Anti-deformation structure of cylindrical titanium alloy casting wax mould pouring system

Abstract

The invention relates to the technical field of titanium alloy investment casting, in particular to an anti-deformation structure of a cylindrical titanium alloy casting wax mold pouring system. Comprising a wax mold, a vertical sprue is arranged in the center of the wax mold, and a core rod is embedded in the center of the sprue; the lower end face of the wax mold is connected with a cross gate through a plurality of ingates; the lower end of the straight pouring gate is used for connecting the center of the transverse pouring gate; a plurality of reinforcing rings are arranged in the wax mold at intervals up and down, and the outer peripheral surfaces of the reinforcing rings are connected with the inner wall of the wax mold through a plurality of connecting ribs. A core rod is embedded in the center of the sprue, and the core rod plays a role in reinforcing the sprue and is also used for connecting and fixing a tool at the same time. The plurality of reinforcing rings are arranged in the wax mould at intervals up and down, and the peripheral surfaces of the reinforcing rings are connected with the inner wall of the wax mould through the plurality of connecting ribs, so that the axial deformation and the distortion deformation of the wax mould assembly in the coating, smelting and pouring processes can be effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloy investment casting, in particular to an anti-deformation structure of a wax mold pouring system for a cylindrical titanium alloy casting. Background Art

[0002] Combination Figure 1 The figure shows the structure of a large cylindrical titanium alloy investment casting. The weight of the casting is about 90Kg, the wall thickness is 6.5mm, the maximum outer diameter of the casting is φ900mm, the minimum inner diameter is φ800mm, and the height is 500mm. The casting is cylindrical as a whole, with a trumpet-shaped diameter expansion at the tail end, a large lower and small upper structure, a smooth outer contour, and a stepped expansion of the inner cavity. There are 20 ribs evenly distributed on the lower inner wall, a rib around the waist inner cavity, and 8 12×12mm square bosses on the ribs.

[0003] After being pressed into a wax mold, the pouring system and coating are combined to prepare the membrane shell, and then pouring is carried out.

[0004] In the traditional pouring system structure, the wax mold is placed with the large diameter facing downward and the small diameter facing upward. There is no supporting structure in the middle part, and there is no axial fixing device outside the pouring system. In the process of preparing the pouring system by wax mold assembly and the process of preparing the membrane shell by coating, radial deformation and axial deformation are easy to occur. In the process of smelting and pouring, centrifugal pouring is used. Due to the high centrifugal speed, no axial fixing device is set when preparing the pouring system, which is easy to cause deformation and damage. In the pouring process, the pouring system design is unreasonable, and the casting is prone to deformation or cracking due to the influence of thermal stress. Summary of the invention

[0005] The main purpose of the present invention is to provide an anti-deformation structure of a wax mold pouring system for a cylindrical titanium alloy casting, aiming to solve the above technical problems.

[0006] To achieve the above-mentioned objectives, the present invention proposes an anti-deformation structure of a wax mold casting system for a cylindrical titanium alloy casting, comprising a wax mold, a vertical sprue is arranged at the center of the wax mold, and a core rod is embedded in the center of the sprue; a cross runner is connected to the lower end surface of the wax mold through a plurality of inner runners; the lower end of the sprue is used for the center connection of the cross runner; a plurality of reinforcement rings are arranged at upper and lower intervals inside the wax mold, and the outer peripheral surface of the reinforcement ring is connected to the inner wall of the wax mold through a plurality of connecting ribs.

[0007] Preferably, the anti-deformation structure also includes a fixing tool consisting of an upper fixing plate, a lower fixing plate and a pull rod; the wax mold, the ingrowth, the cross runner and the straight runner together constitute a wax mold assembly; an annular riser is arranged on the top of the wax mold; the wax mold assembly is placed on the lower fixing plate, the upper fixing plate is arranged above the wax mold assembly, and the upper end of the core rod passes through the upper fixing plate and is screwed with a nut; the upper fixing plate and the lower fixing plate are connected by a plurality of pull rods; a plurality of tightening screws are arranged on the upper fixing plate, and the lower ends of the tightening screws are tightened on the top surface of the annular riser.

[0008] Preferably, the upper fixing plate is composed of a disc body and a plurality of strip plates, and the plurality of strip plates are integrally formed on the outer circumference of the disc body in a star-shaped shape, and the lower fixing plate includes an annular body and a plurality of ear plates integrally formed on the outer circumference of the annular body.

[0009] Preferably, an arc-shaped reinforcing plate is provided between two adjacent strip plates.

[0010] Preferably, the number of the ear plates is the same as the number of the strip plates, and the upper and lower positions of the strip plates and the ear plates correspond to each other; a first strip-shaped hole is provided on the strip plate; a second strip-shaped hole is provided on the ear plate; the upper and lower ends of the pull rod are respectively installed in the first strip-shaped hole and the second strip-shaped hole; the tightening screw is installed in the first strip-shaped hole.

[0011] Preferably, a plurality of cushion blocks are provided between the lower fixing plate and the runner.

[0012] Preferably, the cross runner includes multiple arc bars and multiple circular bodies; the multiple arc bars are evenly distributed in a ring shape, and the inner ends of the multiple arc bars are gathered together and connected to the lower end of the straight runner; the multiple circular bodies and the multiple arc bars are an integrally formed structure; the corners at the intersection of the arc bars and the circular bodies adopt R6 smooth transition, and the corners at the intersection of two adjacent arc bars adopt R6 smooth transition.

[0013] Preferably, the inner runner is a truncated pyramid structure, and the side slope of the truncated pyramid is 9 degrees; the size of the large end of the truncated pyramid is 40 mm×100 mm.

[0014] Preferably, the large end of the ingrate is connected to the runner, and the small end of the ingrate is connected to the wax mold.

[0015] Preferably, two adjacent upper and lower reinforcement rings are connected via a plurality of struts.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0017] (1) In the present invention, a core rod is embedded in the center of the sprue. The core rod serves to strengthen the sprue and is also used to connect and fix the tooling.

[0018] (2) By arranging a plurality of reinforcing rings at intervals in the upper and lower parts of the wax mold, and connecting the outer peripheral surface of the reinforcing rings to the inner wall of the wax mold through a plurality of connecting ribs, the reinforcing rings can effectively prevent the axial deformation and torsional deformation of the wax mold assembly during the process of preparing the membrane shell, melting and pouring the coating.

[0019] (3) An annular riser is provided at the top of the wax mold to supplement the shrinkage of the casting after pouring is completed, thereby avoiding the occurrence of loose defects.

[0020] (4) In the present invention, the wax mold assembly is installed in a fixed fixture, and the fixed fixture is an upper fixed plate, a lower fixed plate and a pull rod to form a stable frame structure, which can further prevent the wax mold assembly from axial deformation and twisting deformation during the coating, melting and pouring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the structure of a cylindrical titanium alloy investment casting;

[0023] Figure 2 It is a schematic diagram of a wax mold assembly composed of a wax mold, an ingates, a runner and a sprue in the present invention;

[0024] Figure 3 It is a schematic diagram of the component structure formed by the horizontal runner and the straight runner in the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the wax model assembly installed in the fixed tooling in the present invention.

[0026] Explanation of the accompanying drawings: 1. sprue; 2. runner; 2a. arc strip; 2b. annular body; 3. wax mold; 4. reinforcement ring; 5. annular riser; 6. ingrown; 7. connecting ribs; 8. core rod; 9. upper fixing plate; 9a. disc body; 9b. spoke plate; 9c. arc reinforcement plate; 9d. first strip-shaped hole; 10. lower fixing plate; 10a. annular body; 10b. ear plate; 10c. second strip-shaped hole; 11. tightening screw; 12. nut; 13. spacer; 14. support. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Combination Figures 2 to 4 As shown, an anti-deformation structure of a wax mold casting system for a cylindrical titanium alloy casting comprises a wax mold 3, a vertical sprue 1 is arranged at the center of the wax mold 3, and a core rod 8 is embedded in the center of the sprue 1; a cross runner 2 is connected to the lower end surface of the wax mold 3 through a plurality of ingates 6; the lower end of the sprue 1 is used for the center connection of the cross runner 2; a plurality of reinforcement rings 4 are arranged at upper and lower intervals inside the wax mold 3, and the outer peripheral surface of the reinforcement ring 4 is connected to the inner wall of the wax mold 3 through a plurality of connecting ribs 7.

[0031] Combination Figure 4 As shown, the anti-deformation structure also includes a fixing tool consisting of an upper fixing plate 9, a lower fixing plate 10 and a pull rod 11; the wax mold 3, the ingrowth 6, the cross runner 2 and the straight runner 1 together constitute a wax mold assembly; an annular riser 5 is arranged on the top of the wax mold 3; the wax mold assembly is placed on the lower fixing plate 10, the upper fixing plate 9 is arranged above the wax mold assembly, and the upper end of the core rod 8 passes through the upper fixing plate 9 and is screwed with a nut 12; the upper fixing plate 9 and the lower fixing plate 10 are connected by a plurality of pull rods 11; a plurality of tightening screws 11 are arranged on the upper fixing plate 9, and the lower ends of the tightening screws 11 are tightened on the top surface of the annular riser 5.

[0032] Furthermore, the upper fixing plate 9 is composed of a disc body 9a and a plurality of strip plates 9b, and the plurality of strip plates 9b are integrally formed on the outer circumference of the disc body 9a in a star-shaped manner, and the lower fixing plate 10 includes an annular body 10a and a plurality of ear plates 10b integrally formed on the outer circumference of the annular body 10a. The above structure can effectively reduce the weight of the upper fixing plate 9 and the lower fixing plate 10. An arc-shaped reinforcing plate 9c is arranged between two adjacent strip plates 9b to play a reinforcing role.

[0033] Combination Figure 4 As shown, the number of the ear plates 10b is the same as the number of the strip plates 9b, and the upper and lower positions of the strip plates 9b and the ear plates 10b correspond; a first strip-shaped hole 9d is provided on the strip plate 9b; a second strip-shaped hole 10c is provided on the ear plate 10b; the upper and lower ends of the pull rod 11 are respectively installed in the first strip-shaped hole 9d and the second strip-shaped hole 10c, so as to facilitate the adjustment of the radial position of the pull rod 11, so that the fixing fixture can clamp wax mold assemblies of different diameters. The tightening screw 11 is installed in the first strip-shaped hole 9d, so as to facilitate the adjustment of the radial position of the tightening screw 11, so as to facilitate tightening on the annular riser 5.

[0034] Combination Figure 4 As shown, a plurality of pads 13 are provided between the lower fixing plate 10 and the runner 2. By providing the pads 13, direct contact between the lower fixing plate 10 and the runner 2 is avoided, so as to facilitate the subsequent operation of preparing the membrane shell with the coating.

[0035] Combination Figure 3 As shown, the cross runner 2 includes multiple arc strips 2a and multiple circular ring bodies 2b; the multiple arc strips 2a are evenly distributed in a ring shape, and the inner ends of the multiple arc strips 2a are gathered together and connected to the lower end of the straight runner 1; the multiple circular ring bodies 2b and the multiple arc strips 2a are an integrally formed structure; the corners at the intersection of the arc strips 2a and the circular ring bodies 2b adopt R6 smooth transition, and the corners at the intersection of two adjacent arc strips 2a adopt R6 smooth transition.

[0036] In this embodiment, the ingrate 6 is a truncated pyramid structure, the side slope of the truncated pyramid is 9 degrees, and the large end size of the truncated pyramid is 40mm×100mm. The large end of the ingrate 6 is connected to the runner 2, and the small end of the ingrate 6 is connected to the wax mold 3.

[0037] Combination Figure 2 As shown, in order to further increase the stability of the reinforcement ring 4 , two adjacent reinforcement rings 4 are connected by a plurality of pillars 14 .

[0038] The anti-deformation structure provided in this embodiment is manufactured according to the following process steps:

[0039] 1. Making a sprue 1 with a core rod 8 inside: The sprue 1 has a size of φ120 mm and a height of 700 mm. The core rod 8 serves to strengthen the sprue 1 and is also used to connect and fix the tooling.

[0040] 2. Making the runner 2: The maximum diameter of the bottom of the wax mold 3 is φ900 mm. Therefore, when making the runner 2, the outer diameter of the outermost annular body 2b is set to φ950 mm.

[0041] 3. Pressing wax pattern 3, reinforcement ring 4 and annular riser 5: There are two reinforcement rings 4, one with an outer diameter of φ780mm and the other with an outer diameter of φ840mm; the outer diameter of annular riser 5 is φ840mm. The reinforcement ring 4 can effectively prevent the axial deformation and twisting deformation of the wax pattern assembly during the assembly, coating, smelting and pouring process. The function of the annular riser 5 is to supplement the shrinkage of the casting after pouring is completed to avoid the occurrence of loose defects.

[0042] 4. Making the ingrate 6: The ingrate 6 is a truncated pyramid structure, and the side slope of the truncated pyramid is 9 degrees; the size of the large end of the truncated pyramid is 40 mm×100 mm.

[0043] 5. Making the fixing tool: The fixing tool is composed of an upper fixing plate 9, a lower fixing plate 10 and a pull rod 11.

[0044] 6. Combination of the pouring system: After checking that the surface quality of the wax mold 3 meets the requirements of the process regulations, the pouring system is combined. Specifically, the steps include:

[0045] ① Connect the sprue 1 and the runner 2 together;

[0046] ② Connect the wax mold 3 with the reinforcement ring 4 and the annular riser 5. The two reinforcement rings 4 are placed in the inner cavity of the wax mold 3 with an upper and lower interval. The outer peripheral surface of each reinforcement ring 4 is connected to the inner wall of the wax mold 3 by four connecting ribs 7. The upper and lower reinforcement rings 4 are connected by four pillars 14. The reinforcement rings 4, the pillars 14 and the connecting ribs 7 together form a stable frame structure to prevent axial deformation and torsional deformation of the wax mold assembly during the assembly, coating, melting and pouring processes.

[0047] ③ The assembly formed by the sprue 1 and the runner 2 is connected to the wax mold 3 through the ingrowth 6. The 12 ingrowths 6 are evenly connected to the large end surface of the wax mold 3. The small end of the ingrowth 6 is connected to the large end surface of the wax mold 3, and the large end of the ingrowth 6 is connected to the runner 2. At this point, the wax mold 3, the ingrowth 6, the runner 2 and the sprue 1 together constitute a wax mold assembly.

[0048] 7. Install the wax mold assembly in a fixed fixture. The function of the fixed fixture is to prevent the wax mold assembly from axial deformation and twisting deformation during the coating preparation membrane shell, melting and pouring process.

[0049] 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. An anti-deformation structure of a wax mold pouring system for a cylindrical titanium alloy casting, comprising a wax mold (3), characterized in that: A vertical sprue (1) is arranged at the center of the wax mold (3), and a core rod (8) is embedded in the center of the sprue (1); The lower end surface of the wax mold (3) is connected to a runner (2) via a plurality of endocastors (6); the lower end of the sprue (1) is used for the center connection of the runner (2); A plurality of reinforcement rings (4) are arranged at intervals in the upper and lower parts of the wax mold (3), and the outer peripheral surfaces of the reinforcement rings (4) are connected to the inner walls of the wax mold (3) via a plurality of connection ribs (7).

2. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 1, characterized in that: It also includes a fixing fixture consisting of an upper fixing plate (9), a lower fixing plate (10) and a pull rod (11); the wax mold (3), the ingrowth (6), the runner (2) and the sprue (1) together constitute a wax mold assembly; an annular riser (5) is provided on the top of the wax mold (3); The wax model assembly is placed on a lower fixing plate (10), the upper fixing plate (9) is arranged above the wax model assembly, and the upper end of the core rod (8) passes through the upper fixing plate (9) and is screwed with a nut (12); The upper fixing plate (9) and the lower fixing plate (10) are connected via a plurality of tie rods (11); a plurality of tightening screws (11) are provided on the upper fixing plate (9), and the lower ends of the tightening screws (11) are tightened against the top surface of the annular riser (5).

3. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 2, characterized in that: The upper fixing plate (9) is composed of a disc body (9a) and a plurality of strip plates (9b), wherein the plurality of strip plates (9b) are integrally formed on the outer peripheral surface of the disc body (9a) in a star-shaped manner, and the lower fixing plate (10) comprises an annular body (10a) and a plurality of ear plates (10b) integrally formed on the outer peripheral surface of the annular body (10a).

4. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 3, characterized in that: An arc-shaped reinforcing plate (9c) is arranged between two adjacent strip plates (9b).

5. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 3, characterized in that: The number of the ear plates (10b) is the same as the number of the strip plates (9b), and the upper and lower positions of the strip plates (9b) and the ear plates (10b) correspond to each other; a first strip-shaped hole (9d) is provided on the strip plate (9b); a second strip-shaped hole (10c) is provided on the ear plate (10b); the upper and lower ends of the pull rod (11) are respectively installed in the first strip-shaped hole (9d) and the second strip-shaped hole (10c); the tightening screw (11) is installed in the first strip-shaped hole (9d).

6. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 2, characterized in that: A plurality of cushion blocks (13) are arranged between the lower fixing plate (10) and the runner (2).

7. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 1, characterized in that: The cross runner (2) comprises a plurality of arc-shaped strips (2a) and a plurality of annular bodies (2b); the plurality of arc-shaped strips (2a) are evenly distributed in an annular shape, and the inner ends of the plurality of arc-shaped strips (2a) are connected to the lower end of the straight runner (1) after being brought together; the plurality of annular bodies (2b) and the plurality of arc-shaped strips (2a) are an integrally formed structure; each corner at the intersection of the arc-shaped strips (2a) and the annular bodies (2b) adopts an R6 smooth transition, and the corner at the intersection of two adjacent arc-shaped strips (2a) adopts an R6 smooth transition.

8. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 1, characterized in that: The inner runner (6) is a truncated pyramid structure, and the side slope of the truncated pyramid is 9 degrees; the size of the large end of the truncated pyramid is 40mm×100mm.

9. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 8, characterized in that: The large end of the ingrate (6) is connected to the runner (2), and the small end of the ingrate (6) is connected to the wax mold (3).

10. The anti-deformation structure of the wax mold pouring system for cylindrical titanium alloy castings according to claim 1, characterized in that: The upper and lower adjacent reinforcement rings (4) are connected via a plurality of pillars (14).

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