Preparation method of casting containing multi-dimensional pipe cavity

Abstract

The invention provides a preparation method of a casting containing a multi-dimensional pipe cavity, which comprises the following steps: combining and assembling a mold core and a plurality of block wax molds, so that the mold core is arranged in the multi-dimensional pipe cavity defined by the plurality of block wax molds, partial areas of at least partial pipe bodies of the mold core are suspended in the multi-dimensional pipe cavity, and the distance between the suspended part of the pipe body and the cavity wall of the multi-dimensional pipe cavity at the corresponding position is proportional to the wall thickness of the casting wax mold corresponding to the suspended part of the pipe body. According to the invention, a multi-dimensional matching relationship is formed by the plurality of pipe bodies distributed at multiple angles of the mold core and the block wax mold, so that the accurate matching of the block wax mold and the mold core is ensured, and the dimensional accuracy of the inner cavity of a later casting can be ensured by utilizing the dimensional accuracy of the mold core.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a method for preparing a casting containing a multi-dimensional lumen. Background Art

[0002] Titanium alloy precision castings are widely used in aviation, aerospace, weapons, and shipbuilding. Due to the requirements of their use environment, the quality of castings is required to be high. They are usually prepared by investment casting, which is also called lost wax casting. It usually refers to the use of fusible materials to make casting patterns, and several layers of refractory materials are coated on the surface of the pattern to make a shell. The pattern is melted and discharged from the shell, and the shell is obtained after high-temperature roasting. The casting is obtained by pouring molten metal into the shell, which generally includes wax pressing, shell preparation, dewaxing, pouring molten metal, and post-processing. Therefore, the quality of titanium alloy shell has an important influence on the molding of titanium alloy castings.

[0003] For titanium alloy precision castings, due to the need for unified structure and function, the internal structure is complex and often contains blind cavity structures. 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, during the wax pressing process of the casting, it is necessary to place the 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 areas and then splice them into an integral wax mold. Since the integral wax mold is spliced ​​together by multiple parts, when the block wax mold and the multi-angle tubular core are matched, due to the problem of manufacturing dimensional accuracy between the block wax mold and the core, assembly dislocation is prone to occur during splicing, resulting in the block wax mold being unable to be accurately assembled with the core, thereby affecting the dimensional accuracy of the casting. In addition, for the removal of the core, there may be a situation where the core is not removed cleanly or the inner wall of the casting is damaged. Since the casting is prepared by a shell mold and finally formed after the core is removed, the above processes have an impact on the overall molding, dimensional accuracy and inner cavity quality of the casting, seriously affecting the 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 method for preparing a casting containing a multi-dimensional tubular cavity. In the preparation method, a part of the tube body of the core is suspended in the air, so as to achieve precise assembly of the core and the wax mold. The multiple tube bodies distributed at multiple angles of the core and the block wax mold form a multi-dimensional matching relationship, which not only ensures the precise matching of 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.

[0005] To achieve the above object, the present invention provides a method for preparing a casting containing multi-dimensional cavities, which includes the following steps: preparing a core according to the cavity structure of the casting, the core including a plurality of tubes distributed at multiple angles; designing a plurality of segmented wax patterns according to the cavity structure of the casting, and assembling the core and the plurality of segmented wax patterns in combination, so that the core is placed in the multi-dimensional cavity formed by surrounding the plurality of segmented wax patterns to obtain a casting wax film; wherein, at least a partial region of at least some of the tubes of the core is suspended in the multi-dimensional cavity, and the distance between the suspended part of the tube and the cavity wall of the multi-dimensional cavity at the corresponding position is in a proportional relationship with the wall thickness of the casting wax pattern 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 cavity wall of the multi-dimensional cavity at the corresponding position, and x is the wall thickness of the wax pattern; preparing a mold shell on the surface of the casting wax film, and then roasting and dewaxing to obtain a casting mold shell; using the casting mold shell for molten liquid pouring, and removing the core after pouring to obtain the casting containing multi-dimensional cavities.

[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 a part of the ports of at least some of the tubes of the core is the same as the inner diameter of the ports of the multi-dimensional cavity at the corresponding position for precise fitting.

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

[0009] In some embodiments of the present invention, designing a plurality of segmented wax patterns according to the cavity structure of the casting includes: dividing the plurality of tubes of the core into X tubes, Y tubes, and Z tubes according to the extending direction of the tubes; taking the plane formed by the center lines of the X tubes and the Y tubes as the first dividing surface, and taking the plane formed by the center lines of the X tubes and a part of the Z tubes connected to the X tubes as the second dividing surface, and separating at the corresponding positions of the casting wax pattern to obtain the plurality of segmented wax patterns, and respectively serving as the bottom wax pattern, the rear wax pattern, and the front wax pattern.

[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, at least one Y tube, and at least one Z tube respectively.

[0011] In some embodiments of the present invention, a first pipeline groove is provided on the base 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 together form the multi-dimensional lumen.

[0012] In some embodiments of the present invention, the combined assembly of the core and the plurality of segmented wax molds includes: 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 and arranged 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 and part of the second 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.

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

[0014] 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.

[0015] In some embodiments of the present invention, preparing a mold shell on the surface of the casting wax film includes: coating the surface of the casting wax mold with a surface layer slurry, and then removing excess surface layer slurry; then performing surface layer sanding, and after drying, forming a surface layer mold shell; coating the surface of the surface layer mold shell with a back layer slurry, and removing excess back layer slurry; then performing back layer sanding, and after drying, forming a first layer of back layer mold shell; repeating the steps of coating the back layer slurry and sanding the back layer in the preparation of the back layer mold shell for multiple times to form a multi-layer back layer mold shell.

[0016] In some embodiments of the present invention, the dewaxing process includes: heating to a dewaxing temperature and then maintaining the temperature, so that the wax liquid flows out from a dewaxing port, and then the mold shell is cooled to room temperature along with the furnace.

[0017] In some embodiments of the present invention, the dewaxing temperature is 100° C. to 250° C., and the holding time is 3 h to 8 h.

[0018] In some embodiments of the present invention, the wax liquid flows out from the wax outlet in the middle or side of the bottom area of ​​the mold shell.

[0019] In some embodiments of the present invention, the roasting adopts a staged continuous roasting, including: heating to the first, second and third roasting temperatures in sequence, and keeping the temperature at the first, second and third roasting temperatures respectively, and then cooling and taking out of the furnace.

[0020] In some embodiments of the present invention, the first calcination temperature is 500° C. to 600° C., and the holding time is ≥ 3 h, preferably 3 h to 6 h.

[0021] In some embodiments of the present invention, the second calcination temperature is 600° C. to 800° C., and the holding time is ≥ 3 h, preferably 3 h to 8 h.

[0022] In some embodiments of the present invention, the third calcination temperature is 900° C. to 1200° C., and the holding time is ≥ 3 h, preferably 4 h to 12 h.

[0023] In some embodiments of the present invention, the cooling and taking out of the furnace is performed by cooling the furnace to room temperature and then taking out of the furnace, or cooling the furnace to below 450° C. and then taking out of the furnace.

[0024] In some embodiments of the present invention, at least a portion of the tube body of the core passes through the inner cavity of the shell and is exposed outside the casting shell.

[0025] In some embodiments of the present invention, before the shell is fired, the tube of the core passing through the shell cavity and exposed outside the casting shell is coated with the same material as the shell, and the coated area is connected to a part of the shell.

[0026] In some embodiments of the present invention, the coating area serves as a fixing area for the mold shell and the pouring equipment.

[0027] In some embodiments of the present invention, the casting shell is preheated before pouring, and the preheating temperature is 300°C to 500°C.

[0028] Advantages of the present invention:

[0029] In the present invention, the multiple tubes of the core 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.

[0030] The preparation method of the present invention adopts that at least part of the tube body of the core is suspended in the multi-angle special-shaped tube cavity, which can avoid the problem that the core cannot be assembled with the multi-dimensional tube cavity in a certain dimension due to the multiple tube bodies distributed at multiple angles.

[0031] The present invention can enhance the stability of the mold shell and the internal core through the fixing effect of the coating area. In the pouring process, when the molten metal is poured into the mold shell, since the coating area and the pouring equipment are fixed, and the core part of the tube body is exposed outside the mold shell and directly connected to the coating area, the stability of the core when impacted by the molten metal can be enhanced to prevent the core from being offset and affecting the inner cavity size of the casting. At the same time, in the centrifugal pouring process, the mold shell can be prevented from being offset on the centrifugal disk due to the centrifugal force during centrifugal pouring, resulting in turbulent flow of the molten metal or incomplete filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 A schematic diagram of the structure of the core in the embodiment provided by the present invention;

[0034] Figure 2 A schematic diagram of the structure of the bottom wax mold in the embodiment provided by the present invention;

[0035] 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;

[0036] Figure 4 A schematic diagram of the structure of the front wax mold in the embodiment provided by the present invention;

[0037] 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;

[0038] Figure 6 Schematic diagram of the rear wax mold structure in the embodiment provided by the present invention Figure 1 ;

[0039] Figure 7 Schematic diagram of the rear wax mold structure in the embodiment provided by the present invention Figure 2 ;

[0040] Figure 8 This is a schematic diagram of the casting wax mold structure in the embodiment provided by the present invention.

[0041] In the figure:

[0042] 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;

[0043] 2. Base wax mold; 21. First pipeline groove; 22. First positioning protrusion; 23. Second positioning protrusion;

[0044] 3. rear wax model; 31. second pipeline groove; 32. sleeve tube cavity;

[0045] 4. front wax model; 41. third pipeline groove;

[0046] 5. Splice the top surface. DETAILED DESCRIPTION

[0047] 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 accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0048] Since the overall 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 between the block wax mold and the core, assembly dislocation is easy to occur during splicing, resulting in the block wax mold being unable to be accurately assembled with the core, thereby affecting the dimensional accuracy of the casting. 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. At the same time, since the shell needs to be made through high-temperature baking, the high-temperature baking process has a certain impact on the core. For the shell with a core inside, after dewaxing, the core is only connected to the shell by the fixed end, and the rest is a suspended structure. During high-temperature baking, it is easy to crack or shift due to thermal expansion and contraction. The baking process needs to be controlled to stabilize the quality of the shell and core. For the removal of the core, there may be a situation where the core is not removed cleanly or the inner wall of the casting is damaged. Since the casting is prepared by a shell mold and finally formed after the core is removed, the above processes have an impact on the overall molding, dimensional accuracy and inner cavity quality of the casting, seriously affecting the reliability of the casting.

[0049] Reference Figure 1-Figure 8 As shown, the method for preparing a casting containing a multi-dimensional lumen in an embodiment of the present invention is carried out according to the following steps.

[0050] (1) Preparation of core 1.

[0051] In the embodiment of the present invention, the core 1 is prepared according to the casting lumen structure.

[0052] In the embodiment of the present invention, the core 1 includes a plurality of tubes distributed at multiple angles. The plurality of tubes are distributed at different orientations of X, Y, and Z three dimensions. It can be understood that the core 1 is a multi-angle pipe-like structure.

[0053] Figure 1 A specific structural schematic diagram of a core 1 is shown in FIG.

[0054] 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 .

[0055] 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.

[0056] 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 .

[0057] 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.

[0058] (2) Design multiple wax molds based on the casting lumen structure.

[0059] The casting wax mold containing a multi-dimensional tube cavity in the present invention is manufactured by assembling a plurality of divided wax molds and a core 1 .

[0060] In an embodiment of the present invention, a pipeline groove is formed on each block wax mold, and multiple block wax molds are combined to form a multi-dimensional tube cavity, and the core 1 is placed in the multi-dimensional tube cavity, so as to obtain a casting wax film containing a multi-dimensional tube cavity.

[0061] In certain embodiments of the present invention, designing a plurality of wax molds according to the casting lumen structure comprises the following steps:

[0062] Dividing the multiple tubes of the core 1 into X tubes, Y tubes, and Z tubes according to the extension direction of the tubes;

[0063] Using the plane formed by the center lines of the X tube body and the Y tube body as the first dividing plane, the bottom wax mold 2 is separated at the corresponding position of the casting wax mold; and

[0064] The plane formed by the center lines of the X tube body and the part of the Z tube body connected to the X tube body is used as the second dividing plane to separate the remaining wax mold at the corresponding position of the casting wax mold to obtain the rear wax mold 3 and the front wax mold 4.

[0065] 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.

[0066] Among them, a first pipe groove 21 is formed on the bottom wax mold 2, a second pipe groove 31 is formed on the rear wax mold 3, and a third pipe 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 multi-dimensional pipe cavity formed by enclosing the first pipe groove 21, the second pipe groove 31 and the third pipe groove 41.

[0067] (3) Assemble and fit the core 1 with a plurality of segmented wax molds to prepare a casting wax film.

[0068] In an embodiment of the present invention, at least a partial region of at least a part of the pipe body of the core 1 is suspended in the multi-dimensional pipe cavity, and the distance between the suspended part of the pipe body and the cavity wall of the multi-dimensional pipe cavity at the corresponding position is in a proportional relationship with the wall thickness of the casting wax mold corresponding to the suspended part of the pipe body: d = kx; where k is the proportionality coefficient, d is the distance between the suspended part of the pipe body and the cavity wall of the multi-dimensional pipe cavity at the corresponding position, and x is the wall thickness of the wax mold.

[0069] In an embodiment of the present invention, when 1 mm ≤ x ≤ 8 mm, 0.4 ≤ k ≤ 0.5.

[0070] In an embodiment of the present invention, when 8 mm < x ≤ 20 mm, 0.1 ≤ k ≤ 0.15.

[0071] 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.

[0072] In an embodiment of the present invention, at least a partial region of at least a part of the pipe body of the core 1 is suspended in the multi-dimensional pipe cavity, and the remaining part of at least a part of the pipe body has the same inner diameter as the inner diameter of the multi-dimensional pipe cavity at the corresponding position for precise fit.

[0073] In the present invention, the method of suspending at least a partial region of at least a part of the pipe body of the core 1 in the multi-dimensional pipe cavity can avoid the problem that the core 1 cannot be assembled with the multi-dimensional pipe cavity in a certain dimension due to having a plurality of pipe bodies with multi-angle distributions.

[0074] In the present invention, due to the multi-dimensional fitting relationship formed by the multi-angle distributed pipe bodies of the core 1 and the segmented wax molds, it can not only ensure the precise fit between the segmented wax molds and the core 1, but also ensure the dimensional accuracy of the inner cavity of the later casting by using the dimensional accuracy of the core 1.

[0075] In some embodiments of the present invention, the inner diameter of the port of at least a part of the pipe body of the core 1 is the same as the inner diameter of the port of the multi-dimensional pipe cavity for precise fit, and the remaining part of at least a part of the pipe body is suspended in the multi-dimensional pipe cavity.

[0076] In some embodiments of the present invention, the pipe body length of the part with the same inner diameter at the port of the pipe body is ≥ 8 mm to ensure high-precision fit.

[0077] The present invention adopts a method in which the ports of the multi-dimensional tube cavity are precisely matched with the ports of at least part of the tube body of the core 1, while the remaining area of ​​at least part of the tube body is suspended in the multi-dimensional tube cavity. This can avoid the problem that the core 1 cannot be assembled with the multi-dimensional tube cavity in a certain dimension due to having multiple tube bodies distributed at multiple angles.

[0078] In an embodiment of the present invention, when the wall thickness of the casting wax mold corresponding to the suspended portion of the tube body is ≤10mm, the spacing between the suspended portion of the tube body and the cavity wall of the multi-dimensional tube cavity at the corresponding position is ≤1mm. It can also be understood that the spacing between the suspended portion 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.

[0079] In an embodiment of the present invention, when the wall thickness of the casting wax mold corresponding to the suspended portion of the tube body is greater than 10 mm, the spacing between the suspended portion of the tube body and the cavity wall of the multi-dimensional tube cavity at the corresponding position is ≤2 mm. It can also be understood that the spacing between the suspended portion 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 ≤2 mm.

[0080] In certain embodiments of the present invention, when the wall thickness of the casting wax mold corresponding to the suspended portion of the tube body is ≤3 mm, the spacing between the suspended portion of the tube body and the cavity wall of the multi-dimensional tube cavity at the corresponding position is ≤0.5 mm. It can also be understood that the spacing between the suspended portion 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 ≤0.5 mm.

[0081] In the embodiment of the present invention, the spacing design between the suspended portion of the tube body and the cavity wall of the multi-dimensional tube cavity at the corresponding position can meet the assembly requirements of the core 1 and the shrinkage and deformation requirements of the wax mold.

[0082] As an embodiment of the present invention, the assembly of the core 1 and a plurality of wax mold blocks includes the following steps:

[0083] (3-1) 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.

[0084] Figure 3 A schematic structural diagram of a bottom wax mold 2 is shown. Figure 4 The schematic diagram of the combined structure of assembling the core 1 onto the bottom wax mold 2 is shown.

[0085] In an embodiment of the present invention, the core 1 is placed corresponding to the first pipeline groove 21 of the bottom wax mold 2, part of the tube body is placed in the first pipeline groove 21, and positioning in the three directions of X, Y, and Z is achieved to prevent the core 1 from sliding in the first pipeline groove 21.

[0086] In some embodiments of the present invention, the X tube body 11, the Y tube body 12 and part of the Z tube body 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.

[0087] As some embodiments of the present invention, the X tube body 11, the Y tube body 12 and the Z2 tube body 14 of the core 1 are placed in the first pipeline groove 21 of the bottom wax mold 2, and the X tube body 11 and the Y tube body 12 are respectively matched with the partial area of ​​the first pipeline groove 21 (which can be called the first core groove) to be positioned in the X and Y directions; the Z2 tube body 14 is matched with the partial area of ​​the first pipeline 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 three directions of X, Y and Z by the X tube body 11, the Y tube body 12 and the Z2 tube body 14 to prevent the core 1 from sliding in the first pipeline groove 21.

[0088] It is worth mentioning that the inner diameters of the ports of the X tube body 11 and the Y tube 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 are precisely matched.

[0089] The inner diameter of the rest of the X tube body 11 and the Y tube body 12 of the core 1 is smaller than the inner diameter of the first conduit groove 21 at the corresponding position. When the core 1 is assembled to the first conduit groove 21, the X tube body 11 and the Y tube body 12 are fixed only at the end of the first conduit groove 21, and the rest of the X tube body 11 and the Y tube body 12 are suspended in the first conduit groove 21.

[0090] 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.

[0091] In certain embodiments of the present invention, when the wall thickness of the casting wax mold corresponding to the suspended portion of the X-tube body 11 and the Y-tube body 12 is ≤10 mm, the spacing between the suspended portion of the X-tube body 11 and the Y-tube body 12 and the cavity wall of the multi-dimensional lumen at the corresponding position is ≤1 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 ≤1 mm.

[0092] In certain embodiments of the present invention, when the wall thickness of the casting wax mold 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 cavity wall of the multi-dimensional 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.

[0093] In certain embodiments of the present invention, when the wall thickness of the casting wax mold 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 cavity wall of the multi-dimensional 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.

[0094] (3-2) 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.

[0095] Figure 5 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 6 shown.

[0096] In an embodiment of the present invention, the third pipe groove 41 of the front wax mold 4 is arranged corresponding to a portion of the pipe body, and the front wax mold 4 is assembled on the bottom wax mold 2 .

[0097] 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 .

[0098] 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 .

[0099] 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.

[0100] 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.

[0101] The inner diameter of the rest of the third conduit groove 41 is larger than the inner diameter of the corresponding tube body. After the front wax model 4 is assembled on the bottom wax model 2, the X tube body 11, the Y tube body 12 and part of the Z tube body, such as the Z3 tube body 15 and the Z4 tube body 16, are fixed only through the end of the third conduit groove 41, and the rest of the X tube body 11, the Y tube body 12 and part of the Z tube body are suspended in the third conduit groove 41.

[0102] In certain embodiments of the present invention, when the wall thickness of the casting wax mold 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 third pipeline groove 41 at the corresponding position is ≤1 mm.

[0103] In certain embodiments of the present invention, when the wall thickness of the casting wax mold corresponding to the suspended portions 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 spacing between the suspended portions 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 third pipeline groove 41 at the corresponding position is ≤2 mm.

[0104] In certain embodiments of the present invention, when the wall thickness of the casting wax mold 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 third pipeline groove 41 at the corresponding position is ≤0.5 mm.

[0105] In an embodiment of the present invention, a second positioning protrusion 23 is further provided on the bottom wax mold 2 , and 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.

[0106] (3-3) 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.

[0107] Figure 7 A schematic diagram of the structure of a rear wax mold 3 is shown. Figure 1 , Figure 8 A schematic diagram of the structure of a rear wax mold 3 is shown. Figure 2 The overall wax mold structure after assembling the core 1, the bottom wax mold 2, the front wax mold 4 and the rear wax mold 3 is as follows Figure 8 shown.

[0108] In an embodiment of the present invention, the second pipeline groove 31 of the rear wax mold 3 is placed corresponding to the partial tube body of the core 1, and the rear wax mold 3 is assembled on the bottom wax mold 2, and the front wax mold 4 is arranged in a matched manner with the rear wax mold 3, so that the partial second pipeline groove 31 of the rear wax mold 3 and the partial third pipeline groove 41 of the front wax mold 4 are combined to form a tube cavity for sleeve-connecting the partial Z tube body, such as the Z3 tube body 15 and the Z4 tube body 16, and at the same time, the first pipeline groove 21 of the bottom wax mold 2 and the partial third pipeline groove 41 and the partial second pipeline groove 31 are combined to form a tube cavity for sleeve-connecting the X tube body 11, the Y tube body 12 and the partial Z tube body, such as the Z2 tube body 14.

[0109] The rear wax mold 3 is assembled on the bottom wax mold 2 and the front wax mold 4 after cooperating with the X tube body 11, Y tube body 12, and Z4 tube body 16 of the core 1. Therefore, the rear wax mold is positioned with the front wax mold 4 and the bottom wax mold 2 in the X and Y directions, and the rear wax mold 3 cannot move in the X and Y directions, thereby ensuring accurate assembly in the X and Y directions.

[0110] 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 matching pipe body, which is a precise match.

[0111] The inner diameter of the rest of the second pipe groove 31 is larger than the inner diameter of the corresponding tube body. When the rear wax model 3 is assembled on the bottom wax model 2, the X tube body 11, the Y tube body 12 and part of the Z tube body, such as the Z3 tube body 15 and the Z4 tube body 16, are fixed only through the port of the second pipe groove 31, and the rest of the X tube body 11, the Y tube body 12 and part of the Z tube body are suspended in the second pipe groove 31.

[0112] In some embodiments of the present invention, when the wall thickness of the casting wax mold 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.

[0113] In certain embodiments of the present invention, when the wall thickness of the casting wax mold 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 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 ≤2 mm.

[0114] In some embodiments of the present invention, when the wall thickness of the casting wax mold 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.

[0115] 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.

[0116] 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 multi-dimensional tube cavity at the corresponding position to precisely match.

[0117] 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.

[0118] 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 .

[0119] 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 .

[0120] In an embodiment of the present invention, at least part of the tube body of the core 1 passes through the multi-dimensional tube cavity and is exposed outside the casting wax mold, that is, part of the tube body of the core 1 is exposed outside the casting wax mold.

[0121] (3-4) 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.

[0122] 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 casting 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.

[0123] 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.

[0124] Finally remove the cover.

[0125] In an embodiment of the present invention, the tool for melting the joint seam can be an electric soldering iron.

[0126] (4) A shell mold is prepared on the surface of the casting wax film, and then dewaxing and sintering are performed to obtain a casting shell mold having a core 1.

[0127] (4-1) Shell preparation includes:

[0128] Apply the surface slurry to the surface of the casting wax mold, and then remove the excess surface slurry; then sprinkle sand on the surface, and after drying, form a surface shell;

[0129] Apply the back layer slurry on the surface of the surface shell, and remove the excess back layer slurry; then, sprinkle sand on the back layer, and after drying, form the first back layer shell;

[0130] The steps of coating the back layer slurry and sprinkling the back layer with sand in the preparation of the back layer shell are repeated many times to form a multi-layer back layer shell.

[0131] In the embodiment of the present invention, at least a portion of the tube body of the core 1 passes through the inner cavity of the mold shell and is exposed outside the casting mold shell.

[0132] It is worth mentioning that during the coating of the surface layer slurry and the back layer slurry, the tube body that passes through the multi-dimensional tube cavity and is exposed outside the casting wax mold is protected, and this part of the tube body of the core 1 is always kept exposed outside the casting shell.

[0133] It should be noted that before applying the slurry for the surface layer to prepare the mold shell, the surface of the wax mold can be cleaned to remove surface stains.

[0134] (4-2) Dewaxing the shell to remove the wax pattern inside the shell. In the embodiment of the present invention, the shell is heated to the dewaxing temperature and then kept warm, so that the wax liquid flows out from the dewaxing port, and then the shell is cooled to room temperature along with the furnace.

[0135] In an embodiment of the present invention, the dewaxing temperature is 100°C to 250°C, for example, it can be one of 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 165°C, 170°C, 178°C, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C or any value satisfying the above range. The heat preservation time is 3h to 8h, for example, it can be one of 3h, 4h, 5h, 6h, 7h, 8h or any value satisfying the above range.

[0136] In an embodiment of the present invention, the wax liquid flows out from the wax outlet in the middle or on the side of the bottom area of ​​the mold shell.

[0137] In an embodiment of the present invention, after the shell is dewaxed but before being fired, the tube of the core passing through the shell cavity and exposed outside the casting shell is coated with the same material as the shell, and the coated area is connected to a part of the shell.

[0138] By coating the tube body of the core that passes through the inner cavity of the shell and is exposed outside the shell of the casting after dewaxing of the shell and before firing, it is possible to avoid the situation where the dewaxing temperature is low and the coating area can only be partially dried but not ceramicized when heated at this temperature. The heating and cooling process of dewaxing involves thermal expansion and contraction of the coating area, which makes it impossible for the coating area to be completely connected with the shell and the tube body of the core that is exposed outside the shell.

[0139] (4-3) Segmented shell firing to remove the residual wax pattern in the shell and ceramicize the shell through high-temperature firing.

[0140] In the embodiment of the present invention, the temperature is raised to the first, second and third roasting temperatures in sequence, and kept at the first, second and third roasting temperatures respectively, and then cooled and taken out of the furnace.

[0141] In the embodiment of the present invention, the wax pattern remaining in the shell can be removed through the first firing, and the shell is completely ceramicized through the third firing.

[0142] In an embodiment of the present invention, the first roasting temperature is 500°C to 600°C, and the holding time is ≥ 3h, for example, the holding time is 3h to 6h. For example, the first roasting temperature can be 500°C, 510°C, 515°C, 518°C, 520°C, 540°C, 550°C, 560°C, 580°C, 590°C, 600°C, or any value that satisfies the above range. The holding time can be 3h, 3.2h, 3.5h, 4h, 5h, 6h, or any value that satisfies the above range.

[0143] In an embodiment of the present invention, the second roasting temperature is 600°C to 800°C, and the holding time is ≥ 3h, for example, the holding time is 3h to 8h. Exemplarily, the second roasting temperature can be 600°C, 620°C, 640°C, 650°C, 660°C, 680°C, 700°C, 720°C, 740°C, 750°C, 760°C, 780°C, 800°C or any value that satisfies the above range. The holding time can be 3h, 4h, 5h, 6h, 7h, 8h or any value that satisfies the above range.

[0144] In an embodiment of the present invention, the third roasting temperature is 900°C to 1200°C, and the holding time is ≥ 3h, for example, the holding time is 4h to 12h. For example, the third roasting temperature can be one of 900°C, 950°C, 1000°C, 1050°C, 1100°C, 1150°C, 1200°C, or any value satisfying the above range. The holding time can be one of 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, or any value satisfying the above range.

[0145] In the embodiment of the present invention, the cooling and taking out of the furnace is carried out by cooling the furnace to room temperature or by cooling the furnace to below 450° C.

[0146] (4-4) After the shell is fired, the quality of the casting shell is inspected.

[0147] In the embodiment of the present invention, an endoscope is used to inspect the inner cavity of the mold shell and the surface of the core 1 to prevent cracks on the surface of the core 1.

[0148] (4-5) Use an air gun to blow air to clean the inside of the casting shell.

[0149] (5) Casting.

[0150] (5-1) Preheat the casting shell.

[0151] In the embodiment of the present invention, the casting shell is preheated before the molten metal is poured. To ensure the stability of the core 1, the preheating temperature is in the range of 300°C to 500°C.

[0152] Exemplarily, the preheating temperature is one of 300°C, 310°C, 320°C, 330°C, 340°C, 350°C, 360°C, 370°C, 380°C, 390°C, 400°C, 410°C, 420°C, 430°C, 440°C, 450°C, 460°C, 470°C, 480°C, 490°C, 500°C or any value satisfying the above range.

[0153] (5-2) Casting.

[0154] In an embodiment of the present invention, the mold shell covering area can be used as a fixing area for the mold shell and the pouring equipment.

[0155] The fixing effect of the coating area can enhance the stability of the shell and the internal core. For the pouring process, when the molten metal is poured into the shell, the coating area and the pouring equipment are fixed, and the core part of the tube body is exposed outside the shell and directly connected to the coating area, which can enhance the stability of the core when it is impacted by the molten metal and prevent it from shifting and affecting the inner cavity size of the casting. At the same time, for the centrifugal casting method, it can prevent the shell from shifting on the centrifugal disk due to the centrifugal force during centrifugal casting, which leads to turbulent filling of the molten metal or incomplete filling.

[0156] In an embodiment of the present invention, the casting is poured by gravity or centrifugation.

[0157] (5-3) The core 1 in the casting is removed to obtain a casting with an inner cavity.

[0158] In the embodiment of the present invention, after the casting is poured, the core 1 inside the casting is removed.

[0159] In the embodiment of the present invention, the core 1 in the casting is removed by vibration or corrosion.

[0160] In the embodiment of the present invention, the core 1 remaining inside the casting is removed by grinding.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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 method for preparing a casting containing a multi-dimensional lumen, characterized in that: The method includes the following steps: Prepare a core according to the cavity structure of the casting, where the core includes a plurality of pipe bodies distributed at multiple angles; Design a plurality of segmented wax patterns according to the cavity structure of the casting, and assemble the core and the plurality of segmented wax patterns, so that the core is placed in a multi-dimensional cavity formed by surrounding the plurality of segmented wax patterns to obtain a casting wax film; wherein, at least a partial region of at least some of the pipe bodies of the core is suspended in the multi-dimensional cavity, and the distance between the suspended portion of the pipe body and the cavity wall of the multi-dimensional cavity at the corresponding position is in a proportional relationship with the wall thickness of the casting wax pattern corresponding to the suspended portion of the pipe body: d = kx; in the formula, k is a proportionality coefficient, d is the distance between the suspended portion of the pipe body and the cavity wall of the multi-dimensional cavity at the corresponding position, and x is the wall thickness of the wax pattern; Prepare a mold shell on the surface of the casting wax film, and then dewax and roast it to obtain a casting mold shell; Use the casting mold shell for molten liquid pouring, and remove the core after pouring to obtain the casting containing the multi-dimensional cavity.

2. The method for preparing a casting containing a multi-dimensional lumen according to 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 method for preparing a casting containing a multi-dimensional lumen according to claim 2, characterized in that: The inner diameter of at least a part of the ports of the pipe bodies of the core is the same as the inner diameter of the ports of the multi-dimensional cavity at the corresponding positions for precise fitting; Preferably, the length of the pipe body with the same inner diameter at the port of the pipe body is ≥ 8mm.

4. The method for preparing a casting containing a multi-dimensional lumen according to claim 1, characterized in that: Designing a plurality of segmented wax patterns according to the cavity structure of the casting includes: Divide the plurality of pipe bodies of the core into X pipe bodies, Y pipe bodies, and Z pipe bodies according to the extending direction of the pipe bodies; Use the plane formed by the center lines of the X pipe body and the Y pipe body as the first dividing surface, and use the plane formed by the center lines of the X pipe body and a part of the Z pipe body connected to the X pipe body as the second dividing surface to divide the corresponding positions of the casting wax pattern to obtain the plurality of segmented wax patterns, and respectively serve as the bottom wax pattern, the rear wax pattern, and the front wax pattern; Preferably, a first pipe groove is provided on the bottom wax pattern, a second pipe groove is provided on the rear wax pattern, and a third pipe groove is provided on the front wax pattern; the first pipe groove, the second pipe groove, and the third pipe groove surround and form the multi-dimensional cavity.

5. The method for preparing a casting containing a multi-dimensional lumen according to claim 4, characterized in that: The combined assembly of the core and the plurality of segmented wax patterns includes: Correspondingly place the X pipe body, Y pipe body, and part of the Z pipe body of the core in the first pipe groove of the bottom wax pattern for positioning in the X, Y, and Z directions; Assemble the front wax pattern and the rear wax pattern to the bottom wax pattern respectively, and the front wax pattern and the rear wax pattern are arranged in an opposing manner, so that a part of the second pipe groove and a part of the third pipe groove surround and form a cavity sleeving a part of the Z pipe body, and the first pipe groove, a part of the third pipe groove, and a part of the second pipe groove surround and form a cavity sleeving the X pipe body, the Y pipe body, and a part of the Z pipe body.

6. The method for preparing a casting containing a multi-dimensional lumen according to claim 5, 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 provided on the rear wax pattern; Preferably, a partial area of ​​the Z1 tube body has the same inner diameter as the sleeve lumen at the corresponding position for precise matching, and the remaining partial area of ​​the Z1 tube body is suspended in the sleeve lumen.

7. The method for preparing a casting containing a multi-dimensional lumen according to claim 1, characterized in that: The preparation of the mold shell on the surface of the casting wax film comprises: Apply the surface slurry to the surface of the casting wax mold, and then remove the excess surface slurry; then sprinkle sand on the surface, and after drying, form a surface shell; Apply the back layer slurry on the surface of the surface shell, and remove the excess back layer slurry; then, sprinkle sand on the back layer, and after drying, form the first back layer shell; The steps of coating the back layer slurry and sprinkling the back layer with sand in the preparation of the back layer shell are repeated many times to form a multi-layer back layer shell.

8. The method for preparing a casting containing a multi-dimensional lumen according to claim 1, characterized in that: The dewaxing process comprises: heating to the dewaxing temperature and then keeping the temperature, so that the wax liquid flows out from the dewaxing port, and then the shell is cooled to room temperature along with the furnace; Preferably, the roasting is carried out by staged continuous roasting, including: heating to the first, second and third roasting temperatures in sequence, and keeping the temperature at the first, second and third roasting temperatures respectively, and then cooling and taking out of the furnace; Preferably, the first calcination temperature is 500°C to 600°C, and the holding time is ≥ 3h, preferably 3h to 6h; Preferably, the second calcination temperature is 600°C to 800°C, and the holding time is ≥ 3h, preferably 3h to 8h; Preferably, the third calcination temperature is 900° C. to 1200° C., and the holding time is ≥ 3 h, preferably 4 h to 12 h; Preferably, the cooling and unloading is performed by cooling the furnace to room temperature or cooling the furnace to below 450°C. Preferably, the dewaxing temperature is 100°C to 250°C, and the holding time is 3h to 8h; Preferably, the wax liquid flows out from the wax outlet in the middle or side of the bottom area of ​​the shell.

9. The method for preparing a casting containing a multi-dimensional lumen according to claim 1, characterized in that: At least part of the tube body of the core passes through the inner cavity of the shell and is exposed outside the casting shell; Preferably, before the shell is fired, the tube body of the core passing through the inner cavity of the shell and exposed outside the casting shell is coated with the same material as the shell, and the coated area is connected to a part of the shell; Preferably, the coating area serves as a fixing area for the mold shell and the pouring equipment.

10. The method for preparing a casting containing a multi-dimensional lumen according to claim 1, characterized in that: Before pouring, the casting shell is preheated at a temperature of 300°C to 500°C.

Images