Colorful rubbing strip injection mold and injection molding method

Abstract

The invention discloses a colorful rubbing strip injection mold which comprises a mold cavity defined by a front mold body and a rear mold body. The exhaust channel is arranged on the front mold and / or the rear mold and is communicated with the cavity; the hot runner assembly comprises a pouring runner, and the front mold is clamped between the rear mold and the hot runner assembly; the cooling assembly comprises a plurality of independent cooling pipelines which are embedded in the front mold and the rear mold; the demolding assembly is connected with the rear mold and is configured to eject the injection molding part out of the injection mold; the exhaust auxiliary mechanism comprises a fluid transmission device and a sensing device, the fluid transmission device is connected with one of the exhaust channels, and the sensing device is connected with the other exhaust channels; the injection molding part molding surface of the front mold is provided with textures; one end of the pouring runner is connected with the injection molding machine, and the other end is communicated with the cavity. The exhaust auxiliary mechanism is arranged on the injection mold, so that the cleanness in the cavity and the smoothness of the exhaust channel are ensured, and the injection molding quality and the injection molding efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to an anti-scratch strip injection mold and an injection molding method. Background Art

[0002] Injection molds are made by injecting molten plastic into a mold through the injection molding process, and then cooling and solidifying to obtain injection molded products. At present, injection molds are widely used in automobile dashboards, bumpers, door guards, anti-scratch strips, headlights and other interior and exterior decorations and structural parts.

[0003] In the prior art, injection molds are prone to the following problems: 1. The exhaust system is blocked, and trapped air causes insufficient or uneven filling in the cavity; 2. Insufficient surface treatment of the cavity easily causes bubbles to form in the injection molded parts, affecting the molding quality of the injection molded parts; 3. Cooling is too fast, the pouring gate cools and solidifies first, and the molten plastic cannot enter the cavity. Summary of the invention

[0004] One of the purposes of the present invention is to overcome the defects existing in the prior art and provide an anti-scratch strip injection mold to ensure smooth exhaust, sufficient filling, controllable cooling effect, reduce the generation of bubbles, and improve the injection quality.

[0005] In order to achieve the above technical effects, the technical solution of the present invention is: a colorful anti-scratch strip injection mold, comprising: The cavity is formed by the front mold and the back mold; An exhaust channel is provided in the front mold and / or the rear mold and communicated with the mold cavity; The hot runner assembly includes a pouring runner; the front mold is sandwiched between the rear mold and the hot runner assembly; A cooling assembly, comprising a plurality of independent cooling pipelines, embedded in the front mold and the rear mold; A demoulding assembly connected to the rear mold and configured to eject the injection molded part from the injection mold; An exhaust assist mechanism, comprising a fluid transmission device and a sensing device, wherein the fluid transmission device is connected to one of the exhaust passages, and the sensing device is connected to the remaining exhaust passages; The molding surface of the injection molded part of the front mold is provided with a texture; one end of the pouring runner is connected to the injection molding machine, and the other end is communicated with the mold cavity.

[0006] A preferred technical solution is that the molding surface of the injection molded part of the front mold is provided with a plurality of pouring gates, and the pouring gates are communicated with the pouring runners.

[0007] A preferred technical solution is that the cooling pipeline is a pipeline arranged circumferentially around the pouring port, and a plurality of the cooling pipelines are arranged at intervals.

[0008] A preferred technical solution is that the pouring port is provided with a fluid monitoring module configured to monitor the pressure and / or flow rate at the pouring port.

[0009] A preferred technical solution is that the fluid transmission device is a fan.

[0010] A preferred technical solution is that the fluid transmission device is a negative pressure device or a positive pressure device.

[0011] A preferred technical solution is that the sensing device is a thin sensing strip or a micro fan, which is arranged at the outlet of the exhaust passage.

[0012] A preferred technical solution is that a filtering device is provided in the fan.

[0013] One of the purposes of the present invention is to overcome the defects existing in the prior art and provide a method for injection molding of a colorful anti-scratch strip, the method for injection molding of the colorful anti-scratch strip injection mold described in the above technical solution comprises the following steps: Step 1: The front mold and the rear mold are molded together; Step 2: The exhaust auxiliary mechanism is connected to one of the exhaust channels, the fluid transmission device is started, the cavity is cleaned, and the changes of the sensing device are observed; Step 3: when it is observed that the sensing device is changed by the action of the fluid transmission device, the fluid transmission device is turned off; the injection molding machine, the hot runner assembly and the fluid monitoring module are started, and the molten plastic is injected into the cavity through the pouring runner; Step 4: After pouring is completed, the cooling component is started, and the plurality of cooling pipelines are gradually started in time periods from the outside to the center with the pouring port as the center; Step 5: Start the demoulding of the demoulding assembly.

[0014] The advantages and beneficial effects of the present invention are: The invention arranges an exhaust auxiliary mechanism on the injection mold, detects and cleans the cavity and the exhaust passage after mold closing, ensures the cleanliness of the cavity and the exhaust passage, reduces bubbles, and improves the injection quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 2 is a schematic diagram of the overall three-dimensional structure of the injection mold for the multi-colored anti-scratch strip in the embodiment; Figure 2 It is a schematic diagram of the three-dimensional structure of the injection molded part; Figure 3 2. It is a schematic diagram of the three-dimensional structure of a part of the injection mold of the multi-colored anti-scratch strip in the embodiment; Figure 4 yes Figure 3 Schematic diagram of the cross section of AA; Figure 5 3. It is a schematic diagram of the three-dimensional structure of the exhaust auxiliary mechanism in the injection mold of the multi-colored anti-scratch strip in the embodiment; Figure 6 yes Figure 5 The enlarged schematic diagram of point B in the middle; Figure 7 It is a three-dimensional structural schematic diagram of an exhaust auxiliary mechanism in an injection mold of a multi-colored anti-scratch strip in another embodiment; Figure 8 yes Figure 7 The enlarged schematic diagram of the center C; Fig. 9 3. It is a schematic diagram of the three-dimensional structure of the demoulding component in the injection mold of the colorful anti-scratch strip in the embodiment; Fig.10 1 is a schematic diagram of the three-dimensional structure of the hot runner assembly in the injection mold of the colorful anti-scratch strip in the embodiment; Fig.11 1 is a top view of the lower mold in the injection mold of the colorful anti-scratch strip in the embodiment; Fig.12 yes Fig.11 The enlarged schematic diagram of point D in the middle; Fig.13 Schematic diagram of the cooling pipeline structure in the injection mold of the colorful anti-scratch strip in the embodiment; In the figure: 1. cavity; 2. front mold; 201. molding surface of injection molded part; 2011. connection molding area; 2012. anti-scratch molding area; 202. pouring gate; 3. rear mold; 4. exhaust channel; 401. groove; 5. injection molded part; 501. door connection area; 502. anti-scratch area; 6. hot runner assembly; 601. pouring channel; 6011. main flow channel; 6012. branch flow channel; 7. cooling assembly; 701. cooling pipeline; 7011. first cooling pipeline; 7012. second cooling pipeline; 7013. third cooling pipeline; 8. demoulding assembly; 9. exhaust auxiliary mechanism; 901. fluid transmission device; 902. sensing device; 9021. thin sensing strip; 9022. micro fan; 10. fluid monitoring module; 11. filtering device. DETAILED DESCRIPTION

[0016] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0017] In the description of the present invention, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0019] like Figures 1 to 13 As shown in the embodiment, a multi-colored anti-scratch strip injection mold is characterized by comprising: The cavity 1 is formed by the front mold 2 and the rear mold 3; An exhaust channel 4 is provided in the front mold 2 and / or the rear mold 3 and communicated with the mold cavity 1; The hot runner assembly 6 includes a pouring runner 601, and the front mold 2 is sandwiched between the rear mold 3 and the hot runner assembly 6; The cooling assembly 7 includes a plurality of independent cooling pipes 701, which are embedded in the front mold 2 and the rear mold 3; A demoulding assembly 8 connected to the rear mold 3 and configured to eject the injection molded part 5 from the injection mold; The exhaust assisting mechanism 9 comprises a fluid transmission device 901 and a sensing device 902, wherein the fluid transmission device 901 is connected to one of the exhaust passages 4, and the sensing device 902 is connected to the remaining exhaust passages 4; The injection molding surface 201 of the front mold 2 is provided with a texture; one end of the pouring runner 601 is connected to the injection molding machine, and the other end is communicated with the mold cavity 1.

[0020] like Figures 5 to 8 As shown, by setting an exhaust auxiliary mechanism 9, the exhaust channel 4 after the front mold 2 and the rear mold 3 are closed is detected before injection molding to ensure the smooth flow of the exhaust channel 4, improve the quality of the injection molded part 5, and avoid insufficient filling in the cavity 1 due to trapped air.

[0021] In the prior art, the exhaust channel 4 is usually checked and cleaned manually after the front mold 2 and the rear mold 3 are separated. This detection method requires that the structure of the exhaust channel 4 is visible as a whole to facilitate cleaning. After the exhaust auxiliary mechanism 9 is provided, the position of the exhaust channel 4 is diversified, and can be provided in the front mold 2, or in the rear mold 3, or in both the front mold 2 and the rear mold 3.

[0022] like Fig.11 As shown, in the present embodiment, the exhaust channel 4 is arranged in a groove 401 of the front mold 2 or the rear mold 3, and the notch of the groove 401 is arranged on the abutting surface where the front mold 2 and the rear mold 3 abut against each other after the mold is closed, that is, after the front mold 2 and the rear mold 3 are closed, the groove 401 connects the inside and outside of the cavity 1; when the front mold 2 and the rear mold 3 are separated, the setting of the groove 401 makes it convenient to directly observe whether the exhaust channel 4 is blocked and to manually clean the exhaust channel 4.

[0023] The exhaust auxiliary mechanism 9 includes a fluid transmission device 901 and a sensing device 902. The fluid transmission device 901 transmits gas or liquid in the mold cavity 1 after mold closing by connecting any exhaust channel 4, and observes the state of the sensing device 902 set at other exhaust channels 4 to determine whether the exhaust in the mold cavity 1 is smooth.

[0024] Specifically, what is transmitted between the fluid transmission device 901 and the cavity 1 is gas, and the sensing device 902 can be a ribbon in a relaxed state, or a micro fan; the flow of gas drives the movement of the ribbon and the micro fan.

[0025] By providing a texture on the molding surface 201 of the front mold 2, the surface of the molded part 5 has an integrally molded texture, which increases the diversity of the molded part 5 and other visual effects, that is, the colorful effect mentioned in the name of this application.

[0026] In this embodiment, the demoulding component 8 is a push rod. During demoulding, the push rod abuts against the injection molded part 5 to separate the injection molded part 5 from the rear mold 3 .

[0027] like Figures 11-12 As shown, in another preferred embodiment, the injection molding surface 201 of the front mold 2 is provided with a plurality of pouring gates 202 , and the pouring gates 202 are connected to the pouring runners 601 .

[0028] By providing a plurality of pouring ports 202, the efficiency of molten plastic injection is improved, thereby improving production efficiency.

[0029] like Fig.10As shown, the pouring runner 601 includes a main runner 6011 and a plurality of branch runners 6012, one end of the branch runner 6012 is connected to the main runner 6011, and the other end is connected to the cavity 1 through the pouring port 202. The plurality of branch runners 6012 are arranged to be connected to the pouring port 202, so as to reduce the volume filled by a single pouring port 202, improve the filling efficiency in the cavity 1, ensure that the cavity 1 is filled sufficiently, reduce the probability of filling blockage, and improve production efficiency.

[0030] like Figure 2 As shown, the anti-scratch strip injection molded part 5 is formed by the injection mold of the present invention; the anti-scratch strip injection molded part 5 comprises a vehicle door connection area 501 buckled with the vehicle door and an anti-scratch area 502 .

[0031] like Fig.11 As shown, the injection molding surface 201 of the front mold 2 includes a connection molding area 2011 and an anti-scratch molding area 2012 corresponding to the door connection area 501 and the anti-scratch area 502 respectively; preferably, the pouring port 202 is connected to the connection molding area 2011 of the injection molding surface 201; the injection molding part 5 after solidification needs to undergo secondary processing on the connection molding area 2011 to eliminate excess injection molding material at the pouring port 202. The connection molding area 2011, as the part where the anti-scratch strip injection molding part 5 is connected to the door, does not need to meet the decorative effect, and is easy to process; if the pouring port 202 is connected to the anti-scratch molding area 2012, the anti-scratch molding area 2012 is processed after molding to eliminate excess injection molding material at the pouring port 202. The secondary processing will affect the appearance of the injection molding part 5, especially the anti-scratch molding area 2012 as a part of the exterior trim of the automobile anti-scratch strip plays a certain decorative effect. It is difficult to ensure the consistency of the overall appearance of the anti-scratch molding area 2012 through local secondary processing. The overall secondary processing is cumbersome and has low work production efficiency.

[0032] like Fig.10 and Fig.12 As shown, in another preferred embodiment, the cooling pipeline 701 is a pipeline arranged circumferentially around the pouring port 202, and a plurality of cooling pipelines 701 are arranged at intervals.

[0033] In actual operation, during the cooling and solidification stage after the injection of the pouring gate 202 is completed, the injection molding machine still provides pressure through the pouring gate 202 to maintain the pressure in the cavity 1, and continues to inject molten plastic when volume shrinkage occurs during the cooling process to meet the injection molding requirements of the injection molded part 5. In this process, it is necessary to reasonably design the cooling pipeline 701 to avoid the pouring gate 202 cooling first during cooling, so that the pouring gate 202 cannot continue to feed and maintain pressure during the pressure maintenance process, thereby reducing the quality of the injection molded part 5.

[0034] By setting up multiple independently controlled cooling pipelines 701 in different zones and starting the cooling pipelines 701 at different times, it is effectively avoided that the pouring port 202 cools down first during cooling and solidification, which is not conducive to the injection molding machine connected to the pouring runner 601 to maintain pressure and feed the cavity 1. Specifically, a single pouring port 202 is provided with at least three cooling pipelines 701, and the first cooling pipeline 7011, the second cooling pipeline 7012 and the third cooling pipeline 7013 are sequentially provided in the direction away from the pouring port 202, and finally the first cooling pipeline 7011 is opened for cooling.

[0035] like Fig.12 As shown, in another preferred embodiment, a fluid monitoring module 10 is provided at the pouring gate 202 , and is configured to monitor the pressure and / or flow rate at the pouring gate 202 .

[0036] A fluid detection module is provided at the pouring port 202 to achieve higher measurement accuracy; at the same time, timely response measures are taken according to the detection data of the fluid detection module to improve the quality and pass rate of the injection molded part 5 .

[0037] Specifically, by setting up a fluid monitoring module 10 to monitor the flow rate, during the injection process, the flow rate remains unchanged as time changes, proving that the cavity 1 is filled smoothly and is not blocked; when the flow rate drops to 0, it proves that the filling is completed. At this time, the injection molding machine plays a pressure-maintaining role and starts the cooling component 7 to cool and solidify.

[0038] Specifically, by setting up a fluid monitoring module 10 to monitor the fluid pressure, during the injection process, the pressure gradually increases. When the pressure is stable and no longer changes, the filling of the cavity 1 is completed. At this time, the injection molding machine plays a role of maintaining pressure, and at the same time starts the cooling component 7 to cool and solidify; through the fluid monitoring module 10, the filling situation of the cavity 1 is judged, and then the injection pressure, injection speed and melting temperature of the injection molding machine are adjusted; specifically, if the filling is not smooth, the filling degree of the cavity 1 is ensured by increasing the injection pressure of the injection molding machine, increasing the melting temperature, etc., so as to improve the molding quality of the injection molded part 5.

[0039] Specifically, the fluid monitoring module 10 is a miniature pressure-flow composite sensor, or a pressure sensor, or a flow sensor; further, the pressure sensor can be M5277-C3313U-250BG or KS-NEE-B25D-MV; the flow sensor can be an ultrasonic flow sensor (such as Keyence FD-Q32C) or a turbine flow sensor (such as OmegaFP8501A).

[0040] like Figure 5 As shown, in another preferred embodiment, the fluid transmission device 901 is a fan.

[0041] In this embodiment, the fluid transmission device 901 is a fan, which is connected to any exhaust channel 4 . When the fan is started, the gas in the cavity 1 flows; specifically, the gas in the cavity 1 is discharged from each exhaust channel 4 .

[0042] like Figure 7 As shown, in another preferred embodiment, the fluid transfer device 901 is a negative pressure device or a positive pressure device.

[0043] By means of a negative pressure device or a positive pressure device, the air in the cavity 1 is absorbed or filled with air to make the gas in the cavity 1 flow. On the one hand, it absorbs dust and other inclusions in the cavity 1; on the other hand, it cooperates with the sensing device 902 to detect the smoothness of the exhaust passage 4 of the cavity 1, thereby improving the molding quality of the injection molded part 5.

[0044] like Figures 5 to 8 As shown, in another preferred embodiment, the induction device 902 is a thin induction strip or a micro fan, which is arranged at the outlet of the exhaust channel 4.

[0045] By setting a sensing device 902 at the outlet of the exhaust channel 4, the gas flow is materialized and cooperated with the flow transmission device to facilitate the observation and detection of the smoothness of the exhaust channel 4, thereby improving the efficiency of the detection of the exhaust channel 4; at the same time, the cavity 1 is cleaned and the inclusions in the cavity 1 are discharged to ensure the cleanliness of the cavity 1, avoid blockage, and improve the molding quality of the injection molded part 5.

[0046] When the fan is started, the outside air enters the cavity 1 through the fan, and the gas in the cavity 1 is discharged from the exhaust channel 4. When the thin sensor strip at the mouth of the exhaust channel 4 moves under the action of the airflow, the exhaust channel 4 is unobstructed, and vice versa. The design of the thin sensor strip is mainly to reduce the difficulty of detection for the operator. If the thin sensor strip is not designed and the airflow is sensed, such as the skin's perception of the airflow, there will be great difficulties. First, it is difficult to perceive the airflow. If the wind speed is low, it is not easy to perceive, which increases the difficulty of judgment. Second, there are multiple exhaust channels 4, and the positions are not close, so the efficiency of sensing one by one is low.

[0047] Perception through vision is relatively easy and efficient. One only needs to adjust the viewing angle to obtain the conditions of all four exhaust ducts and make a quick judgment.

[0048] like Figures 5 and 6 As shown, in order to further reduce the difficulty of judgment, the thin sensing strip is designed to be contrasted with different color segments, for example, black and white segments are alternately arranged, so that the observer can more easily detect the fluttering when the strip is fluttering.

[0049] Optionally, the thin sensing strip cooperates with a fan, or a negative pressure device, or a positive pressure device; preferably, the thin sensing strip cooperates with a positive pressure device.

[0050] like Figure 7-8 As shown, further, the sensing device 902 can be a micro fan arranged in the exhaust channel 4. When there is wind, the blades of the micro fan rotate, and the exhaust channel 4 is unblocked, and injection molding can be performed. The blades in the micro fan can be processed by optical parallax. Preferably, a micro fan includes three blades, one of which includes a layer of glass beads to reflect light. The observer can clearly find out whether the blade is rotating by irradiating it. The micro fan can cooperate with the fan, and can also cooperate with the positive pressure device and the negative pressure device.

[0051] like Figure 5 As shown, in another preferred embodiment, the fan is connected to a filtering device 11.

[0052] By providing the filter device 11 , the air entering the cavity 1 is filtered to ensure that the air entering the cavity 1 from outside the cavity 1 is free of impurities, thereby improving the quality of the injection molded part 5 .

[0053] like Figures 1 to 13 As shown, in another embodiment, a method for injection molding of a colorful anti-scratch strip adopts the injection molding method of the colorful anti-scratch strip injection mold in the above embodiment, and the steps include: Step 1: The front mold 2 and the rear mold 3 are molded together; Step 2: The exhaust auxiliary mechanism 9 is connected to the exhaust channel 4, the fluid transmission device 901 is started, the cavity 1 is cleaned, and the changes of the sensing device 902 are observed at the same time; Step 3: When it is observed that the sensing device is changed by the action of the fluid transmission device, the fluid transmission device 901 is turned off; the injection molding machine, the hot runner assembly 6 and the fluid monitoring module 10 are started, and the molten plastic is injected into the mold cavity 1 through the pouring runner 601; Step 4: After pouring is completed, the cooling assembly 7 is started, and multiple cooling pipelines 701 are gradually started in time periods from the outside to the center with the pouring port 202 as the center (if a single pouring port 202 is provided with a first cooling pipeline 7011 along the circumferential direction, a second cooling pipeline 7012 and a third cooling pipeline 7013 are sequentially provided in the direction away from the pouring port 202, the first cooling pipeline 7011, the second cooling pipeline 7012 and the third cooling pipeline 7013 are arranged at intervals, and the third cooling pipeline 7013, the second cooling pipeline 7012 and the first cooling pipeline 7011 are started in sequence); Step 5: Start the demoulding assembly 8 to demould.

[0054] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A colorful anti-scratch strip injection mold, characterized in that: include: A mold cavity (1) is formed by enclosing a front mold (2) and a rear mold (3); An exhaust passage (4) is provided on the front mold (2) and / or the rear mold (3) and is in communication with the mold cavity (1); The hot runner assembly (6) comprises a pouring runner (601); the front mold (2) is sandwiched between the rear mold (3) and the hot runner assembly (6); A cooling assembly (7), comprising a plurality of independent cooling pipelines (701), embedded in the front mold (2) and the rear mold (3); A demoulding assembly (8) connected to the rear mold (3) and configured to eject the injection molded part (5) from the injection mold; An exhaust assist mechanism (9), comprising a fluid transmission device (901) and a sensing device (902), wherein the fluid transmission device (901) is connected to one of the exhaust channels (4), and the sensing device (902) is connected to the remaining exhaust channels (4); The injection molding surface (201) of the front mold (2) is provided with a texture; one end of the pouring runner (601) is connected to the injection molding machine, and the other end is communicated with the mold cavity (1).

2. The colorful anti-scratch strip injection mold according to claim 1, characterized in that: The injection molding surface (201) of the front mold (2) is provided with a plurality of pouring gates (202), and the pouring gates (202) are connected to the pouring runner (601).

3. The multi-colored anti-scratch strip injection mold according to claim 2, characterized in that: The cooling pipeline (701) is a pipeline arranged circumferentially around the pouring port (202), and a plurality of cooling pipelines (701) are arranged at intervals.

4. The multi-colored anti-scratch strip injection mold according to claim 3, characterized in that: The pouring port (202) is provided with a fluid monitoring module (10) configured to monitor the pressure and / or flow rate at the pouring port (202).

5. The multi-colored anti-scratch strip injection mold according to claim 4, characterized in that: The fluid transmission device (901) is a fan.

6. The multi-colored anti-scratch strip injection mold according to claim 4, characterized in that: The fluid transmission device (901) is a negative pressure device or a positive pressure device.

7. The multi-colored anti-scratch strip injection mold according to claim 5 or 6, characterized in that: The induction device (902) is a thin induction strip or a micro fan, and is arranged at the outlet of the exhaust channel (4).

8. The multi-colored anti-scratch strip injection mold according to claim 5, characterized in that: A filtering device (11) is provided in the fan.

9. A method for injection molding a colorful anti-scratch strip, characterized in that: The injection molding method using the colorful anti-scratch strip injection mold according to claims 4 to 8 comprises the following steps: Step 1: the front mold (2) and the rear mold (3) are molded together; Step 2: the exhaust auxiliary mechanism (9) is connected to one of the exhaust channels (4), the fluid transmission device (901) is started, the mold cavity (1) is cleaned, and changes in the sensing device (902) are observed at the same time; Step 3: when it is observed that the sensing device changes due to the action of the fluid transmission device, the fluid transmission device (901) is turned off; the injection molding machine, the hot runner assembly (6) and the fluid monitoring module (10) are started, and the molten plastic is injected into the mold cavity (1) through the pouring runner (601); Step 4: After pouring is completed, the cooling component (7) is started, and the plurality of cooling pipelines (701) are started gradually in time periods from the outside to the center with the pouring port (202) as the center; Step 5: Start the demoulding assembly (8) to demould.

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