Metallurgical mold, metallurgical equipment and metal part injection molding method

Abstract

The present application discloses a metallurgical mold, metallurgical equipment and a method for injection molding of metal parts. The metallurgical mold of the present application is used for injection molding of metal parts with irregular shapes, and includes a first mold and a second mold. The shaping cavity of the first mold corresponds to the outer surface of the metal part, and the second mold is arranged corresponding to the through groove of the metal part, and the melting point of the second mold is lower than the melting point of the metal part. The relative position of the second mold and the wall of the shaping cavity corresponds to the relative position of the through groove of the metal part and the outer surface of the metal part. Furthermore, after the powder metallurgy material is injection molded, the required metal part can be formed; and because the melting point of the second mold is lower than the melting point of the metal part, the second mold can be detached from the metal part based on the difference between the melting point of the second mold and the melting point of the metal part, reducing the difficulty of detaching the second mold from the metal part, ensuring the aesthetics of the molded metal part, improving the efficiency of injection molding of metal parts with irregular shapes, and enhancing the user's experience of using the metallurgical mold.

Description

Technical Field

[0001] The present application relates to the technical field of special-shaped metal injection molding, and in particular to a metallurgical mold, metallurgical equipment and a method for injecting metal parts. Background Art

[0002] In the prior art, for the injection molding of powder metallurgy parts with irregular inner holes, since the mold core rod of the inner hole is not easy to be pulled out after injection molding, the inner hole powder metallurgy parts are generally injection molded by double-sided mold injection sintering. Specifically, the metallurgical parts are split into multiple parts, each part is injection molded separately, and then the formed multiple parts of the metallurgical parts are connected together, but traces will remain at the connection of the metallurgical parts, that is, cracks will appear on the surface of the metallurgical parts, reducing the aesthetics of the metallurgical parts and failing to meet the needs of users. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a metallurgical mold for injection molding a metal part, wherein the metal part is provided with a through groove, and the shape of the metal part is irregular. The metallurgical mold comprises:

[0004] A first mold having a shaping cavity, wherein the shaping cavity corresponds to the outer surface of the metal part;

[0005] a second mold, arranged corresponding to the through groove of the metal part, wherein the melting point of the second mold is lower than the melting point of the metal part;

[0006] In the process of injecting powder metallurgy material into the shaping cavity, the second mold is arranged in the shaping cavity, and the relative position between the second mold and the cavity wall of the shaping cavity corresponds to the relative position between the through groove of the metal part and the outer surface of the metal part.

[0007] The first mold is provided with a first injection port and a second injection port, the first injection port and the second injection port are respectively connected to the shaping cavity, and the first injection port is arranged at a first cavity wall of the shaping cavity, and the second injection port is arranged at a second cavity wall of the shaping cavity, the first injection port and the second injection port are arranged correspondingly, and the first cavity wall and the second cavity wall are two opposite cavity walls in the shaping cavity;

[0008] The second mold is located in the molding cavity, and the first injection port and the second injection port are located on opposite sides of the second mold.

[0009] Among them, the volume of the shaping cavity on the first side of the first injection port is equal to the volume of the shaping cavity on the second side of the first injection port; the first side of the first injection port and the second side of the first injection port are two opposite sides of the first injection port.

[0010] The surface length of the second mold near the first injection port is smaller than the surface length of the second mold near the second injection port, and the diameter of the first injection port is smaller than the diameter of the second injection port.

[0011] The first mold includes a first mold core and a second mold core, the surface of the first mold core close to the second mold core corresponds to a portion of the outer surface of the metal part, the surface of the second mold core close to the first mold core corresponds to a portion of the outer surface of the metal part, and the first mold core and the second mold core are attached to form the shaping cavity;

[0012] The first mold core and the second mold core are spaced apart in a height direction of the metallurgical mold, and the first injection port and the second injection port are arranged on the second mold core.

[0013] Wherein, the temperature of the powder metallurgy material injected into the shaping cavity is 180°C to 200°C.

[0014] In order to solve the above technical problems, the present application also provides a metallurgical equipment, including the metallurgical mold and an injection device as described above, wherein the injection device is spaced apart from the metallurgical mold and is used to inject powder metallurgy material into the shaping cavity of the metallurgical mold.

[0015] Among them, the metallurgical equipment also includes a first heating device and a second heating device, the first heating device is arranged on the injection device, and is used to heat the powder metallurgy material loaded in the injection device; the second heating device is spaced apart from the metallurgical mold, and is used to heat the first mold.

[0016] In order to solve the above technical problems, the present application also provides a method for injection molding of a metal part, which is applied to the metallurgical mold as described above, and / or the metallurgical equipment as described above, and the injection molding method comprises:

[0017] Placing the second mold between the first mold core and the second mold core, and fitting the first mold core and the second mold core together;

[0018] Powder metallurgy material is injected into the shaping cavity formed by the first mold core and the second mold core through the first injection port and the second injection port, so that the powder metallurgy material injected into the shaping cavity forms a desired metal part.

[0019] Wherein, after the powder metallurgy material is injected into the molding cavity and formed, the injection molding method further comprises:

[0020] Separating the first mold core and the second mold core, and separating the formed metal blank from the first mold, wherein the second mold is located in the metal blank;

[0021] The metal blank is subjected to a sintering operation to remove the second mold in the metal blank to obtain the metal part.

[0022] Beneficial effects of the present application: Different from the prior art, the metallurgical mold of the present application is used for injection molding of irregularly shaped metal parts, including a first mold and a second mold, the first mold has a shaping cavity, the shaping cavity corresponds to the outer surface of the metal part, the second mold is arranged corresponding to the through groove of the metal part, and the melting point of the second mold is lower than the melting point of the metal part. In the process of injecting the powder metallurgy material into the shaping cavity, the second mold is arranged in the shaping cavity, and the relative position of the second mold and the cavity wall of the shaping cavity corresponds to the relative position of the through groove of the metal part and the outer surface of the metal part. Furthermore, after the powder metallurgy material is injection molded, the required appearance and through groove of the metal part can be formed; and because the melting point of the second mold is lower than the melting point of the metal part, the second mold can be detached from the metal part based on the difference between the melting point of the second mold and the melting point of the metal part, reducing the difficulty of detaching the second mold from the metal part, ensuring the aesthetics of the molded metal part, improving the efficiency of injection molding of irregularly shaped metal parts, and enhancing the user's experience of using the metallurgical mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] in:

[0025] Figure 1 It is a structural schematic diagram of an embodiment of a metallurgical mold of the present application;

[0026] Figure 2 It is a structural schematic diagram of a second mold embodiment of the present application;

[0027] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle area A;

[0028] Figure 4 yes Figure 1 A schematic diagram of the structure of the middle area A from another perspective;

[0029] Figure 5 It is a schematic diagram of the process of an embodiment of the injection molding method of the present application.

[0030] Reference numerals: metallurgical mold 1; first mold 11; second mold 12; first injection port 13; second injection port 14; metal part 2. DETAILED DESCRIPTION

[0031] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0032] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0033] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, and can mean including any one or more elements selected from the set consisting of A, B, and C. In addition, the terms "first", "second", and "third" in this application are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0035] See also Figure 1 , Figure 1 to Figure 3 , Figure 1 It is a structural schematic diagram of an embodiment of a metallurgical mold of the present application; Figure 2 It is a structural schematic diagram of a second mold embodiment of the present application; Figure 3 yes Figure 1 The metallurgical mold 1 provided in the embodiment of the present application is used for injection molding a metal part 2 , the metal part 2 is provided with a through groove, and the shape of the metal part 2 is irregular, and the metallurgical mold 1 includes a first mold 11 and a second mold 12 .

[0036] The first mold 11 has a shaping cavity, which corresponds to the outer surface of the metal part 2, and the desired outer surface can be formed after the metal metallurgical material is injected into the shaping cavity. The second mold 12 is set corresponding to the through groove of the metal part 2, and the melting point of the second mold 12 is lower than the melting point of the metal part 2.

[0037] Specifically, in the process of injecting the powder metallurgy material into the molding cavity, the second mold 12 is disposed in the molding cavity, and the relative position between the second mold 12 and the cavity wall of the molding cavity corresponds to the relative position between the through groove of the metal component 2 and the outer surface of the metal component 2. The metal component 2 formed by injecting the powder metallurgy material into the molding cavity has the required outer surface and the required through groove, thereby improving the injection molding efficiency of the metallurgical mold 1 on the metal component 2.

[0038] After the metal part 2 is detached from the first mold 11, the second mold 12 is also arranged in the through groove of the metal part 2. Furthermore, since the melting point of the second mold 12 is lower than the melting point of the metal part 2, in the process of detaching the metal part 2 from the metallurgical mold 1, the melting point difference between the second mold 12 and the metal part 2 can be utilized to detach the second mold 12 from the metal part 2. For example, the metal part 2 and the second mold 12 arranged between the metal parts 2 are sintered at a temperature between the melting point of the metal part 2 and the melting point of the second mold 12 to melt the second mold 12 without affecting the shape of the metal part 2, and the second mold 12 is detached from the metal part 2, thereby reducing the difficulty of detaching the second mold 12 from the metal part 2, improving the aesthetics of the injection-molded metal part 2, improving the practicality of the metallurgical mold 1, and enhancing the user's experience of using the metallurgical mold 1.

[0039] The powder metallurgy material may be a mixture of powder particles (such as copper particles, alloy particles, etc.) of the metal material for the metal part 2 and a binder. The second mold 12 may be a plastic product (such as a POM (polyoxymethylene) product) or a product of other materials with a lower melting point.

[0040] In summary, in the metallurgical mold 1 of the embodiment of the present application, the through groove of the metal part 2 is shaped by setting a second mold 12 whose melting point is lower than the melting point of the metal part 2. After the metal part 2 is injection molded, the second mold 12 can be detached from the metal part 2 by utilizing the melting point relationship, thereby reducing the difficulty of detaching the second mold 12 from the metal part 2, improving the aesthetics of the injection-molded metal part 2, improving the practicality of the metallurgical mold 1, and enhancing the user's experience of using the metallurgical mold 1.

[0041] In actual applications, after the metal part 2 is separated from the first mold 11, necessary sintering operations are required to remove the binder components in the formed metal part 2 and improve the strength of the metal part 2. Therefore, the operation of separating the second mold 12 from the metal part 2 can be performed simultaneously with the operation of removing the binder from the metal part 2. That is, the user does not need to set up additional devices or add steps to separate the second mold 12 from the metal part 2. It can be achieved at the same time as the operation of removing the binder from the metal part 2, thereby further reducing the difficulty of separating the second mold 12 from the metal part 2.

[0042] Optionally, see Figure 3 and Figure 4 , Figure 4 yes Figure 1 A schematic diagram of the structure from another perspective of the middle area A; the first mold 11 is provided with a first injection port 13 and a second injection port 14, the first injection port 13 and the second injection port 14 are respectively connected to the shaping cavity, and the first injection port 13 is arranged on the first cavity wall of the shaping cavity, and the second injection port 14 is arranged on the second cavity wall of the shaping cavity, the first injection port 13 and the second injection port 14 are arranged correspondingly, and are configured to simultaneously inject powder metallurgy material into the shaping cavity through the first injection port 13 and the second injection port 14. Among them, the first cavity wall of the shaping cavity and the second cavity wall of the shaping cavity are two opposite cavity walls in the shaping cavity, and the second mold 12 is located in the shaping cavity, and the first injection port 13 and the second injection port 14 are located on opposite sides of the second mold 12.

[0043] Specifically, since the first injection port 13 is arranged on the first cavity wall of the shaping cavity, and the second injection port 14 is arranged on the second cavity wall of the shaping cavity, the first injection port 13 and the second injection port 14 are arranged correspondingly so that the first injection port 13 and the second injection port 14 are located on opposite sides of the second mold 12. Then, the impact point of the powder metallurgy material injected through the first injection port 13 on the second mold 12 can correspond to the impact point of the powder metallurgy material injected through the second injection port 14 on the second mold 12, for example, they are located on opposite sides of the same area segment of the second mold 12. Then, the force of the powder metallurgy material injected through the first injection port 13 on the second mold 12 can form a counter-attack on the second mold 12 with the force of the powder metallurgy material injected through the second injection port 14 on the second mold 12, and offset each other, thereby avoiding the powder metallurgy material from impacting the second mold 12 in a single direction during the injection process, causing the second mold 12 to deform and shift in the shaping cavity, affecting the shape and position of the through groove on the injection-molded metal part 2, and affecting the injection molding efficiency of the metal part 2.

[0044] In actual applications, if there is only one injection port for injecting powder metallurgy material into the molding cavity, or there are a first injection port and a second injection port, but the first injection port and the second injection port are both located on the same side of the second mold 12, then in the process of injecting the powder metallurgy material into the molding cavity, since the powder metallurgy material cannot form a hedge on both sides of the second mold 12, the second mold 12 is impacted in a single direction, which can easily cause the second mold 12 to deform and shift in the molding cavity.

[0045] In the present application, a first injection port 13 is arranged on the first cavity wall of the shaping cavity, and a second injection port 14 is arranged on the second cavity wall of the shaping cavity. The first injection port 13 and the second injection port 14 are arranged correspondingly, so that when the second mold 12 is located in the shaping cavity, the first injection port 13 and the second injection port 14 are located on opposite sides of the second mold 12, and the force exerted on the second mold 12 by the powder metallurgy material injected through the first injection port 13 can offset the force exerted on the second mold 12 by the powder metallurgy material injected through the second injection port 14, thereby ensuring the stability of the second mold 12 in the shaping cavity, improving the yield rate of the injection-molded metal part 2, and improving the practicality of the metallurgical mold 1.

[0046] In one embodiment, the first injection port 13 and the second injection port 14 can be arranged on two opposite cavity walls at one end of the shaping cavity. In another embodiment, the first injection port 13 and the second injection port 14 can be arranged on two opposite cavity walls in the middle of the shaping cavity. The present application does not impose any restrictions on this.

[0047] Optionally, the volume of the shaping cavity on the first side of the first injection port 13 is equal to the volume of the shaping cavity on the second side of the first injection port 13 , and the first side of the first injection port 13 and the second side of the first injection port 13 are two opposite sides of the first injection port 13 .

[0048] Among them, since the volumes of the shaping cavities on both sides of the first injection port 13 are the same, the powder metallurgy material injected into the shaping cavity through the first injection port 13 can flow to the first end of the shaping cavity and the second end of the shaping cavity at the same time, and the first end of the shaping cavity and the second end of the shaping cavity are two opposite ends of the shaping cavity. And since the first injection port 13 and the second injection port 14 are correspondingly arranged, the volume of the shaping cavity on the first side of the second injection port 14 is also equal to the volume of the shaping cavity on the second side of the second injection port 14, and the powder metallurgy material injected into the shaping cavity through the second injection port 14 can flow to the first end of the shaping cavity and the second end of the shaping cavity at the same time.

[0049] This ensures that the powder metallurgy material flows in the molding cavity in an ideal state, provides impact force to the opposite sides of the second mold 12, and ensures the stability of the second mold 12 in the molding cavity.

[0050] Among them, if the first injection port 13 and the second injection port 14 are arranged at the first end of the molding cavity, the powder metallurgy material injected into the molding cavity through the first injection port 13 and the second injection port 14 will tend to flow according to an ideal state in the initial period after entering the molding cavity, that is, to provide impact force for the opposite sides of the second mold 12. However, as the flow time of the powder metallurgy material in the molding cavity increases, the powder metallurgy material flows closer to the second end of the molding cavity. Due to the long-term flow, the powder metallurgy material flow injected through the first injection port 13 and the powder metallurgy material flow injected through the second injection port 14 may flow disorderly and mix with each other. That is, as the flow time increases, the powder metallurgy material cannot stably provide impact force for the opposite sides of the second mold 12, and the stability of the second mold 12 cannot be guaranteed. At the second end of the molding cavity, the second mold 12 may be deformed and displaced, affecting the injection molding effect of the injection-molded metal part 2.

[0051] The temperature of the powder metallurgy material injected into the molding cavity is generally 180°C to 200°C. If the first injection port 13 and the second injection port 14 are arranged at the end of one end of the molding cavity, then during the injection process, as the powder metallurgy material flows in the molding cavity, the temperature of the powder metallurgy material may decrease, and the powder metallurgy material begins to solidify, which will further increase the flow disorder of the powder metallurgy material in the molding cavity and cause extrusion to the second mold 12, causing the second mold 12 to deform and shift.

[0052] Therefore, compared with setting the first injection port 13 and the second injection port 14 at the end of the shaping cavity, the present embodiment sets the shaping cavity volumes on both sides of the first injection port 13 and the second injection port 14 to be the same, so that the powder metallurgy material injected into the shaping cavity through the first injection port 13 and the second injection port 14 can flow to the first end of the shaping cavity and the second end of the shaping cavity at the same time. This further ensures the stability of the powder metallurgy material flowing in the shaping cavity, improves the stability of the second mold 12 in the shaping cavity, and improves the stability and injection efficiency of the metallurgical mold 1 in molding the metal part 2.

[0053] Optionally, the surface length of the second mold 12 close to the first injection port 13 is smaller than the surface length of the second mold 12 close to the second injection port 14 , and the caliber of the first injection port 13 is smaller than the caliber of the second injection port 14 .

[0054] Specifically, Figure 3The second mold 12 is a curved strip, the side of the second mold 12 close to the first injection port 13 is a curved inner surface, and the side of the second mold 12 close to the second injection port 14 is a curved outer surface, that is, the surface length of the second mold 12 close to the first injection port 13 is smaller than the surface length of the second mold 12 close to the second injection port 14, and the diameter of the first injection port 13 is smaller than the diameter of the second injection port 14, wherein the first injection port 13 and the second injection port 14 are circular through holes, the diameter of the first injection port 13 is the diameter of the circular hole of the first injection port 13, and the diameter of the second injection port 14 is the diameter of the circular hole of the second injection port 14.

[0055] By setting the caliber of the first injection port 13 to be smaller than that of the second injection port 14, it can be achieved that the mass and speed of the powder metallurgy material injected into the shaping cavity through the first injection port 13 are smaller than the mass and speed of the powder metallurgy material injected into the shaping cavity through the second injection port 14. In addition, it can be achieved that the powder metallurgy material injected through the first injection port 13 and the powder metallurgy material injected through the second injection port 14 can basically reach the same area section of the second mold 12 at the same time, providing impact force for the opposite sides of the same area section of the second mold 12, improving the stability of the second mold 12 in the shaping cavity, and enhancing the user experience of the metallurgical mold 1.

[0056] In one embodiment, if Figure 2 The inner surface length of the second mold 12 shown is 38 cm, the outer surface length of the second mold 12 is 40 cm, the first injection port 13 is close to the inner surface of the second mold 12, and the second injection port 14 is close to the outer surface of the second mold 12. The caliber of the first injection port 13 can be set to 12 mm, the caliber of the second injection port 14 can be set to 13.2 mm, and so on.

[0057] It is understandable that the specific numerical settings of the first injection port 13 and the second injection port 14 can be changed according to the required size of the metal part 2 and the size of the second mold 12 used, and the present application does not impose any limitation on this.

[0058] Optionally, the first mold 11 includes a first mold core and a second mold core, the surface of the first mold core close to the second mold core corresponds to a portion of the outer surface of the metal part 2, the surface of the second mold core close to the first mold core corresponds to a portion of the outer surface of the metal part 2, the first mold core and the second mold core are fitted to form a shaping cavity, and when the first mold core and the second mold core are spaced apart along the height direction of the metallurgical mold 1, the first injection port 13 and the second injection port 14 are arranged on the second mold core.

[0059] Specifically, in the process of injection molding the metal part 2, the second mold 12 can be first placed in the area on the first mold core corresponding to the outer surface of the metal part 2, and then the second mold core is moved close to the first mold core along the height direction of the metallurgical mold 1 and fit with the first mold core to form a molding cavity, and the second mold 12 is arranged in the molding cavity. Furthermore, the powder metallurgy material is injected into the molding cavity through the first injection port 13 and the second injection port 14 on the second mold core. After the powder metallurgy material is solidified, the first mold core and the second mold core are separated to take out the molded metal part 2, so that the metal part 2 is separated from the first mold 11.

[0060] In one embodiment, if Figure 1 As shown, the first mold 11 may be provided with four molding cavities to enable injection molding of multiple metal parts 2 at the same time, thereby improving the operating efficiency of the metallurgical mold 1. In other embodiments, other numbers of molding cavities may also be provided on the first mold 11, and this application does not impose any limitation on this.

[0061] In summary, in the metallurgical mold 1 of the embodiment of the present application, the through groove of the metal part 2 is shaped by setting a second mold 12 whose melting point is lower than the melting point of the metal part 2. After the metal part 2 is injection molded, the second mold 12 can be detached from the metal part 2 by utilizing the melting point relationship, thereby reducing the difficulty of detaching the second mold 12 from the metal part 2, improving the aesthetics of the injection-molded metal part 2, improving the practicality of the metallurgical mold 1, and enhancing the user's experience of using the metallurgical mold 1.

[0062] At the same time, by setting the first injection port 13 and the second injection port 14 on the first mold 11, it is ensured that when the powder metallurgy material flows in the molding cavity, it will provide impact force to the opposite sides of the second mold 12, thereby improving the stability of the second mold 12 in the molding cavity, avoiding the deformation and displacement of the second mold 12 due to the impact of the powder metallurgy material in the molding cavity, and improving the injection molding efficiency of the metallurgical mold 1 on the metal part 2.

[0063] The present application also provides a metallurgical device (not shown), including a metallurgical mold 1 and an injection device, wherein the injection device is spaced apart from the metallurgical mold and is used to inject powder metallurgy material into the shaping cavity of the metallurgical mold 1 .

[0064] Specifically, the injection device may include two injectors, and the two injectors inject powder metallurgy materials into the shaping cavity through the first injection port 13 and the second injection port 14 respectively, so as to improve the operation efficiency of the metallurgical equipment.

[0065] Optionally, the metallurgical equipment may also include a first heating device and a second heating device. The first heating device is arranged on the injection device and is used to heat the powder metallurgy material installed in the injection device. As mentioned above, the temperature of the powder metallurgy material injected into the molding cavity is generally 180°C to 200°C. The first heating device is used to heat the powder metallurgy material to the corresponding temperature to ensure the fluidity of the powder metallurgy material.

[0066] The second heating device is spaced apart from the metallurgical mold 1 and is used to heat the first mold 11. Since the powder metallurgy material injected into the shaping cavity is at a high temperature, if the first mold 11 is not preheated, the temperature difference between the first mold 11 and the powder metallurgy material is too large. When the powder metallurgy material is injected into the shaping cavity, the high-temperature powder metallurgy material contacts the low-temperature shaping cavity wall, and the powder metallurgy material may solidify in advance, affecting the flow of the powder metallurgy material and the injection efficiency of the injection device for the powder metallurgy material. By setting the second heating device to heat the first mold 11, the premature solidification of the powder metallurgy material can be avoided, the fluidity of the powder metallurgy material in the shaping cavity can be ensured, and the stability of the operation of the metallurgical equipment can be improved.

[0067] The heating temperature of the first mold 11 by the second heating device may be equal to the heating temperature of the metal metallurgical material by the first heating device.

[0068] The present application also provides a method for injection molding of a metal part, which is applied to the metallurgical mold 1 as described above, and / or the metallurgical equipment as described above, see Figure 5 , Figure 5 1 is a flow chart of an embodiment of the injection molding method of the present application. The injection molding method provided in the embodiment of the present application specifically comprises the following steps:

[0069] S1: placing the second mold 12 between the first mold core and the second mold core, and fitting the first mold core and the second mold core together.

[0070] Specifically, the user can first place the second mold 12 between the first mold core and the second mold core, and fit the first mold core and the second mold core together to form a shaping cavity, and then the second mold 12 is located in the shaping cavity. At the same time, the second heating device can heat the first mold core and the second mold core to avoid a large temperature difference between the injected powder metallurgy material and the cavity wall of the shaping cavity, thereby ensuring the fluidity of the powder metallurgy material in the shaping cavity.

[0071] S2: Injecting powder metallurgy material into the molding cavity formed by the first mold core and the second mold core through the first injection port 13 and the second injection port 14.

[0072] After the first mold core and the second mold core are fitted together, the injection device can inject high-temperature powder metallurgy material into the molding cavity formed by the first mold core and the second mold core through the first injection port 13 and the second injection port 14. The powder metallurgy material injected through the first injection port 13 and the powder metallurgy material injected through the second injection port 14 will form an impact force on the opposite sides of the second mold 12, so that the powder metallurgy material injected into the molding cavity is solidified to form a metal blank of a desired shape, wherein the second mold 12 is located in the metal blank.

[0073] S3: Separate the first mold core and the second mold core, and separate the formed metal blank from the first mold 11 .

[0074] After the powder metallurgy material is solidified, the first mold core and the second mold core can be separated, and the formed metal blank can be separated from the first mold 11 .

[0075] S4: performing a sintering operation on the metal blank to remove the second mold 12 in the metal blank to obtain the metal part 2.

[0076] Furthermore, since the second mold 12 is still located in the metal blank at this time, the metal blank can be further sintered. Since the melting point of the second mold 12 is lower than the melting point of the metal part 2, the metal blank can be sintered at a temperature higher than the melting point of the second mold 12 but lower than the melting point of the metal part 2. When the second mold 12 is melted and separated from the metal blank, the binder component in the metal blank can be removed, thereby improving the strength of the injection-molded metal part 2, reducing the difficulty of the second mold 12 being separated from the metal part 2, and improving the user experience of the injection molding method.

[0077] In one embodiment, during the sintering process of the metal blank, an acidic substance, such as an oxalic acid solution, may be heated to assist the sintering so as to accelerate the removal rate of the second mold 12 and the binder.

[0078] Furthermore, the user may also perform operations such as polishing and coating on the metal part 2 to improve the aesthetics of the metal part 2 .

[0079] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A metallurgical mold, characterized in that: Applied to injection molding of metal parts, the metal parts are provided with through grooves, the shape of the metal parts is irregular, and the metallurgical mold comprises: A first mold having a shaping cavity, wherein the shaping cavity corresponds to the outer surface of the metal part; a second mold, arranged corresponding to the through groove of the metal part, wherein the melting point of the second mold is lower than the melting point of the metal part; In the process of injecting powder metallurgy material into the shaping cavity, the second mold is arranged in the shaping cavity, and the relative position between the second mold and the cavity wall of the shaping cavity corresponds to the relative position between the through groove of the metal part and the outer surface of the metal part.

2. The metallurgical mold according to claim 1, characterized in that: The first mold is provided with a first injection port and a second injection port, the first injection port and the second injection port are respectively connected to the shaping cavity, and the first injection port is arranged at a first cavity wall of the shaping cavity, and the second injection port is arranged at a second cavity wall of the shaping cavity, the first injection port and the second injection port are arranged correspondingly, and the first cavity wall and the second cavity wall are two opposite cavity walls in the shaping cavity; The second mold is located in the molding cavity, and the first injection port and the second injection port are located on opposite sides of the second mold.

3. The metallurgical mold according to claim 2, characterized in that: The volume of the shaping cavity on the first side of the first injection port is equal to the volume of the shaping cavity on the second side of the first injection port; the first side of the first injection port and the second side of the first injection port are two opposite sides of the first injection port.

4. The metallurgical mold according to claim 2, characterized in that: The surface length of the second mold near the first injection port is smaller than the surface length of the second mold near the second injection port, and the diameter of the first injection port is smaller than the diameter of the second injection port.

5. The metallurgical mold according to claim 2, characterized in that: The first mold includes a first mold core and a second mold core, the surface of the first mold core close to the second mold core corresponds to a portion of the outer surface of the metal part, the surface of the second mold core close to the first mold core corresponds to a portion of the outer surface of the metal part, and the first mold core and the second mold core are attached to form the shaping cavity; The first mold core and the second mold core are spaced apart in a height direction of the metallurgical mold, and the first injection port and the second injection port are arranged on the second mold core.

6. The metallurgical mold according to claim 1, characterized in that: The temperature of the powder metallurgy material injected into the shaping cavity is 180°C to 200°C.

7. A metallurgical equipment, characterized in that: It comprises a metallurgical mold and an injection device as described in any one of claims 1 to 6, wherein the injection device is spaced apart from the metallurgical mold and is used to inject powder metallurgy material into the shaping cavity of the metallurgical mold.

8. The metallurgical equipment according to claim 7, characterized in that: The metallurgical equipment also includes a first heating device and a second heating device. The first heating device is arranged on the injection device and is used to heat the powder metallurgy material loaded in the injection device; the second heating device is spaced apart from the metallurgical mold and is used to heat the first mold.

9. A method for injection molding of a metal part, characterized in that: Applied to the metallurgical mold according to any one of claims 1 to 6, and / or the metallurgical equipment according to any one of claims 7 to 8, the injection molding method comprises: Placing the second mold between the first mold core and the second mold core, and fitting the first mold core and the second mold core together; Powder metallurgy material is injected into the shaping cavity formed by the first mold core and the second mold core through the first injection port and the second injection port, so that the powder metallurgy material injected into the shaping cavity forms a desired metal part.

10. The injection molding method according to claim 9, characterized in that: After the powder metallurgy material is injected into the molding cavity and formed, the injection molding method further comprises: Separating the first mold core and the second mold core, and separating the formed metal blank from the first mold, wherein the second mold is located in the metal blank; The metal blank is subjected to a sintering operation to remove the second mold in the metal blank to obtain the metal part.

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