CN103133485B - The preparation method of wear-resistant U bolt - Google Patents

The preparation method of wear-resistant U bolt Download PDF

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Publication number
CN103133485B
CN103133485B CN201310042707.4A CN201310042707A CN103133485B CN 103133485 B CN103133485 B CN 103133485B CN 201310042707 A CN201310042707 A CN 201310042707A CN 103133485 B CN103133485 B CN 103133485B
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bolt
parts
temperature
frequency furnace
heated
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CN103133485A (en
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赵光明
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Zhejiang Aisin Auto Parts Co., Ltd
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FANCHANG COUNTY QILIN CASTING Co Ltd
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Abstract

The invention discloses the preparation method of wear-resistant U bolt, process step comprises: a, casting U-shaped bar material, by weight, first the steel scrap of 11-14 part is dropped in middle frequency furnace and be fused into molten steel, add again and add carbon agent, when temperature in middle frequency furnace rises to 1120 ~ 1220 DEG C, drop into the molybdenum of 0.1-0.2 part again, the magnesium ingot of 0.2-0.3 part, the aluminium scrap of 5-7 part, the steel ingot of 32-34 part, the pig iron of 30-35 part and the foundry returns of 12-16 part, sprinkle one layer of heat preservation covering agent to molten surface to cover simultaneously, then deslagging, 0.6-0.9 part ferromanganese is added after deslagging, 2-3 part Antaciron, when coming out of the stove when the temperature in middle frequency furnace rises to 1400 DEG C, the copper of 0.4-0.6 part is added ladle with molten iron, pour into a mould.The preparation method of wear-resistant U bolt of the present invention, adopt the processing of cold-extrusion technology bolt, improve the intensity of bolt, reach the hardness number needed for 12.9 high-strength bolts, intensity level, solve delayed fracture and the fatigue fracture of bolt under high strength, in use connect reliable, not frangibility, improve bolt life, meet the upper every profession and trade of society to the user demand of high-strength bolt.

Description

The preparation method of wear-resistant U bolt
Technical field
The present invention relates to the processing method of bolt, especially a kind of preparation method of wear-resistant U bolt.
Background technique
U bolt is fastening piece conventional in machinery industry, and current processing mode is generally the shaping 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, very large to industrial production harm.Therefore high-strength bolt production method is studied and improved, guaranteed the mass stability of high-strength bolt, to technology and expanding economy, be there is important function.In addition, when bolt is in the environment of relative humidity, get rusty easily corrosion, finally causes fracture or crackle, form potential accident source.
Given this, be necessary to provide a kind of U bolt preparation method, produce more corrosion-resistant, more anti abrasive high-strength bolt.
Summary of the invention
The object of the invention is to avoid deficiency of the prior art, and a kind of preparation method of wear-resistant U bolt is provided.
Object of the present invention is as follows by the following technical programs:
The preparation method of wear-resistant U bolt, process step comprises:
A, casting U-shaped bar material, by weight, first the steel scrap of 11-14 part is dropped in middle frequency furnace and be fused into molten steel, add again and add carbon agent, when temperature in middle frequency furnace rises to 1120 ~ 1220 DEG C, drop into the steel ingot of 32-34 part again, the pig iron of 30-35 part and the foundry returns of 12-16 part, sprinkle one layer of heat preservation covering agent to molten surface to cover simultaneously, fusing, then deslagging, the alloys such as ferrosilicon are added after deslagging, when coming out of the stove during temperature to 1400 DEG C in middle frequency furnace, pour into a mould, the weight percentage of each chemical composition of controlling rod material blank should meet following requirement: C 0.27 ~ 0.36, Mn 0.15 ~ 0.19, V 0.05-0.08, Si 0.25 ~ 0.35, W 0.01-0.02, P≤0.025, S≤0.035, Ni 0.45 ~ 0.60, Sn 0.25 ~ 0.35, Cu 0.46 ~ 0.55, surplus is iron,
B, forging and molding processing is carried out to the U-shaped bar material after casting, forging temperature controls as 600-650 DEG C, the impression inwall forging mould covers thin layer plant ash, the Task-size Controlling of plant ash is 200-300 order, forge number of times no more than 25 times, forge shaping after by the two panels dental lamina of reciprocating tooth roller, bar material is pushed, by reciprocal action U-shaped bar material two ends screw thread rolled over and makes type, form the outside thread of U bolt;
C, heat treatment
The bar material of reciprocating tooth roller being rolled over type of making heats up with 60 DEG C/min and is heated to 720 DEG C ± 10 DEG C, insulation 1-2 hour, carry out quench cooling with quenching oil again, then carry out temper at the bolt after quenching is heated to 500 DEG C with 25 DEG C/min intensification again, continue insulation 60-70 minute; By the polished rod section of bolt with at 30 DEG C/min intensification heating 800 ± 20 DEG C, insulation 1-2 hour, use quenching liquid carries out quench cooling again, then carries out temper at the bolt after quenching is heated to 550 DEG C with 20 DEG C/min intensification again, continues insulation 60-70 minute; Finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 60 ~ 80min in 1000 ~ 1150 DEG C of temperature ranges, described carburizer is made up of following parts by weight of component: 35 ~ 50 parts of sepiolite fine powders, 25 ~ 30 parts of granular graphites, 35-50 part carbonite, obtain after said components is uniformly mixed;
D, ageing treatment, put into aging oven by bolt after heat treatment and be heated to 150-170 DEG C, insulation 2-3 hour, then takes out nature cooling,
E, passivation, it is process 4-5min in the inactivating treatment liquid of 100-120 DEG C that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is prepared from by the material of following weight proportioning: 4 ~ 6 parts of hexamcthylenetetramines, 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, Bononizing pretreatment, by weight: first 85-90 part borax anhydrous is put into container handling, be heated to 850 DEG C, then add 12-15 part SiC powder and stir, treat that borax anhydrous melts completely, when bath temperature reaches 880 DEG C, then add 10-12 part Na 2cO 3, strengthen being stirred to bath temperature and reaching 900 DEG C, the bolt after passivation is placed into boronising in borax bath, and bath temperature keeps 850 DEG C of constant temperature, and time 2-4 hour, naturally cools to normal temperature, then carry out cleaning, air-dry, get product bolt.
Described passivation, it is process 4.5min in the inactivating treatment liquid of 110 DEG C that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is prepared from by the material of following weight proportioning: 5 parts of hexamcthylenetetramines, 10 parts of water-soluble manganese salts, 90 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water.
The preparation method of wear-resistant U bolt of the present invention, adopt the processing of cold-extrusion technology bolt, improve the intensity of bolt, reach the hardness number needed for high-strength bolt, intensity level, solve delayed fracture and the fatigue fracture of bolt under high strength, in use connect reliable, not frangibility, improve bolt life, meet the upper every profession and trade of society to the user demand of high-strength bolt.
Beneficial effect of the present invention is:
1, the refinement of the present invention shaping processing technology of material, make wire rod hardness moderate, surface has good phosphatization epithelium, and greasy property is good, wire rod is without hydrogen embrittlement, and plasticity is good;
2, bolt of the present invention has carried out that repeatedly cold-heading is extruded, and improve high-strength bolt bulk strength, bolt precision is high, quality is good, and manufacturing efficiency is high, without cutting no waste mine, cost per unit declines greatly, obtains bulk metal and flows to the consistent bolt in direction, substantially increase its tensile strength;
3, the invention of heat treatment process breaches the limit of the alloy steel products of bolt prior heat treatment, the leading domestic Investment in fastener industry level of characteristic of its super-strong and super-toughened property.
Embodiment
The invention will be further described with the following Examples:
The preparation method of wear-resistant U bolt, process step comprises:
A, casting U-shaped bar material, by weight, first the steel scrap of 11-14 part is dropped in middle frequency furnace and be fused into molten steel, add again and add carbon agent, when temperature in middle frequency furnace rises to 1120 ~ 1220 DEG C, drop into the steel ingot of 32-34 part again, the pig iron of 30-35 part and the foundry returns of 12-16 part, sprinkle one layer of heat preservation covering agent to molten surface to cover simultaneously, fusing, then deslagging, the alloys such as ferrosilicon are added after deslagging, when coming out of the stove during temperature to 1400 DEG C in middle frequency furnace, pour into a mould, the weight percentage of each chemical composition of controlling rod material blank should meet following requirement: C 0.27 ~ 0.36, Mn 0.15 ~ 0.19, V 0.05-0.08, Si 0.25 ~ 0.35, W 0.01-0.02, P≤0.025, S≤0.035, Ni 0.45 ~ 0.60, Sn 0.25 ~ 0.35, Cu 0.46 ~ 0.55, surplus is iron,
B, forging and molding processing is carried out to the U-shaped bar material after casting, forging temperature controls as 600-650 DEG C, the impression inwall forging mould covers thin layer plant ash, the Task-size Controlling of plant ash is 200-300 order, forge number of times no more than 25 times, forge shaping after by the two panels dental lamina of reciprocating tooth roller, bar material is pushed, by reciprocal action U-shaped bar material two ends screw thread rolled over and makes type, form the outside thread of U bolt;
C, heat treatment
The bar material of reciprocating tooth roller being rolled over type of making heats up with 60 DEG C/min and is heated to 720 DEG C ± 10 DEG C, insulation 1-2 hour, carry out quench cooling with quenching oil again, then carry out temper at the bolt after quenching is heated to 500 DEG C with 25 DEG C/min intensification again, continue insulation 60-70 minute; By the polished rod section of bolt with at 30 DEG C/min intensification heating 800 ± 20 DEG C, insulation 1-2 hour, use quenching liquid carries out quench cooling again, then carries out temper at the bolt after quenching is heated to 550 DEG C with 20 DEG C/min intensification again, continues insulation 60-70 minute; Finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 60 ~ 80min in 1000 ~ 1150 DEG C of temperature ranges, described carburizer is made up of following parts by weight of component: 35 ~ 50 parts of sepiolite fine powders, 25 ~ 30 parts of granular graphites, 35-50 part carbonite, obtain after said components is uniformly mixed;
D, ageing treatment, put into aging oven by bolt after heat treatment and be heated to 150-170 DEG C, insulation 2-3 hour, then takes out nature cooling,
E, passivation, it is process 4.5min in the inactivating treatment liquid of 110 DEG C that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is prepared from by the material of following weight proportioning: 5 parts of hexamcthylenetetramines, 10 parts of water-soluble manganese salts, 90 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water;
F, Bononizing pretreatment, by weight: first 85-90 part borax anhydrous is put into container handling, be heated to 850 DEG C, then add 12-15 part SiC powder and stir, treat that borax anhydrous melts completely, when bath temperature reaches 880 DEG C, then add 10-12 part Na 2cO 3, strengthen being stirred to bath temperature and reaching 900 DEG C, the bolt after passivation is placed into boronising in borax bath, and bath temperature keeps 850 DEG C of constant temperature, and time 2-4 hour, naturally cools to normal temperature, then carry out cleaning, air-dry, get product bolt.
According to the bolt that the preparation method of wear-resistant U bolt of the present invention produces, as follows through its mechanical property numerical value of detection experiment, bolt centre hardness reaches 43-46HRC, tensile strength reaches 1000Mpa, yield strength reaches 1200Mpa, specific elongation is greater than 11%, reduction of cross sectional area is greater than 33%, and impact toughness is greater than 60J/cm 2, the bolt height 11-13% that comprehensive mechanical performance goes out than existing manufacture technics.
Finally should be noted that; above embodiment is only for illustration of technological scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technological scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.

Claims (2)

1. the preparation method of wear-resistant U bolt, is characterized in that, process step comprises:
A, casting U-shaped bar material, by weight, first the steel scrap of 11-14 part is dropped in middle frequency furnace and be fused into molten steel, add again and add carbon agent, when temperature in middle frequency furnace rises to 1120 ~ 1220 DEG C, drop into the steel ingot of 32-34 part again, the pig iron of 30-35 part and the foundry returns of 12-16 part, sprinkle one layer of heat preservation covering agent to molten surface to cover simultaneously, fusing, then deslagging, the alloys such as ferrosilicon are added after deslagging, when coming out of the stove during temperature to 1400 DEG C in middle frequency furnace, pour into a mould, the weight percentage of each chemical composition of controlling rod material blank should meet following requirement: C 0.27 ~ 0.36, Mn 0.15 ~ 0.19, V 0.05-0.08, Si 0.25 ~ 0.35, W 0.01-0.02, P≤0.025, S≤0.035, Ni 0.45 ~ 0.60, Sn 0.25 ~ 0.35, Cu 0.46 ~ 0.55, surplus is iron,
B, forging and molding processing is carried out to the U-shaped bar material after casting, forging temperature controls as 600-650 DEG C, the impression inwall forging mould covers thin layer plant ash, the Task-size Controlling of plant ash is 200-300 order, forge number of times no more than 25 times, forge shaping after by the two panels dental lamina of reciprocating tooth roller, bar material is pushed, by reciprocal action U-shaped bar material two ends screw thread rolled over and makes type, form the outside thread of U bolt;
C, heat treatment
The bar material of reciprocating tooth roller being rolled over type of making heats up with 60 DEG C/min and is heated to 720 DEG C ± 10 DEG C, insulation 1-2 hour, carry out quench cooling with quenching oil again, then carry out temper at the bolt after quenching is heated to 500 DEG C with 25 DEG C/min intensification again, continue insulation 60-70 minute; By the polished rod section of bolt with at 30 DEG C/min intensification heating 800 ± 20 DEG C, insulation 1-2 hour, use quenching liquid carries out quench cooling again, then carries out temper at the bolt after quenching is heated to 550 DEG C with 20 DEG C/min intensification again, continues insulation 60-70 minute; Finally carry out Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 60 ~ 80min in 1000 ~ 1150 DEG C of temperature ranges, described carburizer is made up of following parts by weight of component: 35 ~ 50 parts of sepiolite fine powders, 25 ~ 30 parts of granular graphites, 35-50 part carbonite, obtain after said components is uniformly mixed;
D, ageing treatment, put into aging oven by bolt after heat treatment and be heated to 150-170 DEG C, insulation 2-3 hour, then takes out nature cooling,
E, passivation, it is process 4-5min in the inactivating treatment liquid of 100-120 DEG C that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is prepared from by the material of following weight proportioning: 4 ~ 6 parts of hexamcthylenetetramines, 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, Bononizing pretreatment, by weight: first 85-90 part borax anhydrous is put into container handling, be heated to 850 DEG C, then add 12-15 part SiC powder and stir, treat that borax anhydrous melts completely, when bath temperature reaches 880 DEG C, then add 10-12 part Na 2cO 3, strengthen being stirred to bath temperature and reaching 900 DEG C, the bolt after passivation is placed into boronising in borax bath, and bath temperature keeps 850 DEG C of constant temperature, and time 2-4 hour, naturally cools to normal temperature, then carry out cleaning, air-dry, get product bolt.
2. the preparation method of wear-resistant U bolt according to claim 1, it is characterized in that: described passivation, it is process 4.5min in the inactivating treatment liquid of 110 DEG C that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is prepared from by the material of following weight proportioning: 5 parts of hexamcthylenetetramines, 10 parts of water-soluble manganese salts, 90 parts of alkaline silica sols, 90 parts of water soluble acrylic resins, 90 parts of water.
CN201310042707.4A 2013-02-04 2013-02-04 The preparation method of wear-resistant U bolt Active CN103133485B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106756465A (en) * 2016-12-27 2017-05-31 怀宁县鑫泰钢结构有限公司 A kind of heat-preserving hose antirust joint
CN108677081A (en) * 2018-06-12 2018-10-19 绵竹市科迪机械加工有限公司 The preparation method of high-strength bolt

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101229619A (en) * 2007-01-24 2008-07-30 中国科学院金属研究所 Method of preparing high strength magnesium sheet alloy
CN101486087A (en) * 2009-02-11 2009-07-22 江苏大学 Casting and forging combined technique of aluminum alloy linkage rod
CN102321860A (en) * 2011-09-25 2012-01-18 宁波市鄞州锡青铜带制品有限公司 Method for preparing high-performance tin phosphorus bronze band

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101229619A (en) * 2007-01-24 2008-07-30 中国科学院金属研究所 Method of preparing high strength magnesium sheet alloy
CN101486087A (en) * 2009-02-11 2009-07-22 江苏大学 Casting and forging combined technique of aluminum alloy linkage rod
CN102321860A (en) * 2011-09-25 2012-01-18 宁波市鄞州锡青铜带制品有限公司 Method for preparing high-performance tin phosphorus bronze band

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Effective date of registration: 20191108

Address after: Heshan Town Industrial Zone Jiaxing city 314500 Zhejiang city of Tongxiang Province

Patentee after: Zhejiang jinshandi board Co., Ltd

Address before: The new village of Anhui province 241200 Wuhu Fanchang County town of Xingang City

Patentee before: Fanchang County Qilin Casting Co., Ltd.

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Effective date of registration: 20200527

Address after: 314516 Building 2, No. 27, Guangfu West Road, Heshan Town, Tongxiang City, Jiaxing City, Zhejiang Province

Patentee after: Zhejiang Aisin Auto Parts Co., Ltd

Address before: Heshan Town Industrial Zone Jiaxing city 314500 Zhejiang city of Tongxiang Province

Patentee before: Zhejiang jinshandi board Co., Ltd