Plastic ornament forming mold capable of being rapidly cooled

Abstract

The utility model discloses a plastic ornament forming mold capable of being quickly cooled. The plastic ornament forming mold comprises a top plate, an upper mold plate, a lower mold plate, a bottom plate, a first cooling pipeline, a second cooling pipeline and a thermocouple, a mold core inlaying seat is embedded in the bottom of the upper mold plate, a mold cavity inlaying seat is embedded in the top of the lower mold plate, the surfaces of the mold core inlaying seat and the mold cavity inlaying seat are respectively provided with a shunting channel, the wall surface of each shunting channel is coated with a boron nitride coating, a first cooling pipeline is arranged in the mold core inlaying seat, and a second cooling pipeline is arranged in the mold cavity inlaying seat. And thermocouples are respectively arranged in the mold core inlaying seat and the mold cavity inlaying seat and are used for sensing the temperature of the ornament in the forming cavity. According to the utility model, the wall surface of the shunting channel is coated with the boron nitride coating, so that the flow resistance of molten plastic can be reduced, and the boron nitride has high heat-conducting property, so that the cooling can be accelerated; and through the arrangement of the first cooling pipeline and the second cooling pipeline, heat around the forming cavity can be rapidly taken away, and buckling deformation caused by local overheating is prevented.

Description

Technical Field

[0001] This utility model relates to the field of plastic jewelry molding molds, and in particular to a plastic jewelry molding mold that can be rapidly cooled. Background Technology

[0002] Plastic decorative items are decorative products manufactured through injection molding. They are widely used in daily life and home decoration. Because injection molded decorative items have relatively fine textures and thin wall thicknesses, the cooling performance of the injection mold is required during the production process. This is because the cooling effect of the mold affects the molding quality and production efficiency of the decorative items. Uneven cooling can lead to problems such as warping, shrinkage marks, and poor surface gloss.

[0003] In existing technologies, traditional plastic decorative molds typically rely solely on cooling pipes to cool the molded product, resulting in low cooling efficiency. This causes the decorative items to remain at high temperatures for extended periods, making their surfaces susceptible to defects such as bubbles, weld lines, and flow marks, thus affecting the product's molding quality. Furthermore, the slow cooling rate prolongs the solidification time of the melt, preventing the plastic within the mold cavity from solidifying quickly. This extends the mold opening time and production cycle, reducing product production efficiency.

[0004] Therefore, existing technologies have shortcomings and need to be improved. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a plastic jewelry molding mold that can be quickly cooled, which improves product production efficiency and molding quality.

[0006] To achieve this objective, the present invention adopts the following technical solution: a plastic jewelry molding mold that can be rapidly cooled, comprising a top plate, an upper template, a lower template, a bottom plate, a first cooling pipe, a second cooling pipe, and a thermocouple;

[0007] The top plate is located at the top of the upper template, the bottom plate is located at the bottom of the lower template, the upper template is located above the lower template, and the upper template and the lower template are slidably connected by guide posts;

[0008] The bottom of the upper template is provided with a core insert, and the top of the lower template is provided with a cavity insert. The surfaces of the core insert and the cavity insert are respectively provided with flow channels. The walls of the flow channels are coated with boron nitride coating. A molding chamber for injection molding decorative items is formed between the upper and lower flow channels.

[0009] The first cooling pipe is disposed in the core insert, and the second cooling pipe is disposed in the cavity insert. The first cooling pipe and the second cooling pipe are used to introduce cooling medium.

[0010] Thermocouples are respectively provided in the core insert and the cavity insert, and the thermocouples are used to sense the temperature of the decorative item inside the molding cavity.

[0011] The above technical solution includes a slanted core-pulling mechanism in the rapidly cooling plastic jewelry molding mold, which is located at the side end of the molding chamber.

[0012] The inclined core-pulling mechanism includes an inclined guide post, a movable seat, a core-pulling insert, and a pressure plate. The lower template has core-pulling grooves on both sides, and the movable seat is located in the core-pulling grooves.

[0013] One end of the core-pulling insert is connected to the side wall of the movable seat, and the other end of the core-pulling insert extends into the molding chamber. The core-pulling insert is used to mold the inner hole shape of the injection-molded decorative item.

[0014] The movable seat is provided with an inclined hole, the inclined guide post is located in the inclined hole, and the top of the inclined guide post is connected to the upper template. The inclined guide post is used to push the movable seat to reciprocate in the core-pulling groove as the upper template moves.

[0015] Using the above technical solution, in the rapidly cooling plastic jewelry molding mold, both the core insert and the cavity insert are made of beryllium copper.

[0016] The rapidly cooling plastic jewelry molding mold, as described above, also includes a wear-resistant plate, which is disposed on the core-pulling groove.

[0017] In the above technical solution, the first cooling pipe and the second cooling pipe in the rapidly cooling plastic jewelry molding mold are arranged in a rectangular structure.

[0018] The rapidly cooling plastic jewelry molding mold, using the above technical solution, further includes a flow rate control system. The first cooling pipe and the second cooling pipe are respectively connected to the flow rate control system. The flow rate control system is used to adjust the flow rate of the cooling medium in the first cooling pipe and the second cooling pipe based on the temperature detected by the thermocouple.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention features a core insert at the bottom of the upper mold and a cavity insert at the top of the lower mold, with boron nitride coating applied to the walls of the flow channels on their surfaces. This reduces frictional resistance between the molten plastic and the mold walls, optimizing melt flow and preventing defects such as weld lines and flow marks. The boron nitride coating also has high thermal conductivity, accelerating the cooling of the injection-molded decorative parts. The core insert and cavity insert are equipped with a first cooling pipe and a second cooling pipe to quickly remove heat and prevent warping caused by localized overheating. By installing thermocouples inside the core insert and cavity insert and connecting them to a flow rate control system, the temperature changes within the molding cavity can be monitored in real time, allowing for control of the cooling medium's flow rate, volume, or temperature, achieving zoned temperature control and improving cooling efficiency and molding accuracy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the inclined core-pulling mechanism of this utility model;

[0026] Figure 4 This is a schematic diagram of the installation structure of the second cooling pipe of this utility model. Detailed Implementation

[0027] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0029] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 4 As shown, this utility model embodiment provides a rapidly cooling plastic jewelry molding die, including a top plate 1, an upper mold plate 2, a lower mold plate 3, a bottom plate 4, a first cooling pipe 5, a second cooling pipe 6, and a thermocouple 7. The top plate 1 is located on top of the upper mold plate 2, the bottom plate 4 is located at the bottom of the lower mold plate 3, the upper mold plate 2 is located above the lower mold plate 3, and the upper mold plate 2 and the lower mold plate 3 are slidably connected by guide posts 20. A core insert 21 is embedded at the bottom of the upper mold plate 2, and a cavity insert 31 is embedded at the top of the lower mold plate 3. The surfaces of the core insert 21 and the cavity insert 31 are respectively provided with flow diversion channels 300, and the walls of the flow diversion channels 300 are coated with a boron nitride coating. The upper and lower flow diversion channels... A molding chamber for injection molding decorative items is formed between 300. A flow channel 300 is provided on the surface of the core insert 21 and the cavity insert 31, and a boron nitride coating is applied to the wall of the flow channel 300. The flow channel 300 serves as the flow path for molten plastic within the mold, allowing the molten plastic to evenly fill the entire molding chamber. The boron nitride coating has excellent lubricity and high-temperature resistance, reducing the frictional resistance between the molten plastic and the mold wall during flow, thereby reducing the shear force of the melt during flow and avoiding defects such as weld lines and flow marks caused by poor flow. In addition, the boron nitride coating has a high thermal conductivity, forming an efficient heat conduction channel between the plastic decorative item and the mold, thereby reducing heat conduction resistance and accelerating the cooling rate of the decorative item.

[0031] The first cooling pipe 5 is located inside the core insert 21, and the second cooling pipe 6 is located inside the cavity insert 31. The first cooling pipe 5 and the second cooling pipe 6 are used to introduce cooling medium. This arrangement ensures that the molten plastic can dissipate heat evenly in every area of ​​the molding cavity, avoiding problems such as local overheating or uneven cooling. The core insert 21 and the cavity insert 31 are respectively equipped with thermocouples 7. The thermocouples 7 are used to sense the temperature of the decorative items inside the molding cavity. The thermocouples 7 can monitor the temperature changes inside the mold molding cavity in real time and feed back to the temperature control system to adjust the flow rate, flow rate or temperature of the cooling medium, thereby achieving precise temperature control.

[0032] like Figure 2 and Figure 3 As shown, it further includes an inclined core-pulling mechanism 8, which is located at the side end of the molding chamber. The inclined core-pulling mechanism 8 includes an inclined guide post 81, a movable seat 82, a core-pulling insert 83, and a pressure plate 84. The lower template 3 has core-pulling grooves 30 on both sides. The movable seat 82 is located in the core-pulling groove 30. One end of the core-pulling insert 83 is connected to the side wall of the movable seat 82, and the other end of the core-pulling insert 83 extends into the molding chamber. The core-pulling insert 83 is used to mold the inner hole shape of the injection-molded decorative item. The movable seat 82 has an inclined hole 820. The inclined guide post 81 is located in the inclined hole 820, and the top of the inclined guide post 81 is connected to the upper template 2. The inclined guide post 81 is used to push the movable seat 82 to reciprocate within the core-pulling groove 30 as the upper template 2 moves. When the mold is closed, the upper mold plate 2 moves downward. The top of the inclined guide post 81, being fixedly connected to the upper mold plate 2, can descend along with the upper mold plate 2 and slide downward along the inclined hole 820 in the moving seat 82 using its tilt angle. Since the movement of the inclined guide post 81 has a horizontal component force, while pushing itself downward, it will cause the moving seat 82 to slide along the core-pulling groove 30 set on both sides of the lower mold plate 3 towards the molding cavity, driving the core-pulling insert 83, which is fixedly connected to the moving seat 82, to be inserted into the molding cavity, thereby completing the molding of the inner hole in the closed state of the mold. Conversely, when the upper mold plate 2 rises, the inclined guide post 81 retracts accordingly and, guided by the inclined hole 820, drives the moving seat 82 to move away from the molding cavity along the core-pulling groove 30. The core-pulling insert 83 then exits the molding cavity, allowing the inner hole part of the decorative item to be demolded smoothly. This setting allows the action of the inclined core-pulling mechanism 8 to be synchronized with the opening and closing action of the mold, thereby simplifying the mold structure and improving demolding efficiency.

[0033] Furthermore, both the core insert 21 and the cavity insert 31 are made of beryllium copper. Beryllium copper has excellent thermal conductivity, which can quickly absorb the heat emitted by the molten plastic and conduct it to the internal cooling channels, thereby improving cooling efficiency, accelerating the solidification process of the plastic, and shortening the molding cycle.

[0034] like Figure 3 As shown, it further includes a wear-resistant plate 85, which is disposed on the core-pulling slide 30. This arrangement can effectively reduce the frictional loss of the moving seat 82 during the sliding process. Moreover, as a replaceable component, the wear-resistant plate 85 can be replaced separately after the wear reaches a certain level, avoiding the need to repair or replace the entire lower mold plate 3 due to damage to the core-pulling slide 30, thereby reducing maintenance costs and improving the overall service life of the mold.

[0035] like Figure 2 and Figure 4 As shown, the first cooling pipe 5 and the second cooling pipe 6 are arranged in a rectangular structure. This arrangement can form a surrounding cooling layout around the molding cavity inside the core insert 21 and the cavity insert 31, so that the flow path of the cooling medium inside the mold covers a wider area, thereby more effectively removing heat.

[0036] Furthermore, a flow rate control system (not shown) is also included. The first cooling pipe 5 and the second cooling pipe 6 are respectively connected to the flow rate control system. The flow rate control system is used to adjust the flow rate of the cooling medium in the first cooling pipe 5 and the second cooling pipe 6 based on the temperature detected by the thermocouple 7. The thermocouple 7 in the mold can sense the temperature changes in each area in real time and feed the temperature data back to the flow rate control system. The flow rate control system can automatically adjust the flow rate of the cooling medium in the first cooling pipe 5 and the second cooling pipe 6 according to the temperature information detected by the thermocouple 7. Specifically, when the temperature in a certain area is high and the cooling rate is slow, the flow rate control system will increase the flow rate of the cooling medium in the corresponding cooling pipe of that area to improve heat dissipation efficiency and thus quickly reduce the temperature of that area. Through this dynamic adjustment method, the flow rate control system can achieve precise temperature control in different zones according to the actual temperature distribution in the mold, avoiding quality defects such as product warping, shrinkage marks, and weld lines caused by uneven cooling.

[0037] This invention features a core insert at the bottom of the upper mold and a cavity insert at the top of the lower mold, with boron nitride coating applied to the walls of the flow channels on their surfaces. This reduces frictional resistance between the molten plastic and the mold walls, optimizing melt flow and preventing defects such as weld lines and flow marks. The boron nitride coating also has high thermal conductivity, accelerating the cooling of the injection-molded decorative parts. The core insert and cavity insert are equipped with a first cooling pipe and a second cooling pipe to quickly remove heat and prevent warping caused by localized overheating. By installing thermocouples inside the core insert and cavity insert and connecting them to a flow rate control system, the temperature changes within the molding cavity can be monitored in real time, allowing for control of the cooling medium's flow rate, volume, or temperature, achieving zoned temperature control and improving cooling efficiency and molding accuracy.

[0038] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rapidly coolable plastic ornament forming mold characterized by, It includes a top plate, upper template, lower template, bottom plate, first cooling pipe, second cooling pipe, and thermocouples; The top plate is located at the top of the upper template, the bottom plate is located at the bottom of the lower template, the upper template is located above the lower template, and the upper template and the lower template are slidably connected by guide posts; The bottom of the upper template is provided with a core insert, and the top of the lower template is provided with a cavity insert. The surfaces of the core insert and the cavity insert are respectively provided with flow channels. The walls of the flow channels are coated with boron nitride coating. A molding chamber for injection molding decorative items is formed between the upper and lower flow channels. The first cooling pipe is disposed in the core insert, and the second cooling pipe is disposed in the cavity insert. The first cooling pipe and the second cooling pipe are used to introduce cooling medium. Thermocouples are respectively provided in the core insert and the cavity insert, and the thermocouples are used to sense the temperature of the decorative item inside the molding cavity.

2. The quick-cool plastic ornament forming mold according to claim 1, wherein It also includes a slanted core-pulling mechanism, which is located at the side end of the molding chamber; The inclined core-pulling mechanism includes an inclined guide post, a movable seat, a core-pulling insert, and a pressure plate. The lower template has core-pulling grooves on both sides, and the movable seat is located in the core-pulling grooves. One end of the core-pulling insert is connected to the side wall of the movable seat, and the other end of the core-pulling insert extends into the molding chamber. The core-pulling insert is used to mold the inner hole shape of the injection-molded decorative item. The movable seat is provided with an inclined hole, the inclined guide post is located in the inclined hole, and the top of the inclined guide post is connected to the upper template. The inclined guide post is used to push the movable seat to reciprocate in the core-pulling groove as the upper template moves.

3. The quick-cooling plastic ornament forming mold according to claim 1, characterized by, Both the core insert and the cavity insert are made of beryllium copper.

4. The quick-cooling plastic ornament forming mold according to claim 2, characterized by, It also includes a wear-resistant plate, which is disposed on the core-pulling groove.

5. The quick-cooling plastic trinket forming mold of claim 1, wherein, The first cooling pipe and the second cooling pipe are arranged in a rectangular structure.

6. The quick-cooling plastic trinket forming mold of claim 1, wherein, It also includes a flow rate control system, with the first cooling pipe and the second cooling pipe respectively connected to the flow rate control system. The flow rate control system is used to adjust the flow rate of the cooling medium in the first cooling pipe and the second cooling pipe based on the temperature detected by the thermocouple.

Images