CN1420200A - Method and apparatus for remelting surface coatings of large roll - Google Patents
Method and apparatus for remelting surface coatings of large roll Download PDFInfo
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- CN1420200A CN1420200A CN01139400A CN01139400A CN1420200A CN 1420200 A CN1420200 A CN 1420200A CN 01139400 A CN01139400 A CN 01139400A CN 01139400 A CN01139400 A CN 01139400A CN 1420200 A CN1420200 A CN 1420200A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 title claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims description 42
- 239000007789 gas Substances 0.000 claims description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 239000000567 combustion gas Substances 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 229910052895 riebeckite Inorganic materials 0.000 claims description 2
- 238000000137 annealing Methods 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 239000004744 fabric Substances 0.000 claims 1
- 238000004321 preservation Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 238000003672 processing method Methods 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 12
- 239000007921 spray Substances 0.000 description 10
- 238000003466 welding Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010289 gas flame spraying Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Coating By Spraying Or Casting (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
本发明涉及金属表面涂层的重熔方法及其重熔装置。重熔前的预热是以一环形或半环形均布、径向向心喷射的多束燃气火焰对辊面进行预热，预热时辊件匀速转动，火焰沿辊面匀速轴向移动，逐步地把辊面加热到500～550℃；重熔是以一环形均布、径向向心喷射的多束燃气火焰对辊面进行重熔，重熔从辊面一头开始，辊件在火环中转动，当辊面出现镜面时，火焰沿辊面轴向移动，其进给速度始终保持辊面涂层镜面。本发明加工方法和装置简单，热效率高，操作方便，安全可靠，工件重熔后的涂层外观平整、无裂纹，表现出良好的抗裂性能。
The invention relates to a method for remelting metal surface coatings and a remelting device thereof. The preheating before remelting is to preheat the roll surface with a ring or semi-ring evenly distributed and radially injected multiple beams of gas flames. During preheating, the roll rotates at a constant speed, and the flame moves axially along the roll surface at a constant speed. Gradually heat the roll surface to 500-550°C; remelting is to remelt the roll surface with a ring of uniformly distributed, radial and centripetal injection of multiple beams of gas flames. Rotating in the ring, when the mirror surface appears on the roller surface, the flame moves along the axial direction of the roller surface, and its feed speed always maintains the mirror surface of the roller surface. The processing method and device of the present invention are simple, high in heat efficiency, convenient in operation, safe and reliable, and the coating after remelting of the workpiece has smooth appearance and no cracks, and exhibits good anti-crack performance.
Description
Technical field
The present invention relates to the remelting method and the remelting apparatus thereof of coating for metal surfaces, particularly a kind of method and remelting apparatus thereof that large-scale straightening roller top coat is carried out remelting.
Background technology
At present, the straightening roller of continuous caster surface great majority are to adopt the method for built-up welding to make in the metallurgy industry, and resurfacing welding material is the Multipass No224-S1 tubular wire of selecting for use Si Taili to produce basically.Though the overlay cladding of this material has better heat-resisting fatigue property and red hardness energy, but under the bad working environment of straightening roller, still can produce bigger circumferential crack and longitudinal crack, also can become piece to come off sometimes, because condition of surface worsens, and has influenced ingot quality.For making roller can continue to use, must stop production roller is changed, crackle is ground off, change use again.
Self-fluxing alloy comprises Ni-basedly from holding alloy, cobalt base self-fluxing alloy and iron-based self-fluxing alloy, and their spray-welding coating has heat-resistant anti-fatigue performance and red hardness energy, under the situation of thermal fatigue, produces trickle map cracking, has discharged the thermal stresses on top layer effectively.These hair lines can not impact ingot casting.In addition, heat just arrives roll surface after by spray-welding coating, and it is less relatively that roll surface is subjected to thermal shocking, and top temperature descends relatively, and roll surface is difficult to cause be full of cracks, and therefore, people attempt to make the roll surface coating with the method for flame spray welding self-fluxing alloy.But for the Large Roller class, as continuous caster straightening roller, the alignment roller of straightener, and the conveying roller in the metallurgy industry etc., because volume big (most of between φ 200～φ 360mm), the surfacing area is also big, and with the not success of conventional method for spray-welding, its major cause is that the bulk temperature of roller does not reach due temperature.
Summary of the invention
The objective of the invention is to provide the remelting method and the remelting apparatus thereof of the surface coatings of large roll of a kind of save energy, production efficiency height, wide accommodation at the problems referred to above.
Remelting method of the present invention comprises the steps:
1) pair roller spare carries out preorder operations such as self-fluxing alloy spraying coating process;
2) utilize primary heater unit progressively roller spare surface to be heated to 500～550 ℃;
3) utilize one to have annular spread, the remelting combustion head of the multi beam gas flame that radial centripetal is sprayed carries out quick remelting from a beginning of roller spare pair roller spare surface, at this moment, the burner of remelting combustion head is 50～65mm to the distance on roller spare surface, roller spare rotates in the fire ring that the remelting combustion head produces, the remelting combustion head moves with the axle of uniform acceleration along roller spare under the drive of transmission rig, its speed that moves has minute surface and does not superfuse and be as the criterion to remain deep layer, and this moment, primary heater unit remained preheat mode, and near the temperature on the roller spare surface of remelting combustion head is remained on more than 300 ℃;
4) with woven asbesto roller spare is encased after remelting is finished and be incubated, prevent that roller spare from cracking.
Be other auxiliary heating unit of minimizing among the present invention, pair roller spare carries out preheating and also adopts flame to finish, wherein utilizing primary heater unit that roller spare surface is heated to 500～550 ℃ is to utilize to have with the same or similar structure of remelting combustion head, have annular or semi-circular distribution, preheating is carried out on the preheated burning head pair roller spare surface of the multi beam combustion flame that radial centripetal is sprayed, at this moment, the burner of preheated burning head is 80～120mm to the distance on roller spare surface, roller spare rotates in the fire ring that the preheated burning head produces, the speed of rotation is 16～18 rev/mins, the preheated burning head axially back and forth at the uniform velocity moves heat temperature raising to 500～550 ℃ gradually, roller spare surface along roller spare, and the preheating speed is with roller spare heat temperature raising to 500～550 ℃ in 60～120 ℃ of branch clock times.
According to the high power gas flame remolten device of the inventive method design, pair roller spare comprises that also the small power flame with the remelting combustion head carries out once the simply step of anneal to whole roller spare after carrying out remelting and finish with the high-power flame of remelting combustion head.
For obtaining preferable fuel gas injection effect, the injector that is adopted has spray jet, mixing tube and convergent divergent channel structure, and spray jet is positioned at the mixing tube front end, and mixing tube is terminal to be connected with convergent divergent channel, the periphery of spray jet is the hydraucone of convergent, and this hydraucone is terminal to be connected with the mixing tube front end.When combustion gas and oxygen were transported to the injector of burner by housing, oxygen was entered by spray jet, and combustion gas is entered by the aforementioned hydraucone of injector, and this bell-mouthed effect is to reduce the resistance that combustion gas enters injector.Gas is at the pressure at the hydraucone place pressure greater than the spray jet exit, and this pressure difference is big more, and the combustion gas soakage is then big more, and burner is difficult for tempering when work.Combustion gas and oxygen enter in the mixing tube of injector and mix, and its effect is to make the speed of oxygen and combustion gas be tending towards even.Also can make gradually-reducing shape to mixing tube, it is even so more to help speed.Then, the mixed gas of oxygen, combustion gas enters convergent divergent channel, and when mixed gas flow through convergent divergent channel, flow velocity further reduced, kinetic head changes statical head into, utilize the static pressure of outlet, make the gas mixture physical efficiency continue to overcome resistance, flow along pipeline, last mixed gas enters the combustion head air chamber, enter atmospheric combustion by burner again, the ejection of flame radial centripetal forms a uniform fire ring or half fire ring.
Apparatus of the present invention acetylene simple in structure, easy to operate, safe and reliable, available, propylene, propane are made fuel; Can process large-diameter workpiece, the length of workpiece is not particularly limited.
But gas flow housing teletype control gas flow by the control of housing to flame power, can be easy to satisfy the remelting processing requirement.
The preheating of roller spare is to finish with flame, does not need other complementary heating, heats as resistance furnace.
Because flame is annular or semi-circular, and roller spare is that screwfeed is heated with respect to fire ring, thereby workpiece circumferentially is heated evenly, the thermo-efficiency height, workpiece heats up very fast, thereby has saved the energy.
According to the coating after the invention process remelting, flat appearance, flawless, in actual use, tiny map cracking appears in the surface, shows the better cracking resistance energy.
Below in conjunction with the embodiment accompanying drawing the inventive method and apparatus structure are described further.
Description of drawings
Fig. 1 is apparatus of the present invention structural representation;
Fig. 2 is apparatus of the present invention emitter construction synoptic diagram;
Fig. 3 is apparatus of the present invention annular firing header structure synoptic diagram;
Fig. 4 is the burner structural representation of apparatus of the present invention;
Fig. 5 is the control device structural representation of apparatus of the present invention oxygen, combustion gas and water coolant;
Fig. 6 is apparatus of the present invention user mode synoptic diagram.
Embodiment
Apparatus of the present invention have first burner that preheating, remelting use, second burner, the gas flow housing 1 that auxiliary preheating is used.First burner is made up of gas injector 2 and annular firing head 3, and annular firing head 3 matrixes are made by pipe fitting, and its inner chamber is divided into outer ring 301 and inner ring 302, and outer ring 301 is that burning gas gas stops up, and inner ring 302 is cooling-water ducts.Each mouth seat 303 of 24 burners circumferentially is welded in uniform way outer ring 301 is communicated with the external world, and burner 304 is contained on the burner seat 303, and radially towards annular firing head 3 centers.Gas injector 2 has spray jet 201, mixing tube 202 and convergent divergent channel 203 structures, spray jet 201 is positioned at mixing tube 202 front ends, mixing tube 202 ends are connected with convergent divergent channel 203, and spray jet 201 peripheries are the hydraucone 204 of convergent, and it is connected with mixing tube 202 front ends.Contiguous block 4 is connected gas injector 2, inlet channel 5, outlet conduit 6 with annular firing head 3.The quantity of burner 304 is generally 12～24, and present embodiment adopts 24.
Second burner is made up of gas injector and semi-circular combustion head, its gas injector is identical with gas injector 2 structures of aforementioned first burner, semi-circular combustion head matrix is also made by pipe fitting, structure and annular firing head 3 are similar, in it on half-turn radial centripetal be evenly equipped with 12 burners 801, its cooling-water duct turns along semi-ring from the semi-ring end and gets back on its contiguous block.Be sequentially set with stopping valve 901, gas-pressure meter 902, gas flow regulating valve 903, gas meter 904, electromagnetic switch valve 905 and check valve 906 in the gas flow housing 1 on the oxygen control device 9 of first burner; Be sequentially set with stopping valve 1001, gas-pressure meter 1002, gas flow regulating valve 1003, gas meter 1004, electromagnetic switch valve 1005 on the controller for gas 10 of first burner and prevent temper device 1006; Recirculated cooling water pilot piping 11 also is arranged in the housing 1, is provided with stopping valve 1101 and electromagnetic switch valve 1102 in this pilot piping.The structure of the oxygen control device of second burner, controller for gas and recirculated cooling water pilot piping and first burner is identical in the housing 1.Pick out oxygen channel, gas pipeline, inlet channel, the outlet conduit of oxygen channel, gas pipeline, cooling water inlet pipe road, outlet conduit and second burner of first burner respectively from gas flow housing 1.
The remelting workpiece is the straightening roller of continuous caster, and this straightening roller is the new roller of 15CrMO, and diameter is φ 318.82mm.The cleaning of straightening roller, alligatoring all are to carry out with ordinary method, and dusty spray is a Ni60 powder of selecting for use Shanghai Si Taili company to produce, and granularity is-150～+ 320 orders, with conventional gas flame spraying method roll surface are sprayed, and coat-thickness is 1.1mm.
The flow of gas flow housing oxygen, combustion gas is 2.5m
3/ h～15m
3/ h is adjustable.
During work, straightening roller 21 is rotated by mechanical transmission, semi-circular combustion head is preceding, the annular firing head is driven and can be moved axially along roll surface by a motor-driven seat outside afterwards being enclosed within straightening roller 21 circumference and respectively, the burner of annular firing head is 50～65mm to the distance of roll surface, and the burner of semi-circular combustion head to the distance of roll surface is 100mm.The remelting of roller top coat can utilize the power support of operation self-fluxing alloy spraying to drive the rotation of straightening roller and drive two combustion heads and move axially.
Roller spare rotating speed: 16～18 rev/mins
Used combustion gas is that purity is that 99% propylene or purity are 98% acetylene, and used oxygen is industrial oxygen.
The remelting method of roller spare top coat is performed such:
At first be with annular firing head 3, carry out preheating with small power flame pair roller spare 21,21 uniform rotation of roller spare, annular firing head 3 at the uniform velocity axially moves back and forth in whole remelting length range along roll surface, and the whole workpiece surface temperature is slowly raise;
When being elevated to 150 ℃, progressively add big flame power, so that workpiece temperature continues to raise;
When roll surface temperature was elevated to 300 ℃, preheating flame only at the uniform velocity moved back and forth in workpiece half segment limit and heats;
Along with the rising of temperature, the preheating flame heated perimeter progressively dwindles to workpiece one end;
At last, make the surface temperature of about 1/3rd segment limits of workpiece reach 500～550 ℃.
Whole warm was finished in the scope at 120～130 minutes.The temperature of workpiece is monitored with infrared thermometer.
Workpiece continues uniform rotation.
And then, begin to strengthen the flame power of annular combustion head 3, begin pair roller spare surface from an end of workpiece and carry out remelting, its watt level minute surface occurred by the remelting coating and is as the criterion making at short notice;
After seeing minute surface, begin mobile remelting flame and advance, its speed of feed remains roller spare surface in whole reflow process the coating minute surface;
When remelting began, semi-circular combustion head back and forth at the uniform velocity moved axially the heated parts surface before annular firing head 3, and the temperature of not remelting part is remained on more than 300 ℃.
After remelting finishes, with small power flame the remelting workpiece is made once simple anneal with annular firing head 3.
At last the 21 usefulness woven asbestos of the roller after the remelting are wrapped insulation, when its temperature is reduced to 100 ℃, end.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011394005A CN1179064C (en) | 2001-11-16 | 2001-11-16 | Remelting method and remelting device of large roller surface coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011394005A CN1179064C (en) | 2001-11-16 | 2001-11-16 | Remelting method and remelting device of large roller surface coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1420200A true CN1420200A (en) | 2003-05-28 |
| CN1179064C CN1179064C (en) | 2004-12-08 |
Family
ID=4675236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011394005A Expired - Fee Related CN1179064C (en) | 2001-11-16 | 2001-11-16 | Remelting method and remelting device of large roller surface coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1179064C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776031A (en) * | 2012-10-23 | 2014-05-07 | 林德股份公司 | Multi-flame burner and method for heating a workpiece |
| CN104947104A (en) * | 2015-07-10 | 2015-09-30 | 吴忠仪表有限责任公司 | Flame remelting device for valve ball core |
| CN106835003A (en) * | 2017-03-30 | 2017-06-13 | 徐工集团工程机械有限公司 | Remelting apparatus |
| CN107400768A (en) * | 2017-08-17 | 2017-11-28 | 安徽卓煌机械设备有限公司 | A kind of manufacture of cement pressure roller roll surface built-up welding flame pre-heating system |
| CN109112270A (en) * | 2018-09-30 | 2019-01-01 | 扬州市管件厂有限公司 | Synchronous adjustment formula multi-port flame heating quenching device |
| CN111570966A (en) * | 2020-06-03 | 2020-08-25 | 大连华锐重工特种备件制造有限公司 | High-power remelting ring for flame spray welding and assembling method thereof |
| CN111979542A (en) * | 2020-08-06 | 2020-11-24 | 江苏科环新材料有限公司 | High-frequency remelting coating preparation device for boiler pipe of garbage power station under composite motion condition |
| WO2024119945A1 (en) * | 2022-12-08 | 2024-06-13 | 安徽马钢表面技术股份有限公司 | Spray welding remelting device and spray welding remelting method for elongated solid roller |
-
2001
- 2001-11-16 CN CNB011394005A patent/CN1179064C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776031A (en) * | 2012-10-23 | 2014-05-07 | 林德股份公司 | Multi-flame burner and method for heating a workpiece |
| CN104947104A (en) * | 2015-07-10 | 2015-09-30 | 吴忠仪表有限责任公司 | Flame remelting device for valve ball core |
| CN106835003A (en) * | 2017-03-30 | 2017-06-13 | 徐工集团工程机械有限公司 | Remelting apparatus |
| CN106835003B (en) * | 2017-03-30 | 2022-06-07 | 徐工集团工程机械有限公司 | Remelting device |
| CN107400768A (en) * | 2017-08-17 | 2017-11-28 | 安徽卓煌机械设备有限公司 | A kind of manufacture of cement pressure roller roll surface built-up welding flame pre-heating system |
| CN107400768B (en) * | 2017-08-17 | 2019-04-16 | 惠州市光大水泥企业有限公司 | A kind of manufacture of cement pressure roller roll surface built-up welding flame pre-heating system |
| CN109112270A (en) * | 2018-09-30 | 2019-01-01 | 扬州市管件厂有限公司 | Synchronous adjustment formula multi-port flame heating quenching device |
| CN111570966A (en) * | 2020-06-03 | 2020-08-25 | 大连华锐重工特种备件制造有限公司 | High-power remelting ring for flame spray welding and assembling method thereof |
| CN111570966B (en) * | 2020-06-03 | 2024-03-15 | 大连华锐重工特种备件制造有限公司 | High-power remelting ring for flame spray welding and assembly method thereof |
| CN111979542A (en) * | 2020-08-06 | 2020-11-24 | 江苏科环新材料有限公司 | High-frequency remelting coating preparation device for boiler pipe of garbage power station under composite motion condition |
| WO2024119945A1 (en) * | 2022-12-08 | 2024-06-13 | 安徽马钢表面技术股份有限公司 | Spray welding remelting device and spray welding remelting method for elongated solid roller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1179064C (en) | 2004-12-08 |
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