CN103088266B - The forging method of foundation bolt - Google Patents
The forging method of foundation bolt Download PDFInfo
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- CN103088266B CN103088266B CN201210511820.8A CN201210511820A CN103088266B CN 103088266 B CN103088266 B CN 103088266B CN 201210511820 A CN201210511820 A CN 201210511820A CN 103088266 B CN103088266 B CN 103088266B
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- bolt
- stove
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- warming
- insulation
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005242 forging Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 15
- 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
- 239000000203 mixture Substances 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
- 238000009413 insulation Methods 0.000 claims description 15
- 238000010792 warming Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- 235000010288 sodium nitrite Nutrition 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000002269 spontaneous effect Effects 0.000 claims description 5
- 241000761557 Lamina Species 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 229910000343 potassium bisulfate Inorganic materials 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000000641 cold extrusion Methods 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 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
- 238000005520 cutting process Methods 0.000 description 1
- 210000000981 epithelium Anatomy 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 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
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- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses the forging method of foundation bolt, procedure of processing comprises: a, make bar material blank by casting technique, should the percentage by weight of each chemical composition of control lever material blank meet 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, surplus is iron. The forging method of foundation bolt of the present invention, adopt the processing of cold-extrusion technology bolt, improve the intensity of bolt, reach required hardness number, the intensity level of 12.9 high-strength bolts, solve delayed fracture and the fatigue fracture of bolt under high strength, in use connected reliably not frangibility, improve bolt life, met the user demand of social upper every profession and trade to high-strength bolt.
Description
Technical field
The present invention relates to the processing method of bolt, especially a kind of forging method of foundation bolt.
Background technology
Foundation bolt is securing member conventional in machinery industry, and current processing mode is generally the moulding of turning, and intensity is often difficult to ensure, the dangerous phenomenons such as in use generation is sometimes turned around, the fracture of bar portion are very large to industrial production harm. Therefore foundation bolt production method is studied and improved, guaranteed the quality stability of high-strength bolt, technology and expanding economy are had to important function. In addition, bolt is in relatively moist environment time, and the corrosion that gets rusty easily, finally causes rupturing or crackle, forms potential accident source.
Given this, be necessary to provide a kind of processing method of foundation bolt, produce the foundation bolt more corrosion-resistant, 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 foundation bolt is provided.
Object of the present invention is as follows by the following technical programs:
The forging method of foundation bolt, 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 meet following requirement: C0.25～0.35, Mn0.15～0.25, Si0.15～0.35, W0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni0.15～0.20, Zn0.025～0.045, Sn0.02～0.03, Cr≤0.02, and surplus is iron;
B, the bar material after casting is carried out to forging and molding processing, forging temperature control is 600-650 DEG C, on the impression inwall that forges mould, cover thin layer plant ash, the granularity control of plant ash is 200-300 order, forge number of times no more than 25 times, after forging moulding, by two dental laminas of reciprocating tooth roller, bar material is pushed, by reciprocal action, screw thread is rolled over to the type of making, form the external screw thread of bolt;
C, heat treatment, bolt is put into vacuum heat treatment furnace, while being warming up to 450 ± 10 DEG C with stove, insulation 1-2 hour, while being warming up to 700 ± 10 DEG C with stove, insulation 40-50 minute, while being warming up to 800-900 DEG C with stove, insulation 4-5 hour, then the quenching of coming out of the stove, puts into stove again after quenching, while being warming up to 550-650 ± 10 DEG C with stove, insulation 6-8 hour, the use of coming out of the stove again quenching liquid is cooling, after cooling, put into again stove, while being warming up to 550-650 DEG C with stove, insulation 5-6 hour, then the water-cooled of coming out of the stove;
D, the bolt after heat treatment is carried out to subzero treatment, liquid nitrogen temperature is-125～-150 DEG C, and the time of subzero treatment is 2-5 hour, and the isothermal time in liquid nitrogen is: the cross-sectional area of bolt be multiplied by 2～3min/mm2, the bolt that after subzero treatment, temperature has been gone back up to room temperature is put into the boiling water of 100 DEG C and is heated 60-80 minute;
E, phosphatization processing, first carry out ungrease treatment with 14% sodium hydroxide solution washing, and temperature is controlled between 55-60 DEG C, and the time is 5-6 minute, then washing; Use again 55%KHSO4Solution washing carries out pickling processes, and temperature is controlled at 18-20 DEG C, and the time is 1-2 minute, then washing; Finally, in 40 DEG C of situations of temperature, immerse in neopelex solution, temperature is controlled at 45-57 DEG C, and the immersion time is 3 minutes, cleans up afterwards;
F, blackening process, be under the condition of 120～130 DEG C in temperature, bolt is placed in sodium nitrite solution and processes and be grey black or all black to surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 15～20min, more fully clean, obtain finished product bolt after air-dry with water.
Described blackening process is under temperature is the condition of 125 DEG C, bolt is placed in sodium nitrite solution and processes and be grey black or all black to surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 18min, more fully clean, obtain finished product bolt after air-dry with water.
The forging method of foundation bolt of the present invention, adopt the processing of cold-extrusion technology bolt, improve the intensity of bolt, delayed fracture and the fatigue fracture of foundation bolt are solved, in use connect reliable, not frangibility, has improved bolt life, has met the user demand of social upper every profession and trade to foundation 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, 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 heat treatment, has improved foundation bolt bulk strength, and bolt precision is high, quality is good, and production efficiency is high, without cutting without waste material, unit cost declines greatly, has obtained bulk metal and has flowed to the bolt that direction is consistent, has 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.
Detailed description of the invention
The invention will be further described with the following Examples:
The forging method of foundation bolt, 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 meet following requirement: C0.25～0.35, Mn0.15～0.25, Si0.15～0.35, W0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni0.15～0.20, Zn0.025～0.045, Sn0.02～0.03, Cr≤0.02, and surplus is iron;
B, the bar material after casting is carried out to forging and molding processing, forging temperature control is 600-650 DEG C, on the impression inwall that forges mould, cover thin layer plant ash, the granularity control of plant ash is 200-300 order, forge number of times no more than 25 times, after forging moulding, by two dental laminas of reciprocating tooth roller, bar material is pushed, by reciprocal action, screw thread is rolled over to the type of making, form the external screw thread of bolt;
C, heat treatment, bolt is put into vacuum heat treatment furnace, while being warming up to 450 ± 10 DEG C with stove, insulation 1-2 hour, while being warming up to 700 ± 10 DEG C with stove, insulation 40-50 minute, while being warming up to 800-900 DEG C with stove, insulation 4-5 hour, then the quenching of coming out of the stove, puts into stove again after quenching, while being warming up to 550-650 ± 10 DEG C with stove, insulation 6-8 hour, the use of coming out of the stove again quenching liquid is cooling, after cooling, put into again stove, while being warming up to 550-650 DEG C with stove, insulation 5-6 hour, then the water-cooled of coming out of the stove;
D, the bolt after heat treatment is carried out to subzero treatment, liquid nitrogen temperature is-125～-150 DEG C, and the time of subzero treatment is 2-5 hour, and the isothermal time in liquid nitrogen is: the cross-sectional area of bolt be multiplied by 2～3min/mm2, the bolt that after subzero treatment, temperature has been gone back up to room temperature is put into the boiling water of 100 DEG C and is heated 60-80 minute;
E, phosphatization processing, first carry out ungrease treatment with 14% sodium hydroxide solution washing, and temperature is controlled between 55-60 DEG C, and the time is 5-6 minute, then washing; Use again 55%KHSO4Solution washing carries out pickling processes, and temperature is controlled at 18-20 DEG C, and the time is 1-2 minute, then washing; Finally, in 40 DEG C of situations of temperature, immerse in neopelex solution, temperature is controlled at 45-57 DEG C, and the immersion time is 3 minutes, cleans up afterwards;
F, blackening process are under temperature is the condition of 125 DEG C, bolt is placed in sodium nitrite solution and processes and be grey black or all black to surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 18min, more fully clean, obtain finished product bolt after air-dry with water.
The bolt of producing according to the preparation method of foundation bolt of the present invention, as follows through detecting its mechanical performance numerical value of test, bolt centre hardness reaches 40-42HRC, bolt thread section hardness reaches 36-40HRC, tensile strength reaches 1240Mpa, yield strength reaches 1250Mpa, percentage elongation is greater than 11%, and the contraction percentage of area is greater than 35%, and impact flexibility is greater than 50J/cm2, the high 10-12% of bolt that comprehensive mechanical performance produces than existing technique.
Finally should be noted that; above embodiment is only for illustrating technical scheme of the present invention but not limiting the scope of the invention; although the present invention is explained in detail with reference to preferred embodiment; 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 depart from essence and the scope of technical solution of the present invention.
Claims (2)
1. the forging method of foundation bolt, 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 meet following requirement: C0.25～0.35, Mn0.15～0.25, Si0.15～0.35, W0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni0.15～0.20, Zn0.025～0.045, Sn0.02～0.03, Cr≤0.02, and surplus is iron;
B, the bar material after casting is carried out to forging and molding processing, forging temperature control is 600-650 DEG C, on the impression inwall that forges mould, cover thin layer plant ash, the granularity control of plant ash is 200-300 order, forge number of times no more than 25 times, after forging moulding, by two dental laminas of reciprocating tooth roller, bar material is pushed, by reciprocal action, screw thread is rolled over to the type of making, form the external screw thread of bolt;
C, heat treatment, bolt is put into vacuum heat treatment furnace, while being warming up to 450 ± 10 DEG C with stove, insulation 1-2 hour, while being warming up to 700 ± 10 DEG C with stove, insulation 40-50 minute, while being warming up to 800-900 DEG C with stove, insulation 4-5 hour, then the quenching of coming out of the stove, puts into stove again after quenching, while being warming up to 550-650 DEG C with stove, insulation 6-8 hour, the use of coming out of the stove again quenching liquid is cooling, after cooling, put into again stove, while being warming up to 550-650 DEG C with stove, insulation 5-6 hour, then the water-cooled of coming out of the stove;
D, the bolt after heat treatment is carried out to subzero treatment, liquid nitrogen temperature is-125～-150 DEG C, and the time of subzero treatment is 2-5 hour, and the isothermal time in liquid nitrogen is: the cross-sectional area of bolt is multiplied by 2～3min/mm2, the bolt that after subzero treatment, temperature has been gone back up to room temperature is put into the boiling water of 100 DEG C and is heated 60-80 minute;
E, first carry out ungrease treatment with 14% sodium hydroxide solution washing, temperature is controlled between 55-60 DEG C, and the time is 5-6 minute, then washing; Use again 55%KHSO4Solution washing carries out pickling processes, and temperature is controlled at 18-20 DEG C, and the time is 1-2 minute, then washing; Finally, in 40 DEG C of situations of temperature, immerse in neopelex solution, temperature is controlled at 45-57 DEG C, and the immersion time is 3 minutes, cleans up afterwards;
F, blackening process, be under the condition of 120～130 DEG C in temperature, bolt is placed in sodium nitrite solution and processes and be grey black or all black to surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 15～20min, more fully clean, obtain finished product bolt after air-dry with water.
2. the forging method of foundation bolt according to claim 1, it is characterized in that: described blackening process is under temperature is the condition of 125 DEG C, bolt is placed in sodium nitrite solution and processes and be grey black or all black to surface, then bolt is taken out from sodium nitrite solution, and spontaneous curing 18min, more fully clean, obtain finished product bolt after air-dry with water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511820.8A CN103088266B (en) | 2012-12-04 | 2012-12-04 | The forging method of foundation bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511820.8A CN103088266B (en) | 2012-12-04 | 2012-12-04 | The forging method of foundation bolt |
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| CN103088266A CN103088266A (en) | 2013-05-08 |
| CN103088266B true CN103088266B (en) | 2016-05-11 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400359A (en) * | 2014-11-28 | 2015-03-11 | 杨帆 | Method for preparing foundation bolts |
| CN104694845B (en) * | 2015-04-04 | 2016-11-30 | 胡贤晨 | The heat treatment method of a kind of bumper and this 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4142853B2 (en) * | 2001-03-22 | 2008-09-03 | 新日本製鐵株式会社 | High strength bolt with excellent delayed fracture resistance |
| JP5167616B2 (en) * | 2005-10-31 | 2013-03-21 | Ｊｆｅスチール株式会社 | Metal bolts with excellent delayed fracture resistance |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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