CN107414420A - A kind of processing technology of high-strength large hexagon head bolt used for steel structure - Google Patents
A kind of processing technology of high-strength large hexagon head bolt used for steel structure Download PDFInfo
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- CN107414420A CN107414420A CN201710599237.XA CN201710599237A CN107414420A CN 107414420 A CN107414420 A CN 107414420A CN 201710599237 A CN201710599237 A CN 201710599237A CN 107414420 A CN107414420 A CN 107414420A
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- Prior art keywords
- bolt
- processing technology
- furnace
- time
- soaking time
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- 238000012545 processing Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 15
- 239000010959 steel Substances 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000005242 forging Methods 0.000 claims abstract description 7
- 238000005496 tempering Methods 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 4
- 229910001339 C alloy Inorganic materials 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 125000003003 spiro group Chemical group 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012805 post-processing Methods 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of processing technology of disclosed high-strength large hexagon head bolt used for steel structure, including step stock, hot forging are begun to crop up, and soft annealing, surface treatment, thread forming, are quenched, tempering, Carburization Treatment and post processing.A kind of processing technology of high-strength large hexagon head bolt used for steel structure provided by the invention, technical process is simpler, and manufacturing cost is relatively low, and technical process continuity is good, and production efficiency is high, and bolt life is longer.
Description
Technical field
The present invention relates to a kind of production method of bolt, more particularly to a kind of high-strength large hexagon head bolt used for steel structure
Processing technology.
Background technology
High-strength large hexagon head bolt used for steel structure is the fastener commonly used in machinery industry, and current processing mode is general
It is molded using turning mode, its intensity is often difficult to ensure that, when tensile strength exceedes certain value, on the ground that breach is concentrated
Side such as bar and the transition position or thread root on head easily cause delayed fracture and fatigue fracture, and serious shadow is caused to construction quality
Ring, can be due to the generation that is inadequate and causing security incident of its bonding strength when serious, therefore need to traditional high-strength bolt
Production technology studied and improved, can efficiently be produced in enormous quantities on the premise of its quality is ensured, meet society
Can be to the widespread need of high-strength large hexagon head bolt used for steel structure.
The content of the invention
It is an object of the invention to provide a kind of processing technology of high-strength large hexagon head bolt used for steel structure, technical process
Relatively simple, manufacturing cost is relatively low, and technical process continuity is good, and production efficiency is high, and bolt life is longer.
The technical scheme is that：A kind of processing technology of high-strength large hexagon head bolt used for steel structure, is specifically included
Following steps：
A, stock up, from medium carbon alloy steel as bolt raw material, and according to blank under the big dolly of specification of bolt；
B, hot forging is begun to crop up：Bolt is begun to crop up with 900 DEG C -1000 DEG C of temperature in high frequency induction heater and carries out hot forging, high frequency
Faradic frequency is ten thousand hertz of 2-5, rear cooling；
C, soft annealing：Isothermal spheroidizing is carried out in clock hood type furnace, substantial amounts of carbon rich material matter, soft annealing are put into clock hood type furnace
Temperature：For 850 DEG C ± 10 DEG C, soaking time is 6-8 hours, after insulation furnace cooling come out of the stove to less than 250 DEG C, its hardness control
System is between HB100-120
D, it is surface-treated, phosphorating treatment, specially alkali cleaning → washing → acid is carried out to the spiro rod section of the bolt semi-finished product after annealing
Wash → wash → phosphatization → cleaning；
E, thread forming, screw thread is formed by screw-rolling machine in threaded shank；
F, quench, the bolt of shaping quenched in nitrate furnace, control hardening heat as 840 ~ 855 DEG C, the heating-up time is
6 ~ 8min, soaking time are 60 ~ 70min；
G, it is tempered, the bolt of shaping is tempered in nitrate furnace, control temperature as 520 ~ 570 DEG C, the heating-up time is
66 ~ 70min, soaking time are 95 ~ 100min；
H, Carburization Treatment, quenched in 600 ~ 610 DEG C of salt bath furnace inside holding 4h, during saline solution use concentration as 80g/
L potassium chloride, concentration are 190g/l sodium sulphate, and the sodium chloride that the potassium nitrate and concentration that concentration is 70g/l are 145g/l is with 1:
1:1:1 mixed solution；
I, post-process, oil stain is carried out to the bolt after step g processing, dries and silver-plated process, forms final finished.
Hardening heat control is at 850 DEG C, heating-up time 7min, soaking time 70min in the step e, with oil after quenching
Cooling, chilling temperature are less than 30 DEG C.
Temperature control is at 540 DEG C, heating-up time 70min, soaking time 98min, after tempering in the step f
It is water-cooled.
Beneficial effect：A kind of processing technology of disclosed high-strength large hexagon head bolt used for steel structure, passes through
Modifications and adaptations are done to existing process process, reduces the heating times of bolt, reduces energy resource consumption, having saved cost can
The intensity of bolt is improved, technical process is simpler, and manufacturing cost is relatively low, and technical process continuity is good, and production efficiency is high, the bolt longevity
Order longer.
Embodiment
Below in conjunction with specific embodiment, clear, complete description is carried out to technical scheme.
A kind of processing technology of disclosed high-strength large hexagon head bolt used for steel structure, specifically includes following step
Suddenly：
A, stock up, from medium carbon alloy steel as bolt raw material, and according to blank under the big dolly of specification of bolt；
B, hot forging is begun to crop up：Bolt is begun to crop up with 900 DEG C -1000 DEG C of temperature in high frequency induction heater and carries out hot forging, high frequency
Faradic frequency is ten thousand hertz of 2-5, rear cooling；
C, soft annealing：Isothermal spheroidizing is carried out in clock hood type furnace, substantial amounts of carbon rich material matter, soft annealing are put into clock hood type furnace
Temperature：For 850 DEG C ± 10 DEG C, soaking time is 6-8 hours, after insulation furnace cooling come out of the stove to less than 250 DEG C, its hardness control
System is between HB100-120
D, it is surface-treated, phosphorating treatment, specially alkali cleaning → washing → acid is carried out to the spiro rod section of the bolt semi-finished product after annealing
Wash → wash → phosphatization → cleaning；
E, thread forming, screw thread is formed by screw-rolling machine in threaded shank；
F, quench, the bolt of shaping quenched in nitrate furnace, control hardening heat as 840 ~ 855 DEG C, the heating-up time is
6 ~ 8min, soaking time are 60 ~ 70min；
G, it is tempered, the bolt of shaping is tempered in nitrate furnace, control temperature as 520 ~ 570 DEG C, the heating-up time is
66 ~ 70min, soaking time are 95 ~ 100min；
H, Carburization Treatment, quenched in 600 ~ 610 DEG C of salt bath furnace inside holding 4h, during saline solution use concentration as 80g/
L potassium chloride, concentration are 190g/l sodium sulphate, and the sodium chloride that the potassium nitrate and concentration that concentration is 70g/l are 145g/l is with 1:
1:1:1 mixed solution；
I, post-process, oil stain is carried out to the bolt after step g processing, dries and silver-plated process, forms final finished.
Hardening heat control is at 850 DEG C, heating-up time 7min, soaking time 70min in the step e, with oil after quenching
Cooling, chilling temperature are less than 30 DEG C.
Temperature control is at 540 DEG C, heating-up time 70min, soaking time 98min, after tempering in the step f
It is water-cooled.
One embodiment of the invention is described in detail above, but the content is only the invention
Preferred embodiment, it is impossible to be considered as the practical range for limiting the invention.It is all to be made according to the invention application range
Equivalent change with improve etc., belong within the patent covering scope of the invention.
Claims (3)
1. a kind of processing technology of high-strength large hexagon head bolt used for steel structure, it is characterised in that comprise the following steps：
A, stock up, from medium carbon alloy steel as bolt raw material, and according to blank under the big dolly of specification of bolt；
B, hot forging is begun to crop up：Bolt is begun to crop up with 900 DEG C -1000 DEG C of temperature in high frequency induction heater and carries out hot forging, high frequency
Faradic frequency is ten thousand hertz of 2-5, rear cooling；
C, soft annealing：Isothermal spheroidizing is carried out in clock hood type furnace, substantial amounts of carbon rich material matter, soft annealing are put into clock hood type furnace
Temperature：For 850 DEG C ± 10 DEG C, soaking time is 6-8 hours, after insulation furnace cooling come out of the stove to less than 250 DEG C, its hardness control
System is between HB100-120
D, it is surface-treated, phosphorating treatment, specially alkali cleaning → washing → acid is carried out to the spiro rod section of the bolt semi-finished product after annealing
Wash → wash → phosphatization → cleaning；
E, thread forming, screw thread is formed by screw-rolling machine in threaded shank；
F, quench, the bolt of shaping quenched in nitrate furnace, control hardening heat as 840 ~ 855 DEG C, the heating-up time is
6 ~ 8min, soaking time are 60 ~ 70min；
G, it is tempered, the bolt of shaping is tempered in nitrate furnace, control temperature as 520 ~ 570 DEG C, the heating-up time is
66 ~ 70min, soaking time are 95 ~ 100min；
H, Carburization Treatment, quenched in 600 ~ 610 DEG C of salt bath furnace inside holding 4h, during saline solution use concentration as 80g/
L potassium chloride, concentration are 190g/l sodium sulphate, and the sodium chloride that the potassium nitrate and concentration that concentration is 70g/l are 145g/l is with 1:
1:1:1 mixed solution；
I, post-process, oil stain is carried out to the bolt after step g processing, dries and silver-plated process, forms final finished.
2. high-strength bolt processing technology according to claim 1, it is characterised in that：Hardening heat control in the step f
System is at 850 DEG C, heating-up time 7min, soaking time 70min, and after quenching with oil cooling but, chilling temperature is less than 30 DEG C.
3. high-strength bolt processing technology according to claim 1, it is characterised in that：Temperature control in the step g
System heating-up time 70min, soaking time 98min, is water-cooled at 540 DEG C after tempering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710599237.XA CN107414420A (en) | 2017-07-21 | 2017-07-21 | A kind of processing technology of high-strength large hexagon head bolt used for steel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710599237.XA CN107414420A (en) | 2017-07-21 | 2017-07-21 | A kind of processing technology of high-strength large hexagon head bolt used for steel structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107414420A true CN107414420A (en) | 2017-12-01 |
Family
ID=60430084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710599237.XA Pending CN107414420A (en) | 2017-07-21 | 2017-07-21 | A kind of processing technology of high-strength large hexagon head bolt used for steel structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107414420A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109909690A (en) * | 2019-04-04 | 2019-06-21 | 浙江力友汽车科技有限公司 | A kind of processing technology of gearbox bolt |
| CN113500159A (en) * | 2021-07-07 | 2021-10-15 | 安徽长江紧固件有限责任公司 | Warm-heading composite forming process for high-strength fastener |
| CN113843584A (en) * | 2021-09-01 | 2021-12-28 | 苏州施必牢精密紧固件有限公司 | Processing method of fastener not easy to brittle fracture in low-temperature environment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101549449A (en) * | 2008-03-31 | 2009-10-07 | 江都狮鹤高强度螺栓有限公司 | Processing technology of high-strength large hexagon head bolt for steel structure |
| CN101934466A (en) * | 2009-06-30 | 2011-01-05 | 江都狮鹤高强度螺栓有限公司 | Technology for processing high strength large hexagon-headed bolt used for steel structure |
| CN103643018A (en) * | 2013-11-26 | 2014-03-19 | 常熟市福熙机械零部件制造有限公司 | Thermal processing technology for bolts |
| CN105269247A (en) * | 2014-07-14 | 2016-01-27 | 丁春燕 | Processing technology for big high-strength hexagon bolt used for steel structure |
-
2017
- 2017-07-21 CN CN201710599237.XA patent/CN107414420A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101549449A (en) * | 2008-03-31 | 2009-10-07 | 江都狮鹤高强度螺栓有限公司 | Processing technology of high-strength large hexagon head bolt for steel structure |
| CN101934466A (en) * | 2009-06-30 | 2011-01-05 | 江都狮鹤高强度螺栓有限公司 | Technology for processing high strength large hexagon-headed bolt used for steel structure |
| CN103643018A (en) * | 2013-11-26 | 2014-03-19 | 常熟市福熙机械零部件制造有限公司 | Thermal processing technology for bolts |
| CN105269247A (en) * | 2014-07-14 | 2016-01-27 | 丁春燕 | Processing technology for big high-strength hexagon bolt used for steel structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109909690A (en) * | 2019-04-04 | 2019-06-21 | 浙江力友汽车科技有限公司 | A kind of processing technology of gearbox bolt |
| CN113500159A (en) * | 2021-07-07 | 2021-10-15 | 安徽长江紧固件有限责任公司 | Warm-heading composite forming process for high-strength fastener |
| CN113843584A (en) * | 2021-09-01 | 2021-12-28 | 苏州施必牢精密紧固件有限公司 | Processing method of fastener not easy to brittle fracture in low-temperature environment |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171201 |