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Vermiculizer for producing vermicular cast iron cylinder sleeve by centrifugal casting and preparation method thereof

A technology of vermicular cast iron and centrifugal casting, which is applied in the field of centrifugal casting to produce vermicular cast iron cylinder liner and the field of preparation thereof, can solve the problems that cannot meet the production requirements of centrifugal casting vermicular graphite cast iron cylinder liner, etc. Narrow layer and creep range, obvious effect, easy to use effect

Active Publication Date: 2012-12-05
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing commercial vermicular agents can not meet the production requirements of centrifugal casting vermicular graphite cast iron cylinder liner

Method used

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  • Vermiculizer for producing vermicular cast iron cylinder sleeve by centrifugal casting and preparation method thereof
  • Vermiculizer for producing vermicular cast iron cylinder sleeve by centrifugal casting and preparation method thereof
  • Vermiculizer for producing vermicular cast iron cylinder sleeve by centrifugal casting and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The RE (rare earth) in the vermicular agent is pure lanthanum, RE: Mg=6, Mg is 3.5% (mass percentage, the same below), Ca is 2.5%, Ba is 1%, Al is 1.8%, and Si content is 45% , the balance is iron; the amount of vermicular agent added is 0.6% of the mass of molten iron, the graphite of the cylinder liner obtained by centrifugal casting is evenly distributed throughout the cross-section, the creep rate of the inner wall and outer wall is greater than 85%, the matrix is ​​pearlite, and the tensile strength Rm is 530N / mm 2 , the hardness HBW10 / 3000 is 276. The corresponding metallographic structure is as attached figure 1 shown.

Embodiment 2

[0024] RE in the vermicularizing agent is lanthanum-rich mixed rare earth, RE: Mg=8.3, Mg is 2.5%, Al is 1.5%, Si content is 40%, and the balance is iron; the adding amount of vermicularizing agent is 0.7%, obtained by centrifugal casting Graphite is evenly distributed throughout the section of the cylinder liner, the creep rate of the inner and outer walls is greater than 85%, the matrix is ​​pearlite, and the tensile strength Rm is 590N / mm 2 , the hardness HBW10 / 3000 is 270. The corresponding metallographic structure is as attached figure 2 shown.

Embodiment 3

[0026] RE in the vermicular agent is pure lanthanum, RE: Mg=9.0, Mg is 3.0%, Ca is 4%, Ba is 1.5%, Al is 2.5%, Si content is 42%, and the balance is iron; the vermicular agent is added The graphite content is 0.8%, the graphite distribution of the cylinder liner obtained by centrifugal casting is uniform, the creep rate of the inner wall and the outer wall is greater than 85%, the matrix is ​​pearlite, and the tensile strength Rm is 610N / mm 2 , the hardness HBW10 / 3000 is 270. The corresponding metallographic structure is as attached image 3 shown.

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Abstract

The invention relates to a vermiculizer for producing vermicular cast iron, in particular to the vermiculizer for producing a vermicular cast iron cylinder sleeve by centrifugal casting and a preparation method thereof. The vermiculizer comprises the following components in percentage by weight: 20 to 36 percent of rare earth, 2 to 5 percent of magnesium, 0 to 4 percent of calcium, 0 to 3 percentof barium, 0 to 4 percent of aluminum, 40 to 45 percent of silicon and the balance of iron, wherein the rare earth is lanthanum or rich-lanthanum mixed rare earth; and the ratio of the rare earth to the magnesium is 5-12:1. The vermiculizer can stably produce the vermicular cast iron with the vermiculation rate of not less than 80 percent and the substrate of pearlite or bainite, is simple to use, has remarkable effects and stable vermiculation, and overcomes the shortcomings of section layering and narrow vermiculation range of castings in a vermiculation process.

Description

(1) Technical field [0001] The invention relates to a vermicular agent for producing vermicular graphite cast iron, in particular to a vermicularizing agent for producing vermicular graphite cast iron cylinder liners by centrifugal casting and a preparation method thereof. (2) Background technology [0002] The cylinder liner is one of the key parts of the engine. At present, its material is mostly ordinary gray cast iron or alloy gray cast iron. This type of cylinder liner mainly depends on the reduction of carbon equivalent and alloy strengthening to meet the requirements of strength and wear resistance. The tensile strength is generally below 300MPa, and the strength and wear resistance are poor, which cannot meet the requirements of energy saving and consumption reduction for high-power engines. , Development requirements for emission reduction. The graphite form of vermicular graphite cast iron is between flake graphite and spherical graphite, and it is worm-like. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C33/06
Inventor 刘胜新侯起飞孙玉福孙华为杨娟乔宇鹏
Owner ZYNP GRP
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