CN103205642A - Preparation method for wear-resistant check bolt - Google Patents

Preparation method for wear-resistant check bolt Download PDF

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Publication number
CN103205642A
CN103205642A CN2013100421519A CN201310042151A CN103205642A CN 103205642 A CN103205642 A CN 103205642A CN 2013100421519 A CN2013100421519 A CN 2013100421519A CN 201310042151 A CN201310042151 A CN 201310042151A CN 103205642 A CN103205642 A CN 103205642A
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China
Prior art keywords
bolt
water
parts
temperature
treatment
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CN2013100421519A
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Chinese (zh)
Inventor
赵光明
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FANCHANG COUNTY QILIN CASTING Co Ltd
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FANCHANG COUNTY QILIN CASTING Co Ltd
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Priority to CN2013100421519A priority Critical patent/CN103205642A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a preparation method for a wear-resistant check bolt. Processing steps comprise a step of casting of a rod material, wherein chemical components of a rod material blank comprise, by weight, 0.28 to 0.32% of C, 0.25 to 0.35% of Mn, 0.05 to 0.15% of V, 0.15 to 0.35% of Si, 0.01 to 0.04% of W, no more than 0.025% of P, no more than 0.035% of S, 0.55 to 0.80% of Ni, 0.20 to 0.30% of Sn and 0.22 to 0.32% of Cu, with the balance being Fe. According to the invention, a cold extruding process is used for processing of the bolt, so strength of the bolt is improved, a hardness number and a strength value required by a 12.9 high-strength bolt are reached, the problems of delayed fracture and fatigue fracture of the bolt under high stress are overcome, and the bolt has reliable connection and hardly breaks during usage, has a prolonged service life and meets usage demands for high strength bolts by a variety of industries in society.

Description

The preparation method of wear-resistant lock bolt
Technical field
The present invention relates to the working method of bolt, especially a kind of preparation method of wear-resistant lock bolt.
Background technology
Lock bolt is fastening piece commonly used in the mechanical industry, and present processing mode is generally the moulding of turning, and intensity often is difficult to guarantee, dangerous phenomenons such as generation is in use sometimes turned around, the fracture of bar portion are very big to industrial production harm.Therefore the high strength bolt 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 the moist relatively 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 wire bolt preparation method, produce more corrosion-resistant, more anti abrasive high strength bolt.
Summary of the invention
The objective of the invention is to avoid weak point of the prior art, and a kind of preparation method of wear-resistant lock bolt is provided.
Purpose of the present invention is as follows by the following technical programs:
The preparation method of wear-resistant lock bolt, procedure of processing comprises:
A, casting bar material, by weight, be fused into molten steel in the steel scrap input middle frequency furnace with 12-14 part earlier, add carburelant again, when treating that the interior temperature of middle frequency furnace rises to 1120~1220 ℃, drop into the steel ingot of 30-35 part again, the foundry returns of the scrap iron of 30-35 part and 12-15 part, deslagging then, add ferromanganese behind the deslagging, alloys such as ferrosilicon, when treating to come out of the stove when the interior temperature of middle frequency furnace rises to 1450 ℃, pour into a mould, the weight percent of each chemical ingredients of control lever material blank should satisfy following requirement: C 0.28~0.32, Mn 0.25~0.35, V 0.05-0.15, Si 0.15~0.35, W 0.01-0.04, P≤0.025, S≤0.035, Ni 0.55~0.80, Sn 0.20~0.30, Cu 0.22~0.32, and surplus is iron;
B, the bar material behind the casting is carried out forging and molding processing, line footpath design requirements according to bolt, forge temperature and be controlled to be 750-800 ℃, cover thin layer flyash at the impression inwall that forges mould, forge number of times no more than 20 times, utilize precision lathe turning to go out the outside screw of bolt after forging moulding, cutter on the lathe is Sintox, the workpiece velocity of rotation guarantees at 3350-3550r.P.M, and begins feed by the relative end of disc head portions, cutting fluid employing water-base cutting fluid;
C, thermal treatment
Bolt outside screw after the precision lathe turning is heated to 740 ℃ ± 10 ℃ with 60 ℃/min intensification, be incubated 1-2 hour, carry out quench cooled with quenching oil again, the bolt after will quenching again heats up to be heated to 20 ℃/min again and carries out temper under 500 ℃, continues insulation 50-70 minute; The polished rod section of bolt is heated up under 800 ± 20 ℃ of the heating with 50 ℃/min, be incubated 1-2 hour, the use hardening liquid carries out quench cooled again, and the bolt after will quenching again heats up to be heated to 20 ℃/min again and carries out temper under 550 ℃, continues insulation 60-70 minute; Carry out carburizing treatment at last, carburizing agent is sent in the tempering stove, carburizing treatment 80~120min in 1100~1150 ℃ of temperature ranges, described carburizing agent are with aluminium sesquioxide fine powder 35~50Wt%, granular graphite 15~30Wt% and carbonate or/and supercarbonate 35~50Wt% obtains after mixing;
D, bonderizing at first carry out skimming treatment with the washing of 14% sodium hydroxide solution, and temperature is controlled between 55-60 ℃, and the time is 5-6 minute, then washing; Use 18%KHSO again 4Solution washing carries out cleanup acid treatment, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; At last under 40 ℃ of situations of temperature, the concentration that adopts volume ratio to be respectively 1-2:2-3:1:3-5:50-60 is in the surfactant soln of 36% HCl solution, diethanolamine, SODIUMNITRATE, hydrogen peroxide and water preparation, temperature control is at 45-57 ℃, the immersion time is 3 minutes, cleans up afterwards;
E, Passivation Treatment, it is to handle 4-5min in 100-120 ℃ the inactivating treatment liquid that bolt behind the bonderizing is immersed temperature, described inactivating treatment liquid is to be prepared from by following materials by weight: 4~6 parts of water-soluble molybdates, 8~12 parts of water-soluble manganese salts, 70~100 parts of alkaline silica sols, 80~100 parts of water soluble acrylic resins, 80-100 part water;
F, chromising handle, and the bolt after the Passivation Treatment is put into the wetting ferrochrome powder of hydrochloric acid soln heat, and are heated to 700-900 ℃, keep 60-70min, clean, air-dry again, and bolt gets product.
Described Passivation Treatment, it is to handle 4.5min in 110 ℃ the inactivating treatment liquid that bolt after the thermal treatment is immersed temperature, inactivating treatment liquid is to be prepared from by following materials by weight: 5 parts of water-soluble molybdates, 10 parts of water-soluble manganese salts, 85 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water.
The preparation method of wear-resistant lock bolt of the present invention, adopt the processing of cold-extrusion technology bolt, improved the intensity of bolt, reached required hardness value, the intensity level of high strength bolt, solved delayed fracture and the repeated stress failure of bolt under the high strength, in use connected reliably, not frangibility, improve bolt life, satisfied the social every profession and trade that goes up to the user demand of high strength bolt.
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 does not have hydrogen embrittlement, plasticity-is good;
2, bolt of the present invention has carried out repeatedly cold-heading extrusion molding, has improved the high strength bolt bulk strength, bolt precision height, and quality is good, and the production efficiency height does not have the no waste material of cutting, and unit cost descends greatly.Obtain the bolt that bulk metal flows to the direction unanimity, improved its tensile strength greatly;
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
With the following Examples the present invention is further described:
The preparation method of wear-resistant lock bolt, procedure of processing comprises:
A, casting bar material, by weight, be fused into molten steel in the steel scrap input middle frequency furnace with 12-14 part earlier, add carburelant again, when treating that the interior temperature of middle frequency furnace rises to 1120~1220 ℃, drop into the steel ingot of 30-35 part again, the foundry returns of the scrap iron of 30-35 part and 12-15 part, deslagging then, add ferromanganese behind the deslagging, alloys such as ferrosilicon, when treating to come out of the stove when the interior temperature of middle frequency furnace rises to 1450 ℃, pour into a mould, the weight percent of each chemical ingredients of control lever material blank should satisfy following requirement: C 0.28~0.32, Mn 0.25~0.35, V 0.05-0.15, Si 0.15~0.35, W 0.01-0.04, P≤0.025, S≤0.035, Ni 0.55~0.80, Sn 0.20~0.30, Cu 0.22~0.32, and surplus is iron;
B, the bar material behind the casting is carried out forging and molding processing, line footpath design requirements according to bolt, forge temperature and be controlled to be 750-800 ℃, cover thin layer flyash at the impression inwall that forges mould, forge number of times no more than 20 times, utilize precision lathe turning to go out the outside screw of bolt after forging moulding, cutter on the lathe is Sintox, the workpiece velocity of rotation guarantees at 3350-3550r.P.M, and begins feed by the relative end of disc head portions, cutting fluid employing water-base cutting fluid;
C, thermal treatment
Bolt outside screw after the precision lathe turning is heated to 740 ℃ ± 10 ℃ with 60 ℃/min intensification, be incubated 1-2 hour, carry out quench cooled with quenching oil again, the bolt after will quenching again heats up to be heated to 20 ℃/min again and carries out temper under 500 ℃, continues insulation 50-70 minute; The polished rod section of bolt is heated up under 800 ± 20 ℃ of the heating with 50 ℃/min, be incubated 1-2 hour, the use hardening liquid carries out quench cooled again, and the bolt after will quenching again heats up to be heated to 20 ℃/min again and carries out temper under 550 ℃, continues insulation 60-70 minute; Carry out carburizing treatment at last, carburizing agent is sent in the tempering stove, carburizing treatment 80~120min in 1100~1150 ℃ of temperature ranges, described carburizing agent are with aluminium sesquioxide fine powder 35~50Wt%, granular graphite 15~30Wt% and carbonate or/and supercarbonate 35~50Wt% obtains after mixing;
D, bonderizing at first carry out skimming treatment with the washing of 14% sodium hydroxide solution, and temperature is controlled between 55-60 ℃, and the time is 5-6 minute, then washing; Use 18%KHSO again 4Solution washing carries out cleanup acid treatment, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; At last under 40 ℃ of situations of temperature, the concentration that adopts volume ratio to be respectively 1-2:2-3:1:3-5:50-60 is in the surfactant soln of 36% HCl solution, diethanolamine, SODIUMNITRATE, hydrogen peroxide and water preparation, temperature control is at 45-57 ℃, the immersion time is 3 minutes, cleans up afterwards;
E, Passivation Treatment, it is to handle 4-5min in 100-120 ℃ the inactivating treatment liquid that bolt behind the bonderizing is immersed temperature, described inactivating treatment liquid is to be mixed with by following materials by weight to form: 4~6 parts of water-soluble molybdates, 8~12 parts of water-soluble manganese salts, 70~100 parts of alkaline silica sols, 80~100 parts of water soluble acrylic resins, 80-100 part water;
F, chromising handle, and the bolt after the Passivation Treatment is put into the wetting ferrochrome powder of hydrochloric acid soln heat, and are heated to 700-900 ℃, keep 60-70min, clean, air-dry again, and bolt gets product.
Described Passivation Treatment, it is to handle 4.5min in 110 ℃ the inactivating treatment liquid that bolt after the thermal treatment is immersed temperature, inactivating treatment liquid is to be prepared from by following materials by weight: 5 parts of water-soluble molybdates, 10 parts of water-soluble manganese salts, 85 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water.
The bolt of producing according to the preparation method of wear-resistant lock bolt of the present invention, as follows through detecting its mechanical property numerical value of test, the bolt centre hardness reaches 42-45HRC, tensile strength reaches 1210Mpa, yield strength reaches 1250Mpa, unit elongation is greater than 12%, relative reduction in area is greater than 35%, and impelling strength is greater than 55J/cm 2, the high 10-12% of bolt that comprehensive mechanical performance produces than existing technology.
Should be noted that at last; above embodiment only is used for explanation technical scheme of the present invention 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 make amendment 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 preparation method of wear-resistant lock bolt is characterized in that, procedure of processing comprises:
A, casting bar material, by weight, be fused into molten steel in the steel scrap input middle frequency furnace with 12-14 part earlier, add carburelant again, when treating that the interior temperature of middle frequency furnace rises to 1120~1220 ℃, drop into the steel ingot of 30-35 part again, the foundry returns of the scrap iron of 30-35 part and 12-15 part, deslagging then, add ferromanganese behind the deslagging, alloys such as ferrosilicon, when treating to come out of the stove when the interior temperature of middle frequency furnace rises to 1450 ℃, pour into a mould, the weight percent of each chemical ingredients of control lever material blank should satisfy following requirement: C 0.28~0.32, Mn 0.25~0.35, V 0.05-0.15, Si 0.15~0.35, W 0.01-0.04, P≤0.025, S≤0.035, Ni 0.55~0.80, Sn 0.20~0.30, Cu 0.22~0.32, and surplus is iron;
B, the bar material behind the casting is carried out forging and molding processing, line footpath design requirements according to bolt, forge temperature and be controlled to be 750-800 ℃, cover thin layer flyash at the impression inwall that forges mould, forge number of times no more than 20 times, utilize precision lathe turning to go out the outside screw of bolt after forging moulding, cutter on the lathe is Sintox, the workpiece velocity of rotation guarantees at 3350-3550r.P.M, and begins feed by the relative end of disc head portions, cutting fluid employing water-base cutting fluid;
C, thermal treatment
Bolt outside screw after the precision lathe turning is heated to 740 ℃ ± 10 ℃ with 60 ℃/min intensification, be incubated 1-2 hour, carry out quench cooled with quenching oil again, the bolt after will quenching again heats up to be heated to 20 ℃/min again and carries out temper under 500 ℃, continues insulation 50-70 minute; The polished rod section of bolt is heated up under 800 ± 20 ℃ of the heating with 50 ℃/min, be incubated 1-2 hour, the use hardening liquid carries out quench cooled again, and the bolt after will quenching again heats up to be heated to 20 ℃/min again and carries out temper under 550 ℃, continues insulation 60-70 minute; Carry out carburizing treatment at last, carburizing agent is sent in the tempering stove, carburizing treatment 80~120min in 1100~1150 ℃ of temperature ranges, described carburizing agent are with aluminium sesquioxide fine powder 35~50Wt%, granular graphite 15~30Wt% and carbonate or/and supercarbonate 35~50Wt% obtains after mixing;
D, bonderizing at first carry out skimming treatment with the washing of 14% sodium hydroxide solution, and temperature is controlled between 55-60 ℃, and the time is 5-6 minute, then washing; Use 18%KHSO again 4Solution washing carries out cleanup acid treatment, and temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; At last under 40 ℃ of situations of temperature, the concentration that adopts volume ratio to be respectively 1-2:2-3:1:3-5:50-60 is in the surfactant soln of 36% HCl solution, diethanolamine, SODIUMNITRATE, hydrogen peroxide and water preparation, temperature control is at 45-57 ℃, the immersion time is 3 minutes, cleans up afterwards;
E, Passivation Treatment, it is to handle 4-5min in 100-120 ℃ the inactivating treatment liquid that bolt behind the bonderizing is immersed temperature, described inactivating treatment liquid is to be prepared from by following materials by weight: 4~6 parts of water-soluble molybdates, 8~12 parts of water-soluble manganese salts, 70~100 parts of alkaline silica sols, 80~100 parts of water soluble acrylic resins, 80-100 part water;
F, chromising handle, and the bolt after the Passivation Treatment is put into the wetting ferrochrome powder of hydrochloric acid soln heat, and are heated to 700-900 ℃, keep 60-70min, clean, air-dry again, and bolt gets product.
2. the preparation method of wear-resistant lock bolt according to claim 1, it is characterized in that: described Passivation Treatment, it is to handle 4.5min in 110 ℃ the inactivating treatment liquid that bolt after the thermal treatment is immersed temperature, inactivating treatment liquid is to be prepared from by following materials by weight: 5 parts of water-soluble molybdates, 10 parts of water-soluble manganese salts, 85 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water.
CN2013100421519A 2013-02-04 2013-02-04 Preparation method for wear-resistant check bolt Pending CN103205642A (en)

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Cited By (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
CN105154785A (en) * 2015-07-16 2015-12-16 江苏永昊高强度螺栓有限公司 High-strength bolt and manufacturing method thereof
CN108515137A (en) * 2018-03-27 2018-09-11 宁波世裕五金电器有限公司 A kind of manufacturing method of cold forging high-strength stainless steel setscrew
CN108730303A (en) * 2018-06-12 2018-11-02 绵竹市科迪机械加工有限公司 Bolt with corrosion resistance
CN109023011A (en) * 2018-07-27 2018-12-18 含山县林宏铸造厂 A kind of stainless steel metal plate resistant to high temperature
CN109531064A (en) * 2018-11-27 2019-03-29 重庆旺达汽车零部件有限公司 A kind of bolt processing method
CN110438398A (en) * 2019-08-21 2019-11-12 洛阳双瑞特种装备有限公司 A kind of marine environment high-intensity fasteners steel

Cited By (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
CN105154785A (en) * 2015-07-16 2015-12-16 江苏永昊高强度螺栓有限公司 High-strength bolt and manufacturing method thereof
CN108515137A (en) * 2018-03-27 2018-09-11 宁波世裕五金电器有限公司 A kind of manufacturing method of cold forging high-strength stainless steel setscrew
CN108730303A (en) * 2018-06-12 2018-11-02 绵竹市科迪机械加工有限公司 Bolt with corrosion resistance
CN109023011A (en) * 2018-07-27 2018-12-18 含山县林宏铸造厂 A kind of stainless steel metal plate resistant to high temperature
CN109531064A (en) * 2018-11-27 2019-03-29 重庆旺达汽车零部件有限公司 A kind of bolt processing method
CN110438398A (en) * 2019-08-21 2019-11-12 洛阳双瑞特种装备有限公司 A kind of marine environment high-intensity fasteners steel

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Application publication date: 20130717