CN103350203A - Compound centrifugal casting method for large-scale ring piece - Google Patents
Compound centrifugal casting method for large-scale ring piece Download PDFInfo
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- CN103350203A CN103350203A CN2013102248789A CN201310224878A CN103350203A CN 103350203 A CN103350203 A CN 103350203A CN 2013102248789 A CN2013102248789 A CN 2013102248789A CN 201310224878 A CN201310224878 A CN 201310224878A CN 103350203 A CN103350203 A CN 103350203A
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Abstract
The invention discloses a compound centrifugal casting method for a large-scale ring piece, which comprises the following operation steps: 1) manufacturing a casting mould, and according to the specification and the size of the large-scale ring piece, designing the casting mould, and preparing thermal insulation coating material, wherein the thermal insulation coating material is water-based coating material based on ZnO, and comprises the following materials by mass: 2.5 to 3.5 % of boric acid, 1.2 to 1.5% of alkyl sodium sulfonate, 2.0 to 3.0% of Na2SiO3 and 3.0 to 3.5% of zircon powder; uniformly coating the thermal insulation coating material on the inner surface of the mould through a coating slurry rolling and hanging method to enable the thickness of the coating material to be 3 to 7 mm, drying the mould after the coating, preserving heat for 1 to 2 hours, and preheating the coated mould to 220 to 260 DEG C. The outer layer of the large-scale ring piece provided by the invention has good wearing resistance and rigidity, the material comprehensive utilization rate on the outer side and at the middle and core parts is improved by more than 10%, meanwhile the service life is prolonged by more than 30 % as compared with the static casting technology, the metal feeding effect is good, and the outer layer organization of the casting is compact.
Description
Technical field
The invention belongs to casting technology field, relate to a kind of method of large ring composite centrifugal casting.
Background technology
Centrifugal casting pours into liquid metal in the casting mold of rotation, at the centrifugal action lower charging type and be frozen into the casting method of foundry goods.The characteristics of centrifugal casting are molten metals at the centrifugal action lower charging type and solidify, and the metal feeding is effective, and the foundry goods outer tissue is fine and close, and non-metallic inclusion is few, good mechanical property; Without moulding, coremaking, associated materials and equipment investment have been saved.The casting hollow foundry goods does not need dead head, and using rate of metal can improve greatly.Therefore concerning the foundry goods of some given shape, centrifugal casting is a kind of technique of saving material, saving energy consumption, high benefit.
In the foundry goods large ring manufacture process of reality, there is the unmanageable problem of key process parameter, the defective such as easily produce the volume gas of large ring and be mingled with, the casting quality of production is unstable, and core is combined bad with working lining and the problem such as working lining thickness drop is large.
Summary of the invention
The present invention is directed to the deficiency that exists in prior art manufacturing and the use procedure, a kind of method of large ring composite centrifugal casting is provided, skin has good wearability and hardness, and the outside and middle part, core, the material comprehensive utilization ratio has improved more than 10%, service life, more static casting technique improved more than 30% simultaneously, and the metal feeding is effective, and the foundry goods outer tissue is fine and close.
Technical scheme of the present invention is as follows:
The method of large ring composite centrifugal casting includes following operating procedure:
1) make casting mould, according to the large ring specification, design casting mould, preparation insulating moulding coating, insulating moulding coating are that adding mass fraction is the boric acid of 2.5-3.5%, the sodium alkyl sulfonate of 1.2-1.5%, the Na of 2.0-3.0% take the water based paint of ZnO as the basis
2SiO
3, 3.0-3.5% zirconium English powder; Roll the extension method and described insulating moulding coating evenly is coated with hangs on the mould inner surface with being coated with slip, paint thickness 3-7mm, after being coated with mould oven dry insulation 1-2 hour, with the mould and die preheating after being coated with to 220-260 ℃;
2) outer centrifugal casting step: after the outer molten steel, the chemical component weight percentage of each element should satisfy following requirement: C 0.24～0.30%, Mn 0.12～0.20%, Cr 0.06-0.12%, Si 0.15～0.25%, Mg 0.03-0.05%, P 0.014-0.025%, Ni 0.078～0.12%, tungsten 0.035～0.045%, Sn 0.04-0.06% in the control molten steel, surplus Fe, the molten steel tapping temperature is 1500 ℃～1600 ℃, by 3～6kg/m
2Add covering slag and carry out the calmness processing, outer pouring temperature is 1400 ℃～1480 ℃, constantly passes into hybrid protection gas in mould and casting ladle in whole casting process, and hybrid protection gas is by following volume ratio gas composition: Ar:SF
6: N
2=50%:30%:20%; Cold type inner wall rotational line speed is controlled at 24～30m/s;
3) intermediate layer and core centrifugal casting step: following weight portion raw material is put into melting in the intermediate frequency furnace: the aluminium ingot of the desulfurizing agent of the coke of 1.2-2.4 part, 2.5-4.0 part, the sponge iron of 3.4-4.6 part, 2.6-3.3 part, the steel scrap of 54-68 part and the foundry returns of 12-15 part, before heating crucible inwall and bottom even sprinkle one deck flux, various composition quality marks are in the solvent: 30-40%MgCl
2, 20-30%KCl, 5-8%CaF
2, 10-20%BaCl
2, surplus is SiO
2The molten steel tapping temperature is 1550 ℃～1600 ℃, treat to pour into a mould when outer inwall interface temperature drops to 1320 ℃～1360 ℃ the intermediate layer, the pouring molten steel temperature is 1500 ℃～1550 ℃, the cold mould rotary speed keeps 1350-1400r/min, after intermediate layer thickness reaches 95～115mm, fill core to casting mold inside and obtain large ring composite centrifugal strand;
4) large ring composite centrifugal strand is heat-treated step: large ring composite centrifugal strand is heated to 590-650 ℃, kept 4-5 hour, in 40-50 minute, be warming up to 850-950 ℃ again, carry out quench cooled with quenching oil, large ring after will quenching again carried out under 450-480 ℃ tempering 45-55 minute, from tempering furnace, take out again put into 300-350 ℃ tempering oil with oily slow cooling;
5) large ring after the heat treatment is carried out turning processing, select the inside and outside footpath of lathe turning large ring and length to reach design size, obtain the finished product large ring;
6) finished product large ring surface middle temperature phosphating is processed: carry out under 60-70 ℃ temperature, the free acidity of phosphate solution is 1 in the ratio of total acidity: 10-12, the processing time is 9-13 minute.
Various composition quality marks are in the described solvent: 35%MgCl
2, 25%KCl, 6%CaF
2, 15%BaCl
2
Compared with prior art, the present invention adopts the Multi-layer centrifugal compound casting technique, cast is outer respectively under the effect of centrifugal force, intermediate layer and core, can make like this skin have higher wearability, core has higher obdurability, high through suitable heat treatment acquisition core intensity and toughness, the compound large ring finished product that working lining hardness and wearability are good, namely by differential temperature heat treatment the combination property of large ring is further enhanced, fundamentally solved the problem that exists in existing large ring manufacturing and the use, the compound large ring of manufacturing of the present invention is compared with static casting large-scale ring, and improved more than 25% service life.
The compound cast steel supporting roll technical performance index that the inventive method is made is as follows:
Large ring inwall hardness greater than 64HSD, large ring outer wall hardness greater than 35HSD, hardness inhomogeneities less than 4HSD, large ring tensile strength greater than 1050Mpa, yield strength greater than 670Mpa, roll neck tensile strength greater than 655Mpa, there is not the defective greater than equivalent diameter 2mm in the 144mm degree of depth of large ring surface in ultrasonic examination.
The specific embodiment
The method of large ring composite centrifugal casting includes following operating procedure:
1) make casting mould, according to the large ring specification, design casting mould, preparation insulating moulding coating, insulating moulding coating are that adding mass fraction is the boric acid of 2.5-3.5%, the sodium alkyl sulfonate of 1.2-1.5%, the Na of 2.0-3.0% take the water based paint of ZnO as the basis
2SiO
3, 3.0-3.5% zirconium English powder; Roll the extension method and described insulating moulding coating evenly is coated with hangs on the mould inner surface with being coated with slip, paint thickness 3-7mm, after being coated with mould oven dry insulation 1-2 hour, with the mould and die preheating after being coated with to 220-260 ℃;
2) outer centrifugal casting step: after the outer molten steel, the chemical component weight percentage of each element should satisfy following requirement: C 0.24～0.30%, Mn 0.12～0.20%, Cr 0.06-0.12%, Si 0.15～0.25%, Mg 0.03-0.05%, P 0.014-0.025%, Ni 0.078～0.12%, tungsten 0.035～0.045%, Sn 0.04-0.06% in the control molten steel, surplus Fe, the molten steel tapping temperature is 1500 ℃～1600 ℃, by 3～6kg/m
2Add covering slag and carry out the calmness processing, outer pouring temperature is 1400 ℃～1480 ℃, constantly passes into hybrid protection gas in mould and casting ladle in whole casting process, and hybrid protection gas is by following volume ratio gas composition: Ar:SF
6: N
2=50%:30%:20%; Cold type inner wall rotational line speed is controlled at 24～30m/s;
3) intermediate layer and core centrifugal casting step: following weight portion raw material is put into melting in the intermediate frequency furnace: the aluminium ingot of the desulfurizing agent of the coke of 1.2-2.4 part, 2.5-4.0 part, the sponge iron of 3.4-4.6 part, 2.6-3.3 part, the steel scrap of 54-68 part and the foundry returns of 12-15 part, before heating crucible inwall and bottom even sprinkle one deck flux, various composition quality marks are in the solvent: 35%MgCl
2, 25%KCl, 6%CaF
2, 15%BaCl
2The molten steel tapping temperature is 1550 ℃～1600 ℃, treat to pour into a mould when outer inwall interface temperature drops to 1320 ℃～1360 ℃ the intermediate layer, the pouring molten steel temperature is 1500 ℃～1550 ℃, the cold mould rotary speed keeps 1350-1400r/min, after intermediate layer thickness reaches 95～115mm, fill core to casting mold inside and obtain large ring composite centrifugal strand;
4) large ring composite centrifugal strand is heat-treated step: large ring composite centrifugal strand is heated to 590-650 ℃, kept 4-5 hour, in 40-50 minute, be warming up to 850-950 ℃ again, carry out quench cooled with quenching oil, large ring after will quenching again carried out under 450-480 ℃ tempering 45-55 minute, from tempering furnace, take out again put into 300-350 ℃ tempering oil with oily slow cooling;
5) large ring after the heat treatment is carried out turning processing, select the inside and outside footpath of lathe turning large ring and length to reach design size, obtain the finished product large ring.
6) finished product large ring surface middle temperature phosphating is processed: carry out under 60-70 ℃ temperature, the free acidity of phosphate solution is 1 in the ratio of total acidity: 10-12, the processing time is 9-13 minute.
Claims (2)
1. the method for large ring composite centrifugal casting is characterized in that: include following operating procedure:
1) make casting mould, according to the large ring specification, design casting mould, preparation insulating moulding coating, insulating moulding coating are that adding mass fraction is the boric acid of 2.5-3.5%, the sodium alkyl sulfonate of 1.2-1.5%, the Na of 2.0-3.0% take the water based paint of ZnO as the basis
2SiO
3, 3.0-3.5% zirconium English powder; Roll the extension method and described insulating moulding coating evenly is coated with hangs on the mould inner surface with being coated with slip, paint thickness 3-7mm, after being coated with mould oven dry insulation 1-2 hour, with the mould and die preheating after being coated with to 220-260 ℃;
2) outer centrifugal casting step: after the outer molten steel, the chemical component weight percentage of each element should satisfy following requirement: C 0.24～0.30%, Mn 0.12～0.20%, Cr 0.06-0.12%, Si 0.15～0.25%, Mg 0.03-0.05%, P 0.014-0.025%, Ni 0.078～0.12%, tungsten 0.035～0.045%, Sn 0.04-0.06% in the control molten steel, surplus Fe, the molten steel tapping temperature is 1500 ℃～1600 ℃, by 3～6kg/m
2Add covering slag and carry out the calmness processing, outer pouring temperature is 1400 ℃～1480 ℃, constantly passes into hybrid protection gas in mould and casting ladle in whole casting process, and hybrid protection gas is by following volume ratio gas composition: Ar:SF
6: N
2=50%:30%:20%; Cold type inner wall rotational line speed is controlled at 24～30m/s;
3) intermediate layer and core centrifugal casting step: following weight portion raw material is put into melting in the intermediate frequency furnace: the aluminium ingot of the desulfurizing agent of the coke of 1.2-2.4 part, 2.5-4.0 part, the sponge iron of 3.4-4.6 part, 2.6-3.3 part, the steel scrap of 54-68 part and the foundry returns of 12-15 part, before heating crucible inwall and bottom even sprinkle one deck flux, various composition quality marks are in the solvent: 30-40%MgCl
2, 20-30%KCl, 5-8%CaF
2, 10-20%BaCl
2, surplus is SiO
2The molten steel tapping temperature is 1550 ℃～1600 ℃, treat to pour into a mould when outer inwall interface temperature drops to 1320 ℃～1360 ℃ the intermediate layer, the pouring molten steel temperature is 1500 ℃～1550 ℃, the cold mould rotary speed keeps 1350-1400r/min, after intermediate layer thickness reaches 95～115mm, fill core to casting mold inside and obtain large ring composite centrifugal strand;
4) large ring composite centrifugal strand is heat-treated step: large ring composite centrifugal strand is heated to 590-650 ℃, kept 4-5 hour, in 40-50 minute, be warming up to 850-950 ℃ again, carry out quench cooled with quenching oil, large ring after will quenching again carried out under 450-480 ℃ tempering 45-55 minute, from tempering furnace, take out again put into 300-350 ℃ tempering oil with oily slow cooling;
5) large ring after the heat treatment is carried out turning processing, select the inside and outside footpath of lathe turning large ring and length to reach design size, obtain the finished product large ring;
6) finished product large ring surface middle temperature phosphating is processed: carry out under 60-70 ℃ temperature, the free acidity of phosphate solution is 1 in the ratio of total acidity: 10-12, the processing time is 9-13 minute.
2. the method for large ring composite centrifugal according to claim 1 casting, it is characterized in that: various composition quality marks are in the described solvent: 35%MgCl
2, 25%KCl, 6%CaF
2, 15%BaCl
2
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103692160A (en) * | 2013-12-11 | 2014-04-02 | 马鞍山市华科实业有限公司 | Forging method for stabilizer bar used for excavator |
| CN103706742A (en) * | 2013-12-11 | 2014-04-09 | 马鞍山市华科实业有限公司 | Machining method of automobile rocker |
| CN103934426A (en) * | 2014-04-21 | 2014-07-23 | 东北大学 | Copper/iron bi-metal composite strip and plate manufacturing method |
| CN104439219A (en) * | 2014-10-27 | 2015-03-25 | 大丰市洪联铸钢有限责任公司 | Steel ring billet casting technique based on casting and rolling combined forming |
| CN105170934A (en) * | 2015-09-23 | 2015-12-23 | 定州市金华蓝天汽车零部件有限公司 | Centrifugal casting method for composite ring with Q345B steel inner layer and 40Cr steel outer layer |
| CN108927502A (en) * | 2018-06-28 | 2018-12-04 | 卓然(靖江)设备制造有限公司 | A kind of centrifugal casting low melting point covering slag |
| CN111804877A (en) * | 2020-07-10 | 2020-10-23 | 马鞍山市广源法兰环件有限公司 | Local connection machining forming process for large ring piece |
| CN112643002A (en) * | 2020-12-22 | 2021-04-13 | 云南云铝海鑫铝业有限公司 | Low-cost T-shaped aluminum ingot surface quality control method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5316068A (en) * | 1989-01-20 | 1994-05-31 | Aisin Seiki Kabushiki Kaisha | Method for producing casting with functional gradient |
| CN1456708A (en) * | 2003-05-21 | 2003-11-19 | 中国重型汽车集团有限公司 | High-strength toughness differential mechanism universal joint pin machining process |
| CN101480663A (en) * | 2009-01-21 | 2009-07-15 | 唐山先隆轧辊实业有限公司 | High-alloy centrifugal compound cast steel supporting roll and manufacturing technology thereof |
| CN101519708A (en) * | 2009-04-20 | 2009-09-02 | 芜湖市金贸流体科技股份有限公司 | Production method of spheroidal graphite cast iron with high tenacity and corrosion resistance |
| CN101555565A (en) * | 2008-04-11 | 2009-10-14 | 广西玉柴机器股份有限公司 | Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting |
| CN202022981U (en) * | 2011-03-08 | 2011-11-02 | 盘锦辽河油田派普钻具制造有限公司 | Automatic intermediate-temperature phosphating machine for drill collar thread |
| CN102303065A (en) * | 2011-06-21 | 2012-01-04 | 攀钢集团成都钢钒有限公司 | Method for manufacturing seamless steel tube for vehicle-mounted large-diameter high pressure gas cylinder |
| CN102601338A (en) * | 2012-03-21 | 2012-07-25 | 重庆大学 | Method for producing large magnesium alloy ring by means of centrifugal casting |
| CN102950269A (en) * | 2012-11-28 | 2013-03-06 | 江苏共昌轧辊股份有限公司 | Manufacturing method of vertical centrifugal composite cast steel supporting roll |
-
2013
- 2013-06-07 CN CN2013102248789A patent/CN103350203A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5316068A (en) * | 1989-01-20 | 1994-05-31 | Aisin Seiki Kabushiki Kaisha | Method for producing casting with functional gradient |
| CN1456708A (en) * | 2003-05-21 | 2003-11-19 | 中国重型汽车集团有限公司 | High-strength toughness differential mechanism universal joint pin machining process |
| CN101555565A (en) * | 2008-04-11 | 2009-10-14 | 广西玉柴机器股份有限公司 | Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting |
| CN101480663A (en) * | 2009-01-21 | 2009-07-15 | 唐山先隆轧辊实业有限公司 | High-alloy centrifugal compound cast steel supporting roll and manufacturing technology thereof |
| CN101519708A (en) * | 2009-04-20 | 2009-09-02 | 芜湖市金贸流体科技股份有限公司 | Production method of spheroidal graphite cast iron with high tenacity and corrosion resistance |
| CN202022981U (en) * | 2011-03-08 | 2011-11-02 | 盘锦辽河油田派普钻具制造有限公司 | Automatic intermediate-temperature phosphating machine for drill collar thread |
| CN102303065A (en) * | 2011-06-21 | 2012-01-04 | 攀钢集团成都钢钒有限公司 | Method for manufacturing seamless steel tube for vehicle-mounted large-diameter high pressure gas cylinder |
| CN102601338A (en) * | 2012-03-21 | 2012-07-25 | 重庆大学 | Method for producing large magnesium alloy ring by means of centrifugal casting |
| CN102950269A (en) * | 2012-11-28 | 2013-03-06 | 江苏共昌轧辊股份有限公司 | Manufacturing method of vertical centrifugal composite cast steel supporting roll |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103692160A (en) * | 2013-12-11 | 2014-04-02 | 马鞍山市华科实业有限公司 | Forging method for stabilizer bar used for excavator |
| CN103706742A (en) * | 2013-12-11 | 2014-04-09 | 马鞍山市华科实业有限公司 | Machining method of automobile rocker |
| CN103706742B (en) * | 2013-12-11 | 2016-03-09 | 马鞍山市华科实业有限公司 | A kind of processing method of automobile rocker |
| CN103934426A (en) * | 2014-04-21 | 2014-07-23 | 东北大学 | Copper/iron bi-metal composite strip and plate manufacturing method |
| CN104439219A (en) * | 2014-10-27 | 2015-03-25 | 大丰市洪联铸钢有限责任公司 | Steel ring billet casting technique based on casting and rolling combined forming |
| CN104439219B (en) * | 2014-10-27 | 2016-09-14 | 大丰市洪联铸钢有限责任公司 | A kind of casting technique of steel loop base based on casting and rolling composite forming |
| CN105170934A (en) * | 2015-09-23 | 2015-12-23 | 定州市金华蓝天汽车零部件有限公司 | Centrifugal casting method for composite ring with Q345B steel inner layer and 40Cr steel outer layer |
| CN105170934B (en) * | 2015-09-23 | 2017-07-25 | 定州市金华蓝天汽车零部件有限公司 | A kind of internal layer Q345B outer layers 40Cr is combined the centre spinning method of ring |
| CN108927502A (en) * | 2018-06-28 | 2018-12-04 | 卓然(靖江)设备制造有限公司 | A kind of centrifugal casting low melting point covering slag |
| CN111804877A (en) * | 2020-07-10 | 2020-10-23 | 马鞍山市广源法兰环件有限公司 | Local connection machining forming process for large ring piece |
| CN112643002A (en) * | 2020-12-22 | 2021-04-13 | 云南云铝海鑫铝业有限公司 | Low-cost T-shaped aluminum ingot surface quality control method |
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Application publication date: 20131016 |