CN114227171A - Production method for efficiently producing high-strength bolt - Google Patents
Production method for efficiently producing high-strength bolt Download PDFInfo
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- CN114227171A CN114227171A CN202111606143.3A CN202111606143A CN114227171A CN 114227171 A CN114227171 A CN 114227171A CN 202111606143 A CN202111606143 A CN 202111606143A CN 114227171 A CN114227171 A CN 114227171A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005406 washing Methods 0.000 claims abstract description 43
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000002161 passivation Methods 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 238000010791 quenching Methods 0.000 claims abstract description 10
- 230000000171 quenching effect Effects 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims abstract description 9
- 238000000137 annealing Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000003754 machining Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000000243 solution Substances 0.000 claims description 22
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 238000005554 pickling Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000004140 cleaning Methods 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a production method for efficiently producing a high-strength bolt, which belongs to the technical field of bolts and comprises the following steps: firstly, rough grinding is carried out on a bolt rough blank, then acid washing is carried out, drying and airing are carried out, secondly, quenching is carried out on the bolt rough blank, isothermal annealing is carried out on the bolt rough blank, thirdly, parameters of a thread rolling machine are adjusted, thread machining is carried out on the heated bolt rough blank, fourthly, burr cleaning is carried out on threads generated by the bolt rough blank, then proper grinding and polishing are carried out, and fifthly, passivation treatment and phosphorization treatment are carried out on the bolt rough blank. The stable oxide film is cleaned on the bolt rough blank by using acid washing, the thread produced by the thread rolling machine is ensured, the structural strength of the thread is improved, and the outer wall of the bolt is stabilized by using passivation and phosphorization, so that the corrosion resistance and the abrasion resistance are ensured.
Description
Technical Field
The invention relates to the technical field of bolts, in particular to a production method for efficiently producing a high-strength bolt.
Background
A cylindrical threaded fastener for a bolt, a mechanical part and a matched nut is a fastener consisting of a head part and a screw (a cylinder with an external thread) and needs to be matched with the nut to be used for fastening and connecting two parts with through holes.
At present, quenching and annealing are often adopted for strengthening a bolt rough blank, but in the actual production process, stable strengthening is not carried out on threads generated by a thread rolling machine, so that the actual strength does not reach the standard in the subsequent use process, the problem of thread slipping is caused, a large amount of corrosion is generated in the subsequent use process, and the wear-resistant effect is also reduced.
Disclosure of Invention
The invention aims to provide a production method for efficiently producing a high-strength bolt. According to the production method for efficiently producing the high-strength bolt, the stable oxidation film of the bolt rough blank is cleaned by using acid washing, the thread produced by the thread rolling machine is ensured, the structural strength of the thread is improved, and the outer wall of the bolt is stabilized by using passivation and phosphorization, so that the corrosion resistance and the abrasion resistance are ensured.
In order to achieve the above effects, the present invention provides the following technical solutions: the production method for efficiently producing the high-strength bolt comprises the following steps:
firstly, roughly polishing a bolt rough blank, then carrying out acid cleaning, drying and airing.
And step two, quenching and isothermal annealing the bolt rough blank, and pickling the bolt rough blank.
And step three, adjusting parameters of the thread rolling machine, and performing thread machining on the heated bolt rough blank.
And step four, deburring the threads generated by the bolt rough blank, and then carrying out proper grinding and polishing.
And step five, carrying out passivation treatment and phosphating treatment on the bolt rough blank.
Further, according to the operation steps in the first step, the bolt rough blank is cast, demoulded and cooled by adopting high-quality molten iron.
Further, according to the operation steps in the first step, the pickling solution used for pickling comprises 300mL/L hydrochloric acid, 60mL/L phosphoric acid, 120mL/L hydrogen peroxide, 80mL/L stabilizer and 2mL/L surfactant.
Further, according to the operation steps in the second step, the bolt rough blank is heated and then subjected to thread rolling treatment, wherein isothermal heating is adopted for heating at 10 ℃ every 1 minute, and thread rolling treatment is performed after heating for 6 minutes.
Further, according to the operation steps in the second step, cooling water cooling soaking can be carried out on the bolt rough blank after the thread rolling treatment.
Further, according to the operation steps in the third step, the burrs are cleaned, the burrs are ground aiming at the edges of the threads, and the thread depth of the bolt rough blank is unchanged.
Further, according to the operation steps in the fourth step, the polishing is performed on the thread of the bolt rough blank, and the diameter and thickness error of the thread cannot be 0.1 mm.
Further, according to the operation steps in the fifth step, the passivation treatment is performed by salt bath (10 minutes), water quenching (2.5 minutes), sulfuric acid washing (2 minutes), cold water washing (2 minutes), alkaline permanganate bath (10 minutes), cold water washing (2 minutes), sulfuric acid washing (1 minute), cold water washing (1 minute), nitric acid washing (1.5 minutes), cold water washing (1 minute), hot water washing (1 minute) and air drying in this order.
Further, according to the operation steps in the fifth step, the phosphating solution used for phosphating comprises an acidic dilute aqueous solution consisting of Fe (H2PO4)2, Mn (H2PO4)2 and Zn (H2PO4)2, the pH value is 1-3, and the relative density of the solution is 1.05-1.10.
Further, according to the operation steps in the fifth step, the bolt rough blank is subjected to phosphating treatment at the temperature of 80-98 ℃ for 10-20 minutes, the thickness of the formed phosphating film reaches 10-30g/m2, and the ratio of the free acidity to the total acidity of the solution is 1 (7-8).
The invention provides a production method for efficiently producing a high-strength bolt, which has the following beneficial effects: according to the production method for efficiently producing the high-strength bolt, the stable oxide film is cleaned on the bolt rough blank by using acid washing, the thread produced by the thread rolling machine is ensured, the structural strength of the thread is improved, and the outer wall of the bolt is stabilized by using passivation and phosphorization, so that the corrosion resistance and the abrasion resistance are ensured.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The invention provides a technical scheme that: referring to fig. 1, the method for efficiently producing a high-strength bolt includes the following steps:
firstly, roughly polishing a bolt rough blank, then carrying out acid cleaning, drying and airing.
And step two, quenching and isothermal annealing the bolt rough blank, and pickling the bolt rough blank.
And step three, adjusting parameters of the thread rolling machine, and performing thread machining on the heated bolt rough blank.
And step four, deburring the threads generated by the bolt rough blank, and then carrying out proper grinding and polishing.
And step five, carrying out passivation treatment and phosphating treatment on the bolt rough blank.
Specifically, according to the operation steps in the step one, the bolt rough blank is cast, demoulded and cooled by adopting high-quality molten iron.
Specifically, according to the operation steps in the first step, the pickling solution used for pickling comprises 300mL/L of hydrochloric acid, 60mL/L of phosphoric acid, 120mL/L of hydrogen peroxide, 80mL/L of stabilizer and 2mL/L of surfactant.
Specifically, according to the operation steps in the second step, the bolt rough blank is heated and then subjected to thread rolling treatment, wherein isothermal heating is adopted for heating at 10 ℃ every 1 minute, and thread rolling treatment is performed after heating for 6 minutes.
Specifically, according to the operation steps in the second step, cooling water cooling soaking can be carried out on the bolt rough blank after the thread rolling treatment.
Specifically, according to the operation steps in the third step, burrs are cleaned, burrs are ground aiming at the edges of the threads, and the thread depth of the rough blank of the bolt is unchanged.
Specifically, according to the operation steps in the fourth step, the threads of the bolt rough blank are polished, and the diameter and thickness errors cannot be 0.1 mm.
Specifically, according to the operation steps in the fifth step, the passivation treatment is performed by salt bath (10 minutes), water quenching (2.5 minutes), sulfuric acid washing (2 minutes), cold water washing (2 minutes), alkaline permanganate bath (10 minutes), cold water washing (2 minutes), sulfuric acid washing (1 minute), cold water washing (1 minute), nitric acid washing (1.5 minutes), cold water washing (1 minute), hot water washing (1 minute) and air drying in this order.
Specifically, according to the operation steps in the fifth step, the phosphating solution used for phosphating comprises an acidic dilute aqueous solution consisting of Fe (H2PO4)2, Mn (H2PO4)2 and Zn (H2PO4)2, the pH value is 1-3, and the relative density of the solution is 1.05-1.10.
Specifically, according to the operation steps in the fifth step, the bolt rough blank is subjected to phosphating treatment at the temperature of 80-98 ℃ for 10-20 minutes, the thickness of the formed phosphating film reaches 10-30g/m2, and the ratio of the free acidity to the total acidity of the solution is 1 (7-8).
The method of the examples was performed for detection analysis and compared to the prior art to yield the following data:
| strength of the whole structure | Wear resistance | Anti-rust performance | |
| Examples | Is higher than | Is higher than | Is higher than |
| Prior Art | Is lower than | Is lower than | Is lower than |
According to the data in the table, when the embodiment is implemented, the production method for efficiently producing the high-strength bolt, which cleans the stable oxidation film of the bolt rough blank by using acid washing, ensures the thread produced by the thread rolling machine, improves the structural strength of the thread, and ensures the corrosion resistance and the abrasion resistance by using passivation and phosphorization to stabilize the outer wall of the bolt.
The invention provides a production method for efficiently producing a high-strength bolt, which comprises the following steps: firstly, rough grinding is carried out on a bolt rough blank, then acid washing is carried out, drying and airing are carried out, the bolt rough blank is cast, demoulded and cooled by adopting high-quality molten iron, the acid washing solution adopted by the acid washing comprises 300mL/L of hydrochloric acid, 60mL/L of phosphoric acid, 120mL/L of hydrogen peroxide, 80mL/L of stabilizing agent and 2mL/L of surfactant, and the method for removing oxide skin and rusty objects on the surface of steel by utilizing acid solution is called acid washing. Is a method for cleaning metal surface, and the steel parts are usually acid-washed in 10% -20% (volume) sulfuric acid solution at 40 ℃. When the iron content in the solution exceeds 80g/L and the ferrous sulfate exceeds 215g/L, the pickling solution should be replaced. At normal temperature, 20-80% (volume) of hydrochloric acid solution is used for pickling steel, and the over-corrosion and hydrogen embrittlement phenomena are not easy to occur. Since the acid has a great corrosive effect on metals, a corrosion inhibitor needs to be added. After cleaning, the metal surface is silvery white, and the surface is passivated, so that the corrosion resistance of the stainless steel is improved. Adopting a sulfuric acid aqueous solution with the concentration of 5-20%, quenching the bolt rough blank, carrying out isothermal annealing, carrying out acid pickling on the bolt rough blank, carrying out thread rolling treatment after the bolt rough blank needs to be heated, wherein the heating adopts isothermal heating and the heating is carried out at 10 ℃ every 1 minute, the thread rolling treatment is carried out after the heating is carried out for 6 minutes, the bolt rough blank after the thread rolling treatment can be cooled and soaked in water, step three, adjusting the parameters of a thread rolling machine, carrying out thread processing and burr cleaning on the heated bolt rough blank, carrying out burr grinding aiming at the edge of the thread, keeping the thread depth of the bolt rough blank unchanged, step four, carrying out burr cleaning on the thread generated by the bolt rough blank, then carrying out proper grinding and polishing, carrying out passivation treatment and phosphating treatment on the bolt rough blank aiming at the thread of the bolt blank, wherein the diameter thickness error of the bolt rough blank cannot generate 0.1 mm, and step five, passivation treatment, namely performing salt bath (10 minutes), water quenching (2.5 minutes), sulfuric acid washing (2 minutes), cold water washing (2 minutes), alkaline permanganate bath (10 minutes), cold water washing (2 minutes), sulfuric acid washing (1 minute), cold water washing (1 minute), nitric acid washing (1.5 minutes), cold water washing (1 minute), hot water washing (1 minute) and air drying in sequence, wherein phosphating solution used for phosphating treatment comprises acidic dilute aqueous solution consisting of Fe (H2PO4)2, Mn (H2PO4)2 and Zn (H2PO4)2, the pH value is 1-3, the relative density of the solution is 1.05-1.10, the bolt rough blank phosphating treatment adopts the treatment time of 80-98 ℃ for 10-20 minutes, the thickness of the formed phosphating film reaches 10-30g/m2, the ratio of the free acidity of the solution to the total acidity is 1 (7-8), and phosphating (phosphating) is a chemical and electrochemical reaction to form a chemical phosphate conversion film, the phosphate conversion film formed is called a phosphating film. The purpose of the phosphorization is mainly as follows: the base metal is protected, and the metal is prevented from being corroded to a certain extent; the primer is used for priming before painting, and the adhesive force and the corrosion resistance of a paint film layer are improved; the passivating agent can be repeatedly added and used after passivation treatment, so that the service life is longer, the cost is more economic, the passivation promotes an oxygen molecular structure passivation film formed on the surface of the metal, the film layer is compact and stable in performance, and the passivation agent has a self-repairing function in air, so that compared with the traditional method for coating anti-rust oil, the passivation film formed by passivation is more stable and corrosion-resistant, most of the charge effect in an oxide layer is directly or indirectly related to the thermal oxidation process, and the thermal oxidation process performed by dry oxygen, wet oxygen or water vapor has three continuous stages within the temperature range of 800-, firstly, oxygen in the ambient atmosphere enters the generated oxide layer, then the oxygen diffuses inwards through silicon dioxide, and when the oxygen reaches the Si02-Si interface, the oxygen reacts with silicon to form new silicon dioxide, so that the oxygen entering-diffusing-reacting process continuously occurs, the silicon close to the interface is continuously converted into the silicon dioxide, and the oxide layer grows towards the interior of the silicon wafer at a certain speed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The production method for efficiently producing the high-strength bolt is characterized by comprising the following steps of:
s1, firstly, roughly grinding the bolt rough blank, then carrying out acid washing, drying and airing;
s2, quenching the bolt rough blank, carrying out isothermal annealing, and carrying out acid washing on the bolt rough blank;
s3, adjusting parameters of the thread rolling machine, and performing thread machining on the heated bolt rough blank;
s4, deburring the threads generated by the bolt rough blank, and then carrying out proper grinding and polishing;
and S5, carrying out passivation treatment and phosphating treatment on the bolt rough blank.
2. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation step in the S1, the bolt rough blank is cast, demolded and cooled by adopting high-quality molten iron.
3. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation step in S1, the pickling solution used for pickling comprises 300mL/L hydrochloric acid, 60mL/L phosphoric acid, 120mL/L hydrogen peroxide, 80mL/L stabilizer and 2mL/L surfactant.
4. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation steps in the S2, the bolt rough blank is heated and then subjected to thread rolling treatment, wherein isothermal heating is adopted for heating at 10 ℃ every 1 minute, and thread rolling treatment is carried out after heating for 6 minutes.
5. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation step in the S3, cooling water cooling soaking can be carried out on the bolt rough blank after the thread rolling treatment.
6. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation step in the S4, the burrs are cleaned, the burrs are ground aiming at the edges of the threads, and the thread depth of the bolt rough blank is unchanged.
7. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation step in S4, the grinding and polishing are performed on the thread of the bolt rough blank, and the diameter thickness error of the thread cannot be 0.1 mm.
8. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation procedure in S5, the passivation treatment was performed by salt bath (10 minutes), water quenching (2.5 minutes), sulfuric acid washing (2 minutes), cold water washing (2 minutes), alkaline permanganate bath (10 minutes), cold water washing (2 minutes), sulfuric acid washing (1 minute), cold water washing (1 minute), nitric acid washing (1.5 minutes), cold water washing (1 minute), hot water washing (1 minute), and air drying in this order.
9. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation procedure in S5, the phosphating solution used for the phosphating treatment comprises an acidic dilute aqueous solution consisting of Fe (H2PO4)2, Mn (H2PO4)2 and Zn (H2PO4)2, the pH value is 1-3, and the relative density of the solution is 1.05-1.10.
10. The production method for efficiently producing a high-strength bolt according to claim 1, characterized by comprising the steps of: according to the operation steps in S5, the bolt rough blank phosphating treatment adopts the treatment time of 10-20 minutes at 80-98 ℃, the thickness of the formed phosphating film reaches 10-30g/m2, and the ratio of the free acidity to the total acidity of the solution is 1 (7-8).
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