CN106544578A - A kind of marine diesel engine piston ring apical ring material DPR DG III and its casting method - Google Patents
A kind of marine diesel engine piston ring apical ring material DPR DG III and its casting method Download PDFInfo
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- CN106544578A CN106544578A CN201611130766.7A CN201611130766A CN106544578A CN 106544578 A CN106544578 A CN 106544578A CN 201611130766 A CN201611130766 A CN 201611130766A CN 106544578 A CN106544578 A CN 106544578A
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- diesel engine
- piston ring
- dpr
- marine diesel
- engine piston
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a kind of marine diesel engine piston ring apical ring material DPR DG III and casting method, the alloy cast iron DPR DG III that the alloying elements such as a small amount of copper, manganese, molybdenum are poured into are added in cast iron, graphite nodulizing rate is up to more than 80%, more than 95%, bending strength Rb is more than 740N/mm to matrix medium pearlite content2, elastic modulus E is up to 131 159kN/mm2, Brinell hardness HB 250 290 reached the requirement of external import piston ring material technical specification.Alloy cast iron DPR DG III have the advantages that hardness is moderate, bending strength is high, abrasion and corrosion resistance good, impact resistance is greatly improved, meet the use requirement of modern high explosive force diesel engine, the even CV1 standards for reaching MAN B＆W material standards of all technical are required, imported material CV1 can be substituted, for MAN B＆W diesel engine apical rings.
Description
Technical field
The invention belongs to the foundry engieering of alloy cast iron piston ring, particularly marine diesel engine piston ring apical ring material and its
Casting method.
Background technology
Generally there are 4 road piston rings in marine diesel cylinder, top piston ring is referred to as apical ring, other three road piston ring quilts
Referred to as base ring.The impulsive force that top piston ring bears is bigger than following a few road piston rings, therefore, the material of apical ring and base ring is
It is different.Piston ring apical ring is a vital part in boat diesel engine combustor.Piston ring apical ring in the course of the work,
High temperature, high pressure should be born, violent abrasion and the impact of larger load is born again, the quality of its performance directly affects bavin
The work efficiency and work quality of oil machine.And piston ring apical ring material quality directly determines the quality of piston ring performance.At present
China is only capable of the marine diesel piston ring for producing the not high material of a small amount of technology content.Specified according to domestic ships mark, alloy cast iron piston ring
During nominal diameter D ＞ 300mm, Brinell hardness HB=195～266, the elastic modulus E of cylinder cast pistons ring are 112kN/mm2、
Bending strength Rb is more than 471N/mm2；Piston ring used by the advanced two-stroke in country MAN-B＆W diesel engine manufacturers peculiar to vessel is
External import.The piston ring apical ring performance requirement of MAN-B＆W diesel engines is as follows：
Graphite form is more than 80% vermiform, and matrix is pearlite, a small amount of ferrite and hard phase (cementite
+ iron phosphide eutectic), mechanical property Elastic Modulus E are 131-159kN/mm2, Brinell hardness is HB=230-285, bending strength Rb
≥740N/mm2.Obviously, the piston ring apical ring for producing by domestic standard can not meet wanting for two-stroke MAN-B＆W diesel engines peculiar to vessel
Ask.With the rapid advances of the domestic ship industry development impetus, the yield of marine diesel is increased year by year, marine diesel piston ring apical ring
Demand also increase year by year.The problem existed by external import piston ring apical ring：One is cost more and more higher, and two is week of ordering goods
Phase is long.Urgent need develops the marine diesel piston ring apical ring of function admirable, substitutes the piston ring apical ring of import.
The content of the invention
To solve the problems referred to above that prior art is present, the present invention will be designed and a kind of both with reduces cost and can shorten order
In the cycle, the marine diesel engine piston ring apical ring material of two-stroke MAN-B＆W diesel engines production requirement performance peculiar to vessel can be reached again
DPR-DG III and its casting method.
Technical scheme is as follows：
Marine diesel engine piston ring apical ring material DPR-DG III, component and mass content it is as follows：
C：3.1%～3.6%；
Si：2.0%～2.8%；
Mn：0.5%～0.9%；
Cr：0.03%～0.90%；
Mo：0.4%～0.7%；
Ni：0.18%～0.45%；
Cu：0.8%～1.3%；
Sn：0.04%～0.07%；
P：0.05%～0.25%；
S：≤ 0.03%；
Mg：≤ 0.03%；
Remaining component is Fe.
Further, remaining described component is Fe and inevitable impurity.
The casting method of marine diesel engine piston ring apical ring, comprises the following steps：
A, preparation raw material：According to III component preparation raw materials of marine diesel engine piston ring apical ring material DPR-DG；
B, melting：The dispensing of step A is smelted into into molten iron with smelting furnace；Sample between 1430-1450 DEG C of molten iron temperature,
According to the result of spectrometer analysis, the secondary addition of alloy is determined, to ensure the percentage composition of step A each component；Add alloy
Secondary adjustment, continues intensification melting, and molten iron maximum temperature is no more than 1520 DEG C.
C, cast：Vermiculizer is placed on into casting ladle bottom before cast, and swarf is covered above, vermiculizer addition is total
The 0.2% of molten steel quality；According to the blank set of specifications and blank wall thickness of foundry goods, and adjust tapping temperature and pouring temperature；Specifically
Con trolling index is shown in Table 1, and in table 1, blank set of specifications blank outside dimension is represented；
Table 1：Con trolling index table
Further, described smelting furnace is frequency-conversion electric induction furnace.
Further, described vermiculizer is at least contained including following quality by angstrom willing carbon (China) company limited production
The component of amount：
Mg:5.0%-6.0%；
Al：0.0%-1.0%.
Si：44%-48%；
Ca：1.8%-2.3%；
RE：5.5%-6.5%.
Further, described pouring temperature when temperature is less than -10 DEG C near the upper limit, it is close when temperature is higher than 25 DEG C
Lower limit.
Compared with prior art, the invention has the advantages that：
1st, Forming Theory of the present invention from quasiflake graphite, is inferred to nodularization element rare earth and magnesium and graphite form is risen
Decisive role, and the direction of growth of the configuration of surface from quasiflake graphite, graphite etc., the matrix for being inferred to vermicular cast iron has
Form strongly ferritic tendency.The present invention is by experimental results demonstrate that the Forming Theory of quasiflake graphite has aobvious to the present invention
Write directive significance.Molten iron is processed by the vermiculizer of selection different manufacturers different content, show that angstrom willing carbon (China) is limited
The vermiculizer best results of company's production, in the case where other process regulations are proper, by the addition for controlling vermiculizer
Amount, reaches required graphite form.By the consumption of vermiculizer of keeping under strict control, what the size, wall thickness according to foundry goods was required to rate of cooling
Difference, adjusts pouring temperature to reach the purpose for changing graphite form and distribution.
2nd, the present invention is added in cast iron by the control to piston ring apical ring materials chemistry component and weight/mass percentage composition
The alloy cast iron DPR-DG III that the alloying elements such as a small amount of copper, manganese, molybdenum are poured into, graphite nodulizing rate up to more than 80%, matrix
More than 95%, bending strength Rb is more than 740N/mm to tissue medium pearlite content2, elastic modulus E is up to 131-159kN/mm2,
Brinell hardness HB 250-290, has reached the requirement of external import piston ring material technical specification.Alloy cast iron DPR-DG III has
Have the advantages that hardness is moderate, bending strength is high, abrasion and corrosion resistance good, impact resistance is greatly improved, meet modern high quick-fried
Have an effect the use requirement of diesel engine, the even CV1 standards for reaching MAN-B＆W material standards of all technical are required, can be substituted
Imported material CV1, for MAN-B＆W diesel engine apical rings.
3rd, due to invention achieves the performance requirement of MAN-B＆W piston ring of diesel engine apical rings, it is not necessary to enter from foreign countries again
Mouthful, with the piston ring price of present invention production at least than entering the price reduction 1/2 of gap piston ring；The work of the conventional specification of the present invention
Plug ring is equipped with stock, with taking with being 1 month or so with, the specification that is of little use production cycle, and can enter gap piston ring apical ring and stock up
Cycle takes 3 months or so.As can be seen here, the present invention greatly reduces manufacturing cost, shortens the order cycle time.
Description of the drawings
Fig. 1 is the big logotypes of graphite form under 100 times of metallurgical microscopes of alloy cast iron DPR-DG III.
Fig. 2 is matrix schematic diagram after alloy cast iron DPR-DG III corrodes under 500 times of metallurgical microscopes.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further described through.
Embodiment one：
The casting method of marine diesel engine piston ring apical ring, comprises the following steps：
1st, by following mass percent dispensing：C：3.2%；Si：2.2%；Mn：0.6%；Cr：0.07%；Mo：0.4%；
Ni：0.25%；Cu：1.0%；Sn：0.05%；P：0.15%；S≤0.02%；Mg：≤ 0.03%, remaining is Fe and can not keep away
Exempt from impurity；
2nd, melting：The dispensing of step 1 is smelted into into molten iron with frequency-conversion electric induction furnace, foundry goods is diameter 350mm, wall thickness 12mm
Tubular blank, adjustment tapping temperature is 1470 DEG C, adds 0.2% vermiculizer, residual magnesium amount control 0.028%, cast
Temperature is 1380 DEG C.
Up to 90%, matrix is pearlite, a small amount of ferrite to the III graphite nodulizing rates of alloy cast iron DPR-DG for pouring into
And hard phase (cementite+iron phosphide eutectic), power elastic modulus E reach 140kN/mm2, Brinell hardness is HB273；Bending strength Rb=
860N/mm2。
Embodiment two：
The casting method of marine diesel engine piston ring apical ring, comprises the following steps：
1st, by following mass percent dispensing：C：3.5%；Si：2.8%；Mn：0.7%；Cr：0.09%；Mo：0.4%；
Ni：0.4%；Cu：1.2%；Sn：0.05%；P：0.15%；S≤0.02%；Mg：≤ 0.03%, remaining is for Fe and unavoidably
Impurity；
2nd, melting：The dispensing of step 1 is smelted into into molten iron with frequency-conversion electric induction furnace, foundry goods is diameter 800mm, wall thickness 25mm
Tubular blank, adjustment tapping temperature is 1430 DEG C, adds 0.2% vermiculizer, residual magnesium amount control 0.008%, cast
Temperature is 1340 DEG C.
Up to 93%, matrix is pearlite, a small amount of ferrite to the III graphite nodulizing rates of alloy cast iron DPR-DG for pouring into
And hard phase (cementite+iron phosphide eutectic), power elastic modulus E reach 132kN/mm2, Brinell hardness is HB269, bending strength Rb=
760N/mm2。
Embodiment three：
The casting method of marine diesel engine piston ring apical ring, comprises the following steps：
Melting, 1433 DEG C of tapping temperature are carried out in -15 DEG C of temperature by 2 dispensing of embodiment, pouring temperature is 1343 DEG C, its
It is remaining same as Example 2.
Example IV：
The casting method of marine diesel engine piston ring apical ring, comprises the following steps：By 2 dispensing of embodiment in 28 DEG C of temperature
Melting is carried out, 1427 DEG C of tapping temperature, pouring temperature are 1397 DEG C, and remaining is same as Example 2.
By above-described embodiment melting alloy cast iron DPR-DG III out, the graphite form under 100 times of metallurgical microscopes
Size is as shown in figure 1, it can be seen that the present invention is obtained quasiflake graphite, nodulizing rate is more than 90% (according to GB/T26656-
2011 vermicular cast iron metal lographic examinations), intensity and wearability it is good.Alloy cast iron DPR-DG III corrodes under 500 times of metallurgical microscopes
Matrix is as shown in Fig. 2 it can be seen that matrix is that (cementite+phosphorus is common for pearlite, a small amount of ferrite and hard phase afterwards
It is brilliant), Fining of Pearlite, intensity are good.
Above-described embodiment is only presently preferred embodiments of the present invention, is not limited the scope of the invention according to this, thus it is all according to
The equivalence changes done by the structure of the present invention, shape, principle, all should be covered by within protection scope of the present invention.
Claims (6)
1. marine diesel engine piston ring apical ring material DPR-DG III, it is characterised in that：Component and mass content are as follows：
C：3.1%～3.6%；
Si：2.0%～2.8%；
Mn：0.5%～0.9%；
Cr：0.03%～0.90%；
Mo：0.4%～0.7%；
Ni：0.18%～0.45%；
Cu：0.8%～1.3%；
Sn：0.04%～0.07%；
P：0.05%～0.25%；
S：≤ 0.03%；
Mg：≤ 0.03%；
Remaining component is Fe.
2. marine diesel engine piston ring apical ring material DPR-DGIII according to claim 1, it is characterised in that：Described
Remaining component is Fe and inevitable impurity.
3. the casting method of marine diesel engine piston ring apical ring material DPR-DGIII, it is characterised in that：Comprise the following steps：
A, preparation raw material：According to the component preparation raw material of marine diesel engine piston ring apical ring material DPR-DG III；
B, melting：The dispensing of step A is smelted into into molten iron with smelting furnace；Sample between 1430-1450 DEG C of molten iron temperature, according to
The result of spectrometer analysis, determines the secondary addition of alloy, to ensure the percentage composition of step A each component；Add alloy secondary
Adjustment, continues intensification melting, and molten iron maximum temperature is no more than 1520 DEG C.
C, cast：Vermiculizer is placed on into casting ladle bottom before cast, and swarf is covered above, vermiculizer addition is total molten iron
The 0.2% of quality,；According to the blank set of specifications and blank wall thickness of foundry goods, and adjust tapping temperature and pouring temperature；It is concrete to control
Index is shown in Table 1；
Table 1：Con trolling index table
In table, blank set of specifications blank outside dimension is represented.
4. the casting method of marine diesel engine piston ring apical ring according to claim 3, it is characterised in that：Described melting
Stove is frequency-conversion electric induction furnace.
5. the casting method of marine diesel engine piston ring apical ring according to claim 3, it is characterised in that：Described compactedization
Component of the agent at least including following mass content：
Mg:5.0%-6.0%；
Al：0.0%-1.0%.
Si：44%-48%；
Ca：1.8%-2.3%；
RE：5.5%-6.5%.
6. the casting method of marine diesel engine piston ring apical ring according to claim 3, it is characterised in that：Described cast
Temperature when temperature is less than -10 DEG C near the upper limit, when temperature is higher than 25 DEG C near lower limit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611130766.7A CN106544578B (en) | 2016-12-09 | 2016-12-09 | The casting method of marine diesel engine piston ring apical ring material |
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| CN201611130766.7A CN106544578B (en) | 2016-12-09 | 2016-12-09 | The casting method of marine diesel engine piston ring apical ring material |
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| CN106544578B CN106544578B (en) | 2018-12-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108588545A (en) * | 2018-03-19 | 2018-09-28 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
| CN109898014A (en) * | 2017-12-08 | 2019-06-18 | 现代自动车株式会社 | High-strength gray cast iron |
| CN110819883A (en) * | 2019-10-08 | 2020-02-21 | 一汽解放大连柴油机有限公司 | Cylinder cover material and preparation process method thereof |
| CN111235471A (en) * | 2019-12-12 | 2020-06-05 | 上海波赫驱动系统有限公司 | Piston material for low-rotation-speed large-torque radial motor and preparation method thereof |
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| CN101660083A (en) * | 2008-08-26 | 2010-03-03 | 张跃成 | High-performance vermicular cast iron for oven protecting iron pieces of coke oven |
| CN103993216A (en) * | 2014-05-26 | 2014-08-20 | 广东美芝精密制造有限公司 | Plunger for compressor pump body, production method thereof as well as compressor and refrigeration equipment |
| CN105755360A (en) * | 2016-05-12 | 2016-07-13 | 河南工程学院 | Preparation technology of vermicular cast iron with high pearlite and stable vermiculation |
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2016
- 2016-12-09 CN CN201611130766.7A patent/CN106544578B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660083A (en) * | 2008-08-26 | 2010-03-03 | 张跃成 | High-performance vermicular cast iron for oven protecting iron pieces of coke oven |
| CN103993216A (en) * | 2014-05-26 | 2014-08-20 | 广东美芝精密制造有限公司 | Plunger for compressor pump body, production method thereof as well as compressor and refrigeration equipment |
| CN105755360A (en) * | 2016-05-12 | 2016-07-13 | 河南工程学院 | Preparation technology of vermicular cast iron with high pearlite and stable vermiculation |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898014A (en) * | 2017-12-08 | 2019-06-18 | 现代自动车株式会社 | High-strength gray cast iron |
| CN109898014B (en) * | 2017-12-08 | 2022-04-15 | 现代自动车株式会社 | High-strength gray cast iron |
| CN108588545A (en) * | 2018-03-19 | 2018-09-28 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
| CN108588545B (en) * | 2018-03-19 | 2019-09-13 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
| CN110819883A (en) * | 2019-10-08 | 2020-02-21 | 一汽解放大连柴油机有限公司 | Cylinder cover material and preparation process method thereof |
| CN111235471A (en) * | 2019-12-12 | 2020-06-05 | 上海波赫驱动系统有限公司 | Piston material for low-rotation-speed large-torque radial motor and preparation method thereof |
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| CN106544578B (en) | 2018-12-28 |
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