Wax model forming method with combined channel cavity

Abstract

This invention provides a wax pattern forming method with a combined channel cavity. The method includes the following steps: assembling a core, a base wax pattern, a rear wax pattern, and a front wax pattern together to obtain a wax pattern; wherein the core is placed within a connecting cavity formed by the base wax pattern, the rear wax pattern, and the front wax pattern, and at least a portion of the core's tube body is suspended in the connecting cavity, and the distance between the suspended portion of the tube body and the corresponding inner wall of the connecting cavity is proportional to the wall thickness of the wax pattern corresponding to the suspended portion of the tube body: d = kx; where k is a proportionality coefficient, d is the distance between the suspended portion of the tube body and the corresponding inner wall of the connecting cavity, and x is the wax pattern wall thickness. The preparation method of this invention ensures precise matching between the segmented wax patterns and the core, and also utilizes the dimensional accuracy of the core to guarantee the dimensional accuracy of the inner cavity of the subsequent casting.

Description

Technical Field

[0001] This invention relates to the field of wax model preparation technology, and specifically to a wax model forming method containing a combined channel cavity. Background Technology

[0002] Titanium alloy precision castings used in aviation, aerospace, weaponry, and shipbuilding 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 wax pattern forming method with a combined channel cavity. The preparation method of the present invention can not only ensure the precise matching of the segmented wax pattern and the core, but also use the dimensional accuracy of the core to ensure the dimensional accuracy of the cavity of the casting in the later stage.

[0005] To achieve the above object, the present invention provides a method for forming a wax mold containing a combined channel inner cavity, which includes the following steps: assembling the obtained core, bottom wax mold, rear wax mold and front wax mold together to obtain the wax mold containing the combined channel inner cavity; wherein, the core includes a plurality of tubes, the core is placed in the communicating tube cavity formed by surrounding the bottom wax mold, the rear wax mold and the front wax mold, at least part of the tubes of the core are suspended in the communicating tube cavity, and the distance between the suspended part of the tube and the inner side wall of the communicating tube cavity at the corresponding position is proportional to the wall thickness of the wax mold corresponding to the suspended part of the tube: d = kx; where k is the proportionality coefficient, d is the distance between the suspended part of the tube and the inner side wall of the communicating tube cavity at the corresponding position, and x is the wall thickness of the wax mold.

[0006] In some embodiments of the present invention, when 1mm ≤ x ≤ 8mm, 0.4 ≤ k ≤ 0.5; when 8mm < x ≤ 20mm, 0.1 ≤ k ≤ 0.15.

[0007] In some embodiments of the present invention, the inner diameter of the port of at least part of the tubes of the core is the same as the inner diameter of the port of the communicating tube cavity at the corresponding position for precise fit.

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

[0009] In some embodiments of the present invention, the core is made according to the casting tube cavity structure, the multiple tubes of the core are distributed at multiple angles, and the multiple 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 tubes, Y tubes, and Z tubes represent the three-dimensional directions of the X-axis, Y-axis, and Z-axis of the coordinate axes where the tubes are located, and there is at least one X tube, one Y tube, and one Z tube respectively.

[0011] In some embodiments of the present invention, the wax mold is designed according to the casting structure, and the bottom wax mold is separated at the corresponding position of the wax mold with the plane formed by the center lines of the X tubes and the Y tubes as the dividing surface; the remaining wax mold is separated into the rear wax mold and the front wax mold at the corresponding position of the wax mold with the plane formed by the center lines of the X tubes and part of the Z tubes connected to the X tubes as the dividing surface.

[0012] In some embodiments of the present invention, a first pipeline groove is provided on the bottom wax mold, a second pipeline groove is provided on the rear wax mold, and a third pipeline groove is provided on the front wax mold; the first pipeline groove, the second pipeline groove and the third pipeline groove surround to form the communicating tube cavity.

[0013] 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 front wax mold and the rear 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.

[0014] 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.

[0015] 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.

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

[0017] 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.

[0018] In some embodiments of the present invention, the wax model forming method further includes melting and fusing at least a portion of the joints between the base wax model, the rear wax model, and the front wax model together.

[0019] Advantages of this invention:

[0020] The method of preparing the core in this invention, in which at least a portion of the tube body is suspended in the connecting cavity, can avoid the problem that the core, which has multiple tube bodies, especially multiple tube bodies distributed at multiple angles, cannot be assembled with the connecting cavity in a certain dimension.

[0021] The present invention employs a method of precisely fitting the port of the multi-angled 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-angled cavity. This method avoids the problem that the core, due to having multiple tubes distributed at multiple angles, cannot be assembled with the communicating cavity in a certain dimension.

[0022] In this invention, the multiple tubes of the core, especially the multiple tubes distributed at multiple angles, form a multi-dimensional matching relationship with the segmented wax mold, which not only ensures the precise matching 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

[0023] 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:

[0024] Figure 1 This is a schematic diagram of the core structure in an embodiment provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the bottom wax mold in the embodiments provided by the present invention;

[0026] Figure 3 This is a schematic diagram of the structure after the bottom wax mold and the core are assembled in the embodiment provided by the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the front wax model in an embodiment provided by the present invention;

[0028] Figure 5 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;

[0029] Figure 6 Schematic diagram of the post-wax mold structure in the embodiments provided by the present invention Figure 1 ;

[0030] Figure 7 Schematic diagram of the post-wax mold structure in the embodiments provided by the present invention Figure 2 ;

[0031] Figure 8 This is a schematic diagram of a wax model structure containing a combined channel cavity in an embodiment of the present invention.

[0032] In the picture:

[0033] 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;

[0034] 2. Bottom wax mold; 21. First pipe groove; 22. First positioning protrusion; 23. Second positioning protrusion;

[0035] 3. Rear wax mold; 31. Second pipe groove; 32. Through-sleeve cavity;

[0036] 4. Front wax model; 41. Third pipe groove;

[0037] 5. Assemble the top surface. Detailed implementation manner

[0038] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0039] In the present invention, the wax mold containing the combined channel lumen is prepared by assembling multiple segmented wax molds and a core 1.

[0040] Among them, the core 1 includes multiple tube bodies; multiple segmented wax molds are designed according to the structure of the casting cavity. For example, multiple segmented wax molds are respectively used as the front wax mold 4, the rear wax mold 3, and the bottom wax mold 2. The core 1 is placed in the communication lumen formed by enclosing the bottom wax mold 2, the rear wax mold 3, and the front wax mold 4. At least part of the tube bodies of the core 1 are suspended in the communication lumen, and the distance between the suspended part of the tube body and the inner side wall of the communication lumen at the corresponding position is proportional to the wall thickness of the wax mold corresponding to the suspended part of the tube body: d = kx;

[0041] In the formula, k is the proportionality coefficient, d is the distance between the suspended part of the tube body and the inner side wall of the communication lumen at the corresponding position, and x is the wall thickness of the wax mold.

[0042] In the embodiments of the present invention, when 1 mm ≤ x ≤ 8 mm, 0.4 ≤ k ≤ 0.5.

[0043] In the embodiments of the present invention, when 8 mm < x ≤ 20 mm, 0.1 ≤ k ≤ 0.15.

[0044] In the embodiments of the present invention, the designed distance d according to the proportionality formula can meet the assembly requirements of the core 1 and also meet the requirements of wax mold shrinkage and deformation.

[0045] Exemplarily, when the wall thickness of the wax mold corresponding to the suspended part of the tube body ≤ 10 mm, the distance between the suspended part of the tube body and the inner side wall of the corresponding communication lumen ≤ 1 mm.

[0046] Exemplarily, when the wall thickness of the wax mold corresponding to the suspended part of the tube body > 10 mm, the distance between the suspended part of the tube body and the inner side wall of the corresponding communication lumen ≤ 2 mm.

[0047] For example, when the wall thickness of the wax mold corresponding to the suspended part of the tube is ≤3mm, the distance between the suspended part of the tube and the inner wall of the connecting cavity at the corresponding position is ≤0.5mm.

[0048] In this invention, the method of suspending at least a portion of the tube body of the core 1 in the connecting cavity can avoid the problem that the core 1 cannot be assembled with the connecting cavity in a certain dimension due to having multiple tube bodies, especially multiple tube bodies distributed at multiple angles.

[0049] In this invention, the multiple tubes of the core 1, especially the multiple tubes distributed at multiple angles, form a multi-dimensional fit with the segmented wax mold, which can ensure the precise fit between the segmented wax mold and the core 1, and can also use the dimensional accuracy of the core 1 to ensure the dimensional accuracy of the inner cavity of the casting later.

[0050] In an embodiment of the present invention, the inner diameter at the port of at least a portion of the core 1 is the same as the inner diameter at the port of the corresponding connecting cavity for a precise fit.

[0051] In this invention, the port of the connecting tube is precisely matched 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 in the connecting tube. This method avoids the problem that the core 1, which has multiple tube bodies, especially multiple tube bodies distributed at multiple angles, cannot be assembled with the connecting tube in a certain dimension, thus achieving precise assembly.

[0052] In some embodiments of the present invention, the length of the tube body with the same inner diameter at the port is ≥8mm to ensure high-precision fit.

[0053] In an embodiment of the present invention, a first channel groove 21 is formed on the bottom wax mold 2, a second channel groove 31 is formed on the rear wax mold 3, and a third channel groove 41 is formed on the front wax mold 4. The core 1 is assembled with the bottom wax mold 2, the rear wax mold 3, and the front wax mold 4, and the core 1 is placed in the communicating cavity formed by the first channel groove 21, the second channel groove 31, and the third channel groove 41.

[0054] The wax mold forming method containing the combined channel cavity in this invention is carried out according to the following steps.

[0055] (1) Obtain core 1.

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

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

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

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

[0060] In an embodiment of the present invention, Z1 tube 13 is connected to Y tube 12, Z2 tube 14 is connected to X tube 11, and Z1 tube 13 and Z2 tube 14 are arranged in opposite directions.

[0061] In an embodiment of the present invention, tube Z3 15 is connected at the junction of tube X 11 and tube Y 12, and tube Z4 16 is connected at the junction of tube X 11 and tube Y 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 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 an internal cavity of combined channels.

[0064] As 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 surface.

[0065] Using the plane formed by the centerline of the X tube 11 and the part of the Z tube connected to the X tube 11 as the dividing plane, the remaining wax model is divided at the corresponding position of the wax model to obtain the rear wax model 3 and the front wax model 4.

[0066] 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.

[0067] (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.

[0068] Figure 2 A schematic diagram of the structure of a base wax mold 2 is shown. Figure 3 A schematic diagram of the assembly structure of the core 1 being assembled onto the bottom wax mold 2 is shown.

[0069] In an embodiment of the present invention, a first pipe groove 21 is provided on the bottom wax mold 2. The core 1 is placed corresponding to the first pipe groove 21, and part of the pipe body is placed in the first pipe groove 21, and positioning in the X, Y, and Z directions is achieved to prevent the core 1 from sliding in the first pipe groove 21.

[0070] In certain embodiments of the present invention, the X pipe body 11, Y pipe body 12, and part of the Z pipe body of the core 1 are correspondingly placed in the first pipe groove 21 of the bottom wax mold 2 for positioning in the X, Y, and Z directions.

[0071] As some embodiments of the present invention, the X pipe body 11, Y pipe body 12, and Z2 pipe body 14 of the core 1 are correspondingly placed in the first pipe groove 21 of the bottom wax mold 2. The X pipe body 11 and Y pipe body 12 respectively correspond to and cooperate with partial areas (which can be called the first core grooves) of the first pipe groove 21 for positioning in the X and Y directions; the Z2 pipe body 14 corresponds to and cooperates with partial areas (which can be called the first positioning grooves) of the first pipe groove 21 for positioning in the Z direction. At this time, the core 1 is positioned in the X, Y, and Z directions through the X pipe body 11, Y pipe body 12, and Z2 pipe body 14, preventing the core 1 from sliding in the first pipe groove 21.

[0072] It is worth mentioning that the inner diameters at the ports of the X pipe body 11 and Y pipe body 12 of the core 1 are the same as the inner diameters at the corresponding positions of the ports of the first pipe groove 21, which is a precise fit.

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

[0074] In an embodiment of the present invention, for the wall thickness x of the wax mold corresponding to the suspended parts of the X pipe body 11 and Y pipe body 12, and the distance d between the suspended parts of the X pipe body 11 and Y pipe body 12 and the inner side walls of the corresponding communicating pipe cavities, there is a proportional relationship: d = kx; and when 1 mm ≤ x ≤ 8 mm, 0.4 ≤ k ≤ 0.5; when 8 mm < x ≤ 20 mm, 0.1 ≤ k ≤ 0.15 ≤ 1 mm.

[0075] In certain embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended parts of the X pipe body 11 and Y pipe body 12 ≤ 10 mm, the distance between the suspended parts of the X pipe body 11 and Y pipe body 12 and the inner side walls of the corresponding communicating pipe cavities ≤ 1 mm, which can also be understood as the distance between the suspended parts of the X pipe body 11 and Y pipe body 12 and the groove walls of the corresponding first pipe groove 21 ≤ 1 mm.

[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 >10mm, the distance between the suspended portion of the X-tube 11 and Y-tube 12 and the inner wall of the corresponding connecting cavity 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.

[0077] 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 inner wall of the corresponding connecting cavity is ≤0.5mm. 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 ≤0.5mm.

[0078] In some embodiments of the present invention, the inner diameter of the Z2 tube 14 is the same as the inner diameter of the first pipe groove 21 at the corresponding position for a precise fit, ensuring accurate positioning in the Z direction.

[0079] (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.

[0080] Figure 4 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 5 As shown.

[0081] In an embodiment of the present invention, a third pipe groove 41 is provided on the front wax mold 4, the third pipe groove 41 is provided in a corresponding part of the pipe body, and the front wax mold 4 is assembled onto the bottom wax mold 2.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] The inner diameter of the remaining part of the third pipe groove 41 is larger than the inner diameter of the pipe body that is correspondingly fitted with it. After the current wax mold 4 is assembled onto the bottom wax mold 2, only the X pipe body 11, the Y pipe body 12, and part of the Z pipe body, such as the Z3 pipe body 15 and the Z4 pipe body 16, are fixed through the port of the third pipe groove 41. The remaining parts of the X pipe body 11, the Y pipe body 12, and part of the Z pipe body are in a suspended state within the third pipe groove 41.

[0087] In an embodiment of the present invention, for the wall thickness x of the wax mold corresponding to the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body, and the distance d between the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body and the inner side wall of the communicating pipe cavity at the corresponding position, x and d are in a proportional relationship: d = kx; and when 1 mm ≤ x ≤ 8 mm, 0.4 ≤ k ≤ 0.5; when 8 mm < x ≤ 20 mm, 0.1 ≤ k ≤ 0.15 ≤ 1 mm.

[0088] In certain embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body ≤ 10 mm, the distance between the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body and the groove wall of the third pipe groove 41 at the corresponding position ≤ 1 mm.

[0089] In certain embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body > 10 mm, the distance between the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body and the groove wall of the third pipe groove 41 at the corresponding position ≤ 2 mm.

[0090] In certain embodiments of the present invention, when the wall thickness of the wax mold corresponding to the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body ≤ 3 mm, the distance between the suspended parts of the X pipe body 11, the Y pipe body 12, the Z3 pipe body 15, and the Z4 pipe body and the groove wall of the third pipe groove 41 at the corresponding position ≤ 0.5 mm.

[0091] In an embodiment of the present invention, a second positioning protrusion 23 is further provided on the bottom wax mold 2. The second positioning protrusion 23 is used for positioning and assembling with the front wax mold 4, so that the front wax mold 4 and the bottom wax mold 2 form a positioning assembly.

[0092] (2 - 3) Assemble the rear wax mold 3 onto the bottom wax mold 2 to obtain a combined structure of the core 1, the bottom wax mold 2, the front wax mold 4, and the rear wax mold 3.

[0093] Figure 6 Shows a schematic structure of a rear wax mold 3 Figure 1 , Figure 7 shows a schematic structure of a rear wax mold 3 Figure 2 ; the overall structure after assembling the core 1, bottom wax mold 2, front wax mold 4 and rear wax mold 3 is as Figure 8 shown.

[0094] In an embodiment of the present invention, a second pipe groove 31 is provided on the rear wax mold 3. A part of the pipe body of the second pipe groove 31 corresponding to the core 1 is placed, and the rear wax mold 3 is assembled onto the bottom wax mold 2. The front wax mold 4 is arranged in alignment with the rear wax mold 3, so that a part of the second pipe groove 31 of the rear wax mold 3 and a part of the third pipe groove 41 of the front wax mold 4 enclose to form a socket part for the Z pipe body, such as the lumen of the Z3 pipe body 15 and the Z4 pipe body 16. At the same time, the first pipe groove 21 of the bottom wax mold 2 and a part of the third pipe groove 41 and a part of the second pipe groove 31 enclose to form a socket for the X pipe body 11, Y pipe body 12 and a part of the Z pipe body, such as the lumen of the Z2 pipe body 14.

[0095] After the rear wax mold 3 is assembled onto the bottom wax mold 2 and the front wax mold 4 through cooperation with the X pipe body 11, Y pipe body 12, and Z4 pipe body 16 of the core 1, the rear wax mold is positioned in the X and Y directions with respect to the front wax mold 4 and the bottom wax mold 2. The rear wax mold 3 cannot move in the X and Y directions, ensuring precise assembly in the X and Y directions.

[0096] It is worth mentioning that the inner diameter at the port of the second pipe groove 31 of the rear wax mold 3 is the same as the inner diameter at the port of the corresponding mating pipe body, which is a precision fit.

[0097] The inner diameter of the remaining part of the second pipe groove 31 is larger than the inner diameter of the corresponding mating pipe body. When the rear wax mold 3 is assembled onto the bottom wax mold 2, only the X pipe body 11, Y pipe body 12, and a part of the Z pipe body, such as the Z3 pipe body 15 and the Z4 pipe body 16, are fixed through the port of the second pipe groove 31. The remaining parts of the X pipe body 11, Y pipe body 12, and a part of the Z pipe body are in a suspended state within the second pipe groove 31.

[0098] In an embodiment of the present invention, for the wall thickness x of the wax mold corresponding to the suspended parts of the X pipe body 11, Y pipe body 12, Z3 pipe body 15, and Z4 pipe body 16, and the distance d between the suspended parts of the X pipe body 11, Y pipe body 12, Z3 pipe body 15, and Z4 pipe body 16 and the inner side wall of the communicating lumen at the corresponding positions, x and d are in a proportional relationship: d = kx; and when 1 mm ≤ x ≤ 8 mm, 0.4 ≤ k ≤ 0.5; when 8 mm < x ≤ 20 mm, 0.1 ≤ k ≤ 0.15 ≤ 1 mm.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] It can be understood that the inner diameter of tube 14 of Z2 is the same as the inner diameter of the connecting lumen at the corresponding position for precise fit.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] In an embodiment of the present invention, at least a portion of the core 1 passes through the communicating cavity and protrudes outside the wax mold, that is, a portion of the core 1 protrudes from the wax mold.

[0108] (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.

[0109] 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.

[0110] 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.

[0111] Finally, remove the envelope.

[0112] In an embodiment of the present invention, a soldering iron can be selected as the tool for melting the seam.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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 wax mold forming method containing a combined channel cavity, characterized in that, It includes the following steps: Assemble the obtained core, bottom wax mold, rear wax mold and front wax mold together to obtain the wax mold containing the combined channel inner cavity; wherein, The core includes multiple tubes, which are placed within a connecting cavity formed by the bottom wax mold, the rear wax mold, and the front wax mold. At least a portion of the tubes is suspended in the connecting cavity, and the distance between the suspended portion of the tube and the inner wall of the connecting cavity at the corresponding position is proportional to the wall thickness of the wax mold corresponding to the suspended portion of the tube. d = kx ; In the formula, k This is the proportionality coefficient. d The distance between the suspended portion of the pipe and the inner wall of the corresponding connecting cavity. x For the wall thickness of the wax model; When 1 mm ≤ x ≤ 8 mm, then 0.4 ≤ k ≤ 0.5; when │8 mm < x ≤ 20 mm, then 0.1 ≤ k ≤ 0.

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2. The wax mold forming method with a combined channel cavity as described in claim 1, characterized in that, The inner diameter of the port of at least part of the tube body of the core is the same as the inner diameter of the port of the corresponding connecting tube cavity for precise fitting.

3. The wax mold forming method with a combined channel cavity as described in claim 2, characterized in that, The length of the tube body with the same inner diameter at the port of the tube body ≥ 8 mm.

4. The wax model forming method with a combined channel cavity as described in claim 1, characterized in that, Manufacture the core according to the casting tube cavity structure. The multiple tube bodies of the core are distributed at multiple angles, and the multiple tube bodies are divided into X tube bodies, Y tube bodies, and Z tube bodies according to the tube body extension direction.

5. The wax model forming method with a combined channel cavity as described in claim 4, characterized in that, Design the wax mold according to the casting structure, and use the plane formed by the center lines of the X tube body and the Y tube body as the dividing surface to divide the wax mold at the corresponding position to obtain the bottom wax mold; Use the plane formed by the center line of the X tube body and part of the Z tube body connected to the X tube body as the dividing surface to divide the remaining wax mold at the corresponding position of the wax mold to obtain the rear wax mold and the front wax mold.

6. The wax model forming method with a combined channel cavity as described in claim 5, characterized in that, A first pipeline groove is provided on the bottom wax mold, a second pipeline groove is provided on the rear wax mold, and a third pipeline groove is provided on the front wax mold; the first pipeline groove, the second pipeline groove and the third pipeline groove jointly enclose the connecting tube cavity.

7. The wax model forming method with a combined channel cavity as described in claim 6, characterized in that, The combination and assembly of the core with the bottom wax mold, the rear wax mold and the front wax mold includes: Place the X tube body, Y tube body and part of the Z tube body of the core in the first pipeline groove of the bottom wax mold for positioning in the X, Y, and Z directions; Assemble the front wax mold and the rear wax mold to the bottom wax mold respectively, and the front wax mold and the rear wax mold are arranged in alignment, so that part of the second pipeline groove and part of the third pipeline groove jointly enclose the tube cavity sleeving part of the Z tube body, and so that the first pipeline groove, part of the third pipeline groove and part of the second pipeline groove jointly enclose the tube cavity sleeving the X tube body, the Y tube body and part of the Z tube body.

8. The wax model forming method with a combined channel cavity as described in claim 7, characterized in that, The Z tube body further includes a Z1 tube body connected to the Y tube body, and a through tube cavity for sleeving the Z1 tube body is further provided on the rear wax mold.

9. The wax model forming method with a combined channel cavity as described in claim 8, characterized in that, Part of the area of the Z1 tube body has the same inner diameter as the through tube cavity at the corresponding position for precise fitting, and the remaining part of the area of the Z1 tube body is suspended in the through tube cavity.

10. The wax model forming method with a combined channel cavity as described in claim 1, characterized in that, At least part of the tube body of the core passes through the connecting tube cavity and exposes outside the wax mold.

11. The wax model forming method with a combined channel cavity as described in claim 1, characterized in that, A first positioning protrusion and a second positioning protrusion are provided on the bottom wax mold. The first positioning protrusion is used for positioning and assembling with the rear wax mold; the second positioning protrusion is used for positioning and assembling with the front wax mold.

12. The wax model forming method with a combined channel cavity as described in claim 1, characterized in that, The wax mold forming method further includes: Melt at least part of the splicing seams between the bottom wax mold, the rear wax mold and the front wax mold and fuse them together.

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