An injection molding die and its temperature-controlled injection molding method

Abstract

This application relates to an injection molding die and its temperature-controlled injection method, belonging to the field of flat injection mold technology. It includes a top plate and a fixed mold cavity plate. The top plate has a primary pipeline, while the fixed mold cavity plate has secondary and tertiary pipelines, which are independent of each other. The top plate has a first multi-pin connector that acts on the primary pipeline, used to connect an external temperature control device to keep the top plate at a low temperature, reducing melt drooling, stringing, and overflow. A second multi-pin connector is provided between the top plate and the fixed mold cavity plate, with its two ends connected to the top plate and the fixed mold cavity plate respectively, used to connect an external temperature control device that acts on the secondary pipeline. The temperature of the top plate is collected in real time to provide feedforward heating to the secondary pipeline, reducing the shear freezing rate and weld lines during the filling stage, and enabling rapid cooling and shaping after injection. The tertiary pipeline continuously flows with a constant-temperature cooling medium to stabilize the cooling rate and shrinkage rate, reducing warpage.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and in particular to an injection molding mold and a temperature-controlled injection molding method thereof. Background Technology

[0002] Injection molding dies are the most widely used equipment in the plastics processing industry, and are widely used in many fields such as electronics, automobiles, daily necessities, and medical devices. They are the equipment for realizing the large-scale and standardized production of plastic products.

[0003] In related technologies, injection molding molds mainly consist of a fixed mold part and a moving mold part. The fixed mold part includes an upper mold plate, a female mold plate, and a female mold core fixedly installed in the female mold plate. The upper mold plate is fixedly connected to the female mold plate. The moving mold part includes a male mold plate and a male mold core fixedly installed in the male mold plate. During the injection molding process, the female mold core and the male mold core close the mold. The melt usually flows directly into the female mold core of the female mold plate through the upper mold plate, and then fills the cavity formed by the closing of the female mold core and the male mold core. After injection molding is completed, the injection molded part is cooled and formed.

[0004] Since molten plastic releases a lot of heat after being injected into the mold cavity, if the heat cannot be dissipated in time, it will lead to slow cooling and uneven cooling of the injection molded parts, which in turn will cause problems such as warping, shrinkage cavities, and surface defects. In order to enable the injection molded parts to cool and solidify quickly and evenly within a specified time and ensure the quality of the injection molded parts, cooling pipes are usually machined inside the female mold plate and the male mold plate. The cooling pipes control the mold temperature by circulating a cooling medium at a set temperature.

[0005] However, due to the high temperature and fluidity of molten plastic, when the melt flows directly into the mold core of the mold through the upper mold plate, defects such as melt drooling, stringing, and overflow are likely to occur. Among them, melt drooling will cause excess liquid residue at the cavity inlet, stringing will form irregular thread-like marks on the surface of the injection molded part, and overflow will cause burrs and flash on the edge of the injection molded part, affecting the appearance quality of the injection molded part. Summary of the Invention

[0006] To address the aforementioned problems, this application provides an injection molding die and a temperature-controlled injection molding method thereof.

[0007] This application provides an injection molding die with the following technical solution: it includes a top plate and a fixed mold cavity plate. The top plate has a primary pipeline inside, and the fixed mold cavity plate has a secondary pipeline and a tertiary pipeline inside. The top plate has a first multi-pin connector that acts on the primary pipeline. A second multi-pin connector is provided between the top plate and the fixed mold cavity plate. The two ends of the second multi-pin connector are respectively connected to the top plate and the fixed mold cavity plate. The first multi-pin connector and the second multi-pin connector are used to connect to an external temperature control device. The second multi-pin connector acts on the secondary pipeline. The primary pipeline, the secondary pipeline, and the tertiary pipeline are independent of each other.

[0008] By adopting the above technical solution, the primary pipeline is set inside the top plate and connected separately to a first multi-pin connector, which is used to connect an external temperature control device. At the same time, the secondary and tertiary pipelines are set inside the fixed mold cavity plate and connected to the external temperature control device through a second multi-pin connector set between the top plate and the fixed mold cavity plate. The primary, secondary and tertiary pipelines are independent of each other. The two ends of the second multi-pin connector automatically conduct the internal circuits of the top plate and the fixed mold cavity plate, respectively, realizing layered temperature control between the top plate area and the fixed mold cavity plate area, shortening the mold temperature stabilization time and improving production efficiency.

[0009] The first multi-pin connector operates on the primary pipeline, adjusting the temperature-regulating medium to a low-temperature state. This primary pipeline maintains the low temperature of the top plate, reducing melt drooling, stringing, and overflow defects caused by excessive temperature, and ensuring the stability of melt delivery. The second multi-pin connector connects to the top plate and the fixed mold cavity plate respectively, and operates on the secondary pipeline. It can collect the temperature of the top plate in real time and use this as a control benchmark to perform feedforward adjustment of the temperature in the secondary pipeline. This is used to heat the corresponding area of ​​the fixed mold cavity plate during the injection filling stage, reducing the temperature fluctuation of the molten plastic fluid. Shear freezing rate reduces weld lines and improves the melt's ability to replicate microstructures. After injection molding, the temperature of the temperature-regulating medium is lowered to achieve rapid cooling and shaping. The three-stage pipeline continuously supplies a stable-temperature cooling medium throughout the entire process from mold closing to mold parting. This ensures a constant low-temperature environment, thereby stabilizing the cooling rate and shrinkage of the injection molded parts and reducing warping, deformation, and dimensional deviations caused by temperature fluctuations. The constant temperature condition helps the melt maintain sufficient fluidity at the end of filling, improving the appearance quality and dimensional accuracy of the injection molded parts.

[0010] Preferably, a flow divider is provided between the top plate and the fixed mold cavity plate, the top plate is connected to the flow divider, the flow divider is connected to the fixed mold cavity plate, the top plate is provided with a first flow channel, the flow divider is provided with a flow divider channel, the flow divider channel is provided with a plurality of discharge ports, the fixed mold cavity plate is provided with a cavity and a plurality of flow chambers, the plurality of flow chambers correspond one-to-one with the plurality of discharge ports and are connected, the plurality of flow chambers are all connected to the cavity, and the first flow channel is connected to the flow divider channel.

[0011] By adopting the above technical solution, the molten plastic fluid is cooled by the primary pipeline when flowing through the first flow channel, forming a stable material flow with surface micro-condensation. After entering the flow channel in the manifold, it is evenly distributed to several outlets, and then enters each flow cavity through a one-to-one connection. In each flow cavity, pressure release and velocity reshaping are completed, and then multiple flow cavities synchronously and smoothly feed material into the mold cavity, ensuring that the melt can smoothly fill the mold cavity in a laminar flow state. The one-to-one connection between the flow cavity and the outlet reduces the probability of cross-interference and turbulence between different branches of melt in the flow channel, ensuring the consistency of pressure and flow rate of each branch of material flow. Multiple flow cavities are interconnected with the mold cavity, realizing multi-point synchronous feeding, which can improve the problems of uneven filling pressure, flow rate gradient and weld lines caused by single flow channel feeding, and improve the surface quality and dimensional accuracy consistency of the plastic parts.

[0012] Preferably, the fixed mold cavity plate includes a female mold plate and a male mold plate. The flow divider plate is disposed between the top plate and the female mold plate and is connected to the female mold plate. The female mold plate has a female mold core inside and the secondary pipeline is disposed inside the female mold core. The male mold plate has a male mold core inside and the tertiary pipeline is disposed inside the male mold core. When the fixed mold cavity plate is closed, the female mold plate and the male mold plate are closed, and the female mold core and the male mold core are connected to form the cavity and the flow cavity. When the fixed mold cavity plate is opened, the female mold plate and the male mold plate are separated. The two ends of the second multi-pin connector are fixedly connected to the side walls of the top plate and the female mold plate, respectively.

[0013] By adopting the above technical solution, the secondary pipeline is set inside the female mold core, and the two ends of the second multi-pin connector are fixedly connected to the top plate and the side wall of the female mold core, respectively. During the injection filling stage, the secondary pipeline is independently heated through the second multi-pin connector, which rapidly increases the temperature of the female mold core and the female mold core, further increasing the temperature of the secondary pipeline. This increases the temperature of the medium inside the secondary pipeline, thereby reducing the shear freezing rate of the molten plastic fluid, effectively reducing weld lines, and improving the melt's ability to replicate microstructures. On the other hand, the tertiary pipeline inside the male mold core continuously supplies cooling medium, which can keep the male mold side at a constant low temperature, thereby stabilizing the cooling rate and shrinkage rate of the injection molded part on the surface of the male mold core, and reducing warping, deformation, and dimensional deviations caused by temperature fluctuations.

[0014] Meanwhile, the second multi-pin connector can collect the temperature signal of the top plate in real time and use it as a control reference to adjust the temperature of the mother plate, so that the top plate always maintains a low temperature, thereby reducing defects such as melt drooling, stringing and overflow caused by excessive temperature, and ensuring the stability of melt delivery. The mother plate is rapidly heated during the filling stage and quickly reduces the temperature of the temperature regulating medium after pressure holding.

[0015] Preferably, it also includes an ejector plate, and a plurality of ejector holes are provided on the portions of the plurality of flow cavities and the plurality of cavities located on the male mold plate. A plurality of ejector pins are provided on the upper surface of the ejector plate. One end of the ejector pin is fixedly connected to the ejector plate. The ejector plate slides along the direction of mold closing and mold opening of the female mold plate and the male mold plate. The ejector pin is inserted into the ejector hole and slides in the ejector hole.

[0016] By adopting the above technical solution, the injection molding mold drives the ejector plate to slide. Several ejector pins are fixedly set on the upper surface of the ejector plate. Several ejector pin holes are set in both the flow cavity and the mold cavity. All ejector pins are inserted and slidably engaged with the corresponding ejector pin holes, so that the ejector pins can extend along the ejector pin holes. When the ejector plate pushes the ejector pins to move, the molded injection part can be ejected from the mold cavity at the same time, and the residual gate solidified material in the flow cavity can be ejected at the same time, so as to realize the rapid demolding and separation of the injection part from the mold cavity and the gate solidified material from the flow cavity.

[0017] Preferably, it further includes a male mold base plate and a spring. The ejector plate is disposed below the male mold base plate. The ejector plate is also provided with a plurality of columns. The columns are fixedly connected to the ejector plate. The columns and the ejector pins are slidably connected to the male mold base plate. The spring is sleeved on the columns. The lower end of the spring abuts against the male mold base plate, and the upper end of the spring abuts against the male mold plate.

[0018] By adopting the above technical solution, during the sliding process of the ejector plate, the male mold base plate is pushed to slide. The spring sleeved on the column is compressed and accumulates elastic potential energy because its lower end abuts against the male mold base plate. After the injection molded part is taken out and the ejection force is removed, the compression and rebound force of the spring pushes the ejector plate and the male mold base plate to return to their original position downwards.

[0019] Preferably, the first multi-pin connector is a 16-pin connector and the second multi-pin connector is a 24-pin connector.

[0020] By adopting the above technical solution, the first multi-pin connector is limited to a 16-pin connector. At the same time, the first multi-pin connector is used to connect the primary pipeline. The second multi-pin connector is limited to a 24-pin connector, and the two ends of the second multi-pin connector are connected to the top plate and the mother template respectively. This achieves a precise match between the pin resources of the temperature control circuit on the fixed mold side and the actual electrical load requirements of each area. The primary pipeline is set inside the top plate and is used to maintain the low temperature state of the top plate. The 16-pin connector has fully met the electrical channel requirements of the entire area. The 24-pin connector is connected between the top plate and the mother template. The secondary pipeline needs to synchronously control the high current power supply circuit of multiple heating zones of the shunt plate and the corresponding multi-point thermocouple temperature feedback circuit. At the same time, it also needs to collect the low temperature reference signal on the top plate side for feedforward compensation adjustment of the heating power of the mother template. The number of 24 pins can be allocated as follows: 12 pins for heater power output and 8 pins for thermocouple signal input.

[0021] This application provides a temperature-controlled injection molding method for injection molds, comprising the following steps: S1: The top plate, the flow divider plate, the female template and the male template are joined together; S2: Temperature is regulated by an external temperature control device connected to the first multi-pin connector to keep the top plate at a low temperature. S3: The secondary pipeline is supplied with a temperature regulating medium, the tertiary pipeline is supplied with a temperature-stable cooling medium, and the temperature control device connected to the second multi-pin connector adjusts the temperature of the female mold core according to the temperature of the primary pipeline. S4: Molten plastic flows into the distribution channel of the distribution plate through the first flow channel, and then into the flow cavity through several outlets, and is subsequently injected into the mold cavity to complete the filling; S5: The temperature control device connected to the second multi-pin connector lowers the temperature of the temperature regulating medium in the secondary pipeline to rapidly cool and shape the female mold core. At the same time, the tertiary pipeline in the male mold core continuously supplies a cooling medium with a stable temperature. S6: After the injection molded part has completely cooled, the top plate, the manifold plate, the female mold plate and the male mold plate separate the mold. When the ejector plate ejects the molded injection molded part, the upper end of the spring abuts against the male mold plate and the lower end of the spring abuts against the male mold base plate. The spring is compressed to generate elastic deformation and is reset through elastic deformation.

[0022] By adopting the above technical solution, a temperature-regulating medium is continuously supplied to the primary pipeline via the first multi-pin connector in S2, keeping the top plate at a low temperature. This effectively reduces melt drooling, stringing, and overflow defects, ensuring the stability of melt delivery. Simultaneously, in S3, a temperature control device connected to the second multi-pin connector regulates the temperature of the mold core based on the temperature of the primary pipeline. Combined with the supply of a temperature-regulating medium in the secondary pipeline and a cooling medium in the tertiary pipeline, the mold core obtains suitable temperature control conditions during the filling stage, reducing the shear-freezing rate of the molten plastic, minimizing weld lines, and improving the melt's affinity for microstructures. Copy capability; In S5, during the cooling process of the injection molded part, the temperature of the temperature regulating medium in the secondary pipeline is further reduced to rapidly cool and solidify the female mold core, while the tertiary pipeline in the male mold core continuously flows with a stable cooling medium, which can always maintain a constant low temperature environment, thereby stabilizing the cooling rate and shrinkage rate of the injection molded part, reducing warping, deformation and dimensional deviation caused by temperature fluctuations. The constant temperature condition helps the melt maintain sufficient fluidity at the end of filling, improving the appearance quality and dimensional accuracy of the injection molded part. Finally, in S6, the smooth ejection and automatic reset are achieved through the cooperation of the ejector plate and spring.

[0023] Preferably, in step S2, the temperature of the temperature-regulating medium in the primary pipeline is controlled to 20-40°C by a temperature control device connected to the first multi-pin connector.

[0024] By adopting the above technical solution, the temperature of the temperature-regulating medium in the primary pipeline is controlled within the range of 20-40℃, which ensures that the top plate maintains a stable low temperature. This effectively reduces defects such as drooling, stringing, and overflow caused by excessively high temperatures when the molten plastic flows through the first runner, ensuring the stability and continuity of melt delivery. Simultaneously, this low-temperature environment helps the melt form a stable, micro-condensed flow on the surface within the first runner, improving the appearance quality and molding consistency of the injection molded parts.

[0025] Preferably, in step S3, the temperature control device connected to the second multi-pin connector uses the actual temperature of the primary pipeline collected as a feedforward reference to dynamically adjust the heating power of the female mold core. The temperature of the secondary pipeline of the female mold core is controlled by the temperature control device connected to the second multi-pin connector to be 1.2-1.5 times the conventional mold temperature of the selected plastic material.

[0026] By adopting the above technical solution, the temperature of the secondary pipeline of the mold core is controlled at 1.2-1.5 times the conventional mold temperature of the selected plastic material. This can compensate for the interference of temperature fluctuations of the top plate on the stability of melt delivery in real time, so that the mold core can obtain a suitable preheating temperature during the injection filling stage. This significantly reduces the shear freezing rate of the molten plastic fluid, effectively reduces weld lines, and greatly improves the melt's ability to copy microstructures. At the same time, this feedforward adjustment mechanism can reduce the overheating or underheating of the mold core caused by abnormal temperature of the primary pipeline, ensuring that the mold core is always in an ideal state of rapid heating. Thus, while ensuring smooth melt filling, a high-gloss and high-precision injection molded part appearance can be obtained.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The first multi-pin connector is used on the primary pipeline to adjust the temperature regulating medium to a low temperature state. The primary pipeline is used to maintain the low temperature state of the top plate, reduce defects such as melt drooling, stringing and overflow caused by excessive temperature, and ensure the stability of melt delivery. 2. The two ends of the second multi-pin connector are connected to the top plate and the fixed mold cavity plate respectively. The second multi-pin connector acts on the secondary pipeline and can collect the temperature of the top plate in real time. Using this as the control reference, the temperature of the secondary pipeline is fed forward and adjusted. This is used to heat the corresponding area of ​​the fixed mold cavity plate during the injection filling stage, reduce the shear freezing rate of the molten plastic fluid, reduce weld lines and improve the melt's ability to copy microstructures. After injection, the temperature of the temperature regulating medium is lowered to achieve rapid cooling and shaping. 3. The three-stage pipeline is used to continuously supply a cooling medium with a stable temperature throughout the entire process from mold closing to mold parting. The three-stage pipeline can maintain a constant low temperature environment throughout the entire process from mold closing to mold parting, thereby stabilizing the cooling rate and shrinkage rate of the injection molded parts, reducing warping, deformation and dimensional deviation caused by temperature fluctuations. The constant temperature condition helps the melt maintain sufficient fluidity at the end of filling, improving the appearance quality and dimensional accuracy of the injection molded parts. 4. By setting the primary pipeline inside the top plate and connecting it separately to a first multi-pin connector, which is used to connect an external temperature control device, while setting the secondary and tertiary pipelines inside the fixed mold cavity plate and connecting them to the external temperature control device via a second multi-pin connector located between the top plate and the fixed mold cavity plate, the primary, secondary, and tertiary pipelines are independent of each other. The two ends of the second multi-pin connector automatically connect the internal circuits of the top plate and the fixed mold cavity plate, respectively, realizing layered temperature control between the top plate area and the fixed mold cavity plate area, shortening the mold temperature stabilization time and improving production efficiency. Attached Figure Description

[0028] Figure 1This is a structural schematic diagram of an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the structure of the top plate, the fixed mold cavity plate, the second multi-pin connector, the first multi-pin connector, and the diverter plate in the embodiments of this application.

[0030] Figure 3 This is a schematic diagram of the internal structure of the top plate, the fixed mold cavity plate, the second multi-pin connector, the first multi-pin connector, and the diverter plate in the embodiments of this application.

[0031] Figure 4 This is a schematic diagram of the top plate, the runner, and the male mold core in the embodiments of this application.

[0032] Figure 5 This is a schematic diagram of the top plate, the flow channel, and the male mold core in the embodiments of this application.

[0033] Figure 6 This is a schematic diagram of the internal structure of the fixing plate, the fixed mold cavity plate, the second multi-pin connector, the first multi-pin connector, and the flow divider plate in the embodiments of this application, as well as a schematic diagram of the structure of the male mold base plate and the ejector plate.

[0034] Figure 7 This is a schematic diagram of the male mold core and ejector pin in the embodiments of this application.

[0035] Figure 8 This is a schematic diagram of the male mold core and ejector pin in the embodiments of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Top plate; 11. Primary pipeline; 12. First flow channel; 2. Fixed mold cavity plate; 21. Female mold plate; 211. Female mold core; 2111. Secondary pipeline; 22. Male mold plate; 221. Male mold core; 2211. Tertiary pipeline; 3. Second multi-pin connector; 4. First multi-pin connector; 5. Diverter plate; 51. Diverter channel; 511. Outlet; 6. Male mold base plate; 7. Ejector plate; 71. Column; 72. Ejector pin; 73. Spring; 8. Cavity; 9. Flow cavity; 10. Ejector pin hole. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0038] This application discloses an injection molding die and its temperature-controlled injection molding method, applied to the injection molding of light guide strips. A light guide strip is an optical transmission element that requires only a single light source to uniformly transmit light along its entire length through internal refraction and total internal reflection, achieving continuous light emission. It is used in automotive interior ambient lighting, consumer electronics backlighting, and smart home appliance indicators. Light guide strips have extremely high requirements for surface finish, dimensional accuracy, and microstructure replication capability during injection molding. Traditional injection molds use uniform cooling and temperature control, which easily leads to defects such as drooling, stringing, obvious weld lines, and warping deformation in the light guide strips, significantly affecting optical transmission performance and product yield. Example

[0039] Embodiment 1 of this application discloses an injection molding die, referring to... Figure 1 It includes a top plate 1 and a fixed mold cavity plate 2. The top plate 1 has a primary pipeline 11 inside, which is used to flow the temperature regulating medium. The fixed mold cavity plate 2 has a secondary pipeline 2111 and a tertiary pipeline 2211 inside. The secondary pipeline 2111 is used to flow the temperature regulating medium, and the tertiary pipeline 2211 is used to flow the cooling medium. The primary pipeline 11, the secondary pipeline 2111 and the tertiary pipeline 2211 are physically independent of each other.

[0040] Reference Figure 2 Specifically, a first multi-pin connector 4 is fixedly installed on the top plate 1. The first multi-pin connector 4 acts on the internal flow channel of the primary pipeline 11 and is used to establish a connection with an external temperature control device. The temperature control device is used to continuously supply a temperature-regulating medium that has been adjusted to a specific low temperature state into the primary pipeline 11, so that the top plate 1 maintains a stable low temperature environment throughout the entire injection molding cycle. This low temperature environment can effectively reduce drooling, stringing, and overflow defects caused by excessively high local temperatures when the molten plastic flows through the area of ​​the top plate 1, ensuring the continuity and stability of melt delivery.

[0041] Reference Figure 2 Furthermore, a second multi-pin connector 3 is provided between the top plate 1 and the fixed mold cavity plate 2. The second multi-pin connector 3 is a cross-plate electrical docking component. One end of the second multi-pin connector 3 is fixedly connected to the side wall of the top plate 1, and the other end of the second multi-pin connector 3 is fixedly connected to the side wall of the fixed mold cavity plate 2. The two ends of the second multi-pin connector 3 automatically plug in and conduct, realizing the electrical circuit connection between the top plate 1 and the fixed mold cavity plate 2. The second multi-pin connector 3 is also used for connecting an external temperature control device, and the second multi-pin connector 3 acts on the secondary pipeline 2111 inside the fixed mold cavity plate 2.

[0042] Furthermore, the first multi-pin connector 4 is configured as a sixteen-pin connector. Since the primary pipeline 11 only needs to maintain the low temperature state of the top plate 1, the number of electrical channels to be controlled is relatively limited. The sixteen-pin pin configuration fully meets all the electrical connection requirements of this area. The specific pin allocation method is as follows: eight pins are used for the power output of the temperature control device, and the other eight pins are used for the signal input of the temperature sensor. The second multi-pin connector 3 is preferably a twenty-four-pin connector. The fixed mold cavity plate 2 includes a mother mold plate 21. The mother mold plate 21 has a mother mold core 211 inside. The secondary pipeline 2111 is located inside the mother mold core 211. In the actual temperature control process, the low temperature reference signal on the side of the top plate 1 needs to be collected as the basis for the feedforward compensation adjustment of the heating power of the mother mold plate 21. Therefore, the pin number allocation of the twenty-four-pin connector is usually as follows: twelve pins are used for the power output of the temperature control device, eight pins are used for the thermocouple signal input, and the remaining four pins are used for control signal transmission and spare.

[0043] Reference Figure 1 Furthermore, a flow divider 5 is provided between the top plate 1 and the fixed mold cavity plate 2. The flow divider 5 is located between the top plate 1 and the mother mold plate 21. A first flow channel 12 extending along the thickness direction is opened in the top plate 1. The inlet end of the first flow channel 12 is used to connect with the nozzle of the injection molding machine. (Refer to...) Figure 2 and Figure 3 The flow divider 5 has a flow divider channel 51 inside. The inlet of the flow divider channel 51 is connected to the outlet of the first flow channel 12. The flow divider channel 51 extends along the inside of the flow divider 5 and forms a flow divider structure. The flow divider channel 51 is provided with a number of evenly distributed discharge ports 511. In this embodiment, there are three discharge ports 511. The mold cavity plate 2 is provided with a cavity 8 and a flow cavity 9. The flow cavity 9 is also provided with three, which correspond one-to-one with the three discharge ports 511 and are connected. The flow cavities 9 are all connected to the cavity 8.

[0044] Reference Figure 2 and Figure 3 Furthermore, the mold cavity plate 2 specifically includes a male mold plate 22, inside which a male mold core 221 is provided. The male mold core 221 has internally machined three-stage pipes 2211 for the flow of cooling medium, as shown in the reference. Figure 4 and Figure 5 When the mold is closed, the female mold plate 21 and the male mold plate 22 are tightly closed. The female mold core 211 and the male mold core 221 are connected and then form the cavity 8 and the flow cavity 9. When the mold is opened, the female mold plate 21 and the male mold plate 22 are separated along the mold opening direction. The injection molded part is left on one side of the male mold core 221 for subsequent ejection. The two ends of the second multi-pin connector 3 are fixedly connected to the side wall of the top plate 1 and the side wall of the female mold plate 21, respectively.

[0045] Reference Figure 6In addition, the injection molding mold also includes a male mold base plate 6 and an ejector plate 7. The male mold base plate 6 is located on the side of the male mold plate 22 opposite to the female mold plate 21. The ejector plate 7 is located below the male mold base plate 6 and slides along the mold opening and closing direction. Several vertically extending columns 71 and several vertically extending ejector pins 72 are fixedly provided on the upper surface of the ejector plate 7. The male mold base plate 6 slides with the columns 71 and ejector pins 72. Each column 71 is fitted with a spring 73. The lower end of the spring 73 abuts against the upper surface of the male mold base plate 6, and the upper end of the spring 73 abuts against the lower surface of the male mold plate 22. (Refer to...) Figure 7 and Figure 8 Each cavity 8 and each flow cavity 9 located in the part of the template 22 are provided with a number of ejector pin holes 10. Each flow cavity 9 is provided with two ejector pin holes 10. Each cavity 8 is provided with two ejector pin holes 10. The number and position of ejector pins 72 correspond one-to-one with the ejector pin holes 10. The upper end of the ejector pin 72 is inserted into the ejector pin hole 10.

[0046] The implementation principle of an injection molding die in Embodiment 1 of this application is as follows: During the injection molding process, after the molten plastic fluid enters from the first flow channel 12, it is continuously cooled by the low temperature regulating medium in the primary pipeline 11, forming a stable material flow with surface micro-condensation near the inner wall of the first flow channel 12. Subsequently, it enters the flow channel 51 in the flow divider plate 5 and is evenly distributed to the three outlets 511. After the melt flows out from the outlets 511, it first flows into the flow cavity 9 for pressure release and flow rate realignment. Finally, it is smoothly injected into the cavity 8 in a laminar flow state from the flow cavity 9, thereby completing the filling process of the cavity 8.

[0047] After the injection molded part cools and solidifies, the injection molding machine drives the ejector plate 7 to move closer to the male mold plate 22. The ejector pin 72 extends along the ejector hole 10, thereby ejecting the molded part from the cavity 8 and the residual sprue material in the flow cavity 9 from the flow cavity 9. During the ejection process, the spring 73 abuts against the male mold base plate 6. The spring 73 is compressed and accumulates elastic potential energy. When the ejection force is removed, the compression and rebound force of the spring 73 drives the ejector plate 7 and the male mold base plate 6 to automatically return to the initial position.

[0048] By setting the primary pipeline 11 inside the top plate 1 and connecting it separately to the first multi-pin connector 4 to access the temperature control device, and setting the secondary pipeline 2111 and the tertiary pipeline 2211 inside the fixed mold cavity plate 2, and connecting them to the temperature control device through the second multi-pin connector 3 located between the top plate 1 and the mother mold plate 21, the primary pipeline 11, the secondary pipeline 2111 and the tertiary pipeline 2211 are independent of each other, achieving precise temperature control of the layered temperature variation between the top plate 1 area and the fixed mold cavity plate 2 area. Example

[0049] This embodiment 2 discloses a temperature-controlled injection molding method for injection molding molds. The method is based on the injection molding mold described in embodiment 1 and specifically includes the following steps: The first step is to stack and lock the top plate 1, the flow divider 5, the female mold plate 21 and the male mold plate 22 together, and connect the female mold core 211 and the male mold core 221 to form the cavity 8 and the flow cavity 9.

[0050] The second step involves continuously supplying a prepared temperature-regulating medium into the primary pipeline 11 through the first multi-pin connector 4, and regulating the temperature of the medium within the range of 20 to 40 degrees Celsius through an external temperature control device connected to the first multi-pin connector 4. For example, for injection molding of polycarbonate materials, the temperature of the temperature-regulating medium in the primary pipeline 11 can be stably maintained at 25 degrees Celsius; for injection molding of polypropylene materials, the temperature of the temperature-regulating medium can be stably maintained at 30 degrees Celsius, so that the top plate 1 maintains a constant low temperature state throughout the entire injection molding cycle.

[0051] The third step involves introducing a temperature-regulating medium into the secondary pipeline 2111 and a cooling medium with a stable temperature, such as cooling water at a constant temperature of 20 degrees Celsius, into the tertiary pipeline 2211. The second multi-pin connector 3 collects the actual temperature value of the top plate 1 in real time through an external temperature control device and uses this actual temperature value as a feedforward reference. The heating power of the female mold core 211 is dynamically adjusted through the external temperature control device of the second multi-pin connector 3. The specific adjustment target is to control the temperature of the secondary pipeline 2111 in the female mold core 211 within the range of 1.2 to 1.5 times the conventional mold temperature of the selected plastic material. For example, for polycarbonate materials with a conventional mold temperature set at 80 degrees Celsius, the temperature control device connected to the second multi-pin connector 3 uses the actual temperature of the primary pipeline 11 as a reference to adjust the temperature of the secondary pipeline 2111 to 100 to 120 degrees Celsius. For polypropylene materials with a conventional mold temperature set at 50 degrees Celsius, the temperature of the secondary pipeline 2111 is adjusted to 60 to 75 degrees Celsius. This reduces the shear freezing rate of the molten plastic fluid during the filling process, which helps to reduce weld lines and improve the melt's ability to replicate microstructures.

[0052] In the fourth step, the molten plastic is injected into the first flow channel 12 through the injection molding machine nozzle. In the first flow channel 12, it is continuously cooled by the primary pipeline 11 to form a stable material flow with micro-condensation on the surface. Then it flows into the flow channel 51 of the flow divider plate 5. After being evenly distributed by the flow channel 51, the melt flows into the flow chamber 9 from several outlets 511. After pressure release and speed reorganization are completed in the flow chamber 9, the melt is smoothly injected into the cavity 8 in a laminar flow state until the cavity 8 is completely filled.

[0053] Fifth, the external temperature control device of the second multi-pin connector 3 rapidly lowers the temperature of the temperature regulating medium in the secondary pipeline 2111, for example, rapidly reducing the temperature of the temperature regulating medium from 100 degrees Celsius to 30 degrees Celsius, thereby rapidly cooling and shaping the female mold core 211. At the same time, the tertiary pipeline 2211 in the male mold core 221 continuously supplies a cooling medium with a stable temperature, so that the male mold core 221 always maintains a constant low temperature environment. This reduces the cooling rate and shrinkage rate of the injection molded part on the male mold core 221 side, thereby reducing warping, deformation and dimensional deviation caused by temperature fluctuations.

[0054] Step 6: After the injection molded part has completely cooled, the top plate 1, the manifold 5, the female mold plate 21 and the male mold plate 22 are separated. The female mold plate 21 and the male mold plate 22 are separated, and the injection molded part remains on the male mold core 221. Then, the injection molding machine drives the ejector plate 7 to move closer to the male mold plate 22. The ejector pin 72 extends along the ejector pin hole 10 and ejects the injection molded part from the cavity 8. The remaining sprue solidified material in the flow cavity 9 is ejected from the flow cavity 9 simultaneously. During the ejection process, the male mold base plate 6 abuts against the spring 73, and the spring 73 is compressed. After the injection molded part is removed, the ejection force is removed, and the elastic restoring force of the spring 73 drives the ejector plate 7 and the male mold base plate 6 to automatically reset.

[0055] The implementation principle of the temperature-controlled injection molding method for an injection mold in Embodiment 2 of this application is as follows: In the second step, a temperature-regulating medium is continuously supplied to the primary pipeline 11 through the external temperature control device connected to the first multi-pin connector 4, keeping the top plate 1 at a low temperature. This effectively reduces melt drooling, stringing, and overflow defects, ensuring the stability of melt delivery. In the third step, the temperature control device connected to the second multi-pin connector 3 uses the actual temperature of the primary pipeline 11 as a feedforward reference to dynamically regulate the temperature of the mold core 211, ensuring that the mold core 211 obtains a suitable temperature during the filling stage. The preheating conditions reduce the shear freezing rate of the molten plastic, decrease weld lines, and improve the melt's ability to replicate microstructures. In the fifth step, during the injection molding part cooling stage, the temperature of the temperature regulating medium in the secondary pipeline 2111 is further reduced to rapidly cool and solidify the female mold core 211. Meanwhile, the tertiary pipeline 2211 in the male mold core 221 continuously supplies a cooling medium with a stable temperature, maintaining a constant low-temperature environment. This stabilizes the cooling rate and shrinkage rate of the plastic part, reducing warping, deformation, and dimensional deviations caused by temperature fluctuations.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection molding die, characterized in that: The system includes a top plate (1) and a fixed mold cavity plate (2). The top plate (1) has a primary pipeline (11) inside, and the fixed mold cavity plate (2) has a secondary pipeline (2111) and a tertiary pipeline (2211) inside. The top plate (1) has a first multi-pin connector (4) which acts on the primary pipeline (11). A second multi-pin connector (3) is provided between the top plate (1) and the fixed mold cavity plate (2). The two ends of the second multi-pin connector (3) are connected to the top plate (1) and the fixed mold cavity plate (2) respectively. The first multi-pin connector (4) and the second multi-pin connector (3) are used to connect to an external temperature control device. The second multi-pin connector (3) acts on the secondary pipeline (2111). The primary pipeline (11), the secondary pipeline (2111), and the tertiary pipeline (2211) are independent of each other.

2. The injection molding die according to claim 1, characterized in that: A flow divider plate (5) is provided between the top plate (1) and the fixed mold cavity plate (2). The top plate (1) is connected to the flow divider plate (5), and the flow divider plate (5) is connected to the fixed mold cavity plate (2). The top plate (1) is provided with a first flow channel (12), and the flow divider plate (5) is provided with a flow divider channel (51). The flow divider channel (51) is provided with a plurality of discharge ports (511). The fixed mold cavity plate (2) is provided with a cavity (8) and a plurality of flow chambers (9). The plurality of flow chambers (9) correspond one-to-one with the plurality of discharge ports (511) and are connected. The plurality of flow chambers (9) are all connected to the cavity (8). The first flow channel (12) is connected to the flow divider channel (51).

3. The injection molding die according to claim 2, characterized in that: The fixed mold cavity plate (2) includes a female mold plate (21) and a male mold plate (22). The flow divider plate (5) is disposed between the top plate (1) and the female mold plate (21). The flow divider plate (5) is connected to the female mold plate (21). The female mold plate (21) is provided with a female mold core (211). The female mold core (211) is provided with the secondary pipeline (2111). The male mold plate (22) is provided with a male mold core (221). The male mold core (221) is provided with the secondary pipeline (2111). The three-stage pipeline (2211) is as follows: when the fixed mold cavity plate (2) is closed, the female mold plate (21) and the male mold plate (22) are closed, and the female mold core (211) and the male mold core (221) are connected to form the cavity (8) and the flow cavity (9). When the fixed mold cavity plate (2) is opened, the female mold plate (21) and the male mold plate (22) are separated. The two ends of the second multi-pin connector (3) are fixedly connected to the top plate (1) and the side wall of the female mold plate (21) respectively.

4. The injection molding die according to claim 3, characterized in that: It also includes an ejector plate (7), and a plurality of ejector holes (10) are provided on the portions of the several flow cavities (9) and the several cavities (8) located on the male template (22). A plurality of ejector pins (72) are provided on the upper surface of the ejector plate (7). One end of the ejector pin (72) is fixedly connected to the ejector plate (7), and the ejector pin (72) is inserted into the ejector hole (10) and the ejector pin (72) slides in the ejector hole (10).

5. The injection molding die according to claim 4, characterized in that: It also includes a male mold base plate (6) and a spring (73). The ejector plate (7) is located below the male mold base plate (6). The ejector plate (7) is also provided with a plurality of columns (71). The columns (71) are fixedly connected to the ejector plate (7). The columns (71) and the ejector pins (72) are slidably connected to the male mold base plate (6). The spring (73) is sleeved on the columns (71). The lower end of the spring (73) abuts against the male mold base plate (6), and the upper end of the spring (73) abuts against the male mold template (22).

6. The injection molding die according to claim 1, characterized in that: The first multi-pin connector (4) is a 16-pin connector, and the second multi-pin connector (3) is a 24-pin connector.

7. A temperature-controlled injection molding method for an injection mold, characterized in that, Includes the following steps: S1: The top plate (1), the flow divider plate (5), the female template (21) and the male template (22) are joined together; S2: Temperature is regulated by a temperature control device connected to the first multi-pin connector (4) to keep the top plate (1) at a low temperature. S3: The secondary pipeline (2111) is supplied with a temperature regulating medium, and the tertiary pipeline (2211) is supplied with a temperature-stable cooling medium. The temperature control device connected to the second multi-pin connector (3) adjusts the temperature of the female mold core (211) according to the temperature of the primary pipeline (11). S4: Molten plastic flows into the branch channel (51) of the branch plate (5) through the first flow channel (12), and then flows into the flow cavity (9) through several outlets (511), and is then injected into the mold cavity (8) to complete the filling; S5: The temperature control device connected to the second multi-pin connector (3) lowers the temperature of the temperature regulating medium in the secondary pipeline (2111) to rapidly cool and shape the female mold core (211). At the same time, the tertiary pipeline (2211) in the male mold core (221) continuously supplies a cooling medium with a stable temperature. S6: After the injection molded part has completely cooled, the top plate (1), the flow divider plate (5), the female mold plate (21) and the male mold plate (22) are separated. When the ejector plate (7) ejects the molded injection molded part, the upper end of the spring (73) abuts against the male mold plate (22) and the lower end of the spring (73) abuts against the male mold base plate (6). The spring (73) is compressed to generate elastic deformation and is reset through elastic deformation.

8. The temperature-controlled injection molding method for injection molding molds according to claim 7, characterized in that: In step S2, the temperature of the temperature-regulating medium in the first-stage pipeline (11) is adjusted to 20-40℃ by the temperature control device connected to the first multi-pin connector (4).

9. The temperature-controlled injection molding method for injection molding molds according to claim 7, characterized in that: In step S3, the temperature control device connected to the second multi-pin connector (3) uses the actual temperature of the primary pipeline (11) as a feedforward reference to dynamically adjust the heating power of the female mold core (211). The temperature of the secondary pipeline (2111) of the female mold core (211) is controlled by the temperature control device connected to the second multi-pin connector (3) to be 1.2-1.5 times the conventional mold temperature of the selected plastic material.

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