Injection molding control method, system, injection molding machine, computer device and storage medium

Abstract

The application provides an injection molding control method, system, injection molding machine, computer equipment and storage medium, relates to the injection molding processing technical field, and the injection molding control method provided by the application carries out pre-pressurization through starting a liquid pump, and opens an electromagnetic valve, when the injection oil cylinder meets the initial injection condition, the liquid pump is controlled to operate according to the preset power, the position, speed and moving time of the injection propelling element in the injection oil cylinder can be used as the judgment basis of the initial injection condition, the state of the electromagnetic valve and the injection oil cylinder is ensured to meet the needs of the injection molding working condition, and the liquid pump is controlled to operate according to the preset power only when the injection oil cylinder meets the initial injection condition, the injection initial stage can be avoided to generate the injection phenomenon, and the stability of the injection process is improved.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an injection molding control method, system, injection molding machine, computer equipment, and storage medium. Background Technology

[0002] See Figure 1 When the injection molding machine performs the injection action, the hydraulic pump 100 and the solenoid valve 200 operate according to control commands. The hydraulic pump 100 delivers hydraulic oil to the injection cylinder 300 via the solenoid valve 200, where it is converted into mechanical energy and drives the injection molding material to be sprayed out. When both the hydraulic pump 100 and the solenoid valve 200 receive control commands simultaneously, the response speed of the hydraulic pump 100 is faster than that of the solenoid valve 200. Therefore, the solenoid valve 200 may not open until the hydraulic pump 100 starts and pressurizes for a period of time. At the beginning of injection, the high hydraulic pressure can cause the injection molding material to spray out, affecting the stability of the injection molding process and easily causing flow marks and defects on the surface of the injection molded parts. Summary of the Invention

[0003] The purpose of this invention is to provide an injection molding control method, system, injection molding machine, computer equipment, and storage medium to alleviate the technical problem of injection material ejection at the start of injection molding.

[0004] In a first aspect, the injection molding control method provided by the present invention is applicable to an injection molding machine, the injection molding machine comprising: a liquid pump, a solenoid valve, and an injection cylinder, wherein the liquid pump pressurizes liquid and flows through the solenoid valve into the injection cylinder, and the injection cylinder drives the injection of molding material; the injection molding control method includes the following steps:

[0005] Start the liquid pump to pre-pressurize and open the solenoid valve;

[0006] When the injection cylinder meets the initial injection conditions, the liquid pump is controlled to operate according to the preset power.

[0007] In conjunction with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein the initial injection conditions include: the injection propulsion element of the injection cylinder is propelled to a preset position.

[0008] In conjunction with the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the initial injection conditions include: the injection propulsion element of the injection cylinder moving at a preset speed.

[0009] In conjunction with the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the initial injection conditions include: the duration of the propulsion motion of the injection propulsion element of the injection cylinder is greater than or equal to a preset time.

[0010] In conjunction with the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the step of activating the liquid pump for pre-pressurization includes:

[0011] Start the liquid pump until the pressure at the inlet of the solenoid valve reaches the preset pressure.

[0012] In conjunction with the fourth possible implementation of the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein, in the step of starting the liquid pump for pre-pressurization, the liquid pump operates at a pre-pressurization power, which is less than the preset power.

[0013] Secondly, the injection molding control system provided by the present invention includes:

[0014] The detection module is used to detect the working status of the injection cylinder;

[0015] A control module is connected to the detection module, the liquid pump, and the solenoid valve;

[0016] The control module is used to control the start of the liquid pump and open the solenoid valve. When the injection cylinder meets the initial injection conditions, the liquid pump is made to run at a preset power.

[0017] Thirdly, the injection molding machine provided by the present invention includes a unit for performing the injection control method as described in the first aspect.

[0018] Fourthly, the computer device provided by the present invention includes: a memory and a controller, wherein the memory stores a computer program, and the controller executes the computer program to implement the injection molding control method described in the first aspect.

[0019] Fifthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the injection molding control method described in the first aspect.

[0020] The embodiments of the present invention bring the following beneficial effects: by starting the liquid pump for pre-pressurization and opening the solenoid valve, when the injection cylinder meets the initial injection conditions, the liquid pump is controlled to run according to the preset power. During the pre-pressurization stage, the flow rate and pressure delivered by the liquid pump are sufficient to provide a certain hydraulic pressure in the flow path. The liquid pump is controlled to run according to the preset power only when the injection cylinder meets the initial injection conditions, which can avoid the jetting phenomenon in the early stage of injection and improve the stability of the injection process.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the hydraulic circuit of an injection molding machine provided in an embodiment of the present invention;

[0024] Figure 2 This is a flowchart of the injection molding control method provided in an embodiment of the present invention.

[0025] Icons: 100 - Liquid pump; 200 - Solenoid valve; 300 - Injection cylinder. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only to describe differences in name and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities in the International System of Units (SI), or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figure 1 and Figure 2 As shown, the injection molding control method provided in this embodiment of the invention is applicable to an injection molding machine. The injection molding machine includes: a liquid pump 100, a solenoid valve 200, and an injection cylinder 300. The liquid pump 100 pressurizes the oil and flows through the solenoid valve 200 into the injection cylinder 300. The injection cylinder 300 drives the injection molding material to be sprayed.

[0030] The injection molding control method includes the following steps: starting the liquid pump 100 for pre-pressurization and opening the solenoid valve 200; when the injection cylinder 300 meets the initial injection conditions, controlling the liquid pump 100 to run according to the preset power.

[0031] In the initial stage, the liquid pump 100 is started for pre-pressurization, thereby injecting a small flow rate into the flow path and bringing the flow path to a certain pressure state to meet the pressure requirement for the solenoid valve 200 to switch to the open state and open its valve core. During the pre-pressurization stage, the start-up time or average power of the liquid pump 100 is adjusted to avoid excessive fluid pressure in the flow path. The liquid pump 100 is controlled according to the state of the injection cylinder 300. When the injection cylinder 300 meets the initial injection conditions, the liquid pump 100 is controlled to operate according to the preset power. In other words, after the pre-pressurization is completed, it immediately enters a specific injection pressure and flow rate condition, ensuring the continuity of injection molding control and avoiding technical problems such as injection material ejection and flow marks on the surface of the injection molded parts in the early stage of injection molding. This helps to improve the stability of the injection molding process and thus ensure the quality of the injection molded parts.

[0032] In one optional embodiment, the initial injection conditions include: the injection propulsion element of the injection cylinder 300 is advanced to a preset position. The position of the injection propulsion element of the injection cylinder 300 is detected to determine the opening state of the solenoid valve 200. When the injection propulsion element reaches the preset position, it indicates that the solenoid valve 200 is fully open and that the injection cylinder 300 has completed the pre-pressurization of the injection material in the injection nozzle. At this point, the pre-pressurization ends, and the hydraulic pump 100 is controlled to operate according to the preset power, allowing for a smooth transition to the specific injection molding process stage.

[0033] In another embodiment, the initial injection conditions include: the injection propulsion element of the injection cylinder 300 reaching a preset speed. Based on the speed of the injection propulsion element, when the preset speed is reached, it indicates that the hydraulic pressure in the flow path has reached a certain level, the injection cylinder 300 has injected a certain amount of fluid, and the solenoid valve 200 is fully open. At this point, pre-pressurization ends, and the pump 100 is controlled to operate according to the preset power, thus smoothly entering the specific injection molding process stage.

[0034] In another optional embodiment, the initial injection conditions include: the duration of the propulsion movement of the injection propulsion element in the injection cylinder 300 is greater than or equal to a preset time. The required duration of the pre-pressurization stage can be determined experimentally. While ensuring no ejection occurs during the initial injection molding process, this duration is used as the upper limit of the pre-pressurization duration (preset time). Once the preset time is reached, pre-pressurization ends, and the pump 100 operates according to a preset power control. The duration of the propulsion movement of the injection propulsion element being greater than or equal to the preset time can be used as a remedial condition for the position and speed conditions of the injection propulsion element. Regardless of whether the position and speed of the injection propulsion element meet the initial injection conditions, as long as the duration of the propulsion movement of the injection propulsion element reaches the preset time, pre-pressurization ends, and the pump 100 operates according to the preset power control.

[0035] It should be noted that, in an optional embodiment, the opening state of the solenoid valve 200 can also be used as the basis for determining the initial injection conditions; that is, if the solenoid valve 200 is fully open, the initial injection conditions are met. Obviously, the opening degree of the solenoid valve 200 is difficult to detect, and the opening state of the solenoid valve 200 cannot characterize the working state of the injection cylinder 300. Using the position, speed, and movement time of the injection propulsion element in the injection cylinder 300 as the basis for determining the initial injection conditions can ensure that the states of both the solenoid valve 200 and the injection cylinder 300 meet the requirements of the injection molding process.

[0036] In this embodiment, the pre-pressurization step of the liquid pump 100 includes: starting the liquid pump 100 until the pressure at the inlet end of the solenoid valve 200 reaches a preset pressure. The preset pressure is approximately equal to the minimum pressure required to open the valve core of the solenoid valve 200. This pressure value can be detected at the inlet end of the solenoid valve 200 or at the inlet end of the injection cylinder 300. When the solenoid valve 200 is open, the pressure at the inlet end of the solenoid valve 200 is approximately equal to the pressure at the inlet end of the injection cylinder 300.

[0037] In this embodiment, during the pre-pressurization step of starting the liquid pump 100, the liquid pump 100 operates at a pre-pressurization power, which is less than a preset power. The liquid pump 100 uses a servo motor as its power source, and its power is controlled by adjusting the servo motor's speed. The servo motor can be controlled via pulse width modulation, thereby regulating the output power of the liquid pump 100. During the pre-pressurization phase, the liquid pump 100 operates at a lower pre-pressurization power; after pre-pressurization, it operates at the preset power, thereby driving the injection cylinder 300 according to a specific injection pressure and flow rate.

[0038] Specifically, taking the solenoid valve 200 commonly used in injection molding machines as an example, its response time is typically 80ms to 130ms. The preset duration corresponding to the duration of the injection propulsion element's propulsion movement can be slightly longer than this response time by 5ms to 30ms, and can be set to 150ms. When the injection cylinder 300 is stationary, the position of the injection propulsion element may fluctuate within 0.1mm. Therefore, the preset position of the injection propulsion element can be set at its initial position of 0.2mm. Typically, after the solenoid valve 200 is opened, the speed of the injection propulsion element is 2mm / s to 3mm / s. Under initial injection conditions, the preset speed corresponding to the movement speed of the injection propulsion element can be slightly larger, set to 5mm / s.

[0039] The injection molding control system provided in this embodiment of the invention includes a detection module and a control module. The detection module is used to detect the working state of the injection cylinder 300. The detection module includes a position sensor or a speed sensor to detect the injection propulsion element of the injection cylinder 300. The control module is connected to the detection module, the liquid pump 100, and the solenoid valve 200. The control module is used to control the start of the liquid pump 100 and open the solenoid valve 200. When the injection cylinder 300 meets the initial injection conditions, the liquid pump 100 operates at a preset power. A timer can also be added to time the movement time of the injection propulsion element. When the preset time is reached, it is considered that the initial injection conditions are met, the pre-pressurization ends, and the liquid pump 100 is controlled to run at the preset power.

[0040] The injection molding machine provided in this embodiment of the invention includes a unit for executing the injection control method described in the above embodiments. The injection molding machine has the beneficial effects of the above injection control method, which will not be repeated here.

[0041] Furthermore, the injection molding control method described in the above embodiments can also be presented via computer equipment or computer-readable storage media.

[0042] In a feasible implementation, the computer device includes a memory and a controller, the memory storing a computer program, and the controller executing the computer program to implement the injection molding control method as described in the above embodiments.

[0043] The computer device also includes an input / output interface, a communication interface, a display unit, and an input device. The controller, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The controller provides computing and control capabilities. It includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements the aforementioned injection molding control method.

[0044] In feasible implementations, a computer-readable storage medium stores a computer program thereon, which, when executed, implements the injection molding control method described in the above embodiments. Any references to memory, databases, or other media used in the embodiments may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase-change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the various embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding control method, applicable to an injection molding machine, the injection molding machine comprising: The system includes a hydraulic pump (100), a solenoid valve (200), and an injection cylinder (300), wherein the hydraulic pump (100) pressurizes the hydraulic fluid and flows through the solenoid valve (200) into the injection cylinder (300), and the injection cylinder (300) drives the injection molding material to be sprayed. Its characteristic is that it includes the following steps: The liquid pump (100) is started to pre-pressurize the flow path to a certain pressure state, so as to meet the pressure requirement of the solenoid valve (200) to switch to the open state and open its valve core, and the solenoid valve (200) is opened. After the pre-pressurization is completed, when the injection cylinder (300) meets the initial injection conditions, the liquid pump (100) is controlled to run according to the preset power, and then enters the injection molding condition with specific injection pressure and flow rate.

2. The injection molding control method according to claim 1, characterized in that, The initial injection conditions include: the injection propulsion element of the injection cylinder (300) is propelled to a preset position.

3. The injection molding control method according to claim 1, characterized in that, The initial injection conditions include: the injection propulsion element of the injection cylinder (300) moves at a preset speed.

4. The injection molding control method according to any one of claims 1-3, characterized in that, The initial injection conditions include: the duration of the propulsion motion of the injection propulsion element of the injection cylinder (300) is greater than or equal to a preset time.

5. The injection molding control method according to claim 1, characterized in that, The step of starting the liquid pump (100) for pre-pressurization includes: Start the liquid pump (100) until the pressure at the inlet of the solenoid valve (200) reaches the preset pressure.

6. The injection molding control method according to claim 5, characterized in that, In the step of starting the liquid pump (100) for pre-pressurization, the liquid pump (100) operates at a pre-pressurization power, which is less than the preset power.

7. An injection molding control system, characterized in that, The injection molding control system includes: The detection module is used to detect the working status of the injection cylinder (300); A control module, which is connected to the detection module, the liquid pump (100) and the solenoid valve (200). The control module is used to control the start of the liquid pump (100) and to open the solenoid valve (200). When the injection cylinder (300) meets the initial injection conditions, the liquid pump (100) is operated at a preset power. In the initial stage, the liquid pump (100) pre-pressurizes the flow path to a certain pressure state to meet the pressure requirement for the solenoid valve (200) to switch to the open state and open its valve core. After pre-pressurization, the injection molding process immediately begins with specific injection pressure and flow rate.

8. An injection molding machine, characterized in that, Includes a unit for performing the injection molding control method as described in any one of claims 1-6.

9. A computer device, comprising: A memory and a controller, wherein the memory stores a computer program, characterized in that the controller, when executing the computer program, implements the injection molding control method according to any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the injection molding control method according to any one of claims 1-6.

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