CN103088266B - The forging method of foundation bolt - Google Patents

The forging method of foundation bolt Download PDF

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Publication number
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
temperature
forging
warming
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CN103088266A (en
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王立新
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Rudong Yanchuan Property Management Co., Ltd
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Hefei Hongjie New Material Science And Technology Co Ltd
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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

The forging method of foundation bolt
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.
CN201210511820.8A 2012-12-04 2012-12-04 The forging method of foundation bolt Active CN103088266B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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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