Die-casting die for shell

Abstract

The invention belongs to the technical field of die-casting dies, and provides a die-casting die for a shell, which comprises a movable die assembly, a fixed die assembly, a sliding block mechanism, a cooling mechanism and a feeding mechanism, the sliding block mechanism comprises an auxiliary sliding block, and the auxiliary sliding block comprises a feeding end face and a profiling face. The fixed mold assembly comprises a mold core, and a cooling hole is formed in the mold core; the cooling mechanism comprises a high-pressure point cooling pipe, and the high-pressure point cooling pipe is used for forming a cooling loop in the sleeve; the feeding mechanism comprises a main flow channel and a feeding channel. Compared with the prior art, the auxiliary sliding block is arranged on the side wall, without an inverted buckle structure, of the product cavity to serve as a feeding auxiliary structure, the feeding direction of the product cavity is parallel to the thickness direction of the shell in cooperation with the feeding mechanism, stable feeding of molten metal in the thickness direction of the shell is achieved, and strong impact on local parts of the cavity is avoided; and the filling uniformity of the molten metal is improved.

Description

Technical Field

[0001] This invention belongs to the field of die casting mold technology, and specifically relates to a die casting mold for housings. Background Technology

[0002] Housing components, as fundamental structural parts of various equipment, are widely used in electronics, automobiles, construction machinery, and other fields. Their molding quality directly affects the assembly accuracy and performance of the equipment. Currently, housings are mostly formed using die casting. Die casting molds generally consist of a moving mold assembly, a fixed mold assembly, a slider mechanism, a cooling mechanism, and a feeding mechanism. The product cavity is formed by mold closing, and molten metal is injected into the cavity through the feeding mechanism, cooled, and solidified. After mold opening, the housing is demolded.

[0003] Existing die-casting molds used for shells exhibit several problems affecting molding quality and production efficiency in actual production: Firstly, the feeding direction of the shell product cavity is often perpendicular to the thickness direction. This feeding method easily causes strong impacts on localized areas of the cavity when molten metal is injected, leading to defects such as erosion, shrinkage cavities, and porosity after shell molding. Furthermore, for shell sidewall areas without undercut structures, the lack of targeted feeding auxiliary structures prevents stable feeding along the shell thickness direction, resulting in poor uniformity of molten metal filling. Secondly, the mold core, as a key component in molding the shell's inner cavity, ... The cooling mechanism is mostly a single cooling pipe structure with limited cooling area. The bottom wall area of ​​the core, which is far from the cooling pipe, cools slowly, creating a significant temperature difference with other areas. This leads to warping and deformation of the shell after molding due to uneven thermal shrinkage, reducing the dimensional accuracy of the shell. Thirdly, the venting structure of the mold is simple, with venting grooves only set on the mating surface of the fixed mold and the moving mold. No venting channels are added using the clearance between the slider mechanism and the moving mold assembly. The venting efficiency of the cavity is low, and the gas remaining inside is easily trapped in the molten metal, forming porosity defects, which further reduces the shell molding qualification rate.

[0004] Meanwhile, the existing mold's cooling mechanism has poor sealing, making it prone to coolant leakage and affecting the stability of the cooling effect; the feed channel's structural design is not adapted to the feed direction, making it difficult to control the molten metal flow rate and causing turbulence and air entrapment. These problems all lead to a low yield of die-cast shells, and the mold has high maintenance costs and difficulty in improving production efficiency.

[0005] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is to provide a die-casting mold for housings that offers high molding quality, uniform cooling, effective venting, and stable feeding. By setting an auxiliary feeding slider on the side wall of the product cavity without undercuts, the feeding direction is made parallel to the thickness direction of the housing. Simultaneously, the auxiliary slider, in conjunction with the moving mold assembly, adds venting channels, effectively solving problems such as warping, deformation, porosity, and uneven molten metal filling that occur during the die-casting process, thereby improving the molding qualification rate and production efficiency of the housing. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a die-casting mold for housings, in view of the current state of the prior art.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a die-casting mold for a housing is proposed, comprising: a moving mold assembly, a fixed mold assembly, a slider mechanism, a cooling mechanism, and a feeding mechanism; the moving mold assembly and the fixed mold assembly are movably pressed together; the slider mechanism is disposed on the moving mold assembly; when the moving mold assembly and the fixed mold assembly are pressed together, a product cavity for forming the housing is formed between the moving mold assembly, the fixed mold assembly, and the slider mechanism; The slider mechanism includes an auxiliary slider having a feed end face facing the fixed mold assembly and a contoured surface facing the product cavity; The fixed mold assembly includes a core extending into the product cavity, the core being used to form the inner cavity of the housing, and the core having cooling holes inside; The cooling mechanism includes a sleeve inserted into the cooling hole and a high-pressure cooling pipe disposed within the sleeve, the high-pressure cooling pipe forming a cooling circuit within the sleeve; wherein... A cooling cavity is formed between the end of the sleeve and the bottom wall of the cooling hole. The outlet of the high-pressure cooling pipe extends into the cooling cavity. The cooling cavity is used to increase the cooling area of ​​the bottom wall region of the cooling hole. The feeding mechanism includes a main channel disposed between the feeding end face and the fixed mold assembly, and a feeding channel connecting the main channel and the product cavity; wherein... The feed channel extends to the contoured surface of the auxiliary slider and is arranged along the direction from the fixed mold assembly to the moving mold assembly, so that the feeding direction of the product cavity is parallel to the thickness direction of the shell.

[0008] In one of the die-casting molds for a housing described above, the housing includes a body with an opening and a flange extending away from the body from the opening; a groove is provided on the contoured surface; wherein, The groove is used to form at least a partial structure of the flange and to provide a force to the flange in the same direction of movement as the moving mold assembly when the fixed mold assembly separates from the housing.

[0009] The aforementioned die-casting mold for a housing further includes an venting assembly; wherein the venting assembly includes at least an venting groove disposed between the auxiliary slider and the fixed mold assembly.

[0010] In the aforementioned die-casting mold for a housing, the cooling hole has a countersunk hole at one end away from the moving mold assembly; the sleeve includes a sleeve body and a boss, the boss being adapted to the countersunk hole; wherein, when the sleeve is installed to the core, the sleeve body is inserted into the cooling hole and a sealing ring is provided between them, and the boss is inserted into the countersunk hole.

[0011] In one of the die-casting molds for housings described above, the distance between the end of the sleeve and the bottom wall of the cooling hole is 40%-50% of the thickness of the bottom wall of the cooling hole to the end of the core facing the moving mold assembly.

[0012] In one of the die-casting molds for a housing described above, the feed channel includes a stepped flared section, the larger end of which faces the main feed channel, and the smaller end which connects to the product cavity; wherein... The stepped flaring section is used to reduce the flow rate of molten metal into the product cavity and reduce the impact on the flanging forming area.

[0013] In one of the die-casting molds for a housing described above, the venting groove extends along the contact surface between the auxiliary slider and the fixed mold assembly, and communicates with the venting block disposed on the moving mold assembly; wherein, The exhaust block is connected to an external vacuum pumping device via a vacuum valve, which is used to actively expel the cavity gas during the mold closing stage.

[0014] In the aforementioned die-casting mold for a housing, the draft angle of the groove is 1°-3°, and the direction of the draft angle is consistent with the mold opening direction of the moving mold assembly; and the inner wall and bottom surface of the groove are both polished mirror surface, and the side wall of the groove is also polished mirror surface.

[0015] In the aforementioned die-casting mold for a housing, the sleeve is fixed to the cooling hole by welding, and the high-pressure cooling pipe is threadedly connected to the sleeve.

[0016] In one of the die-casting molds for housings described above, the high-pressure cooling pipe is connected to an external coolant circulation system via a quick-connect coupling.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) By setting an auxiliary slider as a feeding auxiliary structure on the side wall of the product cavity without undercut structure, and cooperating with the feeding mechanism to make the feeding direction of the product cavity parallel to the shell thickness direction, the molten metal is fed smoothly along the shell thickness direction, avoiding strong impact on the cavity and improving the uniformity of molten metal filling; at the same time, a cooling mechanism with a cooling cavity is set in the core, and the outlet of the high-pressure cooling pipe extends to the cooling cavity to form a cooling circuit, which greatly increases the cooling area of ​​the bottom wall of the cooling hole and accelerates the heat conduction efficiency, realizing uniform cooling of the core and avoiding warping deformation caused by uneven thermal shrinkage of the shell; the feeding end face of the auxiliary slider cooperates with the fixed mold assembly to form a feeding flow channel, and the conformal surface is adapted to the cavity to ensure the forming accuracy of the outer contour of the shell. The overall structure realizes the smooth feeding and uniform cooling of the shell die casting, greatly improving the basic forming quality of the shell.

[0019] (2) By setting a groove with a specific structure on the auxiliary slider contour surface to form the flange of the shell, the 1°-3° demolding slope of the groove is consistent with the mold opening direction, and the inner wall, bottom surface and side wall are all polished mirror surface, which not only ensures the forming size accuracy of the flange, but also greatly reduces the contact friction between the flange and the groove and the demolding resistance. At the same time, the groove applies the same force to the flange in the same direction as the moving mold when demolding, which effectively prevents the flange from sticking to the mold, breaking and deforming, and realizes the accurate forming and smooth demolding of the flange, thereby improving the forming qualification rate of the key assembly structure of the shell.

[0020] (3) By setting an exhaust groove between the auxiliary slider and the fixed mold assembly and adding an exhaust channel between the auxiliary slider and the moving mold assembly, the two are connected and connected to the exhaust block with a vacuum valve to form a multi-path active exhaust structure. The structure arrangement of the auxiliary slider increases the cavity exhaust path and exhaust area. Combined with the external vacuum device to actively extract air during the mold closing stage, the cavity exhaust efficiency is greatly improved, and the residual gas in the cavity is discharged to the maximum extent. This fundamentally avoids the formation of porosity defects by molten metal encasing gas. At the same time, the multi-path exhaust structure can quickly discharge the gas generated during the die casting filling process, reduce the turbulent gas entrapment phenomenon, and further improve the molding density of the shell. Attached Figure Description

[0021] Figure 1 It is a three-dimensional view of the shell.

[0022] Figure 2 This is a perspective view of a die-casting mold for a housing according to the present invention.

[0023] Figure 3 yes Figure 2 Floor plan.

[0024] Figure 4 yes Figure 3 Sectional view at point AA.

[0025] Figure 5 yes Figure 4A magnified view of a section at point B.

[0026] Figure 6 This is a perspective view of a die-casting mold for a housing according to the present invention, after concealing the fixed mold assembly.

[0027] Figure 7 It is a 3D diagram of the auxiliary slider.

[0028] In the diagram, 10 is the shell; 11 is the body; 12 is the flange; 100 is the moving mold assembly; 200 is the fixed mold assembly; 210 is the core; 211 is the cooling hole; 300 is the slider mechanism; 310 is the auxiliary slider; 311 is the feeding end face; 312 is the contour surface; 313 is the groove; 400 is the cooling mechanism; 410 is the sleeve; 411 is the sleeve body; 412 is the boss; 420 is the high-pressure cooling pipe; 430 is the cooling cavity; 500 is the feeding mechanism; 511 is the main channel; 512 is the feeding channel. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] like Figures 1 to 7 As shown, this embodiment proposes a die-casting mold for a housing 10, which can be applied to fields such as electronics and automobiles. It includes a body 11 with an opening and a flange 12 extending from the opening in a direction away from the body 11. The body 11 forms the main structure of the housing 10, and the flange 12 is used for subsequent assembly of the housing 10. It has high requirements for dimensional accuracy and structural integrity. The product cavity sidewall of the housing 10 is provided with a non-undercut structure area, which provides a basis for the arrangement of the auxiliary slider 310.

[0032] The die-casting mold includes: a moving mold assembly 100, a fixed mold assembly 200, a slider mechanism 300, a cooling mechanism 400, and a feeding mechanism 500.

[0033] Specifically, the moving mold assembly 100 and the fixed mold assembly 200 are movably pressed together, and when the mold is closed, the two form the basic mold closing structure.

[0034] When the mold is opened, the moving mold assembly 100 moves away from the fixed mold assembly 200, providing a basis for the demolding of the shell 10.

[0035] The slider mechanism 300 is disposed on the moving mold assembly 100 and cooperates with the moving mold assembly 100 to realize movement and reset.

[0036] When the moving mold assembly 100 and the fixed mold assembly 200 are pressed together, a product cavity for molding the housing 10 is formed between the moving mold assembly 100, the fixed mold assembly 200 and the slider mechanism 300.

[0037] The shape of the product cavity is perfectly matched with the external structure of the housing 10, ensuring the molding accuracy of the housing 10.

[0038] In addition, the die-casting mold also includes an ejection mechanism. The ejection mechanism is an existing technology structure and is not the focus of this solution, so it will not be described in detail here.

[0039] The slider mechanism 300 includes an auxiliary slider 310 and a hydraulic cylinder. The auxiliary slider 310 is arranged on the side wall of the product cavity without an undercut structure, serving as a dedicated feeding auxiliary structure for the product cavity.

[0040] The hydraulic cylinder is fixedly mounted on the moving mold assembly 100, providing precise power drive for the auxiliary slider 310, enabling the sliding, positioning and resetting of the auxiliary slider 310, and ensuring the motion accuracy and working stability of the auxiliary slider 310.

[0041] The auxiliary slider 310 is slidably engaged with the moving mold assembly 100. The auxiliary slider 310 has a feeding end face 311 facing the fixed mold assembly 200 and a contoured surface 312 facing the product cavity.

[0042] The feeding end face 311 provides a stable mounting and fitting base for the feeding mechanism 500, and the contour surface 312 is completely fitted with the outer surface of the housing 10 to ensure the forming accuracy of the outer contour of the housing 10.

[0043] The contoured surface 312 is provided with a groove 313, which is used to form at least a partial structure of the flange 12. The shape and size of the groove 313 are adapted to the partial structure of the flange 12 to ensure the forming quality of the flange 12.

[0044] Meanwhile, when the fixed mold assembly 200 separates from the housing 10, the groove 313 provides a force to the flange 12 in the same direction as the moving mold assembly 100, preventing the flange 12 from sticking to the fixed mold assembly 200, effectively preventing the flange 12 from being damaged or deformed during demolding, and ensuring smooth demolding.

[0045] Furthermore, the draft angle of the groove 313 is 1°-3°, and the direction of the draft angle is consistent with the mold opening direction of the moving mold assembly 100. This draft angle design not only ensures the forming dimensional accuracy of the flange 12, but also effectively reduces the friction between the flange 12 and the groove 313, further improving the smoothness of demolding.

[0046] Furthermore, the inner wall and bottom surface of the groove 313 are both polished mirror surface, and the side wall of the groove 313 is also polished mirror surface. The polishing mirror surface treatment can reduce the fitting resistance between the flange 12 and the groove 313, avoid sticking to the mold, and at the same time ensure the surface smoothness of the flange 12 after molding.

[0047] The fixed mold assembly 200 includes a core 210 extending into the product cavity. The core 210 is used to form the inner cavity of the body 11. The shape of the core 210 is adapted to the inner cavity structure of the body 11 of the housing 10 and is a key component for forming the inner cavity of the housing 10.

[0048] The core 210 has a cooling hole 211 inside, which provides installation space for the cooling mechanism 400 and enables precise cooling of the core 210.

[0049] The cooling mechanism 400 includes a sleeve 410 inserted into the cooling hole 211 and a high-pressure cooling pipe 420 disposed in the sleeve 410.

[0050] The high-pressure cooling pipe 420 is an integral hollow tubular structure with a stepped shape. It includes a connecting section, an installation section, and a water outlet section that are coaxially connected in sequence. The connecting section is located outside the sleeve 410 and has external threads on its outer wall for threaded sealing connection with the quick-connect fitting of the external coolant circulation system, ensuring no leakage during coolant transportation.

[0051] The mounting section is adapted to the inner wall of the sleeve 410, and a gap is left between its outer wall and the inner wall of the sleeve 410 for coolant return. The length of the mounting section matches the length of the sleeve body 411 to ensure the installation stability of the high-pressure cooling pipe 420 in the sleeve 410.

[0052] The water outlet section is the end of the high-pressure cooling pipe 420. Its diameter is smaller than that of the installation section. The length of the water outlet section is precisely designed so that the water outlet at its end can extend to the cooling cavity 430, ensuring that the coolant can be directly delivered to the bottom wall of the cooling hole 211, which is a key area for cooling the core 210.

[0053] The interior of the high-pressure cooling pipe 420 is a coolant inlet channel, and the exterior forms a coolant return channel with the sleeve 410. The inlet channel and the return channel are independent of each other and together constitute a closed cooling circuit within the sleeve 410.

[0054] The coolant enters through the inlet channel of the high-pressure ignition pipe 420, and after being discharged from the outlet, it flows back to the external coolant circulation system along the return channel, realizing the recycling of the coolant. The high-pressure design of the high-pressure ignition pipe 420 can increase the flow rate of the coolant in the inlet channel, enabling the coolant to be delivered to the cooling cavity 430 quickly and accurately.

[0055] A cooling cavity 430 is formed between the end of the sleeve 410 and the bottom wall of the cooling hole 211, and the outlet of the high-pressure cooling pipe 420 extends into the cooling cavity 430.

[0056] In the existing cooling structure of the core 210, the outlet of the cooling pipe is not extended, and the distance between it and the bottom wall of the cooling hole 211 is relatively long. The coolant cannot form an effective cooling circuit in the cooling hole and can only flow along the inner wall of the sleeve 410. Since there is no direct contact between the coolant and the bottom wall area of ​​the cooling hole 211, the heat exchange efficiency is extremely low, which becomes a cooling dead zone of the core 210. As a result, the cooling speed of the bottom wall area of ​​the core 210 is much slower than that of other areas. The core 210 is cooled unevenly as a whole, which in turn causes the shell 10 to warp and deform due to the difference in thermal contraction.

[0057] The cooling cavity 430 in this design creates an independent coolant contact space in the bottom wall area of ​​the core 210. Simultaneously, the outlet of the high-pressure ignition pipe 420 extends into this cooling cavity 430. After the coolant enters the cooling cavity 430 from the outlet of the high-pressure ignition pipe 420, it forms a swirling diffusion within the cooling cavity 430, quickly filling the entire cooling cavity 430. This allows the coolant to achieve comprehensive and direct contact with the bottom wall of the cooling hole 211, significantly increasing the cooling area of ​​the bottom wall region of the cooling hole 211 and transforming the original cooling dead zone into a cooling area where the coolant can fully contact the surface.

[0058] At the same time, the swirling motion of the high-pressure coolant in the cooling cavity 430 will continuously scour the bottom wall of the cooling hole 211, accelerate the heat conduction speed of the bottom wall area of ​​the core 210, and make the cooling speed of the bottom wall area of ​​the core 210 consistent with that of other areas of the core 210, thus completely solving the problem of uneven cooling of the core 210 and preventing the shell 10 from warping or deforming due to uneven thermal shrinkage.

[0059] Furthermore, the distance between the end of the sleeve 410 and the bottom wall of the cooling hole 211 is 40%-50% of the thickness of the bottom wall of the cooling hole 211 to the end of the core 210 facing the moving mold assembly 100.

[0060] This distance ratio design ensures that the cooling range of the cooling cavity 430 is precisely matched with the heat conduction area of ​​the bottom wall of the core 210. If the distance is too small, the volume of the cooling cavity 430 will be insufficient, and the coolant will not be able to form an effective swirling flow, thus reducing the cooling area and heat exchange efficiency. If the distance is too large, the flow rate of the coolant in the cooling cavity 430 will be greatly reduced, the swirling effect will be weakened, and the cooling efficiency will also be affected. A ratio of 40%-50% can take into account the volume of the cooling cavity 430, the swirling effect of the coolant, and the heat exchange efficiency, achieving the optimal cooling effect in the bottom wall area of ​​the core 210.

[0061] The cooling hole 211 has a countersunk hole at one end away from the moving mold assembly 100; the sleeve 410 includes a sleeve body 411 and a boss 412, the boss 412 being adapted to the countersunk hole; when the sleeve 410 is installed to the core 210, the sleeve body 411 is inserted into the cooling hole 211 and a sealing ring is provided between them.

[0062] The sealing ring ensures the seal between the sleeve body 411 and the cooling hole 211, preventing coolant leakage. The boss 412 is inserted into the countersunk hole. The cooperation between the countersunk hole and the boss 412 enables the sleeve 410 to be accurately positioned and assembled, ensuring the assembly accuracy of the cooling mechanism 400 and avoiding uneven cooling due to sleeve 410 offset.

[0063] The sleeve 410 is fixed to the cooling hole 211 by welding. Welding can ensure the connection strength and sealing of the sleeve 410 and the cooling hole 211, and prevent the sleeve 410 from loosening or displacing under the high pressure impact of the coolant.

[0064] Furthermore, the mounting section of the high-pressure cooling pipe 420 is threadedly connected to the inner wall of the sleeve 410. The threaded connection enables the high-pressure cooling pipe 420 to be disassembled and assembled, facilitating subsequent maintenance and replacement of the high-pressure cooling pipe 420.

[0065] The connection section of the high-pressure cooling pipe 420 is connected to the external coolant circulation system via a quick-connect coupling. The quick-connect coupling enables the high-pressure cooling pipe 420 to be quickly connected and disconnected from the coolant circulation system, improving the maintenance efficiency of the mold while ensuring the sealing of the connection and preventing coolant leakage.

[0066] The feeding mechanism 500 includes a main channel 511 disposed between the feeding end face 311 and the fixed mold assembly 200, and a feeding channel 512 connecting the main channel 511 and the product cavity.

[0067] Molten metal is injected into the main channel 511 through an external die-casting machine, and then flows into the product cavity through the feed channel 512 to complete the die-casting of the shell 10.

[0068] The feed channel 512 extends to the contour surface 312 of the auxiliary slider 310 and is arranged in the direction from the fixed mold assembly 200 to the moving mold assembly 100. With the help of the auxiliary slider 310 driven by the hydraulic cylinder, the feed direction of the product cavity is parallel to the thickness direction of the shell 10.

[0069] This feeding direction design allows molten metal to be smoothly injected into the cavity along the thickness direction of the shell 10, avoiding strong impact on local areas of the cavity, effectively preventing defects such as erosion and shrinkage of the shell 10, while ensuring uniform filling of molten metal in all areas of the shell 10, thus improving the molding quality of the shell 10.

[0070] Furthermore, the feed channel 512 includes a stepped flared section, with the larger end of the stepped flared section facing the main flow channel 511 and the smaller end connecting to the product cavity. The cross-sectional area of ​​the stepped flared section gradually decreases from the main flow channel 511 to the feed inlet. The stepped flared section is used to reduce the flow rate of molten metal into the product cavity, so that the molten metal enters the cavity smoothly, reducing turbulence and air entrapment. At the same time, it effectively reduces the impact of molten metal on the forming area of ​​the flange 12, preventing the flange 12 from deforming or having uneven wall thickness due to impact, and ensuring the forming accuracy of the flange 12.

[0071] The die-casting mold also includes an exhaust assembly, which includes an exhaust groove disposed between the auxiliary slider 310 and the fixed mold assembly 200, and an exhaust channel formed between the auxiliary slider 310 and the moving mold assembly 100.

[0072] The exhaust channel added by the auxiliary slider 310 driven by the hydraulic cylinder and the moving mold assembly 100 forms a multi-path exhaust structure with the original exhaust groove, which greatly increases the exhaust efficiency of the product cavity. The exhaust groove and the exhaust channel together provide an exhaust channel for the cavity gas, avoiding the formation of porosity defects caused by gas residue in the cavity.

[0073] The venting groove extends along the contact surface between the auxiliary slider 310 and the fixed mold assembly 200, and the venting channel extends along the sliding mating surface between the auxiliary slider 310 and the moving mold assembly 100. The venting groove and the venting channel are connected and jointly connected to the venting block provided on the moving mold assembly 100.

[0074] The extension direction of the venting groove and venting channel is adapted to the flow direction of gas in the cavity, which can quickly collect and discharge residual gas in various areas of the cavity; wherein, the venting block is connected to an external vacuum device through a vacuum valve, which is used to actively discharge the cavity gas during the mold closing stage. Compared with the traditional single venting structure, the multi-path venting combined with the active vacuum design of this mold can significantly improve the venting efficiency, maximize the discharge of gas inside the cavity, effectively avoid the occurrence of air hole defects after the shell 10 is formed, and further improve the forming qualification rate of the shell 10.

[0075] The workflow of the die-casting mold for the housing 10 in this embodiment is as follows: During the mold closing stage: The hydraulic cylinder drives the auxiliary slider 310 to slide precisely along the moving mold assembly 100 to the designated position of the product cavity without undercut sidewalls. Then, the moving mold assembly 100 moves towards the fixed mold assembly 200 until the moving mold assembly 100 and the fixed mold assembly 200 are in close contact. A product cavity that is adapted to the structure of the housing 10 is formed between the moving mold assembly 100, the fixed mold assembly 200 and the auxiliary slider 310. At the same time, the vacuum valve connected to the exhaust block is opened. The external vacuum pump actively discharges the gas in the cavity through the exhaust block, the exhaust groove and the exhaust channel between the auxiliary slider 310 and the moving mold assembly 100. The multi-path exhaust structure realizes the rapid discharge of gas in the cavity and ensures the vacuum degree in the cavity.

[0076] Die casting stage: The external die casting machine injects molten metal into the main channel 511. After being decelerated by the stepped flaring section, the molten metal extends along the feed channel 512 to the contour surface 312 of the auxiliary slider 310. With the help of the feed assistance of the auxiliary slider 310, which is precisely positioned by the hydraulic cylinder, it flows smoothly into the product cavity along the direction parallel to the thickness of the shell 10. The molten metal smoothly fills the entire cavity without strong impact or turbulence. During the filling process, the small amount of gas remaining in the cavity is continuously discharged through the exhaust groove, the exhaust channel between the auxiliary slider 310 and the moving mold assembly 100 to avoid air entrapment.

[0077] Cooling Stage: The external coolant circulation system delivers high-pressure coolant to the connection section of the high-pressure ignition pipe 420 via a quick-connect coupling. The coolant is rapidly delivered to the outlet section through the inlet channel of the high-pressure ignition pipe 420 and discharged into the cooling cavity 430 in the form of a diffused flow from the obliquely cut outlet. The high-pressure coolant forms a swirling flow within the cooling cavity 430 and quickly fills the entire cooling cavity 430, achieving full and direct contact with the bottom wall of the cooling hole 211. Through heat exchange, it quickly removes heat from the bottom wall area of ​​the core 210. Subsequently, the coolant flows back to the external coolant circulation system along the return channel between the installation section of the high-pressure ignition pipe 420 and the inner wall of the sleeve 410, forming a closed cooling loop. The cooling cavity 430 increases the cooling area of ​​the bottom wall of the core 210. The high-pressure delivery and diffused water outlet design of the high-pressure ignition pipe 420 accelerates the heat conduction speed, making the cooling speed of each area of ​​the core 210 uniform. The shell 10 cools and shrinks uniformly within the cavity without warping or deformation.

[0078] Mold opening and demolding stage: The moving mold assembly 100 moves away from the fixed mold assembly 200, completing the separation of the moving mold assembly 100 from the fixed mold assembly 200. Then, the hydraulic cylinder drives the auxiliary slider 310 to move, realizing the separation of the auxiliary slider 310 from the housing 10. After the above separation action is completed, the housing 10 is ejected from the mold by the ejection mechanism of the die-casting mold, completing the demolding operation.

[0079] Cyclic operation: After demolding, the moving mold assembly 100 is reset, and the hydraulic cylinder drives the auxiliary slider 310 to accurately return to the initial position along with the moving mold assembly 100. After mold closing, the next round of die casting operation begins, and the cycle continues to achieve large-scale continuous production of the shell 10.

[0080] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0082] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A die casting mold for a housing, comprising: A movable die assembly, a fixed die assembly, a slider mechanism, a cooling mechanism and a feeding mechanism; the movable die assembly and the fixed die assembly are movably abutted; The slider mechanism is arranged on the movable die assembly; when the movable die assembly and the fixed die assembly are abutted, a product cavity for forming the shell is formed among the movable die assembly, the fixed die assembly and the slider mechanism; characterized in that: The slider mechanism comprises an auxiliary slider, the auxiliary slider has a feeding end face facing the fixed die assembly and a profiling face facing the product cavity; The fixed die assembly comprises a core extending into the product cavity, the core is used for forming an inner cavity of the shell, and the core is internally provided with a cooling hole; The cooling mechanism comprises a sleeve inserted into the cooling hole and a high-pressure point cooling pipe arranged in the sleeve, the high-pressure point cooling pipe is used for forming a cooling loop in the sleeve; wherein, The end of the sleeve and the bottom wall of the cooling hole form a cooling cavity, the water outlet of the high-pressure point cooling pipe extends into the cooling cavity, and the cooling cavity is used for increasing the cooling area of the bottom wall region of the cooling hole; The feeding mechanism comprises a main flow channel arranged between the feeding end face and the fixed die assembly and a feeding channel communicating the main flow channel and the product cavity; wherein, The feeding channel extends to the profiling face of the auxiliary slider and is arranged along the direction of the fixed die assembly pointing to the movable die assembly, so as to make the feeding direction of the product cavity parallel to the thickness direction of the shell.

2. A die casting mould for a housing as claimed in claim 1, characterized in that The shell comprises a body with an opening and a flange extending in a direction away from the body at the opening; the profiling face is provided with a groove; wherein, The groove is used for forming at least a partial structure of the flange and providing the flange with an acting force in the same direction as the movable die assembly when the fixed die assembly is separated from the shell.

3. A die casting mold for a housing according to claim 1, wherein Further comprising an exhaust assembly; wherein, the exhaust assembly at least comprises an exhaust groove arranged between the auxiliary slider and the fixed die assembly.

4. A die casting mould for a housing as claimed in claim 1, characterized in that: The end of the cooling hole away from the movable die assembly is provided with a counterbore; the sleeve comprises a sleeve body and a boss, the boss is matched with the counterbore; wherein, when the sleeve is installed to the core, the sleeve body is inserted into the cooling hole and a sealing ring is arranged therebetween, and the boss is inserted into the counterbore.

5. A die casting mold for a housing according to claim 2, wherein The distance between the end of the sleeve and the bottom wall of the cooling hole is 40%-50% of the thickness of the end of the core facing the movable die assembly.

6. A die casting mold for a housing according to claim 2, wherein The feeding channel comprises a stepped flared section, the large end of the stepped flared section faces the main flow channel, and the small end is connected to the product cavity; wherein, The stepped flared section is used for reducing the flow rate of the molten metal flowing to the product cavity and reducing the impact on the forming area of the flange.

7. A die casting mold for a housing according to claim 3, wherein The exhaust groove extends along the contact surface of the auxiliary slider and the fixed die assembly and is communicated to an exhaust block arranged on the movable die assembly; wherein, The exhaust block is connected to an external vacuum pumping device through a vacuum valve, and is used for actively exhausting the cavity gas in the clamping stage.

8. A die casting mold for a housing according to claim 2, wherein The draft angle of the groove is 1°-3°, and the direction of the draft angle is consistent with the mold opening direction of the moving mold assembly; and the inner wall and bottom surface of the groove are both polished mirror surface, and the side wall of the groove is also polished mirror surface.

9. A die casting mold for a housing according to claim 1, wherein The sleeve is fixed to the cooling hole by welding, and the high-pressure cooling pipe is threadedly connected to the sleeve.

10. A die casting mold for a housing according to claim 1, wherein The high-pressure cooling pipe is connected to the external coolant circulation system via a quick-connect coupling.

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