Forming method of wax mould containing combined channel inner cavity

Abstract

The invention provides a forming method of a wax mold containing a combined channel inner cavity, which comprises the following steps: combining and splicing a mold core, a bottom wax mold, a rear wax mold and a front wax mold together to obtain a wax mold; wherein the mold core is arranged in a communicating pipe cavity defined by the bottom wax mold, the rear wax mold and the front wax mold, and part of the area of at least part of a pipe body of the mold core is arranged in the communicating pipe cavity in a suspended mode; the distance between the suspended part of the pipe body and the inner side wall of the communicating pipe cavity at the corresponding position is proportional to the wall thickness of the wax mould corresponding to the suspended part of the pipe body: d = kx; in the formula, k is a proportionality coefficient, d is the distance between the suspended part of the pipe body and the inner side wall of the communicating pipe cavity at the corresponding position, and x is the wall thickness of the wax mold. By the adoption of the preparation method, it is guaranteed that the block wax mold is accurately matched with the mold core, and the size precision of an inner cavity of a casting in the later period can be guaranteed through the size precision of the mold core.

Description

Technical Field

[0001] The invention relates to the technical field of wax mold preparation, and in particular to a wax mold forming method containing a combined channel inner cavity. Background Art

[0002] Titanium alloy precision castings used in the fields of aviation, aerospace, weapons, ships, etc. are generally prepared by investment casting. Investment casting is also called lost wax casting. It usually refers to the use of fusible materials to make casting patterns, coating the surface of the patterns with several layers of refractory materials to make a shell, melting the patterns and discharging them from the shell, and obtaining the shell after high-temperature roasting. The casting is obtained by pouring molten metal into the shell. The process generally includes wax pressing, shell preparation, dewaxing, pouring molten metal, and post-processing. For titanium alloy precision castings, due to the need for unified structure and function, the internal structure is complex and often includes a blind cavity structure. Ceramic cores are required to form complex inner cavities. After the casting is poured, the cores are removed to form the inner cavity structure of the casting. Therefore, in the process of wax pressing of castings, it is necessary to place a core in the wax pressing mold and then inject wax to form a wax mold with a core. For castings with complex inner cavities, it is usually necessary to prepare block wax molds in different regions and then splice them into an integral wax mold.

[0003] Since the whole wax mold is made up of multiple parts, when the block wax mold and the multi-angle tubular core are matched, due to the problem of manufacturing dimensional accuracy of the block wax mold and the core, assembly dislocation is easy to occur during splicing. For example, some wax molds in the block wax mold can be assembled with the core, but after assembly, the remaining block wax molds cannot be completely matched with the core due to the dimensional accuracy of the wax mold and the dimensional accuracy of the core, resulting in the block wax mold being unable to be accurately assembled with the core. At the same time, for wax molds with cores inside, during the wax pressing process, they are easily impacted by the wax liquid, causing the core to shift and break, resulting in the inability to form the casting or directly affecting the dimensional accuracy of the complex structure of the inner cavity of the casting, which has a great impact on the service life and reliability of the casting. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the main purpose of the present invention is to provide a wax mold forming method containing a combined channel inner cavity. The preparation method of the present invention can not only ensure the precise matching of the divided wax mold and the core, but also use the dimensional accuracy of the core to ensure the dimensional accuracy of the inner cavity of the later casting.

[0005] To achieve the above object, the present invention provides a method for forming a wax mold with 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 with the combined channel inner cavity; wherein, the core includes a plurality of tubes, the core is placed in the communication 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 communication tube cavity, and the distance between the suspended part of the tube and the inner side wall of the communication tube cavity at the corresponding position is in a proportional relationship with 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 communication 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 at least part of the ports of the tubes of the core is the same as the inner diameter of the ports of the communication tube cavity at the corresponding position for precise fitting.

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

[0009] In some embodiments of the present invention, the core is made according to the cavity structure of the casting, 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 separation plane; 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 separation plane.

[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 communication tube cavity.

[0013] In some embodiments of the present invention, the core is assembled with the bottom wax mold, the rear wax mold and the front wax mold, including: placing the X tube body, the Y tube body and part of the Z tube body of the core in the first pipeline groove of the bottom wax mold to position them in the X, Y and Z directions; assembling the front wax mold and the rear wax mold onto the bottom wax mold, respectively, and the front wax mold and the rear wax mold are matched, so that part of the second pipeline groove and part of the third pipeline groove are combined to form a tube cavity that sleeves part of the Z tube body, and the first pipeline groove and part of the third pipeline groove are combined to form a tube cavity that sleeves the X tube body, the Y tube body and part of the Z tube body.

[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 sleeve cavity for sleeve-connecting the Z1 tube body.

[0015] In some embodiments of the present invention, a partial area of ​​the Z1 tube body has the same inner diameter as the sleeve lumen at a corresponding position for precise matching, and the remaining area of ​​the Z1 tube body is suspended in the sleeve lumen.

[0016] In some embodiments of the present invention, at least a portion of the tube body of the core passes through the connecting tube cavity and is exposed outside the wax mold.

[0017] In some embodiments of the present invention, a first positioning protrusion and a second positioning protrusion are provided on the base wax mold, wherein the first positioning protrusion is used for positioning and assembling with the rear wax mold; and the second positioning protrusion is used for positioning and assembling with the front wax mold.

[0018] In some embodiments of the present invention, the wax mold forming method further comprises: melting at least a portion of the joints between the bottom wax mold, the rear wax mold, and the front wax mold, and fusing them together.

[0019] Advantages of the present invention:

[0020] The preparation method of the present invention adopts that at least part of the tube body of the core is suspended in the connecting tube cavity, which can avoid the problem that the core cannot be assembled with the connecting tube cavity in a certain dimension due to having multiple tube bodies, especially multiple tube bodies distributed at multiple angles.

[0021] The present invention adopts a preparation method in which the port of the multi-angle tube cavity is precisely matched with the port of at least part of the tube body of the core, and the rest of at least part of the tube body is suspended in the multi-angle tube cavity. This can avoid the problem that the core cannot be assembled with the connected tube cavity in a certain dimension due to having multiple tube bodies distributed at multiple angles.

[0022] In the present invention, the multiple tubes of the core, especially the multiple tubes distributed at multiple angles, form a multi-dimensional matching relationship with the block wax mold, which not only ensures the precise matching between the block wax mold and the core, but also can use the dimensional accuracy of the core to ensure the dimensional accuracy of the inner cavity of the later casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. In the accompanying drawings:

[0024] Figure 1 A schematic diagram of the structure of the core in the embodiment provided by the present invention;

[0025] Figure 2 A schematic diagram of the structure of the bottom wax mold in the embodiment provided by the present invention;

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

[0027] Figure 4 A schematic structural diagram of the front wax mold in the embodiment provided by the present invention;

[0028] Figure 5 A schematic diagram of the structure of the core, the bottom wax mold and the front wax mold after being assembled in the embodiment provided by the present invention;

[0029] Figure 6 Schematic diagram of the rear wax mold structure in the embodiment provided by the present invention Figure 1 ;

[0030] Figure 7 Schematic diagram of the rear wax mold structure in the embodiment provided by the present invention Figure 2 ;

[0031] Figure 8 A schematic diagram of the wax mold structure containing a combined channel cavity in the embodiment provided by the present invention.

[0032] In the figure:

[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. Base wax mold; 21. First pipeline groove; 22. First positioning protrusion; 23. Second positioning protrusion;

[0035] 3. rear wax model; 31. second pipeline groove; 32. sleeve tube cavity;

[0036] 4. front wax model; 41. third pipeline groove;

[0037] 5. Splice the top surface. Specific embodiments

[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 a plurality of segmented wax molds and a core 1.

[0040] Among them, the core 1 includes a plurality of tubes; a plurality of segmented wax molds are designed according to the structure of the casting cavity. For example, a plurality of 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 tube cavity formed by surrounding the bottom wax mold 2, the rear wax mold 3, and the front wax mold 4. At least a part of the tubes of the core 1 is suspended in the communication tube cavity, and the distance between the suspended part of the tube and the inner side wall of the communication tube cavity at the corresponding position is in a proportional relationship with the wall thickness of the wax mold corresponding to the suspended part of the tube: d = kx;

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

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

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

[0044] In an embodiment of the present invention, the distance d designed according to the proportional relationship 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 ≤ 10 mm, the distance between the suspended part of the tube and the inner side wall of the corresponding communication tube cavity ≤ 1 mm.

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

[0047] Exemplarily, when the wall thickness of the wax model corresponding to the suspended portion of the tube body is ≤3 mm, the spacing between the suspended portion of the tube body and the inner wall of the connecting tube cavity at the corresponding position is ≤0.5 mm.

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

[0049] In the present invention, the multiple tubes of the core 1, especially the multiple tubes distributed at multiple angles, form a multi-dimensional matching relationship with the block wax mold, which can not only ensure the precise matching between the block wax mold and the core 1, but also use the dimensional accuracy of the core 1 to ensure the dimensional accuracy of the inner cavity of the later casting.

[0050] In an embodiment of the present invention, the inner diameter of the port of at least a portion of the tube body of the core 1 is the same as the inner diameter of the port communicating with the tube cavity at the corresponding position for precise matching.

[0051] The present invention adopts a method in which the port of the connecting tube cavity is precisely matched with the port of at least part of the tube body of the core 1, and the rest of at least part of the tube body is suspended in the connecting tube cavity. This can avoid the problem that the core 1 cannot be assembled with the connecting tube cavity in a certain dimension due to having multiple tube bodies, especially multiple tube bodies distributed at multiple angles, and achieve precise assembly.

[0052] In certain embodiments of the present invention, the length of the tube body at the end of the tube body with the same inner diameter is ≥8 mm to ensure high-precision and precise matching.

[0053] In the embodiment of the present invention, a first pipeline groove 21 is formed on the bottom wax mold 2, a second pipeline groove 31 is formed on the rear wax mold 3, and a third pipeline 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 a connecting tube cavity surrounded by the first pipeline groove 21, the second pipeline groove 31 and the third pipeline groove 41.

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

[0055] (1) Obtain a core 1.

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

[0057] In the embodiment of the present invention, the multiple tubes in the core 1 are distributed at multiple angles, and the multiple tubes are distributed at different orientations of X, Y, and Z three dimensions, which can be understood as the core 1 being a multi-angle pipeline structure.

[0058] Figure 1A specific structural schematic diagram of a core 1 is shown in FIG.

[0059] The multiple tubes constituting the core 1 are divided into an X tube 11 , a Y tube 12 , and a Z tube according to the tube extension direction, wherein the Z tube includes a Z1 tube 13 , a Z2 tube 14 , a Z3 tube 15 and a Z4 tube 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 between the X tube body 11 and the Y tube body 12 , and the Z4 tube body 16 is connected to the connection between the X tube body 11 and the Y tube body 12 .

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

[0063] (2) Design a wax mold according to the structure of the casting, and separate the wax mold as a whole to obtain a bottom wax mold 2, a rear wax mold 3, and a front wax mold 4; then assemble the core 1 with the obtained bottom wax mold 2, the rear wax mold 3, and the front wax mold 4 to obtain a wax mold with a combined channel cavity inside.

[0064] As an embodiment of the present invention, the bottom wax mold 2 is obtained by dividing the corresponding position of the wax mold using the plane formed by the center lines of the X tube body 11 and the Y tube body 12 as a dividing plane;

[0065] The remaining wax mold is separated at the corresponding position of the wax mold to obtain the rear wax mold 3 and the front wax mold 4 by using the plane formed by the center line of the X tube body 11 and the part of the Z tube body connected to the X tube body 11 as the dividing plane.

[0066] Therefore, the mutual splicing of the front wax mold 4, the rear wax mold 3 and the bottom wax mold 2 inevitably involves the positioning of the wax mold in the three-dimensional directions of X, Y and Z, which is conducive to ensuring that the wax mold containing the multi-angle core is accurately positioned in the three-dimensional directions during the splicing process.

[0067] (2-1) Assemble the core 1 onto the bottom wax mold 2 to obtain a combined structure of the core 1 and the bottom wax mold 2.

[0068] Figure 2 A schematic structural diagram of a bottom wax mold 2 is shown. Figure 3 The schematic diagram of the combined structure of assembling the core 1 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 and cooperate with part of the area of the first pipe groove 21 (which can be called the first core groove) for positioning in the X and Y directions; the Z2 pipe body 14 corresponds and cooperates with part of the area of the first pipe groove 21 (which can be called the first positioning groove) 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 of the ports of the X pipe body 11 and Y pipe body 12 of the core 1 are the same as the inner diameters of the ports of the first pipe groove 21 at the corresponding positions, 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. When 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 wall of the corresponding connecting pipe cavity, 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.

[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 wall of the corresponding connecting pipe cavity ≤ 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 wall of the corresponding first pipe groove 21 ≤ 1 mm.

[0076] In certain embodiments of the present invention, when the wall thickness of the wax model corresponding to the suspended portion of the X tube body 11 and the Y tube body 12 is greater than 10 mm, the spacing between the suspended portion of the X tube body 11 and the Y tube body 12 and the inner wall of the communicating lumen at the corresponding position is ≤2 mm, which can also be understood as the spacing between the suspended portion of the X tube body 11 and the Y tube body 12 and the groove wall of the first pipeline groove 21 at the corresponding position is ≤2 mm.

[0077] In certain embodiments of the present invention, when the wall thickness of the wax model corresponding to the suspended portion of the X tube body 11 and the Y tube body 12 is ≤3 mm, the spacing between the suspended portion of the X tube body 11 and the Y tube body 12 and the inner wall of the communicating lumen at the corresponding position is ≤0.5 mm, which can also be understood as the spacing between the suspended portion of the X tube body 11 and the Y tube body 12 and the groove wall of the first pipeline groove 21 at the corresponding position is ≤0.5 mm.

[0078] In certain embodiments of the present invention, the inner diameter of the Z2 tube body 14 is identical to the inner diameter of the first pipe groove 21 at the corresponding position for precise matching, thereby ensuring accurate positioning in the Z direction.

[0079] (2-2) Assemble the front wax mold 4 onto the bottom wax mold 2 to obtain a combined structure of the core 1, the bottom wax mold 2 and the front wax mold 4.

[0080] Figure 4 A schematic diagram of the structure of a front wax mold 4 is shown. The structure after the core 1, the bottom wax mold 2 and the front wax mold 4 are assembled is as shown in FIG. Figure 5 shown.

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

[0082] In some embodiments of the present invention, a partial area of ​​the third pipe groove 41 corresponds to a partial area of ​​the first pipe groove 21 and is enclosed for sleeve connection with the X tube body 11 and the Y tube body 12 .

[0083] In some embodiments of the present invention, a partial area of ​​the third pipe groove 41 is arranged corresponding to the Z3 pipe body 15 and the Z4 pipe body 16 .

[0084] The front wax mold 4 is assembled on the bottom wax mold 2 after cooperating with the X tube body 11, Y tube body 12, and Z2 tube body 14 of the core 1. 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, thereby 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 matching pipe body, which is a precise match.

[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 thereto. 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 16, 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 16 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 16 ≤ 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 16 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 16 > 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 16 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 16 ≤ 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 16 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 structural schematic 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, the bottom wax mold 2, the front wax mold 4 and the 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, 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, the 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 by cooperating with the X pipe body 11, the Y pipe body 12 and the 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 cooperating 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 cooperating pipe body. After the rear wax mold 3 is assembled onto the bottom wax mold 2, only the X pipe body 11, the 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, the 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, the Y pipe body 12, the Z3 pipe body 15 and the Z4 pipe body 16, 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 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 model corresponding to the suspended portion of the X tube body 11, the Y tube body 12, the Z3 tube body 15, and the Z4 tube body 16 is ≤10 mm, the spacing between the suspended portion of the X tube body 11, the Y tube body 12, the Z3 tube body 15, and the Z4 tube body 16 and the groove wall of the second pipeline groove 31 at the corresponding position is ≤1 mm.

[0100] In some embodiments of the present invention, when the wall thickness of the wax model corresponding to the suspended portion of the X tube body 11, the Y tube body 12, the Z3 tube body 15, and the Z4 tube body 16 is greater than 10 mm, the distance between the suspended portion of the X tube body 11, the Y tube body 12, the Z3 tube body 15, and the Z4 tube body 16 and the groove wall of the second pipeline groove 31 at the corresponding position is ≤2 mm.

[0101] In some embodiments of the present invention, when the wall thickness of the wax model corresponding to the suspended portion of the X tube body 11, the Y tube body 12, the Z3 tube body 15, and the Z4 tube body 16 is ≤3 mm, the spacing between the suspended portion of the X tube body 11, the Y tube body 12, the Z3 tube body 15, and the Z4 tube body 16 and the groove wall of the second pipeline groove 31 at the corresponding position is ≤0.5 mm.

[0102] In some embodiments of the present invention, the inner diameter of the Z2 tube body 14 is the same as the inner diameter of the second pipe groove 31 at the corresponding position for precise matching.

[0103] Of course, it can be understood that the inner diameter of the Z2 tube body 14 is the same as the inner diameter of the connecting tube cavity at the corresponding position to precisely match.

[0104] In the embodiment of the present invention, at least one sleeve cavity 32 is further provided on the rear wax mold 3, and the sleeve cavity 32 is sleeved on the corresponding Z tube body. Through the sleeve cavity 32, the front wax mold 4 and the rear wax mold 3 are fixed as a whole, the front wax mold 4 and the rear wax mold 3 are restricted from moving in the Z direction, and the front wax mold 4 and the rear wax mold 3 are positioned in the Z direction.

[0105] As an embodiment of the present invention, the rear wax mold 3 is provided with a sleeve cavity 32 for sleeve-connecting the Z1 tube body 13 .

[0106] It is worth mentioning that a part of the Z1 tube body 13 has the same inner diameter as the sleeve lumen 32 at the corresponding position for precise matching, and the rest of the Z1 tube body 13 is suspended in the sleeve lumen 32 .

[0107] In the embodiment of the present invention, at least part of the tube body of the core 1 passes through the connecting tube cavity and is exposed outside the wax mold, that is, part of the tube body of the core 1 is exposed outside the wax mold.

[0108] (2-4) Melt at least part of the joints between the bottom wax mold 2, the rear wax mold 3, and the front wax mold 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 block wax mold are spliced ​​and the wax mold is exposed. The material of the cover is an elastic material that can tightly fix at least two block wax molds and the core 1.

[0110] Then, at the joint top surface 5, the wax model in the local area of ​​the joint seam is melted, the joint seam is fused together, and the divided wax models are joined into a whole.

[0111] Finally remove the cover.

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

[0113] It should be noted that the terms "comprises" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, the inclusion of a series of components is not necessarily limited to those components explicitly listed, but may include other components that are not explicitly listed or inherent to the components.

[0114] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "bottom", "top", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0115] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0116] In addition, the descriptions of "first", "second", etc. involved in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0117] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0118] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection 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 with the combined channel inner cavity; wherein, The core includes a plurality of pipe bodies, the core is placed in the communicating pipe cavity formed by enclosing the bottom wax mold, the rear wax mold and the front wax mold, at least part of the pipe bodies of the core are suspended in the communicating pipe cavity, and the distance between the suspended part of the pipe body and the inner side wall of the communicating pipe cavity at the corresponding position is in a proportional relationship with the wall thickness of the wax mold corresponding to the suspended part of the pipe body: d = kx; In the formula, k is the proportionality coefficient, d is the distance between the suspended part of the pipe body and the inner side wall of the communicating pipe cavity at the corresponding position, and x is the wall thickness of the wax mold.

2. The wax mold forming method containing a combined channel cavity as claimed in claim 1, characterized in that: When 1mm ≤ x ≤ 8mm, 0.4 ≤ k ≤ 0.5; when 8mm < x ≤ 20mm, 0.1 ≤ k ≤ 0.

15.

3. The wax mold forming method containing a combined channel inner cavity according to claim 1, characterized in that: The inner diameter of the port of at least part of the pipe bodies of the core is the same as the inner diameter of the port of the communicating pipe cavity at the corresponding position for precise fit; Preferably, the length of the pipe body with the same inner diameter at the port of the pipe body ≥ 8mm.

4. The wax mold forming method containing a combined channel cavity as claimed in claim 1, characterized in that: The core is made according to the cavity structure of the casting, and the multiple pipe bodies of the core are distributed at multiple angles, and the multiple pipe bodies are divided into X pipe bodies, Y pipe bodies, and Z pipe bodies according to the extending direction of the pipe bodies.

5. The wax mold forming method containing a combined channel inner cavity as claimed in claim 4, characterized in that: Design the wax mold according to the casting structure, and separate the bottom wax mold at the corresponding position of the wax mold with the plane formed by the center lines of the X pipe body and the Y pipe body as the dividing surface; Separate the remaining wax mold at the corresponding position of the wax mold with the plane formed by the center line of the X pipe body and part of the Z pipe bodies connected to the X pipe body as the dividing surface to obtain the rear wax mold and the front wax mold; Preferably, a first pipeline groove is arranged on the bottom wax mold, a second pipeline groove is arranged on the rear wax mold, and a third pipeline groove is arranged on the front wax mold; the first pipeline groove, the second pipeline groove and the third pipeline groove enclose the communicating pipe cavity.

6. The wax mold forming method containing a combined channel cavity as claimed in claim 5, 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 pipe body, Y pipe body and part of the Z pipe bodies 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 enclose a pipe cavity sleeving part of the Z pipe bodies, and the first pipeline groove, part of the third pipeline groove and part of the second pipeline groove enclose a pipe cavity sleeving the X pipe body, the Y pipe body and part of the Z pipe bodies.

7. The wax mold forming method having a combined channel inner cavity according to claim 6, characterized in that: The Z pipe body further includes a Z1 pipe body connected to the Y pipe body, and a through pipe cavity for sleeving the Z1 pipe body is further arranged on the rear wax mold; Preferably, part of the area of the Z1 pipe body is the same as the inner diameter of the through pipe cavity at the corresponding position for precise fit, and the remaining part of the Z1 pipe body is suspended in the through pipe cavity.

8. The wax mold forming method having a combined channel inner cavity according to claim 1, characterized in that: At least part of the pipe bodies of the core pass through the communicating pipe cavity and expose outside the wax mold.

9. The wax mold forming method having a combined channel inner cavity according to claim 1, characterized in that: The bottom wax mold is provided with a first positioning protrusion and a second positioning protrusion, wherein the first positioning protrusion is used for positioning and assembling with the rear wax mold; and the second positioning protrusion is used for positioning and assembling with the front wax mold.

10. The wax mold forming method having a combined channel inner cavity according to claim 1, characterized in that: The wax mold forming method also includes: At least part of the joints between the bottom wax model, the rear wax model and the front wax model are melted and fused together.

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