A method for determining the fixing screw of the semi-circular pressure ring of an injection molding machine and its screw.

Abstract

This invention discloses a method for determining the fixing screw of an injection molding machine and its screw semi-circular pressure ring. The method includes: acquiring the melting torque of the injection molding machine during the melting process; determining the extraction force of the injection molding machine based on the melting torque; and determining the specifications of the fixing screw of the screw semi-circular pressure ring based on the extraction force. Since the extraction force determined based on the melting torque is not less than the actual extraction force, the fixing screw specifications determined using the method of this invention are not prone to breakage even during extraction operations.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and more specifically to a method for determining the fixing screw of the semi-circular pressure ring of an injection molding machine and its screw. Background Technology

[0002] Currently, the specifications of the fixing screws for the screw's semi-circular pressure ring are determined based on the injection pressure; for example, the force on the fixing screw is approximately 20% of the injection pressure. However, different materials require different injection pressures, and even with the same material, variations in product flowability necessitate different injection pressures. Therefore, determining the fixing screw specifications based solely on injection pressure is not entirely reasonable. In fact, when the molding process involves a suction action, the fixing screws for the screw's semi-circular pressure ring frequently break. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a method for determining the fixing screw of the screw semicircular pressure ring of an injection molding machine, so as to solve the problem of breakage of the fixing screw of the screw semicircular pressure ring in the injection molding machine.

[0004] According to a first aspect, embodiments of the present invention provide a method for determining the fixing screw of the screw semicircular pressure ring in an injection molding machine, comprising the following steps: during the melting process of the injection molding machine, obtaining the melting torque of the injection molding machine; determining the extraction force of the injection molding machine based on the melting torque; and determining the specification of the fixing screw of the screw semicircular pressure ring based on the extraction force.

[0005] The method for determining the fixing screw of the screw semicircular pressure ring in an injection molding machine provided by this invention involves obtaining the melting torque of the injection molding machine, determining the extraction force of the injection molding machine based on the melting torque, and further determining the specifications of the fixing screw of the screw semicircular pressure ring based on the extraction force. Since the extraction force determined based on the melting torque is not less than the actual extraction force, the specifications of the fixing screw determined by the method of this invention are not easily broken even during extraction.

[0006] Specifically, determining the extraction force of the injection molding machine based on the melt torque includes: obtaining the screw size of the screw in the injection molding machine; and determining the extraction force of the injection molding machine based on the melt torque and the screw size.

[0007] Specifically, the screw dimension is the radius or the diameter of the screw.

[0008] Specifically, determining the suction force of the injection molding machine based on the melt torque and the screw size includes: determining the suction force of the injection molding machine using a preset first formula based on the melt torque and the screw size; the first formula is: F = T / r; where F represents the suction force of the injection molding machine, T represents the melt torque, and r represents the radius of the screw.

[0009] Specifically, obtaining the screw size of the screw in the injection molding machine includes: obtaining multiple screw sizes belonging to multiple specifications of the injection molding machine; and selecting the smallest screw size among the multiple screw sizes.

[0010] Specifically, obtaining the melt torque of the injection molding machine includes: during the melting process, obtaining the motor parameters of the melt motor of the injection molding machine; and determining the melt torque based on the motor parameters of the melt motor.

[0011] According to a second aspect, embodiments of the present invention also provide a device for determining the fixing screw of the screw semicircular pressure ring in an injection molding machine, comprising an acquisition module, a first processing module, and a second processing module: during the melting process of the injection molding machine, the acquisition module is used to acquire the melting torque of the injection molding machine; the first processing module is used to determine the extraction force of the injection molding machine based on the melting torque; and the second processing module is used to determine the specifications of the fixing screw of the screw semicircular pressure ring based on the extraction force.

[0012] According to a third aspect, embodiments of the present invention also provide an electronic device, including a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method for determining the fixing screw of the screw semicircular pressure ring in an injection molding machine as described in the first aspect or any embodiment of the first aspect.

[0013] According to the fourth aspect, the present invention also provides an injection molding machine, including a melt motor, a motor parameter acquisition module, and the electronic device described in the third aspect. During the melt process of the injection molding machine, the motor parameter acquisition module is used to acquire the motor parameters of the melt motor; the electronic device is communicatively connected to the motor parameter acquisition module.

[0014] According to a fifth aspect, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing the computer to execute the method for determining the fixing screw of the screw semicircular pressure ring in an injection molding machine as described in the first aspect or any embodiment of the first aspect. Attached Figure Description

[0015] The features and advantages of the invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way. In the drawings:

[0016] Figure 1 This is a flowchart illustrating the method for determining the fixing screw of the semi-circular pressure ring of the screw in an injection molding machine according to Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the injection molding machine.

[0018] Figure 3 This is a cross-sectional view of an injection molding machine;

[0019] Figure 4 This is an enlarged view of the semi-circular pressure ring of the screw in an injection molding machine;

[0020] Figure 5 This is a schematic diagram of the injection molding machine's working process;

[0021] Figure 6 This is a schematic diagram of the device for determining the fixing screw of the screw semi-circular pressure ring in the injection molding machine according to Embodiment 2 of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of the electronic device in Embodiment 3 of the present invention;

[0023] The components are: 1. Screw semi-circular pressure ring; 2. Fixing screw; 3. Melting motor; 4. Pressure sensor; 5. Injection motor; 6. Molding cavity; 7. Melt; 8. Screw; 9. Feed port; 10. Screw head; 11. Injection screw; 12. Material tube. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0026] Example 1

[0027] Embodiment 1 of the present invention provides a method for determining the fixing screw of the semi-circular pressure ring of the screw in an injection molding machine. Figure 1 This is a flowchart illustrating the method for determining the fixing screw of the semi-circular pressure ring of the screw in an injection molding machine according to Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the injection molding machine. Figure 3 This is a cross-sectional view of an injection molding machine. Figure 4 This is an enlarged view of the semi-circular pressure ring of the screw in an injection molding machine; Figure 5 This is a schematic diagram of the working process of an injection molding machine.

[0028] like Figures 2-5 As shown, during the melting process, the melting motor 3 drives the screw 8 to rotate to realize the material conveying and, under the combined action of the external heating system, the material becomes molten body 7 and accumulates in the material tube 12 cavity in front of the screw head 10. That is, during the melting process after the material is added at the feeding port 9, the material added at the feeding port 9 moves to the left and accumulates at the screw head 10.

[0029] During the injection process, the melting motor 3 remains stationary, while the injection motor 5 drives the injection screw 11 to rotate, causing the screw 8 to advance. This allows the molten material 7 at the screw head 10 to enter the molding cavity 6 at a specific speed and pressure. The melt pressure during this process is detected by the pressure sensor 4 and fed back to the control system. The control system compares the received signal with the set pressure and makes a judgment to maintain or change the rotational speed of the injection screw 11, thereby ensuring that the melt maintains appropriate pressure throughout the process.

[0030] After the melting process is complete, due to the back pressure, the molten material 7 at the front end of the screw 8 has a certain pressure. At this time, a suction (retraction) action is needed to relieve the residual pressure of the molten material 7 at the front end of the screw 8. Otherwise, the molten material 7 will flow into the mold sprue through the nozzle orifice, forming cold material. When it is injected again, this cold material will affect the product quality. However, the suction distance should not be too large, otherwise the front end of the screw 7 will suck in air. If too much air is sucked in, defects such as silver streaks and air marks will appear on the product surface when it is injected again. In severe cases, it may even cause burning.

[0031] That is, the melt 7 at the screw head 10 has a force that causes the moving part of the injection molding machine to retract. This force is detected by the pressure sensor 4 installed between the screw 8 and the injection screw 11 and fed back to the control system. Based on the received signal, the control system controls the rotation speed of the injection screw 11 through the injection motor 5, so that the pressure of the melt 7 at the screw head 10 is within the required value and retracts until the set position is reached.

[0032] In other words, after the melting process ends and before the injection begins, the process of retracting the screw 8 by rotating the injection screw 11 is the suction process. Specifically, at the end of the melting process, the melting motor 3 remains stationary, while the injection motor 5 continues to move, causing the screw 8 to retract. The force that resists the retraction of the screw 8 is the suction force. Specifically, the suction force is the resultant force of the friction between the plastic particles and the screw, the adhesive force between the molten plastic and the screw, etc.

[0033] Based on this, such as Figure 1 As shown, the method for determining the fixing screw of the screw semicircular pressure ring 1 in the injection molding unit of Embodiment 1 of the present invention includes the following steps:

[0034] S101: During the melting process of the injection molding unit, the melting torque of the injection molding unit is obtained.

[0035] Specifically, obtaining the melt torque of the injection molding unit includes: during the melting process, obtaining the motor parameters of the melt motor of the injection molding unit; and determining the melt torque based on the motor parameters of the melt motor and the transmission ratio between the melt motor and the screw.

[0036] Specifically, the motor parameters of a melt glue motor include the current and the torque constant. The current of the melt glue motor is the current flowing during the melt glue melting process.

[0037] Specifically, the following scheme can be adopted to determine the melt torque based on the motor parameters of the melt motor and the transmission ratio between the melt motor and the screw: the motor torque of the melt motor is obtained based on the current and torque constant of the melt motor; the melt torque is obtained based on the motor torque of the melt motor and the transmission ratio of the belt drive between the melt motor and the screw.

[0038] For example, based on the current and torque constant of the melt glue motor, the motor torque of the melt glue motor is obtained using the first formula, where the first formula is M = K. t *I, M represent the motor torque of the melt glue motor, K t I represents the torque constant of the melt glue motor, and I represents the current of the melt glue motor.

[0039] Based on the motor torque of the melt glue motor and the transmission ratio of the belt drive between the melt glue motor and the screw, the melt glue torque is obtained using the second formula, where the second formula is: T=M*i, where T represents the melt glue torque, M represents the motor torque of the melt glue motor, and i represents the transmission ratio of the belt drive between the melt glue motor and the screw.

[0040] S102: Determine the extraction force of the injection unit based on the melt torque.

[0041] Specifically, determining the extraction force of the injection molding unit based on the melt torque includes: obtaining the screw size of the screw in the injection molding unit; and determining the extraction force of the injection molding unit based on the melt torque and the screw size.

[0042] Wherein, the screw dimension is the radius of the screw or the diameter of the screw.

[0043] More specifically, the suction force of the injection molding unit is determined using a preset first formula based on the melt torque and the screw size; the first formula is: F = T / r; where F represents the suction force of the injection molding unit, T represents the melt torque, and r represents the radius of the screw.

[0044] Furthermore, obtaining the screw size of the screw in the injection molding unit includes: obtaining multiple screw sizes belonging to multiple specifications of the injection molding unit; and selecting the smallest screw size among the multiple screw sizes.

[0045] For example, a certain injection molding unit includes three screw diameters: 55mm, 60mm, and 70mm, all with a screw torque of 1850Nm. Using the smallest screw diameter for calculation, and applying the first formula mentioned above, the extraction force is 1850 / 0.0275 = 67273N.

[0046] S103: Determine the specifications of the fixing screws of the screw semicircular pressure ring 1 based on the suction force.

[0047] For example, the specifications of the fixing screws for the semi-circular pressure ring 1 of the screw can be determined based on the contents of the mechanical design manual and the force of the glue extraction, which will not be elaborated here.

[0048] It should be noted that the forces that the melting torque needs to overcome include: the frictional force between the plastic granules and the screw, the adhesive force between the molten plastic and the screw, and the plastic conveying force. The force on screw 8 can be equivalent to a tangential force F on screw 8, then F = T / r. The frictional force between the plastic granules and the screw, and the adhesive force between the molten plastic and the screw, are in the opposite direction to the direction of motion. Taking F as the suction force, since the melting motor 3 stops rotating during suction, there is no plastic conveying force. Therefore, the calculated value of F will not be less than the actual suction force. Thus, selecting screws based on this is safe.

[0049] In summary, the method for determining the fixing screw of the screw semicircular pressure ring in the injection molding unit provided in Embodiment 1 of the present invention obtains the melting torque of the injection molding unit, determines the extraction force of the injection molding unit based on the melting torque, and further determines the specifications of the fixing screw of the screw semicircular pressure ring based on the extraction force. Since the extraction force determined based on the melting torque is not less than the actual extraction force, the specifications of the fixing screw determined by the method of the present invention are not easily broken even when there is an extraction action, thus improving the reliability of the fixing screw.

[0050] Example 2

[0051] Corresponding to Embodiment 1 of the present invention, Embodiment 2 of the present invention provides a device for determining the fixing screw of the semi-circular pressure ring of the screw in an injection molding machine, such as... Figure 6 As shown, the device for determining the fixing screw of the screw semicircular pressure ring in the injection molding machine in Embodiment 2 of the present invention includes an acquisition module 20, a first processing module 21, and a second processing module 22.

[0052] In the process of melting the plastic in the injection molding machine, the acquisition module 20 is used to acquire the melting torque of the injection molding machine.

[0053] The first processing module 21 is used to determine the extraction force of the injection molding machine based on the melt torque;

[0054] The second processing module 22 is used to determine the specifications of the fixing screw of the screw semi-circular pressure ring based on the adhesive extraction force.

[0055] Specifically, the first processing module 21 is used to: obtain the screw size of the screw in the injection molding machine; and determine the extraction force of the injection molding machine based on the melt torque and the screw size. The screw size is either the radius or the diameter of the screw.

[0056] The first processing module 21 is specifically used to: determine the suction force of the injection molding machine according to the melt torque and the screw size using a preset first formula; the first formula is: F = T / r; where F represents the suction force of the injection molding machine, T represents the melt torque, and r represents the radius of the screw.

[0057] The acquisition module 20 is specifically used to: acquire multiple screw sizes belonging to multiple models of the injection molding machine; and select the smallest screw size among the multiple screw sizes.

[0058] The second processing module 22 is specifically used to: acquire the motor parameters of the melting motor of the injection molding machine during the melting process of the injection molding machine; and determine the melting torque based on the motor parameters of the melting motor.

[0059] For details regarding the fixing screw mechanism for the semi-circular pressure ring of the screw in the aforementioned injection molding machine, please refer to the relevant documentation. Figures 1 to 5 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0060] Example 3

[0061] Embodiment 3 of the present invention provides an electronic device, such as... Figure 7 As shown, the electronic device may include a processor 31 and a memory 32, wherein the processor 31 and the memory 32 may be connected by a bus or other means.

[0062] Based on the aforementioned electronic device, Embodiment 3 of the present invention also provides an injection molding machine, which includes a melt motor, a motor parameter acquisition module, and the aforementioned electronic device. During the melt molding process of the injection molding machine, the motor parameter acquisition module is used to acquire the motor parameters of the melt motor; the electronic device is communicatively connected to the motor parameter acquisition module. The processor 31 can be a Central Processing Unit (CPU). The processor 31 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the aforementioned types of chips.

[0063] Memory 32, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the method for determining the fixing screw of the screw semi-circular pressure ring in the injection molding machine in Embodiment 1 of the present invention (e.g., Figure 6 The acquisition module 20, the first processing module 21, and the second processing module 22 are shown. The processor 31 executes various functional applications and data processing by running non-transitory software programs, instructions, and modules stored in the memory 32, thereby realizing the method for determining the fixing screw of the screw semi-circular pressure ring in the injection molding machine in the above method embodiment.

[0064] The memory 32 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 31, etc. Furthermore, the memory 32 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 32 may optionally include memory remotely located relative to the processor 31, and these remote memories may be connected to the processor 31 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0065] The one or more modules are stored in the memory 32, and when executed by the processor 31, they perform actions such as... Figures 1 to 5 The method for determining the fixing screw of the screw semi-circular pressure ring in the injection molding machine in the illustrated embodiment.

[0066] For specific details regarding the aforementioned electronic equipment and injection molding machines, please refer to the relevant references. Figures 1 to 5 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0067] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0068] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for determining the fixing screw of the semi-circular pressure ring of the screw in an injection molding machine, characterized in that, include: During the melting process of the injection molding machine, the melting torque of the injection molding machine is obtained; The extraction force of the injection molding machine is determined based on the melt torque; The specifications of the fixing screws for the semi-circular pressure ring of the screw are determined based on the suction force. The step of determining the extraction force of the injection molding machine based on the melt torque includes: Obtain the screw size of the screw in the injection molding machine, wherein the screw size is the radius or the diameter of the screw; The extraction force of the injection molding machine is determined based on the melt torque and the screw size; The step of determining the extraction force of the injection molding machine based on the melt torque and the screw size includes: The extraction force of the injection molding machine is determined using a preset first formula based on the melt torque and the screw size. The first formula is: F= ; Wherein, F represents the suction force of the injection molding machine, T represents the melting torque, and r represents the radius of the screw.

2. The method according to claim 1, characterized in that, The process of obtaining the screw dimensions of the injection molding machine includes: Obtain multiple screw dimensions belonging to multiple specifications of the injection molding machine; Select the smallest screw size from the plurality of screw sizes.

3. The method according to claim 1, characterized in that, The process of obtaining the melt torque of the injection molding machine includes: During the melting process of the injection molding machine, the motor parameters of the melting motor of the injection molding machine are obtained; The melting torque is determined based on the motor parameters of the melting motor.

4. A device for determining the fixing screw of the semi-circular pressure ring of a screw in an injection molding machine, characterized in that, It includes an acquisition module, a first processing module, and a second processing module: During the melting process of the injection molding machine, the acquisition module is used to acquire the melting torque of the injection molding machine; The first processing module is used to determine the extraction force of the injection molding machine based on the melt torque; The second processing module is used to determine the specifications of the fixing screw of the screw semi-circular pressure ring based on the adhesive extraction force; The first processing module is specifically used to: obtain the screw size of the screw in the injection molding machine, wherein the screw size is the radius or the diameter of the screw; The extraction force of the injection molding machine is determined based on the melt torque and the screw size; The step of determining the extraction force of the injection molding machine based on the melt torque and the screw size includes: The extraction force of the injection molding machine is determined using a preset first formula based on the melt torque and the screw size. The first formula is: F= ; Wherein, F represents the suction force of the injection molding machine, T represents the melting torque, and r represents the radius of the screw.

5. An electronic device, characterized in that, include: A memory and a processor are interconnected, the memory storing computer instructions, and the processor executing the computer instructions to perform the method for determining the fixing screw of the screw semicircular pressure ring in the injection molding machine according to any one of claims 1 to 3.

6. An injection molding machine, characterized in that, include: Melt glue motor; The motor parameter acquisition module is used to acquire the motor parameters of the melting motor during the injection molding process. The electronic device of claim 5 is communicatively connected to the motor parameter acquisition module.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the method for determining the fixing screw of the screw semicircular pressure ring in the injection molding machine as described in any one of 1 to 3.

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