CN113913807A - Laser repairing method for CTA (CTA) pressure filter drum - Google Patents
Laser repairing method for CTA (CTA) pressure filter drum Download PDFInfo
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- CN113913807A CN113913807A CN202010661096.1A CN202010661096A CN113913807A CN 113913807 A CN113913807 A CN 113913807A CN 202010661096 A CN202010661096 A CN 202010661096A CN 113913807 A CN113913807 A CN 113913807A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 44
- 238000005253 cladding Methods 0.000 claims abstract description 35
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 238000004372 laser cladding Methods 0.000 claims abstract description 13
- 230000008439 repair process Effects 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 230000007547 defect Effects 0.000 claims description 42
- 239000000835 fiber Substances 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000000151 deposition Methods 0.000 claims description 12
- 230000008021 deposition Effects 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000010790 dilution Methods 0.000 abstract description 11
- 239000012895 dilution Substances 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 4
- 239000000155 melt Substances 0.000 abstract 1
- 239000002904 solvent Substances 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 239000012065 filter cake Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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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
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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Abstract
The invention relates to a CTA pressure filter rotary drum laser repairing method, which utilizes laser cladding to repair the CTA pressure filter rotary drum, rapidly heats and melts the surface of a substrate and added alloy powder under the action of heat to form a metallurgical bonding surface cladding layer with extremely low dilution rate, adopts a laser cladding process to repair the CTA pressure filter rotary drum, has small heat input, heat affected zone and distortion due to rapid heating and rapid cooling of laser, can avoid the deformation of the CTA pressure filter rotary drum, has the cladding layer dilution rate less than 5 percent, is in firm metallurgical bonding with the substrate, and can obtain a good cladding layer with controllable cladding layer components and dilution rate.
Description
Technical Field
The invention relates to the technical field of laser welding processes, in particular to a rotary drum laser repairing method for a CTA (polyethylene terephthalate) pressure filter.
Background
PTA is the main raw material for producing polyester fiber, resin, film and container resin, and is widely applied to the fields of chemical fiber, container, packaging, film production and the like. In recent years, the PTA process is rapidly developed, and a solvent exchange technology is rapidly developed, so that the filtering, drying and pneumatic transmission and storage of CTA of a PTA oxidation device can be simplified into a solvent exchange unit to complete; the CTA solvent exchange technology adopts a countercurrent multistage washing process, clean washing liquid enters a solvent exchanger from the last stage of washing area, the solvent is discharged into a chamber corresponding to a control head through a filtrate pipe after the solvent exchange is finished, and then is discharged into a corresponding filtrate tank, filtrate in the filtrate tank enters a first stage of washing area on the solvent exchanger through a pump to continue the solvent exchange, and the solvent is washed forward step by step in sequence in a manner opposite to the flowing direction of a filter cake, namely the multistage countercurrent filtering and washing solvent exchange technology of a pressure filter. The long-term operation contact of the filter leads to more serious abrasion between the inner rotary drum and the isolating block, leads to the incomplete isolation of the isolating piece, seriously influences the normal production and consumption of the device, and brings potential safety hazard and economic loss to the normal production of enterprises. If the drum replacement mode is adopted, a overhaul program needs to be started, and millions of expenses are consumed for product cost, shutdown period and the like. The adoption of the repairing method can not only save the shutdown period, but also improve the wear resistance on the original material performance.
The rotary drum adopts a stainless steel welding structure, as shown in figure 1, the rotary drum 1 is welded and fixed by a plurality of stainless steel circumferential rib plates 3 and a plurality of axial rib plates 4 to form a cage-shaped structure with a plurality of filtering chambers 2, rib plate joints 5 are formed at the intersection parts of the circumferential rib plates 3 and the axial rib plates 4, and drainage pipelines 6 are arranged in the rotary drum 2. The normal repair process is adopted to repair the rotary drum of the CTA pressure filter, and the rotary drum of the CTA pressure filter is deformed due to overhigh heat input, and the performance of the body structure is changed. The design of a rotary drum laser repair method of a CTA pressure filter, which can avoid deformation and has a cladding layer dilution rate less than 5 percent, is a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to solve the technical problem of providing a rotary drum laser repairing method of a CTA (CTA) pressure filter, which can avoid deformation and has a cladding layer dilution rate less than 5%.
In order to solve the technical problem, the laser repair method for the rotary drum of the CTA pressure filter provided by the invention comprises the following steps:
A. cleaning and detecting the size of the CTA pressure filter drum, and determining the wear part and the wear amount of the CTA pressure filter drum; removing an extrusion wear fatigue layer and a corrosion fatigue layer of a wear part of a rotary drum of the CTA pressure filter according to the detection result, and detecting the hardness of the non-wear part; checking whether an opening defect exists at the joint of the rib plate, and processing a groove with the depth of 3mm and the inclination angle of 45 degrees at the opening defect of the joint of the rib plate after the opening defect is checked until the opening defect of the joint of the rib plate is removed;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: < 0.03%, Cr: 21.5 to 23.5%, Si: 0.6 to 1.0%, Mo: 2.5 to 3.5%, Mn: 0.5% to 2.0%, W7.0% to 9.0%, Ni: 7.5 to 9.5%, Cu: 0.4% to 0.7%, nitrogen: 0.08 to 0.2 percent, and the balance of Fe;
D. fixing a CTA pressure filter drum on a machine tool, adopting a warehouse truck robot to match with a fiber laser to perform continuous scanning, setting fiber laser cladding process parameters, performing laser cladding on a surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 25 g-35 g/min, cladding the surface of a wear part of the CTA pressure filter drum, firstly cladding a groove at a joint of a rib plate, then cladding an axial rib plate, and then cladding a radial outer circular surface of a circumferential rib plate;
E. a vent pipe is arranged on one side of the laser molten pool and used for introducing inert gas into the cooled laser molten pool for cooling;
F. measuring the size of the cooled laser deposited part, then grinding and carrying out PT flaw detection again to ensure that the size and the surface quality of the rotary drum of the CTA pressure filter meet the requirements; and detecting the hardness of the laser deposited part to ensure that the hardness of the CTA pressure filter drum after laser deposition meets the requirement.
Further, in the step D, the laser power of the fiber laser is 1600W to 2100W, and the elevation is 300mm to 325 mm.
Further, in the step D, the spot size of the optical fiber laser is 4mm multiplied by 4mm, the scanning speed is 600mm/min to 1000mm/min, and the lap joint quantity is 2 mm.
Further, the inert gas in the step E is argon.
The invention has the technical effects that: compared with the prior art, the rotary drum laser repairing method of the CTA pressure filter adopts a high-energy laser beam (10)4~105W/cm2) Heating the metal surface, rapidly heating and melting the surface of the substrate and the added alloy powder under the action of heat to form a metallurgical bonding surface cladding layer with extremely low dilution rate, repairing a rotary drum of the CTA pressure filter by adopting a laser cladding process, wherein the heat input, a heat affected zone and distortion are small due to rapid heating and rapid cooling of laser, so that the deformation of the rotary drum of the CTA pressure filter can be avoided, the dilution rate of the cladding layer is less than 5%, the cladding layer is in firm metallurgical bonding with the substrate, and a good cladding layer with controllable cladding layer components and dilution rate can be obtained; (2) the opening defect at the joint of the rib plate is firstly processed to form a groove, and laser cladding is sequentially carried out according to the sequence of firstly forming the groove, then axially depositing and then radially depositing during laser cladding, so that the structure at the joint of the rib plate after cladding is close to that before the groove is cut, and the strength at the joint of the rib plate can still meet the use requirement; (3) PT is adopted for flaw detection before and after welding, and defects are judged, so that the qualification rate of product repair is improved; (4) the arrangement of the groove enables the alloy powder to be completely combined with the rotary drum, and the welding difficulty is reduced.
Drawings
The invention is described in further detail below with reference to the drawings of the specification:
FIG. 1 is a schematic view of a drum;
in the figure: the device comprises a rotary drum 1, a filtering chamber 2, a circumferential rib plate 3, an axial rib plate 4, a rib plate joint 5 and a drainage pipeline 6.
Detailed Description
Example 1
A rotary drum laser repairing method for a CTA pressure filter comprises the following steps:
A. cleaning and detecting the size of the CTA pressure filter drum, and determining the wear part and the wear amount of the CTA pressure filter drum; removing a wear fatigue layer and a corrosion fatigue layer of a wear part of a rotary drum of the CTA pressure filter according to the detection result; and detecting the hardness of the unworn part; whether an opening defect exists at the joint of the rib plate is checked, and a groove with the depth of 3mm and the inclination angle of 45 degrees is processed at the opening defect of the joint of the rib plate for checking the opening defect so as to remove the opening defect of the joint of the rib plate;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.02%, Cr: 22.5%, Si: 0.80%, Mo: 3.0%, Mn: 1.0%, W:8.0%, Ni: 8.0%, Cu: 0.5%, nitrogen: 0.10 percent, and the balance of Fe; the stable and reliable powder conveying system is an important guarantee for the repair quality of metal parts, and the fluctuation of powder conveying influences the repair quality; the basic requirements of laser repair on powder feeding are to continuously, stably, uniformly and controllably feed powder into a laser molten pool;
D. fixing a rotary drum of the CTA pressure filter on a machine tool, adopting a warehouse truck robot to match with a fiber laser to carry out continuous scanning, setting the cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 27g/min, cladding 3 layers on the surface of the abrasion part of the rotary drum of the CTA pressure filter, and the thickness of an alloy cladding layer is 0.45-0.65 mm; the laser power of the fiber laser is 1600W, the elevation is 300mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 600mm/min, and the lap joint quantity is 2 mm; when the groove at the joint of the rib plate is deposited, the groove is deposited by laser, then the circumferential rib plate at the groove is deposited by laser, and finally the radial outer circular surface of the circumferential rib plate at the groove is deposited; when the scanning speed is too high, the phenomenon of discontinuous cladding layer occurs, and the bonding strength is not enough; the dilution rate is in a decreasing trend along with the increase of the scanning speed, and the dilution rate is in an increasing trend along with the increase of the powder feeding amount;
E. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
F. measuring the cooled laser deposition part, then grinding and carrying out PT flaw detection again to ensure that the size and the surface quality of the rotary drum of the CTA pressure filter meet the requirements; and detecting the hardness of the laser deposited part to ensure that the hardness of the CTA pressure filter drum after laser deposition meets the requirement.
Example 2
A rotary drum laser repairing method for a CTA pressure filter comprises the following steps:
A. cleaning and detecting the size of the CTA pressure filter drum, and determining the wear part and the wear amount of the CTA pressure filter drum; removing a wear fatigue layer and a corrosion fatigue layer of a wear part of a rotary drum of the CTA pressure filter according to the detection result; and detecting the hardness of the unworn part; whether an opening defect exists at the joint of the rib plate is checked, and a groove with the depth of 3mm and the inclination angle of 45 degrees is processed at the opening defect of the joint of the rib plate for checking the opening defect so as to remove the opening defect of the joint of the rib plate;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.015%, Cr: 23.0%, Si: 1.0%, Mo: 3.5%, Mn: 2.0%, W:9.0%, Ni: 9.5%, Cu: 0.7%, nitrogen: 0.2 percent and the balance of Fe;
D. fixing a rotary drum of a CTA (polyethylene terephthalate) pressure filter on a machine tool, adopting a warehouse-card robot to match with a fiber laser to carry out continuous scanning, setting the cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 31g/min, cladding 3 layers on the surface of the abrasion part of the rotary drum of the CTA pressure filter, and the thickness of an alloy cladding layer is 0.4-0.55 mm; the laser power of the fiber laser is 1800W, the elevation is 315mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 800mm/min, and the lap joint quantity is 2 mm; when the groove at the joint of the rib plate is deposited, the groove is deposited by laser, then the radial outer circular surface of the circumferential rib plate at the groove is deposited by laser, and finally the radial rib plate at the groove is deposited;
E. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
F. measuring the cooled laser deposition part, then grinding and carrying out PT flaw detection again to ensure that the size and the surface quality of the rotary drum of the CTA pressure filter meet the requirements; and detecting the hardness of the laser deposited part to ensure that the hardness of the CTA pressure filter drum after laser deposition meets the requirement.
Example 3
A rotary drum laser repairing method for a CTA pressure filter comprises the following steps:
A. cleaning and detecting the size of the CTA pressure filter drum, and determining the wear part and the wear amount of the CTA pressure filter drum; removing a wear fatigue layer and a corrosion fatigue layer of a wear part of a rotary drum of the CTA pressure filter according to the detection result; and detecting the hardness of the unworn part; whether an opening defect exists at the joint of the rib plate is checked, and a groove with the depth of 3mm and the inclination angle of 45 degrees is processed at the opening defect of the joint of the rib plate for checking the opening defect so as to remove the opening defect of the joint of the rib plate; whether an opening defect exists at the joint of the rib plate is checked, and a groove with the depth of 3mm and the inclination angle of 45 degrees is processed at the opening defect of the joint of the rib plate for checking the opening defect so as to remove the opening defect of the joint of the rib plate;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.01%, Cr: 21.5%, Si: 0.6%%, Mo: 2.5%, Mn: 0.5%, W:7.0%, Ni: 7.5%, Cu: 0.4%, nitrogen: 0.10 percent, and the balance of Fe;
D. fixing a rotary drum of a CTA (polyethylene terephthalate) pressure filter on a machine tool, adopting a warehouse-card robot to match with a fiber laser to carry out continuous scanning, setting the cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 34g/min, cladding 3 layers on the surface of the abrasion part of the rotary drum of the CTA pressure filter, and the thickness of an alloy cladding layer is 0.55-0.7 mm; the laser power of the fiber laser is 2100W, the elevation is 320mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 1000mm/min, and the lap joint quantity is 2 mm; when the groove at the joint of the rib plate is deposited, the groove is deposited by laser, then the radial outer circular surface of the circumferential rib plate at the groove is deposited by laser, and finally the radial rib plate at the groove is deposited;
E. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
F. measuring the cooled laser deposition part, then grinding and carrying out PT flaw detection again to ensure that the size and the surface quality of the rotary drum of the CTA pressure filter meet the requirements; and detecting the hardness of the laser deposited part to ensure that the hardness of the CTA pressure filter drum after laser deposition meets the requirement.
Example 4
A rotary drum laser repairing method for a CTA pressure filter comprises the following steps:
A. cleaning and detecting the size of the CTA pressure filter drum, and determining the wear part and the wear amount of the CTA pressure filter drum; removing a wear fatigue layer and a corrosion fatigue layer of a wear part of a rotary drum of the CTA pressure filter according to the detection result; and detecting the hardness of the unworn part; whether an opening defect exists at the joint of the rib plate is checked, and a groove with the depth of 3mm and the inclination angle of 45 degrees is processed at the opening defect of the joint of the rib plate for checking the opening defect so as to remove the opening defect of the joint of the rib plate;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.02%, Cr: 22.0%, Si: 0.75%, Mo: 3.2%, Mn: 1.6%, W:8.1%, Ni: 7.9%, Cu: 0.65%, nitrogen: 0.16 percent, and the balance of Fe;
D. fixing a rotary drum of the CTA pressure filter on a machine tool, adopting a warehouse truck robot to match with a fiber laser to carry out continuous scanning, setting the cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 26g/min, cladding 3 layers on the surface of the abrasion part of the rotary drum of the CTA pressure filter, and the thickness of an alloy cladding layer is 0.65-0.80 mm; the laser power of the fiber laser is 1700W, the elevation is 315mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 900mm/min, and the lap joint quantity is 2 mm; when the groove at the joint of the rib plate is deposited, the groove is deposited by laser, then the circumferential rib plate at the groove is deposited by laser, and finally the radial rib plate at the groove is deposited;
E. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
F. measuring the cooled laser deposition part, then grinding and carrying out PT flaw detection again to ensure that the size and the surface quality of the rotary drum of the CTA pressure filter meet the requirements; and detecting the hardness of the laser deposited part to ensure that the hardness of the CTA pressure filter drum after laser deposition meets the requirement.
Carrying out hardness detection on the repaired wear part, wherein the measured strength completely meets the requirement; and metallographic detection is carried out on the repaired part of the rotary drum of the CTA pressure filter, the volume depth of the base material is about 0.03mm and the height of the cladding layer is about 0.72mm according to metallographic photographs and rulers, and the dilution rate of the cladding layer is about 4.2 percent by calculation.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.
Claims (4)
1. A CTA pressure filter drum laser repairing method is characterized by comprising the following steps:
A. cleaning and detecting the size of the CTA pressure filter drum, and determining the wear part and the wear amount of the CTA pressure filter drum; removing an extrusion wear fatigue layer and a corrosion fatigue layer of a wear part of a rotary drum of the CTA pressure filter according to the detection result, and detecting the hardness of the non-wear part; checking whether an opening defect exists at the joint of the rib plate, and processing a groove with the depth of 3mm and the inclination angle of 45 degrees at the opening defect of the joint of the rib plate after the opening defect is checked until the opening defect of the joint of the rib plate is removed;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: < 0.03%, Cr: 21.5 to 23.5%, Si: 0.6 to 1.0%, Mo: 2.5 to 3.5%, Mn: 0.5% to 2.0%, W7.0% to 9.0%, Ni: 7.5 to 9.5%, Cu: 0.4% to 0.7%, nitrogen: 0.08 to 0.2 percent, and the balance of Fe;
D. fixing a CTA pressure filter drum on a machine tool, adopting a warehouse truck robot to match with a fiber laser to perform continuous scanning, setting fiber laser cladding process parameters, performing laser cladding on a surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 25 g-35 g/min, cladding the surface of a wear part of the CTA pressure filter drum, firstly cladding a groove at a joint of a rib plate, then cladding an axial rib plate, and then cladding a radial outer circular surface of a circumferential rib plate;
E. a vent pipe is arranged on one side of the laser molten pool and used for introducing inert gas into the cooled laser molten pool for cooling;
F. measuring the size of the cooled laser deposited part, then grinding and carrying out PT flaw detection again to ensure that the size and the surface quality of the rotary drum of the CTA pressure filter meet the requirements; and detecting the hardness of the laser deposited part to ensure that the hardness of the CTA pressure filter drum after laser deposition meets the requirement.
2. The CTA pressure filter drum laser repair method of claim 1, wherein in step D, the laser power of the fiber laser is 1600W to 2100W and the elevation is 300mm to 325 mm.
3. The CTA pressure filter drum laser repair method of claim 2, wherein in step D, the spot size of the fiber laser is 4mm x 4mm, the scanning speed is 600mm/min to 1000mm/min, and the overlap is 2 mm.
4. The CTA pressure filter drum laser repair method of claim 3, wherein the inert gas in step E is argon.
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| CN105543838A (en) * | 2015-12-25 | 2016-05-04 | 燕山大学 | Remanufacturing method for marine crankshaft |
| US20170044673A1 (en) * | 2014-11-03 | 2017-02-16 | China University Of Mining And Technology | CO3W3C Fishbone-Like Hard Phase-Reinforced Fe-Based Wear-Resistant Coating and Preparation Thereof |
| CN109536955A (en) * | 2019-01-23 | 2019-03-29 | 南京工业大学 | Using laser coaxial synchronous powder feeding system method cladding mould repair technique |
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| CN104141129A (en) * | 2014-07-24 | 2014-11-12 | 燕山大学 | Repairing method for threaded rod |
| US20170044673A1 (en) * | 2014-11-03 | 2017-02-16 | China University Of Mining And Technology | CO3W3C Fishbone-Like Hard Phase-Reinforced Fe-Based Wear-Resistant Coating and Preparation Thereof |
| CN105543838A (en) * | 2015-12-25 | 2016-05-04 | 燕山大学 | Remanufacturing method for marine crankshaft |
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