Injection mold, injection product demolding method and household appliance shell

Abstract

The application provides an injection mold, an injection product demolding method and a household appliance shell, relates to the injection product forming technical field, and the injection mold, the injection product demolding method and the household appliance shell are provided, when the mold is opened, a deformation space located in a cavity is first formed, then when the product reverse buckle and the first mold are extruded during the moving away of the first mold and the second mold, the product reverse buckle is elastically deformed towards the deformation space, so that the product is forced to be separated from the first mold. The application realizes the forced demolding of the product, and is especially suitable for the injection product with complex local structure, such as a household appliance shell, and the injection mold of the injection product is difficult to be additionally provided with a lateral parting mechanism.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and more specifically, to injection molds, methods for demolding injection molded products, and appliance housings. Background Technology

[0002] The outer casing of home appliances has a relatively complex structure and is generally formed using injection molding. For example... Figure 5 As shown, a type of appliance casing has a cylindrical extension with undercuts formed on the outer wall of the extension. Because the special structure on this appliance casing is relatively concentrated, it is difficult to arrange additional lateral parting mechanisms on the mold for demolding the undercut portions. Therefore, achieving product demolding becomes a challenge. Summary of the Invention

[0003] This application provides injection molds, demolding methods for injection molded products, and appliance housings, aiming to solve the problem of difficult demolding of the undercut parts of products.

[0004] In a first aspect, this application provides an injection mold for injection molding of a product, the product having an extension extending in a first direction, and an undercut formed on the outer side wall of the extension.

[0005] The mold includes a first mold, a second mold, a core, and a sequential mold-separating mechanism;

[0006] The first mold and the second mold are arranged sequentially along a first direction and can move away from each other. The core extends between the first mold and the second mold. The first mold, the second mold and the core enclose a cavity for molding a product. The first mold is used to form an undercut on the extension, and the core is used to form the inner wall of the extension facing away from the undercut.

[0007] During mold opening, the sequential mold separating mechanism is used to drive the core to move relative to each other to a clearance position, thereby clearing deformation space in the cavity, and then causing the first mold and the second mold to move away from each other.

[0008] During the process of the first mold and the second mold moving away from each other, the extension formed by the cavity can move together with the second mold, and when the part with the undercut is pressed against the first mold, the part with the undercut elastically deforms into the deformation space, thereby separating from the first mold.

[0009] The core is movable along the first direction and extends between the first mold and the second mold.

[0010] In some embodiments of this application, the sequential mold-separating mechanism includes:

[0011] A substrate is connected to either the first mold or the second mold on opposite sides of each other. A core is fixed on the substrate and passes through the first mold or the second mold closest to the substrate. The substrate is capable of moving away from the first mold and the second mold in a first direction to move the core to the clearance position.

[0012] A limiting structure is provided to restrict the movement of the one of the first molds and the second molds closest to the substrate away from each other along a first direction when the cores move relative to each other to an avoidance position.

[0013] In some embodiments of this application, the limiting structure includes:

[0014] A stepped hole is provided on one of the first mold and the second mold that is closer to the substrate, with the smaller end of the stepped hole facing the substrate;

[0015] A limiting member, one end of which is fixed to the substrate, and the other end of which passes through the stepped hole. The limiting member forms a limiting part at the larger end of the stepped hole. The limiting part is used to abut against the stepped surface of the stepped hole when the core moves to the avoidance position.

[0016] In some embodiments of this application, the sequential mold-separating mechanism includes:

[0017] An elastic element is disposed between the first mold and the second mold, which is closer to the substrate and the substrate, so that the two tend to move away from each other.

[0018] In some embodiments of this application, the sequential mold-separating mechanism includes:

[0019] An opener / closer is configured to keep the first mold and the second mold in a closed state before the core moves to the avoidance position.

[0020] In some embodiments of this application, the first mold and the second mold near the substrate are provided with a positioning inner cone surface, the positioning inner cone surface facing the substrate, and the core is formed with a positioning outer cone surface, the positioning inner cone surface and the positioning outer cone surface being fitted together.

[0021] In some embodiments of this application, the mold further includes a guide structure, which includes a guide post, a first guide sleeve, and a second guide sleeve. The guide post is fixedly disposed on the substrate and extends along the first direction. The first guide sleeve is disposed on the first mold, and the second guide sleeve is disposed on the second mold. The guide post passes through the first guide sleeve and the second guide sleeve, and the guide post slides in cooperation with the first guide sleeve and the second guide sleeve, respectively.

[0022] Secondly, this application also provides a home appliance housing, which is manufactured using an injection mold as described in the first aspect, wherein the extension is a pipe on the home appliance housing, and the undercut is an annular undercut formed on the outer wall of the pipe.

[0023] Thirdly, this application also provides a method for demolding an injection-molded product, the product having an extension extending along a first direction, and an undercut formed on the outer side wall of the extension, the demolding method comprising the steps of:

[0024] A first mold, a second mold, and a core are provided to enclose a cavity for forming the product, wherein the first mold is used to form the undercut, and the core is used to form the inner wall of the extension facing away from the undercut;

[0025] Remove the core to create a deformation space within the cavity that allows for elastic deformation of the portion of the extension with the undercut.

[0026] The first mold and the second mold are moved away from each other along the first direction to open the mold;

[0027] During the mold opening process, the extension moves together with the second mold, and when the part of the extension with the undercut is pressed against the first mold, the part of the extension with the undercut elastically deforms into the deformation space, thereby separating from the first mold.

[0028] The injection mold, injection molded product demolding method, and appliance housing provided in this application first form a deformation space within the cavity during mold opening. Then, during the process of the first mold and the second mold moving away from each other, the product's undercut presses against the first mold, causing the undercut to elastically deform towards the deformation space, thereby forcibly detaching from the first mold. This application achieves forced demolding of the product, and is particularly suitable for injection molded products with complex local structures, such as appliance housings, where the space in the suitable injection mold is limited and it is difficult to install a side parting mechanism. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the injection mold when it is closed in Embodiment 1 of this application. At this time, the core, the first mold and the second mold enclose the cavity.

[0031] Figure 2 This is a schematic diagram of the structure of the injection mold in Embodiment 1 provided in this application when the mold is opened. At this time, the product has been formed by the cavity, the core has moved to the avoidance position, and the first mold and the second mold have not separated.

[0032] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0033] Figure 4 This is a schematic diagram of the structure of the injection mold when it is opened in Embodiment 1 of this application. At this time, the core moves to the clearance position, the first mold and the second mold have separated, and the product is separated from the first mold along with the second mold.

[0034] Figure 5 This is a schematic diagram of the structure of the appliance casing that the injection mold is used to form in Embodiment 1 of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-First mold, 11-Positioning inner conical surface, 12-First guide sleeve;

[0037] 2-Second mold, 21-Second guide sleeve;

[0038] 3-Core, 31-Positioning outer conical surface;

[0039] 41-Substrate; 42-Stepped hole; 421-Stepped surface; 43-Limiting member; 44-Elastic member; 45-Opener / closer; 46-Guide post;

[0040] 5-Cavity, 51-Deformation space;

[0041] 6-Product, 61-Extension, 62-Undercut. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and comprehensively described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, known structures and processes are not described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and characteristics disclosed in this application.

[0045] Example 1

[0046] The main component of this embodiment is an injection mold, which is used to mold the injection-molded product 6.

[0047] Please see Figure 5 , Figure 5 This is a structural schematic diagram of an embodiment of product 6, which has an extension 61 extending along a first direction, and an undercut 62 formed on the outer side wall of the extension 61. It should be noted that... Figure 5The injection molded product 6 shown is merely a structural schematic diagram of an injection molded product provided to facilitate understanding of the injection mold in this application, and does not limit the injection mold provided in this application to only be used to mold products with the structure shown in product 6.

[0048] Please see Figure 1 The schematic diagram of the injection mold during mold closing in Example 1 shows that the mold includes a first mold 1, a second mold 2, a core 3, and a sequential mold parting mechanism.

[0049] The first mold 1 and the second mold 2 are arranged sequentially along a first direction and can move away from each other. The core 3 extends between the first mold 1 and the second mold 2. The first mold 1, the second mold 2 and the core 3 enclose a cavity 5 for molding the product 6. The first mold 1 is used to mold the undercut 62 on the extension 61, and the core 3 is used to mold the inner wall of the extension 61 facing away from the undercut 62.

[0050] During mold opening, the sequential mold separating mechanism is used to drive the core 3 to move relative to each other to a clearance position, thereby clearing the deformation space 51 in the cavity 5, and then causing the first mold 1 and the second mold 2 to move away from each other.

[0051] During the process of the first mold 1 and the second mold 2 moving away from each other, the extension 61 formed by the cavity 5 can move together with the second mold 2, and when the part with the undercut 62 is pressed against the first mold 1, the part with the undercut 62 elastically deforms into the deformation space 51, thereby separating from the first mold 1.

[0052] During injection molding, the molding material enters the cavity 5, which conforms to the shape of product 6, and after cooling, product 6 is formed. Mold opening is performed in two steps using a sequential parting mechanism. Please refer to [link / reference]. Figure 2 and Figure 3 The diagram below illustrates the structure of the injection mold during mold opening in Example 1. At this time, under the action of the injection molding machine's mold opening force, the first mold 1 and the second mold 2 move, while the core 3, driven by the sequential mold parting mechanism, remains stationary and thus moves relative to each other to a clearance position. The space originally occupied by the core 3 within the cavity 5 is released, i.e., the deformation space 51 is cleared. Then, with the continuous action of the mold opening force, the first mold 1 and the second mold 2 move away from each other, thus completely opening the mold.

[0053] Please see Figure 3 and Figure 4Since the first mold 1 is used to form the undercut 62 on the extension 61, its parting surface will have a groove with a complementary shape to the undercut 62. After the product 6 is injection molded, the undercut 62 is embedded in the groove. The movement of the first mold 1 and the second mold 2 away from each other will cause the undercut 62 and the groove to press against each other. At this time, the extension 61 can elastically deform the part with the undercut 62 into the deformation space 51, thereby separating from the first mold 1 and achieving forced demolding.

[0054] The injection mold provided in this embodiment utilizes a sequential parting mechanism to achieve sequential mold separation. During mold opening, a deformation space 51 is first formed within the cavity 5. Then, as the first mold 1 and the second mold 2 move away from each other, the undercut 62 of the product 6 presses against the first mold 1, causing the undercut 62 of the product 6 to elastically deform towards the deformation space 51, thereby forcibly separating the product 6 from the first mold 1 along a first direction. This embodiment achieves forced demolding of the product 6. The injection mold provided in this embodiment is particularly suitable for injection molded products with complex local structures, such as appliance casings, where the space of the suitable injection mold is limited, making it difficult to install a side parting mechanism.

[0055] Also, please see again Figure 5 In this embodiment, the product 6 is specifically an appliance casing, the extension 61 is a pipe on the appliance casing, and the buckle 62 is an annular buckle formed at the end of the outer wall of the pipe. The outer wall mentioned above refers to the part located between the two ends of the extension 61 along its extension direction and forming the outer wall of the side of the extension 61, while the inner wall refers to the part located between the two ends of the extension 61 along its extension direction and forming the inner wall of the side of the extension 61.

[0056] More specifically, in this embodiment, the first direction is horizontal, the first mold 1 is the front mold, and the second mold 2 is the rear mold. The implementer can also adjust the first direction to a vertical direction according to their needs. It can be understood that the first direction is both the extension direction of the product 6 extension 61 and the opening and closing direction of the first mold 1 and the second mold 2.

[0057] The relative movement direction of the core 3 can be set according to the structural shape of the product 6. For example, in another embodiment, the product 6 is a semi-circular plate with its axis extending along the first direction, and the undercut 62 is a protrusion formed on the outer wall of the product 6. In this case, the core 3 can move relative to the product 6 along a second direction perpendicular to the first direction, thereby separating it from the formed product 6.

[0058] In this embodiment, to avoid the core 3 using a lateral moving mechanism and further occupying the already limited space of the mold, the core 3 can extend movably along the first direction between the first mold 1 and the second mold 2.

[0059] In this embodiment, during mold opening, the second mold 2 covers a portion of the product 6. That is, during the movement of the first mold 1 and the second mold 2 in opposite directions, the product 6 remains attached to and held on the second mold 2. The implementer can also adjust the adhesion between the product 6 and the first mold 1 and the second mold 2 to ensure that the product 6 remains attached to and held on the second mold 2 during the movement of the first mold 1 and the second mold 2 in opposite directions.

[0060] Please see Figures 1 to 4 In this embodiment, the sequential mold-separating mechanism includes:

[0061] A substrate 41 is connected to either the first mold 1 or the second mold 2 on opposite sides of each other. A core 3 is fixed on the substrate 41 and passes through the first mold 1 or the second mold 2 closest to the substrate 41. The substrate 41 is capable of moving away from the first mold 1 and the second mold 2 in a first direction so that the core 3 can move to the avoidance position.

[0062] A limiting structure is provided to restrict the movement of the one closer to the substrate 41 in the first mold 1 and the second mold 2 away from each other in a first direction when the core 3 moves to a clearance position.

[0063] The substrate 41 can be disposed on the side of the first mold 1 facing away from the second mold 2, or the second mold 2 facing away from the first mold 1. After the position of the substrate 41 is determined, the core 3 passes through the one of the first mold 1 and the second mold 2 closest to the substrate 41, extending between the first mold 1 and the second mold 2. In this embodiment, the substrate 41 is disposed outside the side of the first mold 1 facing away from the second mold 2.

[0064] During mold opening, under the action of the injection molding machine's mold opening force, the first mold 1 and the second mold 2 first move away from the base plate 41, so that the core 3 moves relative to each other to the clearance position. During this process, the base plate 41 remains relatively stationary. When the core 3 moves relative to each other to the clearance position, the limiting structure restricts the first mold 1 and the base plate 41 from continuing to move away from each other along the first direction. At this time, the base plate 41 pulls the first mold 1, causing the first mold 1 and the second mold 2 to separate from each other, thereby achieving sequential mold separation.

[0065] More specifically, in this embodiment, the limiting structure includes:

[0066] A stepped hole 42 is provided on one of the first mold 1 and the second mold 2 near the substrate 41, with the smaller end of the stepped hole 42 facing the substrate 41;

[0067] The limiting member 43 has one end fixed to the substrate 41 and the other end inserted into the stepped hole 42. The limiting member 43 is inserted into the larger end of the stepped hole 42 to form a limiting part. The limiting part is used to abut against the stepped surface 421 of the stepped hole 42 when the core 3 moves to the avoidance position.

[0068] Please see Figure 2 In this embodiment, the stepped hole 42 is specifically disposed on the first mold 1, and the limiting member 43 is specifically a height equalizing bolt. The threaded end of the height equalizing bolt is threadedly connected to the threaded hole on the base plate 41 to achieve fixation between the two, while its head extends into the larger end of the stepped hole 42, and is used to abut against the stepped surface 421 when the core 3 moves to the avoidance position.

[0069] The implementer can choose the specific limiting structure according to their own needs. For example, in another embodiment, the limiting structure is a groove provided on the first mold 1 and a hook provided on the substrate 41. The hook is used to engage with the closed end of the groove when the core 3 moves to the avoidance position, thereby restricting the first mold 1 and the substrate 41 from moving away from each other.

[0070] Furthermore, during the process of core 3 being extracted from cavity 5, core 3 needs to overcome the adhesive force from the inner wall of product 6. Relying solely on the injection molding machine to pull the second mold 2 may cause scratches on the inner wall of product 6. Therefore, to enable core 3 to be extracted more smoothly, in this embodiment, the sequential mold parting mechanism includes an elastic element. The elastic element is disposed between the first mold 1 and the second mold 2 closest to the substrate 41 and the substrate 41, so that the two tend to move away from each other. The elastic element can share some of the adhesive force that core 3 needs to overcome, thereby enabling core 3 to be extracted from product 6 more smoothly.

[0071] In this embodiment, the elastic element is specifically a compression spring disposed between the first mold 1 and the substrate 41. The two ends of the compression spring abut against the first mold 1 and the substrate 41 respectively, so as to apply an elastic force to both of them to make them move in opposite directions.

[0072] Please see Figure 1In this embodiment, during mold opening, the injection molding machine acts on the second mold 2 to move it relative to the substrate 41. To ensure that the first mold 1 and the second mold 2 do not separate prematurely, in this embodiment, the sequential mold-separating mechanism includes an opening / closing device 45. The opening / closing device 45 is configured to keep the first mold 1 and the second mold 2 in a closed state before the core 3 moves to the clearance position. In this embodiment, the opening / closing device 45 is specifically a resin opening / closing device, which is mainly used to increase the mold-separating resistance between the first mold 1 and the second mold 2, so that after the core 3 moves to the clearance position and the limiting structure restricts the movement of the first mold 1 and the substrate 41 away from each other, the first mold 1 and the second mold 2 can separate under the action of the mold-separating force.

[0073] The aforementioned resin opener / closer is a mature existing technology in the field of injection mold technology; therefore, its structure and principle will not be elaborated further. Furthermore, implementers can choose other openers / closers, such as mechanical openers / closers or magnetic openers, to replace the aforementioned resin opener / closer according to their own needs.

[0074] In this embodiment, the substrate 41 is specifically a hot runner plate, on which a hot runner is provided that is connected to the cavity 5 when the mold is closed.

[0075] In addition, in this embodiment, the mold also includes a guide structure, please refer to [link / reference]. Figure 1 and Figure 2 The guiding structure includes a guide post 46, a first guide sleeve 12, and a second guide sleeve 21. The guide post 46 is fixedly disposed on the base plate 41 and extends along the first direction. The first guide sleeve 12 is disposed on the first mold 1, and the second guide sleeve 21 is disposed on the second mold 2. The guide post 46 passes through the first guide sleeve 12 and the second guide sleeve 21, and the guide post 46 slides in cooperation with the first guide sleeve 12 and the second guide sleeve 21, respectively.

[0076] The mold will undergo multiple opening and closing operations throughout its service life, making it crucial to guide the movement of the substrate 51, the first mold 1, and the second mold 2. This embodiment utilizes guide posts 46, a first guide sleeve 12, and a second guide sleeve 21 to guide the movement of the first mold 1 and the second mold 2 away from the substrate 41, as well as their movement away from each other. This prevents misalignment of the substrate 41, the first mold 1, and the second mold 2 during opening and closing, effectively improving the mold's reliability.

[0077] Furthermore, injection molds undergo multiple opening and closing movements during use. Since the core 3 of the injection mold is configured to be movable, it is advisable to position the core 3 after its reset to ensure that it can accurately form the inner wall of the extension 61, thereby improving the product yield. Please refer to [link to relevant documentation]. Figure 1 and Figure 3 In a preferred embodiment, in this embodiment, the first mold 1 and the second mold 2 near the substrate 41 are provided with a positioning inner cone surface 11, the positioning inner cone surface 11 facing the substrate 41, and the core 3 is formed with a positioning outer cone surface 31, the positioning inner cone surface 11 and the positioning outer cone surface 31 are fitted together.

[0078] In this embodiment, a positioning inner cone surface 11 is provided on the part of the first mold 1 facing the substrate 41, and a positioning outer cone surface 31 is provided on the core 3. When the core 3 is in the avoidance position and is ready to be reset, the positioning inner cone surface 11 and the positioning outer cone surface 31, which can fit together, can ensure that the core 3 is accurately reset to its original position, thereby ensuring that the core 3 can accurately form the inner wall of the extension 61 each time it is injected into the injection mold.

[0079] The aforementioned inner conical surface 11 and outer conical surface 31 are mainly used to guide and position the core 3 during its resetting process. This ensures that the core 3 can stably detach from the cavity 5.

[0080] This embodiment also provides a demolding method for injection molded products, wherein the product 6 has an extension 61 extending along a first direction, and an undercut 62 is formed on the outer side wall of the extension 61.

[0081] The demolding method includes the following steps:

[0082] A first mold 1, a second mold 2, and a core 3 are provided to enclose a cavity to form the product 6, wherein the first mold 1 is used to form the undercut 62, and the core 3 is used to form the extension 61 facing away from the inner wall of the undercut 62.

[0083] Remove the core 3 so that a deformation space 51 is formed in the cavity 5, which allows the part of the extension 61 with the undercut 62 to elastically deform;

[0084] The first mold 1 and the second mold 2 are moved away from each other along the first direction to open the mold;

[0085] During the mold opening process, the extension 61 moves together with the second mold 2, and when the part of the extension 61 with the buckle 62 is pressed against the first mold 1, the part of the extension 61 with the buckle 62 is elastically deformed into the deformation space 51, thereby separating from the first mold 1.

[0086] Then, the product 6 is ejected using the ejection mechanism on the second mold 2, and then the robotic arm is used to grab the product 6 for picking and feeding.

[0087] The demolding method for injection molded products provided in this embodiment involves first removing the core 3 during mold opening to form a deformation space 51 within the cavity 5. Then, during the movement of the first mold 1 and the second mold 2 away from each other, when the undercut 62 of the product 6 is pressed against the first mold 1, the undercut 62 of the product 6 elastically deforms towards the deformation space 51, thereby forcibly separating the product 6 from the first mold 1 along a first direction, thus achieving forced demolding of the product 6. The demolding method for injection molded products provided in this embodiment is particularly suitable for injection molded products with complex local structures, such as the casing of household appliances, where the space of the suitable injection mold is limited and it is difficult to install a side parting mechanism.

[0088] The injection mold, injection molded product demolding method, and appliance housing provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An injection mold for injection molding of a product, said product having an extension extending along a first direction, wherein an undercut is formed on the outer side wall of said extension, characterized in that, The mold includes a first mold, a second mold, a core, and a sequential mold-separating mechanism; The first mold and the second mold are arranged sequentially along the first direction and can move in opposite directions. The core extends between the first mold and the second mold, and the first mold, the second mold and the core enclose a cavity for molding the product. The first mold is used to form the undercut on the extension, and the core is used to form the inner wall of the extension facing away from the undercut; The sequential mold-separation mechanism includes a base plate, which is connected to either the first mold or the second mold on opposite sides of each other. The core is fixed on the base plate and passes through the first mold or the second mold closest to the base plate. The base plate is capable of moving away from the first mold and the second mold along the first direction to move the core to an avoidance position. The substrate is a hot runner plate, and is provided with a hot runner that connects to the cavity when the mold is closed; During mold opening, the sequential mold separating mechanism is used to drive the core to move relative to each other to a clearance position, thereby clearing deformation space in the cavity, and then causing the first mold and the second mold to move away from each other. During the process of the first mold and the second mold moving away from each other, the extension formed by the cavity can move together with the second mold, and when the part with the undercut is pressed against the first mold, the part with the undercut elastically deforms into the deformation space, thereby separating from the first mold.

2. The injection mold as described in claim 1, characterized in that, The core is movable along the first direction and extends between the first mold and the second mold.

3. The injection mold as described in claim 2, characterized in that, The sequential mold-separation mechanism includes: A limiting structure is provided to restrict the movement of the one of the first molds and the second molds closest to the substrate away from each other along the first direction when the cores move relative to each other to an avoidance position.

4. The injection mold as described in claim 3, characterized in that, The limiting structure includes: A stepped hole is provided on one of the first mold and the second mold that is closer to the substrate, with the smaller end of the stepped hole facing the substrate; A limiting member, one end of which is fixed to the substrate, and the other end of which passes through the stepped hole. The limiting member forms a limiting part at the larger end of the stepped hole. The limiting part is used to abut against the stepped surface of the stepped hole when the core moves to the avoidance position.

5. The injection mold as described in claim 3, characterized in that, The sequential mold-separation mechanism includes: An elastic element is disposed between the first mold and the second mold, which is closer to the substrate and the substrate, so that the two tend to move away from each other.

6. The injection mold as described in claim 3, characterized in that, The sequential mold-separation mechanism includes: An opener / closer is configured to keep the first mold and the second mold in a closed state before the core moves to the avoidance position.

7. The injection mold as described in claim 3, characterized in that, The first mold and the second mold have a positioning inner cone surface on the one closer to the substrate, the positioning inner cone surface facing the substrate, and a positioning outer cone surface is formed on the core, the positioning inner cone surface and the positioning outer cone surface are fitted together.

8. The injection mold as described in claim 3, characterized in that, The mold further includes a guide structure, which includes a guide post, a first guide sleeve, and a second guide sleeve. The guide post is fixedly disposed on the base plate and extends along the first direction. The first guide sleeve is disposed on the first mold, and the second guide sleeve is disposed on the second mold. The guide post passes through the first guide sleeve and the second guide sleeve, and the guide post slides in cooperation with the first guide sleeve and the second guide sleeve, respectively.

9. A type of appliance casing, characterized in that, The appliance housing is manufactured using an injection mold as described in any one of claims 1 to 8, the extension is a pipe on the appliance housing, and the undercut is an annular undercut formed on the outer wall of the pipe.

10. A method for demolding an injection-molded product, the product having an extension extending along a first direction, wherein an undercut is formed on the outer side wall of the extension, characterized in that, The demolding method includes the following steps: A first mold, a second mold, and a core are provided to enclose a cavity for forming the product, wherein the first mold is used to form the undercut, and the core is used to form the inner sidewall of the extension facing away from the undercut; the core is removed so that a deformation space is formed in the cavity, which allows the portion of the extension with the undercut to elastically deform; The first mold and the second mold are moved away from each other along the first direction to open the mold; During the mold opening process, the extension moves together with the second mold, and when the part of the extension with the undercut is pressed against the first mold, the part of the extension with the undercut elastically deforms into the deformation space, thereby separating from the first mold.

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