A two-color injection mold and method of use

Abstract

The application relates to the technical field of double-color injection molding, and discloses a double-color injection mold and a use method, the double-color injection mold comprising a movable mold, a fixed mold and an exhaust mechanism, wherein the movable mold comprises a core, the fixed mold comprises a first cavity and a second cavity, when the movable mold moves to a first position relative to the fixed mold, the core and the first cavity form a first forming cavity, the first forming cavity is used for pouring a first injection material, so as to form a first injection model in the first forming cavity, when the movable mold moves from the first position to a second position relative to the fixed mold, the core and the first injection model and the second cavity form a second forming cavity, the second forming cavity is used for pouring a second injection material, so as to form a second injection model in the second forming cavity, the exhaust mechanism is arranged on the side of the first cavity opposite to the core, and is used for forming an exhaust part corresponding to the position of the exhaust mechanism of the first injection model, the exhaust part is used for exhausting the gas in the second forming cavity when the second injection material is poured.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of two-color injection molding technology, and in particular to a two-color injection mold and its usage method. Background Technology

[0002] Currently, injection molding technology is characterized by low cost, high production efficiency, and high degree of automation, and is widely used in the production of non-metallic structural parts. In order to improve the aesthetics and assembly performance of products, more and more injection molded parts are produced using two-color injection molding. Two-color injection molding refers to the injection molding process of injecting two different materials into the same mold, thereby realizing that the injection molded product is formed by two materials.

[0003] However, in the two-color injection molding module of the related technology, when the second injection molding material is poured into the second molding cavity, the gas in the core and the second molding cavity formed by the first injection molding mold and the second cavity cannot be discharged, which increases the possibility of air marks in the injection molded product, resulting in poor appearance quality of the injection molded product. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a two-color injection mold and its usage method. During the casting process, the venting section on the first injection mold can expel the gas from the second molding cavity, reducing the phenomenon of trapped air in the second molding cavity. Correspondingly, this reduces the possibility of air marks appearing on the injection-molded product, further improving the appearance quality of the injection-molded product.

[0005] In a first aspect, this application provides a two-color injection mold, which includes a moving mold, a fixed mold, and a venting mechanism. The moving mold includes a core, and the fixed mold includes a first cavity and a second cavity. When the moving mold moves to a first position relative to the fixed mold, the core and the first cavity form a first molding cavity, which is used to pour a first injection molding material to form a first injection molded model within the first molding cavity. When the moving mold moves from the first position to a second position relative to the fixed mold, the core and the first injection molded model, together with the second cavity, form a second molding cavity, which is used to pour a second injection molding material to form a second injection molded model within the second molding cavity. The venting mechanism is disposed on the side of the first cavity opposite to the core, and is used to form a venting part in the first injection molded model corresponding to the position of the venting mechanism. The venting part is used to discharge the gas in the second molding cavity during the pouring of the second injection molding material.

[0006] The two-color injection mold provided in this application has an venting mechanism on the side opposite to the core in the first cavity. When the moving mold moves to the first position relative to the fixed mold, the core and the first cavity form a first molding cavity. The first molding cavity is filled with the first injection molding material, and a first injection molded model is formed in the first molding cavity. During the pouring process, the first injection molded model forms an venting part corresponding to the position of the venting mechanism. When the moving mold moves from the first position to the second position relative to the fixed mold, the core and the first injection molded model and the second cavity form a second molding cavity. The second molding cavity is filled with the second injection molding material, and a second injection molded model is formed in the second molding cavity. During the pouring process, the venting part on the first injection molded model can expel the gas in the second molding cavity, reducing the phenomenon of trapped air in the second molding cavity. Correspondingly, this reduces the possibility of air marks appearing on the injection molded product, further improving the appearance quality of the injection molded product.

[0007] In one possible implementation provided in this application, the venting mechanism is a columnar structure disposed on the side of the first cavity opposite to the core and extending in the direction close to the core, used to form vent holes at the position of the first injection mold corresponding to the columnar structure.

[0008] In one possible implementation provided in this application, the two-color injection mold further includes a mounting block, and an venting mechanism is disposed on the mounting block. The mounting block is detachably mounted on the side of the first cavity opposite to the core.

[0009] In one possible implementation provided in this application, there are multiple exhaust mechanisms, which are distributed on the side of the first cavity opposite to the core.

[0010] In one possible implementation provided in this application, the moving mold further includes a protective core. The arrangement direction of the protective core and the mold core on the moving mold is the same as the arrangement direction of the first cavity and the second cavity on the fixed mold. When the moving mold moves to the first position relative to the fixed mold, the protective core extends into the second cavity to prevent external substances from entering the second cavity. When the moving mold moves from the first position to the second position relative to the fixed mold, the protective core extends into the first cavity to prevent external substances from entering the first cavity.

[0011] In one possible implementation provided in this application, the fixed mold includes a first gating port and a second gating port. The first gating port is used to communicate with a first cavity and to allow a first injection molding material to enter. The second gating port is used to communicate with a second cavity and to allow a second injection molding material to enter.

[0012] In one possible implementation provided in this application, the two-color injection mold further includes a guide demolding device disposed on at least one of the moving mold and the fixed mold, for separating the moving mold and the fixed mold.

[0013] Secondly, this application also provides a method of using the two-color injection mold provided in any of the first aspects, the method of use including:

[0014] The moving mold is moved to the first position so that the core and the first cavity form the first molding cavity;

[0015] The first injection molding material is poured into the first molding cavity, and the first injection molding mold is formed in the first molding cavity. The first injection molding mold forms an exhaust section corresponding to the position of the exhaust mechanism.

[0016] The moving mold is moved from the first position to the second position so that the core and the first injection mold form a second molding cavity with the second cavity;

[0017] The second injection molding material is poured into the second molding cavity, a second injection mold is formed on the core, and the gas in the second molding cavity is discharged through the venting part.

[0018] The method of use provided in this application has the same technical effect as the method of using the two-color injection mold provided in any of the first aspects. That is, during the casting process, the venting part on the first injection mold can expel the gas in the second molding cavity, reducing the phenomenon of trapped air in the second molding cavity. Correspondingly, it reduces the possibility of air marks appearing on the injection molded product, further improving the appearance quality of the injection molded product.

[0019] In one possible implementation provided in this application, the venting mechanism is a columnar structure disposed on the side of the first cavity opposite to the core and extending in a direction close to the core. The steps of pouring the first injection molding material into the first molding cavity, forming a first injection mold within the first molding cavity, and forming a venting section in the first injection mold corresponding to the position of the venting mechanism include:

[0020] The first injection molding material is poured into the first molding cavity, and the first injection molding mold is formed in the first molding cavity. The first injection molding mold forms an exhaust hole at the position of the exhaust mechanism.

[0021] In one possible implementation provided in this application, the two-color injection molding module further includes a mounting block, and a venting mechanism is disposed on the mounting block. The mounting block is detachably mounted on the side of the first cavity opposite to the core. Before the step of moving the moving mold to the first position to form a first molding cavity with the core and the first cavity, the method further includes:

[0022] Install the mounting block on the side of the first cavity opposite to the core. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a two-color injection mold in which the moving mold moves to a first position relative to the fixed mold, as provided in an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the structure of a two-color injection mold in which the moving mold separates from the fixed mold at a first position, as provided in an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the structure of a two-color injection mold in an embodiment of this application, showing the moving mold moving to a second position relative to the fixed mold.

[0026] Figure 4 This is a structural schematic diagram of the interior trim panel under the B-pillar provided in an embodiment of this application;

[0027] Figure 5 A schematic diagram of the structure of the venting mechanism provided on the fixed mold when the two-color injection mold provided in the embodiment of this application is used to inject the interior trim panel of the B-pillar;

[0028] Figure 6 A schematic diagram of the structure of the first injection mold forming the exhaust section when the two-color injection mold provided in the embodiment of this application is used to inject the interior trim panel under the B-pillar;

[0029] Figure 7 This is a schematic diagram of the mesh model of the interior trim panel under the B-pillar provided in an embodiment of this application;

[0030] Figure 8 A schematic diagram of the casting system for the interior trim panel under the B-pillar provided in an embodiment of this application;

[0031] Figure 9 One of the flowcharts illustrating the method of using a two-color injection mold provided in this application embodiment;

[0032] Figure 10 A second flowchart illustrating the method of using a two-color injection mold provided in this application embodiment;

[0033] Figure 11 The third flowchart illustrates the method of using a two-color injection mold provided in this application embodiment.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Two-color injection mold; 11-Moving mold; 111-Core; 112-Protective core; 12-Fixed mold; 121-First cavity; 122-Second cavity; 123-First sprue; 124-Second sprue; 125-Exhaust mechanism; 2-B-pillar interior trim panel; 21-First injection mold; 211-Exhaust section; 22-High speaker hole; 23-Air outlet; 3-Gating system; 31-Hot runner; 32-Hot gate; 33-Cold runner; 34-Cold gate. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0038] In the embodiments of this application, the terms "first" and "second" 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0039] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0040] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0041] 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.

[0042] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0043] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 This application provides a two-color injection mold 1, which includes a moving mold 11, a fixed mold 12, and a venting mechanism 125. The moving mold 11 includes a core 111, and the fixed mold 12 includes a first cavity 121 and a second cavity 122. When the moving mold 11 moves to a first position relative to the fixed mold 12, the core 111 and the first cavity 121 form a first molding cavity, which is used to pour a first injection molding material to form a first injection molded model 21. When the moving mold 11 moves from the first position to a second position relative to the fixed mold 12, the core 111, the first injection molded model 21, and the second cavity 122 form a second molding cavity, which is used to pour a second injection molding material to form a second injection molded model. (Refer to...) Figure 4 , Figure 5 and Figure 6 The venting mechanism 125 is located on the side of the first cavity 121 opposite to the core 111, and is used to form an venting part 211 in the first injection mold 21 corresponding to the position of the venting mechanism 125. The venting part 211 is used to discharge the gas in the second molding cavity when the second injection molding material is poured.

[0044] In this embodiment of the application, two-color injection molding refers to the injection molding process in which two different materials are injected into the same mold, thereby realizing that the injection-molded product is formed by two materials.

[0045] In this embodiment of the application, the product injection molded by the two-color injection mold 1 can be a product on a vehicle, such as the interior trim panel under the B pillar; the product injection molded by the two-color injection mold 1 can also be a product on a processing fixture. It should be noted that this embodiment of the application does not limit the type of product injection molded by the two-color injection mold 1.

[0046] In this embodiment, the moving mold 11 moves to a first position relative to the fixed mold 12. The movement of the moving mold 11 relative to the fixed mold 12 can be either translation or rotation; this embodiment does not limit the movement in this way. In one possible implementation provided by this embodiment, the moving mold 11 and the fixed mold 12 are opposite each other, and the moving mold 11 translates relative to the fixed mold 12 to the first position, which facilitates operation.

[0047] In this embodiment, the moving mold 11 moves to a first position relative to the fixed mold 12. Here, the fixed mold 12 can remain stationary while the moving mold 11 moves, or the moving mold 11 can remain stationary while the fixed mold 12 moves. This embodiment does not limit this.

[0048] In this embodiment, the moving mold 11 moves from a first position to a second position relative to the fixed mold 12. The movement of the moving mold 11 relative to the fixed mold 12 can be translation or rotation; this embodiment does not limit the movement. In one possible implementation, the moving mold 11 rotates relative to the fixed mold 12. Furthermore, the angle of rotation is not limited in this embodiment. In one possible implementation, the moving mold 11 rotates 180 degrees relative to the fixed mold 12. At this time, the core 111, the first injection mold 21, and the second cavity 122 form a second molding cavity.

[0049] In this embodiment, when the moving mold 11 moves to the first position relative to the fixed mold 12, the core 111 and the first cavity 121 form a first molding cavity, which is used to pour the first injection molding material. The core 111 and the first injection molding mold 21 and the second cavity 122 form a second molding cavity, which is used to pour the second injection molding material. Since two-color injection molding refers to injecting two different materials into the same mold, thereby realizing the injection molding process in which the product is formed by two materials, the first injection molding material and the second injection molding material are of different material types. In one possible implementation method provided in this embodiment, the first injection molding material is hard plastic and the second injection molding material is soft plastic.

[0050] In this embodiment, the venting mechanism 125 is disposed on the side of the first cavity 121 opposite to the core 111, and is used to form a venting section 211 at the position of the first injection mold 21 corresponding to the venting mechanism 125. The venting section 211 is used to discharge the gas in the second molding cavity when the second injection molding material is poured. Here, the venting mechanism 125 can form the venting section 211 at the position of the venting mechanism 125 corresponding to the first injection mold 21. The venting mechanism 125 can be a columnar structure, and the venting section 211 can be a vent hole formed on the first injection mold 21. The venting mechanism 125 can be a guide tube, and the venting section 211 can be the opening of the guide tube. Here, this embodiment does not limit the type of venting mechanism 125 or the type of venting section 211 formed.

[0051] The two-color injection mold 1 provided in this application embodiment has an exhaust mechanism 125 provided on the side of the first cavity 121 opposite to the core 111. When the moving mold 11 moves to the first position relative to the fixed mold 12, the core 111 and the first cavity 121 form a first molding cavity. The first molding cavity is filled with the first injection molding material, and the first injection mold 21 is formed in the first molding cavity. At this time, during the pouring process, the first injection mold 21 forms an exhaust part 211 corresponding to the position of the exhaust mechanism 125. When the moving mold 11 moves from the first position to the second position relative to the fixed mold 12, the core 111 and the first injection mold 21 and the second cavity 122 form a second molding cavity. The second molding cavity is filled with the second injection molding material, and the second injection mold is formed in the second molding cavity. At this time, during the pouring process, the exhaust part 211 on the first injection mold 21 can expel the gas in the second molding cavity, reducing the phenomenon of trapped air in the second molding cavity. Correspondingly, it reduces the possibility of air marks appearing in the injection molded product, and further improves the appearance quality of the injection molded product.

[0052] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 This application provides a two-color injection mold 1, wherein the venting mechanism 125 is a columnar structure disposed on the side of the first cavity 121 opposite to the core 111 and extending in the direction close to the core 111, for forming vent holes in the first injection mold 21 at the position corresponding to the columnar structure.

[0053] In this embodiment, the venting mechanism 125 is a columnar structure disposed on the side of the first cavity 121 opposite to the core 111 and extending in a direction close to the core 111. Here, the dimension of the columnar structure in the direction forming an angle with its extension direction may not be greater than 2.0 mm, which may cause shrinkage of the surface of the second injection mold; the dimension of the columnar structure in the direction forming an angle with its extension direction may not be less than 1.5 mm, which may cause the columnar structure to break; the dimension of the columnar structure in its extension direction should be greater than or equal to the thickness of the first injection mold 21, so that vent holes are formed at the position of the columnar structure in the first injection mold 21; on this basis, the dimension of the columnar structure in its extension direction should not be greater than the dimension of the entire first molding cavity in its extension direction, so that the fixed mold 12 and the moving mold 11 cannot be engaged.

[0054] In this embodiment, the exhaust mechanism 125 is a columnar structure disposed on the side of the first cavity 121 opposite to the core 111 and extending in a direction close to the core 111. Here, the cross-sectional shape of the columnar structure can be a regular shape, such as a circle, a square, or a rectangle, along the direction forming an angle with the extending direction. Of course, the cross-sectional shape of the columnar structure can also be an irregular shape, which is not limited in this embodiment. In one possible implementation provided by this embodiment, the exhaust mechanism 125 is a columnar structure disposed on the side of the first cavity 121 opposite to the core 111 and extending in a direction close to the core 111, and the columnar structure is similar to a needle.

[0055] In this embodiment, the columnar structure is used to form an vent hole at the position of the first injection molded model 21 corresponding to the columnar structure. If the dimension of the columnar structure in the direction forming an angle with its extension direction is not greater than 2.0 mm, then the dimension of the vent hole in the direction forming an angle with the columnar structure is not greater than 2.0 mm; if the dimension of the columnar structure in the direction forming an angle with its extension direction is not less than 1.5 mm, then the dimension of the vent hole in the direction forming an angle with the columnar structure is not less than 1.5 mm.

[0056] The two-color injection mold 1 provided in this application embodiment has an exhaust mechanism 125, which is a columnar structure located on the side of the first cavity 121 opposite to the core 111 and extending in the direction close to the core 111. It is used to form an exhaust hole at the position of the first injection mold 21 corresponding to the columnar structure. The structure is simple, easy to operate, and cost-effective. Based on this, the exhaust mechanism 125 is located on the side of the first cavity 121 opposite to the core 111 and extending in the direction close to the core 111. In this way, when the moving mold 11 separates from the fixed mold 12, the columnar structure can provide demolding force for the first injection mold 21. This can create a gap between the first injection mold 21 and the core 111. In other words, the first injection mold 21 is not completely attached to the core 111, which is beneficial for the gas in the second molding cavity to be discharged through the exhaust hole and the gap between the first injection mold 21 and the core 111 when the second injection molding material is poured, thus accelerating the gas discharge speed.

[0057] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 The present application provides a two-color injection mold 1, which also includes a mounting block. An exhaust mechanism 125 is disposed on the mounting block, and the mounting block is detachably mounted on the side of the first cavity 121 opposite to the core 111.

[0058] In this embodiment, the two-color injection mold 1 further includes a mounting block. A venting mechanism 125 is disposed on the mounting block. The mounting block is detachably mounted on the side of the first cavity 121 opposite to the core 111. Specifically, the mounting block can be snap-fitted onto the side of the first cavity 121 opposite to the core 111. For example, a snap-fit ​​protrusion can be provided on the mounting block, and a snap-fit ​​groove can be provided on the side of the first cavity 121 opposite to the core 111. The snap-fit ​​protrusion and snap-fit ​​groove are adapted to allow the mounting block to be detachably mounted on the side of the first cavity 121 opposite to the core 111. Here, the mounting block can be threaded onto the side of the first cavity 121 opposite to the core 111. For example, a first threaded hole can be provided on the mounting block, and a second threaded hole can be provided on the side of the first cavity 121 opposite to the core 111. Threaded fasteners pass through the first threaded hole and the second threaded hole in sequence, so that the mounting block can be detachably mounted on the side of the first cavity 121 opposite to the core 111. It should be noted that the embodiments of this application do not limit the mounting method of detachably mounting the mounting block on the side of the first cavity 121 opposite to the first core 111.

[0059] The two-color injection mold 1 provided in this application embodiment has an installation block that can be detachably installed on the side of the first cavity 121 opposite to the core 111, which facilitates the maintenance and replacement of the venting mechanism 125.

[0060] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 The present application provides a two-color injection mold 1, which has multiple venting mechanisms 125, and the multiple venting mechanisms 125 are evenly distributed on the side of the first cavity 121 opposite to the core 111.

[0061] In this embodiment, there are multiple exhaust mechanisms 125, which are evenly distributed on the side of the first cavity 121 opposite to the core 111. For example, there are 18 exhaust mechanisms 125, which are evenly distributed on the side of the first cavity 121 opposite to the core 111.

[0062] The two-color injection mold 1 provided in this application embodiment can form multiple venting parts 211 at the positions of the venting mechanisms 125 corresponding to the first injection mold by setting multiple venting mechanisms 125. In this way, the speed at which the gas in the second molding cavity is discharged through the multiple venting parts 211 can be accelerated.

[0063] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6This application provides a two-color injection mold 1. The moving mold 11 further includes a protective core 112. The arrangement direction of the protective core 112 and the core 111 on the moving mold 11 is the same as the arrangement direction of the first cavity 121 and the second cavity 122 on the fixed mold 12. When the moving mold 11 moves to the first position relative to the fixed mold 12, the protective core 112 extends into the second cavity 122 to prevent external substances from entering the second cavity 122. When the moving mold 11 moves from the first position to the second position relative to the fixed mold 12, the protective core 112 extends into the first cavity 121 to prevent external substances from entering the first cavity 121.

[0064] In this embodiment, the moving mold 11 further includes a protective core 112. The arrangement direction of the protective core 112 and the mold core 111 on the moving mold 11 is the same as the arrangement of the first cavity 121 and the second cavity 122 on the fixed mold 12. Here, the outer contour of the protective core 112 can be the same as or different from the outer contour of the mold core 111. This embodiment does not limit this. In one possible implementation provided by this embodiment, the outer contour of the protective core 112 is the same as the outer contour of the mold core 111. This facilitates processing and manufacturing. In other words, during the manufacturing process, there is no need to distinguish between the mold core 111 and the protective core 112.

[0065] The two-color injection mold 1 provided in this application embodiment, by setting a protective core 112, when the moving mold 11 moves to the first position relative to the fixed mold 12, the protective core 112 extends into the second cavity 122 to prevent external substances from entering the second cavity 122. When the moving mold 11 moves from the first position to the second position relative to the fixed mold 12, the protective core 112 extends into the first cavity 121 to prevent external substances from entering the first cavity 121. In this way, the phenomenon of impurities being mixed into the first injection mold 21 or the second injection mold during the injection process can be reduced.

[0066] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 In an embodiment of this application, a two-color injection mold 1 is provided. The fixed mold 12 includes a first pouring port 123 and a second pouring port 124. The first pouring port 123 is connected to the first cavity 121 and is used to allow the first injection molding material to enter. The second pouring port 124 is connected to the second cavity 122 and is used to allow the second injection molding material to enter.

[0067] In this embodiment, the fixed mold 12 includes a first pouring port 123, which is used to communicate with the first cavity 121 and to allow the first injection molding material to enter. Here, the first pouring port 123 can be opposite to the first cavity 121. Of course, the first pouring port 123 can also be not opposite to the first cavity 121. This embodiment does not limit this.

[0068] In this embodiment, the fixed mold 12 includes a second pouring port 124, which is connected to the second cavity 122. The second pouring port 124 is used to allow the second injection molding material to enter. Here, the second pouring port 124 can be opposite to the first cavity 121. Of course, the second pouring port 124 can be not opposite to the second cavity 122. This embodiment does not limit this.

[0069] The two-color injection mold 1 provided in this application embodiment includes a first pouring port 123 and a second pouring port 124 in the fixed mold 12. The first pouring port 123 is used to allow the first injection molding material to enter, and the second pouring port 124 is used to allow the second injection molding material to enter. In this way, the phenomenon of mixing of the first injection molding material and the second injection molding material can be avoided when a pouring port is set up during the pouring process.

[0070] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 This application provides a two-color injection mold 1, which further includes a guide demolding device disposed on at least one of the moving mold 11 and the fixed mold 12, for separating the moving mold 11 and the fixed mold 12.

[0071] In this embodiment, a guiding demolding device is disposed on at least one of the moving mold 11 and the fixed mold 12 to separate the moving mold 11 and the fixed mold 12. Here, the guiding demolding device can be a guide rod disposed on at least one of the moving mold 11 or the fixed mold 12; the guiding demolding device can also be an electromagnet disposed on the moving mold 11 and the fixed mold 12. When opposite currents are input to the fixed mold 12 and the moving mold 11, the electromagnet generates a repulsive force, causing the moving mold 11 and the fixed mold 12 to separate. It should be noted that this embodiment is not limited in this respect.

[0072] The two-color injection mold 1 provided in this application embodiment enables the moving mold 11 and the fixed mold 12 to separate quickly by setting the guide demolding device on at least one of the moving mold 11 and the fixed mold 12, thus saving separation time.

[0073] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6and Figure 9 This application also provides a method of using the two-color injection mold 1 provided in any of the first aspects, the method of use comprising:

[0074] Step S1: Move the moving mold 11 to the first position so that the core 111 and the first cavity 121 form the first molding cavity;

[0075] Step S2: The first injection molding material is poured into the first molding cavity, and the first injection molding mold 21 is formed in the first molding cavity. The first injection molding mold 21 forms an exhaust part 211 at the position corresponding to the exhaust mechanism 125.

[0076] Step S3: Move the moving mold 11 from the first position to the second position so that the core 111 and the first injection mold 21 and the second cavity 122 form the second molding cavity;

[0077] Step S4: Pour the second injection molding material into the second molding cavity, form the second injection molding model on the core 111, and allow the gas in the second molding cavity to be discharged from the exhaust section 211.

[0078] The method of using the two-color injection mold 1 provided in this application embodiment involves an venting mechanism 125 provided on the side of the first cavity 121 opposite to the core 111. When the moving mold 11 moves to the first position relative to the fixed mold 12, the core 111 and the first cavity 121 form a first molding cavity. The first molding cavity is filled with the first injection molding material, and a first injection mold 21 is formed within the first molding cavity. During the pouring process, the first injection mold 21 forms an venting section 211 corresponding to the position of the venting mechanism 125. When the moving mold 11 moves to the first position relative to the fixed mold 12, the venting mechanism 125 is used to form an venting section 211. When the fixed mold 12 moves from the first position to the second position, the core 111 and the first injection mold 21 and the second cavity 122 form a second molding cavity. The second molding cavity is filled with the second injection molding material. When the second injection mold is formed in the second molding cavity, during the pouring process, the venting part 211 on the first injection mold 21 can expel the gas in the second molding cavity. The phenomenon of trapped air in the second molding cavity is reduced. Correspondingly, the possibility of air marks appearing in the injection molded product is reduced, and the appearance quality of the injection molded product is further improved.

[0079] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 10This application embodiment also provides a method of using the two-color injection mold 1 provided in any of the first aspects. The venting mechanism 125 is a columnar structure disposed on the side of the first cavity 121 opposite to the core 111 and extending in the direction close to the core 111. The first injection molding material is poured into the first molding cavity, and the first injection mold 21 is formed in the first molding cavity. The first injection mold 21 is formed with an venting part 211 at the position of the venting mechanism 125. Step S2 is to pour the first injection molding material into the first molding cavity, form the first injection mold 21 in the first molding cavity, and form an venting hole at the position of the venting mechanism 125 in the first injection mold 21.

[0080] The method of using the two-color injection mold 1 provided in this application embodiment includes an exhaust mechanism 125, which is a columnar structure located on the side of the first cavity 121 opposite to the core 111 and extending in the direction close to the core 111. This structure is used to form an exhaust hole at the position of the first injection mold 21 corresponding to the columnar structure. The structure is simple, easy to operate, and cost-effective. Furthermore, by setting the exhaust mechanism 125 on the side of the first cavity 121 opposite to the core 111 and extending in the direction close to the core 111, the columnar structure can provide demolding force to the first injection mold 21 when the moving mold 11 separates from the fixed mold 12. This creates a gap between the first injection mold 21 and the core 111. In other words, the first injection mold 21 is not completely attached to the core 111, which is beneficial for the gas in the second molding cavity to be discharged through the exhaust hole and the gap between the first injection mold 21 and the core 111 when the second injection molding material is poured, thus accelerating the gas discharge speed.

[0081] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 11 The present application also provides a two-color injection mold 1 according to any one of the first aspects. The two-color injection mold 1 further includes a mounting block, and an exhaust mechanism 125 is disposed on the mounting block. The mounting block is detachably mounted on the side of the first cavity 121 opposite to the core 111. Before step S1 of moving the moving mold 11 to the first position so that the core 111 and the first cavity 121 form a first molding cavity, the method of use further includes:

[0082] Step S5: Install the mounting block on the side of the first cavity 121 opposite to the core 111.

[0083] The method of using the two-color injection mold 1 provided in this application embodiment is that the mounting block is detachably installed on the side of the first cavity 121 opposite to the core 111, so that the exhaust mechanism 125 can be easily repaired and replaced.

[0084] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 This application also provides a specific embodiment. In order to improve the grade of the B-pillar interior panel 2, the B-pillar interior panel 2 is also made of two-color injection molding. First, a layer of hard plastic is injection molded into the B-pillar interior panel, and then a layer of soft plastic with a 3D pattern structure is injection molded on its surface, so that consumers can feel a good touch. However, when the soft plastic is injection molded, part of the melt will split into two streams and then flow downwards around the high speaker hole 22 of the B-pillar interior panel 2. They converge at the position between the high speaker hole 22 and the air outlet 23 of the B-pillar interior panel. The air in the two streams of soft plastic melt flowing around the speaker is continuously compressed towards the converging position. Since a layer of hard plastic has been injection molded under the soft plastic, the hard plastic, the soft plastic and the fixed mold 12 form a closed whole for the two streams of melt that have bypassed the high speaker hole 22, and the air at that position cannot be discharged, thus forming three obvious air marks on the soft plastic. Therefore, the two-color injection mold 1 provided in this application embodiment is used.

[0085] First, three obvious air marks are formed on the soft rubber of the B-pillar lower interior panel 2 (i.e., the second injection mold). It is necessary to form an exhaust part 211 on the hard rubber of the B-pillar lower interior panel 2 (i.e., the first injection mold 21). Therefore, it is necessary to first determine the specific location of the air marks in the soft rubber of the B-pillar lower interior panel 2 and perform mold flow analysis. Only in this way can the specific position of the exhaust mechanism 125 on the side opposite to the core 111 of the first cavity 121 be determined, so as to shorten the mold modification cycle and save mold design change costs.

[0086] Specifically, the first step is to perform 3D data preprocessing, import the 3D data of the B-pillar lower interior panel 2 into CAD doctorfor Autodesk, remove small rounded corners and chamfers, then stitch up the discontinuous surfaces and export the sdy model.

[0087] Step 2: Mesh Generation. Open Autodesk Simulation Moldflow Synergy software, import the .sdy model that has just undergone geometric processing, select Fusion as the mesh type, and then mesh the geometric model. Modify the mesh to meet the following requirements: 1 connected region, 0 free edges, 0 multi-edges, 0 incorrectly aligned elements, 0 intersecting elements, 0 completely overlapping elements, maximum aspect ratio less than 20, and matching percentage greater than 86%. Figure 7 As shown;

[0088] Step 3: Establish pouring system 3, such as Figure 8As shown, for aesthetic reasons, no gate can be placed on the soft rubber surface of the interior panel under B pillar. The structure of the interior panel under B pillar is a 3D pattern structure. The flow direction of the soft rubber melt is preferably along the direction of the rib. The runner system includes hot runner 31, hot gate 32, cold runner 33 and cold gate 34.

[0089] Step 4: Process settings. Select the molding material according to the actual production of the product, and set process parameters such as mold surface temperature, melt temperature, injection time, speed / pressure switching position, holding time, holding pressure, and cooling time according to the material.

[0090] Step 5: After completing the above pretreatment and process settings, perform injection molding filling and holding pressure analysis in Mlodflow. After the analysis is completed, the location of cavitation formation will be displayed in the flow results.

[0091] Secondly, an venting mechanism 125, such as an venting pin, is provided on the side of the first cavity 121 of the fixed mold 12 opposite to the core 111. This allows multiple small round holes (venting holes) to be formed in the hard plastic of the B-pillar lower interior panel at the high speaker hole 22 and the air outlet 23. Here, the size of the venting pin is equal to the diameter of the small round hole on the B-pillar lower interior panel, with a diameter of 1.5mm-2.0mm. The venting pin should not be larger than 2.0mm, otherwise shrinkage will occur on the soft plastic surface. The diameter of the venting pin should also not be less than 1.5mm, otherwise it will easily break during actual use. The height of the venting pin is equal to the thickness of the hard plastic of the B-pillar lower interior panel. Considering the service life and interchangeability of the mold, the venting pin can also be designed on a mounting block, which is installed on the first cavity 121 of the fixed mold 12 in the hard plastic of the B-pillar lower interior panel.

[0092] Finally, when the hard plastic melt (first injection molding material) of the B-pillar lower interior panel flows into the first molding cavity through the gating system to complete the hard plastic injection, the moving mold 11 and the fixed mold 12 separate, and vent holes are formed on the hard plastic of the B-pillar lower interior panel. After the moving mold 11 rotates 180°, the moving mold 11 and the fixed mold 12 close, and the soft plastic melt (second injection molding material) is injected again into the second molding cavity through the gating system. The air from the tweeter hole and the air outlet 23 is discharged through the small round hole of the hard plastic of the B-pillar lower interior panel to the space between the hard plastic of the B-pillar lower interior panel and the core 111 of the moving mold 11, and then discharged from the mold through the gap between the core 111 and the gap between the ejector pin (guide demolding device) and the core 111, thereby avoiding the formation of air marks on the surface of the soft plastic. Based on this, when the moving mold 11 separates from the fixed mold 12, the fixed mold 12 also exerts a demolding force on the hard plastic of the interior panel under the pillar, which slightly pulls the hard plastic of the interior panel under the pillar B away from the core 111, that is, the hard plastic is not completely attached to the core 111, which is conducive to the discharge of gas during the injection of soft plastic.

[0093] The above description is merely an embodiment 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 covered within the scope of protection of this application.

Claims

1. A two-color injection mold (1), characterized in that, include: Moving mold (11), the moving mold (11) includes a core (111); The fixed mold (12) includes a first cavity (121) and a second cavity (122). When the moving mold (11) moves to a first position relative to the fixed mold (12), the core (111) and the first cavity (121) form a first molding cavity. The first molding cavity is used to pour a first injection molding material to form a first injection molded model (21) in the first molding cavity. When the moving mold (11) moves from the first position to a second position relative to the fixed mold (12), the core (111) and the first injection molded model (21) and the second cavity (122) form a second molding cavity. The second molding cavity is used to pour a second injection molding material to form a second injection molded model in the second molding cavity. The exhaust mechanism (125) is disposed on the side of the first cavity (121) opposite to the core (111) and is used to form an exhaust part (211) on the first injection mold (21) corresponding to the position of the exhaust mechanism (125). The exhaust part (211) is used to discharge the gas in the second molding cavity when the second injection molding material is poured. The moving mold also includes a protective core (112). The arrangement direction of the protective core (112) and the core (111) on the moving mold (11) is the same as the arrangement direction of the first cavity (121) and the second cavity (122) on the fixed mold (12). When the moving mold (11) moves to the first position relative to the fixed mold (12), the protective core (112) extends into the second cavity (122) to prevent external substances from entering the second cavity (122). When the moving mold (11) moves from the first position to the second position relative to the fixed mold (12), the protective core (112) extends into the first cavity (121) to prevent external substances from entering the first cavity (121).

2. The two-color injection mold (1) according to claim 1, characterized in that, The venting mechanism (125) is a columnar structure disposed on the side of the first cavity (121) opposite to the core (111) and extending in a direction close to the core (111), used to form an venting hole in the first injection mold (21) corresponding to the position of the columnar structure.

3. The two-color injection mold (1) according to claim 1, characterized in that, The two-color injection mold also includes a mounting block, and the venting mechanism (125) is disposed on the mounting block. The mounting block is detachably mounted on the side of the first cavity (121) opposite to the core (111).

4. The two-color injection mold according to claim 3, characterized in that, There are multiple exhaust mechanisms (125), and the multiple exhaust mechanisms (125) are evenly distributed on the side opposite to the first cavity (121) and the core (111).

5. The two-color injection mold (1) according to any one of claims 1 to 4, characterized in that, The fixed mold (12) includes a first pouring port (123) and a second pouring port (124). The first pouring port (123) is connected to the first cavity (121) and is used to allow the first injection molding material to enter. The second pouring port (124) is connected to the second cavity (122) and is used to allow the second injection molding material to enter.

6. The two-color injection mold (1) according to any one of claims 1 to 4, characterized in that, The two-color injection mold also includes a guide demolding device, which is disposed on at least one of the moving mold (11) and the fixed mold (12) for separating the moving mold (11) and the fixed mold (12).

7. A method of using a two-color injection mold according to any one of claims 1 to 6, characterized in that, include: The moving mold (11) is moved to the first position so that the core (111) and the first cavity (121) form a first molding cavity; The first injection molding material is poured into the first molding cavity, and the first injection molding model (21) is formed in the first molding cavity. The first injection molding model (21) forms an exhaust part (211) at the position corresponding to the exhaust mechanism (125). The moving mold (11) is moved from the first position to the second position so that the core (111) and the first injection mold (21) and the second cavity (122) form a second molding cavity; The second injection molding material is poured into the second molding cavity, a second injection molding model is formed on the core (111), and the gas in the second molding cavity is discharged from the exhaust part (211).

8. The method of use according to claim 7, characterized in that, The venting mechanism (125) is a columnar structure disposed on the side of the first cavity (121) opposite to the core (111) and extending in a direction close to the core (111). The steps of pouring the first injection molding material into the first molding cavity, forming a first injection mold (21) in the first molding cavity, and forming an venting part (211) in the first injection mold (21) corresponding to the position of the venting mechanism (125) include: The first injection molding material is poured into the first molding cavity, and the first injection molding model (21) is formed in the first molding cavity. The first injection molding model (21) forms an exhaust hole at the position corresponding to the exhaust mechanism (125).

9. The method of use according to claim 7, characterized in that, The two-color injection mold further includes a mounting block, and the venting mechanism (125) is disposed on the mounting block. The mounting block is detachably mounted on the side of the first cavity (121) opposite to the core (111). Before the step of moving the moving mold (11) to the first position so that the core (111) and the first cavity (121) form a first molding cavity, the method of use further includes: The mounting block is installed on the side of the first cavity (121) opposite to the core (111).

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