CN108436037B - A method of inhibiting casting thermal fragmentation - Google Patents
A method of inhibiting casting thermal fragmentation Download PDFInfo
- Publication number
- CN108436037B CN108436037B CN201810141851.6A CN201810141851A CN108436037B CN 108436037 B CN108436037 B CN 108436037B CN 201810141851 A CN201810141851 A CN 201810141851A CN 108436037 B CN108436037 B CN 108436037B
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- CN
- China
- Prior art keywords
- shell
- casting
- thermal fragmentation
- inhibiting
- aqueous solution
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- 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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Links
- 238000005266 casting Methods 0.000 title claims abstract description 48
- 238000013467 fragmentation Methods 0.000 title claims abstract description 24
- 238000006062 fragmentation reaction Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 15
- 239000007864 aqueous solution Substances 0.000 claims abstract description 17
- 150000008064 anhydrides Chemical class 0.000 claims abstract description 14
- 238000007598 dipping method Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 23
- 239000011148 porous material Substances 0.000 claims description 21
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 229920002472 Starch Polymers 0.000 claims description 6
- 235000019698 starch Nutrition 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000004576 sand Substances 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 6
- 239000011521 glass Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 238000002803 maceration Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910004349 Ti-Al Inorganic materials 0.000 description 3
- 229910004692 Ti—Al Inorganic materials 0.000 description 3
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- -1 basic anhydride 5 Chemical compound 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A method of inhibiting casting thermal fragmentation, the shell for being used for casting is obtained using following steps: aqueous solution of the preparation containing alkaline hydrated oxide；Local dipping is carried out at the corresponding shell in position for being easy to appear hot tearing to casting using the aqueous solution containing alkaline hydrated oxide；Shell is roasted, shell of the part containing basic anhydride is obtained.Operation of the present invention is simple, 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 inhibit casting thermal fragmentation.
Background technique
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 the 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 to change alloying component to inhibit the generation of hot tearing by improving casting structure, but these measures
Limit the freedom degree of casting structure design and ingredient 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.
Summary of the invention
In order to solve above-mentioned technical problem, the purpose of the present invention is to provide a kind of sides for 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, having can easy to operate, method
Flexibly, the features such as high reliablity.
To reach the above technical purpose, the present invention adopts the following technical scheme:
A method of inhibiting casting thermal fragmentation, the shell for being used for casting is obtained using following steps: preparation contains alkali
The aqueous solution of property hydroxide；The position for being easy to appear hot tearing to casting using the aqueous solution containing alkaline hydrated oxide is corresponding
Second shell position carries out local dipping；Shell is roasted, so that basic anhydride are contained at 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；At the corresponding first shell position in the position that casting is easy to appear hot tearing, the sanding material for being mixed with pore creating material is used
Stucco operation is carried out, so that pore creating material is contained at the first shell position；Shell is roasted, 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 fraction.
Preferably, the alkaline hydrated oxide includes sodium hydroxide or potassium hydroxide, and concentration is 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 maturing temperature for the shell that basic anhydride are contained at the second shell position is
120 DEG C -800 DEG C, calcining time is -24 hours 1 minute.
Preferably, the backing layer at the corresponding shell in the first shell position that casting is easy to appear hot tearing 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 that and the technical effect of high-lighting:
1) present invention adds pore creating material in sanding material, does not influence the stability of slurry, can arbitrarily need 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 easy to operate, method is flexible, the features such as high reliablity；
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.
Detailed description of the invention
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 cup；2- shell；3- type chamber；4- pore creating material；5- basic anhydride；6- hole.
Specific embodiment
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 protection of the claims.In addition, in the present specification, attached drawing is drawn not in scale, and identical appended drawing reference
Indicate identical part.
A method of inhibiting casting thermal fragmentation, the shell for being used for casting obtained using following steps:
Prepare the aqueous solution containing alkaline hydrated oxide；
The position corresponding second shell portion that hot tearing is easy to appear to casting using the aqueous solution containing alkaline hydrated oxide
Position carries out local dipping；
Shell is roasted, so that basic anhydride are contained at 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；
At the corresponding first shell position in the position that casting is easy to appear hot tearing, using be mixed with the sanding material of pore creating material into
Row stucco operation, so that pore creating material is contained at the first shell position；
Shell is roasted, 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 fraction.
In one alternate embodiment, the alkaline hydrated oxide includes sodium hydroxide or potassium hydroxide, and concentration is
0.01%-20% mass fraction.
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 shell per cubic centimeter injection
0.01ml-1ml。
In one alternate embodiment, the maturing temperature of shell of the acquisition part containing basic anhydride is
120 DEG C -800 DEG C, calcining 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 with reference to the accompanying drawing 1,2
Illustrate an example.
As shown in Figure 1, the shell 2 formed has the type chamber 3 for being used to form casting, sprue cup 1 into type chamber 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.It is usually 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, surface layer preparation is carried out according to normal process, is generated to avoid to surface quality of continuous castings
It influences.Wherein, surface layer refers to wax-pattern close to that layer of 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) configured sodium hydrate aqueous solution is injected in the shell position at corresponding casting position easy to crack using syringe,
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, maturing temperature is 500 DEG C, and calcining 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 casting for carrying out titanium-aluminium alloy, the heating of casting process shell can be more than 1000 DEG C, and the local shell for being impregnated with sodium hydroxide is raw
At a large amount of glass phases.Glass phase refers to that each component and impurity generate shape after a series of physical, chemical reaction when high temperature sintering
At a kind of amorphous substance.The intensity of glass phase is lower than crystal phase, and a degree of softening can occur for shell in casting process,
The part shell is porous structure simultaneously, makes a concession under the action of casting is shunk, avoids Ti-Al alloy cast and solidified
Thermal fragmentation defect occurs in journey.
Operation of the present invention is simple, 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 above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of method for inhibiting casting thermal fragmentation, which is characterized in that obtain the shell for being used for casting using following steps:
Prepare the aqueous solution containing alkaline hydrated oxide；
The position corresponding second shell position that hot tearing is easy to appear to casting using the aqueous solution containing alkaline hydrated oxide into
Row part dipping；
Shell is roasted, so that basic anhydride are contained at 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；
At the corresponding first shell position in the position that casting is easy to appear hot tearing, spread using the sanding material for being mixed with pore creating material
Sand operation, so that pore creating material is contained at the first shell position；
Shell is roasted, 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 fraction.
4. the method according to claim 1 for inhibiting casting thermal fragmentation, which is characterized in that the aqueous solution packet of alkaline hydrated oxide
Sodium hydrate aqueous solution or potassium hydroxide aqueous solution are included, concentration is 0.01%-20% mass fraction.
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 maturing temperature be 120 DEG C -800 DEG C, calcining time be -24 hours 1 minute.
8. the method according to claim 2 for inhibiting casting thermal fragmentation, which is characterized in that be easy to appear 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108436037A CN108436037A (en) | 2018-08-24 |
| CN108436037B true CN108436037B (en) | 2019-11-22 |
Family
ID=63192401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810141851.6A Active CN108436037B (en) | 2018-02-11 | 2018-02-11 | A method of inhibiting casting thermal fragmentation |
Country Status (1)
| Country | Link |
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| CN (1) | CN108436037B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5439328B2 (en) * | 1972-06-15 | 1979-11-27 | ||
| 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 |
| CN104439081B (en) * | 2014-11-25 | 2017-08-08 | 苏氏工业科学技术（北京）有限公司 | For the casting mold in the pouring forming technology of metal casting and a kind of 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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2018
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| Publication number | Publication date |
|---|---|
| CN108436037A (en) | 2018-08-24 |
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