CN103084524B - Flange bolt forging method - Google Patents

Flange bolt forging method Download PDF

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Publication number
CN103084524B
CN103084524B CN201210511848.1A CN201210511848A CN103084524B CN 103084524 B CN103084524 B CN 103084524B CN 201210511848 A CN201210511848 A CN 201210511848A CN 103084524 B CN103084524 B CN 103084524B
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bolt
forging
processing
temperature
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CN103084524A (en
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王立新
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Anhui Liufang Zhonglian Mechanical Share Co Ltd
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Anhui Liufang Zhonglian Mechanical Share Co Ltd
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Abstract

The invention discloses a kind of flange bolt forging method, 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, Ba? 0.025~0.045, Sn? 0.02~0.03, Mg≤0.02, 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, utilize fine turning lathe turning to go out bolt external screw thread after forging moulding. Flange bolt forging method 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

Flange bolt forging method
Technical field
The present invention relates to the processing method of bolt, especially a kind of flange bolt forging method.
Background technology
Flange 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 high-strength bolt production method is studied and improved, guaranteed the quality stability of flange 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 flange bolt, the better bolt of manufacturing machine performance.
Summary of the invention
The object of the invention is to avoid weak point of the prior art, and a kind of flange bolt forging method is provided.
Object of the present invention is as follows by the following technical programs:
Flange bolt forging method, 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, Ba0.025~0.045, Sn0.02~0.03, Mg≤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, utilize fine turning lathe turning to go out bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning is heated to 8-9 hour at 460-550 DEG C for the first time, in 20-30 minute, be warming up to 1080-1120 DEG C again, keep 20 minutes heat times, quench with quenching oil, again the bolt after quenching is carried out to tempering at 500 DEG C and keep 30 minutes, then take out and put into 300-320 DEG C of No. 200 solvent naphthas with oily slow cooling from tempering furnace; Be for the second time by the bolt head of bolt at 800 DEG C ± 20 DEG C, use quenching liquid quenches, then by quench after bolt at 600 DEG C, carry out tempering, 60 minutes duration;
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, 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.
Flange bolt forging method 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.
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 the processing of multi-step, has improved flange bolt bulk strength, and bolt precision is high, and quality is good, and production efficiency is high, and without cutting, without waste material, unit cost declines greatly. Obtain bulk metal and flowed to the bolt that direction is consistent, 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:
Flange bolt forging method, 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, Ba0.025~0.045, Sn0.02~0.03, Mg≤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, utilize fine turning lathe turning to go out bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning is heated to 8-9 hour at 460-550 DEG C for the first time, in 20-30 minute, be warming up to 1080-1120 DEG C again, keep 20 minutes heat times, quench with quenching oil, again the bolt after quenching is carried out to tempering at 500 DEG C and keep 30 minutes, then take out and put into 300-320 DEG C of No. 200 solvent naphthas with oily slow cooling from tempering furnace; Be for the second time by the bolt head of bolt at 800 DEG C ± 20 DEG C, use quenching liquid quenches, then by quench after bolt at 600 DEG C, carry out tempering, 60 minutes duration;
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, 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.
The bolt of producing according to the preparation method of flange bolt of the present invention, as follows through detecting its mechanical performance numerical value of test, bolt centre hardness reaches 40-43HRC, bolt thread section hardness reaches 38-40HRC, shear strength reaches 900Mpa, yield strength reaches 1000Mpa, percentage elongation is greater than 10%, and the contraction percentage of area is greater than 35%, and impact flexibility is greater than 56J/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 (1)

1. flange bolt forging method, 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, Ba0.025~0.045, Sn0.02~0.03, Mg≤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, utilize fine turning lathe turning to go out bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning is heated to 8-9 hour at 460-550 DEG C for the first time, in 20-30 minute, be warming up to 1080-1120 DEG C, keep 20 minutes heat times, quench with quenching oil, again the bolt after quenching is carried out to tempering at 500 DEG C and keep 30 minutes, then take out and put into 300-320 DEG C of No. 200 solvent naphthas with oily slow cooling from tempering furnace; Be for the second time by the bolt head of bolt at 800 DEG C ± 20 DEG C, use quenching liquid quenches, then by quench after bolt at 600 DEG C, carry out tempering, 60 minutes duration;
D, the bolt after heat treatment is carried out to subzero treatment, liquid nitrogen temperature is-125~-150 DEG C, the time of subzero treatment is 2-5 hour, isothermal time in liquid nitrogen is that the cross-sectional area of bolt is multiplied by 2~3min/mm2, and 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 heated 60-80 minute;
E, 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.
CN201210511848.1A 2012-12-04 2012-12-04 Flange bolt forging method Active CN103084524B (en)

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Application Number Priority Date Filing Date Title
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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106567014A (en) * 2016-11-14 2017-04-19 安徽名杰净化科技有限公司 Preparation method of air purifier alloy connecting flange
CN112894284A (en) * 2021-02-01 2021-06-04 温州市盛日汽车附件有限公司 Production process of torsional shear type bolt

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101070580A (en) * 2007-03-05 2007-11-14 大连海事大学 Alloy tool steel in multi-type super-fine carbonates
CN101890618A (en) * 2010-06-17 2010-11-24 鹏驰五金制品有限公司 Processing method of high-strength bolts
CN102152078A (en) * 2011-03-30 2011-08-17 浙江迪特高强度螺栓有限公司 Processing technique for high-strength bolt adopted by bulldozer or excavator pedrail
CN102319990A (en) * 2011-09-30 2012-01-18 山推工程机械股份有限公司 Manufacturing process of low-carbon high-strength bolt for track

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5042068B2 (en) * 2008-02-26 2012-10-03 郁升 曾 Ultra-high-strength cold forging method for mating parts made of austenite 300 series

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101070580A (en) * 2007-03-05 2007-11-14 大连海事大学 Alloy tool steel in multi-type super-fine carbonates
CN101890618A (en) * 2010-06-17 2010-11-24 鹏驰五金制品有限公司 Processing method of high-strength bolts
CN102152078A (en) * 2011-03-30 2011-08-17 浙江迪特高强度螺栓有限公司 Processing technique for high-strength bolt adopted by bulldozer or excavator pedrail
CN102319990A (en) * 2011-09-30 2012-01-18 山推工程机械股份有限公司 Manufacturing process of low-carbon high-strength bolt for track

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