Manufacturing process of wax mold shell
By filling and sealing deep through holes in the wax model shell manufacturing process, the sand-pulling problem caused by unstable slurry condensation is solved, and the molding quality of the casting is improved.
Patent Information
- Application Number
- CN202510862805.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-25
- Publication Date
- 2025-08-15
AI Technical Summary
During the shell making process, the deep through hole slurry is not solidified, which makes it easy to flush deep through holes when the metal liquid is injected, causing sand-pulling problems in castings and affecting the forming quality.
In the wax model shell manufacturing process, by filling the filler at the deep through hole position and sealing it with a sealing material, a solid structure is formed to enhance the structural strength of the position and avoid metal liquid rushing.
It effectively avoids the deep through-hole position of the metal liquid, improves the molding quality of the casting, and prevents sand punching and sand sticking problems.
Smart Images
Figure CN120480111A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of investment casting, in particular to a wax model shell manufacturing process. Background Art
[0002] A wax pattern is a temporary model used in the casting process and plays a central role in lost wax casting (also known as investment casting).
[0003] The lost wax casting process is roughly as follows: make a reusable mold; inject wax into the mold and obtain a wax model after cooling; assemble the prepared wax model into a wax tree; make a shell on the surface of the wax tree; melt the wax tree inside the shell to achieve dewaxing and obtain an empty shell; roast and reinforce the prepared empty shell and preheat it; pour molten metal (such as aluminum alloy, stainless steel, titanium alloy, gold, silver, etc.) into the empty shell; after the metal liquid cools and solidifies, break the shell to obtain a rough part; and post-process the rough part.
[0004] However, for Figure 2 The wax mold head 20 with the deep through hole 21 structure shown in the figure has the following problems in the shell making process: due to the long length of the deep through hole 21, for example Figure 1 The deep through hole 21 of the wax mold head 20 has a diameter of 6.6 mm and a length of 80 mm. Due to the large length of the deep through hole 21, the slurry is easily solidified and unstable during the shell making process, which can easily cause sand blasting. Specifically, due to the poor solidification effect of the internal slurry, the molten metal is easily injected into the shell structure at the location of the deep through hole 21, causing the molten metal to overflow and ultimately causing sand blasting problems in the molded casting. This will greatly increase the workload of post-processing. Therefore, in order to solve the above problems, the wax model shell manufacturing process of the present application is proposed. Summary of the Invention
[0005] The object of the present invention is to overcome the deficiencies in the prior art and provide a wax model shell manufacturing process which can improve the shell making quality and thus improve the molding quality of subsequent castings.
[0006] The object of the present invention is achieved through the following technical solutions:
[0007] A wax model shell manufacturing process comprises the following steps:
[0008] Step S100: obtaining a wax mold head and a wax mold piece respectively, and bonding the wax mold piece to the wax mold head to produce a wax tree;
[0009] Step S200: obtaining a topcoat and a surface sand material, applying the topcoat on the wax tree, sprinkling the surface sand material on the topcoat, and drying to form a surface layer on the surface of the wax tree;
[0010] Step S300: obtaining a transition coating and a transition sand material, and performing at least one transition process to form a transition layer on the surface layer, wherein the transition process comprises applying the transition coating on the surface layer, sprinkling the transition sand material on the transition coating, and drying to form the transition layer;
[0011] Step S400: Obtaining a plugging material and a filling material, filling the filling material into the position of the deep through hole on the transition layer, and sealing the plugging material at both ends of the deep through hole on the transition layer, so that the plugging material seals the filling material;
[0012] Step S500: obtaining a reinforcement coating and reinforcement sand material, and performing at least one reinforcement process to form a reinforcement layer on the transition layer and the blocking material, wherein the reinforcement process includes applying the reinforcement coating on the transition layer, sprinkling the reinforcement sand material on the reinforcement coating, and drying to form the reinforcement layer;
[0013] Step S600: obtaining a sealing coating, applying the sealing coating on the reinforcement layer, and drying the coating to form a sealing layer;
[0014] Step S700: placing the wax tree into a high-temperature dewaxing kettle to melt and obtain a wax model shell.
[0015] Optionally, the plugging material is prepared by mixing transition coating and 30-60 mesh mullite sand in a mass ratio of 1:1-1.5 into a paste.
[0016] Optionally, the transition coating is prepared by mixing silica sol and zircon powder in a mass ratio of 1:3.8-4.
[0017] Optionally, the surface sand material, the transition sand material, and the filling material are all 80-120 mesh zircon sand.
[0018] Optionally, the topcoat is formed by mixing silica sol, zircon powder, wetting agent and defoaming agent in a mass ratio of 1:3-3.6:0.002-0.003:0.0015-0.002.
[0019] Optionally, the reinforcement coating is formed by mixing silica sol and mullite powder in a mass ratio of 1:1.6-1.7, and the reinforcement sand material is 16-30 mesh mullite sand.
[0020] Optionally, the sealing coating is prepared by mixing silica sol and mullite powder in a mass ratio of 1:1.4 to 1.6.
[0021] Optionally, applying the topcoat on the wax tree and applying the transition coating on the surface layer specifically includes:
[0022] The wax tree is immersed in the paint at a constant speed within 10 seconds at an inclination angle of 30°, rotated 180° in both forward and reverse directions, and then taken out of the paint at a constant speed within 6 seconds. After the paint drips off, compressed air is used to blow away the bubbles on the surface of the wax tree so that the surface of the wax tree is covered with paint.
[0023] Optionally, before applying the topcoat on the wax tree and applying the transition coating on the surface layer, a pre-wetting step is further included, wherein the pre-wetting step is:
[0024] The wax tree is immersed in the pre-wet slurry at a uniform speed within 10 seconds at an inclination angle of 30°. After rotating 180° in both forward and reverse directions, the wax tree is taken out from the pre-wet slurry at a uniform speed within 6 seconds. After the pre-wet slurry is dripped away, compressed air is used to blow away the bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry, which is silica sol.
[0025] Optionally, the step of sprinkling the surface sand material on the surface coating and the step of sprinkling the transition sand material on the transition coating specifically includes:
[0026] Insert the wax tree with the surface covered with paint into the sand drenching machine and rotate it repeatedly so that its surface is covered with sand. Take the wax tree out of the sand drenching machine and shake it to make the excess sand fall off.
[0027] Compared with the prior art, the present invention has at least the following advantages:
[0028] The wax model shell manufacturing process of the present invention includes the following steps: making a wax tree, making a surface layer, making a transition layer, filling, making a reinforcement layer, making a sealing layer, and melting wax. In the filling process, the position where the deep through hole is located is filled with a filling material and then blocked with a blocking material, so that the wax model shell is formed into a solid structure at the position where the deep through hole is located. In this way, the structural strength of the position is effectively enhanced. When molten metal is subsequently injected into the wax model shell, the molten metal can be effectively prevented from rushing into the structure at the position where the deep through hole is located, thereby improving the molding quality of the casting and avoiding problems such as sand blasting and sand sticking in the casting. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0030] Figure 1 Schematic diagram of a process for manufacturing a wax model shell according to one embodiment of the present invention;
[0031] Figure 2Schematic diagram of the structure of a wax die head according to one embodiment of the present invention;
[0032] Figure 3 Schematic diagram of the structure of a wax tree according to one embodiment of the present invention. DETAILED DESCRIPTION
[0033] In order to facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown.
[0034] A wax model shell manufacturing process comprises the following steps:
[0035] Step S100, making a wax tree: obtaining a wax mold head 30 and a wax mold piece 20 respectively, and bonding the wax mold piece to the wax mold head to make a wax tree 10;
[0036] Step S200, making a surface layer: obtaining a surface coating and a surface sand material, applying the surface coating on the wax tree, sprinkling the surface sand material on the surface coating, and drying to form a surface layer on the surface of the wax tree;
[0037] Step S300, making a transition layer: obtaining a transition coating and a transition sand material, and performing at least one transition process to form a transition layer on the surface layer, wherein the transition process includes applying the transition coating on the surface layer, sprinkling the transition sand material on the transition coating, and drying to form the transition layer;
[0038] Step S400, filling: obtaining a plugging material and a filling material, filling the filling material into the position of the deep through hole on the transition layer, and sealing the plugging material at both ends of the deep through hole on the transition layer, so that the plugging material seals the filling material;
[0039] Step S500, making a reinforcement layer: obtaining a reinforcement coating and reinforcement sand material, and forming a reinforcement layer on the transition layer and the plugging material through at least one reinforcement process, wherein the reinforcement process includes applying the reinforcement coating on the transition layer, sprinkling the reinforcement sand material on the reinforcement coating, and drying to form the reinforcement layer;
[0040] Step S600, making a sealing layer: obtaining a sealing coating, applying the sealing coating on the reinforcement layer, and drying it to form a sealing layer;
[0041] Step S700, melting wax: placing the wax tree into a high-temperature dewaxing kettle to melt and obtain a wax model shell.
[0042] It should be noted that after the surface layer and transition layer are sequentially formed on the wax tree 10, each wax mold 20 is processed as follows: first, a plugging material is used to block one end of the wax mold 20 so that one end of the deep through hole 21 is blocked, and then a filler is filled into the deep through hole 21. Finally, the plugging material is used to block the other end of the deep through hole 21 so that the filler is filled into the deep through hole 21 of each wax mold 20. Then, a reinforcement layer is formed on the basis of the transition layer, and a sealing layer is formed on the reinforcement layer. Finally, the wax tree is melted and removed to obtain a hollow wax model shell. In this way, each deep through hole 21 is filled with filler and then blocked with plugging material, so that the wax model shell is formed into a solid structure at the location of the deep through hole 21. In this way, the structural strength of the location is effectively enhanced. When molten metal is subsequently injected into the wax model shell, the molten metal can be effectively prevented from rushing into the structure at the location of the deep through hole 21, thereby improving the molding quality of the casting and avoiding problems such as sand washing and sand sticking in the casting.
[0043] Example 1:
[0044] A wax model shell manufacturing process comprises the following steps:
[0045] Step S100, making a wax tree: obtaining a wax mold head and a wax mold piece respectively, and bonding the wax mold piece to the wax mold head to make a wax tree;
[0046] Step S200, making a surface layer: obtaining pre-wet slurry, which is silica sol, immersing a wax tree in the pre-wet slurry at a constant speed within 10 seconds at an inclination angle of 30°, rotating the wax tree 180° in both the forward and reverse directions, and then taking the wax tree out of the pre-wet slurry at a constant speed within 6 seconds. After the pre-wet slurry drips away, use compressed air to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry;
[0047] Obtain a topcoat and a top sand material, wherein the topcoat is prepared by mixing silica sol, zircon powder, a wetting agent, and a defoaming agent in a mass ratio of 1:3:0.002:0.0015, and the top sand material is 80-mesh zircon sand. A wax tree is uniformly immersed in the topcoat at a 30° inclination angle within 10 seconds, rotated 180° in both the forward and reverse directions, and then removed from the topcoat at a uniform speed within 6 seconds. After the topcoat drips off, compressed air is used to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the topcoat. The wax tree with the surface covered with the topcoat is inserted into a sand drenching machine and repeatedly rotated so that the surface of the wax tree is covered with the top sand material. The wax tree is removed from the sand drenching machine, shaken to cause excess top sand material to fall off, and dried for 6 hours to form a surface layer on the surface of the wax tree.
[0048] Step S300, making a transition layer: immerse the wax tree again in the pre-wet slurry at a constant speed within 10 seconds at an inclination angle of 30 degrees, rotate it 180 degrees in both the forward and reverse directions, and then take it out of the pre-wet slurry at a constant speed within 6 seconds. After the pre-wet slurry drips off, use compressed air to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry;
[0049] Obtain a transition coating and transition sand, wherein the transition coating is formed by mixing silica sol and zircon powder in a mass ratio of 1:3.8, and the transition sand is 80-mesh zircon sand. A transition layer is formed on the surface layer through two transition processes, wherein the transition process includes immersing a wax tree in the transition coating at a constant speed within 10 seconds at a 30-degree inclination angle, rotating it 180 degrees in both the forward and reverse directions, and then removing the wax tree from the transition coating at a constant speed within 6 seconds. After the transition coating drips off, compressed air is used to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the transition coating, and the wax tree with the surface covered with the transition coating is inserted into a sand drenching machine and repeatedly rotated so that the surface of the wax tree is covered with the transition sand. The wax tree is removed from the sand drenching machine, shaken to cause excess transition sand to fall off, and dried to form a transition layer. The first transition process is dried for 12 hours, and the second transition process is dried for 24 hours.
[0050] Step S400, filling: Obtain a plugging material and a filler, wherein the plugging material is prepared by mixing a transition coating and 30-mesh mullite sand in a mass ratio of 1:1 into a paste, and the filler is 80-mesh zircon sand. The filler is filled into the transition layer at the position of the deep through hole, and the plugging material is sealed at both ends of the deep through hole on the transition layer, so that the plugging material seals the filler;
[0051] Step S500, preparing a reinforcement layer: obtaining a reinforcement coating and reinforcement sand, wherein the reinforcement coating is a mixture of silica sol and mullite powder in a mass ratio of 1:1.6, and the reinforcement sand is 16-mesh mullite sand. The reinforcement layer is formed on the transition layer and the plugging material through two reinforcement processes, the reinforcement process comprising applying the reinforcement coating on the transition layer, sprinkling the reinforcement sand on the reinforcement coating, and drying for 12 hours to form the reinforcement layer;
[0052] Step S600, preparing a sealing layer: obtaining a sealing coating, wherein the sealing coating is prepared by mixing silica sol and mullite powder in a mass ratio of 1:1.4, applying the sealing coating on the reinforcement layer and drying it to form a sealing layer;
[0053] Step S700, melting wax: placing the wax tree into a high-temperature dewaxing kettle to melt and obtain a wax model shell.
[0054] Example 2:
[0055] A wax model shell manufacturing process comprises the following steps:
[0056] Step S100, making a wax tree: obtaining a wax mold head and a wax mold piece respectively, and bonding the wax mold piece to the wax mold head to make a wax tree;
[0057] Step S200, making a surface layer: obtaining pre-wet slurry, which is silica sol, immersing a wax tree in the pre-wet slurry at a constant speed within 10 seconds at an inclination angle of 30°, rotating the wax tree 180° in both the forward and reverse directions, and then taking the wax tree out of the pre-wet slurry at a constant speed within 6 seconds. After the pre-wet slurry drips away, use compressed air to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry;
[0058] Obtain a topcoat and a top sand material, wherein the topcoat is prepared by mixing silica sol, zircon powder, a wetting agent, and a defoaming agent in a mass ratio of 1:3.6:0.003:0.002, and the top sand material is 120-mesh zircon sand. A wax tree is uniformly immersed in the topcoat at a 30° inclination angle within 10 seconds, rotated 180° in both the forward and reverse directions, and then removed from the topcoat at a uniform speed within 6 seconds. After the topcoat drips off, compressed air is used to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the topcoat. The wax tree with the topcoat is inserted into a sand drenching machine and repeatedly rotated so that the surface of the wax tree is covered with the top sand material. The wax tree is removed from the sand drenching machine, shaken to cause excess top sand material to fall off, and dried for 6 hours to form a surface layer on the surface of the wax tree.
[0059] Step S300, making a transition layer: immerse the wax tree again in the pre-wet slurry at a constant speed within 10 seconds at an inclination angle of 30 degrees, rotate it 180 degrees in both the forward and reverse directions, and then take it out of the pre-wet slurry at a constant speed within 6 seconds. After the pre-wet slurry drips off, use compressed air to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry;
[0060] Obtain a transition coating and transition sand, wherein the transition coating is formed by mixing silica sol and zircon powder in a mass ratio of 1:4, and the transition sand is 120-mesh zircon sand. A transition layer is formed on the surface layer through three transition processes, wherein the transition process includes immersing a wax tree in the transition coating at a constant speed within 10 seconds at a 30-degree inclination angle, rotating 180 degrees in both the forward and reverse directions, and then removing the wax tree from the transition coating at a constant speed within 6 seconds. After the transition coating drips off, compressed air is used to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the transition coating, and the wax tree with the surface covered with the transition coating is inserted into a sand drenching machine and repeatedly rotated so that the surface of the wax tree is covered with the transition sand. The wax tree is removed from the sand drenching machine and shaken to cause excess transition sand to fall off and dry to form a transition layer. The first and second transition processes are both dried for 12 hours, and the third transition process is dried for 24 hours.
[0061] Step S400, filling: Obtain a plugging material and a filler, wherein the plugging material is prepared by mixing a transition coating and 60-mesh mullite sand in a mass ratio of 1:1.5 into a paste, and the filler is 120-mesh zircon sand. The filler is filled into the transition layer at the position of the deep through hole, and the plugging material is sealed at both ends of the deep through hole on the transition layer, so that the plugging material seals the filler;
[0062] Step S500, preparing a reinforcement layer: obtaining a reinforcement coating and reinforcement sand, wherein the reinforcement coating is a mixture of silica sol and mullite powder in a mass ratio of 1:1.7, and the reinforcement sand is 30-mesh mullite sand. The reinforcement layer is formed on the transition layer and the plugging material through two reinforcement processes, the reinforcement process comprising applying the reinforcement coating on the transition layer, sprinkling the reinforcement sand on the reinforcement coating, and drying for 12 hours to form the reinforcement layer;
[0063] Step S600, preparing a sealing layer: obtaining a sealing coating, wherein the sealing coating is prepared by mixing silica sol and mullite powder in a mass ratio of 1:1.6, applying the sealing coating on the reinforcement layer and drying it to form a sealing layer;
[0064] Step S700, melting wax: placing the wax tree into a high-temperature dewaxing kettle to melt and obtain a wax model shell.
[0065] Example 3:
[0066] A wax model shell manufacturing process comprises the following steps:
[0067] Step S100, making a wax tree: obtaining a wax mold head and a wax mold piece respectively, and bonding the wax mold piece to the wax mold head to make a wax tree;
[0068] Step S200, making a surface layer: obtaining pre-wet slurry, which is silica sol, immersing a wax tree in the pre-wet slurry at a constant speed within 10 seconds at an inclination angle of 30°, rotating the wax tree 180° in both the forward and reverse directions, and then taking the wax tree out of the pre-wet slurry at a constant speed within 6 seconds. After the pre-wet slurry drips away, use compressed air to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry;
[0069] Obtaining a topcoat and a top sand material, wherein the topcoat is prepared by mixing silica sol, zircon powder, a wetting agent, and a defoaming agent in a mass ratio of 1:3.3:0.0025:0.0018, and the top sand material is 100-mesh zircon sand; immersing a wax tree in the topcoat at a 30° inclination angle for 10 seconds at a uniform speed; rotating the wax tree 180° in both the forward and reverse directions; and removing the wax tree from the topcoat at a uniform speed for 6 seconds; after the topcoat drips off, blowing away bubbles on the surface of the wax tree with compressed air to cover the surface of the wax tree with the topcoat; inserting the wax tree with the topcoat covered into a sand drenching machine and repeatedly rotating it to cover the surface with the top sand material; removing the wax tree from the sand drenching machine, shaking the wax tree to cause excess top sand material to fall off, and drying the wax tree for 6 hours to form a surface layer on the surface of the wax tree;
[0070] Step S300, making a transition layer: immerse the wax tree again in the pre-wet slurry at a constant speed within 10 seconds at an inclination angle of 30 degrees, rotate it 180 degrees in both the forward and reverse directions, and then take it out of the pre-wet slurry at a constant speed within 6 seconds. After the pre-wet slurry drips off, use compressed air to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry;
[0071] Obtain a transition coating and transition sand, wherein the transition coating is formed by mixing silica sol and zircon powder in a mass ratio of 1:3.9, and the transition sand is 100 mesh zircon sand. Four transition processes are performed to form a transition layer on the surface layer, wherein the transition process includes immersing a wax tree in the transition coating at a constant speed within 10 seconds at a 30° inclination angle, rotating 180° in both the forward and reverse directions, and then removing the wax tree from the transition coating at a constant speed within 6 seconds. After the transition coating drips off, compressed air is used to blow away bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the transition coating, and the wax tree with the surface covered with the transition coating is inserted into a sand drenching machine and repeatedly rotated so that the surface of the wax tree is covered with the transition sand. The wax tree is removed from the sand drenching machine and shaken to cause excess transition sand to fall off and dry to form a transition layer. The first transition process, the second transition process, and the third transition process are all dried for 12 hours, and the fourth transition process is dried for 24 hours.
[0072] Step S400, filling: Obtain a plugging material and a filler, wherein the plugging material is prepared by mixing a transition coating and 45-mesh mullite sand at a mass ratio of 1:1.25 into a paste, and the filler is 100-mesh zircon sand. The filler is filled into the transition layer at the position of the deep through hole, and the plugging material is sealed at both ends of the deep through hole on the transition layer, so that the plugging material seals the filler;
[0073] Step S500, preparing a reinforcement layer: obtaining a reinforcement coating and reinforcement sand, wherein the reinforcement coating is a mixture of silica sol and mullite powder in a mass ratio of 1:1.65, and the reinforcement sand is 23-mesh mullite sand. The reinforcement layer is formed on the transition layer and the plugging material through two reinforcement processes, the reinforcement process comprising applying the reinforcement coating on the transition layer, sprinkling the reinforcement sand on the reinforcement coating, and drying for 12 hours to form the reinforcement layer;
[0074] Step S600, preparing a sealing layer: obtaining a sealing coating, wherein the sealing coating is prepared by mixing silica sol and mullite powder in a mass ratio of 1:1.5, applying the sealing coating on the reinforcement layer and drying it to form a sealing layer;
[0075] Step S700, melting wax: placing the wax tree into a high-temperature dewaxing kettle to melt and obtain a wax model shell.
[0076] The embodiments described above only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. The installation / fixing / setting mentioned in the present invention, unless otherwise specifically defined, can be understood to include but not be limited to locking and fixing with screws / screws, welding, or bonding with adhesives, wherein the adhesives used can be finished products available on the market. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.
Claims
1. A wax model shell manufacturing process, characterized in that: The steps include: Step S100: obtaining a wax mold head and a wax mold piece respectively, and bonding the wax mold piece to the wax mold head to produce a wax tree; Step S200: obtaining a topcoat and a surface sand material, applying the topcoat on the wax tree, sprinkling the surface sand material on the topcoat, and drying to form a surface layer on the surface of the wax tree; Step S300: obtaining a transition coating and a transition sand material, and performing at least one transition process to form a transition layer on the surface layer, wherein the transition process comprises applying the transition coating on the surface layer, sprinkling the transition sand material on the transition coating, and drying to form the transition layer; Step S400: Obtaining a plugging material and a filling material, filling the filling material into the position of the deep through hole on the transition layer, and sealing the plugging material at both ends of the deep through hole on the transition layer, so that the plugging material seals the filling material; Step S500: obtaining a reinforcement coating and reinforcement sand material, and performing at least one reinforcement process to form a reinforcement layer on the transition layer and the blocking material, wherein the reinforcement process includes applying the reinforcement coating on the transition layer, sprinkling the reinforcement sand material on the reinforcement coating, and drying to form the reinforcement layer; Step S600: obtaining a sealing coating, applying the sealing coating on the reinforcement layer, and drying the coating to form a sealing layer; Step S700: placing the wax tree into a high-temperature dewaxing kettle to melt it and obtain a wax model shell.
2. The wax model shell manufacturing process according to claim 1, characterized in that: The plugging material is prepared by mixing transition coating and 30-60 mesh mullite sand in a mass ratio of 1:1-1.5 into a paste.
3. The wax model shell manufacturing process according to claim 2, characterized in that: The transition coating is prepared by mixing silica sol and zircon powder in a mass ratio of 1:3.8-4.
4. The wax model shell manufacturing process according to claim 1, characterized in that: The surface sand material, the transition sand material and the filling material are all zircon sand with a mesh size of 80 to 120.
5. The wax model shell manufacturing process according to claim 1, characterized in that: The topcoat is prepared by mixing silica sol, zircon powder, wetting agent and defoaming agent in a mass ratio of 1:3-3.6:0.002-0.003:0.0015-0.
002.
6. The wax model shell manufacturing process according to claim 1, characterized in that: The reinforcement coating is prepared by mixing silica sol and mullite powder in a mass ratio of 1:1.6-1.7, and the reinforcement sand material is 16-30 mesh mullite sand.
7. The wax model shell manufacturing process according to claim 1, characterized in that: The sealing coating is prepared by mixing silica sol and mullite powder in a mass ratio of 1:1.4-1.
6.
8. The wax model shell manufacturing process according to claim 1, characterized in that: The step of applying the topcoat on the wax tree and the step of applying the transition coating on the surface layer specifically includes: The wax tree is immersed in the paint at a constant speed within 10 seconds at an inclination angle of 30°, rotated 180° in both forward and reverse directions, and then taken out of the paint at a constant speed within 6 seconds. After the paint drips off, compressed air is used to blow away the bubbles on the surface of the wax tree so that the surface of the wax tree is covered with paint.
9. The wax model shell manufacturing process according to claim 8, characterized in that: Before applying the topcoat on the wax tree and the transition coating on the surface layer, a pre-wetting step is further included. The pre-wetting step is: The wax tree is immersed in the pre-wet slurry at a uniform speed within 10 seconds at an inclination angle of 30°. After rotating 180° in both forward and reverse directions, the wax tree is taken out from the pre-wet slurry at a uniform speed within 6 seconds. After the pre-wet slurry is dripped away, compressed air is used to blow away the bubbles on the surface of the wax tree so that the surface of the wax tree is covered with the pre-wet slurry, which is silica sol.
10. The wax model shell manufacturing process according to claim 8, characterized in that: The step of sprinkling the surface sand material on the surface coating and the step of sprinkling the transition sand material on the transition coating specifically includes: Put the wax tree with the surface covered with paint into the sand drenching machine and rotate it repeatedly so that its surface is covered with sand. Take the wax tree out of the sand drenching machine and shake it to make the excess sand fall off.