Die for casting planet carrier
By adopting a gating system that combines steel molds with clay cores, the problems of unstable casting quality and low production efficiency have been solved, resulting in cost reduction, process simplification, and improved casting precision. In particular, it ensures high precision and consistency in the casting of complex structural castings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- RIYUE HEAVY IND
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-12
AI Technical Summary
In the existing technology, the problem of unstable casting quality and low production efficiency has not yet been solved. In particular, when manufacturing castings with complex internal structures or high precision requirements, traditional casting methods are complicated, costly and difficult to guarantee dimensional accuracy and stability.
The casting system, which combines an integrated steel mold with a clay core, eliminates the need for sand core fabrication. By directly machining the forming groove on the steel mold, and incorporating reinforcing rings and locating pins, the rigidity and precision of the mold are ensured, simplifying the production process and improving the quality and consistency of the castings.
It significantly reduces production costs, simplifies production processes, improves the dimensional accuracy and surface finish of castings, reduces deformation and surface defects, and enhances production efficiency and product quality consistency.
Smart Images
Figure CN224222675U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field, and in particular relates to a mold for planetary carrier casting. Background Technology
[0002] Manufacturing castings with complex internal structures or high precision requirements has always been a challenge in the foundry industry. Traditional casting methods typically rely on sand cores to form the internal cavities or other complex shapes of the casting. However, this method has some limitations, such as the complexity and high cost of sand core production, and the difficulty in guaranteeing dimensional accuracy and stability. Furthermore, sand cores may deform or crack during high-temperature pouring, leading to unstable casting quality and increased scrap rates. Therefore, how to solve these problems to improve casting quality and production efficiency has become a pressing technical issue for the industry. Utility Model Content
[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a mold that offers lower cost and more stable casting quality.
[0004] The objective of this utility model can be achieved through the following technical solution: a mold for planetary carrier casting, comprising:
[0005] A first mold, wherein a first forming groove is provided on the first mold;
[0006] The second mold is detachably connected to the first mold. The second mold is provided with a second forming groove. When the first mold and the second mold are fixed together, a forming cavity is formed between the first forming groove and the second forming groove. The material of the second mold is steel. A clay core is provided inside the second mold. A pouring groove is provided on the bottom wall of the second mold. A pouring cavity is formed between the pouring groove and the clay core and is connected to the casting cavity.
[0007] In one of the above-mentioned molds for planetary carrier casting, the wall thickness of the second mold is 1-1.2 times the wall thickness of the casting.
[0008] In one of the above-mentioned molds for planetary carrier casting, a reinforcing ring is provided at the bottom of the second mold, and a reinforcing rib is provided inside the reinforcing ring, the reinforcing rib extending from the center of the second mold toward the reinforcing ring.
[0009] In one of the above-mentioned molds for planetary carrier casting, a lifting lug is provided on the outer ring wall of the reinforcing ring.
[0010] In one of the above-mentioned molds for planetary carrier casting, a test block groove is provided on the splicing surface of the second mold. When the first mold and the second mold are fixed together, a test block cavity is formed between the test block groove and the first mold, and the test block cavity is connected to the casting cavity; or a test block core is placed in the test block groove, and a test block cavity is provided in the test block core and is connected to the casting cavity.
[0011] In one of the aforementioned molds for planetary carrier casting, a mud rope groove is provided on the splicing surface of the second mold.
[0012] In the above-mentioned mold for planetary carrier casting, a positioning hole is provided on the splicing surface of the second mold, and a positioning pin is inserted into the positioning hole. When the first mold and the second mold are spliced together, the two ends of the positioning pin extend into the splicing surface of the first mold and the splicing surface of the second mold, respectively.
[0013] In one of the above-mentioned molds for planetary carrier casting, the two ends of the locating pin are symmetrically configured as frustums.
[0014] In the above-mentioned mold for planetary carrier casting, an installation groove is provided at the center of the forming groove, the clay core is inserted and fixed to the installation groove, and the pouring groove is arranged around the installation groove and connected to the installation groove.
[0015] In the above-mentioned mold for planetary carrier casting, a forming hole is provided on the casting surface of the second mold, and a forming part is detachably provided in the forming hole. When the first mold and the second mold are assembled, one end of the forming part extends into the first mold.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] (1) This mold, by combining an integrated steel second mold with a clay core inside, forms a casting system. Compared with the traditional all-ceramic tube casting method, this not only significantly reduces production costs but also simplifies the production process while ensuring casting quality due to the advantages of the material properties. Secondly, due to the difference in shrinkage rates between molten iron and steel, using a steel mold facilitates the demolding process after the casting cools, reducing the risk of casting deformation or surface defects caused by inconsistent shrinkage. In addition, the high-precision casting surface of the steel mold ensures the dimensional accuracy and surface finish of the final casting, improving product quality and consistency.
[0018] (2) By directly machining the forming groove on the steel mold, the steps of making and placing sand cores are eliminated, simplifying the production process, reducing preparation time, and thus improving overall production efficiency; moreover, the steel mold has high rigidity and dimensional stability, which can ensure the accuracy and consistency of the forming groove. Compared with traditional sand cores, it is not easily deformed, which can significantly improve the dimensional accuracy and surface quality of castings. Attached Figure Description
[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;
[0020] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;
[0021] Figure 3 This is a three-dimensional structural diagram of the second mold;
[0022] Figure 4 yes Figure 3 Another perspective illustration;
[0023] Figure 5 This is a schematic diagram of the state of the second mold during the casting process.
[0024] In the figure, 100 is the first mold; 101 is the first connecting plate; 200 is the second mold; 201 is the second forming groove; 202 is the clay core; 203 is the pouring groove; 204 is the reinforcing ring; 205 is the reinforcing rib; 206 is the lifting shaft; 207 is the second connecting plate; 208 is the test block groove; 209 is the mud rope groove; 210 is the positioning hole; 211 is the positioning pin; 212 is the mounting groove; 213 is the flow groove; 214 is the forming hole; 215 is the forming part; and 300 is the casting. Detailed Implementation
[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0027] like Figures 1-5 As shown, a mold for planetary carrier casting includes:
[0028] The first mold 100 is provided with a first forming groove;
[0029] The second mold 200 is detachably connected to the first mold 100. The second mold 200 is provided with a second forming groove 201. When the first mold 100 and the second mold 200 are fixed together, a forming cavity is formed between the first forming groove and the second forming groove 201. The material of the second mold 200 is steel. A clay core 202 is provided inside the second mold 200. A pouring groove 203 is provided on the bottom wall of the second mold 200. A pouring cavity that communicates with the casting cavity is formed between the pouring groove 203 and the clay core 202.
[0030] In this embodiment, the mold, consisting of a single-piece steel second mold 200 and a core 202 within it, forms the casting system. Compared to the traditional all-ceramic tube casting method, this significantly reduces production costs and, due to the advantages of the material properties, simplifies the production process while ensuring casting quality. Secondly, because of the different shrinkage rates of molten iron and steel, using a steel mold facilitates the demolding process after the casting 300 cools, reducing the risk of deformation or surface defects in the casting 300 caused by inconsistent shrinkage. Furthermore, the high-precision casting surface of the steel mold ensures the dimensional accuracy and surface finish of the final casting 300, improving product quality and consistency.
[0031] It is worth mentioning that by directly machining the forming groove on the steel mold, the steps of making and placing sand cores are eliminated, simplifying the production process, reducing preparation time, and thus improving overall production efficiency. Furthermore, the steel mold has high rigidity and dimensional stability, ensuring the accuracy and consistency of the forming groove. Compared with traditional sand cores, it is less prone to deformation, significantly improving the dimensional accuracy and surface quality of casting 300.
[0032] It should be noted that the first mold 100 can be made of the same steel as the second mold 200, or an existing sand core mold can be used.
[0033] Specifically, the wall thickness of the second mold 200 is 1-1.2 times that of the casting wall thickness. It is designed to conform to the shape of the second forming groove 201 to reduce the material cost of the second mold 200. Moreover, during the casting process, the mold needs to withstand the thermal stress of the high-temperature molten iron and the shrinkage stress during the cooling process. If the mold wall thickness is too thin, it may cause the mold to deform or crack. The design with a moderate wall thickness (1-1.2 times that of the casting 300 wall thickness) can ensure strength while avoiding excessive material waste.
[0034] Preferably, a reinforcing ring 204 is provided at the bottom of the second mold 200, and a reinforcing rib 205 is provided inside the reinforcing ring 204, with the reinforcing rib 205 extending from the center of the second mold 200 toward the reinforcing ring 204.
[0035] In this embodiment, the design of the reinforcing ring 204 and the reinforcing rib 205 significantly enhances the structural strength of the bottom of the second mold 200, effectively resisting the pressure and thermal stress brought by the high temperature molten iron during the casting process, reducing the risk of mold deformation, and extending the service life of the mold. Since the reinforced design reduces the possibility of mold deformation during use, it ensures the consistency and stability of the forming cavity, which helps to maintain the dimensional accuracy and surface quality of the casting 300 and reduce the defect rate.
[0036] In a further preferred embodiment, a lifting shaft 206 is provided on the outer ring wall of the reinforcing ring 204. The lifting shaft 206 on the outer ring wall of the reinforcing ring 204 allows the mold to be easily and safely transported by lifting equipment, which is especially important for heavy steel molds and can effectively reduce the risks and labor intensity caused by manual handling.
[0037] It is worth mentioning that the second mold 200 is integrally provided with a second connecting plate 207, while the first mold 100 is provided with a first connecting plate 101. When the first mold 100 and the second mold 200 are assembled, the connecting bolt passes through the first connecting plate 101 and the second connecting plate 207 and is locked by the nut to achieve relative fixation of the first mold 100 and the second mold 200. The upper end of the lifting ring is connected to the second connecting plate 207 to increase the connection strength of the lifting ring.
[0038] In a further preferred embodiment, a test block groove 208 is provided on the splicing surface of the second mold 200. When the first mold 100 and the second mold 200 are fixed together, a test block cavity is formed between the test block groove 208 and the first mold 100, and the test block cavity is connected to the casting cavity; or a test block core is placed in the test block groove, and a test block cavity is provided in the test block core, which is connected to the casting cavity.
[0039] In this embodiment, a test block groove 208 is provided on the splicing surface of the second mold 200. When the first mold 100 and the second mold 200 are fixed together, a test block cavity is formed between the test block groove 208 and the first mold 100. By providing the test block cavity, a small "test block" can be produced simultaneously in each casting process. This test block can reflect the quality status of the same batch of castings 300, including material composition, internal defects, etc. This is very important for real-time monitoring and ensuring the quality of castings 300. Furthermore, the presence of the test block core allows for customization of the test block shape, that is, the production of test blocks of different shapes and sizes as needed, which helps to more accurately conduct various physical, chemical, and mechanical property tests.
[0040] In a further preferred embodiment, the splicing surface of the second mold 200 is provided with a mud rope groove 209. The mud rope (usually made of refractory material) is placed in the mud rope groove 209, which can provide a better sealing effect when the first mold 100 and the second mold 200 are spliced. This helps to prevent molten iron or other casting materials from leaking from the mold splicing surface under high pressure, and ensures the quality of the casting 300.
[0041] like Figure 3 As shown, the end face of the second mold 200 is the splicing surface, that is, the contact surface between the second mold 200 and the first mold 100 when the first mold 100 and the second mold 200 are spliced together.
[0042] Preferably, the second mold 200 has a positioning hole 210 on its casting surface, and a positioning pin 211 is inserted into the positioning hole 210. When the first mold 100 and the second mold 200 are assembled, the two ends of the positioning pin 211 extend into the casting surface of the first mold 100 and the casting surface of the second mold 200, respectively.
[0043] In a further preferred embodiment, the two ends of the positioning pin 211 are symmetrically set as frustums, and the diameter of the positioning pin 211 gradually decreases as it is further away from the center.
[0044] In this embodiment, the positioning pin 211 ensures the precise positioning of the first mold 100 and the second mold 200 during the mold closing process, reducing the problem of inaccurate dimensions of the casting 300 due to positional deviation; moreover, the positioning pin 211 can provide additional support force, reducing the relative movement between the first mold 100 and the second mold 200 caused by the pressure of molten iron during the pouring process, and improving the stability of the entire mold structure.
[0045] The truncated cone-shaped locating pin 211 is narrow at both ends and wider in the middle. This shape makes it easier to insert the locating pin 211 into the locating hole 210 and easier to pull out when the mold needs to be disassembled, providing good operational convenience.
[0046] Preferably, an installation groove 212 is provided at the center of the molding groove, the clay core 202 is inserted and fixed to the installation groove 212, and the casting groove 203 is arranged around the installation groove 212 and is connected to the installation groove 212.
[0047] In this embodiment, by setting the mounting groove 212 at the center of the forming groove, the accurate positioning of the core 202 within the mold can be ensured, which helps to guarantee the accuracy of the internal structure of the casting 300. The stable fixation of the core 202 reduces the possibility of it shifting or floating during the casting process, thereby improving the consistency and reliability of each batch of castings 300. The design of the pouring groove 203 surrounding and communicating with the mounting groove 212 allows for better control of the path and speed of the molten metal entering the cavity. This design facilitates more uniform filling of the entire cavity with molten metal, reducing the probability of defects such as porosity and inclusions, and improving the internal quality of the casting 300.
[0048] It should be noted that a flow channel 213 is provided on the bottom wall of the installation groove 212. When the core 202 is inserted into the installation groove 212, the pouring pipe inside the core 202 is connected to the flow channel 213, and the flow channel 213 is connected to the bottom of the pouring groove 203, so as to realize the connection between the pouring groove 203 and the installation groove 212 after the core 202 is inserted into the installation groove 212.
[0049] In a further preferred embodiment, the second mold 200 has a forming hole 214 on its casting surface, and a forming part 215 is detachably provided in the forming hole 214. When the first mold 100 and the second mold 200 are assembled, one end of the forming part 215 extends into the first mold 100.
[0050] It should be noted that the casting surface refers to the surface of the mold that is in direct contact with the molten iron.
[0051] In this embodiment, the design of the forming part 215 can be used to form specific structures (such as holes, grooves or other detailed features) inside or outside the casting 300. The detachable forming part 215 allows the mold to flexibly adapt to the production needs of different products. By simply replacing different forming parts 215, the production of various castings 300 can be achieved, thus enhancing the versatility of the mold.
[0052] It is worth mentioning that the material of the molding part 215 can be obtained by sand core preparation or by graphite pressing.
[0053] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0054] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0055] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. A mold for planetary carrier casting, characterized in that, include: A first mold, wherein a first forming groove is provided on the first mold; The second mold is detachably connected to the first mold. The second mold is provided with a second forming groove. When the first mold and the second mold are fixed together, a forming cavity is formed between the first forming groove and the second forming groove. The material of the second mold is steel. A clay core is provided inside the second mold. A pouring groove is provided on the bottom wall of the second mold. A pouring cavity is formed between the pouring groove and the clay core and is connected to the casting cavity.
2. The mold for planetary carrier casting according to claim 1, characterized in that, The wall thickness of the second mold is 1-1.2 times that of the casting.
3. A mold for planetary carrier casting according to claim 2, characterized in that, The bottom of the second mold is provided with a reinforcing ring, and a reinforcing rib is provided inside the reinforcing ring. The reinforcing rib extends from the center of the second mold toward the reinforcing ring.
4. A mold for planetary carrier casting according to claim 3, characterized in that, The outer ring wall of the reinforcing ring is provided with lifting lugs.
5. A mold for planetary carrier casting according to claim 1, characterized in that, The second mold has a test block groove on its splicing surface. When the first mold and the second mold are fixed together, a test block cavity is formed between the test block groove and the first mold. The test block cavity is connected to the casting cavity. Alternatively, a test block core is placed in the test block groove, and a test block cavity is provided in the test block core, which is connected to the casting cavity.
6. A mold for planetary carrier casting according to claim 1, characterized in that, The splicing surface of the second mold is provided with a mud rope groove.
7. A mold for planetary carrier casting according to claim 1, characterized in that, The second mold has a positioning hole on its splicing surface, and a positioning pin is inserted into the positioning hole. When the first mold and the second mold are spliced together, the two ends of the positioning pin extend into the splicing surface of the first mold and the splicing surface of the second mold, respectively.
8. A mold for planetary carrier casting according to claim 7, characterized in that, The two ends of the positioning pin are symmetrically set as frustums.
9. A mold for planetary carrier casting according to claim 1, characterized in that, An installation groove is provided at the center of the molding groove. The clay core is inserted and fixed to the installation groove. The casting groove is arranged around the installation groove and is connected to the installation groove.
10. A mold for planetary carrier casting according to claim 1, characterized in that, The second mold has a forming hole on its casting surface, and a forming part is detachably provided in the forming hole. When the first mold and the second mold are joined together, one end of the forming part extends into the first mold.