CN103521715A - Preparation method of precise titanium and titanium alloy castings with inner long and thin cavities - Google Patents
Preparation method of precise titanium and titanium alloy castings with inner long and thin cavities Download PDFInfo
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- CN103521715A CN103521715A CN201310404404.2A CN201310404404A CN103521715A CN 103521715 A CN103521715 A CN 103521715A CN 201310404404 A CN201310404404 A CN 201310404404A CN 103521715 A CN103521715 A CN 103521715A
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Abstract
The invention relates to a preparation method of precise titanium and titanium alloy castings with inner long and thin cavities, wherein the castings are used in the fields of aviation and aerospace. The method comprises the steps: preparing a wax mould with a built-in metal mold core; preparing a mold shell with a built-in metal mold core; melting and casting. The titanium and titanium alloy castings prepared by using the method can be favorably fused with the built-in metal mold cores, so that the problem that the titanium and titanium alloy castings with the inner long and thin cavities, particularly thin-wall precise castings, are difficult to mold can be effectively solved.
Description
Technical field
The preparation method who the present invention relates to a kind of titanium or titanium alloy precision casting containing elongated lumens, this foundry goods is for aerospace field.
Background technology
Titanium or titanium alloy investment casting is produced has the foundry goods of elongated lumens mainly by using prefabricated ceramic core or metallic core to be shaped, and after foundry goods is cast, manages to remove.For ceramic core, when inner chamber is long or it is special-shaped be, internal diameter is when more tiny, there is the problems such as depoling difficulty, foundry goods inwall fineness are low.For metallic core, due to the chemism of titanium or titanium alloy, often adopt refractory metal to manufacture core, but exist core without deformability, be difficult to cleaning, cost high, apply the problems such as restricted.Also there is the low-melting-point metal of employing to manufacture core, as the Chinese invention patent application of publication number CN101745602A discloses a kind of preparation method of casting titanium alloy smelting mold meltable metal mold core, this metallic core material is selected solid aluminum, magnesium, zinc and alloy thereof, and at metallic core surface spraying rare earth oxide.Adopt the metallic core in this patent to produce the titanium alloy casting that has elongated lumens, metallic core surface sprays easily forms pollution layer at foundry goods inner surface, and the subtractive process of metallic core can increase production cost.And the Chinese invention patent application that publication number is CN102806311A discloses the complicated pipeline forming technique of a kind of titanium alloy investment-casting, this metallic core adopt pure titanium or with the material of foundry goods with the trade mark, its Baking temperature is 980 ℃～1020 ℃, be incubated 4～4.5 hours, the metallic core problem of oxidation causing in order to alleviate long-time high-temperature roasting, the graphite powder of filling high-temperature vacuum degasification in metallic core.Adopt the titanium alloy casting that has elongated lumens of this explained hereafter, metallic core is due to the above high-temperature roasting microstructure coarsening of process β phase transition temperature, reduce foundry goods overall performance, the graphite powder of inner filling needs specially treated before use simultaneously, increase production cost, and can cause core cavity to pollute.Along with the startup of China's development large aircraft project and various new work engine research and development program elements, body and the structure of titanium alloy casting become increasingly complex, to there being the quality and performance of the titanium or titanium alloy foundry goods of elongated lumens to propose higher requirement.
Summary of the invention
The object of the invention is based on the demand, propose a kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens.Technical solution of the present invention is that the method comprises wax-pattern preparation, the Shell Preparation containing built-in metal core, the melting casting containing built-in metal core;
(1) containing the wax-pattern preparation of built-in metal core, comprise the following steps:
Step 1: according to core cavity shape and dimensioned metallic core, and metallic core is sealed at both ends;
Step 2: metallic core is put into and pressed wax-pattern tool to press wax, obtain the wax-pattern containing built-in metal core;
(2) containing the Shell Preparation of built-in metal core, comprise the following steps:
Step 1: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out to electrical heating dewaxing, dewaxing temperature 100-300 ℃, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out to high-temperature roasting, sintering temperature 700-950 ℃, temperature retention time is 3-5h, obtains the shell containing built-in metal core for casting;
(3) melting casting, utilizes the shell containing built-in metal core under vacuum, to carry out centrifugal casting or gravity-assist pouring.
Described metallic core is titanium or the titanium alloy tubulose structure with thickness, and material and casting material are identical or different, and metallic core internal diameter is identical with the internal diameter of core cavity.
The centrifugal rotational speed of described centrifugal casting is 150-400r/min.
The advantage that the present invention has and beneficial effect, the preparation of the wax-pattern containing built-in metal core that the present invention mainly comprises, built-in tubular metallic insert can play the effect that forms elongate cavity in foundry goods, in core, without filling, can effectively improve the surface smoothness of core cavity.Then utilize wax-pattern to carry out Shell Preparation, and carry out Baking below lower than titanium alloy beta phase transition temperature, to avoid the oxidation of built-in metal whose surfaces and microscopic structure alligatoring.Finally utilize pouring technology, metallic core and molten metal are fused together, and then form elongate cavity in foundry goods.
The specific embodiment
The invention provides a kind of titanium or titanium alloy hot investment casting has the method for elongated lumens foundry goods, and the method comprises wax-pattern preparation, the Shell Preparation containing built-in metal core, the melting casting containing built-in metal core;
(1) containing the wax-pattern of built-in metal core, prepare
This technique is comprised of following steps:
Step 1: according to core cavity shape and dimensioned metallic core, and metallic core is sealed at both ends;
Described metallic core is titanium or the titanium alloy tubulose structure with thickness, material can be identical from casting material also can be different, metallic core internal diameter is identical with the internal diameter of core cavity;
Step 2: metallic core is put into and pressed wax-pattern tool to press wax, obtain the wax-pattern containing built-in metal core;
(2) contain the Shell Preparation of built-in metal core
This technique is comprised of following steps:
Step 1: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out to electrical heating dewaxing, dewaxing temperature 100-300 ℃, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out to high-temperature roasting, sintering temperature 700-950 ℃, temperature retention time is 3-5h, obtains the shell containing built-in metal core for casting;
3) melting casting
Utilize the shell containing built-in metal core under vacuum, to carry out centrifugal casting or gravity-assist pouring.Centrifugal rotational speed is 150-400r/min.In the time of in titanium liquid pours into containing the shell of built-in metal core, the feature of utilizing molten metal high temperature is softening by metallic core surface, and at metallic core rapid shaping around.
Embodiment mono-
The present invention is to provide the preparation method that there is the titanium alloy precision casting of L shaped elongated lumens a kind of inside, it is characterized in that: the method comprises containing the wax-pattern preparation of built-in metal core, the Shell Preparation that contains built-in metal core and melting casting;
The described preparation of the wax-pattern containing built-in metal core, it is comprised of following steps:
Step 1: according to the L shaped elongated lumens dimensioned of foundry goods metallic core, and metallic core is sealed at both ends, described metallic core is the pure titanium pipe of TA2, internal diameter is 8mm;
Step 2: L shaped metallic core is put into and pressed wax-pattern tool to press wax, obtain the wax-pattern containing built-in metal core;
The described Shell Preparation containing built-in metal core, it is comprised of following steps:
Step 1: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out to electrical heating dewaxing, dewaxing temperature 100-300 ℃, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out to high-temperature roasting, sintering temperature 700-950 ℃, temperature retention time is 3-5h, obtains the shell containing built-in metal core for casting;
Described melting casting, is characterized in that shell to carry out under vacuum gravity-assist pouring.
Embodiment bis-
The present invention is to provide the preparation method that there is the titanium alloy precision casting of T shape elongated lumens a kind of inside, it is characterized in that: the method comprises containing the wax-pattern preparation of built-in metal core, the Shell Preparation that contains built-in metal core and melting casting;
The described preparation of the wax-pattern containing built-in metal core, it is comprised of following steps:
Step 1: according to foundry goods T shape elongated lumens dimensioned metallic core, and metallic core is sealed at both ends, described metallic core is the pure titanium pipe of TA1, internal diameter is 6mm;
Step 2: T shape metallic core is put into and pressed wax-pattern tool to press wax, obtain the wax-pattern containing built-in metal core;
The described Shell Preparation containing built-in metal core, it is comprised of following steps:
Step 1: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out to electrical heating dewaxing, dewaxing temperature 100-300 ℃, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out to high-temperature roasting, sintering temperature 700-950 ℃, temperature retention time is 3-5h, obtains the shell containing built-in metal core for casting;
Described melting casting, is characterized in that shell being carried out under vacuum to centrifugal casting, and centrifugal rotational speed is 150-400r/min.
Embodiment tri-
The present invention is to provide the preparation method that there is the titanium alloy precision casting of elongated straight hole a kind of inside, it is characterized in that: the method comprises containing the wax-pattern preparation of built-in metal core, the Shell Preparation that contains built-in metal core and melting casting;
The described preparation of the wax-pattern containing built-in metal core, it is comprised of following steps:
Step 1: according to foundry goods elongated straight hole dimension processing metal core, and metallic core is sealed at both ends, described metallic core is the pure titanium pipe of TA1, internal diameter is 6mm;
Step 2: metallic core is put into and pressed wax-pattern tool to press wax, obtain the wax-pattern containing built-in metal core;
The described Shell Preparation containing built-in metal core, it is comprised of following steps:
Step 1: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out to electrical heating dewaxing, dewaxing temperature 100-300 ℃, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out to high-temperature roasting, sintering temperature 700-950 ℃, temperature retention time is 3-5h, obtains the shell containing built-in metal core for casting;
Described melting casting, is characterized in that shell being carried out under vacuum to centrifugal casting, and centrifugal rotational speed is 150-400r/min.
Claims (3)
1. contain a preparation method for the titanium or titanium alloy precision casting of elongated lumens, it is characterized in that: the method comprises containing the wax-pattern preparation of built-in metal core, the Shell Preparation that contains built-in metal core and melting casting;
(1) containing the wax-pattern preparation of built-in metal core, comprise the following steps:
Step 1: according to core cavity shape and dimensioned metallic core, and metallic core is sealed at both ends;
Step 2: metallic core is put into and pressed wax-pattern tool to press wax, obtain the wax-pattern containing built-in metal core;
(2) containing the Shell Preparation of built-in metal core, comprise the following steps:
Step 1: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out to electrical heating dewaxing, dewaxing temperature 100-300 ℃, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out to high-temperature roasting, sintering temperature 700-950 ℃, temperature retention time is 3-5h, obtains the shell containing built-in metal core for casting;
(3) melting casting, utilizes the shell containing built-in metal core under vacuum, to carry out centrifugal casting or gravity-assist pouring.
2. the preparation method of a kind of titanium or titanium alloy precision casting containing elongated lumens according to claim 1, it is characterized in that: described metallic core is titanium or the titanium alloy tubulose structure with thickness, material and casting material are identical or different, and metallic core internal diameter is identical with the internal diameter of core cavity.
3. kind according to claim 1, containing the preparation method of the titanium or titanium alloy precision casting of elongated lumens, is characterized in that: the centrifugal rotational speed of described centrifugal casting is 150-400r/min.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949589A (en) * | 2014-04-25 | 2014-07-30 | 西安航空动力股份有限公司 | Method for manufacturing bent equal-diameter holes in aluminum alloy castings by copper pipes |
| CN104923733A (en) * | 2015-05-15 | 2015-09-23 | 中国航空工业集团公司北京航空材料研究院 | Casting method of titanium or titanium alloy casting having special-shaped inner hole |
| CN104923732A (en) * | 2015-05-15 | 2015-09-23 | 中国航空工业集团公司北京航空材料研究院 | Method for casting titanium or titanium alloy casting with special-shaped inner hole |
| CN105234353A (en) * | 2015-10-22 | 2016-01-13 | 贵州安吉航空精密铸造有限责任公司 | Casting process for pipeline portion of casting with long and thin pipeline |
| CN105397026A (en) * | 2015-11-30 | 2016-03-16 | 贵州安吉航空精密铸造有限责任公司 | Casting process for forming complex pipeline in titanium alloy investment casting |
| CN105855467A (en) * | 2016-04-11 | 2016-08-17 | 青岛立博汽车零部件精密铸造有限公司 | Wax core inner die used for precision casting and wax core manufacture method |
| CN107138679A (en) * | 2017-05-05 | 2017-09-08 | 山东齐林电力设备股份有限公司 | Micro-vacuum precision casting process |
| CN108526403A (en) * | 2018-03-02 | 2018-09-14 | 蒋必强 | A kind of manufacturing method of belt buckle |
| CN113787168A (en) * | 2021-09-14 | 2021-12-14 | 河北光德精密机械股份有限公司 | Precise thread casting process for high-temperature alloy part |
| CN114406196A (en) * | 2021-12-31 | 2022-04-29 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped inner cavity |
| CN114425598A (en) * | 2021-12-31 | 2022-05-03 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped gap holes |
| CN114425605A (en) * | 2021-12-31 | 2022-05-03 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped inner cavity |
| CN115106482A (en) * | 2022-07-28 | 2022-09-27 | 中国科学院金属研究所 | Inner cavity forming and wall thickness size control process method for large-size hollow guide blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103949589A (en) * | 2014-04-25 | 2014-07-30 | 西安航空动力股份有限公司 | Method for manufacturing bent equal-diameter holes in aluminum alloy castings by copper pipes |
| CN104923733A (en) * | 2015-05-15 | 2015-09-23 | 中国航空工业集团公司北京航空材料研究院 | Casting method of titanium or titanium alloy casting having special-shaped inner hole |
| CN104923732A (en) * | 2015-05-15 | 2015-09-23 | 中国航空工业集团公司北京航空材料研究院 | Method for casting titanium or titanium alloy casting with special-shaped inner hole |
| CN105234353A (en) * | 2015-10-22 | 2016-01-13 | 贵州安吉航空精密铸造有限责任公司 | Casting process for pipeline portion of casting with long and thin pipeline |
| CN105397026A (en) * | 2015-11-30 | 2016-03-16 | 贵州安吉航空精密铸造有限责任公司 | Casting process for forming complex pipeline in titanium alloy investment casting |
| CN105855467A (en) * | 2016-04-11 | 2016-08-17 | 青岛立博汽车零部件精密铸造有限公司 | Wax core inner die used for precision casting and wax core manufacture method |
| CN105855467B (en) * | 2016-04-11 | 2018-05-29 | 青岛立博汽车零部件精密铸造有限公司 | A kind of hot investment casting wax tube filler inner mold and wax core production method |
| CN107138679A (en) * | 2017-05-05 | 2017-09-08 | 山东齐林电力设备股份有限公司 | Micro-vacuum precision casting process |
| CN108526403A (en) * | 2018-03-02 | 2018-09-14 | 蒋必强 | A kind of manufacturing method of belt buckle |
| CN113787168A (en) * | 2021-09-14 | 2021-12-14 | 河北光德精密机械股份有限公司 | Precise thread casting process for high-temperature alloy part |
| CN114406196A (en) * | 2021-12-31 | 2022-04-29 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped inner cavity |
| CN114425598A (en) * | 2021-12-31 | 2022-05-03 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped gap holes |
| CN114425605A (en) * | 2021-12-31 | 2022-05-03 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped inner cavity |
| CN114425605B (en) * | 2021-12-31 | 2023-10-27 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped inner cavity |
| CN114425598B (en) * | 2021-12-31 | 2023-10-27 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped slit holes |
| CN114406196B (en) * | 2021-12-31 | 2023-12-15 | 北京航空材料研究院股份有限公司 | Preparation method of titanium and titanium alloy casting containing special-shaped inner cavity |
| CN115106482A (en) * | 2022-07-28 | 2022-09-27 | 中国科学院金属研究所 | Inner cavity forming and wall thickness size control process method for large-size hollow guide blade |
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