CN106392004B - The wall thickness control method of hollow blade with blind hole inner cavity - Google Patents
The wall thickness control method of hollow blade with blind hole inner cavity Download PDFInfo
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- CN106392004B CN106392004B CN201611033708.2A CN201611033708A CN106392004B CN 106392004 B CN106392004 B CN 106392004B CN 201611033708 A CN201611033708 A CN 201611033708A CN 106392004 B CN106392004 B CN 106392004B
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- wax
- pattern
- hole
- type core
- hollow blade
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- 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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- 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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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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 wall thickness control methods of hollow blade with blind hole inner cavity, comprising the following steps: a, the design by opening up hole in wax-pattern, so that type core cantilever end is exposed；B, by the matched design of mold inner-cavity and the hole of wax-pattern, with the positioning of realization type core and shaping investment pattern；C, after wax-pattern preparation, the hole of the wax-pattern of type core cantilever end is obturaged, to form the stable wax-pattern with accurate hollow blade of wall thickness dimension.The structure design to be matched by the aperture in the aperture design and mold of wax-pattern with wax-pattern, with the position of fixed core, avoids the swing at wax-pattern pressing process medium-sized core suspended wall end, can control blade wall thickness dimensional accuracy and consistency.The blade of hollow blade does not need penetrability supporting point, and blade surface is complete.It is adapted to the hot investment casting of the various hollow blades that can not be fixed with blind hole.
Description
Technical field
The present invention relates to aero-engine hollow blade precision casting technology fields, particularly, are related to a kind of with blind hole
The wall thickness control method of the hollow blade of inner cavity.
Background technique
In aircraft engine parts hot investment casting field, the inner cavity of hollow blade is formed by type core, there is a kind of sky
The inner cavity of lobus cardiacus piece is blind-hole type, and inner cavity only has open at one end, and the other end is closed.This blade is preparing wax-pattern
When, type core can extend a core print in open end and contact with mold, and closed end be then it is hanging, it is contactless with mold,
Type core is suspended wall type core.It needs to stay certain gap (0.05-0.1mm) when matching due to core print with mold, so type core is in mould
There is certain activity in tool, off-chip head is remoter, and the activity of type core is bigger.Swing of the type core at suspended wall end (reaches greatly very much
0.5mm), easily cause wall thickness dimension overproof.
Summary of the invention
The present invention provides a kind of wall thickness control methods of hollow blade with blind hole inner cavity, above-mentioned hollow to solve tool
Blade is difficult to ensure the stabilization and accurate technical problem of blade wall thickness size in wax-pattern preparatory phase.
The present invention provides a kind of wall thickness control method of hollow blade with blind hole inner cavity, comprising the following steps: a, leads to
It crosses and opens up the design of hole in wax-pattern, so that type core cantilever end is exposed；B, it is set by the matching of mold inner-cavity and the hole of wax-pattern
Meter, with the positioning of realization type core and shaping investment pattern；C, after wax-pattern preparation, the hole of the wax-pattern of type core cantilever end is obturaged, to form wall
The wax-pattern of thick dimensionally stable and accurate hollow blade.
Further, step a specifically: the blind hole end of Hollow Blade Wax patterns is designed to that removal part wax material forms a hole
Structure so that type core suspended wall end part is exposed；Hole is located at the lower section of type core suspended wall end gravity direction.
Further, a step is arranged at hole bottom, exists and type core wheel between the wax material below step and the core print of type core
Wide similar imitation-shaped groove, step protrude outward and exceed the exposed face of type core.
Further, also there is a wax stone outstanding, the shape of wax stone and the cavity shape of hole are consistent, use on wax-pattern
In fill up hole and obturage suspended wall end type core core print.
Further, step b specifically: mold inner-cavity is equipped with the boss for being used to form the hole of wax-pattern and for forming
The forming cavity of wax stone.
Further, boss front end geometry is corresponding with the combined shaped of the imitation-shaped groove of the hole bottom of design and step,
Positioning mechanism of the boss front end as type core suspended wall end；When preparing wax-pattern, the boss front end encirclement type core suspended wall end bottom of mold,
To prevent type core from being fallen and being prevented type core or so play by gravity.
Further, step c specifically: with the pressed wax-pattern of mold have hole and wax stone, hole cavity shape with
The wax stone shape increased in advance is consistent；It pulls lower wax stone and fills in hole, fill up gap with liquid drop wax and carry out the reparation of junction, to obtain
Obtain the complete wax-pattern in surface.
Further, the step of a protruding type core suspended wall end exposed face, wax stone bottom surface and platform when obturaging are reserved in hole bottom
Rank surface contact, to improve assembly precision.
Further, there is circumferentially distributed preset clearance, preset clearance width is 0.05mm- between wax stone and hole
0.15mm, in order to which wax stone is put into hole.
Further, the selection of hole aperture position is on the face that wax-pattern has machining allowance；After obturaging, wax stone and hole
Even if out-of-flatness nor affects on the size after processing between.
The invention has the following advantages:
The wall thickness control method of hollow blade with blind hole inner cavity, by the aperture design and mold of wax-pattern with wax
The structure design that the aperture of mould matches, with the position of fixed core, avoids the swing at wax-pattern pressing process medium-sized core suspended wall end,
Blade wall thickness dimensional accuracy and consistency can be controlled.The blade of hollow blade does not need penetrability supporting point, and blade surface is complete
It is whole.It is adapted to the hot investment casting of the various hollow blades that can not be fixed with blind hole.
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 implementation steps of the wall thickness control method of the hollow blade with blind hole inner cavity of the preferred embodiment of the present invention
Block diagram；
Fig. 2 is the structural schematic diagram of the wax-pattern with hole of the preferred embodiment of the present invention；
Fig. 3 is the type core of the preferred embodiment of the present invention and the assembling fixed structure schematic diagram of mold；
Fig. 4 is the type core of the preferred embodiment of the present invention and the schematic diagram of the section structure of mold package assembly；
Fig. 5 is the partial structural diagram after the wax-pattern of the preferred embodiment of the present invention is assembled；
Fig. 6 is the structural schematic diagram at the hole position of the wax-pattern of the preferred embodiment of the present invention；
Fig. 7 is the structural schematic diagram of the mold of the preferred embodiment of the present invention；
Fig. 8 is the structural schematic diagram of the wax-pattern with wax stone of the preferred embodiment of the present invention；
Fig. 9 is the structural schematic diagram of the wax-pattern after the assembly of the preferred embodiment of the present invention.
Marginal data:
1, wax-pattern；101, hole；1011, step；1012, imitation-shaped groove；102, wax stone；2, type core；3, mold；301, convex
Platform；302, forming cavity.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be limited by following and
The multitude of different ways of covering is implemented.
Fig. 1 is the implementation steps of the wall thickness control method of the hollow blade with blind hole inner cavity of the preferred embodiment of the present invention
Block diagram；Fig. 2 is the wax-pattern structural schematic diagram with hole of the preferred embodiment of the present invention；Fig. 3 is the type of the preferred embodiment of the present invention
The assembling fixed structure schematic diagram of core and mold；Fig. 4 is the type core of the preferred embodiment of the present invention and the section of mold package assembly
Structural schematic diagram；Fig. 5 is the partial structural diagram after the wax-pattern of the preferred embodiment of the present invention is assembled；Fig. 6 is of the invention preferred
The structural schematic diagram at the hole position of the wax-pattern of embodiment；Fig. 7 is the structural schematic diagram of the mold of the preferred embodiment of the present invention；Figure
8 be the structural schematic diagram of the wax-pattern with wax stone of the preferred embodiment of the present invention；After Fig. 9 is the assembly of the preferred embodiment of the present invention
The structural schematic diagram of wax-pattern.
As shown in Figure 1, the wall thickness control method of the hollow blade with blind hole inner cavity of the present embodiment, including following step
It is rapid: a, the design by opening up hole 101 in wax-pattern 1, so that 2 cantilever end of type core is exposed；B, pass through 3 inner cavity of mold and wax-pattern 1
Hole 101 matched design, with realization type core 2 positioning and wax-pattern 1 form；C, after prepared by wax-pattern 1,2 cantilever end of type core is obturaged
Wax-pattern 1 hole 101, to be formed, wall thickness dimension is stable and the wax-pattern 1 of accurate hollow blade.It is set by the aperture of wax-pattern 1
The structure to match on meter and mold 3 with the aperture of wax-pattern 1 designs, and with the position of fixed core 2, wax-pattern 1 is avoided to suppress
The swing at the medium-sized 2 suspended wall end of core of journey, can control blade wall thickness dimensional accuracy and consistency.The blade of hollow blade does not need to wear
Permeability supporting point, blade surface are complete.It is adapted to the hot investment casting of the various hollow blades that can not be fixed with blind hole.
As shown in Fig. 2, in the present embodiment, step a specifically: the blind hole end of Hollow Blade Wax patterns is designed to removal part wax
Material forms the structure of a hole 101, so that 2 suspended wall end part of type core is exposed.Hole 101 is located at 2 suspended wall end gravity direction of type core
Lower section.It is convenient that type core 2 is supported and is positioned by hole 101, avoid the medium-sized 2 suspended wall end of core of 1 pressing process of wax-pattern
It swings, blade wall thickness dimensional accuracy and consistency can be controlled.
As shown in Figure 5 and Figure 6, in the present embodiment, a step 1011 is arranged at 101 bottom of hole.The wax material of 1011 lower section of step
There is imitation-shaped groove 1012 similar with 2 profile of type core between the core print of type core 2.Step 1011 protrudes outward and beyond type core 2
Exposed face.
As shown in figure 8, in the present embodiment also there is a wax stone 102 outstanding on wax-pattern 1.The shape of wax stone 102 and hole
The cavity shape in hole 101 is consistent, for fill up hole 101 and obturage suspended wall end type core 2 core print.
As shown in Fig. 3, Fig. 4 and Fig. 7, in the present embodiment, step b specifically: 3 inner cavity of mold is equipped with and is used to form wax-pattern 1
Hole 101 boss 301 and forming cavity 302 for forming wax stone 102.
As shown in Fig. 3, Fig. 4, Fig. 6 and Fig. 7, in the present embodiment, 101 bottom of hole of 301 front end geometry of boss and design
Imitation-shaped groove 1012 and step 1011 combined shaped it is corresponding.Positioning mechanism of 301 front end of boss as 2 suspended wall end of type core.
When preparing wax-pattern 1,301 front end encirclement type core of boss, the 2 suspended wall end bottom of mold 3, with prevent type core 2 by gravity fall with
And prevent 2 or so play of type core.
As shown in Fig. 6, Fig. 8 and Fig. 9, in the present embodiment, step c specifically: there is hole with the pressed wax-pattern 1 of mold 3
Hole 101 and wax stone 102,101 cavity shape of hole are consistent with 102 shape of wax stone increased in advance.It pulls lower wax stone 102 and fills in hole 101,
Gap is filled up with liquid drop wax and carries out the reparation of junction, to obtain the complete wax-pattern 1 in surface.
As shown in Fig. 5, Fig. 6 and Fig. 9, in the present embodiment, 2 suspended wall end exposed face of a protruding type core is reserved in 101 bottom of hole
Step 1011.102 bottom surface of wax stone is contacted with 1011 surface of step when obturaging, to improve assembly precision.
As shown in figs. 5 and 9, in the present embodiment, between wax stone 102 and hole 101 with it is circumferentially distributed it is reserved between
Gap, in order to which wax stone 102 is put into hole 101.Preset clearance width is 0.05mm-0.15mm, in order to which wax stone 102 is put into hole
In hole 101.
As shown in figure 9, the selection of 101 aperture position of hole is on the face that wax-pattern 1 has machining allowance in the present embodiment.Envelope
After tight, even if out-of-flatness nor affects on the size after processing between wax stone 102 and hole 101.
When implementation, a kind of wall thickness control method of hollow blade with blind hole inner cavity is provided.Including three steps: passing through
Wax-pattern configuration design makes type core suspended wall end is exposed, realizes shaping investment pattern and type core by mold design position, seal after wax-pattern preparation
Tight type core suspended wall end.
A. wax-pattern designs: blade blind hole end removes part wax material and forms a hole, keeps type core suspended wall end part exposed.Hole
Positioned at the lower section of type core suspended wall end gravity direction, as shown in Figure 2.
Porous Characteristic: a step is arranged at bottom, exists between the wax material and core print below step similar with type core profile imitative
Shape slot, step are higher than type core bottom surface, as shown in Figure 5,6.Other proper sites have a wax stone, the shape and hole one of wax stone
It causes, obturages suspended wall end core print for filling up hole, as shown in Figure 8.
B. mold design: for mould appearance as shown in fig. 7, compared with general mold, this mold, which exists, is used to form above-mentioned wax
The boss in die hole hole and for forming small wax stone cavity, is used to form the boss of above-mentioned wax-pattern hole, such as Fig. 2, Fig. 5, Fig. 8 institute
Show.The boss front end geometry of mold is corresponding with the imitation-shaped groove of wax-pattern hole bottom and step, as shown in Fig. 3, Fig. 4, Fig. 7.
Boss front end can be used as the positioning mechanism at type core suspended wall end, and as shown in Figure 3, Figure 4, boss front end encloses suspended wall
End type core bottom, can prevent type core from being fallen by gravity, can also prevent type core or so play, and open end uses conventional method
Positioning is contacted with mold, type core in a mold just can stable position.
C. suspended wall core print is obturaged.With the pressed wax-pattern of the mold, there are hole and small wax stone, cavity shape and in advance increasings
Wax stone shape it is consistent, pull lower wax stone and fill in hole, fill up gap with liquid drop wax and suitably to repair available surface complete
Wax-pattern.
As previously mentioned, a step for being higher than type core suspended wall end bottom surface, wax stone bottom surface and hole when obturaging have been reserved in hole bottom
Assembly precision can be improved in hole step face contact.Wax stone preset clearance 0.1mm or so (preset clearance 0.05mm between week and hole
~0.15mm), make wax stone convenient for being put into hole, as shown in Figure 5.Hole aperture position selects on the face for having machining allowance,
Even if out-of-flatness nor affects on the size after processing between wax stone and hole after obturaging.
The present invention have blind hole inner cavity hollow blade wall thickness control method the utility model has the advantages that
(1) avoids the swing at type core suspended wall end, controls blade wall thickness dimensional accuracy and consistency.
(2) for compared with existing method, blade of the present invention does not need penetrability supporting point, and blade surface is complete
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 (7)
1. a kind of wall thickness control method of the hollow blade with blind hole inner cavity, when preparing wax-pattern, type core (2) exists hollow blade
The open end of hollow blade blind hole inner cavity is extended a core print and is contacted with mold (3), and type core (2) is in hollow blade blind hole
The closed end of chamber be then it is hanging, it is contactless with mold (3), type core (2) be suspended wall type core；
It is characterized in that,
The following steps are included:
A, by opening up the design of hole (101) in wax-pattern (1), so that type core (2) cantilever end is exposed；
Step a specifically: the blind hole end of Hollow Blade Wax patterns is designed to that removal part wax material forms the structure of a hole (101),
So that type core (2) suspended wall end part is exposed, hole (101) is located at the lower section of type core (2) suspended wall end gravity direction, so as to through hole
Hole (101) is supported and positions to type core (2), avoids the swing at wax-pattern (1) pressing process medium-sized core (2) suspended wall end, thus
Control blade wall thickness dimensional accuracy and consistency；
B, by the matched design of mold (3) inner cavity and the described hole (101) of the wax-pattern (1), to realize the type core (2)
Positioning and the wax-pattern (1) molding；
Step b specifically: mold (3) inner cavity is equipped with the boss (301) for being used to form the hole (101) of wax-pattern (1) and is used for
Form the forming cavity (302) of wax stone (102)；
C, after wax-pattern (1) preparation, the described hole (101) of the wax-pattern (1) of type core (2) cantilever end is obturaged, with
Form the stable wax-pattern (1) with accurate hollow blade of wall thickness dimension；
Step c specifically: there is hole (101) and wax stone (102) with mold (3) pressed wax-pattern (1), hole (101) is empty
Chamber shape is consistent with wax stone (102) shape increased in advance, pulls lower wax stone (102) and fills in hole (101), fills up gap with liquid drop wax
And the reparation of junction is carried out, to obtain the complete wax-pattern in surface (1).
2. hollow blade wall thickness control method according to claim 1, which is characterized in that
One step (1011) are arranged at described hole (101) bottom,
Exist between wax material and the core print of the type core (2) below the step (1011) similar to type core (2) profile
Imitation-shaped groove (1012),
The step (1011) protrudes outward and exceeds the exposed face of the type core (2).
3. hollow blade wall thickness control method according to claim 2, which is characterized in that
Also there is a wax stone (102) outstanding on the wax-pattern (1),
The shape of the wax stone (102) is consistent with the cavity shape of hole (101), for filling up described hole (101) and obturaging
The core print of the type core (2) at suspended wall end.
4. hollow blade wall thickness control method according to claim 1, which is characterized in that
The imitation-shaped groove (1012) and step (1011) of described hole (101) bottom of boss (301) front end geometry and design
Combined shaped it is corresponding,
Positioning mechanism of boss (301) front end as type core (2) the suspended wall end；
When preparing the wax-pattern (1), the boss (301) front end of the mold (3) surrounds type core (2) the suspended wall end bottom
Portion, to prevent the type core (2) from being fallen and being prevented type core (2) left and right play by gravity.
5. hollow blade wall thickness control method according to claim 1, which is characterized in that
The step (1011) of prominent type core (2) the suspended wall end exposed face in described hole (101) bottom reserved one, when obturaging described in
Wax stone (102) bottom surface is contacted with the step (1011) surface, to improve assembly precision.
6. hollow blade wall thickness control method according to claim 5, which is characterized in that
There is circumferentially distributed preset clearance, the preset clearance width between the wax stone (102) and described hole (101)
For 0.05mm-0.15mm, in order to which wax stone (102) is put into hole (101).
7. hollow blade wall thickness control method according to claim 5, which is characterized in that
The selection of described hole (101) aperture position is on the face that the wax-pattern (1) has machining allowance；
After obturaging, the wax stone (102) and described hole (101) even if between out-of-flatness nor affect on the size after processing.
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| CN201611033708.2A CN106392004B (en) | 2016-11-22 | 2016-11-22 | The wall thickness control method of hollow blade with blind hole inner cavity |
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| CN201611033708.2A CN106392004B (en) | 2016-11-22 | 2016-11-22 | The wall thickness control method of hollow blade with blind hole inner cavity |
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| CN106392004B true CN106392004B (en) | 2019-07-02 |
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| CN112338139A (en) * | 2020-10-16 | 2021-02-09 | 中国航发北京航空材料研究院 | Cold wax block for controlling thickness of tenon tooth wall of hollow turbine working blade and casting method implemented by cold wax block |
| CN114406190A (en) * | 2021-12-28 | 2022-04-29 | 东营一诚精密金属有限公司 | Process method for ensuring coaxiality of investment casting blind holes |
| CN115401167A (en) * | 2022-08-31 | 2022-11-29 | 贵州安吉航空精密铸造有限责任公司 | Casting forming method for casting with complex blind cavity structure |
| 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 |
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