CN1676649A - Casting method suitable for large-section ADI crank shaft - Google Patents
Casting method suitable for large-section ADI crank shaft Download PDFInfo
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- CN1676649A CN1676649A CN 200510039025 CN200510039025A CN1676649A CN 1676649 A CN1676649 A CN 1676649A CN 200510039025 CN200510039025 CN 200510039025 CN 200510039025 A CN200510039025 A CN 200510039025A CN 1676649 A CN1676649 A CN 1676649A
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- adi
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- casting method
- crank shaft
- iron
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Abstract
This invention is a casting method suitable for big-section ADI crank, and relates to a casting method of nodular cast iron crank. The iron melt contains C, Si, Mn, Cu, Ni. This invention is in the controlling range of conventional five elements, add microelements Cu, Ni after devulcanizing in front of the furnace, pour the iron melt into the mould and cool it to proper temperature and decrating treatment to convert to the following procedure. The strong points of this invention are: reasonable match of alloy elements, the adding amount is less, the chemical components are reasonable and ensure the quenching performance; the mould make the graphite expansion become self contraction to make the structure delicate, the crystal thin and the yield up to 80%, the cost is low, the performance is stable and provide conditions for ideal mechanism.
Description
Technical field:
The present invention relates to a kind of Spheroidal Graphite Crankshaft Foundry method.
Background technology:
One of measure that improves engine output from structure design is that cylinder is expanded in supercharging, thus the performance of bent axle has been proposed the new demand, particularly large-section ADI crank shaft of high-intensity high-tenacity.Ductile iron crankshaft routine casting method product yield normally is about 60% both at home and abroad at present, production cost height, traditional performance: tensile strength is generally 800MPA, unit elongation is about 4%, and stability is poor, the extremely incompatible performance requriements of engine crankshaft at present.
Summary of the invention:
The objective of the invention is to study a kind of castmethod that is applicable to large-section ADI crank shaft, make it to adapt to the particular requirement of high-performance ductile iron crankshaft following process.
When order of the present invention is cast at bent axle spheroidal graphite cast iron, contain C, Si, Mn, Cu, Ni in the molten iron.
Each composition difference C 3.6～3.9%, Si 2.4～3.0%, Mn 0.2～0.4%, P＜0.04%, S＜0.02%, Cu 0.4～0.8%, Ni 1.2～1.8% in the above-mentioned molten iron; Molten iron pours into cooling forming in the die cavity of Iron Mould Coated Sand between 1350～1400 degree.
The present invention by add trace alloying element Cu, Ni etc. after stokehole desulfuration, pours into molten iron in the casting mold of Iron Mould Coated Sand in conventional five big element span of control, is cooled to outlet cleaning after certain temperature, changes later process over to and processes.
Advantage of the present invention is: after alloying element reasonably combined, add-on reduces, and the Chemical Composition reasonable ratio guarantees the hardening capacity of isothermal quenching; Can realize when the Iron Mould Coated Sand casting mold makes graphitization expansion from feeding, thereby make dense structure, grain refining, product yield reach 80%, production cost is low, stability good, for the final ideal mechanical property that obtains provides condition.
Embodiment:
Adopt cupola furnace-electric furnace double melting, frequency conversion bag-rocking desulfurizing, each Chemical Composition is at following scope: C 3.6～3.9% in the control molten iron; Si 2.4～3.0%; Mn 0.2～0.4%; P＜0.04%; S＜0.02%; Cu 0.4～0.8%; Ni 1.2～1.8%, then satisfactory molten iron poured into cooling forming in the die cavity of Iron Mould Coated Sand between 1350～1400 degree, form large-section ADI crank shaft, after testing, the unit elongation of bent axle 〉=9%, tensile strength reaches 900Mpa.
Claims (3)
1, a kind of castmethod that is applicable to large-section ADI crank shaft is characterized in that containing C, Si, Mn, Cu, Ni in the molten iron when bent axle spheroidal graphite cast iron is cast.
2, according to the described castmethod that is applicable to large-section ADI crank shaft of claim 1, it is characterized in that containing in the molten iron C 3.6～3.9%, Si 2.4～3.0%, Mn 0.2～0.4%, P＜0.04%; S＜0.02%, Cu 0.4～0.8%, Ni 1.2～1.8%.
3,, it is characterized in that molten iron pours into cooling forming in the die cavity of Iron Mould Coated Sand between 1350～1400 degree according to the described castmethod that is applicable to large-section ADI crank shaft of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510039025 CN1676649A (en) | 2005-04-22 | 2005-04-22 | Casting method suitable for large-section ADI crank shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510039025 CN1676649A (en) | 2005-04-22 | 2005-04-22 | Casting method suitable for large-section ADI crank shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1676649A true CN1676649A (en) | 2005-10-05 |
Family
ID=35049396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510039025 Pending CN1676649A (en) | 2005-04-22 | 2005-04-22 | Casting method suitable for large-section ADI crank shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1676649A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131937A (en) * | 2013-01-28 | 2013-06-05 | 天津万立鑫晟新材料技术研究院有限公司 | Carbide-containing isothermal quenching nodular cast iron and preparation method thereof |
-
2005
- 2005-04-22 CN CN 200510039025 patent/CN1676649A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131937A (en) * | 2013-01-28 | 2013-06-05 | 天津万立鑫晟新材料技术研究院有限公司 | Carbide-containing isothermal quenching nodular cast iron and preparation method thereof |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |