Temperature control structure for die casting mold and die casting mold

Abstract

This utility model relates to the field of die casting technology, and provides a temperature control structure for die casting molds and a die casting mold. The die casting mold has a fixed mold frame, a moving mold frame, and a product cavity. The product cavity is located between the fixed mold frame and the moving mold frame. The temperature control structure includes: a heat insulation plate, which is placed between the fixed mold frame and the die casting machine to block the heat transfer from the die casting mold to the die casting machine; a core, one end of which extends into the product cavity to form a hole-like structure on the casting; a water channel is provided inside the core, and at least part of the inner wall of the water channel is provided with concave and convex structures distributed around the core axis. The cooling medium flows through the water channel to cool the core; the concave and convex structures form local reinforcing ribs or support points on the inner wall of the water channel, which improves the structural rigidity and deformation resistance of the core under high temperature and high pressure loads, making it possible to appropriately reduce the core wall thickness while ensuring the overall strength; the wall thickness reduction can effectively shorten the heat conduction path and improve the thermal response speed of the mold.

Description

Technical Field

[0001] This utility model belongs to the field of die casting technology, specifically relating to a temperature control structure for die casting molds and a die casting mold. Background Technology

[0002] In die-casting molds, a core is required to form the hole-like structure on the casting. The core extends into the mold cavity, and its surface contributes to the inner wall of the hole in the casting. To achieve efficient demolding and control the quality of the casting, the core needs to be effectively cooled. Therefore, cooling channels are usually installed inside the core. The flow of the cooling medium removes heat, lowers the core temperature, reduces thermal stress and adhesion tendency between the casting and the core, thereby improving demolding performance.

[0003] However, the design of cooling channel wall thickness presents a dilemma: if the wall thickness is too large, cooling efficiency will decrease, affecting heat dissipation; if the wall thickness is too small, the core's strength and rigidity will be insufficient, making it prone to deformation or fracture under high pressure and thermal cycling loads. Therefore, how to rationally optimize the cooling channel wall thickness to improve cooling efficiency while ensuring the core structure's strength and rigidity is a key technical challenge in current die-casting mold design. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is: to propose a temperature control structure for die-casting molds and a die-casting mold, by providing at least a portion of the inner wall of the water channels inside the core with concave-convex structures distributed around the core axis. These concave-convex structures form local reinforcing ribs or support points on the inner wall of the water channels, thereby improving the structural rigidity and deformation resistance of the core under high temperature and high pressure loads. This makes it possible to appropriately reduce the core wall thickness while ensuring overall strength. The reduced wall thickness can effectively shorten the heat conduction path and improve the thermal response speed of the mold.

[0005] The technical solution adopted by this utility model to solve its technical problem is to propose a temperature control structure for a die-casting mold. The die-casting mold has a fixed mold frame, a moving mold frame, and a product cavity, wherein the product cavity is located between the fixed mold frame and the moving mold frame. The temperature control structure includes:

[0006] A heat insulation plate is disposed between the fixed mold frame and the die casting machine to block the heat transfer from the die casting mold to the die casting machine;

[0007] A core, one end of which extends into the product cavity, is used to form a hole-like structure on the casting.

[0008] The core is provided with a water channel, and at least a portion of the inner wall of the water channel is provided with a concave-convex structure distributed around the core axis. The cooling medium flows through the water channel to cool the core, wherein the concave-convex structure is used to form a reinforcing structure in at least a portion of the water channel.

[0009] In the temperature control structure for die-casting molds described above, the concave-convex structure is a discontinuous structure along the circumferential direction of the water channel.

[0010] In the temperature control structure for die-casting molds described above, the concave-convex structure is a continuous structure along the circumferential direction of the water channel.

[0011] In the temperature control structure for die-casting molds described above, the concave-convex structure has a continuous toothed profile in cross-section.

[0012] In the temperature control structure for die casting molds described above, the toothed structure has a circular arc transition between adjacent convex teeth.

[0013] In the temperature control structure for die-casting molds described above, the toothed structure has rounded corners on both sides of the protruding teeth.

[0014] In the temperature control structure for die casting molds described above, the thinnest part of the core wall is 3-5 mm.

[0015] In the temperature control structure for die-casting molds described above, the heat insulation plate is made of rubber.

[0016] In the temperature control structure for die-casting molds described above, the heat insulation plate is composed of at least two separate parts joined together.

[0017] The technical solution adopted by this utility model to solve its technical problem is to also propose a die-casting mold, including one of the above-mentioned temperature control structures for die-casting molds.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) By providing concave-convex structures distributed around the core axis on at least part of the inner wall of the water channels inside the core, the concave-convex structures form local reinforcing ribs or support points on the inner wall of the water channels, which improves the structural rigidity and deformation resistance of the core under high temperature and high pressure loads, making it possible to appropriately reduce the core wall thickness while ensuring overall strength; thinning the wall thickness can effectively shorten the heat conduction path and improve the thermal response speed of the mold. This provides a new technical approach to solve the technical problems of "thin-walled and easily damaged" and "insufficient cooling" in traditional die casting molds.

[0020] (2) By installing a heat insulation plate between the fixed mold frame and the die-casting machine, the heat generated during the operation of the die-casting mold is effectively blocked from being conducted to the die-casting machine body, reducing the temperature rise of key components of the die-casting machine and ensuring its stable operation within a safe temperature range. The heat insulation plate not only helps maintain the accuracy and reliability of the equipment, but also provides thermal management support for achieving efficient and continuous automated production.

[0021] (3) The concave-convex structure can be distributed discontinuously or continuously along the circumference of the inner wall of the waterway. Discontinuous distribution is beneficial for reducing flow resistance, adapting to localized enhanced cooling requirements, and facilitating processing; continuous distribution provides more sufficient turbulence effect and circumferential structural support, and is suitable for working conditions with high cooling intensity and high rigidity requirements. By rationally selecting the distribution form, multi-objective optimization between cooling performance, flow resistance, structural strength, and manufacturing process can be achieved, meeting the comprehensive requirements of efficient temperature control and high reliability in different application scenarios. Attached Figure Description

[0022] Figure 1 This is a 3D view of the proposed solution.

[0023] Figure 2 This is the floor plan of this project.

[0024] Figure 3 yes Figure 2 Sectional view of AA.

[0025] Figure 4 This is a plan view of the core in this design.

[0026] Figure 5 yes Figure 4 A cross-sectional view of BB.

[0027] In the diagram, 1 is the fixed mold frame; 2 is the moving mold frame; 3 is the heat insulation plate; 4 is the core; 5 is the water channel; 6 is the concave-convex structure; 7 is the toothed structure; and 8 is the rounded corner. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] like Figures 1 to 5As shown, this solution provides a temperature control structure for a die-casting mold. The die-casting mold has a fixed mold frame 1, a moving mold frame 2, and a product cavity. The product cavity is located between the fixed mold frame 1 and the moving mold frame 2. The temperature control structure includes: a heat insulation plate 3, which is disposed between the fixed mold frame 1 and the die-casting machine to block heat transfer from the die-casting mold to the die-casting machine; a core 4, one end of which extends into the product cavity to form a hole-like structure on the casting; a water channel 5 is provided inside the core 4, and at least a portion of the inner wall of the water channel 5 is provided with concave-convex structures 6 distributed axially around the core 4. Cooling medium flows through the water channel 5 to cool the core 4. The concave-convex structures 6 are used to form a reinforcing structure in at least a portion of the water channel 5.

[0031] During die casting, high-temperature molten metal is injected into the product cavity, continuously transferring a large amount of heat to the mold structure. The fixed mold frame 1 is connected to the die casting machine, causing the heat accumulated during mold operation to be gradually conducted to the die casting machine body through the fixed mold frame 1. If heat continues to accumulate, it may cause localized overheating of the equipment, leading to decreased hydraulic system performance, sensor malfunctions, thermal deformation of metal components, or lubrication failure, thereby affecting the operational stability and service life of the die casting machine. A heat insulation plate 3 is installed between the fixed mold frame 1 and the die casting machine to effectively block the heat conduction path to the equipment body, reducing the temperature rise of key components and ensuring stable operation within a safe temperature range. The heat insulation plate 3 not only helps maintain equipment accuracy and reliability but also provides thermal management support for achieving efficient and continuous automated production.

[0032] The end of the core 4 furthest from the product cavity can be fixed to the fixed mold frame 1, moving mold frame 2, or slider of the die-casting mold to achieve axial support and positioning. The concave-convex structure 6 on the inner wall of the water channel 5 forms a reinforced inner wall structure through locally raised geometric shapes, significantly improving its structural stiffness and resistance to deformation under high temperature and high pressure loads without increasing the external dimensions of the core 4. The raised areas of the concave-convex structure 6 act as local reinforcement structures, increasing the effective cross-sectional moment of inertia of the water channel 5 wall and improving the core 4's resistance to bending and compressive instability. Simultaneously, the concave-convex structure 6 compensates for the strength reduction caused by reducing the core 4 wall thickness by dispersing local stress and providing mechanical support, ensuring structural reliability even with a thinner core 4 wall. The reduced wall thickness significantly shortens the heat conduction distance from the outer surface of the core 4 participating in casting to the cooling medium within the water channel 5, thereby improving cooling efficiency and temperature response. This invention integrates structural reinforcement and heat exchange functions into the inner wall of the cooling channel 5, achieving a synergistic design of lightweight, high rigidity, and efficient cooling for the core 4. This provides a new technical approach to solve the technical problems of "thin-walled fragility" and "insufficient cooling" in traditional die-casting molds.

[0033] In one embodiment, the concave-convex structure 6 is a structure that is discontinuously distributed along the circumferential direction of the inner wall of the waterway 5.

[0034] By setting a discontinuous circumferential concave-convex structure 6 on the inner wall of the water channel 5, the cooling intensity can be spatially differentiated and controlled according to the heat load and process requirements of different areas of the mold. For example, a dense circumferential structure 6 can be retained in the hot spot area to enhance cooling, while the structure can be removed or weakened in areas with external cooling or end filling, thereby creating a more precise and efficient temperature field distribution, avoiding local overcooling or overheating, and improving the overall forming quality of the casting. Designing the circumferential structure 6 as a discontinuous distribution along the inner wall of the water channel 5 not only achieves synergistic optimization of cooling performance, structural strength, and process adaptability, but also embodies the advanced design concept of "cooling on demand and precise temperature control." This solution effectively solves the contradiction between the difficulty of traditional homogeneous cooling structures in balancing end forming quality and heat dissipation requirements of hot spots. It is particularly suitable for mold design of high-precision, complex die-cast parts such as lightweight automotive components, motor housings, and communication base station heat sinks, and has significant technological improvement and industrial application value.

[0035] In another embodiment, the concave-convex structure 6 is a continuous structure along the circumferential direction of the inner wall of the waterway 5.

[0036] The continuous concave-convex structure 6 forms a ring-shaped reinforcing rib effect on the inner wall of the water channel 5, which can effectively improve the compressive and deformation resistance of the water channel 5 wall. Especially under high pressure and high temperature die casting conditions, it can prevent the water channel 5 from collapsing or cracking due to thermal fatigue or mechanical stress, and significantly extend the service life of the core 4. Since the continuous structure is evenly distributed along the circumference, the cooling of the core 4 is more uniform in the circumference, avoiding local overheating or uneven cooling, thereby reducing the concentration of thermal stress in the casting during the solidification process, reducing the risk of defects such as cracking and shrinkage cavities, and improving the dimensional accuracy and surface quality of the casting.

[0037] More preferably, the concave-convex structure 6 has a continuous tooth-like structure 7 in cross-section, and the transition between adjacent convex teeth is rounded, with rounded corners 8 on both sides of the convex teeth.

[0038] The continuous toothed structure 7 serves as an internal turbulence-inducing element, effectively disrupting the laminar boundary layer of the cooling medium, enhancing turbulence intensity, and significantly improving the heat transfer efficiency inside the core 4. On the other hand, it forms circumferential reinforcing ribs in the structure, improving the rigidity and compressive strength of the water channel 5 wall, which helps resist thermal deformation and mechanical stress under high temperature and high pressure conditions.

[0039] The arc transition design between the protruding teeth avoids the abrupt change in flow field caused by the traditional right-angle structure, allowing the cooling medium to smoothly change direction, reducing local eddies and flow resistance, lowering system pressure drop and pumping energy consumption, and preventing local overheating caused by uneven flow.

[0040] Meanwhile, the rounded corners 8 on both sides of the convex teeth effectively alleviate the stress concentration phenomenon in the tooth root area under thermal cycling load, and suppress the initiation and propagation of microcracks; combined with the rounded transition structure of the valley, the overall thermal fatigue resistance of the concave-convex structure 6 is improved, and the service life of the core 4 is extended, which is especially suitable for die casting production environments with frequent start-stop and drastic temperature fluctuations.

[0041] In addition, the smooth surface transitioning from the fillet 8 to the arc reduces the risk of tool wear and microcracks during machining, improves the surface quality of the inner wall of the water channel 5, and reduces the retention and deposition of impurities in the cooling medium, thereby enhancing the system's self-cleaning ability and long-term operational stability.

[0042] In summary, by designing the concave-convex structure 6 as a continuous toothed profile with rounded transitions and rounded corners 8, not only are the technical problems of large flow resistance, stress concentration, and easy fatigue cracking of traditional right-angled toothed structures solved, but also the synergistic optimization and systematic improvement in terms of enhanced heat transfer, structural durability, process feasibility, and system reliability are achieved. It has outstanding substantive features and significant progress, and meets the inventiveness requirements of an invention patent.

[0043] More preferably, the thinnest part of the core 4 wall is 3-5 mm, significantly smaller than the 8-10 mm wall thickness typically achievable in the prior art. The key to achieving such a thin-walled design lies in the presence of a concave-convex structure 6 distributed along the axial direction of the core 4 on the inner wall of the water channel 5. This concave-convex structure 6 effectively enhances the local structural strength and rigidity of the core 4 without relying on increasing the wall thickness, thus overcoming the design bottleneck of traditional die-casting mold cores in balancing strength and cooling performance.

[0044] More preferably, the heat insulation plate 3 is made of rubber, a material with low thermal conductivity and good elasticity. This effectively blocks the heat transfer path between the die-casting mold and the die-casting machine, reducing heat conduction to the equipment body, thereby maintaining the stability of the mold's operating temperature and reducing the risk of deformation of the die-casting machine's template due to uneven thermal expansion. Simultaneously, the elastic properties of rubber give the heat insulation plate 3 good cushioning performance, absorbing mechanical shocks and vibrations during mold closing, reducing damage to the die-casting machine and mold structure, and extending the equipment's service life. Furthermore, during mold installation, the rubber heat insulation plate 3 can accommodate minor flatness errors, achieving surface contact sealing and improving the uniformity and reliability of thermal barrier properties.

[0045] More preferably, the heat insulation plate 3 is composed of at least two separate components joined together. This modular structure allows the heat insulation plate 3 to be installed or replaced in sections on-site, without requiring the complete disassembly of the mold or die-casting machine components. This is particularly suitable for large, complex, or space-constrained mold structures. When localized areas experience wear, aging, or damage due to long-term use, only the damaged components need to be replaced, eliminating the need for complete scrapping, significantly reducing maintenance costs and downtime.

[0046] This solution also proposes a die-casting mold, including the aforementioned temperature control structure for die-casting molds.

[0047] 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.

[0048] 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.

[0049] 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 temperature control structure for a die-casting mold, the die-casting mold having a fixed mold frame, a moving mold frame, and a product cavity, the product cavity being located between the fixed mold frame and the moving mold frame, characterized in that, The temperature control structure includes: A heat insulation plate is disposed between the fixed mold frame and the die casting machine to block the heat transfer from the die casting mold to the die casting machine; A core, one end of which extends into the product cavity, is used to form a hole-like structure on the casting. The core is provided with a water channel, and at least a portion of the inner wall of the water channel is provided with a concave-convex structure distributed around the core axis. The cooling medium flows through the water channel to cool the core, wherein the concave-convex structure is used to form a reinforcing structure in at least a portion of the water channel.

2. The temperature control structure for die-casting molds as described in claim 1, characterized in that, The concave-convex structure is a discontinuous structure along the circumference of the waterway.

3. The temperature control structure for die-casting molds as described in claim 1, characterized in that, The concave-convex structure is a continuous structure along the circumference of the waterway.

4. The temperature control structure for die-casting molds as described in claim 3, characterized in that, The concave-convex structure has a continuous tooth-like profile in cross-section.

5. The temperature control structure for die-casting molds as described in claim 4, characterized in that, The tooth-like structure has a circular arc transition between adjacent convex teeth.

6. The temperature control structure for die-casting molds as described in claim 4, characterized in that, The tooth-like structure has rounded corners on both sides of the protruding teeth.

7. The temperature control structure for die-casting molds as described in claim 1, characterized in that, The thinnest part of the core wall is 3-5 mm.

8. The temperature control structure for die-casting molds as described in claim 1, characterized in that, The heat insulation panel is made of rubber.

9. The temperature control structure for die-casting molds as described in claim 1, characterized in that, The heat insulation panel is composed of at least two separate components joined together.

10. A die-casting mold, characterized in that, Including a temperature control structure for a die-casting mold as described in any one of claims 1 to 9.

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