CN114672630A - Heat treatment process of fastener - Google Patents
Heat treatment process of fastener Download PDFInfo
- Publication number
- CN114672630A CN114672630A CN202210359525.9A CN202210359525A CN114672630A CN 114672630 A CN114672630 A CN 114672630A CN 202210359525 A CN202210359525 A CN 202210359525A CN 114672630 A CN114672630 A CN 114672630A
- Authority
- CN
- China
- Prior art keywords
- fastener
- temperature
- carburizing
- vacuum furnace
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005255 carburizing Methods 0.000 claims abstract description 30
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000001273 butane Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical group CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000000276 potassium ferrocyanide Substances 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 230000002929 anti-fatigue Effects 0.000 abstract description 2
- 238000005496 tempering Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003961 penetration enhancing agent Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C23C8/08—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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a heat treatment process of a fastener, which comprises the steps of heating, carburizing, tempering, tapping again and the like. The invention has the following advantages and effects: through under certain temperature, carry out tapping again to the fastener, can greatly increased fastener internal thread's wearability, antifatigue and corrosion resistance.
Description
Technical Field
The invention relates to the technical field of fastener production processes, in particular to a heat treatment process of a fastener.
Background
A fastener is a generic term for a type of mechanical parts used when two or more parts (or members) are fastened and connected as a whole. A wide variety of fasteners are found on a variety of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical, instrumentation, and the like.
After the fastener is manufactured, it needs to be heat treated to increase its surface hardness, and conventional heat treatment usually includes normalizing, quenching and tempering steps to increase the hardness and wear resistance of the fastener.
However, in use, because of the greater pressure on the fastener, particularly on a fastener with internal threads, the greater pressure on the internal threads, heat treatment in the conventional manner, while increasing the hardness, is still insufficient in mechanical strength as well as in wear resistance, fatigue resistance and corrosion resistance.
Disclosure of Invention
The invention aims to provide a heat treatment process of a fastener with stronger wear resistance, fatigue resistance and corrosion resistance.
The technical purpose of the invention is realized by the following technical scheme: the heat treatment process of the fastener comprises the following steps
The method comprises the following steps: cleaning the tapped fastener, putting the fastener into a vacuum furnace, raising the temperature in the vacuum furnace to 850-920 ℃, and continuously heating for 3 minutes after the temperature is raised to the preset temperature;
step two: transferring the heated fastener into a carburizing furnace, adding protective gas and a carburizing agent into the carburizing furnace, and performing carburizing treatment on the fastener, wherein the temperature in the carburizing furnace is controlled at 900-920 ℃, and the heat of the fastener is preserved for 2-4 h;
step three: cooling the heat-insulated carburizing furnace to 800-850 ℃, then carrying out heat insulation on the fastener for 15-30min, taking out the fastener from the carburizing furnace, and carrying out oil cooling to 60-90 ℃;
step four: heating the fastener in a vacuum furnace, keeping the temperature in the vacuum furnace at 450-;
step five: putting the fastener into a vacuum furnace for heating, raising the temperature in the vacuum furnace to 140-160 ℃ at the speed of 5-10 ℃/min, preserving the heat for 2h, and then taking out the fastener for naturally cooling to 80-90 ℃;
step six: and (4) placing the fastener on a tapping machine for tapping again, then placing the fastener into a vacuum furnace, heating to 140-160 ℃, preserving heat for 2h, and cooling to room temperature.
Further setting the following steps: and in the second step, the protection period is nitrogen, and the carburizing agent is butane.
Further setting the following steps: step two, a energizer is also adoptedIncluding Na2CO3Potassium ferrocyanide and wood dust.
Further setting the following steps: in the first step, the temperature in the vacuum furnace is increased at a rate of 20-25 ℃/min.
Further setting the following steps: in the fourth step, the temperature in the vacuum furnace is increased at a speed of 5-10 ℃/min.
In conclusion, the invention has the following beneficial effects: through under certain temperature, carry out tapping again to the fastener, can greatly increased fastener internal thread's wearability, antifatigue and corrosion resistance.
Detailed Description
The present invention will be described in further detail below.
The heat treatment process of the fastener comprises the following steps,
the method comprises the following steps: and cleaning the tapped fastener, and putting the fastener into a vacuum furnace, wherein the depth of the first tapped screw is 0.1mm smaller than that of the screw with the designed size. Then the temperature in the vacuum furnace is raised to 850-920 ℃, and the temperature raising speed is 20-25 ℃/min. Heating was continued for 3 minutes after the temperature was raised to the predetermined temperature of 850-.
Step two: and transferring the heated fastener into a carburizing furnace, and adding protective gas and a carburizing agent into the carburizing furnace to perform carburizing treatment on the fastener. The protective gas is nitrogen, and the carburizing agent is butane. An accelerant agent is also added into the carburizing furnace, and the accelerant agent can accelerate the carburizing operation and greatly reduce the carburizing time. The penetration enhancer comprises Na2CO3Potassium ferrocyanide and wood dust. Controlling the temperature in the carburizing furnace at 900-920 ℃ during carburizing, and keeping the whole carburizing time for 2-4 h;
step three: cooling the heat-insulated carburizing furnace to 800-850 ℃, then carrying out heat insulation on the fastener for 15-30min, taking out the fastener from the carburizing furnace, and carrying out oil cooling to 60-90 ℃;
step four: heating the fastener in a vacuum furnace, raising the temperature in the vacuum furnace at 5-10 ℃/min, finally keeping the temperature in the vacuum furnace at 450-600 ℃, preserving the heat of the fastener for 2.5-3.5h, taking out the fastener when the temperature in the vacuum furnace is reduced to 450 ℃ at the speed of 10 ℃/min, and naturally cooling the fastener to be below 20 ℃;
step five: putting the fastener into a vacuum furnace for heating, raising the temperature in the vacuum furnace to 140-160 ℃ at the speed of 5-10 ℃/min, preserving the heat for 2h, and then taking out the fastener for naturally cooling to 80-90 ℃;
step six: and (3) placing the fastener cooled to 80-90 ℃ on a tapping machine for tapping again, then placing the fastener into a vacuum furnace for reheating to 140-. The tapping machine in the step adopts the designed thread depth of the fastener, and the step effectively impacts tapped internal threads, so that the wear resistance, fatigue resistance and corrosion resistance of the internal threads of the fastener can be greatly improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution 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 (6)
1. The heat treatment process of the fastener is characterized in that: comprises the following steps
The method comprises the following steps: cleaning the tapped fastener, putting the fastener into a vacuum furnace, raising the temperature in the vacuum furnace to 850-920 ℃, and continuously heating for 3 minutes after the temperature is raised to the preset temperature;
step two: transferring the heated fastener into a carburizing furnace, adding protective gas and a carburizing agent into the carburizing furnace, and performing carburizing treatment on the fastener, wherein the temperature in the carburizing furnace is controlled at 900-920 ℃, and the heat of the fastener is preserved for 2-4 h;
step three: cooling the carburizing furnace after heat preservation to 800-850 ℃, then preserving the heat of the fastener for 15-30min, taking out the fastener from the carburizing furnace, and cooling to 60-90 ℃ through oil cooling;
step four: heating the fastener in a vacuum furnace, keeping the temperature in the vacuum furnace at 450-;
step five: putting the fastener into a vacuum furnace for heating, raising the temperature in the vacuum furnace to 140-160 ℃ at the speed of 5-10 ℃/min, preserving the heat for 2h, and then taking out the fastener for naturally cooling to 80-90 ℃;
step six: and (4) placing the fastener on a tapping machine for tapping again, then placing the fastener into a vacuum furnace, heating to 140-160 ℃, preserving heat for 2h, and cooling to room temperature.
2. The heat treatment process for fasteners according to claim 1, characterized in that: and in the second step, the protection period is nitrogen, and the carburizing agent is butane.
3. The heat treatment process for fasteners according to claim 1, characterized in that: step two, an accelerant agent is also adopted, and the accelerant agent comprises Na2CO3Potassium ferrocyanide and wood chips.
4. The heat treatment process for fasteners according to claim 1, characterized in that: in the first step, the temperature in the vacuum furnace is increased at a rate of 20-25 ℃/min.
5. The heat treatment process for fasteners according to claim 1, characterized in that: in the fourth step, the temperature in the vacuum furnace is increased at a speed of 5-10 ℃/min.
6. The heat treatment process for fasteners according to claim 1, characterized in that: the depth of the primary tapping is 0.1mm less than that of the secondary tapping, and the depth of the secondary tapping is standard size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210359525.9A CN114672630A (en) | 2022-04-07 | 2022-04-07 | Heat treatment process of fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210359525.9A CN114672630A (en) | 2022-04-07 | 2022-04-07 | Heat treatment process of fastener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114672630A true CN114672630A (en) | 2022-06-28 |
Family
ID=82077733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210359525.9A Pending CN114672630A (en) | 2022-04-07 | 2022-04-07 | Heat treatment process of fastener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114672630A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359007A (en) * | 2019-07-16 | 2019-10-22 | 苏州新凌高强度紧固件有限公司 | A kind of heat treatment method of 20MnTiB fastener |
| CN110578109A (en) * | 2019-10-08 | 2019-12-17 | 江西洪都航空工业集团有限责任公司 | Vacuum carburizing heat treatment process for 18Cr2Ni4WA material workpiece |
| CN110712007A (en) * | 2019-10-23 | 2020-01-21 | 成都先进金属材料产业技术研究院有限公司 | Processing method for high-temperature fastening piece of steam turbine |
| CN111519007A (en) * | 2020-05-14 | 2020-08-11 | 贵阳白云中航紧固件有限公司 | Heat treatment process for fastener |
| CN111893258A (en) * | 2020-08-10 | 2020-11-06 | 阪上精密五金(太仓)有限公司 | High-strength manufacturing process for nut of screw fastener |
| CN112522661A (en) * | 2020-07-27 | 2021-03-19 | 滨中元川金属制品（昆山）有限公司 | Micro carburizing process for thin precision fastener |
-
2022
- 2022-04-07 CN CN202210359525.9A patent/CN114672630A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359007A (en) * | 2019-07-16 | 2019-10-22 | 苏州新凌高强度紧固件有限公司 | A kind of heat treatment method of 20MnTiB fastener |
| CN110578109A (en) * | 2019-10-08 | 2019-12-17 | 江西洪都航空工业集团有限责任公司 | Vacuum carburizing heat treatment process for 18Cr2Ni4WA material workpiece |
| CN110712007A (en) * | 2019-10-23 | 2020-01-21 | 成都先进金属材料产业技术研究院有限公司 | Processing method for high-temperature fastening piece of steam turbine |
| CN111519007A (en) * | 2020-05-14 | 2020-08-11 | 贵阳白云中航紧固件有限公司 | Heat treatment process for fastener |
| CN112522661A (en) * | 2020-07-27 | 2021-03-19 | 滨中元川金属制品（昆山）有限公司 | Micro carburizing process for thin precision fastener |
| CN111893258A (en) * | 2020-08-10 | 2020-11-06 | 阪上精密五金(太仓)有限公司 | High-strength manufacturing process for nut of screw fastener |
Non-Patent Citations (1)
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| 秦怀兵等: "《普速铁路轨道车司机》", 冶金工业出版社, pages: 42 * |
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