CN103088266A - Forging method for foundation bolt - Google Patents
Forging method for foundation bolt Download PDFInfo
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- CN103088266A CN103088266A CN2012105118208A CN201210511820A CN103088266A CN 103088266 A CN103088266 A CN 103088266A CN 2012105118208 A CN2012105118208 A CN 2012105118208A CN 201210511820 A CN201210511820 A CN 201210511820A CN 103088266 A CN103088266 A CN 103088266A
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Abstract
The invention discloses a forging method for a foundation bolt. The forging method comprises the following forging steps of: a, preparing rod blanks by a forging process, controlling the chemical components of the rod blanks to satisfy the following requirements in percentage by weight: 0.25%-0.35% of C, 0.15%-0.25% of Mn, 0.15%-0.35% of Si, 0.01%-0.04% of W, P being not less than 0.015% and not more than 0.025%, S being not less than 0.015% and not more than 0.035%, 0.15%-0.20% of Ni, 0.025%-0.045% of Zn, 0.02%-0.03% of Sn, not more than 0.02% o Cr, and the balance of iron. According to the forging method for the foundation bolt disclosed by the invention, the bolt is machined by adopting a cold extrusion process, the strength of the bolt is improved, the needed hardness value and strength value of the 12.9 high-strength bolt are achieved, and delayed fracture and fatigue fracture of the high-strength bolt are solved; and moreover, during the using process, the foundation bolt is reliable in connection and not easy to break, so that the service life of the bolt is prolonged, and the using needs of the high-strength bolt in various industries of the society are satisfied.
Description
Technical field
The present invention relates to the working method of bolt, especially a kind of forging method of wall screw.
Background technology
Wall screw 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 wall screw 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 working method of wall screw, produce the wall screw more corrosion-resistant, that intensity is higher.
Summary of the invention
The object of the invention is to avoid weak point of the prior art, and a kind of forging method of wall screw is provided.
Purpose of the present invention is as follows by the following technical programs:
The forging method of wall screw, procedure of processing comprises:
A, make bar material blank by casting technique, the weight percent 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, Zn 0.025～0.045, Sn 0.02～0.03, Cr≤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 600-650 ℃, forging covering thin layer plant ash on the impression inwall of mould, the granularity of plant ash is controlled to be the 200-300 order, forge number of times no more than 25 times, forge that two dental laminas by reciprocating type tooth roller push the bar material after moulding, by reciprocal action, screw thread is rolled over the type of making, form the outside screw of bolt;
C, thermal treatment, bolt is put into vacuum heat treatment furnace, when being warming up to 450 ± 10 ℃ with stove, the insulation 1-2 hour, when being warming up to 700 ± 10 ℃ with stove, the insulation 40-50 minute, when being warming up to 800-900 ℃ with stove, the insulation 4-5 hour, then the quenching of coming out of the stove, put into again stove after quenching, when being warming up to 550-650 ± 10 ℃ with stove, insulation 6-8 hour, the use of coming out of the stove again hardening liquid is cooling, put into again stove after cooling, when being warming up to 550-650 ℃ with stove, insulation 5-6 hour, then the water-cooled of coming out of the stove;
D, the bolt after thermal treatment is carried out sub-zero treatment, liquid nitrogen temperature is-125～-150 ℃, and the time of sub-zero treatment is 2-5 hour, and the isothermal time in liquid nitrogen is: the cross-sectional area of bolt multiply by 2～3min/mm
2, the bolt that after sub-zero treatment, temperature has been gone back up to room temperature is put into boiling water heating 60-80 minute of 100 ℃;
At first e, bonderizing carry out skimming 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 55%KHSO
4Solution washing carries out cleanup acid treatment, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in Sodium dodecylbenzene sulfonate solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3 minutes, cleans up afterwards;
F, 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 sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 18min, more fully clean, obtain the finished product bolt after air-dry with water.
The forging method of wall screw of the present invention, adopt the processing of cold-extrusion technology bolt, improved the intensity of bolt, delayed fracture and the repeated stress failure of wall screw have been solved, in use connect reliable, frangibility, do not improved bolt life, satisfied social upper every profession and trade to the user demand of wall screw.
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 thermal treatment, has improved the wall screw bulk strength, and the bolt precision is high, quality is good, and production efficiency is high, without cutting without waste material, unit cost descends greatly, has obtained bulk metal and has flowed to the consistent bolt of direction, has 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 forging method of wall screw, procedure of processing comprises:
A, make bar material blank by casting technique, the weight percent 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, Zn 0.025～0.045, Sn 0.02～0.03, Cr≤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 600-650 ℃, forging covering thin layer plant ash on the impression inwall of mould, the granularity of plant ash is controlled to be the 200-300 order, forge number of times no more than 25 times, forge that two dental laminas by reciprocating type tooth roller push the bar material after moulding, by reciprocal action, screw thread is rolled over the type of making, form the outside screw of bolt;
C, thermal treatment, bolt is put into vacuum heat treatment furnace, when being warming up to 450 ± 10 ℃ with stove, the insulation 1-2 hour, when being warming up to 700 ± 10 ℃ with stove, the insulation 40-50 minute, when being warming up to 800-900 ℃ with stove, the insulation 4-5 hour, then the quenching of coming out of the stove, put into again stove after quenching, when being warming up to 550-650 ± 10 ℃ with stove, insulation 6-8 hour, the use of coming out of the stove again hardening liquid is cooling, put into again stove after cooling, when being warming up to 550-650 ℃ with stove, insulation 5-6 hour, then the water-cooled of coming out of the stove;
D, the bolt after thermal treatment is carried out sub-zero treatment, liquid nitrogen temperature is-125～-150 ℃, and the time of sub-zero treatment is 2-5 hour, and the isothermal time in liquid nitrogen is: the cross-sectional area of bolt multiply by 2～3min/mm
2, the bolt that after sub-zero treatment, temperature has been gone back up to room temperature is put into boiling water heating 60-80 minute of 100 ℃;
At first e, bonderizing carry out skimming 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 55%KHSO
4Solution washing carries out cleanup acid treatment, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in Sodium dodecylbenzene sulfonate solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3 minutes, cleans up afterwards;
F, blackening process are under temperature is the condition of 125 ℃, 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 18min, more fully clean, obtain the finished product bolt after air-dry with water.
The bolt of producing according to the preparation method of wall screw of the present invention, as follows through detecting its mechanical property numerical value of test, the bolt centre hardness reaches 40-42HRC, bolt thread section hardness reaches 36-40HRC, tensile strength reaches 1240Mpa, yield strength reaches 1250Mpa, unit elongation is greater than 11%, and relative reduction in area is greater than 35%, and impelling strength is greater than 50J/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 forging method of wall screw, is characterized in that, procedure of processing comprises:
A, make bar material blank by casting technique, the weight percent 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, Zn 0.025～0.045, Sn 0.02～0.03, Cr≤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 600-650 ℃, forging covering thin layer plant ash on the impression inwall of mould, the granularity of plant ash is controlled to be the 200-300 order, forge number of times no more than 25 times, forge that two dental laminas by reciprocating type tooth roller push the bar material after moulding, by reciprocal action, screw thread is rolled over the type of making, form the outside screw of bolt;
C, thermal treatment, bolt is put into vacuum heat treatment furnace, when being warming up to 450 ± 10 ℃ with stove, the insulation 1-2 hour, when being warming up to 700 ± 10 ℃ with stove, the insulation 40-50 minute, when being warming up to 800-900 ℃ with stove, the insulation 4-5 hour, then the quenching of coming out of the stove, put into again stove after quenching, when being warming up to 550-650 ± 10 ℃ with stove, insulation 6-8 hour, the use of coming out of the stove again hardening liquid is cooling, put into again stove after cooling, when being warming up to 550-650 ℃ with stove, insulation 5-6 hour, then the water-cooled of coming out of the stove;
D, the bolt after thermal treatment is carried out sub-zero treatment, liquid nitrogen temperature is-125～-150 ℃, and the time of sub-zero treatment is 2-5 hour, and the isothermal time in liquid nitrogen is: the cross-sectional area of bolt multiply by 2～3min/mm
2, the bolt that after sub-zero treatment, temperature has been gone back up to room temperature is put into boiling water heating 60-80 minute of 100 ℃;
At first e, bonderizing carry out skimming 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 55%KHSO
4Solution washing carries out cleanup acid treatment, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in Sodium dodecylbenzene sulfonate solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3 minutes, cleans up afterwards;
F, 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. the forging method of wall screw 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 sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from oxidation solution, and spontaneous curing 18min, more fully clean, obtain the finished product bolt after air-dry with water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210511820.8A CN103088266B (en) | 2012-12-04 | 2012-12-04 | The forging method of foundation bolt |
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| CN201210511820.8A CN103088266B (en) | 2012-12-04 | 2012-12-04 | The forging method of foundation bolt |
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| CN103088266B CN103088266B (en) | 2016-05-11 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400359A (en) * | 2014-11-28 | 2015-03-11 | 杨帆 | Method for preparing foundation bolts |
| CN104694845A (en) * | 2015-04-04 | 2015-06-10 | 王文姣 | Heat treatment method for vehicle bumper and vehicle bumper |
| CN107641701A (en) * | 2017-10-17 | 2018-01-30 | 苏州华丰不锈钢紧固件有限公司 | A kind of deep cooling Technology for Heating Processing of steel alloy screw |
| CN109112410A (en) * | 2018-09-30 | 2019-01-01 | 宁波市镇海甬鼎紧固件制造有限公司 | A kind of low temperature resistant high-strength bolt and its production method |
| CN112111697A (en) * | 2020-08-19 | 2020-12-22 | 张清苗 | Preparation method of heavy anti-corrosion alloy connecting bolt |
| CN112226675A (en) * | 2020-08-19 | 2021-01-15 | 张清苗 | Heavy-duty anticorrosive high-strength foundation bolt and preparation method thereof |
| CN112899578A (en) * | 2021-01-21 | 2021-06-04 | 牟昶宇 | Bolt preparation process |
Citations (4)
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| US20030150529A1 (en) * | 2001-03-22 | 2003-08-14 | Nobuyoshi Uno | High-strength bolt excellent in delayed fracture resistance characteristic and its steel product |
| JP2007146284A (en) * | 2005-10-31 | 2007-06-14 | Jfe Steel Kk | High-strength steel excellent in delayed fracture resistance characteristic and metal bolt |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN102260831A (en) * | 2011-07-08 | 2011-11-30 | 曾美霞 | Fastener, such as screw bolt, screw nut and the like made from high-strength steel |
-
2012
- 2012-12-04 CN CN201210511820.8A patent/CN103088266B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030150529A1 (en) * | 2001-03-22 | 2003-08-14 | Nobuyoshi Uno | High-strength bolt excellent in delayed fracture resistance characteristic and its steel product |
| JP2007146284A (en) * | 2005-10-31 | 2007-06-14 | Jfe Steel Kk | High-strength steel excellent in delayed fracture resistance characteristic and metal bolt |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN102260831A (en) * | 2011-07-08 | 2011-11-30 | 曾美霞 | Fastener, such as screw bolt, screw nut and the like made from high-strength steel |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400359A (en) * | 2014-11-28 | 2015-03-11 | 杨帆 | Method for preparing foundation bolts |
| CN104694845A (en) * | 2015-04-04 | 2015-06-10 | 王文姣 | Heat treatment method for vehicle bumper and vehicle bumper |
| CN107641701A (en) * | 2017-10-17 | 2018-01-30 | 苏州华丰不锈钢紧固件有限公司 | A kind of deep cooling Technology for Heating Processing of steel alloy screw |
| CN109112410A (en) * | 2018-09-30 | 2019-01-01 | 宁波市镇海甬鼎紧固件制造有限公司 | A kind of low temperature resistant high-strength bolt and its production method |
| CN112111697A (en) * | 2020-08-19 | 2020-12-22 | 张清苗 | Preparation method of heavy anti-corrosion alloy connecting bolt |
| CN112226675A (en) * | 2020-08-19 | 2021-01-15 | 张清苗 | Heavy-duty anticorrosive high-strength foundation bolt and preparation method thereof |
| CN112899578A (en) * | 2021-01-21 | 2021-06-04 | 牟昶宇 | Bolt preparation process |
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| CN103088266B (en) | 2016-05-11 |
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