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Method for producing austempered ductile iron (ADI) cylinder sleeve

A production method and cylinder liner technology, applied in the field of ADI supercharged engine cylinder liner and production, can solve problems such as poor emission index, fatigue performance and wear resistance that cannot meet the requirements of high-enhanced engine service, and environmental impact.

Active Publication Date: 2012-07-04
扬州华铁机电集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such bad emission indicators have seriously affected the environment and caused a waste of energy.
[0003] Materials currently in service: boron cast iron, boron-copper cast iron, chrome-molybdenum-copper cast iron, high-phosphorus alloy cast iron, high-phosphorus cast iron, high-content chromium-molybdenum-nickel cast iron, and chromium-molybdenum-copper-boron alloy cast iron. Requirements for Strengthening Engine Service

Method used

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  • Method for producing austempered ductile iron (ADI) cylinder sleeve
  • Method for producing austempered ductile iron (ADI) cylinder sleeve

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Experimental program
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Effect test

Embodiment Construction

[0015] 1. Production steps:

[0016] 1. Pouring ADI cylinder liner slab:

[0017] Select synthetic cast iron or high-purity nodular iron pig iron carbonized by scrap steel as the main metal material for the production of ADI cylinder liners, and strictly control the addition of alloying elements; melt molten iron in an intermediate frequency electric furnace, purify the molten iron by blowing argon; 1480 ~ 1560 ° C, Spheroidization treatment and secondary inoculation treatment are adopted.

[0018] Addition of alloying elements (%), the rest is Fe:

[0019] C Si mn P S Mg Re 3.1-3.9 2.0-3.0 ＜0.31 ＜0.03 ＜0.02 0.039-0.062 ≥0.02

[0020] 2. Analysis: The number of graphite nodules of the formed ADI (rare earth Aubey ductile iron) cylinder liner slab is grade 1-4 of GB9441-88; the size of graphite is grade 5 not thicker than GB9441-88; the matrix structure The total amount of medium phosphorus eutectic cementite is ≤5%; the ratio of pearlite and ...

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Abstract

The invention discloses a method for producing an austempered ductile iron (ADI) cylinder sleeve, belongs to metal materials, and in particular relates to the technical field of production processes for ADI supercharged engine cylinder sleeves. The method comprises the steps of casting an ADI cylinder sleeve casting blank, finely machining the cylinder sleeve casting blank, performing isothermal quenching treatment and shot blasting treatment and machining platform reticulate patterns. The method solves the problem that the fatigue property and the abrasion resistance of the conventional service materials such as boron cast iron, boron-copper cast iron, chromium-molybdenum-copper cast iron, high-phosphorus alloy cast iron, high-phosphorus cast iron, high-content chromium-molybdenum-nickel cast iron and chromium-molybdenum-copper-boron alloy cast iron cannot meet the service requirements of high strength engines.

Description

technical field [0001] The invention relates to metal materials, in particular to an ADI (Austempering Ductile Iron) supercharged engine cylinder liner and the technical field of production. Background technique [0002] In the prior art, engine cylinder liners are made of boron cast iron, boron-copper cast iron, chrome-molybdenum-copper cast iron, high-phosphorus alloy cast iron, high-phosphorus cast iron, high-content chromium-molybdenum-nickel cast iron, chromium-molybdenum-copper-boron alloy cast iron, etc. The internal surface hardening of the cylinder liner adopts soft nitriding, laser, surface high-frequency quenching, chrome plating and other heat treatment processes, or the inner surface of the body (hardness HB207~360) is equipped with platform honing texture or soft nitriding (the compound layer is only 0.030mm ) After platform honing reticulation, when the surface hardening layer is worn off, the inner wall of the cylinder liner with a non-round matrix structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 徐志富臧权同王克宇徐帅
Owner 扬州华铁机电集团有限公司
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