阅读说明：本技术 排气整流器整体蜡模压型模具 (Integral wax mould pressing type mould of exhaust rectifier ) 是由 黄英 贺颖茜 李子林 尹高平 于 2021-07-22 设计创作，主要内容包括：本发明提供了一种排气整流器整体蜡模压型模具,包括：模具底座的顶部对称设置有两个弧形模具支撑座,弧形模具支撑座上设置有模具底板,弧形模具支撑座与模具底板间设置有外模驱动机构,模具底板中部设置有内模芯,内模芯设置有型芯安装槽,模具底板环绕内模芯设置有多个内模插槽,型芯通过型芯托具安装在型芯安装槽上；内模结构设置有多个内模块组,外模结构设置有多个外模块,导料板设置在外模结构和内模结构顶部,导料板底部固定设置有外模环套,盖板设置在所述导料板的顶部,盖板和导料板之间设置有注料口。本发明结构设计合理,脱模过程流畅,注料融解填充料腔充分,能够一次令蜡模的内外叶片成型,并且脱模过程不会对蜡模精度造成影响。(The invention provides an integral wax mould pressing type mould of an exhaust rectifier, which comprises: the top of the mold base is symmetrically provided with two arc-shaped mold supporting seats, a mold bottom plate is arranged on each arc-shaped mold supporting seat, an outer mold driving mechanism is arranged between each arc-shaped mold supporting seat and the mold bottom plate, an inner mold core is arranged in the middle of the mold bottom plate, the inner mold core is provided with a mold core mounting groove, the mold bottom plate is provided with a plurality of inner mold slots surrounding the inner mold core, and the mold core is mounted on the mold core mounting groove through a mold core support; the centre form structure is provided with a plurality of centre form block groups, and the external mold structure is provided with a plurality of outer modules, and the stock guide setting is at external mold structure and centre form structure top, and the fixed external mold ring cover that is provided with in stock guide bottom, the apron setting is in the top of stock guide is provided with the sprue between apron and the stock guide. The invention has reasonable structural design, smooth demolding process, sufficient cavity for melting and filling materials by injecting materials, capability of molding the inner and outer blades of the wax mold at one time, and no influence on the accuracy of the wax mold in the demolding process.)

1. The utility model provides an integral wax mould pressing type mould of exhaust rectifier which characterized in that includes:

the die comprises a die base, wherein two arc-shaped die supporting seats are symmetrically arranged on the outer edge of the top of the die base, a die bottom plate is arranged on each arc-shaped die supporting seat, an outer die driving mechanism is arranged between each arc-shaped die supporting seat and the die bottom plate, an inner die core is arranged in the middle of the die bottom plate, a die core mounting groove is formed in the bottom of the inner die core in an outward extending mode, the die bottom plate is provided with a plurality of inner die slots surrounding the inner die core, a plurality of guide grooves are formed in the die bottom plate above the outer die driving mechanism, and the guide grooves are distributed in a radial mode;

the mold core is arranged on the mold core mounting groove through a mold core support;

the inner die structure is provided with a plurality of inner die block groups, the inner die block groups are closely and annularly arranged on the die bottom plate, each inner die block group comprises a first small inner die block, a second small inner die block and a big inner die block, the first small inner die block and the second small inner die block are closely arranged on two sides of the big inner die block, an inner die insert block is arranged at the bottom of the big inner die block, and the inner die insert block is used for being inserted into the inner die insert slot;

the outer mold structure is provided with a plurality of outer modules, and the outer modules are arranged on the guide grooves in a sliding manner;

the material guide plate is arranged at the tops of the outer mold structure and the inner mold structure, a plurality of material guide holes are formed in the material guide plate and communicated with a material cavity of a mold, an outer mold ring sleeve is fixedly arranged at the bottom of the material guide plate and used for being tightly sleeved on the outer side of the outer mold structure;

the cover plate is arranged at the top of the material guide plate, and a filling port is arranged between the cover plate and the material guide plate.

2. The exhaust gas rectifier integral wax die-pressing type mold according to claim 1, further comprising: the die lifting plate is arranged inside the arc-shaped die supporting seat, a plurality of die lifting grooves are uniformly formed in the die core mounting groove, a die lifting module is movably inserted into each die lifting groove, and the die lifting plate is used for jacking the die lifting module from the bottom.

3. The exhaust gas rectifier integral wax mould pressing type mould according to claim 2, wherein the two sides of the stripping plate are provided with stripping lifting plates, the stripping lifting plates are arranged in the gap between the two arc-shaped mould supporting seats, the stripping lifting plates are provided with lifting operation holes, the two sides of the mould base are provided with stepped lifting blocks, and the lifting blocks are arranged in the lifting operation holes in a penetrating mode.

4. The integral wax die pressing type die for the exhaust rectifier according to claim 2, wherein the lift plate is provided with lightening holes.

5. The integral wax die pressing type mold for the exhaust gas rectifier according to claim 1, wherein the outer mold driving mechanism is provided with an annular driving plate, an arc-shaped driving groove is formed in the annular driving plate, a driving block is arranged at the bottom of each outer module, a driving column is arranged at the bottom of the driving block, a U-shaped hole is formed in the guiding groove, the outer modules are slidably arranged in the guiding groove through the driving blocks, and the driving column is slidably arranged in the arc-shaped driving groove through the U-shaped hole.

6. The exhaust gas rectifier integral wax die-pressing type mold as claimed in claim 5, wherein a driving rod is provided to a side of the ring-shaped driving plate.

7. The integral wax die pressing type mold for the exhaust gas rectifier according to claim 1, wherein a first blade-shaped groove is formed in one side of the first small inner mold block, and a second blade-shaped groove is formed in one side of the second small inner mold block.

8. The integral wax die pressing type mold for the exhaust gas rectifier according to claim 1, wherein the top of the first small inner mold block, the top of the second small inner mold block and the top of the large inner mold block are provided with operation holes.

9. The exhaust gas rectifier integral wax die pressing type mold according to claim 1, wherein a side surface of the cover plate is provided with a cover plate handle, and a side surface of the mold base plate is provided with a mold base plate handle.

10. The integral wax die pressing type die for the exhaust rectifier according to claim 1, wherein a material guide groove is formed in the bottom surface of the cover plate, and the material guide groove is respectively communicated with the material injection port and the material guide hole.

Technical Field

The invention relates to the field of precision casting of aero-engines, in particular to an integral wax mould pressing type mould of an exhaust rectifier.

Background

The precision casting is a general term of a process for obtaining a precise casting by using a precision molding method, and compared with the traditional sand casting process, the precision casting has the advantages that the size of the casting obtained by precision casting is more accurate, the surface smoothness is better, and the precision casting comprises investment casting, ceramic mold casting, metal mold casting, pressure casting and lost foam casting. Precision casting is a common part manufacturing process in the field of aviation.

The aircraft engine is provided with an exhaust system, the exhaust system needs to discharge gas exhausted by a turbine into the atmosphere at a certain speed and in a required direction so as to generate thrust, therefore, a rectifying device is usually arranged at the tail end of the aircraft engine to rectify the exhausted gas, and the quality of rectification directly influences the overall quality of the aircraft engine. Because the structure of the rectifier of the aero-engine is complex, the rectifier is provided with an inner ring blade and an outer ring blade, an inner ring core of the rectifier needs to be cast in advance, and a rectifier wax mold is further cast by matching a core with a mold; the existing wax mould pressing mould has the problem of difficult material injection and filling, and meanwhile, because the wax mould is soft in texture, the conventional demoulding mode can hardly ensure that the wax mould has enough precision and integral structural integrity during demoulding.

Disclosure of Invention

The invention provides an integral wax mould pressing mould of an exhaust rectifier, and aims to solve the problems that the existing wax mould pressing mould is difficult to fill materials, and the quality and soft demoulding of a wax mould easily influence the precision and the integrity.

In order to achieve the above object, an embodiment of the present invention provides an exhaust rectifier integral wax molding type mold, including:

the die comprises a die base, wherein two arc-shaped die supporting seats are symmetrically arranged on the outer edge of the top of the die base, a die bottom plate is arranged on each arc-shaped die supporting seat, an outer die driving mechanism is arranged between each arc-shaped die supporting seat and the die bottom plate, an inner die core is arranged in the middle of the die bottom plate, a die core mounting groove is formed in the bottom of the inner die core in an outward extending mode, the die bottom plate is provided with a plurality of inner die slots surrounding the inner die core, a plurality of guide grooves are formed in the die bottom plate above the outer die driving mechanism, and the guide grooves are distributed in a radial mode;

the mold core is arranged on the mold core mounting groove through a mold core support;

the inner die structure is provided with a plurality of inner die block groups, the inner die block groups are closely and annularly arranged on the die bottom plate, each inner die block group comprises a first small inner die block, a second small inner die block and a big inner die block, the first small inner die block and the second small inner die block are closely arranged on two sides of the big inner die block, an inner die insert block is arranged at the bottom of the big inner die block, and the inner die insert block is used for being inserted into the inner die insert slot;

the outer mold structure is provided with a plurality of outer modules, and the outer modules are arranged on the guide grooves in a sliding manner;

the material guide plate is arranged at the tops of the outer mold structure and the inner mold structure, a plurality of material guide holes are formed in the material guide plate and communicated with a material cavity of a mold, an outer mold ring sleeve is fixedly arranged at the bottom of the material guide plate and used for being tightly sleeved on the outer side of the outer mold structure;

the cover plate is arranged at the top of the material guide plate, and a filling port is arranged between the cover plate and the material guide plate.

Wherein, still include: the die lifting plate is arranged inside the arc-shaped die supporting seat, a plurality of die lifting grooves are uniformly formed in the die core mounting groove, a die lifting module is movably inserted into each die lifting groove, and the die lifting plate is used for jacking the die lifting module from the bottom.

The mold lifting device comprises a mold lifting plate, a mold lifting operation hole, stepped lifting blocks and a mold base, wherein the mold lifting plate is arranged on two sides of the mold lifting plate and is arranged in a gap between two arc-shaped mold supporting seats, the mold lifting operation hole is formed in the mold lifting plate, the stepped lifting blocks are arranged on two sides of the mold base, and the lifting blocks are arranged in the lifting operation hole in a penetrating mode.

Wherein, the lifting template is provided with lightening holes.

The outer die driving mechanism is provided with an annular driving plate, an arc-shaped driving groove is formed in the annular driving plate, a driving block is arranged at the bottom of each outer module, a driving column is arranged at the bottom of each driving block, a U-shaped hole is formed in each guiding groove, the outer modules are slidably arranged in the guiding grooves through the driving blocks, and the driving columns penetrate through the U-shaped holes and are slidably arranged in the arc-shaped driving grooves.

Wherein, the side of annular drive plate is provided with the actuating lever.

A first blade type groove is formed in one side of the first small inner module, and a second blade type groove is formed in one side of the second small inner module.

And the top parts of the first small inner module, the second small inner module and the big inner module are provided with operation holes.

The side of the cover plate is provided with a cover plate handle, and the side of the die bottom plate is provided with a die bottom plate handle.

The bottom surface of the cover plate is provided with a guide chute, and the guide chute is respectively communicated with the injection port and the guide hole.

The scheme of the invention has the following beneficial effects:

the integral wax mould pressing type mould of the exhaust rectifier in the embodiment of the invention bears the whole mould structure through the mould base; after the material is injected into the mold through the material injection port, the material can rapidly flow into the material guide holes from the material guide groove so as to fill the material cavity, and after the material is cooled, the mold is demoulded; the outer module is installed on an outer die driving mechanism through a driving block, the driving block can slide along a guide groove of a die bottom plate, a driving column at the bottom of the driving block can slide along an arc-shaped driving groove of an annular driving plate, the annular driving plate can rotate by pulling a driving rod, and the outer module radially slides along the guide groove through the matching of the arc-shaped driving groove and the guide groove to complete demolding; the centre form structure is provided with a plurality of centre form block groups, and module group is provided with module in first little, big interior module and the little interior module of second in every, and the blade type groove of seting up on module in adjacent first little and the little interior module of second can form the big blade of the whole wax matrix of rectifier, and the core can form the vanelet of the whole wax matrix of rectifier, promotes the mould and lifts the board, can accomplish the drawing of the whole wax matrix of rectifier through jacking drawing the module. The invention has reasonable structural design, smooth demolding process, sufficient cavity for melting and filling materials by injecting materials, capability of molding the inner and outer blades of the wax mold at one time, and no influence on the accuracy of the wax mold in the demolding process.

Drawings

Fig. 1 is a schematic structural view of an integral wax-molded type mold for an exhaust rectifier according to the present invention;

FIG. 2 is a schematic view of a cover-less structure of the integral wax-molded mold for an exhaust rectifier according to the present invention;

FIG. 3 is a schematic view of a structure of a material guiding plate-free mold of the exhaust rectifier integral wax mold pressing type of the present invention;

FIG. 4 is a schematic structural diagram of an inner module of the integral wax-molded mold of the exhaust rectifier according to the present invention;

FIG. 5 is a schematic view of the core and mold base of the exhaust gas rectifier integral wax molded mold of the present invention;

FIG. 6 is a schematic view of the exhaust rectifier integral wax molded mold core carrier and mold base of the present invention;

FIG. 7 is a schematic view of an outer mold driving structure and a mold stripping mechanism of the integral wax mold pressing type mold of the exhaust rectifier according to the present invention;

FIG. 8 is a schematic view of the ejection mechanism of the integral wax die-molding type mold for an exhaust rectifier according to the present invention;

FIG. 9 is a schematic view of a mold base and an arc-shaped mold supporting seat of the integral wax mold pressing type mold of the exhaust rectifier according to the present invention;

fig. 10 is a bottom view of a cover plate of the exhaust rectifier integral wax molding type mold of the present invention;

FIG. 11 is a schematic view of a belt core wax mold of the exhaust gas rectifier integral wax mold press type mold of the present invention;

fig. 12 is a schematic view of a coreless wax pattern of the exhaust rectifier integral wax pattern molding die of the present invention.

[ description of reference ]

1-a mould base; 2-arc mould supporting seat; 3-a mould bottom plate; 4-inner mold core; 5-core mounting groove; 6-inner mould slot; 7-a guide groove; 8-outer mold limiting ring; 9-a mold core; 10-a core holder; 11-a first small inner module; 12-a second small inner module; 13-large inner module; 14-inner mold insert; 15-an outer module; 16-a material guide plate; 17-material guiding holes; 18-outer mold ring sleeve; 19-a cover plate; 20-an injection port; 21-stripping a template; 22-start module; 23-stripping and lifting the plate; 24-a lifting block; 25-lightening holes; 26-an annular drive plate; 27-arc drive slot; 28-a drive block; 29-a drive column; 30-U-shaped holes; 31-a drive rod; 32-a first blade-shaped groove; 33-second blade type groove; 34-an operation hole; 35-a lid handle; 36-mold bottom plate handle; 37-guide chute.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides an integral wax mould pressing mould of an exhaust rectifier, aiming at the problems that the material injection and filling of the existing wax mould pressing mould are difficult, and the precision and the integrity of the wax mould are easily influenced by soft demoulding of the wax mould.

As shown in fig. 1 to 9, an embodiment of the present invention provides an exhaust rectifier integral wax molding type mold including: the mold comprises a mold base 1, wherein two arc-shaped mold supporting seats 2 are symmetrically arranged on the outer edge of the top of the mold base 1, a mold bottom plate 3 is arranged on each arc-shaped mold supporting seat 2, an outer mold driving mechanism is arranged between each arc-shaped mold supporting seat 2 and the mold bottom plate 3, an inner mold core 4 is arranged in the middle of each mold bottom plate 3, a mold core mounting groove 5 is formed in the bottom of each inner mold core 4 in an outward extending mode, a plurality of inner mold slots 6 are formed in the mold bottom plate 3 around the inner mold cores 4, a plurality of guide grooves 7 are formed in the mold bottom plate 3 above the outer mold driving mechanism, the guide grooves 7 are distributed in a radial mode, and an outer mold limiting ring 8 is arranged on the mold bottom plate 3; the core 9, the said core 9 is installed on the said core mounting groove 5 through the core saddle 10; the inner die structure is provided with a plurality of inner die block groups, the inner die block groups are closely and annularly arranged on the die bottom plate, mutual limiting on a plane can be realized between each inner die block group, each inner die block group comprises a first small inner die block 11, a second small inner die block 12 and a large inner die block 13, the first small inner die block 11 and the second small inner die block 12 are closely arranged on two sides of the large inner die block 13, an inner die insert block 14 is arranged at the bottom of the large inner die block 13, and the inner die insert block 14 is used for being inserted into the inner die insert slot 6; an outer mold structure provided with a plurality of outer modules 15, said outer modules 15 being slidingly arranged on said guide grooves 7; the material guide plate 16 is arranged at the top of the outer mold structure and the inner mold structure, a plurality of material guide holes 17 are formed in the material guide plate 16, the material guide holes 17 are communicated with a material cavity of a mold, an outer mold ring sleeve 18 is fixedly arranged at the bottom of the material guide plate 16, and the outer mold ring sleeve 18 is tightly sleeved on the outer side of the outer mold structure; and the cover plate 19 is arranged on the top of the material guide plate 16, and a filling port 20 is arranged between the cover plate 19 and the material guide plate 16.

The exhaust rectifier integral wax mould pressing type mould according to the above embodiment of the invention is characterized in that a material cavity of the mould is formed by gaps among the material guide plate 16, the mould bottom plate 3, the inner mould structure, the outer mould structure, the core 9 and the inner mould core 4 together, wherein a part of the bottom surface of the material guide plate 16 is used as a top forming surface of the wax mould, a part of the top surface of the mould bottom plate 3 is used as a bottom forming surface of the wax mould, an inner wall of the outer mould structure is used as an outer forming surface of the wax mould, an outer wall of the inner mould core 4 is used as an inner forming surface of the wax mould, a gap of the core 9 is used as an inner blade forming cavity of the wax mould, and a gap of the inner mould structure is used as an outer blade forming cavity of the wax mould. When the mold is installed and begins to produce, the profiling mold can be placed in the material injection machine, a pressing plate of the material injection machine can provide enough pressure to press down the cover plate 19, so that the top and the bottom of the profiling mold have enough supporting force during material injection, meanwhile, the outer mold ring sleeve 18 is arranged to provide outer supporting force, the inner mold core 4 can provide inner supporting force for the mold, the material injection machine can inject filler into the material injection port 20, the filler can rapidly enter the material cavity through the material guide holes 17 and is filled into the shape of the integral wax mold of the exhaust rectifier, after the filler is cooled, the pressing plate is lifted, the wax mold communicating mold core 9 is taken out in a de-molding mode, and then the mold core 9 is dissolved to obtain the complete wax mold.

As shown in fig. 7 to 9, the present invention further includes: the die lifting plate 21 is arranged inside the arc-shaped die supporting seat 2, a plurality of die lifting grooves are uniformly formed in the die core mounting groove 5, a die lifting block 22 is movably inserted into each die lifting groove, and the die lifting plate 21 is used for jacking the die lifting block 22 from the bottom.

The two sides of the stripping plate 21 are provided with stripping lifting plates 23, the stripping lifting plates 23 are arranged in the gap between the two arc-shaped mold supporting seats 2, the stripping lifting plates 23 are provided with lifting operation holes, the two sides of the mold base 1 are provided with stepped lifting blocks 24, and the lifting blocks 24 are arranged in the lifting operation holes in a penetrating manner.

Wherein, the lifting template 21 is provided with a lightening hole 25.

According to the integral wax mould pressing type mould of the exhaust rectifier in the embodiment of the invention, the guide cylinder 26 is arranged at the center of the stripping plate 21, the guide cylinder 26 is matched with the middle through hole of the inner mould core 4, the two sides of the stripping plate 21 are provided with the mounting holes, the stripping lifting plate 23 is mounted at the bottom of the stripping plate 21 through the mounting holes, the stripping lifting plate 23 extends outwards towards the gap of the arc-shaped mould supporting seat 2 for personnel operation, an operator can lift the stripping plate 21 integrally by lifting the stripping lifting plate 23, the stripping plate can collide with the lifting module 22 after being lifted, and the mould core support 10 in the mould core mounting groove 5 is lifted up through the lifting module 22 so as to lift the whole wax mould; when an operator cannot lift the mold manually, a screwdriver or other lever tools can be inserted into a gap between the mold stripping and lifting plate 23 and the lifting block 24, the lifting block 24 is of a step-shaped structure, so that the mold stripping and lifting plate 23 can be pried step by using tools, meanwhile, the lifting block 24 has a vertically upward guiding effect on the movement of the mold stripping and lifting plate 23 because the width of the lifting operation hole is the same as that of the lifting block 24, the operator can have a larger mold stripping force by priing the lifting block 24, and the mold stripping does not affect the shape and the precision of the wax mold.

As shown in fig. 1 to 7, the outer mold driving mechanism is provided with an annular driving plate 26, an arc-shaped driving slot 27 is opened on the annular driving plate 26, a driving block 28 is provided at the bottom of each outer module 15, a driving post 29 is provided at the bottom of the driving block 28, a U-shaped hole 30 is opened in the guiding slot 7, the outer module 15 is slidably disposed in the guiding slot 7 through the driving block 28, and the driving post 29 is slidably disposed in the arc-shaped driving slot 27 through the U-shaped hole 30.

Wherein, the side of the annular driving plate 26 is provided with a driving rod 31.

In the integral wax mould pressing type die for the exhaust rectifier according to the above embodiment of the present invention, the arc-shaped driving grooves 27 are distributed on the annular driving plate 26 in a vortex shape, the outer edge of the arc-shaped die supporting seat 2 is provided with a concave portion adapted to the annular driving plate 26, the concave portion on one side is further provided with a driving rod groove, the driving rod 31 is fixedly installed at the bottom of the side surface of the annular driving plate 26, and the driving rod 31 can freely rotate in the driving rod 31 groove; since the driving column 29 is slidably disposed in the arc-shaped driving slot 27 and the driving block 28 is slidably disposed in the guiding slot 7, when the driving rod 31 is pulled, the annular driving plate 26 rotates along with the driving column, and the driving block 28 is driven by the driving column 29 to move along the guiding slot 7 during the rotation; therefore, when the annular driving plate 26 rotates, all the outer modules 15 synchronously slide along the guide grooves 7, so that quick demolding is realized, and meanwhile, the outer modules do not collide with an inner wax mold in the demolding process, so that the quality of the wax mold is ensured.

As shown in fig. 4, a first vane type groove 32 is formed on one side of the first small inner module 11, and a second vane type groove 33 is formed on one side of the second small inner module 12.

The top of the first small inner module 11, the top of the second small inner module 12 and the top of the big inner module 13 are all provided with an operation hole 34.

In the integral wax mould pressing type mould for the exhaust gas rectifier according to the embodiment of the invention, the first blade-shaped groove 32 of the first small inner mould block 11 and the second blade-shaped groove 33 adjacent to the second small inner mould block 12 can form a large blade forming cavity of the wax mould, and meanwhile, the tops of the first small inner mould block 11, the second small inner mould block 12 and the large inner mould block 13 are all provided with the operation holes 34, so that an operator can directly take out the first small inner mould block 11, the second small inner mould block 12 and the large inner mould block 13 by hand through the operation holes 34.

As shown in fig. 1, a cover handle 35 is provided on a side surface of the cover 19, and a mold base handle 36 is provided on a side surface of the mold base 3.

According to the integral wax mould pressing type mould for the exhaust rectifier in the embodiment of the invention, the cover plate 19 and the mould bottom plate 3 can be conveniently carried and taken by an operator through the cover plate handle 35 and the mould bottom plate handle 36.

As shown in fig. 10, a material guide groove 37 is formed in the bottom surface of the cover plate 19, and the material guide groove 37 is respectively communicated with the material injection port 20 and the material guide hole 17.

In the integral wax mould pressing type mold for the exhaust rectifier according to the above embodiment of the invention, during material injection, the filler enters from the injection port 20, enters the material guide holes 17 through the material guide chute 37, and then fills the material cavity.

The integral wax mould pressing type mould for the exhaust rectifier in the embodiment of the invention comprises the following specific processes during demoulding: lifting a pressing plate of the injection molding machine, taking down the cover plate 19 and the material guide plate 17 one by one, and pulling the driving rod 31 to realize the demolding of the external mold structure, wherein after the driving rod 31 is pulled, the annular driving plate 26 rotates around the center of the mold base 1, all the driving blocks 28 synchronously move in the same direction along the guide groove 7 during the rotation, and each external module 15 outwards displaces in the vertical direction to realize the integral demolding of the external mold structure; manually taking out the inner module group through the operation hole 34 to realize the demoulding of the inner module structure; lifting the stripping plate 22 through the stripping lifting plate 23, further lifting the lifting module 22, so that the lifting module 22 lifts the core holder 10 upwards, thereby realizing bottom demolding of the wax mold, as shown in fig. 11, the core 9 is still retained inside the wax mold after demolding is finished, and the integral wax mold of the exhaust rectifier as shown in fig. 12 can be obtained after the core 9 is dissolved through corresponding substances; the installation process of the exhaust rectifier inner ring core type mould is reverse to the flow.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.