CN103521715B - A kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens - Google Patents

A kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens Download PDF

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Publication number
CN103521715B
CN103521715B CN201310404404.2A CN201310404404A CN103521715B CN 103521715 B CN103521715 B CN 103521715B CN 201310404404 A CN201310404404 A CN 201310404404A CN 103521715 B CN103521715 B CN 103521715B
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built
core
titanium
shell
casting
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CN103521715A (en
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鞠忠强
张美娟
王红
王红红
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Beijing Aeronautical Materials Research Institute Co.,Ltd.
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BEIJING BAIMU AERONAUTIC MATERIAL HIGH-TECHNOLOGY Co Ltd
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Abstract

The present invention relates to a kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens, this foundry goods is used for aerospace field.The method comprises to be prepared containing the wax-pattern of built-in metal core, containing the Shell Preparation of built-in metal core and melting casting.The titanium or titanium alloy foundry goods prepared by the method and built-in metal core fuse well, and effectively can solve the titanium or titanium alloy foundry goods of elongated lumens, particularly thin-wall precise foundry goods is difficult to shaping problem.

Description

A kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens
Technical field
The present invention relates to a kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens, this foundry goods is used for aerospace field.
Background technology
Titanium or titanium alloy investment casting is produced has the foundry goods of elongated lumens to be shaped mainly through using prefabricated ceramic core or metallic core, and manages to remove after foundry goods is cast.For ceramic core, when inner chamber is longer or it is special-shaped to be, internal diameter is more tiny, there is the problems such as depoling difficulty, cast inner wall fineness are low.For metallic core, due to the chemism of titanium or titanium alloy, the normal refractory metal that adopts manufactures core, but exist core without deformability, be difficult to cleaning, cost high, apply the problems such as restricted.Also have and adopt low-melting-point metal to manufacture core, Chinese invention patent application as publication number CN101745602A discloses a kind of preparation method of casting titanium alloy smelting mold meltable metal mold core, this metallic core Material selec-tion 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 having 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 investment foundry goods, this metallic core adopt pure titanium or with the material of foundry goods with the trade mark, its Baking temperature is 980 DEG C ~ 1020 DEG C, be incubated 4 ~ 4.5 hours, in order to alleviate the graphite powder of the metallic core problem of oxidation that long-time high-temperature roasting causes, filling high-temperature vacuum degasification in metallic core.Adopt the titanium alloy casting having elongated lumens of this explained hereafter, metallic core is due to through the above high-temperature roasting microstructure coarsening of β phase transition temperature, reduce foundry goods overall performance, the graphite powder of inner filling simultaneously needs specially treated before use, add production cost, and core cavity can be caused to pollute.Along with China develops the startup of large aircraft project and various new work engine research and development program element, body and the structure of titanium alloy casting become increasingly complex, and propose higher requirement to there being the quality and performance of the titanium or titanium alloy foundry goods of elongated lumens.
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, the method comprise prepare containing the wax-pattern of built-in metal core, containing built-in metal core Shell Preparation, melting casting;
(1) prepared by the wax-pattern containing built-in metal core, comprise the following steps:
Step one: according to core cavity shape and dimensioned metallic core, and metallic core two ends are sealed;
Step 2: metallic core is put into pressure wax-pattern tool and carry out pressure 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 one: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out electrical heating dewaxing, dewaxing temperature 100-300 DEG C, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out high-temperature roasting, sintering temperature 700-950 DEG C, and temperature retention time is 3-5h, obtains the shell of casting with containing built-in metal core;
(3) melting casting, utilizes the shell containing built-in metal core to carry out centrifugal casting or gravity-assist pouring under vacuo.
Described metallic core is titanium or the titanium alloy tubular structure with thickness, material and casting material identical or different, 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, prepared by the wax-pattern containing built-in metal core that the present invention mainly comprises, built-in tubular metallic insert can play the effect forming elongate cavity in foundry goods, without filling in core, effectively can improve the surface smoothness of core cavity.Then utilize wax-pattern to carry out Shell Preparation, and carrying out Baking lower than below titanium alloy beta phase transition temperature, be oxidized and microscopic structure alligatoring to avoid built-in metal whose surfaces.Finally utilize pouring technology, metallic core and molten metal are fused together, and then form elongate cavity in foundry goods.
Detailed description of the invention
The invention provides a kind of method that titanium or titanium alloy hot investment casting has elongated lumens foundry goods, the method comprise prepare containing the wax-pattern of built-in metal core, containing built-in metal core Shell Preparation, melting casting;
(1) prepared by the wax-pattern containing built-in metal core
This technique is made up of following steps:
Step one: according to core cavity shape and dimensioned metallic core, and metallic core two ends are sealed;
Described metallic core is titanium or the titanium alloy tubular structure with thickness, material can 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 pressure wax-pattern tool and carry out pressure wax, obtain the wax-pattern containing built-in metal core;
(2) containing the Shell Preparation of built-in metal core
This technique is made up of following steps:
Step one: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out electrical heating dewaxing, dewaxing temperature 100-300 DEG C, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out high-temperature roasting, sintering temperature 700-950 DEG C, and temperature retention time is 3-5h, obtains the shell of casting with containing built-in metal core;
3) melting casting
The shell containing built-in metal core is utilized to carry out centrifugal casting or gravity-assist pouring under vacuo.Centrifugal rotational speed is 150-400r/min.When in the shell that titanium liquid pours into containing built-in metal core, utilize the feature of molten metal high temperature by softening for metallic core surface, and around metallic core rapid shaping.
Embodiment one
The present invention is to provide the preparation method that there is the titanium alloy precision casting of L shape elongated lumens a kind of inside, it is characterized in that: the method comprises to be prepared containing the wax-pattern of built-in metal core, containing the Shell Preparation of built-in metal core and melting casting;
Prepared by the described wax-pattern containing built-in metal core, it is made up of following steps:
Step one: according to foundry goods L shape elongated lumens dimensioned metallic core, and metallic core two ends are sealed, described metallic core is the pure titanium pipe of TA2, and internal diameter is 8mm;
Step 2: L shape metallic core is put into pressure wax-pattern tool and carry out pressure wax, obtain the wax-pattern containing built-in metal core;
The described Shell Preparation containing built-in metal core, it is made up of following steps:
Step one: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out electrical heating dewaxing, dewaxing temperature 100-300 DEG C, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out high-temperature roasting, sintering temperature 700-950 DEG C, and temperature retention time is 3-5h, obtains the shell of casting with containing built-in metal core;
Described melting casting, is characterized in that shell to carry out gravity-assist pouring under vacuo.
Embodiment two
The present invention is to provide the preparation method that there is the titanium alloy precision casting of T-shaped elongated lumens a kind of inside, it is characterized in that: the method comprises to be prepared containing the wax-pattern of built-in metal core, containing the Shell Preparation of built-in metal core and melting casting;
Prepared by the described wax-pattern containing built-in metal core, it is made up of following steps:
Step one: according to foundry goods T-shaped elongated lumens dimensioned metallic core, and metallic core two ends are sealed, described metallic core is the pure titanium pipe of TA1, and internal diameter is 6mm;
Step 2: T-shaped metallic core is put into pressure wax-pattern tool and carry out pressure wax, obtain the wax-pattern containing built-in metal core;
The described Shell Preparation containing built-in metal core, it is made up of following steps:
Step one: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out electrical heating dewaxing, dewaxing temperature 100-300 DEG C, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out high-temperature roasting, sintering temperature 700-950 DEG C, and temperature retention time is 3-5h, obtains the shell of casting with containing built-in metal core;
Described melting casting, it is characterized in that shell to carry out centrifugal casting under vacuo, centrifugal rotational speed is 150-400r/min.
Embodiment three
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 to be prepared containing the wax-pattern of built-in metal core, containing the Shell Preparation of built-in metal core and melting casting;
Prepared by the described wax-pattern containing built-in metal core, it is made up of following steps:
Step one: according to foundry goods elongated straight hole dimension processing metal core, and metallic core two ends are sealed, described metallic core is the pure titanium pipe of TA1, and internal diameter is 6mm;
Step 2: metallic core is put into pressure wax-pattern tool and carry out pressure wax, obtain the wax-pattern containing built-in metal core;
The described Shell Preparation containing built-in metal core, it is made up of following steps:
Step one: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out electrical heating dewaxing, dewaxing temperature 100-300 DEG C, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out high-temperature roasting, sintering temperature 700-950 DEG C, and temperature retention time is 3-5h, obtains the shell of casting with containing built-in metal core;
Described melting casting, it is characterized in that shell to carry out centrifugal casting under vacuo, centrifugal rotational speed is 150-400r/min.

Claims (3)

1. containing the preparation method of titanium or titanium alloy precision casting for elongated lumens, it is characterized in that: the method comprises prepare containing the wax-pattern of built-in metal core, cast containing the Shell Preparation of built-in metal core and melting;
(1) prepared by the wax-pattern containing built-in metal core, comprise the following steps:
Step one: according to core cavity shape and dimensioned metallic core, and metallic core two ends are sealed; Metallic core is titanium or the titanium alloy tubular structure with thickness;
Step 2: metallic core is put into pressure wax-pattern tool and carry out pressure 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 one: utilize the wax mould case containing built-in metal core;
Step 2: shell is carried out electrical heating dewaxing, dewaxing temperature 100-300 DEG C, temperature retention time 1-4h;
Step 3: the shell after dewaxing is carried out high-temperature roasting, sintering temperature 700-950 DEG C, and temperature retention time is 3-5h, obtains the shell of casting with containing built-in metal core;
(3) melting casting, utilizes the shell containing built-in metal core to carry out centrifugal casting or gravity-assist pouring under vacuo.
2. the preparation method of a kind of titanium or titanium alloy precision casting containing elongated lumens according to claim 1, is characterized in that: material and the casting material of described metallic core are identical or different, and metallic core internal diameter is identical with the internal diameter of core cavity.
3. the preparation method of a kind of titanium or titanium alloy precision casting containing elongated lumens according to claim 1, is characterized in that: the centrifugal rotational speed of described centrifugal casting is 150-400r/min.
CN201310404404.2A 2013-09-07 2013-09-07 A kind of preparation method of the titanium or titanium alloy precision casting containing elongated lumens Active CN103521715B (en)

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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
CN104923733B (en) * 2015-05-15 2017-03-15 中国航空工业集团公司北京航空材料研究院 The casting method of titanium or titanium alloy casting with irregularly-shaped inner hole
CN104923732B (en) * 2015-05-15 2017-04-05 中国航空工业集团公司北京航空材料研究院 A kind of casting method of the titanium with irregularly-shaped inner hole or titanium alloy casting
CN105234353B (en) * 2015-10-22 2017-10-03 贵州安吉航空精密铸造有限责任公司 A kind of casting technique with slender pipeline casting pipeline position
CN105397026B (en) * 2015-11-30 2018-09-07 贵州安吉航空精密铸造有限责任公司 A kind of casting technique forming complex pipeline in titanium investment casting
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

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JP2005181948A (en) * 2003-12-19 2005-07-07 Art:Kk METHOD FOR MANUFACTURING SPECTACLE COMPONENTS, SPECTACLES AND SPECTACLE FRAME MADE OF FIRE-RETARDANT MAGNESIUM AND Ca-CONTAINING MAGNESIUM ALLOY CAST
US20080093043A1 (en) * 2006-10-20 2008-04-24 Joyner Victor F Method and casting media composition for creating foam sacrificial parts and investment models
FR2950825B1 (en) * 2009-10-01 2011-12-09 Snecma Improved process for manufacturing an annular assembly for lost wax turbomachine, metallic mold and wax model for implementing such a method
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Address after: No. 5 Yongxiang North Road, Haidian District, Beijing 100094

Patentee after: Beijing Bermuda Aircraft Material High-tech Co., Ltd.

Address before: No. 5 Yongxiang North Road, Haidian District, Beijing 100094

Patentee before: Beijing Baimu Aeronautic Material High-Technology Co., Ltd.

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Address after: No. 5 Yongxiang North Road, Haidian District, Beijing 100094

Patentee after: Beijing Aeronautical Materials Research Institute Co.,Ltd.

Address before: No. 5 Yongxiang North Road, Haidian District, Beijing 100094

Patentee before: BAIMTEC MATERIAL Co.,Ltd.

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