Compression mold of hollow blade casting wax mold

Abstract

The invention relates to the technical field of high-temperature alloy investment casting, in particular to a hollow blade casting wax mold profiling mold which comprises a positioning plate, a lower mold plate, an upper mold plate and a pressing plate which are sequentially arranged from bottom to top. An annular table is arranged in the center of the top surface of the positioning plate; a core column socket is mounted on a central counter bore of the annular table; a plurality of core column jacks are annularly and uniformly distributed on the core column socket, and ceramic core columns are vertically inserted into the core column jacks; the lower end face of the ceramic core column abuts against the top face of the annular table. A ceramic core disc is mounted at the annular sinking groove in the top surface of the lower mold plate; a plurality of blade forming holes are annularly and uniformly distributed in the ceramic core disc; a plurality of core column positioning holes are annularly and uniformly distributed in the lower mold plate, and the upper ends of the ceramic core columns penetrate through the core column positioning holes and then extend into blade forming holes of the ceramic core disc; and the outer peripheral surface of the upper end of the ceramic core column and the inner hole surface of the blade forming hole are arranged at intervals. The defect that the wall thickness of the blade is out of tolerance can be avoided, and then a qualified wax piece is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature alloy investment casting, in particular to a pressing mold for a hollow blade casting wax mold. Background Art

[0002] The starting turbine blade is the core component of the engine. It is in a high temperature environment and is subjected to complex stress and strain tests. It needs to have high temperature resistance, strength and creep resistance. As people's requirements for the performance of aircraft engines continue to increase, the temperature bearing capacity of existing high-temperature alloy materials has reached its limit. Changing the cooling structure of the blade and improving the cooling efficiency have become the goals pursued by engine designers.

[0003] The inner cavity shape of the hollow blade is very complex, with high dimensional accuracy and strict wall thickness requirements. Traditional methods such as forging and electrochemical processing cannot meet the expected performance requirements, and 3D printing cannot meet the dimensional accuracy requirements. Therefore, in order to obtain high-performance and high-precision hollow blades, the "investment casting + precision casting" technical method can solve this problem. The general casting process of hollow blade products: prepare ceramic core → prepare wax mold → prepare mold shell → smelting and pouring → post-processing.

[0004] Combination Figure 1 , Figure 2 The figure shows the structure diagram of a certain type of starter turbine. The blades on the starter turbine are hollow, and the key technology of the precision investment casting of the starter turbine is the wax pattern preparation process.

[0005] Combination Figure 3 , Figure 4 As shown, it is a schematic diagram of the wax model structure of the starting turbine. The wax model includes a disc body 100 and an annular body 101. The disc body 100 and the annular body 101 are connected by a plurality of hollow blades 102. The inner cavity of the blade 102 extends downward and penetrates the annular body 101. Three inner runners 103 are formed on the lower surface of the annular body 101, and three fan-shaped protrusions 104 are evenly distributed on the top surface of the disc body 100.

[0006] The difficulty in preparing the above wax model lies in how to accurately position the ceramic core in the pressing mold, and the wax filling process will not be impacted by the wax material and cause the ceramic core to shift, resulting in excessive blade wall thickness defects, and thus obtaining qualified wax parts. Summary of the invention

[0007] The main purpose of the present invention is to provide a pressing mold for a hollow blade casting wax mold, aiming to solve the above technical problems.

[0008] To achieve the above-mentioned purpose, the present invention proposes a pressing mold for a hollow blade casting wax mold, comprising a positioning plate, a lower template, an upper template and a pressing plate arranged in sequence from bottom to top; an annular platform is arranged at the center of the top surface of the positioning plate, and a core column socket is installed on the central countersunk hole of the annular platform; a plurality of core column insertion holes are evenly distributed in an annular manner on the core column socket, and a ceramic core column is vertically inserted in the core column insertion hole; the lower end surface of the ceramic core column abuts against the top surface of the annular platform; a ceramic core disk is installed at the annular countersunk groove on the top surface of the lower template, and a plurality of blade forming holes are evenly distributed in an annular manner on the ceramic core disk; a plurality of core column positioning holes are evenly distributed in an annular manner on the lower template, and the upper end of the ceramic core column passes through the core column positioning hole and then extends into the blade forming hole of the ceramic core disk; the outer peripheral surface of the upper end of the ceramic core column is spaced apart from the inner hole surface of the blade forming hole.

[0009] Preferably, a positioning protrusion is integrally formed on the outer circumferential surface of the ceramic core disk, and a positioning notch is provided on the side wall of the annular recess of the lower template; the positioning protrusion is stuck in the positioning notch.

[0010] Preferably, an axial limit notch is provided on the ceramic core column; two slide grooves are provided on the positioning plate, and a slider is slidably installed on the slide groove, a semi-ring body is fixed on the slider, and a snap-in edge plate is integrally formed on the inner hole surface of the semi-ring body; when the two sliders slide relatively close to each other on the slide groove, the two semi-ring bodies are spliced ​​into a whole ring, the snap-in edge plate is placed on the top surface of the core column socket, and the snap-in edge plate is snapped into the axial limit notch of the ceramic core column.

[0011] Preferably, a raised block is integrally formed on the top surface of the slider, and an inclined surface is arranged on the raised block; a wedge block is connected to the upper template by screws; a square hole is arranged on the lower template; when the upper template and the lower template are molded together, after the wedge block passes through the square hole, the inclined surface of the wedge block cooperates with the inclined surface of the raised block to push the two sliders to slide inward in the slide groove.

[0012] Preferably, wax inlet grooves are respectively provided on the upper surface of the lower template and the lower surface of the upper template; wax injection ports are respectively provided on the upper surface of the lower template and the side surface of the upper template; the wax injection ports are connected with the wax inlet grooves; the cavity of the upper template is connected with the wax inlet groove through three connecting grooves; the wax inlet groove is semicircular in shape, and is respectively concentrically arranged with the cavity of the lower template and the upper template, and is located on the outside of the cavity of the lower template and the upper template.

[0013] Preferably, three fan-shaped grooves are evenly distributed on the top wall of the cavity of the upper template, which are used to form the fan-shaped protrusions on the wax mold; an exhaust groove is arranged on the top surface of the upper template; the exhaust groove is connected to the fan-shaped groove through an exhaust hole, and a breathable plug is plugged in the exhaust hole.

[0014] Preferably, three fan-shaped holes are evenly distributed on the lower template, the positioning plate, and the stem socket for forming the inner runner on the wax mold.

[0015] Preferably, a bottom plate is arranged at intervals below the positioning plate, and two supporting plates are arranged between the bottom plate and the positioning plate; the latch penetrates the bottom plate and the supporting plate from bottom to top and is inserted into the positioning plate; the pressing mold also includes an ejection mechanism for ejecting the wax mold after molding, and the ejection mechanism includes a combination plate and three arc-shaped top plates arranged on the combination plate; the upper end of the arc-shaped top plate extends into the fan-shaped hole of the positioning plate; the combination plate is arranged between the two supporting plates; a rotating shaft is inserted into the two supporting plates, and a handle is arranged at one end of the rotating shaft; a cam is installed in the middle of the rotating shaft; the cam and the lower surface of the combination plate are slidably matched to drive the combination plate to move upward.

[0016] Preferably, the ejection mechanism also includes a first ejector pin and a second ejector pin mounted on the combination plate; the upper end of the first ejector pin extends upward and passes through the positioning plate and then abuts against the lower end surface of the ceramic core column; the number of the first ejector pins is equal to the number of ceramic core columns; the upper end of the second ejector pin extends upward and passes through the positioning plate, the core column socket, and the lower template in sequence and then abuts against the lower end surface of the ceramic core disk; the number of the second ejector pins is four.

[0017] Preferably, the ejection mechanism also includes four guide columns and a central ejector rod installed on the combined plate; the four guide columns are respectively installed at the four corners of the combined plate, and the upper ends of the guide columns extend upward and are inserted into the guide holes of the positioning plate and the lower template; the upper end of the central ejector rod extends upward and passes through the positioning plate, the core column socket, and the center hole of the lower template in sequence; a spring is sleeved on the guide column, and the spring is located between the combined plate and the positioning plate; when the ejection mechanism is in a non-ejected state, the top surfaces of the guide columns and the central ejector rod are flush with the top surface of the lower template.

[0018] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0019] (1) In the pressing mold provided in the present invention, a ceramic core column is used to form the inner hole of the blade on the wax mold, and the gap between the outer peripheral surface of the upper end of the ceramic core column and the inner hole surface of the blade forming hole on the ceramic core disk is used to ensure the wall thickness of the blade on the wax mold. The lower end and the middle part of the ceramic core column are positioned by using the core column insertion hole on the core column socket and the core column positioning hole on the lower template, and the ceramic core column is axially limited by the top surface of the annular platform to ensure the accuracy of the position of the ceramic core column. At the same time, the ceramic core disk is installed and positioned by using the annular groove on the top surface of the lower template to ensure the relative position of the ceramic core disk and the ceramic core column, thereby ensuring a uniform gap between the outer peripheral surface of the upper end of the ceramic core column and the inner hole surface of the blade forming hole, thereby ensuring a uniform wall thickness of the blade on the wax mold.

[0020] (2) In the present invention, by arranging the wax inlet groove on the upper surface of the lower template and the lower surface of the upper template, the cavity of the upper template is connected to the wax inlet groove through three connecting grooves. When injecting wax, the wax enters the cavity of the upper template through the three connecting grooves, and does not cause impact on the ceramic core column, thereby preventing the ceramic core column from being displaced or broken.

[0021] (3) In the press mold provided by the present invention, an ejection mechanism is provided to facilitate ejection of the formed wax mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the starting turbine;

[0024] Figure 2 for Figure 1 Schematic diagram after the middle line AA is cut open;

[0025] Figure 3 Wax model structure diagram of the starting turbine Figure 1 ;

[0026] Figure 4 Wax model structure diagram of the starting turbine Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the external structure of the pressing die provided by the present invention;

[0028] Figure 6 for Figure 5 Sectional view along BB;

[0029] Figure 7 It is a schematic diagram of the exploded structure of part of the pressing mold provided by the present invention;

[0030] Figure 8 A schematic diagram of the internal structure of the pressing mold provided by the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the ceramic core column in the present invention;

[0032] Fig.10 It is a partial structural schematic diagram of the ejection mechanism in the present invention;

[0033] Fig.11 It is a schematic diagram of the installation structure of the rotating shaft and the cam in the present invention;

[0034] Fig.12 The structure of the upper template in the present invention is shown in FIG. Figure 1 ;

[0035] Fig.13 The structure of the upper template in the present invention is shown in FIG. Figure 2 ;

[0036] Fig.14 The structure of the lower template in the present invention is shown in FIG. Figure 1 ;

[0037] Fig.15 The structure of the lower template in the present invention is shown in FIG. Figure 2 ;

[0038] Fig.16 It is a structural schematic diagram of the positioning plate in the present invention.

[0039] Explanation of the accompanying drawings: 1. Positioning plate; 1a. Ring stage; 1b. Slide; 2. Lower template; 2a. Core column positioning hole; 2b. Positioning notch; 3. Upper template; 3a. Fan-shaped sink; 3b. Exhaust hole; 3c. Ventilation plug; 3d. Exhaust groove; 4. Press plate; 5. Core column socket; 5a. Core column plug hole; 6. Ceramic core column; 6a. Axial limit notch; 7. Ceramic core disk; 7a. Blade forming hole; 7b. Positioning convex block; 8. Sliding block; 8a. Raised block; 9. Semi-ring body; 9a. Clamping edge plate; 10. Wedge block; 11. Wax inlet groove; 12. Wax injection port; 13. Wax inlet port; 14. Bottom Plate; 15, support plate; 16, latch; 17, combination plate; 17a, upper plate body; 17b, lower plate body; 18, arc-shaped top plate; 19, rotating shaft; 20, cam; 21, handle; 22, first ejector pin; 23, second ejector pin; 24, guide column; 25, center ejector rod; 26, baffle; 27, spring; 28, first screw; 29, second screw; 30, third screw; 31, fourth screw; 32, fifth screw; 33, lifting ring; 34, handle; 35, support column; 100, disc body; 101, annular body; 102, blade; 103, ingrown channel; 104, fan-shaped protrusion. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] Combination Figure 1 , Figure 2The figure shows the structure of a certain type of starter turbine. The blades on the starter turbine are hollow. The key technology of precision investment casting of the starter turbine is the wax pattern preparation process. Figure 3 , Figure 4 As shown, it is a schematic diagram of the wax model structure of the starter turbine, the wax model has a disc body 100 and an annular body 101, the disc body 100 and the annular body 101 are connected by a plurality of hollow blades 102, the inner cavity of the blades 102 extends downward and penetrates the annular body 101, three ingates 103 are formed on the lower surface of the annular body 101, and three fan-shaped protrusions 104 are evenly distributed on the top surface of the disc body 100. After the wax mold casting forms the part, the three fan-shaped protrusions 104 are used as clamping parts for machining the part.

[0044] Combination Figures 5 to 16 As shown, it is a specific embodiment of a pressing mold for a hollow blade casting wax mold provided by the present invention, the pressing mold comprises a positioning plate 1, a lower mold plate 2, an upper mold plate 3 and a pressing plate 5 which are arranged in sequence from bottom to top; an annular platform 1a is arranged at the center of the top surface of the positioning plate 1, and a stem column socket 5 is installed on the central countersunk hole of the annular platform 1a; a plurality of stem column insertion holes 5a are evenly distributed in an annular manner on the stem column socket 5, and a ceramic stem column 6 is vertically inserted in the stem column insertion hole 5a; the lower end surface of the ceramic stem column 6 abuts against the top surface of the annular platform 1a; a ceramic core disk 7 is installed at the annular countersunk groove on the top surface of the lower mold plate 2, and a plurality of blade forming holes 7a are evenly distributed in an annular manner on the ceramic core disk 7; a plurality of stem column positioning holes 2a are evenly distributed in an annular manner on the lower mold plate 2, and the upper end of the ceramic stem column 6 passes through the stem column positioning hole 2a and then extends to the blade forming hole 7a of the ceramic core disk 7; the outer peripheral surface of the upper end of the ceramic stem column 6 is spaced apart from the inner hole surface of the blade forming hole 7a. The inner hole of the blade 102 on the wax mold is formed by using the ceramic core column 6, and the gap between the outer peripheral surface of the upper end of the ceramic core column 6 and the inner hole surface of the blade forming hole 7a on the ceramic core disk 7 ensures the wall thickness of the blade 102 on the wax mold.

[0045] By adopting the above structure, the lower end and the middle part of the ceramic core column 6 are positioned respectively by using the core column insertion hole 5a on the core column socket 5 and the core column positioning hole 2a on the lower template 2, and the ceramic core column 6 is axially limited by the top surface of the annular platform 1a to ensure the accuracy of the position of the ceramic core column 6. At the same time, the ceramic core disk 7 is installed and positioned by using the annular groove on the top surface of the lower template 2, which ensures the relative position of the ceramic core disk 7 and the ceramic core column 6, thereby ensuring a uniform gap between the outer peripheral surface of the upper end of the ceramic core column 6 and the inner hole surface of the blade forming hole 7a, thereby ensuring the uniform wall thickness of the blade 102 on the wax mold.

[0046] Combination Figure 7 , Fig.14As shown, a positioning protrusion 7b is integrally formed on the outer circumferential surface of the ceramic core disk 7, and a positioning notch 2b is provided on the side wall of the annular groove of the lower template 2; the positioning protrusion 7b is stuck in the positioning notch 2b, which plays a role of circumferential limiting the ceramic core disk 7, thereby preventing the ceramic core disk 7 from rotating around its own axis.

[0047] Combination Figure 6 , Figure 7 As shown, an axial limiting notch 6a is provided on the ceramic core column 6; two slide grooves 1b are provided on the positioning plate 1, and a slider 8 is slidably installed on the slide groove 1b, a semi-ring body 9 is fixedly connected to the slider 8, and a snap-in edge plate 9a is integrally formed on the inner hole surface of the semi-ring body 9; when the two sliders 8 slide relatively close to each other on the slide groove, the two semi-ring bodies 9 are spliced ​​into a whole ring, and the snap-in edge plate 9a rests on the top surface of the core column socket 5, which plays an axial pressing role on the core column socket 5. At the same time, the snap-in edge plate 9a is snapped into the axial limiting notch 6a of the ceramic core column 6 to prevent the ceramic core column 6 from axial movement. A handle 34 is provided on the slider 8, which is convenient for pulling the slider 8 outward after the mold is opened.

[0048] Combination Figure 6 , Figure 7 As shown, a protruding block 8a is integrally formed on the top surface of the slider 8, and an inclined surface is arranged on the protruding block 8a; a wedge block 10 is connected to the upper template 3 by screws; a square hole 2c is arranged on the lower template 2; when the upper template 3 and the lower template 2 are molded together, after the wedge block 10 passes through the square hole 2c, the inclined surface of the wedge block 10 cooperates with the inclined surface of the protruding block 8a, which can push the two sliders 8 to slide inward in the slide groove.

[0049] Combination Fig.12 , Fig.14 As shown, wax inlet grooves 11 are respectively provided on the upper surface of the lower template 2 and the lower surface of the upper template 3; wax injection ports 12 are respectively provided on the upper surface of the lower template 2 and the side of the upper template 3; the wax injection ports 12 are connected to the wax inlet grooves 11; the mold cavity of the upper template 3 is connected to the wax inlet groove 11 through three connecting grooves 13; the wax inlet groove 11 is semicircular in shape, and is respectively concentrically arranged with the mold cavities of the lower template 2 and the upper template 3, and is located outside the mold cavities of the lower template 2 and the upper template 3. In this embodiment, the mold cavity of the upper template 3 is used to form a circular disc body 100 of the wax mold, and the annular sink groove of the lower template 2 is a stepped groove structure, the ceramic core disk 7 is installed on the step surface of the stepped groove, and the lower part of the stepped groove is used to form an annular body 101 of the wax mold. During wax injection, the wax enters the cavity of the upper mold plate 3 through the three connecting grooves 13, which diverts the wax and does not impact the ceramic core column 6, thereby preventing the ceramic core column 6 from displacement or breakage.

[0050] Combination Fig.12 , Fig.13 As shown, three fan-shaped recesses 3a are evenly distributed on the top wall of the cavity of the upper template 3, which are used to form the fan-shaped protrusions 104 on the wax mold; an exhaust groove 3d is provided on the top surface of the upper template 3; the exhaust groove 3d is connected to the fan-shaped recess 3a through an exhaust hole 3b, and a vent plug 3c is plugged in the exhaust hole 3b. The exhaust hole 3b is provided to play the role of exhaust when the press mold is injected with wax.

[0051] Combination Figure 6 , Figure 7 As shown, three fan-shaped holes are evenly distributed on the lower mold plate 2, the positioning plate 1, and the stem socket 5 for forming the inner runner 103 on the wax mold.

[0052] Combination Figure 6 , Figure 8 As shown, a bottom plate 14 is arranged below the positioning plate 1, and two support plates 15 are arranged between the bottom plate 14 and the positioning plate 1; a latch 16 passes through the bottom plate 14 and the support plates 15 from bottom to top and is inserted into the positioning plate 1; two baffles 26 are also arranged between the bottom plate 14 and the positioning plate 1. The first screw 28 connects and fixes the bottom plate 14, the baffle 26, and the positioning plate 1. Specifically, the first screw 28 passes through the bottom plate 14 and the baffle 26 from bottom to top and is screwed onto the positioning plate 1. The bottom plate 14 and the baffle 26 are also fastened and connected by a plurality of second screws 29.

[0053] Combination Figure 5 , Figure 8 As shown, in this embodiment, the positioning plate 1 and the lower template 2 are fastened together by a plurality of third screws 30. The pressing plate 4 and the upper template 3 are connected by a plurality of fourth screws 31. In this embodiment, a lifting ring 33 is provided on the end faces of both ends of the upper template 3. When the entire press mold is lifted, the assembly formed by the pressing plate 4 and the upper template 3 needs to be fixed on the lower template 2. At this time, the fifth screw 32 can be used to pass through the pressing plate 4 and the upper template 3 from top to bottom in sequence and then screwed on the lower template 2.

[0054] Combination Figure 6 , Figure 8 , Fig.10 and Fig.11As shown, the press mold also includes an ejection mechanism for ejecting the formed wax mold, and the ejection mechanism includes a combination plate 17 and three arc-shaped top plates 18 arranged on the combination plate 17; the upper end of the arc-shaped top plate 18 extends into the fan-shaped hole of the positioning plate 1; the combination plate 17 is arranged between two support plates 15; a rotating shaft 19 is inserted on the two support plates 15, and a handle 21 is arranged at one end of the rotating shaft 19; a cam 20 is installed in the middle of the rotating shaft 19; the cam 20 and the lower surface of the combination plate 17 are slidably matched to drive the combination plate 17 to move upward. When ejecting the formed wax mold, by shaking the handle 21, the cam 20 drives the combination plate 17 to move upward, and the wax mold can be ejected by using the arc-shaped top plate 18 to push against the inner runner 103 of the wax mold.

[0055] Combination Figure 6 , Figure 8 and Fig.10 To ensure the ejection effect, the ejection mechanism also includes a first ejector pin 22 and a second ejector pin 23 mounted on the combination plate 17; the upper end of the first ejector pin 22 extends upward and passes through the positioning plate 1 and then abuts against the lower end surface of the ceramic core column 6; the number of the first ejector pins 22 is equal to the number of the ceramic core columns 6; the upper end of the second ejector pin 23 extends upward and passes through the positioning plate 1, the core column socket 5, and the lower mold plate 2 in sequence and then abuts against the lower end surface of the ceramic core disk 7; the number of the second ejector pins 23 is four. When ejecting the formed wax mold, the first ejector pin 22 can be pushed against the ceramic core column 6, and the second ejector pin 23 can be pushed against the ceramic core disk 7, and the formed wax mold is ejected together.

[0056] Furthermore, the ejection mechanism also includes four guide columns 24 and a central ejector rod 25 installed on the combination plate 17; the four guide columns 24 are respectively installed at the four corners of the combination plate 17, and the upper ends of the guide columns 24 extend upward and are inserted into the guide holes of the positioning plate 1 and the lower template 2; the upper end of the central ejector rod 25 extends upward and passes through the positioning plate 1, the core column socket 5, and the center hole of the lower template 2 in sequence; a spring 27 is sleeved on the guide column 24, and the spring 27 is located between the combination plate 17 and the positioning plate 1; when the ejection mechanism is in a non-ejection state, the top surfaces of the guide columns 24 and the central ejector rod 25 are flush with the top surface of the lower template 2. The guide columns 24 are provided to play a guiding role, and the spring 27 is used to play a buffering role to avoid the ejection speed being too fast. When the formed wax mold is ejected, the central ejector rod 25 can be fixed on the disk body 100 of the wax mold.

[0057] In this embodiment, the combined plate 17 includes an upper plate body 17a and a lower plate body 17b, and the lower ends of the arc-shaped top plate 18, the first top pin 22, the second top pin 23, the guide column 24, and the center top rod 25 are all provided with axial limit heads, and the axial limit heads are all installed on the stepped holes of the upper plate body 17a, and are tightened by the lower plate body 17b. The upper plate body 17a and the lower plate body 17b are fastened to each other by screws.

[0058] Combination Figure 8 As shown, a plurality of support columns 35 are installed on the top surface of the bottom plate 14 , and when the combined plate 17 is lowered to the lowest position, the support columns 35 are used to support the combined plate 17 .

[0059] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A hollow blade casting wax mold pressing die, characterized in that: It comprises a positioning plate (1), a lower template (2), an upper template (3) and a pressing plate (5) which are arranged in sequence from bottom to top; An annular platform (1a) is arranged at the center of the top surface of the positioning plate (1), and a stem column socket (5) is installed on the central countersunk hole of the annular platform (1a); a plurality of stem column insertion holes (5a) are evenly distributed in an annular manner on the stem column socket (5), and a ceramic stem column (6) is vertically inserted into the stem column insertion hole (5a); the lower end surface of the ceramic stem column (6) abuts against the top surface of the annular platform (1a); A ceramic core disk (7) is installed at the annular recessed groove on the top surface of the lower mold plate (2), and a plurality of blade forming holes (7a) are evenly distributed in an annular manner on the ceramic core disk (7); A plurality of core column positioning holes (2a) are evenly distributed in an annular pattern on the lower template (2); the upper end of the ceramic core column (6) passes through the core column positioning hole (2a) and then extends into the blade forming hole (7a) of the ceramic core disk (7); the outer peripheral surface of the upper end of the ceramic core column (6) is spaced apart from the inner hole surface of the blade forming hole (7a).

2. A hollow blade casting wax mold die as claimed in claim 1, characterized in that: A positioning protrusion (7b) is integrally formed on the outer peripheral surface of the ceramic core disk (7), and a positioning notch (2b) is provided on the side wall of the annular recess of the lower template (2); the positioning protrusion (7b) is stuck in the positioning notch (2b).

3. A hollow blade casting wax mold die as claimed in claim 1, characterized in that: An axial limiting notch (6a) is provided on the ceramic core column (6); two slide grooves (1b) are provided on the positioning plate (1), and a slider (8) is slidably mounted on the slide groove (1b), a semi-ring body (9) is fixedly connected to the slider (8), and a clamping edge plate (9a) is integrally formed on the inner hole surface of the semi-ring body (9); When the two sliders (8) slide relatively close to each other on the slide groove, the two semi-ring bodies (9) are spliced ​​into a complete ring, the clamping edge plate (9a) is placed on the top surface of the stem socket (5), and the clamping edge plate (9a) is clamped into the axial limiting notch (6a) of the ceramic stem (6).

4. A hollow blade casting wax mold die as claimed in claim 3, characterized in that: A protruding block (8a) is integrally formed on the top surface of the slider (8), and an inclined surface is arranged on the protruding block (8a); a wedge block (10) is connected to the upper template (3) by screws; a square hole (2c) is arranged on the lower template (2); when the upper template (3) and the lower template (2) are molded together, after the wedge block (10) passes through the square hole (2c), the inclined surface of the wedge block (10) cooperates with the inclined surface of the protruding block (8a), pushing the two sliders (8) to slide inward in the slide groove.

5. A hollow blade casting wax mold pressing die as claimed in claim 1, characterized in that: A wax inlet groove (11) is provided on the upper surface of the lower template (2) and the lower surface of the upper template (3), respectively; a wax injection port (12) is provided on the upper surface of the lower template (2) and the side surface of the upper template (3), respectively; the wax injection port (12) is connected to the wax inlet groove (11); the mold cavity of the upper template (3) is connected to the wax inlet groove (11) through three connecting grooves (13); the wax inlet groove (11) is semicircular in shape, and is respectively arranged concentrically with the mold cavities of the lower template (2) and the upper template (3), and is located outside the mold cavities of the lower template (2) and the upper template (3).

6. A hollow blade casting wax mold pressing die as claimed in claim 1, characterized in that: Three fan-shaped recessed grooves (3a) are evenly distributed on the top wall of the cavity of the upper template (3) for forming the fan-shaped protrusions (104) on the wax mold; an exhaust groove (3d) is arranged on the top surface of the upper template (3); the exhaust groove (3d) is connected to the fan-shaped recessed groove (3a) through an exhaust hole (3b), and a vent plug (3c) is plugged in the exhaust hole (3b).

7. A hollow blade casting wax mold pressing die as claimed in claim 1, characterized in that: Three fan-shaped holes are evenly distributed on the lower mold plate (2), the positioning plate (1), and the stem socket (5) for forming an inner runner (103) on the wax mold.

8. A hollow blade casting wax mold pressing die as claimed in claim 7, characterized in that: A bottom plate (14) is arranged at intervals below the positioning plate (1), and two support plates (15) are arranged between the bottom plate (14) and the positioning plate (1); a latch (16) penetrates the bottom plate (14) and the support plate (15) from bottom to top and is then inserted into the positioning plate (1); The press mold also includes an ejection mechanism for ejecting the wax mold after molding, and the ejection mechanism includes a combination plate (17) and three arc-shaped top plates (18) arranged on the combination plate (17); the upper end of the arc-shaped top plate (18) extends into the fan-shaped hole of the positioning plate (1); the combination plate (17) is arranged between two support plates (15); a rotating shaft (19) is inserted into the two support plates (15), and a handle (21) is arranged at one end of the rotating shaft (19); a cam (20) is installed in the middle of the rotating shaft (19); the cam (20) is slidably matched with the lower surface of the combination plate (17) to drive the combination plate (17) to move upward.

9. A hollow blade casting wax mold pressing die as claimed in claim 8, characterized in that: The ejection mechanism further comprises a first ejector pin (22) and a second ejector pin (23) mounted on the assembly plate (17); The upper end of the first ejector pin (22) extends upward and passes through the positioning plate (1) and then abuts against the lower end surface of the ceramic core column (6); the number of the first ejector pins (22) is equal to the number of the ceramic core columns (6); The upper end of the second ejector pin (23) extends upward and passes through the positioning plate (1), the stem socket (5), and the lower mold plate (2) in sequence before abutting against the lower end surface of the ceramic core disk (7); the number of the second ejector pins (23) is four.

10. A hollow blade casting wax mold pressing die as claimed in claim 8, characterized in that: The ejection mechanism further comprises four guide columns (24) and a central ejector rod (25) mounted on the combined plate (17); the four guide columns (24) are respectively mounted at the four corners of the combined plate (17); the upper ends of the guide columns (24) extend upward and are inserted into the guide holes of the positioning plate (1) and the lower template (2); The upper end of the central push rod (25) extends upward and passes through the central hole of the positioning plate (1), the stem socket (5), and the lower template (2) in sequence; A spring (27) is sleeved on the guide column (24), and the spring (27) is located between the combination plate (17) and the positioning plate (1); When the ejection mechanism is in a non-ejection state, the top surfaces of the guide column (24) and the center ejector rod (25) are flush with the top surface of the lower template (2).

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