CN110640085A - Investment casting process for hollow casting - Google Patents
Investment casting process for hollow casting Download PDFInfo
- Publication number
- CN110640085A CN110640085A CN201911038672.0A CN201911038672A CN110640085A CN 110640085 A CN110640085 A CN 110640085A CN 201911038672 A CN201911038672 A CN 201911038672A CN 110640085 A CN110640085 A CN 110640085A
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- China
- Prior art keywords
- core rod
- casting
- casting process
- hollow
- investment casting
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a hollow casting investment casting process which comprises the following steps: the method comprises the steps of preparing a wax mold according to the shape of a pattern in a design drawing provided by a user, preparing a core rod according to the shape of a pattern inner cavity in the design drawing provided by the user, sequentially coating a reinforcing material, a transition material and a protective material on the surface of the core rod from inside to outside, inserting the core rod into the wax mold to form a module, spraying refractory sand on the surface of the module, roasting the module to obtain a shell, pouring and smelting an alloy material in a liquid state into the shell, and obtaining a hollow casting after the alloy material is solidified, wherein the reinforcing material is corundum sand. By adopting the technical scheme of the invention, the surface of the core rod is completely wrapped by fine-grained sand, so that the core rod does not have overlarge temperature difference in local areas in each process of the investment casting process, the core rod can be effectively prevented from being broken, and a foundation is laid for improving the forming quality of finished castings.
Description
Technical Field
The invention relates to the technical field of casting processes, in particular to a hollow casting investment casting process.
Background
The investment precision casting is widely applied in the aerospace field, a corresponding wax mould is firstly prepared according to the shape and the characteristics of a casting to be cast in the investment casting process, the liquid alloy material is conveniently poured and smelted in the later period, a plurality of pouring channels are generally required to be adhered to the surface of the wax mould, all the pouring channels are adhered together through dead heads to form a module, then refractory sand is sprayed on the surface of the module, the module is roasted at high temperature to completely melt the wax contained in the module, at the moment, a shell is prepared, and finally the liquid alloy material is poured and smelted in the shell, so that the casting is prepared. With the development of the technology, people have more and more requirements on the functions of casting products, and correspondingly higher requirements on the shapes and structures of the casting products are provided, wherein a hollow casting product is an extremely important casting product.
Disclosure of Invention
In order to solve the technical problem, the invention provides a hollow casting investment casting process.
The invention is realized by the following technical scheme.
The invention provides a hollow casting investment casting process, which comprises the following steps:
the method comprises the steps of preparing a wax mold according to the shape of a pattern in a design drawing provided by a user, preparing a core rod according to the shape of a pattern inner cavity in the design drawing provided by the user, sequentially coating a reinforcing material, a transition material and a protective material on the surface of the core rod from inside to outside, inserting the core rod into the wax mold to form a module, spraying refractory sand on the surface of the module, roasting the module to obtain a shell, pouring and smelting an alloy material in a liquid state into the shell, and obtaining a hollow casting after the alloy material is solidified, wherein the reinforcing material is corundum sand.
The transition material is corundum sand.
The protective material has a particle size smaller than that of the reinforcing material or the transition material.
The core rod is made of ceramic.
The investment casting process of the hollow casting further comprises the following steps:
in the process of sequentially coating the reinforcing material, the transition material and the protective material on the surface of the core rod from inside to outside, the reinforcing material, the transition material or the protective material are firmly bonded by using the ethyl silicate hydrolysate binder.
The investment casting process of the hollow casting further comprises the following steps:
after sequentially coating a reinforcing material, a transition material and a protective material on the surface of the core rod from inside to outside, drying the core rod, and then carrying out the next step.
The alloy material is titanium alloy.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the surface of the core rod is sequentially coated with the reinforcing material, the transition material and the protective material from inside to outside, wherein the reinforcing material and the transition material are all corundum sand, and the reinforcing material, the transition material and the protective material are all fine-grain sand, so that the core rod can be completely wrapped, larger gaps can not be formed on the surface of the core rod, corresponding heat can be uniformly transferred into the core rod when the processes of dewaxing, high-temperature roasting and alloy liquid pouring are carried out, the phenomenon that the temperature difference in the core rod or a local area on the surface of the core rod is too large, the phenomena of fracture or crack and the like are prevented, the shape and size precision of an internal cavity after a finished product casting is formed is ensured, and a foundation is laid for improving the forming quality of the finished product casting.
Drawings
FIG. 1 is a schematic view of the mandrel construction of the present invention.
In the figure: 1-core rod, 2-reinforcing material, 3-transition material and 4-protective material.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in FIG. 1, the invention provides an investment casting process for a hollow casting, which comprises the following steps:
the method comprises the steps of preparing a wax mold according to the shape of a pattern in a design drawing provided by a user, preparing a core rod 1 according to the shape of a pattern inner cavity in the design drawing provided by the user, sequentially coating a reinforcing material 2, a transition material 3 and a protective material 4 on the surface of the core rod 1 from inside to outside, inserting the core rod 1 into the wax mold to form a module, spraying refractory sand on the surface of the module, roasting the module to obtain a shell, pouring and smelting an alloy material in a liquid state into the shell, and obtaining a hollow casting after the alloy material is solidified, wherein the reinforcing material 2 is corundum sand.
Further, it is preferable that the transition material 3 is corundum sand. In addition, the particle size of the shielding material 4 is smaller than that of the reinforcing material 2 or the transition material 3. The material of the mandrel bar 1 is preferably ceramic. The core rod can be completely wrapped by the reinforcing material, the transition material and the protective material by adopting the fine-grained sand, so that a larger gap can not be formed on the surface of the core rod, when the processes of dewaxing, high-temperature roasting and alloy liquid pouring are carried out, corresponding heat can be uniformly transferred into the core rod, the phenomenon that the temperature difference inside the core rod or in a local area on the surface of the core rod is overlarge is avoided, the phenomena of fracture or crack and the like are prevented, the shape and size precision of an internal cavity after a finished product casting is formed are ensured, and a foundation is laid for improving the forming quality of the finished product casting.
In addition, the investment casting process of the hollow casting further comprises the following steps:
in the process of sequentially coating the reinforcing material 2, the transition material 3 and the protective material 4 on the surface of the core rod 1 from inside to outside, the reinforcing material 2, the transition material 3 or the protective material 4 are firmly bonded by using the ethyl silicate hydrolysate binder.
In addition, the investment casting process of the hollow casting further comprises the following steps:
after the surface of the core rod 1 is sequentially coated with the reinforcing material 2, the transition material 3 and the protective material 4 from inside to outside, the core rod 1 is dried, and then the next step is carried out.
Further, it is preferable that the alloy material is a titanium alloy.
By adopting the technical scheme of the invention, the surface of the core rod is sequentially coated with the reinforcing material, the transition material and the protective material from inside to outside, wherein the reinforcing material and the transition material are all corundum sand, and the reinforcing material, the transition material and the protective material are all fine-grain sand, so that the core rod can be completely wrapped, larger gaps can not be formed on the surface of the core rod, corresponding heat can be uniformly transferred into the core rod in the processes of dewaxing, high-temperature roasting and alloy liquid pouring, the phenomenon that the temperature difference in the core rod or a local area on the surface of the core rod is too large, the phenomena of fracture or crack and the like can be prevented, the shape and size precision of an internal cavity after a finished product casting is formed can be ensured, and a foundation is laid for improving the forming quality of the finished product casting.
Claims (7)
1. The investment casting process of the hollow casting is characterized in that: the method comprises the following steps:
the method comprises the steps of preparing a wax mold according to the shape of a pattern in a design drawing provided by a user, preparing a core rod (1) according to the shape of a pattern inner cavity in the design drawing provided by the user, sequentially coating a reinforcing material (2), a transition material (3) and a protective material (4) on the surface of the core rod (1) from inside to outside, inserting the core rod (1) into the wax mold to form a module, spraying refractory sand on the surface of the module, roasting the module to obtain a shell, pouring and smelting an alloy material in a liquid state into the shell, and obtaining a hollow casting after the alloy material is solidified, wherein the reinforcing material (2) is corundum.
2. The hollow casting investment casting process of claim 1, wherein: the transition material (3) is corundum sand.
3. The hollow casting investment casting process of claim 1, wherein: the particle size of the protective material (4) is smaller than that of the reinforcing material (2) or the transition material (3).
4. The hollow casting investment casting process of claim 1, wherein: the core rod (1) is made of ceramic.
5. The hollow casting investment casting process of claim 1, wherein: the investment casting process of the hollow casting further comprises the following steps:
in the process of sequentially coating the reinforcing material (2), the transition material (3) and the protective material (4) on the surface of the core rod (1) from inside to outside, the reinforcing material (2), the transition material (3) or the protective material (4) are firmly bonded by using the ethyl silicate hydrolysate binder.
6. The hollow casting investment casting process of claim 1, wherein: the investment casting process of the hollow casting further comprises the following steps:
after sequentially coating a reinforcing material (2), a transition material (3) and a protective material (4) on the surface of the core rod (1) from inside to outside, drying the core rod (1), and then performing the next step.
7. The hollow casting investment casting process of claim 1, wherein: the alloy material is titanium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911038672.0A CN110640085A (en) | 2019-10-29 | 2019-10-29 | Investment casting process for hollow casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911038672.0A CN110640085A (en) | 2019-10-29 | 2019-10-29 | Investment casting process for hollow casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110640085A true CN110640085A (en) | 2020-01-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911038672.0A Pending CN110640085A (en) | 2019-10-29 | 2019-10-29 | Investment casting process for hollow casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110640085A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421122A (en) * | 2020-05-15 | 2020-07-17 | 贵州安吉航空精密铸造有限责任公司 | Method for manufacturing metal thin-shell part with cavity enclosed at periphery |
| CN111992669A (en) * | 2020-08-19 | 2020-11-27 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method for casting with long and narrow cavity inside |
| CN113695517A (en) * | 2021-08-25 | 2021-11-26 | 贵州安吉航空精密铸造有限责任公司 | Preparation method of shell of titanium alloy investment casting with long and narrow through hole |
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| CN202207774U (en) * | 2011-08-31 | 2012-05-02 | 贵州安吉航空精密铸造有限责任公司 | Investment shell for casting castings with slender holes |
| CN203245333U (en) * | 2013-04-23 | 2013-10-23 | 重庆双腾机械制造有限公司 | Curve type oil passage hole gear casing evanescent model |
| CN104493091A (en) * | 2014-12-15 | 2015-04-08 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method of aluminum alloy pores |
| CN106583652A (en) * | 2017-01-16 | 2017-04-26 | 宁国市华成金研科技有限公司 | Investment casting method |
| CN107520406A (en) * | 2017-09-12 | 2017-12-29 | 东方电气集团东方汽轮机有限公司 | A kind of long tube shape component casting method |
| CN107790644A (en) * | 2017-11-09 | 2018-03-13 | 东方电气集团东方汽轮机有限公司 | A kind of method for preventing Hollow Blade Wax patterns from deforming |
| CN107999706A (en) * | 2017-12-18 | 2018-05-08 | 贵州安吉航空精密铸造有限责任公司 | The casting method of cavity casting is set in a kind of |
| CN110180994A (en) * | 2019-06-24 | 2019-08-30 | 中国航发动力股份有限公司 | A kind of preparation method of the elongated blind hole investment-casting shell of band |
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2019
- 2019-10-29 CN CN201911038672.0A patent/CN110640085A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202207774U (en) * | 2011-08-31 | 2012-05-02 | 贵州安吉航空精密铸造有限责任公司 | Investment shell for casting castings with slender holes |
| CN203245333U (en) * | 2013-04-23 | 2013-10-23 | 重庆双腾机械制造有限公司 | Curve type oil passage hole gear casing evanescent model |
| CN104493091A (en) * | 2014-12-15 | 2015-04-08 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method of aluminum alloy pores |
| CN106583652A (en) * | 2017-01-16 | 2017-04-26 | 宁国市华成金研科技有限公司 | Investment casting method |
| CN107520406A (en) * | 2017-09-12 | 2017-12-29 | 东方电气集团东方汽轮机有限公司 | A kind of long tube shape component casting method |
| CN107790644A (en) * | 2017-11-09 | 2018-03-13 | 东方电气集团东方汽轮机有限公司 | A kind of method for preventing Hollow Blade Wax patterns from deforming |
| CN107999706A (en) * | 2017-12-18 | 2018-05-08 | 贵州安吉航空精密铸造有限责任公司 | The casting method of cavity casting is set in a kind of |
| CN110180994A (en) * | 2019-06-24 | 2019-08-30 | 中国航发动力股份有限公司 | A kind of preparation method of the elongated blind hole investment-casting shell of band |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421122A (en) * | 2020-05-15 | 2020-07-17 | 贵州安吉航空精密铸造有限责任公司 | Method for manufacturing metal thin-shell part with cavity enclosed at periphery |
| CN111992669A (en) * | 2020-08-19 | 2020-11-27 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method for casting with long and narrow cavity inside |
| CN113695517A (en) * | 2021-08-25 | 2021-11-26 | 贵州安吉航空精密铸造有限责任公司 | Preparation method of shell of titanium alloy investment casting with long and narrow through hole |
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Application publication date: 20200103 |