CN101837501B - Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine - Google Patents
Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine Download PDFInfo
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Abstract
The invention relates to a surfacing method, in particular to a surfacing method of a 12-percent Cr steel high and middle pressure rotor journal of an ultra supercritical steam turbine, solving the problem of mechanical adhesive wear of the surfaces of the 12-percent Cr steel high and middle pressure rotor journal and a bearing. The surfacing method comprises the following steps of: firstly, respectively turning a first journal and a second journal of a blank rotor in a groove mode; secondly, carrying out dye inspection on a turning surface; thirdly, assembling the blank rotor to a special surfacing device; fourthly, preheating a surface to be surfaced of the rotor journal; fifthly, surfacing the surface to be surfaced; sixthly, distressing and heating a rotor; seventhly, turning and finishing the surfaced rotor; and eighthly, carrying out nondestructive inspection detection on the finished rotor. The surfacing method is used for surfacing the 12-percent Cr steel high and middle pressure rotor of the ultra supercritical steam turbine.
Description
Technical field
The present invention relates to a kind of overlaying method, particularly relate to a kind of supercritical turbine 12%Cr steel high pressure rotor journal overlaying method.
Background technology
Developing large-scale ultra supercritical unit and be the inevitable choice that China develops the clean coal power generation technology at present, is to improve generatine set heat efficiency, improve the environmental protection situation and optimize China's thermoelectricity installation structure reality, valid approach.12%Cr steel high pressure rotor will overcome a series of difficult problems in its manufacture process, especially the journal wear problem as the core component of ultra supercritical unit; When modified form 12%Cr steel that the supercritical turbine rotor is used and novel 12%Cr steel are applied to require the high pressure rotor of elevated temperature strength; Because its thermal conductivity factor is little, rotor promptly is known as the scorification phenomenon of mechanical wear at the easy sintering in surface at axle journal and bearing block perforation position; Cause the unusual vibrations of axle system, jeopardize unit safety.Before this, the 12%Cr steel high pressure rotor of China is from external directly purchase or after the foreign procurement rotor blank, recommits the built-up welding work that offshore company carries out axle journal, has seriously restricted the independent development capability of China's power technology.
Summary of the invention
The objective of the invention is to mismatch for the friction pair that the core component 12%Cr steel high pressure rotor journal that solves the ultra supercritical unit and bearing shell babbit form; At rotor journal and bearing surface position the problem of mechanical adhesive wear takes place, and then a kind of supercritical turbine 12%Cr steel high pressure rotor journal overlaying method is provided easily.
Technical scheme of the present invention is: a kind of supercritical turbine 12%Cr steel high pressure rotor journal overlaying method; The step of this method is following: step 1, the groove shape by drawing, size and fineness requirement are carried out groove turning processing respectively to first axle journal and second axle journal of blank rotor; With the turning datum level is that benchmark is confirmed the clutch shaft bearing center line; With the clutch shaft bearing center line is that the center turning length is the annular groove one of 432mm; Turning thickness 20mm, the both sides of annular groove one are processed with groove, obtain first and treat overlaying surface; With the second turning datum level B is that benchmark is confirmed the second bearing axis b, is that the left side turning length of middle mind-set second axle journal is the annular groove two of 202.5mm with the second bearing axis b, and turning thickness is 20mm; The left side of annular groove two is processed with groove; To the right side of second axle journal turning length is the annular groove three of 215.5mm, and turning thickness is 20mm, and the inboard turning thickness of shaft shoulder outer wall is 16.5mm; The turning rounding off of the shaft shoulder and the second axle journal junction obtains second and treats overlaying surface;
Step 2, will treat that overlaying surface and second treats that overlaying surface carries out dye penetrant inspection respectively, confirm that first treats that overlaying surface and second treats the have no effect defective of welding quality of the groove face of overlaying surface through first of the blank rotor after the step 1 turning;
Step 3, will not be assembled on the rotation system of rotor built-up welding special equipment through there being blank rotor influence welding quality defects after the step 2 dye penetrant inspection, this equipment guarantees to turn round in rotor weld deposit process coaxial;
Step 4, first of the blank rotor that assembles is treated that overlaying surface and second treats that the outer surface of overlaying surface carries out preheating, preheat temperature is 260 ℃～320 ℃, and programming rate is less than or equal to 25 ℃/h, temperature retention time 16h～18h;
Step 5, temperature after the step 4 preheating is reached first of 260 ℃～320 ℃ of scopes treat that overlaying surface and second treats that the groove of overlaying surface carries out built-up welding; Select the combination of EB2R welding wire and F55P4 solder flux for use; Adopt Lincoln weld method multiple-bead deposit; Starting the arc parameter: arcing time is 0.2S, and striking current is 500A, and arcing voltage is 40V; Receive the arc parameter: down slope time is 4S, and the crater filler time is 0.4S, and solder flux lags behind and stops; The prime coat welding condition: welding current is 300A～330A, and arc voltage is 26V～27V, and speed of welding is 250mm/min～260mm/min, and steplength is 8.0mm～10.0mm, and the speed of striding is 150mm/min～200mm/min; Built-up welding highly is 20mm, and wherein operation thickness and allowance respectively are 10mm, and the joint lap of splice is 2mm～3mm; Every layer of built-up welding floor height is 3mm～4mm, above-mentioned technological parameter is input to the control interface of rotor built-up welding special equipment after, make welding gun center line and first treat that overlaying surface and second treats that the surface of overlaying surface becomes 5 °～15 ° angles; Adjustment welding gun ignition tip to the first treats that overlaying surface or second treats that the distance of overlaying surface is 20mm～30mm, implements built-up welding, after the bottom built-up welding finishes; Under the non-stop condition of electric arc; Directly adjust the technological parameter in the rotor built-up welding special equipment: welding current is 360A～400A, and arc voltage is 28V～30V, and speed of welding is 280mm/min～300mm/min; Steplength is 10mm～12mm; Carry out 2～6 layers built-up welding, interlayer temperature is controlled at 260 ℃～380 ℃, obtains first overlaying surface and second overlaying surface;
Step 6, will carry out destressing heat treatment through the blank rotor after the step 5 built-up welding; Heat treatment process parameter: programming rate is less than or equal to 15 ℃/h; Holding temperature is 640 ℃～670 ℃, and temperature retention time is 6h, then the blank rotor is put into heat-treatment furnace and cools off; Be cooled to 150 ℃ with the speed that is less than or equal to 10 ℃/h, then stove is cold;
Step 7, will carry out turning fine finishining by the detail of design size respectively through first overlaying surface and second overlaying surface of the blank rotor after the step 6 destressing heat treatment.
The present invention has following beneficial effect: the present invention uses overlaying method to prevent the adhesion of axle journal and the generation of sintering failure phenomenon at the axle journal position of 12%Cr steel high pressure rotor; Guarantee the smooth operation of supercritical turbine group axle system, guarantee the safe operation of ultra supercritical generating set.Guaranteed the independent development production of our national ultra supercritical unit core component and core technology; Promote the development of domestic generation technology; Break away from the control and the restriction of offshore company; Minimizing relies on the technology of offshore company, promotes the ability that generating equipment is made in our national autonomous production, has expanded the space of China's generating equipment manufacturing independent development capability.The manufacturing cost of rotor journal built-up welding is to entrust 5～10% of offshore company's built-up welding cost, and has shortened manufacturing cycle, has increased economic benefit.
Description of drawings
Fig. 1 is the structural representation of blank rotor after step 1 among the present invention; Fig. 2 is the structural representation of blank rotor after step 7 among the present invention.
The specific embodiment
The specific embodiment one: combine Fig. 1 and Fig. 2 that this embodiment is described, this embodiment is realized through following steps:
Step 2, will treat that overlaying surface 1-1-1 and second treats that overlaying surface 1-2-1 carries out dye penetrant inspection respectively, confirm that first treats that overlaying surface 1-1-1 and second treats the have no effect defective of welding quality of the groove face of overlaying surface 1-2-1 through first of the blank rotor 1 after the step 1 turning;
Step 3, will not be assembled on the rotation system of rotor built-up welding special equipment (ZGD-5010 type rotor built-up welding machine) through there being the blank rotor 1 influence welding quality defects after the step 2 dye penetrant inspection, this equipment guarantees to turn round in rotor weld deposit process coaxial;
Step 4, first of the blank rotor 1 that assembles is treated that overlaying surface 1-1-1 and second treats that the outer surface of overlaying surface 1-2-1 carries out preheating, preheat temperature is 260 ℃～320 ℃, and programming rate is less than or equal to 25 ℃/h, temperature retention time 16h～18h;
Step 5, temperature after the step 4 preheating is reached first of 260 ℃～320 ℃ of scopes treat that overlaying surface 1-1-1 and second treats that the groove of overlaying surface 1-2-1 carries out built-up welding; (chemical composition of EB2R welding wire is seen table 2 to select the combination of EB2R welding wire and F55P4 solder flux for use; EB2R/F55P4 combination deposited metal composition is seen table 3; This is the chemical composition of welding wire and weld seam in the ASME standard), adopt Lincoln weld method multiple-bead deposit, starting the arc parameter: arcing time is 0.2S; Striking current is 500A, and arcing voltage is 40V; Receive the arc parameter: down slope time is 4S, and the crater filler time is 0.4S, and solder flux lags behind and stops.The prime coat welding condition: welding current is 300A～330A, and arc voltage is 26V～27V, and speed of welding is 250mm/min～260mm/min, and steplength is 8.0mm～10.0mm, and the speed of striding is 150mm/min～200mm/min; Built-up welding height 20mm, wherein operation thickness and allowance respectively are 10mm, and the joint lap of splice is 2mm～3mm, and every layer of built-up welding floor height is 3mm～4mm.After above-mentioned technological parameter being input to the control interface of rotor built-up welding special equipment (ZGD-5010 type rotor built-up welding machine); Make welding gun center line and first treat that overlaying surface 1-1-1 and second treats that the surface of overlaying surface 1-2-1 becomes 5 °～15 ° angles; Adjustment welding gun ignition tip to the first treats that overlaying surface 1-1-1 or second treats that the distance of overlaying surface 1-2-1 is 20mm～30mm, implements built-up welding.After the bottom built-up welding finishes; Under the non-stop condition of electric arc, directly adjust the technological parameter in the rotor built-up welding special equipment: welding current is 360A～400A, and arc voltage is 28V～30V; Speed of welding is 280mm/min～300mm/min; Steplength is 10mm～12mm, carries out 2～6 layers built-up welding, and interlayer temperature is controlled at 260 ℃～380 ℃.Obtain the first overlaying surface 2-1 and the second overlaying surface 2-2, little welding conditions are adopted in first floor built-up welding, can reduce dilution rate, keep the performance of overlay cladding to greatest extent;
Step 6, will carry out destressing heat treatment through the blank rotor after the step 5 built-up welding 1; Heat treatment process parameter: programming rate is less than or equal to 15 ℃/h; Holding temperature is 640 ℃～670 ℃, and temperature retention time is 6h, then blank rotor 1 is put into heat-treatment furnace and cools off; Be cooled to 150 ℃ with the speed that is less than or equal to 10 ℃/h, stove is cold;
Step 7, will carry out turning fine finishining by the detail of design size respectively through the first overlaying surface 2-1 and the second overlaying surface 2-2 of the blank rotor 1 after the step 6 destressing heat treatment.
The specific embodiment two: combine Fig. 1 and Fig. 2 that this embodiment is described, it also comprises step 8, and said step 8 will be carried out nondestructiving inspecting test through the first overlaying surface 2-1 and the second overlaying surface 2-2 of the blank rotor 1 after the step 7 turning fine finishining.(ultrasonic examination: do not have linear discontinuities and intensive circular flaw to show, the single circular flaw of φ＜3.0mm can be arranged; Surface seepage check: do not have linear discontinuities, the circular flaw of φ＜1.0mm can be arranged), other step is identical with the specific embodiment one with parameter.
The specific embodiment three: combine Fig. 1 and Fig. 2 that this embodiment is described; This embodiment is in the weld deposit process of step 5; In the built-up welding work time period intermittently, first of the still uncompleted blank rotor 1 of built-up welding is treated that overlaying surface 1-1-1 and second treats that overlaying surface 1-2-1 is in 260 ℃～320 ℃ insulations down of temperature.Because of the built-up welding workload is big, can not accomplish the built-up welding work of blank rotor 1 one end-journals a working day, stops built-up welding work evening; Proceed built-up welding second working day again; Through insulation, can prevent that crackle from appearring in built-up welding place, and then improve surfacing quality blank rotor 1.Other step is identical with the specific embodiment one or two with parameter.
The specific embodiment four: combine Fig. 1 and Fig. 2 that this embodiment is described; This embodiment is after the built-up welding work of step 5 is accomplished; Blank rotor 1 is incubated 2 hours for 300 ℃～360 ℃ in temperature; The first overlaying surface 2-1 place's rotor journal and the second overlaying surface 2-2 place rotor journal temperature that guarantee the blank rotor 1 after the built-up welding are even, and then six carry out destressing heat treatment set by step, and other step is identical with the specific embodiment one, two or three with parameter.
The specific embodiment five: combine Fig. 1 and Fig. 2 that this embodiment is described; In the step 1 of this embodiment; The diameter of the first axle journal 1-1 of blank rotor 1 is 490.06mm, and clutch shaft bearing center line a to the first turning datum level A is of a size of 874.0mm, and first after the turning treats that the diameter of overlaying surface 1-1-1 is 450.06mm; The diameter of the second axle journal 1-2 of blank rotor 1 is 450.14mm; The diameter of shaft shoulder 1-3 is 475mm, and right side to the second turning datum level B of the shaft shoulder is of a size of 1099mm, and second bearing axis b to the second turning datum level B is of a size of 829.0mm; After the turning second treats that the diameter of overlaying surface 1-2-1 is 410.14mm, and the diameter of shaft shoulder 1-3 is 475mm; In step 7, diameter is 470.06mm after the first overlaying surface 2-1 turning fine finishining after built-up welding is accomplished, and diameter is 430.14mm after the second overlaying surface 2-2 turning fine finishining, and other step is identical with the specific embodiment one, two, three or four with parameter.
Table 1
Table 2
Table 3
Claims (5)
1. supercritical turbine 12%Cr steel high pressure rotor journal overlaying method is characterized in that the step of this method is following:
Step 1, the groove shape by drawing, size and fineness requirement are carried out groove turning processing respectively to first axle journal (1-1) and second axle journal (1-2) of blank rotor (1); With the first turning datum level (A) is that benchmark is confirmed clutch shaft bearing center line (a); With clutch shaft bearing center line (a) is that the center turning length is the annular groove one of 432mm; Turning thickness 20mm, the both sides of annular groove one are processed with groove, obtain first and treat overlaying surface (1-1-1); With the second turning datum level (B) is that benchmark is confirmed second bearing axis (b); Is the annular groove two of 202.5mm with second bearing axis (b) for the left side turning length of middle mind-set second axle journal (1-2); Turning thickness is 20mm, and the left side of annular groove two is processed with groove, is the annular groove three of 215.5mm to the right side turning length of second axle journal (1-2); Turning thickness is 20mm; The inboard turning thickness of the shaft shoulder (1-3) outer wall is 16.5mm, and the turning rounding off of the shaft shoulder (1-3) and second axle journal (1-2) junction obtains second and treats overlaying surface (1-2-1);
Step 2, will treat that overlaying surface (1-1-1) and second treats that overlaying surface (1-2-1) carries out dye penetrant inspection respectively, confirm that first treats that overlaying surface (1-1-1) and second treats the have no effect defective of welding quality of the groove face of overlaying surface (1-2-1) through first of the blank rotor (1) after the step 1 turning;
Step 3, will not be assembled on the rotation system of rotor built-up welding special equipment through there being the blank rotor (1) influence welding quality defects after the step 2 dye penetrant inspection, this equipment guarantees to turn round in rotor weld deposit process coaxial;
Step 4, first of the blank rotor (1) that assembles is treated that overlaying surface (1-1-1) and second treats that the outer surface of overlaying surface (1-2-1) carries out preheating, preheat temperature is 260 ℃～320 ℃, and programming rate is less than or equal to 25 ℃/h, temperature retention time 16h～18h;
Step 5, temperature after the step 4 preheating is reached first of 260 ℃～320 ℃ of scopes treat that overlaying surface (1-1-1) and second treats that the groove of overlaying surface (1-2-1) carries out built-up welding; Select the combination of EB2R welding wire and F55P4 solder flux for use; Adopt Lincoln weld method multiple-bead deposit; Starting the arc parameter: arcing time is 0.2S, and striking current is 500A, and arcing voltage is 40V; Receive the arc parameter: down slope time is 4S, and the crater filler time is 0.4S, and solder flux lags behind and stops; The prime coat welding condition: welding current is 300A～330A, and arc voltage is 26V～27V, and speed of welding is 250mm/min～260mm/min, and steplength is 8.0mm～10.0mm, and the speed of striding is 150mm/min～200mm/min; Built-up welding highly is 20mm, and wherein operation thickness and allowance respectively are 10mm, and the joint lap of splice is 2mm～3mm; Every layer of built-up welding floor height is 3mm～4mm, above-mentioned technological parameter is input to the control interface of rotor built-up welding special equipment after, make welding gun center line and first treat that overlaying surface (1-1-1) and second treats that the surface of overlaying surface (1-2-1) becomes 5 °～15 ° angles; Adjustment welding gun ignition tip to the first treats that overlaying surface (1-1-1) or second treats that the distance of overlaying surface (1-2-1) is 20mm～30mm, implements built-up welding, after the bottom built-up welding finishes; Under the non-stop condition of electric arc; Directly adjust the technological parameter in the rotor built-up welding special equipment: welding current is 360A～400A, and arc voltage is 28V～30V, and speed of welding is 280mm/min～300mm/min; Steplength is 10mm～12mm; Carry out 2～6 layers built-up welding, interlayer temperature is controlled at 260 ℃～380 ℃, obtains first overlaying surface (2-1) and second overlaying surface (2-2);
Step 6, will carry out destressing heat treatment through the blank rotor (1) after the step 5 built-up welding; Heat treatment process parameter: programming rate is less than or equal to 15 ℃/h; Holding temperature is 640 ℃～670 ℃, and temperature retention time is 6h, then blank rotor (1) is put into heat-treatment furnace and cools off; Be cooled to 150 ℃ with the speed that is less than or equal to 10 ℃/h, stove is cold;
Step 7, will carry out turning fine finishining by the detail of design size respectively through first overlaying surface (2-1) and second overlaying surface (2-2) of the blank rotor (1) after the step 6 destressing heat treatment.
2. supercritical turbine 12%Cr steel high pressure rotor journal overlaying method according to claim 1; It is characterized in that: it also comprises step 8, and said step 8 will be carried out nondestructiving inspecting test through first overlaying surface (2-1) and second overlaying surface (2-2) of the blank rotor (1) after the step 7 turning fine finishining.
3. supercritical turbine 12%Cr steel high pressure rotor journal overlaying method according to claim 1; It is characterized in that: in the weld deposit process of step 5; In the built-up welding work time period intermittently, first of the still uncompleted blank rotor of built-up welding (1) is treated that overlaying surface (1-1-1) and second treats that overlaying surface (1-2-1) is incubated down for 260 ℃～320 ℃ in temperature.
4. according to claim 1,2 or 3 described supercritical turbine 12%Cr steel high pressure rotor journal overlaying methods, it is characterized in that: after the built-up welding work of step 5 is accomplished, blank rotor (1) is incubated 2 hours down for 300 ℃～360 ℃ in temperature.
5. according to claim 1,2 or 3 described supercritical turbine 12%Cr steel high pressure rotor journal overlaying methods; It is characterized in that: in step 1; The diameter of first axle journal (1-1) of blank rotor (1) is 490.06mm, and clutch shaft bearing center line (a) is of a size of 874mm to the first turning datum level (A), and first after the turning treats that the diameter of overlaying surface (1-1-1) is 450.06mm; The diameter of second axle journal (1-2) of blank rotor (1) is 450.14mm; The diameter of the shaft shoulder (1-3) is 475mm, and right side to the second turning datum level (B) of the shaft shoulder is of a size of 1099mm, and second bearing axis (b) to the second turning datum level (B) is of a size of 829.0mm; After the turning second treats that the diameter of overlaying surface (1-2-1) is 410.14mm; In step 7, diameter is 470.06mm after first overlaying surface (2-1) the turning fine finishining after built-up welding is accomplished, and diameter is 430.14mm after second overlaying surface (2-2) the turning fine finishining.
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| CN2010101774779A CN101837501B (en) | 2010-05-20 | 2010-05-20 | Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102052384B (en) * | 2010-10-27 | 2013-05-29 | 东方电气集团东方汽轮机有限公司 | Shaft of large-scale power generating machine and method for repairing surface of shaft neck |
| CN102071975A (en) * | 2010-12-13 | 2011-05-25 | 上海电气电站设备有限公司 | Welded rotor of single-cylinder steam turbine and welding method thereof |
| CN102152058B (en) * | 2011-05-11 | 2012-08-08 | 天津冶金集团重型机械制造有限公司 | Surfacing repair method for large cold-rolled supporting roll |
| CN102322297B (en) * | 2011-05-27 | 2014-07-02 | 上海电气电站设备有限公司 | Corrosion-resistant nuclear steam turbine rotor and machining method thereof |
| CN102287546A (en) * | 2011-08-02 | 2011-12-21 | 无锡杰尔压缩机有限公司 | Shaft neck and bearing part overlaying structure for valve shaft of water treatment plug valve |
| CN103357988B (en) * | 2012-03-31 | 2015-11-04 | 哈尔滨电机厂有限责任公司 | Axle class Precision Machining part damage defect welding repair method |
| CN103341684B (en) * | 2013-06-28 | 2016-01-20 | 四川蓝星机械有限公司 | The surface overlaying technique of minor diameter carbon steel, low-alloy steel, heat resisting steel cylindrical shell |
| CN104526170B (en) * | 2014-11-04 | 2016-11-02 | 南方增材科技有限公司 | Ultra supercritical High inter case electric smelting manufacturing process |
| CN104625606B (en) * | 2014-12-05 | 2017-11-07 | 东方电气集团东方汽轮机有限公司 | The stainless steel rotor forming method of small steam turbine |
| CN109909691A (en) * | 2019-04-04 | 2019-06-21 | 哈尔滨锅炉厂有限责任公司 | Bearing device inner wall overlaying manufacture of casing |
| CN110815504B (en) * | 2019-10-31 | 2022-01-14 | 佛山市石湾陶瓷工业研究所有限公司 | Processing technology of ceramic tile stamping die |
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| US4504554A (en) * | 1981-04-03 | 1985-03-12 | Hitachi, Ltd. | Rotor shaft of steam turbine |
| CN100999034A (en) * | 2007-01-10 | 2007-07-18 | 哈尔滨汽轮机厂有限责任公司 | Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction |
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| JPS59113977A (en) * | 1982-12-17 | 1984-06-30 | Toshiba Corp | Production of turbine rotor |
| JPH08144703A (en) * | 1994-11-18 | 1996-06-04 | Japan Steel Works Ltd:The | High-chromium turbine rotor and its manufacture |
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| US4504554A (en) * | 1981-04-03 | 1985-03-12 | Hitachi, Ltd. | Rotor shaft of steam turbine |
| CN100999034A (en) * | 2007-01-10 | 2007-07-18 | 哈尔滨汽轮机厂有限责任公司 | Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction |
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