CN108526826A - A kind of processing technology of high-strength bolt - Google Patents
A kind of processing technology of high-strength bolt Download PDFInfo
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- CN108526826A CN108526826A CN201810405025.8A CN201810405025A CN108526826A CN 108526826 A CN108526826 A CN 108526826A CN 201810405025 A CN201810405025 A CN 201810405025A CN 108526826 A CN108526826 A CN 108526826A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
-
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Abstract
The present invention relates to technical field of bolt processing, more particularly to a kind of processing technology of high-strength bolt, spheroidising, cold-heading molding, derusting, cutting, threading, quenching treatment, temper, antirust treatment are carried out as raw material using special alloy steel, compared with prior art, the application carries out spheroidising as raw material using special alloy steel and is processed with cold-heading, it arranges in pairs or groups again special thermal treatment production process, produces with higher intensity, more high tenacity and have good antifatigue and high temperature resistant performance bolt.
Description
Technical field
The present invention relates to technical field of bolt processing, and in particular to a kind of processing technology of high-strength bolt.
Background technology
With the development of each production industry such as automobile, machinery, building, light industry, as the high performance of automobile and lightweight,
The high stratification of building structure and the overlength etc. of bridge, to being proposed as the bolt design stress of connection parts and lightweight
Higher requirement.
And bolt on the market, tensile strength maximum are merely able to reach 1200MPa at present, yield strength maximum can only reach
To 1080MPa, need the application scenarios that bolt has tensile strength larger, existing bolt that can then be easy to generate some
Metal fatigue, also, service life is shorter, it is easy to generate security risk.
Invention content
It is an object of the invention to be directed to deficiency in the prior art, and a kind of processing technology of high-strength bolt is provided,
It can be solved the problems, such as using the processing unit (plant) ineffective.
The purpose of the present invention is achieved through the following technical solutions：A kind of processing technology of high-strength bolt, including following step
Suddenly, step A：Feedstock processing and molding use special alloy steel to carry out spheroidising and cold-heading molding as raw material, then first
Raw material after cold-heading molding removes the oxide layer on raw material surface using rust remover of peeling off, and last raw material is laser-cut into screw rod, and
And the outer surface of screw rod carries out threading and forms bolt；Step B：Quenching treatment first launches to level-one quenching and removes 860 ± 10 DEG C of constant temperature
Environment in quenched, 100 ± 10 minutes cool times, be then sequentially thrown to successively two level quenching area, three-level quenching area,
Level Four quenching area, Pyatyi quenching area, six grades of quenching areas carry out constant temperature quenching, and the two level quenching area, three-level quenching area, level Four are quenched
The hardening heat of flame range, Pyatyi quenching area and six grades of quenching areas is 890 ± 10 DEG C, and the cool time is 100 ± 10 minutes；Step
Rapid C：Temper, quenched bolt, which is quickly cooled down, is thrown to tempering furnace progress temper, and tempering furnace is disposed with one
Grade refined zone, second annealing area, three-level refined zone, level Four refined zone and Pyatyi refined zone, the level-one refined zone, second annealing
Area, three-level refined zone, level Four refined zone and Pyatyi refined zone hardening heat be 135 ± 10 DEG C, the cool time is 135 ±
10 minutes；Step D：Bolt after temper is placed into anti-rust groove and carries out antirust treatment, so that the outer surface of bolt is formed
Antirust coat.
Wherein, the chemical composition of the raw material in step A：C：0.38%-0.45%；Mn：0.15%-0.25%；Cr：
0.8%-1.2%；Mo：2.1%-2.8%；Si：0.05%-0.15%；S ＜ 0.001%；P ＜ 0.004%；V：0.6%-
0.9%；Nb：0.01-0.05%, other are Fe and inevitable impurity.
Wherein, the material composition of the antirust coat in step D and its mass fraction are：Six 35 parts of phosphates, acrylamide 30
Part, 18 parts of glutamic acid, 14 parts of nano silicon dioxide, 10 parts of coalescents.
Wherein, the thickness of the antirust coat in step D is 0.6 μm.
Beneficial effects of the present invention：The processing technology of the high-strength bolt of the application, compared with prior art, the application adopts
It uses special alloy steel to carry out spheroidising as raw material to process with cold-heading, then special thermal treatment production process of arranging in pairs or groups, produce
With higher intensity, more high tenacity and has good antifatigue and high temperature resistant performance bolt.
Specific implementation mode
The invention will be further described with the following Examples.
Embodiment 1.
A kind of one of the specific implementation mode of processing technology of high-strength bolt of the present invention, processing technology includes following step
Suddenly, step A：Feedstock processing and molding use special alloy steel to carry out spheroidising and cold-heading molding as raw material, then first
Raw material after cold-heading molding removes the oxide layer on raw material surface using rust remover of peeling off, and last raw material is laser-cut into screw rod, and
And the outer surface of screw rod carries out threading and forms bolt；Step B：Quenching treatment first launches to level-one quenching and removes 860 ± 10 DEG C of constant temperature
Environment in quenched, 100 ± 10 minutes cool times, be then sequentially thrown to successively two level quenching area, three-level quenching area,
Level Four quenching area, Pyatyi quenching area, six grades of quenching areas carry out constant temperature quenching, two level quenching area, three-level quenching area, level Four quenching
The hardening heat in area, Pyatyi quenching area and six grades of quenching areas is 890 ± 10 DEG C, and the cool time is 100 ± 10 minutes；Step
C：Temper, quenched bolt, which is quickly cooled down, is thrown to tempering furnace progress temper, and tempering furnace is disposed with level-one
Refined zone, second annealing area, three-level refined zone, level Four refined zone and Pyatyi refined zone, level-one refined zone, second annealing area, three
The hardening heat of grade refined zone, level Four refined zone and Pyatyi refined zone is 135 ± 10 DEG C, and the cool time is 135 ± 10 points
Clock；Step D：Bolt after temper is placed into anti-rust groove and carries out antirust treatment, so that the outer surface of bolt forms antirust
Layer.
Compared with prior art, the application carries out spheroidising and cold-heading processing using special alloy steel as raw material, then
It arranges in pairs or groups special thermal treatment production process, produces with higher intensity, more high tenacity and have good antifatigue and resistance to height
The bolt of warm performance.
In the present embodiment, the chemical composition of the raw material in step A：C：0.38%；Mn：0.15%；Cr：0.8%；Mo：
2.1%；Si：0.05%；S ＜ 0.001%；P ＜ 0.004%；V：0.6%；Nb：0.01, other for Fe and inevitably it is miscellaneous
Matter reduces the contents of harmful elements such as P, S and carries high Mo content, mitigates cyrystal boundary segregation, strengthens crystal boundary, utilizes the secondary hard of Mo, V
Change carbide to improve steel belt roof bolt temperature and intensity, controls carbide state and distribution, promote the delayed fracture resistance of product
Energy.
In order to improve the antirust ability of bolt and prolong the service life, the material composition and its mass fraction of antirust coat
For：Six 35 parts of phosphates, 30 parts of acrylamide, 18 parts of glutamic acid, 14 parts of nano silicon dioxide, 10 parts of coalescents, wherein anti-
The thickness of rusty scale is 0.6 μm.
The bolt of the present embodiment passes through special heat-treatment processing process, and product is made to have superior fatigue behaviour, this
Product tests certification through inspection center, has passed through 500,000 testing fatigues, the still unbroken excellent anti-fatigue property of this product, production
Product tensile strength is up to 1400MPa or more, hardness：HRC44-50, strength grade：14.9, accuracy of thread reaches 5g6g, moreover it is possible to real
Existing 9% or more elongation.Case hardness by improving product promotes product to mitigate the abrasion of screw thread, supporting surface
Wearability increases case hardness, can improve the surface deterioration caused by Reusability, more recycle advantage, and high axis
Power can make closely sealed between supporting surface and object, anti-leakage effect.
Embodiment 2.
The two of the specific implementation mode of the processing technology of a kind of high-strength bolt of the present invention, the major technique of the present embodiment
Scheme is same as Example 1, and unaccounted feature is no longer gone to live in the household of one's in-laws on getting married herein using the explanation in embodiment 1 in the present embodiment
It states.The present embodiment and embodiment 1 difference lies in：The chemical composition of raw material in step A：C：0.45%；Mn：0.25%；Cr：
1.2%；Mo：2.8%；Si：0.05%；S ＜ 0.001%；P ＜ 0.004%；V：0.9%；Nb：0.01%, other are for Fe and not
Evitable impurity reduces content and the raising of the harmful elements such as P, S compared with Example 1 in the material composition of the present embodiment
Mo contents mitigate cyrystal boundary segregation, strengthen crystal boundary, and steel belt roof bolt temperature and strong is improved using the post-curing carbide of Mo, V
Degree controls carbide state and distribution, promotes the resistance for delayed fracture of product.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of range is protected, although being explained in detail to the present invention with reference to preferred embodiment, those skilled in the art answer
Work as understanding, technical scheme of the present invention can be modified or replaced equivalently, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (4)
1. a kind of processing technology of high-strength bolt, it is characterised in that：Include the following steps,
Step A：Feedstock processing and molding use special alloy steel to carry out spheroidising and cold-heading molding as raw material, so first
The raw material after cold-heading molding removes the oxide layer on raw material surface using rust remover of peeling off afterwards, and last raw material is laser-cut into screw rod,
And the outer surface of screw rod carries out threading and forms bolt；
Step B：Quenching treatment is first launched and is quenched in the environment for removing 860 ± 10 DEG C of constant temperature to level-one quenching, the cool time
100 ± 10 minutes, it is then sequentially thrown to two level quenching area, three-level quenching area, level Four quenching area, Pyatyi quenching area, six successively
Grade quenching area carries out constant temperature quenching, and the two level quenching area, three-level quenching area, level Four quenching area, Pyatyi quenching area and six grades are quenched
The hardening heat of flame range is 890 ± 10 DEG C, and the cool time is 100 ± 10 minutes；
Step C：Temper, quenched bolt, which is quickly cooled down, is thrown to tempering furnace progress temper, and tempering furnace is set successively
It is equipped with level-one refined zone, second annealing area, three-level refined zone, level Four refined zone and Pyatyi refined zone, the level-one refined zone, two
Grade refined zone, three-level refined zone, level Four refined zone and Pyatyi refined zone hardening heat be 135 ± 10 DEG C, the cool time is equal
It is 135 ± 10 minutes；
Step D：Bolt after temper is placed into anti-rust groove and carries out antirust treatment, so that the outer surface of bolt forms antirust
Layer.
2. the processing technology of high-strength bolt according to claim 1, it is characterised in that：The chemistry of raw material in step A
Ingredient：C：0.38%-0.45%；Mn：0.15%-0.25%；Cr：0.8%-1.2%；Mo：2.1%-2.8%；Si：
0.05%-0.15%；S ＜ 0.001%；P ＜ 0.004%；V：0.6%-0.9%；Nb：0.01-0.05%, other are for Fe and not
Evitable impurity.
3. the processing technology of high-strength bolt according to claim 1, it is characterised in that：Antirust coat in the step D
Material composition and its mass fraction be：Six 35 parts of phosphates, 30 parts of acrylamide, 18 parts of glutamic acid, nano silicon dioxide 14
Part, 10 parts of coalescents.
4. the processing technology of high-strength bolt according to claim 1, it is characterised in that：Antirust coat in the step D
Thickness be 0.6 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810405025.8A CN108526826A (en) | 2018-04-28 | 2018-04-28 | A kind of processing technology of high-strength bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810405025.8A CN108526826A (en) | 2018-04-28 | 2018-04-28 | A kind of processing technology of high-strength bolt |
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| Publication Number | Publication Date |
|---|---|
| CN108526826A true CN108526826A (en) | 2018-09-14 |
Family
ID=63476035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810405025.8A Pending CN108526826A (en) | 2018-04-28 | 2018-04-28 | A kind of processing technology of high-strength bolt |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109909685A (en) * | 2019-01-24 | 2019-06-21 | 上海窗固紧固件制造有限公司 | A kind of manufacturing method of elbow screw |
| CN111408901A (en) * | 2020-03-26 | 2020-07-14 | 鹏驰五金制品（昆山）有限公司 | Trimming-free production process for automobile hub bolt |
| CN111809032A (en) * | 2020-07-21 | 2020-10-23 | 金华市国鼎五金制品有限公司 | Preparation method of 14-grade ultrahigh-strength nut |
| CN112122206A (en) * | 2020-09-03 | 2020-12-25 | 浙江力友汽车科技有限公司 | High-strength bolt cold heading equipment and cold heading process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109909685A (en) * | 2019-01-24 | 2019-06-21 | 上海窗固紧固件制造有限公司 | A kind of manufacturing method of elbow screw |
| CN111408901A (en) * | 2020-03-26 | 2020-07-14 | 鹏驰五金制品（昆山）有限公司 | Trimming-free production process for automobile hub bolt |
| CN111809032A (en) * | 2020-07-21 | 2020-10-23 | 金华市国鼎五金制品有限公司 | Preparation method of 14-grade ultrahigh-strength nut |
| CN112122206A (en) * | 2020-09-03 | 2020-12-25 | 浙江力友汽车科技有限公司 | High-strength bolt cold heading equipment and cold heading process |
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Application publication date: 20180914 |