CN1255417A - 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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- CN1255417A CN1255417A CN99122572A CN99122572A CN1255417A CN 1255417 A CN1255417 A CN 1255417A CN 99122572 A CN99122572 A CN 99122572A CN 99122572 A CN99122572 A CN 99122572A CN 1255417 A CN1255417 A CN 1255417A
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Abstract
A technology for manufacturing fully-threaded screw bolt with the low-alloy steel containing Cr and Mo elements includes selecting raw material, preheating, cold deformation, recovering, and heat treatment of crystallization. The resulstant product features high plasticity, high surface quality, and saving energy.
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 low-alloy structural steel that contains the CrMo element.
---drawing deformation---alignment---screw thread rolled thread---modifier treatment [(860 ± 20 ℃)+high tempering (640 ℃) quenches] that the production technology 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 heat erosion hole that " modifier treatment " produces also has a strong impact on surface quality of products; Adopt gas shield or application of vacuum, 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 full thread double-screw bolt " as far back as the eighties abroad, but all use " gas shield " or special equipments such as " applications of vacuum ", still carry out the Technology for Heating Processing of " modifier treatment ".China market does not still have the demand of " light, overlength, high strength full 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 products that can't produce " light, overlength, the high strength full 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 full thread double-screw bolt, its purpose are to reduce " modifier treatment " this processing step, 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 full thread double-screw bolt is characterized in that this production method adopts following steps to carry out: (1) selection and heat treatment in advance;
With the 35CrMo or the 42CrMo round stock of hot-rolled state, adopt process annealing to handle, 550 ℃～650 ℃, temperature retention 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 accuracy reach " rolled thread " preceding specification requirement, drawing deformation can adopt a cold-drawn or twice cold-drawing technology, and total deformation should be greater than 12%; (3) recovery and recrystallization Technology for Heating Processing; Material after the cold deformation is through the recovery and recrystallization annealing in process, and temperature is 500 ℃～600 ℃, and temperature retention time was greater than 2 hours.
35CrMo can not carry out process annealing to be handled, and directly carries out drawing deformation; Behind the drawing deformation, carry out " recovery and recrystallization " annealing in process, heating-up temperature is between 500 ℃～600 ℃, and temperature retention 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 full thread double-screw bolt " first, this process technology can improve intensity more than 10% by " drawing deformation ", by recovery and recrystallization heat treatment subsequently, improve its plasticity index---percentage elongation, make percentage elongation δ
5Reach more than 16%, rely on organic cooperation of " cold deformation " and " recovery and recrystallization heat treatment " technological parameter, make " light, overlength, high strength full 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 full thread double-screw bolt ", following advantage is arranged with existing:
(1) behind employing the present invention, adopts process annealing (550 ℃～640 ℃) to handle before the drawing deformation, material is obtained and good plasticity, and exceed loss intensity, have the effect of energy savings.
(2) adopt " drawing deformation+recovery and recrystallization annealing " technology to replace " modifier treatment " technology, its meaning is: reduce quenching process, energy savings, make production cost reduce more than 1000 yuan/ton, while product surface light, no etch pit has improved surface quality of products, and low-cost production " light, overlength, high strength full thread double-screw bolt " is become a reality.
(3) adopt production of the present invention " light, overlength, high strength full thread double-screw bolt ", can not use " gas shield " and " application of vacuum " technology, reduce equipment investment." annealing in process " 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 full thread double-screw bolt ", help the promotion and application of this product, while product surface light, no etch pit, low-cost production " overlength high-strength bolt " is become a reality, bring considerable economic and social benefit can for the standard component industry.(5) light, overlength, high strength full thread double-screw bolt are to adopt no machining extrusion modling-kind of securing member, are applied to pressure 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 full 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 technological process of the present invention is: process 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 process annealing; The second, adopt " drawing deformation+recovery and recrystallization annealing " and technological process; The 3rd, select suitable cold deformation technology, mainly be suitable total deformation rate; The 4th; Select suitable recovery and recrystallization Technology for Heating Processing, both proper heat treatment temperature and temperature retention time.Below be described below with regard to the essential implementation of technological 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=21MPa, 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 cold group of distortion 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 accuracy of round steel reach " rolled thread " preceding specification requirement (precision is in the margin of tolerance of machine finishing), 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---percentage elongation, reduction significantly can improve plasticity by the recovery and recrystallization Technology for Heating Processing.
After the alignment of semi-finished product 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 full thread double-screw bolt ".In this technology, " annealing in process " 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 full thread double-screw bolt ", adopt " process annealing " to improve the plasticity of material, and exceed loss intensity; Drawing deformation to be improving the intensity of material, and makes the specification requirement before surface quality and dimensional accuracy reach rolled thread; The recovery and recrystallization annealing in process of carrying out afterwards neither influences dimensional accuracy, 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 percentage 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 " flow harden " phenomenon that " cold deformation " produces, reduced case hardness, so that post-order process---the carrying out of " screw thread rolled thread "." the recovery and recrystallization annealing in process " of before the rolled thread operation, carrying out, the temperature of using is lower, handle the metal surface, back and do not produce the heat erosion hole, can guarantee that still the surface roughness of processed workpiece reaches the requirement of technology, wherein " cold deformation+recovery and recrystallization annealing in process " 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 full 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 " technological 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 " process 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 process annealing to be handled, and directly carries out drawing deformation; Behind the drawing deformation, carry out " recovery and recrystallization " annealing in process, heating-up temperature is between 500 ℃～600 ℃, and temperature retention time was greater than 2 hours, thus the tensile strength sigma of assurance product
b〉=870MPa, yield strength σ
0.2〉=730MPa, percentage elongation δ
5〉=16%, contraction percentage of area φ 〉=50%.
Claims (2)
1, a kind of production method of producing light, overlength, high strength full thread double-screw bolt is characterized in that this production method adopts following steps to carry out:
(1) selection and heat treatment in advance;
With the 35CrMo or the 42CrMo round stock of hot-rolled state, adopt process annealing to handle, 550 ℃～650 ℃, temperature retention time is greater than 1 hour, so that carry out " drawing deformation ";
(2) cold deformation technology;
Adopt " drawing deformation " undergauge, make the surface quality and the dimensional accuracy of round steel reach " rolled thread " preceding specification requirement (precision is in the margin of tolerance of machine finishing), drawing deformation can adopt a cold-drawn or twice cold-drawing technology, and total deformation should be greater than 12%;
(3) recovery and recrystallization Technology for Heating Processing;
Material after the cold deformation is through the recovery and recrystallization annealing in process, and temperature is 500 ℃～600 ℃, and temperature retention time was greater than 2 hours.
2, a kind of production method of producing light, overlength, high strength full thread double-screw bolt according to claim 1 is characterized in that: 35CrMo does not carry out process annealing to be handled, and directly carries out drawing deformation; Behind the drawing deformation, carry out " recovery and recrystallization " annealing in process, heating-up temperature is between 500 ℃～600 ℃, and temperature retention 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 |
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| 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 true CN1255417A (en) | 2000-06-07 |
| CN1084647C CN1084647C (en) | 2002-05-15 |
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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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103114196A (en) * | 2013-01-18 | 2013-05-22 | 浙江建宏链传动材料有限公司 | Continuous production technology of chain sleeve material |
| CN103122405A (en) * | 2011-11-21 | 2013-05-29 | 郑州水野大一热处理技术有限公司 | Heat treatment technology of high-strength bolt |
| CN103212957A (en) * | 2013-05-10 | 2013-07-24 | 江苏永昊高强度螺栓有限公司 | High-strength bolt processing method |
| CN110055382A (en) * | 2019-05-10 | 2019-07-26 | 安徽长江紧固件有限责任公司 | A kind of manufacturing method of torque-shear type stud |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1202549A (en) * | 1982-07-19 | 1986-04-01 | Robert F. Miller | Method for producing cube-on-edge oriented silicon steel |
| US4885042A (en) * | 1987-05-22 | 1989-12-05 | Kawasaki Steel Corp. | Method and apparatus for preliminary treatment 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 |
-
1999
- 1999-11-30 CN CN99122572A patent/CN1084647C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122405A (en) * | 2011-11-21 | 2013-05-29 | 郑州水野大一热处理技术有限公司 | Heat treatment technology of high-strength bolt |
| 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 |
| CN103114196A (en) * | 2013-01-18 | 2013-05-22 | 浙江建宏链传动材料有限公司 | Continuous production technology of chain sleeve material |
| CN103212957A (en) * | 2013-05-10 | 2013-07-24 | 江苏永昊高强度螺栓有限公司 | High-strength bolt processing method |
| 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 |
| CN110055382A (en) * | 2019-05-10 | 2019-07-26 | 安徽长江紧固件有限责任公司 | A kind of manufacturing method of torque-shear type stud |
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| Publication number | Publication date |
|---|---|
| CN1084647C (en) | 2002-05-15 |
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