CN115319000A - Forming process of high-strength screw - Google Patents
Forming process of high-strength screw Download PDFInfo
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- CN115319000A CN115319000A CN202210934953.XA CN202210934953A CN115319000A CN 115319000 A CN115319000 A CN 115319000A CN 202210934953 A CN202210934953 A CN 202210934953A CN 115319000 A CN115319000 A CN 115319000A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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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
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- 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
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- 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
- C21D1/607—Molten salts
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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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- 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
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- 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
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- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/62—Treatment of iron or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention belongs to the technical field of fastener forming, and particularly relates to a forming process of a high-strength screw. The invention provides a molding process of a high-strength screw, which comprises the following steps of 1: cutting the metal bar into sections to obtain metal section bars; step 2: heating the pier head on the metal section; and step 3: the head end of the pier is integrated into a regular hexagonal prism-shaped screw head and chamfered and grooved to obtain a screw primary blank; and 4, step 4: carrying out heat treatment on the screw primary blank; and 5: rolling the screw thread at one end far away from the screw head; step 6: performing shot blasting treatment on the surface by using a shot blasting machine to obtain a screw fine blank; and 7: washing off attachments on the surface of the screw fine blank; and 8: and (4) blackening the clean screw fine blank to obtain the high-strength screw. The forming process of the high-strength screw provided by the invention has the advantages that the whole process steps are simple and feasible, the comprehensive cost is lower, and the prepared screw has excellent comprehensive properties of high strength, good toughness, strong corrosion resistance, high dimensional accuracy and the like.
Description
Technical Field
The invention belongs to the technical field of fastener forming, and particularly relates to a forming process of a high-strength screw.
Background
The screw is a common fastener and a basic part in modern manufacturing industry, and is widely applied to various fields of national economy, such as automobiles, wind power, machinery, electrical appliances, buildings and the like. In particular, in special fields such as chemical industry and nuclear industry, screws are often required to have very high strength and corrosion resistance, thereby ensuring reliability and safety in a long-term use process. However, screws that are high in strength and also have good corrosion resistance have been complicated to manufacture and expensive to produce.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a forming process of a high-strength screw.
The invention provides a molding process of a high-strength screw, which comprises the following steps:
step 1: cutting the metal bar into sections to obtain metal section materials;
and 2, step: heating one end of the metal section, and heading the heating end;
and step 3: one end of the pier head is integrated into a regular hexagonal prism-shaped screw head by adopting a machining method, the edge of the screw head is chamfered, and a cross groove is formed at the end part of the screw head to obtain a screw primary blank;
and 4, step 4: carrying out heat treatment on the screw primary blank;
and 5: after the heat treatment, performing thread rolling on one end far away from the screw head to form a thread;
and 6: after thread rolling, performing shot blasting treatment on the surface by using a shot blasting machine to obtain a screw fine blank;
and 7: washing off attachments on the surface of the screw fine blank;
and 8: and (4) blackening the clean screw fine blank to obtain the high-strength screw.
Further, in step 1 of the forming process of the high-strength screw, the metal bar comprises the following components by weight:
C：0.25-0.45％；
Si：0.15-0.35％；
Mn：0.24-0.45％；
Cr：0.12-0.30％；
Mo：0.12-0.18％；
Ni：0.08-0.12％；
P：≤0.030％；
S：≤0.030％；
fe: and (4) the balance.
Further, in step 2 of the forming process of the high-strength screw, an electromagnetic induction heating coil is used for heating one end of the metal section, and a punch is used for upsetting the heating end of the metal section.
Further, in step 3 of the forming process of the high-strength screw, a numerical control machine is used for shaping one end of the pier head.
Further, in step 4 of the molding process of the high-strength screw, the screw primary blank is heated to 950-970 ℃ and is kept warm for 8-10min, and then is quenched in molten salt containing 50wt% of sodium nitrite and 50wt% of potassium nitrate, wherein the quenching temperature is 380-430 ℃ and the quenching time is 2-10min.
Further, in step 4 of the forming process of the high-strength screw, after quenching is finished, artificial aging treatment is carried out for 25-40min at 150-160 ℃.
Further, in step 5 of the forming process of the high-strength screw, during thread rolling treatment, lubricating oil is sprayed on the surface of the screw blank subjected to heat treatment; the lubricating oil agent comprises the following components in parts by weight:
isooctyl oleate: 5 to 8 percent;
disodium lauryl sulfosuccinate monoester: 0.5-1.0%;
disodium cocomonoethanolamide sulfosuccinate: 0.2 to 0.3 percent;
sebacic acid: 0.5-1.5%;
1,2-benzisothiazol-3-one: 0.5-0.8%;
26# naphthenic oil: and (4) the balance.
Furthermore, in step 8 of the molding process of the high-strength screw, the blackening treatment is to place the clean screw fine blank in a mixed solution containing sodium hydroxide and sodium nitrite for 35-50min at the temperature of 135-140 ℃.
Further, in step 8 of the molding process of the high-strength screw, the concentration of sodium hydroxide in the mixed solution is 400-650g/L, and the concentration of sodium nitrite is 220-350g/L.
Has the advantages that: according to the forming process of the high-strength screw, the working procedures of quenching and thread rolling are adopted, so that the screw has high strength and high dimensional accuracy, steel with medium carbon content and compounded with alloy elements such as Si, mn, cr, mo, ni and the like is used as a raw material, the screw is endowed with high strength, toughness and corrosion resistance, the screw has good toughness and the surface hardness is obviously improved through a heat treatment process, the abrasion of equipment in the thread rolling treatment process is reduced through lubricating oil, the surface of the screw is passivated through blackening treatment, and the corrosion resistance is improved. Compared with the prior art, the forming process of the high-strength screw provided by the invention has the advantages that the whole process steps are simple and feasible, the comprehensive cost is lower, and the prepared screw has excellent comprehensive properties of high strength, good toughness, strong corrosion resistance, high dimensional precision and the like.
Detailed Description
The invention is further illustrated by the following specific examples, which are illustrative and intended to illustrate the problem and explain the invention, but not limiting.
Example 1
The forming process of the high-strength screw provided by the embodiment comprises the following steps of:
step 1: cutting the metal bar into sections to obtain metal section materials;
step 2: heating one end of the metal section, and heading the heating end;
and step 3: one end of the pier head is integrated into a regular hexagonal prism-shaped screw head by adopting a machining method, the edge of the screw head is chamfered, and a cross groove is formed at the end part of the screw head to obtain a screw primary blank;
and 4, step 4: carrying out heat treatment on the screw primary blank;
and 5: after the heat treatment, performing thread rolling on one end far away from the screw head to form a thread;
step 6: after thread rolling, performing shot blasting treatment on the surface by using a shot blasting machine to obtain a screw fine blank;
and 7: respectively adopting ethanol and clear water to clean the surface of the screw fine blank, and washing off impurities such as oil stains, particles and the like attached to the surface;
and 8: and (4) blackening the clean screw fine blank to obtain the high-strength screw.
In step 1 of this embodiment, the metal bar includes the following components by weight:
C：0.25％；
Si：0.15％；
Mn：0.24％；
Cr：0.12％；
Mo：0.12％；
Ni：0.08％；
P：≤0.030％；
S：≤0.030％；
fe: and the balance.
In step 2 of this embodiment, an electromagnetic induction heating coil is used to heat one end of the metal section, and a punch is used to perform heading on the heated end of the metal section.
In step 3 of this embodiment, adopt digit control machine tool to carry out the plastic to the one end of pier nose.
In step 4 of this example, the screw blank was heated to 950-c and held at the temperature for 8min, and then quenched in a molten salt containing 50wt% of sodium nitrite and 50wt% of potassium nitrate at 380 c for 2min. After quenching is finished, artificial aging treatment is carried out for 25min at 150 ℃.
In step 5 of this embodiment, during the thread rolling process, a lubricating oil is sprayed on the surface of the screw blank subjected to the heat treatment; the lubricating oil agent comprises the following components in parts by weight:
isooctyl oleate: 5 percent;
disodium lauryl sulfosuccinate monoester: 0.5 percent;
disodium cocomonoethanolamide sulfosuccinate: 0.2 percent;
sebacic acid: 0.5 percent;
1,2-benzisothiazol-3-one: 0.5 percent;
26# naphthenic oil: and (4) the balance.
In step 8 of this embodiment, the blackening treatment is performed by placing a clean screw blank in a mixed solution containing sodium hydroxide and sodium nitrite at a temperature of 135 ℃ for 35min. The concentration of sodium hydroxide in the mixed solution was 400g/L, and the concentration of sodium nitrite was 220g/L.
Example 2
The forming process of the high-strength screw provided by the embodiment comprises the following steps of:
step 1: cutting the metal bar into sections to obtain metal section materials;
step 2: heating one end of the metal section, and heading the heating end;
and 3, step 3: one end of the pier head is integrated into a regular hexagonal prism-shaped screw head by adopting a machining method, the edge of the screw head is chamfered, and a cross groove is formed at the end part of the screw head to obtain a screw primary blank;
and 4, step 4: carrying out heat treatment on the screw primary blank;
and 5: after the heat treatment, performing thread rolling on one end far away from the screw head to form a thread;
and 6: after thread rolling, performing shot blasting treatment on the surface by using a shot blasting machine to obtain a screw fine blank;
and 7: respectively adopting ethanol and clear water to clean the surface of the screw fine blank, and washing off impurities such as oil stains, particles and the like attached to the surface;
and 8: and (4) blackening the clean screw fine blank to obtain the high-strength screw.
In step 1 of this embodiment, the metal bar includes the following components by weight:
C：0.35％；
Si：0.24％；
Mn：0.35％；
Cr：0.21％；
Mo：0.15％；
Ni：0.11％；
P：≤0.030％；
S：≤0.030％；
fe: and (4) the balance.
In step 2 of this embodiment, an electromagnetic induction heating coil is used to heat one end of the metal section, and a punch is used to perform heading on the heated end of the metal section.
In step 3 of this embodiment, adopt digit control machine tool to carry out the plastic to the one end of pier nose.
In step 4 of this example, the screw blank was heated to 955 ℃ for 9min and then quenched in a molten salt containing 50wt% sodium nitrite and 50wt% potassium nitrate at 400 ℃ for 5min. After quenching is finished, artificial aging treatment is carried out for 30min at 153 ℃.
In step 5 of this embodiment, during the thread rolling process, a lubricating oil is sprayed on the surface of the screw blank subjected to the heat treatment; the lubricating oil agent comprises the following components in parts by weight:
isooctyl oleate: 6 percent;
disodium lauryl sulfosuccinate monoester: 0.7 percent;
disodium cocomonoethanolamide sulfosuccinate: 0.3 percent;
sebacic acid: 1.2 percent;
1,2-benzisothiazol-3-one: 0.6 percent;
26# naphthenic oil: and (4) the balance.
In step 8 of this embodiment, the blackening treatment is performed by placing a clean screw blank in a mixed solution containing sodium hydroxide and sodium nitrite at a temperature of 136 ℃ for 40min. The concentration of sodium hydroxide in the mixed solution is 500g/L, and the concentration of sodium nitrite is 250g/L.
Example 3
The forming process of the high-strength screw provided by the embodiment comprises the following steps of:
step 1: cutting the metal bar into sections to obtain metal section materials;
step 2: heating one end of the metal section, and heading the heating end;
and 3, step 3: one end of the pier head is integrated into a regular hexagonal prism-shaped screw head by adopting a machining method, the edge of the screw head is chamfered, and a cross groove is formed at the end part of the screw head to obtain a screw primary blank;
and 4, step 4: carrying out heat treatment on the screw primary blank;
and 5: after the heat treatment, performing thread rolling on one end far away from the screw head to form a thread;
step 6: after thread rolling, performing shot blasting treatment on the surface by using a shot blasting machine to obtain a screw fine blank;
and 7: respectively adopting ethanol and clear water to clean the surface of the screw fine blank, and washing off impurities such as oil stains, particles and the like attached to the surface;
and 8: and (4) blackening the clean screw fine blank to obtain the high-strength screw.
In step 1 of this embodiment, the metal bar includes the following components by weight:
C：0.35％；
Si：0.24％；
Mn：0.35％；
Cr：0.21％；
Mo：0.15％；
Ni：0.11％；
P：≤0.030％；
S：≤0.030％；
fe: and (4) the balance.
In step 2 of this embodiment, an electromagnetic induction heating coil is used to heat one end of the metal section, and a punch is used to perform heading on the heated end of the metal section.
In step 3 of this embodiment, adopt digit control machine tool to carry out the plastic to the one end of pier nose.
In step 4 of this example, the screw blank was heated to 965 ℃ and held for 9min, and then quenched in a molten salt containing 50wt% of sodium nitrite and 50wt% of potassium nitrate at 410 ℃ for 8min. After quenching is finished, artificial aging treatment is carried out for 35min at 155 ℃.
In step 5 of this embodiment, during thread rolling, a lubricating oil is sprayed on the surface of the screw blank subjected to heat treatment; the lubricating oil agent comprises the following components in parts by weight:
isooctyl oleate: 6 percent;
disodium lauryl sulfosuccinate monoester: 0.7 percent;
disodium cocomonoethanolamide sulfosuccinate: 0.3 percent;
sebacic acid: 1.2 percent;
1,2-benzisothiazol-3-one: 0.6 percent;
26# naphthenic oil: and (4) the balance.
In step 8 of this embodiment, the blackening treatment is performed by placing a clean screw blank in a mixed solution containing sodium hydroxide and sodium nitrite at a temperature of 138 ℃ for 45min. The concentration of sodium hydroxide in the mixed solution is 600g/L, and the concentration of sodium nitrite is 320g/L.
Example 4
The forming process of the high-strength screw provided by the embodiment comprises the following steps:
step 1: cutting the metal bar into sections to obtain metal section materials;
and 2, step: heating one end of the metal section, and heading the heating end;
and step 3: one end of the pier head is integrated into a regular hexagonal prism-shaped screw head by adopting a machining method, the edge of the screw head is chamfered, and a cross groove is formed at the end part of the screw head to obtain a screw primary blank;
and 4, step 4: carrying out heat treatment on the screw primary blank;
and 5: after the heat treatment, rolling threads at one end far away from the screw head to form threads;
step 6: after thread rolling, performing shot blasting treatment on the surface by using a shot blasting machine to obtain a screw fine blank;
and 7: respectively adopting ethanol and clear water to clean the surface of the screw fine blank, and washing off impurities such as oil stains, particles and the like attached to the surface;
and 8: and (4) blackening the clean screw fine blank to obtain the high-strength screw.
In step 1 of this embodiment, the metal bar includes the following components by weight:
C：0.45％；
Si：0.35％；
Mn：0.45％；
Cr：0.30％；
Mo：0.18％；
Ni：0.12％；
P：≤0.030％；
S：≤0.030％；
fe: and (4) the balance.
In step 2 of this embodiment, an electromagnetic induction heating coil is used to heat one end of the metal section, and a punch is used to perform heading on the heated end of the metal section.
In step 3 of this embodiment, adopt digit control machine tool to carry out the plastic to the one end of pier nose.
In step 4 of this example, the screw blank was heated to 970 ℃ and kept warm for 10min, and then quenched in a molten salt containing 50wt% of sodium nitrite and 50wt% of potassium nitrate at 430 ℃ for 10min. After quenching is finished, artificial aging treatment is carried out for 40min at 160 ℃.
In step 5 of this embodiment, during the thread rolling process, a lubricating oil is sprayed on the surface of the screw blank subjected to the heat treatment; the lubricating oil agent comprises the following components in parts by weight:
isooctyl oleate: 8 percent;
disodium lauryl sulfosuccinate: 1.0 percent;
disodium cocomonoethanolamide sulfosuccinate: 0.3 percent;
sebacic acid: 1.5 percent;
1,2-benzisothiazol-3-one: 0.8 percent;
26# naphthenic oil: and (4) the balance.
In step 8 of this embodiment, the blackening treatment is performed by placing a clean screw blank in a mixed solution containing sodium hydroxide and sodium nitrite at a temperature of 140 ℃ for 50min. The concentration of sodium hydroxide in the mixed solution is 650g/L, and the concentration of sodium nitrite is 350g/L.
Performance testing
The samples of the examples were subjected to tensile tests using a universal testing machine, the test method being referred to the national standard GB/T3098.6-2010. Further, the samples of the examples were subjected to a neutral salt spray corrosion test, and the samples were placed in a salt spray box for 168 hours under the conditions of the salt spray box according to the national standard GB/T10125-1997. The tensile test was performed on the sample after the salt spray corrosion test was completed using a universal tester, and the results are shown in table 1.
Table 1 results of performance testing
| Sample examples | Tensile strength (MPa) | Tensile Strength after salt spray test (MPa) |
| Example 1 | 1309 | 1306 |
| Example 2 | 1328 | 1329 |
| Example 3 | 1352 | 1350 |
| Example 4 | 1321 | 1317 |
The above embodiments are provided for illustrative purposes, so that those skilled in the art can understand the technical idea and features of the present invention and implement the invention, and the protection scope of the present invention is not limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A molding process of a high-strength screw is characterized in that: the method comprises the following steps:
step 1: cutting the metal bar into sections to obtain metal section materials;
step 2: heating one end of the metal section, and heading the heating end;
and step 3: one end of the pier head is integrated into a regular hexagonal prism-shaped screw head by adopting a machining method, the edge of the screw head is chamfered, and a cross groove is formed at the end part of the screw head to obtain a screw primary blank;
and 4, step 4: carrying out heat treatment on the screw primary blank;
and 5: after the heat treatment, performing thread rolling on one end far away from the screw head to form a thread;
and 6: after thread rolling, performing shot blasting treatment on the surface by using a shot blasting machine to obtain a screw fine blank;
and 7: washing off attachments on the surface of the screw fine blank;
and 8: and (4) blackening the clean screw fine blank to obtain the high-strength screw.
2. The process for forming a high-strength screw according to claim 1, wherein: in the step 1, the metal bar comprises the following components in parts by weight:
C：0.25-0.45%；
Si：0.15-0.35％；
Mn：0.24-0.45％；
Cr：0.12-0.30％；
Mo：0.12-0.18％；
Ni：0.08-0.12％；
P：≤0.030 ％；
S：≤0.030％；
fe: and (4) the balance.
3. The process for forming a high-strength screw according to claim 1, wherein: and 2, heating one end of the metal section by using an electromagnetic induction heating coil, and upsetting the heating end of the metal section by using a punch.
4. The process for forming a high-strength screw according to claim 1, wherein: and 3, shaping one end of the pier head by adopting a numerical control machine.
5. The process for forming a high-strength screw according to claim 2, wherein: in the step 4, the screw primary blank is heated to 950-970 ℃ and is kept warm for 8-10min, and then the screw primary blank is put into molten salt containing 50wt% of sodium nitrite and 50wt% of potassium nitrate for quenching, wherein the quenching temperature is 380-430 ℃ and the quenching time is 2-10min.
6. The process for forming a high-strength screw according to claim 5, wherein: in step 4, after quenching is finished, artificial aging treatment is carried out for 25-40min at 150-160 ℃.
7. The process for forming a high-strength screw according to claim 1, wherein: step 5, spraying lubricating oil on the surface of the screw primary blank subjected to heat treatment during thread rolling treatment; the lubricating oil agent comprises the following components in parts by weight:
isooctyl oleate: 5 to 8 percent;
disodium lauryl sulfosuccinate: 0.5-1.0%;
disodium cocomonoethanolamide sulfosuccinate: 0.2 to 0.3 percent;
sebacic acid: 0.5-1.5%;
1,2-benzisothiazol-3-one: 0.5-0.8%;
26# naphthenic oil: and (4) the balance.
8. The process for forming a high-strength screw according to claim 7, wherein: in the step 8, the blackening treatment is to place the clean screw fine blank in a mixed solution containing sodium hydroxide and sodium nitrite for 35-50min at the temperature of 135-140 ℃.
9. The process for forming a high-strength screw according to claim 8, wherein: in step 8, the concentration of sodium hydroxide in the mixed solution is 400-650g/L, and the concentration of sodium nitrite is 220-350g/L.
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