Soluble core preparation apparatus and method

Abstract

The application discloses a soluble core preparation device and a preparation method. The soluble core preparation device comprises an inner core mold, an outer mold which is arranged in a circumferential ring outside the outer periphery of the inner core mold, a support mold base which is arranged at the bottom and is used for positioning and mounting the outer mold, and a wax injection mold cover which is arranged on the outer mold and is used for jointly pressing the inner core mold and the outer mold on the support mold base. A preparation cavity for preparing the soluble core is formed between the inner core mold and the outer mold. The inner core mold is used for being engaged with the soluble core to form an integrated structure. The outer wall of the inner core mold is provided with a limiting boss which is shaped according to the outer wall of the soluble core, so that the thickness of the soluble core at different positions is controlled within a preset range. The soluble core preparation device can make the soluble core and the inner core mold form an integrated structure, guarantees the strength of the soluble core, reduces the radial thickness of the soluble core, and can solve the problems of cracking and shrinkage hole of the soluble core. The soluble core prepared by the soluble core preparation method can be applied to the production of wax parts, and can greatly improve the quality and the qualified rate of the wax parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precision casting, in particular, to a soluble core preparation device. Furthermore, the present application also relates to a soluble core preparation method using the soluble core preparation device. BACKGROUND

[0002] Precision casting refers to a general term of processes for obtaining precision-sized castings. Among common casting processes, precision casting is the most precise and difficult process, including investment casting, ceramic mold casting, metal mold casting, pressure casting, and lost foam casting. Precision casting, also known as lost wax casting, is a process of injecting a medium-temperature wax into a wax part mold, taking out the wax part mold after cooling to obtain a shaped wax part. When pressing a wax part with a complex internal cavity structure, the wax part mold cannot be cored, and a soluble core needs to be placed in the wax part mold for shaping. After the wax part is pressed, the wax part and the soluble core are taken out from the wax part mold at the same time, and the soluble core is melted to obtain a finished wax part.

[0003] The soluble core usually has the structural characteristics of interface mutation, deep grooves and narrow slots, and uneven thickness, to adapt to the complex internal cavity of the wax part. At present, for the preparation of the soluble core, a slurry at about 80℃ is pressed into a soluble core mold with a steel core, and then the shaped soluble core is taken out from the soluble core mold for cooling. However, the steel core in the soluble core mold in the prior art has a cylindrical structure, resulting in a large wall thickness difference between the steel core and the outer wall of the soluble core, and a large amount of slurry needs to be filled. Moreover, the soluble core mold is usually placed in a mold room at about 20℃ all year round, and its normal temperature is the same as the temperature of the mold room. When the slurry at about 80℃ is injected into the soluble core mold for the preparation of the soluble core, a temperature gradient from outside to inside will be generated after the slurry contacts the surface of the soluble core mold. The large temperature difference between the inside and the outside will cause the soluble core to crack due to uneven shrinkage from the inside to the outside. Moreover, when the shaped soluble core is taken out and placed in the mold room for cooling, the large temperature difference between the inside and the outside will cause a large difference in cooling speed between the inside and the outside, resulting in different shrinkage sequences and shrinkage amounts between the inside and the outside of the soluble core, and causing shrinkage holes and internal shrinkage. The soluble core mold in the prior art has only one wax injection hole, resulting in a long path of the slurry during filling, a large temperature loss, the lowest slurry temperature and the worst slurry viscosity at the end, and the most serious cracking at the farthest end of the soluble core from the wax injection hole.

[0004] In addition, due to the problems of shrinkage holes and internal shrinkage of the soluble core, the surface strength of the soluble core is poor, and when the soluble core is placed in the wax part mold for wax part casting, the surface of the wax part will be damaged to produce wax tumors. Moreover, the soluble core cannot be positioned in the wax part mold, resulting in that the shape, precision and quality of the wax part are difficult to meet the use requirements, and the scrap rate is high. SUMMARY

[0005] The application provides a soluble core preparation device and a preparation method to solve the technical problem of cracks and shrinkage holes in the preparation of soluble cores in the prior art, which leads to poor quality of the wax mold and low pass rate.

[0006] According to one aspect of the application, a soluble core preparation device is provided, which comprises an inner core mold, an outer mold arranged circumferentially around the outer periphery of the inner core mold, a support mold base arranged at the bottom and used for positioning and mounting the outer mold, and a wax injection mold cover arranged on the outer mold and used for pressing the inner core mold and the outer mold together on the support mold base, a preparation cavity for preparing the soluble core is formed between the inner core mold and the outer mold, and the inner core mold is used to be integrated with the soluble core.

[0007] The outer wall of the inner core mold is provided with a limiting boss which is profiled with the outer wall of the soluble core, so that the thickness of the soluble core at different positions is controlled within a preset range.

[0008] Further, a correction ring is arranged in the preparation cavity, and the correction ring is attached to the inner wall of the outer mold.

[0009] The inner wall of the correction ring is provided with a second positioning groove and / or a second positioning block, which is used for clamping the soluble core and connecting the soluble core as an integral structure.

[0010] Further, the wax injection mold cover comprises a locking module used for locking the outer wall of the outer mold and a wax injection adapter block mounted on the upper end of the locking module, a wax injection cavity is formed between the locking module and the wax injection adapter block, a plurality of wax injection holes are arranged circumferentially in the locking module, and the wax injection holes are used for connecting the preparation cavity and the wax injection cavity.

[0011] Further, the inner core mold is a hollow structure, and the outer wall of the limiting boss is provided with a first positioning groove and / or a first positioning block used for clamping the soluble core.

[0012] The first positioning groove and / or the first positioning block are arranged in multiple along the axial direction of the inner core mold.

[0013] Further, the outer mold comprises a lower forming module and an upper forming module which are positioned and mounted on the support mold base and used for forming the outer mold surface of the soluble core, the lower forming module is sleeved on the outer periphery of the correction ring, and a plurality of upper forming modules are arranged circumferentially along the outer periphery of the lower forming module, and the plurality of upper forming modules are clamped and locked circumferentially.

[0014] The support mold base is provided with an ejection structure used for separating the plurality of upper forming modules from the formed soluble core.

[0015] Further, the locking module comprises a pressing plate arranged on the upper forming module and a locking ring fixed to the pressing plate, the locking ring is arranged circumferentially around the outer periphery of the upper forming module, and is used for radially locking the upper forming module.

[0016] The outer wall of the upper forming module is provided with a first taper surface structure gradually increasing in diameter towards the direction of supporting the mold base, and the inner wall of the locking ring is provided with a second taper surface structure matched with the first taper surface structure.

[0017] Further, the pressing plate and the support mold base are both provided with positioning grooves for clamping the axial two ends of the inner core mold to position and install the inner core mold.

[0018] Further, the side wall of the wax injection adapter block is provided with a wax injection opening, the wax injection opening and the wax injection cavity are communicated through a wax injection pipe arranged in the wax injection adapter block.

[0019] Further, the wall surface of the support mold base, the pressing plate, the upper forming module and the lower forming module towards the preparation cavity is sprayed with a mold release agent.

[0020] According to another aspect of the present application, a mold pressing method using the soluble core preparation device is also provided, and the steps are as follows:

[0021] S1, installing the soluble core preparation device: positioning and installing the outer mold on the support mold base, then placing the correction ring on the support mold base and fitting it to the inner wall of the outer mold, installing the inner core mold in the inner cavity of the outer mold to form a preparation cavity between the outer mold and the inner core mold, and finally locking the wax injection mold cover to the outer periphery of the outer mold to press the inner core mold and the outer mold;

[0022] S2, then placing the installed soluble core preparation device on the heater for preheating, so as to heat it to a preset temperature;

[0023] S3, injecting wax material into the wax injection cavity through the wax injection mold cover, so that the wax material is uniformly injected into the preparation cavity through the plurality of wax injection holes in the wax injection cavity to form a soluble core, and the formed soluble core and the correction ring and the inner core mold form an integrated soluble core assembly;

[0024] S4, sequentially disassembling the wax injection mold cover and the outer mold to take out the formed soluble core assembly, and placing the taken-out soluble core assembly in the temperature controller for slow cooling, thus completing the preparation of the soluble core.

[0025] The present application has the following advantages:

[0026] 1. The soluble core preparation device of the present application, by setting the limiting boss of the inner core mold to the structure of the outer wall of the soluble core, compared with the cylindrical inner core mold used in the prior art, the radial thickness of each part of the soluble core is consistent, effectively reducing the wall thickness difference of the soluble core, thereby reducing the temperature difference between the inner wall and the outer wall of the soluble core, keeping the shrinkage degree between the inner and outer walls of the soluble core consistent, effectively preventing the soluble core from appearing shrinkage hole problem, at the same time, the inner core mold is formed into an integral structure with the soluble core through the limiting boss, improving the strength of the soluble core, and the inner wall of the soluble core is reliably supported by the outer wall of the inner core mold, avoiding the problem of collapse;

[0027] 2. By setting the limiting boss of the inner core mold towards the direction of the preparation cavity, the space of the preparation cavity can be reduced to reduce the wall thickness of the prepared soluble core, so that the shrinkage space of the soluble core is smaller, avoiding cracks caused by shrinkage of the soluble core, improving the surface quality, and at the same time, the reduction of the space of the preparation cavity also reduces the filling of the wax material, saving materials and reducing production cost;

[0028] 3. The soluble core preparation method of the present application preheats the soluble core preparation device, and slowly cools the integral structure formed by the prepared soluble core, the inner core mold and the correction ring as a whole after taking out, so as to reduce the temperature difference with the environment, greatly improving the crack, shrinkage hole and collapse problems of the soluble core, and the soluble core prepared by the method is applied to the production of wax parts, so that the pressed wax parts have good stability and high quality, greatly improving the qualified rate of the pressed wax parts.

[0029] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings constituting a part of the present application are used to provide a further understanding of the present application, the schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0031] Figure 1 is a structure schematic view of the soluble core preparation device of the preferred embodiment of the present application;

[0032] Figure 2 is a sectional view A-A of the soluble core preparation device of the preferred embodiment of the present application;

[0033] Figure 3 is a sectional view B-B of the soluble core preparation device of the preferred embodiment of the present application;

[0034] Figure 4 is a structure schematic view of the soluble core assembly of the preferred embodiment of the present application;

[0035] Figure 5 is a sectional view of a soluble core assembly of a preferred embodiment of the present application;

[0036] Figure 6 is a structural schematic view of a wax injection mold cover of a preferred embodiment of the present application.

[0037] Legend:

[0038] 100, inner core mold; 101, first positioning groove; 200, outer mold; 201, lower molding module; 202, upper molding module; 300, support mold base; 400, wax injection mold cover; 401, locking module; 4011, pressing plate; 4012, locking ring; 4013, wax injection hole; 402, wax injection adapter block; 4021, wax injection port; 4022, wax injection tube; 500, wax injection cavity; 600, preparation cavity; 700, correction ring; 701, second positioning groove; 800, soluble core. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0040] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 5 , the soluble core preparation device of the present embodiment includes an inner core mold 100, an outer mold 200 circumferentially and annularly arranged outside the outer periphery of the inner core mold 100, a support mold base 300 arranged at the bottom for positioning the outer mold 200, and a wax injection mold cover 400 arranged at the upper end of the outer mold 200 and used for pressing the outer mold 200 and the inner core mold 100 together on the support mold base 300. The outer mold 200 is annularly arranged on the support mold base 300 for forming the outer wall of the soluble core 800. The inner core mold 100 is coaxially arranged with the outer mold 200 for forming the inner wall of the soluble core 800 and is engaged with the inner wall of the soluble core 800 to form an integral structure. The inner core mold 100 and the outer mold 200 form a preparation cavity 600 for preparing the soluble core 800. The outer wall of the inner core mold 100 is provided with a limiting boss shaped like the outer wall of the soluble core 800, so that the thickness of the soluble core 800 at different positions is controlled within a predetermined range.

[0041] Preferably, the inner core die 100 is a profiled steel core, and the limiting boss of the inner core die 100 is arranged in a profiled structure with the outer wall of the soluble core 800. Compared with the cylindrical steel core used in the prior art, the radial thickness of each part of the soluble core 800 is consistent, effectively reducing the wall thickness difference of the soluble core 800, thereby reducing the temperature difference between the inner wall and the outer wall of the soluble core 800, keeping the shrinkage degree between the inner wall and the outer wall of the soluble core 800 consistent, effectively preventing the soluble core 800 from appearing shrinkage hole problems, and preferably, the wall thickness difference of the soluble core 800 can be controlled within 3mm-8mm. At the same time, the steel inner core die 100 is clamped with the soluble core 800 through the limiting boss to form an integrated structure, which improves the strength of the soluble core 800, and the inner wall of the soluble core 800 is reliably supported by the outer wall of the inner core die 100, avoiding the problem of collapse. In addition, the limiting boss of the inner core die 100 is arranged towards the preparation cavity 600, which can reduce the space of the preparation cavity 600 to reduce the wall thickness of the prepared soluble core 800, make the shrinkage space of the soluble core 800 smaller, avoid cracks caused by shrinkage of the soluble core 800, improve the surface quality, and at the same time, the reduction of the space of the preparation cavity 600 also reduces the filling of the wax material, saves materials, and reduces production costs.

[0042] As shown in Figure 2 , Figure 3 and Figure 5 , the preparation cavity 600 is provided with a correction ring 700, which is installed in close contact with the inner wall of the outer mold 200, and is used to clamp the soluble core 800 and connect the outer wall of the soluble core 800 into an integrated structure. Specifically, the correction ring 700 is in a ring structure and is integrally formed, which is arranged on the support die seat 300 at the bottom of the preparation cavity 600 and is installed in close contact with the inner wall of the lower forming die 201, and is used to clamp the outer wall of the lower end of the soluble core 800 in the preparation cavity 600 and form an integrated structure with the soluble core 800. The lower end of the soluble core 800 is more prone to shrinkage due to cooling, which can cause fluctuations in the critical dimensions. By clamping the correction ring 700 at the lower end of the soluble core 800, the deformation of the soluble core 800 can be prevented, effectively preventing the soluble core 800 from cracking, solving the problem of fluctuations in the critical dimensions of the soluble core 800 caused by cooling shrinkage, and improving the quality of the outer surface of the soluble core 800. In addition, when using the soluble core 800 with the correction ring 700 to press the wax part, the forming quality of the inner wall of the wax part can be improved, and after the wax part is formed and the soluble core 800 is melted and demolded, the correction ring 700 can be directly integrated with the inner wall of the wax part to strengthen the support of the inner wall of the wax part, ensure the size of the wax part, effectively control the radial size of the wax part, and avoid the situation that the wax part cannot be put into the inner cavity of the wax part due to the opening size of the wax part being smaller than the correction ring 700. Preferably, the correction ring 700 is a steel ring with certain rigidity and smooth surface.

[0043] AsFigure 2 and Figure 5 As shown, the inner wall of the correction ring 700 is radially provided with a second positioning groove 701 and / or a second positioning block for engaging with the soluble core 800, to prevent the correction ring 700 from detaching from the soluble core 800, ensuring a stable and reliable connection with the soluble core 800, and enabling the correction ring 700 to form a stable integral structure with the soluble core 800. Optionally, multiple second positioning grooves 701 or second positioning blocks are provided along the axial direction of the correction ring 700 to further enhance the bonding force between the correction ring 700 and the soluble core 800, and improve the stability of the prepared soluble core 800. Optionally, the second positioning groove can adopt a ring structure, a spiral structure, or a straight structure, etc., and the second positioning block can be a protruding structure.

[0044] like Figure 2 , Figure 3 and Figure 5 As shown, the wax injection mold cover 400 is locked to the outside of the outer mold 200 and presses the inner core mold 100 onto the support mold base 300, for inputting wax material into the preparation cavity 600. The wax injection mold cover 400 includes a locking module 401 and a wax injection adapter block 402 installed on the upper end of the locking module 401. A wax injection cavity 500 is formed between the locking module 401 and the wax injection adapter block 402. A plurality of wax injection holes 4013 are radially opened in the locking module 401 for connecting the preparation cavity 600 and the wax injection cavity 500. Preferably, multiple wax injection holes 4013 are evenly distributed radially on the locking module 401. Compared with the single wax injection hole 4013 on one side in the prior art, the filling path and time of wax entering the preparation cavity 600 can be shortened, thereby reducing the temperature loss of wax and reducing the temperature difference between the front end and the bottom of the preparation cavity 600 during the filling process, effectively reducing the generation of cracks, cold shuts and shrinkage cavities in the soluble core 800.

[0045] like Figure 2 and Figure 3 As shown, the inner core mold 100 has a hollow structure to ensure its rigidity while reducing its weight, facilitating its transfer and use. A first positioning groove 101 is radially formed on the outer wall of the limiting boss on the inner core mold 100. This allows the inner core mold 100 to engage with the soluble core 800 through the first positioning groove 101, enhancing the bonding force between them. This prevents the soluble core 800 from shrinking or slipping under the axial and radial limiting action of the first positioning groove 101, avoiding cracks and effectively improving the molding quality of the soluble core 800. Preferably, multiple first positioning grooves 101 are provided along the axial direction of the inner core mold 100 to further enhance the bonding force between the inner core mold 100 and the soluble core 800. Optionally, the first positioning grooves 101 can also be provided along the axial direction of the inner core mold 100. Optionally, the first positioning groove can adopt a ring structure, a spiral structure, or a straight structure, and the first positioning block can be a protruding structure.

[0046] Preferably, the inner cavity of the inner core mold 100 is provided with a crossbar, which is arranged at one end of the inner core mold 100 close to the wax injection mold cover 400 and is fixedly installed on the inner wall of the inner core mold 100 in a horizontal direction, so as to facilitate the pulling of the inner mold, and thus the integrally structured body of the formed soluble core 800, the inner core mold 100 and the correction ring 700 can be pulled out of the mold through the crossbar, and the integrally structured body is conveniently placed in the wax part mold for forming the wax part cavity, which is convenient for operation.

[0047] As shown in Figure 2 , Figure 3 and Figure 4 , since the lower end of the outer mold surface of the to-be-prepared soluble core 800 has a groove structure arranged towards the inner wall thereof, the groove structure is not convenient for processing and molding the formed soluble core 800 to be taken out, and thus the outer mold 200 is provided in a split structure. Specifically, the outer mold 200 includes a lower molding module 201 for molding the lower end of the outer mold surface of the soluble core 800 and an upper molding module 202 for molding the sidewall of the outer mold surface of the soluble core 800, the lower molding module 201 is in a ring structure and is integrally formed, is sleeved on the outer periphery of the correction ring 700 and is positioned and installed on the support mold base 300 through a positioning pin, the integrally formed lower molding module 201 has good overall stability, can provide good support for the lower end of the soluble core 800, and is convenient for taking out the formed soluble core 800 from above the lower molding module 201; a plurality of upper molding modules 202 are arranged along the outer periphery of the lower molding module 201, the plurality of upper molding modules 202 are locked together in the circumferential direction, the upper ends of the plurality of upper molding modules 202 are radially locked by the locking module 401, and the lower ends of the plurality of upper molding modules 202 are installed on the support mold base 300 through positioning pins, so that the plurality of upper molding modules 202 are detachably positioned and installed between the wax injection mold cover 400 and the support mold base 300 as movable blocks.

[0048] The support mold base 300 is provided with a demolding structure for demolding the plurality of upper molding modules 202 from the formed soluble core 800 in blocks, the demolding structure includes a guide rail formed in the support mold base 300, and the bottom of the upper molding module 202 is movably installed in the guide rail and is positioned on the support mold base 300 through a positioning pin. Thus, when demolding the upper molding module 202, the locking module 401 is first removed from the upper end of the upper molding module 202, then the positioning pin on the upper molding module 202 is removed to release the positioning between the upper molding module 202 and the support mold base 300, and then the upper molding module 202 is controlled to slide in the guide rail, so that the plurality of upper molding modules 202 are radially separated from the outer wall of the formed soluble core 800 to complete the demolding.

[0049] As shown in Figure 2As shown, the locking module 401 comprises a pressing plate 4011 and a locking ring 4012. The pressing plate 4011 is arranged on the upper end of the upper forming module 202 to press the upper forming module 202 and axially limit the upper forming module 202. The locking ring 4012 is fixed to one end of the pressing plate 4011 facing the upper forming module 202 and is integrally formed with the pressing plate 4011. The locking ring 4012 is arranged on the outer periphery of the upper forming module 202 to radially lock the upper forming module 202. Thus, the locking module 401 can press and fix the upper forming module 202 on the support die holder 300 through the cooperation of the pressing plate 4011 and the locking ring 4012, thereby ensuring the stability and reliability of the structure. The outer wall of the upper forming module 202 is provided with a first conical surface structure with gradually increasing diameter towards the support die holder 300. The inner wall of the locking ring 4012 is provided with a second conical surface structure matched with the first conical surface structure, so as to increase the contact area between the upper forming module 202 and the locking ring 4012, and make the upper forming module 202 be pressed by the locking ring 4012 with greater force, thereby enhancing the locking force of the upper forming module 202.

[0050] As shown in Figure 2 The pressing plate 4011 and the support die holder 300 are provided with positioning grooves corresponding to the axial direction. The two positioning grooves are respectively sealed and connected with the two ends of the inner core die 100, so as to press and fix the inner core die 100 between the pressing plate 4011 and the support die holder 300 and position the inner core die 100 at the central axis of the preparation cavity 600. Thus, during the process of injecting wax into the preparation cavity 600, the position of the inner core die 100 in the preparation cavity 600 can be prevented from being deviated due to the filling pressure of the wax, thereby ensuring the stability and reliability of the position of the inner core die 100 in the preparation cavity 600.

[0051] Preferably, the support die holder 300 is provided with a weight reduction hole coaxially arranged with the positioning groove and connected with the inner core die 100. On the one hand, the weight reduction hole can reduce the weight of the support die holder 300 and reduce the processing and transfer difficulty. On the other hand, the filling process of injecting wax into the preparation cavity 600 can form a high-temperature and high-pressure environment in the preparation cavity 600. The cooperation gap between the weight reduction hole and the inner core die 100 can reduce the filling pressure of the wax in the preparation cavity 600 and make the wax in the preparation cavity 600 be uniformly distributed, thereby improving the forming quality of the soluble core 800.

[0052] As shown in Figure 2 and Figure 6As shown, the wax injection adapter 402 is arranged above the pressing plate 4011 and fixedly connected with the pressing plate 4011, and a wax injection cavity 500 is formed between the wax injection adapter 402 and the pressing plate 4011. A plurality of wax injection holes 4013 are arranged on the pressing plate 4011 and spaced apart along the radial direction of the pressing plate 4011, and the wax injection holes 4013 are used to communicate the wax injection cavity 500 and the preparation cavity 600. A wax injection port 4021 is arranged on the side wall of the wax injection adapter 402, and the wax injection port 4021 is communicated with the wax injection cavity 500 through a wax injection pipe 4022 arranged in the wax injection adapter 402. In use, the wax injection machine is started to inject liquid wax into the wax injection cavity 500 through the wax injection port 4021. The wax is quickly filled into the wax injection cavity 500 under the pressure of the wax injection machine, so that the wax in the wax injection cavity 500 can be simultaneously injected into the preparation cavity 600 through the plurality of wax injection holes 4013 to prepare the soluble core 800. Compared with the prior art in which a single wax injection hole 4013 is arranged on one side, the structure can uniformly distribute the wax, shorten the filling path and time of the wax into the preparation cavity 600, reduce the temperature loss of the wax, reduce the temperature difference of the wax at the front end and the bottom of the preparation cavity 600 during the filling process, and effectively reduce the generation of cracks, cold shuts and shrinkage holes of the soluble core 800.

[0053] When the soluble core 800 in the preparation cavity 600 is formed and needs to be demolded, first, the pressing plate 4011 of the wax injection mold cover 400 is detached from the upper forming module 202 to release the locking of the upper end of the upper forming module 202, and then the positioning pin at the bottom of the upper forming module 202 is removed to release the positioning with the support mold base 300. Then, the upper forming module 202 is controlled to slide away from the outer wall of the formed soluble core 800 through the demolding structure on the support mold base 300. Finally, the horizontal rod of the inner core mold 100 is lifted, and the integrated soluble core assembly formed by the inner core mold 100, the soluble core 800 and the correction ring 700 is pulled out of the support mold base 300, so that the soluble core assembly is separated from the lower forming module 201 to complete the demolding. Preferably, the wall surface of the support mold base 300, the pressing plate 4011, the upper forming module 202 and the lower forming module 201 are sprayed with a demolding agent to facilitate smooth demolding and avoid affecting the forming quality of the outer surface of the soluble core 800.

[0054] According to another aspect of the present application, a compression molding method using the soluble core preparation device is also provided, and the steps are as follows:

[0055] S1, installing the soluble core preparation device: positioning and installing the outer mold on the support mold base, then placing the correction ring on the support mold base and fitting it to the inner wall of the outer mold, then installing the inner core mold in the inner cavity of the outer mold to form a preparation cavity between the outer mold and the inner core mold, and finally locking the wax injection mold cover to the outer periphery of the outer mold to press the inner core mold and the outer mold;

[0056] S2, then the installed soluble core preparation device is put into the heater for preheating, so that it is heated to a preset temperature;

[0057] S3, the wax material is injected into the wax injection cavity through the wax injection mold cover, so that the wax material is uniformly injected into the preparation cavity through the plurality of wax injection holes for the molding of the soluble core, and the molded soluble core, the correction ring and the inner core mold form an integrated soluble core assembly;

[0058] S4, the wax injection mold cover and the outer mold are sequentially disassembled to take out the molded soluble core assembly, and the taken-out soluble core assembly is slowly cooled in the temperature controller, and thus the preparation of the soluble core is completed.

[0059] The soluble core preparation method preheats the soluble core preparation device, and slowly cools the integrated structure of the prepared soluble core 800 and the inner core mold 100 and the correction ring 700 after the integrated structure is taken out as a whole, so as to reduce the temperature difference with the environment, greatly improve the crack, shrinkage and collapse problems of the soluble core 800, and greatly improve the stability and quality of the pressed wax piece, greatly improve the qualified rate of the pressed wax piece, and meet the production requirements.

[0060] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A soluble core preparation device, characterized in that, comprising an inner core mold (100), an outer mold (200) arranged circumferentially around the outer periphery of the inner core mold (100), a support mold base (300) arranged at the bottom and used for positioning and mounting the outer mold (200), and a wax injection mold cover (400) arranged on the outer mold (200) and used for pressing the inner core mold (100) and the outer mold (200) together on the support mold base (300), a preparation cavity (600) for preparing a soluble core (800) is formed between the inner core mold (100) and the outer mold (200), and the inner core mold (100) is used to be integrated with the soluble core (800) in a unitary structure; The outer wall of the inner core mold (100) is provided with a limiting boss which is profiled with the outer wall of the soluble core (800), so that the thickness of the soluble core (800) at different positions is controlled within a predetermined range; The preparation cavity (600) is provided with a correction ring (700), and the correction ring (700) is fitted and mounted on the inner wall of the outer mold (200); The inner wall of the correction ring (700) is provided with a second positioning groove (701) and / or a second positioning block, which is used for clamping and connecting the soluble core (800) in a unitary structure.

2. The soluble core preparation device according to claim 1, characterized in that, The wax injection mold cover (400) comprises a locking module (401) for locking on the outer wall of the outer mold (200) and a wax injection adapter block (402) mounted on the upper end of the locking module (401), a wax injection cavity (500) is formed between the locking module (401) and the wax injection adapter block (402), a plurality of wax injection holes (4013) are arranged circumferentially in the locking module (401), and the wax injection holes (4013) are used for connecting the preparation cavity (600) and the wax injection cavity (500).

3. The soluble core preparation device according to claim 1, characterized in that, The inner core mold (100) is a hollow structure, and the outer wall of the limiting boss is provided with a first positioning groove (101) and / or a first positioning block for clamping the soluble core (800); The first positioning groove (101) and / or the first positioning block are arranged in multiple along the axial direction of the inner core mold (100).

4. The soluble core preparation device according to claim 2, characterized in that, The outer mold (200) comprises a lower forming module (201) and an upper forming module (202) which are positioned and mounted on the support mold base (300) and used for forming the outer mold surface of the soluble core (800), the lower forming module (201) is sleeved on the outer periphery of the correction ring (700), and a plurality of upper forming modules (202) are arranged circumferentially along the outer periphery of the lower forming module (201), and the plurality of upper forming modules (202) are clamped and locked circumferentially. The support mold base (300) is provided with a demolding structure for separating the plurality of upper forming modules (202) from the formed soluble core (800). 5.The soluble core preparation device according to claim 4, characterized in that, The locking module (401) comprises a pressing plate (4011) arranged on the upper forming module (202) and a locking ring (4012) fixed to the pressing plate (4011), and the locking ring (4012) is arranged around the outer periphery of the upper forming module (202) to lock the upper forming module (202) in the radial direction. The outer wall of the upper forming module (202) is provided with a first tapered surface structure with gradually increasing diameter towards the support mold base (300), and the inner wall of the locking ring (4012) is provided with a second tapered surface structure matched with the first tapered surface structure. 6.The soluble core preparation device according to claim 5, characterized in that, The pressing plate (4011) and the support mold base (300) are both provided with positioning grooves for clamping the axial ends of the inner core mold (100) to position and install the inner core mold (100). 7.The soluble core preparation device according to claim 2, characterized in that, The side wall of the wax injection adapter block (402) is provided with a wax injection port (4021), and the wax injection port (4021) and the wax injection cavity (500) are communicated through a wax injection pipe (4022) arranged in the wax injection adapter block (402). 8.The soluble core preparation device according to claim 5, characterized in that, The walls of the support mold base (300), the pressing plate (4011), the upper forming module (202) and the lower forming module (201) facing the preparation cavity (600) are all sprayed with a demolding agent.

9. A method of making a dissolvable core, characterized by, The preparation device for soluble core according to any one of claims 1 to 8, comprising the following steps: S1, installing the preparation device for soluble core: positioning and installing the outer mold (200) on the support mold base (300), then placing the correction ring (700) on the support mold base (300) and fitting it to the inner wall of the outer mold (200), then installing the inner core mold (100) in the inner cavity of the outer mold (200) to form a preparation cavity (600) between the outer mold (200) and the inner core mold (100), and finally locking the wax injection mold cover (400) to the outer periphery of the outer mold (200) to press the inner core mold (100) and the outer mold (200); S2, then put the installed preparation device for soluble core into a heater for preheating, so that it is heated to a preset temperature; S3, injecting wax material into the wax injection cavity (500) through the wax injection mold cover (400), so that the wax material uniformly flows into the preparation cavity (600) through the plurality of wax injection holes (4013) in the wax injection cavity (500) to form the soluble core (800); the soluble core (800) after forming is integrated with the correction ring (700) and the inner core mold (100) to form a soluble core assembly; S4, sequentially disassembling the wax injection mold cover (400) and the outer mold (200) to take out the soluble core assembly after forming, and slowly cooling the taken-out soluble core assembly in a temperature controller, thereby completing the preparation of the soluble core (800).

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