CN103084798A - Method for forging high-strength bolt - Google Patents
Method for forging high-strength bolt Download PDFInfo
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- CN103084798A CN103084798A CN201210511739XA CN201210511739A CN103084798A CN 103084798 A CN103084798 A CN 103084798A CN 201210511739X A CN201210511739X A CN 201210511739XA CN 201210511739 A CN201210511739 A CN 201210511739A CN 103084798 A CN103084798 A CN 103084798A
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- bolt
- percent
- forging
- strength
- temperature
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005242 forging Methods 0.000 title claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 20
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 235000010288 sodium nitrite Nutrition 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 230000002269 spontaneous effect Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 238000005201 scrubbing Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000641 cold extrusion Methods 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910052718 tin Inorganic materials 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000003672 processing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 210000000981 epithelium Anatomy 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention discloses a method for forging a high-strength bolt. The method comprises the following steps of: a, manufacturing a rod blank through a casting process, and controlling the weight percentage of each chemical component of the rod blank to meet the following requirements: 0.28 to 0.35 percent of C, 0.15 to 0.25 percent of Mn, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, more than or equal to 0.015 and less than or equal to 0.025 percent of P, more than or equal to 0.015 and less than or equal to 0.035 percent of S, 0.15 to 0.20 percent of Ni, 0.025 to 0.045 percent of Ba, 0.02 to 0.03 percent of Sn, less than or equal to 0.02 percent of Mg and the balance of iron; and b, forging a cast rod at the temperature of between 630 and 680 DEG C for not more than 25 times, wherein a thin layer of graphite powder is coated on the inner wall of an impression of a forging die, and the granularity of the graphite powder is controlled to be 200 to 300 meshes; and turning an external thread of the bolt by using a precision lathe after forging. According to the method for forging the high-strength bolt, the bolt is machined by adopting a cold extrusion process, so that the strength of the bolt is improved, the hardness value and the strength value required by the 12.9 high-strength bolt are achieved, the problems of delayed fracture and fatigue fracture of the bolt under high strength are solved, the bolt is reliable in connection during use and difficult to break, the service life of the bolt is prolonged, and the using requirement of each industry in the society for the high-strength bolt is met.
Description
Technical field
The present invention relates to the processing method of bolt, especially a kind of high-strength bolt forging method.
Background technology
High-strength bolt is securing member 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 important function.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 processing method of high-strength bolt, produce more high-intensity 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 high-strength bolt forging method is provided.
Purpose of the present invention is as follows by the following technical programs:
The high-strength bolt forging method, procedure of processing comprises:
A, make bar material blank by casting technique, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.25～0.35, Mn 0.15～0.25, Si 0.15～0.35, W 0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni 0.15～0.20, Ba 0.025～0.045, Sn 0.02～0.03, Mg≤0.02, and surplus is iron;
B, the bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 630-680 ℃, forging covering thin layer graphite powder on the impression inwall of mould, the granularity of graphite powder is controlled to be the 200-300 order, forge number of times no more than 25 times, utilize fine turning lathe turning to go out the bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning was heated 8-9 hour under 460-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 20 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then takes out from tempering furnace and put into 250-270 ℃ of No. 200 solvent naphthas with oily slow cooling; Be for the second time the body of rod with bolt under 800 ℃ ± 20 ℃, the use quenching liquid quenches, then the bolt after quenching carries out tempering, 60 minutes duration under 600 ℃;
D, phosphatization are processed, and at first carry out ungrease treatment with 17% ammonia scrubbing, and temperature is controlled between 45-60 ℃, and the time is 6-7 minute, then washing; Carry out pickling processes with 25% hydrochloric acid solution washing again, temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in phosphate solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3-5 minute, cleans up afterwards;
E, blackening process, be under the condition of 120～130 ℃ in temperature, bolt is placed in to process in sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 15～20min, more fully clean, obtain the finished product bolt after air-dry with water.
Described blackening process is under temperature is the condition of 125 ℃, bolt is placed in to process in the 5-8% sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from the 5-8% sodium nitrite solution, and spontaneous curing 18min, more fully clean, obtain the finished product bolt after air-dry with water.
High-strength bolt forging method of the present invention, adopt the processing of cold-extrusion technology bolt, improved the intensity of bolt, reached required hardness number, the intensity level of high-strength bolt, solved delayed fracture and the fatigue fracture of bolt under 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 processing technology of material, make wire rod hardness moderate, the surface has good phosphatization epithelium, greasy property is good, wire rod is without hydrogen embrittlement, plasticity is good;
2, bolt of the present invention has carried out repeatedly cold-forge forming, has improved the bolt bulk strength, high-intensity performance, 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 Technology for Heating Processing 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.
The specific embodiment
The invention will be further described with the following Examples:
The high-strength bolt forging method, procedure of processing comprises:
A, make bar material blank by casting technique, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.25～0.35, Mn 0.15～0.25, Si 0.15～0.35, W 0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni 0.15～0.20, Ba 0.025～0.045, Sn 0.02～0.03, Mg≤0.02, and surplus is iron;
B, the bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 630-680 ℃, forging covering thin layer graphite powder on the impression inwall of mould, the granularity of graphite powder is controlled to be the 200-300 order, forge number of times no more than 25 times, utilize fine turning lathe turning to go out the bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning was heated 8-9 hour under 460-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 20 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then takes out from tempering furnace and put into 250-270 ℃ of No. 200 solvent naphthas with oily slow cooling; Be for the second time the body of rod with bolt under 800 ℃ ± 20 ℃, the use quenching liquid quenches, then the bolt after quenching carries out tempering, 60 minutes duration under 600 ℃;
D, phosphatization are processed, and at first carry out ungrease treatment with 17% ammonia scrubbing, and temperature is controlled between 45-60 ℃, and the time is 6-7 minute, then washing; Carry out pickling processes with 25% hydrochloric acid solution washing again, temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in phosphate solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3-5 minute, cleans up afterwards;
E, blackening process are under temperature is the condition of 125 ℃, bolt is placed in to process in the 5-8% sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from the 5-8% sodium nitrite solution, and spontaneous curing 18min, more fully clean, obtain the finished product bolt after air-dry with water.
The bolt of producing according to the preparation method of bolt of the present invention, as follows through detecting its mechanical performance numerical value of test, the bolt centre hardness reaches 50-52HRC, bolt thread section hardness reaches 46-50HRC, tensile strength reaches 1260Mpa, yield strength reaches 1220Mpa, percentage elongation is greater than 12%, and the contraction percentage of area is greater than 37%, and impact flexibility is greater than 45J/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 high-strength bolt forging method, is characterized in that, procedure of processing comprises:
A, make bar material blank by casting technique, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.25～0.35, Mn 0.15～0.25, Si 0.15～0.35, W 0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni 0.15～0.20, Ba 0.025～0.045, Sn 0.02～0.03, Mg≤0.02, and surplus is iron;
B, the bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 630-680 ℃, forging covering thin layer graphite powder on the impression inwall of mould, the granularity of graphite powder is controlled to be the 200-300 order, forge number of times no more than 25 times, utilize fine turning lathe turning to go out the bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning was heated 8-9 hour under 460-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 20 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then takes out from tempering furnace and put into 250-270 ℃ of No. 200 solvent naphthas with oily slow cooling; Be for the second time the body of rod with bolt under 800 ℃ ± 20 ℃, the use quenching liquid quenches, then the bolt after quenching carries out tempering, 60 minutes duration under 600 ℃;
D, phosphatization are processed, and at first carry out ungrease treatment with 17% ammonia scrubbing, and temperature is controlled between 45-60 ℃, and the time is 6-7 minute, then washing; Carry out pickling processes with 25% hydrochloric acid solution washing again, temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in phosphate solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3-5 minute, cleans up afterwards;
E, blackening process, be under the condition of 120～130 ℃ in temperature, bolt is placed in to process in sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 15～20min, more fully clean, obtain the finished product bolt after air-dry with water.
2. high-strength bolt forging method according to claim 1, it is characterized in that: described blackening process is under temperature is the condition of 125 ℃, bolt is placed in to process in the 5-8% sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from the 5-8% sodium nitrite solution, and spontaneous curing 18min, more fully clean, obtain the finished product bolt after air-dry with water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511739.XA CN103084798B (en) | 2012-12-04 | 2012-12-04 | high-strength bolt forging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511739.XA CN103084798B (en) | 2012-12-04 | 2012-12-04 | high-strength bolt forging method |
Publications (2)
| Publication Number | Publication Date |
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| CN103084798A true CN103084798A (en) | 2013-05-08 |
| CN103084798B CN103084798B (en) | 2016-12-21 |
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| CN201210511739.XA Active CN103084798B (en) | 2012-12-04 | 2012-12-04 | high-strength bolt forging method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586645A (en) * | 2013-11-28 | 2014-02-19 | 郑州水野大一热处理技术有限公司 | Manufacturing process of M72 high-strength bolts |
| CN105296850A (en) * | 2015-11-03 | 2016-02-03 | 合肥海源机械有限公司 | Preparation method of high-temperature-resistant engine crankshaft bearing bush |
| CN105401078A (en) * | 2015-11-03 | 2016-03-16 | 合肥海源机械有限公司 | Method for producing automobile engine rocker shaft |
| CN106567014A (en) * | 2016-11-14 | 2017-04-19 | 安徽名杰净化科技有限公司 | Preparation method of air purifier alloy connecting flange |
| CN110270797A (en) * | 2019-06-27 | 2019-09-24 | 宁波嘉东工具有限公司 | A kind of spring compressor processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0565540A (en) * | 1991-09-10 | 1993-03-19 | Nissan Motor Co Ltd | Manufacture of high strength bolt |
| 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 |
| 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 |
| CN102072234A (en) * | 2010-11-19 | 2011-05-25 | 浙江高强度紧固件有限公司 | Production process of nuclear 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 |
-
2012
- 2012-12-04 CN CN201210511739.XA patent/CN103084798B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0565540A (en) * | 1991-09-10 | 1993-03-19 | Nissan Motor Co Ltd | Manufacture of high strength bolt |
| 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 |
| 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 |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN102072234A (en) * | 2010-11-19 | 2011-05-25 | 浙江高强度紧固件有限公司 | Production process of nuclear 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586645A (en) * | 2013-11-28 | 2014-02-19 | 郑州水野大一热处理技术有限公司 | Manufacturing process of M72 high-strength bolts |
| CN103586645B (en) * | 2013-11-28 | 2016-08-17 | 郑州水野大一热处理技术有限公司 | A kind of production technology of M72 high-strength bolt |
| CN105296850A (en) * | 2015-11-03 | 2016-02-03 | 合肥海源机械有限公司 | Preparation method of high-temperature-resistant engine crankshaft bearing bush |
| CN105401078A (en) * | 2015-11-03 | 2016-03-16 | 合肥海源机械有限公司 | Method for producing automobile engine rocker shaft |
| CN106567014A (en) * | 2016-11-14 | 2017-04-19 | 安徽名杰净化科技有限公司 | Preparation method of air purifier alloy connecting flange |
| CN110270797A (en) * | 2019-06-27 | 2019-09-24 | 宁波嘉东工具有限公司 | A kind of spring compressor processing method |
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| Publication number | Publication date |
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| CN103084798B (en) | 2016-12-21 |
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