Multi-process combined injection molding equipment and injection molding method

Abstract

The invention relates to multi-process combined injection molding equipment and an injection molding method.The injection molding equipment comprises a mold closing assembly, a range finder, a first injection assembly, a gas injection assembly, a second injection assembly, a manipulator and an infrared heater, the mold closing assembly comprises a fixed mold plate and a movable mold plate which are oppositely arranged, and a mold is arranged between the fixed mold plate and the movable mold plate; the range finder is arranged on the mold; the first injection assembly is used for injecting a foaming material of a product main body into the mold, and the first injection assembly communicates with the gas injection assembly; the second injection assembly is used for injecting a second component material into the mold; the manipulator is used for clamping the thermoplastic organic sheet, and the infrared heater is used for heating the thermoplastic organic sheet. Compared with the prior art, integrated lightweight product machining is completed on the same equipment, multiple parts are directly connected when formed in the mold, product transfer and recombination caused by multiple independent procedures are avoided, and the production efficiency and the production quality are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding equipment, and in particular to a multi-process combined injection molding equipment and an injection molding method. Background Art

[0002] Fiber-reinforced thermoplastic composites are a general term for composite materials obtained by reinforcing various thermoplastic polymers with glass fibers, carbon fibers, aramid fibers, etc. There are many forms such as short fiber reinforcement, long fiber reinforcement, continuous fiber reinforcement and fabric reinforcement. Fiber-reinforced thermoplastic composites are widely used in aerospace, automobile, construction and other fields due to their excellent comprehensive performance, and have broad development prospects. Hot pressing is currently an important process for producing fiber-reinforced thermoplastic composite parts. Its basic principle is to heat the pre-prepared thermoplastic composite sheet to above the melting point or softening point of the thermoplastic resin matrix, and then quickly put it into the mold cavity to close the mold and press it into the final product shape; the hot pressing technology of fiber-reinforced thermoplastic composites is stable, easy to mechanize and automate, and has high production efficiency.

[0003] Injection molding foaming technology is divided into chemical foaming and physical foaming processes. The physical foaming technology is to fully mix and meter the polymer melt and supercritical fluid such as N2, CO2 through the screw plasticizing process, and then complete the production of the corresponding parts through injection. One of the significant features of physical foaming injection molding technology is that its physical foaming agent, i.e., gas, comes from nature and is more environmentally friendly than the chemical foaming process. This has led to this technology being widely used in the production and processing of automotive parts in recent years. At present, in order to further improve the weight reduction effect of the product, the precise micro-opening of the mold can be controlled to provide foaming space so that the melt can be fully foamed. The injection molding process can obtain products with more complex shapes by changing the shape of the mold.

[0004] The development of new energy vehicles has made it impossible for parts formed by a single technology, such as multi-component technology and foaming technology, to meet the growing product design needs. Some parts adopt an integrated design and put forward higher technical requirements; while reducing weight, some areas need to be reinforced, and the second or third component materials are used to complete the function and appearance requirements, such as some parts use special materials with unique geometric shapes to reduce wind resistance; at the same time, conventional closed mold foaming technology cannot reduce weight as expected, and open mold compression technology and template parallelism control technology are also needed to further improve the weight reduction effect and ensure the uniformity of product wall thickness.

[0005] Unprecedented integrated components are formed in one step within a molding cycle of just tens of seconds, which greatly improves production efficiency and product qualification rate compared with processes or procedures such as step-by-step injection that require coordination between different production lines; it has both weight reduction effects and local reinforcement in some areas, and different materials and components bring more appearance effects and functional requirements to the components; the one-piece thermoplastic material solution enables it to be reused as post-consumer recycled material to achieve the goal of sustainable development.

[0006] In order to complete the processing of such highly integrated plastic parts, multi-technology combined injection molding equipment is a necessary condition for processing and molding. Technological innovation has promoted the development of plastic processing technology and plastic machinery, and also set a new trend for the industry. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a multi-process combined injection molding equipment and an injection molding method, so as to complete multiple production processes of a product on the same equipment and improve product quality and production efficiency.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] A multi-process combined injection molding device, comprising a mold clamping component, a distance meter, a first injection component, a gas injection component, a second injection component, a manipulator and an infrared heater;

[0010] The mold clamping assembly comprises a fixed mold plate and a movable mold plate which are arranged opposite to each other, and a mold is arranged between the fixed mold plate and the movable mold plate; the distance meter is arranged on the mold and is used to detect the distance between the two mold surfaces of the mold;

[0011] The first injection assembly is connected to the gas injection assembly, the first injection assembly has a first component material, the gas injection assembly is used to inject a supercritical fluid into the first component material to form a foaming material, and the first injection assembly is used to inject the foaming material of the product body into the mold;

[0012] The second injection assembly is used to inject a second component material into the mold;

[0013] The manipulator is used for clamping the thermoplastic organic sheet, and the infrared heater is used for heating the thermoplastic organic sheet.

[0014] In one embodiment, the mold includes a movable mold and a fixed mold, the fixed mold is provided with a mold cavity, the movable mold has a retractable first core and a second core, when the thermoplastic organic sheet is hot-pressed, the first core extends out and abuts against the thermoplastic organic sheet;

[0015] When the second injection assembly injects the second component material, the second core extends to form a closed second component molding cavity in the fixed mold.

[0016] In one embodiment, the first injection assembly is disposed on a side of the fixed plate away from the movable plate, and a first injection port is disposed on the fixed plate, and the first injection port is communicated with the first injection assembly;

[0017] A second injection port is provided on the side of the fixed mold, and the second injection port is communicated with the second injection assembly.

[0018] In one embodiment, a plurality of first driving members are provided on a side of the movable template away from the fixed template, the rangefinder corresponds to the first driving members one by one, the direction in which the fixed template and the movable template are relatively arranged is a first direction, and the installation position of the rangefinder is arranged colinearly with the installation position of the first driving member along the first direction.

[0019] In one of the embodiments, the injection molding device further includes a controller, which is electrically connected to the first driving member and the rangefinder, respectively, and is used to control the first driving member at a corresponding position according to the detection result of the rangefinder.

[0020] In one of the embodiments, a plurality of second driving members are provided on a side of the movable platen close to the fixed platen, and the controller is connected to the second driving members for controlling the opening and closing of the second driving members.

[0021] In one embodiment, the first injection assembly includes an injection barrel and an injection screw inserted into the injection barrel, the injection barrel is provided with an injection port and a locking nozzle, the injection port is connected to the injection assembly, when the first component material is plasticized in the injection barrel, the locking nozzle opens and is connected to the cavity in the mold.

[0022] In one embodiment, the mold clamping assembly further includes an intermediate template, the intermediate template is located between the fixed template and the movable template, the movable template and the fixed template are respectively provided with a first mold and a second mold, and the two sides of the intermediate template are respectively provided with a third mold and a fourth mold, and the intermediate template can rotate around a vertical axis so that the mold clamping assembly has a first mold clamping state and a second mold clamping state;

[0023] In the first mold-closing state, the first mold is molded with the third mold, and the second mold is molded with the fourth mold; in the second mold-closing state, the first mold is molded with the fourth mold, and the second mold is molded with the third mold.

[0024] In one embodiment, the fixed mold plate is provided with a first injection port, the movable mold plate is provided with a second injection port, the first injection port is communicated with the first injection assembly, and the second injection port is communicated with the second injection assembly.

[0025] A multi-process combined injection molding method, applicable to the above-mentioned injection molding equipment, is characterized in that it includes the following specific steps:

[0026] S10: using a manipulator to clamp the thermoplastic organic sheet, placing it on an infrared heater, and heating it for a certain period of time;

[0027] S20: using a robot to clamp the thermoplastic organic sheet from the infrared heater and place it in the mold;

[0028] S30: using a mold clamping assembly to clamp the thermoplastic organic sheet and hot-press the thermoplastic organic sheet to cool and form the thermoplastic organic sheet;

[0029] S40: injecting a second component material into the mold using a second injection assembly to form a modified portion on the thermoplastic organic sheet and cooling the formed portion;

[0030] S50: injecting a supercritical fluid into the first injection component by using a gas injection component, the first component material forms a foaming material in the first injection component, the first injection component injects the foaming material into the mold, and the mold clamping component drives the mold to slightly open for foaming, so as to form a main body on the thermoplastic organic sheet and the modified part.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The above-mentioned multi-process combined injection molding equipment is provided with a mold clamping component, a first injection component, a gas injection component, a second injection component, a manipulator and an infrared heater. During use, the manipulator can be used to clamp the thermoplastic organic sheet and place it in the infrared heater for heating to soften the thermoplastic organic sheet; the manipulator is used to clamp the thermoplastic organic sheet from the infrared heater and place it in the mold for hot pressing molding; then the second injection component is used to inject the second component material into the mold to form a modified part on the thermoplastic organic sheet for functional modification of the product; the gas injection component injects a supercritical fluid into the first injection component so that the first component material is A foaming material is formed in the first injection component, and then the foaming material is injected into the mold by using the first injection component. After the injection is completed, the mold is opened for foaming, and the main part is formed on the thermoplastic organic sheet and the modified part, so that the processing of the fiber sheet reinforcement part, the modified part and the main part of the injection molded product can be completed on the same equipment, and multiple parts are directly connected when they are formed in the mold, avoiding the movement and recombination of multiple parts, effectively improving production efficiency and production quality; at the same time, the rangefinder on the mold can also detect the distance between the two mold surfaces of the mold in real time, which is conducive to ensuring the parallel movement of the mold and the uniformity of the foaming thickness of the product during the mold opening and foaming process.

[0033] 2. The injection molding equipment sets a first core and a second core in the movable mold, and sets a cavity in the fixed mold. The thermoplastic organic fiber sheet reinforcement part, the modification part and the main part of the injection product are sequentially molded in the mold. The processing of each effective part can be completed in one mold, avoiding frequent mold replacement. The structure is simple, effective and convenient.

[0034] 3. In order to achieve accurate movement of the movable mold and ensure that the movable mold and the fixed mold always maintain parallel movement, multiple distance meters are installed on the mold. The installation position of the distance meter corresponds to the installation position of the first driving member. Therefore, when the first driving member on the movable mold plate moves, the distance meter can accurately measure the distance change between the corresponding position of the first driving member on the movable mold. The distance meter feeds back the measurement result to the controller, and the controller controls the corresponding first driving member to adjust the moving speed and distance to ensure that the measurement results between multiple distance meters are consistent within a certain range, effectively improving the accuracy and parallelism of the movable mold movement, and ensuring that the product thickness is more uniform and more accurate during the injection molding and foaming process.

[0035] 4. The second driving member is used to assist the first driving member in providing power to assist the movable mold plate in opening the mold, and provides the movable mold plate with a force opposite to the first driving member, that is, from the fixed mold direction toward the movable mold opening direction, and its auxiliary mold opening force tends to be constant. When the distance between the movable mold and the fixed mold is too large, the driving force of the first driving member becomes larger, and together they assist the movable mold plate in reducing the mold opening speed or making it relatively still. When the distance between the movable mold and the fixed mold is too small, the driving force of the first driving member becomes smaller, and together they increase the speed of the movable mold plate away from the fixed mold plate. This control method helps to make the precise mold opening process of the movable mold plate more stable and controllable. At the same time, the second driving member can also be activated or not through the controller, which effectively improves the degree of freedom of process programming and the accuracy and repeatability of the entire mold opening and foaming process.

[0036] 5. Since the mold closing assembly is provided with a fixed mold plate, a movable mold plate and an intermediate plate, the intermediate mold plate can rotate around a vertical axis, and the fixed mold plate is connected to the first injection assembly, and the movable mold plate is connected to the second injection assembly, the modified part and the main body part can be respectively formed in the molds on both sides of the intermediate plate, which is beneficial to reduce the complexity of the cavity and the core in the mold, improve the utilization rate of the mold plate, and facilitate the molding of larger products. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of an injection molding device in one embodiment of the present invention.

[0038] Figure 2 It is a schematic structural diagram of an injection molding device in another embodiment of the present invention.

[0039] Figure 3 It is a schematic structural diagram of a mold clamping assembly in one embodiment of the present invention.

[0040] Figure 4 Schematic diagram of the structure of the first injection assembly in one embodiment of the present invention.

[0041] Figure 5 It is a schematic structural diagram of a fixed mold in one embodiment of the present invention.

[0042] Figure 6 Schematic diagram of the process of an injection molding method in one embodiment of the present invention.

[0043] Figure 7 This is the first setting page of the injection molding equipment in one embodiment of the present invention.

[0044] Figure 8 This is a second setting page of the injection molding equipment in one embodiment of the present invention.

[0045] 1. Injection molding equipment; 2. Clamping mold assembly; 3. First driving member; 4. Second driving member; 5. Sealing frame; 6. Fixed mold plate; 7. Moving mold plate; 8. Slide rail; 9. Pull rod; 10. Intermediate mold plate; 11. Distance meter; 12. First injection assembly; 13. Gas injection port; 14. Locking nozzle; 15. Back pressure assembly; 16. Injection barrel; 17. Injection screw; 18. Barrel; 19. Gas injection assembly; 20. Second injection assembly; 21. Manipulator; 22. Infrared heater; 23. Controller; 24. Mold; 25. Moving mold; 26. Fixed mold; 27. Cavity. DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0047] A multi-process combined injection molding device 100 and an injection molding method are described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 and Figure 2 As shown, in one embodiment, a multi-process combined injection molding device 100 is provided, including a mold clamping assembly 10, a distance meter 20, a first injection assembly 30, an air injection assembly 40, a second injection assembly 50, a robot 60 and an infrared heater 70.

[0049] The mold clamping assembly 10 includes a fixed mold plate 14 and a movable mold plate 15 that are arranged opposite to each other, and a mold 90 is arranged between the fixed mold plate 14 and the movable mold plate 15; a distance meter 20 is arranged on the mold 90 to detect the distance between the two mold surfaces of the mold 90;

[0050] In addition, the first injection assembly 30 is used to inject the first component material of the product body into the mold 90. The first injection assembly 30 is connected to the gas injection assembly 40, and the gas injection assembly 40 is used to inject supercritical fluid into the first component material; the second injection assembly 50 is used to inject the second component material into the mold 90; the manipulator 60 is used to clamp the thermoplastic organic sheet, and the infrared heater 70 is used to heat the thermoplastic organic sheet.

[0051] The above-mentioned multi-process combined injection molding equipment 100 is provided with a mold clamping component 10, a first injection component 30, an air injection component 40, a second injection component 50, a manipulator 60 and an infrared heater 70. During use, the manipulator 60 can be used to clamp the thermoplastic organic sheet and place it in the infrared heater 70 for heating to soften the thermoplastic organic sheet; the manipulator is used to clamp the thermoplastic organic sheet from the infrared heater 70 and place it in the mold 90 for hot pressing molding; then the second injection component 50 is used to inject the second component material into the mold 90 to form a modified part on the thermoplastic organic sheet for functional modification of the product; the air injection component 40 injects a supercritical fluid into the first injection component 30 to make the first component material The material forms a foaming material in the first injection assembly 30, and then the foaming material is injected into the mold 90 by the first injection assembly 30. After the injection is completed, the mold is opened for foaming to form a main body on the thermoplastic organic sheet and the modified part, so that the processing of the fiber sheet reinforcement part, the modified part and the main body of the injection molded product can be completed on the same equipment, and the multiple parts are directly connected to form an integrated structure when they are molded in the mold 90, avoiding the step-by-step molding and transfer process of the multiple parts, and effectively improving the production efficiency and production quality; at the same time, the rangefinder 20 on the mold 90 can also detect the distance between the two mold surfaces of the mold 90 in real time, which is conducive to ensuring the parallel movement of the mold 90 and the uniformity of the foaming thickness of the product during the mold opening and foaming process.

[0052] Specifically, in one embodiment, the robot 60 includes a six-axis robot arm and a clamping member connected thereto in conventional technology, wherein the six-axis robot arm is used to improve the mobility, and the clamping member is used to clamp the thermoplastic organic sheet.

[0053] Specifically, in one embodiment, the injection molding equipment 100 also includes a sealing frame 13 and a telescopic driving component. The sealing frame 13 is arranged on the fixed mold 92. The sealing frame 13 is arranged around the perimeter area of ​​the injection molded foam product and is used to abut against the four sides of the injection molded foam product. The telescopic driving component is connected to the sealing frame 13 and is used to change the ejection distance and force of the sealing frame 13.

[0054] In addition, the sealing frame 13 includes a plurality of different sections to adapt to different circumferential shapes of products. Each section has an independent cooling water path to prevent it from being stuck due to thermal expansion after continuous contact with high-temperature plastic melt. Each section is mechanically connected as a whole and connected to the telescopic drive member to control the ejection distance and force of the sealing frame 13. In addition, the controller can be connected to the telescopic drive member to control the hydraulic pressure and flow of the telescopic drive member.

[0055] The injection molding device 100 is further provided with a retractable sealing frame 13, which can abut against the four sides of the foamed product and is used to seal the foamed product on the parting surface of the mold 90 during the mold opening and foaming process. Since the sealing frame 13 is retractable and can be set by the controller, the pressure and flow of the circuit can be controlled by Figure 7 The first page of the setting is used to accurately offset the expansion force of the molten glue toward the mold surface during the mold opening and foaming process to avoid glue overflow during the foaming process.

[0056] Specifically, Figure 3 As shown, in one embodiment, the clamping assembly 10 also includes a bed support and a slide rail 16, the fixed mold plate 14 is fixedly connected to the slide rail 16, the movable mold plate 15 is slidably connected to the slide rail 16, the fixed mold plate 14 and the movable mold plate 15 are arranged opposite to each other in the horizontal direction, and a plurality of pull rods 17 are arranged between the fixed mold plate 14 and the movable mold plate 15, the pull rods 17 pass through the fixed mold plate 14 and the movable mold plate 15 in sequence, and the movable mold plate 15 can slide along the pull rods 17.

[0057] Specifically, Figure 3 and Figure 5 As shown, in one embodiment, the mold 90 includes a movable mold 91 and a fixed mold 92. The fixed mold 92 is provided with a cavity 921. The movable mold 91 has a retractable first core and a second core. When the thermoplastic organic sheet is hot-pressed, the first core extends out to abut against the thermoplastic organic sheet to fix the thermoplastic organic sheet; when the second injection assembly 50 injects the second component material, the second core extends out to form a closed second component molding cavity in the fixed mold 92.

[0058] Specifically, in one embodiment, the first injection assembly 30 is disposed on a side of the fixed mold plate 14 away from the movable mold plate 15, and a first injection port is disposed on the fixed mold plate 14, and the first injection port is communicated with the first injection assembly 30;

[0059] A second injection port is disposed on the side of the fixed mold 92 , and the second injection port is connected to the second injection assembly 50 , wherein the side of the fixed mold 92 is the non-operating side of the fixed mold 92 .

[0060] The injection molding equipment 100 sets a first core and a second core in a movable mold 91, and sets a cavity 921 in a fixed mold 92. The fiber sheet reinforcement part, the second component material modification part and the foam material main body part of the injection molded product are sequentially molded in the mold 90. This integrated equipment enables the processing of each process in the product to be completed in one mold 90 and form an integrated structure, avoiding frequent replacement of the mold 90. The structure is simple, effective and convenient.

[0061] Specifically, Figure 3As shown, in one embodiment, a plurality of first driving members 11 are provided on the side of the movable template 15 away from the fixed template 14, the rangefinder 20 corresponds one-to-one to the first driving members 11, the direction in which the fixed template 14 and the movable template 15 are relatively arranged is the first direction, and the installation position of the rangefinder 20 is arranged colinearly with the installation position of the first driving member 11 along the first direction.

[0062] Furthermore, if Figure 1 and Figure 2 As shown, in one embodiment, the injection molding device 100 further includes a controller 80 , which is electrically connected to the first driving member 11 and the distance meter 20 , respectively, and is used to control the first driving member 11 at a corresponding position according to the detection result of the distance meter 20 .

[0063] In order to achieve accurate movement of the movable mold 91 and ensure that the movable mold 91 always maintains parallel movement with the fixed mold 92, a plurality of rangefinders 20 are installed on the mold 90. The installation position of the rangefinder 20 corresponds to the installation position of the first driving member 11. Therefore, when the first driving member 11 on the movable mold plate 15 moves, the rangefinder 20 can accurately measure the distance change between the position corresponding to the first driving member 11 on the movable mold plate 15. The rangefinder 20 feeds back the measurement result to the controller 80, and the controller 80 controls the corresponding first driving member 11 to adjust the moving speed and distance, so as to ensure that the measurement results between the plurality of rangefinders 20 remain consistent within a certain range, thereby effectively improving the accuracy and parallelism of the movement of the movable mold 91, and ensuring that the product thickness is more uniform and more accurate during the injection molding and foaming process.

[0064] Especially during the mold opening and foaming process, the rangefinder 20 can accurately measure the real-time distance between the corresponding movable mold 91 and the fixed mold 92 at their respective positions, effectively improving the accuracy and repeatability of the parallelism of the movable mold 91, and ensuring a more uniform product thickness during the mold opening and foaming process, which is suitable for large-scale mass production.

[0065] Furthermore, in one embodiment, the first driving member 11 includes a high-pressure oil cylinder, a proportional valve and a hydraulic power source. The high-pressure oil cylinder is connected to the end surface of the movable template 15 away from the fixed template 14. The proportional valve is respectively connected to the high-pressure oil cylinder and the hydraulic power source. The controller 80 is connected to the proportional valve for controlling the flow and pressure of the first driving member 11 through the proportional valve according to the detection result of the rangefinder 20.

[0066] The first driving member 11 uses a high-pressure oil cylinder to drive the moving template 15 to move, has a greater driving force, and can be suitable for larger and heavier molds 90. At the same time, the controller 80 can control the moving speed and distance of the high-pressure oil cylinder by controlling the flow and pressure of the proportional valve, and the control is more precise.

[0067] In this specific embodiment, a valve block is provided between the high-pressure oil cylinder and the proportional valve, and a high-pressure valve block is provided between the proportional valve and the hydraulic power source.

[0068] Furthermore, if Figure 3 As shown, in one embodiment, a plurality of second driving members 12 are provided on one side of the movable plate 15 close to the fixed plate 14, and the second driving members 12 are connected to the controller, and the controller can control the opening and closing of the second driving members 12 (such as Figure 7 As shown), in the mold opening and foaming process, the second driving member 12 serves as an auxiliary power to provide a mold opening force for the movable template 15, and the mold opening force tends to be constant during the mold opening and foaming process.

[0069] In a specific embodiment, two second driving members 12 are provided to provide sufficient auxiliary power for mold opening for the movable mold plate 15 .

[0070] The second driving member 12 is used to assist the first driving member 11 and provide auxiliary mold opening power for the movable template 15. Its force is opposite to that of the first driving member 11. Therefore, during the mold opening and foaming process, the second driving member 12 provides a mold opening auxiliary force that tends to be constant. When the distance between the movable mold 91 and the fixed mold 92 is too large, the driving force of the first driving member 11 becomes larger, and the movable template 15 is jointly assisted to reduce the mold opening speed or remain relatively still relative to the fixed template 14. When the distance between the movable mold 91 and the fixed mold 92 is too small, the driving force of the first driving member 11 becomes smaller, and the movable template 15 is jointly assisted to increase the mold opening speed relative to the fixed template 14. In this way, the first driving members 11 at different positions form a closed loop with the rangefinder 20 at the corresponding position, and under the joint action of the second driving member 12, they act on the movable template 15 together, making the precise process of mold opening and foaming more stable and controllable. At the same time, the second driving member 12 can also be activated or not through the controller 80, which effectively improves the design freedom of the process program and the real-time parallelism control and repeatability of the movable template 15 during the precise mold opening process.

[0071] like Figure 7 As shown, in the first page, the controller can control the opening and closing of the second driving member, and can also control the hydraulic pressure and flow of the telescopic driving member, thereby controlling the ejection distance and force of the sealing frame.

[0072] Specifically, in one embodiment, the rangefinder 20 includes a transmitter and a receiver, the transmitter is arranged on the fixed mold 92 or the movable mold 91, and the receiver is correspondingly arranged on the movable mold 91 or the fixed mold 92, the transmitter and the receiver are arranged opposite to each other, and the receiver is used to receive the signal transmitted by the transmitter; the installation position of the transmitter is parallel to the mold surface of the fixed mold 92 or the movable mold 91, and the installation position of the receiver is correspondingly parallel to the mold surface of the movable mold 91 or the fixed mold 92.

[0073] Among them, the rangefinder 20 includes a transmitter and a receiver, and the transmitter and the receiver are respectively installed at the positions where the movable mold 91 and the fixed mold 92 are parallel to the mold surface. The rangefinder 20 measures the distance between the movable mold 91 and the fixed mold 92, that is, measures the distance between the mold surface of the movable mold 91 and the mold surface of the fixed mold 92, which effectively improves the accuracy of the test results of the rangefinder 20, so that the controller 80 controls the parallelism more accurately.

[0074] Furthermore, in one embodiment, a first mounting member is provided on the transmitter, and the first mounting member is connected to the fixed mold 92 or the movable mold 91 , and a second mounting member is provided on the receiver, and the second mounting member is correspondingly connected to the movable mold 91 or the fixed mold 92 .

[0075] In this specific embodiment, the first mounting member is mounted on the movable mold 91 , and the second mounting member is mounted on the fixed mold 92 , that is, the transmitter is mounted on the movable mold 91 , and the receiver is mounted on the fixed mold 92 .

[0076] In this specific embodiment, the rangefinder 20 is a magnetic induction electronic ruler, the transmitter is an induction magnetic block, the receiver receives the position information of the induction magnetic block, and converts the magnetic signal into distance information, and then transmits the distance information to the controller 80, with an accuracy of 0.01mm.

[0077] Furthermore, if Figure 3 As shown, in one embodiment, four first driving members 11 are provided, which are respectively arranged in four corner areas of the end surface of the movable template 15 away from the fixed template 14, and four distance meters 20 are provided. The distance meters 20 and the first driving members 11 at the corresponding installation positions are arranged colinearly along the direction in which the fixed template 14 and the movable template 15 are relatively arranged.

[0078] Specifically, Figure 4 As shown, in one embodiment, the first injection assembly 30 includes an injection barrel 34 and an injection screw 35 inserted into the injection barrel 34. The injection barrel 34 is provided with an injection port 31 and a locking nozzle 32. The injection port 31 is connected to the injection assembly 40. When the first component material is plasticized in the injection barrel 34, the locking nozzle 32 is opened and connected to the cavity 921 in the mold 90.

[0079] In addition, a feeding hopper is provided on the injection machine barrel for feeding the first component material during the plasticizing process.

[0080] Specifically, Figure 1As shown, in one embodiment, the mold clamping assembly 10 further includes an intermediate mold plate 18, which is located between the fixed mold plate 14 and the movable mold plate 15, and the movable mold plate 15 and the fixed mold plate 14 are respectively provided with a first mold and a second mold, and the two sides of the intermediate mold plate 18 are respectively provided with a third mold and a fourth mold, and the intermediate mold plate 18 can rotate around an axis perpendicular to the horizontal direction, so that the mold clamping assembly 10 has a first mold clamping state and a second mold clamping state;

[0081] In the first mold clamping state, the first mold is clamped with the third mold, and the second mold is clamped with the fourth mold; in the second mold clamping state, the first mold is clamped with the fourth mold, and the second mold is clamped with the third mold.

[0082] Furthermore, in one embodiment, a first injection port is provided on the fixed mold plate 14 , and a second injection port is provided on the movable mold plate 15 . The first injection port is connected to the first injection assembly 30 , and the second injection port is connected to the second injection assembly 50 .

[0083] The modified part and the main body can be formed in the molds mounted by the movable template 15 and the fixed template 14 respectively, which is beneficial to reduce the complexity of the cavity and core in the mold 90, improve the efficiency of template use, and improve the processing accuracy.

[0084] like Figure 6 As shown, in one embodiment, a multi-process combined injection molding method is provided, which is applicable to the above-mentioned injection molding device 100 and is characterized in that it includes the following specific steps:

[0085] S10: using the robot 60 to clamp the thermoplastic organic sheet, placing it in the infrared heater 70, and heating it for a certain period of time;

[0086] S20: using the robot 60 to clamp the thermoplastic organic sheet from the infrared heater 70 and place it in the mold 90;

[0087] S30: using the mold clamping assembly 10 to clamp the thermoplastic organic sheet for hot pressing, so that the thermoplastic organic sheet is cooled and formed;

[0088] S40: injecting a second component material into the mold 90 using the second injection assembly 50 to form a modified portion on the thermoplastic organic sheet and cooling the formed portion;

[0089] S50: The gas injection assembly 40 is used to inject a supercritical fluid into the first injection assembly 30. The first component material forms a foaming material in the first injection assembly 30. The first injection assembly 30 injects the foaming material into the mold 90. After the injection is completed, the mold clamping assembly 10 is used to drive the mold 91 to open slightly for mold foaming, so as to form a main body part on the thermoplastic organic sheet and the modified part.

[0090] Specifically, in one embodiment, step S50 includes the following specific steps:

[0091] S501: Perform zero point calibration on multiple rangefinders 20;

[0092] S502: Preset the opening and closing dimensions of the mold 90;

[0093] S503: injecting a supercritical fluid into the first injection assembly 30 using the gas injection assembly 40, the first component material forms a foaming material in the first injection assembly 30, the first injection assembly 30 injects the foaming material into the mold 90, and controlling the first driving member 11 so that the movable platen 15 moves away from the fixed platen 14 at a uniform speed;

[0094] S504: Acquire detection results of multiple rangefinders 20 during the movement of the movable template 15;

[0095] S505: controlling the plurality of first driving members 11 so that the detection results of the plurality of rangefinders 20 are consistent;

[0096] S506: When the detection results of the multiple distance meters 20 reach the opening and closing size, the first driving member 11 is controlled so that the movable plate 15 and the fixed plate 14 remain relatively still;

[0097] S507: while the moving template 15 is stationary, obtaining detection results of multiple rangefinders 20;

[0098] S508: Control the multiple first driving members 11 so that the detection results of the multiple rangefinders 20 are consistent with the opening and closing size until the foaming material is cooled and formed. Therefore, during micro-foaming, the controller 80 controls the multiple first driving members 11 by comparing the detection results between the multiple rangefinders 20, so that the detection results between the multiple rangefinders 20 are kept dynamically consistent, thereby achieving the parallelism between the movable mold 91 and the fixed mold 92 during the movement process; during foaming and cooling and forming, the controller 80 uses the preset opening and closing size of the mold 90 as a standard, compares the detection results of the rangefinder 20, and adjusts the driving force of the first driving member 11 in real time, ensuring that the detection results of the multiple rangefinders 20 are dynamically consistent with the opening and closing size of the mold 90, thereby achieving a higher product thickness uniformity.

[0099] In this specific embodiment, step S502 includes the following steps:

[0100] Preset the mold opening and foaming program, set the precision micro-opening speed and position of the mold 90, Figure 8 The precision mold opening setting information is displayed, where the first step is to open the mold to 0.5mm at a speed of 0.4mm / s, and the second step is to open the mold to 0.7mm at a speed of 0.4mm / s.

[0101] In this specific embodiment, step S503 includes the following steps:

[0102] The first injection assembly 30 injects the molten plastic containing gas during the last plasticizing process, and the molten plastic is injected with a metered supercritical fluid through the gas injection assembly 40. Under the action of back pressure, the supercritical fluid dissolves in the plastic molten plastic. After the injection is completed, the second driving member 12 and the first driving member 11 are activated and controlled to work together through the pressure holding end signal, so that the movable platen 15 drives the movable mold 91 to move away from the fixed mold 92 mounted on the fixed platen 14 in stages at a set speed and position.

[0103] Further, in one embodiment, in step S501, the following steps are included:

[0104] In the mold closing calibration state, a plurality of distance meters 20 are subjected to zero point calibration.

[0105] When performing zero-point calibration of the rangefinder 20, the calibration clamping force between the movable mold plate 15 and the fixed mold plate 14 is set to 50% of the maximum clamping force of the equipment. At this time, the clamping force will not be too large to cause excessive compression and deformation between the movable mold 91 and the fixed mold 92, and the clamping force will not be too small to cause the mold structure between the movable mold 91 and the fixed mold 92 to not be compacted, resulting in empty stroke. This effectively improves the calibration accuracy and helps to improve product production quality.

[0106] In the normal mode, the second driving member 12 is controlled to move the movable platen 15 close to the fixed platen 14 to enter the mold clamping calibration state, and the first driving member 11 is controlled to make the calibration mold clamping force between the movable platen 15 and the fixed platen 14 50% of the maximum mold clamping force.

[0107] Furthermore, in one embodiment, in step S505, the following specific steps are included:

[0108] Select any one of the rangefinders 20 as the target rangefinder 20, and the rangefinders 20 other than the target rangefinder 20 as other rangefinders 20, and obtain the difference between the detection result of the target rangefinder 20 and the detection result of the other rangefinders 20;

[0109] The first driving member 11 at the corresponding installation position of the target distance meter 20 is controlled according to the result difference, so that the movable platen 15 at the corresponding installation position approaches or moves away from the fixed platen 14.

[0110] Further, in one of the embodiments, in the step of controlling the first driving member 11 corresponding to the installation position of the target rangefinder 20 according to the result difference, the following specific steps are included:

[0111] If the result difference satisfies the following relationship: d1-d2<-e, the driving force of the first driving member 11 corresponding to the installation position of the target rangefinder 20 is controlled to decrease until the detection result of the target rangefinder 20 satisfies the following relationship: -e≤d1-d2≤e;

[0112] If the result difference satisfies the following relationship: d1-d2>e, the driving force of the first driving member 11 corresponding to the installation position of the target rangefinder 20 is controlled to increase until the detection result of the target rangefinder 20 satisfies the following relationship: -e≤d1-d2≤e;

[0113] Wherein, d1 is the detection result of the target rangefinder 20, d2 is the detection result of other rangefinders 20 except the target rangefinder 20, and e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

[0114] Furthermore, in one embodiment, in step S508, the following specific steps are included:

[0115] If the detection result of the rangefinder 20 satisfies the following relationship: d<De, the driving force of the first driving member 11 corresponding to the installation position of the rangefinder 20 is controlled to decrease until the detection result of the rangefinder 20 satisfies the following relationship: De≤d≤D+e;

[0116] If the detection result of the rangefinder 20 satisfies the following relationship: d>D+e, the driving force of the first driving member 11 corresponding to the installation position of the rangefinder 20 is controlled to increase until the detection result of the rangefinder 20 satisfies the following relationship: De≤d≤D+e;

[0117] Wherein, d is the detection result of any distance meter 20, D is the opening and closing size of the mold 90, and e is the allowable thickness deviation of the product, -0.1≤e≤0.1.

[0118] like Figure 8 As shown, in the second page, the controller can control various parameters of the mold opening and foaming process, such as the opening and closing size, the mold opening speed, and then control the hydraulic pressure and flow of the first driving member.

[0119] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0120] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0121] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0122] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0123] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0124] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A multi-process combined injection molding equipment, characterized in that: include: A mold clamping assembly (10), the mold clamping assembly (10) comprising a fixed mold plate (14) and a movable mold plate (15) arranged opposite to each other, a mold (90) being arranged between the fixed mold plate (14) and the movable mold plate (15); a distance meter (20), the distance meter (20) being arranged on the mold (90) and being used for detecting the distance between two mold surfaces of the mold (90); a first injection assembly (30) and a gas injection assembly (40), wherein the first injection assembly (30) is in communication with the gas injection assembly (40), wherein the first injection assembly (30) contains a first component material, wherein the gas injection assembly (40) is used to inject a supercritical fluid into the first component material to form a foaming material, and wherein the first injection assembly (30) is used to inject the foaming material of the product body into the mold (90); A second injection assembly (50), the second injection assembly (50) being used to inject a second component material into the mold (90); A robot arm (60) and an infrared heater (70), wherein the robot arm (60) is used to clamp a thermoplastic organic sheet, and the infrared heater (70) is used to heat the thermoplastic organic sheet.

2. The multi-process combined injection molding equipment according to claim 1, characterized in that: The mold (90) comprises a movable mold (91) and a fixed mold (92); a mold cavity (921) is provided in the fixed mold (92); a retractable first core and a second core are provided in the movable mold (91); when the thermoplastic organic sheet is hot-pressed, the first core extends out to abut against the thermoplastic organic sheet; when the second injection assembly (50) injects a second component material, the second core extends out to form a closed second component molding cavity in the fixed mold (92).

3. The multi-process combined injection molding equipment according to claim 2, characterized in that: The first injection assembly (30) is arranged on a side of the fixed mold plate (14) away from the movable mold plate (15), and a first injection port is provided on the fixed mold plate (14), and the first injection port is communicated with the first injection assembly (30); A second injection port is provided on the side of the fixed mold (92), and the second injection port is connected to the second injection assembly (50).

4. The multi-process combined injection molding equipment according to claim 1, characterized in that: A plurality of first driving members (11) are provided on a side of the movable plate (15) away from the fixed plate (14); the distance meter (20) corresponds to the first driving members (11) one by one; the direction in which the fixed plate (14) and the movable plate (15) are relatively arranged is a first direction; and the installation position of the distance meter (20) is arranged colinearly with the installation position of the first driving member (11) along the first direction.

5. The multi-process combined injection molding equipment according to claim 4, characterized in that: The injection molding device further comprises a controller (80), wherein the controller (80) is electrically connected to the first driving member (11) and the distance meter (20) respectively, and is used for controlling the first driving member (11) at a corresponding position according to a detection result of the distance meter (20).

6. The multi-process combined injection molding equipment according to claim 5, characterized in that: A plurality of second driving members (12) are provided on one side of the movable platen (15) close to the fixed platen (14), and the controller (80) is connected to the second driving members (12) for controlling the opening and closing of the second driving members (12).

7. The multi-process combined injection molding equipment according to claim 1, characterized in that: The first injection assembly (30) includes an injection barrel (34) and an injection screw (35) inserted into the injection barrel (34); the injection barrel (34) is provided with an injection port (31) and a locking nozzle (32); the injection port (31) is connected to the injection assembly (40); when the first component material is plasticized in the injection barrel (34), the locking nozzle (32) opens and is connected to the cavity (921) in the mold (90).

8. The multi-process combined injection molding equipment according to claim 1, characterized in that: The mold clamping assembly (10) further comprises an intermediate mold plate (18), wherein the intermediate mold plate (18) is located between the fixed mold plate (14) and the movable mold plate (15), wherein the movable mold plate (15) and the fixed mold plate (14) are respectively provided with a first mold and a second mold, and wherein a third mold and a fourth mold are respectively provided on both sides of the intermediate mold plate (18), and wherein the intermediate mold plate (18) is capable of rotating around a vertical axis, so that the mold clamping assembly (10) has a first mold clamping state and a second mold clamping state; In the first mold-closing state, the first mold is molded with the third mold, and the second mold is molded with the fourth mold; in the second mold-closing state, the first mold is molded with the fourth mold, and the second mold is molded with the third mold.

9. The multi-process combined injection molding equipment according to claim 8, characterized in that: The fixed mold plate (14) is provided with a first injection port, and the movable mold plate (15) is provided with a second injection port. The first injection port is connected to the first injection assembly (30), and the second injection port is connected to the second injection assembly (50).

10. A multi-process combined injection molding method, applicable to the injection molding equipment according to any one of claims 1 to 9, characterized in that: The specific steps include: A mechanical arm (60) is used to clamp the thermoplastic organic sheet, and the sheet is placed in an infrared heater (70) for heating for a certain period of time; A robot (60) is used to clamp the thermoplastic organic sheet from the infrared heater (70) and place it in a mold (90); Using a mold clamping assembly (10) to clamp and hot-press the thermoplastic organic sheet, so that the thermoplastic organic sheet is cooled and formed; A second injection assembly (50) is used to inject a second component material into the mold (90) to form a modified portion on the thermoplastic organic sheet and cool the formed portion; A gas injection component (40) is used to inject a supercritical fluid into a first injection component (30), a first component material forms a foaming material in the first injection component (30), the first injection component (30) injects the foaming material into a mold (90), a mold clamping component (10) is used to drive the mold (91) to open the mold for foaming, and a main body portion is formed on the thermoplastic organic sheet and the modified portion.

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