Steel cylinder sleeve and preparation method thereof

A cylinder liner, steel technology, applied in the field of cylinder liner manufacturing, can solve the problems of poor anti-cavitation performance, scrapped engine, low strength, etc., and achieve the effect of good anti-cavitation performance, good anti-knock performance and high strength

Active Publication Date: 2020-11-24
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cylinder liner currently used is made of cast iron. For wet cylinder liners, especially for high-explosion pressure and high-power engines, cast iron cylinder liners have low strength, easy to crack, and fall off. At the same time, d...

Method used

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  • Steel cylinder sleeve and preparation method thereof

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preparation example Construction

[0020] In view of the problems of low strength of the cylinder liner, inability to withstand high explosion pressure and high power in the prior art, the present application designs a low-manganese alloy steel cylinder liner, and provides a preparation method thereof, so that the hardness of the steel cylinder liner, The elastic modulus and strength are high, which realizes the improvement of high explosion pressure and high power of the engine, and at the same time solves the anti-cavitation performance of the cylinder liner and improves the utilization rate of materials; due to the better toughness of the steel cylinder liner, it reduces the The occurrence of failures such as the collapse of the cylinder and the fall of the platform, and the cast steel cylinder liner is thinner than the cast iron material, which achieves the purpose of energy saving and environmental protection. Specifically, the embodiment of the present invention discloses a method for preparing a steel cyl...

Embodiment 1

[0035] Embodiment 1 A kind of high-strength, anti-cavitation cast steel cylinder liner is realized in the following manner:

[0036] 1) Smelting: use carbon steel scrap (scrap steel) to smelt at a temperature of 1600 ° C. After the melting is complete, add an appropriate amount of ferrosilicon and ferromanganese to make the content of each component as C: 0.15%, Si: 0.30%, Mn: 0.95%, P: 0.035%, S: 0.032%;

[0037]2) Deoxidation and slag removal: add deoxidizer and slag remover for deoxidation and slag removal, the temperature continues to rise to 1680°C, and the slag is removed and left to stand for 10 minutes;

[0038] 3) Casting: use a multi-station centrifugal casting machine for casting;

[0039] 4) Rough machining: rough machining of the cylinder liner blank, the unilateral allowance is about .5mm;

[0040] 5) Heat treatment: put the cylinder liner into the pit furnace, quickly heat up to 920 ° C for austenitization, and keep it for 1 hour, then open the furnace cover, ...

Embodiment 2

[0043] Embodiment 2 A high-strength, cavitation-resistant cast steel cylinder liner is obtained in the following manner:

[0044] 1) Smelting: use carbon steel scrap (scrap steel (carbon content less than 0.45%), smelt completely at 1600 ° C, then add ferrosilicon and ferromanganese to continue smelting, and finally obtain the mass percentage of each component: C: 0.18%, Si: 0.34%, Mn: 1.32%, P: 0.038%, S: 0.028;

[0045] 2) Deoxidation and slag removal: Add deoxidizer and slag remover to deoxidize and remove slag from molten iron, and continue to heat up to 1680°C and let stand for 15min;

[0046] 3) Casting: use a multi-station casting machine to cast and form;

[0047] 4) Rough machining: Rough machining the cylinder liner blank inside and outside, with a unilateral allowance of about 0.5mm;

[0048] 5) Heat treatment: put the cylinder liner into the pit furnace, quickly heat up to 920 ° C for austenitization, and keep it for 1 hour, then open the furnace cover and put it...

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Abstract

The invention provides a preparation method of a steel cylinder sleeve. The preparation method comprises the following steps that (A) smelting is carried out after burdening is completed, and molten steel with the following components is obtained; (B) the molten steel is subjected to centrifugal casting, and a steel cylinder sleeve blank is obtained; and (C) the steel cylinder sleeve blank is subjected to austenitizing heat treatment and then subjected to isothermal quenching, and the steel cylinder sleeve is obtained. The low-manganese alloy steel cylinder sleeve blank is prepared through a centrifugal casting method, a matrix is converted into bainite and part of martensite through austenitizing and isothermal salt bath quenching, and finally the obtained steel cylinder sleeve has high strength, abrasion resistance and anti-explosion performance and better cavitation erosion resistance.

Description

technical field [0001] The invention relates to the field of cylinder liner manufacturing, in particular to a steel cylinder liner and a preparation method thereof. Background technique [0002] The cylinder liner is a cylindrical part, which is placed in the cylinder block hole of the body, and is pressed and fixed by the cylinder head. The piston reciprocates in its inner hole, and is cooled by cooling water outside. It forms the working space of the cylinder together with the cylinder head and the piston. [0003] The cylinder liner currently used is made of cast iron. For wet cylinder liner, especially for high-explosion pressure and high-power engines, the cast iron cylinder liner has low strength, easy cracking, and falling off. At the same time, due to the existence of graphite, the anti-cavitation performance Generally poor, especially for construction machinery, the cavitation performance is particularly obvious, and sometimes even cavitation perforation causes th...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C33/04C21D1/20C21D9/00
CPCC21D1/20C21D9/00C21D2211/002C21D2211/008C22C33/04C22C38/02C22C38/04
Inventor 姜玉领行鹏举郭进京刘祥志秦小才
Owner ZYNP GRP
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