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Piebald cylinder sleeve for centrifugal casting production and production technology of piebald cylinder sleeve

A technology of centrifugal casting and production process, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of high cost, low strength, poor plasticity, etc., and achieve the effect of overcoming poor oil storage and good wear reduction performance.

Active Publication Date: 2016-03-02
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high cost, complicated process control and limited effect of such measures, gray cast iron cylinder liners are mainly used at present, which have the disadvantages of low strength, poor plasticity, poor oil storage and long running-in period with the piston

Method used

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  • Piebald cylinder sleeve for centrifugal casting production and production technology of piebald cylinder sleeve
  • Piebald cylinder sleeve for centrifugal casting production and production technology of piebald cylinder sleeve
  • Piebald cylinder sleeve for centrifugal casting production and production technology of piebald cylinder sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A mottled cylinder liner produced by centrifugal casting, the composition weight percentage of the mottled cylinder liner is as follows: C3.5-3.9, Si2.6-3.0, P<0.02,

[0027] Cu0.7~0.9, Ni0.2~0.4, Bi0.04~0.08, Nb0.1~0.3,

[0028] Mg0.03~0.06, Ce0.02~0.04, the balance is iron;

[0029] like figure 1 figure 2 image 3 As shown, the number of spheroidal graphites observed in the spotted cylinder liner is at least 200 when the diameter of the field of view is 70 mm, the diameter of the spheres is 10 to 30 microns, and the distribution is uniform. The matrix organization of the spotted cylinder liner is granular pearlite. The hardness of the spotted cylinder liner is 220-300HBW. After the inner hole of the mottled cylinder liner undergoes fine grinding and polishing in sequence, a mottled-like surface alloy layer with a thickness of 0.2 microns is formed.

[0030] The performance of the mottled cylinder liner is that the hardness is 220-300HBW, the tensile strength is...

Embodiment 2

[0039] The blank is produced by the water-cooled metal mold centrifugal casting method, and its composition in weight percentage (%) is as follows: C: 3.80-3.90, Si: 2.6-2.8, P: <0.1, S: <0.02, Ni: 0.2-0.3, Cu : 0.7-0.9, Bi0.04-0.08, Nb0.1-0.3%, residual Mg: 0.02-0.06, Ce: 0.02-0.04, the balance is iron;

[0040] Blank preparation process:

[0041] 1) Use 500Kg medium frequency induction furnace for smelting, smelting temperature is 1500℃-1550℃, and let the molten iron melt for 10 minutes; the primary inoculant is 75SiFe; the spheroidizing agent is FeSiMg6RE2; the secondary inoculant is silicon strontium.

[0042] 2) Use a single-station centrifugal pouring machine for pouring: pour the standing molten iron into a large ladle (dyke-type ladle) and place a nodularizing agent, a 75SiFe inoculant at the bottom of the ladle, and cover it with plant ash; Then transfer it into a fire ladle for pouring, and at the same time carry out secondary inoculation (spoon bottom inoculation),...

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Abstract

The invention discloses a piebald cylinder sleeve for centrifugal casting production and a production technology of the piebald cylinder sleeve. The piebald cylinder sleeve comprises, by weight percent, 3.5-3.9% of C, 2.6-3.0% of Si, smaller than 0.02% of P, 0.7-0.9% of Cu, 0.2-0.4% of Ni, 0.04-0.08% of Bi, 0.1-0.3% of Nb, 0.03-0.06% of Mg, 0.02-0.04% of Ce and the balance Fe. According to the high-performance spheroidal graphite cast iron cylinder sleeve, the amount of spheroidal graphite (the field diameter is 70 mm) is not smaller than 200, and the matrix structure is granular pearlite. Compared with the prior art, after finish grinding and polishing processes are sequentially conducted on inner holes of the cylinder sleeve obtained through the formula and the production technology, piebald-similar surface graphite and a WS2 alloy layer are formed on the surface layer, thus, honing of net stripes is not needed for the inner holes of the cylinder sleeve, oil storage performance, the lubricating property and the abrasion reducing performance are better, and the defects that a gray cast iron cylinder sleeve is poor in oil storage performance, long in run-in period with a piston, low in strength and poor in plasticity are overcome.

Description

technical field [0001] The invention relates to a mottled cylinder liner produced by centrifugal casting and a production process thereof, belonging to the technical field of engine parts production. Background technique [0002] The cylinder liner is one of the core parts of the engine. At present, improving its oil storage performance and reducing the running-in time with the piston mainly rely on improving the texture quality or other surface treatment methods. Due to the high cost, complicated process control and limited effect of such measures, gray cast iron cylinder liner is mainly used at present, which has the disadvantages of low strength, poor plasticity, poor oil storage and long running-in period with the piston. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the above deficiencies, and to provide a mottled cylinder liner produced by centrifugal casting and its production process, which are used to meet the high requireme...

Claims

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Application Information

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IPC IPC(8): C22C37/10B22D13/04C21D9/00
Inventor 张亮亮秦小才徐超姚涛殷建祥
Owner ZYNP GRP
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