Preparation method of high-precision wax mold with pipe cavity and mold

Abstract

The invention relates to the technical field of metal casting, in particular to a preparation method of a high-precision wax mold with a pipe cavity and a mold, and the preparation method sequentially comprises the following steps of mold core preparation, wax mold design, block wax mold preparation and block wax mold assembly. The wax mold design comprises the step of dividing a casting wax mold into a bottom wax mold, a rear wax mold and a front wax mold; the block wax mold splicing comprises the steps that a mold core, a bottom wax mold, a rear wax mold and a front wax mold are spliced through a splicing tool, the mold core is arranged in a multi-angle pipe cavity defined by a first pipeline groove, a second pipeline groove and a third pipeline groove, and an integral wax mold with the multi-angle pipe cavity is obtained; wherein the partial area of at least part of the pipe body of the mold core is the same as the inner diameter of the multi-angle pipe cavity at the corresponding position so as to be precisely matched, and the other partial area of the mold core is arranged in the multi-angle pipe cavity in a suspended mode. By means of the preparation method, it can be guaranteed that the block wax mold is accurately matched with the mold core, and the size precision of an inner cavity of a later casting can be guaranteed through the size precision of the mold core.

Description

Technical Field

[0001] The invention relates to the technical field of metal casting, and in particular to a method for preparing a high-precision wax mold with a tubular cavity and a mold. Background Art

[0002] Titanium alloy precision castings are generally prepared by investment casting, which 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 into the shell, and obtaining the shell after high-temperature roasting. The casting is obtained by pouring molten metal into the shell, which generally includes the steps of 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 wax pressing process 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 areas 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.

[0004] Therefore, the present invention is proposed. Summary of the invention

[0005] 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 high-precision wax mold with a tubular cavity and a mold. The preparation method of the present invention can not only ensure the precise matching of the divided wax mold and the core, but also utilize the dimensional accuracy of the core to ensure the dimensional accuracy of the inner cavity of the later casting.

[0006] In order to achieve the above-mentioned object, a method for preparing a high-precision wax mold with a tubular cavity is provided in the first aspect of the present invention, which comprises the following steps in sequence: preparing a core, designing a wax mold, preparing a wax mold in blocks, and assembling the wax mold in blocks;

[0007] The core preparation includes preparing the core according to the shape of the casting tube cavity, and the core includes a plurality of tube bodies distributed at multiple angles;

[0008] The wax mold design includes separating the casting wax mold into a bottom wax mold, a rear wax mold and a front wax mold, wherein the bottom wax mold is formed with a first pipeline groove, the rear wax mold is formed with a second pipeline groove, and the front wax mold is formed with a third pipeline groove;

[0009] The block wax model assembly includes using a splicing tool to splice the core with the bottom wax model, the rear wax model, and the front wax model, and placing the core in a multi-angle tube cavity formed by the first pipeline groove, the second pipeline groove, and the third pipeline groove to obtain an integral wax model with a multi-angle tube cavity;

[0010] Among them, at least a part of the tube body of the core has the same inner diameter as the multi-angle tube cavity at the corresponding position for precise matching, and the remaining part of the core is suspended in the multi-angle tube cavity.

[0011] The wax pattern preparation method provided by the present invention may also have the following additional technical features:

[0012] In a specific embodiment of the present invention, the wax mold is separated into a bottom wax mold, a rear wax mold and a front wax mold, comprising:

[0013] The tube body of the core is divided into an X tube body, a Y tube body, and a Z tube body according to the extension direction;

[0014] The X tube body, the Y tube body, and the Z tube body represent the three-dimensional directions of the coordinate axes X-axis, Y-axis, and Z-axis where the tube body is located. There is at least one of each of the X tube body, Y tube body, and Z tube body.

[0015] The bottom wax mold is separated at the corresponding position of the casting wax mold by taking the plane formed by the center lines of the X tube body and the Y tube body as the dividing plane; the remaining wax mold is separated into the rear wax mold and the front wax mold at the corresponding position of the casting wax mold by taking 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 as the dividing plane.

[0016] In a specific embodiment of the present invention, the splicing tool comprises a bottom plate having a fixing ring, a sliding plate slidably connected to the bottom plate, and a top pressure plate arranged corresponding to the fixing ring;

[0017] Using a splicing tool to splice the core with the bottom wax mold, the rear wax mold and the front wax mold comprises the following steps in sequence:

[0018] Fixing the rear wax model: installing the rear wax model on the fixing ring of the base plate accordingly;

[0019] Core fixing: placing the X tube body, Y tube body and Z tube body of the core in the second core groove of the rear wax mold;

[0020] Fixing the front wax mold: installing the front wax mold on the rear wax mold, and enclosing part of the third core groove and part of the second core groove to form a tube cavity that sleeves part of the Z tube body;

[0021] Fixing the bottom wax mold: placing the bottom wax mold on the sliding plate, and pushing the sliding plate to splice the bottom wax mold with the rear wax mold and the front wax mold, and making the first pipeline groove, part of the third core groove and part of the second core groove enclose to form a tube cavity sleeved with the X tube body and the Z tube body;

[0022] Fixing of top pressure plate: Install the top pressure plate on the front wax mold and the bottom wax mold, connect it with the fixing ring through the screw rod, and fix it with the nut;

[0023] Melting and fixing: melting at least part of the joints between the bottom wax model, the rear wax model and the front wax model so as to fuse them together.

[0024] In a specific embodiment of the present invention, the Z tube body also includes a Z3 tube body connected to the Y tube body, and the rear wax mold is also provided with a sleeve cavity for sleeve-fitting the Z3 tube body; a partial area of ​​the Z3 tube body has the same inner diameter as the sleeve cavity at the corresponding position for precise matching, and a partial area of ​​the Z3 tube body is suspended in the sleeve cavity.

[0025] In a specific embodiment of the present invention, splicing the core with the base wax mold, the rear wax mold and the front wax mold using a splicing tool also includes a sleeve fixing step located between the base wax mold fixing step and the melting fixing step, and the sleeve fixing step includes using an elastic sleeve to be sleeved on the outside of the tubular splicing structure formed by the first pipe groove, the second pipe groove and / or the third pipe groove.

[0026] In a specific embodiment of the present invention, the splicing tool further includes a plurality of support columns, wherein the support columns are arranged on the outer periphery of the fixing ring, and the support columns are used to support the second pipeline groove of the rear wax model.

[0027] In a specific embodiment of the present invention, a positioning block, a supporting block and a side baffle are provided on the sliding plate, and the bottom wax mold is arranged on the sliding plate through the positioning block, the supporting block and the side baffle.

[0028] In a specific embodiment of the present invention, a screw hole is provided in the fixing ring, and a bolt is provided on the top pressure plate. The bolt passes through the center holes of the front and rear membranes and the rear wax mold and is connected to the screw hole with a bolt. The top pressure plate is fixed with a nut on the bolt, and the front and rear membranes and the rear wax mold are fixed.

[0029] In a specific embodiment of the present invention, a first positioning protrusion and a second positioning protrusion are provided on the bottom wax mold, and the bottom wax mold fixing step includes fitting and positioning the first positioning protrusion with the rear wax mold, and fitting and positioning the second positioning protrusion with the front wax mold.

[0030] In a specific embodiment of the present invention, at least a portion of the tube body of the core passes through the multi-angle tube cavity and is exposed outside the integral wax mold.

[0031] A second aspect of the present invention provides a high-precision wax mold with a tubular cavity, which is prepared by any of the preparation methods described above.

[0032] The method for preparing a high-precision wax mold with a tube cavity provided by the present invention is to precisely match the inner diameter of at least part of the tube body of the core with the multi-angle tube cavity at the corresponding position, and at least part of the tube body and part of the area thereof are suspended in the multi-angle tube cavity, thereby reducing the precision requirements for the wax mold of the casting with the multi-angle tube cavity, and improving the difficulty of assembling the casting wax mold and the core, thereby avoiding the problem that the core cannot be assembled with the core groove in a certain dimension due to the multi-angle tube cavity. And by splicing the bottom wax mold, the rear wax mold, and the front wax mold with the help of splicing tooling, the splicing efficiency can be improved, and the splicing accuracy can be improved.

[0033] The present invention utilizes the plane formed by the center lines of the X tube body, Y tube body and Z tube body of the core as the dividing plane of the wax mold, and divides the wax mold containing the multi-angle tube cavity into the front wax mold, the rear wax mold and the bottom wax mold. Therefore, the mutual splicing of the front wax mold, the rear wax mold and the bottom wax mold 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.

[0034] The present invention provides a sleeve tube cavity structure, which is sleeved on the corresponding Z tube body. The front wax model and the rear wax model are fixed as a whole through the sleeve tube cavity, and the movement of the front wax model and the rear wax model in the Z direction is restricted, thereby ensuring the integrity of the front wax model and the rear wax model spliced ​​in sequence, and forming the positioning of the front wax model and the rear wax model in the Z direction.

[0035] In the present invention, the multi-angle distributed tube body of the core forms a multi-dimensional matching relationship with the block wax mold, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1-2 Schematic diagram of the overall structure of the casting wax mold from different viewing angles in an embodiment of the present invention;

[0038] Figure 3 It is a structural schematic diagram of a core in an embodiment of the present invention;

[0039] Figure 4 for Figure 1 Schematic diagram of the structure of the midsole wax mold;

[0040] Figure 5-6 for Figure 1 Schematic diagram of the structure of the middle front wax model;

[0041] Figure 7-8 for Figure 1 Schematic diagram of the structure of the middle and rear wax model;

[0042] Fig. 9 It is a structural schematic diagram of a splicing tool in an embodiment of the present invention;

[0043] Figure 10-13 It is a schematic diagram of the coordination state between the splicing tooling and the casting wax model in an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 1-core; 11-X pipe body; 12-Y pipe body; 13-Z pipe body; 14-Z1 pipe body; 15-Z2 pipe body; 16-Z3 pipe body; 17-Z4 pipe body;

[0046] 2- bottom wax mold, 21- first pipeline groove, 22- first positioning protrusion, 23- second positioning protrusion;

[0047] 3-rear wax model, 31-second pipeline groove, 32-sleeve tube cavity;

[0048] 4-front wax model, 41-third pipeline slot;

[0049] 5-joining tooling, 51-bottom plate, 511-fixing ring, 512-support column, 513-second slide rail, 52-sliding plate, 53-top pressure plate, 54-support block, 55-positioning block, 56-side baffle, 57-screw. DETAILED DESCRIPTION

[0050] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention 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 invention and to fully convey the scope of the present invention to those skilled in the art.

[0051] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0052] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0053] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0054] like Figure 1-13 As shown, a method for preparing a high-precision wax model with a lumen proposed by the present invention comprises the following steps:

[0055] Step 100: Core preparation

[0056] The core preparation includes preparing a core 1 according to the shape of the casting tube cavity, and the core 1 includes a plurality of tube bodies distributed at multiple angles.

[0057] In order to facilitate the fixation of the core 1 and the subsequent shell mold, the length of a part of the tube body is greater than the corresponding tube cavity length, so that the tube body can be exposed from the shell mold when the shell mold is prepared.

[0058] Step 200: wax model design

[0059] The casting wax mold is divided into a bottom wax mold 2, a rear wax mold 3 and a front wax mold 4, the bottom wax mold 2 is formed with a first pipeline groove 21, the rear wax mold 3 is formed with a second pipeline groove 31, and the front wax mold 4 is formed with a third pipeline groove 41;

[0060] Specifically, the tube body of the core 1 is divided into an X tube body 11, a Y tube body 12, and a Z tube body 13 according to the extension direction; the X tube body 11, the Y tube body 12, and the Z tube body 13 represent the three-dimensional directions of the coordinate axes X axis, Y axis, and Z axis where the tube body is located, and there is at least one of each X tube body, Y tube body, and Z tube body; a bottom wax mold 2 is separated at a corresponding position of the casting wax mold by taking a plane formed by the center lines of the X tube body 11 and the Y tube body 12 as a dividing plane; and a plane formed by the center lines of the X tube body 11 and a portion of the Z tube body 13 connected to the X tube body 11 as a dividing plane, and the remaining wax mold is separated into a rear wax mold 3 and a front wax mold 4 at a corresponding position of the casting wax mold.

[0061] 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.

[0062] The planes corresponding to the dividing surfaces in the bottom wax mold 2, the rear wax mold 3 and the front wax mold 4 are the splicing surfaces, and the multi-dimensional tube cavity forms grooves on the corresponding splicing surfaces. The diameter of the groove is reset as needed, and the diameter of the groove corresponding to the tube cavity port is made the same as the tube body diameter corresponding to the core 1 so as to form a precise fit with the core 1 during subsequent assembly. The diameter of the groove at other positions is larger than the tube body diameter so that the core 1 is suspended in the tube cavity during subsequent assembly, thereby forming the first pipeline groove 21, the second pipeline groove 31 and the third pipeline groove 41.

[0063] Specifically, when the wall thickness of the wax model corresponding to the suspended portion of the tube body is h≤3mm, the spacing between the suspended portion of the tube body and the groove walls of the first pipeline groove 21, the second pipeline groove 31, and the third pipeline groove 41 is l≤0.5mm. When the wall thickness of the wax model corresponding to the suspended portion of the tube body is 3mm≤h≤10mm, the spacing between the suspended portion of the tube body and the groove walls of the first pipeline groove 21, the second pipeline groove 31, and the third pipeline groove 41 is l≤1mm; when the wall thickness of the wax model corresponding to the suspended portion of the tube body is h>10mm, the spacing between the suspended portion of the tube body and the groove walls of the first pipeline groove 21, the second pipeline groove 31, and the third pipeline groove 41 is l≤2mm.

[0064] By making at least part of the tube body of the core 1 have the same inner diameter as the multi-angle tube cavity at the corresponding position for precise matching, at least part of the tube body and part of the area are suspended in the multi-angle tube cavity, thereby reducing the accuracy requirements for the casting wax mold of the multi-angle tube cavity, reducing the difficulty of assembling the casting wax mold and the core 1, thereby avoiding the problem that the core 1 cannot be assembled with the pipe groove in a certain dimension due to the multi-angle tube cavity.

[0065] In order to facilitate the positioning of the bottom wax mold 2, the rear wax mold 3 and the front wax mold 4, a first positioning protrusion 22 and a second positioning protrusion 23 are provided on the splicing surface of the bottom wax mold 2, a positioning hole adapted to the first positioning protrusion 22 is provided on the rear wax mold 3, and a positioning hole adapted to the second positioning protrusion 23 is provided on the front wax mold 4.

[0066] It should be noted that when designing the partition surface, the tube body connected to the most tube bodies in the core 1 can be the X tube body 11. Then, the Y tube body 12 and the Z tube body 13 are set according to the X tube body 11.

[0067] It should be noted that the X tube body 11 is not necessarily a single tube body, but may also be a plurality of continuous tube bodies. In this embodiment, the X tube body 11 includes an X1 tube body and an X2 tube body connected to each other, and the X1 tube body and the X2 tube body are arranged at an obtuse angle. The Y tube body 12 includes a Y1 tube body connected to the X1 tube body and a Y2 tube body connected to the X2 tube body, and the Z tube body 13 includes a Z1 tube body 14 connected to the X1 tube body and the Y1 tube body, and a Z2 tube body 15 connected to the X2 tube body and the Y2 tube body.

[0068] It should be noted that the X tube body 11, the Y tube body 12, and the Z tube body 13 in the present invention are not necessarily perpendicular to each other, that is, the X tube body 11, the Y tube body 12, and the Z tube body 13 can be perpendicular to each other, or can be arranged at an angle of 0-90 degrees. For example, the Z tube body 13 also includes a Z4 tube body 17 connected to the connection position of the X1 tube body and the X2 tube body, and correspondingly, the bottom wax mold 2 and the rear wax mold 3 are also provided with corresponding limit grooves.

[0069] It should be noted that the Y tube body 12 and the Z tube body 13 in the present invention are not necessarily connected to the X tube body 11. For example, the Z tube body 13 also includes a Z3 tube body 16 connected to the Y tube body 12, and the rear wax mold 3 is also provided with a sleeve cavity 32 for sleeve-connecting the Z3 tube body 16; a partial area of ​​the Z3 tube body 16 has the same inner diameter as the sleeve cavity 32 at the corresponding position for precise matching, and the Z3 tube body 16 and a partial area thereof are suspended in the sleeve cavity 32.

[0070] It should be noted that the length of the tube body in the partial area of ​​the tube body used for precise matching with the multi-angle lumen is ≥8mm.

[0071] It should be noted that the tube body includes a connecting end for connecting to each other and a free end relative to the connecting end. In the present method, a partial area of ​​the tube body for precise matching with the multi-angle lumen is arranged adjacent to the free end; in other embodiments, a partial area of ​​the tube body for precise matching with the multi-angle lumen may also be arranged adjacent to the connecting end.

[0072] It should be noted that, since the X tube body 11, Y tube body 12, and Z tube body 13 of the core are in different planes, when the bottom wax mold 2, the front wax mold 4, the back wax mold 3 and the core 1 are spliced, there will inevitably be assembly interference. For example, after the X tube body 11 and the Y12 tube body are assembled with the bottom wax mold 2, due to the shrinkage and deformation of the wax mold, the front wax mold 4 and the back wax mold 3 cannot be assembled with the X tube body 11 and the Y tube body 12 at the same time as the Z tube body 13 in multiple directions. At this time, the spacing between the suspended part of the tube body and the cavity wall of the multi-angle tube cavity can be used as a space for adjusting interference.

[0073] Step 300: Preparation of wax molds

[0074] The wax mold is prepared according to the designed bottom wax mold 2, rear wax mold 3 and front wax mold 4, wherein the bottom wax mold 2, rear wax mold 3 and front wax mold 4 can be prepared by 3D printing; the outline of the basic wax mold prepared by 3D printing meets the design requirements, and the interior is a hollow structure to reduce the overall weight of the 3D printed wax mold;

[0075] The bottom wax mold 2, the rear wax mold 3 and the front wax mold 4 are cleaned and partially repaired on the surface.

[0076] Step 400: Assembling wax models

[0077] The core 1 is spliced ​​with the bottom wax mold 2, the rear wax mold 3, and the front wax mold 4 by using a splicing tool 5, and the core 1 is placed in a multi-angle tube cavity formed by the first pipeline groove 21, the second pipeline groove 31, and the third pipeline groove 41 to obtain an integral wax mold with a multi-angle tube cavity; and at least part of the area of ​​the tube body of the core 1 is the same as the inner diameter of the multi-angle tube cavity at the corresponding position for precise matching, and the remaining area of ​​the core 1 is suspended in the multi-angle tube cavity.

[0078] Specifically, the splicing tool 5 includes a bottom plate 51 having a fixing ring 511 , a sliding plate 52 slidably connected to the bottom plate 51 , and a top pressure plate 53 arranged corresponding to the fixing ring 511 .

[0079] Using the splicing tool 5 to splice the core 1 with the bottom wax mold 2, the rear wax mold 3 and the front wax mold 4 includes the following steps in sequence:

[0080] Fixing the rear wax model 3: The rear wax model 3 is mounted on the fixing ring 511 of the bottom plate 51; wherein the shape of the fixing ring 511 matches the shape of the center hole of the rear wax model 3, so that the rear wax model 3 can be placed on the bottom plate 51 with the joint surface facing upward. At this time, the X and Y directions of the rear wax model 3 are fixed due to the fit with the fixing ring 511, and the Z direction is further limited by the support column 512, so as to ensure that the rear wax model 3 is accurately positioned in the three directions of X, Y and Z.

[0081] Fixing the core 1: The Z3 tube body 16 of the core 1 is sleeved into the through-tube cavity 32 of the rear wax mold 3, and then the X tube body 11, the Y tube body 12 and the Z tube body 13 are placed in the second pipeline groove 31 of the rear wax mold 3, and the Z4 tube body 17 is located in the limiting groove of the rear wax mold 3. Through the through-tube cavity 32, the front wax mold 4 and the rear wax mold 3 are fixed as a whole, and 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. Combined with the placement of the X tube body 11, the Y tube body 12 and the Z tube body 13, the core 1 is positioned and connected with the rear wax mold 3 in the three directions of X, Y and Z.

[0082] Fixing the front wax model 4: The front wax model 4 is mounted on the rear wax model 3, and part of the third pipe groove 41 and part of the second pipe groove 31 enclose a tube cavity that sleeves part of the Z tube body 13; therefore, the front wax model 4 and the rear wax model 3 are positioned in the X and Y directions, and the front wax model 4 cannot move in the X and Y directions, ensuring accurate assembly in the X and Y directions. At the same time, the Z direction of the spliced ​​rear wax model 3 and the front wax model 4 is limited by the support column 512, so that the spliced ​​rear wax model 3 and the front wax model 4 are accurately positioned in the three directions of XYZ.

[0083] The bottom wax mold 2 is fixed: the bottom wax mold 2 is placed on the sliding plate 52, and the sliding plate 52 is pushed to splice the bottom wax mold 2 with the rear wax mold 3 and the front wax mold 4, and the first pipeline groove 21 and part of the third pipeline groove 41 and part of the second pipeline groove 31 are enclosed to form a tube cavity for sleeve-connecting the X tube body 11 and the Z tube body 13, and the Z4 tube body 17 is located in the limiting groove of the bottom wax mold 2. Specifically, the bottom plate 51 is provided with a second slide rail 513 and a slider slidably connected to the second slide rail 513, and the sliding plate 52 is connected to the slider to slide relatively on the bottom plate 51; the bottom wax mold 2 is fixed at a preset angle by a positioning block 55, a support block 54 and a side baffle 56 provided on the sliding plate 52. Since the bottom wax mold 2 is fixed at a preset angle after positioning, it can ensure accurate positioning with the rear wax mold 3 and the front wax mold 4 during the splicing process, and it is easier to assemble with the rear wax mold 3 and the front wax mold 4 through the sliding device on the sliding plate 52.

[0084] During splicing, the first positioning protrusion 22 and the second positioning protrusion 23 on the bottom wax mold 2 are respectively adapted and positioned with the positioning holes at the corresponding positions of the front wax mold 4 and the rear wax mold 3 to further ensure the assembly accuracy.

[0085] Fixing of the top pressure plate 53: After the bottom wax mold 2 and the front wax mold 4 and the rear wax mold 3 are spliced ​​into a whole, the top pressure plate 53 is installed on the front wax mold 4 and the bottom wax mold 2, and connected to the fixing ring 511 through the screw 57. Specifically, the fixing ring 511 is provided with a threaded hole, the top pressure plate 53 is provided with a through hole, and a screw 57 is inserted in the through hole of the top pressure plate 53, and the screw 57 passes through the center holes of the rear wax mold 3 and the front wax mold 4 in turn to connect with the threaded hole on the fixing ring 511, and the top pressure plate 53 and the fixing ring 511 are locked above the through hole of the top pressure plate 53 by using a nut, so as to realize the close splicing of the bottom wax mold 2 and the front wax mold 4 and the rear wax mold 3. At this time, further through the joint action of the top pressure plate 53 and the support column 512, the accurate positioning of the spliced ​​bottom wax mold 2 and the front wax mold 4 and the rear wax mold 3 in the three directions of XYZ is realized.

[0086] Envelope fixing: An elastic envelope is sleeved on the outside of the tubular splicing structure formed by the first pipeline groove 21, the second pipeline groove 31 and / or the third pipeline groove 41; the envelope is made of elastic material and can tightly fix at least two wax mold blocks and the core 1.

[0087] Melting and fixing: melt at least part of the joints between the bottom wax mold 2, the rear wax mold 3, and the front wax mold 4 to fuse them together. Specifically, the joints can be melted by an electric soldering iron to achieve melting and fusion connection of the wax mold, the rear wax mold 3, and the front wax mold 4.

[0088] It should be noted that the splicing tool 5 also includes a plurality of support columns 512, which are arranged on the outer periphery of the fixing ring 511, and the support columns 512 are used to support the second pipe groove 31 of the rear wax mold 3. In this embodiment, the number of the support columns 512 is 4, and the 4 support columns 512 are respectively arranged corresponding to the pipe ends of the X1 pipe body, the X2 pipe body, the Y1 pipe body, and the Y2 pipe body.

[0089] The second aspect of the present invention also provides a wax mold, which is mainly prepared by the above wax mold preparation method. Since the wax mold in this embodiment and the above preparation method are in the same technical concept, the wax mold in this embodiment also has the beneficial effects of the above preparation method.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a high-precision wax model with a lumen, characterized in that: The following steps are included in sequence: Core preparation, wax pattern design, block wax pattern preparation and block wax pattern assembly; The core preparation includes preparing the core according to the shape of the casting tube cavity, and the core includes a plurality of tube bodies distributed at multiple angles; The wax mold design includes separating the casting wax mold into a bottom wax mold, a rear wax mold and a front wax mold, wherein the bottom wax mold is formed with a first pipeline groove, the rear wax mold is formed with a second pipeline groove, and the front wax mold is formed with a third pipeline groove; The block wax model assembly includes using a splicing tool to splice the core with the bottom wax model, the rear wax model, and the front wax model, and placing the core in a multi-angle tube cavity formed by the first pipeline groove, the second pipeline groove, and the third pipeline groove to obtain an integral wax model with a multi-angle tube cavity; Among them, at least a part of the tube body of the core has the same inner diameter as the multi-angle tube cavity at the corresponding position for precise matching, and the rest of the core is suspended in the multi-angle tube cavity.

2. The method for preparing a high-precision wax model with a lumen according to claim 1, characterized in that: Separating the wax mold into a bottom wax mold, a rear wax mold and a front wax mold comprises: The tube body of the core is divided into an X tube body, a Y tube body, and a Z tube body according to the extension direction; The bottom wax mold is separated at the corresponding position of the casting wax mold by taking the plane formed by the center lines of the X tube body and the Y tube body as the dividing plane; the remaining wax mold is separated into the rear wax mold and the front wax mold at the corresponding position of the casting wax mold by taking 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 as the dividing plane.

3. The method for preparing a high-precision wax model with a lumen according to claim 2, characterized in that: The splicing tooling comprises a bottom plate with a fixing ring, a sliding plate slidably connected to the bottom plate, and a top pressure plate arranged corresponding to the fixing ring; Using a splicing tool to splice the core with the bottom wax mold, the rear wax mold and the front wax mold comprises the following steps in sequence: Fixing the rear wax model: installing the rear wax model on the fixing ring of the base plate accordingly; Core fixing: placing the X tube body, Y tube body and Z tube body of the core in the second core groove of the rear wax mold; Fixing the front wax mold: installing the front wax mold on the rear wax mold, and enclosing part of the third core groove and part of the second core groove to form a tube cavity that sleeves part of the Z tube body; Fixing the bottom wax mold: placing the bottom wax mold on the sliding plate, and pushing the sliding plate to splice the bottom wax mold with the rear wax mold and the front wax mold, and making the first pipeline groove, part of the third core groove and part of the second core groove enclose to form a tube cavity sleeved with the X tube body and the Z tube body; Fixing of top pressure plate: Install the top pressure plate on the front wax mold and the bottom wax mold, connect it with the fixing ring through the screw rod, and fix it with the nut; Melting and fixing: melting at least part of the joints between the bottom wax model, the rear wax model and the front wax model so as to fuse them together.

4. The method for preparing a high-precision wax model with a lumen according to claim 3, characterized in that: The Z tube body also includes a Z3 tube body connected to the Y tube body, and the rear wax mold is also provided with a sleeve cavity for sleeve-fitting the Z3 tube body; a partial area of ​​the Z3 tube body has the same inner diameter as the sleeve cavity at the corresponding position for precise matching, and a partial area of ​​the Z3 tube body is suspended in the sleeve cavity.

5. The method for preparing a high-precision wax model with a lumen according to claim 3, characterized in that: Splicing the core with the base wax mold, the rear wax mold and the front wax mold using a splicing tool also includes a sleeve fixing step located between the base wax mold fixing step and the melting fixing step, and the sleeve fixing step includes using an elastic sleeve to be sleeved on the outside of the tubular splicing structure formed by the first pipe groove, the second pipe groove and / or the third pipe groove.

6. The method for preparing a high-precision wax model with a lumen according to claim 3, characterized in that: The splicing tool also includes a plurality of support columns, which are arranged on the outer periphery of the fixing ring and are used to support the second pipeline groove of the rear wax model.

7. The method for preparing a high-precision wax model with a lumen according to claim 3, characterized in that: The sliding plate is provided with a positioning block, a supporting block and a side baffle, and the bottom wax mold is arranged on the sliding plate through the positioning block, the supporting block and the side baffle.

8. The method for preparing a high-precision wax model with a lumen according to claim 3, characterized in that: The fixing ring is provided with a screw hole, the top pressure plate is provided with a bolt, the bolt passes through the center holes of the front and rear membranes and the rear wax mold and is connected to the screw hole with a bolt, and the top pressure plate is fixed with a nut on the bolt, and the front and rear membranes and the rear wax mold are fixed; And / or the base wax mold is provided with a first positioning protrusion and a second positioning protrusion, and the base wax mold fixing step includes fitting and positioning the first positioning protrusion with the rear wax mold, and fitting and positioning the second positioning protrusion with the front wax mold.

9. The method for preparing a high-precision wax model with a lumen according to claim 3, characterized in that: At least a portion of the tube body of the core passes through the multi-angle tube cavity and is exposed outside the integral wax mold.

10. A high-precision wax mold with a tubular cavity, characterized in that: The preparation method is described in any one of claims 1 to 9.

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