CN101885044B - Covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof - Google Patents
Covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof Download PDFInfo
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- CN101885044B CN101885044B CN2010102288104A CN201010228810A CN101885044B CN 101885044 B CN101885044 B CN 101885044B CN 2010102288104 A CN2010102288104 A CN 2010102288104A CN 201010228810 A CN201010228810 A CN 201010228810A CN 101885044 B CN101885044 B CN 101885044B
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- coverture
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- covering agent
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Abstract
The invention relates to a covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof. The covering agent consists of the following components in percentage by weight: 40 to 70 percent of cryolite, 2 to 10 percent of phosphor copper master alloy and the balance of charcoal ash, wherein the summation of the percentage by weight of each component is 100 percent. When the covering agent is applied to the vertical semi-continuous casting of the aluminum bronze, a 'thin covering' technique is adopted, namely a round porous mesh screen is fixed on a crystallizer, the cover agent is placed in the mesh screen, and during casting, along with the vibration of the crystallizer, the powdered covering agent in the mesh screen is uniformly scattered on the surface of a fused mass, and the covering thickness is only 0.5 to 2 mm. The covering agent not only can reduce the defects of slug inclusion on an ingot casting surface layer, gas holes, cold shut and the like, but also can reduce the depth of the slug inclusion in an ingot, so the ingot surface quality is high, the finished product rate is improved by 10 to 40 percent, and the ingot has high mechanical properties. When applied to the casting of the aluminum bronze, the covering agent can also improve the production efficiency of casting of the aluminum bronze by 15 to 35 percent, and prolong the service life of the crystallizer by 50 to 80 percent. The covering agent is simple and convenient to prepare, has a low use cost, and is simple for production operation.
Description
Technical field
The invention belongs to field of new.Relate to a kind of coverture and application thereof that is used for vertical semi-continuous casting of aluminum bronze.
Background technology
Aluminium bronze is a kind of high-strength structure material of extensive use in the machine-building, is widely used in making various high-strength wearable parts because have excellent mechanics and wear-resisting, decay resistance, all plays a part very important civilian with military industry field.
Owing to contain the aluminium of higher amount, oxidation tendency is very serious in the aluminium bronze, air-breathingly easily in fusion-casting process generates Al with oxidation
2O
3The Al of complete densification
2O
3Film can stop the continuation oxidation of copper liquid, but the rolling to melt in the vibration of the stirring of melt, crystallizer and the crystallizer all might make fine and close Al in the fusion process
2O
3Film breaks becomes block Al
2O
3And lose protective effect.The block Al that is present in the melt top layer in the casting process
2O
3Along with melt rolls to crystallizer wall, and then be pressed in the gap of ingot casting and crystallizer wall and form Al
2O
3Slag inclusion has reduced the surface quality of foundry goods, has had a strong impact on the lumber recovery and the mechanical property of foundry goods.The lighter reduces the service life of foundry goods, and weight person causes that foundry goods scraps.Therefore, be necessary to select a kind of suitable coverture to come to protect effectively the melt in the crystallizer, reduce its air-breathing and oxidation, thereby improve the quality of foundry goods.
At present both at home and abroad less to the research of the coverture of aluminium bronze, existing mostly be the certain methods that some enterprises explore through practice for a long time in actual production.At present sum up following three kinds for the selection of the coverture of aluminium bronze: (1) carbon black or graphite, utilize lubricating of carbon black or graphite and the covering effect is protected the melt in the crystallizer like suggestions such as Xiao Enkui.(2) ice crystal.(3) salt-mixture recommends to adopt cullet or chemical flux (like 45%Na like american foundrymen's societry
2CO
3+ CaO) prevent the oxidation of aluminium.Overburden cover when coverture uses in few report casting process in the document.Investigate to find through the production scene, more than the thickness of several kinds of covertures when using generally reach 10～20mm.
To the high characteristics of aluminium content in the aluminium bronze, in order to obtain high-quality ingot casting, coverture will be brought into play the effect of two aspects simultaneously.On the one hand to stop melt to contact and produce air-breathing oxidation with atmosphere, on the other hand also will with the block Al that has produced
2O
3Reaction gets into the crystallizer wall gap to avoid it.More than three types coverture defective is separately arranged.Carbon black is added in the effect that can only play secluding air in the crystallizer, and can not be with the block Al of bath surface
2O
3Therefore dissolving always exists a large amount of carbon blacks and block Al
2O
3Be involved in the ingot casting top layer together, form darker Al
2O
3Slag inclusion and pit.Compare with carbon black, with ice crystal or the salt-mixture coverture as casting process, it not only can prevent contacting of melt and air, but also can be with established block Al
2O
3Fusing stops it to flow into internal surface of crystallizer, but the difficult control of the addition of coverture.When adding bigger amount, wherein do not become the gap that impurity is involved in crystallizer and ingot casting easily with the part that melt directly contacts, cause slag inclusion, a spot of coverture can not be brought into play best coverage effect again.
To sum up, develop a kind of coverture and definite its addition that is used for vertical semi-continuous casting of aluminum bronze, make its secluding air effectively, again can be with established block Al
2O
3Fusing can also be played lubrication preferably to crystallizer wall, to actual production the obvious practical meaning will be arranged.
Summary of the invention
The purpose of this invention is to provide a kind of coverture and application thereof that is used for vertical semi-continuous casting of aluminum bronze,, enhance productivity simultaneously, reduce production costs to satisfy the demand of manufacturing industry to the high-quality Al bronze material.
The objective of the invention is to realize in the following manner:
A kind of coverture that is used for vertical semi-continuous casting of aluminum bronze, form by following compositions in weight percentage:
Ice crystal: 40%～70%;
Phosphor bronze alloy: 2～10%;
Surplus is the charcoal ash; Each weight percentages of components sum is 100%.
As further optimization, the shared percentage by weight of each component is in the said coverture:
Ice crystal 50～70%;
Phosphor bronze alloy: 3～8%;
Surplus is the charcoal ash; Each composition weight percent and be 100%.
A kind of application that is used for the coverture of vertical semi-continuous casting of aluminum bronze is among the present invention: when the vertical semi-continuous casting of aluminium bronze, adopt " thin covering " technology, the powdery coverture is sprinkling upon bath surface equably, overburden cover is 0.5～2mm.
As further optimization, described a kind of application that is used for the vertical semi-continuous casting of aluminum bronze coverture is: when the vertical semi-continuous casting of aluminium bronze, and the circular porous mesh screen of fixing one 20～50 purpose on crystallizer, coverture promptly is placed in one; During casting, along with the frequency vibration of crystallizer with 1～3Hz, the powdery coverture in the mesh screen is sprinkling upon bath surface equably, and overburden cover is 0.5～2mm.
A kind of preparation method who is used for the coverture of vertical semi-continuous casting of aluminum bronze is: raw material is prepared by above-mentioned mass percent; Tentatively pulverize earlier, mix through agitator again; The coverture that mixes is put into oven, and drying is 2～3 hours under 200～300 ℃; Further pulverize after the oven dry, sieve, make it to become the powder that diameter is 10～600 μ m; At last it is packed with the waterproof plastic bag.
Design principle of the present invention is: through further investigation and repetition test, select under aluminium bronze technology fusion temperature, can fuse again and do not react with copper, proportion is less than the material of the aluminium bronze melt coverture as bath surface.Under this temperature, it evenly is sprinkled into the aluminium bronze bath surface, protection aluminium bronze melt no longer increases air-breathing and oxidation in casting process.Said material can be with established block Al
2O
3Dissolving, and in the rapid film forming of bath surface, and good fluidity, block Al avoided
2O
3After assembling slagging scorification near the crystallizer inwall, fold into the ingot casting top layer, form and be mingled with and defective such as cold shut.Simultaneously, this material also want can be after flowing into the crystallizer inwall lubricate, improve casting efficient.
A kind of proportion of the coverture that is used for vertical semi-continuous casting of aluminum bronze is less than the aluminium bronze melt among the present invention, and main component is an ice crystal, and it can dissolve Al rapidly
2O
3Film reduces being mingled with and defective such as cold shut of ingot casting top layer, improves lumber recovery; And add trace amounts of phosphorus is in order to improve the flowability of top layer melt, to improve casting quality; The charcoal ash then can reduce the degree of oxidation of top layer melt, and ingot casting is played certain lubrication, effectively enhances productivity and service life of crystallizer.
When this coverture is applied to the vertical semi-continuous casting of aluminium bronze, employing be " thin covering " technology, i.e. the circular porous mesh screen of fixing one 20～50 purpose on crystallizer, coverture promptly is placed in one; During casting, along with the frequency vibration of crystallizer with 1～3Hz, the powdery coverture in the mesh screen is sprinkling upon bath surface equably, and overburden cover is merely 0.5～2mm, can effectively reduce production costs.
The good effect that produces when the main advantage of the coverture that compared with prior art, the present invention relates to and application shows:
When 1, adopting coverture of the present invention to carry out vertical semi-continuous casting of aluminum bronze, ingot casting surface slag inclusion seldom and very shallow, its lumber recovery has improved 10～40%;
When 2, adopting coverture of the present invention to carry out vertical semi-continuous casting of aluminum bronze, production efficiency has improved 15%～35%, and the crystallizer life-span improves 50%～80%;
3, the aluminium brone casting that adopts coverture of the present invention to cast out, mechanical property and forming property are all good.
4, coverture raw material of the present invention be easy to get, cheap, application cost is low, easy to use.
The specific embodiment
By the following examples, technical scheme of the present invention is further specified.
Embodiment 1
A kind of preparation that is used for the coverture of vertical semi-continuous casting of aluminum bronze process
Percetage by weight by ice crystal 60%, charcoal ash 35%, CuP14 phosphor bronze alloy 5% prepares raw material; Earlier it is tentatively pulverized, mix through agitator again; The coverture that mixes is put into oven, and drying is 3 hours under 300 ℃; Further pulverize after the oven dry, sieve, make it to become the powder that diameter is 10～500 μ m; At last it is packed with the waterproof plastic bag.
Embodiment 2
The application of coverture of the present invention in QAl10-4-4 vertical semi-continuous casting process
Coverture of the present invention is applied in the vertical semi-continuous casting process of QAl10-4-4; The mass percent of each component of coverture is respectively ice crystal 40%, charcoal ash 58%, CuP10 phosphor bronze alloy 2%, and the thickness that joins bath surface in the crystallizer is 0.5mm.With conventional coverture (carbon black or salt-mixture; Cladding thickness is greater than 15mm) compare; Adopt coverture of the present invention that defectives such as being mingled with of ingot casting top layer, cold shut are reduced, lumber recovery has improved 21%, and production efficiency has improved 30%; The crystallizer life-span has improved 70%, and the cost of coverture itself reduces more than 50%; The intensity of foundry goods and plasticity have all obtained effective raising, and properties for follow is good.
Embodiment 3
The application of coverture of the present invention in QAl9-2 vertical semi-continuous casting process
Coverture of the present invention is applied in the vertical semi-continuous casting process of QAl9-2; The mass percent of each component of coverture is respectively ice crystal 60%, charcoal ash 35%, CuP14 phosphor bronze alloy 5%, and the thickness that joins bath surface in the crystallizer is 1mm.With conventional coverture (carbon black or salt-mixture; Cladding thickness is greater than 15mm) compare; Adopt coverture of the present invention that defectives such as being mingled with of ingot casting top layer, cold shut are reduced, lumber recovery has improved 35%, and production efficiency has improved 22%; The crystallizer life-span has improved 65%, and the cost of coverture itself reduces more than 45%; The intensity of foundry goods and plasticity have all obtained effective raising, and properties for follow is good.
Embodiment 4
The application of coverture of the present invention in QAl10-3-1.5 vertical semi-continuous casting process
Coverture of the present invention is applied in the vertical semi-continuous casting process of QAl10-3-1.5; The mass percent of each component of coverture is respectively ice crystal 70%, charcoal ash 20%, CuP14 phosphor bronze alloy 10%, and the thickness that joins bath surface in the crystallizer is 2mm.With conventional coverture (carbon black or salt-mixture; Cladding thickness is greater than 15mm) compare; Adopt coverture of the present invention that defectives such as being mingled with of ingot casting top layer, cold shut are reduced, lumber recovery has improved 28%, and production efficiency has improved 15%; The crystallizer life-span has improved 56%, and the cost of coverture itself reduces more than 35%; The intensity of foundry goods and plasticity have all obtained effective raising, and properties for follow is good.
The foregoing description is used for explaining the present invention, rather than limits the invention, and in spirit of the present invention and claim protection domain, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (3)
1. coverture that is used for vertical semi-continuous casting of aluminum bronze, form by following compositions in weight percentage:
Ice crystal: 40%～70%;
Phosphor bronze alloy: 2～10%;
Surplus is the charcoal ash; Each composition weight percent and be 100%.
2. coverture according to claim 1, form by following compositions in weight percentage:
Ice crystal: 50%～70%;
Phosphor bronze alloy: 3～8%;
Surplus is the charcoal ash; Each composition weight percent and be 100%.
3. claim 1 or 2 described a kind of application that are used for the vertical semi-continuous casting of aluminum bronze coverture is characterized in that: when the vertical semi-continuous casting of aluminium bronze, and the circular porous mesh screen of fixing one 20～50 purpose on crystallizer, coverture promptly is placed in one; During casting, along with the frequency vibration of crystallizer with 1～3Hz, the powdery coverture in the mesh screen is sprinkling upon bath surface equably, and overburden cover is 0.5～2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102288104A CN101885044B (en) | 2010-07-16 | 2010-07-16 | Covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102288104A CN101885044B (en) | 2010-07-16 | 2010-07-16 | Covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101885044A CN101885044A (en) | 2010-11-17 |
| CN101885044B true CN101885044B (en) | 2012-01-25 |
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| CN2010102288104A Expired - Fee Related CN101885044B (en) | 2010-07-16 | 2010-07-16 | Covering agent used for vertical semi-continuous casting of aluminum bronze and application thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554148A (en) * | 2010-12-11 | 2012-07-11 | 鞍钢股份有限公司 | Control method for reducing hydrogen increase of cast first-tank molten steel |
| CN103128242A (en) * | 2011-12-01 | 2013-06-05 | 胡遐秋 | Aluminum bronze semicontinuous ingot casting process |
| CN104894411A (en) * | 2015-04-16 | 2015-09-09 | 新疆大学 | Slagging agent used for melting copper alloy and application method thereof |
| CN107552748A (en) * | 2017-08-16 | 2018-01-09 | 徐高杰 | A kind of covering agent for smelting copper alloy and its application method |
| CN110560649B (en) * | 2019-10-12 | 2021-09-24 | 中南大学 | Novel high-aluminum steel casting powder and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU897873A1 (en) * | 1979-01-17 | 1982-01-15 | Научно-исследовательский институт автотракторных материалов | Covering flux for copper-based alloys |
| SU1206242A1 (en) * | 1983-12-27 | 1986-01-23 | Научно-производственное объединение "Камень и силикаты" | Composition for producing foam material |
-
2010
- 2010-07-16 CN CN2010102288104A patent/CN101885044B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU897873A1 (en) * | 1979-01-17 | 1982-01-15 | Научно-исследовательский институт автотракторных материалов | Covering flux for copper-based alloys |
| SU1206242A1 (en) * | 1983-12-27 | 1986-01-23 | Научно-производственное объединение "Камень и силикаты" | Composition for producing foam material |
Non-Patent Citations (1)
| Title |
|---|
| 王云山等.大型铝青铜实体保持架铸件生产的技术要点.《铸造技术》.2010,(第1期), * |
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| CN101885044A (en) | 2010-11-17 |
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Granted publication date: 20120125 Termination date: 20130716 |