CN103567398A

CN103567398A - High-abrasion-resistance anti-dust cylinder liner casting technology

Info

Publication number: CN103567398A
Application number: CN201210262273.4A
Authority: CN
Inventors: 韦波
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-24
Filing date: 2012-07-24
Publication date: 2014-02-12

Abstract

The invention discloses high-abrasion-resistance anti-dust cylinder liner casting technology. The casting technology is characterized by including following alloy elements of 3.0-3.3% of C, 2.1-2.4% of Si, 0.8-1.1% of Mn, 0.1-0.2% of P, 0.02-0.08% of S, 0.35-0.45% of Ti, 0.2-0.4% of Sb, 0.8-1.1% Cu, 0.25-0.35% of Cr and 90.62- 92.38% of Fe. A production technology method includes: firstly, processing the Ti and Sb into synthetic particles 2-3mm in size for standby application; secondly, compounding and smelting alloy proportionally, adding the synthetic particles proportionally when the smelting temperature reaches to 1550 DEG C, purifying for 6 minutes after the particles are added, then performing inoculation twice by inoculating an inoculant in a bale prior to inoculating in a pouring ladle, and controlling the pouring temperature to be 1350-1320 DEG C, pouring speed to be 2kg/s and cooling intensity to be water cooling for 120 seconds; thirdly, when a blank stripped from a die is at the temperature of 600 DEG C, placing the blank into a solution for quenching to enable a metallographic structure of a cylinder liner to be changed into a lower bainite.

Description

High abrasion desertification dirt cylinder liner casting technology

Technical field

The present invention relates to cylinder liner casting technology, be specifically related to a kind of high abrasion desertification dirt cylinder liner casting technology.

Background technology

Due to the deterioration increasingly of environment, China's most area is northern especially, central and west regions, and sand and dust are larger, and hard particulate very easily sucks cylinder, produces abrasive wear, has a strong impact on the service life of engine.

Cylinder is engine core part, is the space of gas compression, burning expansion, is the track of piston movement guiding.The highest transient temperature in combustion process is up to 2200～2400 ℃, the highest instantaneous pressure is up to 12～14MPa, the inwall of cylinder jacket is directly subject to the effect of high temperature, high pressure, fusible, if cylinder sucks particulate sand and dust again, make cylinder inner wall increase again abrasive wear under the extreme condition of work worsening, further shortened the service life of engine.

Cylinder jacket is one of important friction pair of engine, and its wearability directly has influence on the consumption of life-span, power, fuel oil and the machine oil of engine.Along with improving constantly of engine movement velocity, mechanical performance stress and thermal stress that its cylinder sleeve, piston, piston ring bear are more and more high, the wearing and tearing of friction pair in the cylinder of diesel engine causing therefrom, and particularly sand and dust abrasive wear is even more serious.

The material cylinder jacket such as the traditional high-phosphorous iron of China, boron cast iron, low-alloy cast iron, vanadium-titanium cast iron have not adapted to the demand of current high-grade engine with supercharger.Its main wear form has: abrasive wear, scuff wear, corrosive wear etc.Along with the improving constantly of diesel engine strengthening, its movement velocity and explosion pressure are all greatly improved, so the wear problem of cylinder jacket is also day by day serious in recent years.Therefore, development anti-abrasion type cylinder jacket is very important.

Summary of the invention

The invention provides a kind of western high abrasion desertification dirt cylinder liner casting technology, adopt this kind of cylinder jacket to improve engine serviceability, increase the service life, reduce energy resource consumption, improve engine exhaust emission quality, conservation of nature environment.

Technical solution of the present invention is in this cylinder jacket, to contain following alloying element: C 3.0～3.3%; Si 2.1～2.4%; Mn 0.8～1.1%; P 0.1～0.2%; S 0.02～0.08%; Ti 0.35～0.45%; Sb 0.2～0.4%; Cu 0.8～1.1%; Cr 0.25～0.35%; Fe 90.62～92.38%.

Cylinder jacket method of manufacturing technology of the present invention is: first Ti and Sb being processed into synthetic particle is that 2-3mm is standby; Then the alloy melting of preparing burden in proportion, adds synthetic particle in proportion when smelting temperature reaches 1550 ℃, particle adds after-purification 6 minutes, then carries out breeding for twice, first inovulant is being bred in large bag, then is breeding in pouring ladle; Pouring temperature is 1350 ℃～1320 ℃; Poring rate is 2kg/s; Intensity of cooling is water-cooled 120 seconds; After blank depanning, put into solution during 600 ℃ of left and right and quench, make the metallographic structure of cylinder sleeve change lower bainite into.

The present invention has the following advantages: 1. in Cast Iron Melts, add Ti and Sb to synthesize particle, particle dispersion is even, the dense structure of cylinder sleeve, and Heat stability is good, has good oil storage capacity and excellent anti-wear performance and resistance to corrosion; 2. the method flow of the synthetic particle of Ti and Sb is simple, and cost is low, is easy to realize industrialization and produces; 3. Ti and Sb are strong graphite elements, have the pearlitic effect of refinement graphite, form the stable especially high-intensity compound containing Ti and Sb, and disperse is dispersed in the matrix of Cast iron liner, strengthens wearability.4. by twice, breed further refinement metallographic structure, strengthen mechanical performance; 5. utilize the immediate quenching of depanning blank, make it change lower bainite tissue into, make engine more enter one and improve its wearability, adapt to the more adverse circumstances work of Midwest sand and dust.

The specific embodiment

Example 1: first Ti and Sb being processed into synthetic particle is that 2-3mm is standby; Then prepare burden in proportion melting, wherein C3.0% of alloy; Si 2.1%; Mn 0.8%; P 0.1%; S 0.02%; Cu 0.8%; Cr 0.25%; Fe 92.38%, adds in proportion synthetic particle when smelting temperature reaches 1550 ℃, wherein Ti 0.35%, Sb 0.2%, and particle adds after-purification 6 minutes, then carries out breeding for twice, first inovulant is being bred in large bag, then is breeding in pouring ladle; Pouring temperature is 1350 ℃～1320 ℃; Poring rate is 2kg/s; Intensity of cooling is water-cooled 120 seconds; After blank depanning, put into solution during 600 ℃ of left and right and quench, make the metallographic structure of cylinder sleeve change lower bainite into.

Example 2: first Ti and Sb being processed into synthetic particle is that 2-3mm is standby; Then prepare burden in proportion melting, wherein C3.3% of alloy; Si 2.4%; Mn 1.1%; P 0.2%; S 0.08%; Cu 1.1%; Cr 0.35%; Fe 90.62%, adds in proportion synthetic particle when smelting temperature reaches 1550 ℃, wherein Ti 0.45%, Sb 0.4%, and particle adds after-purification 6 minutes, then carries out breeding for twice, first inovulant is being bred in large bag, then is breeding in pouring ladle; Pouring temperature is 1350 ℃～1320 ℃; Poring rate is 2kg/s; Intensity of cooling is water-cooled 120 seconds; After blank depanning, put into solution during 600 ℃ of left and right and quench, make the metallographic structure of cylinder sleeve change lower bainite into.

Example 3: first Ti and Sb being processed into synthetic particle is that 2-3mm is standby; Then prepare burden in proportion melting, wherein C3.15% of alloy; Si 2.25%; Mn 0.95%; P 0.15%; S 0.05%; Cu 0.95%; Cr 0.3%; Fe 91.5%, adds in proportion synthetic particle when smelting temperature reaches 1550 ℃, wherein Ti 0.4%, Sb 0.3%, and particle adds after-purification 6 minutes, then carries out breeding for twice, first inovulant is being bred in large bag, then is breeding in pouring ladle; Pouring temperature is 1350 ℃～1320 ℃; Poring rate is 2kg/s; Intensity of cooling is water-cooled 120 seconds; After blank depanning, put into solution during 600 ℃ of left and right and quench, make the metallographic structure of cylinder sleeve change lower bainite into.

In the solution of HT300 cast iron quality, introduce the synthetic granuloplastic cylinder jacket of Ti and Sb, tensile strength is greater than 300MPa, and hardness is greater than 310HB.

Claims

1. high abrasion desertification dirt cylinder liner casting technology, is characterized in that: this casting technique is comprised of following alloying element: C 3.0～3.3%; Si 2.1～2.4%; Mn 0.8～1.1%; P 0.1～0.2%; S 0.02～0.08%; Ti 0.35～0.45%; Sb 0.2～0.4%; Cu 0.8～1.1%; Cr 0.25～0.35%; Fe 90.62～92.38%.Its method of manufacturing technology is: first Ti and Sb being processed into synthetic particle is that 2-3mm is standby; Then the alloy melting of preparing burden in proportion, adds synthetic particle in proportion when smelting temperature reaches 1550 ℃, particle adds after-purification 6 minutes, then carries out breeding for twice, first inovulant is being bred in large bag, then is breeding in pouring ladle; Pouring temperature is 1350 ℃～1320 ℃; Poring rate is 2kg/s; Intensity of cooling is water-cooled 120 seconds; After blank depanning, put into solution during 600 ℃ of left and right and quench, make the metallographic structure of cylinder sleeve change lower bainite into.