CN1209209C - Production process of high strength bolt with above 1300MPa - Google Patents
Production process of high strength bolt with above 1300MPa Download PDFInfo
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- CN1209209C CN1209209C CN 03113218 CN03113218A CN1209209C CN 1209209 C CN1209209 C CN 1209209C CN 03113218 CN03113218 CN 03113218 CN 03113218 A CN03113218 A CN 03113218A CN 1209209 C CN1209209 C CN 1209209C
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Abstract
The present invention relates to manufacturing technology for a high-strength bolt which is higher than 1300MPa grade. The manufacturing technology orderly comprises a material feeding work procedure, a workblank processing work procedure, an annealing work procedure, a cold heading formation work procedure, a rod part turning work procedure, a modified treatment work procedure, a grinding work procedure, a flaw detecting work procedure, a wire rolling work procedure, a composite strengthening work procedure composed of a round angle rolling and pressing work procedure and a shot blasting work procedure, a surface treating work procedure, and the flaw detecting work procedure, wherein the annealing work procedure before the cold heading formation work procedure uses one-step spheroidization annealing technology. The spheroidization annealing temperature is from 740 to 760 DEG C, and the operation of heat preservation is carried out for 5 to 8 hours. The material is removed from the furnace to be cooled by air when the furnace is cooled to be 500 DEG C, and the hardness is lower than HV 170 after the annealing operation. In the modified treatment work procedure, the quenching temperature is from 920 to 940 DEG C, the heat insulation is carried out for 20 to 30 minutes, oil cooling operation is carried out, the tempering temperature is from 590 to 615 DEG C, the heat insulation is carried out for 90 to 120 minutes, and water cooling operation is carried out. A working procedure of normalizing pretreatment is arranged after the rod part turning working procedure before the modified treatment work procedure. The normalizing temperature is from 920 to 940 DEG C, and after the heat insulation is carried out for 20 to 40 minutes, air cooling operation is carried out. The present invention optimizes the manufacturing technology of a high-strength bolt, and solves the problem of the delaying fracture and the fatigue fracture of the bolt under the high strength.
Description
Technical field
The present invention relates to a kind of manufacturing process of high-strength bolt, be in particular the manufacturing process of the above high-strength bolt of a kind of 1300MPa level.
Background technology
High-strength bolt is a most widely used securing member of mechanical industry, and domestic 40Cr and the 42CrMo of adopting usually at present produces high-strength bolt, and its maximum intensity rank is 1200MPa level (12.9 grades).High-strength bolt has very high notch sensitivity, when tensile strength surpasses about 1200MPa, it is very outstanding that delayed fracture just becomes, concentrate the transition position of position such as bar and head or thread root to produce delayed fracture and fatigue fracture at breach easily, domestic also do not have above high-strength bolt of 1300MPa level and corresponding manufacturing process at present, do not solve more that bolt produces the problem of delayed fracture and fatigue fracture under the high strength yet.This also is the reason that domestic high-strength bolt does not surpass the 1200MPa level.42CrMoVNb is the new steel grade that is specifically designed to the above high-strength bolt of 1300MPa level, need traditional high-strength bolt manufacturing process such as technical study optimizations such as heat treatment, surface peening, to realize the unification of bolt high strength and high resistance for delayed fracture and fatigue behaviour.
Technology contents
Purpose of the present invention is exactly the manufacturing process that a kind of 1300MPa grade high-strength bolt is provided for the above-mentioned defective that solves prior art.
Purpose of the present invention realizes by following technical solution:
The manufacturing process of the above high-strength bolt of a kind of 1300MPa level, it includes blanking operation, machining blanks operation, annealing operation, cold-heading molding operation, turning bar portion and bearing-surface operation, modifier treatment operation, grinding process, flaw detection operation, rolled thread operation, roll extrusion fillet operation, surface treatment procedure and flaw detection operation in regular turn, adopt an annealing process in described annealing operation, its spheroidizing temperature is 740 ℃～760 ℃, be incubated 5～8 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than vickers hardness hv 170; In described modifier treatment operation, hardening heat is 920 ℃～940 ℃, is incubated 20～30 minutes, oil cooling, and 590 ℃～615 ℃ of temperatures are incubated 90～120 minutes, water-cooled.
Purpose of the present invention further realizes by following technology solution:
The manufacturing process of the above high-strength bolt of aforesaid a kind of 1300MPa level wherein saidly is provided with a normalizing pretreatment process after the turning bar portion operation before the modifier treatment operation, the temperature of its normalizing is 920 ℃～940 ℃, is incubated after 20～40 minutes air cooling.
The manufacturing process of the above high-strength bolt of aforesaid a kind of 1300MPa level, wherein said when roll extrusion fillet operation, adopt blasting process and roll extrusion fillet operation to form the complex intensifying operation again.
The invention has the beneficial effects as follows and adapted to mechanical industry, developing of automobile industry particularly, further improve the intensity rank of bolt, use 42CrMoVNb high-strength bolt new steel grade, optimized the manufacturing process of high-strength bolt, solve the delayed fracture and the FATIGUE FRACTURE PROBLEMS of bolt under the high strength more, can satisfy as requirements such as the lightweight of automobile and long-lives, and can fill up the above high-strength bolt of 1300MPa level blank at home.
Purpose of the present invention, advantage and characteristics will make an explanation by the non-limitative illustration of following preferential embodiment, and these embodiment only provide as an example.
The specific embodiment
Embodiment one:
The present invention is in real work, it adopts the 42CrMoVNb steel, it includes blanking operation, machining blanks operation, annealing operation, cold-heading molding operation, turning bar portion operation, modifier treatment operation, grinding process, flaw detection operation, rolled thread operation, roll extrusion fillet operation, surface treatment procedure and flaw detection operation in regular turn, for satisfying the requirement of bolt cold-heading molding, annealing operation adopts an annealing process, its spheroidizing temperature is 740 ℃, be incubated 5 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than HV170; In described modifier treatment operation, adopt quench hot and high-temperature tempering process (being significantly higher than tradition quenching, the temperature of high-strength bolt), and the normalizing preliminary treatment before quenching, guaranteed that its hardening heat of 1300MPa grade high-strength bolt good comprehensive mechanical properties is 920 ℃, be incubated 20 minutes, oil cooling, 590 ℃ of temperatures, be incubated 90 minutes, water-cooled.
Embodiment two
The present invention in actual use, it adopts the 42CrMoVNb steel, it includes blanking operation, machining blanks operation, annealing operation, cold-heading molding operation, turning bar portion operation, modifier treatment operation, grinding process, flaw detection operation, rolled thread operation, roll extrusion fillet operation, surface treatment procedure and flaw detection operation in regular turn, for satisfying the requirement of bolt cold-heading molding, annealing operation adopts an annealing process, its spheroidizing temperature is 750 ℃, be incubated 6 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than HV170; In described modifier treatment operation, its hardening heat is 930 ℃, is incubated 30 minutes, oil cooling, and 600 ℃ of temperatures are incubated 100 minutes, water-cooled.For the better 1300MPa grade high-strength bolt good comprehensive mechanical properties that guarantees, before the modifier treatment operation, be provided with a normalizing pretreatment process after the turning bar portion operation, the temperature of its normalizing is 920 ℃, is incubated after 20 minutes air cooling.
Embodiment three
The present invention in actual use, it adopts the 42CrMoVNb steel, it includes blanking operation, machining blanks operation, annealing operation, cold-heading molding operation, turning bar portion operation, modifier treatment operation, grinding process, flaw detection operation, rolled thread operation, roll extrusion fillet operation, surface treatment procedure and flaw detection operation in regular turn, for satisfying the requirement of bolt cold-heading molding, annealing operation adopts an annealing process, its spheroidizing temperature is 760 ℃, be incubated 7 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than HV170; In described modifier treatment operation, its hardening heat is 940 ℃, is incubated 25 minutes, oil cooling, and 610 ℃ of temperatures are incubated 110 minutes, water-cooled.When roll extrusion fillet operation, adopt blasting process and roll extrusion fillet operation to form the complex intensifying operation again.Because knuckle by rolled thread screw thread after the heat treatment and roll extrusion bolt head and bar portion, make these positions obtain surface compress residual stresses, to reduce the concentrated adverse effect of stress herein, and raising bolt fatigue, adopt simultaneously the shot-peening composite reinforcement process again, further increase the whole strengthening effect of bolt, and improved the corrosion resisting property of bolt to a certain extent.
Embodiment four
The present invention in actual use, it adopts the 42CrMoVNb steel, it includes blanking operation, machining blanks operation, annealing operation, cold-heading molding operation, turning bar portion operation, modifier treatment operation, grinding process, flaw detection operation, rolled thread operation, roll extrusion fillet operation, surface treatment procedure and flaw detection operation in regular turn, for satisfying the requirement of bolt cold-heading molding, annealing operation adopts an annealing process, its spheroidizing temperature is 755 ℃, be incubated 8 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than HV170; In described modifier treatment operation, adopt quench hot and high-temperature tempering process (being significantly higher than tradition quenching, the temperature of high-strength bolt), and the normalizing preliminary treatment before quenching, guaranteed 1300MPa grade high-strength bolt good comprehensive mechanical properties, its hardening heat is 935 ℃, is incubated 25 minutes, oil cooling, 615 ℃ of temperatures are incubated 120 minutes, water-cooled.Be provided with a normalizing pretreatment process after the turning bar portion operation before the modifier treatment operation, the temperature of its normalizing is 940 ℃, is incubated after 40 minutes air cooling.When roll extrusion fillet operation, adopt blasting process to combine again and form the complex intensifying operation with roll extrusion fillet operation.
Manufacturing process, particularly surface peening (as rolled thread, roll extrusion, shot-peening) and the surface treatment of research 1300MPa grade high-strength bolt are handled as DAC (Dacroment) processing, phosphatization, to the influence of bolt surface residual stress, fatigue behaviour and delayed fracture property.Primary Study shows, the rolled thread of bolt, roll extrusion, pill spraying surface reinforcing are except that having the routine effect that improves fatigue behaviour, can also improve delayed fracture property and reduce notch sensitivity, DAC (Dacroment) and phosphatization treatment surface are handled the residual compressive stress that then can reduce the bolt surface, reduce fatigue behaviour thus.
Use the 42CrMoVNb new steel grade, its chemical analysis sees Table 1, develops the 1300MPa grade high-strength bolt of latest domestic, and its main mechanical property sees Table 2.
The chemical analysis of table 1 42CrMoVNb steel (mass fraction, %)
| C | Mn | Si | P | S | Cr | Mo | V | Nb | Als |
| 0.43 | 0.30 | 0.14 | 0.003 | 0.001 | 1.10 | 0.52 | 0.33 | 0.04 | 0.01 |
The main mechanical property of table 2 1300MPa grade high-strength bolt
| σ b，MPa | σ 0.2，MPa | δ5，％ | Fatigue and delayed fracture property | Notch sensitivity |
| ＞1300 | ＞1170 | ＞14 | Apparently higher than 12.9 grade bolts | Insensitive |
Claims (7)
1. the manufacturing process of the above high-strength bolt of 1300MPa level, it includes blanking operation, machining blanks operation, annealing operation, cold-heading molding operation, turning bar portion operation, modifier treatment operation, grinding process, flaw detection operation, rolled thread operation, roll extrusion fillet operation, surface treatment procedure and flaw detection operation in regular turn, it is characterized in that described annealing operation adopts an annealing process, its spheroidizing temperature is 740 ℃～760 ℃, be incubated 5～8 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than Vickers hardness 170; In described modifier treatment operation, hardening heat is 920 ℃～940 ℃, is incubated 20～30 minutes, oil cooling, and 590 ℃～615 ℃ of temperatures are incubated 90～120 minutes, water-cooled.
2. the manufacturing process of the above high-strength bolt of a kind of 1300MPa level according to claim 1, it is characterized in that before the modifier treatment operation, being provided with a normalizing pretreatment process after the turning bar portion operation, the temperature of its normalizing is 920 ℃～940 ℃, is incubated after 20～40 minutes air cooling.
3. the manufacturing process of the above high-strength bolt of a kind of 1300MPa level according to claim 1 and 2 is characterized in that when roll extrusion fillet operation, adopts blasting process and roll extrusion fillet operation to form the complex intensifying operation again.
4. the manufacturing process of the above high-strength bolt of a kind of 1300MPa level according to claim 1, the spheroidizing temperature that it is characterized in that described annealing process is 740 ℃, be incubated 5 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than Vickers hardness 170; In described modifier treatment operation, its hardening heat is 920 ℃, is incubated 20 minutes, oil cooling, and 590 ℃ of temperatures are incubated 90 minutes, water-cooled.
5. the manufacturing process of the above high-strength bolt of a kind of 1300MPa level according to claim 1 and 2, the spheroidizing temperature that it is characterized in that described annealing process is 750 ℃, be incubated 6 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than Vickers hardness 170; In described modifier treatment operation, its hardening heat is 930 ℃, is incubated 30 minutes, oil cooling, 600 ℃ of temperatures are incubated 100 minutes, and water-cooled is provided with a normalizing pretreatment process after the turning bar portion operation before the modifier treatment operation, the temperature of its normalizing is 920 ℃, is incubated after 20 minutes air cooling.
6. the manufacturing process of the above high-strength bolt of a kind of 1300MPa level according to claim 1, the spheroidizing temperature that it is characterized in that described annealing process is 760 ℃, be incubated 7 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than Vickers hardness 170; In described modifier treatment operation, its hardening heat is 940 ℃, is incubated 25 minutes, oil cooling, and 610 ℃ of temperatures are incubated 110 minutes, and water-cooled when roll extrusion fillet operation, adopts blasting process and roll extrusion fillet operation to form the complex intensifying operation again.
7. the manufacturing process of the above high-strength bolt of a kind of 1300MPa level according to claim 1, the spheroidizing temperature that it is characterized in that described annealing process is 755 ℃, be incubated 8 hours, stove is chilled to 500 ℃ of air coolings of coming out of the stove, and annealing back hardness is less than Vickers hardness 170; In described modifier treatment operation, its hardening heat is 935 ℃, is incubated 25 minutes, oil cooling, 615 ℃ of temperatures are incubated 120 minutes, water-cooled, before the modifier treatment operation, be provided with a normalizing pretreatment process after the turning bar portion operation, the temperature of its normalizing is 940 ℃, is incubated after 40 minutes air cooling, when roll extrusion fillet operation, adopt blasting process to combine again and form the complex intensifying operation with roll extrusion fillet operation.
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| CN 03113218 CN1209209C (en) | 2003-04-17 | 2003-04-17 | Production process of high strength bolt with above 1300MPa |
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| CN 03113218 CN1209209C (en) | 2003-04-17 | 2003-04-17 | Production process of high strength bolt with above 1300MPa |
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| CN1209209C true CN1209209C (en) | 2005-07-06 |
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- 2003-04-17 CN CN 03113218 patent/CN1209209C/en not_active Expired - Lifetime
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| CN1443946A (en) | 2003-09-24 |
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Assignee: NANJING IVECO AUTOMOBILE Co.,Ltd. Assignor: NANJING AUTOMOBILE (GROUP) Corp. Contract fulfillment period: 2008.8.15 to 2023.4.17 Contract record no.: 2008320000993 Denomination of invention: Production process of high strength bolt with above 1300MPa Granted publication date: 20050706 License type: Exclusive license Record date: 20081016 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.8.15 TO 2023.4.17; CHANGE OF CONTRACT Name of requester: NANJING YIWEIKE CAR CO., LTD. Effective date: 20081016 |
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