A double-gating machine housing casting mold
By setting up a double gate and multiple runner design in the casing casting mold, the problem of uneven metal filling was solved, and uniform metal filling was achieved, reducing porosity and shrinkage defects, and improving the quality and performance of the casting.
Patent Information
- Application Number
- CN202522466530.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-20
AI Technical Summary
Traditional casing casting molds use a single gate design, which leads to uneven filling of molten metal, resulting in defects such as porosity and shrinkage in the molded products.
The casting mold adopts a double-gate housing, with an external gate and an internal gate, which are connected to multiple first and second pouring channels respectively. The ends of the channels are divided into multiple sub-channels, which are connected to the top corner and middle area of the forming cavity respectively. Combined with the design of guide columns and air ducts, it ensures uniform filling of molten metal.
It improves the uniformity of molten metal filling, reduces porosity and shrinkage defects, enhances the density and mechanical properties of castings, and reduces mold processing costs.
Smart Images
Figure CN224939077U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of casting technology, and in particular to a double-gate casting mold for machine housing. Background Technology
[0002] In the field of casing casting, the design of the casting mold plays a decisive role in the final quality of the casing. Traditional casing casting molds typically employ a single-gate design, meaning that only one gating channel is provided to guide the molten metal into the forming cavity.
[0003] In actual casting processes, a single pouring channel severely restricts the flow direction and filling range of molten metal. Molten metal can only enter the molding cavity from a fixed direction, resulting in areas far from the gate arriving later and filling more slowly, while areas closer to the gate fill too quickly. This uneven filling leads to differences in cooling rates and solidification times in different parts of the molding cavity, resulting in various defects in the finished product. Utility Model Content
[0004] The purpose of this utility model is to overcome the shortcomings of the prior art. This utility model provides a double-gate casting mold for machine housing. By setting a first pouring channel and a second pouring channel, the molten metal can be uniformly filled into the molding cavity from multiple directions, which helps to reduce defects such as porosity and shrinkage caused by uneven filling.
[0005] Accordingly, this utility model proposes a double-gate casting mold for a machine housing, the double-gate casting mold for a machine housing comprising: an upper mold and a lower mold disposed above the upper casting mold; The lower mold has a first casting cavity, and the upper mold has a second casting cavity. The upper mold and the lower mold are closed together, and the first casting cavity and the second casting cavity are combined to form a molding cavity. The bottom of the lower mold is provided with an inner gate and an outer gate. The outer gate is connected to the molding cavity based on the first gating channel. The end of the first gating channel is dispersed to form multiple first sub-channels, and one end of each of the multiple first sub-channels is connected to the top corner of the first casting cavity. The ingate is connected to the molding cavity via a second gating channel. The end of the second gating channel is dispersed to form multiple second sub-channels, and one end of each of the multiple second sub-channels is connected to the middle region of the first casting cavity.
[0006] Preferably, either the inner gate or the outer gate is perpendicular to the bottom of the lower mold.
[0007] Preferably, one end of each of the multiple second sub-channels is connected to the apex corner of the middle region of the first casting cavity.
[0008] Preferably, one end of each of the multiple first sub-channels is connected to the apex corner of the edge region of the first casting cavity.
[0009] Preferably, the end face of the lower mold is provided with multiple guide posts, which are located at each of the top corners of the lower mold.
[0010] Preferably, the upper mold is provided with a plurality of guide holes, the upper mold is inserted into the guide post based on the guide holes, and the upper mold can be driven to move closer to or away from the lower mold along the guide post.
[0011] Preferably, the lower mold is provided with multiple first air channels, which are located on both sides of the first casting cavity; The upper mold is provided with multiple second air channels, which are located on both sides of the second casting cavity.
[0012] Preferably, each of the first air ducts is provided with a plurality of first protrusions, and the plurality of first protrusions are evenly distributed on the side wall of the first air duct.
[0013] Preferably, each of the second air ducts is provided with a plurality of second protrusions, which are evenly distributed on the side wall of the second air duct.
[0014] Preferably, the top of the upper mold is provided with an air outlet, and a cap ring is fitted on the air outlet.
[0015] The beneficial effects of this utility model are: This invention provides an external gate and an internal gate in a double-gate casting mold. The end of the first casting channel connected to the external gate is divided into multiple first sub-channels, which are connected to the top corners of the first casting cavity. This ensures that the molten metal can be evenly filled into the top corner area of the molding cavity, effectively reducing defects caused by insufficient filling of the molten metal at the top corners. Similarly, the end of the second casting channel connected to the internal gate is divided into multiple second sub-channels, which are located below the middle area of the first casting cavity. This allows the molten metal to start filling from the middle part of the mold, which helps to improve the uniformity of molten metal filling. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1This is a schematic diagram of the first structure of the double-gate casting mold of this utility model; Figure 2 This is a schematic diagram of the second structure of the double-gate casting mold in this utility model; Figure 3 This is a sectional view of the double-gate casting mold of this utility model; Figure 4 This is a cross-sectional view of the first air duct in this utility model; Figure 5 This is a cross-sectional view of the second air duct in this utility model.
[0018] In the attached diagram, 1. Lower mold; 10. First casting cavity; 11. Inner gate; 12. Outer gate; 13. First pouring runner; 131. First sub-runner; 132. First buffer section; 14. Second pouring runner; 141. Second sub-runner; 142. Second buffer section; 15. Guide hole; 16. First air duct; 161. First boss; 2. Upper mold; 20. Second casting cavity; 21. Guide post; 22. Second air duct; 221. Second boss; 23. Vent; 24. Riser. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0020] Figure 1 This diagram shows the first structural schematic of the double-gating machine housing casting mold of this utility model. Figure 2 This invention illustrates the second structural diagram of the double-gating housing casting mold. Figure 3 A cross-sectional view of the double-gating housing casting mold of this utility model is shown. Figure 4 A cross-sectional view of the first air duct in this invention is shown. Figure 5A cross-sectional view of the second air duct in this utility model is shown. The dual-gate casting mold includes an upper mold 2 and a lower mold 1 disposed below the upper casting mold 2. The lower mold 1 has a first casting cavity 10, and the upper mold 2 has a second casting cavity 20. The upper mold 2 and the lower mold 1 are closed, and the first casting cavity 10 and the second casting cavity 20 are combined to form a molding cavity. The bottom of the lower mold 1 is provided with an inner gate 11 and an outer gate 12. The outer gate 12 is connected to the molding cavity based on a first gating channel. The end of the first gating channel disperses to form multiple first sub-channels 131, and one end of each of the multiple first sub-channels 131 is connected to the apex corner of the first casting cavity 10. The inner gate 11 is connected to the molding cavity based on a second gating channel. The end of the second gating channel disperses to form multiple second sub-channels 141, and one end of each of the multiple second sub-channels 141 is connected to the middle area of the first casting cavity 10. In this embodiment, the end of the first casting channel 13 is distributed to form four first sub-channels 131, and multiple first sub-channels 131 are connected to the apex corner of the first casting cavity 10, ensuring that the molten metal can be uniformly filled into the apex corner area of the molding cavity, effectively reducing defects caused by insufficient filling of molten metal at the apex corner. Similarly, the end of the second casting channel 14 is distributed to form four second sub-channels 141, and multiple second sub-channels 141 are located below the middle area of the first casting cavity 10, so that the molten metal can start filling from the middle part of the casing, which is beneficial to improving the uniformity of molten metal filling. By simultaneously providing an external gate 12 and an internal gate 11, the molten metal can be uniformly filled into the molding cavity from multiple directions, which helps to reduce defects such as porosity and shrinkage caused by uneven filling.
[0021] Furthermore, either the inner gate 11 or the outer gate 12 is perpendicular to the bottom of the lower mold 1. The vertically positioned outer gate 12 or inner gate 11 allows the molten metal entering the molding cavity through the gate to flow into the cavity in a relatively stable manner, reducing turbulence and splashing during the flow process. This ensures a uniform distribution of the molten metal within the cavity and helps reduce defects in the casting caused by insufficient local filling.
[0022] Furthermore, each of the second sub-channels 141 is connected to the apex corner of the middle region of the first casting cavity 10 based on a rounded second buffer portion 142. In this embodiment, the ends of all four second sub-channels 141 are provided with rounded second buffer portions 142. When molten metal flows at high speed from any of the second sub-channels 141 into the apex corner of the middle region of the first casting cavity 10, the rounded second buffer portion 142 can effectively buffer the impact force of the molten metal, preventing the molten metal from eroding the cavity wall at the apex corner, thereby ensuring the dimensional accuracy and surface quality of the cavity. Secondly, the rounded design of the second buffer portion 142 can make the molten metal flow more smoothly into the apex corner of the middle region of the first casting cavity 10, reducing the generation of turbulence and eddies. Turbulence and eddies can easily cause gas to be entrained in the molten metal, forming defects such as pores. The rounded second buffer portion 142 can make the molten metal fill the apex corner region in a laminar flow state, improving the density and mechanical properties of the casting. Ultimately, the second buffer sections 142 at the ends of the four second sub-channels 141 work together to ensure that the molten metal fills the four apex corners of the middle region of the first casting cavity 10 evenly, avoiding local underfilling or overfilling, and ensuring that the performance of each part of the casting is consistent.
[0023] Furthermore, each of the first sub-channels 131 is connected to the apex corner of the edge region of the first casting cavity 10 based on a trumpet-shaped first buffer section 132. The trumpet-shaped first buffer section 132 can gradually expand the flow cross-section of the molten metal, thereby effectively reducing the flow velocity of the molten metal and reducing its impact force on the cavity wall at the apex corner of the edge of the first casting cavity 10. This avoids damage to the cavity wall due to excessive impact, which would affect the dimensional accuracy and surface quality of the casting. The trumpet-shaped structure can make the molten metal flow more smoothly into the apex corner region, reducing the generation of turbulence and eddies. Turbulence and eddies can easily cause gas to be entrained in the molten metal, forming defects such as pores. The trumpet-shaped first buffer section 132 can guide the molten metal to fill the apex corner region in a laminar flow state, improving the density and mechanical properties of the casting.
[0024] It should be noted that, due to the horn-shaped structure, after buffering the impact of molten metal, the molten metal may rebound to a certain extent at the smaller end of the horn. This rebounding molten metal may interfere with the subsequent inflow, causing instability in the flow of molten metal within the molding area, easily leading to defects and reducing the precision of the molding area. Therefore, the precision of the final molded area from the rounded-corner second buffer 142 is higher than that from the horn-shaped first buffer 132. The horn shape is applied to the edge area of the molding cavity, i.e., the horn-shaped first buffer 132 corresponds to the outer shell of the product, which only provides protection and can therefore have its precision appropriately reduced, thus saving on mold processing costs. Conversely, the rounded-corner shape is applied to the middle area of the molding cavity, i.e., the interior of the product, where the rounded-corner second buffer 142 corresponds to the interior of the product. The interior of the product needs to provide positioning or mounting positions for other components, requiring higher precision. Using a lower-precision buffer in areas where higher precision is not required can reduce the production cost of the casting mold.
[0025] Furthermore, the lower mold 1 is provided with a plurality of guide holes 15, each of which is fitted onto a guide post, and the upper mold 2 moves closer to or further away from the lower mold 1 along the surface of the guide post 21. In this embodiment, the lower mold 1 has three guide holes 15, the three guide holes 15 corresponding to the positions of the three guide posts 21, so that the three guide posts 21 can be simultaneously inserted into the three guide holes 15. During the casting process, the upper mold 2 moves downward under the push of the casting machine, and the guide posts 21 inserted in the guide holes can accurately guide the upper mold 2 and the lower mold 1 to close, ensuring that the plastic raw material can be uniformly filled into the cavity.
[0026] Furthermore, the upper mold 2 has multiple guide pillars 21 on its end face, located at each of its apex corners. In this embodiment, the lower mold 1 has four guide pillars 21 on its end face, with three of them located at the three apex corners of the lower mold 1. During the casting process, the upper mold 2 moves downward under the push of the casting machine, and the guide pillars 21 accurately guide the upper mold 2 to close with the lower mold 1, ensuring that the plastic material can evenly fill the cavity. Simultaneously, after the molten metal cools and solidifies in the molding cavity, the mold is opened, and the molded product is ejected from the lower mold 1. The guide pillars 21 maintain a stable guiding function throughout the entire process, ensuring smooth opening and closing of the mold.
[0027] Furthermore, the lower mold 1 is provided with multiple first air channels 16, which are located on both sides of the first casting cavity 10; the upper mold 2 is provided with multiple second air channels 22, which are located on both sides of the second casting cavity 20. In this embodiment, the lower mold 1 is provided with two first air channels 16, which are located on both sides of the first casting cavity 10 respectively. The first air channel 16 has a rectangular cross-section, penetrates a portion of the thickness of the lower mold 1, and its direction is parallel to the length direction of the first casting cavity 10. The inner wall of the first air channel 16 is smoothed to reduce airflow resistance. Similarly, the upper mold 2 is provided with two second air channels 22, and the two second air channels 22 are respectively located on both sides of the second casting cavity 20. The second air channel 22 has a rectangular cross section and penetrates part of the thickness of the lower mold 1. Its direction is parallel to the length direction of the second casting cavity 20, and the inner wall of the second air channel 22 is smoothed to reduce the resistance of air flow. The first air channel 16 and the second air channel 22 can make the cooling air evenly distributed around the forming cavity, effectively improving the cooling efficiency of the casting.
[0028] Furthermore, each of the first air ducts 16 is provided with a plurality of first protrusions 161, which are staggered on two opposite sidewalls of the first air duct 16. In this embodiment, each of the first air ducts 16 is provided with thirty first protrusions 161, of which fifteen first protrusions 161 are distributed on one sidewall of the first air duct 16, and the other fifteen first protrusions 161 are distributed on the opposite sidewall of the first air duct 16. The first protrusions 161 on the two sidewalls are staggered, that is, fifteen first protrusions 161 are provided on one sidewall and fifteen first protrusions 161 are also provided on the opposite sidewall. The first protrusions 161 on the two sidewalls are staggered in the horizontal direction to form a staggered distribution pattern. As air flows within the first air duct 16, it is constantly disturbed from different directions, ensuring that all the air within the first air duct 16 can fully participate in heat exchange. When air flows past a first protrusion 161 on a side wall, vortices are formed behind the first protrusion 161. These vortices break the laminar flow of the air, causing turbulence. Turbulence enhances the heat exchange between the air and the side wall of the first air duct 16 because it makes air molecules more active, increasing the contact frequency and contact area between the air and the side wall, thereby accelerating the heat transfer speed and improving heat dissipation efficiency.
[0029] Furthermore, each of the second air ducts 22 is provided with a plurality of second protrusions 221, and a plurality of first protrusions 161 are staggered on two opposite sidewalls of the first air duct 16. In this embodiment, each of the second air ducts 22 is provided with thirty second protrusions 221, of which fifteen second protrusions 221 are distributed on one sidewall of the second air duct 22, and the other fifteen second protrusions 221 are distributed on the opposite sidewall of the second air duct 22, and the second protrusions 221 on the two sidewalls are staggered, that is, fifteen second protrusions 221 are provided on one sidewall, and fifteen second protrusions 221 are also provided on the opposite sidewall, and the second protrusions 221 on the two sidewalls are staggered in the horizontal direction to form a staggered distribution pattern. As air flows within the second air duct 22, it is constantly disturbed from different directions, ensuring that all the air within the second air duct 22 can fully participate in heat exchange. When air flows past a second protrusion 221 on a side wall, vortices are formed behind the second protrusion 221. These vortices break the laminar flow of the air, causing turbulence. Turbulence can enhance the heat exchange between the air and the side wall of the second air duct 22 because turbulence makes air molecules more active, increasing the contact frequency and contact area between the air and the side wall, thereby accelerating the heat transfer speed and improving heat dissipation efficiency.
[0030] Furthermore, the top of the upper mold 2 is provided with an air vent 23, and a riser 24 is fitted onto the air vent 23. The function of the air vent 23 is to expel air from the mold cavity during the casting process, preventing air stagnation that could lead to defects such as bubbles and voids inside the product, thereby ensuring the appearance quality and mechanical properties of the product. The function of the riser 24 is twofold: firstly, to prevent molten metal from overflowing from the air vent 23 during the casting process, causing mold contamination and material waste; secondly, the silicone riser 24 has a certain degree of elasticity, allowing it to tightly fit the air vent 23 under casting pressure, ensuring good sealing while not affecting the normal expulsion of air.
[0031] In summary, this invention provides an external gate and an internal gate in a double-gate casting mold. The end of the first pouring channel connected to the external gate is dispersed into multiple first sub-channels, which are respectively connected to the apex corner of the first casting cavity. This ensures that the molten metal can be uniformly filled into the apex corner area of the molding cavity, effectively reducing defects caused by insufficient filling of the molten metal at the apex corner. Similarly, the end of the second pouring channel connected to the internal gate is dispersed into multiple second sub-channels, which are located below the middle area of the first casting cavity. This allows the molten metal to start filling from the middle part of the mold, which helps to improve the uniformity of molten metal filling.
[0032] Furthermore, the above description provides a detailed introduction to a double-gate casting mold for a machine casing provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A double-gate casting mold for a machine housing, characterized in that, The dual-gate casting mold includes: an upper mold and a lower mold disposed above the upper casting mold; The lower mold has a first casting cavity, and the upper mold has a second casting cavity. The upper mold and the lower mold are closed together, and the first casting cavity and the second casting cavity are combined to form a molding cavity. The bottom of the lower mold is provided with an inner gate and an outer gate. The outer gate is connected to the molding cavity based on the first pouring channel. The end of the first pouring channel is dispersed to form multiple first sub-channels, and one end of each of the multiple first sub-channels is connected to the top corner of the first casting cavity based on the first buffer section. The ingate is connected to the molding cavity via a second gating channel. The end of the second gating channel is dispersed to form multiple second sub-channels. One end of each of the multiple second sub-channels is connected to the middle region of the first casting cavity via a second buffer section.
2. The double-gate casting mold for a machine housing according to claim 1, characterized in that, Both the inner gate and the outer gate are perpendicular to the bottom of the lower mold.
3. The double-gate casting mold for a machine housing according to claim 1, characterized in that, Each of the second sub-channels is connected to the apex corner of the middle region of the first casting cavity based on the rounded second buffer section.
4. The double-gate casting mold for a machine housing according to claim 1, characterized in that, Each of the first sub-channels is connected to the apex corner of the edge region of the first casting cavity based on the trumpet-shaped first buffer section.
5. The double-gate casting mold for a machine housing according to claim 1, characterized in that, The lower mold has multiple guide holes on its end face, and the guide holes are located at each of the top corners of the lower mold.
6. The double-gate casting mold for a machine housing according to claim 5, characterized in that, The upper mold is provided with multiple guide pillars, which are inserted into the guide holes, and the upper mold can be driven to move closer to or away from the lower mold along the guide pillars.
7. The double-gate casting mold for a machine housing according to claim 1, characterized in that, The lower mold is provided with multiple first air channels, which are located on both sides of the first casting cavity; The upper mold is provided with multiple second air channels, which are located on both sides of the second casting cavity.
8. The double-gate casting mold for a machine housing according to claim 7, characterized in that, Each of the first air ducts is provided with a plurality of first protrusions, which are evenly distributed on the side wall of the first air duct.
9. The double-gate casting mold for a machine housing according to claim 7, characterized in that, Each of the second air ducts is provided with a plurality of second protrusions, which are evenly distributed on the side wall of the second air duct.
10. The double-gate casting mold for a machine housing according to claim 1, characterized in that, The top of the upper mold is provided with an air outlet, and a cap is fitted on the air outlet.