CN112853259A - Low-stress screw carburizing and quenching process - Google Patents
Low-stress screw carburizing and quenching process Download PDFInfo
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- CN112853259A CN112853259A CN202110011757.0A CN202110011757A CN112853259A CN 112853259 A CN112853259 A CN 112853259A CN 202110011757 A CN202110011757 A CN 202110011757A CN 112853259 A CN112853259 A CN 112853259A
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- 238000010791 quenching Methods 0.000 title claims abstract description 121
- 230000000171 quenching effect Effects 0.000 title claims abstract description 121
- 238000005255 carburizing Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 115
- 238000001816 cooling Methods 0.000 claims abstract description 62
- 238000005496 tempering Methods 0.000 claims abstract description 26
- 238000004321 preservation Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 11
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
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- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 10
- 239000003345 natural gas Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000003381 stabilizer Substances 0.000 claims description 10
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- PSGCQDPCAWOCSH-UHFFFAOYSA-N (4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl) prop-2-enoate Chemical compound C1CC2(C)C(OC(=O)C=C)CC1C2(C)C PSGCQDPCAWOCSH-UHFFFAOYSA-N 0.000 claims description 5
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical compound FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 claims description 5
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- BTXFTCVNWMNXKH-UHFFFAOYSA-N NC1=CC=CC=C1.CCO[Si](C)(OCC)OCC Chemical compound NC1=CC=CC=C1.CCO[Si](C)(OCC)OCC BTXFTCVNWMNXKH-UHFFFAOYSA-N 0.000 claims description 5
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 5
- 239000005842 Thiophanate-methyl Substances 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- BAECOWNUKCLBPZ-HIUWNOOHSA-N Triolein Natural products O([C@H](OCC(=O)CCCCCCC/C=C\CCCCCCCC)COC(=O)CCCCCCC/C=C\CCCCCCCC)C(=O)CCCCCCC/C=C\CCCCCCCC BAECOWNUKCLBPZ-HIUWNOOHSA-N 0.000 claims description 5
- PHYFQTYBJUILEZ-UHFFFAOYSA-N Trioleoylglycerol Natural products CCCCCCCCC=CCCCCCCCC(=O)OCC(OC(=O)CCCCCCCC=CCCCCCCCC)COC(=O)CCCCCCCC=CCCCCCCCC PHYFQTYBJUILEZ-UHFFFAOYSA-N 0.000 claims description 5
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 claims description 5
- 239000002199 base oil Substances 0.000 claims description 5
- OOCMUZJPDXYRFD-UHFFFAOYSA-L calcium;2-dodecylbenzenesulfonate Chemical compound [Ca+2].CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O.CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O OOCMUZJPDXYRFD-UHFFFAOYSA-L 0.000 claims description 5
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- TXSUIVPRHHQNTM-UHFFFAOYSA-N n'-(3-methylanilino)-n-phenyliminobenzenecarboximidamide Chemical compound CC1=CC=CC(NN=C(N=NC=2C=CC=CC=2)C=2C=CC=CC=2)=C1 TXSUIVPRHHQNTM-UHFFFAOYSA-N 0.000 claims description 5
- IYSYLWYGCWTJSG-XFXZXTDPSA-N n-tert-butyl-1-phenylmethanimine oxide Chemical compound CC(C)(C)[N+](\[O-])=C\C1=CC=CC=C1 IYSYLWYGCWTJSG-XFXZXTDPSA-N 0.000 claims description 5
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- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 claims description 5
- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-UHFFFAOYSA-N 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 5
- 229920013639 polyalphaolefin Polymers 0.000 claims description 5
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 5
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 239000011591 potassium Substances 0.000 claims description 5
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- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims description 5
- 235000010234 sodium benzoate Nutrition 0.000 claims description 5
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- 239000001593 sorbitan monooleate Substances 0.000 claims description 5
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- 229940035049 sorbitan monooleate Drugs 0.000 claims description 5
- 229960002317 succinimide Drugs 0.000 claims description 5
- 150000003505 terpenes Chemical class 0.000 claims description 5
- 235000007586 terpenes Nutrition 0.000 claims description 5
- QGHREAKMXXNCOA-UHFFFAOYSA-N thiophanate-methyl Chemical group COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC QGHREAKMXXNCOA-UHFFFAOYSA-N 0.000 claims description 5
- PHYFQTYBJUILEZ-IUPFWZBJSA-N triolein Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC(OC(=O)CCCCCCC\C=C/CCCCCCCC)COC(=O)CCCCCCC\C=C/CCCCCCCC PHYFQTYBJUILEZ-IUPFWZBJSA-N 0.000 claims description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- 235000011187 glycerol Nutrition 0.000 claims description 2
- 229940117972 triolein Drugs 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000013256 coordination polymer Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 239000007769 metal material Substances 0.000 description 1
Classifications
-
- 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
- C23C8/08—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 only one element being applied
- C23C8/20—Carburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/58—Oils
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a low-stress screw carburizing and quenching process, which comprises the following steps: s1: carburizing: s11, primary carburization; s12: air cooling to room temperature; s13: performing secondary carburization; s14: water cooling to room temperature; s2: quenching; s21: primary quenching, wherein the workpiece is subjected to quenching and heating treatment, the quenching heat preservation temperature is 820-; immersing the workpiece into quenching oil after quenching and heating, and keeping the temperature of the quenching oil at 70-85 ℃ for 0.5-1.5 h; s22, cooling the workpiece subjected to primary quenching to room temperature and then cleaning; s3: tempering; s31: high-temperature tempering, namely preheating the heating furnace to the temperature of 350-; s32: low temperature tempering, heating the workpiece to 140-.
Description
Technical Field
The invention belongs to the technical field of screw production processes, and particularly relates to a low-stress screw carburizing and quenching process.
Background
Carburizing and quenching are common heat treatment processes for metal materials, and can ensure that the surface of a workpiece which is carburized by carbon obtains high hardness and improve the wear resistance of the workpiece. The traditional process mainly comprises the following steps: low temperature tempering, precooling direct quenching, primary heating quenching, carburizing high temperature tempering, secondary quenching cold treatment, induction heating after carburizing and the like. Quenching processes are widely used in the modern mechanical manufacturing industry. For the screw, the application field is wide, the shadow of the screw can be seen at almost every corner in life, the requirements for the screw are greatly improved under the application scenes of high requirements, large vibration or large alternating load, the strength, hardness and brittleness of the screw are required to be better, and the traditional screw cannot meet the use requirements.
Disclosure of Invention
The invention aims to provide a low-stress screw carburizing and quenching process, which aims to solve the technical problems in the background technology.
In order to solve the technical problem, the invention aims to realize that:
a low-stress screw carburizing and quenching process comprises the following steps:
s1: carburizing: s11, carburizing for the first time, namely preheating the heating furnace to 550 ℃, placing the workpiece in the heating furnace, heating to 825 ℃, preserving heat for 0.5h, heating the heating furnace from room temperature to 900-950 ℃ for carburizing, wherein the carburizing time is 1-2.5 h; s12: air cooling, namely, performing air cooling on the workpiece subjected to primary carburization to accelerate the workpiece to be cooled to room temperature at a cooling rate of 10-12 ℃/s; s13: secondary carburization, namely preheating the heating furnace to 550 ℃, placing the workpiece in the heating furnace, raising the temperature of the heating furnace from room temperature to 600-; s14: water cooling, namely cooling the workpiece subjected to secondary carburization to room temperature at a cooling rate of 13-15 ℃/s by adopting water cooling;
s2: quenching; s21: primary quenching, namely putting the workpiece subjected to the secondary carburization treatment into a well-type natural gas heating furnace, carrying out quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 820-850 ℃, and introducing methanol into the heating furnace at the speed of 0.01 ml/min for 2.5-3.5 h; immersing the workpiece into quenching oil after quenching and heating, and keeping the temperature of the quenching oil at 70-85 ℃ for 0.5-1.5 h; s22, cooling the workpiece subjected to primary quenching to room temperature and then cleaning;
s3: tempering; s31: high-temperature tempering, namely preheating the heating furnace to the temperature of 350-; s32: low temperature tempering, heating the workpiece to 140-.
On the basis of the above scheme and as a preferable scheme of the scheme: the step S2 further includes S23: performing secondary quenching, namely putting the cleaned workpiece into a well-type natural gas heating furnace, and performing secondary quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 650 +/-10 ℃, and the heat preservation time is 1-1.5 hours; immersing the workpiece into quenching oil after quenching and heating, and keeping the temperature of the quenching oil at 90-105 ℃ for 0.5-1.5 h; s24: and cooling the workpiece subjected to secondary quenching to room temperature and then cleaning.
On the basis of the above scheme and as a preferable scheme of the scheme: the quenching oil in the step S23 comprises the following components in percentage by mass: sorbitan monooleate: 1.89-2.16%, glycerin mono fatty acid ester: 1.12-1.26%, calcium dodecylbenzenesulfonate: 0.19-0.31%, octylphenol polyoxyethylene ether: 0.29-0.34%, terpene resin: 0.45-0.66%, chlorinated paraffin: 1.52-1.78%, dicyclopentadiene: 0.43-0.56%, triolein: 0.45-0.75%, dialkyl diphenylamine: 0.29-0.53%, oil phenolic resin: 1.32-1.56%, triethanolamine: 0.11-0.23%, polyoxyethylene abietate: 0.46-0.61%, poly-alpha-olefin: 0.89-0.99%, aniline methyl triethoxysilane: 0.23-0.37%, sodium benzoate: 0.09-0.16%, potassium molybdate: 0.21-0.36%, composite auxiliary agent: 1.55-1.66%, modified stabilizer: 0.82-1.23% and the balance of 60SN base oil.
On the basis of the above scheme and as a preferable scheme of the scheme: the modified stabilizer in the quenching oil is prepared from the following raw materials in parts by weight: 7-12 parts of calcium ricinoleate, 6-8 parts of distearoyl isopropoxy aluminate, 6-9 parts of amine sulfonate, 2-3 parts of thiophanate methyl and 6-7 parts of phenyl-N-tert-butyl nitrone.
On the basis of the above scheme and as a preferable scheme of the scheme: the composite auxiliary in the quenching oil is prepared from the following raw materials in parts by weight: 3-4 parts of glycidyl acrylate, 1-2 parts of isobornyl acrylate, 3-5 parts of dimethyl silicone oil, 0.5-1 part of boronized diene-based succinimide and 0.3-0.5 part of oleamide.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that: according to the carburizing and quenching process, because the carburizing operation is performed twice, the time of each carburizing is shortened, and the stepped temperature rise process is adopted, the defects of low metal hardness, reduction of fatigue resistance and wear resistance, and the like caused by long-time heating can be effectively prevented, the service life of a workpiece is greatly prolonged, the residual stress of the workpiece can be well released, and the service life is prolonged. In addition, the stress of the screw core part is further reduced by preheating the heating furnace and then combining a stepped heating mode, the surface hardness and the strength are improved, and meanwhile, the core part is ensured to have good toughness and plasticity, so that the fatigue resistance of the screw is improved.
Detailed Description
To make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be clearly and completely described below with reference to the embodiments,
example one
A low-stress screw carburizing and quenching process comprises the following steps:
s1: carburizing: s11, carburizing for the first time, namely preheating a heating furnace to 550 ℃, placing the workpiece in the heating furnace, heating to 825 ℃, keeping the temperature for 0.5h, heating the heating furnace from room temperature to 900 ℃ for carburizing, wherein the carburizing time is 1 h; s12: air cooling, namely, performing air cooling on the workpiece subjected to primary carburization to accelerate the cooling of the workpiece to room temperature at a cooling rate of 10 ℃/s; s13: secondary carburization, namely preheating a heating furnace to 550 ℃, placing a workpiece in the heating furnace, raising the temperature of the heating furnace from room temperature to 600 ℃, preserving heat for 0.5h, then raising the temperature to 830 ℃ at the speed of 15 ℃/s, continuously preserving heat for 0.5h, continuously raising the temperature of the furnace to 900 ℃ to carburize, wherein the carburization time is 2h, the carbon potential CP in the strong carburization stage in the carburization is 1.12C%, and the carbon potential CP in the diffusion stage is 0.75C%; s14: water cooling, namely cooling the workpiece subjected to secondary carburization to room temperature at a cooling rate of 13 ℃/s by adopting water cooling;
s2: quenching; s21: primary quenching, namely putting the workpiece subjected to the secondary carburization treatment into a well-type natural gas heating furnace, carrying out quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 820 ℃, and introducing methanol into the heating furnace at a speed of 0.01 ml/min for 2.5 h; after quenching and heating are finished, the workpiece is immersed into quenching oil, and the temperature of the quenching oil is kept at 70 ℃ for 0.5 h; s22, cooling the workpiece subjected to primary quenching to room temperature and then cleaning; in this embodiment, it is further preferable that the step S2 further includes S23: secondary quenching, namely putting the cleaned workpiece into a well-type natural gas heating furnace, and carrying out secondary quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 640 ℃ and the heat preservation time is 1 h; immersing the workpiece into quenching oil after quenching and heating, and keeping the temperature of the quenching oil at 90-105 ℃ for 0.5 h; s24: and cooling the workpiece subjected to secondary quenching to room temperature and then cleaning. The quenching oil in the step S23 comprises the following components in percentage by mass: sorbitan monooleate: 1.89%, fatty acid monoglyceride: 1.12%, calcium dodecylbenzenesulfonate: 0.19%, octylphenol polyoxyethylene ether: 0.29%, terpene resin: 0.45%, chlorinated paraffin: 1.52%, dicyclopentadiene: 0.43%, glycerol trioleate: 0.45%, dialkyl diphenylamine: 0.29%, oleophenolic resin: 1.32%, triethanolamine: 0.11%, polyoxyethylene abietate: 0.46%, poly- α -olefin: 0.89%, aniline methyl triethoxysilane: 0.23%, sodium benzoate: 0.09%, potassium molybdate: 0.21%, composite additive: 1.55%, modified stabilizer: 0.82 percent, and the balance of 60SN base oil. Preferably, the modified stabilizer in the quenching oil is prepared from the following raw materials in parts by weight: 7 parts of calcium ricinoleate, 6 parts of distearoyl isopropoxy aluminate, 6 parts of amine sulfonate, 2 parts of thiophanate methyl and 6 parts of phenyl-N-tert-butyl nitrone. Preferably, the composite auxiliary in the quenching oil is prepared from the following raw materials in parts by weight: 3 parts of glycidyl acrylate, 1 part of isobornyl acrylate, 3 parts of dimethyl silicone oil, 0.5 part of boronized diene succinimide and 0.3 part of oleamide.
S3: tempering; s31: high-temperature tempering, namely preheating a heating furnace to 350 ℃, putting the workpiece into the heating furnace at one time, heating the workpiece to 650 ℃, tempering for 1h, cooling the workpiece to 220 ℃ at a cooling rate of 13 ℃/s by adopting water cooling, and then preserving heat for 1.5 h; s32: low temperature tempering, heating the workpiece to 140 ℃, tempering for 2.5h, and then air cooling to room temperature.
According to the carburizing and quenching process, because the carburizing operation is performed twice, the time of each carburizing is shortened, and the stepped temperature rise process is adopted, the defects of low metal hardness, reduction of fatigue resistance and wear resistance, and the like caused by long-time heating can be effectively prevented, the service life of a workpiece is greatly prolonged, the residual stress of the workpiece can be well released, and the service life is prolonged. In addition, the stress of the screw core part is further reduced by preheating the heating furnace and then combining a stepped heating mode, the surface hardness and the strength are improved, and meanwhile, the core part is ensured to have good toughness and plasticity, so that the fatigue resistance of the screw is improved.
Example two
A low-stress screw carburizing and quenching process comprises the following steps:
s1: carburizing: s11, carburizing for the first time, namely preheating a heating furnace to 550 ℃, placing the workpiece in the heating furnace, heating to 825 ℃, keeping the temperature for 0.5h, heating the heating furnace from room temperature to 925 ℃ for carburizing, wherein the carburizing time is 1.75 h; s12: air cooling, namely, performing air cooling on the workpiece subjected to primary carburization to accelerate the workpiece to be cooled to room temperature at a cooling rate of 11 ℃/s; s13: secondary carburization, namely preheating a heating furnace to 550 ℃, placing the workpiece in the heating furnace, heating the heating furnace from room temperature to 625 ℃, preserving heat for 0.5h, then heating to 845 ℃ at the speed of 17.5 ℃/s, continuously preserving heat for 0.5-1h, continuously heating the furnace to 925 ℃ to carburize, wherein the carburization time is 2.5h, the carbon potential CP of a strong carburization stage in the carburization is 1.13C%, and the carbon potential CP of a diffusion stage is 0.8C%; s14: water cooling, namely cooling the workpiece subjected to secondary carburization to room temperature at a cooling rate of 14 ℃/s by adopting water cooling;
s2: quenching; s21: primary quenching, namely putting the workpiece subjected to the secondary carburization treatment into a well-type natural gas heating furnace, carrying out quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 835 ℃, and introducing methanol into the heating furnace at a speed of 0.01 ml/min for 3 h; after quenching and heating are finished, the workpiece is immersed into quenching oil, and the temperature of the quenching oil is kept at 80 ℃ for 1 h; s22, cooling the workpiece subjected to primary quenching to room temperature and then cleaning; in this embodiment, it is further preferable that the step S2 further includes S23: secondary quenching, namely putting the cleaned workpiece into a well-type natural gas heating furnace, and carrying out secondary quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 650 ℃, and the heat preservation time is 1.2 h; after quenching and heating are finished, the workpiece is immersed into quenching oil, and the temperature of the quenching oil is kept at 108 ℃ for 1 h; s24: and cooling the workpiece subjected to secondary quenching to room temperature and then cleaning. The quenching oil in the step S23 comprises the following components in percentage by mass: sorbitan monooleate: 2%, fatty acid monoglyceride: 1.2%, calcium dodecylbenzenesulfonate: 0.23%, octylphenol polyoxyethylene ether: 0.32%, terpene resin: 0.55%, chlorinated paraffin: 1.62%, dicyclopentadiene: 0.5%, glycerol trioleate: 0.55%, dialkyl diphenylamine: 0.41%, oil phenolic resin: 1.44%, triethanolamine: 0.17%, polyoxyethylene abietate: 0.51%, poly- α -olefin: 0.93%, aniline methyl triethoxysilane: 0.3%, sodium benzoate: 0.125%, potassium molybdate: 0.28%, compound additive: 1.6%, modified stabilizer: 1.6 percent and the balance of 60SN base oil. Preferably, the modified stabilizer in the quenching oil is prepared from the following raw materials in parts by weight: 9.5 parts of calcium ricinoleate, 7 parts of distearoyl isopropoxy aluminate, 7.5 parts of amine sulfonate, 2.5 parts of thiophanate methyl and 6.5 parts of phenyl-N-tert-butyl nitrone. Preferably, the composite auxiliary in the quenching oil is prepared from the following raw materials in parts by weight: 3.5 parts of glycidyl acrylate, 1.5 parts of isobornyl acrylate, 4 parts of dimethyl silicone oil, 0.75 part of boronized diene succinimide and 0.4 part of oleamide.
S3: tempering; s31: high-temperature tempering, namely preheating a heating furnace to 365 ℃, putting the workpiece into the heating furnace at one time, heating the workpiece to 675 ℃ for tempering for 1.25h, cooling the workpiece to 250 ℃ at a cooling rate of 14 ℃/s by adopting water cooling, and then preserving heat for 1.75 h; s32: low temperature tempering, heating the workpiece to 148 ℃, tempering for 3h, and then air cooling to room temperature.
According to the carburizing and quenching process, because the carburizing operation is performed twice, the time of each carburizing is shortened, and the stepped temperature rise process is adopted, the defects of low metal hardness, reduction of fatigue resistance and wear resistance, and the like caused by long-time heating can be effectively prevented, the service life of a workpiece is greatly prolonged, the residual stress of the workpiece can be well released, and the service life is prolonged. In addition, the stress of the screw core part is further reduced by preheating the heating furnace and then combining a stepped heating mode, the surface hardness and the strength are improved, and meanwhile, the core part is ensured to have good toughness and plasticity, so that the fatigue resistance of the screw is improved.
EXAMPLE III
A low-stress screw carburizing and quenching process comprises the following steps:
s1: carburizing: s11, carburizing for the first time, namely preheating a heating furnace to 550 ℃, placing the workpiece in the heating furnace, heating to 825 ℃, keeping the temperature for 0.5h, heating the heating furnace from room temperature to 950 ℃ for carburizing, and carburizing for 2.5 h; s12: air cooling, namely, carrying out air cooling on the workpiece subjected to primary carburization to accelerate the cooling of the workpiece to room temperature at a cooling rate of 12 ℃/s; s13: secondary carburization, namely preheating a heating furnace to 550 ℃, placing a workpiece in the heating furnace, heating the heating furnace from room temperature to 650 ℃ for heat preservation for 0.5h, then heating to 860 ℃ at the speed of 20 ℃/s, continuing to preserve heat for 1h, and continuing to heat the furnace to 950 ℃ for carburization, wherein the carburization time is 3h, the carbon potential CP in the strong carburization stage in the carburization is 1.15C%, and the carbon potential CP in the diffusion stage is 0.85C%; s14: water cooling, namely cooling the workpiece subjected to secondary carburization to room temperature at a cooling rate of 15 ℃/s by adopting water cooling;
s2: quenching; s21: primary quenching, namely putting the workpiece subjected to the secondary carburization treatment into a well-type natural gas heating furnace, carrying out quenching and heating treatment on the workpiece, keeping the quenching temperature at 850 ℃, and introducing methanol into the heating furnace at the speed of 0.01 ml/min for 3.5 h; after quenching and heating are finished, the workpiece is immersed into quenching oil, and the temperature of the quenching oil is kept at 85 ℃ for 1.5 h; s22, cooling the workpiece subjected to primary quenching to room temperature and then cleaning; in this embodiment, it is further preferable that the step S2 further includes S23: secondary quenching, namely putting the cleaned workpiece into a well-type natural gas heating furnace, and carrying out secondary quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 650 +/-10 ℃, and the heat preservation time is 1.5 hours; immersing the workpiece into quenching oil after quenching and heating, and keeping the temperature of the quenching oil at 90-105 ℃ for 1.5 h; s24: and cooling the workpiece subjected to secondary quenching to room temperature and then cleaning. The quenching oil in the step S23 comprises the following components in percentage by mass: sorbitan monooleate: 2.16%, fatty acid monoglyceride: 1.26%, calcium dodecylbenzenesulfonate: 0.31%, octylphenol polyoxyethylene ether: 0.34%, terpene resin: 0.66%, chlorinated paraffin: 1.78%, dicyclopentadiene: 0.56%, glycerol trioleate: 0.75%, dialkyl diphenylamine: 0.53%, oil-based phenol resin: 1.56%, triethanolamine: 0.23%, polyoxyethylene abietate: 0.61%, poly- α -olefin: 0.99%, aniline methyl triethoxysilane: 0.37%, sodium benzoate: 0.16%, potassium molybdate: 0.36%, compound additive: 1.66%, modified stabilizer: 1.23 percent, and the balance of 60SN base oil. Preferably, the modified stabilizer in the quenching oil is prepared from the following raw materials in parts by weight: 12 parts of calcium ricinoleate, 8 parts of distearoyl isopropoxy aluminate, 9 parts of amine sulfonate, 3 parts of thiophanate methyl and 7 parts of phenyl-N-tert-butyl nitrone. Preferably, the composite auxiliary in the quenching oil is prepared from the following raw materials in parts by weight: 4 parts of glycidyl acrylate, 2 parts of isobornyl acrylate, 5 parts of dimethyl silicone oil, 1 part of boronized diene-based succinimide and 0.5 part of oleamide.
S3: tempering; s31: high-temperature tempering, namely preheating a heating furnace to 380 ℃, putting the workpiece into the heating furnace at one time, heating the workpiece to 700 ℃, tempering for 1.5h, cooling the workpiece to 280 ℃ at a cooling rate of 15 ℃/s by adopting water cooling, and then preserving heat for 2 h; s32: low temperature tempering, heating the workpiece to 155 ℃ for tempering for 3.5h, and then air cooling to room temperature.
According to the carburizing and quenching process, because the carburizing operation is performed twice, the time of each carburizing is shortened, and the stepped temperature rise process is adopted, the defects of low metal hardness, reduction of fatigue resistance and wear resistance, and the like caused by long-time heating can be effectively prevented, the service life of a workpiece is greatly prolonged, the residual stress of the workpiece can be well released, and the service life is prolonged. In addition, the stress of the screw core part is further reduced by preheating the heating furnace and then combining a stepped heating mode, the surface hardness and the strength are improved, and meanwhile, the core part is ensured to have good toughness and plasticity, so that the fatigue resistance of the screw is improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (5)
1. A low-stress screw carburizing and quenching process is characterized in that: the method comprises the following steps:
s1: carburizing: s11, carburizing for the first time, namely preheating the heating furnace to 550 ℃, placing the workpiece in the heating furnace, heating to 825 ℃, preserving heat for 0.5h, heating the heating furnace from room temperature to 900-950 ℃ for carburizing, wherein the carburizing time is 1-2.5 h; s12: air cooling, namely, performing air cooling on the workpiece subjected to primary carburization to accelerate the workpiece to be cooled to room temperature at a cooling rate of 10-12 ℃/s; s13: secondary carburization, namely preheating the heating furnace to 550 ℃, placing the workpiece in the heating furnace, raising the temperature of the heating furnace from room temperature to 600-; s14: water cooling, namely cooling the workpiece subjected to secondary carburization to room temperature at a cooling rate of 13-15 ℃/s by adopting water cooling;
s2: quenching; s21: primary quenching, namely putting the workpiece subjected to the secondary carburization treatment into a well-type natural gas heating furnace, carrying out quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 820-850 ℃, and introducing methanol into the heating furnace at the speed of 0.01 ml/min for 2.5-3.5 h; immersing the workpiece into quenching oil after quenching and heating, and keeping the temperature of the quenching oil at 70-85 ℃ for 0.5-1.5 h; s22, cooling the workpiece subjected to primary quenching to room temperature and then cleaning;
s3: tempering; s31: high-temperature tempering, namely preheating the heating furnace to the temperature of 350-; s32: low temperature tempering, heating the workpiece to 140-.
2. The low-stress screw carburizing and quenching process according to claim 1, characterized in that: the step S2 further includes S23: performing secondary quenching, namely putting the cleaned workpiece into a well-type natural gas heating furnace, and performing secondary quenching and heating treatment on the workpiece, wherein the quenching heat preservation temperature is 650 +/-10 ℃, and the heat preservation time is 1-1.5 hours; immersing the workpiece into quenching oil after quenching and heating, and keeping the temperature of the quenching oil at 90-105 ℃ for 0.5-1.5 h; s24: and cooling the workpiece subjected to secondary quenching to room temperature and then cleaning.
3. The low-stress screw carburizing and quenching process according to claim 1, characterized in that: the quenching oil in the step S23 comprises the following components in percentage by mass: sorbitan monooleate: 1.89-2.16%, glycerin mono fatty acid ester: 1.12-1.26%, calcium dodecylbenzenesulfonate: 0.19-0.31%, octylphenol polyoxyethylene ether: 0.29-0.34%, terpene resin: 0.45-0.66%, chlorinated paraffin: 1.52-1.78%, dicyclopentadiene: 0.43-0.56%, triolein: 0.45-0.75%, dialkyl diphenylamine: 0.29-0.53%, oil phenolic resin: 1.32-1.56%, triethanolamine: 0.11-0.23%, polyoxyethylene abietate: 0.46-0.61%, poly-alpha-olefin: 0.89-0.99%, aniline methyl triethoxysilane: 0.23-0.37%, sodium benzoate: 0.09-0.16%, potassium molybdate: 0.21-0.36%, composite auxiliary agent: 1.55-1.66%, modified stabilizer: 0.82-1.23% and the balance of 60SN base oil.
4. The low-stress screw carburizing and quenching process according to claim 3, characterized in that: the modified stabilizer in the quenching oil is prepared from the following raw materials in parts by weight: 7-12 parts of calcium ricinoleate, 6-8 parts of distearoyl isopropoxy aluminate, 6-9 parts of amine sulfonate, 2-3 parts of thiophanate methyl and 6-7 parts of phenyl-N-tert-butyl nitrone.
5. The low-stress screw carburizing and quenching process according to claim 3, characterized in that: the composite auxiliary in the quenching oil is prepared from the following raw materials in parts by weight: 3-4 parts of glycidyl acrylate, 1-2 parts of isobornyl acrylate, 3-5 parts of dimethyl silicone oil, 0.5-1 part of boronized diene-based succinimide and 0.3-0.5 part of oleamide.
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| CN113969389A (en) * | 2021-10-28 | 2022-01-25 | 惠州市思逸臻实业有限公司 | Low-temperature carburizing process for screw production |
| CN114990292A (en) * | 2021-11-22 | 2022-09-02 | 上海亿舜模具科技有限公司 | Heat treatment method for hot work die steel |
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| CN113564515A (en) * | 2021-08-05 | 2021-10-29 | 常州天山重工机械有限公司 | Surface modification process for improving wear resistance of carburizing steel |
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| CN113969389A (en) * | 2021-10-28 | 2022-01-25 | 惠州市思逸臻实业有限公司 | Low-temperature carburizing process for screw production |
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| CN117144228A (en) * | 2023-10-30 | 2023-12-01 | 江苏金迪特钢有限公司 | Low-temperature-resistant corrosion-resistant seamless steel pipe and processing technology thereof |
| CN117144228B (en) * | 2023-10-30 | 2023-12-26 | 江苏金迪特钢有限公司 | Low-temperature-resistant corrosion-resistant seamless steel pipe and processing technology thereof |
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