Injection molding apparatus and injection molding machine
By introducing heating elements on the outer peripheral walls of the upper and lower mold cores into the injection molding unit, the problem of uneven heating was solved, achieving a rapid and uniform heating effect and improving the surface quality of large products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG FENGYE PLASTIC TECHNOLOGY CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-06-12
AI Technical Summary
In existing injection molds, uneven heating by the heating coil during multi-cavity injection molding results in surface defects on large products.
First and second heating elements are introduced into the injection molding device and installed on the outer peripheral walls of the upper mold core and the lower mold core, respectively. Through the joint cooperation of the heating coil, the first heating element and the second heating element, the molding cavity is heated quickly and evenly.
It achieves rapid and uniform heating of the liquid in the molding cavity, thus improving the surface quality of large products.
Smart Images
Figure CN224348271U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of injection mold technology, and in particular to an injection molding apparatus and an injection molding machine. Background Technology
[0002] Injection molds are the core tools in plastic molding processes. They inject high-temperature molten plastic into a sealed cavity, which then cools and molds the product into the desired shape. In existing technologies, to reduce the viscosity of the liquid and minimize surface defects, heating coils are typically installed inside the mold core. These heating coils use resistance heating to transfer heat into the cavity.
[0003] For example, Chinese patent application number CN202123139452.2 discloses a multi-cavity injection mold for an electrically heated mobile phone upper shell, including an upper base plate, an upper template, an upper mold core, a lower base plate, a pad plate, a lower template, a lower mold core, an ejector plate, a guide assembly, and ejector pins. The upper base plate is provided with a main sprue, a runner plate, and secondary sprues. There are multiple secondary sprues, and the multiple secondary sprues are evenly distributed at the four corners of the runner plate. Heating coils are provided on both the upper and lower sides of the runner plate.
[0004] However, the above-mentioned injection mold structural design has the following problems during use:
[0005] In multi-cavity injection molding, the aforementioned injection molds utilize electric heating coils installed at the runner plate. These coils transfer heat to the cavity through resistance heating, improving injection quality. However, the area of the electric heating coils is limited, allowing for rapid heating only in specific areas of the mold core (such as the core and cavity edges). Therefore, heating coils are suitable for thin-walled or miniature products requiring localized temperature control, such as SIM card trays. For large molds, such as automotive parts, the heating coils suffer from uneven heating, leading to surface defects in the product.
[0006] Therefore, there is an urgent need for an injection mold that can heat up quickly and evenly. Utility Model Content
[0007] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an injection molding apparatus and injection molding machine that can heat up quickly and evenly.
[0008] The purpose of this disclosure is achieved through the following technical solution:
[0009] An injection molding apparatus includes an upper mold plate, a lower mold plate, and a heating coil. The upper mold plate and the lower mold plate are disposed opposite to each other. An upper mold core is disposed within the upper mold plate, and a lower mold core is disposed within the lower mold plate. When the upper mold core and the lower mold core abut against each other, they together form a molding cavity and an insert hole. The molding cavity and the insert hole are disposed adjacent to each other. The molding cavity is used for injection molding products, and the heating coil is embedded in the insert hole.
[0010] The injection molding device further includes a first heating element and a second heating element. The outer peripheral wall of the upper mold core is provided with a first receiving groove, and the first heating element is installed in the first receiving groove so that the first heating element heats the upper mold core. The outer peripheral wall of the lower mold core is provided with a second receiving groove, and the second heating element is installed in the second receiving groove so that the second heating element heats the lower mold core.
[0011] In one embodiment, the first heating element is disposed around the outer peripheral wall of the upper mold core; and / or,
[0012] The second heating element is disposed around the outer peripheral wall of the lower mold core.
[0013] In one embodiment, the first heating element is arranged in a serpentine coil around the outer peripheral wall of the upper mold core; and / or,
[0014] The second heating element is arranged in a serpentine coil around the outer peripheral wall of the lower mold core.
[0015] In one embodiment, the first heating element is a heating tube; and / or,
[0016] The second heating element is a heating tube.
[0017] In one embodiment, the first heating element is detachably connected to the upper mold core; the second heating element is detachably connected to the lower mold core.
[0018] In one embodiment, the first heating element is bolted to the upper mold core; and / or,
[0019] The second heating element is bolted to the lower mold core.
[0020] In one embodiment, the width of the first heating element is 12mm-15mm; and / or,
[0021] The width of the second heating element is 12mm-15mm.
[0022] In one embodiment, the number of heating coils is multiple, and the multiple heating coils are spaced apart along the length of the lower mold core.
[0023] An injection molding machine includes the injection molding apparatus described in any of the above embodiments.
[0024] Compared with the prior art, this disclosure has at least the following advantages:
[0025] In the aforementioned injection molding device, the upper and lower mold cores together form a molding cavity and an insert hole. The molding cavity is used to inject liquid plastic to form a product. The molding cavity and the insert hole are arranged adjacent to each other, and a heating coil is embedded in the insert hole. The heating coil generates heat, which can be quickly transferred to the molding cavity. Furthermore, the outer peripheral wall of the upper mold core is provided with a first heating element, and the outer peripheral wall of the lower mold core is provided with a second heating element. When the first heating element heats up, it transfers heat to the upper mold core, and when the second heating element heats up, it transfers heat to the lower mold core, thereby increasing the heating area of the upper and lower mold cores. When the upper and lower mold cores are heated, they jointly transfer heat to the molding cavity, making the heating of the molding cavity more uniform. In this way, through the combined action of the heating coil, the first heating element, and the second heating element, the effect of rapid and uniform heating of the liquid in the molding cavity is achieved. Attached Figure Description
[0026] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure 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.
[0027] Figure 1 This is a schematic diagram of the injection molding device in one embodiment;
[0028] Figure 2 for Figure 1 Another schematic diagram of the injection molding device shown;
[0029] Figure 3 for Figure 1 Another schematic diagram of the injection molding device shown. Detailed Implementation
[0030] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.
[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0033] This disclosure provides an injection molding apparatus, including an upper mold plate, a lower mold plate, a heating coil, a first heating element, and a second heating element. The upper mold plate and the lower mold plate are disposed opposite to each other. An upper mold core is disposed in the upper mold plate, and a lower mold core is disposed in the lower mold plate. When the upper mold core and the lower mold core abut against each other, they together form a molding cavity and an insert hole. The molding cavity and the insert hole are disposed adjacent to each other. The molding cavity is used for injection molding products. The heating coil is embedded in the insert hole. A first receiving groove is formed on the outer peripheral wall of the upper mold core. The first heating element is installed in the first receiving groove so that the first heating element heats the upper mold core. A second receiving groove is formed on the outer peripheral wall of the lower mold core. The second heating element is installed in the second receiving groove so that the second heating element heats the lower mold core.
[0034] In the aforementioned injection molding device, the upper and lower mold cores together form a molding cavity and an insert hole. The molding cavity is used to inject liquid plastic to form a product. The molding cavity and the insert hole are arranged adjacent to each other, and a heating coil is embedded in the insert hole. The heating coil generates heat, which can be quickly transferred to the molding cavity. Furthermore, the outer peripheral wall of the upper mold core is provided with a first heating element, and the outer peripheral wall of the lower mold core is provided with a second heating element. When the first heating element heats up, it transfers heat to the upper mold core, and when the second heating element heats up, it transfers heat to the lower mold core, thereby increasing the heating area of the upper and lower mold cores. When the upper and lower mold cores are heated, they jointly transfer heat to the molding cavity, making the heating of the molding cavity more uniform. In this way, through the combined action of the heating coil, the first heating element, and the second heating element, the effect of rapid and uniform heating of the liquid in the molding cavity is achieved.
[0035] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:
[0036] like Figures 1 to 3As shown, an injection molding device 10 of one embodiment includes an upper mold plate 100, a lower mold plate 200, a heating coil (not shown), a first heating element 300, and a second heating element 400. The upper mold plate 100 and the lower mold plate 200 are disposed opposite to each other. An upper mold core 110 is provided in the upper mold plate 100, and a lower mold core 210 is provided in the lower mold plate 200. When the upper mold core 110 and the lower mold core 210 abut against each other, they together form a molding cavity 100a and an insert hole 100b. The molding cavity 100a and the insert hole 100b... The molding cavity 100a is used for injection molding products, and the heating coil is embedded in the embedding hole 100b. The outer peripheral wall of the upper mold core 110 is provided with a first receiving groove, and the first heating element 300 is installed in the first receiving groove so that the first heating element 300 heats the upper mold core 110. The outer peripheral wall of the lower mold core 210 is provided with a second receiving groove, and the second heating element 400 is installed in the second receiving groove so that the second heating element 400 heats the lower mold core 210.
[0037] In this embodiment, the upper mold core 110 is embedded in the upper mold plate, and the lower mold core 210 is embedded in the lower mold plate. When the upper mold core 110 and the lower mold core 210 are closed facing each other, the upper mold core 110 and the lower mold core 210 together form a molding cavity 100a and an insert hole 100b. Plastic liquid is injected into the molding cavity 100a to form a product of the corresponding shape. The molding cavity 100a and the insert hole 100b are arranged adjacent to each other. The heating coil is embedded in the insert hole 100b. When the heating coil is heating, it transfers heat to the upper mold core 110 and the lower mold core 210, and then quickly transfers heat to the molding cavity 100a. However, since the heating coil is located on one side of the molding cavity 100a, there is a problem of uneven heating of the liquid in the molding cavity 100a. By providing a first heating element 300 on the outer peripheral wall of the upper mold core 110 and a second heating element 400 on the outer peripheral wall of the lower mold core 210, the heating area of the upper mold core 110 and the lower mold core 210 is increased. When the first heating element 300 and the second heating element heat up, they transfer heat to the upper mold core 110 and the lower mold core 210 respectively, and then transfer the heat to the molding cavity 100a located in the middle, so that the heating in the molding cavity 100a is more uniform.
[0038] The injection molding device 10 described above has an upper mold core 110 and a lower mold core 210 forming a molding cavity 100a and an insert hole 100b. The molding cavity 100a is used to inject liquid plastic to form a product. The molding cavity 100a and the insert hole 100b are arranged adjacent to each other. The heating coil is embedded in the insert hole 100b. Heat can be quickly transferred to the molding cavity 100a by heating the coil. Furthermore, the outer peripheral wall of the upper mold core 110 is provided with a first heating element 300, and the outer peripheral wall of the lower mold core 210 is provided with a second heating element 400. When the first heating element 300 heats up, it transfers heat to the upper mold core 110, and when the second heating element 400 heats up, it transfers heat to the lower mold core 210, thereby increasing the heating area of the upper mold core 110 and the lower mold core 210. When the upper mold core 110 and the lower mold core 210 are heated, they jointly transfer heat to the molding cavity 100a, so that the heating of the molding cavity 100a is more uniform. In this way, through the joint cooperation of the heating coil, the first heating element 300 and the second heating element 400, the liquid in the molding cavity 100a is rapidly heated and heated evenly.
[0039] like Figure 2 As shown, in one embodiment, the first heating element 300 is disposed around the outer peripheral wall of the upper mold core 110. In this embodiment, the first heating element 300 is disposed around the outer peripheral wall of the upper mold core 110, that is, the first heating element 300 is provided around the outer wall of the upper mold core 110, so that when the first heating element 300 heats up, it will evenly transfer heat to the center of the upper mold core 110, thereby making the molding cavity 100a heated evenly.
[0040] like Figure 2 As shown, in one embodiment, the second heating element 400 is disposed around the outer peripheral wall of the lower mold core 210. In this embodiment, the second heating element 400 is disposed around the outer peripheral wall of the lower mold core 210, that is, the second heating element 400 is provided around the outer wall of the lower mold core 210, so that when the second heating element 400 heats up, it will evenly transfer heat to the center of the lower mold core 210, thereby making the molding cavity 100a heated evenly.
[0041] like Figure 2 As shown, in one embodiment, the first heating element 300 is coiled in a serpentine shape around the outer peripheral wall of the upper mold core 110. In this embodiment, the first heating element 300 is coiled on each side of the outer peripheral wall of the upper mold core 110, so that the first heating element 300 occupies a large area of the outer peripheral wall of the upper mold core 110, thereby making the molding cavity 100a heat up faster and more evenly.
[0042] like Figure 2As shown, in one embodiment, the second heating element 400 is coiled in a serpentine shape around the outer peripheral wall of the lower mold core 210. In this embodiment, the second heating element 400 is coiled on each side of the outer peripheral wall of the lower mold core 210, so that the second heating element 400 occupies a large area of the outer peripheral wall of the lower mold core 210, thereby making the molding cavity 100a heat up faster and more evenly.
[0043] In one embodiment, the first heating element 300 is a heating tube. In this embodiment, the first heating element 300 is a heating tube, which generates heat through resistance to transfer heat to the upper mold core 110.
[0044] In one embodiment, the second heating element 400 is a heating tube. In this embodiment, the second heating element 400 is a heating tube, which generates heat through resistance to transfer heat to the lower mold core 210.
[0045] In one embodiment, the first heating element 300 is detachably connected to the upper mold core 110; the second heating element 400 is detachably connected to the lower mold core 210. It is understood that the first heating element 300 and the second heating element 400 may be damaged after prolonged use at high temperatures, thus affecting their heating function on the upper mold core 110 and the lower mold core 210. By detachably connecting the first heating element 300 to the upper mold core 110 and the second heating element 400 to the lower mold core 210, the assembly and disassembly of the first heating element 300 and the second heating element 400 become more convenient.
[0046] In one embodiment, the first heating element 300 is bolted to the upper mold core 110. In this embodiment, both the first heating element 300 and the upper mold core 110 are provided with screw holes so that the bolts can pass through to bolt the first heating element 300 to the upper mold core 110, thereby improving the ease of assembly and disassembly of the first heating element 300.
[0047] In one embodiment, the second heating element 400 is bolted to the lower mold core 210. In this embodiment, both the first heating element 300 and the lower mold core 210 have threaded holes to allow bolts to pass through and thus bolt the second heating element 400 to the lower mold core 210, improving the ease of assembly and disassembly of the second heating element 400.
[0048] In one embodiment, the width of the first heating element 300 is 12mm-15mm. It is understood that a width of 12mm-15mm for the first heating element 300 increases the area occupied by the first heating element 300 on the outer peripheral wall of the upper mold core 110, thereby making the upper mold core 110 more evenly heated.
[0049] In one embodiment, the width of the second heating element 400 is 12mm-15mm. It is understood that a width of 12mm-15mm for the second heating element 400 increases the area occupied by the second heating element 400 on the outer peripheral wall of the lower mold core 210, thereby making the lower mold core 210 heated more evenly.
[0050] In one embodiment, there are multiple heating coils, which are spaced apart along the length of the lower mold core 210. In this embodiment, the upper mold core 110 and the lower mold core 210 together form multiple molding cavities 100a for molding multiple products at one time. A heating coil is provided between every two molding cavities 100a so that the heating coil transfers heat to the molding cavities 100a on both sides when it heats.
[0051] This application also provides an injection molding machine, including the injection molding apparatus 10 described in any of the above embodiments.
[0052] Compared with the prior art, this disclosure has at least the following advantages:
[0053] The injection molding device 10 described above has an upper mold core 110 and a lower mold core 210 forming a molding cavity 100a and an insert hole 100b. The molding cavity 100a is used to inject liquid plastic to form a product. The molding cavity 100a and the insert hole 100b are arranged adjacent to each other. The heating coil is embedded in the insert hole 100b. Heat can be quickly transferred to the molding cavity 100a by heating the coil. Furthermore, the outer peripheral wall of the upper mold core 110 is provided with a first heating element 300, and the outer peripheral wall of the lower mold core 210 is provided with a second heating element 400. When the first heating element 300 heats up, it transfers heat to the upper mold core 110, and when the second heating element 400 heats up, it transfers heat to the lower mold core 210, thereby increasing the heating area of the upper mold core 110 and the lower mold core 210. When the upper mold core 110 and the lower mold core 210 are heated, they jointly transfer heat to the molding cavity 100a, so that the heating of the molding cavity 100a is more uniform. In this way, through the joint cooperation of the heating coil, the first heating element 300 and the second heating element 400, the liquid in the molding cavity 100a is rapidly heated and heated evenly.
[0054] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent disclosure should be determined by the appended claims.
Claims
1. An injection molding apparatus, comprising an upper mold plate, a lower mold plate, and a heating coil, wherein the upper mold plate and the lower mold plate are disposed opposite to each other, the upper mold plate contains an upper mold core, the lower mold plate contains a lower mold core, and the upper mold core and the lower mold core abut against each other to form a molding cavity and an insert hole, the molding cavity and the insert hole are disposed adjacent to each other, the molding cavity is used for injection molding a product, and the heating coil is embedded in the insert hole, characterized in that... The injection molding device further includes a first heating element and a second heating element. The outer peripheral wall of the upper mold core is provided with a first receiving groove, and the first heating element is installed in the first receiving groove so that the first heating element heats the upper mold core. The outer peripheral wall of the lower mold core is provided with a second receiving groove, and the second heating element is installed in the second receiving groove so that the second heating element heats the lower mold core.
2. The injection molding apparatus according to claim 1, characterized in that, The first heating element is disposed around the outer peripheral wall of the upper mold core; and / or, The second heating element is disposed around the outer peripheral wall of the lower mold core.
3. The injection molding apparatus according to claim 1, characterized in that, The first heating element is coiled in a serpentine shape around the outer peripheral wall of the upper mold core; and / or, The second heating element is arranged in a serpentine shape around the outer peripheral wall of the lower mold core.
4. The injection molding apparatus according to claim 1, characterized in that, The first heating element is a heating tube; and / or, The second heating element is a heating tube.
5. The injection molding apparatus according to claim 1, characterized in that, The first heating element is detachably connected to the upper mold core; the second heating element is detachably connected to the lower mold core.
6. The injection molding apparatus according to claim 5, characterized in that, The first heating element is bolted to the upper mold core; and / or, The second heating element is bolted to the lower mold core.
7. The injection molding apparatus according to claim 1, characterized in that, The width of the first heating element is 12mm-15mm; and / or, The width of the second heating element is 12mm-15mm.
8. The injection molding apparatus according to claim 1, characterized in that, The number of heating coils is multiple, and the multiple heating coils are arranged at intervals along the length of the lower mold core.
9. An injection molding machine, characterized in that, The injection molding apparatus includes any one of claims 1 to 8.