CN107937799A - A kind of burr cylinder jacket of centrifugal casting and preparation method thereof - Google Patents
A kind of burr cylinder jacket of centrifugal casting and preparation method thereof Download PDFInfo
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- CN107937799A CN107937799A CN201711293486.2A CN201711293486A CN107937799A CN 107937799 A CN107937799 A CN 107937799A CN 201711293486 A CN201711293486 A CN 201711293486A CN 107937799 A CN107937799 A CN 107937799A
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- cylinder jacket
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/004—Cylinder liners
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Burr cylinder jacket of a kind of centrifugal casting and preparation method thereof, belongs to cylinder jacket field, and by weight percentage, the chemical composition of burr cylinder jacket is：Carbon：2.8‑3.7%；Sulphur：0.03‑0.08%；Silicon：1.7‑2.8%；0 ＜ phosphorus≤0.5%；Manganese：0.5‑1.0%；0 ＜ chromium≤0.4%；Copper：0.1 0.6%, surplus is iron.In cylinder jacket metallographic of the present invention more than A type graphite >=80%, 47 grades of length, matrix is fine pearlite, ferrite is no more than 3%, the quantity of carbide and iron phosphide eutectic is not more than 5%, both should be in interrupted net distribution or be uniformly distributed, and mechanical performance meets customer requirement, the pipe die inner wall situation of pulling significantly reduces, and the service life of mould greatly improves；And cylinder sleeve processing performance improves.
Description
Technical field
The invention belongs to cylinder jacket field, and in particular to burr cylinder jacket of a kind of centrifugal casting and preparation method thereof.
Background technology
All-aluminium engine has the advantages that light-weight, perfect heat-dissipating, in industry by wide popularization and application, still
Its mechanical performance, wear-resisting property, heat endurance etc. are not so good as cast iron.For this reason, add cast iron bushing using aluminum cylinder in industry at present
Mode solves the problems, such as this.
The bushing also known as cylinder jacket of cast iron applied to aluminum cylinder, the larger cylinder jacket of existing market demand is burr gas
Cylinder sleeve.Burr cylinder jacket is directly cast by iron liquid to be formed, and the projections collapse point of similar burr, these burrs are distributed with its outer surface
Cylinder jacket and the combination power and heat conductivility of aluminum cylinder can be increased, and then lift the radiating efficiency of engine.
Centrifugal casting production outer wall of cylinder jachet requirement has the product of convex burr form, and when production is limited be subject to technique, cylinder
Cover outer wall burr directly and mould contact, cause the cooling velocity of molten iron to be accelerated, molten iron mold-filling capacity is poor, and burr top and
Dies cavity is in close contact, it is follow-up go out cylinder during, burr easily pulls mould, causes die life to reduce, cylinder
Cover metallographic structure to be deteriorated, poor processability.
The content of the invention
It is an object of the invention to provide a kind of burr cylinder jacket of centrifugal casting and preparation method thereof.
Based on above-mentioned purpose, the present invention adopts the following technical scheme that：
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the chemical composition of burr cylinder jacket is：Carbon：2.8-
3.7%；Sulphur：0.03-0.08%；Silicon：1.7-2.8%；0 ＜ phosphorus≤0.5%；Manganese：0.5-1.0%；0 ＜ chromium≤0.4%；Copper：0.1-
0.6%, surplus is iron.
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps：
（1）Each raw material is accurately weighed, using medium-frequency induction furnace melting, adds the pretreating agent for accounting for iron liquid quality 0.1 ~ 0.2%,
Control 1500-1550 DEG C of iron liquid tapping temperature；
（2）The preparation of coating：By bentonite and water according to 1:（8~12）Mass ratio be mixed and stirred for 10-12 it is small when, choose
100kg solution add 15-20kg diatomite stirring 1-2 it is small when after stand at least 4 it is small when, be made the first coating；
（3）The first coating configured is respectively charged into the first coating pressure tank, second of coating loads the second coating pressure
Tank is to form uniform cavity on the surface of cast pipe die inner wall, and the pressure of the first coating pressure tank is 0.1-0.2MPa, and second applies
The pressure for expecting pressurized tank is 0.3-0.5MPa；
（4）The cast pipe die of centrifugal casting machine is preheating to 150-450 DEG C, the first coating then is sprayed to cast pipe die, if
The rotating speed for putting cast pipe die is 1000-1300r/min, and the first layer coating of 0.05-0.3mm thickness is formed in cast pipe die inner wall,
After the drying of first layer coating, to pouring into a mould pipe die inner-wall spraying second layer coating, the rotating speed for pouring into a mould pipe die is 1400 ~ 1700 r/
Min, the thickness of second layer coating is 0.3 ~ 1.1mm, and to be coated be completely dried can be poured into a mould；
（5）Melting qualification iron liquid is poured into a mould after inoculation, and 1350-1450 DEG C of pouring temperature, is bred using following current,
The addition of inovulant is cast iron liquid quality 0.4-0.8%, is poured into cast pipe die, cools down after molten steel preparation processing to obtain the final product
Burr cylinder jacket.
Further, the step（1）Middle pretreating agent is the carborundum powder of granularity 0.2-10mm.
Further, the step（2）Middle -300 mesh of diatomite granularity requirements accounts for more than 70%.
Further, the inovulant is silicon strontium inovulant.
After the spraying of the first coating, coating uniform fold is pouring into a mould the inner wall of pipe die, which is mainly heat-insulating property
It is good, casting cooling velocity can be slowed down, after second of coating spraying, coating is heated, and formation is uniform in coating rapidly for generation steam
Cavity, then coating surface, which produces, ruptures, and gas overflowing dope layer, finally produces many holes in coating surface, is follow-up
The type that fills of cast iron liquid provides space, ensures the uniform raised burr of blank surface generation.The application is used and poured with same
Two kinds of different coatings of spraying in pipe die are noted, while ensureing outer wall of cylinder jachet burr formation, cast pipe die is reduced and is led from iron liquid
The heat walked, improves the mold-filling capacity of iron liquid, and burr formation is preferable, high uniformity, and metallographic structure is good, and processing performance improves.
Second of the coating that the present invention uses is the masking liquid in patent CN2014108380494, its concrete component and system
Standby process is also discussed in detail in patent CN2014108380494.
In cylinder jacket metallographic of the present invention more than A type graphite >=80%, 4-7 grades of length, matrix is fine platy pearl
Body of light, for ferrite no more than 3%, the quantity of carbide and iron phosphide eutectic is not more than 5%, both should be in interrupted net distribution or uniform
Distribution, mechanical performance meet customer requirement, and the pipe die inner wall situation of pulling significantly reduces, and the service life of mould greatly improves；And cylinder
Set processing performance improves.
Brief description of the drawings
Fig. 1 is spraying process schematic diagram of the present invention；1 is spraying trolley in Fig. 1, and 21 be the first spray station, and 22 be second
Spray station, 3 be spraying guide rail, and 41 be the first coating pressure tank, and 42 be the second coating pressure tank, and 5 be air accumulator, and 6 be cast
Pipe die guide rail, 7 be cast pipe die；
Fig. 2 is that the cast pipe die of existing process only sprays 100 times of cylinder jacket finished product wear surface graphite amplification prepared by one layer of coating
Photo；As shown in Figure 2, A type graphite 65%, b type eraphite 20%, D types graphite 5%, E types graphite 10%, 6-7 grades of graphite rank；
Fig. 3 is that embodiment 1 pours into a mould the photograph that pipe die sprays 100 times of cylinder jacket finished product wear surface graphite amplification prepared by two layers of coatings
Piece；From the figure 3, it may be seen that A type graphite more than 95%, 4-6 grades of graphite rank；
Fig. 4 is that the cast pipe die of existing process only sprays cylinder jacket finished product wear surface matrix amplification prepared by one layer of coating
100 times of photo；As shown in Figure 4, matrix medium pearlite 94%, ferrite 4%, carbide 2%, pearlite piece spacing are thick sheet；
Fig. 5 is that cylinder jacket finished product wear surface matrix prepared by embodiment 1 pours into a mould pipe die spraying two layers of coatings amplifies 100 times
Photo；As shown in Figure 5, matrix medium pearlite is more than 97%, and pearlite spacing is fine platy.
Embodiment
Technical scheme is described in further details below in conjunction with specific embodiment, but the protection model of the present invention
Enclose and be not limited thereto.
Embodiment 1
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the burr cylinder jacket chemical composition that this example is provided
It is as follows：
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps：
（1）Each raw material is accurately weighed, using medium-frequency induction furnace melting, adds the carborundum powder for accounting for iron liquid quality 0.1%（Granularity
0.2~10mm）, 1550 DEG C of control iron liquid tapping temperature；
（2）The preparation of coating：By bentonite and water according to mass ratio 1:10 mixing, after stirring 10 hours, it is molten to weigh 100kg
Liquid, adds 16kg diatomite（- 300 mesh account for more than 70%）, be stirred for 1.5 it is small when after, as shown in Figure 1, the coating being stirred is added
Enter in the first coating pressure tank 41, adjustment 41 pressure of the first coating pressure tank is 0.15MPa, and preprepared is applied for second
Material is added in the second coating pressure tank 42, and the pressure of the second coating pressure tank 42 of adjustment is 0.4MPa；
（3）The cast pipe die 7 of centrifugal casting machine is preheating to 300 DEG C, cast pipe die 7 is moved on to the by pouring into a mould pipe die guide rail 7
One spray station 21, the rotating speed of centrifugal casting pipe die 7 is 1100r/min, and the spraying rate of spraying trolley 1 is 80mm/s, is passed through
Spray trolley 1 and complete a spraying in the movement of spraying guide rail 1 and the rotation of cast pipe die 7, first is formed after spraying 6 times coating
Layer coating, cast pipe die 7 are rotated further 30-60 seconds after the drying of first layer coating, stop the observation cast of centrifugal casting machine testing
7 inside coating thickness of pipe die is 0.12mm, and coating surface is smooth, smooth；Cast pipe die 7 is gone into the second spray station 22, is opened
The fluffy coating of the dynamic centrifugal casting machine spraying second layer, the rotating speed of cast pipe die 7 are 1500 r/min, gate spool after the completion of spraying
Mould 7 is rotated further 70 seconds so that coating is completely dried, and constantly being got angry by inward wall produces certain hole, second layer coating
Thickness is 0.8mm；
（4）Cast：Mode will be bred using following current add and account for 0.7% silicon strontium inovulant of iron liquid weight（The special conjunction in peak is cast purchased from Ningxia
Golden Co., Ltd）The iron liquid casting of processing to cast pipe die inner wall, pouring temperature be 1420 DEG C, under the influence of centrifugal force with it is cold
But uniformly raised burr will be formed in the outer surface of blank after crystallizing.
The sample prepared by technique productions blank carried out metallographic observation in the past, and as a result A type graphite amount is in 60-80%, graphite length
5-7 grades, ferrite content 4-5% of degree, iron phosphide eutectic+carbide are not more than 2%（Such as Fig. 2 and Fig. 4）；Die life less than 10000,
There have been pull phenomenon for mould inner wall, it is necessary to which mould endoporus is repaired；The experiment of cylinder sleeve chip processing performance shows：It is same
Knife can be processed 100-150 cylinder sleeve.
Carry out metallographic observation to prepared sample, more than+97% pearlite of A type graphite of the testing result more than 95%+
A small amount of ferrite and iron phosphide eutectic, 4-6 grades of graphite size（Such as Fig. 3 and Fig. 5）；The service life of mould can reach 18000-20000 only, arrive
Mould inner wall does not also occur pulling phenomenon when mould is scrapped, and the experiment of cylinder sleeve chip processing performance shows：It is same that knife can be processed
150-200 cylinder sleeve, abrasion of the cylinder sleeve to cutter diminish, and cylinder sleeve processing performance improves.
Embodiment 2
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the burr cylinder jacket chemical composition that this example is provided
It is as follows：
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps：
（1）Each raw material is accurately weighed, using medium-frequency induction furnace melting, adds the carborundum powder for accounting for iron liquid quality 0.15%（Granularity
0.2~10mm）, 1500 DEG C of control iron liquid tapping temperature；
（2）The preparation of coating：By bentonite and water according to mass ratio 1:10 mixing, after stirring 11 hours, it is molten to weigh 100kg
Liquid, adds 15kg diatomite（- 300 mesh account for more than 70%）, be stirred for 1 it is small when after, as shown in Figure 1, by the coating being stirred add
In first coating pressure tank 41, adjustment 41 pressure of the first coating pressure tank is 0.1MPa, by second of coating of preprepared
Add in the second coating pressure tank 42, the pressure of the second coating pressure tank 42 of adjustment is 0.3MPa；
（3）The cast pipe die 7 of centrifugal casting machine is preheating to 150 DEG C, cast pipe die 7 is moved on to the by pouring into a mould pipe die guide rail 7
One spray station 21, the rotating speed of centrifugal casting pipe die 7 is 1000r/min, and the spraying rate of spraying trolley 1 is 80mm/s, is passed through
Spray trolley 1 and complete a spraying in the movement of spraying guide rail 1 and the rotation of cast pipe die 7, first is formed after spraying 4 times coating
Layer coating, cast pipe die 7 are rotated further 30-60 seconds after the drying of first layer coating, stop the observation cast of centrifugal casting machine testing
7 inside coating thickness of pipe die is 0.05mm, and coating surface is smooth, smooth；Cast pipe die 7 is gone into the second spray station 22, is opened
The fluffy coating of the dynamic centrifugal casting machine spraying second layer, the rotating speed of cast pipe die 7 are 1400 r/min, gate spool after the completion of spraying
Mould 7 is rotated further 50 seconds so that coating is completely dried, and constantly being got angry by inward wall produces certain hole, second layer coating
Thickness is 0.3mm；
（4）Cast：Mode will be bred using following current add and account for 0.4% silicon strontium inovulant of iron liquid weight（The special conjunction in peak is cast purchased from Ningxia
Golden Co., Ltd）The iron liquid casting of processing to cast pipe die inner wall, pouring temperature be 1350 DEG C, under the influence of centrifugal force with it is cold
But uniformly raised burr will be formed in the outer surface of blank after crystallizing.
Carry out metallographic observation to prepared sample, more than+97% pearlite of A type graphite of the testing result more than 90%+
A small amount of ferrite and iron phosphide eutectic, 4-6 grades of graphite size；The service life of mould can reach 18000-20000 only, mould when being scrapped to mould
Tool inner wall does not also occur pulling phenomenon, and the experiment of cylinder sleeve chip processing performance shows：It is same that knife can be processed 150-200 cylinder
Set, abrasion of the cylinder sleeve to cutter diminish, and cylinder sleeve processing performance improves.
The sample prepared by technique productions blank carried out metallographic observation in the past, and as a result A type graphite amount is in 60-80%, graphite length
5-7 grades, ferrite content 4-5% of degree, iron phosphide eutectic+carbide are not more than 5%, and die life, mould inner wall just went out less than 10000
Show and pulled phenomenon, it is necessary to which mould endoporus has been repaired；The experiment of cylinder sleeve chip processing performance shows：It is same that knife can be processed
100-150 cylinder sleeve.
Embodiment 3
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the burr cylinder jacket chemical composition that this example is provided
It is as follows：
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps：
（1）Each raw material is accurately weighed, using medium-frequency induction furnace melting, adds the carborundum powder for accounting for iron liquid quality 0.2%（Granularity
0.2~10mm）, 1550 DEG C of control iron liquid tapping temperature；
（2）The preparation of coating：By bentonite and water according to mass ratio 1:10 mixing, after stirring 12 hours, it is molten to weigh 100kg
Liquid, adds 20kg diatomite（- 300 mesh account for more than 70%）, be stirred for 2 it is small when after, as shown in Figure 1, by the coating being stirred add
In first coating pressure tank 41, adjustment 41 pressure of the first coating pressure tank is 0.2MPa, by second of coating of preprepared
Add in the second coating pressure tank 42, the pressure of the second coating pressure tank 42 of adjustment is 0.5MPa；
（3）The cast pipe die 7 of centrifugal casting machine is preheating to 450 DEG C, cast pipe die 7 is moved on to the by pouring into a mould pipe die guide rail 7
One spray station 21, the rotating speed of centrifugal casting pipe die 7 is 1300r/min, and the spraying rate of spraying trolley 1 is 80mm/s, spraying 6
First layer coating is formed after coating, cast pipe die 7 is rotated further 30-60 seconds after the drying of first layer coating, stops centrifugation and pour
It is 0.3mm to note machine testing observation cast 7 inside coating thickness of pipe die, and coating surface is smooth, smooth；Cast pipe die 7 is gone to the
Two spray stations 22, start the fluffy coating of the centrifugal casting machine spraying second layer, the rotating speed for pouring into a mould pipe die is 1700 r/min, spray
Pour into a mould pipe die 7 after the completion of painting to be rotated further 60 seconds so that coating is completely dried, constantly getting angry by inward wall produces certain hole
Hole, the thickness of second layer coating is 1.1mm；
（4）Cast：The iron liquid casting for accounting for the processing of 0.8% silicon strontium inovulant of iron liquid weight is added to pouring by mode is bred using following current
Pipe die inner wall is noted, pouring temperature is 1450 DEG C, will be formed in the outer surface of blank with after crystallisation by cooling under the influence of centrifugal force
Uniformly raised burr.
Carry out metallographic observation to prepared sample, more than+97% pearlite of A type graphite of the testing result more than 90%+
A small amount of ferrite and iron phosphide eutectic, 4-6 grades of graphite size；The service life of mould can reach 18000-20000 only, mould when being scrapped to mould
Tool inner wall does not also occur pulling phenomenon, and the experiment of cylinder sleeve chip processing performance shows：It is same that knife can be processed 150-200 cylinder
Set.
The sample prepared by technique productions blank carried out metallographic observation in the past, and as a result A type graphite amount is in 60-80%, graphite length
5-7 grades, ferrite content 4-5% of degree, iron phosphide eutectic+carbide are not more than 5%, and die life, mould inner wall just went out less than 10000
Show and pulled phenomenon, it is necessary to which mould endoporus has been repaired；The experiment of cylinder sleeve chip processing performance shows：It is same that knife can be processed
100-150 cylinder sleeve.
Claims (3)
1. a kind of burr cylinder jacket of centrifugal casting, it is characterized in that, by weight percentage, the chemical composition of burr cylinder jacket
For：Carbon：2.8-3.7%；Sulphur：0.03-0.08%；Silicon：1.7-2.8%；0 ＜ phosphorus≤0.5%；Manganese：0.5-1.0%；0 ＜ chromium≤0.4%；
Copper：0.1-0.6%, surplus are iron.
2. the preparation method of the burr cylinder jacket of centrifugal casting described in claim 1, it is characterized in that, include the following steps：（1）It is accurate
Each raw material is really weighed, using medium-frequency induction furnace melting, adds the pretreating agent for accounting for iron liquid quality 0.1 ~ 0.2%, control iron liquid goes out
1500-1550 DEG C of furnace temperature；
（2）The preparation of coating：By bentonite and water according to 1:（8~12）Mass ratio be mixed and stirred for 10-12 it is small when, choose
100kg solution add 15-20kg diatomite stirring 1-2 it is small when after stand at least 4 it is small when, be made the first coating；
（3）The first coating configured is respectively charged into the first coating pressure tank, second of coating loads the second coating pressure
Tank is to form uniform cavity on the surface of cast pipe die inner wall, and the pressure of the first coating pressure tank is 0.1-0.2MPa, and second applies
The pressure for expecting pressurized tank is 0.3-0.5MPa；
（4）The cast pipe die of centrifugal casting machine is preheating to 150-450 DEG C, the first coating then is sprayed to cast pipe die, if
The rotating speed for putting cast pipe die is 1000-1300r/min, and the first layer coating of 0.05-0.3mm thickness is formed in cast pipe die inner wall,
After the drying of first layer coating, to pouring into a mould pipe die inner-wall spraying second layer coating, the rotating speed for pouring into a mould pipe die is 1400 ~ 1700 r/
Min, the thickness of second layer coating is 0.3 ~ 1.1mm, and to be coated be completely dried can be poured into a mould；
（5）Melting qualification iron liquid is poured into a mould after inoculation, and 1350-1450 DEG C of pouring temperature, is bred using following current,
The addition of inovulant is cast iron liquid quality 0.4-0.8%, is poured into cast pipe die, cools down after molten steel preparation processing to obtain the final product
Burr cylinder jacket.
3. the preparation method of the burr cylinder jacket of centrifugal casting according to claim 2, it is characterized in that, the step（2）In
- 300 mesh of diatomite granularity requirements accounts for more than 70%.
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| CN108690937A (en) * | 2018-06-13 | 2018-10-23 | 中原内配集团安徽有限责任公司 | A kind of production method of wearproof engine cylinder sleeve |
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| CN108906394A (en) * | 2018-07-05 | 2018-11-30 | 广安耀业机械制造有限公司 | A kind of equipment for processing anti-burr cylinder sleeve |
| CN109594011A (en) * | 2019-01-23 | 2019-04-09 | 中国科学院光电技术研究所 | Applied to high-precision inside and outside circle, the grinding cast iron of plane lapping and its manufacturing method |
| CN110923563A (en) * | 2019-12-17 | 2020-03-27 | 赵明 | Wear-resistant cylinder sleeve for diesel engine and preparation process thereof |
| CN111659868A (en) * | 2019-03-08 | 2020-09-15 | 中原内配集团股份有限公司 | Novel cylinder sleeve and preparation method thereof |
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| CN111690867A (en) * | 2020-07-08 | 2020-09-22 | 中原内配集团股份有限公司 | Alloy cast iron and preparation method thereof |
| CN111852681A (en) * | 2020-07-28 | 2020-10-30 | 中原内配集团安徽有限责任公司 | Low-density burr cylinder jacket |
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