CN105586562A - Process for remanufacturing piston rod of concrete pump truck - Google Patents
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Abstract
The invention discloses a process for remanufacturing a piston rod of a concrete pump truck, and belongs to the technical field of metal surface treatment materials. The process comprises the following steps that a spraying material is selected; and the spraying surface of a substrate is subjected to sand blasting to clean the surface of a sample, rust and oil dirt are removed, and the substrate surface with the surface roughness Ra of 0.3 to 0.5 is obtained. A high-speed electric arc spraying system based on robot automation is adopted for spraying. A plasma arc welding machine is used, and a plasma remelting process is carried out on a spraying coating through a direct face-bonding method in a shielding gas environment. In the remelting process, the spraying coating is recrystallized, the laminated structure of the spraying coating can be improved, and holes and oxide inclusion of the original spraying coating can be removed, so that the remelted spraying coating becomes even and compact. Due to high energy input, the coating and the substrate achieve metallurgical bonding, and finally a remelted layer can achieve the excellent mechanical property.
Description
Technical field
The present invention relates to the process that a kind of concrete mixer piston rod is manufactured again, adopt high speed arc spraying sprayThe metal surface treating method of painting-plasma remelting, belongs to Treatment of Metal Surface material technology field.
Background technology
Concrete mixer piston rod, in practical work process, has a small amount of silt particle to splash in hydraulic cylinder,Back and forth in the process of working in reciprocating mode, bear larger alternate load and vibratory impulse effect at hydraulic cylinder,And produce friction with external grit and metal surface, cause coming off of surfacing, modal officePortion's damage type scratches exactly, peels off and the phenomenon such as wearing and tearing. Find according to investigation statistics, at axial workpieceInefficacy in nearly have 80% inefficacy causing for wearing and tearing, and the inefficacy that wearing and tearing cause have the overwhelming majority be byAbrasive wear causes.
In addition, concrete mixer has some will export to overseas or use in coastal area, makesWith in process, sometimes to experience harsh corrosive environment, as Atmosphere and Ocean environment, industry pollution etc.,The corrosion phenomenons such as piston rod and surrounding medium generation spot corrosion.
At present most domestic engineering machinery company mainly adopts the use week of changing part and maintain concrete mixerPhase, though the method can be met customer need, be unfavorable for enterprise's long term growth and nation-building resources conservationThe strategy of sustainable development of type, friendly environment society, and these key components and parts costs are very high, change partCycle is long, and this can cause great inconvenience to enterprise's production and operation. Therefore, for concrete mixerThe piston rod of inefficacy, adopt suitable manufacturing process technology again to manufacture again reparation to it, research againThe key issues such as the performance of manufacture back piston bar, can improve the efficiency of manufacturing again, extend its service life,Reduce the waste of resource, effectively promote the development of China's engineering machinery field spare parts remanufacture industry.
The technology that manufacturing engineering field utilizes again mainly contains flame-spraying, Brush Plating and arc spraying technology.Arc spraying technology, good to the controllability of coating, production efficiency is high, and technique is simple, and cost is low, energy consumptionLow, coating quality is stable, and therefore, electric-arc thermal spray coating technology is widely used in prepares wear-resistant coating, anticorrosionThe aspects such as coating and plant equipment remediation intensification.
High speed arc spraying plasma spray technology be utilize burning and two send to continuously by the electricity between spraying wireArc makes metal wire material fusing as thermal source, molten metal is atomized into particulate with high velocity air, and makesAtomization metal particle accelerates, and atomization particle jet high speed deposition forms the technology of coating to surface of the work. ByThe institutional framework that is stacked in layers in High Speed Electric Arc Spraying layer, and inner certain hole and the oxide of existingBe mingled with, with matrix be mechanical bond, affected to a certain extent hardness and the bond strength of sprayed coating.In the time being on active service under the harsh operating mode of sprayed coating in HI high impact or alternate load, easily cause sprayed coating to peel off mistakeEffect. In order to improve institutional framework and the military service performance of High Speed Electric Arc Spraying layer, can carry out weight to sprayed coatingMolten processing.
At present had certain progress for the research work of Technology For Remelting both at home and abroad, this is wherein mainComprise laser remolten, electron beam remelting, plasma remelting, inducting remolten and argon arc remelting technology etc.
Laser remolten energy density is high, stable output power, but coating in reflow process due to laser weightMolten Fast Heating is the feature of cooled and solidified rapidly, and therefore residual stress in coating is larger, and coating is easily openedSplit and come off, laser remolten cost is higher simultaneously, and efficiency is low, and the huge complexity of equipment, is unfavorable for operating mode barRepairing operation under part.
Electron beam remelting technology necessarily requires under vacuum chamber condition, and electron beam hot spot than laser beam spot alsoTiny, be applicable to sample less or require the accurate post-processing technology in remelting region. Electron beam weightAlso there is the operation and maintenance complexity of equipment in melting apparatus, need to carry out indoor.
Inducting remolten utilization be Kelvin effect, have little to matrix heat affected area, workpiece deformation is little, techniqueSimply, the advantage such as workpiece clean environment, but it is limited by induction coil shape and size, is only suitable for size littleRound piece.
Tungsten argon arc Technology For Remelting cost is low, and strengthening effect is good, simple to operate, can grasp at the construction field (site)Do, at home and abroad success is for as automobile engine cylinder-body, cylinder sleeve, camshaft and many pumpsBody and valve body etc.; Arc spray melting superficial layer rough surface, spread heat, causes sprayed coating fusion penetration little, difficultyTo form metallurgical binding. Plasma remelting is that one utilizes beam-plasma as high temperature heat source, by regulatingCorresponding technological parameter, controls the input of heat, ensures to obtain the remelted layer that fusion penetration is shallow, dilution rate is low,Thereby obtain shock-resistant, wear-resisting and corrosion resistant superficial layer quality. Beam-plasma Technology For Remelting and other are heavyMolten technology is compared, and beam-plasma can be depressed and carry out at normal atmosphere, does not need vacuum environment, technical processSimply, equipment cost is low. Its advantage is to obtain high surface heating, and cooling velocity is fast, concentration of energy,Penetration power is strong, and technology stability is good, and directive property is strong, and extraneous factor is disturbed little, and coating fusing is abundant,Gas and slag in molten bath are easily discharged, thereby obtain high-quality remelted layer.
Reflow process, by the recrystallization to sprayed coating, can be improved the layer structure of sprayed coating, eliminates formerThere are hole and the oxide inclusions of sprayed coating, make the coating after remelting become even, fine and close, and due toHigh-energy input makes coating and matrix present metallurgical binding, and final remelted layer can obtain excellent mechanicsPerformance.
Compared with the piston rod of existing chromium plating, piston rod chromium plating corrosion resistance is limited, long-term use procedureMiddle meeting produces corrosion phenomenon. The general area of damage causing due to corrosion is all comparatively large, and divides in the form of sheetsCloth. And the impact of piston rod chrome-plating process environmental pollution greatly, be unfavorable for the friendly type of built environment society.In addition by manufacturing and can greatly save manufacturing cost again, then manufacturing cost is less than 30% of new product, applicationProspect is very wide.
Summary of the invention
The process that the object of the present invention is to provide a kind of piston rod to manufacture again, makes through this technique againThe piston rod heterogeneous microstructure of making becomes even, fine and close, eliminates the hole of original sprayed coating, moltenThe defects such as grain and oxide inclusions and microfissure, make coating and base material change metallurgy into by mechanical bondIn conjunction with, thereby improve its anti-wear performance.
The present invention is achieved through the following technical solutions:
Determine the metal surface of replacing this part employing High Speed Electric Arc Spraying-plasma remelting after claimProcessing method, the method comprises the following steps:
(1) select matrix material and sprayed on material;
(2) preparation of sprayed coating: the sprayed surface of matrix is carried out to blasting treatment, to clean sampleSurface, remove iron rust and greasy dirt and obtain the matrix surface of surface roughness Ra=0.3～0.5. AdoptHigh Speed Electric Arc Spraying system based on robot automation sprays;
(3) preparation of remelted layer: use plasma arc welder, in protection compression ring border, adopt straightConnect positive connection sprayed coating is carried out to plasma remelting technique.
Matrix in described step (1) is piston rod.
In described step (1), sprayed on material is FeNiCrAl series spraying wire. Silk material chemical compositionFor C:0.6～0.8%, Ni:9～15%, Gr:12%, Al:11～13%, B:2～3%, Si:2～2.5%,Re:0.6～0.7%, wherein mixes the La that Re is 25～28% by quality percentage composition; 48～52% Ce;14～17% Nb and 4～6% Pu composition, surplus is Fe.
Technological parameter in described step (2) is: spray voltage 34～40V, and spraying current 160～200A,Spray distance 160～200mm, 90 ° of spray angles, atomization air pressure 0.5～0.7MPa.
1) planning in piston rod spraying path: first, under the definite spraying condition of above-mentioned steps (2)Determine approximately 8～11mm of particle beam spot diameter, according to the size of workpiece, on the length direction of piston rodDetermine a key point every 10～15mm, between key point spacing divide according to being spraying particle bundleThere are certain mapping relations in the line spot diameter that arrives matrix, if interval is greater than between key point15mm, the coating forming between the per pass particle beams in spraying process overlap joint is inhomogeneous, finally forms coatingThickness flatness is poor, also affects the thickness evenness of follow-up remelted layer.
Determine after key point, spray the planning in path, process is for to be adjusted to teaching work by robotUnder operation mode, adjustment spray gun is moved to piston rod surface and starts to spray a little, and note is deposited first position, establishesDetermining spray gun translational speed is 80～100mm/s, and workpiece rotary speed is 12～15rad/s, 15 ° of piston rod rotations,Spray gun moves to the second key point, and all programs are deposited and write to note successively, in the time having write last point, and willPiston rod rotates to initial position, and piston rod surface to be painted is raised and left to spray gun, and coding is deposited inMOTOMAN robot control system.
2) spraying coating process process: spray gun and matrix surface keep perpendicular attitude motionless, piston rod is in frockThe lower clockwise rotation of clamping, piston rod rotates a circle, and together, piston rod is rotated counterclockwise again in sprayingOne week, spraying second, piston rod constantly clockwise and be rotated counterclockwise, completes whole surface successivelyOne time spraying.
Spray efficiency is 10～15 μ m/ time, in order to obtain good remelting effect, preparation electric arc spraying layerThickness must be strict controlled in suitable thickness, and the thicker reflow process that causes of preparation coating must adoptThe input of large heat could be carried out complete penetration to coating, reaches and between coatings and substrate, reaches metallurgical bindingEffect, but larger heat input can cause the dilution rate between coating and matrix combination interface close region to becomeGreatly, cause alloying element in remelted layer more be spread in body portion, remelted layer is due to alloying elementThe more meeting of loss of composition causes its hardness and wear resistance decrease, in addition, and heat in sprayed coating reflow processInput quantity is larger, can cause coatings and substrate overheated serious, and remelted layer internal residual stress is larger, matrixThe thermal deformation occurring is serious, has a strong impact on the dimensional accuracy of manufacturing again piston rod after remelting.
Meanwhile, the thickness of preparation electric arc spraying layer can not be too little, because need coating in reflow processMelt and be attended by blow force of arc effect, remelted layer thickness is slightly thinner than the thickness of original sprayed coating, is difficult to protectCard can arrive the standard use size of piston rod again through later stage grinding, ensure that piston rod hasMilitary service performance preferably, must ensure suitable coating layer thickness.
Therefore, the present invention relates to prepare electric arc spraying layer thickness approximately 400～500 μ m.
Welding gun in described step (3) and the distance of workpiece are 3～5mm, and protective gas is argon gas, streamAmount is 6～10L/min.
In described step (3), remelting processing parameter is: arc current 60～80A, translational speed1.5～2.5mm/s, ion-gas flow 3～5L/min, overlapping rate 30%～50%. According to optimization of orthogonal test,Can obtain optimal remelting processing parameter is: arc current 80A, translational speed 2mm/s, ionThroughput is 3L/min, and overlapping rate is 30%.
Remelting processing process: the preparation of piston rod plasma remelting layer: use arc current 80A, movementSpeed 2mm/s and ion-gas flow 8L/min carry out plasma remelting to the High Speed Electric Arc Spraying layer of piston rodProcess, obtain piston rod plasma remelting layer.
Beneficial effect of the present invention is:
(1) coating structure densification after remelting, has reduced porosity and crackle, has caused grain refinement,Improve the mechanical property of remelted layer. Obtain remelted layer element by line surface sweeping EDS energy spectrum analysis distributes simultaneouslyEvenly, remelted layer diffusion of alloy elements is in the middle of matrix, and remelted layer and matrix are metallurgical binding, have increasedThe bond strength of remelted layer and matrix.
(2) the remelted layer dense structure of preparing, porosity is lower than 10%, average bonding strength up to52MPa, in coating, disperse is distributed with Fe-Al intermetallic compound, the Cr of high rigidity0.19Fe0.1Ni0.11GuSolution and (Fe, Cr)3C carbide, makes coating have higher microhardness (about 620HV0.1)。
(3) remelted layer wear surface is more smooth smooth, produces abrasive dust less, is coated with after remelting is describedThe large panel height of anti-abrasive wear ability of layer. Remelted layer has formed the institutional framework of " hard phase+soft matrix ", makesMust in friction process, there is excellent anti-wear performance.
Brief description of the drawings
Fig. 1 is piston rod spraying path planning schematic diagram
Fig. 2 a is pictorial diagram after piston rod spraying is manufactured again
Fig. 2 b is pictorial diagram after the remelting of piston rod sprayed coating
Fig. 3 is the SEM shape appearance figure of remelted layer.
Fig. 4 is that the scanning of remelted layer bottom combination interface tissue surface can spectrogram
Fig. 5 is the hardness distribution of sprayed coating and remelted layer
Fig. 6 is the coefficient of friction change curve of different coating
Detailed description of the invention
This example be to piston rod as described above technique manufacture again, ion-gas all adopts argon gas.
Embodiment mono-:
Its concrete implementation step is:
(1) piston rod automatic spraying programming: first adopt off-line programing to spray on controllerWriting of painting program. According to the size of workpiece, on piston rod length direction, equidistant 10mm interval is dividedGo out key point, robot is adjusted under teaching mode of operation, adjustment spray gun is moved to piston rod surface and is openedBegin to spray point, note is deposited first position, and setting spray gun translational speed is 80mm/s, and workpiece rotary speed is12rad/s, 15 ° of piston rod rotations, spray gun moves to the second key point, and all programs are deposited and write to note successively,In the time having write last point, piston rod is rotated to initial position, spray gun is raised and to leave piston rod to be paintedSurface, deposits coding in MOTOMAN robot control system.
(2) before spraying, first piston rod surface is carried out to surface degreasing, rust cleaning cleaning, carry out subsequently sandblast thickChange and process, 46 object corundum sand grains are selected in sandblast, and sandblast distance is 150mm, and sandblast angle is 90 °,After sandblast, Substrate Surface Roughness is 0.3.
(3) piston rod spraying path planning: equal through the lateral length direction of blasting treatment back piston barSeparate the node that is spaced apart 10mm, successively according to these node locations, mark off in a circumferential direction decileAnnulus, the feature in this path is in spraying process, spray gun and matrix surface keep perpendicular attitude motionless, liveStopper rod is clockwise rotation under the clamping of frock, and piston rod rotates a circle, and together, piston rod again in sprayingBe rotated counterclockwise one week, spraying second, piston rod constantly clockwise and be rotated counterclockwise, completes successivelyA spraying on whole surface, the sprayed on material of employing is FeNiCrAl series spraying wire. Silk material chemical groupBecome C:0.6%, Ni:10%, Cr:12%, Al:11%, B:2%, Si:2%, RE:0.6%,Wherein mix the La that Re is 27% by quality percentage composition; 50% Ce; 17% Nb and 6% PuComposition, surplus is Fe. Technological parameter is spraying current 200A, spray voltage 34V, spray distance 160mmIt is carried out to High Speed Electric Arc Spraying, spray altogether 35 times, coating layer thickness approximately 400 μ m.
(4), in protection compression ring border, adopt directly positive connection to carry out plasma remelting technique to sprayed coating;The distance of welding gun and workpiece is 3mm, and protective gas is argon gas, and flow is 10L/min, spraying back piston barThe preparation of plasma remelting layer: use arc current 80A, translational speed 2mm/s and ion-gas flow 3L/minHigh Speed Electric Arc Spraying layer to piston rod carries out plasma remelting processing, obtains piston rod plasma remelting layer,Remelted layer thickness approximately 350 μ m.
(5) the remelted layer dense structure of preparing, average bonding strength is up to 52MPa, and in coating, disperse dividesBe furnished with Fe-Al intermetallic compound, the Cr of high rigidity0.19Fe0.1Ni0.11Solid solution and (Fe, Cr)3C carbide,Make coating there is higher microhardness (about 620HV0.1)。
Embodiment bis-:
Its concrete implementation step is:
(1) piston rod automatic spraying programming: first adopt off-line programing to spray on controllerWriting of painting program. According to the size of workpiece, on piston rod length direction, equidistant 10mm interval is dividedGo out key point, robot is adjusted under teaching mode of operation, adjustment spray gun is moved to piston rod surface and is openedBegin to spray point, note is deposited first position, and setting spray gun translational speed is 90mm/s, and workpiece rotary speed is13rad/s, 15 ° of piston rod rotations, spray gun moves to the second key point, and all programs are deposited and write to note successively, whenWhile having write last point, piston rod is rotated to initial position, piston rod table to be painted is raised and left to spray gunFace, deposits coding in MOTOMAN robot control system.
(2) before spraying, first piston rod surface is carried out to surface degreasing, rust cleaning cleaning, carry out subsequently sandblast thickChange and process, 46 object corundum sand grains are selected in sandblast, and sandblast distance is 150mm, and sandblast angle is 90 °,After sandblast, Substrate Surface Roughness is 0.37.
(3) piston rod spraying path planning: equal through the lateral length direction of blasting treatment back piston barSeparate the node that is spaced apart 10mm, successively according to these node locations, mark off in a circumferential direction decileAnnulus, the feature in this path is in spraying process, spray gun and matrix surface keep perpendicular attitude motionless, liveStopper rod is clockwise rotation under the clamping of frock, and piston rod rotates a circle, and together, piston rod again in sprayingBe rotated counterclockwise one week, spraying second, piston rod constantly clockwise and be rotated counterclockwise, completes successivelyA spraying on whole surface, the sprayed on material of employing is FeNiCrAl series spraying wire. Silk material chemical groupBecome C:0.8%, Ni:10%, Cr:12%, Al:12%, B:2.3%, Si:2.1%, RE:0.6%,Wherein mix the La that Re is 28% by quality percentage composition; 52% Ce; 14% Nb and 6% PuComposition, surplus is Fe. Technological parameter is spraying current 160A, spray voltage 36V, spray distance 170mmIt is carried out to High Speed Electric Arc Spraying, spray altogether 40 times, coating layer thickness approximately 420 μ m.
(4), in protection compression ring border, adopt directly positive connection to carry out plasma remelting technique to sprayed coating;The distance of welding gun and workpiece is 3mm, and protective gas is argon gas, and flow is 10L/min, spraying back piston barThe preparation of plasma remelting layer: use arc current 60A, translational speed 1.5mm/s and ion-gas flow3L/min carries out plasma remelting processing to the High Speed Electric Arc Spraying layer of piston rod, obtains piston rod plasma weightCrucible zone, remelted layer thickness approximately 360 μ m.
(5) the remelted layer dense structure of preparing, average bonding strength is up to 55MPa, and in coating, disperse dividesBe furnished with Fe-Al intermetallic compound, the Cr of high rigidity0.19Fe0.1Ni0.11Solid solution and (Fe, Cr)3C carbide,Make coating there is higher microhardness (about 620HV0.1)。
Embodiment tri-:
Its concrete implementation step is:
(1) piston rod automatic spraying programming: first adopt off-line programing to spray on controllerWriting of painting program. According to the size of workpiece, on piston rod length direction, equidistant 10mm interval marks offKey point, is adjusted to robot under teaching mode of operation, and adjustment spray gun is moved to piston rod surface and starts sprayTu Dian, note is deposited first position, and setting spray gun translational speed is 90mm/s, and workpiece rotary speed is 14rad/s,15 ° of piston rod rotations, spray gun moves to the second key point, and all programs are deposited and write to note successively, when having writeRear when some, piston rod is rotated to initial position, piston rod surface to be painted is raised and left to spray gun, will writeProgram deposits MOTOMAN robot control system in.
(2) before spraying, first piston rod surface is carried out to surface degreasing, rust cleaning cleaning, carry out subsequently sandblast thickChange and process, 46 object corundum sand grains are selected in sandblast, and sandblast distance is 150mm, and sandblast angle is 90 °,After sandblast, Substrate Surface Roughness is 0.45.
(3) piston rod spraying path planning: equal through the lateral length direction of blasting treatment back piston barSeparate the node that is spaced apart 10mm, successively according to these node locations, mark off in a circumferential direction decileAnnulus, the feature in this path is in spraying process, spray gun and matrix surface keep perpendicular attitude motionless, liveStopper rod is clockwise rotation under the clamping of frock, and piston rod rotates a circle, and together, piston rod again in sprayingBe rotated counterclockwise one week, spraying second, piston rod constantly clockwise and be rotated counterclockwise, completes successivelyA spraying on whole surface, the sprayed on material of employing is FeNiCrAl series spraying wire. Silk material chemical groupBecome C:0.8%, Ni:12%, Gr:12%, Al:12%, B:2.7%, Si:2.5%, RE:0.7%,Wherein mix the La that Re is 28% by quality percentage composition; 49% Ce; 17% Nb and 6% PuComposition, surplus is Fe. Technological parameter is spraying current 180A, spray voltage 38V, spray distance 190mmIt is carried out to High Speed Electric Arc Spraying, spray altogether 45 times, coating layer thickness approximately 450 μ m.
(4), in protection compression ring border, adopt directly positive connection to carry out plasma remelting technique to sprayed coating;The distance of welding gun and workpiece is 5mm, and protective gas is argon gas, and flow is 10L/min, spraying back piston barThe preparation of plasma remelting layer: use arc current 70A, translational speed 2.5mm/s and ion-gas flow4L/min carries out plasma remelting processing to the High Speed Electric Arc Spraying layer of piston rod, obtains piston rod plasma weightCrucible zone, remelted layer thickness approximately 380 μ m.
(5) the remelted layer dense structure of preparing, average bonding strength is up to 55MPa, and in coating, disperse dividesBe furnished with Fe-Al intermetallic compound, the Cr of high rigidity0.19Fe0.1Ni0.11Solid solution and (Fe, Cr)3C carbide,Make coating there is higher microhardness (about 620HV0.1)。
Embodiment tetra-:
Its concrete implementation step is:
(1) piston rod automatic spraying programming: first adopt off-line programing on controllerCarry out writing of spray procedure. According to the size of workpiece, equidistant 10mm on piston rod length directionInterval marks off key point, and robot is adjusted under teaching mode of operation, adjusts spray gun and is moved toPiston rod surface starts to spray a little, and note is deposited first position, and setting spray gun translational speed is 100mm/s,Workpiece rotary speed is 15rad/s, 15 ° of piston rod rotations, and spray gun moves to the second key point, successively noteDeposit and write all programs, in the time having write last point, piston rod is rotated to initial position, sprayPiston rod surface to be painted is raised and left to rifle, deposits coding the control of in MOTOMAN robotSystem.
(2) before spraying, first piston rod surface is carried out to surface degreasing, rust cleaning cleaning, carry out subsequently sandblast thickChange and process, 46 object corundum sand grains are selected in sandblast, and sandblast distance is 150mm, and sandblast angle is 90 °,After sandblast, Substrate Surface Roughness is 0.5.
(3) piston rod spraying path planning: equal through the lateral length direction of blasting treatment back piston barSeparate the node that is spaced apart 10mm, successively according to these node locations, mark off in a circumferential direction decileAnnulus, the feature in this path is in spraying process, spray gun and matrix surface keep perpendicular attitude motionless, liveStopper rod is clockwise rotation under the clamping of frock, and piston rod rotates a circle, and together, piston rod again in sprayingBe rotated counterclockwise one week, spraying second, piston rod constantly clockwise and be rotated counterclockwise, completes successivelyA spraying on whole surface, the sprayed on material of employing is FeNiCrAl series spraying wire. Silk material chemical groupBecome C:0.8%, Ni:14%, Cr:12%, Al:13%, B:3%, Si:2.5%, RE:0.7%,The Nb of the Ce:15% of the La:52% that wherein to mix Re be 27% by quality percentage composition and 6% PuComposition, surplus is Fe. The technological parameter adopting is spraying current 200A, spray voltage 40V, spraying distanceFrom 200mm, it is carried out to High Speed Electric Arc Spraying, spray altogether 50 times, coating layer thickness approximately 500 μ m.
(4), in protection compression ring border, adopt directly positive connection to carry out plasma remelting technique to sprayed coating;The distance of welding gun and workpiece is 3mm, and protective gas is argon gas, and flow is 6L/min, spraying back piston bar etc.The preparation of ion remelted layer: use arc current 80A, translational speed 2.5mm/s and ion-gas flow 5L/minHigh Speed Electric Arc Spraying layer to piston rod carries out plasma remelting processing, obtains piston rod plasma remelting layer,Remelted layer thickness approximately 410 μ m.
(5) the remelted layer dense structure of preparing, average bonding strength is up to 50MPa, and in coating, disperse dividesBe furnished with Fe-Al intermetallic compound, the Cr of high rigidity0.19Fe0.1Ni0.11Solid solution and (Fe, Cr)3C carbide,Make coating there is higher microhardness (about 620HV0.1)。
Claims (3)
1. the technique that concrete mixer piston rod is manufactured again, is characterized in that comprising the following steps:
(1) select sprayed on material; Matrix is piston rod, and sprayed on material is FeNiCrAl series spraying wire;
(2) preparation of sprayed coating: the sprayed surface of matrix is carried out to blasting treatment, to clean the table of sampleFace, removes iron rust and greasy dirt and obtains the matrix surface that roughness is 0.3～0.5; Adopt based on robot certainlyThe High Speed Electric Arc Spraying system of movingization sprays, spray voltage 34～40V, spraying current 160～200A, sprayBe coated with distance 160～200mm, 90 ° of spray angles, atomization air pressure 0.5～0.7MPa; Sprayed coating thickness is400～500μm；
(3) preparation of remelted layer: use plasma arc welder, in protection compression ring border, directly just adoptingConnection is carried out plasma remelting technique to sprayed coating; The distance of welding gun and workpiece is 3-5mm, and protective gas isArgon gas, flow is 6-10L/min, concrete remelting processing parameter is: arc current 60-80A, translational speed1.5-2.5mm/s, ion-gas flow 3-5L/min, ion-gas is argon gas, overlapping rate 30%-50%.
2. technique according to claim 1, is characterized in that, step (2) have for:
1) planning in piston rod spraying path: first determine approximately 8～11mm of particle beam spot diameter, at pistonOn the length direction of bar, determine a key point every 10～15mm, determine after key point, sprayThe planning in path, process, for robot is adjusted under teaching mode of operation, is adjusted spray gun and is moved to piston rodSurface starts to spray a little, and note is deposited first position, and setting spray gun translational speed is 80～100mm/s, and workpiece revolvesRotary speed is 12～15rad/s, 15 ° of piston rod rotations, and spray gun moves to the second key point, and note is deposited and is write successivelyAll programs, in the time having write last point, rotate piston rod to initial position, and work is raised and left to spray gunStopper rod surface to be painted, deposits coding in MOTOMAN robot control system;
2) spraying coating process process: spray gun and matrix surface keep perpendicular attitude motionless, and piston rod is in the clamping of frockLower clockwise rotation, piston rod rotates a circle, and together, piston rod rotates a circle counterclockwise again in spraying, sprayBe coated with second, piston rod constantly clockwise and be rotated counterclockwise, completes a spraying on whole surface successively.
3. technique according to claim 1, is characterized in that, in step (2), spray efficiency is 10～15 μ m/Time.
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| CN109296588A (en) * | 2018-12-10 | 2019-02-01 | 徐工集团工程机械有限公司 | A kind of piston rod and hydraulic cylinder |
| CN111004992A (en) * | 2019-12-13 | 2020-04-14 | 西安交通大学 | Process for in-situ synthesis of Fe-Al coating through laser remelting |
| CN111826571A (en) * | 2020-07-23 | 2020-10-27 | 矿冶科技集团有限公司 | Novel titanium carbide-iron chromium aluminum thermal spraying powder and preparation method thereof |
| CN111962006A (en) * | 2020-08-14 | 2020-11-20 | 中国人民解放军陆军装甲兵学院 | Preparation and laser post-treatment strengthening process of high-energy micro-arc deposition layer on surface of copper alloy |
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| CN103173711A (en) * | 2013-03-04 | 2013-06-26 | 中国人民解放军装甲兵工程学院 | Arc sprayed cored wire suitable for re-melting |
| CN103614685A (en) * | 2013-11-17 | 2014-03-05 | 中国人民解放军装甲兵工程学院 | Automatic double-wire electric arc spraying engine body remanufacturing method |
| CN104191152A (en) * | 2014-08-06 | 2014-12-10 | 陕西天元智能再制造有限公司 | Method for repairing and remanufacturing outer surface of piston rod of hydraulic cylinder or outer surface of intermediate cylinder |
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| CN103173711A (en) * | 2013-03-04 | 2013-06-26 | 中国人民解放军装甲兵工程学院 | Arc sprayed cored wire suitable for re-melting |
| CN103614685A (en) * | 2013-11-17 | 2014-03-05 | 中国人民解放军装甲兵工程学院 | Automatic double-wire electric arc spraying engine body remanufacturing method |
| CN104191152A (en) * | 2014-08-06 | 2014-12-10 | 陕西天元智能再制造有限公司 | Method for repairing and remanufacturing outer surface of piston rod of hydraulic cylinder or outer surface of intermediate cylinder |
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| CN106244968A (en) * | 2016-08-30 | 2016-12-21 | 广东通宇通讯股份有限公司 | A kind of antenna phasing unit aluminium section bar housing surface arc spray process and aluminium section bar cavity |
| CN109296588A (en) * | 2018-12-10 | 2019-02-01 | 徐工集团工程机械有限公司 | A kind of piston rod and hydraulic cylinder |
| CN111004992A (en) * | 2019-12-13 | 2020-04-14 | 西安交通大学 | Process for in-situ synthesis of Fe-Al coating through laser remelting |
| CN111826571A (en) * | 2020-07-23 | 2020-10-27 | 矿冶科技集团有限公司 | Novel titanium carbide-iron chromium aluminum thermal spraying powder and preparation method thereof |
| CN111826571B (en) * | 2020-07-23 | 2021-07-09 | 矿冶科技集团有限公司 | Titanium carbide-iron chromium aluminum thermal spraying powder and preparation method thereof |
| CN111962006A (en) * | 2020-08-14 | 2020-11-20 | 中国人民解放军陆军装甲兵学院 | Preparation and laser post-treatment strengthening process of high-energy micro-arc deposition layer on surface of copper alloy |
| CN111962006B (en) * | 2020-08-14 | 2023-02-28 | 中国人民解放军陆军装甲兵学院 | Preparation and laser post-treatment strengthening process of high-energy micro-arc deposition layer on surface of copper alloy |
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Application publication date: 20160518 |