Method for preparing wax models containing multi-angled lumens

Abstract

This invention provides a method for preparing a wax model containing multi-angled cavities. The method includes the following steps: obtaining a core; the core comprising multiple tubes distributed at multiple angles; assembling the core with segmented wax models, such that the core is placed within the multi-angled cavities formed by the combined segments of the wax models, thus obtaining a wax model containing multi-angled cavities; wherein at least a portion of the inner diameter of the tubes at their ends is the same as the inner diameter of the ends of the multi-angled cavities for precise fit, and the remaining portions of at least a portion of the tubes are suspended within the multi-angled cavities. The preparation method of this invention ensures both precise fit between the segmented wax models and the core, and utilizes the dimensional accuracy of the core to guarantee the dimensional accuracy of the internal cavities of the subsequent casting.

Description

Technical Field

[0001] This invention relates to the field of wax model preparation technology, and specifically to a method for preparing a wax model containing multi-angled cavities. Background Technology

[0002] Titanium alloy precision castings are generally prepared using investment casting, also known as lost-wax casting. Investment casting typically involves creating a pattern from a fusible material, coating the pattern with several layers of refractory material to form a shell, melting the pattern and removing it from the shell, then firing it at high temperature to obtain the final shell. Molten metal is then poured into the shell to obtain the casting. The process generally includes wax pressing, shell preparation, dewaxing, molten metal pouring, and post-processing. For titanium alloy precision castings, due to the need for structural and functional uniformity, the internal structure is complex, often containing blind cavities. This requires the use of ceramic cores to form these complex cavities. After casting, the core is removed to form the internal cavity structure. Therefore, during the wax pressing process, a core is placed in the wax pressing mold before wax is poured in, forming a wax model with the core. For castings with complex internal cavities, it is common practice to prepare segmented wax models in different areas and then assemble them into a single, complete wax model.

[0003] Because the overall wax model is composed of multiple parts, misalignment can easily occur during assembly when fitting the segmented wax models and multi-angled cavity cores due to dimensional accuracy issues in both the segmented wax models and the cores. For example, some segmented wax models may fit the core, but after assembly, the remaining segmented wax models cannot fully fit the core due to dimensional accuracy problems with both the wax models and the cores, resulting in inaccurate assembly of the segmented wax models with the cores. Furthermore, for wax models with internal cores, the cores are susceptible to displacement and breakage due to wax impact during the wax pressing process. This can prevent the casting from forming or directly affect the dimensional accuracy of the complex internal structure of the casting, significantly impacting the service life and reliability of the casting. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the main objective of the present invention is to provide a method for preparing a wax model containing a multi-angle cavity. The preparation method of the present invention can ensure the precise fit between the segmented wax model and the core, and can also use the dimensional accuracy of the core to ensure the dimensional accuracy of the inner cavity of the casting later.

[0005] To achieve the above objectives, the present invention provides a method for preparing a wax model containing a multi-angled cavity, comprising the following steps: obtaining a core; the core comprising a plurality of tubes distributed at multiple angles; obtaining a bottom wax model, a rear wax model, and a front wax model; wherein the bottom wax model is provided with a first channel groove, the rear wax model is provided with a second channel groove, and the front wax model is provided with a third channel groove; assembling the core with the bottom wax model, the rear wax model, and the front wax model, such that the core is placed within the multi-angled cavity formed by the first channel groove, the second channel groove, and the third channel groove, thereby obtaining the wax model containing the multi-angled cavity; wherein at least a portion of the inner diameter of the tubes at the port of the core is the same as the inner diameter of the port of the multi-angled cavity for precise fit, and the remaining portion of at least a portion of the tubes is suspended in the multi-angled cavity.

[0006] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the tube is ≤10mm, the distance between the suspended portion of the tube and the cavity wall of the multi-angle cavity at the corresponding position is ≤1mm; when the wall thickness of the wax mold corresponding to the suspended portion of the tube is >10mm, the distance between the suspended portion of the tube and the cavity wall of the multi-angle cavity at the corresponding position is ≤2mm.

[0007] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the tube body is ≤3mm, the distance between the suspended portion of the tube body and the cavity wall of the multi-angle cavity at the corresponding position is ≤0.5mm.

[0008] In some embodiments of the present invention, the length of the portion of the tube with the same inner diameter at the port of the tube is ≥8mm.

[0009] In some embodiments of the present invention, the core is prepared according to the casting cavity structure, and the plurality of tubes are divided into X tubes, Y tubes, and Z tubes according to the tube extension direction.

[0010] In some embodiments of the present invention, the X-tube, Y-tube, and Z-tube represent the three-dimensional coordinate axes X-axis, Y-axis, and Z-axis where the tube is located, and there is at least one X-tube, Y-tube, and Z-tube respectively.

[0011] In some embodiments of the present invention, the wax model is designed according to the casting structure, and the bottom wax model is obtained by dividing the wax model at the corresponding position using the plane formed by the center lines of the X tube and the Y tube as the dividing plane; the remaining wax model is divided at the corresponding position using the plane formed by the center lines of the X tube and the part of the Z tube connected to the X tube as the dividing plane to obtain the rear wax model and the front wax model.

[0012] In some embodiments of the present invention, the assembly of the core with the bottom wax mold, the rear wax mold, and the front wax mold includes: placing the X-tube, Y-tube, and part of the Z-tube of the core in the first channel groove of the bottom wax mold for positioning in the X, Y, and Z directions; assembling the rear wax mold and the front wax mold onto the bottom wax mold respectively, with the front wax mold and the rear wax mold aligned, such that part of the second channel groove and part of the third channel groove surround to form a cavity that sleeves part of the Z-tube, and such that the first channel groove and part of the third channel groove and part of the second channel groove surround to form a cavity that sleeves the X-tube, Y-tube, and part of the Z-tube.

[0013] In some embodiments of the present invention, the Z tube body further includes a Z1 tube body connected to the Y tube body, and the rear wax mold is further provided with a through-tube cavity for fitting the Z1 tube body.

[0014] In some embodiments of the present invention, a portion of the Z1 tube body has the same inner diameter as the corresponding sleeve cavity for precise fit, while the remaining portion of the Z1 tube body is suspended in the sleeve cavity.

[0015] In some embodiments of the present invention, the bottom wax mold is provided with a first positioning protrusion and a second positioning protrusion, the first positioning protrusion being used for positioning and assembly with the rear wax mold; the second positioning protrusion being used for positioning and assembly with the front wax mold.

[0016] In some embodiments of the invention, at least a portion of the core tube passes through the multi-angled cavity and protrudes outside the wax model.

[0017] In some embodiments of the present invention, the wax film preparation method further includes: melting and fusing at least a portion of the seams between the base wax mold, the rear wax mold, and the front wax mold together.

[0018] Advantages of this invention:

[0019] The present invention employs a method of precisely fitting the port of the multi-angle cavity with the port of at least a portion of the core tube, while the remaining portion of the core tube is suspended in the multi-angle cavity. This method avoids the problem that the core, due to having multiple tubes distributed at multiple angles, cannot be assembled with the multi-angle cavity in a certain dimension.

[0020] Because the core's X, Y, and Z tubes are located on different planes, assembly interference is unavoidable when assembling the bottom wax model, front wax model, rear wax model, and core. For example, after the X and Y tubes are assembled with the bottom wax model, due to the shrinkage and deformation of the wax model, the front and rear wax models cannot be assembled with the Z tubes (such as Z1, Z2, Z3, etc.) in multiple directions simultaneously with the X and Y tubes. In this case, the gap between the suspended part of the tube and the cavity wall of the multi-angled cavity can be used as space to adjust the interference.

[0021] This invention utilizes the plane formed by the center lines of the X, Y, and Z tubes of the core as the dividing surface of the wax model, dividing the wax model containing multi-angle cavities into a front wax model, a rear wax model, and a bottom wax model. Therefore, the splicing of the front wax model, the rear wax model, and the bottom wax model inevitably involves the positioning of the wax model in the three-dimensional directions of X, Y, and Z, which helps to ensure that the wax model containing multi-angle cores is accurately positioned in all three dimensions during the splicing process.

[0022] The present invention features a sleeve cavity structure that is fitted onto the corresponding Z-tube body. The sleeve cavity fixes the front wax model and the rear wax model into a whole, restricting their movement in the Z-direction, ensuring the integrity of the sequentially assembled front and rear wax models, and establishing their positioning in the Z-direction.

[0023] In this invention, the multi-angle distribution of the core tube and the segmented wax mold form a multi-dimensional fit, which not only ensures the precise fit between the segmented wax mold and the core, but also utilizes the dimensional accuracy of the core to ensure the dimensional accuracy of the inner cavity of the casting later. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. In the drawings:

[0025] Figure 1 A schematic diagram of a wax mold structure containing multi-angled cavities in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the core structure in an embodiment provided by the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the bottom wax mold in the embodiments provided by the present invention;

[0028] Figure 4 This is a schematic diagram of the structure after the bottom wax mold and the core are assembled in an embodiment of the present invention;

[0029] Figure 5This is a schematic diagram of the structure of the front wax model in an embodiment provided by the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the core, bottom wax model and front wax model after assembly in the embodiment provided by the present invention;

[0031] Figure 7 Schematic diagram of the post-wax mold structure in the embodiments provided by the present invention Figure 1 ;

[0032] Figure 8 Schematic diagram of the post-wax mold structure in the embodiments provided by the present invention Figure 2 .

[0033] In the picture:

[0034] 1. Core; 11. X tube body; 12. Y tube body; 13. Z1 tube body; 14. Z2 tube body; 15. Z3 tube body; 16. Z4 tube body;

[0035] 2. Bottom wax mold; 21. First pipe groove; 22. First positioning protrusion; 23. Second positioning protrusion;

[0036] 3. Rear wax mold; 31. Second pipe groove; 32. Through-sleeve cavity;

[0037] 4. Front wax model; 41. Third pipe groove;

[0038] 5. Splice the top surface. Detailed Implementation

[0039] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0040] Figure 1 A schematic diagram of the overall structure of the wax model containing multi-angled cavities prepared in this invention is shown.

[0041] The wax model containing multi-angle cavities in this invention is assembled by combining and assembling a segmented wax model (including a front wax model 4, a rear wax model 3, and a bottom wax model 2) and a core 1.

[0042] The bottom wax model 2 has a first channel groove 21, the rear wax model 3 has a second channel groove 31, and the front wax model 4 has a third channel groove 41. The core 1 is assembled with the bottom wax model 2, the rear wax model 3, and the front wax model 4. The core 1 is placed in the multi-angle cavity formed by the first channel groove 21, the second channel groove 31, and the third channel groove 41. At least a portion of the inner diameter of the tube at the end of the core 1 is the same as the inner diameter of the end of the multi-angle cavity for a precise fit. The remaining portion of at least a portion of the tube is suspended in the multi-angle cavity.

[0043] This invention employs a method where the port of the multi-angled cavity precisely mates with the port of at least a portion of the tube body of the core 1, while the remaining portion of the tube body is suspended within the multi-angled cavity. This avoids the problem that the core 1, due to its multiple tube bodies distributed at multiple angles, cannot be assembled with the multi-angled cavity in a certain dimension. In this invention, because the multi-angled tube bodies of the core 1 form a multi-dimensional mating relationship with the segmented wax model, it ensures both precise mating between the segmented wax model and the core 1, and utilizes the dimensional accuracy of the core 1 to guarantee the dimensional accuracy of the inner cavity of the later casting.

[0044] In an embodiment of the present invention, when the wall thickness of the wax mold corresponding to the suspended part of the tube body is ≤10mm, the distance between the suspended part of the tube body and the cavity wall of the multi-angle tube at the corresponding position is ≤1mm. It can also be understood that the distance between the suspended part of the tube body and the groove walls of the first pipe groove 21, the second pipe groove 31, and the third pipe groove 41 at the corresponding position is ≤1mm.

[0045] In an embodiment of the present invention, when the wall thickness of the wax mold corresponding to the suspended part of the tube is greater than 10mm, the distance between the suspended part of the tube and the cavity wall of the multi-angle cavity at the corresponding position is ≤2mm. This can also be understood as the distance between the suspended part of the tube and the groove walls of the first pipe groove 21, the second pipe groove 31, and the third pipe groove 41 at the corresponding position is ≤2mm.

[0046] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended part of the tube body is ≤3mm, the distance between the suspended part of the tube body and the cavity wall of the multi-angle tube at the corresponding position is ≤0.5mm. It can also be understood that the distance between the suspended part of the tube body and the groove walls of the first pipe groove 21, the second pipe groove 31, and the third pipe groove 41 at the corresponding position is ≤0.5mm.

[0047] In the embodiments of the present invention, the spacing between the suspended part of the tube and the cavity wall of the multi-angle tube at the corresponding position is designed to meet both the assembly requirements of the core 1 and the requirements of wax mold shrinkage and deformation.

[0048] It is worth mentioning that in the present invention, the distance between the suspended part of the tube body and the wall of the multi-angle lumen can also be designed according to the proportional relationship between the distance existing between the suspended part of the tube body and the wall of the multi-angle lumen and the wall thickness of the wax mold corresponding to the suspended part of the tube body.

[0049] Among them, the proportional relationship formula is: d = kx;

[0050] In the formula, k is the proportionality coefficient, d is the distance between the suspended part of the tube body and the wall of the multi-angle lumen at the corresponding position, and x is the wall thickness of the wax mold.

[0051] In some embodiments of the present invention, when 1mm ≤ x ≤ 8mm, 0.4 ≤ k ≤ 0.5.

[0052] In some embodiments of the present invention, when 8mm < x ≤ 20mm, 0.1 ≤ k ≤ 0.15.

[0053] In some embodiments of the present invention, the length of the part with the same inner diameter at the port of the tube body is ≥ 8mm to ensure high-precision precise fitting.

[0054] The method for preparing the wax mold containing the multi-angle lumen in the present invention is carried out according to the following steps.

[0055] (1) Obtain the core 1.

[0056] In the embodiment of the present invention, the core 1 is prepared according to the cavity structure of the casting.

[0057] In the embodiment of the present invention, the core 1 includes a plurality of tube bodies distributed at multiple angles, and the plurality of tube bodies are distributed in three different orientations of X, Y, and Z. It can be understood that the core 1 has a multi-angle pipe-like structure.

[0058] Figure 2 Figure shows a specific structural schematic diagram of a core 1.

[0059] According to the tube body extension direction, the plurality of tube bodies constituting the core 1 are divided into X tube body 11, Y tube body 12, and Z tube body, where: the Z tube body includes Z1 tube body 13, Z2 tube body 14, Z3 tube body 15, and Z4 tube body 16.

[0060] In the embodiment of the present invention, the Z1 tube body 13 is connected to the Y tube body 12, the Z2 tube body 14 is connected to the X tube body 11, and the Z1 tube body 13 and the Z2 tube body 14 are not arranged in the same direction.

[0061] In the embodiment of the present invention, the Z3 tube body 15 is connected to the connection part of the X tube body 11 and the Y tube body 12, and the Z4 tube body 16 is connected to the connection part of the X tube body 11 and the Y tube body 12.

[0062] In some embodiments of the present invention, the X tube 11 includes the X1 tube and the X2 tube; the Y tube 12 includes the Y1 tube and the Y2 tube.

[0063] (2) Design the wax pattern according to the structure of the casting, and divide the overall wax pattern into bottom wax pattern 2, rear wax pattern 3 and front wax pattern 4. Then, assemble the core 1 with the obtained bottom wax pattern 2, rear wax pattern 3 and front wax pattern 4 to obtain a wax pattern with multi-angle cavities inside.

[0064] In one embodiment of the present invention, the bottom wax model 2 is obtained by dividing the wax model at the corresponding position using the plane formed by the center lines of the X tube 11 and the Y tube 12 as the dividing plane; the remaining wax model is divided at the corresponding position using the plane formed by the center lines of the X tube 11 and the part of the Z tube connected to the X tube 11 as the dividing plane to obtain the rear wax model 3 and the front wax model 4.

[0065] Therefore, the splicing of the front wax model 4, the rear wax model 3 and the bottom wax model 2 inevitably involves the positioning of the wax models in the three-dimensional directions of X, Y and Z, which helps to ensure that the wax models containing multi-angle cores are accurately positioned in all three dimensions during the splicing process.

[0066] (2-1) Assemble the core 1 onto the bottom wax mold 2 to obtain the combined structure of the core 1 and the bottom wax mold 2.

[0067] Figure 3 A schematic diagram of the structure of a base wax mold 2 is shown. Figure 4 A schematic diagram of the assembly structure of the core 1 being assembled onto the bottom wax mold 2 is shown.

[0068] In an embodiment of the present invention, the core 1 is placed in the first channel groove 21 corresponding to the bottom wax mold 2, and part of the tube is placed in the first channel groove 21, and positioning in the X, Y and Z directions is achieved to prevent the core 1 from sliding in the first channel groove 21.

[0069] In some embodiments of the present invention, the X tube 11, Y tube 12 and part of the Z tube of the core 1 are placed in the first channel groove 21 of the bottom wax mold 2 to be positioned in the X, Y and Z directions.

[0070] In some embodiments of the present invention, the X tube 11, Y tube 12, and Z2 tube 14 of the core 1 are placed correspondingly in the first channel groove 21 of the bottom wax mold 2. The X tube 11 and Y tube 12 respectively mate with a portion of the first channel groove 21 (which can be called the first core groove) to be positioned in the X and Y directions; the Z2 tube 14 mates with a portion of the first channel groove 21 (which can be called the first positioning groove) to be positioned in the Z direction. At this time, the core 1 is positioned in the X, Y, and Z directions by the X tube 11, Y tube 12, and Z2 tube 14, preventing the core 1 from sliding in the first channel groove 21.

[0071] It is worth mentioning that the inner diameter of the Z2 pipe body 14 is the same as the inner diameter of the first pipe groove 21 at the corresponding position to ensure precise positioning in the Z direction.

[0072] The inner diameters at the ports of the X tube 11 and Y tube 12 of the core 1 are the same as the inner diameters at the ports of the first pipe groove 21 at the corresponding positions, which is a precision fit.

[0073] The inner diameter of the remaining parts of the X tube 11 and Y tube 12 of the core 1 is smaller than the inner diameter of the first pipe groove 21 at the corresponding position. After the core 1 is assembled into the first pipe groove 21, the X tube 11 and Y tube 12 are fixed only through the port of the first pipe groove 21, and the remaining parts of the X tube 11 and Y tube 12 are suspended in the first pipe groove 21.

[0074] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11 and Y-tube 12 is ≤10mm, the distance between the suspended portion of the X-tube 11 and Y-tube 12 and the cavity wall of the multi-angle cavity at the corresponding position is ≤1mm. This can also be understood as the distance between the suspended portion of the X-tube 11 and Y-tube 12 and the groove wall of the first pipe groove 21 at the corresponding position is ≤1mm.

[0075] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11 and Y-tube 12 is >10mm, the distance between the suspended portion of the X-tube 11 and Y-tube 12 and the cavity wall of the multi-angle cavity at the corresponding position is ≤2mm. This can also be understood as the distance between the suspended portion of the X-tube 11 and Y-tube 12 and the groove wall of the first pipe groove 21 at the corresponding position is ≤2mm.

[0076] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11 and Y-tube 12 is ≤3mm, the distance between the suspended portion of the X-tube 11 and Y-tube 12 and the cavity wall of the multi-angle cavity at the corresponding position is ≤0.5mm. It can also be understood that the distance between the suspended portion of the X-tube 11 and Y-tube 12 and the groove wall of the first pipe groove 21 at the corresponding position is ≤0.5mm.

[0077] (2-2) Assemble the front wax mold 4 onto the bottom wax mold 2 to obtain the combined structure of the core 1, the bottom wax mold 2 and the front wax mold 4.

[0078] Figure 5 A schematic diagram of a front wax mold 4 is shown. The structure of the core 1, bottom wax mold 2, and front wax mold 4 after assembly is as follows. Figure 6 As shown.

[0079] In an embodiment of the present invention, the third pipe groove 41 of the front wax mold 4 is provided in a corresponding part of the pipe body, and the front wax mold 4 is assembled onto the bottom wax mold 2.

[0080] In some embodiments of the present invention, a portion of the third pipe groove 41 corresponds to a portion of the first pipe groove 21 and surrounds it for connecting the X pipe body 11 and the Y pipe body 12.

[0081] In some embodiments of the present invention, a portion of the third pipe groove 41 is provided corresponding to the Z3 pipe body 15 and the Z4 pipe body 16.

[0082] After the front wax mold 4 is assembled with the X tube 11, Y tube 12 and Z2 tube 14 of the core 1, it is assembled onto the bottom wax mold 2. Therefore, the front wax mold 4 and the bottom wax mold 2 are positioned in the X and Y directions, and the front wax mold 4 cannot move in the X and Y directions, thus ensuring accurate assembly in the X and Y directions.

[0083] It is worth mentioning that the inner diameter of the port of the third pipe groove 41 of the front wax mold 4 is the same as the inner diameter of the port of the corresponding fitting pipe body, which is a precision fit.

[0084] The inner diameter of the remaining part of the third pipe groove 41 is larger than the inner diameter of the corresponding pipe body. After the current wax model 4 is assembled onto the bottom wax model 2, the X pipe body 11, Y pipe body 12 and part of the Z pipe body, such as Z3 pipe body 15 and Z4 pipe body 16, are fixed only through the port of the third pipe groove 41. The remaining parts of the X pipe body 11, Y pipe body 12 and part of the Z pipe body are suspended in the third pipe groove 41.

[0085] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 is ≤10mm, the distance between the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 and the groove wall of the third pipe groove 41 at the corresponding position is ≤1mm.

[0086] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 is >10mm, the distance between the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 and the groove wall of the third pipe groove 41 at the corresponding position is ≤2mm.

[0087] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 is ≤3mm, the distance between the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 and the wall of the third pipe groove 41 at the corresponding position is ≤0.5mm.

[0088] In an embodiment of the present invention, a second positioning protrusion 23 is also provided on the bottom wax mold 2. The second positioning protrusion 23 is used for positioning and assembly with the front wax mold 4, so that the front wax mold 4 and the bottom wax mold 2 form a positioning assembly.

[0089] (2-3) Assemble the rear wax mold 3 onto the bottom wax mold 2 to obtain the combined structure of core 1, bottom wax mold 2, front wax mold 4 and rear wax mold 3.

[0090] Figure 7 A schematic diagram of the structure of a post-wax mold 3 is shown. Figure 1 , Figure 8 A schematic diagram of the structure of a post-wax mold 3 is shown. Figure 2 The overall structure after assembling the core 1, bottom wax model 2, front wax model 4, and rear wax model 3 is as follows: Figure 1 As shown.

[0091] In an embodiment of the present invention, the second pipe groove 31 of the rear wax mold 3 is placed corresponding to a portion of the tube body of the core 1, and the rear wax mold 3 is assembled onto the bottom wax mold 2. The front wax mold 4 and the rear wax mold 3 are aligned, such that a portion of the second pipe groove 31 of the rear wax mold 3 and a portion of the third pipe groove 41 of the front wax mold 4 enclose a cavity for a sleeved portion of the Z tube body, such as the cavity of the Z3 tube body 15 and the Z4 tube body 16. At the same time, the first pipe groove 21 of the bottom wax mold 2, a portion of the third pipe groove 41, and a portion of the second pipe groove 31 enclose a cavity for a sleeved X tube body 11, Y tube body 12, and a portion of the Z tube body, such as the Z2 tube body 14.

[0092] After the rear wax mold 3 is assembled with the X tube 11, Y tube 12 and Z4 tube 16 of the core 1, it is mounted on the bottom wax mold 2 and the front wax mold 4. Therefore, the rear wax mold, the front wax mold 4 and the bottom wax mold 2 are positioned in the X and Y directions, and the rear wax mold 3 cannot move in the X and Y directions, thus ensuring accurate assembly in the X and Y directions.

[0093] It is worth mentioning that the inner diameter of the port of the second pipe groove 31 of the rear wax mold 3 is the same as the inner diameter of the port of the corresponding fitting pipe body, which is a precision fit.

[0094] The inner diameter of the remaining part of the second pipe groove 31 is larger than the inner diameter of the corresponding pipe body. After the rear wax model 3 is assembled onto the bottom wax model 2, the X pipe body 11, Y pipe body 12 and part of the Z pipe body, such as Z3 pipe body 15 and Z4 pipe body 16, are fixed only through the port of the second pipe groove 31. The remaining parts of the X pipe body 11, Y pipe body 12 and part of the Z pipe body are suspended in the second pipe groove 31.

[0095] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 is ≤10mm, the distance between the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 and the groove wall of the second pipe groove 31 at the corresponding position is ≤1mm.

[0096] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 is >10mm, the distance between the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 and the groove wall of the second pipe groove 31 at the corresponding position is ≤2mm.

[0097] In some embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 is ≤3mm, the distance between the suspended portion of the X-tube 11, Y-tube 12, Z3-tube 15, and Z4-tube 16 and the groove wall of the second pipe groove 31 at the corresponding position is ≤0.5mm.

[0098] In some embodiments of the present invention, the inner diameter of the Z2 tube 14 is the same as the inner diameter of the second pipe groove 31 at the corresponding position for a precise fit.

[0099] It can be understood that the inner diameter of tube 14 of Z2 is the same as the inner diameter of the multi-angle lumen at the corresponding position for precise fit.

[0100] In an embodiment of the present invention, the rear wax mold 3 is further provided with at least one through-tube cavity 32, which is sleeved on the corresponding Z-tube body. Through the through-tube cavity 32, the front wax mold 4 and the rear wax mold 3 are fixed as a whole, restricting the movement of the front wax mold 4 and the rear wax mold 3 in the Z direction, and forming the positioning of the front wax mold 4 and the rear wax mold 3 in the Z direction.

[0101] As one embodiment of the present invention, the rear wax mold 3 is provided with a through-tube cavity 32 for sleeved onto the Z1 tube body 13.

[0102] It is worth mentioning that a portion of the Z1 tube body 13 has the same inner diameter as the corresponding sleeve cavity 32 for precise fit, while the remaining portion of the Z1 tube body 13 is suspended in the sleeve cavity 32.

[0103] In an embodiment of the present invention, at least a portion of the core 1 tube passes through the multi-angle cavity and protrudes outside the wax mold, that is, the core 1 tube has a portion protruding from the wax mold.

[0104] (2-4) Melt at least part of the joint between the bottom wax model 2, the rear wax model 3, and the front wax model 4 and fuse them together.

[0105] In an embodiment of the present invention, after the overall assembly is completed, a cover is set outside the position where the core 1 and the segmented wax molds are spliced ​​and the wax molds are exposed. The cover is made of an elastic material that can tightly fix at least two segmented wax molds and the core 1.

[0106] Then, at point 5 on the top surface of the splicing, the wax model in the local area of ​​the splicing seam is melted, and the splicing seam is fused together, splicing the segmented wax models into a whole.

[0107] Finally, remove the envelope.

[0108] In embodiments of the present invention, a soldering iron can be selected as the tool for melting the seam.

[0109] It should be noted that the term "comprising" and any variations thereof in the specification and claims of this invention are intended to cover non-exclusive inclusion, for example, including a series of components that are not necessarily limited to those explicitly listed, but may include other components that are not explicitly listed or that are inherent to the component.

[0110] In this invention, the terms "upper," "lower," "bottom," "top," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0111] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0112] Furthermore, the descriptions of "first," "second," etc., involved in this invention are 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 those features.

[0113] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0114] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing a wax model containing multi-angled cavities, characterized in that, Includes the following steps: Obtain a core; the core comprises multiple interconnected tubes distributed at multiple angles; A base wax model, a rear wax model, and a front wax model are obtained; wherein, the base wax model is provided with a first pipe groove, the rear wax model is provided with a second pipe groove, and the front wax model is provided with a third pipe groove; The core is assembled with the bottom wax model, the rear wax model and the front wax model, and the core is placed in the multi-angle cavity formed by the first pipe groove, the second pipe groove and the third pipe groove to obtain the wax model containing the multi-angle cavity. Wherein, at least a portion of the inner diameter of the tube body at its port is the same as the inner diameter of the multi-angle cavity at its port for a precise fit, and the remaining portion of at least a portion of the tube body is suspended in the multi-angle cavity. When the wall thickness of the wax mold corresponding to the suspended part of the tube is ≤10 mm, the distance between the suspended part of the tube and the cavity wall of the multi-angle cavity at the corresponding position is ≤1 mm. When the wall thickness of the wax mold corresponding to the suspended part of the tube is greater than 10 mm, the distance between the suspended part of the tube and the cavity wall of the multi-angled cavity at the corresponding position is less than 2 mm.

2. The method for preparing a wax model containing multi-angled cavities as described in claim 1, characterized in that, When the wall thickness of the wax mold corresponding to the suspended part of the tube is ≤3 mm, the distance between the suspended part of the tube and the cavity wall of the multi-angle cavity at the corresponding position is ≤0.5 mm.

3. The method for preparing a wax model containing multi-angled cavities as described in claim 1, characterized in that, The length of the portion of the tube with the same inner diameter at the port of the tube is ≥8 mm.

4. The method for preparing a wax model containing multi-angled cavities as described in claim 1, characterized in that, The core is prepared according to the cavity structure of the casting, and the plurality of tubes are divided into X tubes, Y tubes and Z tubes according to the extension direction of the tubes.

5. The method for preparing a wax model containing a multi-angled cavity as described in claim 4, characterized in that, The X-tube, Y-tube, and Z-tube represent the three-dimensional coordinate axes X, Y, and Z of the tube, and there is at least one X-tube, Y-tube, and Z-tube.

6. The method for preparing a wax model containing multi-angled cavities as described in claim 4, characterized in that, The wax model is designed according to the casting structure, and the bottom wax model is obtained by dividing the wax model at the corresponding position with the plane formed by the center lines of the X tube and the Y tube as the dividing surface. Using the plane formed by the centerline of the X tube and the part of the Z tube connected to the X tube as the dividing plane, the remaining wax model is separated at the corresponding position of the wax model to obtain the rear wax model and the front wax model.

7. The method for preparing a wax model containing a multi-angled cavity as described in claim 4, characterized in that, The assembly of the core with the bottom wax mold, the rear wax mold, and the front wax mold includes: The X tube, Y tube and part of the Z tube of the core are placed in the first pipe groove of the bottom wax mold to be positioned in the X, Y and Z directions. The rear wax mold and the front wax mold are respectively assembled onto the bottom wax mold, and the front wax mold and the rear wax mold are aligned so that a portion of the second pipe groove and a portion of the third pipe groove surround to form a cavity that sleeves a portion of the Z pipe body, and the first pipe groove and a portion of the third pipe groove and a portion of the second pipe groove surround to form a cavity that sleeves the X pipe body, the Y pipe body and a portion of the Z pipe body.

8. The method for preparing a wax model containing a multi-angled cavity as described in claim 7, characterized in that, The Z tube body also includes a Z1 tube body connected to the Y tube body, and the rear wax mold is further provided with a through-tube cavity for fitting the Z1 tube body.

9. The method for preparing a wax model containing a multi-angled cavity as described in claim 8, characterized in that, A portion of the Z1 tube body has the same inner diameter as the corresponding sleeve cavity for precise fit, while the remaining portion of the Z1 tube body is suspended in the sleeve cavity.

10. The method for preparing a wax model containing a multi-angled cavity as described in claim 1, characterized in that, The bottom wax model is provided with a first positioning protrusion and a second positioning protrusion. The first positioning protrusion is used for positioning and assembly with the rear wax model; the second positioning protrusion is used for positioning and assembly with the front wax model.

11. The method for preparing a wax model containing a multi-angled cavity as described in claim 1, characterized in that, At least a portion of the core tube passes through the multi-angled cavity and protrudes outside the wax model.

12. The method for preparing a wax model containing a multi-angled cavity as described in claim 1, characterized in that, Also includes: At least a portion of the seams between the base wax model, the rear wax model, and the front wax model are melted and fused together.

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