A deformation-resistant structure for a cylindrical titanium alloy casting wax pattern pouring system

Abstract

This invention relates to the field of titanium alloy investment casting technology, and more particularly to an anti-deformation structure for a cylindrical titanium alloy casting wax pattern casting system. It includes a wax pattern with a vertical sprue at its center, and a mandrel embedded in the center of the sprue. A horizontal sprue is connected to the lower end face of the wax pattern via multiple ingates. The lower end of the sprue serves as the center connection for the horizontal sprue. Multiple reinforcing rings are spaced vertically inside the wax pattern, and the outer circumference of the reinforcing rings is connected to the inner wall of the wax pattern by multiple connecting ribs. The mandrel embedded in the center of the sprue serves to reinforce the sprue and also connects to and fixes the tooling. By spaced vertically within the wax pattern with multiple reinforcing rings, and by connecting the outer circumference of the reinforcing rings to the inner wall of the wax pattern via multiple connecting ribs, axial and torsional deformation of the wax pattern assembly can be effectively prevented during coating, melting, and casting processes.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy investment casting technology, and in particular to an anti-deformation structure for a cylindrical titanium alloy casting wax pattern pouring system. Background Technology

[0002] Combination Figure 1 The diagram shows the structure of a large cylindrical titanium alloy investment casting. The casting weighs approximately 90 kg, has a wall thickness of 6.5 mm, a maximum outer diameter of φ900 mm, a minimum inner diameter of φ800 mm, and a height of 500 mm. The casting is cylindrical with a flared, widening diameter at the rear, exhibiting a bottom-to-top shape. The outer contour is smooth, and the inner cavity has a stepped diameter expansion. Twenty ribs are evenly distributed on the lower inner wall, and a rib surrounds the waist cavity, with eight 12×12 mm square bosses on the rib.

[0003] After pressing into a wax mold, the gating system and coating are assembled and the film shell is prepared, and then the casting is carried out.

[0004] In traditional gating system structures, the wax model is placed with the larger diameter facing down and the smaller diameter facing up, without a supporting structure in the middle. There is also no axial fixing device on the outside of the gating system. This makes radial and axial deformation prone to occur during the wax model assembly and coating preparation processes. Furthermore, centrifugal casting is used during the melting and pouring process. Due to the high centrifugal speed, and the lack of axial fixing devices during gating system preparation, deformation and damage are likely to occur. During the pouring process, an improperly designed gating system, influenced by thermal stress, can easily lead to deformation or cracking in the casting. Summary of the Invention

[0005] The main objective of this invention is to propose an anti-deformation structure for a cylindrical titanium alloy casting wax mold pouring system, aiming to solve the aforementioned technical problems.

[0006] To achieve the above objectives, this invention proposes an anti-deformation structure for a cylindrical titanium alloy casting wax model pouring system, comprising a wax model, a vertical sprue at the center of the wax model, a mandrel embedded in the center of the sprue; a horizontal sprue connected to the lower end face of the wax model via multiple ingates; the lower end of the sprue is used for the center connection of the horizontal sprue; multiple reinforcing rings are arranged vertically at intervals inside the wax model, and the outer circumferential surface of the reinforcing rings is connected to the inner wall of the wax model via multiple connecting ribs.

[0007] Preferably, the anti-deformation structure further includes a fixing fixture consisting of an upper fixing plate, a lower fixing plate, and tie rods; the wax model, the inner sprue, the horizontal sprue, and the vertical sprue together constitute a wax model assembly; an annular riser is provided on the top of the wax model; the wax model assembly is placed on the lower fixing plate, the upper fixing plate is positioned above the wax model assembly, and the upper end of the mandrel passes through the upper fixing plate and is screwed with a nut; the upper fixing plate and the lower fixing plate are connected by multiple tie rods; multiple tightening screws are provided on the upper fixing plate, and the lower ends of the tightening screws are pressed against the top surface of the annular riser.

[0008] Preferably, the upper fixing plate is composed of a disc body and multiple strip plates, which are integrally formed in a star-shaped pattern on the outer circumferential surface of the disc body. The lower fixing plate includes an annular body and multiple ear plates integrally formed on the outer circumferential surface of the annular body.

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

[0010] Preferably, the number of ear plates is the same as the number of strip plates, and the strip plates correspond to the upper and lower positions of the ear plates; 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 pads are provided between the lower fixing plate and the horizontal sprue.

[0012] Preferably, the horizontal runner includes multiple arc-shaped strips and multiple rings; the multiple arc-shaped strips are evenly distributed in a ring, and the inner ends of the multiple arc-shaped strips converge and connect to the lower end of the straight runner; the multiple rings and the multiple arc-shaped strips are integrally formed; the corners at the intersection of the arc-shaped strips and the rings are smoothly transitioned with R6, and the corners at the intersection of two adjacent arc-shaped strips are also smoothly transitioned with R6.

[0013] Preferably, the ingate is a frustum pyramid structure with a side slope of 9 degrees; the large end of the frustum pyramid has a size of 40mm × 100mm.

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

[0015] Preferably, two adjacent reinforcing rings are connected by multiple struts.

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

[0017] (1) In this invention, a mandrel is embedded in the center of the sprue. The mandrel serves to strengthen the sprue and also to connect and fix the fixture.

[0018] (2) By setting multiple reinforcing rings at intervals inside the wax mold, and connecting the outer circumference of the reinforcing rings with the inner wall of the wax mold through multiple connecting ribs, the reinforcing rings can effectively prevent axial deformation and torsional deformation of the wax mold assembly during the coating preparation, melting and casting process.

[0019] (3) By setting an annular riser on the top of the wax mold, its function is to supplement the shrinkage of the casting part after pouring, and avoid the generation of porosity defects.

[0020] (4) In this invention, the wax mold assembly is installed in a fixed fixture. The fixed fixture is an upper fixed plate, a lower fixed plate and a tie rod forming a stable frame structure, which can further prevent the wax mold assembly from axial deformation and torsional deformation during the coating, melting and casting process. Attached Figure Description

[0021] 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.

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

[0023] Figure 2 This is a schematic diagram showing that the wax model, the inner sprue, the horizontal sprue, and the vertical sprue together constitute the wax model assembly in this invention;

[0024] Figure 3 This is a schematic diagram of the component structure formed by the horizontal gating system and the vertical gating system in this invention;

[0025] Figure 4 This is a schematic diagram of the wax mold assembly installed in a fixed fixture in this invention.

[0026] Explanation of the reference numerals: 1. Sprue; 2. Runner; 2a. Curved strip; 2b. Ring; 3. Wax model; 4. Reinforcing ring; 5. Annular riser; 6. Ingate; 7. Connecting rib; 8. Mandrel; 9. Upper fixing plate; 9a. Disc; 9b. Spoke plate; 9c. Curved reinforcing plate; 9d. First strip hole; 10. Lower fixing plate; 10a. Ring; 10b. Ear plate; 10c. Second strip hole; 11. Tightening screw; 12. Nut; 13. Spacer; 14. Support. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Combination Figures 2 to 4 As shown, a deformation-resistant structure for a cylindrical titanium alloy casting wax model pouring system includes a wax model 3, a vertical sprue 1 at the center of the wax model 3, and a mandrel 8 embedded in the center of the sprue 1; a horizontal sprue 2 is connected to the lower end face of the wax model 3 through multiple ingates 6; the lower end of the sprue 1 is used for the center connection of the horizontal sprue 2; multiple reinforcing rings 4 are arranged vertically at intervals inside the wax model 3, and the outer circumferential surface of the reinforcing rings 4 is connected to the inner wall of the wax model 3 through multiple connecting ribs 7.

[0031] Combination Figure 4 As shown, the anti-deformation structure also includes a fixing fixture consisting of an upper fixing plate 9, a lower fixing plate 10, and a tie rod 11; the wax model 3, the inner sprue 6, the horizontal sprue 2, and the vertical sprue 1 together constitute a wax model assembly; an annular riser 5 is provided on the top of the wax model 3; the wax model assembly is placed on the lower fixing plate 10, the upper fixing plate 9 is positioned above the wax model assembly, and the upper end of the mandrel 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 multiple tie rods 11; multiple tightening screws 11 are provided on the upper fixing plate 9, and the lower ends of the tightening screws 11 are pressed against the top surface of the annular riser 5.

[0032] Furthermore, the upper fixing plate 9 is composed of a disc body 9a and multiple strip plates 9b, which are integrally formed in a star-shaped pattern on the outer circumferential surface of the disc body 9a. The lower fixing plate 10 includes an annular body 10a and multiple ear plates 10b integrally formed on the outer circumferential surface of the annular body 10a. This structure effectively reduces the weight of the upper fixing plate 9 and the lower fixing plate 10. An arc-shaped reinforcing plate 9c is provided between two adjacent strip plates 9b to provide reinforcement.

[0033] Combination Figure 4 As shown, the number of ear plates 10b is the same as the number of strip plates 9b, and the strip plates 9b correspond to the upper and lower positions of the ear plates 10b. 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 to facilitate 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 to facilitate adjustment of the radial position of the tightening screw 11, so as to tighten it onto 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 horizontal runner 2. By providing pads 13, direct contact between the lower fixing plate 10 and the horizontal runner 2 is avoided, so as to facilitate the subsequent operation of preparing the coating film.

[0035] Combination Figure 3 As shown, the horizontal runner 2 includes multiple arc-shaped strips 2a and multiple rings 2b; the multiple arc-shaped strips 2a are evenly distributed in a ring, and the inner ends of the multiple arc-shaped strips 2a converge and connect to the lower end of the straight runner 1; the multiple rings 2b and the multiple arc-shaped strips 2a are integrally formed; the corners at the intersection of the arc-shaped strips 2a and the rings 2b are smoothly transitioned with R6, and the corners at the intersection of two adjacent arc-shaped strips 2a are also smoothly transitioned with R6.

[0036] In this embodiment, the ingate 6 is a frustum pyramid structure with a side slope of 9 degrees; the larger end of the frustum pyramid has dimensions of 40mm × 100mm. The larger end of the ingate 6 is connected to the runner 2, and the smaller end of the ingate 6 is connected to the wax model 3.

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

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

[0039] 1. Fabrication of the sprue 1 with an internal mandrel 8: The sprue 1 has a size of φ120mm and a height of 700mm. The mandrel 8 serves to reinforce the sprue 1 and also connects and fixes the fixtures.

[0040] 2. Making the sprue 2: The maximum diameter of the bottom of the wax model 3 is φ900mm. Therefore, when making the sprue 2, the outer diameter of the outermost ring 2b is set to φ950mm.

[0041] III. Pressing the wax pattern 3, reinforcing ring 4, and annular riser 5: There are two reinforcing rings 4, one with an outer diameter of φ780mm and the other with an outer diameter of φ840mm; the annular riser 5 has an outer diameter of φ840mm. The reinforcing ring 4 effectively prevents axial and torsional deformation of the wax pattern assembly during assembly, coating, and melting / pouring. The annular riser 5 compensates for partial shrinkage of the casting after pouring, preventing porosity defects.

[0042] IV. Fabrication of Inner Runner 6: Inner runner 6 is a frustum pyramid structure with a side slope of 9 degrees; the large end of the frustum pyramid has a size of 40mm × 100mm.

[0043] V. Fabrication of Fixtures: The fixtures consist of an upper fixing plate 9, a lower fixing plate 10, and a tie rod 11.

[0044] VI. Assembly of the gating system: After verifying that the surface quality of wax model 3 meets the requirements of the process specifications, the gating system is assembled. Specifically, the steps include:

[0045] ① Connect the straight sprue 1 and the horizontal sprue 2 together;

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

[0047] ③ The assembly formed by the sprue 1 and the runner 2 is connected to the wax model 3 through the ingate 6. Twelve ingates 6 are evenly distributed and connected to the large end face of the wax model 3. The small end of the ingate 6 is connected to the large end face of the wax model 3, and the large end of the ingate 6 is connected to the runner 2. Thus, the wax model 3, the ingate 6, the runner 2, and the sprue 1 together constitute the wax model assembly.

[0048] 7. Install the wax model assembly in the fixed fixture. The purpose of the fixed fixture is to prevent the wax model assembly from axial deformation and torsional deformation during the coating preparation, melting and casting process.

[0049] 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 deformation-resistant structure for a cylindrical titanium alloy casting wax pattern pouring system, comprising a wax pattern (3), characterized in that: A vertical sprue (1) is provided in the center of the wax mold (3), and a mandrel (8) is embedded in the center of the sprue (1). A horizontal sprue (2) is connected to the lower end face of the wax model (3) through multiple internal sprues (6); the lower end of the sprue (1) is used for the center connection of the horizontal sprue (2); Multiple reinforcing rings (4) are arranged at intervals inside the wax model (3), and the outer circumferential surface of the reinforcing rings (4) is connected to the inner wall of the wax model (3) by multiple connecting ribs (7); It also includes a fixing fixture consisting of an upper fixing plate (9), a lower fixing plate (10) and a tie rod; the wax mold (3), the inner sprue (6), the horizontal sprue (2) and the straight sprue (1) together constitute the wax mold assembly; an annular riser (5) is provided 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 positioned above the wax mold assembly, and the upper end of the mandrel (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 multiple tie rods; multiple tightening screws (11) are provided on the upper fixing plate (9), and the lower end of the tightening screws (11) is pressed against the top surface of the annular riser (5); The horizontal runner (2) includes multiple arc-shaped strips (2a) and multiple rings (2b); the multiple arc-shaped strips (2a) are evenly distributed in a ring, and the inner ends of the multiple arc-shaped strips (2a) converge and connect to the lower end of the straight runner (1); the multiple rings (2b) and the multiple arc-shaped strips (2a) are integrally formed; the corners at the intersection of the arc-shaped strips (2a) and the rings (2b) are smoothly transitioned by R6, and the corners at the intersection of two adjacent arc-shaped strips (2a) are also smoothly transitioned by R6. The inner gating system (6) is a frustum pyramid structure with a side slope of 9 degrees; the large end of the frustum pyramid has a size of 40mm × 100mm. The large end of the ingate (6) is connected to the sprue (2), and the small end of the ingate (6) is connected to the wax mold (3).

2. The anti-deformation structure of the cylindrical titanium alloy casting wax pattern pouring system as described in claim 1, characterized in that, The upper fixing plate (9) is composed of a disc body (9a) and multiple strip plates (9b). The multiple strip plates (9b) are integrally formed on the outer peripheral surface of the disc body (9a) in a star-shaped manner. The lower fixing plate (10) includes an annular body (10a) and multiple ear plates (10b) integrally formed on the outer peripheral surface of the annular body (10a).

3. The anti-deformation structure of the cylindrical titanium alloy casting wax pattern pouring system as described in claim 2, characterized in that, An arc-shaped reinforcing plate (9c) is provided between two adjacent strip plates (9b).

4. The anti-deformation structure of the cylindrical titanium alloy casting wax pattern pouring system as described in claim 2, characterized in that, The number of ear plates (10b) is the same as the number of strip plates (9b), and the strip plates (9b) correspond to the ear plates (10b) in their upper and lower positions; a first strip hole (9d) is provided on the strip plate (9b); a second strip hole (10c) is provided on the ear plate (10b); the upper and lower ends of the pull rod are respectively installed in the first strip hole (9d) and the second strip hole (10c); the tightening screw (11) is installed in the first strip hole (9d).

5. The anti-deformation structure of the cylindrical titanium alloy casting wax pattern pouring system as described in claim 1, characterized in that, Multiple pads (13) are provided between the lower fixing plate (10) and the horizontal sprue (2).

6. The anti-deformation structure of the cylindrical titanium alloy casting wax pattern pouring system as described in claim 1, characterized in that, The two adjacent reinforcing rings (4) are connected by multiple support pillars (14).

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