CN109351948B - Casting process of copper-iron insert casting - Google Patents
Casting process of copper-iron insert casting Download PDFInfo
- Publication number
- CN109351948B CN109351948B CN201811294996.6A CN201811294996A CN109351948B CN 109351948 B CN109351948 B CN 109351948B CN 201811294996 A CN201811294996 A CN 201811294996A CN 109351948 B CN109351948 B CN 109351948B
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- copper
- iron
- casting
- pouring
- molten iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
-
- 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
Abstract
The invention relates to a casting process of a copper-iron insert casting, wherein the copper-iron insert casting comprises a copper sleeve and an iron piece cast outside the copper sleeve in an insert manner, and the casting process mainly comprises three steps of a molding process, a smelting process and pouring. According to the casting process of the copper-iron insert casting, disclosed by the invention, when molten iron is poured outside the copper bush, the copper bush is not melted by the molten iron, so that the copper bush and the iron piece are perfectly embedded, and the integrity of the copper bush and the whole casting is kept.
Description
Technical Field
The invention relates to a casting process of a copper-iron cast-in casting.
Background
The copper-iron insert casting comprises a copper sleeve and an iron piece insert-cast outside the copper sleeve, wherein when the copper-iron insert casting is cast, the copper sleeve is processed firstly, and then molten iron is poured outside the copper sleeve to form the copper-iron insert casting. However, the liquidus temperature of copper is around 881 ℃, the liquidus temperature of iron is around 1240 ℃, and the liquidus temperature of iron is higher than the liquidus temperature of copper, so if a copper-iron insert casting is cast by a conventional casting method, after molten iron is poured into a sand mold, a copper sleeve is melted by high-temperature molten iron, so that the rejection rate of the casting is high, which is a great difficulty in iron-copper insert casting.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a casting process of a copper-iron insert casting, which can keep the integrity of a copper sleeve and the whole casting when molten iron is poured outside the copper sleeve.
In order to achieve the purpose, the invention adopts the technical scheme that: a casting process of a copper-iron insert casting, wherein the copper-iron insert casting comprises a copper sleeve and an iron piece insert-cast outside the copper sleeve, and the casting process comprises the following steps:
(1) moulding process
① casting with sand mold casting process, coating the surface of the copper sleeve to be contacted with the molding sand, and baking the copper sleeve before and after coating;
② putting the copper sleeve into a sand box, and filling the sand into the copper sleeve;
③ cleaning the contact surface of the copper sleeve and the cavity;
④, drying the cavity and waiting for pouring molten iron;
(2) the smelting process comprises the following steps:
① smelting raw materials, namely adding the raw materials into a furnace to smelt molten iron with qualified components, wherein the molten iron comprises, by mass, 3.0-3.1% of C, 1.7-1.85% of Si, 0.75-0.85% of Mn, less than or equal to 0.05% of P, less than or equal to 0.10% of S, less than or equal to 0.25% of Cu and the balance of Fe, and the temperature of the molten iron is controlled to 1550-;
② primary slagging-off, namely controlling the temperature in the furnace at 1520-1540 ℃, standing the molten iron for slagging-off, then adding a deslagging agent, and further deslagging;
③ spheroidizing and inoculating treatment, namely spheroidizing and inoculating treatment are carried out on the molten iron;
④ secondary slagging-off, adding slag-removing agent into molten iron, stirring, and slagging off;
(3) pouring:
and pouring the sand mold by using molten iron to form a casting, wherein if the casting is performed by one piece, the pouring temperature is 1290 and 1300 ℃, and if two pieces of casting are poured at one time, the first pouring temperature is 1310 ℃ at most.
Preferably, the copper sleeve is coated with the paint 2 times.
Preferably, the copper sheathing is baked using a torch.
Preferably, the drying temperature of the cavity is 70-90 ℃.
Further, the drying time of the cavity is not less than 2 hours.
Preferably, the raw materials comprise the following components in percentage by mass: pig iron: 30%, thick scrap iron: 30 percent of scrap returns: 40 percent.
Preferably, the standing time is 3-5 minutes during the primary slagging-off.
Preferably, the copper bush is provided with a plurality of dovetail grooves on the periphery.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the casting process of the copper-iron insert casting, disclosed by the invention, when molten iron is poured outside the copper bush, the copper bush is not melted by the molten iron, so that the copper bush and the iron piece are perfectly embedded, and the integrity of the copper bush and the whole casting is kept.
Detailed Description
The technical solution of the present invention is further described below with reference to examples:
example 1:
a casting process of a copper-iron insert casting comprises a copper sleeve and an iron piece insert-cast outside the copper sleeve, wherein a plurality of dovetail grooves are formed in the periphery of the copper piece. The casting process of the copper-iron insert casting comprises the following steps:
(1) moulding process
① casting with sand mold casting process, coating lime powder paint on the surface of the copper sleeve to be contacted with the molding sand, and baking the copper sleeve with blowtorch before and after coating lime powder paint, wherein the frequency of coating lime powder is twice, and the molding sand is preferably resin sand.
② putting the copper bush into a sand box, and filling molding sand into the copper bush to ensure the compactness;
③ cleaning the contact surface of the copper sleeve and the cavity;
④, drying the cavity and waiting for pouring molten iron, wherein the drying temperature of the cavity is 70 ℃, and the drying time of the cavity is 2 hours;
(2) the smelting process comprises the following steps:
① smelting raw materials, namely adding raw materials such as pig iron, thick scrap iron, foundry returns and the like into a furnace to smelt molten iron with qualified components, wherein the raw materials comprise, by mass, 30% of the pig iron, 30% of the thick scrap iron and 40% of the foundry returns, the molten iron comprises, by mass, 3.0% of C, 1.7% of Si, 0.75% of Mn, 0.05% of P, 0.1% of S, 0.25% of Cu and the balance of Fe, and the temperature of the molten iron is controlled to 1550 ℃ in the smelting process;
② primary slagging, namely controlling the temperature in the furnace at 1520 ℃, standing the molten iron for 3 minutes to ensure that floating slag floats upwards and is cleaned, and then covering a deslagging agent for further deslagging;
then carrying out spectral analysis on the molten iron, and judging whether the components of the molten iron need to be adjusted or not so as to smelt qualified molten iron;
③ inoculation, the iron material cast in the copper sheath is preferably gray cast iron, so the liquid iron is inoculated, the inoculation in the embodiment adopts stream inoculation, namely, the inoculant flows to the ladle together with the liquid iron in the process of pouring the liquid iron into the ladle;
④ secondary slagging-off, adding small amount of slag-removing agent into molten iron, stirring, and slagging off slag;
(3) pouring:
and hoisting the molten iron with qualified components to a sand box, and pouring the sand mould by using the molten iron to form the copper-iron cast-in casting. If one casting is carried out, the casting temperature is 1290 ℃, and if two castings are cast at a time, the first casting temperature is 1310 ℃. The inspection of the casting shows that the copper sleeve and the iron piece are combined into a whole, the copper sleeve is complete and is not melted, and the whole casting meets the production requirement.
Example 2:
a casting process of a copper-iron insert casting comprises a copper sleeve and an iron piece insert-cast outside the copper sleeve, wherein a plurality of dovetail grooves are formed in the periphery of the copper piece. The casting process of the copper-iron insert casting comprises the following steps:
(1) the molding process comprises the following steps:
① casting with sand mold casting process, coating lime powder paint on the surface of the copper sleeve to be contacted with the molding sand, and baking the copper sleeve with blowtorch before and after coating lime powder paint, wherein the frequency of coating lime powder is twice, and the molding sand is preferably resin sand.
② putting the copper bush into a sand box, and filling molding sand into the copper bush to ensure the compactness;
③ cleaning the contact surface of the copper sleeve and the cavity;
④, drying the cavity and waiting for pouring molten iron, wherein the drying temperature of the cavity is 80 ℃, and the drying time of the cavity is 2.5 hours;
(2) the smelting process comprises the following steps:
① smelting raw materials, namely adding raw materials such as pig iron, thick scrap iron, foundry returns and the like into a furnace to smelt molten iron with qualified components, wherein the raw materials comprise, by mass, 30% of the pig iron, 30% of the thick scrap iron and 40% of the foundry returns, the molten iron comprises, by mass, 3.1% of C, 1.8% of Si, 0.8% of Mn, 0.04% of P, 0.09% of S, 0.24% of Cu and the balance of Fe, and the temperature of the molten iron is controlled to be 1555 ℃ in the smelting process;
② primary slagging, namely controlling the temperature in the furnace at 1530 ℃, standing the molten iron for 4 minutes, floating the scum, cleaning the scum, covering with a deslagging agent, and further deslagging;
then carrying out spectral analysis on the molten iron, and judging whether the components of the molten iron need to be adjusted or not so as to smelt qualified molten iron;
③ spheroidization and inoculation, in which the iron material cast on the outside of the copper bush is preferably gray cast iron, so the molten iron is inoculated, the inoculation in the embodiment adopts a stream inoculation mode, that is, the inoculant flows to the ladle together with the molten iron during the process of pouring the molten iron into the ladle;
④ secondary slagging-off, adding small amount of slag-removing agent into molten iron, stirring, and slagging off slag;
(3) pouring:
and hoisting the molten iron with qualified components to a sand box, and pouring the sand mould by using the molten iron to form the copper-iron cast-in casting. If one casting is carried out, the casting temperature is 1295 ℃, and if two castings are carried out at a time, the initial casting temperature is 1305 ℃. The inspection of the casting shows that the copper sleeve and the iron piece are combined into a whole, the copper sleeve is complete and is not melted, and the whole casting meets the production requirement.
Example 3:
a casting process of a copper-iron insert casting comprises a copper sleeve and an iron piece insert-cast outside the copper sleeve, wherein a plurality of dovetail grooves are formed in the periphery of the copper piece. The casting process of the copper-iron insert casting comprises the following steps:
(1) the molding process comprises the following steps:
① casting with sand mold casting process, coating lime powder paint on the surface of the copper sleeve to be contacted with the molding sand, and baking the copper sleeve with blowtorch before and after coating lime powder paint, wherein the frequency of coating lime powder is twice, and the molding sand is preferably resin sand.
② putting the copper bush into a sand box, and filling molding sand into the copper bush to ensure the compactness;
③ cleaning the contact surface of the copper sleeve and the cavity;
④, drying the cavity and waiting for pouring molten iron, wherein the drying temperature of the cavity is 90 ℃, and the drying time of the cavity is 3 hours;
(2) the smelting process comprises the following steps:
① smelting raw materials, namely adding raw materials such as pig iron, thick scrap iron, foundry returns and the like into a furnace to smelt molten iron with qualified components, wherein the raw materials comprise, by mass, 30% of the pig iron, 30% of the thick scrap iron and 40% of the foundry returns, the molten iron comprises, by mass, 3.1% of C, 1.85% of Si, 0.85% of Mn, 0.03% of P, 0.08% of S, 0.23% of Cu and the balance of Fe, and the temperature of the molten iron is controlled to be 1555 ℃ in the smelting process;
② primary slagging off, wherein the temperature in the furnace is controlled at 1540 ℃, the molten iron is kept stand for 5 minutes, scum is floated up and is removed completely, and then a deslagging agent is covered for further deslagging;
then carrying out spectral analysis on the molten iron, and judging whether the components of the molten iron need to be adjusted or not so as to smelt qualified molten iron;
③ spheroidizing and inoculating, wherein the iron material cast in the copper bush is preferably gray cast iron, so that molten iron is inoculated, the inoculation in the embodiment adopts a stream inoculation mode, namely, an inoculant flows to a ladle along with the molten iron in the process of pouring the molten iron into the ladle;
(3) pouring:
and hoisting the molten iron with qualified components to a sand box, and pouring the sand mould by using the molten iron to form the copper-iron cast-in casting. If one casting is carried out, the casting temperature is 1300 ℃, and if two castings are cast at one time, the first casting temperature is 1300 ℃. The inspection of the casting shows that the copper sleeve and the iron piece are combined into a whole, the copper sleeve is complete and not melted, and the whole complete process meets the production requirements.
Example 4:
a casting process of a copper-iron insert casting comprises a copper sleeve and an iron piece insert-cast outside the copper sleeve, wherein a plurality of dovetail grooves are formed in the periphery of the copper piece. The casting process of the copper-iron insert casting comprises the following steps:
(1) the molding process comprises the following steps:
adopting a traditional modeling process, wherein: the drying temperature of the cavity is 100 ℃, and the drying time of the cavity is 3 hours
(2) The smelting process comprises the following steps:
adopting a traditional smelting process, wherein: the raw materials are adopted, the mass percentage of the types of the raw materials in the range is adopted, and the temperature of molten iron is controlled to be 1555 ℃ in the smelting process; controlling the temperature in the furnace to 1560 ℃ during primary slagging-off, and standing the molten iron for 5 minutes;
(3) pouring:
the pouring temperature is 1300 ℃, and if two castings are poured at one time, the first pouring temperature is 1300 ℃. And molten iron is used for pouring the sand mold, and the casting does not meet the production requirement when part of the copper sleeve is melted by the molten iron in the pouring process.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. The utility model provides a casting process of copper iron insert casting, copper iron insert casting includes that copper sheathing and insert are in the outside ironware of copper sheathing which characterized in that: the casting process comprises the following steps:
(1) moulding process
① casting with sand mold casting process, coating the surface of the copper sleeve to be contacted with the molding sand, and baking the copper sleeve before and after coating;
② putting the copper sleeve into a sand box, and filling the sand into the copper sleeve;
③ cleaning the contact surface of the copper sleeve and the cavity;
④, drying the cavity and waiting for pouring molten iron;
(2) the smelting process comprises the following steps:
① smelting raw materials, namely adding the raw materials into a furnace to smelt molten iron with qualified components, wherein the molten iron comprises, by mass, 3.0-3.1% of C, 1.7-1.85% of Si, 0.75-0.85% of Mn, less than or equal to 0.05% of P, less than or equal to 0.10% of S, less than or equal to 0.25% of Cu and the balance of Fe, and the temperature of the molten iron is controlled to 1550-;
② primary slagging-off, namely controlling the temperature in the furnace at 1520-1540 ℃, standing the molten iron for slagging-off, then adding a deslagging agent, and further deslagging;
③ spheroidizing and inoculating treatment, namely spheroidizing and inoculating treatment are carried out on the molten iron;
④ secondary slagging-off, adding slag-removing agent into molten iron, stirring, and slagging off;
(3) pouring:
and pouring the sand mold by using molten iron to form a casting, wherein the pouring is single-piece pouring or one-time pouring of two castings, the pouring temperature is 1290-1300 ℃ when the single-piece pouring is carried out, and the first pouring temperature is 1310 ℃ at most when the two castings are poured at one time.
2. A casting process of a copper-iron insert casting according to claim 1, characterized in that: the coating is coated on the copper sleeve for 2 times.
3. A casting process of a copper-iron insert casting according to claim 1, characterized in that: and baking the copper sleeve by using a blast burner.
4. A casting process of a copper-iron insert casting according to claim 1, characterized in that: the drying temperature of the cavity is 70-90 ℃.
5. The casting process of a copper-iron insert casting according to claim 4, characterized in that: the drying time of the cavity is not less than 2 hours.
6. A casting process of a copper-iron insert casting according to claim 1, characterized in that: the raw materials comprise the following components in percentage by mass: pig iron: 30%, thick scrap iron: 30 percent of scrap returns: 40 percent.
7. A casting process of a copper-iron insert casting according to claim 1, characterized in that: and when the slag is removed for the first time, the standing time is 3-5 minutes.
8. A casting process of a copper-iron insert casting according to claim 1, characterized in that: and a plurality of dovetail grooves are formed in the periphery of the copper sleeve.
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| CN201811294996.6A CN109351948B (en) | 2018-11-01 | 2018-11-01 | Casting process of copper-iron insert casting |
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| CN201811294996.6A CN109351948B (en) | 2018-11-01 | 2018-11-01 | Casting process of copper-iron insert casting |
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| CN109351948B true CN109351948B (en) | 2020-07-03 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0263675A (en) * | 1988-08-26 | 1990-03-02 | Chobe Taguchi | Method for welding and joining steel and copper alloy |
| US5547450A (en) * | 1992-03-31 | 1996-08-20 | Sumitomo Metal Industries, Ltd. | Hearth roller with suppressed heat crown |
| CN101693292A (en) * | 2009-10-14 | 2010-04-14 | 芜湖市金贸流体科技股份有限公司 | Whole embedding method for sealing valve body |
| JP5086751B2 (en) * | 2007-09-21 | 2012-11-28 | 株式会社神戸製鋼所 | Aluminum alloy composite and heat exchanger |
| JP5177632B2 (en) * | 2007-11-09 | 2013-04-03 | 日立金属株式会社 | Cylinder for molding machine |
| CN104785758A (en) * | 2015-04-27 | 2015-07-22 | 海安铸鑫金属制品有限公司 | Preparation method for aluminum bronze composite casting valve plate |
| CN107779649A (en) * | 2016-08-29 | 2018-03-09 | 青岛天地铸造有限公司 | A kind of preparation method of aluminium bronze composite casting valve plate |
-
2018
- 2018-11-01 CN CN201811294996.6A patent/CN109351948B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0263675A (en) * | 1988-08-26 | 1990-03-02 | Chobe Taguchi | Method for welding and joining steel and copper alloy |
| US5547450A (en) * | 1992-03-31 | 1996-08-20 | Sumitomo Metal Industries, Ltd. | Hearth roller with suppressed heat crown |
| JP5086751B2 (en) * | 2007-09-21 | 2012-11-28 | 株式会社神戸製鋼所 | Aluminum alloy composite and heat exchanger |
| JP5177632B2 (en) * | 2007-11-09 | 2013-04-03 | 日立金属株式会社 | Cylinder for molding machine |
| CN101693292A (en) * | 2009-10-14 | 2010-04-14 | 芜湖市金贸流体科技股份有限公司 | Whole embedding method for sealing valve body |
| CN104785758A (en) * | 2015-04-27 | 2015-07-22 | 海安铸鑫金属制品有限公司 | Preparation method for aluminum bronze composite casting valve plate |
| CN107779649A (en) * | 2016-08-29 | 2018-03-09 | 青岛天地铸造有限公司 | A kind of preparation method of aluminium bronze composite casting valve plate |
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| CN109351948A (en) | 2019-02-19 |
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