CN103084532A - Method for machining T-shaped bolt - Google Patents
Method for machining T-shaped bolt Download PDFInfo
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- CN103084532A CN103084532A CN2012105118496A CN201210511849A CN103084532A CN 103084532 A CN103084532 A CN 103084532A CN 2012105118496 A CN2012105118496 A CN 2012105118496A CN 201210511849 A CN201210511849 A CN 201210511849A CN 103084532 A CN103084532 A CN 103084532A
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Abstract
The invention discloses a method for machining a T-shaped bolt. The method comprises the following steps of: a) casting a T-shaped rod material blank and controlling the weight percentage of all chemical components of the rod material blank to ensure that the rod material blank comprises 0.28 to 0.35 percent of C, 0.25 to 0.35 percent of Mn, 0.05 to 0.09 percent of V, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, less than or equal to 0.025 percent of P, less than or equal to 0.035 percent of S, 0.55 to 1.20 percent of Ni, 0.35 to 0.45 percent of Co, 0.20 to 0.30 percent of Sb and less than or equal to 0.20 percent of Cu; according to the method for machining the T-shaped bolt, the bolt is machined by a cold extruding process, so that the intensity of the bolt is improved, the hardness value and the intensity value required by a 12.9 high-intensity bolt can be acquired, and the delayed fracture and the fatigue crack of the bolt under high intensity can be avoided; and during use, the bolt is reliable in connection, is not prone to break, and meets the using requirements of all industries in society on the high-intensity bolt; and the service life of the bolt is prolonged.
Description
Technical field
The present invention relates to the processing method of bolt, especially a kind of tommyhead bolt processing 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.
Summary of the invention
The object of the invention is to avoid weak point of the prior art, and a kind of tommyhead bolt processing method is provided.
Purpose of the present invention is as follows by the following technical programs:
The tommyhead bolt processing method, procedure of processing comprises:
A, casting T shape bar material blank, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.28～0.35, Mn 0.25～0.35, V 0.05-0.09, Si 0.15～0.35, W 0.01-0.04, P≤0.025, S≤0.035, Ni 0.55～1.20, Co 0.35～0.45, Sb 0.20～0.30, Cu≤0.20;
B, the T shape bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 750-800 ℃, forging covering thin layer trees ash on the impression inwall of mould, the granularity of trees ash 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 10-12 hour under 450-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 10 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then take out from tempering furnace put into 300-320 ℃ tempering oil with oily slow cooling; That bolt head with bolt is under 800 ℃ ± 20 ℃ for the second time, the use quenching liquid quenches, bolt after quenching again carries out tempering under 600 ℃, 60 minutes duration, carry out at last Carburization Treatment, carburizer is sent in tempering furnace Carburization Treatment 50～120min in 1100 °～1150 ℃ temperature ranges;
D, phosphatization are processed, and at first carry out ungrease treatment with 14% sodium hydroxide solution washing, and temperature is controlled between 55-60 ℃, and the time is 5-6 minute, then washing; Use again 15%NaHSO
4Solution washing carries out pickling processes, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; At last in 40 ℃ of situations of temperature, the concentration that adopts volume ratio to be respectively 1:2:1:3:50 is in the surfactant solution of 26% HCl, 200ml/l, sodium acid carbonate 3～5g/l, sodium nitrate 0.3～0.4g/l, hydrogen peroxide 0.6～1g/l and water preparation, temperature is controlled at 45-47 ℃, the immersion time is 2 minutes, cleans up afterwards;
E, blackening process
Bolt is carried out blackening process, control 100 ℃-110 ℃ of temperature; Time 25-30 minute; Clean again, air-dry, bolt gets product.
Tommyhead bolt processing method of the present invention, the processing of employing header 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 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 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 tommyhead bolt processing method, procedure of processing comprises:
A, casting T shape bar material blank, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.28～0.35, Mn 0.25～0.35, V 0.05-0.09, Si 0.15～0.35, W 0.01-0.04, P≤0.025, S≤0.035, Ni 0.55～1.20, Co 0.35～0.45, Sb 0.20～0.30, Cu≤0.20;
B, the T shape bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 750-800 ℃, forging covering thin layer trees ash on the impression inwall of mould, the granularity of trees ash 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 10-12 hour under 450-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 10 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then take out from tempering furnace put into 300-320 ℃ tempering oil with oily slow cooling; That bolt head with bolt is under 800 ℃ ± 20 ℃ for the second time, the use quenching liquid quenches, bolt after quenching again carries out tempering under 600 ℃, 60 minutes duration, carry out at last Carburization Treatment, carburizer is sent in tempering furnace Carburization Treatment 50～120min in 1100 °～1150 ℃ temperature ranges;
D, phosphatization are processed, and at first carry out ungrease treatment with 14% sodium hydroxide solution washing, and temperature is controlled between 55-60 ℃, and the time is 5-6 minute, then washing; Use again 15%NaHSO
4Solution washing carries out pickling processes, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; At last in 40 ℃ of situations of temperature, the concentration that adopts volume ratio to be respectively 1:2:1:3:50 is in the surfactant solution of 26% HCl, 200ml/l, sodium acid carbonate 3～5g/l, sodium nitrate 0.3～0.4g/l, hydrogen peroxide 0.6～1g/l and water preparation, temperature is controlled at 45-47 ℃, the immersion time is 2 minutes, cleans up afterwards;
E, blackening process
Bolt is carried out blackening process, control 110 ℃ of temperature; 28 minutes time; Clean again, air-dry, bolt gets product.
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 50-55HRC, bolt thread section hardness reaches 51-53HRC, tensile strength reaches 1260Mpa, yield strength reaches 1220Mpa, percentage elongation is greater than 12%, and the contraction percentage of area is greater than 35%, 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 (1)
1.T shape bolt processing method is characterized in that, procedure of processing comprises:
A, casting T shape bar material blank, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.28～0.35, Mn 0.25～0.35, V 0.05-0.09, Si 0.15～0.35, W 0.01-0.04, P≤0.025, S≤0.035, Ni 0.55～1.20, Co 0.35～0.45, Sb 0.20～0.30, Cu≤0.20;
B, the T shape bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 750-800 ℃, forging covering thin layer trees ash on the impression inwall of mould, the granularity of trees ash 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 10-12 hour under 450-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 10 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then take out from tempering furnace put into 250-270 ℃ tempering oil with oily slow cooling; That bolt head with bolt is under 800 ℃ ± 20 ℃ for the second time, the use quenching liquid quenches, bolt after quenching again carries out tempering under 600 ℃, 60 minutes duration, carry out at last Carburization Treatment, carburizer is sent in tempering furnace Carburization Treatment 50～120min in 1100 °～1150 ℃ temperature ranges;
D, phosphatization are processed, and at first carry out ungrease treatment with 14% sodium hydroxide solution washing, and temperature is controlled between 55-60 ℃, and the time is 5-6 minute, then washing; Use again 15%NaHSO
4Solution washing carries out pickling processes, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; At last in 40 ℃ of situations of temperature, the concentration that adopts volume ratio to be respectively 1:2:1:3:50 is in the surfactant solution of 26% HCl, sodium acid carbonate 3～5g/l, sodium nitrate 0.3～0.4g/l, hydrogen peroxide 0.6～1g/l and water preparation, temperature is controlled at 45-47 ℃, the immersion time is 2 minutes, cleans up afterwards;
E, blackening process
Bolt is carried out blackening process, control 100 ℃-110 ℃ of temperature; Time 25-30 minute; Clean again, air-dry, bolt gets product.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210511849.6A CN103084532B (en) | 2012-12-04 | 2012-12-04 | Method for machining T-shaped bolt |
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| CN201210511849.6A CN103084532B (en) | 2012-12-04 | 2012-12-04 | Method for machining T-shaped bolt |
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| CN103084532A true CN103084532A (en) | 2013-05-08 |
| CN103084532B CN103084532B (en) | 2015-05-06 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231217A (en) * | 2013-05-10 | 2013-08-07 | 江苏永昊高强度螺栓有限公司 | Production method of bolts |
| CN103966600A (en) * | 2014-05-07 | 2014-08-06 | 喜科金属（昆山）有限公司 | Closed type automatic pretreatment flow line production process |
| CN105308202A (en) * | 2013-06-13 | 2016-02-03 | 新日铁住金株式会社 | Wire rod for manufacture of steel wire for pearlite structure bolt having tensile strength of 950-1600 mpa, steel wire for pearlite structure bolt having tensile strength of 950-1600 mpa, pearlite structure bolt, and methods for manufacturing same |
| CN105420609A (en) * | 2015-11-03 | 2016-03-23 | 合肥海源机械有限公司 | Preparation method of anti-fracture engine crankshaft |
| CN105420588A (en) * | 2015-11-03 | 2016-03-23 | 合肥海源机械有限公司 | Preparation method of automobile hub fixed bolt |
| CN105798535A (en) * | 2016-05-18 | 2016-07-27 | 安徽合矿机械股份有限公司 | Steel deck manufacturing process |
| CN107447221A (en) * | 2017-07-25 | 2017-12-08 | 柳州金特新型耐磨材料股份有限公司 | The heat treatment method of connecting-rod bolts |
| 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 |
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| US20020179207A1 (en) * | 2000-04-07 | 2002-12-05 | Seiichi Koike | Method for manufacturing high strength bolt excellent in resistance to delayed fracture and to relaxation |
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| US20020179207A1 (en) * | 2000-04-07 | 2002-12-05 | Seiichi Koike | Method for manufacturing high strength bolt excellent in resistance to delayed fracture and to relaxation |
| CN101549448A (en) * | 2008-03-31 | 2009-10-07 | 江都狮鹤高强度螺栓有限公司 | Processing technology for high-strength bolt used for steel net frame bolt ball node |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231217A (en) * | 2013-05-10 | 2013-08-07 | 江苏永昊高强度螺栓有限公司 | Production method of bolts |
| CN105308202A (en) * | 2013-06-13 | 2016-02-03 | 新日铁住金株式会社 | Wire rod for manufacture of steel wire for pearlite structure bolt having tensile strength of 950-1600 mpa, steel wire for pearlite structure bolt having tensile strength of 950-1600 mpa, pearlite structure bolt, and methods for manufacturing same |
| CN105308202B (en) * | 2013-06-13 | 2017-04-26 | 新日铁住金株式会社 | Wire rod for manufacture of steel wire for pearlite structure bolt having tensile strength of 950-1600 mpa, steel wire for pearlite structure bolt having tensile strength of 950-1600 mpa, pearlite structure bolt, and methods for manufacturing same |
| CN103966600A (en) * | 2014-05-07 | 2014-08-06 | 喜科金属（昆山）有限公司 | Closed type automatic pretreatment flow line production process |
| CN103966600B (en) * | 2014-05-07 | 2016-08-03 | 喜科金属（昆山）有限公司 | A kind of closed automatic pre-treatment production line balance technique |
| CN105420609A (en) * | 2015-11-03 | 2016-03-23 | 合肥海源机械有限公司 | Preparation method of anti-fracture engine crankshaft |
| CN105420588A (en) * | 2015-11-03 | 2016-03-23 | 合肥海源机械有限公司 | Preparation method of automobile hub fixed bolt |
| CN105798535A (en) * | 2016-05-18 | 2016-07-27 | 安徽合矿机械股份有限公司 | Steel deck manufacturing process |
| CN107447221A (en) * | 2017-07-25 | 2017-12-08 | 柳州金特新型耐磨材料股份有限公司 | The heat treatment method of connecting-rod bolts |
| 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 |
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