A piebald cylinder liner produced by centrifugal casting and its production process

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

Active Publication Date: 2017-03-08
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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  • A piebald cylinder liner produced by centrifugal casting and its production process
  • A piebald cylinder liner produced by centrifugal casting and its production process
  • A piebald cylinder liner produced by centrifugal casting and its production process

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A piebald cylinder liner produced by centrifugal casting, the composition weight percentage of said piebald cylinder liner is as follows: C3.5~3.9, Si 2.6~3.0, P<0.02,

[0027] Cu 0.7~0.9, Ni 0.2~0.4, Bi 0.04~0.08, Nb 0.1~0.3,

[0028] Mg 0.03~0.06, Ce 0.02~0.04, the balance is iron;

[0029] Such as figure 1 figure 2 image 3 As shown, the mottled cylinder liner observes at least 200 spherical graphites when the diameter of the field of view is 70 mm, and the diameter of the balls is 10 to 30 microns, and they are evenly distributed. The matrix structure of the piebald cylinder liner is granular pearlite. The hardness of the piebald cylinder liner is 220-300HBW. After the inner hole of the piebald cylinder liner has been finely ground and polished in sequence, a 0.2 micron-thick surface alloy layer similar to piebald shape is formed.

[0030] The performance of the piebald cylinder liner is that the hardness is 220-300HBW, the tensile strength is >800Mpa, the el...

Embodiment 2

[0039] The blank is produced by water-cooled metal mold centrifugal casting method, and its composition 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) Melting in a 500Kg medium-frequency induction furnace, the melting temperature is 1500°C-1550°C, and the molten iron is left to stand for 10 minutes after melting; the primary inoculant is 75SiFe; the nodulizer grade is FeSiMg6RE2; the secondary inoculant is silicon strontium.

[0042] 2) Using a single-station centrifugal pouring machine for pouring: pour the molten iron after standing still into a large ladle (dam type ladle) and place nodulizer, 75SiFe inoculant, and cover with plant ash at the bottom of the ladle in turn; Then transfer to the pouring spoon for pouring, and carry out secondary inoculation (incubation at the bottom o...

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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 piebald 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 liners are mainly used at present. This type of cylinder liner has the disadvantages of low strength, poor plasticity, poor oil storage and long running-in period with the piston. Contents of the invention [0003] The purpose of the present invention is to overcome the above disadvantages, and provide a piebald cylinder liner produced by centrifugal casting and its production process, which are used to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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