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Double phase cast iron cylinder liner produced through centrifugal casting, and processing technology thereof

A technology of centrifugal casting and processing technology, which is applied in the field of heat treatment, can solve the problems of poor strength and wear resistance, and cannot meet the requirements of cylinder liner strength and wear resistance, etc., and achieve the effect of good thermal fatigue resistance and high strength

Active Publication Date: 2013-10-16
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 350MPa, and the strength and wear resistance are poor, which cannot meet the requirements of high-power machines for the strength and wear resistance of the cylinder liner. Abrasive requirements

Method used

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  • Double phase cast iron cylinder liner produced through centrifugal casting, and processing technology thereof
  • Double phase cast iron cylinder liner produced through centrifugal casting, and processing technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The weight percent composition of duplex cast iron cylinder liner is as follows: C: 3.83, Si: 2.2, P: 0.027, S: 0.022, Mn: 0.24, Cu: 1.25, Sn: 0.043, residual Mg: 0.029, Ce: 0.021, and the balance is iron.

[0015] The process of manufacturing the above-mentioned dual-phase cast iron cylinder liner produced by centrifugal casting, the steps are as follows:

[0016] 1) Casting: Casting temperature is 1400°C, centrifuge speed is 1200 rpm;

[0017] 2) Machining: process the cylinder liner blank into a semi-finished product, leaving a margin of 0.5mm for the inner hole and outer circle;

[0018] 3) Heat treatment: put the cylinder liner into a neutral atmosphere furnace at 920°C for austenitization for 1.5 hours, pre-cooling time T (second)=12+3*wall thickness of one side of the liner (mm), and then quench into 320°C In the nitrate salt bath, the isothermal time is 80min.

Embodiment 2

[0020] The weight percentage composition of the duplex cast iron cylinder liner is as follows: C: 3.80, Si: 2.80, P: 0.025, S: 0.02, Mn: 0.2, Cu: 1.2, Sn: 0.045, residual Mg: 0.022, Ce: 0.015, and the balance is iron.

[0021] The process of manufacturing the above-mentioned dual-phase cast iron cylinder liner produced by centrifugal casting, the steps are as follows:

[0022] 1) Casting: the casting temperature is 1420°C, and the centrifuge speed is 1300 rpm;

[0023] 2) Machining: process the cylinder liner blank into a semi-finished product, leaving a margin of 0.4mm for the inner hole and outer circle;

[0024] 3) Heat treatment: put the cylinder liner into a neutral atmosphere furnace at 920°C for austenitization for 1.5 hours, pre-cooling time T (second)=12+3*wall thickness of one side of the liner (mm), and then quench into 310°C In the nitrate salt bath, the isothermal time is 75min.

Embodiment 3

[0026] The weight percent composition of duplex cast iron cylinder liner is as follows: C: 3.90, Si: 2.5, P: 0.05, S: 0.03, Mn: 0.25, Cu: 1.3, Sn: 0.05, residual Mg: 0.03, Ce: 0.019, and the balance is iron.

[0027] The process of manufacturing the above-mentioned dual-phase cast iron cylinder liner produced by centrifugal casting, the steps are as follows:

[0028] 1) Casting: Casting temperature is 1450°C, centrifuge speed is 1400 rpm;

[0029] 2) Machining: process the cylinder liner blank into a semi-finished product, leaving a margin of 0.6mm for the inner hole and outer circle;

[0030] 3) Heat treatment: put the cylinder liner into a neutral atmosphere furnace at 920°C for austenitization for 1.5 hours, pre-cooling time T (second)=12+3*wall thickness of one side of the liner (mm), and then quench into 330°C In the nitrate salt bath, the isothermal time is 85min.

[0031] Such as figure 1 As shown, after heating in a neutral atmosphere and isothermal quenching, the ...

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Abstract

The invention discloses a double phase cast iron cylinder liner produced through centrifugal casting. The double phase cast iron cylinder liner comprises, by weight, 3.80-3.90% of C, 2.2-2.8% of Si, less than 0.1% of P, 0.02-0.03% of S, 0.2-0.25% of Mn, 1.2-1.3% of Cu, 0.04-0.05% of Sn, 0.01-0.03% of residual Mg, 0.02-0.03% of Ce, and the balance of Fe. According to the present invention, the cylinder liner is subjected to neutral atmosphere heating and isothermal salt bath quenching, such that the inner wall structure of the cylinder liner is ausferrite and vermicular graphite, the outer wall structure of the cylinder liner is ausferrite and spheroidal graphite, the whole performance strength achieves 950 MPa, and a hardness is greater than 320 HB. In addition, the cylinder liner of the present invention has advantages of high strength, good wear resistance, good abrasion resistance, and good thermal fatigue resistance compared with the conventional gray cast iron cylinder liner.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a dual-phase cast iron cylinder liner produced by centrifugal casting and a processing technology thereof. Background technique [0002] At present, the cylinder liner is mostly made of 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 350MPa, and the strength and wear resistance are poor, which cannot meet the requirements of high-power machines for the strength and wear resistance of the cylinder liner. Abrasive requirements. Contents of the invention [0003] In order to overcome the above-mentioned defects, the present invention provides a high-strength, high-wear-resistant and high-wear-resistant dual-phase cast iron cylinder liner produced by centrifugal casting and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C21D6/00C21D1/74C21D1/20C21D1/607
CPCY02P10/20
Inventor 张亮亮刘永峰李红杰尹艳娜
Owner ZYNP GRP
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