CN105154874A - Laser-cladding repairing process for pump shaft of nuclear power station - Google Patents
Laser-cladding repairing process for pump shaft of nuclear power station Download PDFInfo
- Publication number
- CN105154874A CN105154874A CN201510596216.3A CN201510596216A CN105154874A CN 105154874 A CN105154874 A CN 105154874A CN 201510596216 A CN201510596216 A CN 201510596216A CN 105154874 A CN105154874 A CN 105154874A
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- China
- Prior art keywords
- pump shaft
- laser
- cladding
- described pump
- flaw detection
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
Abstract
The invention discloses a laser-cladding repairing process for a pump shaft of a nuclear power station. The laser-cladding repairing process comprises the following steps: S1, determining the bending part of the pump shaft; S2, using high-energy laser to scan convex points at the bending part of the pump shaft, monitoring the pointer of a dial indicator and stopping laser scanning when the curvature of the pump shaft starts to stretch to the original position; S3, determining whether the pump shaft needs to be straightened, and removing a fatigue layer on the part, requiring treatment, on the pump shaft; S4, after determining that the damage surface of the pump shaft is free of abrasion scars, wiping off a flaw detection agent, repeatedly wiping off the flaw detection agent, which is not wiped off, with acetone, and cleaning the surface of the pump shaft by the low-power mode of a laser; and S5, performing laser cladding of the pump shaft till completion of cladding. According to the process, the pump shaft is straightened by laser and repaired by laser cladding, the operation is simple, the controllability of the implementation process is greatly improved in comparison with a method in the prior art, and the laser cladding material and substrate binding force of laser cladding is better than that of a traditional method.
Description
Technical field
The present invention relates to a kind of Nuclear power plants pump shaft laser cladding repair technique.
Background technology
The development of nuclear industry; and the severity of nuclear industry standard largely constrains the use of various accessory; so to be nuclear energy power generation topmost the life-span of accessory; if operational outfit is shut down just mean power loss and financial loss; pump shaft is the topmost consumable part of nuclear energy power generation; owing to generally will ensure that the generating set more than ten years do not shut down, the rub proofness of pump shaft and corrosion-resistant degree will be ensured like this.Again because these pump shafts belong to customization part, general production firm can not produce according to order, so do not have unnecessary spare parts supply yet, so the pump of nuclear power plant, except pump shaft damages, miscellaneous part is good, if a set of pump changes price comparison costliness entirely, so pump shaft can select the mode of repairing with cost-saving.
The principal mode that pump shaft damages and reason:
(1) reason that bending shaft mostly occurs is: rotor dynamic balancing is excessive, rotor oscillation, and pump foundation levelness is overproof.For horizontal type multi-stage pump, be mostly that the span centre caused due to jiggering is not in time sagging, the distortion that the rotor top and the bottom temperature difference causes, rotor unbalance dynamic is excessive, centering departs from the vibration caused.
(2) wearing and tearing mostly are that adjoint bending shaft produces, and cross pine or bearing damage in addition and the wearing and tearing that cause also often occur at bearing diameter of axle position due to bearing inner race.
Repair bending pump shaft and have following several method:
(1) alignment method is heated: with acetylene flame heated mandrel local, expanded because being heated by the region of heating, but cold-zone around limits again its expansion because of the rigidity of self.Therefore, hot-zone is squeezed, and after cooling, hot-zone volume shrinks again, thus pulls peripheral region to shrink.This creates the terminal reverse bending, compensate for original amount of bow, thus reach the object of alignment.Heat input is large, is difficult to control, and the danger of acetylene is larger.
(2) cold press process: at normal temperatures, the convex surface bending from axle class applies external force, and the two sides of axle produces stress δ pressure respectively and tensile stress δ draws, when δ pressure=δ s or δ draw=δ s time, the local of axle will viscous deformation, thus compensates bend contrary with original direction.This method does not thoroughly solve unrelieved stress, probably in use afterwards, reverts to bending.
The restorative procedure of pump shaft wearing and tearing and feature:
(1) built-up welding
Repair layer thickness is 0.3 ~ 3mm, and intensity is 300 ~ 450MPa, and bonding strength is 300--mono-450MPa, and hardness value is 210 ~ 420HB, and this is conventional restorative procedure.But heat input is too large, be difficult in actually operating control.
(2) chromium plating
Repair layer thickness is 0.1 ~ 0.3mm, intensity own is 400-600MPa, and bonding strength is 300MPa, and hardness is 800-1000HB, be applicable to the place that amount of friction is less, surface hardness requirement is higher, be applicable to stuffing box position and the sliding surface bearing axle journal position of axle class.The thickness repaired can not reach actual operation requirements sometimes.
(3) thermospray
Repairing thickness is 0.05 ~ 10mm, and intensity own is 80 ~ 110MPa, and bonding strength is 40 ~ 95MPa, and hardness is 200-240HB.Feature: intensity is too low, hardness and surface quality may be undesirable.
(4) bushing patching
Axle sleeve is generally formed by stainless steel plate, iron plate rolling or is made up of foundry goods turning.Be inlaid with overall cover and two kinds, half cover.One end that overall cover is applicable to axle is less than the situation of sleeve diameter.After axle sleeve and pump shaft processing parts being coordinated, put by axle sleeve in people's machine oil and heat, after axle sleeve expanded by heating, while hot by one end cover people pump shaft of axle sleeve from axle, main shaft held tightly by cooling rear axle housing, then by axle journal turning to specified dimension and smooth finish.Half cover is comparatively applicable to the pump shaft situation identical with axle sleeve external diameter.Journal wear place is lathed the dark groove of 2 ~ 5mm, stainless steel sleeve opens El joint-cutting by calculated size, and then with oxygen and acetylene flame baking, hand hammer knocks axle sleeve, makes it to be close to be fixed in groove, then seam is welded with stainless steel electrode, carries out turning again after cooling.Shortcoming is that actually operating bothers very much.
Summary of the invention
The technical problem to be solved in the present invention is the defect overcoming prior art, provides a kind of Nuclear power plants pump shaft laser cladding repair technique.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A kind of Nuclear power plants pump shaft of the present invention laser cladding repair technique, it comprises the following steps:
S1, from pump, take out pump shaft, described pump shaft is arranged on lathe, use dial gauge to carry out playing table to described pump shaft, detect every related data, determine the crooked position of pump shaft;
S2, the salient point of use superlaser to described pump shaft crooked position scan, indicator bracket is in the concave point position of described pump shaft, laser transmitter grasps scanning area and speed by mechanical manipulator, monitor the pointer of dial gauge, when pump shaft sinuousness starts oneself to be stretched to original position, stop laser scanning; The general HRC < 35 of initial hardness of nuclear power pump shaft material, after the scanning through laser, the scanning position of material has strengthening, and hardness improves, and this strengthening can not affect pump shaft use afterwards.
S3, determine described pump shaft aligned or itself do not need align, described pump shaft will be determined fatigue layer removal is carried out at position to be processed, be removed to described pump shaft surface without wear scar;
S4, confirm that the damage surface of described pump shaft does not have wear scar with penetrant inspection agent after, flaw detection agent is wiped out, with acetone by the many wipings of flaw detection agent do not wiped several times, and first with the low-power mode of laser apparatus, pump shaft surface laser is cleared up, vestiges can be fallen by vaporization at high temperature, guarantee that surface remains without flaw detection agent;
S5, to mechanical manipulator programming, laser transmitter hot spot is aimed at pump shaft and repairs position, open laser apparatus and powder feeder starts to carry out laser melting coating to pump shaft, until cladding completes;
S6, cooling pump shaft, and remove mechanical manipulator, uses lathe that roughing is carried out in cladding face, and when car falls surface size many 0.05mm, whether described pump shaft surface has pore or crackle and other defect to use penetrant inspection agent to determine;
S7, determine there is no other defect, continue to use lathe by additional 0.05mm precision work process to predetermined size, and with husky mulberry paper sanding and polishing to predetermined roughness.
Further, in step sl, every related data of detection comprises concentricity, deviation and beats.
The beneficial effect that the present invention reaches is:
Technique of the present invention, laser aligning pump shaft and laser melting coating is used to repair pump shaft, simple to operate, to the laser application that pump shaft aligning and resizing relate to, energy input amount is little, implementation process controllability improves greatly than the method for prior art, and the cladding of laser is better than the bonding force of traditional method cladding material and base material.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
A kind of Nuclear power plants pump shaft of the present invention laser cladding repair technique, it comprises the following steps:
S1, from pump, take out pump shaft, described pump shaft is arranged on lathe, use dial gauge to carry out playing table to described pump shaft, detect every related data, determine the crooked position of pump shaft;
S2, the salient point of use superlaser to described pump shaft crooked position scan, indicator bracket is in the concave point position of described pump shaft, laser transmitter grasps scanning area and speed by mechanical manipulator, monitor the pointer of dial gauge, when pump shaft sinuousness starts oneself to be stretched to original position, stop laser scanning; The general HRC < 35 of initial hardness of nuclear power pump shaft material, after the scanning through laser, the scanning position of material has strengthening, and hardness improves, and this strengthening can not affect pump shaft use afterwards.
S3, determine described pump shaft aligned or itself do not need align, described pump shaft will be determined fatigue layer removal is carried out at position to be processed, be removed to described pump shaft surface without wear scar;
S4, confirm that the damage surface of described pump shaft does not have wear scar with penetrant inspection agent after, flaw detection agent is wiped out, with acetone by the many wipings of flaw detection agent do not wiped several times, and first with the low-power mode of laser apparatus, pump shaft surface laser is cleared up, vestiges can be fallen by vaporization at high temperature, guarantee that surface remains without flaw detection agent;
S5, to mechanical manipulator programming, laser transmitter hot spot is aimed at pump shaft and repairs position, open laser apparatus and powder feeder starts to carry out laser melting coating to pump shaft, until cladding completes;
S6, cooling pump shaft, and remove mechanical manipulator, uses lathe that roughing is carried out in cladding face, and when car falls surface size many 0.05mm, whether described pump shaft surface has pore or crackle and other defect to use penetrant inspection agent to determine;
S7, determine there is no other defect, continue to use lathe by additional 0.05mm precision work process to predetermined size, and with husky mulberry paper sanding and polishing to predetermined roughness.
In step sl, every related data of detection comprises concentricity, deviation and beats.
Technique of the present invention, laser aligning pump shaft and laser melting coating is used to repair pump shaft, simple to operate, to the laser application that pump shaft aligning and resizing relate to, energy input amount is little, implementation process controllability improves greatly than the method for prior art, and the cladding of laser is better than the bonding force of traditional method cladding material and base material.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a Nuclear power plants pump shaft laser cladding repair technique, is characterized in that, comprises the following steps:
S1, from pump, take out pump shaft, described pump shaft is arranged on lathe, use dial gauge to carry out playing table to described pump shaft, detect every related data, determine the crooked position of pump shaft;
S2, the salient point of use superlaser to described pump shaft crooked position scan, indicator bracket is in the concave point position of described pump shaft, laser transmitter grasps scanning area and speed by mechanical manipulator, monitor the pointer of dial gauge, when pump shaft sinuousness starts oneself to be stretched to original position, stop laser scanning;
S3, determine described pump shaft aligned or itself do not need align, described pump shaft will be determined fatigue layer removal is carried out at position to be processed, be removed to described pump shaft surface without wear scar;
S4, confirm that the damage surface of described pump shaft does not have wear scar with penetrant inspection agent after, flaw detection agent is wiped out, with acetone by the flaw detection agent wiping do not wiped some times, and first with the low-power mode of laser apparatus, pump shaft surface laser is cleared up, vestiges can be fallen by vaporization at high temperature, guarantee that surface remains without flaw detection agent;
S5, to mechanical manipulator programming, laser transmitter hot spot is aimed at pump shaft and repairs position, open laser apparatus and powder feeder starts to carry out laser melting coating to pump shaft, until cladding completes;
S6, cooling pump shaft, and remove mechanical manipulator, uses lathe that roughing is carried out in cladding face, car fall surface size at the most 0.05mm time, whether described pump shaft surface has pore or crackle and other defect to use penetrant inspection agent to determine;
S7, determine there is no other defect, continue to use lathe by additional 0.05mm precision work process to predetermined size, and with husky mulberry paper sanding and polishing to predetermined roughness.
2. a kind of Nuclear power plants pump shaft laser cladding repair technique according to claim 1, is characterized in that, in step sl, every related data of detection comprises concentricity, deviation and beats.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510596216.3A CN105154874A (en) | 2015-09-17 | 2015-09-17 | Laser-cladding repairing process for pump shaft of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510596216.3A CN105154874A (en) | 2015-09-17 | 2015-09-17 | Laser-cladding repairing process for pump shaft of nuclear power station |
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| CN105154874A true CN105154874A (en) | 2015-12-16 |
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| CN201510596216.3A Pending CN105154874A (en) | 2015-09-17 | 2015-09-17 | Laser-cladding repairing process for pump shaft of nuclear power station |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105965203A (en) * | 2016-07-20 | 2016-09-28 | 嘉兴翰德圣激光再制造技术有限公司 | Bearing seat repairing technology of vacuum pump shaft |
| CN106141561A (en) * | 2016-07-20 | 2016-11-23 | 嘉兴翰德圣激光再制造技术有限公司 | A kind of renovation technique of multistage pump pump shaft |
| CN106166660A (en) * | 2016-07-20 | 2016-11-30 | 嘉兴翰德圣激光再制造技术有限公司 | A kind of smooth shaft online renovation technique of abrasion |
| CN107419262A (en) * | 2017-07-05 | 2017-12-01 | 嘉兴翰德圣激光再制造技术有限公司 | Universal express pump gear shaft terminal odontotripsis or crackle laser melting coating restorative procedure |
| CN111593343A (en) * | 2020-06-10 | 2020-08-28 | 中国航发北京航空材料研究院 | Process method for repairing flap slide rail chromium plating surface chipping defect by laser cladding |
| CN111781043A (en) * | 2020-07-09 | 2020-10-16 | 江苏隆达超合金航材有限公司 | Sample preparation method for measuring oxygen content of nickel-based superalloy |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105965203A (en) * | 2016-07-20 | 2016-09-28 | 嘉兴翰德圣激光再制造技术有限公司 | Bearing seat repairing technology of vacuum pump shaft |
| CN106141561A (en) * | 2016-07-20 | 2016-11-23 | 嘉兴翰德圣激光再制造技术有限公司 | A kind of renovation technique of multistage pump pump shaft |
| CN106166660A (en) * | 2016-07-20 | 2016-11-30 | 嘉兴翰德圣激光再制造技术有限公司 | A kind of smooth shaft online renovation technique of abrasion |
| CN107419262A (en) * | 2017-07-05 | 2017-12-01 | 嘉兴翰德圣激光再制造技术有限公司 | Universal express pump gear shaft terminal odontotripsis or crackle laser melting coating restorative procedure |
| CN107419262B (en) * | 2017-07-05 | 2019-03-08 | 浙江翰德圣智能再制造技术有限公司 | Universal express pump gear shaft terminal odontotripsis or crackle laser melting coating restorative procedure |
| CN111593343A (en) * | 2020-06-10 | 2020-08-28 | 中国航发北京航空材料研究院 | Process method for repairing flap slide rail chromium plating surface chipping defect by laser cladding |
| CN111781043A (en) * | 2020-07-09 | 2020-10-16 | 江苏隆达超合金航材有限公司 | Sample preparation method for measuring oxygen content of nickel-based superalloy |
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Application publication date: 20151216 |