CN100457322C - Method for improving ingot surface quality - Google Patents
Method for improving ingot surface quality Download PDFInfo
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- CN100457322C CN100457322C CNB2007100659729A CN200710065972A CN100457322C CN 100457322 C CN100457322 C CN 100457322C CN B2007100659729 A CNB2007100659729 A CN B2007100659729A CN 200710065972 A CN200710065972 A CN 200710065972A CN 100457322 C CN100457322 C CN 100457322C
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- mold
- alumina powder
- ingot
- surface quality
- ingot surface
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Abstract
The invention is concerned with a method to enhance the quality of surface of ingot. When melting the alloy with intermediate frequency induction under the condition of vacuum, mix the alumina powder with water and print on the surface of mold with brush. The mold is black lead mold or steel mold after heating, firing and drying and uses in vacuum furnace with 10 to 30 mm thickness, the granularity of alumina powder is 300 to 500 mesh, and the concentration of mixture liquid if 30 to 40 percent. The granularity of the demand alumina powder or zirconia powder is larger than 300 mesh and during the using, add 20 to 40 percent of alumina powder to the water. It uses the characteristic of alumina powder or zirconia powder with low heat conductivity and prints one layer of alumina powder or zirconia powder on the inner surface of black lead mold or steel mold to reduce the heat conductivity of mold and the cooling speed of metal melting. The cold lap of this surface to ingot is dissolve or little than the one of surface to ingot made by metal mould or black lead mould.
Description
Technical field
The present invention relates to the metal material preparation field, particularly relate to the metal alloy compositions ingot surface quality and improve problem.
Background technology
Ingot surface quality is one of key factor of estimating ingot quality, and it will have a direct impact the processing in ingot casting later stage.Bad surperficial ingot casting need carry out surperficial turning usually before processing, remove blemish.Especially will improve the surface quality of ingot casting when the precious metal ingot casting that casting approaches ingot casting and casts less, good surperficial ingot quality can improve working (machining) efficiency, reduces metal loss, reduces cost.The factor that influences ingot surface quality is a lot, as casting rate, cast temperature, and mold temperature, mold rate of heat transfer etc.
Graphite and metal are the diecasting materials of using always, are characterized in and can use repeatedly.But the thermal conductivity of graphite and metal is bigger, and the metal bath of high temperature pours into mold, is easy to produce cold shut on the ingot casting surface in process of setting.
Mold can be divided into metal pattern, water-cooled metal mould, Sha Mo, graphite mo(u)ld etc. according to the material difference.Heat transfer rate descends successively by water-cooled metal mould, metal pattern, graphite mo(u)ld, Sha Mo in these molds.Rate of heat transfer is fast more then in defectives such as the surperficial cold shuts of easy more formation of when casting.Husky mould generally all is disposable mold, can not reuse.
Summary of the invention
The method that the present invention improves ingot surface quality is: in a vacuum, during the Medium frequency induction molten alloy, the alumina powder water is mixed into suspension, dips in to get with hairbrush and be painted on mould surface, mold is put into vacuum drying oven through the heated baking drying and is used.Mold thickness 10～30mm.The alumina powder granularity is 300 orders～500 orders.Mold is graphite casting die or steel mold.The concentration of described suspension is 30%～40%.
Aluminium oxide or zirconia powder granularity＞300 orders that the present invention requires add 20～40% alumina powder in water during use, the back that stirs is dipped in to get with hairbrush and brushed in the mold inner surface, just can use behind the heating, drying.
The present invention utilizes aluminium oxide or the lower characteristic of zirconia thermal conductivity, is coated with one deck aluminium oxide or Zirconium oxide powder at graphite or metal mold inner surface, thereby has reduced the thermal conductivity of mold, has also reduced the cooldown rate of metal bath.Ingot surface quality with the casting of this mold is compared with direct ingot casting surface with metal pattern, graphite mo(u)ld casting, ingot casting surface cold shut disappearance or seldom.
The specific embodiment
Embodiment 1: 2 * 10
-1In the Pa vacuum, Medium frequency induction melting CuMnNiCo alloy.Mold is the graphite casting die of surface-coated alumina powder, and alumina powder (350 order) water is mixed into 30% suspension, dips in to get with hairbrush to be painted on the graphite casting die surface, and mold is put into vacuum drying oven through the heated baking drying and used.Mold thickness 10mm, die cavity 200 * 70 * 10 (mm).The alloy cast ingot no cold shut in surface and other defective of casting in this way.
Embodiment 2: 2 * 10
-1In the Pa vacuum, Medium frequency induction melting AgCu alloy.Mold is the graphite casting die of surface-coated alumina powder, and alumina powder (350 order) water is mixed into 40% suspension, dips in to get with hairbrush to be painted on the graphite casting die surface, and mold is put into vacuum drying oven through the heated baking drying and used.Mold thickness 30mm, die cavity 200 * 70 * 30 (mm
3).The alloy cast ingot no cold shut in surface and other defective of casting in this way.
Embodiment 3: 2 * 10
-1In the Pa vacuum, Medium frequency induction melting AgCu alloy.Mold is the steel mold of surface-coated alumina powder, and alumina powder (500 order) water is mixed into 35% suspension, dips in to get with hairbrush to be painted on the graphite casting die surface, and mold is put into vacuum drying oven through the heated baking drying and used.Mold thickness 20mm, die cavity 100 * 60 * 20 (mm).The alloy cast ingot no cold shut in surface and other defective of casting in this way.
Claims (5)
1, a kind of method that improves ingot surface quality, it is characterized in that: in a vacuum, during the Medium frequency induction molten alloy, the alumina powder water is mixed into suspension, dip in to get with hairbrush and be painted on mould surface, mold is put into vacuum drying oven through the heated baking drying and is used.
2. the method for raising ingot surface quality according to claim 1 is characterized in that: described mold thickness 10～30mm.
3. the method for raising ingot surface quality according to claim 1 is characterized in that: described alumina powder granularity is 300 orders～500 orders.
4, the method for raising ingot surface quality according to claim 1 is characterized in that: described mold is graphite casting die or steel mold.
5, the method for raising ingot surface quality according to claim 1 is characterized in that: the concentration of described suspension is 30%～40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100659729A CN100457322C (en) | 2007-06-19 | 2007-06-19 | Method for improving ingot surface quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100659729A CN100457322C (en) | 2007-06-19 | 2007-06-19 | Method for improving ingot surface quality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101073820A CN101073820A (en) | 2007-11-21 |
| CN100457322C true CN100457322C (en) | 2009-02-04 |
Family
ID=38975178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100659729A Expired - Fee Related CN100457322C (en) | 2007-06-19 | 2007-06-19 | Method for improving ingot surface quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100457322C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5060458B2 (en) * | 2008-12-05 | 2012-10-31 | トヨタ自動車株式会社 | Die-cast mold and die-cast method |
| CN105522100A (en) * | 2015-12-15 | 2016-04-27 | 常熟市虹桥铸钢有限公司 | High-precision casting die |
| CN109518276B (en) * | 2018-11-02 | 2020-08-07 | 山东天岳先进材料科技有限公司 | Preparation method and device of high-quality silicon carbide crystal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4167418A (en) * | 1977-09-26 | 1979-09-11 | Svirsky Lazar D | Protective coating for metal ingot molds and cores |
| CN1115700A (en) * | 1995-07-09 | 1996-01-31 | 江苏省邳州市官湖机械厂 | Manufacture of pump body and vane of sand-sucking pump |
| CN1121328A (en) * | 1993-04-22 | 1996-04-24 | 福塞科国际有限公司 | A mould and a method for the casting of metals and refractory compositions for use therein |
| CN1191782A (en) * | 1996-11-06 | 1998-09-02 | 于西纳公司 | Protective coating for refractory material members of ingot mould for continuous casting of metals, and refractory material member protected with aid of this coating |
| JP2003126940A (en) * | 2001-10-19 | 2003-05-08 | Tsuchiyoshi Acty Corp | Casting mold and manufacturing method therefor |
-
2007
- 2007-06-19 CN CNB2007100659729A patent/CN100457322C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4167418A (en) * | 1977-09-26 | 1979-09-11 | Svirsky Lazar D | Protective coating for metal ingot molds and cores |
| CN1121328A (en) * | 1993-04-22 | 1996-04-24 | 福塞科国际有限公司 | A mould and a method for the casting of metals and refractory compositions for use therein |
| CN1115700A (en) * | 1995-07-09 | 1996-01-31 | 江苏省邳州市官湖机械厂 | Manufacture of pump body and vane of sand-sucking pump |
| CN1191782A (en) * | 1996-11-06 | 1998-09-02 | 于西纳公司 | Protective coating for refractory material members of ingot mould for continuous casting of metals, and refractory material member protected with aid of this coating |
| JP2003126940A (en) * | 2001-10-19 | 2003-05-08 | Tsuchiyoshi Acty Corp | Casting mold and manufacturing method therefor |
Non-Patent Citations (2)
| Title |
|---|
| 三氧化二铝涂料在合金钢铸件上的应用. 张炳勤.兵器材料科学与工程，第6期. 1983 |
| 三氧化二铝涂料在合金钢铸件上的应用. 张炳勤.兵器材料科学与工程，第6期. 1983 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101073820A (en) | 2007-11-21 |
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