Die casting apparatus

Abstract

The application provides a die-casting device, which comprises a first die, a second die, a pre-casting pipe and a core assembly. The first die and the second die are provided with a first groove and a second groove which are communicated with each other. After the first die and the second die are combined, the two first grooves form a first cavity, and the two second grooves form a second cavity. Part of the core assembly is arranged in the second cavity. The pre-casting pipe is arranged in the first cavity, and one end of the pre-casting pipe extends into the second cavity and is connected with the core assembly. Part of the outer wall of the core assembly, part of the outer wall of the pre-casting pipe and part of the cavity wall of the second cavity form a forming cavity for containing metal liquid. After the metal liquid is solidified, a main shell which is integrally arranged with the pre-casting pipe is formed. That is, the main shell and the pre-casting pipe are integrally formed by secondary casting, so that the welding seam is not easy to leak after being respectively die-cast and welded, and the problem that welding cannot be performed due to the limitation of shape during welding can be effectively solved.

Description

Technical Field

[0001] This application relates to the field of die casting manufacturing technology, and more particularly to a die casting apparatus. Background Technology

[0002] When manufacturing two-section die-cast pipes, the process typically involves die-casting followed by welding. This means that the two sub-pipes are cast separately and then welded together to form a complete die-cast pipe.

[0003] However, when using welding to connect pipes, the weld seam is prone to leakage, and there may be situations where welding is impossible due to the limitations of the pipe structure. Utility Model Content

[0004] The purpose of this application is to provide a die-casting apparatus that aims to solve the problems of easy leakage of weld seams caused by welded connections and the inability to weld due to structural influences.

[0005] This application provides a die-casting apparatus, including a first mold, a second mold, a pre-cast tube, and a core assembly; Both the first mold and the second mold are provided with a first groove and a second groove that are interconnected. After the first mold and the second mold are closed, the two first grooves enclose each other to form a first cavity, and the two second grooves enclose each other to form a second cavity. A portion of the core assembly is disposed in the second cavity, and the precast tube is disposed in the first cavity with one end extending into the second cavity and connected to the core assembly. A molding cavity for containing molten metal is formed between a portion of the outer wall of the core assembly, a portion of the outer wall of the precast tube, and a portion of the cavity wall of the second cavity, so that the molten metal solidifies to form a main shell integrally disposed with the precast tube. In some embodiments, the precast tube includes a fusion zone, an exposure zone, and a void zone connected in sequence; At least a portion of the fusion zone extends into the second cavity and is connected to the core assembly; the exposed area is sealed to the cavity wall of the first cavity; and the clearance area is clearance-fitted to the cavity wall of the first cavity.

[0006] In some embodiments, the core assembly includes a first core and a second core disposed on opposite sides of the precast tube, the first core and the second core being movable toward each other and surrounding the periphery of the precast tube, and the first core, the second core and the precast tube being closedly disposed together.

[0007] In some embodiments, the first core and the second core are each provided with a countersunk platform on the side near the precast tube, and the two countersunk platforms enclose a blind hole that matches the outer contour of the precast tube. The bottom wall of the blind hole is in a closed fit with the end of the precast tube.

[0008] In some embodiments, a first positioning part is provided at one end of the precast tube, and a second positioning part is provided on the core assembly, wherein the first positioning part and the second positioning part are positioned and engaged.

[0009] In some embodiments, one of the first positioning portion and the second positioning portion is a snap-fit ​​protrusion, and the other of the first positioning portion and the second positioning portion is a snap-fit ​​groove that snaps into the snap-fit ​​protrusion. And / or, the first positioning part includes at least two, and at least two second positioning parts are disposed on opposite sides of the precast pipe, the second positioning part includes at least two, and the at least two second positioning parts correspond one-to-one with the at least two first positioning parts.

[0010] In some embodiments, one end of the precast tube is provided with a first positioning plane, and the cavity wall of the first cavity or the outer wall surface of the core assembly is provided with a second positioning plane that positions and cooperates with the first positioning plane.

[0011] In some embodiments, the precast pipe is provided with a third positioning part, and the first mold or the second mold is provided with a fourth positioning part, wherein the third positioning part and the fourth positioning part are positioned and engaged.

[0012] In some embodiments, one of the third positioning part and the fourth positioning part is a positioning protrusion, and the other of the third positioning part and the fourth positioning part is a positioning hole that engages with the positioning protrusion. And / or, the third positioning part is disposed on the side of the precast tube facing the cavity wall of the first cavity, the first mold or the second mold is provided with a recessed groove facing the cavity wall of the first cavity, and the fourth positioning part is disposed in the recessed groove. And / or, the third positioning part is located at the other end of the precast tube.

[0013] In some embodiments, the main housing is formed by die casting of a first alloy, and the precast tube is formed by die casting of a second alloy; The melting point of the first alloy is not higher than that of the second alloy; and / or, the first alloy is at least one of zinc alloy, aluminum alloy and magnesium alloy; and / or, the second alloy is at least one of zinc alloy, aluminum alloy and copper alloy.

[0014] The beneficial effects of this utility model are: This application provides a die-casting apparatus, which includes a first mold, a second mold, a pre-cast tube, and a core assembly. Both the first and second molds are provided with interconnected first and second grooves. After the first and second molds are closed, the two first grooves enclose to form a first cavity, and the two second grooves enclose to form a second cavity. A portion of the core assembly is located in the second cavity, and the pre-cast tube is located in the first cavity, with one end extending into the second cavity and connected to the core assembly. A portion of the outer wall of the core assembly, a portion of the outer wall of the pre-cast tube, and a portion of the cavity wall of the second cavity enclose to form a forming cavity for containing molten metal. This allows the molten metal to solidify and form a main shell integrally formed with the pre-cast tube. Thus, through a secondary casting process, the main shell and the pre-cast tube are die-cast into a single structure, avoiding the problem of easy leakage at weld seams caused by welding after separate die-casting, and effectively solving the problem of welding being impossible due to shape limitations. Attached Figure Description To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the die-casting apparatus shown in the embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the die-casting apparatus shown in the embodiments of this application. Figure 2 ; Figure 3 A schematic diagram of the die-casting apparatus shown in the embodiments of this application, with the main housing removed. Figure 1 ; Figure 4 A schematic diagram of the die-casting apparatus shown in the embodiments of this application, with the main housing removed. Figure 2 ; Figure 5 This is a schematic diagram of the core assembly of the die-casting apparatus shown in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the pre-cast tube of the die-casting apparatus shown in the embodiments of this application. Figure 1 ; Figure 7 This is a schematic diagram of the structure of the pre-cast tube of the die-casting apparatus shown in the embodiments of this application. Figure 2 ; Figure 8 This is a schematic diagram of the structure of the first mold of the die-casting apparatus shown in the embodiment of this application.

[0016] Figure label: 100, First mold; 110, First groove; 120, Second groove; 130, Molding cavity; 140, Fourth positioning part; 150, Sink; 200, Precast tube; 210, Fusion zone; 220, Exposed zone; 230, Clearance zone; 240, First positioning part; 250, First positioning plane; 260, Third positioning part; 300, Core assembly; 310, First core; 320, Second core; 330, Sink; 340, Blind hole; 350, Second positioning part; 400, Main shell. Detailed Implementation

[0017] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0018] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0019] Reference Figures 1 to 8 As shown in the figure, this application provides a die-casting apparatus, including a first mold 100, a second mold, a pre-cast tube 200, and a core assembly 300.

[0020] Both the first mold 100 and the second mold are provided with a first groove 110 and a second groove 120 that are interconnected. After the first mold 100 and the second mold are closed, the two first grooves 110 enclose each other to form a first cavity, and the two second grooves 120 enclose each other to form a second cavity.

[0021] A portion of the core assembly 300 is located in the second cavity, and the precast tube 200 is located in the first cavity with one end extending into the second cavity and connected to the core assembly 300. A portion of the outer wall of the core assembly 300, a portion of the outer wall of the precast tube 200, and a portion of the cavity wall of the second cavity enclose and form a molding cavity 130 for containing molten metal, so that after the molten metal solidifies, it forms a main shell 400 integrally formed with the precast tube 200. In specific implementation, the first mold 100 and the second mold are mold components used in combination. During die casting, the two are closed. Since both the first mold 100 and the second mold are provided with a first groove 110 and a second groove 120 that are interconnected, when the first mold 100 and the second mold are closed, the first groove 110 of the first mold 100 and the first groove 110 of the second mold together enclose a complete first cavity, while the second groove 120 of the first mold 100 and the second groove 120 of the second mold together enclose a complete second cavity.

[0022] Specifically, the outline dimensions of the first groove 110 of the first mold 100 and the second groove 120 of the second mold are identical. The inner contour of the first cavity formed by the two first grooves 110 can be approximately adapted to the contour of the precast tube 200 to better accommodate the precast tube 200. Similarly, the inner contour shape of the second cavity formed by the two second grooves 120 can be approximately adapted to the contour shape of a portion of the core assembly 300 to better accommodate the core assembly 300.

[0023] Since one end of the precast tube 200 extends into the second cavity, and part of the core assembly 300 is located in the second cavity, and a gap needs to be set between the core assembly 300 and the cavity wall of the second cavity, the outer wall of part of the core assembly 300, the outer wall of one end of the precast tube 200, and part of the cavity wall of the second cavity can be enclosed to form a molding cavity 130 that matches the contour of the main shell 400. Therefore, after the molten metal is placed in the molding cavity 130 and the molten metal solidifies, the main shell 400 can be formed. Since part of the molten metal is die-cast on the outer wall of one end of the precast tube 200, the final main shell 400 and the precast tube 200 are integrally formed. That is, the precast tube 200 is precast first, and then the main shell 400 and the precast tube 200 are integrally formed by secondary die casting. This can realize the manufacturing of an integral structure and avoid the problems of easy leakage of weld seams and limited welding operation caused by welding.

[0024] For example, the molten metal can be an alloy liquid or a pure metal liquid, etc. The appropriate molten metal material needs to be selected based on the material of the main shell 400.

[0025] The die-casting apparatus of this embodiment includes a first mold 100, a second mold, a pre-cast tube 200, and a core assembly 300. Both the first mold 100 and the second mold are provided with a first groove 110 and a second groove 120 that are interconnected. After the first mold 100 and the second mold are closed, the two first grooves 110 enclose each other to form a first cavity, and the two second grooves 120 enclose each other to form a second cavity. A portion of the core assembly 300 is located in the second cavity, and the precast tube 200 is located in the first cavity with one end extending into the second cavity and connected to the core assembly 300. A portion of the outer wall of the core assembly 300, a portion of the outer wall of the precast tube 200, and a portion of the cavity wall of the second cavity enclose and form a molding cavity 130 for containing molten metal, so that after the molten metal solidifies, it forms a main shell 400 integrally formed with the precast tube 200. Thus, the main shell 400 and the precast tube 200 are die-cast into an integral structure through secondary casting, which avoids the easy leakage of weld seams caused by welding after separate die-casting and can effectively solve the problem of welding failure due to shape limitations.

[0026] Reference Figure 6 and Figure 7 As shown, in some embodiments, the precast tube 200 includes a fusion zone 210, an exposure zone 220, and a clearance zone 230 connected in sequence.

[0027] At least a portion of the fusion region 210 extends into the second cavity and is connected to the core assembly 300. The exposed region 220 is sealed to the cavity wall of the first cavity, and the clearance region 230 is clearance-fitted to the cavity wall of the first cavity.

[0028] In specific implementation, this embodiment divides the precast tube 200 into three regions. The section connected to the core assembly 300 is the fusion region 210. At least a portion of the outer wall surface of the fusion region 210, together with a portion of the outer wall surface of the core assembly 300 and a portion of the cavity wall of the second cavity, forms the molding cavity 130. Therefore, at least a portion of the fusion region 210 is used to contact the molten metal, allowing the molten metal to solidify and connect to the outer wall surface of the fusion region 210. This section is used to contact the molten metal and is therefore called the fusion region 210. The section located in the fusion region 210 away from the core assembly 300 is called the exposed region 220, which is a portion of the final product's exterior surface. This portion is exposed and does not contact the molten metal, thus preventing the molten metal from entering and achieving a sealing effect. This section also has a sealed fit with the cavity wall of the first cavity to achieve reliable positioning and support of the precast tube 200 within the first cavity. The fit gap between the exposed region 220 and the first cavity is typically no greater than 0.1 mm. The section located in the exposed area 220 away from the fusion area 210 is called the clearance area 230. This section is fitted with the cavity wall of the first cavity with a gap, that is, there is a preset gap between the two. This setting can prevent the problem of unstable shrinkage after the precast tube 200 is formed, which would prevent it from being placed into the first cavity. In other words, it provides sufficient space to accommodate the precast tube 200.

[0029] For example, the fusion zone 210, the exposure zone 220 and the shelter zone 230 are integrally formed.

[0030] Reference Figures 1 to 5 As shown, in some embodiments, the core assembly 300 includes a first core 310 and a second core 320 disposed on opposite sides of the precast tube 200. The first core 310 and the second core 320 are movable toward each other and surround the periphery of the precast tube 200, and the first core 310, the second core 320 and the precast tube 200 are closedly disposed.

[0031] In a specific implementation, the core assembly 300 includes two parts, namely a first core 310 and a second core 320, so that the two can be fastened together and connected to one end of the precast tube 200. The structure after the first core 310 and the second core 320 are fastened together seals one end of the precast tube 200, so as to prevent the molten metal from entering the precast tube 200 through one end and causing the inner cavity of the precast tube 200 to be blocked.

[0032] Furthermore, to facilitate fastening, the first core 310 and the second core 320 can be moved toward each other or away from each other, so that after the first core 310 and the second core 320 are fastened, they can surround and cover the periphery of the precast tube 200. That is, the outline of the first core 310 and the second core 320 after being fastened is adapted to the outer outline of the precast tube 200, so that a part of the outer wall of the first core 310, a part of the outer wall of the second core 320, a part of the outer wall of the precast tube 200, and a part of the cavity wall of the second cavity are surrounded to form a forming cavity 130 for containing molten metal.

[0033] For example, both the first core 310 and the second core 320 can be pipe structures. The gaps between the first core 310 and the second core 320 and the cavity wall of the second cavity are uniformly arranged to ensure that the wall thickness of the final formed main housing 400 is uniform. Furthermore, the gaps between the first core 310, the second core 320 and the cavity wall of the second cavity are determined according to the wall thickness requirements of the main housing 400, that is, the size of the gap is the wall thickness dimension of the main housing 400.

[0034] Furthermore, since there is a seam between the first core 310 and the second core 320, a small amount of molten metal will enter the seam during die casting. Eventually, it will solidify between the two to form a part of the excess structure. Finally, after the first core 310 and the second core 320 are moved away from each other and out of the main housing 400, this part of the excess structure can be manually knocked off or opened with mechanical tools, so that a complete and smooth inner cavity is formed inside the main housing 400, and this inner cavity is connected to the inner cavity of the precast tube 200.

[0035] Reference Figure 5 As shown, in some embodiments, a recessed platform 330 is provided on the side of the first core 310 and the second core 320 near the precast tube 200. The two recessed platforms 330 enclose a blind hole 340 that matches the outer contour of the precast tube 200. The bottom wall of the blind hole 340 is closed and fitted with the end of the precast tube 200.

[0036] In specific implementation, to prevent molten metal from entering the pre-cast tube 200 through one end and causing blockage of the inner cavity, recessed platforms 330 can be provided on the side of the first core 310 and the second core 320 near the pre-cast tube 200, facing away from the pre-cast tube 200. After the first core 310 and the second core 320 surround the periphery of the pre-cast tube 200, the two platforms 330 just form a blind hole 340 that matches the outer contour of the pre-cast tube 200. That is, the bottom wall of the platform 330 forms the bottom wall of the blind hole 340. The bottom wall of the blind hole 340 is used to seal one end of the pre-cast tube 200 to prevent molten metal from entering the inner cavity of the pre-cast tube 200 and causing blockage, thus rendering it unusable.

[0037] Reference Figures 5 to 7 As shown, in some embodiments, a first positioning part 240 is provided at one end of the precast tube 200, and a second positioning part 350 is provided on the core assembly 300. The first positioning part 240 and the second positioning part 350 are positioned and engaged to form the main reference for axial positioning. At the same time, the first positioning part 240 and the second positioning part 350 can adopt an interference fit or a zero clearance fit. The clearance of the clearance fit can be 0mm-0.03mm, so that when the first mold 100 and the second mold are closed, the first positioning part 240 and the second positioning part 350 can first connect and engage to accurately define the axial position of the precast tube 200 and form the first sealing barrier to effectively prevent molten metal from immersing into the inner cavity of the precast tube 200 along the axial direction.

[0038] In a specific implementation, one of the first positioning part 240 and the second positioning part 350 is a snap-fit ​​protrusion, and the other of the first positioning part 240 and the second positioning part 350 is a snap-fit ​​groove that snaps into the snap-fit ​​protrusion, so as to achieve positioning and sealing between the precast tube 200 and the core assembly 300.

[0039] For example, refer to Figures 5 to 7 As shown, a snap-fit ​​protrusion can be provided at one end of the precast tube 200, and a snap-fit ​​groove can be provided on the outer wall of the core assembly 300, or a snap-fit ​​groove can be provided at one end of the precast tube 200, and a snap-fit ​​protrusion can be provided on the outer wall of the core assembly 300.

[0040] For example, the first positioning part 240 includes at least two, and at least two second positioning parts 350 are disposed on opposite sides of the precast tube 200. The second positioning parts 350 include at least two, and the at least two second positioning parts 350 correspond one-to-one with the at least two first positioning parts 240, so as to further improve the positioning accuracy and sealing accuracy between the precast tube 200 and the core assembly 300 through the cooperation of the at least two first positioning parts 240 and the second positioning parts 350.

[0041] Reference Figure 5 and Figure 6 As shown, in some embodiments, a first positioning plane 250 is provided at one end of the precast tube 200, and a second positioning plane is provided on the cavity wall of the first cavity or the outer wall surface of the core assembly 300 to position and cooperate with the first positioning plane 250. By closely fitting the first positioning plane 250 and the second positioning plane, a radial positioning reference is formed, which can effectively resist the lateral impact force and rotation tendency generated during the filling of molten metal, so as to prevent the precast tube 200 from rotating or swaying in the first cavity and affecting the yield of the final molded structure.

[0042] Reference Figures 5 to 8As shown, in some embodiments, a third positioning part 260 is provided on the precast tube 200, and a fourth positioning part 140 is provided on the first mold 100 or the second mold. The third positioning part 260 and the fourth positioning part 140 are positioned and engaged to ensure that the precast tube 200 is accurately placed in the first cavity, thereby improving placement accuracy and efficiency. In addition, the positioning and engagement of the first positioning part 240 and the second positioning part 350 can also limit the spatial displacement tendency of the precast tube 200 under complex flow fields. Furthermore, the positioning and engagement of the third positioning part 260 and the fourth positioning part 140 can form a second sealing barrier, effectively preventing molten metal from entering the inner cavity of the precast tube 200, thus forming a reliable sealing system together with the first positioning part 240 and the second positioning part 350.

[0043] In a specific implementation, one of the third positioning part 260 and the fourth positioning part 140 is a positioning protrusion, and the other of the third positioning part 260 and the fourth positioning part 140 is a positioning hole that engages with the positioning protrusion, so as to achieve sealing and positioning between the precast pipe 200 and the first mold 100 or the second mold.

[0044] For example, positioning protrusions can be provided on the precast pipe 200, and positioning holes can be provided on the first mold 100 or the second mold. Alternatively, positioning holes can be provided on the precast pipe 200, and positioning protrusions can be provided on the first mold 100 or the second mold.

[0045] Alternatively, at least two third positioning parts 260 and fourth positioning parts 140 may be provided, with at least one set of third positioning parts 260 and fourth positioning parts 140 provided between the first mold 100 and the precast pipe 200, and between the second mold and the precast pipe 200, to further improve positioning accuracy and sealing accuracy.

[0046] In specific implementation, refer to Figures 5 to 8 As shown, the third positioning part 260 is disposed on the side of the precast tube 200 facing the cavity wall of the first cavity. The first mold 100 or the second mold is provided with a recessed groove 150 facing the cavity wall of the first cavity. The fourth positioning part 140 is disposed in the groove 150. This arrangement can avoid affecting the mold closing operation of the first mold 100 and the second mold.

[0047] For example, the third positioning part 260 is located at the other end of the precast tube 200 to avoid affecting the fit between the precast tube 200 and the first cavity.

[0048] In some embodiments, the main housing 400 is die-cast using a first alloy, and the pre-cast tube 200 is die-cast using a second alloy. The melting point of the first alloy is not higher than that of the second alloy, so as to avoid the problem of the pre-cast tube 200 dissolving during die-casting of molten metal, which would affect the yield of the final molded structure.

[0049] For example, the first alloy is at least one of zinc alloy, aluminum alloy and magnesium alloy.

[0050] For example, the second alloy is at least one of zinc alloy, aluminum alloy and copper alloy.

[0051] In summary, the die-casting device of this embodiment adopts an innovative process of "pre-casting of pre-cast tube 200, regional definition of pre-cast tube 200, precision mold positioning, and local fusion", which realizes high-quality, low-cost, and integrated manufacturing of complex internal cavity components.

[0052] Furthermore, in this embodiment, the inner cavity of the precast pipe 200 is formed by die casting in one step, and the inner wall is smooth and free of residue. This fundamentally avoids the pollution risk of sand core casting and the inherent defects of welding and splicing, ensuring the purity of the fluid medium. It is especially suitable for sanitary ware, food and other fields with high requirements for hygiene and safety.

[0053] Simultaneously, the main shell 400 and the precast tube 200 are joined in the fusion zone 210 by metallurgical means, resulting in thorough interface fusion and a connection strength far exceeding that of mechanical connections. This achieves an essential seal, completely eliminating the risk of leakage. A unique precision mold positioning system (including the cooperation of the first positioning part 240 and the second positioning part 350, the cooperation of the third positioning part 260 and the fourth positioning part 140, and the cooperation of the first positioning plane 250 and the second positioning plane) forms a double guarantee with the initial positioning in the exposed zone 220, effectively resisting the impact of die casting and ensuring high positioning accuracy of the precast tube 200 during the assembly process, significantly improving product consistency and yield.

[0054] The 200mm exposed precast tube design breaks through the limitations of traditional insert die casting which completely encloses the tube, increasing product design flexibility and enabling more complex functional integration and aesthetic styling. This modular approach simplifies the production process, avoids complex procedures such as sand core fabrication and segmented welding, improves material utilization, and reduces overall costs.

[0055] Finally, the die-casting process using a die-casting device is briefly described below: First, the pre-cast tube 200, which has been pre-die-cast, is placed in the first cavity formed by the first mold 100 and the second mold, and one end of the pre-cast tube 200 is inserted into the second cavity formed by the first mold 100 and the second mold. Then, a portion of the core assembly 300 is placed inside the second cavity and connected to one end of the precast tube 200, such that a portion of the outer wall of the core assembly 300, a portion of the outer wall of the precast tube 200, and a portion of the cavity wall of the second cavity are enclosed to form a molding cavity 130. Finally, molten metal is placed in the molding cavity 130, and after the molten metal solidifies, a main shell 400 is formed integrally with the precast tube 200.

[0056] For example, the die casting process parameters range as follows: the temperature of the molten metal is 200℃-800℃, the injection pressure is 50-150kg / cm², the injection time is 0.5-3.0 seconds, and the mold cooling time is 2.5-7.5 seconds.

[0057] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0058] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A die-casting apparatus, characterized in that, It includes a first mold (100), a second mold, a precast tube (200), and a core assembly (300); Both the first mold (100) and the second mold are provided with a first groove (110) and a second groove (120) that are interconnected. After the first mold (100) and the second mold are closed, the two first grooves (110) surround each other to form a first cavity, and the two second grooves (120) surround each other to form a second cavity. A portion of the core assembly (300) is disposed in the second cavity, and the precast tube (200) is disposed in the first cavity with one end of the precast tube (200) extending into the second cavity and connected to the core assembly (300). A molding cavity (130) for containing molten metal is formed by a portion of the outer wall of the core assembly (300), a portion of the outer wall of the precast tube (200), and a portion of the cavity wall of the second cavity, so that the molten metal solidifies to form a main shell (400) integrally formed with the precast tube (200).

2. The die-casting apparatus according to claim 1, characterized in that, The precast pipe (200) includes a fusion zone (210), an exposure zone (220), and a clearance zone (230) connected in sequence. At least a portion of the fusion region (210) extends into the second cavity and is connected to the core assembly (300), the exposed region (220) is sealed to the cavity wall of the first cavity, and the clearance region (230) is clearance-fitted to the cavity wall of the first cavity.

3. The die-casting apparatus according to claim 1, characterized in that, The core assembly (300) includes a first core (310) and a second core (320) disposed on opposite sides of the precast tube (200). The first core (310) and the second core (320) are movable toward each other and surround the periphery of the precast tube (200), and the first core (310), the second core (320) and the precast tube (200) are closedly disposed.

4. The die-casting apparatus according to claim 3, characterized in that, Both the first core (310) and the second core (320) have a recessed platform (330) on the side near the precast tube (200). The two recessed platforms (330) enclose a blind hole (340) that matches the outer contour of the precast tube (200). The bottom wall of the blind hole (340) is closed and fitted with the end of the precast tube (200).

5. The die-casting apparatus according to claim 1, characterized in that, One end of the precast tube (200) is provided with a first positioning part (240), and the core assembly (300) is provided with a second positioning part (350). The first positioning part (240) and the second positioning part (350) are positioned and cooperated.

6. The die-casting apparatus according to claim 5, characterized in that, One of the first positioning part (240) and the second positioning part (350) is a snap-fit ​​protrusion, and the other of the first positioning part (240) and the second positioning part (350) is a snap-fit ​​groove that snaps into the snap-fit ​​protrusion. And / or, the first positioning part (240) includes at least two, and at least two second positioning parts (350) are disposed on opposite sides of the precast tube (200), the second positioning parts (350) include at least two, and the at least two second positioning parts (350) correspond one-to-one with the at least two first positioning parts (240).

7. The die-casting apparatus according to claim 1, characterized in that, One end of the precast tube (200) is provided with a first positioning plane (250), and the cavity wall of the first cavity or the outer wall surface of the core assembly (300) is provided with a second positioning plane that positions and cooperates with the first positioning plane (250).

8. The die-casting apparatus according to claim 7, characterized in that, The precast pipe (200) is provided with a third positioning part (260), and the first mold (100) or the second mold is provided with a fourth positioning part (140). The third positioning part (260) and the fourth positioning part (140) are positioned and cooperated.

9. The die-casting apparatus according to claim 8, characterized in that, One of the third positioning part (260) and the fourth positioning part (140) is a positioning protrusion, and the other of the third positioning part (260) and the fourth positioning part (140) is a positioning hole that engages with the positioning protrusion; And / or, the third positioning part (260) is disposed on the side of the precast tube (200) facing the cavity wall of the first cavity, and the first mold (100) or the second mold is provided with a recessed groove (150) facing the cavity wall of the first cavity, and the fourth positioning part (140) is disposed in the groove (150). And / or, the third positioning part (260) is located at the other end of the precast tube (200).

10. The die-casting apparatus according to claim 1, characterized in that, The main housing (400) is formed by die casting of a first alloy, and the precast tube (200) is formed by die casting of a second alloy; The melting point of the first alloy is not higher than that of the second alloy; and / or, the first alloy is at least one of zinc alloy, aluminum alloy and magnesium alloy; and / or, the second alloy is at least one of zinc alloy, aluminum alloy and copper alloy.

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