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Nodular cast iron cylinder sleeve and manufacturing method thereof

A technology of nodular cast iron and cylinder liners, which is applied in the direction of cylinders, engine components, mechanical equipment, etc., can solve the problems of high performance, low emission, long life, high power internal combustion engine, complex preparation process, etc., and achieve good wear reduction performance, preparation The effect of simple process and high production efficiency

Active Publication Date: 2015-07-22
YANGZHOU WUTINGQIAO CYLINDER LINER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a ductile iron cylinder liner and its manufacturing method, which overcomes the defects that the existing ductile iron cylinder liners cannot meet the requirements of contemporary high-performance, low-emission, long-life, high-power internal combustion engines, and the preparation process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Ductile iron cylinder liner, its chemical composition mass percentage is: carbon 3.63%, silicon 2.17%, manganese 0.72%, phosphorus ≤ 0.08%, sulfur ≤ 0.03%, chromium ≤ 0.08%, molybdenum 0.31%, nickel 1.08%, copper 0.17% , the balance being Fe.

[0023] The preparation method of the ductile iron cylinder liner includes a batching process, a smelting process, a spheroidizing inoculation process, and a pouring process:

[0024] (1) The batching process: the charge is 3500 kilograms of pig iron, 1500 kilograms of steel scrap; 53 kilograms of ferrosilicon, 28 kilograms of ferromanganese, 31 kilograms of ferromolybdenum, 54 kilograms of nickel, and 9 kilograms of copper.

[0025] (2) In the smelting process: weigh according to the ingredient list, adopt a step-by-step feeding method, first add pig iron, then add scrap steel, feed while melting, and finally add alloy, when the temperature of molten iron reaches 1435 ° C, take a chemical analysis sample, The molten iron is smel...

Embodiment 2

[0031] Ductile iron cylinder liner, its chemical composition mass percentage is: carbon 3.73%, silicon 2.28%, manganese 0.77%, phosphorus ≤ 0.08%, sulfur ≤ 0.03%, chromium ≤ 0.08%, molybdenum 0.40%, nickel 0.97%, copper 0.14% , the balance being Fe.

[0032] The preparation method of the ductile iron cylinder liner includes a batching process, a smelting process, a spheroidizing inoculation process, and a pouring process:

[0033] (1) The batching process: the charge is 4000 kilograms of pig iron, 1000 kilograms of steel scrap; 60 kilograms of ferrosilicon, 41 kilograms of ferromanganese, 40 kilograms of ferromolybdenum, 49 kilograms of nickel, and 7 kilograms of copper.

[0034] (2) In the smelting process: weigh according to the ingredient list, adopt a step-by-step feeding method, add pig iron first, then add scrap steel, feed while melting, and finally add alloy, when the temperature of molten iron reaches 1407 ° C, take a chemical analysis sample, The molten iron is smel...

Embodiment 3

[0040] Ductile iron cylinder liner, its chemical composition mass percentage is: carbon 3.87%, silicon 2.03%, manganese 0.88%, phosphorus ≤ 0.08%, sulfur ≤ 0.03%, chromium ≤ 0.08%, molybdenum 0.47%, nickel 0.93%, copper 0.12% , the balance being Fe.

[0041] The preparation method of the ductile iron cylinder liner includes a batching process, a smelting process, a spheroidizing inoculation process, and a pouring process:

[0042](1) The batching process: the charge is 3750 kilograms of pig iron, 1250 kilograms of steel scrap; 37 kilograms of ferrosilicon, 44 kilograms of ferromanganese, 48 kilograms of ferromolybdenum, 46 kilograms of nickel, and 6 kilograms of copper.

[0043] (2) In the smelting process: weigh according to the batching list, adopt a step-by-step feeding method, add pig iron first, then add scrap steel, feed while melting, and finally add alloy, when the temperature of molten iron reaches 1359 ° C, take a chemical analysis sample, The molten iron is smelted...

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Abstract

The invention relates to a nodular cast iron cylinder sleeve and a manufacturing method of the nodular cast iron cylinder sleeve. The nodular cast iron cylinder sleeve comprises the following chemical ingredients in percent by mass: 3.6-3.9% of carbon, 2.0-2.3% of silicon, 0.7-0.9% of manganese, not greater than 0.08% of phosphorus, not greater than 0.02% of sulphur, not greater than 0.08% of chromium, 0.3-0.5% of molybdenum, 0.9-1.1% of nickel, 0.1-0.2% of copper, and the balance of Fe. The material proportioning of the nodular cast iron cylinder sleeve and the preparation method of the nodular cast iron cylinder sleeve can meet the requirement of high explosion pressure on an engine at present and in future; moreover, the cost is low.

Description

technical field [0001] The invention relates to a nodular cast iron cylinder liner and a manufacturing method thereof, in particular to a nodular cast iron cylinder liner capable of meeting high burst pressure and a manufacturing method thereof. Background technique [0002] At present, domestic cylinder liners are mostly made of gray cast iron. The graphite in gray cast iron is mainly flake graphite, and the tip of flake graphite is sharp, which severely splits the matrix. When it is under load, it is prone to stress concentration. Decrease the strength and rigidity of the cylinder liner. Graphite in ductile iron is distributed in a spherical shape, which not only causes less stress concentration, but also has the least splitting effect on the matrix. The ductile iron cylinder liner can meet the requirements of high explosion pressure of the engine now and in the future, and the cost is low. Contents of the invention [0003] The technical problem to be solved by the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/10F16J10/04
Inventor 缪兴平夏园范金龙顾益祥夏传斌张树梅
Owner YANGZHOU WUTINGQIAO CYLINDER LINER