A compression mold for starting turbine wax mold

Abstract

This invention relates to the field of high-temperature alloy investment casting technology, and particularly to a molding die for a wax model of a hollow blade casting. The die includes a positioning plate, a lower template, an upper template, and a pressure plate arranged sequentially from bottom to top. An annular platform is located at the center of the top surface of the positioning plate, and a core post socket is installed in the central countersunk hole of the annular platform. Multiple core post insertion holes are evenly distributed in a ring on the core post socket, and ceramic core posts are vertically inserted into these holes. The lower end face of the ceramic core post abuts against the top surface of the annular platform. A ceramic core disc is installed in the annular groove on the top surface of the lower template, and multiple blade forming holes are evenly distributed in a ring on the ceramic core disc. Multiple core post positioning holes are evenly distributed in a ring on the lower template, and the upper end of the ceramic core post passes through the positioning holes and extends into the blade forming hole of the ceramic core disc. The outer circumferential surface of the upper end of the ceramic core post is spaced apart from the inner surface of the blade forming hole. This invention can avoid defects such as excessive blade wall thickness, thus obtaining a qualified wax model.

Description

Technical Field

[0001] This invention relates to the field of high-temperature alloy investment casting technology, and in particular to a molding die for starting turbine wax molds. Background Technology

[0002] Starting turbine blades are a core component of an engine. They operate in high-temperature environments and are subjected to complex stress and strain, requiring them to possess high temperature resistance, strength, and creep resistance. As the performance requirements for aero engines continue to increase, the temperature resistance of existing high-temperature alloy materials has reached its limit. Changing the cooling structure of the blades and improving cooling efficiency have become goals pursued by engine designers.

[0003] The internal shape of hollow blades is extremely complex, requiring high dimensional accuracy and strict wall thickness. Traditional methods such as forging and electrochemical machining cannot achieve the expected performance requirements, and 3D printing cannot meet the dimensional accuracy requirements. Therefore, to obtain high-performance, high-precision hollow blades, the "investment casting + precision casting" technique can solve this problem. The general casting process for hollow blade products is as follows: preparing a ceramic core → preparing a wax model → preparing a mold shell → melting and pouring → post-processing.

[0004] Combination Figure 1 , Figure 2 The diagram shown is a structural schematic of a certain type of starting turbine. The blades on this starting turbine are hollow, and the key technology for precision investment casting of this starting turbine is the wax pattern preparation process.

[0005] Combination Figure 3 , Figure 4 The diagram shows a wax model structure for starting a 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 multiple 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. Three fan-shaped protrusions 104 are evenly distributed on the top surface of the disc body 100.

[0006] The difficulty in preparing the above-mentioned wax model lies in how to accurately position the ceramic core in the molding die, and how to ensure that the ceramic core is not displaced due to the impact of the wax material during the wax filling process, which would cause the blade wall thickness to exceed the tolerance, thus obtaining a qualified wax part. Summary of the Invention

[0007] The main objective of this invention is to provide a molding die for starting a turbine wax mold, which aims to solve the above-mentioned technical problems.

[0008] To achieve the above objectives, this invention proposes a molding die for starting a turbine wax mold, comprising a positioning plate, a lower template, an upper template, and a pressure plate arranged sequentially from bottom to top; an annular platform is provided at the center of the top surface of the positioning plate, and a core post socket is installed in the central countersunk hole of the annular platform; a plurality of core post insertion holes are evenly distributed in a ring on the core post socket, and a ceramic core post is vertically inserted into the core post insertion holes; the lower end face of the ceramic core post abuts against the top surface of the annular platform; a ceramic core disk is installed in the annular groove on the top surface of the lower template, and a plurality of blade forming holes are evenly distributed in a ring on the ceramic core disk; a plurality of core post positioning holes are evenly distributed in a ring on the lower template, and the upper end of the ceramic core post passes through the core post positioning hole and extends into the blade forming hole of the ceramic core disk; the outer peripheral surface of the upper end of the ceramic core post is spaced apart from the inner surface of the blade forming hole.

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

[0010] Preferably, an axial limiting notch is provided on the ceramic core column; two sliding grooves are provided on the positioning plate, and sliders are slidably installed on the sliding grooves. A semi-ring body is fixedly connected to the slider, and a snap-fit ​​flange is integrally formed on the inner hole surface of the semi-ring body; when the two sliders slide relative to each other on the sliding grooves, the two semi-ring bodies are spliced ​​into a complete ring, and the snap-fit ​​flange rests on the top surface of the core column socket and snaps into the axial limiting notch of the ceramic core column.

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

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

[0013] Preferably, three fan-shaped recesses are evenly distributed on the top wall of the cavity of the upper template for forming fan-shaped protrusions on the wax mold; an exhaust groove is provided on the top surface of the upper template; the exhaust groove and the fan-shaped recesses are connected by an exhaust hole, and a breathable plug is inserted into the exhaust hole.

[0014] Preferably, three fan-shaped holes are evenly distributed on the lower template, the positioning plate, and the core column socket for the inner sprue on the molding wax model.

[0015] Preferably, a base plate is spaced below the positioning plate, and two support plates are disposed between the base plate and the positioning plate; a pin passes through the base plate and support plates from bottom to top and is then inserted into the positioning plate; the molding die also includes an ejection mechanism for ejecting the molded wax model, the ejection mechanism including a combination plate and three arc-shaped top plates disposed on the combination plate; the upper end of the arc-shaped top plates extends into the fan-shaped hole of the positioning plate; the combination plate is disposed between the two support plates; a rotating shaft is inserted into both support plates, and a handle is disposed at one end of the rotating shaft; a cam is installed in the middle of the rotating shaft; the cam slides with the lower surface of the combination plate to drive the combination plate to move upward.

[0016] Preferably, the ejection mechanism further 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 before abutting against the lower end face 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 before abutting against the lower end face of the ceramic core plate; the number of the second ejector pins is four.

[0017] Preferably, the ejection mechanism further includes four guide posts and a central push rod installed on the assembly plate; the four guide posts are respectively installed at the four corners of the assembly plate, and the upper ends of the guide posts extend upward and are inserted into the guide holes of the positioning plate and the lower template; the upper end of the central push rod extends upward and passes through the central hole of the positioning plate, the core post socket, and the lower template in sequence; a spring is sleeved on the guide post, and the spring is located between the assembly plate and the positioning plate; when the ejection mechanism is in the non-ejection state, the top surfaces of the guide posts and the central push 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 molding die provided in this invention, a ceramic core is used to form the inner hole of the blade on the wax model. The gap between the outer peripheral surface of the upper end of the ceramic core and the inner hole surface of the blade forming hole on the ceramic core plate is used to ensure the wall thickness of the blade on the wax model. The lower end and middle part of the ceramic core are positioned by using the core insertion hole on the core socket and the core positioning hole on the lower template, respectively. The top surface of the annular platform is used to axially limit the ceramic core, ensuring the accuracy of the position of the ceramic core. At the same time, the ceramic core plate is installed and positioned by using the annular groove on the top surface of the lower template, ensuring the relative position of the ceramic core plate and the ceramic core. This ensures that a uniform gap is formed between the outer peripheral surface of the upper end of the ceramic core and the inner hole surface of the blade forming hole, thereby ensuring that the blade wall thickness on the wax model is uniform.

[0020] (2) In this invention, by setting 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 by the wax inlet groove through three connecting grooves. When wax is injected, the wax material enters the cavity of the upper template through the three connecting grooves, which does not cause impact on the ceramic core column and can prevent the ceramic core column from being displaced or broken.

[0021] (3) In the molding die provided by the present invention, by setting an ejection mechanism, it is convenient to eject the molded wax model. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the starting turbine.

[0024] Figure 2 for Figure 1 A schematic diagram after being cut open along the middle AA section;

[0025] Figure 3 Schematic diagram of the wax mold structure for starting the turbine Figure 1 ;

[0026] Figure 4 Schematic diagram of the wax mold structure for starting the turbine Figure 2 ;

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

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

[0029] Figure 7 This is an exploded view of a portion of the structure of the forming mold provided by the present invention;

[0030] Figure 8 This is a schematic diagram of the internal structure of the forming mold provided by the present invention;

[0031] Figure 9 This is a schematic diagram of the ceramic core post in this invention;

[0032] Figure 10 This is a partial structural schematic diagram of the ejection mechanism in this invention;

[0033] Figure 11 This is a schematic diagram of the mounting structure of the rotating shaft and cam in this invention;

[0034] Figure 12 This is a schematic diagram of the upper template in this invention. Figure 1 ;

[0035] Figure 13 This is a schematic diagram of the upper template in this invention. Figure 2 ;

[0036] Figure 14 This is a schematic diagram of the lower template in this invention. Figure 1 ;

[0037] Figure 15 This is a schematic diagram of the lower template in this invention. Figure 2 ;

[0038] Figure 16 This is a schematic diagram of the positioning plate in this invention.

[0039] Explanation of reference numerals: 1. Positioning plate; 1a. Annular platform; 1b. Slide groove; 2. Lower template; 2a. Core column positioning hole; 2b. Positioning notch; 3. Upper template; 3a. Fan-shaped recess; 3b. Vent hole; 3c. Vent plug; 3d. Vent groove; 4. Pressure plate; 5. Core column socket; 5a. Core column insertion hole; 6. Ceramic core column; 6a. Axial limiting notch; 7. Ceramic core plate; 7a. Blade forming hole; 7b. Positioning protrusion; 8. Slider; 8a. Protrusion; 9. Semi-annular body; 9a. Clamping flange plate; 10. Wedge block; 11. Wax inlet groove; 12. Wax injection port; 13. Wax inlet port; 14. Bottom 15. Plate; 16. Support plate; 17. Pin; 18. Combination plate; 19. Upper plate; 20. Lower plate; 21. Arc-shaped top plate; 22. Rotating shaft; 23. Cam; 24. Handle; 25. First ejector pin; 26. Second ejector pin; 27. Guide post; 28. Central ejector rod; 29. ​​Baffle; 20. Spring; 21. First screw; 32. Second screw; 33. Third screw; 34. Fourth screw; 35. Fifth screw; 100. Lifting ring; 101. Handle; 102. Support post; 103. Disc; 104. Ring; 105. Blade; 106. Ingate; 107. Fan-shaped protrusion. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

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

[0042] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0043] Combination Figure 1 , Figure 2The image shows a schematic diagram of a certain type of starting turbine. The blades of this starting turbine are hollow, and the key technology in the precision investment casting of this starting turbine is the wax pattern preparation process. (Combined with...) Figure 3 , Figure 4 The diagram shows a schematic of a wax model for a starting turbine. The wax model comprises a disc 100 and an annular body 101. The disc 100 and the annular body 101 are connected by multiple 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 100. After the wax model is used to cast the part, the three fan-shaped protrusions 104 serve as clamping points for machining the part.

[0044] Combination Figures 5 to 16 The image shows a specific embodiment of a molding die for a starting turbine wax mold provided by the present invention. The molding die includes a positioning plate 1, a lower template 2, an upper template 3, and a pressure plate 5 arranged sequentially from bottom to top. An annular platform 1a is provided at the center of the top surface of the positioning plate 1, and a core post socket 5 is installed in the central countersunk hole of the annular platform 1a. A plurality of core post insertion holes 5a are evenly distributed in a ring on the core post socket 5, and a ceramic core post 6 is vertically inserted into the core post insertion hole 5a. The lower end face of the ceramic core post 6 abuts against the top surface of the annular platform 1a. A ceramic core disk 7 is installed in the annular countersunk groove on the top surface of the lower template 2, and a plurality of blade forming holes 7a are evenly distributed in a ring on the ceramic core disk 7. A plurality of core post positioning holes 2a are evenly distributed in a ring on the lower template 2, and the upper end of the ceramic core post 6 extends through the core post positioning hole 2a and into the blade forming hole 7a of the ceramic core disk 7. The outer peripheral surface of the upper end of the ceramic core post 6 is spaced apart from the inner surface of the blade forming hole 7a. The inner hole of the blade 102 on the wax model is formed by using a ceramic core post 6. The gap between the outer peripheral surface of the upper end of the ceramic core post 6 and the inner hole surface of the blade forming hole 7a on the ceramic core plate 7 is used to ensure the wall thickness of the blade 102 on the wax model.

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

[0046] Combination Figure 7 , Figure 14As shown, 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 groove of the lower template 2; the positioning protrusion 7b is stuck in the positioning notch 2b, which plays a circumferential limiting role for the ceramic core disk 7 and prevents 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 pillar 6; two sliding grooves 1b are provided on the positioning plate 1, and a slider 8 is slidably installed on the sliding groove 1b. A semi-ring 9 is fixed to the slider 8, and a retaining flange 9a is integrally formed on the inner hole surface of the semi-ring 9; when the two sliders 8 slide relative to each other on the sliding grooves, the two semi-rings 9 are spliced ​​into a complete ring, and the retaining flange 9a rests on the top surface of the core pillar socket 5, which plays a role in axially pressing the core pillar socket 5. At the same time, the retaining flange 9a is engaged in the axial limiting notch 6a of the ceramic core pillar 6, which can prevent the ceramic core pillar 6 from axially moving. A handle 34 is provided on the slider 8, which facilitates pulling the slider 8 outward after the mold is opened.

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

[0049] Combination Figure 12 , Figure 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 cavity of the upper template 3 is connected to the wax inlet grooves 11 through three connecting grooves 13; the wax inlet grooves 11 are semi-circular in shape and are concentrically arranged with the cavities of the lower template 2 and the upper template 3, and are located outside the cavities of the lower template 2 and the upper template 3. In this embodiment, the cavity of the upper template 3 is used to form the disc body 100 of the wax model, the annular groove of the lower template 2 is a stepped groove structure, the ceramic core disc 7 is installed on the stepped surface of the stepped groove, and the lower part of the stepped groove is used to form the annular body 101 of the wax model. During wax injection, the wax material enters the cavity of the upper mold plate 3 through three connecting grooves 13, which diverts the wax material and does not impact the ceramic core column 6, thus preventing the ceramic core column 6 from shifting or breaking.

[0050] Combination Figure 12 , Figure 13 As shown, three fan-shaped recesses 3a are evenly distributed on the top wall of the cavity of the upper mold plate 3 for forming the fan-shaped protrusions 104 on the wax model; an venting groove 3d is provided on the top surface of the upper mold plate 3; the venting groove 3d and the fan-shaped recesses 3a are connected by an venting hole 3b, and a vent plug 3c is inserted into the venting hole 3b. By providing the venting hole 3b, the molding die plays a role in venting during wax injection.

[0051] Combination Figure 6 , Figure 7 As shown, three fan-shaped holes are evenly distributed on the lower template 2, the positioning plate 1, and the core column socket 5 for the inner sprue 103 on the molding wax model.

[0052] Combination Figure 6 , Figure 8 As shown, a base plate 14 is spaced below the positioning plate 1, and two support plates 15 are positioned between the base plate 14 and the positioning plate 1. A pin 16 passes through the base plate 14 and the support plates 15 from bottom to top and is inserted into the positioning plate 1. Two baffles 26 are also positioned between the base plate 14 and the positioning plate 1. A first screw 28 connects and fixes the base plate 14, baffles 26, and positioning plate 1. Specifically, the first screw 28 passes through the base plate 14 and baffles 26 from bottom to top and is screwed onto the positioning plate 1. The base plate 14 and the baffles 26 are also fastened together by multiple 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 multiple third screws 30. The pressure plate 4 and the upper template 3 are connected by multiple fourth screws 31. In this embodiment, lifting rings 33 are respectively provided on the end faces of both ends of the upper template 3. When lifting the entire forming mold, it is necessary to fix the assembly formed by the pressure plate 4 and the upper template 3 onto the lower template 2. At this time, fifth screws 32 can be used to pass through the pressure plate 4 and the upper template 3 from top to bottom and then screw them onto the lower template 2.

[0054] Combination Figure 6 , Figure 8 , Figure 10 and Figure 11As shown, the molding die also includes an ejection mechanism for ejecting the molded wax model. The ejection mechanism includes a combination plate 17 and three arc-shaped top plates 18 disposed on the combination plate 17. The upper ends of the arc-shaped top plates 18 extend into the fan-shaped holes of the positioning plate 1. The combination plate 17 is disposed between two support plates 15. A rotating shaft 19 is inserted into both support plates 15, and a handle 21 is provided at one end of the rotating shaft 19. A cam 20 is installed in the middle of the rotating shaft 19. The cam 20 slides with the lower surface of the combination plate 17 to drive the combination plate 17 to move upward. When ejecting the molded wax model, the handle 21 is turned, causing the cam 20 to drive the combination plate 17 to move upward. The arc-shaped top plates 18 then press against the inner sprue 103 of the wax model, thus ejecting the wax model.

[0055] Combination Figure 6 , Figure 8 and Figure 10 To ensure effective ejection, the ejection mechanism further includes 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 before abutting against the lower end face of the ceramic core column 6. The number of first ejector pins 22 is equal to the number of 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 template 2 in sequence before abutting against the lower end face of the ceramic core plate 7. There are four second ejector pins 23. When ejecting the molded wax model, the first ejector pin 22 can abut against the ceramic core column 6, and the second ejector pin 23 can abut against the ceramic core plate 7, together ejecting the molded wax model.

[0056] Furthermore, the ejection mechanism also includes four guide pillars 24 and a central ejector rod 25 mounted on the assembly plate 17. The four guide pillars 24 are respectively installed at the four corners of the assembly plate 17, with the upper ends of the guide pillars 24 extending upward and 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 central holes of the positioning plate 1, the core pillar socket 5, and the lower template 2 in sequence. A spring 27 is fitted on the guide pillars 24, and the spring 27 is located between the assembly plate 17 and the positioning plate 1. When the ejection mechanism is in the non-ejection state, the top surfaces of the guide pillars 24 and the central ejector rod 25 are flush with the top surface of the lower template 2. The guide pillars 24 provide guidance, and the spring 27 provides buffering to prevent excessive ejection speed. When ejecting the molded wax model, the central ejector rod 25 can be fixed on the disc body 100 of the wax model.

[0057] In this embodiment, the combined plate 17 includes an upper plate 17a and a lower plate 17b. The lower ends of the arc-shaped top plate 18, the first ejector pin 22, the second ejector pin 23, the guide post 24, and the central ejector rod 25 are all equipped with axial limiting heads, and the axial limiting heads are all installed on the stepped holes of the upper plate 17a and pressed by the lower plate 17b. The upper plate 17a and the lower plate 17b are fastened together by screws.

[0058] Combination Figure 8 As shown, multiple support columns 35 are installed on the top surface of the base plate 14. 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 merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A molding die for a starting turbine wax mold, characterized in that, It includes a positioning plate (1), a lower template (2), an upper template (3), and a pressure plate (5) arranged sequentially from bottom to top; A ring platform (1a) is provided at the center of the top surface of the positioning plate (1), and a core post socket (5) is installed on the central countersunk hole of the ring platform (1a); a plurality of core post holes (5a) are evenly distributed in a ring on the core post socket (5), and a ceramic core post (6) is vertically inserted into the core post hole (5a); the lower end face of the ceramic core post (6) abuts against the top surface of the ring platform (1a); A ceramic core plate (7) is installed at the annular groove on the top surface of the lower template (2), and multiple blade forming holes (7a) are evenly distributed in an annular pattern on the ceramic core plate (7). Multiple core column positioning holes (2a) are evenly distributed in a ring on the lower template (2). The upper end of the ceramic core column (6) passes through the core column positioning hole (2a) and 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). Wax inlet grooves (11) are provided on the upper surface of the lower template (2) and the lower surface of the upper template (3); wax injection ports (12) are 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 cavity of the upper template (3) is connected to the wax inlet grooves (11) through three connecting grooves (13); the wax inlet grooves (11) are semi-circular in shape and are concentrically arranged with the cavities of the lower template (2) and the upper template (3), and are located outside the cavities of the lower template (2) and the upper template (3).

2. The molding die for a starting turbine wax mold as described 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 groove of the lower template (2); the positioning protrusion (7b) is engaged in the positioning notch (2b).

3. The molding die for a starting turbine wax mold as described in claim 1, characterized in that, An axial limiting notch (6a) is provided on the ceramic core column (6); two sliding grooves (1b) are provided on the positioning plate (1), and a slider (8) is slidably installed on the sliding groove (1b). A semi-ring body (9) is fixed on the slider (8), and a snap-fit ​​flange plate (9a) is integrally formed on the inner hole surface of the semi-ring body (9). When the two sliders (8) slide close to each other on the groove, the two semi-rings (9) are spliced ​​into a whole ring, the snap-fit ​​plate (9a) rests on the top surface of the core socket (5), and the snap-fit ​​plate (9a) is snapped into the axial limiting notch (6a) of the ceramic core (6).

4. The molding die for a starting turbine wax mold as described in claim 3, characterized in that, A protrusion (8a) is integrally formed on the top surface of the slider (8), and an inclined surface is provided on the protrusion (8a); a wedge block (10) is connected to the upper template (3) by screws; a square hole (2c) is provided on the lower template (2); when the upper template (3) and the lower template (2) are closed, the wedge block (10) passes through the square hole (2c), and the inclined surface of the wedge block (10) cooperates with the inclined surface of the protrusion (8a) to push the two sliders (8) to slide inward in the groove.

5. The molding die for a starting turbine wax mold as described in claim 1, characterized in that, Three fan-shaped recesses (3a) are evenly distributed on the top wall of the cavity of the upper template (3) for forming 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) and the fan-shaped recesses (3a) are connected by an exhaust hole (3b), and a breather plug (3c) is inserted in the exhaust hole (3b).

6. The molding die for a starting turbine wax mold as described in claim 1, characterized in that, Three fan-shaped holes are evenly distributed on the lower template (2), positioning plate (1), and core column socket (5) for the inner sprue (103) on the molding wax model.

7. The molding die for a starting turbine wax mold as described in claim 6, characterized in that, A base plate (14) is provided at intervals below the positioning plate (1), and two support plates (15) are provided between the base plate (14) and the positioning plate (1); a pin (16) passes through the base plate (14) and the support plate (15) from bottom to top and is then inserted into the positioning plate (1); The molding die also includes an ejection mechanism for ejecting the molded wax model. The ejection mechanism includes a combination plate (17) and three arc-shaped top plates (18) set 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 set between two support plates (15). A rotating shaft (19) is inserted on both support plates (15). A handle (21) is set at one end of the rotating shaft (19). A cam (20) is installed in the middle of the rotating shaft (19). The cam (20) slides with the lower surface of the combination plate (17) to drive the combination plate (17) to move upward.

8. The molding die for a starting turbine wax mold as described in claim 7, characterized in that, 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 face of the ceramic core column (6); the number of the first ejector pins (22) is equal to the number of 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 template (2) in sequence before abutting against the lower end face of the ceramic core plate (7); there are four second ejector pins (23).

9. The molding die for a starting turbine wax mold as described in claim 8, characterized in that, The ejection mechanism also includes four guide columns (24) and a central push rod (25) installed on the combined plate (17); the four guide columns (24) are respectively installed at the four corners of the combined plate (17), and the upper end of the guide column (24) extends upward and is inserted into the guide hole of the positioning plate (1) and the lower template (2); The upper end of the center top rod (25) extends upward and passes through the center hole of the positioning plate (1), the core column socket (5), and the lower template (2) in sequence; A spring (27) is fitted on the guide post (24), and the spring (27) is located between the combined plate (17) and the positioning plate (1); When the ejection mechanism is in the non-ejection state, the top surfaces of the guide column (24) and the central push rod (25) are flush with the top surface of the lower template (2).

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