CN102200166A - Nodular cast iron crankshaft and its manufacturing method - Google Patents
Nodular cast iron crankshaft and its manufacturing method Download PDFInfo
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- CN102200166A CN102200166A CN2010101342474A CN201010134247A CN102200166A CN 102200166 A CN102200166 A CN 102200166A CN 2010101342474 A CN2010101342474 A CN 2010101342474A CN 201010134247 A CN201010134247 A CN 201010134247A CN 102200166 A CN102200166 A CN 102200166A
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- crankshaft
- ductile iron
- knuckle
- bent axle
- iron crankshaft
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Abstract
The invention provides a nodular cast iron crankshaft and its manufacturing method, wherein the nodular cast iron crankshaft is applied in the engine field. The nodular cast iron crankshaft comprises crankshaft main journals, crankshaft shoulders, a crankpin on the crankshaft, a first transition fillet arranged in the joint of the main journal and the crankshaft shoulder and a second transition fillet arranged in the joint of the crankshaft shoulder and the crankpin on the crankshaft. The method for manufacturing the nodular cast iron crankshaft comprises rolling the first transition fillet and the second transition fillet with rolling pressure being 3Mpa-3.5Mpa and rolling time being 8s-12s. Through the optimization of the fillet rolling pressure during the manufacture process and the structure improvement of crankshaft<,>s vulnerable points, the fatigue strength of the nodular cast iron crankshaft provided by the invention can be raised and the high reliability and security of the nodular cast iron crankshaft can be accomplished.
Description
Technical field
The present invention relates to technical field of engines, relate in particular to ductile iron crankshaft.
Background technique
In the application of China's ductile iron crankshaft, under the condition of equal engine power and equal reliability requirement, existing ductile iron crankshaft also can't replace forged steel crankshaft.Domestic ductile iron crankshaft is used for low detonation pressure, lower powered motor basically; And at high detonation pressure, high-power motor, the spheroidal graphite bent axle can't satisfy the requirement of bending fatigue strength, can only adopt the higher forged steel crankshaft of cost.
In realizing process of the present invention, the inventor finds that present ductile iron crankshaft fatigue resistance is poor, can not satisfy the requirement of high detonation pressure, high output engine.
Summary of the invention
Ductile iron crankshaft is applied to motor, comprises crankshaft main journal, the bent axle shoulder, and crank-shaft link neck, the joint of crankshaft main journal and bent axle shoulder is provided with first knuckle, and the joint of bent axle shoulder and crank-shaft link neck is provided with second knuckle.In conventional spheroidal graphite cast iron rolling crankshafts production technology, the pressure that first knuckle and the second excessive fillet are carried out roll extrusion is 2.8MPa, and the roll extrusion time is 5s.The bent axle that adopts above-mentioned technology to make, bending fatigue strength is low, and in the present invention, has adopted following technology
The adjustment of the parameter by rolling and reinforcing technology, the major parameter rolling pressure is adjusted 5-20%, promptly first knuckle and second knuckle is carried out roll extrusion, and rolling pressure is 3MPa-3.5MPa, and the roll extrusion time is 8s-12s.Preferably, rolling pressure is 3.5MPa, and the roll extrusion time is 10s.
In the technical program, the width of bent axle shoulder is 28mm-30mm.Preferably, the width of bent axle shoulder is 30mm.
In the technical program, the radius of second knuckle is 2.5mm.Crankshaft main journal adopts mid frequency induction hardening, and the non-district of quenching is 5mm.The material of ductile iron crankshaft adopts QT800-6 spheroidal graphite cast iron.
The invention also discloses a kind of manufacture method of ductile iron crankshaft, first knuckle and second knuckle are carried out roll extrusion, rolling pressure is 3MPa-3.5MPa, and the roll extrusion time is 8s-12s.
Preferably, in the technical program, rolling pressure is 3.5MPa; The roll extrusion time is 10s.The width of bent axle shoulder is 30mm, and the width of crank-shaft link neck is set to 36mm.
Ductile iron crankshaft of the present invention by the architecture advances of bent axle weak part and the fillet rolling power optimization of manufacture process are cooperated, can improve the fatigue strength of spherulitic iron crankshaft, realizes high reliability, the Security of spherulitic iron crankshaft.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural drawing of ductile iron crankshaft of the present invention.
Fig. 2 is the structural drawing of the connecting rod shank-connecting cover parts of ductile iron crankshaft correspondence of the present invention.
Mark the following drawings mark thereon in conjunction with the accompanying drawings:
1-bent axle shoulder; The 2-crankshaft main journal; The 3-crank-shaft link neck;
4-first knuckle; 5-second knuckle;
11-connecting rod shank microcephaly; 12-connecting rod shank major part; The 13-connecting rod cap.
Embodiment
Further specify the specific embodiment of the present invention below in conjunction with accompanying drawing.
Product embodiments one:
The technical problem to be solved in the present invention is on the basis of former ductile iron crankshaft, seeks new material, physical dimension and rolling and reinforcing technology parameter and cooperates adjustment to improve the tired moment of flexure value of ductile iron crankshaft, thereby meet or exceed the level of steel axle.
The present invention is that example describes with the bent axle of QT800-6 spheroidal graphite cast iron preparation, and the bent axle of other material preparations similarly no longer is described in detail.Fig. 1 is the structural drawing of ductile iron crankshaft of the present invention.Fig. 2 is the structural drawing of the connecting rod shank-connecting cover parts of ductile iron crankshaft correspondence of the present invention.Ductile iron crankshaft is applied to motor, comprises crankshaft main journal 2, bent axle shoulder 1, crank-shaft link neck 3, the joint of crankshaft main journal 2 and bent axle shoulder 1 is provided with first knuckle 4, and the joint of bent axle shoulder 1 and crank-shaft link neck 3 is provided with second knuckle 5.
1, optimizes rolling technology
The adjustment of the parameter by rolling and reinforcing technology is carried out roll extrusion to first knuckle and 4 second knuckles 5, and the major parameter rolling pressure increases 5-20%, increases the roll extrusion time.Wherein rolling pressure is 3MPa-3.5MPa, and the roll extrusion time is 8s-12s.In particular, the rolling pressure of employing is 3.5MPa, and the roll extrusion time is 10s.The fatigue test moment of flexure value of corresponding QT800-6 bent axle improves about 20%.
2, architecture advances
As depicted in figs. 1 and 2, do not do any adjustment in the housing construction size, also guarantee simultaneously to dwindle the width of crank-shaft link neck 3 and connecting rod shank major part 12, to strengthen the thickness of crankshaft main journal 2 and 3 dangerouse cross-sections of crank-shaft link neck under the connecting rod bearing shell width is constant, bearing area the is constant situation.
Specifically, the thickness of bent axle shoulder 1 increases by two millimeters than conventional thickening 15%, and promptly the 28mm from tratitional technology thickeies to 30mm; The width reduction 4mm of corresponding crank-shaft link neck 3, the 40mm from tratitional technology is 36mm.And the chamfering width at the connecting rod shank major part 12 of connecting rod shank and connecting rod cap 13 two ends correspondingly makes 2mm into by 4mm.In like manner, the width of bent axle shoulder 1 increases suitable size, and other supporting workpiece adjust accordingly also and can reach same effect.In addition, in the present embodiment, the radius of second knuckle 5 is 2.5mm.
3, subsequent technique improves
Crankshaft main journal 2 adopts mid frequency induction hardening, and the non-district of quenching is 5mm.
The YC6108ZQB crankshaft of diesel engine that the claimant produces with said method, crankshaft bending fatigue intensity has improved 20% on former basis, surpass 3700N.m, the fracture cycle-index reaches 107 times, far above the ductile iron crankshaft and the non-modified forged steel crankshaft of the domestic existing trade mark, the modified forged steel crankshaft of 42CrMo of approaching external highest level.The production of this nodular iron casting is made the per kilogram cost with the steel material and is descended more than 10 yuan, with certain 6 cylinder (heavily about 100 kilograms) spherulitic iron crankshaft production is example, every cost of the more modified forged steel crankshaft of its cost of production descends (calculating by conservative) more than 1000 yuan, highlights the superiority of this technology.Ductile iron crankshaft of the present invention is applicable to the vehicular engine of various high powers, high detonation pressure, has a extensive future.
Method embodiment two:
Present embodiment provides a kind of manufacture method of ductile iron crankshaft, as depicted in figs. 1 and 2, ductile iron crankshaft comprises crankshaft main journal 2, bent axle shoulder 1, crank-shaft link neck 3, the joint of crankshaft main journal 2 and bent axle shoulder 1 is provided with first knuckle 4, the joint of bent axle shoulder 1 and crank-shaft link neck 3 is provided with second knuckle 5, first knuckle 4 and second knuckle 5 are carried out roll extrusion, and rolling pressure is 3MPa-3.5MPa, and the roll extrusion time is 8s-12s.Preferably, rolling pressure is 3.5MPa; The roll extrusion time is 10s.Preferably, the width of bent axle shoulder 1 is 30mm, and the width of crank-shaft link neck 3 is set to 36mm.
The ductile iron crankshaft that uses the present invention to produce, by improvement to rolling technology, structural parameter, quenching technical, can improve the bending fatigue strength of spherulitic iron crankshaft, replenish design deficiency such as its overlap coefficient is low, realize high reliability, the Security of spherulitic iron crankshaft.
It should be noted that at last: above embodiment only in order to the explanation the present invention and and unrestricted technological scheme described in the invention; Therefore, although this specification has been described in detail the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technological scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the claim scope of the present invention.
Claims (11)
1. ductile iron crankshaft, be applied to motor, it is characterized in that: comprise crankshaft main journal, the bent axle shoulder, crank-shaft link neck, the joint of crankshaft main journal and bent axle shoulder is provided with first knuckle, the joint of bent axle shoulder and crank-shaft link neck is provided with second knuckle, first knuckle and second knuckle are carried out roll extrusion, and rolling pressure is 3MPa-3.5MPa, and the roll extrusion time is 8s-12s.
2. ductile iron crankshaft according to claim 1 is characterized in that, described rolling pressure is 3.5MPa.
3. ductile iron crankshaft according to claim 2 is characterized in that, the described roll extrusion time is 10s.
4. ductile iron crankshaft according to claim 1 is characterized in that, the width of described bent axle shoulder is 28mm-30mm.
5. ductile iron crankshaft according to claim 4 is characterized in that, the width of described bent axle shoulder is 30mm.
6. according to each described ductile iron crankshaft among the claim 1-5, it is characterized in that the radius of described second knuckle is 2.5mm.
7. according to each described ductile iron crankshaft among the claim 1-5, it is characterized in that described crankshaft main journal adopts mid frequency induction hardening, the non-district of quenching is 5mm.
8. according to each described ductile iron crankshaft among the claim 1-5, it is characterized in that material adopts QT800-6 spheroidal graphite cast iron.
9. the manufacture method of a ductile iron crankshaft, described ductile iron crankshaft is applied to motor, ductile iron crankshaft comprises crankshaft main journal, the bent axle shoulder, crank-shaft link neck, the joint of crankshaft main journal and bent axle shoulder is provided with first knuckle, the joint of bent axle shoulder and crank-shaft link neck is provided with second knuckle, it is characterized in that: first knuckle and second knuckle are carried out roll extrusion, and rolling pressure is 3MPa-3.5MPa, and the roll extrusion time is 8s-12s.
10. manufacture method according to claim 9 is characterized in that, described rolling pressure is 3.5MPa; The described roll extrusion time is 10s.
11. manufacture method according to claim 9 is characterized in that, the width of described bent axle shoulder is set to 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101342474A CN102200166A (en) | 2010-03-25 | 2010-03-25 | Nodular cast iron crankshaft and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101342474A CN102200166A (en) | 2010-03-25 | 2010-03-25 | Nodular cast iron crankshaft and its manufacturing method |
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| CN102200166A true CN102200166A (en) | 2011-09-28 |
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| CN2010101342474A Pending CN102200166A (en) | 2010-03-25 | 2010-03-25 | Nodular cast iron crankshaft and its manufacturing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438088A (en) * | 2013-07-05 | 2013-12-11 | 广西玉柴机器股份有限公司 | Marine engine nodular cast iron crankshaft |
| CN103867556A (en) * | 2014-04-02 | 2014-06-18 | 广西玉柴机器股份有限公司 | Crankshaft for engine |
| CN106002113A (en) * | 2015-03-31 | 2016-10-12 | 三菱自动车工业株式会社 | A method of manufacturing a crankshaft |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61176461A (en) * | 1985-01-30 | 1986-08-08 | Mazda Motor Corp | Manufacture of crankshaft |
| CN201057216Y (en) * | 2007-06-12 | 2008-05-07 | 天润曲轴股份有限公司 | Nodular graphite cast iron crankshaft of engine |
| CN101560593A (en) * | 2008-04-14 | 2009-10-21 | 滨州海得曲轴有限责任公司 | Fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft |
-
2010
- 2010-03-25 CN CN2010101342474A patent/CN102200166A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61176461A (en) * | 1985-01-30 | 1986-08-08 | Mazda Motor Corp | Manufacture of crankshaft |
| CN201057216Y (en) * | 2007-06-12 | 2008-05-07 | 天润曲轴股份有限公司 | Nodular graphite cast iron crankshaft of engine |
| CN101560593A (en) * | 2008-04-14 | 2009-10-21 | 滨州海得曲轴有限责任公司 | Fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft |
Non-Patent Citations (2)
| Title |
|---|
| 刘朝贵等: "曲轴滚压及滚压校直工艺的应用与分析", 《轻型汽车技术》, no. 3, 31 December 2000 (2000-12-31) * |
| 张先鸣: "球铁曲轴加工强化技术的新进展", 《机械制造》, no. 10, 31 December 1995 (1995-12-31), pages 7 - 8 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438088A (en) * | 2013-07-05 | 2013-12-11 | 广西玉柴机器股份有限公司 | Marine engine nodular cast iron crankshaft |
| CN103438088B (en) * | 2013-07-05 | 2015-10-28 | 广西玉柴机器股份有限公司 | marine engine nodular cast iron crankshaft |
| CN103867556A (en) * | 2014-04-02 | 2014-06-18 | 广西玉柴机器股份有限公司 | Crankshaft for engine |
| CN106002113A (en) * | 2015-03-31 | 2016-10-12 | 三菱自动车工业株式会社 | A method of manufacturing a crankshaft |
| CN106002113B (en) * | 2015-03-31 | 2018-06-22 | 三菱自动车工业株式会社 | The manufacturing method of bent axle |
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Application publication date: 20110928 |