bore bottom center hole；G, top bottom centre bore, folder emits end roll neck and carries out rough turn processing
To barrel diameter φ 352mm；H, to roll neck position wrap up 30mm thickness ceramic fibre；I, roll is put into high-temperature heat treatment resistance furnace
It is heated to 1050-1200 DEG C of insulation；J, insulation terminate rear roll and hang out resistance furnace, are placed on cooling scene, carry out air-cooled adding sky
Cold control speed cools down；K, roll cool down the complete resistance furnace that turns and carry out temper；L, tempering turn manufacturing procedure, again after terminating
Reconditioning bottom center hole；M, top bottom centre bore, folder emits end roll neck to carry out finish turning and is machined to φ 341mm；N, rule and process key
Groove, boring wash homalocephalus plane, process fillet everywhere；O, fine grinding body of roll roll neck to the finished product i.e. body of roll a size of φ 340 × 600；P, one-tenth
It is 83-87HSD that hardness of roll body is tested in product examine, and roll neck hardness is 35-40HSD, and its core alloy total amount is 0.53%(weight after testing
Amount), carbonized thing content is 4.5%(weight).Meet user's requirement.At present this roller on user machine normally try out, tentatively
Statistics amount of rolling has reached more than 3 times of common alloy ductile iron the most.
We prove through substantial amounts of pilot production: for bar wire rod rolling mill and strip mill small diameter roller, work as work
As layer be high alloy material time, the roll produced by centrifugal compound mode of the present invention, its core alloy total amount is not more than 0.6%,
Carbonized thing content is less than 5%, both ensure that the service life of working lining, and can guarantee that again core strength met milling train demand.Adopt
Use this technique, the content of the strong carbide alloy such as major control core chromium, molybdenum.
The present invention uses high alloy working layer and unique centrifugal top pouring type half that adds to rinse rolling of pouring technology production
Roller, it is to avoid it is poor that conventional method produces the metallographic structure that minor diameter centrifugal compound roll core structure alloy content height causes, property
Energy index does not reaches and requires phenomenon, has stopped to be susceptible to when steel rolling uses the phenomenon of the severe accidents such as roll breakage, has improve and roll
The service life of roller.The high alloy roll effective working lining thickness manufactured is more than 30mm, and hardness of roll body reaches more than 80HSD, and roller
Stiffness of neck in children degree but can control at below 45HSD, fully meets the use requirement of Bar Wire Product and strip mill, and service life, ratio was general
Logical high-ni-cr roll improves more than 3 times.
Wherein, pouring into a mould working lining and see accompanying drawing 1 in above-described embodiment, cold mould 3 is high speed rotating, ferrum on horizontal centrifuge 4
Water pours into cold mould 3 die cavity by depositing funnel 1, after solidification certain time, slings and carries out mould assembling cast core molten iron.
Seeing accompanying drawing 2, this figure is core cast schematic diagram after mould assembling, and core molten iron pours into die cavity by filling out core funnel 5, waters
Open overflow pipe 12 after having noted, continue to pour into core molten iron, and overflow partial molten iron to reduce core conjunction by overflow pipe 12
Gold content.
Claims (8)
1. a Bar Wire Product and hot strip rolling mill working roll production technology, it is characterised in that: carry out in the steps below:
A, employing high alloy material are through the working lining molten iron of intermediate frequency furnace melting working roll；
B, employing low-alloy spheroidal graphite cast-iron material are through the core molten iron of intermediate frequency furnace melting working roll；
C, be centrifuged pour into a mould working lining molten iron；
Use top pouring type to add half flushing cast core molten iron after d, mould assembling and form composite roll blank；
E, above-mentioned roller blank is checked accordingly, qualified after proceed to manufacturing procedure；
F, stroke bottom center hole line, bore bottom center hole；
G, top bottom centre bore, folder emits end roll neck and carries out rough turn processing；
H, roll neck position is utilized heat-barrier material carry out wrapping protection；
I, the roll through step h is put into high-temperature heat treatment resistance furnace by technological requirement heat, austenitizing, make body of roll position
Reach technological requirement hardening heat and be incubated；
J, the roll through step i is hung out resistance furnace, be placed on cooling scene, control speed and cool down；
K, roll cool down the complete resistance furnace that turns and carry out temper, and temperature is 450-580 DEG C；
L, tempering turn manufacturing procedure after terminating, the hole of reconditioning bottom center again；
M, top bottom centre bore, folder emits end roll neck and carries out finish turning processing；
N, rule and process keyway, boring and milling homalocephalus plane, processing fillet everywhere；
O, fine grinding body of roll roll neck are to finished product；
P, product inspection.
A kind of Bar Wire Product the most according to claim 1 and hot strip rolling mill working roll production technology, is characterized in that: institute
The chemical composition stating high alloy material and low-alloy spheroidal graphite cast-iron is respectively (weight percentage), and surplus is ferrum:
。
A kind of Bar Wire Product the most according to claim 1 and hot strip rolling mill working roll production technology, is characterized in that: institute
Stating centrifugal casting working lining molten iron in step c and use horizontal centrifuge, gravitation multiple selects more than 80.
A kind of Bar Wire Product the most according to claim 1 and hot strip rolling mill working roll production technology, is characterized in that: institute
State in step d half to rinse particularly as follows: after top pouring type has watered core molten iron, continue to increase cast core iron water amount, by first
The secondary core molten iron flushing watered into die cavity displaces a part, overflow pipe overflow.
A kind of Bar Wire Product the most according to claim 1 and hot strip rolling mill working roll production technology, is characterized in that:
Carry out the body of roll, roll neck position metallographic and carrying out flaw detection between described step g, h, qualified after proceed to heat treatment step.
A kind of Bar Wire Product the most according to claim 1 and hot strip rolling mill working roll production technology, is characterized in that: institute
Stating the heat-barrier material in step h and use ceramic fibre, wrapping thickness is 40～50mm.
A kind of Bar Wire Product the most according to claim 1 and hot strip rolling mill working roll production technology, is characterized in that: institute
State in step i heating-up temperature between 1000-1200 DEG C.
A kind of Bar Wire Product the most according to claim 1 and hot strip rolling mill working roll production technology, is characterized in that:
The body of roll, roll neck metallographic and hardness determination is carried out between described step k, l.
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| CN201310242603.8A CN103302457B (en) | 2013-06-19 | 2013-06-19 | A kind of Bar Wire Product and hot strip rolling mill working roll production technology |
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| CN103302457B true CN103302457B (en) | 2016-09-21 |
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| CN104525889B (en) * | 2014-12-31 | 2016-09-07 | 中钢集团邢台机械轧辊有限公司 | A kind of manufacture method of high-speed steel roll |
| CN106702114A (en) * | 2016-12-29 | 2017-05-24 | 大连冶金工具厂有限公司 | Production process of alloy cast steel roller |
| CN107377892A (en) * | 2017-06-22 | 2017-11-24 | 成都三强轧辊股份有限公司 | A kind of cast steel roll casting device and casting technique |
| CN112264465B (en) * | 2020-09-29 | 2022-06-17 | 武汉钢铁有限公司 | Centrifugal composite roller |
| CN114351032B (en) * | 2021-12-21 | 2023-12-12 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-material vertical roll |
| CN114952184B (en) * | 2022-04-15 | 2024-03-29 | 辽宁恒通冶金装备制造有限公司 | Hot rolling working roll preparation process |
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Effective date of registration: 20180408 Address after: 054800 Pujiang street, Qinghe County, Xingtai, Hebei Province, No. 118 Patentee after: Xingtai hung Ke high speed steel roll Co., Ltd. Address before: 054000 unit 3, building No. 202 of Renhe home, Qiaoxi District, Xingtai, Hebei Patentee before: Qin Yingfang |