CN104400316A - Method for increasing service life of rolling mill guide plate - Google Patents
Method for increasing service life of rolling mill guide plate Download PDFInfo
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- CN104400316A CN104400316A CN201410779086.2A CN201410779086A CN104400316A CN 104400316 A CN104400316 A CN 104400316A CN 201410779086 A CN201410779086 A CN 201410779086A CN 104400316 A CN104400316 A CN 104400316A
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- welding
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- 238000005096 rolling process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001965 increasing effect Effects 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 238000005275 alloying Methods 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 67
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 22
- 230000008929 regeneration Effects 0.000 claims description 20
- 238000011069 regeneration method Methods 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 229910001018 Cast iron Inorganic materials 0.000 claims description 13
- 238000003754 machining Methods 0.000 claims description 11
- 229910052759 nickel Inorganic materials 0.000 claims description 11
- 230000001737 promoting effect Effects 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 10
- 230000002265 prevention Effects 0.000 claims description 10
- 238000005476 soldering Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 16
- 239000010949 copper Substances 0.000 description 14
- 238000003723 Smelting Methods 0.000 description 10
- 230000001939 inductive effect Effects 0.000 description 9
- 238000000227 grinding Methods 0.000 description 8
- 238000005498 polishing Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910001562 pearlite Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 238000011081 inoculation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 description 1
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000001138 tear Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for increasing service life of rolling mill guide plate, wherein the original guide plate material QT500-7 is microalloyed for increasing the service life of the rolling mill guide plate, alloying elements Mn and Cu are added in a matching manner, and the microalloyed QT500-7 is used as the material for manufacturing the guide plate; the size of the original guide plate is enlarged when manufacturing the guide plate; when the guide plate is worn so much that the guide plate cannot be used, the guide plate can be regenerated by a manner of reducing the size of the guide plate in order to remove the worn portion, or by a manner of filling up the worn portion through overlaying technology. The method for increasing service life of rolling mill guide plate effectively increases the abrasive resistance of the rolling mill guide plate, greatly increases the service life of the guide plate, and creates significant benefits for enterprises.
Description
Technical field
The invention belongs to Mill Parts preparation and Remanufacture field thereof, be specifically related to rolling mill guide and Remanufacture technique thereof.
Background technology
Rolling mill guide is that steel rolling mill consumes very large part, and it at high temperature bears larger load, and is subject to various wearing and tearing, impact.The service life of guide plate is directly connected to the production efficiency of milling train and the surface quality of rolled piece, and therefore, there is very important realistic meaning in the service life extending guide plate.The main failure forms of rolling mill guide is that nose weares and teares deep groove, but the directly replacement after losing efficacy of ordinary circumstance bottom guide, do not keep in repair, not only waste ERM, and add entreprise cost.So far, the material that rolling mill guide generally uses is cast iron and high-chromium-nickel alloy, uses spheroidal graphite cast-iron QT500-7 before Hefei Orient Energy Saving Technology Co., Ltd., poor performance, the life-span is poor, but high-chromium-nickel alloy is expensive, poor toughness, service life is also low.
Summary of the invention
The object of the invention is in order to solve rolling mill guide under arms time serious wear, life-span short, replace the problems such as frequent, a kind of method promoting rolling mill guide service life is provided.
Technical solution problem of the present invention, adopts following technical scheme:
The present invention promotes the method in rolling mill guide service life, its feature is: for promoting rolling mill guide service life, carry out microalloy treatment to former guide plate material QT500-7, alloying element Mn and Cu is added in collocation, to carry out the QT500-7 after microalloying as the material manufacturing guide plate; When manufacturing guide plate, the size of former guide plate is increased; Guide plate wear up to cannot use time, make guide plate regeneration in the mode removing wearing part by reducing guide plate size or by the mode filling up wearing part with bead-welding technology, guide plate regenerated.
The present invention promotes the method in rolling mill guide service life, and its feature is also: the mass percent of adding metallic element Mn in QT500-7 is 0.5% ~ 0.8%, and the mass percent of adding metallic element Cu is 0.8% ~ 1.2%.
When manufacturing guide plate, the size of former guide plate being increased and refers to the grooved size of former guide plate increase 4 ~ 5mm.
In the mode removing wearing part, guide plate regeneration is referred to by the method cutting removal guide plate of machining by reduction guide plate size peripheral, make guide plate grooved size reduction 1.5 ~ 2mm, to remove guide plate wearing part, realize guide plate and regenerate.
The method that the mode filling up wearing part by bead-welding technology makes guide plate regenerate is: casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 150 ~ 200 DEG C, roasting 1h; Be under the AC power of 70 ~ 120A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention.
The present invention compared with prior art, has the feature of following three aspects:
1, in raw material, microalloy treatment has been carried out.The use material of former guide plate is QT500-7, and the present invention is to its Alloying Treatment, and alloying element Mn-Cu is added in collocation, wherein adds Mn0.5wt% ~ 0.8wt%, adds Cu0.8wt% ~ 1.2wt%.QT500-7 main chemical compositions is: C content 3.1wt% ~ 3.7wt%; Si content 2.2wt% ~ 2.8wt%; Matrix is ferrite and pearlite, has good plasticity and certain intensity, hardness HB180 ~ 230, but its wearability is not enough.In alloying element, a small amount of alloying element Mn and Cu is added in collocation can the wearability of larger raising magnesium iron; Add micro-Mn and can form alloyed cementite, Mn incorporates Fe
3(Fe, Mn) that C is formed
3c, along with the increase of Fe content, organizes medium pearlite amount to increase, and hardness increases, but percentage elongation declines, and considers its serviceability, therefore adds Mn0.5wt% ~ 0.8wt%.But due to the segregation of Mn, obtain whole pearlitic structrures can be with and serve defect with alloying of manganese, thus collocation uses alloying element cu, adds Cu0.8wt% ~ 1.2wt%, with the wearability obtained.Copper can promote that graphite is formed, stable austenite, is conducive to the graphite obtaining rounding, reduces the stress caused because of irregular graphite and concentrates, the problem of guide plate degradation.And when eutectoid reaction, the remarkable refinement of copper and stabilizing pearlite, it promotes that pearlitic ability is 3 times of manganese.Therefore comprehensive interpolation alloying element Mn, Cu, obtain more more tiny pearlite, well improve the wearability of spheroid.
The production method of copper-manganese microalloying rolling mill guide comprises the smelting of inductive electromagnetic stove, nodularization, cast are bred in stokehold, wherein, in inductive electromagnetic stove smelting procedure process, adopts ferromanganese and copper iron to carry out microalloying.When smelting temperature reaches 1450 DEG C, through spectrometer, composition detection is finely tuned.Stokehold spheroidization and inoculation: the nodulizer adopting FeSiMg8RE7, granularity 20mm, addition is molten iron total amount 1.5%; Adopt the inovulant of 75 ferrosilicon, granularity 10mm, addition is molten iron total amount 2.0%; Carry out spheroidization and inoculation process.Breed, about the 3 minutes nodularization time interval, breed after pour into a mould after 2 ~ 3 minutes, pouring temperature is 1400 DEG C.
2, have employed reparative regeneration manufacturing process.The present invention, when guide plate designs, reuses number of times to increase it, creatively on the basis of general guide plate size, increases its size 4 ~ 5mm; When guide plate work uses a period of time, after irregular wear to a certain degree appears in surface, adopt the method for machine cut guide plate grooved size to be reduced 1.5 ~ 2mm at every turn, just can continue to use.Production practices show, increasing or change little guide plate size affects rolled piece surface accuracy hardly, and the inventive method is feasible in actual production.After guide plate normal wear, generally can carry out 2 machining again, be equivalent to the life-span increasing by 2 times on former guide plate basis, the use value of guide plate can be made full use of, greatly reduce its production cost, obtain significant economic benefit.
3, built-up welding Remanufacture technology is employed.Guide plate, through 2 machinings with after reusing, when can not continue to be on active service, by carrying out built-up welding at its working face, can make guide plate continue normal use.Facts have proved, use built-up welding regeneration techniques at least can again reuse guide plate once, be equivalent to the service life that improve 1 times, guide plate.The specific features of bead-welding technology is as follows:
(1) preweld cleaning: use clearage with grinding wheel abrading section before built-up welding, polishing light.
(2) built-up welding, its feature is as follows:
Consider to treat that resurfacing welding material matrix is QT500-7, resurfacing welding material must have mechanical property and welding performance, therefore uses casting 308 pure nickel welding electrode for cast iron of Φ 3.2, and before weldering, welding rod is preheating to 150 DEG C ~ 200 DEG C and cures 1h.Wherein pure nickel welding electrode for cast iron has good cracking resistance and processing characteristics, can be good at adapting to the severe working environment of guide plate.
QT500-7 cast iron welding performance is good, therefore does not need before built-up welding to carry out preheating to it, directly carries out built-up welding under normal temperature.
AC power is selected in built-up welding, and electric current selects 70 ~ 120A, prevents big current from causing the uneven and serious undercut phenomenon of surfacing hardness.
(3) postwelding hammering weld seam, eliminates soldering district stress, Crack prevention, and is polished by its face of weld.
Compared with the prior art, the present invention has following beneficial effect:
1, the present invention is to carry out the QT500-7 after microalloying as the material manufacturing guide plate, significantly improves the wearability of guide plate.After adding alloying element, the service life of 2 times, guide plate can be improved, reduce the maintenance cost of guide plate, extend its service time.
2, the present invention is by increasing the size of guide plate, in conjunction with cutting and built-up welding two kinds of renovation process, makes can at least increase by 3 times the service life of guide plate, and the utilization rate of guide plate improves, and has fully excavated the potential value of guide plate.
3, the present invention is by adding alloying element, introducing a series of innovations such as Remanufacture technique, and make guide plate improve 5 ~ 6 times service life, production cost significantly reduces, and significantly improves the economic benefit of enterprise.
Detailed description of the invention
Embodiment 1
1, microalloying: for promoting rolling mill guide service life, microalloy treatment is carried out to former guide plate material QT500-7, the basis of former guide plate material QT500-7 is added weight ratio be 0.5% metallic element Mn and weight ratio be 1.2% metallic element Cu, breed nodularization through the smelting of inductive electromagnetic stove, stokehold, pour into a mould to obtain rolling mill guide, guide plate average hardness is HB306, and wearability on average improves 2 times.
2, reparative regeneration: increase 4mm in the basic upper guide plate grooved size of general guide plate, when guide plate wears up to a certain degree, adopts the way of machining to make guide plate grooved size reduce 1.5mm, then continues to use.Circulating use like this, guide plate can reuse 2 times, increases the life-span 2 times.
3, built-up welding regeneration: when guide plate wear up to cannot use time, and the mode also not by reducing guide plate size regenerates constantly, adopting bead-welding technology to fill up wearing part makes guide plate regenerate, concrete steps are: use clearage with grinding wheel abrading section, polishing light, casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 150 DEG C, roasting 1h; Be under the AC power of 120A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention, then polishes face of weld.Built-up welding back guide can reuse, and is again improve the service life of 1 times, guide plate by built-up welding.
Embodiment 2
1, microalloying: for promoting rolling mill guide service life, microalloy treatment is carried out to former guide plate material QT500-7, the basis of former guide plate material QT500-7 is added weight ratio be 0.6% metallic element Mn and weight ratio be 1.0% metallic element Cu, breed nodularization through the smelting of inductive electromagnetic stove, stokehold, pour into a mould to obtain rolling mill guide, guide plate average hardness is HB310, and wearability on average improves 2 times.
2, reparative regeneration: increase 4mm in the basic upper guide plate grooved size of general guide plate, when guide plate wears up to a certain degree, adopts the way of machining to make guide plate grooved size reduce 1.5mm, then continues to use.Circulating use like this, guide plate can reuse 2 times, increases the life-span 2 times.
3, built-up welding regeneration: when guide plate wear up to cannot use time, and the mode also not by reducing guide plate size regenerates constantly, adopting bead-welding technology to fill up wearing part makes guide plate regenerate, concrete steps are: use clearage with grinding wheel abrading section, polishing light, casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 160 DEG C, roasting 1h; Be under the AC power of 120A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention, then polishes face of weld.Built-up welding back guide can reuse, and is again improve the service life of 1 times, guide plate by built-up welding.
Embodiment 3
1, microalloying: for promoting rolling mill guide service life, microalloy treatment is carried out to former guide plate material QT500-7, the basis of former guide plate material QT500-7 is added weight ratio be 0.8% metallic element Mn and weight ratio be 0.8% metallic element Cu, breed nodularization through the smelting of inductive electromagnetic stove, stokehold, pour into a mould to obtain rolling mill guide, guide plate average hardness is HB318, and wearability on average improves 2 times.
2, reparative regeneration: increase 5mm in the basic upper guide plate grooved size of general guide plate, when guide plate wears up to a certain degree, adopts the way of machining to make guide plate grooved size reduce 1.5mm, then continues to use.Circulating use like this, guide plate can reuse 2 times, increases the life-span 2 times.
3, built-up welding regeneration: when guide plate wear up to cannot use time, and the mode also not by reducing guide plate size is when regenerating, adopting bead-welding technology to fill up wearing part makes guide plate regenerate, concrete steps are: use clearage with grinding wheel abrading section, polishing light, casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 170 DEG C, roasting 1h; Be under the AC power of 100A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention, then polishes face of weld.Built-up welding back guide can reuse, and is again improve the service life of 1 times, guide plate by built-up welding.
Embodiment 4
1, microalloying: for promoting rolling mill guide service life, microalloy treatment is carried out to former guide plate material QT500-7, the basis of former guide plate material QT500-7 is added weight ratio be 0.7% metallic element Mn and weight ratio be 0.8% metallic element Cu, breed nodularization through the smelting of inductive electromagnetic stove, stokehold, pour into a mould to obtain rolling mill guide, guide plate hardness is HB290, and wearability on average improves 2 times.
2, reparative regeneration: increase 5mm in the basic upper guide plate grooved size of general guide plate, when guide plate wears up to a certain degree, adopts the way of machining to make guide plate grooved size reduce 2mm, then continues to use.Circulating use like this, guide plate can reuse 2 times, increases the life-span 2 times.
3, built-up welding regeneration: when guide plate wear up to cannot use time, and the mode also not by reducing guide plate size regenerates constantly, adopting bead-welding technology to fill up wearing part makes guide plate regenerate, concrete steps are: use clearage with grinding wheel abrading section, polishing light, casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 180 DEG C, roasting 1h; Be under the AC power of 80A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention, then polishes face of weld.Built-up welding back guide can reuse, and is again improve the service life of 1 times, guide plate by built-up welding.
Embodiment 5
1, microalloying: for promoting rolling mill guide service life, microalloy treatment is carried out to former guide plate material QT500-7, the basis of former guide plate material QT500-7 is added weight ratio be 0.5% metallic element Mn and weight ratio be 0.8% metallic element Cu, breed nodularization through the smelting of inductive electromagnetic stove, stokehold, pour into a mould to obtain rolling mill guide, guide plate hardness is HB282, and wearability on average improves 1.5 times.
2, reparative regeneration: increase 4mm in the basic upper guide plate grooved size of general guide plate, when guide plate wears up to a certain degree, adopts the way of machining to make guide plate grooved size reduce 2mm, then continues to use.Circulating use like this, guide plate can reuse 2 times, increases the life-span 2 times.
3, built-up welding regeneration: when guide plate wear up to cannot use time, and the mode also not by reducing guide plate size regenerates constantly, adopting bead-welding technology to fill up wearing part makes guide plate regenerate, concrete steps are: use clearage with grinding wheel abrading section, polishing light, casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 190 DEG C, roasting 1h; Be under the AC power of 80A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention, then polishes face of weld.Built-up welding back guide can reuse, and is again improve the service life of 1 times, guide plate by built-up welding.
Embodiment 6
1, microalloying: for promoting rolling mill guide service life, microalloy treatment is carried out to former guide plate material QT500-7, the basis of former guide plate material QT500-7 is added weight ratio be 0.7% metallic element Mn and weight ratio be 1.0% metallic element Cu, breed nodularization through the smelting of inductive electromagnetic stove, stokehold, pour into a mould to obtain rolling mill guide, guide plate hardness is HB310, and wearability on average improves 2 times.
2, reparative regeneration: increase 5mm in the basic upper guide plate grooved size of general guide plate, when guide plate wears up to a certain degree, adopts the way of machining to make guide plate grooved size reduce 1.5mm, then continues to use.Circulating use like this, guide plate can reuse 2 times, increases the life-span 2 times.
3, built-up welding regeneration: when guide plate wear up to cannot use time, and the mode also not by reducing guide plate size is when regenerating, adopting bead-welding technology to fill up wearing part makes guide plate regenerate, concrete steps are: use clearage with grinding wheel abrading section, polishing light, casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 150 DEG C, roasting 1h; Be under the AC power of 70A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention, then polishes face of weld.Built-up welding back guide can reuse, and is again improve the service life of 1 times, guide plate by built-up welding.
Embodiment 7
1, microalloying: for promoting rolling mill guide service life, microalloy treatment is carried out to former guide plate material QT500-7, the basis of former guide plate material QT500-7 is added weight ratio be 0.8% metallic element Mn and weight ratio be 1.2% metallic element Cu, breed nodularization through the smelting of inductive electromagnetic stove, stokehold, pour into a mould to obtain rolling mill guide, guide plate hardness is HB330, and wearability on average improves 2.5 times.
2, reparative regeneration.Increase 5mm in the basic upper guide plate grooved size of general guide plate, when guide plate wears up to a certain degree, adopt the way of machining to make guide plate grooved size reduce 2mm, then continue to use.Circulating use like this, guide plate can reuse 2 times, increases the life-span 2 times.
3, built-up welding regeneration: when guide plate wear up to cannot use time, and the mode also not by reducing guide plate size regenerates constantly, adopting bead-welding technology to fill up wearing part makes guide plate regenerate, concrete steps are: use clearage with grinding wheel abrading section, polishing light, casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 160 DEG C, roasting 1h; Be under the AC power of 120A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention, then polishes face of weld.Built-up welding back guide can reuse, and is again improve the service life of 1 times, guide plate by built-up welding.
Claims (5)
1. one kind promotes the method in rolling mill guide service life, it is characterized in that: for promoting rolling mill guide service life, carry out microalloy treatment to former guide plate material QT500-7, alloying element Mn and Cu is added in collocation, to carry out the QT500-7 after microalloying as the material manufacturing guide plate; When manufacturing guide plate, the size of former guide plate is increased; Guide plate wear up to cannot use time, make guide plate regeneration in the mode removing wearing part by reducing guide plate size or by the mode filling up wearing part with bead-welding technology, guide plate regenerated.
2. the method in lifting rolling mill guide according to claim 1 service life, it is characterized in that: the mass percent of adding metallic element Mn in QT500-7 is 0.5% ~ 0.8%, the mass percent of adding metallic element Cu is 0.8% ~ 1.2%.
3. the method in lifting rolling mill guide according to claim 1 service life, is characterized in that: when manufacturing guide plate, the size of former guide plate is increased to refer to former guide plate grooved size is increased 4 ~ 5mm.
4. the method in lifting rolling mill guide according to claim 1 service life, is characterized in that:
By the mode reducing guide plate size, guide plate regeneration is referred to by the method cutting removal guide plate of machining peripheral, make guide plate grooved size reduce 1.5 ~ 2mm, to remove guide plate wearing part, realize guide plate and regenerate.
5. the method in lifting rolling mill guide according to claim 1 service life, is characterized in that:
Method guide plate being regenerated by the mode filling up wearing part with bead-welding technology is:
Casting 308 pure nickel welding electrode for cast iron of Φ 3.2 is preheated to 150 ~ 200 DEG C, roasting 1h; Be under the AC power of 70 ~ 120A at electric current, built-up welding is carried out to the abrading section of guide plate, and at heap postwelding hammering weld seam, to eliminate soldering district stress, Crack prevention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779086.2A CN104400316B (en) | 2014-12-15 | 2014-12-15 | A kind of method promoting rolling mill guide service life |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779086.2A CN104400316B (en) | 2014-12-15 | 2014-12-15 | A kind of method promoting rolling mill guide service life |
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| Publication Number | Publication Date |
|---|---|
| CN104400316A true CN104400316A (en) | 2015-03-11 |
| CN104400316B CN104400316B (en) | 2016-08-24 |
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| CN201410779086.2A Active CN104400316B (en) | 2014-12-15 | 2014-12-15 | A kind of method promoting rolling mill guide service life |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106181219A (en) * | 2016-08-16 | 2016-12-07 | 合肥东方节能科技股份有限公司 | A kind of high-performance finishing mill slitting wheel using method |
| CN109127731A (en) * | 2018-08-13 | 2019-01-04 | 林州凤宝管业有限公司 | A method of promoting rolling mill guide service life |
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| CN103981434A (en) * | 2014-05-28 | 2014-08-13 | 河南理工大学 | Preparation method for high-toughness nodular cast iron |
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| JPS57130714A (en) * | 1981-02-09 | 1982-08-13 | Nippon Steel Corp | Guiding device in hot rolling line |
| US4686345A (en) * | 1985-06-10 | 1987-08-11 | Oakes Grant A | Method of rebuilding a strip mill guide |
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| CN102181783A (en) * | 2011-04-29 | 2011-09-14 | 吉林大学 | High-strength ductile cast iron and manufacturing method thereof |
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| CN106181219A (en) * | 2016-08-16 | 2016-12-07 | 合肥东方节能科技股份有限公司 | A kind of high-performance finishing mill slitting wheel using method |
| CN109127731A (en) * | 2018-08-13 | 2019-01-04 | 林州凤宝管业有限公司 | A method of promoting rolling mill guide service life |
| CN109127731B (en) * | 2018-08-13 | 2019-10-22 | 林州凤宝管业有限公司 | A method of promoting rolling mill guide service life |
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| CN104400316B (en) | 2016-08-24 |
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Denomination of invention: A method to improve the service life of rolling mill guide plates Granted publication date: 20160824 Pledgee: Huishang Bank Co.,Ltd. Hefei Economic Development Zone sub branch Pledgor: HEFEI ORIENT ENERGY EFFICIENCY TECHNOLOGY Co.,Ltd. Registration number: Y2024980014914 |