CN103133485A - Method for manufacturing abrasion-resistant U-shaped bolt - Google Patents
Method for manufacturing abrasion-resistant U-shaped bolt Download PDFInfo
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- CN103133485A CN103133485A CN2013100427074A CN201310042707A CN103133485A CN 103133485 A CN103133485 A CN 103133485A CN 2013100427074 A CN2013100427074 A CN 2013100427074A CN 201310042707 A CN201310042707 A CN 201310042707A CN 103133485 A CN103133485 A CN 103133485A
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Abstract
The invention discloses a method for manufacturing an abrasion-resistant U-shaped bolt. Machining steps include: casting a U-shaped rod, by weight, adding 11-14 parts of scrap steel into a medium frequency furnace to melt to form molten steel, adding carburant, when the temperature in the medium frequency furnace rises to 1120-1220 DEG C, adding 0.1-0.2 part of molybdenum, 0.2-0.3 part of magnesium ingot, 5-7 parts of scrap aluminum, 32-34 parts of steel ingot, 30-35 parts of pig iron and 12-16 parts of foundry returns, simultaneously scattering a layer of heat preservation covering agent on the surface of the melt and covering, slagging, after slagging, adding 0.6-0.9 part of ferromanganese and 2-3 parts of ferrosilicon alloy, when the temperature in the medium frequency furnace rises to 1400 DEG C, withdrawing, adding 0.4-0.6 part of copper along with molten iron into a ladle, and casting. The method adopts cold extrusion process to machine the bolt, the strength of the bolt is improved, hardness and strength required by the 12.9 high-strength bolt are met, and delayed fracture and fatigue fracture of the bolt under high strength are avoided. The bolt is reliable in connection and not prone to break, prolongs service life, and meets use requirements of various industries in society for the high-strength bolt.
Description
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 commonly used in machinery industry, and present processing mode is generally the moulding of turning, and intensity often is difficult to guarantee, sometimes in use produce turn around, the dangerous phenomenon such as bar section fracture, endanger very large to industrial production.Therefore the high-strength bolt production method is studied and improved, guaranteed the mass stability of high-strength bolt, technology and expanding economy are had important function.In addition, when bolt was in relatively moist 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 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.
Purpose 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 be fused into molten steel in the steel scrap input middle frequency furnace with 11-14 part, add again and add the carbon agent, when the temperature in middle frequency furnace rises to 1120～1220 ℃, drop into again the steel ingot of 32-34 part, the foundry returns of the pig iron of 30-35 part and 12-16 part, sprinkling the one layer of heat preservation covering agent to molten surface simultaneously covers, fusing, then deslagging, add the alloys such as ferrosilicon after deslagging, when coming out of the stove during the temperature to 1400 in middle frequency furnace ℃, pour into a mould, the weight percentage of each chemical composition of controlling rod material blank should satisfy 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, the U-shaped bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 600-650 ℃, forging covering thin layer plant ash on the impression inwall of mould, the granularity of plant ash is controlled to be the 200-300 order, forge number of times no more than 25 times, forge that two dental laminas by reciprocating type tooth roller push the bar material after moulding, by reciprocal action, U-shaped bar material two ends screw thread is rolled over the type of making, form the outside thread of U bolt;
C, heat treatment
The bar material of reciprocating type tooth roller being rolled over the type of making heats up with 60 ℃/min and is heated to 720 ℃ ± 10 ℃, be incubated 1-2 hour, carry out quench cooling with quenching oil again, then the bolt after quenching heats up to be heated to again and carry out temper under 500 ℃ with 25 ℃/min, continue insulation 60-70 minute; The polished rod section of bolt is heated up under 800 ± 20 ℃ of heating with 30 ℃/min, be incubated 1-2 hour, the use quenching liquid carries out quench cooling again, then the bolt after quenching heats up to be heated to 20 ℃/min again and carry out temper under 550 ℃, continues insulation 60-70 minute; Carry out at last Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 60～80min in 1000～1150 ℃ of temperature ranges, described carburizer is comprised 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 mixes;
D, ageing treatment are put into aging oven with bolt after heat treatment and are heated to 150-170 ℃, are incubated 2-3 hour, then take out nature cooling,
E, passivation, it is to process 4-5min in the inactivating treatment liquid of 100-120 ℃ that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 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, boronising are processed, by weight: at first 85-90 part borax anhydrous is put into container handling, be heated to 850 ℃, then add 12-15 part SiC powder to stir, treat that borax anhydrous melts fully, when the bath temperature reaches 880 ℃, then add 10-12 part Na
2CO
3, strengthen being stirred to the bath temperature and reach 900 ℃, the bolt after passivation is placed into boronising in borax bath, the bath temperature keeps 850 ℃ of constant temperature, time 2-4 hour, naturally cool to normal temperature, then clean, air-dry, bolt gets product.
Described passivation, it is to process 4.5min in the inactivating treatment liquid of 110 ℃ that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 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, improved the intensity of bolt, reached required hardness number, the intensity level of high-strength bolt, solved delayed fracture and the fatigue fracture of bolt under high strength, in use connected reliably, not frangibility, improve bolt life, satisfied social upper every profession and trade to the user demand of 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, the 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 cold-heading extrusion modling, has improved the high-strength bolt bulk strength, and the bolt precision is high, quality is good, and manufacturing efficiency is high, without cutting without waste material, cost per unit descends greatly, has obtained bulk metal and has flowed to the consistent bolt of direction, has greatly improved its tensile strength;
3, the invention of heat 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
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 be fused into molten steel in the steel scrap input middle frequency furnace with 11-14 part, add again and add the carbon agent, when the temperature in middle frequency furnace rises to 1120～1220 ℃, drop into again the steel ingot of 32-34 part, the foundry returns of the pig iron of 30-35 part and 12-16 part, sprinkling the one layer of heat preservation covering agent to molten surface simultaneously covers, fusing, then deslagging, add the alloys such as ferrosilicon after deslagging, when coming out of the stove during the temperature to 1400 in middle frequency furnace ℃, pour into a mould, the weight percentage of each chemical composition of controlling rod material blank should satisfy 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, the U-shaped bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 600-650 ℃, forging covering thin layer plant ash on the impression inwall of mould, the granularity of plant ash is controlled to be the 200-300 order, forge number of times no more than 25 times, forge that two dental laminas by reciprocating type tooth roller push the bar material after moulding, by reciprocal action, U-shaped bar material two ends screw thread is rolled over the type of making, form the outside thread of U bolt;
C, heat treatment
The bar material of reciprocating type tooth roller being rolled over the type of making heats up with 60 ℃/min and is heated to 720 ℃ ± 10 ℃, be incubated 1-2 hour, carry out quench cooling with quenching oil again, then the bolt after quenching heats up to be heated to again and carry out temper under 500 ℃ with 25 ℃/min, continue insulation 60-70 minute; The polished rod section of bolt is heated up under 800 ± 20 ℃ of heating with 30 ℃/min, be incubated 1-2 hour, the use quenching liquid carries out quench cooling again, then the bolt after quenching heats up to be heated to 20 ℃/min again and carry out temper under 550 ℃, continues insulation 60-70 minute; Carry out at last Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 60～80min in 1000～1150 ℃ of temperature ranges, described carburizer is comprised 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 mixes;
D, ageing treatment are put into aging oven with bolt after heat treatment and are heated to 150-170 ℃, are incubated 2-3 hour, then take out nature cooling,
E, passivation, it is to process 4.5min in the inactivating treatment liquid of 110 ℃ that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 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, boronising are processed, by weight: at first 85-90 part borax anhydrous is put into container handling, be heated to 850 ℃, then add 12-15 part SiC powder to stir, treat that borax anhydrous melts fully, when the bath temperature reaches 880 ℃, then add 10-12 part Na
2CO
3, strengthen being stirred to the bath temperature and reach 900 ℃, the bolt after passivation is placed into boronising in borax bath, the bath temperature keeps 850 ℃ of constant temperature, time 2-4 hour, naturally cool to normal temperature, then clean, air-dry, bolt gets product.
The bolt of producing according to the preparation method of wear-resistant U bolt of the present invention, as follows through detecting its mechanical property numerical value of test, the 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 high 11-13% of bolt that comprehensive mechanical performance produces than existing technique.
Should be noted that at last; above embodiment only is used for technological scheme of the present invention being described 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 modify or be equal to replacement technological 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 U bolt, is characterized in that, process step comprises:
a, casting U-shaped bar material, by weight, first be fused into molten steel in the steel scrap input middle frequency furnace with 11-14 part, add again and add the carbon agent, when the temperature in middle frequency furnace rises to 1120～1220 ℃, drop into again the steel ingot of 32-34 part, the foundry returns of the pig iron of 30-35 part and 12-16 part, sprinkling the one layer of heat preservation covering agent to molten surface simultaneously covers, fusing, then deslagging, add the alloys such as ferrosilicon after deslagging, when coming out of the stove during the temperature to 1400 in middle frequency furnace ℃, pour into a mould, the weight percentage of each chemical composition of controlling rod material blank should satisfy 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, the U-shaped bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 600-650 ℃, forging covering thin layer plant ash on the impression inwall of mould, the granularity of plant ash is controlled to be the 200-300 order, forge number of times no more than 25 times, forge that two dental laminas by reciprocating type tooth roller push the bar material after moulding, by reciprocal action, U-shaped bar material two ends screw thread is rolled over the type of making, form the outside thread of U bolt;
C, heat treatment
The bar material of reciprocating type tooth roller being rolled over the type of making heats up with 60 ℃/min and is heated to 720 ℃ ± 10 ℃, be incubated 1-2 hour, carry out quench cooling with quenching oil again, then the bolt after quenching heats up to be heated to again and carry out temper under 500 ℃ with 25 ℃/min, continue insulation 60-70 minute; The polished rod section of bolt is heated up under 800 ± 20 ℃ of heating with 30 ℃/min, be incubated 1-2 hour, the use quenching liquid carries out quench cooling again, then the bolt after quenching heats up to be heated to 20 ℃/min again and carry out temper under 550 ℃, continues insulation 60-70 minute; Carry out at last Carburization Treatment, carburizer is sent in tempering furnace, Carburization Treatment 60～80min in 1000～1150 ℃ of temperature ranges, described carburizer is comprised 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 mixes;
D, ageing treatment are put into aging oven with bolt after heat treatment and are heated to 150-170 ℃, are incubated 2-3 hour, then take out nature cooling,
E, passivation, it is to process 4-5min in the inactivating treatment liquid of 100-120 ℃ that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 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, boronising are processed, by weight: at first 85-90 part borax anhydrous is put into container handling, be heated to 850 ℃, then add 12-15 part SiC powder to stir, treat that borax anhydrous melts fully, when the bath temperature reaches 880 ℃, then add 10-12 part Na
2CO
3, strengthen being stirred to the bath temperature and reach 900 ℃, the bolt after passivation is placed into boronising in borax bath, the bath temperature keeps 850 ℃ of constant temperature, time 2-4 hour, naturally cool to normal temperature, then clean, air-dry, bolt gets product.
2. the preparation method of wear-resistant U bolt according to claim 1, it is characterized in that: described passivation, it is to process 4.5min in the inactivating treatment liquid of 110 ℃ that bolt after ageing treatment is immersed temperature, described inactivating treatment liquid is that the material by the following weight proportioning is prepared from: 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310042707.4A CN103133485B (en) | 2013-02-04 | 2013-02-04 | The preparation method of wear-resistant U bolt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310042707.4A CN103133485B (en) | 2013-02-04 | 2013-02-04 | The preparation method of wear-resistant U bolt |
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| CN103133485A true CN103133485A (en) | 2013-06-05 |
| CN103133485B CN103133485B (en) | 2015-08-19 |
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Cited By (2)
| 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)
| 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 |
-
2013
- 2013-02-04 CN CN201310042707.4A patent/CN103133485B/en active Active
Patent Citations (3)
| 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 |
Cited By (2)
| 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 |
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| CN103133485B (en) | 2015-08-19 |
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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 |
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