CN103131954A - Preparation method of fracture-resistant steel rope bolt - Google Patents
Preparation method of fracture-resistant steel rope bolt Download PDFInfo
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- CN103131954A CN103131954A CN2013100421542A CN201310042154A CN103131954A CN 103131954 A CN103131954 A CN 103131954A CN 2013100421542 A CN2013100421542 A CN 2013100421542A CN 201310042154 A CN201310042154 A CN 201310042154A CN 103131954 A CN103131954 A CN 103131954A
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Abstract
The invention discloses a preparation method of a fracture-resistant steel rope bolt. The process includes following steps: a. casting rod material, wherein a blank of the rod material comprises, in terms of chemical component, by weight, 0.132%-0.260% of C, 0.62%-1.30% of Si, 0.25%-0.35% of Mn, 0.010%-0.030% of P, 0.010%-0.030% of S, 1.10%-1.50% of Cr, trace quantity-0.0018% of B, 0.012%-0.030% of Cu, and the balances are Fe and inevitable impurities; b. washing the rod material after casting molding in acid, conducting thread drawing for the rod material according to the requirement of thread diameter of the bolt to enable the rod material to shrink to the required thread diameter, cutting the rod material after thread diameter shrinks to the required length of the bolt, placing the cutting-off rod material into a mould shaped cavity which is covered by plant ashes at normal temperature, enabling the rod material to form a required head part and required size of a rod part of the bolt by applying upset forging force, and making screw threads on the periphery face of the rod part of the rod material through turning by using a precision lathe. According to the preparation method of the fracture-resistant steel rope bolt, cold extrusion process is applied to process the bolt, so that the strength of the bolt is improved, required hardness and strength of a high-strength bolt are reached, and the problem that delayed fracture and fatigue fracture of the bolt under high strength is solved. The bolt is reliable to use in connection, not easy to break, and the service life of the bolt is prolonged.
Description
Technical field
The present invention relates to the working method of bolt, especially a kind of preparation method of anti-fracture wire bolt.
Background technology
Wire bolt is fastening piece commonly used in machinery industry, and present processing mode is generally the moulding of turning, and intensity often is difficult to guarantee, sometimes in use produce turn around, the dangerous phenomenon such as bar section fracture, endanger very large to industrial production.Therefore the high strength bolt production method is studied and improved, guaranteed the quality stability of high strength bolt, technology and expanding economy are had vital role.In addition, when bolt was in relatively moist environment, the corrosion that gets rusty easily finally caused fracture or crackle, forms potential accident source.
Given this, be necessary to provide a kind of wire bolt preparation method, produce more corrosion-resistant, more anti abrasive high strength bolt.
Summary of the invention
The object of the invention is to avoid weak point of the prior art, and a kind of preparation method of anti-fracture wire bolt is provided.
Purpose of the present invention is as follows by the following technical programs:
The preparation method of anti-fracture wire bolt is characterized in that, procedure of processing comprises:
A, casting bar material, in bar material blank, chemical component weight per-cent is: 0.132%≤C≤0.260%, 0.62%≤Si≤1.30%, 0.25%≤Mn≤0.35%, 0.010%≤P≤0.030%, 0.010%≤S≤0.030%, 1.10%≤Cr≤1.50%, trace≤B≤0.0018%, 0.012%≤Cu≤0.030%, surplus are iron and inevitable impurity;
Bar material after b, process casting is done cleanup acid treatment; According to the wire diameter requirement of bolt, it is taken out line, so that described bar material is retracted to the required wire diameter of bolt; The bar material that shrinks after wire diameter is cut to the required length of bolt, and the bar material after cutting off is at normal temperatures put into the mold cavity that is coated with plant ash, makes the required head of bar material formation bolt and bar section size with upset force; Utilize precision lathe at the periphery turning formation screw thread of bar material bar section, the cutter on lathe is Sintox, and the workpiece velocity of rotation guarantees at 3050-3150r.P.M, and begins feed by the relative end of disc head portions, cutting fluid employing water-base cutting fluid;
C, thermal treatment
with the bolt outside screw of precision lathe turning moulding under 740 ℃ ± 10 ℃, quench with quenching oil, bolt after quenching again carries out tempering under 500 ℃, time length 80-100 minute, with the polished rod section of bolt under 800 ℃ ± 20 ℃, the use hardening liquid quenches, bolt after quenching again carries out tempering under 550 ℃, time length 60-70 minute, carry out at last carburizing treatment, carburizing agent is sent in tempering stove, carburizing treatment 80～120min in 1100～1150 ℃ of temperature ranges, described carburizing agent is with potassium felspar sand fine powder 35～50Wt%, granular graphite 15～30Wt% and carbonate or/and supercarbonate 35～50Wt% obtain after mixing,
D, sub-zero treatment: bolt after thermal treatment is packed into to remain to be had in the container of liquid nitrogen, and liquid nitrogen concentration 〉=99.9% carries out sub-zero treatment, and the time is 11-12 hour;
E, Passivation Treatment, it is to process 5-6min in the inactivating treatment liquid of 100-120 ℃ that bolt after sub-zero treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 4～6 parts of water-soluble molybdates, 10～12 parts of urotropines, 80～100 parts of alkaline silica sols, 80～100 parts of water soluble acrylic resins, 80-100 part water;
F, bonderizing are put into 60-80 ℃ of etching solution with the bolt after Passivation Treatment and are soaked 3-5min;
G, chromising process, and the bolt after bonderizing is put into the wetting ferrochrome powder of 25% hydrochloric acid soln heat, and are heated to 700-800 ℃, keep 60-70min, then clean, air-dry, bolt gets product.
The preparation method of anti-fracture wire bolt of the present invention, adopt the processing of cold-extrusion technology bolt, improved the intensity of bolt, reached required hardness value, the intensity level of high strength bolt, solved delayed fracture and the repeated stress failure of bolt under the high strength, in use connected reliably, not frangibility, improve bolt life, satisfied social upper every profession and trade to the user demand of high strength bolt.
Beneficial effect of the present invention is:
1, refinement of the present invention the shaping complete processing of material, make wire rod hardness moderate, the surface has good phosphatization epithelium, lubricity is good, wire rod is without hydrogen embrittlement, plasticity-is good;
2, bolt of the present invention has carried out repeatedly cold-heading extrusion molding, has improved the high strength bolt bulk strength, and the bolt precision is high, and quality is good, and production efficiency is high, and without waste material, unit cost descends greatly without cutting.Obtain bulk metal and flowed to the consistent bolt of direction, greatly improved its tensile strength;
3, the invention of thermal treatment process has broken through the limit of the alloy steel products of bolt prior heat treatment, the leading domestic Investment in fastener industry level of the characteristic of its super-strong and super-toughened property.
Embodiment
The invention will be further described with the following Examples:
The preparation method of anti-fracture wire bolt, procedure of processing comprises:
A, casting bar material, in bar material blank, chemical component weight per-cent is: 0.132%≤C≤0.260%, 0.62%≤Si≤1.30%, 0.25%≤Mn≤0.35%, 0.010%≤P≤0.030%, 0.010%≤S≤0.030%, 1.10%≤Cr≤1.50%, trace≤B≤0.0018%, 0.012%≤Cu≤0.030%, surplus are iron and inevitable impurity;
Bar material after b, process casting is done cleanup acid treatment; According to the wire diameter requirement of bolt, it is taken out line, so that described bar material is retracted to the required wire diameter of bolt; The bar material that shrinks after wire diameter is cut to the required length of bolt, and the bar material after cutting off is at normal temperatures put into the mold cavity that is coated with plant ash, makes the required head of bar material formation bolt and bar section size with upset force; Utilize precision lathe at the periphery turning formation screw thread of bar material bar section, the cutter on lathe is Sintox, and the workpiece velocity of rotation guarantees at 3050-3150r.P.M, and begins feed by the relative end of disc head portions, cutting fluid employing water-base cutting fluid;
C, thermal treatment
with the bolt outside screw of precision lathe turning moulding under 740 ℃ ± 10 ℃, quench with quenching oil, bolt after quenching again carries out tempering under 500 ℃, time length 80-100 minute, with the polished rod section of bolt under 800 ℃ ± 20 ℃, the use hardening liquid quenches, bolt after quenching again carries out tempering under 550 ℃, time length 60-70 minute, carry out at last carburizing treatment, carburizing agent is sent in tempering stove, carburizing treatment 80～120min in 1100～1150 ℃ of temperature ranges, described carburizing agent is with potassium felspar sand fine powder 35～50Wt%, granular graphite 15～30Wt% and carbonate or/and supercarbonate 35～50Wt% obtain after mixing, add up to absolutely.
D, sub-zero treatment: bolt after thermal treatment is packed into to remain to be had in the container of liquid nitrogen, and liquid nitrogen concentration 〉=99.9% carries out sub-zero treatment, and the time is 11-12 hour;
E, Passivation Treatment, it is to process 5-6min in the inactivating treatment liquid of 100-120 ℃ that bolt after sub-zero treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 4～6 parts of water-soluble molybdates, 10～12 parts of urotropines, 80～100 parts of alkaline silica sols, 80～100 parts of water soluble acrylic resins, 80-100 part water;
F, bonderizing are put into 70 ℃ of etching solutions with the bolt after Passivation Treatment and are soaked 4min;
G, chromising process, and the bolt after bonderizing is put into the wetting ferrochrome powder of 25% hydrochloric acid soln heat, and are heated to 700-800 ℃, keep 60-70min, then clean, air-dry, bolt gets product.
The bolt of producing according to the preparation method of anti-fracture wire bolt of the present invention, as follows through detecting its mechanical property numerical value of test, the bolt centre hardness reaches 42-45HRC, tensile strength reaches 1120Mpa, yield strength reaches 1230Mpa, unit elongation is greater than 11%, relative reduction in area is greater than 34%, and impelling strength is greater than 57J/cm
2, the high 10-12% of bolt that comprehensive mechanical performance produces than existing technique.
Should be noted that at last; above embodiment only is used for technical scheme of the present invention being described but not limiting the scope of the invention; although with reference to preferred embodiment, the present invention has been done detailed description; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
Claims (2)
1. the preparation method of anti-fracture wire bolt, is characterized in that, procedure of processing comprises:
A, casting bar material, in bar material blank, chemical component weight per-cent is: 0.132%≤C≤0.260%, 0.62%≤Si≤1.30%, 0.25%≤Mn≤0.35%, 0.010%≤P≤0.030%, 0.010%≤S≤0.030%, 1.10%≤Cr≤1.50%, trace≤B≤0.0018%, 0.012%≤Cu≤0.030%, surplus are iron and inevitable impurity;
Bar material after b, process casting is done cleanup acid treatment; According to the wire diameter requirement of bolt, it is taken out line, so that described bar material is retracted to the required wire diameter of bolt; The bar material that shrinks after wire diameter is cut to the required length of bolt, and the bar material after cutting off is at normal temperatures put into the mold cavity that is coated with plant ash, makes the required head of bar material formation bolt and bar section size with upset force; Utilize precision lathe at the periphery turning formation screw thread of bar material bar section, the cutter on lathe is Sintox, and the workpiece velocity of rotation guarantees at 3050-3150r.P.M, and begins feed by the relative end of disc head portions, cutting fluid employing water-base cutting fluid;
C, thermal treatment
with the bolt outside screw of precision lathe turning moulding under 740 ℃ ± 10 ℃, quench with quenching oil, bolt after quenching again carries out tempering under 500 ℃, time length 80-100 minute, with the polished rod section of bolt under 800 ℃ ± 20 ℃, the use hardening liquid quenches, bolt after quenching again carries out tempering under 550 ℃, time length 60-70 minute, carry out at last carburizing treatment, carburizing agent is sent in tempering stove, carburizing treatment 80～120min in 1100～1150 ℃ of temperature ranges, described carburizing agent is with potassium felspar sand fine powder 35～50Wt%, granular graphite 15～30Wt% and carbonate or/and supercarbonate 35～50Wt% obtain after mixing,
D, sub-zero treatment: bolt after thermal treatment is packed into to remain to be had in the container of liquid nitrogen, and liquid nitrogen concentration 〉=99.9% carries out sub-zero treatment, and the time is 11-12 hour;
E, Passivation Treatment, it is to process 5-6min in the inactivating treatment liquid of 100-120 ℃ that bolt after sub-zero treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 4～6 parts of water-soluble molybdates, 10～12 parts of urotropines, 80～100 parts of alkaline silica sols, 80～100 parts of water soluble acrylic resins, 80-100 part water;
F, bonderizing are put into 60-80 ℃ of etching solution with the bolt after Passivation Treatment and are soaked 3-5min;
G, chromising process, and the bolt after bonderizing is put into the wetting ferrochrome powder of 25% hydrochloric acid soln heat, and are heated to 700-800 ℃, keep 60-70min, then clean, air-dry, bolt gets product.
2. the preparation method of anti-fracture wire bolt according to claim 1 is characterized in that: described bonderizing, and the bolt after Passivation Treatment is put into 70 ℃ of etching solutions soak 4min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100421542A CN103131954A (en) | 2013-02-04 | 2013-02-04 | Preparation method of fracture-resistant steel rope bolt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100421542A CN103131954A (en) | 2013-02-04 | 2013-02-04 | Preparation method of fracture-resistant steel rope bolt |
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| CN103131954A true CN103131954A (en) | 2013-06-05 |
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| CN2013100421542A Pending CN103131954A (en) | 2013-02-04 | 2013-02-04 | Preparation method of fracture-resistant steel rope bolt |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222574A (en) * | 2016-08-24 | 2016-12-14 | 宁波乾豪金属制品有限公司 | A kind of corrosion resistant spring suspension |
| CN109321717A (en) * | 2018-11-30 | 2019-02-12 | 重庆铁源紧固件制造有限公司 | A kind of fastener manufacturing method |
| CN110139947A (en) * | 2017-01-05 | 2019-08-16 | 杰富意钢铁株式会社 | High strength cold rolled steel plate |
| CN113182620A (en) * | 2021-04-15 | 2021-07-30 | 南通德元机械制造有限公司 | Optimization method for helical milling cut-in trajectory of cylindrical external thread |
Citations (5)
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|---|---|---|---|---|
| US4442562A (en) * | 1982-05-07 | 1984-04-17 | Russo Peter J | Method of forming anchor bolts |
| CN101169150A (en) * | 2007-11-29 | 2008-04-30 | 贵州航天新力铸锻有限责任公司 | Million - kilowatts class nuclear power station reactor main bolt production process |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN102319990A (en) * | 2011-09-30 | 2012-01-18 | 山推工程机械股份有限公司 | Manufacturing process of low-carbon high-strength bolt for track |
| JP2012162798A (en) * | 2011-01-18 | 2012-08-30 | Kobe Steel Ltd | Boron-containing steel for high strength bolt, excellent in delayed fracture resistance, and high-strength bolt |
-
2013
- 2013-02-04 CN CN2013100421542A patent/CN103131954A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442562A (en) * | 1982-05-07 | 1984-04-17 | Russo Peter J | Method of forming anchor bolts |
| CN101169150A (en) * | 2007-11-29 | 2008-04-30 | 贵州航天新力铸锻有限责任公司 | Million - kilowatts class nuclear power station reactor main bolt production process |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| JP2012162798A (en) * | 2011-01-18 | 2012-08-30 | Kobe Steel Ltd | Boron-containing steel for high strength bolt, excellent in delayed fracture resistance, and high-strength bolt |
| CN102319990A (en) * | 2011-09-30 | 2012-01-18 | 山推工程机械股份有限公司 | Manufacturing process of low-carbon high-strength bolt for track |
Non-Patent Citations (1)
| Title |
|---|
| 王涛 等: "螺栓热处理淬火介质的选用及常见问题处理", 《第十次全国热处理大会论文集》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222574A (en) * | 2016-08-24 | 2016-12-14 | 宁波乾豪金属制品有限公司 | A kind of corrosion resistant spring suspension |
| CN110139947A (en) * | 2017-01-05 | 2019-08-16 | 杰富意钢铁株式会社 | High strength cold rolled steel plate |
| CN110139947B (en) * | 2017-01-05 | 2021-07-13 | 杰富意钢铁株式会社 | High-strength cold-rolled steel sheet |
| CN109321717A (en) * | 2018-11-30 | 2019-02-12 | 重庆铁源紧固件制造有限公司 | A kind of fastener manufacturing method |
| CN113182620A (en) * | 2021-04-15 | 2021-07-30 | 南通德元机械制造有限公司 | Optimization method for helical milling cut-in trajectory of cylindrical external thread |
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Application publication date: 20130605 |