CN107755637A - A kind of method for eliminating directional solidification castings defect - Google Patents
A kind of method for eliminating directional solidification castings defect Download PDFInfo
- Publication number
- CN107755637A CN107755637A CN201710842979.0A CN201710842979A CN107755637A CN 107755637 A CN107755637 A CN 107755637A CN 201710842979 A CN201710842979 A CN 201710842979A CN 107755637 A CN107755637 A CN 107755637A
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- CN
- China
- Prior art keywords
- directional solidification
- casting
- orientation
- module
- defect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/045—Directionally solidified castings
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of method for eliminating directional solidification castings defect, comprise the following steps：1）According to orientation/single crystal casting technical requirements design modular structure, and complete the assembling of wax-pattern；2）Module entirety or it is local occur low between the senior middle school of both ends, when its vertical section has V-structure, the neck line higher than bottom and the upward terminal position away from running gate system, are bonded extension wax bar straight up on module；3）According to the method for model casting, module shell, dewaxing and roasting, formwork is completed；4）According to orientation/monocrystalline growing process, the manufacture of orientation/single crystal casting is completed.The present invention solves the defects of labyrinth directional solidification precision casting well.By in upward terminal position, the technological means of the extension wax bar of bonding straight up, realize " order extends growth end ", effective solution determines the growth defect to the upward terminal position of " V " type structure on solidification precision casting, such as misrun, free surface technical barrier.
Description
Technical field
The present invention relates to directional solidification precision-investment casting, specifically a kind of side for eliminating directional solidification castings defect
Method.
Background technology
Directional solidification precision-investment casting is that the thermograde of specific direction is established in investment casting shell, closes melting
A kind of casting technique that gold solidifies along the crystalline orientation of the direction opposite with hot-fluid as requested.Can using directional solidification technique
Obtain the column crystal of the direction of growth unidirectional growth consistent with principal direction of stress.Oriented freezing organization is due to eliminating horizontal crystalline substance
Boundary, so as to improve the ability of material high temperature creep-resisting and fatigue.The most prominent achievement of directional solidification technique is to be used to develop boat
Empty engine high-temperature alloy blades, in recent years, the high-temperature alloy blades of also gradual development and application to ground gas turbine make.
Solidification/casting is produced caused by contraction is liquid-solid-phase changeable essence.For traditional equiax crystal casting, as long as being formed
Consecutive solidification, the imperfect defect of tissue for having the types such as enough feeding liquid measures and unimpeded Feeding channel, shrinkage cavity is to be easy to
Solve.And promoted for directional solidification technique, solid/liquid interfaces in certain Formregelung, this is for low between the senior middle school of both ends
For its vertical section has the directional solidification castings of " V " type structure, the problem of there is feeding liquid measure and unimpeded Feeding channel.
As shown in figure 1, just having this " V " type structure in the bottom of blade body 3, bottom 5 is equal in bottom, two upward ends 6
Higher than neck line 7, if technological design needs the upward end 6 of " V " type structure by bottom 5 to go feeding, another is upward
End 6, because directional solidification is promoted according to solid/liquid interfaces direction of propulsion 9, its direction is with direction of heat flow 8 on the contrary, causing " V "
The bottom 5 of type structure first solidifies, and when solid/liquid interfaces are advanced into neck line 7, thus plugs the Feeding channel of design, as a result
Cause the upward end 6 of " V " type structure to push ahead the moment to the end in growth interface and cannot get free fluid to mend
Contracting and calking, complete smooth surface can not be formed, so cause casting should feeding position not only misrun but also surface
It is imperfect.
The content of the invention
The invention aims to solve above-mentioned technical problem, there is provided a kind of side for eliminating directional solidification castings defect
Method, this method can solve on directional solidification precision casting the growth defect of the upward terminal position of " V " type structure, finally ensure casting
Integrality.
Realize the technical scheme is that：A kind of method for eliminating directional solidification castings defect, it is characterised in that including
Following steps：
1）According to orientation/single crystal casting technical requirements design modular structure, and complete the assembling of wax-pattern；
2）Module entirety or it is local occur low between the senior middle school of both ends, when its vertical section has V-structure, be higher than on module
The neck line of bottom and the upward terminal position away from running gate system, are bonded extension wax bar straight up；
3）According to the method for model casting, module shell, dewaxing and roasting, formwork is completed；
4）According to orientation/monocrystalline growing process, the manufacture of orientation/single crystal casting is completed.
The step 2）In, the vertical section have the upward end of V-structure for two and more than.
The step 2）In, the most significant end for extending wax bar position and being higher than upward end.
The beneficial effects of the invention are as follows：
1st, the present invention solves the defects of labyrinth directional solidification precision casting well.By in upward terminal position, gluing
The technological means of extension wax bar straight up is connect, is realized " order extends growth end ", effective solution is determined to solidification essence
The growth defect of the upward terminal position of " V " type structure, such as misrun, free surface technical barrier on close casting.
2nd, " order extends growth end " of the invention, on the one hand can play a part of feeding blind area, on the other hand may be used
So that the free surface section of final set is drawn casting body, the final integrality for ensureing casting.
3rd, the present invention is simple to operate, it is easy to accomplish, greatly improve product qualification rate.
Brief description of the drawings
Fig. 1 is existing " V " type structural representation；
Fig. 2 is the structural representation of the embodiment of the present invention.
Label in figure：1-sprue cup, 2-cross gate, 3-blade body, 4-extension wax bar, 5-bottom, 6-upwards
End, 7-neck line, 8-direction of heat flow, 9-solid/liquid interfaces direction of propulsion.
Embodiment
As shown in Figure 1 and Figure 2, a kind of method for eliminating directional solidification castings defect, comprises the following steps：
1）According to orientation/single crystal casting technical requirements design modular structure, and complete the assembling of wax-pattern；
2）Module entirety or it is local occur it is low between the senior middle school of both ends, when its vertical section has " V " type structure, the height on module
Neck line 7 in bottom 5 and the upward terminal position 6 away from running gate system, are bonded extension wax bar 4 straight up；The extension
The position of wax bar 4 is higher than the most significant end of upward end 6.
3）According to the method for model casting, module shell, dewaxing and roasting, formwork is completed；
4）According to orientation/monocrystalline growing process, molten alloy is poured into formwork by sprue cup 1, cross gate 2, completion orientation/
The manufacture of single crystal casting.
The step 2）In, the vertical section have the upward end of V-structure for two and more than.
The present invention solves the defects of labyrinth directional solidification precision casting well.By in upward terminal position,
The technological means of the extension wax bar of bonding straight up, realizes " order extends growth end ", effective solution is determined to solidification
The growth defect of the upward terminal position of " V " type structure, such as misrun, free surface technical barrier on precision casting.
Claims (3)
- A kind of 1. method for eliminating directional solidification castings defect, it is characterised in that comprise the following steps：1）According to orientation/single crystal casting technical requirements design modular structure, and complete the assembling of wax-pattern；2）Module entirety or it is local occur low between the senior middle school of both ends, when its vertical section has V-structure, be higher than on module The neck line of bottom and the upward terminal position away from running gate system, are bonded extension wax bar straight up；3）According to the method for model casting, module shell, dewaxing and roasting, formwork is completed；4）According to orientation/monocrystalline growing process, the manufacture of orientation/single crystal casting is completed.
- 2. the method for directional solidification castings defect is eliminated according to claim 1, it is characterised in that：The step 2）In, institute State vertical section have the upward end of V-structure for two and more than.
- 3. the method for directional solidification castings defect is eliminated according to claim 1, it is characterised in that：The extension wax bar position Higher than the most significant end of upward end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710842979.0A CN107755637A (en) | 2017-09-18 | 2017-09-18 | A kind of method for eliminating directional solidification castings defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710842979.0A CN107755637A (en) | 2017-09-18 | 2017-09-18 | A kind of method for eliminating directional solidification castings defect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107755637A true CN107755637A (en) | 2018-03-06 |
Family
ID=61265105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710842979.0A Pending CN107755637A (en) | 2017-09-18 | 2017-09-18 | A kind of method for eliminating directional solidification castings defect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107755637A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716864A (en) * | 2017-09-18 | 2018-02-23 | 东方电气集团东方汽轮机有限公司 | A kind of method for repairing and mending of silica sol ceramic mold shell shake line |
| CN108465779A (en) * | 2018-06-25 | 2018-08-31 | 株洲中航动力精密铸造有限公司 | The bottom gating and pouring procedure of blade vertical-type guider |
| CN113560544A (en) * | 2021-06-28 | 2021-10-29 | 深圳市万泽中南研究院有限公司 | Directional blade and columnar crystal structure optimization method thereof |
| CN114160758A (en) * | 2021-12-08 | 2022-03-11 | 中国航发南方工业有限公司 | Pouring system of double-layer bidirectional integral guider casting and casting forming method thereof |
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| US4008052A (en) * | 1975-04-30 | 1977-02-15 | Trw Inc. | Method for improving metallurgical bond in bimetallic castings |
| SE7612972L (en) * | 1976-11-19 | 1978-05-20 | Trw Inc | WAY TO IMPROVE METALLURGIC BONDING BY BIMETALLIC CASTING |
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| CN105268916A (en) * | 2014-06-11 | 2016-01-27 | 中国科学院金属研究所 | Preparation technology for monocrystal turbine guide vane |
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| US4008052A (en) * | 1975-04-30 | 1977-02-15 | Trw Inc. | Method for improving metallurgical bond in bimetallic castings |
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| US20020114701A1 (en) * | 2001-02-22 | 2002-08-22 | Coulson Simon E. | Method of investment casting with casting identification |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716864A (en) * | 2017-09-18 | 2018-02-23 | 东方电气集团东方汽轮机有限公司 | A kind of method for repairing and mending of silica sol ceramic mold shell shake line |
| CN108465779A (en) * | 2018-06-25 | 2018-08-31 | 株洲中航动力精密铸造有限公司 | The bottom gating and pouring procedure of blade vertical-type guider |
| CN108465779B (en) * | 2018-06-25 | 2024-04-02 | 中国航发南方工业有限公司 | Bottom pouring type pouring system and pouring method of vertical vane guide |
| CN113560544A (en) * | 2021-06-28 | 2021-10-29 | 深圳市万泽中南研究院有限公司 | Directional blade and columnar crystal structure optimization method thereof |
| CN114160758A (en) * | 2021-12-08 | 2022-03-11 | 中国航发南方工业有限公司 | Pouring system of double-layer bidirectional integral guider casting and casting forming method thereof |
| CN114160758B (en) * | 2021-12-08 | 2024-01-23 | 中国航发南方工业有限公司 | Pouring system of double-layer bidirectional integral director casting and casting forming method thereof |
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Application publication date: 20180306 |