A wax pattern forming process for preformed cold cores

Abstract

The application discloses a prefabricated cold core wax mold forming process, which comprises the following steps: preparing a double-opened female mold on the surface layer of a casting body model, and setting a supporting mold on the outer side of the female mold; setting a supporting shell on the inner side wall of the female mold, and the thickness of the supporting shell is 2-3 mm; uniformly applying a silica-based ceramic core sand on the inner wall of the supporting shell, and removing the supporting shell after the silica-based ceramic core sand is solidified to prepare a hollow silica-based ceramic core mold core; setting the silica-based ceramic core mold core in the female mold, so that a pouring cavity is formed between the silica-based ceramic core mold core and the female mold; configuring wax, including stirring the wax and stirring the wax into paste in a 50 DEG C environment, and injecting the paste wax into the pouring cavity; after the wax is solidified, demolding is performed to obtain a wax mold with the silica-based ceramic core mold core. The application can effectively improve the problem of low smoothness of the surface layer of the wax mold and poor process effect in the existing wax mold forming process.

Description

Technical Field

[0001] This invention relates to the field of wax mold forming technology, specifically to a prefabricated cold core wax mold forming process. Background Technology

[0002] In current product manufacturing, molds are widely used due to their high processing efficiency, good interchangeability, and saving of raw materials. Therefore, in order to promote the development of mold technology, we actively adopt advanced technologies and equipment to improve the manufacturing level of molds.

[0003] In the investment casting process, a fusible wax model is generally made from wax material. Then, several layers of special refractory coating are applied to the wax model. After drying and hardening, a whole shell is formed. The investment model is then melted out of the shell using steam or hot water. The shell is then placed in a sand box and filled with dry sand around it. Finally, the mold is placed in a baking furnace and baked at high temperature. After the mold or shell is baked, molten metal is poured into it to obtain the casting.

[0004] In precision casting, the wax pattern and sand shell are among the most critical factors affecting the quality of castings. They not only determine the dimensional accuracy and surface roughness of the castings, but also directly affect the manufacturing cost and production efficiency of the castings.

[0005] Currently, in existing wax modeling processes, it is often necessary to pour wax into the wax mold 5 to 6 times to obtain a hollow wax model. This process is slow and results in uneven wax model thickness, leading to poor molding results. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to disclose a prefabricated cold core wax mold forming process to improve the problems of uneven wax mold thickness and poor process effect in the existing wax mold forming process.

[0007] To achieve the above and other related objectives, this invention discloses a wax mold forming process for a prefabricated cold core, comprising:

[0008] S1. Prepare a double-openable female mold on the surface of the casting body model, and provide a supporting mold on the outside of the female mold;

[0009] S2. A support shell is provided on the inner wall of the female mold, and the thickness of the support shell is 2 to 3 mm;

[0010] S3. Apply silicon-based ceramic core evenly to the inner wall of the support shell, and remove the support shell after the silicon-based ceramic core has solidified to prepare a hollow silicon-based ceramic core mold.

[0011] S4. The silicon-based ceramic core mold is placed in the assembled female mold, so that a casting cavity is formed between the silicon-based ceramic core mold and the female mold;

[0012] S5. Prepare the wax material, including stirring the wax material and stirring it into a paste at 50°C, and then injecting the paste wax material into the casting cavity;

[0013] S6. After the wax material has solidified, demold to obtain a wax model with a silicon-based ceramic core.

[0014] In one aspect of the present invention, the supporting mold and the female mold are fixedly connected.

[0015] In one aspect of the present invention, the support shell, during its manufacturing process, includes:

[0016] Water glass and quartz powder are mixed in a weight ratio of 1:0.8 to obtain a quartz powder slurry;

[0017] After immersing the negative mold in quartz powder slurry for 1-3 minutes, remove it and place it in a pile of 40-70 mesh quartz sand, and then evenly coat the surface of the casting wax mold with quartz sand.

[0018] Then immerse the casting wax mold in a pool of ammonium chloride water with a concentration of 15-17% for 15-20 minutes, take it out, wash it with water, and then put it into a drying room at 20-35℃ to dry for 1-3 hours.

[0019] Soak in quartz powder slurry for 1-2 minutes, then remove and place in a pile of 20-40 mesh quartz sand;

[0020] Apply quartz sand evenly to the casting wax model, then immerse the casting wax model in a pool of ammonium chloride solution with a concentration of 15-17% for 14-20 minutes, and then dry it. This completes the first sand coating of the casting wax model to construct the supporting shell.

[0021] In one aspect of the present invention, step S5 includes:

[0022] Place the wax material in a mixer and heat it to 50°C before stirring it into a paste.

[0023] The paste-like wax material is injected into the casting cavity under a pressure of 4 atmospheres to cast the wax model of the casting body and the wax model of the gate.

[0024] In one aspect of the present invention, when preparing the wax mold material, fibers are added to the wax mold material, and the fiber content accounts for 1.5% of the total amount of the wax mold material.

[0025] Then, the wax model material is placed in a wax tank and heated to 50°C to melt the wax. The melted wax is stirred for 2-3 hours. After stirring, the wax is pressed to form water-soluble wax.

[0026] In one embodiment of the present invention, step S5 further includes: after the wax material is poured into the casting cavity, it is placed in a vacuum chamber and vacuumed for 2-3 minutes under a pressure of -0.8MPa.

[0027] In one aspect of the present invention, in step S5, a wax material preparation monitoring system is provided, including:

[0028] The data acquisition module acquires real-time performance data of the wax material when it is placed in a mixer, heated to 50°C, and stirred into a paste.

[0029] The real-time performance data of the wax includes the viscosity value of the wax in the mixer, labeled ZNl; and the flow rate value of the wax in the mixer, labeled ZVl.

[0030] Substitute the obtained average flow velocity ZVlj and flow velocity difference CZVl into the formula ZVl=a3*ZVlj-a4*CZVl to calculate the flow velocity value ZVl; where a3 and a4 are both proportionality coefficients.

[0031] The data analysis module substitutes the obtained viscosity value ZNl of the wax in the mixer and the flow rate value ZVl of the wax in the mixer into the formula. In the calculation, the wax formulation coefficient XPL is obtained; where b1 and b2 are both proportionality coefficients.

[0032] The obtained wax configuration factor XPL is compared with the wax configuration factor threshold.

[0033] If the wax configuration coefficient XPL is greater than or equal to the wax configuration coefficient threshold, a configuration signal is generated.

[0034] If the wax configuration coefficient XPL is less than the wax configuration coefficient threshold, a continue stirring signal is generated;

[0035] When the wax material mixing module receives the configuration signal from the data analysis module, it acquires the fiber material data and controls the fiber material addition rate based on the relationship between the fiber material data and the wax material configuration coefficient.

[0036] The fiber material data includes fiber length and fiber content. The fiber length value represents the average length of all fibers to be added and is marked as ZXJ. The fiber content value represents the ratio between the mass of the fibers to be added and the mass of the wax and is marked as ZXB.

[0037] The specific working process of the wax material mixing module is as follows:

[0038] Step 1: Substitute the obtained fiber length value ZXJ and fiber content value ZXB into the formula. In the calculation, the fiber configuration coefficient XPX is obtained; where c1 and c2 are both proportional coefficients.

[0039] Step 2: Substitute the obtained fiber configuration coefficient XPX and wax configuration coefficient XPL into the 3D model; output the fiber addition rate value VX according to the preset curve in the 3D model.

[0040] In one aspect of the present invention, the viscosity value ZNl of the wax material in the mixer is obtained by the following method;

[0041] The mixer is divided into i equal-interval sampling zones according to the height of the mixing vessel. The viscosity value of each sampling zone is obtained by a viscometer and marked as ZNli. The viscosity values ​​ZNli of each sampling zone are summed to calculate the average viscosity and marked as ZNlj. The viscosity difference of each sampling zone ZNli is calculated and marked as CZNl.

[0042] Substitute the obtained average viscosity ZNlj and viscosity difference CZNl into the formula In the calculation, the viscosity value ZNl is obtained; where a1 and a2 are both proportionality coefficients, with a1 taking a value of 0.85 and a2 taking a value of 1.65;

[0043] The flow rate ZVl of the wax material in the mixer was obtained in the following way;

[0044] The mixer is divided into i equally spaced sampling zones according to the height of the mixing vessel. The flow velocity value of each sampling zone is obtained by a flow velocity meter and marked as ZVli. The flow velocity values ​​ZVli of each sampling zone are added together to calculate the average flow velocity and marked as ZVlj. The flow velocity difference of each sampling zone ZVli is calculated and marked as CZVl.

[0045] In one aspect of this invention, the three-dimensional model is constructed as follows: a three-dimensional coordinate system is built with the fiber configuration coefficient as the X-axis, the wax configuration coefficient as the Y-axis, and the output fiber addition speed value as the Z-axis. The fiber configuration coefficient, wax configuration coefficient, and output fiber addition speed value obtained over a historical period are substituted into the corresponding coordinate points in the three-dimensional coordinate system, and all coordinate points are connected to obtain a preset curve.

[0046] In summary, this invention discloses a prefabricated cold-core wax mold molding process that uses a one-time casting process, reducing the number of castings and increasing the wax mold molding speed. Simultaneously, the vacuum treatment prevents core deformation, effectively ensuring the wax mold's forming rate. Furthermore, by increasing the fiber length and content in the wax mold material and ensuring uniform mixing, white fiber accumulation is prevented, and the resulting water-soluble wax mold core has a smooth, pit-free surface. This effectively improves upon the problems of low surface smoothness and poor process results in existing wax mold molding processes. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the process flow of a prefabricated cold core wax mold forming process according to one embodiment of the present invention.

[0049] Figure 2 This is a flowchart illustrating the wax material configuration monitoring system of the present invention. Detailed Implementation

[0050] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] Please see Figure 1 It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0052] Example 1

[0053] Please see Figure 1 This invention discloses a prefabricated cold core wax mold forming process, which can be used to improve the problems of low surface smoothness and poor process effect of wax mold in the existing wax mold forming process.

[0054] The wax model forming process includes at least the following steps.

[0055] First, in step S1, a double-openable female mold is prepared on the surface of the casting model, with a supporting mold placed on the outside of the female mold. The female mold can be made of 20-degree silicon-based ceramic core material, and its thickness on the surface of the casting is 4-5 mm. Simultaneously, the supporting mold and the female mold are fixedly connected to ensure the stability of the female mold during actual use.

[0056] Next, step S2 is performed, where a support shell is installed on the inner wall of the negative mold, and the thickness of the support shell is 2 to 3 millimeters. Specifically, during the preparation of the support shell, firstly, water glass and quartz powder are mixed in a weight ratio of 1:0.8 to obtain a quartz powder slurry. Secondly, the negative mold is immersed in the quartz powder slurry for 1-3 minutes, then removed and placed in a pile of 40-70 mesh quartz sand, and the quartz sand is evenly coated on the surface of the casting wax mold. Thirdly, the casting wax mold is immersed in a pool of 15-17% ammonium chloride water for 15-20 minutes, removed, rinsed with water, and then dried in a drying room at 20-35°C for 1-3 hours. Next, immerse the wax model in quartz powder slurry for 1-2 minutes, then remove it and place it in a pile of 20-40 mesh quartz sand. Finally, evenly coat the wax model with quartz sand, then immerse it in a 15-17% ammonium chloride solution for 14-20 minutes, followed by drying. This completes the first sand coating process for the wax model, thus constructing the support shell. Multiple sand coating processes are permissible for the wax model to enhance the actual strength of the support structure and improve its overall performance.

[0057] It should be noted that in this embodiment, the concentration of water glass is allowed to be 30%.

[0058] Then, step S3 is performed, where a silicon-based ceramic core is evenly coated onto the inner wall of the support shell. After the silicon-based ceramic core has cured, the support shell is removed to prepare a hollow silicon-based ceramic core mold. In this embodiment, a 50-degree silicon-based ceramic core is permissible, and the coating thickness of the silicon-based ceramic core on the surface of the support shell is permissible to be 4-5 mm. Simultaneously, after the colloid has cured, the support shell is removed to construct a hollow silicon-based ceramic core mold.

[0059] Furthermore, in step S4, the silicon-based ceramic core mold is placed within the assembled female mold, forming a casting cavity between the silicon-based ceramic core mold and the female mold. During the actual assembly process, locating pins can be used for connection to ensure the accuracy of the position between the silicon-based ceramic core mold and the female mold.

[0060] Furthermore, step S5 is performed to prepare the wax material, including stirring the wax material and stirring it into a paste at 50°C, and then injecting the paste wax material into the casting cavity.

[0061] Specifically, in the wax preparation process, the wax is placed in a mixer and heated to 50°C before being stirred into a paste. Simultaneously, the paste is injected into the casting cavity under a pressure of 4 atmospheres to cast the wax model of the casting body and the gate component. It is important to note that fibers are added to the wax model material during preparation, with the fiber content accounting for 1.5% of the total wax model material. The wax model material is then placed in a wax tank and heated to 50°C to melt the wax. The melted wax is stirred for 2-3 hours. After stirring, a pressing process is performed to form a water-soluble wax.

[0062] By increasing the length and content of fibers in the wax model material and mixing it thoroughly, white fiber accumulation is prevented, resulting in a smooth and blemish-free surface for the produced water-soluble wax model core.

[0063] It should be noted that after the wax is poured into the casting cavity, it should be placed in a vacuum chamber and vacuumed for 2-3 minutes under a pressure of -0.8MPa. This can effectively increase the density of the wax mold and reduce the air bubble content in the wax mold.

[0064] Finally, step S6 is executed. After the wax material has solidified, the mold is removed to obtain a wax model with a silicon-based ceramic core.

[0065] In summary, this invention discloses a prefabricated cold-core wax mold forming process that employs a one-time casting process, reducing the number of castings and increasing the wax mold forming speed. Simultaneously, the vacuum treatment prevents core deformation, effectively ensuring the wax mold forming rate. Furthermore, by increasing the fiber length and content in the wax mold material and ensuring uniform mixing, white fiber accumulation is prevented, and the resulting water-soluble wax mold core has a smooth, pit-free surface. Therefore, this invention effectively improves upon the problems of low surface smoothness and poor process results in existing wax mold forming processes. Thus, this invention effectively overcomes some practical problems in the prior art, possessing high utilization value and practical significance.

[0066] Example 2

[0067] Based on the above embodiment 1, in S5, a wax material preparation monitoring system is provided, including:

[0068] The data acquisition module acquires real-time performance data of the wax material when it is placed in a mixer, heated to 50°C, and stirred into a paste.

[0069] The real-time performance data of the wax includes the viscosity value of the wax in the mixer, labeled ZNl; and the flow rate value of the wax in the mixer, labeled ZVl.

[0070] The viscosity value ZNl of the wax in the mixer was obtained in the following way;

[0071] The mixer is divided into i equal-interval sampling zones according to the height of the mixing vessel. The viscosity value of each sampling zone is obtained by a viscometer and marked as ZNli. The viscosity values ​​ZNli of each sampling zone are summed to calculate the average viscosity and marked as ZNlj. The viscosity difference of each sampling zone ZNli is calculated and marked as CZNl.

[0072] Substitute the obtained average viscosity ZNlj and viscosity difference CZNl into the formula In the calculation, the viscosity value ZNl is obtained; where a1 and a2 are both proportionality coefficients, with a1 taking a value of 0.85 and a2 taking a value of 1.65;

[0073] The flow rate ZVl of the wax material in the mixer was obtained in the following way;

[0074] The mixer is divided into i equally spaced sampling zones according to the height of the mixing vessel. The flow velocity value of each sampling zone is obtained by a flow velocity meter and marked as ZVli. The flow velocity values ​​ZVli of each sampling zone are summed to calculate the average flow velocity and marked as ZVlj. The flow velocity difference of each sampling zone ZVli is calculated and marked as CZVl.

[0075] Substitute the obtained average flow velocity ZVlj and flow velocity difference CZVl into the formula ZVl=a3*ZVlj-a4*CZVl to calculate the flow velocity value ZVl; where a3 and a4 are both proportionality coefficients, a3 is 1.45 and a4 is 0.23.

[0076] The data analysis module obtains the viscosity value ZNl and flow rate value ZVl of the wax in the mixer from the data acquisition module; and calculates the wax configuration coefficient.

[0077] The specific working process of this data analysis module is as follows:

[0078] Step 1: Substitute the viscosity value ZNl of the obtained wax in the mixer and the flow rate value ZVl of the wax in the mixer into the formula. In the calculation, the wax formulation coefficient XPL is obtained; where b1 and b2 are both proportionality coefficients, with b1 taking the value of 0.95 and b2 taking the value of 1.42.

[0079] Step 2: Compare the obtained wax configuration coefficient XPL with the wax configuration coefficient threshold;

[0080] If the wax configuration coefficient XPL is greater than or equal to the wax configuration coefficient threshold, a configuration signal is generated.

[0081] If the wax configuration coefficient XPL is less than the wax configuration coefficient threshold, a continue stirring signal is generated;

[0082] When the wax material mixing module receives the configuration signal from the data analysis module, it acquires the fiber material data and controls the fiber material addition rate based on the relationship between the fiber material data and the wax material configuration coefficient.

[0083] The fiber material data includes fiber length and fiber content. The fiber length value represents the average length of all fibers to be added and is marked as ZXJ. The fiber content value represents the ratio between the mass of the fibers to be added and the mass of the wax and is marked as ZXB.

[0084] The specific working process of the wax material mixing module is as follows:

[0085] Step 1: Substitute the obtained fiber length value ZXJ and fiber content value ZXB into the formula. In the calculation, the fiber configuration coefficient XPX is obtained; where c1 and c2 are both proportional coefficients, with c1 taking a value of 1.54 and c2 taking a value of 1.98.

[0086] Step 2: Substitute the obtained fiber configuration coefficient XPX and wax configuration coefficient XPL into the 3D model; output the fiber addition rate value VX according to the preset curve in the 3D model;

[0087] The three-dimensional model is constructed as follows: a three-dimensional coordinate system is constructed with the fiber configuration coefficient as the X-axis, the wax configuration coefficient as the Y-axis, and the output fiber addition speed value as the Z-axis. The fiber configuration coefficient, wax configuration coefficient, and output fiber addition speed value obtained in the historical time period are substituted into the corresponding coordinate points in the three-dimensional coordinate system, and all coordinate points are connected to obtain a preset curve.

[0088] This invention, by setting up a wax material configuration monitoring system in S5, can perform real-time data analysis on the state of the wax material in the mixer to obtain the wax material configuration coefficient XPL, thereby determining whether it meets the requirements of the fiber material addition process. Based on the relationship between the fiber material data and the wax material configuration coefficient, the fiber material addition rate is controlled to ensure effective mixing between the fiber and the wax material. By controlling the timing of fiber addition, the fiber can be better dispersed in the wax material, thereby further improving the smoothness and absence of pitting on the surface of the water-soluble wax mold core.

[0089] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A wax mold forming process for a prefabricated cold core, characterized in that, include: S1. Prepare a double-openable female mold on the surface of the casting body model, and provide a supporting mold on the outside of the female mold; S2. A support shell is provided on the inner wall of the female mold, and the thickness of the support shell is 2 to 3 mm; S3. Apply silicon-based ceramic core evenly to the inner wall of the support shell, and remove the support shell after the silicon-based ceramic core has solidified to prepare a hollow silicon-based ceramic core mold. S4. The silicon-based ceramic core mold is placed in the assembled female mold, so that a casting cavity is formed between the silicon-based ceramic core mold and the female mold; S5. Prepare the wax material, including stirring the wax material and stirring it into a paste at 50°C, and then injecting the paste wax material into the casting cavity; S6. After the wax material has solidified, demold to obtain a wax model with a silicon-based ceramic core. The S5 includes a wax configuration monitoring system, which includes: The data acquisition module acquires real-time performance data of the wax material when it is placed in a mixer, heated to 50°C, and stirred into a paste. The real-time performance data of the wax includes the viscosity value of the wax in the mixer, labeled ZNl; and the flow rate value of the wax in the mixer, labeled ZVl. Substitute the obtained average velocity ZVlj and velocity difference CZVl into the formula In the calculation, the flow velocity value ZVl is obtained; where a3 and a4 are both proportionality coefficients; The data analysis module substitutes the obtained viscosity value ZNl of the wax in the mixer and the flow rate value ZVl of the wax in the mixer into the formula. In the calculation, the wax formulation coefficient XPL is obtained; where b1 and b2 are both proportionality coefficients. The obtained wax configuration factor XPL is compared with the wax configuration factor threshold. If the wax configuration coefficient XPL is greater than or equal to the wax configuration coefficient threshold, a configuration signal is generated. If the wax configuration coefficient XPL is less than the wax configuration coefficient threshold, a continue stirring signal is generated; When the wax material mixing module receives the configuration signal from the data analysis module, it acquires the fiber material data and controls the fiber material addition rate based on the relationship between the fiber material data and the wax material configuration coefficient. The fiber material data includes fiber length and fiber content. The fiber length value represents the average length of all fibers to be added and is marked as ZXJ. The fiber content value represents the ratio between the mass of the fibers to be added and the mass of the wax and is marked as ZXB. The specific working process of the wax material mixing module is as follows: Step 1: Substitute the obtained fiber length value ZXJ and fiber content value ZXB into the formula. In the calculation, the fiber configuration coefficient XPX is obtained; where c1 and c2 are both proportional coefficients. Step 2: Substitute the obtained fiber configuration coefficient XPX and wax configuration coefficient XPL into the 3D model; output the fiber addition rate value VX according to the preset curve in the 3D model.

2. The wax mold forming process for prefabricated cold cores according to claim 1, characterized in that, The supporting mold and the female mold are fixedly connected.

3. The wax mold forming process for prefabricated cold cores according to claim 1, characterized in that, The manufacturing process of the support shell includes: Water glass and quartz powder are mixed in a weight ratio of 1:0.8 to obtain a quartz powder slurry; After immersing the negative mold in quartz powder slurry for 1-3 minutes, remove it and place it in a pile of 40-70 mesh quartz sand, and then evenly coat the surface of the casting wax mold with quartz sand. Then immerse the casting wax mold in a pool of ammonium chloride solution with a concentration of 15-17% for 15-20 minutes, remove it, wash it with water, and then dry it in a drying room at 20-35°C for 1-3 hours. Soak in quartz powder slurry for 1-2 minutes, then remove and place in a pile of 20-40 mesh quartz sand; Apply quartz sand evenly to the casting wax model, then immerse the casting wax model in a pool of ammonium chloride solution with a concentration of 15-17% for 14-20 minutes, and then dry it. This completes the first sand coating of the casting wax model to construct the supporting shell.

4. The wax mold forming process for prefabricated cold cores according to claim 1, characterized in that, Step S5 includes: Place the wax material in a mixer and heat it to 50°C before stirring it into a paste. The paste-like wax material is injected into the casting cavity under a pressure of 4 atmospheres to cast the wax model of the casting body and the wax model of the gate.

5. The wax mold forming process for prefabricated cold cores according to claim 1, characterized in that, When preparing the wax model material, fibers are added to the wax model material, and the fiber content accounts for 1.5% of the total amount of wax model material. Then, the wax model material is placed in a wax tank and heated to 50°C to melt the wax. The melted wax is stirred for 2-3 hours. After stirring, the wax is pressed to form water-soluble wax.

6. The wax mold forming process for prefabricated cold cores according to claim 1, characterized in that, Step S5 also includes: after the wax material is poured into the casting cavity, it is placed in a vacuum chamber and evacuated for 2-3 minutes under a pressure of -0.8MPa.

7. The wax mold forming process for prefabricated cold cores according to claim 1, characterized in that, The viscosity value ZNl of the wax in the mixer was obtained in the following way; The mixer is divided into i equal-interval sampling zones according to the height of the mixing vessel. The viscosity value of each sampling zone is obtained by a viscometer and marked as ZNli. The viscosity values ​​ZNli of each sampling zone are summed to calculate the average viscosity and marked as ZNlj. The viscosity difference of each sampling zone ZNli is calculated and marked as CZNl. Substitute the obtained mean viscosity value ZNlj and viscosity difference value CZNl into the formula. The viscosity value ZNl was calculated; where a1 and a2 are proportionality coefficients, with a1 taking a value of 0.85 and a2 taking a value of 1.

65. The flow rate ZVl of the wax material in the mixer was obtained in the following way; The mixer is divided into i equally spaced sampling zones according to the height of the mixing vessel. The flow velocity value of each sampling zone is obtained by a flow velocity meter and marked as ZVli. The flow velocity values ​​ZVli of each sampling zone are added together to calculate the average flow velocity and marked as ZVlj. The flow velocity difference of each sampling zone ZVli is calculated and marked as CZVl.

8. The wax mold forming process for prefabricated cold cores according to claim 1, characterized in that, The three-dimensional model is constructed as follows: a three-dimensional coordinate system is constructed with the fiber configuration coefficient as the X-axis, the wax configuration coefficient as the Y-axis, and the output fiber addition speed value as the Z-axis. The fiber configuration coefficient, wax configuration coefficient, and output fiber addition speed value obtained in the historical time period are substituted into the corresponding coordinate points in the three-dimensional coordinate system, and all coordinate points are connected to obtain the preset curve.

Images