CN103212957B - Processing method of high-strength bolts - Google Patents
Processing method of high-strength bolts Download PDFInfo
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- CN103212957B CN103212957B CN201310170947.2A CN201310170947A CN103212957B CN 103212957 B CN103212957 B CN 103212957B CN 201310170947 A CN201310170947 A CN 201310170947A CN 103212957 B CN103212957 B CN 103212957B
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Abstract
This processing method of high-strength bolts, after raw material surface acidifying, Quenching Treatment, lower the temperature step by step process, raw material interior tissue changes, and becomes harder, the martensite that intensity is larger, laser cutting, makes shaped structure accurate, raw tissue destroys little, ridge Quenching Treatment, strengthens the slight of ridge and hardness, improve the bulk strength of bolt, the inventive method, can produce the bolt of high strength, can be applicable to the mechanical field that various high strength connects.
Description
technical field:
The present invention relates to bolt processing method, particularly relate to a kind of processing method of high-strength bolt.
background technology:
Bolt is the securing member that mechanical field is conventional, now along with the fast development of mechanical cause, had very large requirement to the working strength of bolt, such as present high-speed railway, train running speed is faster much than in the past, the point cantact time of train driving to high-speed railway is shorter, point cantact Li Genggao, being connected and fixed of high-speed railway will be more firm, more stable, bonding strength and the hardness of conventional bolt are lower, do not reach the instructions for use of high strength.
summary of the invention:
In order to solve above-mentioned Problems existing, the invention discloses a kind of processing method of high-strength bolts, this bolt processing method, the high-strength bolt that intensity is greater than existing standard can be produced.
Processing method of high-strength bolts, is characterized in that comprising the following steps:
(1) Feedstock treating and shaping
(1) by raw material acid pickling and rust removing,
(2) natural air drying 0.5 hour after raw material pickling,
(3) to the raw material Quenching Treatment after pickling, directly render in the environment of constant temperature 820 ± 20 DEG C, 4.5 ~ 5.5 hours, temperature was lowered the temperature annealing in process step by step, constant temperature 750 DEG C, 650 DEG C, 550 DEG C, 400 DEG C, 300 DEG C, 150 DEG C, normal temperature homogeneous hour cooling processing,
(4) by the removal of impurities of step (3) resulting materials surface acid-washing,
(5) by shaping for the raw material laser cutting after pickling impurity removal, screw rod and nut is formed;
(2) threading
Step (one) gained is placed in thread rolling machine, forms screw thread in screw surface;
(3) heat treatment
(1) bolt that step (two) is formed is carried out 980 DEG C of Quenching Treatment, constant temperature 980 DEG C, 0.5 hour,
(2) by the bolt after Quenching Treatment, tempering of lowering the temperature step by step, 800 DEG C, 600 DEG C, 400 DEG C, 200 DEG C of constant temperature 70 minutes;
(4) surface carbonation process
To bolt 800 ~ 850 DEG C of direct quenchings in carbonization environment of step (three) gained, lonneal.
Described raw material is 40 boron steels, 20 manganese titanium boron steels, 35CrMoA.
Described pickling acid used is mass fraction 25%.
The present invention, adopt quenching technical, the arrangement of feed change internal junction crystal, greatly improves the hardness of raw material, intensity, wearability, fatigue strength and toughness, is applied to high-speed railway, and intensity can reach requirement, is also applicable to the field that other high strength requires.
Detailed description of the invention
Below in conjunction with detailed description of the invention, illustrate the present invention further.
This processing method of high-strength bolts, is characterized in that comprising the following steps:
(1) Feedstock treating and shaping
(1) by raw material acid pickling and rust removing,
(2) natural air drying 0.5 hour after raw material pickling,
(3) to the raw material Quenching Treatment after pickling, directly render in the environment of constant temperature 820 ± 20 DEG C, 4.5 ~ 5.5 hours, temperature was lowered the temperature annealing in process step by step, constant temperature 750 DEG C, 650 DEG C, 550 DEG C, 400 DEG C, 300 DEG C, 150 DEG C, normal temperature homogeneous hour cooling processing,
(4) by the removal of impurities of step (3) resulting materials surface acid-washing,
(5) by shaping for the raw material laser cutting after pickling impurity removal, screw rod and nut is formed;
(2) threading
Step (one) gained is placed in thread rolling machine, forms screw thread in screw surface;
(3) heat treatment
(1) bolt that step (two) is formed is carried out 980 DEG C of Quenching Treatment, constant temperature 980 DEG C, 0.5 hour,
(2) by the bolt after Quenching Treatment, tempering of lowering the temperature step by step, 800 DEG C, 600 DEG C, 400 DEG C, 200 DEG C of constant temperature 70 minutes;
(4) surface carbonation process
To bolt 800 ~ 850 DEG C of direct quenchings in carbonization environment of step (three) gained, lonneal.
Described raw material is 40 boron steels, 20 manganese titanium boron steels, 35CrMoA.
Described pickling acid used is mass fraction 25%.
The iron rust on raw material surface is removed in pickling, iron rust is unavailable material, cover raw material surface, affect the postorder process of raw material, hydrochloric acid and iron rust generation chemical reaction, iron rust is dissolved in hydrochloric acid, the hydrochloric acid of mass fraction 25%, after raw material surface clean, natural air drying is after 0.5 hour, hydrochloric acid can, from the volatilization of raw material surface, avoid acid residual.
Quenching can make the capable martensite of overcooling austenite or bainite transformation, obtain martensite or bainite structure, then the tempering with different temperatures is coordinated, significantly to improve the intensity of steel, hardness, wearability, fatigue strength and toughness etc., thus meet the different instructions for uses of various machine components and instrument.
The tempering step by step of the quench hot in Feedstock treating stage and temperature, is conducive to the change of raw material interior tissue, forms stable martensite; The quench hot of heat treatment stages, mainly bolt cadre and head interior tissue change again, and according to the molding structure in bolt head and bar portion, raw material mix tissue change, is formed centrally center intensity line in bolt shank; Surface treatment stage Quenching Treatment, increase within the scope of thread surface and surperficial following certain distance carbon content, also strengthen intensity and the hardness of ridge.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned technological means, also comprises the technical scheme be made up of above technical characteristic.
Claims (3)
1. processing method of high-strength bolts, is characterized in that comprising the following steps:
(1) Feedstock treating and shaping;
1) by raw material acid pickling and rust removing,
2) natural air drying 0.5 hour after raw material pickling,
3) to the raw material Quenching Treatment after pickling, directly render in the environment of constant temperature 820 ± 20 DEG C, 4.5 ~ 5.5 hours, temperature was lowered the temperature annealing in process step by step, constant temperature 750 DEG C, 650 DEG C, 550 DEG C, 400 DEG C, 300 DEG C, 150 DEG C, normal temperature, homogeneous at each temperature hour cooling processing
4) by the removal of impurities of step 3) resulting materials surface acid-washing,
5) by shaping for the raw material laser cutting after pickling impurity removal, screw rod and nut is formed;
(2) threading;
1) step (one) gained is placed in thread rolling machine, forms screw thread in screw surface;
(3) heat treatment;
1) bolt that step (two) is formed is carried out 980 DEG C of Quenching Treatment, constant temperature 980 DEG C, 0.5 hour,
2) by the bolt after Quenching Treatment, tempering of lowering the temperature step by step, 800 DEG C, 600 DEG C, 400 DEG C, 200 DEG C, equal at each temperature constant temperature 70 minutes;
(4) surface carbonation process;
1) to bolt 800 ~ 850 DEG C of direct quenchings in carbonization environment of step (three) gained, lonneal.
2. processing method of high-strength bolts according to claim 1, is characterized in that described raw material is the one in 40 boron steels, 20 manganese titanium boron steels or 35CrMoA.
3. processing method of high-strength bolts according to claim 1, is characterized in that described pickling acid used is mass fraction 25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310170947.2A CN103212957B (en) | 2013-05-10 | 2013-05-10 | Processing method of high-strength bolts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310170947.2A CN103212957B (en) | 2013-05-10 | 2013-05-10 | Processing method of high-strength bolts |
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| Publication Number | Publication Date |
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| CN103212957A CN103212957A (en) | 2013-07-24 |
| CN103212957B true CN103212957B (en) | 2016-02-03 |
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| CN201310170947.2A Active CN103212957B (en) | 2013-05-10 | 2013-05-10 | Processing method of high-strength bolts |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118331A (en) * | 2016-11-30 | 2018-06-05 | 杭州巨星工具有限公司 | A kind of manufacturing method of screwdriver bit and screwdriver bit |
| CN107586935A (en) * | 2017-10-30 | 2018-01-16 | 四川圣亚凯紧固器材有限公司 | The heat treatment method of screw |
| CN108145385A (en) * | 2017-12-27 | 2018-06-12 | 鞍钢重型机械有限责任公司 | A kind of manufacturing method of high-intensity and high-tenacity bolt |
| CN109719470A (en) * | 2019-03-07 | 2019-05-07 | 嘉兴斯迈欧五金科技有限公司 | A kind of production technology of high-strength fastening bolt |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1255417A (en) * | 1999-11-30 | 2000-06-07 | 沈阳工业大学 | Technology for manufacturing fully-threaded bright and high-strength very long screw bolt |
| CN1443946A (en) * | 2003-04-17 | 2003-09-24 | 南京汽车集团有限公司 | Production process of high strength bolt with above 1300MPa |
| KR20090034112A (en) * | 2007-10-02 | 2009-04-07 | 주식회사 삼진금속 | Manufacturing method of coupling bolt for gas turbine |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN103088268A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Preparation method of fastening bolt for automobile wheel |
-
2013
- 2013-05-10 CN CN201310170947.2A patent/CN103212957B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1255417A (en) * | 1999-11-30 | 2000-06-07 | 沈阳工业大学 | Technology for manufacturing fully-threaded bright and high-strength very long screw bolt |
| CN1443946A (en) * | 2003-04-17 | 2003-09-24 | 南京汽车集团有限公司 | Production process of high strength bolt with above 1300MPa |
| KR20090034112A (en) * | 2007-10-02 | 2009-04-07 | 주식회사 삼진금속 | Manufacturing method of coupling bolt for gas turbine |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN103088268A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Preparation method of fastening bolt for automobile wheel |
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| CN103212957A (en) | 2013-07-24 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Processing method of high-strength bolts Effective date of registration: 20191226 Granted publication date: 20160203 Pledgee: Bank of Jiangsu Co., Ltd. Jingjiang sub branch Pledgor: Jiangsu Yonghao High Strength Bolt Co., Ltd. Registration number: Y2019320000402 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210723 Granted publication date: 20160203 Pledgee: Bank of Jiangsu Co.,Ltd. Jingjiang sub branch Pledgor: JIANGSU YONGHAO HIGH-STRENGTH BOLT Co.,Ltd. Registration number: Y2019320000402 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |