Centrifugally-cast burr cylinder sleeve and preparation method thereof

A centrifugal casting and cylinder liner technology, which is applied to casting molding equipment, cylinders, casting molds, etc., can solve the problems of reduced service life of the mold, deterioration of the metallographic structure of the cylinder liner, and poor filling ability of molten iron, so as to reduce heat, Good metallographic structure and good burr formation

Active Publication Date: 2018-04-20
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Centrifugal casting requires products with raised burrs on the outer wall of the cylinder liner. The production process is limited. The burrs on the outer wall of the cylinder liner are in direct contact with the mold, resulting in faster cooling of the molten iron and poor filling ability of the molten iron. Cavities are in close contact with each other. During the subsequent cylinder output process, the burrs are easy to damage the mold, resulting in a reduction in the service life of the mold, deterioration of the metallographic structure of the cylinder liner, and poor processing performance.

Method used

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  • Centrifugally-cast burr cylinder sleeve and preparation method thereof
  • Centrifugally-cast burr cylinder sleeve and preparation method thereof
  • Centrifugally-cast burr cylinder sleeve and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] A centrifugal casting burr cylinder liner, in weight percentage, the chemical composition of the burr cylinder liner provided by this example is as follows:

[0028]

[0029] The preparation method of the burr cylinder liner of above-mentioned centrifugal casting comprises the following steps:

[0030] (1) Accurately weigh each raw material, use an intermediate frequency induction furnace for melting, add silicon carbide powder (particle size 0.2~10mm) accounting for 0.1% of the molten iron mass, and control the temperature of the molten iron at 1550°C;

[0031] (2) Preparation of paint: Mix bentonite and water at a mass ratio of 1:10, stir for 10 hours, weigh 100kg of the solution, add 16kg of diatomite (-300 mesh accounts for more than 70%), and stir for 1.5 hours ,Such as figure 1 As shown, add the stirred paint into the first paint pressure tank 41, adjust the pressure of the first paint pressure tank 41 to 0.15MPa, add the second paint prepared in advance in th...

Embodiment 2

[0037] A centrifugal casting burr cylinder liner, in weight percentage, the chemical composition of the burr cylinder liner provided by this example is as follows:

[0038]

[0039] The preparation method of the burr cylinder liner of above-mentioned centrifugal casting comprises the following steps:

[0040] (1) Accurately weigh each raw material, use an intermediate frequency induction furnace for melting, add silicon carbide powder (particle size 0.2~10mm) accounting for 0.15% of the molten iron mass, and control the temperature of the molten iron at 1500°C;

[0041] (2) Preparation of paint: Mix bentonite and water at a mass ratio of 1:10, stir for 11 hours, weigh 100kg of the solution, add 15kg of diatomite (-300 mesh accounts for more than 70%), and stir for 1 hour ,Such as figure 1 As shown, add the stirred paint into the first paint pressure tank 41, adjust the pressure of the first paint pressure tank 41 to 0.1MPa, add the second paint prepared in advance in the sec...

Embodiment 3

[0047] A centrifugal casting burr cylinder liner, in weight percentage, the chemical composition of the burr cylinder liner provided by this example is as follows:

[0048]

[0049] The preparation method of the burr cylinder liner of above-mentioned centrifugal casting comprises the following steps:

[0050] (1) Accurately weigh each raw material, use an intermediate frequency induction furnace to smelt, add silicon carbide powder (particle size 0.2~10mm) accounting for 0.2% of the molten iron mass, and control the temperature of the molten iron to 1550°C;

[0051] (2) Preparation of paint: Mix bentonite and water at a mass ratio of 1:10, stir for 12 hours, weigh 100kg of the solution, add 20kg of diatomite (-300 mesh accounts for more than 70%), and stir for another 2 hours ,Such as figure 1 As shown, add the stirred paint into the first paint pressure tank 41, adjust the pressure of the first paint pressure tank 41 to 0.2MPa, add the second paint prepared in advance in ...

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Abstract

The invention discloses a centrifugally-cast burr cylinder sleeve and a preparation method thereof, and belongs to the field of cylinder sleeves. The centrifugally-cast burr cylinder sleeve comprises,by weight, 2.8%-3.7% of carbon, 0.03%-0.08% of sulfur, 1.7%-2.8% of silicon, more than zero and no more than 0.5% of phosphorus, 0.5%-1.0% of manganese, more than zero and no more than 0.4% of chromium, 0.1%-0.6% of copper, and the balance iron. A-type graphite is no less than 80% in the metallographic phase of the cylinder sleeve, the length of the A-type graphite is at 4-7 grades, the matrix structure is fine lamellar pearlite, ferrite is no more than 3%, the amount of carbide and iron phosphide eutectic is no more than 5%, and the carbide and the iron phosphide eutectic are in discontinuous network distribution or even distribution. Customer requirements to mechanical performance can be met, the condition of pull of the inwall of a pipe mould is reduced obviously, the life of the mouldis prolonged greatly, and the processing performance of the cylinder sleeve is better.

Description

technical field [0001] The invention belongs to the field of cylinder liners, and in particular relates to a centrifugally cast burr cylinder liner and a preparation method thereof. Background technique [0002] The all-aluminum engine has the advantages of light weight and good heat dissipation, and has been widely used in the industry, but its mechanical properties, wear resistance, and thermal stability are not as good as cast iron. For this reason, currently the industry adopts the method of adding cast iron inserts to the aluminum cylinder body to solve this problem. [0003] The cast iron insert used in the aluminum cylinder block is also called the cylinder liner. The cylinder liner with a large demand in the market is the burr cylinder liner. The burr cylinder liner is directly cast from molten iron, and its outer surface is distributed with raised shrinkage points similar to burrs. These burrs can increase the bonding force and thermal conductivity of the cylinder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06B22D13/00B22C3/00F02F1/00
Inventor 孙世贵刘永锋孟祥慧
Owner ZYNP GRP
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