CN1084647C - Technology for manufacturing fully-threaded bright and high-strength very long screw bolt - Google Patents
Technology for manufacturing fully-threaded bright and high-strength very long screw bolt Download PDFInfo
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- CN1084647C CN1084647C CN99122572A CN99122572A CN1084647C CN 1084647 C CN1084647 C CN 1084647C CN 99122572 A CN99122572 A CN 99122572A CN 99122572 A CN99122572 A CN 99122572A CN 1084647 C CN1084647 C CN 1084647C
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000005516 engineering process Methods 0.000 title claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000001953 recrystallisation Methods 0.000 claims description 24
- 238000000137 annealing Methods 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000007669 thermal treatment Methods 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 8
- 238000010622 cold drawing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 2
- 229910000746 Structural steel Inorganic materials 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 239000003607 modifier Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910001149 41xx steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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Abstract
The present invention belongs to a processing and shaping production method, particularly to a production method for processing a fully-threaded screw bolt by using low-alloy structural steel containing Cr and Mo as raw materials. The present invention is characterized in that the production method comprises the following steps that 1, materials selection and advanced heat treatment; 2, cold deformation technology; 3, recovery heat treatment technology after crystallization. The present invention has the advantages of good material plasticity, improved product surface quality, reduced production cost by more than 1000 yuan / ton, and saved energy resources.
Description
The invention belongs to a kind of production method that workpiece is carried out machine-shaping, particularly relating to a kind of is the production method of raw material processing screw bolt with the structural low that contains the CrMo element.
---drawing deformation---alignment---screw thread rolled thread---modifier treatment [(860 ± 20 ℃)+high tempering (640 ℃) quenches] that the production technique that domestic and international at present production high strength bolt generally adopts is: annealing (760 ± 20 ℃), product after the rolled thread carries out " modifier treatment ", cause the surface quality extreme difference, if " modifier treatment " carried out before the screw thread rolled thread, the thermal etching hole that " modifier treatment " produces also has a strong impact on surface quality of products; Adopt gas shield or vacuum-treat, can improve surface quality of products, but cause production cost of products to increase substantially, and use conventional Equipment for Heating Processing to be difficult to realize producing in batches the bolt product (3.7 meters) of " overlength ".
Just successfully produce " light, overlength, high strength perfect thread double-screw bolt " as far back as the eighties abroad, but all use " gas shield " or specific equipments such as " vacuum-treat ", still carry out the thermal treatment process of " modifier treatment ".China market does not still have the demand of " light, overlength, high strength perfect thread double-screw bolt " at present, its reason is that to recognize that not this product has easy to use, flexibly, advantage such as be widely used, existing production technology can't be produced and conforms with " product " that " standard " requires at present in addition.Before the present invention is come out, the domestic qualified product that can't produce " light, overlength, the high strength perfect thread double-screw bolt " that satisfy ASTM A-193 B7 standard.
At problem set forth above, the invention provides a kind of production light, overlength, the production method of high strength perfect thread double-screw bolt, its purpose are to reduce this processing step of ＂ modifier treatment ＂, improve the quality of products, can realize producing in batches the bolt product of overlength, reduce production costs.
The present invention is achieved through the following technical solutions: a kind of production method of producing light, overlength, high strength perfect thread double-screw bolt is characterized in that this production method adopts following steps to carry out: (1) selection and thermal treatment in advance;
With the 35CrMo or the 42CrMo round stock of hot-rolled state, adopt low-temperature annealing to handle, 550 ℃～650 ℃, soaking time is greater than 1 hour, so that carry out " drawing deformation "; (2) cold deformation technology;
Adopt " drawing deformation " undergauge, make the surface quality of round steel and dimensional precision reach " rolled thread " preceding technical requirements, drawing deformation can adopt a cold-drawn or twice cold-drawing technology, and total deformation should be greater than 12%; (3) recovery and recrystallization thermal treatment process; Material after the cold deformation is through the recovery and recrystallization anneal, and temperature is 500 ℃～600 ℃, and soaking time was greater than 2 hours.
35CrMo can not carry out low-temperature annealing to be handled, and directly carries out drawing deformation; Behind the drawing deformation, carry out " recovery and recrystallization " anneal, Heating temperature is between 500 ℃～600 ℃, and soaking time was greater than 2 hours.
Advantage of the present invention and effect:
Technical scheme of the present invention and invention main points are: adopt " cold deformation+recovery and recrystallization annealing " technology to produce " light, overlength, high strength perfect thread double-screw bolt " first, this processing technology can improve intensity more than 10% by " drawing deformation ", by recovery and recrystallization thermal treatment subsequently, improve its plasticity index---unit elongation, make unit elongation δ
5Reach more than 16%, rely on organic cooperation of " cold deformation " and " recovery and recrystallization thermal treatment " processing parameter, make " light, overlength, high strength perfect thread double-screw bolt " product reach the requirement of international and domestic standard.
Make a concrete analysis of this invention and compare with " modifier treatment " explained hereafter " light, overlength, high strength perfect thread double-screw bolt ", following advantage is arranged with existing:
(1) behind employing the present invention, adopts low-temperature annealing (550 ℃～640 ℃) to handle before the drawing deformation, material is obtained and good plasticity, and exceed loss intensity, have the effect of save energy.
(2) adopt " drawing deformation+recovery and recrystallization annealing " technology to replace " modifier treatment " technology, its meaning is: reduce quenching process, save energy, make production cost reduce more than 1000 yuan/ton, while product surface light, no corrosion pit has improved surface quality of products, and low cost production " light, overlength, high strength perfect thread double-screw bolt " is become a reality.
(3) adopt production of the present invention " light, overlength, high strength perfect thread double-screw bolt ", can not use " gas shield " and " vacuum-treat " technology, reduce facility investment." anneal " temperature of twice use is low in this technology, and wide ranges does not need special Equipment for Heating Processing, and is easy to implement in the production, therefore has stronger practicality.
(4) adopt low cost production of the present invention " light, overlength, high strength perfect thread double-screw bolt ", help the promotion and application of this product, while product surface light, no corrosion pit, low cost production " overlength high strength bolt " is become a reality, bring considerable economic and social benefit can for the standardized component industry.(5) light, overlength, high strength perfect thread double-screw bolt are a kind of fastening pieces that adopts no machining extrusion molding, are applied to pressurized vessel, oil drilling, machinery, any occasion that needs high-intensity fasteners such as metallurgy industry.The use of overlength bolt product is very extensive and convenient, can flexible Application in the occasion of required all lengths, intercept arbitrarily according to needed length.The present invention is not only applicable to the production of light, overlength, high strength perfect thread double-screw bolt, is applicable to the production of short " bolt " yet.
Below by embodiment the present invention is specifically described:
---drawing deformation---recovery and recrystallization annealing (500 ℃～600 ℃)---alignment---bolt rolled thread---immersion oil---vanning that technical process of the present invention is: low-temperature annealing (560 ℃～640 ℃).
Implementing main points of the present invention is: the first, and choose 35CrMo or 42CrMo round steel as raw material, and carry out low-temperature annealing; The second, adopt " drawing deformation+recovery and recrystallization annealing " and technical process; The 3rd, select suitable cold deformation technology, mainly be suitable total deformation rate; The 4th; Select suitable recovery and recrystallization thermal treatment process, both proper heat treatment temperature and soaking time.Below be described below with regard to the essential implementation of technical process: example one: with original performance be: σ
b=1125MPa, δ=12%, the 42CrMo round steel of φ 22mm was in 640 ℃ of annealing 1 hour, and to φ 22mm, after 2 hours, the mechanical property of acquisition is: σ through 510 ℃ of recrystallization annealings through the drawing deformation undergauge
b=921MPa, σ
0.2=771MPa, δ=19%, Ψ=55%.Example two: with original performance be: σ
b=1125MPa, δ=12%, the 42CrMo round steel of φ 24mm was in 600 ℃ of annealing 1 hour, and to φ 22mm, after 2 hours, the mechanical property of acquisition is: σ through 520 ℃ of recrystallization annealings through the drawing deformation undergauge
b=1008MPa, σ
0.2=915MPa, δ=20.4%, Ψ=53%.Example three: with original performance be: σ
b=950MPa, δ=13%, the direct cold-drawn of 35CrMo round steel of φ 20mm, deformation rate is: 38.46%, after 2 hours, the mechanical property of acquisition is: σ through 600 ℃ of recrystallization annealings
b=940MPa, σ
0.2=850MPa, δ=17%, Ψ=53%.Example four: with original performance be: σ
b=950MPa, δ=13%, diameter are that after 2 hours, the mechanical property of acquisition was: σ through 580 ℃ of recrystallization annealings after the direct drawing deformation undergauge of the 35CrMo round steel of φ 22mm was φ 19.2mm to diameter
b=892MPa, σ
0.2=849MPa, δ=17.8%, Ψ=55%.
Adopt " drawing deformation " undergauge, make the surface quality and the dimensional precision of round steel reach " rolled thread " preceding technical requirements (precision is in the tolerance zone of machine finshing), cold deformation can be adopted a cold-drawn or twice cold-drawing technology, total deformation should be greater than 12%, if before the drawing deformation, tensile strength is lower, can suitably improve deformation rate.This drawing deformation technology can improve intensity more than 10%, but plasticity index---unit elongation, reduction significantly can improve plasticity by the recovery and recrystallization thermal treatment process.
After the alignment of work in-process round steel, carry out final " screw thread rolled thread " technology, do not influence comprehensive mechanical performance, and make product obtain the surface of light, thereby realized the production of " light, overlength, high strength perfect thread double-screw bolt ".In this technology, " anneal " temperature of twice use is low, and wide ranges does not need special Equipment for Heating Processing, and is easy to implement in the production, therefore has stronger practicality.
For producing " light, overlength (3.7) high strength perfect thread double-screw bolt ", adopt " low-temperature annealing " to improve the plasticity of material, and exceed loss intensity; Drawing deformation to be improving the intensity of material, and makes the technical requirements before surface quality and dimensional precision reach rolled thread; The recovery and recrystallization anneal of carrying out afterwards neither influences dimensional precision, can reach the effect that makes material " strengthen toughness reinforcing " again; Replace conventional " modifier treatment " technology with " cold deformation+recovery and recrystallization annealing " technology, reduce production costs, be the characteristics that the present invention has.Can eliminate the internal stress that produces because of cold deformation, improve the plasticity of material greatly, make unit elongation, and have the effect that improves intensity concurrently, guarantee " strength and toughness " of material, make it have good comprehensive mechanical properties greater than 16%; Eliminate material surface simultaneously because of " cold working hardening " phenomenon that " cold deformation " produces, reduced surface hardness, so that post-order process---the carrying out of " screw thread rolled thread "." the recovery and recrystallization anneal " of before the rolled thread operation, carrying out, the temperature of using is lower, handle the metallic surface, back and do not produce the thermal etching hole, can guarantee that still the surfaceness of processed workpiece reaches the requirement of technology, wherein " cold deformation+recovery and recrystallization anneal " process application has novelty in the production of " high strength bolt " product.Above product comprehensive mechanical property all reaches U.S. ASTM A-193, " light, overlength, high strength perfect thread double-screw bolt " technology of standard more than 8.8 grades among B7 standard and the GB3098.1-82, it is characterized in that adopting " drawing deformation+recovery and recrystallization annealing " technical process, to replace traditional " modifier treatment " technology; At first carry out " drawing deformation ", and the control total deformation is not less than 12%, be guarantees the carrying out of drawing deformation, the 42CrMo steel can adopt " low-temperature annealing (550 ℃～640 ℃, insulation was greater than 1 hour) is handled " to improve plasticity, tensile strength sigma
bBe not less than 830MPa, 35CrMo can not carry out low-temperature annealing to be handled, and directly carries out drawing deformation; Behind the drawing deformation, carry out " recovery and recrystallization " anneal, Heating temperature is between 500 ℃～600 ℃, and soaking time was greater than 2 hours, thus the tensile strength sigma of assurance product
b〉=870MPa, yield strength σ
0.2〉=730MPa, unit elongation δ
5〉=16%, relative reduction in area φ 〉=50%.
Claims (2)
1, a kind of production method of perfect thread double-screw bolt is characterized in that: this production method adopts following steps to carry out:
(1) selection and thermal treatment in advance:
With the 35CrMo or the 42CrMo round stock of hot-rolled state, adopt low-temperature annealing to handle, 550 ℃～650 ℃, soaking time is greater than 1 hour, so that carry out " drawing deformation ":
(2) cold deformation technology:
Adopt " drawing deformation " undergauge, make the surface quality of round steel and dimensional precision reach " rolled thread " preceding technical requirements be precision in the tolerance zone of machine finshing, drawing deformation can adopt a cold-drawn or twice cold-drawing technology, total deformation should be greater than 12%;
(3) recovery and recrystallization thermal treatment process;
Material after the cold deformation is through the recovery and recrystallization anneal, and temperature is 500 ℃～600 ℃, and soaking time was greater than 2 hours.
2, the production method of a kind of perfect thread double-screw bolt according to claim 1, it is characterized in that: 35CrMo does not carry out low-temperature annealing to be handled, directly carry out drawing deformation: behind the drawing deformation, carry out " recovery and recrystallization " anneal, Heating temperature is between 500 ℃～600 ℃, and soaking time was greater than 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99122572A CN1084647C (en) | 1999-11-30 | 1999-11-30 | Technology for manufacturing fully-threaded bright and high-strength very long screw bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99122572A CN1084647C (en) | 1999-11-30 | 1999-11-30 | Technology for manufacturing fully-threaded bright and high-strength very long screw bolt |
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| Publication Number | Publication Date |
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| CN1255417A CN1255417A (en) | 2000-06-07 |
| CN1084647C true CN1084647C (en) | 2002-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN99122572A Expired - Fee Related CN1084647C (en) | 1999-11-30 | 1999-11-30 | Technology for manufacturing fully-threaded bright and high-strength very long screw bolt |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100543319C (en) * | 2008-05-04 | 2009-09-23 | 浙江乍浦实业股份有限公司 | A kind of production method of high-strength nut |
| CN103122405B (en) * | 2011-11-21 | 2015-12-09 | 郑州水野大一热处理技术有限公司 | A kind of Heat treatment technology of high-strength bolt |
| CN102505805A (en) * | 2011-11-22 | 2012-06-20 | 江苏国建新材料股份有限公司 | Mixed reinforcement high-strength reinforced concrete component |
| CN102943160A (en) * | 2012-11-22 | 2013-02-27 | 南宁哈威尔紧固件有限公司 | Annealing method for stress relief of hexagonal head bolt |
| CN103114196B (en) * | 2013-01-18 | 2015-02-04 | 浙江建宏链传动材料有限公司 | Continuous production technology of chain sleeve material |
| CN103212957B (en) * | 2013-05-10 | 2016-02-03 | 江苏永昊高强度螺栓有限公司 | Processing method of high-strength bolts |
| CN110055382B (en) * | 2019-05-10 | 2020-07-17 | 安徽长江紧固件有限责任公司 | Manufacturing method of torsional shear type stud |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0099617A2 (en) * | 1982-07-19 | 1984-02-01 | Allegheny Ludlum Steel Corporation | Method for producing cube-on-edge oriented silicon steel |
| CN88103090A (en) * | 1987-05-22 | 1988-12-07 | 川崎制铁株式会社 | Method and apparatus for pretreatment of stainless steel for cold rolling |
| CN1171304A (en) * | 1997-02-14 | 1998-01-28 | 沈阳工业大学 | Technique for cold rolling finned reinforcing bars higher than 800 megapascals with ordinary carbon steel |
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1999
- 1999-11-30 CN CN99122572A patent/CN1084647C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0099617A2 (en) * | 1982-07-19 | 1984-02-01 | Allegheny Ludlum Steel Corporation | Method for producing cube-on-edge oriented silicon steel |
| CN88103090A (en) * | 1987-05-22 | 1988-12-07 | 川崎制铁株式会社 | Method and apparatus for pretreatment of stainless steel for cold rolling |
| CN1171304A (en) * | 1997-02-14 | 1998-01-28 | 沈阳工业大学 | Technique for cold rolling finned reinforcing bars higher than 800 megapascals with ordinary carbon steel |
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| CN1255417A (en) | 2000-06-07 |
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