CN108246976A - A kind of ceramic shell process for dewaxing - Google Patents
A kind of ceramic shell process for dewaxing Download PDFInfo
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- CN108246976A CN108246976A CN201711407482.2A CN201711407482A CN108246976A CN 108246976 A CN108246976 A CN 108246976A CN 201711407482 A CN201711407482 A CN 201711407482A CN 108246976 A CN108246976 A CN 108246976A
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- ceramic shell
- dewaxing
- heat resistant
- wax
- outside
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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
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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
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- Mechanical Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of ceramic shell process for dewaxing, including：To set thickness for starting point at the mouth that dewaxes it is in the heat resistant layer by being as thin as thick differentiation outside the ceramic shell before the ceramic shell with wax-pattern enters dewaxing process；Ceramic shell with wax-pattern and heat resistant layer is put into dewaxing device, makes the dewaxing mouth down on ceramic shell, the most thin region of heat resistant layer outside ceramic shell is in vertical bottom, most thick region is in vertical the top；Ceramic shell with wax-pattern and heat resistant layer enters after dewaxing process, by the heat resistant layer outside ceramic shell dewaxing heat is absorbed by the wax-pattern gradual change inside sequential control ceramic shell from bottom to top, the wax-pattern inside ceramic shell is made, as fusing starting point, to dewax using at the mouth that dewaxes by the sequence realization from bottom to top sequence of ecto-entad.It can reduce or directly cancel the auxiliary dewaxing mouth on ceramic shell, effectively and reliably ensure the molding qualification rate of ceramic shell dewaxing and quality.
Description
Technical field
The present invention relates to the ceramic shell forming technique of precision-investment casting, specifically a kind of ceramic shell dewaxing side
Method.
Background technology
Precision-investment casting is also known as lost-wax casting, is to make the wax-pattern for the part cast with waxed, then be stained on wax-pattern
The husky obtained ceramic shell of slurry leaching, then fusing slough the wax-pattern inside ceramic shell and obtain the type of the matching part cast
Molten metal is finally cast into the cavity of ceramic shell and casting by chamber under certain process conditions.Precision-investment
Casting institute's mould casting has the technological merits such as precision is high, surface quality is good, post-production amount is few, thus has obtained widely should
With especially in terms of unmanageable alloy-steel casting molding such as high temperature alloy.
As described above, the cavity of ceramic shell is obtained to melt the wax-pattern sloughed inside ceramic shell, i.e., it is ceramic
Shell dewaxing is an important procedure of precision-investment casting.
In the dewaxing process of ceramic shell, due to the coefficient of thermal expansion of wax-pattern want several times be more than ceramic shell, if nothing
Method solves this technical problem, then ceramic shell spalling generation is caused to be split when wax-pattern can easily occur because melting dilation in dewaxing
Line, the technical issues of scrapping.In view of this, the technical measures generally taken in industry are the dewaxing difficulty position settings on wax-pattern
The wax liquor of fusing in dewaxing by preset auxiliary dewaxing mouth out of ceramic shell is discharged, treats residual wax by auxiliary dewaxing mouth
After burn off, then with the auxiliary dewaxing mouth on refractory material closure ceramic shell；In order to which ceramic shell will not generate when ensureing dewaxing
Crackle, in general, the auxiliary dewaxing mouth of up to ten or more can be set on a module.
However, it is brought in these auxiliary dewaxing mouths after ceramic shell completes the dewaxing easily cavity to ceramic shell
Foreign matter, this especially falls into cavity with the refractory material during the closure of auxiliary dewaxing mouth and highlights the most.Once ceramic mould
Impurity is fallen into the cavity of shell, it is difficult to be removed totally, this is again especially with the complicated gas turbine turbine blade of construction or boat
The ceramic shell of empty engine turbine blade precision-investment casting is the most apparent.It is unquestionable, it is fallen in ceramic shell cavity
The impurity entered, which can not be removed, totally, then can make to be mingled with the casting generation of this cavity institute moulding by casting, and casting is caused to be scrapped.It is conventional
Technical measures be, on ceramic shell auxiliary dewaxing mouth and block process strengthen management and control, with caution operation, it is miscellaneous to avoid as possible
Matter falling into ceramic shell cavity there is no effective, stable, reliable, practical effective technical measures.
At present, the technical issues of in industry for present in ceramic shell dewaxing, most study is how effectively to drop
Crackle of the low ceramic shell in dewaxing process generates, i.e., how on ceramic shell reasonably setting auxiliary dewaxing mouth or
How to prevent be also easy to produce crack site of the ceramic shell in dewaxing and expand crackle（Such as " a kind of prevention ceramic shell is opened
The method split ", publication number CN 106853508, publication date on June 16th, 2017）Deng.Rarely have how research controls ceramic shell
The dewaxing sequence of interior wax-pattern, in disclosed prior art, have no to control dewaxing sequence and reduce on ceramic shell
Auxiliary dewaxing mouth or cancel auxiliary dewaxing mouth, simultaneously effective ensure that the technology of low cracking breakout of the ceramic shell in dewaxing is ground
Study carefully achievement to be disclosed.
Invention content
The technical purpose of the present invention is：In view of the above shortcomings of the prior art, independent research one kind is suitable to control dewaxing
Sequence and reduce the dewaxing mouth of the auxiliary on ceramic shell or directly cancel auxiliary dewaxing mouth, simultaneously effective ensure ceramic shell de-
The ceramic shell process for dewaxing of low cracking breakout during wax.
The present invention realizes its technical purpose the technical scheme adopted is that a kind of ceramic shell process for dewaxing, the dewaxing
Method includes following technological measure：
Before the ceramic shell with wax-pattern enters dewaxing process, to be set at the mouth that dewaxes for starting point outside the ceramic shell
Thickness is in the heat resistant layer by being as thin as thick differentiation；
Ceramic shell with wax-pattern and heat resistant layer is put into dewaxing device, makes the dewaxing mouth down on ceramic shell, ceramics
The most thin region of heat resistant layer outside shell is in vertical bottom, most thick region is in vertical the top；
Ceramic shell with wax-pattern and heat resistant layer enters after dewaxing process, is pressed under by the heat resistant layer outside ceramic shell
Wax-pattern gradual change inside sequential control ceramic shell on and absorbs dewaxing heat, makes the wax-pattern inside ceramic shell with the mouth that dewaxes
Place dewaxes as fusing starting point by the sequence realization from bottom to top sequence of ecto-entad.
One of preferably, the thickness of heat resistant layer set by outside the ceramic shell, inside ceramic shell
The dewaxing rule of sequence from low to uper part from outside to inside of wax-pattern setting, is incremented by by being as thin as thick gradual change.
One of preferably, the heat resistant layer outside the ceramic shell is unformed fusible substance, and the nothing is determined
Type is fusible, and substance is arranged in paste, in a manner of viscous leaching or coating outside ceramic shell；The unformed fusible substance
Fusing point is less than dewaxing temperature, and the fusible substance can lose in ceramic shell melted outside, burning.Further, the nothing
Fusible substance of shaping includes paraffin or microwax.Alternatively, the heat resistant layer outside the ceramic shell is stratiform heat resistant material, institute
Stratiform heat resistant material is stated to be arranged in outside ceramic shell with stratiform package structure；The fusing point of layered heat resistant material is higher than dewaxing
Temperature, and mistake outside ceramic shell can be dismantled and/or be burnt to layered heat resistant material.Further, layered thermal resistance
Material includes heat-insulation blanket, masking foil and/or aluminium-foil paper.
As alternatively possible scheme, without heat resistant layer outside the dewaxing mouth of the ceramic shell.
One of preferably, the dewaxing mouth on the ceramic shell is sprue cup.
One of preferably, the ceramic shell is melted for gas turbine turbine blade or aero engine turbine blades
The ceramic shell of mould hot investment casting.
The method have the benefit that：
1. the present invention removes the wax-pattern in ceramic shell, realized with the specific heat resistant layer set by ceramic shell outside
The sequence from low to uper part dewaxing of ecto-entad, the wax-pattern in ceramic shell is made to absorb dewaxing heat with gradual change type with this, avoided
Thermal expansion problem caused by whole heat absorption simultaneously and melt-through, so as to the thermal expansion of effectively and reliably control wax-pattern fusing,
I.e. to the control of dewaxing sequence without eliminating the thermal expansion problem of wax-pattern fusing by the auxiliary dewaxing mouth on ceramic shell,
That is, effective, the stability contorting of the invention with the sequence that dewaxes, and reduce the dewaxing mouth of the auxiliary on ceramic shell or directly take
Disappear auxiliary dewaxing mouth, so as to avoid the problem that because auxiliary dewaxing mouth there are due to bringing impurity in ceramic shell cavity, together
When, with effective, the stability contorting of dewaxing sequence, it can effectively and reliably ensure low cracking breakout of the ceramic shell in dewaxing, into
And effective, stabilization, the reliably molding qualification rate of raising ceramic shell dewaxing and quality, it is highly practical；
2. the thickness set by outside ceramic shell of the present invention, can further effectively, surely by the incremental heat resistant layer of rule gradual change
It is fixed, reliably control the wax-pattern in ceramic shell with gradual change type rule, sequence absorption dewaxing heat or delay the heat that dewaxes
Conduction.
Description of the drawings
Fig. 1 is a kind of status diagram of the present invention.
Code name meaning in figure：1-wax-pattern；2-sprue cup；3-ceramic shell；4-heat resistant layer.
Specific embodiment
The present invention relates to the ceramic shell forming technique of precision-investment casting, specifically a kind of ceramic shell dewaxing side
Method.The technology contents of the present invention are clearly and detailedly illustrated with multiple embodiments below, wherein, embodiment 1 combines explanation
Book attached drawing-i.e. Fig. 1 is detailed to the technology contents progress of the present invention, clearly demonstrates, though other embodiments do not draw attached drawing individually,
But its agent structure still can refer to the attached drawing of embodiment 1.
Embodiment 1
Shown in Figure 1, the present invention is the ceramic shell process for dewaxing of gas turbine turbine blade precision-investment casting, is wrapped
Include following technological measure：
It makes and meets ceramic shell 3 that dewaxing procedure requires, with wax-pattern 1, dewax on the ceramic shell 3 without auxiliary
Mouth structure designs；
With wax-pattern 1 ceramic shell 3 enter dewaxing process before, using the sprue cup 2 on ceramic shell 3 as dewax mouth,
In the outside of ceramic shell 3 with the mouth that dewaxes（That is sprue cup 2）It is in the thermal resistance by being as thin as thick differentiation to locate to set thickness for starting point
Layer 4, specifically：Using the outside at the dewaxing mouth of ceramic shell 3 as starting point, fusing point less than 3 inside wax-pattern 1 of ceramic shell and is burnt
In such as paraffin of the minimum unformed fusible substance of 3 outside residual ash of ceramic shell-preferably after mistake, with coating after fusing（Or
Paste or glue leaching）Mode is arranged on ceramic shell 3, and external in ceramic shell 3 forms heat resistant layer 4, which exists
The dewaxing rule of sequence from outside to inside that thickness outside ceramic shell 3 is set according to 3 inside wax-pattern of ceramic shell, in by being as thin as
Thick gradual change is incrementally molded, when coming off due to the mouth down that dewaxes, i.e., the heat resistant layer 4 at 3 outside dewaxing mouth of ceramic shell it is most thin,
Tail portion on the other side-i.e. top is then most thick, and usual heat resistant layer 4 is incremented by by the 10mm gradual changes in 1mm to the thickness of thinnest part；
Ceramic shell 3 with wax-pattern 1 and heat resistant layer 4 is put into steam dewaxing equipment, make dewaxing mouth on ceramic shell 3-
Sprue cup 2 downward, the most thin region of heat resistant layer 4 outside ceramic shell 3 is in vertical bottom, most thick region be in it is vertical
The top；
Start steam dewaxing equipment to dewax with high-temperature high-pressure steam, in general, dewaxing temperature is 170 DEG C, steam pressure is
0.7Mpa, dewaxing time are 2~5 minutes；It can be seen that the fusing point of above-mentioned unformed fusible substance is less than dewaxing temperature
's；
Ceramic shell 3 with wax-pattern 1 and heat resistant layer 4 is after the process that dewaxes is entered, by the heat resistant layer 4 outside ceramic shell 3
Dewaxing heat is absorbed first（That is " material melts heat absorption " principle）, the difference based on 4 thickness of heat resistant layer in particular directions, thermal resistance
1 part of wax-pattern corresponding to 4 thinner region of layer takes the lead in melting, and 1 part of wax-pattern corresponding to 4 thicker region of heat resistant layer is melted after then delaying
To change, i.e., by the wax-pattern 1 inside sequential control ceramic shell 3 from bottom to top, from bottom to top gradual change absorbs dewaxing heat to heat resistant layer 4,
Make the wax-pattern 1 inside ceramic shell 3 using at the mouth that dewaxes as fusing starting point, by the sequence realization from bottom to top sequence of ecto-entad
Dewaxing；
The ceramic shell for the completion that dewaxes is put into high-temperature roasting furnace, 600~900 DEG C is heated to and heat preservation burn-up in 2~4 hours is residual
Remaining wax material, until finished product；The sprue cup of ceramic shell is sealed with clean plastic film prevents exogenous impurity from entering inside cavity, will make pottery
It is spare that porcelain shell makees cast.
Embodiment 2
The present invention is the ceramic shell process for dewaxing of gas turbine turbine blade precision-investment casting, is arranged including following technique
It applies：
It makes and meets dewaxing procedure requirement, ceramic shell with wax-pattern, dewax mouth knot without auxiliary on the ceramic shell
Structure designs；
Before the ceramic shell with wax-pattern enters dewaxing process, using the sprue cup on ceramic shell as dewaxing mouth, making pottery
The outside of porcelain shell is with the mouth that dewaxes（That is sprue cup）It is in the heat resistant layer by being as thin as thick differentiation to locate to set thickness for starting point, specifically
's：Using the outer root at ceramic shell dewaxing mouth as starting point, making pottery by fusing point less than wax-pattern inside ceramic shell and after burning mistake
Such as microwax of the minimum unformed fusible substance of residual ash outside porcelain shell-preferably, with coating after fusing（Or paste, also
Or viscous leaching）Mode is arranged on ceramic shell, and heat resistant layer is formed with the external of exterior domain in the dewaxing mouth of ceramic shell, i.e., ceramic
Without heat resistant layer outside the dewaxing mouth of shell, thickness of the heat resistant layer outside ceramic shell outside ceramic shell is according to ceramic shell
The dewaxing rule of sequence from outside to inside of internal wax-pattern setting, is incrementally molded in by being as thin as thick gradual change, when coming off due to de-
Heat-sink shell outside wax mouth down, i.e. ceramic shell at dewaxing mouth root is most thin, tail portion on the other side-i.e. top is then most thick,
Usual heat-sink shell is incremented by by the 12mm gradual changes in 5mm to the thickness of thinnest part；
Ceramic shell with wax-pattern and heat resistant layer is put into steam dewaxing equipment, makes dewaxing mouth-cast gate on ceramic shell
Downward, the most thin region of heat resistant layer outside ceramic shell is in vertical bottom to cup, most thick region is in vertical the top；
Start steam dewaxing equipment to dewax with high-temperature high-pressure steam, in general, dewaxing temperature is 170 DEG C, steam pressure is
0.68Mpa, dewaxing time are 2~5 minutes；It can be seen that the fusing point of above-mentioned unformed fusible substance is less than dewaxing temperature
's；
Ceramic shell with wax-pattern and heat resistant layer is after the process that dewaxes is entered, and the wax-pattern at ceramic shell dewaxing mouth is at first
It absorbs dewaxing heat and melts, ceramic shell other parts then absorb dewaxing heat first by the heat resistant layer outside ceramic shell
（That is " material melts heat absorption " principle）, the difference based on thermal resistance layer thickness in particular directions, as the wax-pattern at dewaxing mouth melts
After change, the wax-pattern part corresponding to heat resistant layer thinner region takes the lead in melting, and the wax-pattern part corresponding to heat resistant layer thicker region is then
It is melted after slow, i.e., by the wax-pattern inside sequential control ceramic shell from bottom to top, from bottom to top gradual change absorbs dewaxing heat to heat resistant layer
Amount makes the wax-pattern inside ceramic shell, as fusing starting point, be realized from bottom to top by the sequence of ecto-entad suitable using at the mouth that dewaxes
Sequence dewaxes；
The ceramic shell for the completion that dewaxes is put into high-temperature roasting furnace, 600~900 DEG C is heated to and heat preservation burn-up in 2~4 hours is residual
Remaining wax material, until finished product；The sprue cup of ceramic shell is sealed with clean plastic film prevents exogenous impurity from entering inside cavity, will make pottery
It is spare that porcelain shell makees cast.
Embodiment 3
The present invention is the ceramic shell process for dewaxing of aero engine turbine blades precision-investment casting, including following technique
Measure：
It makes and meets dewaxing procedure requirement, ceramic shell with wax-pattern, dewax mouth knot without auxiliary on the ceramic shell
Structure designs；
Before the ceramic shell with wax-pattern enters dewaxing process, using the sprue cup on ceramic shell as dewaxing mouth, making pottery
The outside of porcelain shell is with the mouth that dewaxes（That is sprue cup）It is in the heat resistant layer by being as thin as thick differentiation to locate to set thickness for starting point, specifically
's：Using the outside at ceramic shell dewaxing mouth as starting point, fusing point is less than after ceramic shell inside wax-pattern and burning mistake in ceramic mould
The minimum unformed fusible substance of shell outside residual ash-and preferably such as paraffin, ceramic mould is arranged on coating method after fusing
On shell, external in ceramic shell forms heat resistant layer, thickness of the heat resistant layer outside ceramic shell according to ceramic shell inside
The dewaxing rule of sequence from outside to inside of wax-pattern setting, is incrementally molded in by being as thin as thick gradual change, when coming off due to the mouth that dewaxes
Downward, i.e., heat resistant layer outside ceramic shell at dewaxing mouth is most thin, tail portion on the other side-i.e. top is then most thick, usual thermal resistance
Layer is incremented by by the 12mm gradual changes in 5mm to the thickness of thinnest part；
Ceramic shell with wax-pattern and heat resistant layer is put into steam dewaxing equipment, makes dewaxing mouth-cast gate on ceramic shell
Downward, the most thin region of heat resistant layer outside ceramic shell is in vertical bottom to cup, most thick region is in vertical the top；
Start steam dewaxing equipment to dewax with high-temperature high-pressure steam, in general, dewaxing temperature is 170 DEG C, steam pressure is
0.68Mpa, dewaxing time are 2~5 minutes；It can be seen that the fusing point of above-mentioned unformed fusible substance is less than dewaxing temperature
's；
Ceramic shell with wax-pattern and heat resistant layer is after the process that dewaxes is entered, by the heat resistant layer outside ceramic shell first
Absorb dewaxing heat（That is " material melts heat absorption " principle）, the difference based on thermal resistance layer thickness in particular directions, heat resistant layer compared with
Wax-pattern part corresponding to thin region takes the lead in melting, and the wax-pattern part corresponding to heat resistant layer thicker region is melted after then delaying, that is, is hindered
By the wax-pattern inside sequential control ceramic shell from bottom to top, from bottom to top gradual change absorbs dewaxing heat to thermosphere, makes ceramic shell
Internal wax-pattern, as fusing starting point, is dewaxed using at the mouth that dewaxes by the sequence realization from bottom to top sequence of ecto-entad；
The ceramic shell for the completion that dewaxes is put into high-temperature roasting furnace, 600~900 DEG C is heated to and heat preservation burn-up in 2~4 hours is residual
Remaining wax material, until finished product；The sprue cup of ceramic shell is sealed with clean plastic film prevents exogenous impurity from entering inside cavity, will make pottery
It is spare that porcelain shell makees cast.
Embodiment 4
Other contents of the present embodiment are identical with embodiment 1 or 2, the difference lies in：Ceramic shell to be dewaxed is other zero
Part precision-investment casting.
Embodiment 5
Other contents of the present embodiment are identical with embodiment 1,2 or 3, the difference lies in：The dewaxing difficulty position of ceramic shell
If there are one the dewaxing mouth of dewaxing mouth, auxiliary dewaxing mouth and sprue cup respectively as ceramic shell is assisted, according to above-mentioned implementation
The content of example 1,2 or 3 and corresponding heat resistant layer setting is carried out outside ceramic shell.
Embodiment 6
The present invention is the ceramic shell process for dewaxing of gas turbine turbine blade precision-investment casting, is arranged including following technique
It applies：
It makes and meets dewaxing procedure requirement, ceramic shell with wax-pattern, dewax mouth knot without auxiliary on the ceramic shell
Structure designs；
Before the ceramic shell with wax-pattern enters dewaxing process, using the sprue cup on ceramic shell as dewaxing mouth, making pottery
The outside of porcelain shell is with the mouth that dewaxes（That is sprue cup）It is in the heat resistant layer by being as thin as thick differentiation to locate to set thickness for starting point, specifically
's：Using the outside at ceramic shell dewaxing mouth as starting point, by stratiform heat-absorbing material-such as masking foil（Or aluminium-foil paper etc.）With stratiform
Package structure is arranged in outside ceramic shell, and in the heat resistant layer that the external cambial of ceramic shell is folded, the heat resistant layer is in ceramic mould
The dewaxing rule of sequence from outside to inside that thickness outside shell is set according to wax-pattern inside ceramic shell, in by being as thin as thick gradual change
Incremental molding, when coming off due to the mouth down that dewaxes, i.e., the heat resistant layer outside ceramic shell at dewaxing mouth is most thin, on the other side
Tail portion-i.e. top is then most thick, and usual heat resistant layer is incremented by by the 12mm gradual changes in 5mm to the thickness of thinnest part；Foregoing ceramic shell
The heat resistant layer of external stratiform package structure can be detachable outside ceramic shell, so that subsequent dismounting is without influencing ceramic mould
Shell thickness；
Ceramic shell with wax-pattern and heat resistant layer is put into steam dewaxing equipment, makes dewaxing mouth-cast gate on ceramic shell
Downward, the most thin region of heat resistant layer outside ceramic shell is in vertical bottom to cup, most thick region is in vertical the top；
Start steam dewaxing equipment to dewax with high-temperature high-pressure steam, in general, dewaxing temperature is 170 DEG C, steam pressure is
0.68Mpa, dewaxing time are 2~5 minutes；
Ceramic shell with wax-pattern and heat resistant layer is after the process that dewaxes is entered, by the heat resistant layer outside ceramic shell first
Absorb dewaxing heat, the difference based on thermal resistance layer thickness in particular directions, the wax-pattern part corresponding to heat resistant layer thinner region
It takes the lead in melting, the wax-pattern part corresponding to heat resistant layer thicker region is melted after then delaying, i.e., heat resistant layer is by sequence control from bottom to top
From bottom to top gradual change absorbs dewaxing heat to the wax-pattern of potting porcelain shell interior, makes the wax-pattern inside ceramic shell to make at the mouth that dewaxes
To melt starting point, dewax by the sequence realization from bottom to top sequence of ecto-entad；
After the completion of dewaxing, the stratiform heat resistant layer wrapped up outside ceramic shell is dismantled and is removed；It can be seen that above-mentioned stratiform thermal resistance
The fusing point of material is higher than dewaxing temperature；
The ceramic shell for the completion that dewaxes is put into high-temperature roasting furnace, 600~900 DEG C is heated to and heat preservation burn-up in 2~4 hours is residual
Remaining wax material, until finished product；The sprue cup of ceramic shell is sealed with clean plastic film prevents exogenous impurity from entering inside cavity, will make pottery
It is spare that porcelain shell makees cast.
Embodiment 7
The present invention is the ceramic shell process for dewaxing of gas turbine turbine blade precision-investment casting, is arranged including following technique
It applies：
It makes and meets dewaxing procedure requirement, ceramic shell with wax-pattern, dewax mouth knot without auxiliary on the ceramic shell
Structure designs；
Before the ceramic shell with wax-pattern enters dewaxing process, using the sprue cup on ceramic shell as dewaxing mouth, making pottery
The outside of porcelain shell is with the mouth that dewaxes（That is sprue cup）It is in the heat resistant layer by being as thin as thick differentiation to locate to set thickness for starting point, specifically
's：Using the outside at ceramic shell dewaxing mouth as starting point, stratiform heat-absorbing material-such as heat-insulation blanket is arranged with stratiform package structure
Outside ceramic shell, in the heat resistant layer that the external cambial of ceramic shell is folded, thickness of the heat resistant layer outside ceramic shell
According to the dewaxing rule of sequence from outside to inside of wax-pattern setting inside ceramic shell, incrementally it is molded in by being as thin as thick gradual change,
Due to the mouth down that dewaxes when coming off, i.e., heat resistant layer outside ceramic shell at dewaxing mouth is most thin, tail portion on the other side-i.e. top
Then most thick, usual heat resistant layer is incremented by by the 12mm gradual changes in 5mm to the thickness of thinnest part；Stratiform package outside foregoing ceramic shell
The heat resistant layer of structure can be detachable outside ceramic shell or can burn mistake, so that subsequent removal is without influencing ceramic shell certainly
Body thickness；
Ceramic shell with wax-pattern and heat-sink shell is put into steam dewaxing equipment, makes dewaxing mouth-cast gate on ceramic shell
Downward, the most thin region of heat resistant layer outside ceramic shell is in vertical bottom to cup, most thick region is in vertical the top；
Start steam dewaxing equipment to dewax with high-temperature high-pressure steam, in general, dewaxing temperature is 170 DEG C, steam pressure is
0.68Mpa, dewaxing time are 2~5 minutes；
Ceramic shell with wax-pattern and heat resistant layer is after dewaxing technique is entered, by the heat resistant layer outside ceramic shell first
Absorb dewaxing heat, the difference based on thermal resistance layer thickness in particular directions, the wax-pattern part corresponding to heat resistant layer thinner region
It takes the lead in melting, the wax-pattern part corresponding to heat resistant layer thicker region is melted after then delaying, i.e., heat-sink shell is by sequence control from bottom to top
From bottom to top gradual change absorbs dewaxing heat to the wax-pattern of potting porcelain shell interior, makes the wax-pattern inside ceramic shell to make at the mouth that dewaxes
To melt starting point, dewax by the sequence realization from bottom to top sequence of ecto-entad；
The ceramic shell for the completion that dewaxes is put into high-temperature roasting furnace, 600~900 DEG C is heated to and heat preservation burn-up in 2~4 hours is residual
Remaining wax material, while burn the heat resistant layer lost outside ceramic shell（It can be seen that the fusing point of above-mentioned stratiform heat resistant material is higher than dewaxing temperature
Degree）, until finished product；The sprue cup of ceramic shell is sealed with clean plastic film prevents exogenous impurity from entering inside cavity, will be ceramic
It is spare that shell makees cast.
The above various embodiments is only to illustrate the present invention, rather than its limitations；Although with reference to the various embodiments described above to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：The present invention still can be to the various embodiments described above
In specific technical solution modify either to which part technical characteristic carry out equivalent replacement and these modification or replace
It changes, the spirit and scope of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of ceramic shell process for dewaxing, which is characterized in that the process for dewaxing includes following technological measure：
Before the ceramic shell with wax-pattern enters dewaxing process, to be set at the mouth that dewaxes for starting point outside the ceramic shell
Thickness is in the heat resistant layer by being as thin as thick differentiation；
Ceramic shell with wax-pattern and heat resistant layer is put into dewaxing device, makes the dewaxing mouth down on ceramic shell, ceramics
The most thin region of heat resistant layer outside shell is in vertical bottom, most thick region is in vertical the top；
Ceramic shell with wax-pattern and heat resistant layer enters after dewaxing process, is pressed under by the heat resistant layer outside ceramic shell
Wax-pattern gradual change inside sequential control ceramic shell on and absorbs dewaxing heat, makes the wax-pattern inside ceramic shell with the mouth that dewaxes
Place dewaxes as fusing starting point by the sequence realization from bottom to top sequence of ecto-entad.
2. ceramic shell process for dewaxing according to claim 1, which is characterized in that thermal resistance set by outside the ceramic shell
The thickness of layer, according to the dewaxing rule of sequence from low to uper part from outside to inside of wax-pattern setting inside ceramic shell, in by being as thin as thickness
Gradual change be incremented by.
3. ceramic shell process for dewaxing according to claim 1 or claim 2, which is characterized in that the thermal resistance outside the ceramic shell
For layer for unformed fusible substance, the unformed fusible substance is to paste, is arranged in ceramic mould in a manner of viscous leaching or coating
Outside shell；The fusing point of the unformed fusible substance is less than dewaxing temperature, and the fusible substance can be in ceramic shell
Melted outside is burnt and is lost.
4. ceramic shell process for dewaxing according to claim 3, which is characterized in that the unformed fusible substance includes stone
Wax or microwax.
5. ceramic shell process for dewaxing according to claim 1 or claim 2, which is characterized in that the thermal resistance outside the ceramic shell
Layer is stratiform heat resistant material, and layered heat resistant material is arranged in stratiform package structure outside ceramic shell；Layered resistance
The fusing point of hot material is higher than dewaxing temperature, and mistake outside ceramic shell can be dismantled and/or be burnt to layered heat resistant material.
6. ceramic shell process for dewaxing according to claim 5, which is characterized in that layered heat resistant material includes heat-insulated
Blanket, masking foil and/or aluminium-foil paper.
7. ceramic shell process for dewaxing according to claim 1, which is characterized in that nothing outside the dewaxing mouth of the ceramic shell
Heat resistant layer.
8. according to the ceramic shell process for dewaxing of claim 1 or 7, which is characterized in that the dewaxing mouth on the ceramic shell
For sprue cup.
9. ceramic shell process for dewaxing according to claim 1, which is characterized in that the ceramic shell is gas turbine turbine
Blade or the ceramic shell of aero engine turbine blades precision-investment casting.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168184A (en) * | 2006-10-26 | 2008-04-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Casting method for heavy combustion engine II-stage diverter blade |
| CN106853508A (en) * | 2017-02-27 | 2017-06-16 | 东方电气集团东方汽轮机有限公司 | A kind of method for preventing ceramic shell cracking |
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2017
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101168184A (en) * | 2006-10-26 | 2008-04-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Casting method for heavy combustion engine II-stage diverter blade |
| CN106853508A (en) * | 2017-02-27 | 2017-06-16 | 东方电气集团东方汽轮机有限公司 | A kind of method for preventing ceramic shell cracking |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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