CN108436037A - A method of inhibiting casting thermal fragmentation - Google Patents
A method of inhibiting casting thermal fragmentation Download PDFInfo
- Publication number
- CN108436037A CN108436037A CN201810141851.6A CN201810141851A CN108436037A CN 108436037 A CN108436037 A CN 108436037A CN 201810141851 A CN201810141851 A CN 201810141851A CN 108436037 A CN108436037 A CN 108436037A
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- CN
- China
- Prior art keywords
- shell
- casting
- thermal fragmentation
- inhibiting
- casting thermal
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- 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
Abstract
A method of inhibiting casting thermal fragmentation, the shell for casting is obtained using following steps：Prepare the aqueous solution containing alkaline hydrated oxide；Casting is susceptible to using the aqueous solution containing alkaline hydrated oxide at the corresponding shell in position of hot tearing and carries out local dipping；Shell is roasted, shell of the part containing basic anhydride is obtained.The present invention is easy to operate, flexible, highly reliable；By adjusting the solute component of maceration extract, concentration and dipping total amount, shell basic anhydride content is controlled, increases the generation of shell glass phase at high temperature, effectively improves the deformability of shell, it is suppressed that the generation of metal thermal fragmentation defect.
Description
Technical field
The present invention relates to field of mechanical technique, and in particular to a method of inhibiting casting thermal fragmentation.
Background technology
Model casting be with it is waxed make the part cast wax-pattern, be then coated on wax-pattern mud formation mud mould, and
Sprue gate is left when mud mould processed.After mud mould is dried, it is put into hot water and melts internal wax-pattern.The mud mould for having melted wax-pattern is taken out
It is fired into Tao Mo again.Molten metal is poured into from sprue gate again to be cast.Casting thermal fragmentation is most common casting in model casting
The titanium-aluminium alloy used in one of defect, especially aviation field, hot cracking tendency are fairly obvious.Hot tearing mainly by alloy property and
Mold resisting stress causes, and is currently but these measures by improving casting structure, changing alloying component to inhibit the generation of hot tearing
Limit the degree of freedom of casting structure design and composition design.And the structure and ingredient of some casting are stringent, such as part aviation
Ti-Al alloy cast is very stringent to structural requirement and component requirements, cannot change easily.Therefore, thermal fragmentation defect is always to perplex
The critical issue of practitioner.
Invention content
In order to solve above-mentioned technical problem, the purpose of the present invention is to provide a kind of sides inhibiting casting thermal fragmentation
Method, to solve the problems, such as that model casting medium casting especially Ti-Al alloy cast is easy hot tearing, with operable simple, method
Flexibly, the features such as reliability is high.
To reach the above technical purpose, the present invention adopts the following technical scheme that：
A method of inhibiting casting thermal fragmentation, the shell for casting is obtained using following steps：Preparation contains alkali
The aqueous solution of property hydroxide；The position for being susceptible to hot tearing to casting using the aqueous solution containing alkaline hydrated oxide is corresponding
Second shell position carries out local dipping；Roast shell so that contain basic anhydride in the second shell position.
Preferably, further comprising the steps of before preparing the aqueous solution containing alkaline hydrated oxide：Pore creating material is mixed into
Sanding material；It is susceptible to the position corresponding first shell position of hot tearing in casting, uses the sanding material for being mixed with pore creating material
Carry out stucco operation so that contain pore creating material in the first shell position；Roast shell so that the first shell position contains hole.
Preferably, the pore creating material includes starch or organic fiber, and additive amount is 0.01%-20% mass fractions.
Preferably, the alkaline hydrated oxide includes sodium hydroxide or potassium hydroxide, a concentration of 0.01%-20% mass point
Number.
Preferably, the part dipping is brushed using syringe injection or hairbrush.
Preferably, in the dipping of part, the injection volume of syringe is that shell per cubic centimeter injects 0.01ml-1ml.
Preferably so that the calcination temperature for the shell that basic anhydride are contained at the second shell position is
120 DEG C -800 DEG C, roasting time is -24 hours 1 minute.
Preferably, it is susceptible to the backing layer at the corresponding shell in the first shell position of hot tearing in casting and carries out stucco behaviour
Make.
Preferably, the first shell position and the second shell position are same area or different parts.
The present invention has the following advantages and the technique effect of high-lighting：
1) present invention adds pore creating material in sanding material, does not influence the stability of slurry, can arbitrarily be needed in shell
Place uses；Shell microstructure is controlled by adjusting type, the quantity of pore creating material, avoids declining to a great extent for investment shell intensity；
With the features such as easy to operate, method is flexible, and reliability is high；
2) by adjusting the type of basic anhydride solution, concentration, dip time controls containing for basic anhydride in shell
Amount, to control the generation of shell glass phase, is precisely controlled shell softening temperature point and softening degree, to reach accurate
Increase the purpose of shell deformability.
Description of the drawings
By the way that embodiment is described in conjunction with following accompanying drawings, features described above of the invention and technological merit will become
More understands and be readily appreciated that.
Fig. 1 is the shell schematic diagram of the invention containing pore creating material；
Fig. 2 is the shell schematic diagram after present invention dipping hydroxide and low-temperature bake.
Wherein 1- sprue cups；2- shells；3- cavities；4- pore creating materials；5- basic anhydride；6- holes.
Specific implementation mode
Below with reference to the accompanying drawings come describe it is of the present invention inhibit casting thermal fragmentation method embodiment.This field it is general
Logical technical staff will recognize, without departing from the spirit and scope of the present invention, can use a variety of different modes
Or combinations thereof described embodiment is modified.Therefore, attached drawing and description are regarded as illustrative in nature, rather than are used for
Limit scope of the claims.In addition, in the present specification, attached drawing is drawn not in scale, and identical reference numeral
Indicate identical part.
A method of inhibiting casting thermal fragmentation, the shell for casting is obtained using following steps：
Prepare the aqueous solution containing alkaline hydrated oxide；
The position corresponding second shell portion of hot tearing is susceptible to casting using the aqueous solution containing alkaline hydrated oxide
Position carries out local dipping；
Roast shell so that contain basic anhydride in the second shell position.
In one alternate embodiment, further comprising the steps of before preparing the aqueous solution containing alkaline hydrated oxide：
Pore creating material is mixed into sanding material；
The position corresponding first shell position of hot tearing is susceptible in casting, using be mixed with the sanding material of pore creating material into
Row stucco operates so that contains pore creating material in the first shell position；
Roast shell so that the first shell position contains hole.
Wherein, the position containing hole and the position containing basic anhydride can be the different parts of shell.Namely
It says, above-described first shell position and the second shell position can be the same area or different parts of shell.
In one alternate embodiment, the pore creating material includes starch or organic fiber, and additive amount is
0.01%-20% mass fractions.
In one alternate embodiment, the alkaline hydrated oxide includes sodium hydroxide or potassium hydroxide, a concentration of
0.01%-20% mass fractions.
In one alternate embodiment, part dipping is brushed using syringe injection or hairbrush.
In one alternate embodiment, in the dipping of part, the injection volume of syringe is injected for shell per cubic centimeter
0.01ml-1ml。
In one alternate embodiment, the calcination temperature of shell of the acquisition part containing basic anhydride is
120 DEG C -800 DEG C, roasting time is -24 hours 1 minute.
Fig. 1 is the shell schematic diagram of the invention containing pore creating material；Fig. 2 is after the present invention impregnates hydroxide and low-temperature bake
Shell schematic diagram.Simultaneously using the method for pore creating material and infiltration alkaline hydrated oxide, and make the first shell position and second
Shell position can obtain the better effect for preventing thermal fragmentation defect at the same position of shell, and below in conjunction with the accompanying drawings 1,2
Illustrate an example.
As shown in Figure 1, the shell 2 formed has the cavity 3 for being used to form casting, sprue cup 1 into cavity 3 for pouring
Liquid metal.Specifically describe how to obtain this for selecting starch, alkaline hydrated oxide to select sodium hydroxide with pore creating material 4 below
Shell 2.
1) it is mixed into the starch that mass fraction is 10% in sanding material, is uniformly mixed.
2) after the backing layer slashing operation of wax-pattern, the sanding material containing starch prepared is first easy cracking in casting
The corresponding shell position in position carry out stucco operation, reuse not amyloid sanding material after the completion and carry out whole stucco
Operation.Usually it is to carry out multiplicating starching, stucco on wax-pattern, to thicken shell.It obtains repeatedly as shown in Figure 1
Shell of the part containing pore creating material 4.Wherein, prepared by face layer carries out according to normal process, is generated to avoid to surface quality of continuous castings
It influences.Wherein, face layer refers to that layer of wax-pattern close to model, and backing layer is wax-pattern close to that outmost layer of shell.
3) dewaxing baking operation is dried, obtains the shell that a large amount of holes are contained in part.
4) sodium hydrate aqueous solution containing 10% mass fraction is prepared.
5) syringe is used to inject the sodium hydrate aqueous solution configured in the shell position at corresponding casting position easy to crack,
Injection volume is that shell per cubic centimeter injects 0.2 milliliter.
6) low-temperature bake is carried out to the shell for injecting sodium hydrate aqueous solution, calcination temperature is 500 DEG C, and roasting time is
6 hours, sodium hydroxide dehydration generated sodium oxide molybdena, i.e. basic anhydride 5, obtained part as shown in Figure 2 containing hole 6 and a large amount of
The shell of basic anhydride 5.
Will be illustrated next the shell is how to avoid casting thermal fragmentation.By taking titanium-aluminium alloy pours as an example, in the shell
The middle cast for carrying out titanium-aluminium alloy, the heating of casting process shell can be more than 1000 DEG C, be impregnated with the local shell life of sodium hydroxide
At a large amount of glass phases.Glass when referring to mutually high temperature sintering each component and impurity generate shape after a series of physical, chemical reaction
At a kind of amorphous substance.The intensity of glass phase is lower than crystalline phase, and a degree of softening can occur for shell in casting process,
The part shell is porous structure simultaneously, is made a concession under the action of casting is shunk, avoids Ti-Al alloy cast and solidified
Thermal fragmentation defect occurs in journey.
The present invention is easy to operate, flexible, highly reliable；It can be adjusted by adjusting the position of pore creating material, type and quantity
Shell microstructure, so that shell adapts to the casting of a variety of materials and structure；By adjusting the solute component of maceration extract, concentration and
Dip time controls shell basic anhydride content, increases the generation of shell glass phase at high temperature, effectively improves shell
Deformability, it is suppressed that the generation of metal thermal fragmentation defect.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of method inhibiting casting thermal fragmentation, which is characterized in that obtain the shell for casting using following steps：
Prepare the aqueous solution containing alkaline hydrated oxide；
Casting is susceptible to using the aqueous solution containing alkaline hydrated oxide the position corresponding second shell position of hot tearing into
Row part dipping；
Roast shell so that contain basic anhydride in the second shell position.
2. the method according to claim 1 for inhibiting casting thermal fragmentation, which is characterized in that contain alkaline hydrated oxide in preparation
Aqueous solution before it is further comprising the steps of：
Pore creating material is mixed into sanding material；
It is susceptible to the position corresponding first shell position of hot tearing in casting, is spread using the sanding material for being mixed with pore creating material
Sand operates so that contains pore creating material in the first shell position；
Roast shell so that the first shell position contains hole.
3. the method according to claim 2 for inhibiting casting thermal fragmentation, which is characterized in that the pore creating material includes starch or has
Machine fiber, additive amount are 0.01%-20% mass fractions.
4. the method according to claim 1 for inhibiting casting thermal fragmentation, which is characterized in that the alkaline hydrated oxide includes hydrogen
Sodium oxide molybdena or potassium hydroxide, a concentration of 0.01%-20% mass fractions.
5. the method according to claim 1 for inhibiting casting thermal fragmentation, which is characterized in that the part dipping uses syringe
Injection or hairbrush are brushed.
6. the method according to claim 5 for inhibiting casting thermal fragmentation, which is characterized in that in the dipping of part, the note of syringe
The amount of penetrating is that shell per cubic centimeter injects 0.01ml-1ml.
7. the method according to claim 1 for inhibiting casting thermal fragmentation, which is characterized in that so that alkali is contained at the second shell position
Property oxide shell calcination temperature be 120 DEG C -800 DEG C, roasting time be -24 hours 1 minute.
8. the method according to claim 2 for inhibiting casting thermal fragmentation, which is characterized in that be susceptible to the of hot tearing in casting
Backing layer at the corresponding shell in one shell position carries out stucco operation.
9. the method according to claim 2 for inhibiting casting thermal fragmentation, which is characterized in that the first shell position and the second shell
Position is same area or different parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141851.6A CN108436037B (en) | 2018-02-11 | 2018-02-11 | A method of inhibiting casting thermal fragmentation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141851.6A CN108436037B (en) | 2018-02-11 | 2018-02-11 | A method of inhibiting casting thermal fragmentation |
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| CN108436037A true CN108436037A (en) | 2018-08-24 |
| CN108436037B CN108436037B (en) | 2019-11-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4920025A (en) * | 1972-06-15 | 1974-02-22 | ||
| JPS5353519A (en) * | 1976-10-26 | 1978-05-16 | Honda Motor Co Ltd | Method to manufacture casting mould |
| CN103231016A (en) * | 2012-12-31 | 2013-08-07 | 湖北汽车工业学院 | Casting method of magnesium alloy casting |
| CN104439081A (en) * | 2014-11-25 | 2015-03-25 | 苏氏工业科学技术（北京）有限公司 | Casting mold used in casting molding process of metal casting and casting |
| CN105198475A (en) * | 2015-09-28 | 2015-12-30 | 西北工业大学 | Method for producing complex-shaped porous silicon nitride ceramic product |
-
2018
- 2018-02-11 CN CN201810141851.6A patent/CN108436037B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4920025A (en) * | 1972-06-15 | 1974-02-22 | ||
| JPS5353519A (en) * | 1976-10-26 | 1978-05-16 | Honda Motor Co Ltd | Method to manufacture casting mould |
| CN103231016A (en) * | 2012-12-31 | 2013-08-07 | 湖北汽车工业学院 | Casting method of magnesium alloy casting |
| CN104439081A (en) * | 2014-11-25 | 2015-03-25 | 苏氏工业科学技术（北京）有限公司 | Casting mold used in casting molding process of metal casting and casting |
| CN105198475A (en) * | 2015-09-28 | 2015-12-30 | 西北工业大学 | Method for producing complex-shaped porous silicon nitride ceramic product |
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|---|---|
| CN108436037B (en) | 2019-11-22 |
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