A water leakage prevention structure for a die-casting mold and a die-casting mold

Abstract

The utility model relates to die casting die technical field provides a kind of water leakage prevention structure and die casting die for die casting die, die casting die has mould frame, needle hole and water channel are provided in mould frame, water cooling pipe is installed in water channel, needle is slidably worn in needle hole, water leakage prevention structure includes: protective sleeve, it is inserted in needle hole and is sleeved in the outer periphery of needle, the guide hole that is penetrated is provided in protective sleeve, needle is slidably worn in guide hole;When needle moves relative to mould frame, needle slides along guide hole, and mechanical isolation layer is formed between needle and mould frame matrix. The design avoids the direct contact between needle and mould frame metal, significantly reduces dry friction, occlusion and risk of injury, effectively slows down the wear rate of inner wall of needle hole. Especially in the area where the distance between needle hole and water channel is small, this structure helps to maintain the stability of the structure wall thickness, delays the local weakness problem caused by long-term wear, thereby greatly reducing the risk of cooling water leakage.

Description

Technical Field

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

[0002] In die casting molds, the mold frame is used to fix the core structure such as the cavity and core. It has multiple functional holes machined inside, including ejector pin holes and cooling water channels.

[0003] Ejector pins are installed in ejector pin holes for product demolding. During each die-casting cycle, the ejector pins need to push the casting forward after mold opening and retract before mold closing, resulting in frequent reciprocating motion within the ejector pin holes. Over long-term operation, without effective guidance and wear-resistant protection, direct metal-to-metal contact can occur between the ejector pins and the mold frame, leading to uneven wear, scoring, or slight diameter expansion on the inner wall of the ejector pin holes.

[0004] High-pressure cooling pipes are embedded in cooling water channels to efficiently cool localized high-temperature areas (such as thick-walled areas or areas near the gate). They typically carry cooling water at a pressure of 1.5–3 MPa. The cooling pipes themselves are metal fittings with strong pressure resistance, but rely on a sealing structure (such as O-rings) between them and the mold frame's water channel holes to prevent high-pressure water leakage.

[0005] In mold structures, cooling channels are often arranged adjacent to or intersecting with ejector pin holes in space, and the two are structurally isolated by a metal wall of a certain thickness (i.e., a "partition wall").

[0006] If the ejector pin hole undergoes non-uniform expansion due to long-term wear, it may lead to a reduction in the thickness of the partition wall in a localized area, resulting in stress concentration. Under the combined effects of thermal cycling and mechanical loads, microcracks are prone to form in this area and gradually propagate. Once the crack penetrates into the cooling water channel or damages the sealing interface between the cooling pipe and the water channel, high-pressure cooling water will leak into the mold interior.

[0007] If cooling water leaks and seeps into the mold cavity, it can cause defects in the casting, such as porosity, cold shuts, and oxide inclusions, significantly increasing the scrap rate. If a large amount of cooling water enters the high-temperature mold cavity and comes into contact with molten metal (such as aluminum alloys or zinc alloys), it may cause violent pressure fluctuations due to instantaneous vaporization, posing a risk of splashing or even explosion, threatening the safety of equipment and operators. In addition, frequent shutdowns to check for leaks, replace water channel components, or repair the mold frame will significantly reduce production efficiency and increase maintenance costs. Utility Model Content

[0008] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is to provide a leak-proof structure and die-casting mold for use in die-casting. This structure involves inserting a protective sleeve into the ejector pin hole and covering the outer periphery of the ejector pin. The protective sleeve has a guide hole inside for the ejector pin to slide through. When the ejector pin moves relative to the mold frame, it is precisely guided along the guide hole, forming a mechanical isolation layer between the ejector pin and the mold frame body. This design significantly reduces wear, scratches, and micro-crack propagation on the inner wall of the ejector pin hole, thereby effectively controlling the wear rate in the ejector pin hole area, maintaining a safe wall thickness between the ejector pin hole and the water channel, and preventing water channel wall thinning, perforation, or sealing failure due to excessive local wear, thus greatly reducing the risk of cooling water leakage.

[0009] The technical solution adopted by this utility model to solve its technical problem is to propose a water-proof structure for a die-casting mold. The die-casting mold has a mold frame, and the mold frame is provided with ejector pin holes and water channels. A water-cooling pipe is installed in the water channels, and an ejector pin slides through the ejector pin hole. The water-proof structure includes:

[0010] A protective sleeve is inserted into the ejector pin hole and sleeved around the ejector pin. The protective sleeve has a through guide hole inside, and the ejector pin slides through the guide hole.

[0011] When the ejector pin moves relative to the mold frame, the ejector pin slides along the guide hole to guide the movement of the ejector pin and form an isolation structure between the ejector pin and the mold frame.

[0012] In the above-mentioned anti-leakage structure for die-casting molds, the protective sleeve is disposed at one end of the ejector pin hole near the outer side of the mold frame. One end of the protective sleeve is inserted into the ejector pin hole, and the other end extends to the outside of the mold frame. The length of the protective sleeve is less than the axial length of the ejector pin hole.

[0013] In the above-mentioned leak-proof structure for die-casting molds, the outer peripheral wall of the protective sleeve inserted into the ejector pin hole is provided with an external thread, and the inner wall of the corresponding section of the ejector pin hole is provided with a matching internal thread. The protective sleeve is threadedly connected to the internal thread in the ejector pin hole through the external thread.

[0014] In the above-mentioned leak-proof structure for die-casting molds, the portion of the protective sleeve inserted into the ejector pin hole is pressed in and fixed within the ejector pin hole by an interference fit.

[0015] In the above-mentioned anti-leakage structure for die-casting molds, a recessed cavity is provided on the mold frame. The anti-leakage structure includes a drainage trough provided at the bottom of the recessed cavity, which is used to collect and drain the water accumulated in the recessed cavity.

[0016] In the above-mentioned leak-proof structure for die-casting molds, the drainage groove is located at the junction of the bottom of the cavity and the side wall of the cavity.

[0017] In the above-described leak-proof structure for die-casting molds, the drainage groove extends along the contour of the inner wall of the cavity.

[0018] In the above-mentioned water-proof structure for die-casting molds, a drainage hole is also included that penetrates the mold frame. One end of the drainage hole is connected to the drainage channel, and the other end extends to the outside of the mold frame, so as to allow the water accumulated in the drainage channel to drain out of the mold frame.

[0019] In the above-mentioned leak-proof structure for die-casting molds, the mold frame is provided with a plurality of drainage holes, which are distributed at intervals along the path of the drainage channel.

[0020] 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 water-proof structures for die-casting molds.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) By inserting a protective sleeve into the ejector pin hole and covering the outer periphery of the ejector pin, and with a guide hole inside the protective sleeve for the ejector pin to slide through, the ejector pin moves precisely along the guide hole relative to the mold frame, forming a mechanical isolation layer between the ejector pin and the mold frame body. This design avoids direct contact between the ejector pin and the mold frame metal, significantly reducing the risk of dry friction, seizing, and scoring, effectively slowing down the wear rate of the inner wall of the ejector pin hole, and extending the service life of critical parts of the mold. Especially in areas where the distance between the ejector pin hole and the cooling water channel is small, this structure helps maintain the stability of the structural wall thickness, delays the local weakness problems that may be caused by long-term wear, and thus greatly reduces the risk of cooling water leakage.

[0023] (2) One end of the protective sleeve is fixed into the ejector pin hole by means of threaded connection or interference fit, which realizes the secure installation and precise positioning of the protective sleeve, ensuring that it does not loosen or shift under the environment of die casting vibration and cooling pressure. Among them, threaded connection facilitates disassembly and replacement later, improving maintenance efficiency; interference fit has a simple structure and does not require additional parts, making it suitable for space-constrained occasions. The two fixing methods can be flexibly selected according to actual needs, improving the engineering applicability and maintainability of the structure.

[0024] (3) By setting a drainage groove at the bottom of the mold frame cavity and connecting it to a drainage hole extending to the outside of the mold frame, a complete drainage path of "water collection → flow guidance → external discharge" is formed. This design differs from the traditional method of simply relying on sealing and plugging leaks. It adopts a proactive management strategy of "combining drainage and dredging". Even if a small amount of cooling water seeps out from the water channel or interface and accumulates in the cavity, it can be collected in time and discharged to the outside of the mold through the drainage path, avoiding problems such as corrosion, rust, or lubrication failure caused by water retention. This solution significantly improves the mold's tolerance to leakage water and its operational stability, and is especially suitable for die casting production environments with high humidity and high circulation conditions. Attached Figure Description

[0025] Figure 1 This is a 3D view of the proposed solution.

[0026] Figure 2 This is the floor plan of this project.

[0027] Figure 3 yes Figure 2 A three-dimensional diagram of AA.

[0028] Figure 4 yes Figure 1 A 3D view of the hidden part of the structure.

[0029] Figure 5 This is a 3D view of the protective sleeve and ejector pin in this design.

[0030] Figure 6 This is a 3D view of the protective sleeve in this design.

[0031] In the diagram, 1 is the mold frame; 2 is the ejector pin hole; 3 is the water channel; 4 is the water cooling pipe; 5 is the ejector pin; 6 is the protective sleeve; 7 is the guide hole; 8 is the external thread; 9 is the countersunk cavity; 10 is the drainage groove; and 11 is the drainage hole. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] like Figures 1 to 6As shown, this solution provides a water-proof structure for a die-casting mold. The die-casting mold has a mold frame 1, with ejector pin holes 2 and water channels 3 inside the mold frame 1. A water-cooling pipe 4 is installed inside the water channel 3. An ejector pin 5 slides through the ejector pin hole 2. The water-proof structure includes a protective sleeve 6, which is inserted into the ejector pin hole 2 and sleeved around the outer periphery of the ejector pin 5. A through guide hole 7 is provided inside the protective sleeve 6, and the ejector pin 5 slides through the guide hole 7. When the ejector pin 5 moves relative to the mold frame 1, the ejector pin 5 slides along the guide hole 7, achieving precise guidance of the movement of the ejector pin 5 and forming a mechanical isolation layer between the ejector pin 5 and the base of the mold frame 1.

[0035] During the die-casting process, the ejector pin 5 achieves high-precision linear motion through the guide hole 7 inside the protective sleeve 6 during its reciprocating motion. The guide hole 7 maintains a reasonable fit clearance with the outer diameter of the ejector pin 5, which not only ensures the flexibility and smoothness of the ejector pin 5's movement, but also effectively limits its lateral deviation, thereby significantly improving the motion accuracy and repeatability of the ejection system.

[0036] The main function of the protective sleeve 6 is to form a physical isolation layer between the ejector pin 5 and the mold frame 1 body, preventing the ejector pin 5 from directly contacting the metal of the mold frame 1 body during frequent movement, thereby effectively reducing the risk of dry friction, seizing, and scoring. This design significantly reduces wear, scoring, and microcrack propagation on the inner wall of the ejector pin hole 2, thereby effectively controlling the wear rate in the area of ​​the ejector pin hole 2, maintaining a safe wall thickness between the ejector pin hole 2 and the cooling water channel 3, and preventing the wall of the water channel 3 from thinning, perforating, or failing to seal due to excessive local wear, thus greatly reducing the risk of cooling water leakage.

[0037] Furthermore, the introduction of the protective sleeve 6 improves the stability of the ejector pin 5's movement, reducing problems such as uneven loading, jamming, or bending of the ejector pin 5 caused by poor guidance. Stable ejection not only helps protect the ejector pin 5 itself but also reduces the impact load on other structural components of the mold, further ensuring the structural integrity and operational reliability of the entire mold system.

[0038] The leak-proof structure in this solution not only prevents cooling system failures caused by mechanical wear at the source, but also effectively eliminates a series of safety hazards and product quality defects that may arise from accidental leakage of cooling water coming into contact with high-temperature molten metal. This significantly improves the stability and safety of die-casting production, greatly enhances the surface quality and internal density of castings, reduces rework and scrap rates, and ultimately increases product qualification rates and reduces overall production costs.

[0039] In summary, the leak-proof structure in this solution integrates guidance, wear resistance, isolation, leak prevention, and safety protection. It is an innovative design that combines functionality, reliability, and safety, and is suitable for modern die-casting production environments with high cycle counts and high levels of automation. It has good engineering application prospects and promotional value.

[0040] More preferably, the protective sleeve 6 is disposed at one end of the ejector pin hole 2 near the outside of the mold frame 1, one end of the protective sleeve 6 is inserted into the ejector pin hole 2, and the other end extends to the outside of the mold frame 1, and the length of the protective sleeve 6 is less than the axial length of the ejector pin hole 2.

[0041] One end of the protective sleeve 6 protrudes outside the mold frame 1, providing operational space for assembly. It allows for quick replacement without disassembling the mold frame 1 or the ejector pin 5 system, significantly improving maintenance efficiency and reducing downtime and maintenance costs. Furthermore, this structure eliminates the need for a complete reconstruction of the mold frame 1; only local machining is required at the entrance section of the ejector pin hole 2. This makes it suitable for new mold integration designs and upgrades of existing molds, demonstrating excellent adaptability and engineering feasibility. In summary, this preferred structure, while ensuring the normal movement of the ejector pin 5, offers advantages such as a reasonable structure, ease of maintenance, and low modification threshold, making it particularly suitable for cooling systems in die-casting molds under high pressure and high humidity conditions.

[0042] In one embodiment, the outer peripheral wall of the protective sleeve 6 inserted into the ejector pin hole 2 is provided with an external thread 8, and the corresponding inner wall of the ejector pin hole 2 is provided with a matching internal thread. The protective sleeve 6 is threadedly connected to the internal thread in the ejector pin hole 2 through the external thread 8.

[0043] The protective sleeve 6 can be firmly fixed in the ejector pin hole 2 through the threaded connection, effectively resisting the vibration, impact and pressure of the cooling medium generated during the die casting process, preventing the protective sleeve 6 from loosening or axial displacement during use, and ensuring its long-term stable operation.

[0044] The threaded connection method is easy to operate, supports manual or tool-assisted installation, and provides accurate positioning, which helps improve assembly efficiency and consistency. In later maintenance, if the protective sleeve 6 shows wear or a decrease in sealing performance, it can be removed and replaced by rotation without disassembling the overall structure of the mold frame 1 or removing the ejector pin 5 system, which significantly improves maintenance convenience and reduces downtime and maintenance costs.

[0045] In addition, the threaded connection has good axial limiting and circumferential fixing capabilities, which helps to ensure the coaxiality of the installation of the protective sleeve 6, reduce the movement resistance of the ejector pin 5 or the problem of poor guidance caused by assembly deviation, and improve the reliability of mold operation.

[0046] In another embodiment, the portion of the protective sleeve 6 inserted into the ejector pin hole 2 is pressed in and fixed within the ejector pin hole 2 by an interference fit.

[0047] The interference fit utilizes the elastic deformation between the protective sleeve 6 and the wall of the ejector pin hole 2 to generate interfacial pressure, thereby achieving a firm connection. It can effectively resist the effects of vibration, impact load and cooling medium pressure during the die casting process, prevent the protective sleeve 6 from loosening or axial displacement, and ensure its stability during long-term operation.

[0048] This fixing method does not require additional machining of threads, pin holes or mounting slots on the protective sleeve 6 or mold frame 1, nor does it rely on fasteners such as screws and retaining rings. The structure is simple, reducing the number of parts and assembly steps. While ensuring connection strength, it reduces system complexity and avoids the risk of mold failure caused by fasteners falling off.

[0049] Under proper alignment and guidance, the protective sleeve 6 can be smoothly pressed in using pressure equipment, which helps maintain the coaxiality of its inner hole axis with the original ejector pin hole 2, providing stable and smooth motion guidance for the ejector pin 5, reducing frictional resistance and localized wear, and helping to extend the service life of the ejector pin 5 and key mold components. In mold areas where ejector pins 5 are densely arranged and space is limited, threaded connections are often difficult to implement due to a lack of operating space. However, interference fits can be installed in one go using automated press-fit equipment, with minimal impact on the surrounding structure, making it particularly suitable for compact or high-density mold structures. In summary, using an interference fit to fix the protective sleeve 6 offers advantages such as reliable connection, simple structure, no need for additional fasteners, and suitability for confined spaces. It is a preferred solution for high reliability requirements and complex operating conditions, especially suitable for die-casting mold cooling systems that require high long-term stability, assembly efficiency, and space utilization.

[0050] More preferably, the mold frame 1 is provided with a recessed cavity 9, and the water-proof structure includes a drainage trough 10 provided at the bottom of the recessed cavity 9. The drainage trough 10 is used to collect and drain the water accumulated in the recessed cavity 9.

[0051] In die-casting molds, the cavity 9 area is typically used to install or accommodate moving parts such as ejector pins 5 and sliders. If cooling water seeps out from the water channels 3, ejector pin holes 2, etc., and accumulates here, it can easily lead to corrosion of the metal surface, causing problems such as jamming of moving parts, accelerated wear, or lubrication failure. By setting a drainage groove 10 at the bottom of the cavity 9, the seeping water can be collected and directed out in a timely manner, effectively reducing the water retention time, keeping the area relatively dry, thereby significantly reducing the risk of electrochemical corrosion and extending the service life of the mold frame 1 and moving parts.

[0052] This design breaks through the traditional "blocking-oriented" approach to leak prevention, and adopts a proactive management strategy that combines "dredging and guiding". Even if there is a small amount of leakage, it can be controlled through a structured drainage path, preventing small leaks from developing into serious malfunctions and improving the mold's fault tolerance and operational stability under complex working conditions.

[0053] In summary, by setting a drainage trough 10 at the bottom of the cavity 9 of the mold frame 1, the leakage water can be effectively collected and directed for drainage, transforming passive protection into active management. This not only significantly enhances the mold's ability to cope with water leakage, but also improves operational safety and maintenance convenience. It is an optimized solution that is structurally reasonable, practical, efficient, and easy to implement.

[0054] More preferably, the drainage channel 10 is located at the junction of the bottom and side wall of the cavity 9, and the drainage channel 10 extends along the inner wall contour of the cavity 9 to form a surrounding flow path.

[0055] The drainage channel 10 is positioned at the junction of the bottom and sidewall of the recessed cavity 9, precisely at the point where the liquid has the lowest potential energy under gravity, serving as the natural path for leaking water to collect. This design efficiently captures cooling water flowing down from the sidewall or migrating to the bottom, effectively preventing localized water accumulation caused by structural dead corners and the resulting problems such as corrosion and lubrication failure. Simultaneously, the drainage channel 10 extends along the contour of the recessed cavity 9, comprehensively covering the source of seepage in the circumferential direction. This ensures that regardless of the location of the leak, water can be guided into the channel nearby, avoiding blind spots in drainage. This design is particularly suitable for recessed cavity 9 layouts with densely packed ejector pins 5 and complex structures.

[0056] To further facilitate the drainage of accumulated water, the mold frame 1 is provided with a through drainage hole 11, one end of which is connected to the drainage trough 10, and the other end extends to the outside of the mold frame 1, forming a complete drainage path of "water collection → flow guidance → drainage". Figure 4 As shown, the mold frame 1 is placed in this orientation when in operation. Under the action of gravity, the accumulated water flows along the wall of the mold frame 1 to the drainage channel 10 and is discharged out of the mold through the drainage hole 11, realizing dynamic drainage and source control.

[0057] To improve drainage efficiency, the mold frame 1 is provided with multiple drainage holes 11, which are distributed at intervals along the path of the drainage channel 10. The multi-hole design not only increases the total drainage cross-sectional area and reduces flow resistance, but also enables segmented diversion and balanced drainage, preventing water accumulation at distant ends. At the same time, the multiple drainage holes 11 form parallel channels, providing a certain degree of system redundancy. Even if individual holes fail due to blockage by impurities, the remaining holes can still maintain basic drainage functions, improving the reliability and fault tolerance of the system.

[0058] The drainage groove 10 and drainage hole 11 can be integrally formed with the mold frame 1 through milling or wire cutting processes, requiring no additional parts. This results in a simple structure, low cost, and convenient maintenance. The drainage system can operate stably for a long time, significantly reducing liquid accumulation inside the mold, lowering the risk of corrosion, and extending the service life of critical moving parts.

[0059] This solution also proposes a die-casting mold, including the aforementioned leak-proof structure for die-casting molds.

[0060] 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.

[0061] 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.

[0062] 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 leak-proof structure for a die-casting mold, the die-casting mold having a mold frame, wherein ejector pin holes and water channels are provided within the mold frame, water-cooling pipes are installed within the water channels, and ejector pins slide through the ejector pin holes, characterized in that... The leak-proof structure includes: A protective sleeve is inserted into the ejector pin hole and sleeved around the ejector pin. The protective sleeve has a through guide hole inside, and the ejector pin slides through the guide hole. When the ejector pin moves relative to the mold frame, the ejector pin slides along the guide hole to guide the movement of the ejector pin and form an isolation structure between the ejector pin and the mold frame.

2. The leak-proof structure for die-casting molds as described in claim 1, characterized in that, The protective sleeve is disposed at one end of the ejector pin hole near the outer side of the mold frame. One end of the protective sleeve is inserted into the ejector pin hole, and the other end extends to the outside of the mold frame. The length of the protective sleeve is less than the axial length of the ejector pin hole.

3. The leak-proof structure for die-casting molds as described in claim 2, characterized in that, The protective sleeve has an external thread on its outer peripheral wall that is inserted into the ejector pin hole, and the corresponding section of the inner wall of the ejector pin hole has a matching internal thread. The protective sleeve is threadedly connected to the internal thread in the ejector pin hole through the external thread.

4. The leak-proof structure for die-casting molds as described in claim 2, characterized in that, The portion of the protective sleeve inserted into the ejector pin hole is pressed in and fixed within the ejector pin hole by an interference fit.

5. The leak-proof structure for die-casting molds as described in claim 1, characterized in that, The mold frame is provided with a recessed cavity, and the water-proof structure includes a drainage trough at the bottom of the recessed cavity, which is used to collect and drain the water accumulated in the recessed cavity.

6. The leak-proof structure for die-casting molds as described in claim 5, characterized in that, The drainage channel is located at the junction of the bottom of the cavity and the side wall of the cavity.

7. The leak-proof structure for die-casting molds as described in claim 6, characterized in that, The drainage channel extends along the contour of the inner wall of the cavity.

8. The leak-proof structure for die-casting molds as described in claim 5, characterized in that, It also includes a drainage hole that penetrates the mold frame. One end of the drainage hole is connected to the drainage channel, and the other end extends to the outside of the mold frame, so as to allow the water accumulated in the drainage channel to drain out of the mold frame.

9. The leak-proof structure for die-casting molds as described in claim 8, characterized in that, The mold frame is provided with a plurality of drainage holes, which are distributed at intervals along the path of the drainage channel.

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

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