CN109112467B - Soft nitriding treatment process for fixing ring - Google Patents
Soft nitriding treatment process for fixing ring Download PDFInfo
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- CN109112467B CN109112467B CN201811096829.0A CN201811096829A CN109112467B CN 109112467 B CN109112467 B CN 109112467B CN 201811096829 A CN201811096829 A CN 201811096829A CN 109112467 B CN109112467 B CN 109112467B
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- 238000005121 nitriding Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000005238 degreasing Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 30
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 16
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 238000000354 decomposition reaction Methods 0.000 claims description 9
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 8
- 229960004889 salicylic acid Drugs 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 17
- 239000002932 luster Substances 0.000 description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- 229910021529 ammonia Inorganic materials 0.000 description 14
- 239000001569 carbon dioxide Substances 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000005255 carburizing Methods 0.000 description 4
- 238000005979 thermal decomposition reaction Methods 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- -1 steam Chemical compound 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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Classifications
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a tufftride treatment process of a fixed ring and a tool thereof, and relates to the field of tufftride treatment. The process comprises degreasing cleaning, furnace charging, exhausting, heating and ventilating, cooling, steam treatment and discharging, wherein steam is continuously introduced into a heating furnace, so that the surface of the fixing ring subjected to the soft nitriding treatment is uniform in color and generates a layer of compact oxide film, the color uniformity of the surface of the fixing ring is improved, the surface gloss of the fixing ring is protected from being corroded or oxidized, and the color of the surface of the fixing ring is further uniform and full. This frock includes chassis, roof-rack, evenly sets up in a plurality of branches of chassis and roof-rack outward flange, is fixed with a plurality of evenly distributed and high permeability's tray between the branch, and then increases the solid fixed ring area of contact and the contact velocity of atmosphere through the material frame that sets up high permeability for atmosphere can be more even cage cover stationary ring surface, has improved the quality and the glossiness after solid fixed ring handles.
Description
Technical Field
The invention relates to the field of tufftride treatment, in particular to a tufftride treatment process of a fixed ring.
Background
Nitrocarburizing is nitrocarburizing, which is not a single carburizing or nitriding but a nitriding based on nitriding and is a surface treatment process for carburizing. The temperature of the soft nitriding is lower than that of carburizing, but higher than that of nitriding, generally about 570 ℃, and different from the condition that the quenching needs to be reheated after carburizing, the quenching is directly carried out after heat preservation, and a heating procedure is saved.
Because some soft nitriding products are appearance parts, such as export, foreign trade and other high-precision products which require uniform black and dark, because the oil liquid has short oxidation time to the workpiece, the products have large surface color difference due to uneven cooling and uneven oxidation effect, and the color and luster of the surface of the workpiece are uneven and need to be improved.
Disclosure of Invention
The invention aims to provide a tufftride treatment process of a fixed ring, which has the effect of improving the surface color uniformity of the fixed ring.
The technical purpose of the invention is realized by the following technical scheme: a soft nitriding treatment process of a fixed ring comprises the following steps:
s1: degreasing and cleaning, namely immersing the fixing ring into 75% ethanol solution for 0.1-0.2h, and removing oil stains on the surface of the fixing ring;
s2: charging, namely, after the fixing ring is flatly and uniformly placed in the tool, placing the tool and the fixing ring in a heating furnace together, and sealing the heating furnace;
s3: exhausting, namely continuously introducing nitrogen into the heating furnace, wherein the introduction amount of the nitrogen is 100-;
s4: heating and ventilating, namely heating the heating furnace until the temperature in the heating furnace reaches 540-;
s5: cooling, namely taking the fixing ring out of the heating furnace, and quickly cooling the fixing ring;
s6: steam treatment, namely reducing the temperature in the heating furnace to 550-570 ℃, then reloading the cooled fixing ring into the furnace, continuously introducing steam into the heating furnace, and keeping the temperature for 2-2.5 h;
s7: and discharging, taking the fixing ring out of the heating furnace, and cooling again.
Through adopting above-mentioned technical scheme, when the retainer plate tufftride, through continuously leading to steam in to the heating furnace for retainer plate surface color and luster after the tufftride is even, improves the color and luster degree of consistency on its surface. Meanwhile, a layer of compact oxide film is generated on the surface of the fixing ring, so that the quality of the fixing ring is greatly improved, the luster of the surface is protected from being corroded or oxidized, and the color uniformity of the surface of the fixing ring is further improved.
The invention is further provided with: in step S6, the pressure in the heating furnace is 0.7. + -. 0.1 MPa.
Through adopting above-mentioned technical scheme, set up to high atmospheric pressure through the atmospheric pressure with in the heating furnace, the effectual degree of depth that increases the permeable stratum avoids its surface decarbonization phenomenon to appear, reduces the deformation when the retainer plate is handled, makes its surperficial color and luster more even, can accelerate the processing speed of retainer plate simultaneously, improves the treatment effeciency of retainer plate.
The invention is further provided with: in step S4, the decomposition rate of ammonia gas is 20 to 30%.
By adopting the technical scheme, the lower the ammonia decomposition rate is, the stronger the capability of providing nitriding ions for the fixing ring is, the higher the nitriding speed is, the higher the hardness of the effective nitriding layer is, but the too low ammonia decomposition rate easily enables the surface layer of the fixing ring to form a brittle white layer, and on the contrary, the hardness of the effective nitriding layer is reduced, so that the requirement is met just by setting the ammonia decomposition rate of 20-30%, the quality of the treated fixing ring is improved, the color uniformity of the surface of the fixing ring is improved, and the color of the fixing ring is more uniform and full.
The invention is further provided with: the cooling method in step S5 is air cooling.
Through adopting above-mentioned technical scheme, through setting up the air-cooled cooling method, can cool down the retainer plate rapidly, improve the hardenability of retainer plate to make its layer depth more even, and then make the color and luster on retainer plate surface even more full. Simultaneously the forced air cooling can be directly weathered the raffinate on retainer plate surface, avoids the retainer plate to receive the corruption and influence the glossiness, and then further improves the color and luster degree of consistency on retainer plate surface.
The invention is further provided with: the cooling method in step S7 is air cooling.
Through adopting above-mentioned technical scheme, make the retainer plate slowly cool down through the cooling method that sets up the air cooling, and then eliminate the internal stress in the retainer plate, improve its ductility or toughness, prevent retainer plate deformation and fracture to make its color and luster, hardness, the intensity toughness of slow adjustment retainer plate, make it reach the performance requirement, improve the surperficial color and luster degree of consistency of retainer plate, increased the life in retainer plate later stage simultaneously.
The invention is further provided with: a citric acid solution is added to the ethanol solution in step S1.
By adopting the technical scheme, the citric acid has the effect of a builder, so that the performance of a washing product can be further improved, metal ions can be rapidly precipitated, pollutants are prevented from being attached to the fabric again, dirt and ash are dispersed and suspended, and the cleanliness of the fixing ring is greatly improved.
The invention is further provided with: in step S2, before the retainer ring is loaded into the furnace, the retainer ring is immersed into the treatment liquid for 0.2-0.3h, and the treatment liquid is a mixed solution of salicylic acid and glycolic acid.
By adopting the technical scheme, when the fixing ring is subjected to heating treatment, salicylic acid and glycolic acid are subjected to thermal decomposition, ions and radicals subjected to thermal decomposition can permeate into the fixing ring, and the salicylic acid can effectively remove a peeling layer on the surface of the fixing ring, is stable in performance and can effectively keep the glossiness of the fixing ring; meanwhile, the glycolic acid has the advantages of corrosion resistance, quick reaction, good finish and the like, so that the glossiness of the surface of the fixing ring is greatly improved, and the surface of the fixing ring is more uniform and full in color.
The invention also aims to provide a soft nitriding treatment tool for a fixed ring, which comprises an underframe, a top frame and a plurality of supporting rods uniformly arranged at the outer edges of the underframe and the top frame, wherein a plurality of trays uniformly arranged along the height direction of the supporting rods are fixed between the supporting rods, and the trays are positioned between the underframe and the top frame.
Through adopting above-mentioned technical scheme, when placing the retainer plate, place the retainer plate in the tray smoothly, and then make and keep interval and interval unanimous between each layer retainer plate, and then make when leading to steam, ammonia and carbon dioxide, steam, ammonia and carbon dioxide can more even contact retainer plate surface, influence it when avoiding the retainer plate to paste and ooze the quality altogether, and then improved the effect of tufftride processing, the quality of retainer plate has been improved, make the color and luster on retainer plate surface more even full simultaneously.
The invention is further provided with: the tray comprises a ring body fixed among the plurality of supporting rods and a net body arranged on the inner wall of the lower end of the ring body.
Through adopting above-mentioned technical scheme, through setting up netted tray, make steam, ammonia and carbon dioxide can directly flow from top to bottom, and then increased the area of contact and the contact velocity of retainer plate and steam, ammonia and carbon dioxide, make steam, ammonia and carbon dioxide can be more even cage cover retainer plate surface, improved the efficiency of tufftride, simultaneously further improvement the quality of retainer plate, also further make the color and luster on retainer plate surface more even full.
In conclusion, the invention has the following beneficial effects:
1. when the fixing ring is subjected to the soft nitriding treatment, steam is continuously introduced into the heating furnace, so that a layer of compact oxide film is uniformly generated on the surface of the fixing ring subjected to the soft nitriding treatment, the color uniformity of the surface of the fixing ring is further improved, the surface gloss of the fixing ring is protected from being corroded or oxidized, and the color of the surface of the fixing ring is further uniform and full;
2. the high pressure and the low ammonia decomposition rate are set, so that the capability of nitriding ions and the nitriding speed are improved, the hardness of a nitriding layer is effectively improved, and the color of the surface of the fixing ring is more uniform and full;
3. the fixing ring is cleaned by the ethanol solution and the citric acid solution, so that pollutants are prevented from being attached to the surface of the fixing ring again, dirt and ash are dispersed and suspended, and the cleanliness of the fixing ring is greatly improved;
4. the peeling layer on the surface of the fixing ring is effectively removed through the mixed solution of salicylic acid and glycolic acid, the glossiness of the surface of the fixing ring is improved, and the color of the surface of the fixing ring is further more uniform and full;
5. through the area of contact and the contact velocity of material frame increase retainer plate through setting up high permeability and atmosphere for atmosphere can be more even cage cover retainer plate surface, has improved quality and glossiness after the retainer plate is handled.
Drawings
FIG. 1 is a schematic structural view of a tool according to embodiment 2;
fig. 2 is a schematic structural view of the tray of embodiment 2.
Reference numerals: 1. a chassis; 2. a top frame; 3. a strut; 4. a tray; 41. a ring body; 42. a net body.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: a soft nitriding treatment process of a fixed ring comprises the following steps:
s1: degreasing and cleaning, namely immersing the fixing ring into a mixed solution of 75% ethanol and citric acid for 0.1-0.2h, and removing oil stains on the surface of the fixing ring;
the fixed ring is cleaned by the ethanol solution and the citric acid solution, so that the performance of a washing product is further improved, metal ions can be rapidly precipitated, pollutants are prevented from being attached to the fabric again, dirt and ash are dispersed and suspended, and the cleanliness of the fixed ring is greatly improved;
s2: charging, namely immersing the fixed ring into a treatment solution for 0.2-0.3h, wherein the treatment solution is a mixed solution of salicylic acid and glycolic acid, fishing out the fixed ring, flatly and uniformly placing the fixed ring into a tool, placing the tool and the fixed ring into a heating furnace, and sealing the heating furnace;
when the fixing ring is subjected to heating treatment, salicylic acid and glycolic acid are subjected to thermal decomposition, ions and radicals subjected to thermal decomposition penetrate into the fixing ring, and the salicylic acid can effectively remove a peeling layer on the surface of the fixing ring, is stable in performance and can effectively keep the glossiness of the fixing ring; meanwhile, the glycolic acid has the advantages of corrosion resistance, quick reaction, good finish and the like, so that the glossiness of the surface of the fixing ring is greatly improved, and the surface of the fixing ring is more uniform and full in color;
s3: exhausting, namely continuously introducing nitrogen into the heating furnace, wherein the introduction amount of the nitrogen is 100-;
s4: heating and ventilating, namely heating the heating furnace until the temperature in the heating furnace reaches 540-;
because the lower the ammonia decomposition rate, the stronger the capability of providing nitriding ions for the fixed ring, the higher the nitriding speed, the higher the hardness of the effective nitriding layer, but the too low ammonia decomposition rate can easily cause the surface layer of the fixed ring to form a brittle white layer, but can reduce the hardness of the effective nitriding layer, so that the requirement can be met just by setting the ammonia decomposition rate of 20-30%, the quality of the treated fixed ring is improved, the color uniformity of the surface of the treated fixed ring is improved, and the color of the treated fixed ring is more uniform and full;
s5: cooling, namely taking the fixing ring out of the heating furnace, and quickly cooling the fixing ring in an air cooling mode;
the cooling mode through setting up the forced air cooling is cooled down the retainer plate rapidly, improves the hardenability of retainer plate. Simultaneously the forced air cooling can be directly weathered the raffinate on retainer plate surface, avoids the retainer plate to receive the corruption and influences the glossiness, and then further improves the color and luster degree of consistency and the plumpness on retainer plate surface.
S6: steam treatment, namely reducing the temperature in the heating furnace to 550-570 ℃, then reloading the cooled fixing ring into the furnace, continuously introducing steam into the heating furnace, and keeping the temperature for 2-2.5 h;
when the retainer plate is subjected to the tufftride treatment, steam is continuously introduced into the heating furnace, so that the surface color of the retainer plate subjected to the tufftride treatment is uniform, and the surface color uniformity is improved. Meanwhile, a layer of compact oxide film is generated on the surface of the fixed ring, so that the quality of the fixed ring is greatly improved, the luster of the surface is protected from being corroded or oxidized, and the color uniformity of the surface of the fixed ring is further improved;
s7: and discharging, taking the fixing ring out of the heating furnace, and cooling again, wherein the cooling mode is air cooling.
| Item | Ordinary soft nitriding | This example |
| Surface hardness | 480±1HV | Greater than 500 +/-0.2 HV |
| Depth of white and bright layer | 11-18μm | 15-23μm |
| Color and luster | Non-uniform and striped | Is uniform and full |
| Salt spray test | 60-80h | Greater than 100h |
Example 2: the utility model provides a tufftride processing frock of retainer plate, as shown in figure 1, figure 2, including chassis 1, roof-rack 2, evenly set up in a plurality of branches 3 of chassis 1 and 2 outward flanges of roof-rack, be fixed with a plurality of tray 4 that evenly set up along 3 direction of height of branch between the branch 3, a plurality of tray 4 are located between chassis 1 and the roof-rack 2, tray 4 including be fixed in ring body 41 between a plurality of branches 3, set up in the dictyosome 42 of ring body 41 lower extreme inner wall.
When placing the retainer plate, place the retainer plate in tray 4 smoothly, and then make and keep interval and interval unanimous between each layer retainer plate, and through setting up netted tray 4, and then make and lead to steam, when ammonia and carbon dioxide, steam, ammonia and carbon dioxide can directly flow from top to bottom, and contact retainer plate surface that can be more even, influence it when avoiding the retainer plate to paste and ooze the quality altogether, and then improved the effect of tufftride processing, the quality of retainer plate has been improved, make the color and luster on retainer plate surface more even full simultaneously.
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (4)
1. A soft nitriding treatment process of a fixing ring is characterized by comprising the following steps: the method comprises the following steps:
s1: degreasing and cleaning, namely immersing the fixing ring into 75% ethanol solution for 0.1-0.2h to remove oil stains on the surface of the fixing ring, wherein citric acid solution is added into the ethanol solution;
s2: charging, namely, after the fixing ring is flatly and uniformly placed in the tool, placing the tool and the fixing ring in a heating furnace together, and sealing the heating furnace;
s3: exhausting, namely continuously introducing nitrogen into the heating furnace, wherein the introduction amount of the nitrogen is 100-;
s4: heating and ventilating, namely heating the heating furnace until the temperature in the heating furnace reaches 540-;
s5: cooling, namely taking the fixing ring out of the heating furnace, and rapidly cooling the fixing ring by adopting an air cooling mode;
s6: steam treatment, namely reducing the temperature in the heating furnace to 550-570 ℃, then reloading the cooled fixing ring into the furnace, continuously introducing steam into the heating furnace, and keeping the temperature for 2-2.5 h;
s7: and discharging, taking the fixing ring out of the heating furnace, and rapidly cooling the fixing ring again by adopting an air cooling mode.
2. The tufftride treatment process of a retainer ring according to claim 1, wherein: in step S6, the pressure in the heating furnace is 0.7. + -. 0.1 MPa.
3. The tufftride treatment process of a retainer ring according to claim 1, wherein: in step S4, the decomposition rate of ammonia gas is 20 to 30%.
4. The tufftride treatment process of a retainer ring according to claim 1, wherein: in step S2, before the retainer ring is loaded into the furnace, the retainer ring is immersed into the treatment liquid for 0.2-0.3h, and the treatment liquid is a mixed solution of salicylic acid and glycolic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811096829.0A CN109112467B (en) | 2018-09-19 | 2018-09-19 | Soft nitriding treatment process for fixing ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811096829.0A CN109112467B (en) | 2018-09-19 | 2018-09-19 | Soft nitriding treatment process for fixing ring |
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| Publication Number | Publication Date |
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| CN109112467A CN109112467A (en) | 2019-01-01 |
| CN109112467B true CN109112467B (en) | 2020-11-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1441091A (en) * | 1972-08-15 | 1976-06-30 | Barkas Werke Veb | Treatment of piston rods |
| CN1982496A (en) * | 2005-12-12 | 2007-06-20 | 梅塔普拉斯亿欧侬表面精制技术有限责任公司 | Process of gas-nitriding a surface of a workpiece without forming a bond layer, and workpiece |
| CN103898438B (en) * | 2014-04-24 | 2016-03-09 | 鑫光热处理工业(昆山)有限公司 | Gas nitrocarburizing and water vapour composite treatment process |
| CN106756760A (en) * | 2017-01-17 | 2017-05-31 | 重庆长安汽车股份有限公司 | A kind of automobile brake disc wear resistant processing method |
| CN208883970U (en) * | 2018-08-15 | 2019-05-21 | 温岭市大山热处理厂（普通合伙） | A kind of tufftride ancillary equipment |
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