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Manufacturing method of vermicular cast iron piston ring

A technology of vermicular graphite cast iron and a manufacturing method, which is applied in the directions of piston rings, manufacturing tools, casting and molding equipment, etc., can solve the problems of increasing the production cost of ductile iron piston rings, poor wear resistance of ductile iron, and difficult processing of piston rings, etc. The effect of low wear resistance and toughness, and high comprehensive yield

Inactive Publication Date: 2013-12-18
SHIJIAZHUANG JINGANG KAIYUAN POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the piston ring becomes thinner with the development of the engine, especially the height of the first and second rings changes from the original 3mm to 1-1.5mm, which makes the piston ring made of traditional gray cast iron material thinner in height It becomes difficult to process in the future, and it is easy to break or even chip during use
At present, the piston ring materials in the industry are produced not only by gray cast iron, but also by ductile iron. Due to the poor wear resistance of ductile iron, in order to improve the mechanical properties of ductile iron piston rings, the piston rings produced by ductile iron are machined. Finally, chrome plating is generally required, and the process of chrome plating is complicated, and the reject rate is high, which increases the production cost of nodular cast iron piston rings.

Method used

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  • Manufacturing method of vermicular cast iron piston ring
  • Manufacturing method of vermicular cast iron piston ring
  • Manufacturing method of vermicular cast iron piston ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A vermicular graphite cast iron piston ring. High-quality raw materials are selected for raw material proportioning. The design targets for the chemical components and weight percentages in the piston ring are: C: 3.7% to 3.8%, Si: 2.6% to 2.8%, Mn: 0.1%~0.2%, Cr: 0.25%~0.3%, Mo: 0.35%~0.45%, Cu: 0.55%~0.6%, Ti: 0.1%~0.15%, P≤0.08%, S≤ 0.03%, Mg: 0.011% ~ 0.015%, the rest is Fe and unavoidable impurities.

[0037] The manufacture method of compacted graphite cast iron piston ring comprises the following steps:

[0038] A. Use a special template for molding, that is, make sand molds on a pneumatic vibration molding machine, and then place the prepared sand molds at the pouring station. Dedicated templates such as figure 1As shown, it includes a bottom plate 1 , four piston ring models fixed on the bottom plate 1 , and a pouring system arranged on the bottom plate 1 . The gating system mainly includes a sprue 2 , a runner 3 and an inrunner 4 . The sprue 2 is arranged ...

Embodiment 2

[0054] Processing condition in the present embodiment, manufacturing method are identical with embodiment 1, and the difference with embodiment 1 is:

[0055] The design target of the chemical composition and the weight percent content in the vermicular graphite cast iron piston ring in the present embodiment is:

[0056] C: 3.6%~3.7%, Si: 2.6%~2.7%, Mn: 0.1%~0.3%, Cr: 0.2%~0.3%, Mo: 0.25%~0.3%, Cu: 0.55%~0.6%, Ti: 0.1%~0.15%, P≤0.08%, S≤0.03%, Mg: 0.011%~0.015%, the rest is Fe and unavoidable impurities.

[0057] Carry out chemical composition analysis to the compacted graphite cast iron piston ring blank that step B obtains, the chemical composition and weight percentage in the obtained piston ring are:

[0058] C: 3.6%, Si: 2.6%, Mn: 0.2%, Cr: 0.2%, Mo: 0.3%, Cu: 0.55%, Ti: 0.1%, P: 0.08%, S: 0.03%, Mg: 0.015%.

[0059] In this embodiment, by adjusting the chemical components in the material and using a reasonable casting production process, the hardness of the vermicular...

Embodiment 3

[0062] Processing condition in the present embodiment, manufacturing method are identical with embodiment 1, and the difference with embodiment 1 is:

[0063] The design target of the chemical composition and the weight percent content in the vermicular graphite cast iron piston ring in the present embodiment is:

[0064] C: 3.7%~3.8%, Si: 2.7%~2.8%, Mn: 0.1%~0.3%, Cr: 0.2%~0.3%, Mo: 0.35%~0.45%, Cu: 0.65%~0.7%, Ti: 0.05%~0.1%, P≤0.1%, S≤0.05%, Mg: 0.011%~0.015%, the rest is Fe and unavoidable impurities.

[0065] Carry out chemical composition analysis to the compacted graphite cast iron piston ring blank that step B obtains, the chemical composition and weight percentage in the obtained piston ring are:

[0066] C: 3.75%, Si: 2.75%, Mn: 0.15%, Cr: 0.24%, Mo: 0.4%, Cu: 0.7%, Ti: 0.05%, P: 0.08%, S: 0.05%, Mg: 0.02%.

[0067] In this embodiment, by adjusting the chemical components in the material and using a reasonable casting production process, the hardness of the vermicu...

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Abstract

The invention discloses a manufacturing method of a vermicular cast iron piston ring. The material of the vermicular cast iron piston ring comprises the following chemical components in percentage by weight: 3.4-4.0% of C, 2.4-3.2% of Si, not more than 0.3% of Mn, 0.2-0.4% of Cr, 0.2-0.6% of Mo, 0.5-1.0% of Cu, 0.05-0.15% of Ti, not more than 0.1% of P, not more than 0.05% of S, 0.009-0.02% of Mg and the balance of Fe and inevitable impurities. The manufacturing method of the vermicular cast iron piston ring comprises the following technical steps of moulding, smelting, casting, shaking out, shot blasting, mechanical processing, surface treatment and the like. By adopting the manufacturing method disclosed by the invention, the thinning of the piston ring is achieved, the production process is relatively simple, and the manufactured vermicular cast iron piston ring is high in elasticity, strength, toughness and wear resistance.

Description

technical field [0001] The invention relates to a method for manufacturing internal combustion engine parts, in particular to a method for manufacturing cast iron piston rings. Background technique [0002] An internal combustion engine is a widely used power mechanical device, which is a heat engine that directly converts the released heat energy into kinetic energy through the combustion of fuel inside the machine. Piston rings are one of the key components in an internal combustion engine. As the engine develops in the direction of small size, light weight, high speed, high power, low emission, low fuel consumption, low cost, wear resistance, and environmental protection, the design requirements of piston rings are also increasingly trending towards light weight, high strength, high Develop in the direction of elasticity, low friction, low cost, wear resistance, and environmental protection. [0003] Piston rings play a role in sealing the combustion chamber and crankca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/06C22C33/08B22C9/22B22D1/00C21D5/00F16J9/26
Inventor 王季明刘津东张彩霞王焕平
Owner SHIJIAZHUANG JINGANG KAIYUAN POWER SCI & TECH
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