Development method of supercharger turbine forming process
By using a split-structure cold core blade and main body to form a wax model in a mold, the problem of deformation control of large-size turbine wax models was solved, realizing an efficient and reliable turbine casting process, and improving product consistency and molding efficiency.
Patent Information
- Application Number
- CN202511031244.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2025-11-14
AI Technical Summary
Existing technologies struggle to effectively control the deformation of large-sized turbine wax molds, resulting in low molding efficiency and poor product consistency, necessitating shape adjustments.
The cold core adopts a split structure, including the cold core body and the cold core blades. By setting gaps and interlocking structures in the mold, the deformation of the wax mold is controlled, avoiding the need for shape adjustment and improving molding efficiency and consistency.
This enables direct molding of wax molds to meet casting requirements, improves the reliability of turbine casting molding process and product consistency, and reduces cold core molding costs and adjustment cycles.
Smart Images
Figure CN120940580A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of precision casting technology for turbocharger turbines, and in particular to a method for developing a turbocharger turbine forming process. Background Technology
[0002] In the process of investment casting to form the blades of a turbocharger turbine, the formation of the wax pattern is a very important step, which has a significant impact on the final appearance and dimensions of the casting.
[0003] To control the amount of deformation of the wax model, a cold core with a regular rotating structure is usually placed in the mold for forming the wax model, so as to keep the deformation of the wax model within the tolerance range.
[0004] However, for turbines with larger dimensions (such as diameters of 200 mm and above), the above molding method cannot meet the requirements for controlling the deformation of the wax model. The wax model needs to be reshaped after molding, which affects the molding efficiency. A new molding process needs to be developed that can achieve one-time molding of the wax model, thereby improving molding efficiency. Summary of the Invention
[0005] To address the shortcomings of existing production technologies, the applicant provides a method for developing a turbocharger turbine forming process. This method allows the wax pattern formed in the mold to directly meet the casting requirements for wax pattern deformation, avoiding the need for adjustment of the formed wax pattern through calibration. This results in a standardized casting forming process, improving the reliability of the turbine casting forming process and the consistency of the products.
[0006] The technical solution adopted in this invention is as follows:
[0007] A method for developing a turbocharger turbine forming process includes the following steps:
[0008] S1. Design a mold for molding the wax model according to the structural and dimensional requirements of the turbine to be molded, and obtain the wax model digital model;
[0009] S2. Based on the dimensions of the mold, a preliminary design is made of the cold core used when forming the wax model. The cold core includes a cold core body and cold core blades, wherein the number of cold core blades is the same as the number of wax model blades, and the distance between adjacent cold core blades is the same as the spacing between wax model blades.
[0010] S3. Place the cold core into the mold. There is a first gap between the mold cavity and the cold core body. The cold core blades are located in the cavity corresponding to the wax mold blades. There is a second gap between the cold core blades and the cavity.
[0011] S4. Molding the wax mold: During wax mold molding, the cold core blades are in the wax mold blades to control the shrinkage and deformation of the wax mold blades during molding.
[0012] S5. Measure the external structural dimensions of the wax model based on the wax model digital model, and determine whether the external structural deviation of the wax model blades meets the requirements. If it meets the requirements, proceed with casting. If it does not meet the requirements, adjust the shape of the cold core blades and repeat steps S3-S5.
[0013] As a further improvement to the above technical solution:
[0014] In step S2, the cold core used in the preliminary design of the molding wax model includes the following steps:
[0015] S201. Preliminary Design: The cold core blades and the cold core body are designed as separate structures.
[0016] S202, Cold Core Forming: The cold core blades are formed using blade molds, and the cold core body is formed using body molds;
[0017] S203, Cold Core Assembly: The formed cold core blades and the cold core body are assembled into one piece to form at least one level cold core.
[0018] In step S201, cold core blades of various levels are designed. In step S203, cold cores of various levels are formed. In step S4, wax models of different deformations are formed respectively. In step S5, the external structural dimensions of wax models of different deformations are measured. When one of the wax models meets the requirements, casting is carried out. When all the wax models do not meet the requirements, the wax model with the closest size to the digital model is selected, the shape of the cold core blade is adjusted, and steps S3-S5 are repeated.
[0019] The cold core material is wax. In step S203, the cold core blades and the cold core body are assembled together by bonding or hot stamping.
[0020] The connection between the cold core blade and the cold core body includes the blade root. The bottom of the blade root and the outer surface of the cold core body are provided with a groove on one and a protrusion on the other. The length direction of the groove and the protrusion are both extended along the length direction of the blade root. The protrusion and the groove are inserted to assemble the cold core blade and the cold core body into one piece.
[0021] The groove is located on the outer surface of the cold core body, and the protrusion is located at the bottom of the blade root.
[0022] The bottom of the groove is provided with multiple positioning grooves spaced apart along the length of the leaf root, and the surface of the protrusion facing the groove is provided with multiple positioning blocks that are inserted into the positioning grooves.
[0023] In step S5, the cold core blade shape adjustment step involves adjusting the cold core blade shape based on the deviation of the wax mold blade shape structure. The adjustment method includes adjusting the outline of the cold core blade to change the size of the second gap, and also includes setting a local thinning structure on the cold core blade.
[0024] The cold core body is a rotating body coaxial with the cavity, and the first gap is 2mm-7mm.
[0025] The cold core blades and wax mold blades extend in the same direction, and the second gap is 2mm-5mm.
[0026] The beneficial effects of this invention are as follows:
[0027] This invention features a compact and reasonable structure and is easy to operate. It employs a cold core with blades as a deformation control technique in the turbine casting process for wax model forming. By adjusting the size of the cold core blades during process development, a cold core that meets the requirements for forming the wax model is obtained. This allows the wax model formed in the mold to directly meet the casting requirements for wax model deformation, avoiding the need for adjustment of the formed wax model through calibration. This results in a standardized casting forming process, improving the reliability of the turbine casting forming process and the consistency of the products.
[0028] Furthermore, the present invention also has the following advantages:
[0029] (1) The cold core blades and the cold core body are formed separately, which makes it easier to design and adjust the local structure of the cold core (i.e., the cold core blades) in the design stage of the turbine forming process, targeting the easily deformable wax mold blades. This improves the accuracy of the cold core structure, reduces the cost of cold core forming, and thus reduces the cost of new product development and improves efficiency. Furthermore, the adjustment of the cold core structure, especially the adjustment of the cold core blade structure, is molded, which further improves the reliability of the turbine casting forming process.
[0030] (2) Protrusions and grooves are formed on the blade root and the cold core body respectively, and the positioning connection between the cold core blade and the cold core body is achieved through the plug-in structure.
[0031] (3) By setting multiple positioning grooves and positioning blocks in a mating structure of a groove and a protrusion, the cold core blade is positioned twice after the groove and the protrusion come into contact, thereby reducing the positioning error of the cold core blade caused by the mating gap between the groove and the protrusion.
[0032] (4) Pre-set multiple levels of cold cores, design molds for multiple cold core blades simultaneously, shorten the adjustment cycle of cold core blades, quickly find the adjustment direction of cold core blades, and shorten the development cycle of molding process. Attached Figure Description
[0033] Figure 1 This is a flowchart of the development method of the present invention.
[0034] Figure 2 This is a schematic diagram of the structure of a cold core according to an embodiment of the present invention.
[0035] Figure 3-1 This is a schematic diagram of the structure of a horizontal blade without a cooling core for comparison.
[0036] Figure 3-2 This is a schematic diagram of the cold core structure under the first horizontal condition of the present invention.
[0037] Figure 3-3 This is a schematic diagram of the cold core structure under the second level condition of the present invention.
[0038] Figure 3-4 This is a schematic diagram of the cold core structure under the third level condition of the present invention.
[0039] Figure 4-1 Measurement data were obtained using wax molds for cold core forming of horizontal blades without cold cores.
[0040] Figure 4-2 These are measurement data for the wax mold cold-formed under the first horizontal condition according to the present invention.
[0041] Figure 4-3 These are measurement data for the wax mold cold-molded under the second level condition according to the present invention.
[0042] Figure 4-4 These are measurement data for wax molds cold-formed under third-level conditions according to the present invention.
[0043] Figure 5 This is an exploded view of the cold core structure according to the second embodiment of the present invention.
[0044] Figure 6 This is a schematic diagram of the structure of the cold core body according to the second embodiment of the present invention.
[0045] Figure 7 This is a schematic diagram of the structure of the cold core body according to another embodiment of the present invention.
[0046] Figure 8 This is a schematic diagram of the structure of a cold core blade according to another embodiment of the present invention.
[0047] Figure 9 This is a schematic diagram of the structure of the cold core blade according to the second embodiment of the present invention (from another perspective).
[0048] Among them: 1. Cold core body; 10. Through hole; 101. Positioning structure; 11. Groove; 111. Positioning slot; 2. Cold core blade; 20. Thinning structure; 21. Blade root; 22. Protrusion; 221. Positioning block. Detailed Implementation
[0049] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.
[0050] Example 1:
[0051] like Figure 1 , Figure 2 As shown, the development method of the turbocharger turbine forming process in this embodiment includes the following steps:
[0052] S1. Design a mold for molding the wax model according to the structural and dimensional requirements of the turbine to be molded, and obtain the wax model digital model.
[0053] Specifically, from the turbine structure to the mold design, the shrinkage rate from the mold to the wax model, the shrinkage rate from the wax model to the mold shell, and the shrinkage rate from the mold shell to the casting need to be considered; the wax model digital model refers to the target structure and dimensions of the wax model that needs to be formed during the process development process.
[0054] S2. Based on the dimensions of the mold, a preliminary design is made of the cold core used when forming the wax model. The cold core includes a cold core body 1 and cold core blades 2. The number of cold core blades 2 is the same as the number of wax model blades, and the distance between adjacent cold core blades 2 is the same as the spacing between wax model blades.
[0055] The cold core with cold core blade 2 is suitable for wax molding of turbines with a diameter greater than or equal to 200 mm, preferably with a diameter of 200 mm to 500 mm, and the cold core is designed to resemble the structure of a wax mold.
[0056] S3. Place the cold core into the mold. There is a first gap between the mold cavity and the cold core body 1. The cold core blade 2 is located in the cavity corresponding to the wax mold blade. There is a second gap between the cold core blade 2 and the cavity.
[0057] Specifically, such as Figure 5 As shown, the cold core body 1 has a through hole 10 at its center, which is used to connect with the gate insert at the center of the mold. The through hole 10 has a positioning structure 101 that cooperates with the gate insert. The positioning structure 101 is a notch at the end of the through hole 10, and the gate insert has a protrusion corresponding to the notch. The positioning of the cold core is achieved by the cooperation of the notch and the protrusion, thereby ensuring the accuracy of the position of the cold core blade 2 in the cavity.
[0058] S4. Molding the wax mold: During wax mold molding, the cold core blade 2 is in the wax mold blade to control the shrinkage and deformation of the wax mold blade during molding.
[0059] By setting multiple cold core blades 2 on the cold core body 1, they serve as "cold cores" for the wax pattern blades during wax pattern forming, thus offsetting the deformation of the wax pattern blades during forming. This facilitates the direct forming of the wax pattern in the mold to meet the casting requirements for the wax pattern deformation.
[0060] S5. Measure the external structural dimensions of the wax model based on the wax model digital model, and determine whether the external structural deviation of the wax model blades meets the requirements. If it meets the requirements, cast the part. If it does not meet the requirements, adjust the external shape of the cold core blade 2 and repeat steps S3-S5.
[0061] Specifically, in step S5, it is also necessary to judge whether the deviation of the shape structure of the cold core body 1 meets the requirements. Under normal circumstances, since the design of the cold core body 1 conforms to the linear dimension design, the control of the shape variable is relatively accurate. The relevant content will not be elaborated here. In the wax mold blade forming process, the deviation is difficult to control. The determination of the corresponding cold core blade 2 contour structure is the main part of the process development process.
[0062] In step S5, the casting process includes the fabrication of the mold shell, followed by the pouring of the casting using the mold shell. After pouring, the external dimensions of the cast part need to be measured based on the structural and dimensional requirements of the turbine to be formed, to determine whether the requirements are met. Generally, the wax model numerical model calculated based on the shrinkage rate matches the shape and structure of the wax model formed using the mold. That is, when the deviation meets the requirements, the casting formed under the corresponding pouring and cooling process conditions can also meet the tolerance requirements.
[0063] The key to developing turbocharger turbine forming technology lies in determining accurate cold core dimensions, thereby ensuring that the wax mold formed using the designed mold meets the requirements, and ultimately producing turbine castings that meet the requirements, thus obtaining a standardized casting forming process.
[0064] In the turbine forming process, a cold core with blades is used as a deformation control technology for wax pattern forming. By adjusting the size of the cold core blades 2 during the process development, a cold core that meets the requirements for forming the wax pattern is obtained. This allows the wax pattern formed in the mold to directly meet the casting requirements for the wax pattern deformation, avoiding the need to adjust the formed wax pattern by shape correction. This results in a standardized casting forming process, improving the reliability of the turbine casting forming process and the consistency of the products.
[0065] In step S5, the cold core blade 2 shape adjustment step involves adjusting the shape of the cold core blade 2 according to the shape structure deviation of the wax mold blade. The adjustment method includes adjusting the outline of the cold core blade 2 to change the size of the second gap, and also includes setting a local thinning structure 20 on the cold core blade 2.
[0066] Specifically, the thinning structure 20 can be a perforation or a pit, and the local deformation of the wax mold blade can be controlled by the thinning structure 20.
[0067] In this embodiment, the cold core body 1 is a rotating body coaxial with the cavity, and the first gap is 2mm-7mm.
[0068] Specifically, the cold core body 1 is a rotating body centered on the axis of the through hole 10. The first gap between different parts of the cavity and the cold core body 1 may be different, and it is sufficient to be within the range of 2mm-7mm.
[0069] The cold core blade 2 extends in the same direction as the wax mold blade, and the second gap is 2mm-5mm.
[0070] Specifically, the extension direction includes the direction of the wax mold blade away from the cold core body 1 and the direction along the radial direction of the cold core body 1; the blade shape of the cold core blade 2 can be consistent with the blade shape of the wax mold blade, that is, when the center point of the cold core blade 2 coincides with that of the wax mold blade, the curved surfaces of the two are equidistantly offset. The blade shape of the cold core blade 2 can also be slightly different from that of the wax mold blade at local positions, thereby offsetting local shrinkage deformation such as thinning, thickening, and torsion; the second gap between the wax mold blade and the cold core blade 2 at different parts of the cavity may be different, which can be satisfied within the range of 2mm-7mm.
[0071] The table below compares the results of cold core forming wax molds under four different horizontal conditions. Conditions one, two, and three represent the process data for adjusting the shape of the cold core blade 2 based on the wax mold measurement results.
[0072] Table 1 compares the results of cold-core molding wax models under four different horizontal conditions.
[0073]
[0074] Figure 4-1 , Figure 4-2 , Figure 4-3 and Figure 4-4 The data for the four types of horizontal cold-core molded wax models were measured using a Zeiss GOM 3D scanner. The data clearly shows that the wax model with cold-core blades 2 significantly improved the blade collapse phenomenon. Furthermore, by adjusting the shape of the cold-core blades 2, the blade shape of the wax model was gradually corrected, ultimately resulting in a wax model that meets the requirements.
[0075] Example 2:
[0076] Because the cold core structure may not meet the requirements during the development of new products, it is necessary to adjust the cold core structure, especially the cold core blade 2 part, multiple times. When the cold core is made of wax, the local structure of the cold core blade 2 can be adjusted manually to make the blade shape and blade thickness of the final trial casting meet the requirements. However, the accuracy is low and it is not possible to guarantee that the size of each cold core blade 2 is consistent, which is not conducive to accurately determining the turbine production process. However, if the mold of the integrally formed cold core is repaired, the cost is high and the cycle is long.
[0077] The design of the cold core body 1 conforms to linear dimension design, and the control of deformation is relatively accurate. However, the deviation of the blade profile is difficult to control during the wax mold forming process. In this embodiment, the cold core is designed as a split structure. The development method of the turbocharger turbine forming process in this embodiment is based on the detailed design of the method in Embodiment 1, including the following steps:
[0078] S1. Design a mold for molding the wax model according to the structural and dimensional requirements of the turbine to be molded, and obtain the wax model digital model.
[0079] S2. Based on the dimensions of the mold, a preliminary design is made of the cold core used when forming the wax model. The cold core includes a cold core body 1 and cold core blades 2. The number of cold core blades 2 is the same as the number of wax model blades, and the distance between adjacent cold core blades 2 is the same as the spacing between wax model blades.
[0080] In step S2, the cold core used in the preliminary design of the molding wax model includes the following steps:
[0081] S201, Preliminary Design: The cold core blade 2 and the cold core body 1 are designed as separate structures, such as... Figure 5 As shown;
[0082] S202, Cold core forming: The cold core blade 2 is formed by blade mold, and the cold core body 1 is formed by body mold;
[0083] S203, Cold core assembly: The formed cold core blades 2 and the cold core body 1 are assembled together to form at least one horizontal cold core.
[0084] S3. Place the cold core into the mold. There is a first gap between the mold cavity and the cold core body 1. The cold core blade 2 is located in the cavity corresponding to the wax mold blade. There is a second gap between the cold core blade 2 and the cavity.
[0085] S4. Molding the wax mold: During wax mold molding, the cold core blade 2 is in the wax mold blade to control the shrinkage and deformation of the wax mold blade during molding.
[0086] S5. Measure the external structural dimensions of the wax model based on the wax model digital model, and determine whether the external structural deviation of the wax model blades meets the requirements. If it meets the requirements, cast the part. If it does not meet the requirements, adjust the external shape of the cold core blade 2 and repeat steps S3-S5.
[0087] After the cold core blade 2 and the cold core body 1 are formed separately, the local dimensions of the casting blade can be adjusted by individually changing the forming mold (i.e., the blade mold) of the cold core blade 2. Compared with the mold for forming the cold core as a whole, the forming mold of the cold core blade 2 has a simpler structure and shorter development cycle, which facilitates the adjustment of the cold core structure and precision forming during the development process. For example, when the cold core has a split structure, the thinned structure 20 and the cold core blades 2 with different contours can be formed by different blade molds, so as to realize the individual fine adjustment of the cold core structure and shorten the production process design cycle.
[0088] Referring to the schematic diagram of the three horizontal conditions of the cold core in Embodiment 1, in this embodiment, a horizontal cold core refers to a cold core with the same shape of cold core blade 2. When a cold core blade 2 with one shape is assembled with a cold core body 1 with a fixed structure, it becomes a first horizontal cold core. When a cold core blade 2 with another shape is assembled with a cold core body 1 with a fixed structure, it becomes a second horizontal cold core. The shapes of the cold core blades 2 of these two cold cores are different, so the blade deformation of the wax model is also different. As shown in Table 1, the contours and / or thicknesses of the cold core blades 2 of the cold cores of different horizontal conditions are different.
[0089] The cold core blade 2 and the cold core body 1 are formed separately, which facilitates the design and adjustment of the local structure of the cold core (i.e., the cold core blade 2) in the design stage of the turbine forming process, especially for the easily deformable wax mold blade part. This improves the accuracy of the cold core structure, reduces the cost of cold core forming, and thus reduces the cost and improves efficiency in the new product development process. Furthermore, the mold-based adjustment of the cold core structure, especially the structure adjustment of the cold core blade 2, further improves the reliability of the turbine casting forming process.
[0090] In this embodiment, the cold core material is wax. During cold core assembly in step S203, the cold core blades 2 and the cold core body 1 are assembled together by bonding or hot stamping. This facilitates the separate molding and assembly of the cold core.
[0091] As shown in Figure 4- Figure 9 As shown, the connection between the cold core blade 2 and the cold core body 1 includes a blade root 21. The bottom of the blade root 21 and the outer surface of the cold core body 1 are provided with a groove 11 on one side and a protrusion 22 on the other side. The length direction of both the groove 11 and the protrusion 22 extends along the length direction of the blade root 21. The protrusion 22 and the groove 11 are inserted to assemble the cold core blade 2 and the cold core body 1 into one piece.
[0092] A protrusion 22 and a groove 11 are formed on the blade root 21 of the cold core blade 2 and the cold core body 1, respectively, and the positioning connection between the cold core blade 2 and the cold core body 1 is achieved through the plug-in structure.
[0093] Specifically, the dimensions of the groove 11 and the protrusion 22 in both the length and width directions do not exceed the bottom dimension of the leaf root 21.
[0094] In a specific embodiment, such as Figures 6-9 As shown, the groove 11 is located on the outer surface of the cold core body 1, and the protrusion 22 is located at the bottom of the blade root 21. This facilitates the molding of the cold core body 1 and the protrusion 22, as well as the demolding design of the mold.
[0095] In another embodiment, such as Figure 7 , Figure 8As shown, the bottom of the groove 11 is provided with a plurality of positioning grooves 111 spaced apart along the length of the leaf root 21, and the surface of the protrusion 22 facing the groove 11 is provided with a plurality of positioning blocks 221 that are inserted into the positioning grooves 111.
[0096] Specifically, there are two positioning grooves 111 in each groove 11, both the positioning grooves 111 and the positioning blocks 221 are columnar, there are two positioning blocks 221 on each protrusion 22, and the end of the protrusion 22 is spherical.
[0097] By setting multiple positioning grooves 111 and positioning blocks 221 in the mating structure of a groove 11 and a protrusion 22, the cold core blade 2 is positioned twice after the groove 11 and the protrusion 22 come into contact, thereby reducing the positioning error of the cold core blade 2 caused by the mating gap between the groove 11 and the protrusion 22.
[0098] Example 3:
[0099] To further shorten the development cycle of the molding process, the development method of the turbocharger turbine molding process in this embodiment is further improved based on Embodiment 2, and includes the following steps:
[0100] S1. Design a mold for molding the wax model according to the structural and dimensional requirements of the turbine to be molded, and obtain the wax model digital model.
[0101] S2. Based on the dimensions of the mold, a preliminary design is made of the cold core used when forming the wax model. The cold core includes a cold core body 1 and cold core blades 2. The number of cold core blades 2 is the same as the number of wax model blades, and the distance between adjacent cold core blades 2 is the same as the spacing between wax model blades.
[0102] In step S2, the cold core used in the preliminary design of the molding wax model includes the following steps:
[0103] S201. Preliminary design: Design cold core blades 2 and cold core body 1 at various levels, and cold core blades 2 and cold core body 1 are separate structures;
[0104] S202, Cold core forming: The cold core blade 2 is formed by blade mold, and the cold core body 1 is formed by body mold;
[0105] S203, Cold Core Assembly: The formed cold core blades 2 and the cold core body 1 are assembled into one piece to form a cold core of various levels.
[0106] S3. Place the cold core into the mold. There is a first gap between the mold cavity and the cold core body 1. The cold core blade 2 is located in the cavity corresponding to the wax mold blade. There is a second gap between the cold core blade 2 and the cavity.
[0107] S4. Form wax molds with different deformations respectively. When forming the wax mold, the cold core blade 2 is in the wax mold blade to control the shrinkage and deformation of the wax mold blade during the forming process.
[0108] S5. Measure the external structural dimensions of wax models with different deformations based on the wax model and the digital model. When one of the wax models meets the requirements, cast the part. When none of the wax models meet the requirements, select the wax model with the closest dimensions to the digital model, adjust the shape of the cold core blade 2, and repeat steps S3-S5.
[0109] Multiple levels of cold cores are pre-set, and molds for various cold core blades 2 are designed simultaneously, shortening the adjustment cycle of cold core blades 2, quickly finding the adjustment direction of cold core blades 2, and shortening the development cycle of molding process.
[0110] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.
Claims
1. A method for developing a turbocharger turbine forming process, characterized in that: Includes the following steps: S1. Design a mold for molding the wax model according to the structural and dimensional requirements of the turbine to be molded, and obtain the wax model digital model; S2. Based on the size of the mold, a cold core is initially designed for use when forming the wax model. The cold core includes a cold core body (1) and cold core blades (2). The number of cold core blades (2) is the same as the number of wax model blades, and the distance between adjacent cold core blades (2) is the same as the spacing between wax model blades. S3. Place the cold core into the mold. There is a first gap between the mold cavity and the cold core body (1). The cold core blade (2) is located in the cavity corresponding to the wax mold blade. There is a second gap between the cold core blade (2) and the cavity. S4. Molding wax mold. During wax mold molding, the cold core blade (2) is in the wax mold blade to control the shrinkage and deformation of the wax mold blade during molding. S5. Measure the external structural dimensions of the wax model based on the wax model digital model, and determine whether the external structural deviation of the wax model blade meets the requirements. If it meets the requirements, cast the part. If it does not meet the requirements, adjust the shape of the cold core blade (2) and repeat steps S3-S5.
2. The development method of the turbocharger turbine forming process as described in claim 1, characterized in that: In step S2, the cold core used in the preliminary design of the molding wax model includes the following steps: S201. Preliminary design: The cold core blade (2) and the cold core body (1) are designed as separate structures; S202, Cold core forming: The cold core blade (2) is formed by blade mold, and the cold core body (1) is formed by body mold; S203, Cold core assembly: The formed cold core blades (2) and the cold core body (1) are assembled together to form at least one level cold core.
3. The development method of the turbocharger turbine forming process as described in claim 2, characterized in that: In step S201, cold core blades (2) of various levels are designed. In step S203, cold cores of various levels are formed. In step S4, wax models of different deformations are formed respectively. In step S5, the external structural dimensions of wax models of different deformations are measured. When one of the wax models meets the requirements, casting is carried out. When all the wax models do not meet the requirements, the wax model with the closest size to the digital model is selected to adjust the external shape of the cold core blade (2) and then steps S3-S5 are repeated.
4. The development method of the turbocharger turbine forming process as described in claim 2, characterized in that: The cold core material is wax. In step S203, the cold core blades (2) and the cold core body (1) are assembled together by bonding or hot stamping.
5. The development method of the turbocharger turbine forming process as described in claim 2, characterized in that: The connection between the cold core blade (2) and the cold core body (1) includes a blade root (21). The bottom of the blade root (21) and the outer surface of the cold core body (1) are provided with a groove (11) on one side and a protrusion (22) on the other side. The length direction of the groove (11) and the protrusion (22) are both extended along the length direction of the blade root (21). The protrusion (22) and the groove (11) are inserted to assemble the cold core blade (2) and the cold core body (1) into one piece.
6. The development method of the turbocharger turbine forming process as described in claim 5, characterized in that: The groove (11) is located on the outer surface of the cold core body (1), and the protrusion (22) is located at the bottom of the blade root (21).
7. The development method of the turbocharger turbine forming process as described in claim 6, characterized in that: The bottom of the groove (11) is provided with a plurality of positioning grooves (111) spaced apart along the length of the leaf root (21), and the surface of the protrusion (22) facing the groove (11) is provided with a plurality of positioning blocks (221) that are inserted into the positioning grooves (111).
8. The development method of the turbocharger turbine forming process as described in claim 1, characterized in that: In step S5, the cold core blade (2) shape adjustment step is carried out according to the shape structure deviation of the wax mold blade. The adjustment method includes adjusting the outline of the cold core blade (2) to change the size of the second gap, and also includes setting a local thinning structure (20) on the cold core blade (2).
9. The development method of the turbocharger turbine forming process as described in claim 1, characterized in that: The cold core body (1) is a rotating body coaxial with the cavity, and the first gap is 2mm-7mm.
10. The development method of the turbocharger turbine forming process as described in claim 1, characterized in that: The cold core blade (2) extends in the same direction as the wax mold blade, and the second gap is 2mm-5mm.