CN107008856B - The preparation method of precision castings formwork - Google Patents
The preparation method of precision castings formwork Download PDFInfo
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- CN107008856B CN107008856B CN201710127142.8A CN201710127142A CN107008856B CN 107008856 B CN107008856 B CN 107008856B CN 201710127142 A CN201710127142 A CN 201710127142A CN 107008856 B CN107008856 B CN 107008856B
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- pore
- formwork
- wax
- forming stick
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- 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
- B22C9/043—Removing the consumable pattern
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of preparation methods of precision castings formwork, comprising the following steps: pore-forming stick is arranged at the position that is easily split up that wax-pattern corresponds to formwork, is equipped with convex or recessed bending section in the middle part of pore-forming stick.Slurry is coated outside wax-pattern and pore-forming stick, and keeps the upper surface of pore-forming stick exposed.Wax-pattern and pore-forming stick are removed in dewaxing process, slurry forms formwork, and is correspondingly formed de-waxing channel in pore-forming stick position, and being formed in bending section position prevents sundries from entering the blocking portion in formwork.The upper end for sealing de-waxing channel, obtains precision castings formwork.The preparation method of above-mentioned precision castings formwork promotes de-waxing, formwork is avoided to crack in the position setting pore-forming stick that is easily split up of wax-pattern so that formwork forms de-waxing channel at the position.The bending section of pore-forming stick simultaneously, can make to form blocking portion on de-waxing channel, can prevent impurity from entering in formwork from de-waxing channel, to reduce slag inclusion probability of occurrence, guarantee precision castings qualification rate.
Description
Technical field
The present invention relates to hot investment casting fields, particularly, are related to a kind of preparation method of precision castings formwork.
Background technique
Casting formwork is by covering slurry and forming slurry curing through high steam dewaxing outside wax-pattern.Formwork is in high steam
In dewaxing process, since the wax liquor that wax-pattern is expanded or melted fails to exclude in time, big extruding force is generated to formwork, causes formwork
Cracking, this there are the formworks of crackle, and shell slag is easily brought in casting process, and casting is caused to scrap.Especially for being unable to repair welding
The formwork of impeller, rotor class precision castings is unfavorable for de-waxing, often occurs on the running channel of formwork since running gate system setting is single
Cracking, formwork quality not can guarantee, and the part slag inclusion after casting is serious, causes qualification rate low.
Summary of the invention
The technical issues of the present invention provides a kind of preparation methods of precision castings formwork, cracking to solve formwork.
The technical solution adopted by the invention is as follows:
A kind of preparation method of precision castings formwork, comprising the following steps:
Pore-forming stick is set at the position that is easily split up that wax-pattern corresponds to formwork, is equipped with convex or recessed bending in the middle part of pore-forming stick
Portion.
Slurry is coated outside wax-pattern and pore-forming stick, and keeps the upper surface of pore-forming stick exposed.
Wax-pattern and pore-forming stick are removed in dewaxing process, slurry forms formwork, and is correspondingly formed de-waxing in pore-forming stick position
Channel, and being formed in bending section position prevents sundries from entering the blocking portion in formwork.
The upper end for sealing de-waxing channel, obtains precision castings formwork.
Further, the upper end of pore-forming stick is expanded, and the upper end in de-waxing channel forms corresponding bulb, is equipped in bulb
Cock body is simultaneously fixed to seal de-waxing channel by lute filling.
Further, cock body is equipped with the stopper rod protruded into adjacent segment adjacent with bulb on de-waxing channel.
Further, the diameter ratio of cock body, adjacent segment and stopper rod is (1.1~1.3): 1:(0.8~0.9).
Further, lute is fire clay, and cock body and stopper rod are ceramic material.
Further, de-waxing channel extends to form blocking portion after bending downward upwards.
Further, pore-forming stick is set to easily being split up on position for wax-pattern running channel, the center line and wax-pattern running channel of pore-forming stick
Center line angle be 40~50 °.
Further, slurry point multilayer coats, and the process that coats of every layer of slurry is that one layer of extension is resistance to after coating a layer binder
Fiery material, binder include silica solution or silester, and refractory material includes mullite, corundum or vitreous silica.
Further, pore-forming stick is selected from one of rod wax, foam rods, resin rodlet and sticking plaster, it is preferable that pore-forming stick is
Rod wax.
Further, the process of dewaxing specifically:
At 160~183 DEG C, wax-pattern and pore-forming stick is made to melt volatilization using the steam of 6~10Bar.
The invention has the following advantages: the preparation method of above-mentioned precision castings formwork, being easily split up position and set in wax-pattern
It is set to hole stick, so that formwork forms de-waxing channel at the position, promotes de-waxing, formwork is avoided to crack.While pore-forming stick
Bending section can make to form blocking portion on de-waxing channel, can prevent impurity from entering in formwork from de-waxing channel, go out to reduce slag inclusion
Existing probability, guarantees precision castings qualification rate.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the pore-forming stick of the preferred embodiment of the present invention, cock body and stopper rod；
Fig. 2 is the wax-pattern and pore-forming stick connection schematic diagram of the preferred embodiment of the present invention；
Fig. 3 is to coat slurry schematic diagram in the wax-pattern of the preferred embodiment of the present invention and pore-forming stick molding stage；
Fig. 4 is the precision castings structural schematic diagram of the preferred embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the pore-forming stick of another preferred embodiment of the present invention, cock body and stopper rod；
Fig. 6 is the precision castings structural schematic diagram of another preferred embodiment of the present invention.
Description of symbols: 100, wax-pattern；200, pore-forming stick；300, formwork；400, de-waxing channel；210, bending section；
410, blocking portion；420, bulb；430, cock body；440, lute；450, stopper rod；A；Precision castings shaping area.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Referring to Fig.1~6, the preferred embodiment of the present invention provides a kind of preparation method of precision castings formwork, including following
Step:
Easily be split up position setting pore-forming stick 200 in the corresponding formwork 300 of wax-pattern 100, be equipped in the middle part of pore-forming stick 200 it is convex or
Recessed bending section 210.
Slurry is coated outside wax-pattern 100 and pore-forming stick 200, and keeps the upper surface of pore-forming stick 200 exposed.
Wax-pattern 100 and pore-forming stick 200 are removed in dewaxing process, slurry forms formwork 300, and in 200 position of pore-forming stick
It is correspondingly formed de-waxing channel 400, and forms the blocking portion 410 for preventing sundries from entering in formwork 300 in 210 position of bending section.
The upper end for sealing de-waxing channel 400, obtains precision castings formwork.
Formwork 300 is easily split up position and is usually located at 100 running channel of wax-pattern, and small part is located on the shell of corresponding part.For just
In description, pore-forming stick 200 is defined as upper end far from 100 one end of wax-pattern, and the one end connecting with wax-pattern 100 is defined as lower end.In wax
Pore-forming stick 200 is set on the corresponding position of mould 100, is such as bonded by adhesive, or heating makes its fusing in 200 lower end of pore-forming stick
Bonding.Referring to Fig. 2, the height of upper end is higher than the height of lower end, and pore-forming stick 200 is in be arranged obliquely.Referring to Fig. 3, in wax-pattern 100
Slurry is coated outside with pore-forming stick 200, one layer of slurry is often coated, wipes the slurry of the upper surface of pore-forming stick 200, keep its exposed, with
Guarantee that the opening in de-waxing channel 400 is smooth, avoids the formation of more shell slag.
Pore-forming stick 200 is easily molded, fusing point is lower, volatile, noresidue material is made.Dewaxing process can be used existing
Dewaxing mode in technology, in dewaxing process, wax-pattern 100 and pore-forming stick 200 volatilize, and slurry sintering curing forms formwork 300.At
The volatilization corresponding position of hole stick 200 forms de-waxing channel 400, and 210 position of bending section, which is formed, prevents sundries from entering the resistance in formwork 300
Stopper 410.Effectively the wax in dewaxing process is discharged for de-waxing channel 400, so that formwork 300 be avoided to crack, reduces shell
Slag.Therefore it is not easy slag inclusion occur in casting process, to improve the qualification rate of product.
If de-waxing channel 400 is straight wall tubular, sundries is as worked as 400 inner wall of impurity or de-waxing channel that careless manipulation is fallen into
Solid small particles are easy to enter from the upper end in de-waxing channel 400.And part portion is corresponded to inside the formwork 300 of precision component
Structure is complex, and sundries is not easy to pour out after entering, and leads to slag inclusion occur when casting.Referring to Fig. 4, blocking portion 410 it is convex or
Recessed, so that de-waxing channel 400 is non-straight wall tubular construction, when sundries enters from de-waxing channel 400, blocking portion 410 can hinder
It keeps off it to enter inside formwork 300, sundries is collected in blocking portion 410.The upper end for sealing de-waxing channel 400, such as can be in its peripheral hardware
Cock body 430 is set, is then sealed by lute 440 equal.Precision castings formwork is completed, casting, precision castings molding of the precision castings at A
Area's molding.
The invention has the following advantages: the preparation method of above-mentioned precision castings formwork, is easily split up position in wax-pattern 100
Pore-forming stick 200 is set, so that formwork 300 forms de-waxing channel 400 at the position, promotes de-waxing, formwork 300 is avoided to open
It splits.The bending section 210 of pore-forming stick 200 simultaneously can make to form blocking portion 410 on de-waxing channel 400, and impurity can be prevented logical from de-waxing
Road 400 enters in formwork 300, to reduce slag inclusion probability of occurrence, guarantees precision castings qualification rate.
Optionally, referring to Fig. 4, the upper end of pore-forming stick 200 is expanded, and the upper end in de-waxing channel 400 forms corresponding bulb
420, bulb 420 is interior to be equipped with cock body 430 and is fixed by the filling of lute 440 to seal de-waxing channel 400.
Cock body 430 is arranged in bulb 420, and the outer rim of cock body 430 is adapted to clearance fit with bulb 420, to guarantee
Leakproofness.The thickness of cock body 430 is less than the thickness of bulb 420, fills full bulb 420 using lute 440, is adhesively fixed
Cock body 430 and seal de-waxing channel 400.The contact area of 420 three of the design cock body 430, lute 440 and bulb
Greatly, therefore fixed and sealing effect is good, and in casting process, molten iron is not easy to pass out.
Optionally, referring to Fig.1 with 4, cock body 430 is equipped with and protrudes into adjacent segment adjacent with bulb 420 on de-waxing channel 400
Interior stopper rod 450.The design is so that sealing effect is more preferable.
Optionally, the diameter ratio of cock body 430, adjacent segment and stopper rod 450 is 1.1~1.3:1:0.8~0.9.In the ratio
Under, cock body 430, stopper rod 450 and 400 respective inner walls of de-waxing channel keep appropriate clearance, both can avoid because the small cock body 430 in gap,
Stopper rod 450 causes the wall body in de-waxing channel 400 or itself abrasion to cause sundries more, inside formwork 300, and can keep away
Exempt from because of gap larger impact sealing effect.
Optionally, referring to Fig. 4, lute 440 is fire clay, and cock body 430 and stopper rod 450 are ceramic material.Refractory day tools
There are certain viscosity, while high temperature resistant, therefore cock body 430 and the body of rod can be firmly fixed, can avoid making because high temperature loses viscosity
It is gone out at cock body 430 by molten iron.Ceramic material property is stablized, and will not react with molten iron, to guarantee that precision castings performance is stablized.
Optionally, referring to Fig. 4, de-waxing channel 400 extends to form blocking portion 410 after bending downward upwards.Pore-forming stick 200 is in
The setting of S type, de-waxing channel 400 forms corresponding shape.The upper part in de-waxing channel 400 and end portion are arranged in a staggered manner.On
The junction of end part and bending part is collection slag position.Above-mentioned design effectively can prevent sundries from entering, and further decrease slag inclusion
Probability of occurrence improves qualification rate.
Optionally, referring to Fig. 4, pore-forming stick 200 is set to easily being split up on position for 100 running channel of wax-pattern, in pore-forming stick 200
The angle of the center line of heart line and 100 running channel of wax-pattern is 40~50 °.Pore-forming stick 200 and wax-pattern 100 are at an angle.
Optionally, slurry point multilayer coats, and the process that coats of every layer of slurry is to hang one layer of fire resisting after coating a layer binder
Material, binder include silica solution or silester, and refractory material includes mullite, corundum or vitreous silica.
Optionally, pore-forming stick 200 is selected from one of rod wax, foam rods, resin rodlet and sticking plaster, it is preferable that pore-forming stick
200 be rod wax.Above-mentioned substance is readily volatilized substance, dewaxing at a temperature of, volatilize noresidue, will not be to casting quality
It impacts.The shape of rod wax can arbitrarily be changed, the corresponding de-waxing channel that different size is arranged with casting structure difference
400, application range is very wide.And rod wax is easily sticked on wax-pattern 100, and the bonding that can be consolidated is heated in its lower end.
Optionally, the process of dewaxing specifically:
At 160~183 DEG C, wax-pattern 100 and pore-forming stick 200 is made to melt volatilization using the steam of 6~10Bar.At this
Under the conditions of, thus wax-pattern 100 and pore-forming stick 200 can be removed all, noresidue.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of preparation method of precision castings formwork, which comprises the following steps:
It is easily split up position setting pore-forming stick (200) in wax-pattern (100) corresponding formwork (300), is set in the middle part of the pore-forming stick (200)
There are convex or recessed bending section (210)；The pore-forming stick (200) is rod wax；
Slurry is coated outside the wax-pattern (100) and the pore-forming stick (200), and keeps the upper surface of the pore-forming stick (200) naked
Dew；The pore-forming stick (200) is upper end far from wax-pattern (100) one end；
The wax-pattern (100) and the pore-forming stick (200) are removed in dewaxing process, the slurry forms formwork (300), and
Pore-forming stick (200) position is correspondingly formed de-waxing channel (400), and formation prevents sundries in the bending section (210) position
Into the blocking portion (410) in formwork (300)；
The upper end for sealing the de-waxing channel (400), obtains the precision castings formwork.
2. the preparation method of precision castings formwork according to claim 1, which is characterized in that the pore-forming stick (200) it is upper
End is expanded, and the upper end of the de-waxing channel (400) is formed corresponding bulb (420), and cock body is equipped in the bulb (420)
(430) and it is fixed to seal the de-waxing channel (400) by lute (440) filling；The lute (440) is fire resisting
Mud；The cock body (430) is ceramic material.
3. the preparation method of precision castings formwork according to claim 2, which is characterized in that the cock body (430), which is equipped with, stretches
Enter the stopper rod (450) in adjacent segment adjacent with the bulb (420) on the de-waxing channel (400)；The stopper rod (450)
For ceramic material.
4. the preparation method of precision castings formwork according to claim 3, which is characterized in that the cock body (430), the phase
The diameter ratio of adjacent section and the stopper rod (450) is (1.1~1.3): 1:(0.8~0.9).
5. the preparation method of precision castings formwork according to claim 1, which is characterized in that the de-waxing channel (400) to
The blocking portion (410) are extended to form after lower bending upwards.
6. the preparation method of precision castings formwork according to claim 1, which is characterized in that pore-forming stick (200) setting
In being easily split up on position for wax-pattern (100) running channel, in the center line and the wax-pattern (100) running channel of the pore-forming stick (200)
The angle of heart line is 40~50 °.
7. the preparation method of precision castings formwork according to claim 1, which is characterized in that the slurry point multilayer coats,
The process that coats of every layer of slurry is to hang one layer of refractory material after coating a layer binder, and the binder includes silica solution or silicic acid
Ethyl ester, the refractory material include mullite, corundum or vitreous silica.
8. the preparation method of precision castings formwork according to any one of claims 1 to 7, which is characterized in that the dewaxing
Process specifically:
At 160~183 DEG C, using the steam of 6~10Bar the wax-pattern (100) and the pore-forming stick (200) is melted and wave
Hair.
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| CN201710127142.8A CN107008856B (en) | 2017-03-06 | 2017-03-06 | The preparation method of precision castings formwork |
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| CN201710127142.8A CN107008856B (en) | 2017-03-06 | 2017-03-06 | The preparation method of precision castings formwork |
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| CN107812884B (en) * | 2017-11-06 | 2019-05-17 | 东方电气集团东方汽轮机有限公司 | Investment pattern precision casting auxiliary dewaxing mouth moulding process |
| CN109175288A (en) * | 2018-09-20 | 2019-01-11 | 贵州安吉航空精密铸造有限责任公司 | A kind of fusible pattern centrifugal casting formwork dewaxing mouth plugging device and its application method |
| CN109332590A (en) * | 2018-11-28 | 2019-02-15 | 贵州安吉航空精密铸造有限责任公司 | It is a kind of that the closed method of wax discharging port is carried out using casting formwork |
| CN109877276A (en) * | 2019-03-12 | 2019-06-14 | 北京百慕航材高科技有限公司 | The shell preparation method in the thick big region in the part of model casting part |
| CN110560636A (en) * | 2019-10-09 | 2019-12-13 | 西安皓森精铸有限公司 | Method for reducing shell cracking in investment casting process |
| CN110695317B (en) * | 2019-11-26 | 2021-08-17 | 温州万虹阀门有限公司 | Precise casting process of gate plate casting convenient for wax removal and exhaust |
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| CN114523069A (en) * | 2021-12-20 | 2022-05-24 | 江苏金瑞机械制造有限公司 | Mother alloy bar preparation formwork and preparation method thereof |
| CN115069980B (en) * | 2022-06-28 | 2024-08-06 | 河北钢研德凯科技有限公司 | Method for preparing investment casting shell by using wax removing plug and ceramic plug and application thereof |
| CN115889688B (en) * | 2022-12-09 | 2024-03-26 | 中国航发北京航空材料研究院 | Method for preventing foreign matters of hollow turbine blade from entering inner cavity |
| GB2625346A (en) * | 2022-12-14 | 2024-06-19 | Investment Casting Systems Ltd | Improvements relating to investment casting |
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Effective date of registration: 20190702 Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee after: China Hangfa South Industrial Co. Ltd. Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee before: Zhuzhou Air China power precision is cast with limit company |