CN201057216Y - Nodular cast iron crankshaft of engine - Google Patents
Nodular cast iron crankshaft of engine Download PDFInfo
- Publication number
- CN201057216Y CN201057216Y CNU2007201518117U CN200720151811U CN201057216Y CN 201057216 Y CN201057216 Y CN 201057216Y CN U2007201518117 U CNU2007201518117 U CN U2007201518117U CN 200720151811 U CN200720151811 U CN 200720151811U CN 201057216 Y CN201057216 Y CN 201057216Y
- Authority
- CN
- China
- Prior art keywords
- crankshaft
- cast iron
- forged steel
- model
- bent axle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 230000007704 transition Effects 0.000 abstract 2
- 238000005121 nitriding Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 230000002929 anti-fatigue Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KRQUFUKTQHISJB-YYADALCUSA-N 2-[(E)-N-[2-(4-chlorophenoxy)propoxy]-C-propylcarbonimidoyl]-3-hydroxy-5-(thian-3-yl)cyclohex-2-en-1-one Chemical compound CCC\C(=N/OCC(C)OC1=CC=C(Cl)C=C1)C1=C(O)CC(CC1=O)C1CCCSC1 KRQUFUKTQHISJB-YYADALCUSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
Landscapes
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The utility model provides an engine crankshaft of nodular cast iron for replace the forged steel bent axle with the model. Compared with the forged steel crankshafts of the same type, the diameter of the front end shaft neck of the free end of the engine crankshaft of the nodular cast iron is increased by 7-12%, and the diameter of the inner end shaft neck is increased by 4-8%; the radius of a transition fillet at the joint of the free end and the main journal is increased by 40-60%; the crank arm of the nodular cast iron crankshaft is in a double-lug shape which symmetrically extends outwards from left to right, and the maximum width of the double-lug shape is 20-40% larger than that of the corresponding part of the forged steel crankshaft of the same type. The surface of the nodular cast iron crankshaft of the utility model is treated by glow ion nitriding treatment; and the enlarged transition round corners, the main journal and the connecting rod journal are subjected to rolling treatment. The utility model discloses a life of nodular cast iron bent axle is the same with the life of the forged steel bent axle of the same model or slightly higher than it.
Description
Technical field
The utility model relates to engine crankshaft, particularly relates to ductile iron crankshaft.
Background technique
Modern heavily card engine crankshaft, particularly WD 615 Series Crankshaft are used forged steel more, make as No. 45 Fine Steel Casting irons or 42CrMo alloyed steel.Though forged steel has good antifatigue, resistant to bending performance, the processing technology of forged steel crankshaft is comparatively complicated, and manufacturing efficiency is low, the cost height.Therefore, those skilled in the art expect to use always comprehensive mechanical performance preferably spheroidal graphite cast iron substitute forged steel and produce bent axle, particularly WD 615 Series Crankshaft.Although known spheroidal graphite cast iron has good comprehensive mechanical performance in the present technique field, but its antifatigue, resistant to bending ability are inferior to forged steel, so directly replace forged steel to produce bent axle simply with spheroidal graphite cast iron, and the structure of bent axle itself do not done corresponding adjust or change, the ductile iron crankshaft of producing like this is the technical requirements that can not satisfy the user.
Summary of the invention
The purpose of this utility model is to provide a kind of and is suitable for the bent axle spheroidal graphite cast iron manufacturing, that have specified structure.
The utility model provides a kind of new type crank, it is characterized in that this bent axle makes with spheroidal graphite cast iron; Compare with the forged steel crankshaft of same model, the diameter that the diameter of its free-ended front end diameter of axle neck increases 7%-12%, its inner end diameter of axle increases 4%-8%.
The crankweb of above-mentioned ductile iron crankshaft is symmetrically overhanging to the left and right biconvex ear shape, compares with the forged steel crankshaft corresponding site of same model, and the width of its widest position increases 20%-24%.
The knuckle radius of the free end of above-mentioned ductile iron crankshaft and main journal joint is compared with the forged steel crankshaft of same model, increase 40%-60%, and this fillet place handles through roll extrusion preferably.
Same model bent axle described in the utility model means the bent axle that meets same technical standard, and described technical standard comprises all technical standards such as NBS, industry standard and company standard.
Specifically, the WD615 Series Crankshaft of new structure of the present utility model is characterised in that, this bent axle is made with spheroidal graphite cast iron, compares with the forged steel WD615 Series Crankshaft of same model, and the diameter of its free end front end diameter of axle and the diameter of the inner end diameter of axle increase 2-5mm respectively.
The feature of this WD615 series ductile iron crankshaft also is, its crankweb is symmetrically overhanging to the left and right biconvex ear shape, the Extreme breadth at the biconvex ear place of this crankweb is compared with the Extreme breadth of the corresponding site of the forged steel WD615 Series Crankshaft of same model, has increased 25-35mm.
The feature of this WD615 series ductile iron crankshaft also is, compare with the forged steel WD615 Series Crankshaft of same model, the knuckle radius of its free end and main journal joint increases 2-5mm, and the knuckle place at main journal and connecting rod neck place also handles through roll extrusion.
New type crank of the present utility model adopts the reason of spheroidal graphite cast iron manufacturing to be that spheroidal graphite cast iron has the favorable mechanical performance, and good wear resistance is especially arranged, and itself contained graphite just has good lubricity.After graphite split away off from the matrix of foundry goods, the hole that it stays also stored lubricant oil.But compare with forged steel, the ability of its counter-bending fatigue is slightly poor.Therefore, have the mechanical property identical, then must do following improvement at the weakness of its structure with forged steel crankshaft for guaranteeing ductile iron crankshaft:
1. the free end of bent axle withstands shocks and stress alternation, and it still is a cantilever structure simultaneously.For strengthening the ability that it resists flexural fatigue, the utility model people with the diameter of the free-ended front end diameter of axle of this ductile iron crankshaft than and this diameter of the forged steel crankshaft of same model increase 7%-12%, with the diameter of the free-ended inner end of this ductile iron crankshaft diameter of axle than and this diameter of the forged steel crankshaft of same model increase 4%-8%.
2. with the free end of novel ductile iron crankshaft of the present utility model and the knuckle radius at main journal place, knuckle radius than this place of the forged steel crankshaft of same model increases 40%-60%, concentrate susceptibility with the stress that reduces this place, and then strengthen the ability of the counter-bending fatigue at this place.For further strengthening the ability of the counter-bending fatigue at this knuckle place and main journal, connecting rod neck knuckle place, also can do to surpass the roll extrusion processing of crankshaft material yield limit to this place, make the metal at this position produce compressive residual stress by top layer to deep layer, to produce the compensation stress of low value in the depths, thereby can partly offset bent axle suffered tensile stress of when work, further improve the fatigue strength at this place of bent axle.
3. the crankweb position with the utility model ductile iron crankshaft is designed to the overhanging biconvex ear shape in the left and right sides symmetrically, so that the Extreme breadth of this biconvex ear position is than the Extreme breadth increase 20%-24% of the corresponding site of the forged steel crankshaft of same model.By strengthening this size, can make the corresponding within the specific limits increasing of module of anti-bending section at this place of bent axle, the result also strengthens its resistance to flexure within the specific limits, and the bending resistance at this position is strengthened.
Ductile iron crankshaft of the present utility model makes that because of the improvement on said structure and the size weak part of this bent axle is strengthened, and its performance can be compared favourably with the forged steel crankshaft of same model.
In addition, also can make ionic nitrizing treatment, make its surface form wear-resisting, the anticorrosion layer that one deck is made up of nitrided iron and cementite, with the comprehensive mechanical performance of further this ductile iron crankshaft of raising to the surface of this ductile iron crankshaft.The conventional spheroidal graphite cast iron that can be used for making bent axle all is suitable for making new type crank of the present utility model.The utility model recommends to adopt the following spheroidal graphite cast iron of chemical composition:
C:3.8%-3.99%, Si:2.0%-2.4%, Mn:0.4%-0.5%, P: be less than or equal to 0.07%, S: be less than or equal to: Cu:0.5-0.6% 0.035%.
The spheroidal graphite cast iron of mentioned component carries out spheroidizing with Re:Mg＞1 rare earth magnesium; Foundry goods is done normalizing stage by stage, can reach the performance that is higher than QT800-3 spheroidal graphite cast iron.
Description of drawings
Fig. 1 is a ductile iron crankshaft structural representation of the present utility model.
Fig. 2 be Fig. 1 A-A to the amplification schematic cross-section.
Fig. 3 is the free-ended local enlarged diagram among Fig. 1.
Further specify the utility model below by embodiment.
Embodiment
Embodiment 1
Use induction furnace melting cast iron, this cast iron chemical composition after the rare earth magnesium spheroidizing of Re:Mg＞1 is as follows:
C：3.91％、Si：2.3％、Mn：0.48％、P：0.03％、S：2％、Cu：0.55％。
To cast the WD615 crank shaft blank through the spheroidal graphite cast iron of above-mentioned processing, its nodulizing grade is that 2 grades, 6 grades of sphere diameters, content of pearlite in alloy are 91%.
Above-mentioned blank carries out normalizing stage by stage: 910-920 ℃ of insulation 30 minutes after machining; Stove is chilled to 820 ℃, is incubated 1 hour; Air-cooled after coming out of the stove.
The size of bent axle after the machining, the diameter d 1 of the preceding end journal 11 of its free end 1 and the diameter d 2 of inner end axle journal 12 are respectively 52.4mm and 53mm, compare with the forged steel crankshaft of same model, the diameter of preceding end journal 11 increases 9.2%, and the diameter of inner end axle journal 12 increases 6%; Its crankweb 4 has symmetrically overhanging to the left and right biconvex ear 41, and the Extreme breadth L of the biconvex ear 41 of crankweb 4 is 159mm, and the Extreme breadth L between this biconvex ear increases 22% than the Extreme breadth of the forged steel crankshaft crankweb corresponding site of same model; Through the free end 1 of roll extrusion processing and the knuckle radius of main journal 2 joints is 6mm, compares with the forged steel crankshaft of same model, increases 50%; All the other sizes and WD615 series forged steel crankshaft measure-alike.
Can make nitrogen ion aura to this bent axle surface at last handles.
Ductile iron crankshaft of the present utility model has strengthened weak part owing to improved structure and size, the ability of its counter-bending fatigue is improved, thereby has satisfied user's technical requirements comprehensively.The operating life of the operating life that practice shows ductile iron crankshaft of the present utility model and the 45# steel of same model or 42CrMo forging steel crank shaft is identical or than its height slightly.
Claims (2)
1. an engine ductile iron crankshaft is characterized in that, this bent axle is made with spheroidal graphite cast iron, compares with the forged steel crankshaft of same model, and the diameter of end journal increased 7%-12% before it was free-ended; The diameter of its inner end axle journal increases 4-8%; Its crankweb is symmetrically overhanging to the left and right biconvex ear shape, and the Extreme breadth between this biconvex ear is than the Extreme breadth increase 20-24% of the forged steel crankshaft crankweb corresponding site of same model.
2. engine ductile iron crankshaft as claimed in claim 1 is characterized in that, the free end of this bent axle is compared with the forged steel crankshaft of same model with the knuckle radius of main journal joint, increases 40%-60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201518117U CN201057216Y (en) | 2007-06-12 | 2007-06-12 | Nodular cast iron crankshaft of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201518117U CN201057216Y (en) | 2007-06-12 | 2007-06-12 | Nodular cast iron crankshaft of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201057216Y true CN201057216Y (en) | 2008-05-07 |
Family
ID=39426058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201518117U Expired - Lifetime CN201057216Y (en) | 2007-06-12 | 2007-06-12 | Nodular cast iron crankshaft of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201057216Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100580260C (en) * | 2007-06-12 | 2010-01-13 | 天润曲轴股份有限公司 | Nodular cast iron crankshaft of engine |
| CN102200166A (en) * | 2010-03-25 | 2011-09-28 | 广西玉柴机器股份有限公司 | Nodular cast iron crankshaft and its manufacturing method |
| CN106541063A (en) * | 2016-11-25 | 2017-03-29 | 广西科技大学 | A kind of high-strength ductile cast iron forging method |
-
2007
- 2007-06-12 CN CNU2007201518117U patent/CN201057216Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100580260C (en) * | 2007-06-12 | 2010-01-13 | 天润曲轴股份有限公司 | Nodular cast iron crankshaft of engine |
| CN102200166A (en) * | 2010-03-25 | 2011-09-28 | 广西玉柴机器股份有限公司 | Nodular cast iron crankshaft and its manufacturing method |
| CN106541063A (en) * | 2016-11-25 | 2017-03-29 | 广西科技大学 | A kind of high-strength ductile cast iron forging method |
| CN106541063B (en) * | 2016-11-25 | 2018-10-12 | 广西科技大学 | A kind of high-strength ductile cast iron forging method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070612 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070612 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |