CN117773128A - Remanufacturing method for 300 steel cylinder parts with damaged inner wall - Google Patents
Remanufacturing method for 300 steel cylinder parts with damaged inner wall Download PDFInfo
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- CN117773128A CN117773128A CN202311772016.XA CN202311772016A CN117773128A CN 117773128 A CN117773128 A CN 117773128A CN 202311772016 A CN202311772016 A CN 202311772016A CN 117773128 A CN117773128 A CN 117773128A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 31
- 238000003754 machining Methods 0.000 claims abstract description 19
- 238000009713 electroplating Methods 0.000 claims abstract description 16
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 7
- 238000011049 filling Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 238000007872 degassing Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000004381 surface treatment Methods 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 32
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 15
- 238000007747 plating Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052793 cadmium Inorganic materials 0.000 claims description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000008439 repair process Effects 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 2
- 230000008520 organization Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 238000005253 cladding Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 238000004372 laser cladding Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- VIROINNDOPNTDI-UHFFFAOYSA-N cadmium titanium Chemical compound [Ti].[Cd] VIROINNDOPNTDI-UHFFFAOYSA-N 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000010288 cold spraying Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Powder Metallurgy (AREA)
Abstract
The invention relates to the technical field of remanufacturing, in particular to a remanufacturing method for a 300 steel cylinder part with damaged inner wall, which comprises the following steps: step one, surface treatment of a 300 steel cylinder part with damaged inner wall; step two, removing the coating on the outer surface of the steel cylinder part with the damaged inner wall 300; step three, manufacturing a sheath; step four, filling parts and powder, and preserving heat and degassing; step five, hot isostatic pressing treatment; step six, rough machining is carried out to remove the sheath; step seven, heat treatment; step eight, performing wire cutting test performance on the detection area; step nine, finish machining; step ten, electroplating the outer surface of the cylindrical part with the repairing layer; and step eleven, carrying out dehydrogenation heat treatment. The invention restores the whole size of the part, eliminates the internal defects of the part and improves the organization of the part by carrying out hot isostatic pressing treatment based on the sheath filled with the cylinder type part and the powder. Provides a basis for subsequent integral processing, and avoids the problem of reference positioning in the local machining process after the local repair of the conventional cylinder parts.
Description
Technical Field
The invention relates to the technical field of remanufacturing, in particular to a remanufacturing method for a 300 steel cylinder part with damaged inner wall.
Background
300M steel (40 CrNi2Si2 MoVA) is widely applied to manufacturing cylinder parts in aviation and aerospace hydraulic actuating elements due to excellent mechanical properties, and is subjected to large-load impact deformation, contact fatigue, corrosion, abrasion and other problems in a long-time service process. 300M steel cylinder parts are often disabled and scrapped due to damage to the inner wall.
The remanufacturing makes the performance and quality of the waste parts not lower than those of new products by specialized treatment. For the damage of the outer surface of the conventional part, various remanufacturing repair methods such as thermal spraying, cold spraying, laser cladding and the like exist.
And for the damage of the inner wall of the cylinder part, the conventional repairing means is severely limited by a narrow space. For example, a special inner hole spray head is required for thermal spray repair, a special inner hole cladding head is required for laser cladding repair, and a method for remanufacturing the inner wall of a sleeve part by induction cladding is disclosed in patent (CN 104988495A), but the method requires a special inner hole induction heating coil.
Such as inner hole spraying heads, inner hole cladding heads, inner hole induction heating coils and the like, are required to be put into cylinder parts for repairing, and for part of small-aperture cylinder parts, the device cannot be put into. And for the long barrel parts, the devices such as the inner hole spraying head, the inner hole cladding head, the inner hole induction heating coil and the like also face a plurality of difficulties such as heat dissipation and cooling.
In addition, the conventional repair means of the inner wall of the cylinder part mostly belong to local repair, local machining is needed after the repair is finished, the cylinder part is usually matched with the rod part to form an actuating unit, the requirement on dimensional accuracy is high, the reference positioning in the local machining process is very difficult, and the size after the local machining can not still meet the use requirement.
Disclosure of Invention
In order to solve the technical problems, the invention provides a remanufacturing method for 300 steel cylinder parts with damaged inner walls.
The technical problems to be solved by the invention are realized by adopting the following technical scheme:
a remanufacturing method for a 300 steel cylinder part with damaged inner wall comprises the following steps:
step one, surface treatment of a 300 steel cylinder part with damaged inner wall:
cleaning the surface of the inner wall damaged 300 steel cylinder part by using acetone, removing attached dirt, and airing at room temperature after cleaning, wherein the surface of the inner wall damaged 300 steel cylinder part is required to be free of residual acetone;
step two, removing the plating layer on the outer surface of the steel cylinder part with the damaged inner wall 300:
placing the inner wall damaged 300 steel cylinder part in ammonium nitrate solution with the concentration of 80-100 g/L for not less than 3 minutes until the coating on the outer surface of the inner wall damaged 300 steel cylinder part is completely removed, then washing with clear water to remove the residual ammonium nitrate solution, washing with acetone, and drying with hot air;
step three, manufacturing a sheath:
adopting a 45# steel plate with the thickness of 4 mm-10 mm, preparing a tubular sheath in a welding mode, wherein the axial dimension of the inner cavity of the sheath is more than 110mm larger than the axial dimension of the inner wall damaged 300 steel cylinder part, and the other dimensions of the inner cavity of the sheath are slightly larger than the other dimensions of the inner wall damaged 300 steel cylinder part;
step four, filling parts and powder, preserving heat and degassing:
placing the inner wall damaged 300 steel cylinder part into a sheath, filling powder in a gap between the sheath and the inner wall damaged 300 steel cylinder part, and forming a detection area at the upper part of an inner cavity of the sheath, wherein the detection area is used for detecting the performance of the repaired cylinder part under the condition that the repaired cylinder part cannot be damaged again after the inner wall damaged 300 steel cylinder part is repaired; the top of the sheath is welded with an upper ring, the upper ring is provided with an exhaust pipe, the sheath is insulated at 400-500 ℃, and the gas in the sheath is pumped through the exhaust pipe, so that the vacuum degree is less than 10 -3 Pa；
Step five, hot isostatic pressing treatment:
performing hot isostatic pressing treatment on the sheath filled with the 300 steel cylinder parts with damaged inner wall and powder: heating to 940-980 ℃ at a heating rate of 200-250 ℃/h, simultaneously heating to 140-180 MPa at a heating rate of 40-50 MPa/h, maintaining the temperature and pressure for 4-6 h at the temperature of 940-980 ℃ and the pressure of 140-180 MPa, then cooling to 720-780 ℃ at a cooling rate of 60-80 ℃/h, reducing the pressure to normal atmospheric pressure at a reducing rate of 80-100 MPa/h, maintaining the normal atmospheric pressure at the temperature of 720-780 ℃ and normal atmospheric pressure for 2-3 h, cooling to 500-550 ℃ at a cooling rate of 5-15 ℃/h, cooling to 150-200 ℃ at a cooling rate of 80-120 ℃/h, and taking out the sheath filled with the steel cylinder parts with the inner wall damaged 300 and powder from the hot isostatic pressing furnace;
step six, rough machining is carried out to remove the sheath:
firstly, turning, removing a sheath on the surface to obtain a cylinder part blank with a repairing layer on the surface, wherein the size of the cylinder part blank is more than 1mm in all directions compared with the size of a final part, and the cylinder part with the required size is obtained through finish machining;
step seven, heat treatment:
heating the cylindrical part with the repairing layer to 870 ℃ for heat preservation for 1h, cooling the oil to room temperature, heating to 300 ℃ for heat preservation for 2-4 h, air-cooling to room temperature, heating to 300 ℃ for heat preservation for 2-4 h, and air-cooling to room temperature;
step eight, performing wire cutting test performance on the detection area:
performing linear cutting on the cylindrical part with the repairing layer, cutting off a detection area which is completely composed of powder, preparing a tensile sample, testing tensile property, and if the tensile strength is more than 1960MPa and the yield strength is more than 1620MPa, enabling the cylindrical part with the repairing layer to be qualified in remanufacturing property and entering a step nine;
step nine, finish machining:
boring the inner surface of the cylindrical part with the repairing layer, honing the inner surface, and finish turning the outer surface of the cylindrical part with the repairing layer by taking the inner surface as a reference;
step ten, electroplating the outer surface of the cylinder part with the repairing layer:
adhering an electric insulating tape to the inner surface of the cylindrical part with the repairing layer, then placing the cylindrical part with the repairing layer in an electroplating bath solution for electroplating on the outer surface, flushing the surface of the cylindrical part with the repairing layer by using flowing water after electroplating, removing the residual electroplating bath solution, drying by using hot air, and manually removing the electric insulating tape on the inner surface of the cylindrical part with the repairing layer;
step eleven, dehydrogenation heat treatment:
and heating the electroplated cylindrical part with the repairing layer to 190 ℃, and preserving heat for 12 hours to perform dehydrogenation heat treatment.
Preferably, the components of the powder filled in the fourth step are in weight percent: 0.42 to 0.46 percent of carbon, 0.6 to 0.8 percent of manganese, 1.4 to 1.6 percent of silicon, 0.7 to 0.9 percent of chromium, 1.7 to 1.9 percent of nickel, 0.3 to 0.5 percent of molybdenum, 0.05 to 0.1 percent of vanadium, 0.2 to 0.4 percent of copper, less than 0.025 percent of oxygen, less than 0.025 percent of nitrogen and less than 0.003 percent of hydrogen.
Preferably, the powder filled in the fourth step is prepared by a plasma rotary electrode method.
Preferably, in the step ten, the plating bath solution comprises the following components: 2 g-5 g/L of metallic titanium, 15 g-25 g/L of metallic cadmium, 30 g-40 g/L of ethylenediamine tetraacetic acid, 100 g-130 g/L of nitrilotriacetic acid, 100 g-130 g/L of ammonia chloride and 20 g-30 g/L of ammonia acetate.
Preferably, the cathode current density in the electroplating process is controlled to be 1A-5A/dm 2 The voltage is controlled between 2V and 5V.
The beneficial effects of the invention are as follows:
the invention restores the whole size of the part, eliminates the internal defects of the part and improves the organization of the part by carrying out hot isostatic pressing treatment based on the sheath filled with the cylinder type part and the powder. The method provides a basis for subsequent overall processing, and avoids the problem of reference positioning in the local machining process after the local repair of the conventional cylinder parts; the annealing and softening of the material are finished through the cooling process in the hot isostatic pressing treatment process, including long-time medium-temperature treatment at 500-780 ℃, so that the hardness of the material is reduced, and the subsequent rough machining is conveniently and smoothly carried out; by setting the axial dimension of the inner cavity of the sheath to be more than 110mm larger than the axial dimension of the cylinder part, a detection area 6 which is completely composed of powder is formed at the upper part, so that the detection performance can be realized without damaging the cylinder part; the size of the cylindrical parts is unlimited through the whole remanufacturing process, and the cylindrical parts with small apertures or long length which cannot be repaired by the conventional means can be repaired; the mechanical properties of the part are basically restored through the hot isostatic pressing treatment and the heat treatment.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic cross-sectional view of a jacket enclosing an inner wall damaged 300 steel cylinder type part and powder.
In the figure: 1. the inner wall is damaged 300 steel cylinder parts; 2. a powder; 3. a sheath; 4. a ring is arranged; 5. an exhaust pipe; 6. and a detection area.
Detailed Description
In order that the manner in which the invention is attained, as well as the features and advantages thereof, will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings.
A remanufacturing method for a 300 steel cylinder part with damaged inner wall comprises the following steps:
step one, cleaning the surface of a 300 steel cylinder part with damaged inner wall
And cleaning the surface of the 300 steel cylinder part with acetone, removing dirt attached to the surface such as greasy dirt and the like, and airing at room temperature after cleaning to ensure that no residual acetone exists on the surface of the 300 steel cylinder part with the damaged inner wall.
Step two, removing the plating layer on the outer surface of the 300 steel cylinder part with damaged inner wall
Placing the inner wall damaged 300 steel cylinder part 1 in ammonium nitrate solution with the concentration of 80-100 g/L for at least 3 minutes until the coating on the outer surface of the inner wall damaged 300 steel cylinder part 1 is completely removed, then washing with clear water to remove the residual ammonium nitrate solution, washing with acetone, and drying with hot air.
Specifically, in this example, the concentration of the ammonium nitrate solution was 100g/L and the soaking time was 15 minutes.
Step three, manufacturing a sheath
The 45# steel plate with the thickness of 4-10 mm is adopted to prepare the tubular sheath 3 in a welding mode, the axial size of the inner cavity of the sheath 3 is more than 110mm larger than the axial size of the inner wall damaged 300 steel cylinder part 1, and the other sizes of the inner cavity of the sheath 3 are slightly more than the other sizes of the inner wall damaged 300 steel cylinder part 1. The upper ring 4 of the sheath 3 is not welded.
Specifically, in this embodiment, the thickness of the 45# steel plate is 5mm, and the axial dimension of the inner cavity of the jacket 3 is greater than the axial dimension 110mm of the inner wall damaged 300 steel cylinder part 1.
Step four, filling parts and powder, preserving heat and degassing
The method comprises the steps of placing the inner wall damaged 300 steel cylinder part 1 into the sheath 3, filling powder 2 in a gap between the sheath 3 and the inner wall damaged 300 steel cylinder part 1, and forming a detection area 6 completely composed of the powder 2 at the upper part of the inner cavity of the sheath 3 due to the fact that the axial size of the inner cavity of the sheath 3 is larger than that of the inner wall damaged 300 steel cylinder part 1 by 110mm, wherein the detection area 6 is used for detecting performance under the condition that the cylinder part is not damaged. Then the upper ring 4 of the sheath 3 is welded, and a special exhaust tube 5 is arranged on the upper ring 4. As shown in fig. 1. The thermal insulation and the degassing are carried out on the sheath 3, the thermal insulation temperature is 400-500 ℃, and the gas in the sheath 3 is pumped out through the pumping pipe 5, so that the vacuum degree is less than 10 -3 Pa。
Specifically, in this example, the holding temperature was 450 ℃.
Further, the ingredients of the filled powder 2 are used in weight percent: 0.42 to 0.46 percent of carbon, 0.6 to 0.8 percent of manganese, 1.4 to 1.6 percent of silicon, 0.7 to 0.9 percent of chromium, 1.7 to 1.9 percent of nickel, 0.3 to 0.5 percent of molybdenum, 0.05 to 0.1 percent of vanadium, 0.2 to 0.4 percent of copper, less than 0.025 percent of oxygen, less than 0.025 percent of nitrogen and less than 0.003 percent of hydrogen. Powder 2 was prepared using a plasma rotary electrode method.
Specifically, in this embodiment, the components of the powder 2 are in weight percent: 0.44% carbon, 0.7% manganese, 1.5% silicon, 0.85% chromium, 1.8% nickel, 0.4% molybdenum, 0.08% vanadium, 0.38% copper, 0.018% oxygen, 0.005% nitrogen, and 0.001% hydrogen.
Step five, hot isostatic pressing treatment
The method comprises the specific steps of heating up the sheath filled with the cylindrical parts and the powder to 940-980 ℃ at a heating rate of 200-250 ℃/h, simultaneously heating up the sheath to 140-180 MPa at a heating rate of 40-50 MPa/h, maintaining the temperature and the pressure for 4-6 h at the temperature of 940-980 ℃ and the pressure of 140-180 MPa, then cooling down the sheath to 720-780 ℃ at a cooling rate of 60-80 ℃/h, reducing the pressure to normal atmospheric pressure at a cooling rate of 80-100 MPa/h, maintaining the temperature for 2-3 h at the temperature of 720-780 ℃ and the normal atmospheric pressure, then cooling down the sheath to 500-550 ℃ at a cooling rate of 5-15 ℃/h, cooling down the sheath to 150-200 ℃ at a cooling rate of 80-120 ℃/h, and taking out the sheath 3 filled with the inner wall damaged 300 steel cylindrical parts 1 and the powder 2 from a hot isostatic pressing furnace.
The process forms a compact repairing layer on the surface of the cylinder part by high-temperature high-pressure treatment at the temperature of 940-980 ℃ and the pressure of 140-180 MPa, and finishes the annealing softening of the material by long-time medium-temperature treatment at the temperature of 500-780 ℃ in the cooling process, thereby reducing the hardness of the material and being beneficial to the subsequent rough machining.
Specifically, in this embodiment, the temperature is raised to 950 ℃ at a temperature raising rate of 200 ℃, the pressure is raised to 175MPa at a pressure raising rate of 40MPa/h, the temperature is kept at 950 ℃ and the pressure is kept at 175MPa for 4h, the temperature is lowered to 760 ℃ at a temperature lowering rate of 60 ℃/h, the pressure is lowered to normal atmospheric pressure at a pressure lowering rate of 100MPa/h, the temperature is kept at 760 ℃ for 2h at normal atmospheric pressure, the normal atmospheric pressure is kept all the time, the temperature is lowered to 550 ℃ at a temperature lowering rate of 10 ℃/h, the temperature is lowered to 150 ℃ at a temperature lowering rate of 80 ℃/h, and the capsule 3 with the steel cylinder part 1 and the powder 2 with the damaged inner wall 300 is taken out from the hot isostatic pressing furnace.
The process forms a compact repairing layer on the surface of the cylinder part by high-temperature high-pressure treatment at 950 ℃ and 175MPa, and finishes the annealing softening of the material by long-time medium-temperature treatment at 550-760 ℃ in the cooling process, thereby reducing the hardness of the material and being beneficial to the subsequent rough machining.
Step six, rough machining turning and removing sheath
Turning the sheath of the cylinder part and powder after hot isostatic pressing, removing the sheath material on the surface to obtain a cylinder part blank with a repair layer on the surface, and placing the blank size of the cylinder part blank by more than 1mm in all directions compared with the size of the final part so as to compensate the deformation and the surface oxide layer caused by the subsequent heat treatment, and finally obtaining the part with the required size through finish machining.
Specifically, in this embodiment, the blank size is 2mm in all directions as compared to the final part size.
(7) Heat treatment of cylinder part blank
And (3) carrying out heat treatment on the cylinder part blank with the repairing layer, and recovering the mechanical properties of the part. The heat treatment process comprises the following steps: heating the cylinder part blank to 870 ℃ for heat preservation for 1h, cooling the oil to room temperature, heating to 300 ℃ for heat preservation for 2 h-4 h, air-cooling to room temperature, heating to 300 ℃ for heat preservation for 2 h-4 h, and air-cooling to room temperature.
Specifically, in this example, the oil was cooled to room temperature, then heated to 300 ℃ for 2 hours, air cooled to room temperature, and then heated to 300 ℃ for 2 hours.
(8) Test performance of wire-electrode cutting test area
And (3) performing linear cutting on the cylindrical part with the repairing layer, cutting off a detection area 6 which is completely composed of powder, preparing a tensile sample, and testing tensile properties, wherein the tensile properties are 2021MPa, 2014MPa and 2026MPa, and the yield strengths are 1803MPa, 1795MPa and 1807MPa. If the test performance is required to meet the requirement that the tensile strength is more than 1960MPa and the yield strength is more than 1620MPa, the remanufacturing performance of the cylinder part is qualified, and the subsequent working procedures such as finish machining can be performed.
(9) Finishing work
And boring the inner surface of the cylinder part blank with the repairing layer, honing the inner surface, and finish turning the outer surface of the cylinder part blank with the inner surface as a reference. The parts meet the size requirement, and the repaired cylinder parts are obtained.
(10) Electroplating of the outer surface of cylindrical parts
The electric insulating tape is used for adhering to the inner surface of the cylinder part to play a role of protection, and then the cylinder part is placed in a plating bath solution for plating the outer surface, wherein the plating bath solution comprises 2-5 g/L of metallic titanium, 15-25 g/L of metallic cadmium, 30-40 g/L of ethylenediamine tetraacetic acid, 100-130 g/L of nitrilotriacetic acid, 100-130 g/L of ammonia chloride and 20-30 g/L of ammonia acetate. The cathode current density is controlled between 1A and 5A/dm in the electroplating process 2 The voltage is controlled between 2V and 5V. And (3) flushing the surface of the cylinder part by using running water, removing residual plating bath solution, drying by using hot air, and manually removing the electric insulating adhesive tape on the inner surface of the cylinder part. The outer surface is re-plated with a cadmium-titanium coating. Thereby ensuring that the parts are repaired as new and recovering the comprehensive performance.
Specifically, in the embodiment, the plating bath solution comprises 4g/L of metallic titanium, 20 g/L of metallic cadmium, 30g/L of ethylenediamine tetraacetic acid, 100g/L of nitrilotriacetic acid, 110 g/L of ammonia chloride and 25g/L of ammonia acetate. The cathode current density in the electroplating process is controlled to be 2A/dm 2 The voltage was controlled at 3.5V.
(11) Dehydrogenation treatment
And (3) carrying out dehydrogenation heat treatment on the electroplated cylinder parts, wherein the process is to heat the cylinder parts to 190 ℃ and keep the temperature for 12 hours. And the hydrogen embrittlement of the parts in the subsequent service process is ensured.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A remanufacturing method for a 300 steel cylinder part with damaged inner wall is characterized in that: the method comprises the following steps:
step one, surface treatment of a 300 steel cylinder part with damaged inner wall:
cleaning the surface of the inner wall damaged 300 steel cylinder part by using acetone, removing attached dirt, and airing at room temperature after cleaning, wherein the surface of the inner wall damaged 300 steel cylinder part is required to be free of residual acetone;
step two, removing the plating layer on the outer surface of the steel cylinder part with the damaged inner wall 300:
placing the inner wall damaged 300 steel cylinder part in ammonium nitrate solution with the concentration of 80-100 g/L for not less than 3 minutes until the coating on the outer surface of the inner wall damaged 300 steel cylinder part is completely removed, then washing with clear water to remove the residual ammonium nitrate solution, washing with acetone, and drying with hot air;
step three, manufacturing a sheath:
adopting a 45# steel plate with the thickness of 4 mm-10 mm, preparing a tubular sheath (3) in a welding mode, wherein the axial dimension of the inner cavity of the sheath (3) is more than 110mm larger than the axial dimension of the inner wall damaged 300 steel cylinder part (1), and the other dimensions of the inner cavity of the sheath (3) are slightly larger than the other dimensions of the inner wall damaged 300 steel cylinder part (1);
step four, filling parts and powder, preserving heat and degassing:
putting the steel cylinder part (1) with the damaged inner wall 300 into a sheath (3), filling powder (2) in a gap between the sheath (3) and the steel cylinder part (1) with the damaged inner wall 300, forming a detection area (6) at the upper part of an inner cavity of the sheath (3), welding an upper ring (4) at the top of the sheath (3), arranging an exhaust pipe (5) on the upper ring (4), insulating the sheath (3) at 400-500 ℃, and pumping gas in the sheath (3) through the exhaust pipe (5) to ensure that the vacuum degree is less than 10 -3 Pa；
Step five, hot isostatic pressing treatment:
performing hot isostatic pressing treatment on a sheath (3) filled with the inner wall damaged 300 steel cylinder part (1) and the powder (2): heating to 940-980 ℃ at a heating rate of 200-250 ℃/h, simultaneously heating to 140-180 MPa at a heating rate of 40-50 MPa/h, maintaining the temperature and pressure for 4-6 h at the temperature of 940-980 ℃ and the pressure of 140-180 MPa, then cooling to 720-780 ℃ at a cooling rate of 60-80 ℃/h, reducing the pressure to normal atmospheric pressure at a reducing rate of 80-100 MPa/h, maintaining the normal atmospheric pressure for 2-3 h at the temperature of 720-780 ℃ and normal atmospheric pressure, cooling to 500-550 ℃ at a cooling rate of 5-15 ℃/h, cooling to 150-200 ℃ at a cooling rate of 80-120 ℃/h, and taking out a sheath (3) filled with the steel cylinder part (1) with the inner wall damaged 300 and the powder (2) from a hot isostatic pressing furnace;
step six, rough machining is carried out to remove the sheath (3):
firstly turning, removing a sheath (3) on the surface to obtain a cylinder part blank with a repairing layer on the surface, wherein the size of the cylinder part blank is more than 1mm in all directions compared with the size of a final part, and the cylinder part with the required size is obtained through finish machining;
step seven, heat treatment:
heating the cylindrical part with the repairing layer to 870 ℃ for heat preservation for 1h, cooling the oil to room temperature, heating to 300 ℃ for heat preservation for 2-4 h, air-cooling to room temperature, heating to 300 ℃ for heat preservation for 2-4 h, and air-cooling to room temperature;
step eight, performing linear cutting test performance on the detection area (6):
performing linear cutting on the cylindrical part with the repairing layer, cutting off a detection area (6) which is completely formed by the powder (2), preparing a tensile sample and testing tensile properties, if the tensile strength is more than 1960MPa and the yield strength is more than 1620MPa, enabling the cylindrical part with the repairing layer to be qualified in remanufacturing performance, and entering a step nine;
step nine, finish machining:
boring the inner surface of the cylindrical part with the repairing layer, honing the inner surface, and finish turning the outer surface of the cylindrical part with the repairing layer by taking the inner surface as a reference;
step ten, electroplating the outer surface of the cylinder part with the repairing layer:
adhering an electric insulating tape to the inner surface of the cylindrical part with the repairing layer, then placing the cylindrical part with the repairing layer in an electroplating bath solution for electroplating on the outer surface, flushing the surface of the cylindrical part with the repairing layer by using flowing water after electroplating, removing the residual electroplating bath solution, drying by using hot air, and manually removing the electric insulating tape on the inner surface of the cylindrical part with the repairing layer;
step eleven, dehydrogenation heat treatment:
and heating the electroplated cylindrical part with the repairing layer to 190 ℃, and preserving heat for 12 hours to perform dehydrogenation heat treatment.
2. The remanufacturing method for a damaged inner wall 300 steel cylinder type part according to claim 1, wherein: the components of the powder (2) filled in the step four are as follows in percentage by weight: 0.42 to 0.46 percent of carbon, 0.6 to 0.8 percent of manganese, 1.4 to 1.6 percent of silicon, 0.7 to 0.9 percent of chromium, 1.7 to 1.9 percent of nickel, 0.3 to 0.5 percent of molybdenum, 0.05 to 0.1 percent of vanadium, 0.2 to 0.4 percent of copper, less than 0.025 percent of oxygen, less than 0.025 percent of nitrogen and less than 0.003 percent of hydrogen.
3. The remanufacturing method for a damaged inner wall 300 steel cylinder type part according to claim 1, wherein: and step four, preparing the filled powder (2) by adopting a plasma rotary electrode method.
4. The remanufacturing method for a damaged inner wall 300 steel cylinder type part according to claim 1, wherein: in the step ten, the plating bath solution comprises the following components: 2 g-5 g/L of metallic titanium, 15 g-25 g/L of metallic cadmium, 30 g-40 g/L of ethylenediamine tetraacetic acid, 100 g-130 g/L of nitrilotriacetic acid, 100 g-130 g/L of ammonia chloride and 20 g-30 g/L of ammonia acetate.
5. The remanufacturing method for a damaged inner wall 300 steel cylinder type part according to claim 1, wherein: step ten, controlling the cathode current density to be 1A-5A/dm in the electroplating process 2 The voltage is controlled between 2V and 5V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311772016.XA CN117773128A (en) | 2023-12-21 | 2023-12-21 | Remanufacturing method for 300 steel cylinder parts with damaged inner wall |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311772016.XA CN117773128A (en) | 2023-12-21 | 2023-12-21 | Remanufacturing method for 300 steel cylinder parts with damaged inner wall |
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