An injection mold

Abstract

This application relates to an injection mold. The injection mold includes: a mold body; and a movable part movably disposed within the mold body. The movable part has a lubricating layer formed on at least the surface of the area where it makes contact with the mold body. By forming a lubricating layer on the surface of the movable part in at least the area where it makes contact with the mold body, the frictional force between the movable part and the mold body is reduced, resulting in smoother relative movement. This reduces or even eliminates the problem of poor demolding, improving the demolding efficiency of the injection mold in the actual production of injection molded products. Furthermore, the lubricating layer provides a self-lubricating effect between the movable part and the mold body, reducing or eliminating the need for lubrication and maintenance procedures, saving significant maintenance costs, and reducing the residue of lubricating oil and other impurities that could leave oil stains or other defects on the surface of the injection molded products, thus improving the yield rate of the injection molded products.

Description

Technical Field

[0001] This application belongs to the field of injection molding technology, specifically relating to an injection mold. Background Technology

[0002] An injection mold is a highly efficient tool for mass production of plastic products. It involves injecting molten plastic material into a mold cavity, allowing it to cool and solidify before demolding to obtain the molded product.

[0003] In actual production, staff need to spend a lot of manpower and resources to maintain and repair injection molds, which not only results in huge waste, but also easily leaves behind oil stains and other impurities, affecting the quality of the finished injection molded products. Utility Model Content

[0004] This application provides an injection mold to solve the technical problem that the maintenance of the injection mold affects the quality of the injection molded product.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: an injection mold, comprising: a mold body; a movable part movably disposed on the mold body; wherein, the movable part has a lubricating layer formed on at least the surface of the area for moving contact with the mold body.

[0006] According to one embodiment of this application, the lubricating layer is integrally formed on the outer surface of the movable part.

[0007] According to one embodiment of this application, the movable component includes one or more of a ejector pin, a push plate, and a slider.

[0008] According to one embodiment of this application, the lubricating layer is formed by physical vapor deposition or by plasma-enhanced chemical vapor deposition.

[0009] According to one embodiment of this application, the lubricating layer includes any one or more of TiN layer, TiAlN layer, CrAlN layer, DLC layer, and CrN layer; and / or, the thickness of the lubricating layer is 2.5μm-4μm.

[0010] According to one embodiment of this application, the injection mold further includes: a recessed portion disposed on the mold body, the recessed portion being recessed and used to form a raised structure of the injection molded product, and a corrosion-resistant layer being formed on the surface of the recessed portion.

[0011] According to one embodiment of this application, the recessed portion includes a deep rib, which is used to form a reinforcing rib of the injection molded article.

[0012] According to one embodiment of this application, the corrosion-resistant layer is formed by physical vapor deposition or by plasma-enhanced chemical vapor deposition.

[0013] According to one embodiment of this application, the corrosion-resistant layer includes any one or more of TiN layer, TiAlN layer, CrAlN layer, DLC layer, and CrN layer; and / or, the thickness of the lubricating layer is 2.5μm-4μm.

[0014] The beneficial effects of this application are as follows: By forming a lubricating layer on the surface of the movable part, at least in the area where it makes contact with the mold body, the friction between the movable part and the mold body is small, resulting in smoother relative movement. This reduces or even eliminates the problem of poor demolding, improving the demolding efficiency of the injection mold in the actual production of injection molded products. Furthermore, the lubricating layer achieves a self-lubricating effect between the movable part and the mold body, reducing or eliminating the need for lubrication and maintenance procedures, saving significant maintenance costs, and reducing the residue of lubricating oil and other impurities that could leave oil stains or other defects on the surface of the injection molded products, thus improving the yield rate of injection molded products. Attached Figure Description

[0015] 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0016] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the injection mold of this application;

[0017] Figure 2 This is a partial cross-sectional schematic diagram of an embodiment of the injection mold of this application, mainly used to show the moving parts;

[0018] Figure 3 This is another partial cross-sectional schematic diagram of an embodiment of the injection mold of this application, mainly used to show the recessed portion. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] In the description 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] Injection molds are prone to defects such as oil stains, surface defects, and poor demolding during the actual production of injection molded products, especially on high-gloss and white products, resulting in low product yield. Through long-term research, the inventors of this application have discovered that a significant portion of oil stains originates from the lack of lubrication between moving parts and the mold body; surface defects are partly caused by iron filings shed from friction between moving parts and the mold body remaining on the product; and poor demolding is also related to relative sticking or jamming between moving parts and the mold body. Currently, solving these problems requires significant manpower and resources for mold maintenance, resulting in substantial waste and unsatisfactory results, with a continued high number of defective products.

[0023] Please see Figure 1 and Figure 2 , Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the injection mold of this application; Figure 2 This is a partial cross-sectional schematic diagram of an embodiment of the injection mold of this application, mainly used to show the moving parts.

[0024] One embodiment of this application provides an injection mold 100. The injection mold 100 includes a mold body 110 and a movable component 120. The movable component 120 is movably disposed on the mold body 110. During the production and use of the injection mold 100, the movable component 120 performs dynamic actions, such as ejection, sliding, and rotation, to achieve functions such as demolding and shape change. The movable component 120 has a lubricating layer 121 formed on at least the surface of the area that is in active contact with the mold body 110.

[0025] In the above technical solution, the movable part 120 has a lubricating layer 121 formed on the surface of the area that is in contact with the mold body 110. It has at least the following advantages: (1) The relative friction between the movable part 120 and the mold body 110 is small and the relative movement is smooth, which can reduce or even avoid the problem of poor demolding and improve the demolding efficiency of the injection mold 100 in the actual production of injection molded products; (2) The movable part 120 and the mold body 110 achieve a self-lubricating effect through the lubricating layer 121, which can reduce or eliminate the lubrication and maintenance process between the movable part 120 and the mold body 110, save a lot of maintenance costs, and reduce the residue of lubricating oil and other impurities that leave oil stains and other defects on the surface of the injection molded products, thereby improving the yield of injection molded products.

[0026] In some embodiments, to achieve a self-lubricating effect on the moving part 120, the moving part 120 may have a lubricating layer 121 formed only on the surface of the area that is in active contact with the mold body 110. This achieves a self-lubricating effect on the moving part 120 while saving costs.

[0027] In some other embodiments, a lubricating layer 121 is formed on the entire outer surface of the movable part 120. The lubricating layer 121 on the entire outer surface of the movable part 120 ensures its self-lubricating effect, reduces friction between the movable part 120 and the mold body 110, and thus reduces or eliminates the need for lubrication and maintenance procedures between the movable part 120 and the mold body 110. Furthermore, the formation of the lubricating layer 121 on the entire outer surface of the movable part 120 facilitates process implementation; the lubricating layer 121 forms more completely on the surface of the movable part 120, resulting in a more stable bond with the movable part 120 and further enhancing the self-lubricating effect.

[0028] The movable component 120 includes one or more of ejector pins, push plates, and sliders. Ejector pins can be angled, dome-shaped, square, or block-shaped. Ejector pins are key components of the ejection mechanism of the injection mold 100, their main function being to push the solidified injection molded product out of the mold cavity after injection molding, ensuring smooth demolding. The push plate (also called a top plate or ejector plate) is a special ejection mechanism that pushes the injection molded product out of the mold cavity by overall translation after the injection mold 100 opens. Unlike the point ejection of ejector pins, the push plate applies force through a larger contact area with the product surface, making it suitable for scenarios requiring high demolding smoothness and surface quality. The slider mainly moves laterally to pull out the side core of the mold during mold opening, allowing the injection molded product to be demolded smoothly and preventing damage caused by the side structure getting stuck in the mold body 110.

[0029] By forming a lubricating layer 121 on the outer surface of the moving parts 120 such as ejector pins, push plates or sliders, the friction between them and the mold body 110 can be reduced, thereby reducing or eliminating the lubrication and maintenance process between the moving parts 120 and the mold body 110, saving a lot of maintenance costs, and reducing the residue of lubricating oil and other impurities that may leave oil stains and other defects on the surface of the injection molded products, thus improving the yield of injection molded products.

[0030] To further enhance the performance of the injection mold 100, the lubrication layer 121 also possesses wear-resistant and corrosion-resistant properties. In some formulations, it can be described as the lubrication layer 121 also being a wear-resistant layer, and / or, the lubrication layer 121 also being a corrosion-resistant layer. While maintaining the self-lubricating effect of the moving part 120, the service life of the lubrication layer 121 can be extended.

[0031] Specifically, the lubricating layer 121 can be any one or more of other metal or non-metal compound layers, such as TiN layer (titanium nitride layer), TiAlN layer (aluminum titanium nitride layer), CrAlN layer (aluminum chromium nitride layer), DLC layer (diamond-like carbon layer), and CrN layer (chromium nitride layer). The aforementioned lubricating layer 121 has the characteristics of low coefficient of friction, high hardness, wear resistance, and corrosion resistance. On the one hand, the aforementioned lubrication layer 121 enables the self-lubrication of the moving part 120, resulting in low friction between the moving part 120 and the mold body 110, and smoother relative movement. This reduces or even eliminates the problem of poor demolding, improves the demolding efficiency of the injection mold 100 in the actual production of injection molded products, and reduces or eliminates the lubrication and maintenance process between the moving part 120 and the mold body 110, saving a significant amount of maintenance costs. On the other hand, the lubrication layer 121 of the moving part 120 also has wear-resistant and corrosion-resistant properties, which can extend the service life of the lubrication layer 121 of the moving part 120, prevent the injection molding material from corroding the lubrication layer 121, and thus prevent the moving part 120 from rusting or generating friction debris that leaves defects on the surface of the injection molded products, further improving the yield rate of the injection molded products.

[0032] It should be noted that the lubrication layer 121 of the movable part 120 can be made of the same material layer on the entire outer surface, or the lubrication layer 121 of the movable part 120 can be made of different material layers in different areas of the outer surface. The lubrication layer 121 of the movable part 120 can be formed as a single material layer or multiple material layers stacked together, which is not limited here.

[0033] The thickness of the lubricating layer 121 is 2.5μm-4μm. For example, 2.5μm, 2.7μm, 3μm, 3.2μm, 3.5μm, 3.8μm, or 4μm. Within the above thickness range, the thickness of the lubricating layer 121 is suitable, allowing for a stable bond with the moving part 120, and providing good self-lubricating effect, as well as good wear resistance and corrosion resistance.

[0034] In some embodiments, the lubricating layer 121 is formed using physical vapor deposition (PVD) or plasma-enhanced chemical vapor deposition (PECVD). The lubricating layer 121 formed using the aforementioned PVD or PECVD processes exhibits a low coefficient of friction, high hardness, good wear resistance, and chemical stability, making it easier for the moving part 120 to possess self-lubricating and wear- and corrosion-resistant properties. Furthermore, the lubricating layer 121 formed using these processes is more uniformly formed and bonds more firmly to the outer surface of the moving part 120, thereby extending the service life of the injection mold 100. It should be noted that the deposition process used for the lubricating layer 121 can be any known existing deposition process, and this invention is not limited to this; of course, in other embodiments, other methods such as coating or electroplating can also be used to form the lubricating layer 121.

[0035] In addition to forming a lubricating layer 121 on the moving part 120 of the injection mold 100, the inventors of this application have also discovered through long-term research that the injection mold 100 also has a recess 130, into which injection material enters and is plasticized to form part of the injection molded product. However, due to its narrow size and other reasons, some recesses 130 are prone to retaining injection material and are difficult to clean completely. Long-term retention of injection material will corrode the recesses 130 of the injection mold 100 and affect the quality of the injection molded products produced by the injection mold 100.

[0036] Please continue reading. Figure 3 , Figure 3 This is another partial cross-sectional schematic diagram of an embodiment of the injection mold of this application, mainly used to show the recessed portion. In some embodiments, the injection mold 100 further includes a recessed portion 130. The recessed portion 130 is disposed on the mold body 110, and the recessed portion 130 is recessed to form a raised structure of the injection molded article. A corrosion-resistant layer 131 is formed on the surface of the recessed portion 130.

[0037] By forming a corrosion-resistant layer 131 in the recess 130 of the injection mold 100, the corrosion of the recess 130 by residual injection material can be reduced or avoided, thereby ensuring the structural integrity of the recess 130, extending the service life of the injection mold 100, improving the product quality of the injection molded products, and greatly reducing production costs.

[0038] The recessed portion 130 includes a connecting area 132 that connects to the mold body 110 and a recessed area that is recessed relative to the connecting area 132. The recessed portion 130 may have a corrosion-resistant layer 131 formed only on the surface of the recessed area. Since the recessed area 133 is more prone to retaining injection molding material and is difficult to clean completely, forming a corrosion-resistant layer 131 in the recessed area can reduce or prevent corrosion by residual injection molding material, thereby ensuring the structural integrity of the recessed portion 130 and extending the service life of the injection mold 100. Alternatively, a corrosion-resistant layer 131 may be formed on both the connecting area 132 and the recessed area to achieve better corrosion resistance and ensure the structural integrity of the corrosion-resistant layer 131, improving its bonding effect with the recessed portion 130.

[0039] Furthermore, the recess 130 includes a deep rib. The deep rib is used to form a reinforcing rib in the injection molded product. By forming a corrosion-resistant layer 131 within the deep rib, residual injection molding material can be prevented from corroding the interior of the deep rib, ensuring the structural integrity of the deep rib, extending the service life of the injection mold 100, and improving the finished quality of the reinforcing rib in the injection molded product formed by the deep rib, thereby greatly reducing production costs.

[0040] To further improve the performance of the injection mold 100, the corrosion-resistant layer 131 can also have a low coefficient of friction. In some descriptions, the corrosion-resistant layer 131 can also be described as a lubricating layer. While reducing or preventing corrosion of the recess 130 by residual injection molding material, it can also reduce or prevent the residue of injection molding material in the recess 130, further improving the service life of the injection mold 100 and the yield of injection molded products.

[0041] Specifically, the corrosion-resistant layer 131 can be any one or more of the following: TiN layer, TiAlN layer, CrAlN layer, DLC layer, or CrN layer, or other metallic or non-metallic compound layers. The aforementioned corrosion-resistant layer 131 features a low coefficient of friction, high hardness, wear resistance, and corrosion resistance. On one hand, the corrosion-resistant layer 131 of the recess 130 provides wear and corrosion resistance, extending the service life of the injection mold 100, preventing residual injection material from corroding the recess 130, and preventing rust or wear on the recess 130 from leaving defects on the surface of the injection molded product, thus improving the yield rate of the injection molded product. On the other hand, the corrosion-resistant layer 131 has a low coefficient of friction, resulting in low friction between the recess 130 and the injection molded product, allowing for smoother relative movement, reducing or preventing residual injection material within the recess 130, further extending the service life of the injection mold 100.

[0042] In some embodiments, the corrosion-resistant layer 131 is formed using a physical vapor deposition (PVD) process or a plasma-enhanced chemical vapor deposition (PECVD) process. The corrosion-resistant layer 131 formed using the aforementioned PVD process or PCVD process has a low coefficient of friction, high hardness, good wear resistance, and corrosion resistance, making it easier for the recessed portion 130 to possess wear resistance, corrosion resistance, and self-lubricating properties. Furthermore, the corrosion-resistant layer 131 formed using the aforementioned PVD process or PCVD process has a more uniform shape and a stronger bond with the recessed portion 130, which can improve the service life of the injection mold 100. It should be noted that the deposition process used for the corrosion-resistant layer 131 can be any known existing deposition process, and this invention is not limited to it; of course, in other embodiments, other methods such as coating or electroplating can also be used to form the corrosion-resistant layer 131.

[0043] The thickness of the corrosion-resistant layer 131 is 2.5μm-4μm. For example, 2.5μm, 2.7μm, 3μm, 3.2μm, 3.5μm, 3.8μm, or 4μm. Within the above thickness range, the thickness of the corrosion-resistant layer 131 is suitable, allowing for a firm bond with the recess 130, and providing good corrosion resistance and self-lubrication.

[0044] It should be noted that the injection mold 100 may have a lubricating layer 121 formed only on the surface of the movable part 120 that is in contact with the mold body 110; or it may have a corrosion-resistant layer 131 formed only on the surface of the recess 130. Alternatively, the injection mold 100 may have a lubricating layer 121 formed on both the surface of the movable part 120 that is in contact with the mold body 110 and the surface of the recess 130. Furthermore, the corrosion-resistant layer 131 used in the recess 130 and the lubricating layer 121 used in the movable part 120 may be formed using the same process and the same material, thereby simplifying the manufacturing process of the injection mold 100. In this case, a material with both low coefficient of friction, high hardness, and high wear and corrosion resistance can be used to form both the lubricating layer 121 and the corrosion-resistant layer 131. Alternatively, the corrosion-resistant layer 131 used in the recess 130 of the injection mold 100 and the lubricating layer 121 used in the moving part 120 can be formed using different processes and / or different materials. The molding material selected for the lubricating layer 121 focuses more on its low coefficient of friction, while the molding material selected for the corrosion-resistant layer 131 focuses more on high hardness and high wear and corrosion resistance. No restrictions are imposed here.

[0045] Another embodiment of this application provides an injection-molded article, which is injection molded using the injection mold 100 in any of the above embodiments. The injection-molded article includes a door panel, a control panel, or other products.

[0046] The injection mold 100 includes a mold body 110 and a movable part 120. The movable part 120 has a lubricating layer 121 formed on at least the surface of the area that comes into contact with the mold body 110. Because the friction between the movable part 120 and the mold body 110 is small, their relative movement is smooth, reducing or even eliminating problems with poor demolding, thus improving the production efficiency and product quality of the injection molded products. The lubricating layer 121 achieves a self-lubricating effect between the movable part 120 and the mold body 110, reducing or eliminating the need for lubrication and maintenance procedures between the movable part 120 and the mold body 110, saving significant maintenance costs, and reducing the residue of lubricating oil and other impurities that could leave oil stains or other defects on the surface of the injection molded products, thereby improving the yield rate of the injection molded products.

[0047] The injection mold 100 also includes a recessed portion 130. The recessed portion 130 is disposed on the mold body 110 and is recessed to form the raised structure of the injection molded product. A corrosion-resistant layer 131 is formed on the surface of the recessed portion 130. Because the recessed portion 130 of the injection mold 100 for producing injection molded products has a corrosion-resistant layer 131, the structural integrity of the recessed portion 130 can be ensured, preventing rust or wear that could leave defects on the surface of the injection molded product. This improves the finished product quality of the reinforcing ribs and other parts of the injection molded product formed by the recessed portion 130, thereby increasing the overall yield rate of the injection molded product and significantly reducing production costs.

[0048] It should be noted that the terms "horizontal" and "vertical" do not imply that the components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. Similarly, the terms "parallel" and "perpendicular" do not imply that the components are absolutely parallel or perpendicular, but rather that they can have a certain angular deviation. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted. In addition, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships that are commonly used when the product of this application is in use. They are only for the purpose of describing the embodiments of this application 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. Therefore, they should not be construed as limitations on this application.

[0049] It is understood that in this document, "multiple" means at least two, such as two, three, etc., unless otherwise specified. Furthermore, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. The term "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0050] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An injection mold characterized in that, include: Mold body; The movable component is movably mounted on the mold body; The movable part has a lubricating layer formed on at least the surface of the area for moving contact with the mold body.

2. The injection mold of claim 1, wherein The lubricating layer is integrally formed on the outer surface of the moving part.

3. The injection mold of claim 1, wherein, The movable component includes one or more of the following: ejector pin, push plate, and slider.

4. The injection mold of claim 1, wherein, The lubricating layer is formed using physical vapor deposition or plasma-enhanced chemical vapor deposition.

5. The injection mold of claim 1, wherein, The lubricating layer includes any one or more of TiN, TiAlN, CrAlN, DLC, and CrN layers; and / or the thickness of the lubricating layer is 2.5 μm to 4 μm.

6. Injection mold according to any one of claims 1 to 5, characterized in that The injection mold also includes: A recessed portion is provided in the mold body. The recessed portion is recessed and is used to form a raised structure of the injection molded product. A corrosion-resistant layer is formed on the surface of the recessed portion.

7. The injection mold according to claim 6, characterized in that, The recessed portion includes deep ribs, which are used to form reinforcing ribs in the injection molded product.

8. The injection mold of claim 6, wherein, The corrosion-resistant layer is formed using physical vapor deposition or plasma-enhanced chemical vapor deposition.

9. The injection mold of claim 6, wherein, The corrosion-resistant layer includes any one or more of TiN, TiAlN, CrAlN, DLC, and CrN layers; and / or, the thickness of the lubricating layer is 2.5 μm to 4 μm.

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