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High-performance air cylinder sleeve and production technology and surface treatment method of high-performance air cylinder sleeve

A technology of production process and treatment method, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve problems such as failure, poor performance, difficulty in meeting the strength requirements of high-performance engine cylinder liner, etc., to prevent The effect of carbon deposition, tensile strength and elastic modulus improvement

Active Publication Date: 2018-02-13
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As one of the main accessories of the engine, the cylinder liner is a key component of the A-level engine. Its performance directly affects the technical requirements of the engine's power, reliability, economy, emission, and noise. At present, the highest resistance to gray cast iron cylinder liners is The tensile strength is generally about 350MPa, which is difficult to meet the strength requirements of high-performance engines for cylinder liners
In addition, the existing gray cast iron cylinder liners generally have serious carbon deposits during use, and poor cavitation resistance, wear resistance, friction reduction, and thermal fatigue resistance.
Therefore, there is an urgent need to study high-strength, high-performance gray cast iron cylinder liners to solve the above problems of low strength, poor performance, or failure

Method used

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  • High-performance air cylinder sleeve and production technology and surface treatment method of high-performance air cylinder sleeve
  • High-performance air cylinder sleeve and production technology and surface treatment method of high-performance air cylinder sleeve
  • High-performance air cylinder sleeve and production technology and surface treatment method of high-performance air cylinder sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1) Composition design of the cylinder liner:

[0058] C 2.6, Si 3.15, P 0.5, S 0.05, Mn 1.8, Cu 1.7, Cr 0.6, Nb 0.65, and the balance is iron.

[0059] 2) Preparation of cylinder liner blanks:

[0060] The cylinder liner blank is produced by a water-cooled metal mold centrifugal casting method, the smelting temperature is 1450-1500° C., the smelted molten iron is left to stand for 15 minutes, and then inoculated. The inoculant used for the first inoculation is Ningxia Zhufeng 75SiFe, which is added in a downstream inoculation method. The amount added is 0.7% of the weight of molten iron, and the particle size is 1-2mm; the inoculant used for the second inoculation is Ningxia Zhufeng silicon strontium inoculation The mixture of silicon carbide inoculant and metallurgical silicon carbide (C content 28wt%, Si content 62wt%), the mass ratio of silicon strontium inoculant to metallurgical silicon carbide is 4:1. %, particle size 0.4 ~ 0.5mm. A single-station centrifugal p...

Embodiment 2

[0070] 1) Composition design of the cylinder liner:

[0071] C 2.56, Si 3.29, P 0.6, S 0.07, Mn 1.8, Cu 1.9, Cr 0.8, Nb 0.8, and the balance is iron.

[0072] 2) Preparation of cylinder liner blanks:

[0073] The cylinder liner blank is produced by a water-cooled metal mold centrifugal casting method, the smelting temperature is 1450-1500° C., the smelted molten iron is left to stand for 15 minutes, and then inoculated. The inoculant used for the first inoculation is Ningxia Zhufeng 75SiFe, which is added in a downstream inoculation method. The amount added is 0.7% of the weight of molten iron, and the particle size is 1-2mm; the inoculant used for the second inoculation is Ningxia Zhufeng silicon strontium inoculation The mixture of silicon carbide inoculant and metallurgical silicon carbide (C content 28wt%, Si content 62wt%), the mass ratio of silicon strontium inoculant to metallurgical silicon carbide is 4:1. %, particle size 0.4 ~ 0.5mm. A single-station centrifugal p...

Embodiment 3

[0083] Referring to Example 1 to prepare the cylinder liner, the only difference is that the surface treatment in step 3) is not performed after the blank is machined into a finished product.

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Abstract

The invention belongs to the field of air cylinder sleeves, and particularly relates to a high-performance air cylinder sleeve and a production technology and a surface treatment method of the high-performance air cylinder sleeve. The provided air cylinder sleeve comprises 2.3%-2.6% of C, 3.1%-3.4% of Si, 0.5%-0.8% of P, 0%-0.1% of S, 1.6%-1.9% of Mn, 1.7%-1.9% of Cu, 0.5%-0.9% of Cr, 0.6%-1.0% ofNb and the balance Fe. The provided surface treatment method comprises the steps that the surface of the above air cylinder sleeve is sequentially subjected to phosphating treatment and sulfur nitrogen carbon co-diffusion treatment, and the air cylinder sleeve obtained after surface treatment is obtained. The provided air cylinder sleeve has high tensile strength, and serious carbon deposition cannot happen during using. According to the provided surface treatment method, the mechanical strength of the air cylinder sleeve can be further improved, and the carbon deposition situation of the aircylinder sleeve during using is reduced; and meanwhile the cavitation erosion resistance, abrasion resistance and friction reduction performance of the air cylinder sleeve can be improved.

Description

technical field [0001] The invention belongs to the field of cylinder liners, in particular to a high-performance cylinder liner and its production process and surface treatment method. Background technique [0002] As one of the main accessories of the engine, the cylinder liner is a key component of the A-level engine. Its performance directly affects the technical requirements of the engine's power, reliability, economy, emission, and noise. At present, the highest resistance to gray cast iron cylinder liners is The tensile strength is generally about 350 MPa, which is difficult to meet the strength requirements of high-performance engines for cylinder liners. In addition, the existing gray cast iron cylinder liners generally have serious carbon deposits during use, and poor cavitation resistance, wear resistance, friction reduction, and thermal fatigue resistance. Therefore, there is an urgent need to study high-strength and high-performance gray cast iron cylinder line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C22C33/08C23C8/28C23C22/36B22D13/04
CPCB22D13/04C21D2211/005C21D2211/009C22C33/08C22C37/06C22C37/10C23C8/28C23C22/364
Inventor 张亮亮李海霞徐超曹红星张勇
Owner ZYNP GRP
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