CN106623787B - A kind of preparation method of aluminium alloy Melt casting and its binder used - Google Patents
A kind of preparation method of aluminium alloy Melt casting and its binder used Download PDFInfo
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- CN106623787B CN106623787B CN201611239278.XA CN201611239278A CN106623787B CN 106623787 B CN106623787 B CN 106623787B CN 201611239278 A CN201611239278 A CN 201611239278A CN 106623787 B CN106623787 B CN 106623787B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/183—Sols, colloids or hydroxide gels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of preparation method of aluminium alloy Melt casting and its binders used, it is that 2.6-2.9:1 is equipped with and is made that wherein binder, which is silica solution and upper shop powder with mass ratio, and the preparation method of casting mainly includes, plaster core preparation, the bonding of plaster core, then by low-temperature bake, waxdip, casting wax mould, layering is coated with and high-temperature roasting, then after carrying out fusible pattern casting formation aluminium alloy Melt casting.This method is using binder made of upper shop powder and silica solution, and adhesion strength is low after solving the roasting of plaster core formwork, and easily occur slag inclusion and core shift the problem of.
Description
Technical field
The invention belongs to aluminium alloy Melt casting technical fields, are related to a kind of system of aluminium alloy Melt casting
Preparation Method；Further relate to the binder that the above method uses.
Background technique
In aluminium alloy precision-investment casting, when casting type chamber is complicated, can not be produced using conventional shell side method processed, lead to
It is produced frequently with independent coremaking combination model casting.Since gypsum production core strength is high, later period easy depoling and gypsum at
This is low, therefore is the most widely used coremaking material of aluminium alloy precision-investment casting.Since gypsum material own physical is special
Property, gypsum volume expansion in hardening process, so plaster core is not easy depanning, plaster core mold mostly based on loose piece structure,
Structure is complicated.If casting cavity structure is complicated, plaster core mold is unable to complete the production of monolithic devices core, when design, leads to
Type core is often divided into several parts, is then attached by binder appropriate, to form core for cast.
Plaster core is often waterglass with binder, but type core easily foams in later period formwork roasting process, and
White sodium silicate solids, and bonded part intensity is low, easily occurring the problems such as slag inclusion, core shift after casting pouring causes casting to be scrapped.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation method of aluminium alloy Melt casting, this method uses upper shop
Binder made of powder and silica solution, adhesion strength is low after solving the roasting of plaster core formwork, and the slag inclusion that easily occurs and partially
The problem of core.
The object of the invention is also to provide binders used in the above method.
The purpose of the present invention is achieved through the following technical solutions:
The preparation method of this aluminium alloy Melt casting, including
Step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, is formed and needed
The plaster core branch of bonding；
It step 2, is that 2.6-2.9:1 is equipped with obtained binder, and binder is applied with mass ratio by silica solution and upper shop powder
In plaster core, branch is bonded, and is then allowed to stand air-dried, obtains monolithic devices core；
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 150-250 DEG C of environment, obtains the first monolithic devices core；
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 10-30min, obtains waxdip after cooling
Monolithic devices core；
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, and running channel needed for preparing mould group, by the whole of waxdip
Figure core and running channel carry out a group type, obtain the mould group of group type；
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax；
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, obtains formwork；
Step 8, fusible pattern casting is carried out to formwork, forms casting.
Further, the features of the present invention also characterized in that:
It is wherein stood in step 2 and air-dries 1-2h.
The wherein high-temperature roasting in step 7 is 100 DEG C of heat preservation 1h of every heating, after persistently overheating to 730-750 DEG C, is kept the temperature
2h。
The wherein any surface finish of the casting wax mould in step 5.
Extra binder is wherein removed in step 2 after bonding.
The present invention also provides a kind of binders for above-mentioned preparation method, including silica solution and upper shop powder mixing system
At wherein the mass ratio of silica solution and upper shop powder is 2.6-2.9:1, wherein upper shop powder is shop powder in 325 purposes.
The beneficial effects of the present invention are: gypsum mould core model can be improved using the binder that upper shop powder and silica solution are prepared
Adhesion strength is low after block roasting, slag inclusion and the problem of core shift, improves the qualification rate of casting finished products；And the binder manufactures
It is at low cost, it prepares simply, is reducing the production cost of casting preparation, while improving production efficiency and quality.
Specific embodiment
The invention will be described in further detail With reference to embodiment:
The present invention provides a kind of preparation methods of aluminium alloy Melt casting, comprising the following steps:
Step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, is formed and needed
The plaster core branch of bonding, and plaster core branch is repaired.
It step 2, is that 2.6-2.9:1 is equipped with obtained binder, and binder is applied with mass ratio by silica solution and upper shop powder
In plaster core, branch is bonded, and removes extra binder, is then allowed to stand air-dried 1-2h, obtains monolithic devices core.
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 150-250 DEG C of environment, obtains the first monolithic devices core, together
When ensure the first whole whose surfaces flawless, without misrun, impulse- free robustness.
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 10-30min, until the first monolithic devices core without
Bubble generates, and obtains the monolithic devices core of waxdip after cooling.
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, while modifies the surface of casting wax mould, guarantee surface
Quality is bright and clean；The monolithic devices core of waxdip and running channel are carried out a group type, obtain the mould of group type by running channel needed for then preparing mould group
Group, the mold of guarantee group type is without wax stream, no-welding-seam.
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax in dewaxing kettle.
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, detailed process is 100 DEG C of heat preservation 1h of every heating, lasting to rise
Temperature keeps the temperature 2h, obtains formwork later to after 730-750 DEG C.
Step 8, fusible pattern casting is carried out to formwork, forms casting.
The present invention also provides the binder of the preparation method for aluminium alloy Melt casting, including silica solution and
Upper shop powder is mixed, and wherein the mass ratio of silica solution and upper shop powder is 2.6-2.9:1；Wherein upper shop powder is shop in 325 purposes
Powder.
Specific embodiments of the present invention are:
Embodiment 1
Prepare certain h type engine h aluminium alloy castings, detailed process are as follows:
Step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, is formed and needed
The plaster core branch of bonding, and plaster core branch is repaired.
It step 2, is that 2.65:1 is equipped with obtained binder, and binder is coated in mass ratio by silica solution and upper shop powder
Plaster core branch is bonded, and removes extra binder, is then allowed to stand air-dried 1h, obtains monolithic devices core.
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 200 DEG C of environment, obtains the first monolithic devices core, while really
Protect the first whole whose surfaces flawless, without misrun, impulse- free robustness.
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 10min, until the first monolithic devices core is without gas
Bubble generates, and obtains the monolithic devices core of waxdip after cooling.
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, while modifies the surface of casting wax mould, guarantee surface
Quality is bright and clean；The monolithic devices core of waxdip and running channel are carried out a group type, obtain the mould of group type by running channel needed for then preparing mould group
Group, the mold of guarantee group type is without wax stream, no-welding-seam.
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax in dewaxing kettle,
The parameter that dewaxes is 850 DEG C, and dewax 20min.
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, detailed process is 100 DEG C of heat preservation 1h of every heating, lasting to rise
Temperature keeps the temperature 2h, obtains formwork later to after 750 DEG C.
Step 8, fusible pattern casting is carried out to formwork, forms casting.
For casting obtained after x-ray examination, Internal Quality of Cast reaches II like members standard of HB963, hence it is evident that improves casting
The problems such as part slag inclusion inside, core shift.
Embodiment 2
Prepare certain h type engine h aluminium alloy castings, detailed process are as follows:
Step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, is formed and needed
The plaster core branch of bonding, and plaster core branch is repaired.
It step 2, is that 2.70:1 is equipped with obtained binder, and binder is coated in mass ratio by silica solution and upper shop powder
Plaster core branch is bonded, and removes extra binder, is then allowed to stand air-dried 1h, obtains monolithic devices core.
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 200 DEG C of environment, obtains the first monolithic devices core, while really
Protect the first whole whose surfaces flawless, without misrun, impulse- free robustness.
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 20min, until the first monolithic devices core is without gas
Bubble generates, and obtains the monolithic devices core of waxdip after cooling.
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, while modifies the surface of casting wax mould, guarantee surface
Quality is bright and clean；The monolithic devices core of waxdip and running channel are carried out a group type, obtain the mould of group type by running channel needed for then preparing mould group
Group, the mold of guarantee group type is without wax stream, no-welding-seam.
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax in dewaxing kettle,
The parameter that dewaxes is 850 DEG C, and dewax 20min.
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, detailed process is 100 DEG C of heat preservation 1h of every heating, lasting to rise
Temperature keeps the temperature 2h, obtains formwork later to after 730 DEG C.
Step 8, fusible pattern casting is carried out to formwork, forms casting.
For casting obtained after x-ray examination, Internal Quality of Cast reaches II like members standard of HB963, hence it is evident that improves casting
The problems such as part slag inclusion inside, core shift.
Embodiment 3
Prepare certain h type engine h aluminium alloy castings, detailed process are as follows:
Step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, is formed and needed
The plaster core branch of bonding, and plaster core branch is repaired.
It step 2, is that 2.60:1 is equipped with obtained binder, and binder is coated in mass ratio by silica solution and upper shop powder
Plaster core branch is bonded, and removes extra binder, is then allowed to stand air-dried 1h, obtains monolithic devices core.
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 200 DEG C of environment, obtains the first monolithic devices core, while really
Protect the first whole whose surfaces flawless, without misrun, impulse- free robustness.
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 30min, until the first monolithic devices core is without gas
Bubble generates, and obtains the monolithic devices core of waxdip after cooling.
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, while modifies the surface of casting wax mould, guarantee surface
Quality is bright and clean；The monolithic devices core of waxdip and running channel are carried out a group type, obtain the mould of group type by running channel needed for then preparing mould group
Group, the mold of guarantee group type is without wax stream, no-welding-seam.
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax in dewaxing kettle,
The parameter that dewaxes is 850 DEG C, and dewax 20min.
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, detailed process is 100 DEG C of heat preservation 1h of every heating, lasting to rise
Temperature keeps the temperature 2h, obtains formwork later to after 740 DEG C.
Step 8, fusible pattern casting is carried out to formwork, forms casting.
For casting obtained after x-ray examination, Internal Quality of Cast reaches II like members standard of HB963, hence it is evident that improves casting
The problems such as part slag inclusion inside, core shift.
Embodiment 4
Prepare certain h type engine h aluminium alloy castings, detailed process are as follows:
Step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, is formed and needed
The plaster core branch of bonding, and plaster core branch is repaired.
It step 2, is that 2.80:1 is equipped with obtained binder, and binder is coated in mass ratio by silica solution and upper shop powder
Plaster core branch is bonded, and removes extra binder, is then allowed to stand air-dried 1h, obtains monolithic devices core.
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 200 DEG C of environment, obtains the first monolithic devices core, while really
Protect the first whole whose surfaces flawless, without misrun, impulse- free robustness.
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 15min, until the first monolithic devices core is without gas
Bubble generates, and obtains the monolithic devices core of waxdip after cooling.
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, while modifies the surface of casting wax mould, guarantee surface
Quality is bright and clean；The monolithic devices core of waxdip and running channel are carried out a group type, obtain the mould of group type by running channel needed for then preparing mould group
Group, the mold of guarantee group type is without wax stream, no-welding-seam.
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax in dewaxing kettle,
The parameter that dewaxes is 850 DEG C, and dewax 20min.
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, detailed process is 100 DEG C of heat preservation 1h of every heating, lasting to rise
Temperature keeps the temperature 2h, obtains formwork later to after 745 DEG C.
Step 8, fusible pattern casting is carried out to formwork, forms casting.
For casting obtained after x-ray examination, Internal Quality of Cast reaches II like members standard of HB963, hence it is evident that improves casting
The problems such as part slag inclusion inside, core shift.
Embodiment 5
Prepare certain h type engine h aluminium alloy castings, detailed process are as follows:
Step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, is formed and needed
The plaster core branch of bonding, and plaster core branch is repaired.
It step 2, is that 2.90:1 is equipped with obtained binder, and binder is coated in mass ratio by silica solution and upper shop powder
Plaster core branch is bonded, and removes extra binder, is then allowed to stand air-dried 1h, obtains monolithic devices core.
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 200 DEG C of environment, obtains the first monolithic devices core, while really
Protect the first whole whose surfaces flawless, without misrun, impulse- free robustness.
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 25min, until the first monolithic devices core is without gas
Bubble generates, and obtains the monolithic devices core of waxdip after cooling.
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, while modifies the surface of casting wax mould, guarantee surface
Quality is bright and clean；The monolithic devices core of waxdip and running channel are carried out a group type, obtain the mould of group type by running channel needed for then preparing mould group
Group, the mold of guarantee group type is without wax stream, no-welding-seam.
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax in dewaxing kettle,
The parameter that dewaxes is 850 DEG C, and dewax 20min.
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, detailed process is 100 DEG C of heat preservation 1h of every heating, lasting to rise
Temperature keeps the temperature 2h, obtains formwork later to after 750 DEG C.
Step 8, fusible pattern casting is carried out to formwork, forms casting.
For casting obtained after x-ray examination, Internal Quality of Cast reaches II like members standard of HB963, hence it is evident that improves casting
The problems such as part slag inclusion inside, core shift.
Claims (6)
1. a kind of preparation method of aluminium alloy Melt casting, which is characterized in that including
It step 1, the use of land plaster and water quality ratio is that the obtained gypsum of 3:1 proportion is recorded to obtain core mold, formation needs to bond
Plaster core branch；
It step 2, is that 2.6-2.9:1 is equipped with obtained binder, and binder is coated in stone with mass ratio by silica solution and upper shop powder
Paste type core branch is bonded, and is then allowed to stand air-dried, obtains monolithic devices core；
Step 3, monolithic devices core is carried out to low-temperature bake 3h under 150-250 DEG C of environment, obtains the first monolithic devices core；
Step 4, the first monolithic devices core is placed in the paraffin of boiling, waxdip 10-30min, obtains the entirety of waxdip after cooling
Type core；
Step 5, the monolithic devices core of waxdip is pressed into casting wax mould, and running channel needed for preparing mould group, by the monolithic devices of waxdip
Core and running channel carry out a group type, obtain the mould group of group type；
Step 6, layering is carried out to the mould group of group type using slurry and floor sand to be coated with, then dewax；
Step 7, the formwork after dewaxing is subjected to high-temperature roasting, obtains formwork；
Step 8, fusible pattern casting is carried out to formwork, forms casting.
2. the preparation method of aluminium alloy Melt casting according to claim 1, which is characterized in that in the step 2
It stands and air-dries 1-2h.
3. the preparation method of aluminium alloy Melt casting according to claim 1, which is characterized in that in the step 7
High-temperature roasting be 100 DEG C of heat preservation 1h of every heating, after persistently overheating to 730-750 DEG C, heat preservation 2h.
4. the preparation method of aluminium alloy Melt casting according to claim 1 to 3, which is characterized in that institute
State any surface finish of the casting wax mould in step 5.
5. the preparation method of aluminium alloy Melt casting according to claim 1 to 3, which is characterized in that institute
It states and removes extra binder in step 2 after bonding.
6. the preparation method of aluminium alloy Melt casting according to claim 1, which is characterized in that the upper shop powder is
Shop powder in 325 purposes.
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| CN107790633B (en) * | 2017-11-14 | 2020-12-11 | 五河县俊宝钢结构有限公司 | Investment precision casting process for aluminum alloy doors and windows |
| CN110860658B (en) * | 2019-12-03 | 2021-06-25 | 中国船舶重工集团公司第十二研究所 | Preparation method of wax mold gypsum core of cylindrical thin-wall complex component |
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| CN106040990A (en) * | 2016-08-11 | 2016-10-26 | 山东豪迈机械科技股份有限公司 | Manufacturing method and system for gypsum core used for casting of large impeller |
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| CN105665617A (en) * | 2014-11-18 | 2016-06-15 | 中国科学院金属研究所 | Adhesive for ceramic cores, preparation method and application of adhesive |
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Address after: 710021 Fengcheng 7th Road, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee after: Xi'an Supercrystalline Technology Co.,Ltd. Address before: 710021 Fengcheng 7th Road, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee before: XI'AN SUPERCRYSYAL SCI-TECH DEVELOPMENT Co.,Ltd. |
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Address after: 710299 No. 10, East Section of Jinggao North Road, Jingwei New City, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee after: Xi'an Supercrystalline Technology Co.,Ltd. Address before: 710021 Fengcheng 7th Road, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee before: Xi'an Supercrystalline Technology Co.,Ltd. |