Injection mold
By using a split main runner design and multi-point injection technology, the problem of large mold opening distance in injection molds has been solved, resulting in cost reduction, shorter runner cycle, and improved product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN GONGJIN ELECTRONICS CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-26
AI Technical Summary
The main runner of existing injection molds is relatively long, resulting in a large mold opening distance, requiring larger tonnage machines and increasing production costs.
The main runner adopts a split design, with the first tube and the second tube connecting and separating separately when the mold is opened and closed, shortening the mold opening distance, and achieving more uniform pressure distribution and shorter filling time through multi-point injection.
It reduces production costs, lightens the weight of the main runner, reduces the risk of mold sticking, shortens the runner molding cycle, and improves the mechanical properties and appearance quality of the product.
Smart Images
Figure CN224408312U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of injection mold technology, and more particularly to an injection mold and an injection mold. Background Technology
[0002] In injection mold design, cold runner systems are one of the most common runner design solutions. Some cold runner designs have inherent characteristics: the main runner must extend from the mold parting surface to the injection machine nozzle, which typically results in a long main runner length. A longer runner requires a larger mold opening distance to facilitate ejection and demolding of the part. The long main runner leads to a large mold opening distance and a large total mold thickness, requiring larger tonnage injection machines and increasing production costs. Utility Model Content
[0003] In view of this, this application provides an injection mold and an injection mold, which aims to solve one of the technical problems in the prior art.
[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0005] In a first aspect, this utility model provides an injection mold, including a front mold desiccant plate, a front mold base, a manifold plate, a front mold core, and a main runner. The front mold desiccant plate and the front mold base are connected sequentially along the mold opening and closing direction, and the front mold core is connected to the side of the front mold base away from the front mold desiccant plate.
[0006] The injection mold has a first channel that passes through the manifold and the front mold base along the mold opening and closing direction, and a second channel that passes through the front mold core along the mold opening and closing direction. The first channel and the second channel are connected. The front mold core has a gate on the side away from the front mold dewatering plate.
[0007] The main channel includes a first tube and a second tube. The second tube is fixed in the second channel and connects the first tube and the gate. The first tube is fixed to the front mold dewatering plate. When the mold is opened, the first tube and the second tube are separated. When the mold is closed, the first tube and the second tube are connected.
[0008] In an optional embodiment, there are multiple first tubes, which are spaced apart, and there are multiple second tubes, with one first tube and one second tube corresponding to each other.
[0009] In an optional embodiment, the outer diameter of the first tube gradually decreases in the direction from the front mold dewatering plate to the front mold core.
[0010] In an optional embodiment, the first tube includes a first main body portion and a first docking portion extending along the mold opening and closing direction. The outer diameter of the first docking portion is smaller than the outer diameter of the first main body portion. In the direction from the front mold dewatering port plate to the front mold core, the outer diameter of the first docking portion gradually decreases.
[0011] In an optional embodiment, the inner diameter of the second tube gradually increases in the direction from the front mold dewatering plate to the front mold core.
[0012] In an optional embodiment, the second tube body includes a second main body and a second connecting part. The outer diameter of the second connecting part is smaller than the outer diameter of the second main body. In the direction from the front mold dewatering plate to the front mold core, the inner diameter of the second connecting part gradually increases.
[0013] In an optional embodiment, the end of the first tube away from the front mold dewatering plate is flush with the surface of the front mold base; and / or
[0014] The end of the second tube near the front mold dewatering port plate is flush with the surface of the front mold core.
[0015] In an optional embodiment, the injection mold further includes a nozzle, and the first tube body further includes a connecting portion that connects the first body portion and the nozzle.
[0016] In an optional embodiment, the injection mold further includes a plurality of front mold angled ejectors, which are arranged around the periphery of the first tube body. The front mold core is provided with a plurality of first angled ejector holes, and one of the front mold angled ejectors passes through one of the first angled ejector holes. The front mold angled ejectors are movably connected to the front mold dewatering plate.
[0017] The injection mold also includes multiple rear mold angled ejector rods, a rear mold core, and a rear mold ejector plate. The multiple rear mold angled ejector rods are arranged around the periphery of the second tube body. The rear mold core is provided with multiple second angled ejector holes. One of the rear mold angled ejector rods passes through one of the second angled ejector holes. The rear mold angled ejector rods are movably connected to the rear mold ejector plate.
[0018] In an optional embodiment, the injection mold further includes four slides and a rear mold base. In a direction away from the front mold core, the rear mold core, the rear mold base, and the rear mold ejector plate are connected in sequence. The four slides are arranged around the periphery of the rear mold core and connected to the rear mold base.
[0019] Compared to existing technologies, the advantages of this application are as follows: This application proposes an injection mold, including a front mold sprue plate, a front mold base, a manifold plate, a front mold core, and a main runner. The front mold sprue plate and the front mold base are connected sequentially along the mold opening and closing direction. The front mold core is connected to the side of the front mold base away from the front mold sprue plate. The injection mold has a first channel that runs through the manifold plate and the front mold base along the mold opening and closing direction, and a second channel that runs through the front mold core along the mold opening and closing direction. The first channel and the second channel are connected. A gate is provided on the side of the front mold core away from the front mold sprue plate. The main runner includes a first tube and a second tube. The second tube is fixed in the second channel and connects the first tube and the gate. The first tube is fixed to the front mold sprue plate. When the mold is opened, the first tube and the second tube separate. When the mold is closed, the first tube and the second tube are connected. Thus, when the mold is closed, the first tube and the second tube are connected, guiding the molten plastic from the injection molding machine nozzle to the gate channel. By using a split design for the main runner, the first tube moves with the front mold's sprue plate for demolding, while the second tube is ejected synchronously with the molded product. During mold opening, the first tube rises with the front mold's sprue plate. Due to the short length of the first tube, the opening distance between the front mold's sprue plate and the front mold base is shortened, reducing the overall opening distance required for the injection mold. This allows smaller tonnage production machines to meet production needs and lowers production costs.
[0020] In addition, the split design of the main runner reduces its weight and the risk of sticking to the mold; it can also shorten the runner molding cycle and save costs. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 The present application shows schematic diagrams of the structure of injection molds in some embodiments;
[0023] Figure 2 This application shows a schematic diagram of the cross-sectional structure of an injection mold in some embodiments;
[0024] Figure 3 The following are schematic diagrams of the nozzle and main channel in some embodiments of this application;
[0025] Figure 4 It shows Figure 3 Enlarged structural diagram at point I;
[0026] Figure 5This application shows schematic diagrams of the mold opening stroke structure of injection molds in some embodiments;
[0027] Figure 6 A schematic diagram of the mold opening stroke structure of an injection mold in the related art is shown.
[0028] Explanation of main component symbols: 100-Injection mold; 111-Front mold desiccant plate; 112-Front mold base; 113-Manifold plate; 114-Front mold core; 115-Main runner; 1141-Gate; 118-First channel; 119-Second channel; 1151-First tube body; 1152-Second tube body; 11511-First main body; 11512-First mating part; 116-Nozzle; 11513-Connecting part; 122-Rear mold core; 123-Rear mold ejector plate; 124-Slide; 125-Rear mold base; 1241-Pressure slope; 1242-Alignment groove; 1143-Alignment protrusion. Detailed Implementation
[0029] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing 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, and therefore should not be construed as a limitation of this application.
[0031] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0034] like Figure 6 As shown, in Figure 6 The main runner 115 in the middle is relatively long. When the mold is opened, the distance between L2 (front mold dewatering plate 111 and front mold base 112) is relatively large, which makes the overall mold opening distance (L1+L2+L3) required for the injection mold 100 large. This requires a larger tonnage machine to meet the production needs and increases the production cost.
[0035] In response to the above problems, such as Figure 1 and Figure 2 As shown, an embodiment of this application provides an injection mold 100. As... Figure 1 The injection mold 100 includes a front mold desqueezing plate 111, a front mold base 112, a manifold 113, a front mold core 114, and a main runner 115. The main runner 115 is a channel for guiding molten plastic from the injection molding machine nozzle 116 to the gate 1141.
[0036] The front mold dewatering plate 111 and the front mold base 112 are connected in sequence along the mold opening and closing direction, and the front mold core 114 is connected to the side of the front mold base 112 away from the front mold dewatering plate 111.
[0037] The injection mold 100 has a first channel 118 that runs through the manifold 113 and the front mold base 112 in the mold opening and closing direction. The injection mold 100 also has a second channel 119 that runs through the front mold core 114 in the mold opening and closing direction. The first channel 118 and the second channel 119 are connected. The front mold core 114 has a gate 1141 on the side away from the front mold dewatering plate 111.
[0038] The main runner 115 includes a first tube 1151 and a second tube 1152. The second tube 1152 is fixed to the second channel 119 and connects the first tube 1151 and the gate 1141. The first tube 1151 is fixed to the front mold dewatering plate 111. Thus, during mold closing, the first tube 1151 and the second tube 1152 are connected, guiding the molten plastic from the injection molding machine nozzle 116 to the channel of the gate 1141. (See also...) Figure 5 By using a split design for the main runner 115, the first tube 1151 moves with the front mold desinking plate 111 for demolding, while the second tube 1152 is ejected synchronously with the molded product. During mold opening, the first tube 1151 rises with the front mold desinking plate 111. Due to the short length of the first tube 1151, the mold opening distance between the front mold desinking plate 111 and the front mold base 112 is shortened, reducing the overall mold opening distance (L1+L4+L5) required for the injection mold 100. This allows small-tonnage production machines to meet production needs and reduces production costs.
[0039] In addition, the split design of the main runner 115 reduces its weight and the risk of sticking to the mold; it can also shorten the runner molding cycle and save costs.
[0040] In some embodiments, such as Figure 3 As shown, there are multiple first tubes 1151, spaced apart, and multiple second tubes 1152, with one first tube 1151 corresponding to one second tube 1152. By using multiple first tubes 1151 and second tubes 1152, multi-point injection is achieved. Molten material is injected simultaneously into the mold cavity through multiple injection ports, resulting in more uniform pressure distribution and shorter filling time. Furthermore, multi-point injection reduces weld lines, improving the mechanical properties and appearance quality of the product.
[0041] In some embodiments, in the direction from the front mold dewatering plate 111 to the front mold core 114, the outer diameter of the first tube 1151 gradually decreases, for example, by... Figure 3 The first tube 1151 is designed with the same structure as the second tube 1152.
[0042] In one embodiment, the cross-section of the first tube 1151 is circular, D-shaped, or other closed-edge shape. The outer diameter of the first tube 1151 gradually decreases to facilitate the docking of the first tube 1151 and the second tube 1152 during mold closing.
[0043] In some embodiments, such as Figure 3As shown, the first tube body 1151 includes a first main body portion 11511 and a first docking portion 11512 extending along the mold opening and closing direction. The outer diameter of the first docking portion 11512 is smaller than the outer diameter of the first main body portion 11511. In the direction from the front mold dewatering port plate 111 to the front mold core 114, the outer diameter of the first docking portion 11512 gradually decreases.
[0044] For example, such as Figure 4 The outer diameter of the first main body 11511 near the first docking part 11512 is D1, and the outer diameters of the two ends of the first docking part 11512 are D2 and D3 respectively, satisfying: 0.75≤D2 / D1≤0.85; 0.5≤D3 / D2≤0.5, so as to reduce the pressure loss of the melt flowing in the first docking part 11512, make the melt flow more smoothly in the first tube 1151 and the second tube 1152, and also reduce the overflow of the melt from the connection between the first tube 1151 and the second tube 1152.
[0045] Specifically, D2 / D1 can be ratios such as 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, etc., which are not limited to the examples.
[0046] Specifically, D3 / D2 can be ratios such as 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, etc., which are not limited to the examples.
[0047] In some embodiments, such as Figure 3 As shown, in the direction from the front mold dewatering plate 111 to the front mold core 114, the inner diameter of the second tube 1152 gradually increases to reduce melt flow resistance, lower pressure loss, and improve filling efficiency. Furthermore, the larger inner diameter of the second tube 1152 allows the melt to fill the mold cavity more quickly, shortening the injection molding cycle.
[0048] like Figure 4 The inner diameter of the end of the second tube 1152 near the first tube 1151 is D4, satisfying: 0.6≤D3 / D4≤0.7. This reduces the overflow of molten material from the connection between the first tube 1151 and the second tube 1152.
[0049] Specifically, D3 / D4 can be ratios such as 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, etc., which are not limited to the examples.
[0050] In some embodiments, the second tube 1152 includes a second main body and a second mating portion. The outer diameter of the second mating portion is smaller than the outer diameter of the second main body, and the inner diameter of the second mating portion gradually increases in the direction from the front mold dewatering plate 111 to the front mold core 114. For example, ... Figure 3 The second tube 1152 is designed with the same structure as the first tube 1151.
[0051] In some embodiments, the end of the first tube 1151 away from the front mold dewatering port plate 111 is flush with the surface of the front mold base 112, reducing interference between the first tube 1151 and the second tube 1152 that could cause deformation at the end of the first tube 1151, and reducing the maintenance frequency of the first tube 1151.
[0052] In some embodiments, the end of the second tube 1152 near the front mold dewatering port plate 111 is flush with the surface of the front mold core 114, reducing interference between the second tube 1152 and the first tube 1151 that causes deformation at the end of the second tube 1152 and reducing the maintenance frequency of the second tube 1152.
[0053] In some embodiments, the injection mold 100 further includes a nozzle 116, and the first tube 1151 further includes a connecting portion 11513, which connects the first main body 11511 and the nozzle 116.
[0054] like Figure 3 As shown, the connecting part 11513 is vertically connected to the first main body part 11511, so that part of the first tube 1151 extends along the vertical mold opening direction, reducing the length of the first tube 1151.
[0055] In some embodiments, such as Figure 2 As shown, the injection mold 100 also includes multiple front mold angled ejector pins, which are arranged around the periphery of the first tube 1151. The front mold core 114 has multiple first angled ejector holes, and one front mold angled ejector pin passes through one of these holes. The front mold angled ejector pins are movably connected to the front mold dewatering plate 111. The front mold angled ejectors are mainly used to address undercut or recessed features on the front mold side of the product, enabling smooth demolding. By setting the front mold angled ejectors, the injection mold 100 of this application can form some complex geometric shapes, such as undercuts and holes.
[0056] In some embodiments, such as Figure 2As shown, the injection mold 100 also includes multiple rear mold angled ejector pins, a rear mold core 122, and a rear mold ejector plate 123. The multiple rear mold angled ejector pins are arranged around the periphery of the second tube 1152. The rear mold core 122 has multiple second angled ejector holes, and one rear mold angled ejector pin passes through one second angled ejector hole. The rear mold angled ejector pins are movably connected to the rear mold ejector plate 123. The rear mold angled ejector pins are mainly used to address undercut or recessed features on the rear mold side of the product, enabling smooth demolding. By setting the rear mold angled ejector pins, the injection mold 100 of this application can form some complex geometric shapes, such as undercuts and holes.
[0057] In some embodiments, such as Figure 2 The injection mold 100 also includes four slides 124 and a rear mold base 125. In the direction away from the front mold core 114, the rear mold core 122, the rear mold base 125 and the rear mold ejector plate 123 are connected in sequence. The four slides 124 are arranged around the periphery of the rear mold core 122 and connected to the rear mold base 125.
[0058] The slide 124 is slidably connected to the rear mold base 125 and is located on the rear mold core 122. The rear mold base 125 has four slide grooves, and each slide 124 is located in one of the slide grooves. When the mold is closed and opened, the slide 124 slides inward and outward along the slide grooves, respectively. When the mold is closed, the slide 124 slides closer to the rear mold core 122, and when the mold is opened, it slides away from the rear mold core 122.
[0059] See Figure 2 The slide 124 has a pressure-receiving inclined surface 1241 on its outer side, which slopes inward from bottom to top. Referring to the figure, the front mold base 112 has a pressure-applying inclined surface parallel to the pressure-receiving inclined surface 1241, which connects with it. When the mold closes, the front mold base 112 moves downward, and the pressure-applying inclined surface presses down on the pressure-receiving inclined surface 1241, driving the slide 124 to smoothly slide inward towards the rear mold core 122. The slide 124 has a alignment groove 1242, and the front mold core 114 correspondingly has an alignment protrusion 1143. When the mold closes, the alignment protrusion 1143 is inserted into the corresponding alignment groove 1242 to ensure accurate alignment between the front mold core 114 and the slide 124.
[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0061] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. An injection mold, characterized in that, It includes a front mold dewatering plate, a front mold base, a flow divider plate, a front mold core, and a main flow channel. The front mold dewatering plate and the front mold base are connected sequentially along the mold opening and closing direction. The front mold core is connected to the side of the front mold base away from the front mold dewatering plate. The injection mold has a first channel that passes through the manifold and the front mold base along the mold opening and closing direction, and a second channel that passes through the front mold core along the mold opening and closing direction. The first channel and the second channel are connected. The front mold core has a gate on the side away from the front mold dewatering plate. The main channel includes a first tube and a second tube. The second tube is fixed in the second channel and connects the first tube and the gate. The first tube is fixed to the front mold dewatering plate. When the mold is opened, the first tube and the second tube are separated. When the mold is closed, the first tube and the second tube are connected.
2. The injection mold according to claim 1, characterized in that, There are multiple first tubes, which are spaced apart. There are also multiple second tubes, with one first tube and one second tube corresponding to each other.
3. The injection mold according to claim 2, characterized in that, In the direction from the front mold dewatering port plate to the front mold core, the outer diameter of the first tube gradually decreases.
4. The injection mold according to claim 2, characterized in that, The first tube includes a first main body and a first connecting part extending along the opening and closing mold direction. The outer diameter of the first connecting part is smaller than the outer diameter of the first main body. In the direction from the front mold dewatering port plate to the front mold core, the outer diameter of the first connecting part gradually decreases.
5. The injection mold according to claim 3 or 4, characterized in that, In the direction from the front mold dewatering port plate to the front mold core, the inner diameter of the second tube gradually increases.
6. The injection mold according to claim 3 or 4, characterized in that, The second tube body includes a second main body and a second connecting part. The outer diameter of the second connecting part is smaller than the outer diameter of the second main body. In the direction from the front mold dewatering plate to the front mold core, the inner diameter of the second connecting part gradually increases.
7. The injection mold according to claim 2, characterized in that, The end of the first tube away from the front mold dewatering port plate is flush with the surface of the front mold base; and / or The end of the second tube near the front mold dewatering port plate is flush with the surface of the front mold core.
8. The injection mold according to claim 4, characterized in that, The injection mold further includes a nozzle, and the first tube body further includes a connecting portion, which connects the first main body and the nozzle.
9. The injection mold according to claim 2, characterized in that, The injection mold also includes a plurality of front mold angled ejectors, which are arranged around the periphery of the first tube body. The front mold core is provided with a plurality of first angled ejector holes, and one front mold angled ejector passes through one of the first angled ejector holes. The front mold angled ejector is movably connected to the front mold dewatering plate. The injection mold also includes multiple rear mold angled ejector rods, a rear mold core, and a rear mold ejector plate. The multiple rear mold angled ejector rods are arranged around the periphery of the second tube body. The rear mold core is provided with multiple second angled ejector holes. One of the rear mold angled ejector rods passes through one of the second angled ejector holes. The rear mold angled ejector rods are movably connected to the rear mold ejector plate.
10. The injection mold according to claim 9, characterized in that, The injection mold also includes four slides and a rear mold base. In the direction away from the front mold core, the rear mold core, the rear mold base, and the rear mold ejector plate are connected in sequence. The four slides are arranged around the periphery of the rear mold core and connected to the rear mold base.