CN103920851A - Method for changing strength of shell by impregnating with organic binder - Google Patents
Method for changing strength of shell by impregnating with organic binder Download PDFInfo
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- CN103920851A CN103920851A CN201410077523.6A CN201410077523A CN103920851A CN 103920851 A CN103920851 A CN 103920851A CN 201410077523 A CN201410077523 A CN 201410077523A CN 103920851 A CN103920851 A CN 103920851A
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Abstract
The invention discloses a method for changing strength of a shell by impregnating with an organic binder. An impregnating solution adopts 0.5-4 wt% of a PVA solution, 2-20 wt% of a latex solution or a liquid with preset viscosity. Impregnation time is 2-10 min. impregnation is carried out layer by layer, every few layers or only at a slurry seal layer. After the shell is dried, the next layer of shell is continuously prepared, or dewaxing is conducted after the slurry seal layer is impregnated and dried. The method provided by the invention has high reliability and is simple to operate. Through adjusting type and concentration of the impregnating solution and number of impregnation layers, strength performance of shells made of various materials can be conveniently changed. Through impregnation, layer strength is increased; normal temperature strength of the shell is raised; dewaxing crack resistance is enhanced; combination of front and rear impregnated layers is weakened; retained strength is reduced; shelling performance is improved; and the problem that strength of a mould investment casting shell is hard to coordinate and control is solved.
Description
Technical field
The present invention relates to investment casting shell technical field, be specifically related to a kind of method that changes investment shell intensity by dipping organic binder bond.
Background technology
Strength character is one of investment casting shell most basic performance, and shell has three kinds of strength characters, i.e. normal temperature strength, elevated temperature strength and retained strength, and three has certain relation but is different.Silicasol case is one of at present the most frequently used shell, and its subject matter is, normal temperature strength is lower, and high temperature and retained strength are high.In dewaxing process, wax material expands and can produce higher effect of stress, the low shell crackle that easily causes of normal temperature strength to shell; And retained strength is high, be unfavorable for the cleaning after cast.
The method that changes at present investment shell intensity is mainly in slurry, to add fiber, latex etc.The Major Difficulties that adds fiber is that the kind of fiber, content, length etc. all can significantly affect the performance of slurry and shell, must select according to actual type shell material, viscosity etc.; Add latex simultaneously and can reduce the stability of slurry.And both all have high requirement to slurry preparation technique, stirring condition layer.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the object of the present invention is to provide a kind of method that changes investment shell intensity by dipping organic binder bond, by controlling layer intensity and the interlayer of shell, in conjunction with situation, change the intensity of shell, have that method is flexible, reliable results and a feature simple to operate.
For reaching above object, the present invention adopts following technical scheme:
By dipping organic binder bond, change a method for investment shell intensity, maceration extract adopts PVA solution that mass percentage concentration is 0.5%-4%, latex solution that mass percentage concentration is 2%-20% or has the liquid of default viscosity; Dip time is 2～10min, floods for successively, every which floor or only slurry seal layer carries out; After shell is dry, continue next stratotype shell of preparation, or dewax after slurry seal layer impregnation drying.
Advantage of the present invention is as follows:
1) employing the present invention does not change the preparation process of shell, does not affect characteristic and the stucco process of slurry, is not subject to the restriction of type shell material, shape;
2) the present invention can control the intensity of shell flexibly, by changing kind, maceration extract mass percentage concentration, the dip time of maceration extract, the number of plies of dipping etc., can arbitrarily control investment shell intensity, to reach, there is higher normal temperature strength, suitable elevated temperature strength and compared with the shell of low-residual intensity;
3) the inventive method is as being only slurry seal layer dipping, the interlayer that does not change shell only increased after shell to which floor intensity in conjunction with situation, increases shell normal temperature strength and do not affect shell high temperature, retained strength.
accompanying drawing explanation
Fig. 1 is the shell normal temperature strength column comparison diagram of the different impregnation solution of the embodiment of the present invention.
Fig. 2 is the hot strength of investment shell column comparison diagram of the different impregnation solution of the embodiment of the present invention.
Fig. 3 is the shell retained strength column comparison diagram of the different impregnation solution of the embodiment of the present invention.
The specific embodiment
The present invention aims to provide a kind of method that changes Mold Shell Strength in Lost Wax by dipping organic binder bond, not enough to solve current shell normal temperature strength, the problem that retained strength is too high.The different impregnation solution of Ludox-kaolin shell of take are example, and the present invention is described in further detail for specific embodiments and the drawings.
As table 1, be preparation and the impregnation technology process of shell, binding agent is Ludox GS30, and refractory material is calcined kaolin, and after interlayer drying time and dipping, be 24h drying time, and dip time is 5min.
Table 1 Shell Preparation technical process
Maceration extract: 00-without; L1-low content latex; L2-high-load gluing; P1-low content PVA; P2-high-load PVA; Si-Ludox
Shell normal temperature strength, elevated temperature strength and retained strength result as shown in Figure 1, Figure 2 and Figure 3.
As seen from the figure, it is fairly obvious that shell dipping strengthens effect, and conclusion is as follows:
1) PVA, latex all can significantly improve shell normal temperature strength
2) owing to weakening interlayer combination, PVA, latex all can reduce shell high temperature and retained strength
3) preparation process dipping latex can seriously reduce shell high temperature and retained strength, so latex only can be used for the dipping of slurry seal layer.
4) by controlling mass percentage concentration, the dipping number of plies and the dip time of PVA maceration extract, can change shell bulk strength by controlling shell individual layer and interlayer combination, obtain having higher normal temperature and elevated temperature strength, compared with the shell of low-residual intensity.
Claims (1)
1. by dipping organic binder bond, change a method for investment shell intensity, it is characterized in that: maceration extract adopts PVA solution that mass percentage concentration is 0.5%-4%, latex solution that mass percentage concentration is 2%-20% or has the liquid of default viscosity; Dip time is 2～10min, floods for successively, every which floor or only slurry seal layer carries out; After shell is dry, continue next stratotype shell of preparation, or dewax after slurry seal layer impregnation drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077523.6A CN103920851B (en) | 2014-03-04 | 2014-03-04 | A kind of method changing investment shell intensity by dipping organic binder bond |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077523.6A CN103920851B (en) | 2014-03-04 | 2014-03-04 | A kind of method changing investment shell intensity by dipping organic binder bond |
Publications (2)
| Publication Number | Publication Date |
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| CN103920851A true CN103920851A (en) | 2014-07-16 |
| CN103920851B CN103920851B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410077523.6A Active CN103920851B (en) | 2014-03-04 | 2014-03-04 | A kind of method changing investment shell intensity by dipping organic binder bond |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399886A (en) * | 2014-11-03 | 2015-03-11 | 西安航空动力股份有限公司 | Shuttering reinforcing layer slurry preparation method and shuttering processing method |
| RU2625859C2 (en) * | 2015-08-05 | 2017-07-19 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") | Method of manufacture of foundry high-fire-reinforced ceramic forms |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS55106657A (en) * | 1979-02-09 | 1980-08-15 | Janome Sewing Mach Co Ltd | Forming method of mold for precision casting |
| JPS5617157A (en) * | 1979-07-18 | 1981-02-18 | Kubota Ltd | Reinforcing method of ceramic shell mold |
| CN1032503A (en) * | 1987-10-12 | 1989-04-26 | 国家机械工业委员会沈阳铸造研究所 | Compound shell-producing technology using silica-sol wash |
| CN1414054A (en) * | 2002-09-16 | 2003-04-30 | 章浩龙 | Silica collosol binder and its manufacturing method |
| CN1438082A (en) * | 2002-09-16 | 2003-08-27 | 章浩龙 | Silicon-sol adhesive and preparing method |
| CN101104195A (en) * | 2007-08-02 | 2008-01-16 | 哈尔滨工业大学 | Method for preparing casting titanium and titanium-aluminum base alloy porous ceramic mould shell |
-
2014
- 2014-03-04 CN CN201410077523.6A patent/CN103920851B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55106657A (en) * | 1979-02-09 | 1980-08-15 | Janome Sewing Mach Co Ltd | Forming method of mold for precision casting |
| JPS5617157A (en) * | 1979-07-18 | 1981-02-18 | Kubota Ltd | Reinforcing method of ceramic shell mold |
| CN1032503A (en) * | 1987-10-12 | 1989-04-26 | 国家机械工业委员会沈阳铸造研究所 | Compound shell-producing technology using silica-sol wash |
| CN1414054A (en) * | 2002-09-16 | 2003-04-30 | 章浩龙 | Silica collosol binder and its manufacturing method |
| CN1438082A (en) * | 2002-09-16 | 2003-08-27 | 章浩龙 | Silicon-sol adhesive and preparing method |
| CN101104195A (en) * | 2007-08-02 | 2008-01-16 | 哈尔滨工业大学 | Method for preparing casting titanium and titanium-aluminum base alloy porous ceramic mould shell |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399886A (en) * | 2014-11-03 | 2015-03-11 | 西安航空动力股份有限公司 | Shuttering reinforcing layer slurry preparation method and shuttering processing method |
| CN104399886B (en) * | 2014-11-03 | 2016-09-14 | 西安航空动力股份有限公司 | A kind of formwork back-up coat slurry preparation method and formwork processing method |
| RU2625859C2 (en) * | 2015-08-05 | 2017-07-19 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") | Method of manufacture of foundry high-fire-reinforced ceramic forms |
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| Publication number | Publication date |
|---|---|
| CN103920851B (en) | 2016-08-17 |
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