Die casting mold, hot chamber system, method for die casting of metal and use of a die casting mold

Abstract

A diecasting mold, comprising a first mold plate which is hot in operation and comprising at least one diecasting nozzle with an outlet point for a melt, and a second mold plate which forms a cold side. A mold cavity is formed between the first and second mold plates in a closed state of the diecasting mold, in which mold cavity a molded part can be produced from solidified melt introduced into the mold cavity via at least one melt channel, at least one diecasting nozzle and the at least one gate. The diecasting mold further comprises a demolding system, the demolding system comprising an ejector assembly, a drive device, and a force transmission device. A hot chamber system for diecasting metal melt according to the hot chamber method is also taught, a method for diecasting metal, and a use of a diecasting mold.

Description

DIE CASTING MOLD, HOT CHAMBER SYSTEM, METHOD FOR DIE CASTING METALS AND USE OF A DIE-CASTING MOLD FIELD OF INVENTION The invention relates to a die-casting mold comprising a first hot-working mold plate having at least one die-casting nozzle with an outlet for a molten mass, and a second mold plate forming a cold side. A mold cavity is formed between the first and second mold plates in a closed state of the die-casting mold. In this mold cavity, a molded part can be produced from the solidified molten mass introduced into the mold cavity through at least one molten mass channel and the at least one die-casting nozzle. The die-casting mold further comprises a demolding system for removing the molded part from the die-casting mold. The demolding system comprises an ejector assembly, a drive device, and a power transmission device connected to the drive device and the ejector assembly.The power transmission device serves to transmit driving forces to the ejector assembly. The invention further relates to a hot chamber system for pressure melting molten metals according to a hot chamber method in which the molten metal is maintained in a liquid state at an outlet point of a die-casting nozzle that opens into a die-casting mold. The hot chamber system comprises a hot chamber die-casting machine with a melting vessel and a machine nozzle, through which the molten metal reaches the die-casting nozzle via a molten metal channel, in which a plug of solidified molten metal that interrupts the flow of molten metal may form at an outlet point of the die-casting nozzle. The invention also relates to a method for pressure melting metal provided in the form of a molten metal, and to the use of a die-casting mold. The exit point is the region of the die casting nozzle from which the molten material emerges during the casting process and where the sprue is formed, to which one or more cast parts are attached. In the case of die casting without a sprue, where only one cast part is formed at a time in front of the die casting nozzle, the sprue is located directly on the cast part and is not detached. Therefore, this side of the die casting mold, which is the hot mold plate, is also called the access side. BACKGROUND OF THE INVENTION The parts of a typical permanent mold according to prior art as used for die casting include the following: - platinum, - first mold plate, access side, - second mold plate, ejection side (opposite the access side), the mold cavity being formed between the first mold plate and the second mold plate in the closed state of the die-casting mold, - spacer bars for the ejector plates, - ejector plates with ejector pistons, - platinum, - connections for cooling holes, as well as - hot runner or cold runner nozzle. The demolding system, also known as the unloading unit or ejector, is used to remove a casting from a mold cavity. The demolding system essentially consists of the ejector pressure plate, the ejector holding plate, and a series of ejectors, usually round, mostly ejector pins or sleeves, the number of which depends on the contour of the casting. The ejectors, held in place on the ejector holding plate by a collar, are then pushed forward by a drive device, typically an ejector pin, and the ejector plate to eject the casting from the die-casting mold, i.e., its mold cavity. For more complex casting contours, the demolding system may also include more sophisticated features such as angled ejectors, contour ejectors, or flat ejectors.The demolding system is usually protected by limit switches or reset pins that force the ejector pack back when the tool is closed, if it has not been previously retracted in the event of a failure, to prevent errors in the program sequence and associated damage to valuable molding components. The ejector pressure plate is always designed to be stronger than the ejector clamping plate, because it serves to transmit force and transmits the ejection force from the drive device, conventionally an ejector rod driven from outside the die-casting mold, to the ejectors. Die-cast metal components are often used when the final products in which they are incorporated require a high-end appearance. Particular emphasis is placed on the visual finish and the tactile feel of the visible surfaces. Such items are usually subsequently finished with various chemical surface processes. Numerous electrodeposition and polymer-based coatings are available for this purpose. However, all these processes place specific demands on the casting quality of the cast items—that is, the resulting surfaces. Numerous applications can be cited as examples, such as in the fields of furniture, sanitary ware, and vehicle interiors. Both the porosity of the molded parts, also called castings, and surface inclusions have a very negative effect on the final surface. Furthermore, surface marks, such as those caused by ejectors, are undesirable. Currently, the surface formed by the first mold plate has marks from the access hole, and the surface formed by the second mold plate has marks from the ejectors. As a result, it is impossible to form either side with a perfectly smooth and undisturbed surface. In die casting practice, there has been no need to place the demolding system, also known as the ejector unit, on the fixed hot side of the die casting mold, also known as the access side or sprue side. A direct connection of the molded parts to the access side, without subsequent removal of the sprue as a byproduct of casting and the corresponding surface finishing, was originally not possible due to the lack of a suitable hot runner method. However, prior art die-casting methods are known that make this possible and describe sprueless die-casting. Based on documents WO 2012 / 076008 A2, WO 2013 / 071926 A2, and WO 2017 / 148457 A1, die-casting methods and die-casting nozzle systems are known for use in a hot chamber system for die-casting molten metals. In each of these methods, a plug of solidified molten metal, which interrupts the flow of the molten metal, can be formed directly at the access point on the surface of the subsequent casting. Only the use of the aforementioned methods allows for direct connection to the casting and, in addition to saving material and energy, a significant increase in casting quality.Direct connection eliminates the sprue as a byproduct of casting, which in conventional die-casting methods solidifies in the channels between the die-casting nozzle and the die-casting mold, bonding the castings together after demolding in an undesirable way and having to be removed at great cost. However, in prior art methods, even without removing the sprue, impressions of the nozzles—the now minimized sprue area—are produced on the surface of the casting on the hot side of the die-casting mold. Simultaneously, marks are created on the opposite side of the casting, formed by the cold side of the mold with the ejectors located there. As a result, a high-quality surface finish cannot be produced using only the casting method. Therefore, an object of the present invention is to provide a die-casting mold, a heated chamber system, a method for die-casting metals, and a use of a die-casting mold to produce a casting with a high-quality surface finish that can be immediately further processed on one side without production-related surface disturbances due to the ejectors. BRIEF DESCRIPTION OF THE INVENTION The objective is achieved by means of a die-casting mold, comprising a first hot-working mold plate having at least one die-casting nozzle with an outlet for molten material, and a second mold plate forming a cold side. A mold cavity is formed between the first and second mold plates in a closed state of the die-casting mold when the first and second mold plates are in close contact with each other. Within this mold cavity, a cast part can be produced from solidified molten material introduced into the mold cavity through at least one molten channel and the at least one die-casting nozzle. The die-casting mold further comprises a demolding system for removing the cast part from the die-casting mold.The demolding system has an ejector assembly, preferably comprising ejector pins or an ejector sleeve, each of which is attached to an ejector clamping plate. An ejector pressure plate transmits force to the ejector assembly when the cooled molded part is ejected. Therefore, the demolding system has an ejector assembly, a drive device, and a power transmission device connected to the drive device and the ejector assembly. According to the invention, the demolding system is arranged, particularly with peripheral drive, outside the area of ​​at least one melt channel and at least one die-casting nozzle. Specifically, the drive device has a temperature resistance that allows for its placement on the first mold plate. The first mold plate is heated by the incoming melt or must be at a sufficiently high temperature to allow the melt to enter the mold cavity at the required temperature. The temperature of the first mold plate depends on the temperature of the melt. Therefore, the temperature resistance of the drive device must be guaranteed up to, for example, 300°C. In an advantageous embodiment of the invention, the drive device of the demolding system is arranged peripherally on the first mold plate, and at least two linear drives are arranged outside the region of the at least one melt channel, the at least one die-casting nozzle and its outlet point. According to an additional advantageous embodiment, the linear drives are configured as hydraulic drives, each comprising a hydraulic cylinder on both sides of the melt channel and die-casting nozzle region. Alternatively, pneumatic or electric linear drives, screw drives, or other suitable embodiments may be used. A particularly preferred hydraulic cylinder is high-temperature resistant and can withstand temperatures up to 300 °C. For example, it applies a force of 5 kN at 160 bar, with a maximum pressure of pmax = 220 bar. The required temperature resistance of up to 300 °C also applies equally to the other drive systems intended for use. The temperature specification is by way of example, as the actual melt temperature ultimately determines the requirements. It has been shown to be advantageous if the ejector assembly comprises discrete-action ejector pins and / or is configured as an annular sleeve ejector around the die-cast nozzle's exit point. Both the ejector pins and the sleeve ejector can be equipped with a protective gas connection, an internal protective gas line, and a protective gas outlet. At least one protective gas outlet, such as a protective gas nozzle, has proven advantageous for supplying a protective gas to the mold cavity during demolding. The main advantage is particularly evident when using flammable molten metals, such as magnesium. Magnesium can oxidize rapidly and burn, which can occur especially during demolding when residual liquid magnesium escapes from the die-casting nozzle. While the newly formed casting is in the mold cavity, the exit point of the die-casting nozzle is sealed by the solidified molten metal, and heat dissipation through the casting prevents the sprue from melting. However, during demolding, when the casting is ejected from the hot side by the ejectors, the condition at the exit point, behind which the liquid molten metal is held in the nozzle for the next casting operation, becomes unstable. The sprue, sealed by a plug of molten metal (the residue from the sprue that does not adhere to the casting), can rupture, allowing liquid molten metal to escape. Oxidation then occurs between the molten metal and the oxygen in the ambient air. This happens in a highly exothermic manner in critical molten metals, especially magnesium, and can trigger a fire. Even if a large fire does not occur, rust can form, especially in the area of ​​the die-casting nozzle exit point, and damage the mold or nozzle. Using shielding gas during ejection can prevent fires and damage to the die-casting mold and nozzle at the potential point of origin. Advantageously, the shielding gas flows directly from the ejector assembly, as the latter is located directly in the mold cavity and is substantially involved in the ejection of the molded part. A shielding gas outlet located further away, for example, next to the mold cavity, would be less effective, since in this case the shielding gas would first have to reach the mold cavity and would also have to be supplied in larger quantities. Compared to an alternative shielding gas outlet in the mold cavity region, which would involve additional disturbance to the surface of the die-casting mold and the molded part, using the ejector assembly to carry the shielding gas within it to the shielding gas outlet and the specific application offers an elegant solution. Therefore, the at least one protective gas outlet is particularly preferentially arranged in the ejector assembly, which, during ejection of the molded part, enters directly into the mold cavity, specifically at the nozzle exit point—the source of the oxidation. In this context, particular advantages arise from a modified arrangement in which the at least one protective gas outlet is located in the ejector wall, for example, inside the wall of a sleeve ejector facing the die-casting nozzle exit point. As a result, the protective gas is directed straight to the nozzle exit point, where there is a particular risk of oxidation or fire when using critical molten materials, and the sleeve ejector retains it in this region like a skirt. This results in high efficiency and low gas consumption. According to a particularly advantageous design, the protective gas outlet is located in a region that only emerges from the first mold plate during ejection, so that the protective gas outlet is only unblocked during ejection. This keeps the protective gas outlet covered, sealed, and protected during the casting process. As a result, it also prevents it from causing additional surface disturbances. Multiple protective gas outlets are preferably arranged around the circumference of the ejector pin wall or the sleeve ejector to ensure that sufficient protective gas is supplied. Any gas that can prevent oxidation and keep oxygen out of the ambient air can be used as a shielding gas. However, nitrogen has proven advantageous as a shielding gas because it is readily available, a harmless major component of ambient air, and requires no additional safety precautions. Advantageously, particularly for installation and maintenance, the demolding system is accessible through the mold cavity side of the first mold plate when the die-casting mold is open. The object of the invention is also achieved by means of a hot chamber system for hot chamber die casting of molten metal, in which the molten metal is maintained in a liquid state at the outlet of a die-casting nozzle leading into a die-casting mold. The hot chamber system comprises a hot chamber die-casting machine with a casting vessel and a machine nozzle through which the molten metal enters a die-casting mold. A plug of solidified molten metal may form, interrupting the flow of molten metal at the outlet of the die-casting nozzle. The hot chamber system further comprises at least one molten metal channel joined at a heating zone and a nozzle tip, which preferably form part of or are integrated into the die-casting nozzle, connected to an access region of the die-casting mold.According to the invention, the die-casting mold is configured as a die-casting mold with a demolding system as described above. The object of the invention is further achieved by means of a method for die-casting metal provided as a molten mass. According to the solution of the invention, in a die-casting mold with a demolding system as described above, the following steps are performed: a. close the mold by moving the first and second mold plates together and (in)closing the mold cavity, b. Introduce the molten mass from the outlet point of the die-casting nozzle into the mold cavity from the first mold plate, which forms the access side and has the access, c. cool and solidify the molten mass to form the molded piece, d. Open the mold by lifting the second mold plate from the first plate and releasing the molded part, e. Activate the demolding system, which is also located on the first mold plate, f. eject the molded part by releasing its adhesive connection with the first mold plate through the demolding system. Steps d) and e) can be performed simultaneously, especially if the die-casting mold opening process is mechanically coupled to the demolding system and the ejectors simultaneously eject the molded part. Alternatively, a separate actuator can activate the demolding system as required, for example, after the molded part has been picked up by a manipulator. According to an advantageous configuration of the method, a shielding gas that keeps atmospheric oxygen away flows into the mold cavity and to the die-casting nozzle exit point during the release of the cast part. This is particularly advantageous for castings that have an inherent risk of severe oxidation and ignition. This applies especially to magnesium, the processing of which is associated with a high risk of fire. The use of shielding gas during ejection can prevent a fire at the potential point of origin. Advantageously, the shielding gas flows outside the ejector assembly, since the latter is located directly in the mold cavity and is substantially involved in ejecting the molded part. Furthermore, using nitrogen as the shielding gas has proven advantageous, as it is a harmless major component of ambient air and therefore requires no additional safety precautions. The objective is further achieved by using a die-casting mold as described above with the demolding system, configured as a die-casting mold for pressure-casting a molten mass of metal according to the hot chamber method, in which the molten mass is kept in a liquid state at an outlet point of the die-casting nozzle. With the development and integration of the demolding system or ejector assembly into the first mold plate, the hot side of the die-casting mold, as part of the hot runner system, ensures that both surface quality and the integrity of the visible surface remain unaffected by the nozzles or ejectors. Complex processing steps, such as grinding visible surfaces or sprue edges, are no longer required. Surface defects, a major problem in any foundry, are significantly reduced. As a result, profitability increases. There is no need to sort the produced molded parts according to defects, a time-consuming process that typically only becomes apparent after coating and ultimately leads to the scrapping of parts lacking sufficient surface quality. By utilizing known prior art die-casting nozzles, which provide direct access to the mold cavity or the casting, the present invention can be used to produce a casting that requires no further processing. The present invention also enables the side of the casting opposite the access point to be produced without surface damage from ejector marks. Instead, these marks are relocated to the opposite side, where the casting is affected by the access point. This results in a completely intact surface that meets the highest requirements and can be used or finished without further processing. BRIEF DESCRIPTION OF THE FIGURES The invention is explained in more detail below by means of a description of exemplary embodiments and their representation in the corresponding drawings. In the drawings: Fig. 1 schematically shows a cross-sectional view of one modality of a die-casting mold according to the invention; Fig. 2 schematically shows a cross-sectional view of one modality of a die-casting mold according to the invention during the formation of a molded part in the casting process; Fig. 3 schematically shows a cross-sectional view of one embodiment of a die-casting mold according to the invention during the ejection of a molded part after the casting process; and Fig. 4 shows a detail of a cross-sectional view of a modality of a die-casting mold according to the invention during the ejection of a molded part. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION Figure 1 schematically shows a cross-sectional view of one embodiment of a die-casting mold 10 according to the invention, comprising two die-casting nozzles 6, the outlet 17 of which opens into a mold cavity 14. A molded part 16 (see Figures 2 and 3) can be produced in the mold cavity 14 (in the lower side of the die-casting mold 10 or the first mold plate 11, not shown). The die-casting mold 10 is part of a heated chamber system 1, of which only a section is shown. Besides the die-casting mold 10 and the machine nozzle 2, which are partially shown, the system also comprises a casting vessel (not shown) from which the molten mass 8 passes through the machine nozzle 2 into the die-casting mold 10. Only the first mold plate 11 of the die-casting mold 10 is shown. The second mold plate, not shown, is attached to the mold cavity side region 15 when the die-casting mold 10 is closed. It moves upward toward the first mold plate 11 before the casting process so that the complete mold cavities 14 are formed, and it moves away to open the die-casting mold 10 to remove the cast part 16. The second mold plate has only cavities and is otherwise free of internal or functional elements, which is why the second mold plate is not shown for clarity. Each of the mold cavities 14 is accessible by means of a demolding system 20, namely by means of ejector pins 28 on the left side or an ejector sleeve 30 on the right side of the figure, for demolding the molded part 16 from the first mold plate 11. The ejection system 20 is accessible through one side of the mold cavity 15 of the first mold plate 11 and comprises two drive devices 21, each of which, in the embodiment shown, is equipped with a hydraulic cylinder 22, the piston rods of which are connected to an ejector pressure plate 24. The ejector pressure plate 24 is used to transmit the drive forces of the piston rod 23 to the ejector pins 28 or the ejector sleeve 30. The ejector pins 28 and the ejector sleeve 30 are secured in an ejector clamping plate 26.For axial guidance of the ejector sleeve 30, the die-cast nozzle 6 shown on the right is further surrounded by an unspecified guide sleeve and a guide plate, while the ejector pins 28 are axially guided in the guide plate. The ejector pins 28 are also guided in the guide plate. The hydraulic cylinders 22 are located outside the region where the machine nozzle 2 is attached, the melt channels 4 run, and the die-casting nozzle 6 is located. This is a departure from the conventional central drive of the demolding system via a central ejector pin, as known in the prior art. It has been shown that the decentralized drive device 21 for generating the demolding force, which is divided among several hydraulic cylinders 22, allows the entire demolding system 20 to be arranged on the first mold plate 11, with the advantages mentioned in the description. Because high temperatures of several hundred degrees (100°) are produced in the first mold plate 11, particularly during die casting due to the molten metal used in this process, the hydraulic cylinder 22 is configured to be temperature stable and withstand the temperatures in the first mold plate 11, which depend on the respective temperature of the molten mass and therefore have different requirements. Figure 2 schematically shows a cross-sectional view of one embodiment of a die-casting mold 10 according to the invention with a portion of the heated chamber system 1 (see description in Figure 1) during the formation of the molded part 16 in the casting process. The flow of molten metal during the casting process is visualized by thick white arrows. In this process, the molten metal 8 flows from the machine nozzle 2, which is partially shown with its attachment to the die-casting mold 10, through the molten metal channels 4 to the die-casting nozzles 6. From its exit point 17, the molten mass 8 enters the mold cavity 14, which is formed between the first mold plate 11 and the second mold plate, not shown, which is in direct contact with the first mold plate 11 when the die-casting mold 10 is closed. This is where the molded part 16 is formed when the molten mass 8 that has entered the mold cavity 14 cools. Fig. 3 schematically shows a cross-sectional view of one embodiment of a die-casting mold 10 according to the invention with a portion of the hot chamber system 1 (see description of Fig. 1) during the ejection of the molded part 16 formed from the molten mass 8 that has cooled after its entry into the mold cavity 14. For ejection, the demolding system 20 is driven by the drive device 21 with the hydraulic cylinder 22, which pushes the piston rods 23 in the direction of the arrow away from the first mold plate 11 (downwards in the illustration). This also causes the ejector pressure plate 24, ejector clamping plate 26, ejector pins 28, and ejector sleeve 30 to move out of the die-casting mold 10 on the side of the mold cavity 15 and into the mold cavity 14. The casting 16, which is attached to the mold cavity 14, is thus released from the mold cavity 14, and the casting process is completed with the ejection of the casting 16. During ejection, a protective gas connection 36 introduces protective gas, such as nitrogen, into a protective gas line 34 within the ejector sleeve 30, as well as the ejector pins 28, which are not shown as including this equipment.This protective gas exits from protective gas outlet 32 ​​and enters the mold cavity region 14 (see Fig. 4). Subsequently, the demolding system 20 returns to its initial position, in particular the ejector assembly 28, 30 retracts, so that a new molding process can begin after the closing of the die-casting mold 10, during which the second mold plate, which is not shown, comes back into contact with the first mold plate 11. Fig. 4 shows detail A of a cross-sectional view of one embodiment of a die-casting mold 10 according to the invention during the ejection of a molded part 16. The protective gas outlet 32 ​​is shown unblocked, so that the protective gas, which flows through the protective gas line inside the ejector wall 31 towards the protective gas outlet 32, can escape. List of reference numbers for hot runner system (detail): machine nozzle, molten channel, die casting nozzle, molten material, die casting molds, first mold plate, mold cavity access, mold cavity side, molded part, exit point, demolding system, drive device, hydraulic cylinder, piston rod, force transmission device; ejector pressure plate, ejector clamping plate, ejector assembly, ejector pin, ejector assembly, ejector sleeve, ejector wall, protective gas outlet, protective gas line, protective gas connection

Claims

1. A die-casting mold (10), comprising a first hot-running mold plate (11) having at least one die-casting nozzle (6) with an outlet (17) for a molten mass, and a second mold plate forming a cold side, a mold cavity (14) being formed between the first and second mold plates in a closed state of the die-casting mold (10), in which mold cavity a molded part (16) can be produced from solidified molten mass (8) introduced into the mold cavity (14) through at least one molten mass channel (4) and the at least one die-casting nozzle (6), the die-casting mold (10) further comprising a demolding system (20) for demolding the molded part (16) from the die-casting mold (10), the demolding system (20) comprising an ejector assembly (28, 30),a drive device (21) and a force transmission device (30) connected to the drive device (21) and to the ejector assembly (28, 30), characterized in that the demolding system (20) is arranged outside the area of ​​at least one melt channel (4) and at least one die-casting nozzle (6) and has a temperature resistance for arrangement in the first mold plate (11).

2. The die-casting mold according to claim 1, characterized in that the drive device (21) is arranged peripherally on the first mold plate (11), is configured as at least two linear drives and these are arranged outside the region of at least one melt channel (4) and the at least one die-casting nozzle (6).

3. The die-casting mold according to claim 2, characterized in that the linear drives are configured as hydraulic drives, each comprising a hydraulic cylinder (22).

4. The die-casting mold according to any of the preceding claims, further characterized in that at least one protective gas outlet (32) is provided to supply a protective gas to the mold cavity (14) towards the outlet point (17).

5. The die-casting mold according to claim 4, characterized in that at least one protective gas outlet (32) is arranged in the ejector assembly (28, 30).

6. The die-casting mold according to claim 5, characterized in that the at least one protective gas outlet (32) is arranged in the wall of the ejector (31) in a region that emerges from the first mold plate (11) during ejection, such that the protective gas outlet (32) is unblocked during ejection.

7. The die-casting mold according to any of the preceding claims, characterized in that the arrangement of the ejector assembly comprises ejector pins (28) that act discretely and / or is configured as an ejector sleeve (30) in an annular shape around the exit point (17) of the die-casting mold (6).

8. The die-casting mold according to any of the preceding claims, characterized in that the demolding system (20) is accessible through one side of the mold cavity (15) of the first mold plate (11).

9. A hot chamber system (1) for pressure melting molten metal (8) according to a hot chamber method, wherein the molten metal (8) is maintained in a liquid state at an outlet point (17) of a die-casting nozzle (6) opening into a die-casting mold (10), the hot chamber system (1) comprising a hot chamber die-casting machine with a casting vessel and a machine nozzle (2), through which the molten metal (8) reaches the die-casting nozzle (6) via a molten metal channel (4), in which a plug of solidified molten metal (8) can be formed interrupting a flow of molten metal at an outlet point (17) of the die-casting nozzle (6), characterized in that the die-casting mold (10) is configured as claimed in any one of claims 1 to 8.

10. A method for die-casting metal provided as a molten mass, characterized in that, in a die-casting mold (10) as claimed in any one of claims 1 to 8, the method comprises performing the steps of: a. closing the die-casting mold (10) by moving the first mold plate (11) and the second mold plate together and closing the mold cavity (14), b. introducing the molten mass (8) from an outlet (17) of the die-casting nozzle (6) into the mold cavity (14) from the first mold plate (11), which forms the gate side and has the outlet point (17), c. cooling and solidifying the molten mass (8) to form the cast part (16), d. opening the die-casting mold (10) by lifting the second mold plate from the first mold plate (11) and releasing the cast part (16) on one side, e. activate the demolding system (20), f.eject the molded part (16) releasing the adhesive connection with the mold cavity (14) in the first mold plate (11) by the effect of the force of the demolding system (20).

11. The method according to claim 10, characterized in that a protective gas flows into the mold cavity (14) during the release of the molded part (16).

12. The method according to claim 11, characterized in that the protective gas protects an outlet point (17) of the die-cast nozzle (6) from the oxygen inlet.

13. The method according to claim 11 or 12, characterized in that the protective gas flows out of the ejector assembly (28, 30).

14. The method according to any of claims 11 to 13, characterized in that nitrogen is used as the shielding gas.

15. Use of a die casting mold (10) as claimed in any of claims 1 to 8, configured as a die casting mold (10), for die casting molten metal (8) according to the hot chamber method, wherein the molten metal (8) is kept in a liquid state at an outlet point (17) of the die casting nozzle (6).