Quality management method, device, system and equipment for injection molding product and readable medium

Abstract

The invention provides an injection molding product quality management method, device, system and equipment and a readable medium, which are applied to a quality management system. The injection molding product is manufactured by using a mold through at least one injection molding stage; at least one technological parameter of the mold is obtained, and a pressure sensor is installed at at least one position in the mold; based on the parameter values of the technological parameters, a manufacturing experiment of the injection molding product is conducted, and in the manufacturing experiment process, the mold cavity pressure of the mold is collected through a pressure sensor; based on the die cavity pressure of the die, establishing a die cavity pressure mathematical model of the die; determining target parameter values of the process parameters based on the mold cavity pressure mathematical model and preset quality requirements of the injection molding product; and the parameter values of the process parameters in the injection molding stage are adjusted to be the target parameter values, so that the injection molding product manufactured based on the target parameter values meets the preset quality requirement, and a theoretical basis and data support are provided for optimizing the quality of the injection molding product by adjusting the parameter values of the process parameters.

Description

Technical Field

[0001] The present invention relates to the field of injection molding production technology, and in particular to a quality management method for injection molded products, a quality management device for injection molded products, a quality management system for injection molded products, an electronic device and a computer-readable medium. Background Art

[0002] Injection molded products are one of the most widely used plastic products. The injection molding processing method is the most common and widely used plastic product processing method, and the injection molding processing method is completed by molds. In order to improve the quality of injection molded products, it is necessary to adjust the process parameters in the injection molding process and adjust the state data in the mold cavity of the mold during the injection molding process to optimize the quality of the injection molded products. However, since the injection molding process is closed and complex, it is difficult to collect the state data in the mold cavity during the injection molding process in a timely, efficient, accurate and low-cost manner, and it is difficult to adjust the process parameters in the injection molding process based on the state data in the mold cavity, thereby optimizing the quality of the injection molded products. Summary of the invention

[0003] The embodiments of the present invention provide a quality management method, device, system, electronic device and computer-readable storage medium for injection molded products to solve the problem that the injection molding process is closed and complicated, and it is difficult to collect the status data in the mold cavity during the injection molding process in a timely, efficient, accurate and low-cost manner, and it is also difficult to adjust the process parameters in the injection molding process based on the status data in the mold cavity, thereby optimizing the quality of the injection molded products.

[0004] The embodiment of the present invention discloses a quality management method for injection molded products, which is applied to a quality management system for injection molded products; the injection molded products are made by using a preset mold through at least one injection molding stage; the method comprises:

[0005] Acquire at least one process parameter of the mold in the injection molding stage, and install a preset pressure sensor at at least one position in the mold;

[0006] Based on the parameter value of the process parameter, a manufacturing experiment of the injection molded product is performed, and during the manufacturing experiment, the mold cavity pressure of the mold in the at least one injection molding stage is collected by the pressure sensor;

[0007] Establishing a mathematical model of the mold cavity pressure of the mold based on the mold cavity pressure of the mold in the at least one injection molding stage;

[0008] Determining target parameter values ​​of the process parameters based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product;

[0009] The parameter value of the process parameter in the injection molding stage is adjusted to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

[0010] Optionally, the manufacturing experiment of the injection molded product based on the parameter value of the process parameter includes:

[0011] For any of the process parameters, obtaining at least one parameter value of the process parameter;

[0012] Taking any parameter value of the at least one parameter value as a parameter value to be processed;

[0013] Combining the parameter values ​​to be processed of the process parameters to obtain a parameter value combination of the process parameters;

[0014] Based on the parameter value combination of the process parameters, at least one manufacturing experiment of the injection molded product is performed.

[0015] Optionally, during the manufacturing experiment, collecting the mold cavity pressure of the mold in the at least one injection molding stage by the pressure sensor includes:

[0016] For any one of the manufacturing experiments, during the manufacturing experiment, collecting the mold cavity pressure of the at least one injection molding stage;

[0017] The step of establishing a mathematical model of the mold cavity pressure based on the mold cavity pressure of the mold in at least one injection molding stage comprises:

[0018] For any of the injection molding stages, based on the mold cavity pressure corresponding to at least one of the manufacturing experiments, obtaining an average mold cavity pressure of the mold in the injection molding stage;

[0019] Based on the average cavity pressure, a cavity pressure mathematical model of the mold is established.

[0020] Optionally, establishing a mathematical model of the mold cavity pressure of the mold based on the average mold cavity pressure includes:

[0021] Inputting the parameter value combination into a preset pressure prediction model to obtain a predicted cavity pressure of the mold in the injection molding stage;

[0022] Based on the average mold cavity pressure and the predicted mold cavity pressure, determining whether the average mold cavity pressure meets a preset accuracy requirement;

[0023] When the average cavity pressure meets the preset accuracy requirement, a cavity pressure mathematical model of the mold is established based on the average cavity pressure.

[0024] Optionally, determining the target parameter value of the process parameter based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product includes:

[0025] Determining a target cavity pressure of the injection molding stage corresponding to the injection molding product that meets the preset quality requirements based on a preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molding product;

[0026] The target parameter value of the process parameter is determined based on the target cavity pressure in the injection molding stage and the cavity pressure mathematical model.

[0027] Optionally, the pressure sensor collects an electrical signal of the mold cavity pressure; and collecting the mold cavity pressure of the mold in the at least one injection molding stage by the pressure sensor includes:

[0028] Controlling the pressure sensor to send the electrical signal to a preset signal amplifier;

[0029] Controlling the signal amplifier to amplify the electrical signal, and sending the amplified electrical signal to a preset analog-to-digital converter;

[0030] Controlling the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sending the digital signal to a preset host computer;

[0031] The host computer is controlled to analyze the digital signal to obtain the mold cavity pressure.

[0032] Optionally, judging whether the average mold cavity pressure meets a preset accuracy requirement based on the average mold cavity pressure and the predicted mold cavity pressure includes:

[0033] Based on the average mold cavity pressure and the predicted mold cavity pressure, obtaining a difference between the average mold cavity pressure and the predicted mold cavity pressure;

[0034] When the difference between the average cavity pressure and the predicted cavity pressure is less than a preset difference threshold, it is confirmed that the average cavity pressure meets the preset accuracy requirement.

[0035] Optionally, the injection molding stage includes at least one of a pre-plasticization stage, a mold filling start stage, a filling completion stage, a pressure holding and shrinkage compensation stage, and a cooling stage.

[0036] Optionally, the process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

[0037] The embodiment of the present invention further discloses a quality management device for injection molded products, which is applied to a quality management system for injection molded products; the injection molded products are made by using a preset mold through at least one injection molding stage; the device comprises:

[0038] A process parameter acquisition module, used to acquire at least one process parameter of the mold during the injection molding stage, and install a preset pressure sensor at at least one position in the mold;

[0039] an experiment conducting module, for conducting a manufacturing experiment of the injection molded product based on the parameter value of the process parameter, and collecting the mold cavity pressure of the mold in the at least one injection molding stage through the pressure sensor during the manufacturing experiment;

[0040] A model building module, used for building a mathematical model of the mold cavity pressure of the mold based on the mold cavity pressure of the mold in the at least one injection molding stage;

[0041] A target parameter value determination module, used to determine the target parameter value of the process parameter based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product;

[0042] An adjustment module is used to adjust the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

[0043] Optionally, the experiment conducting module includes:

[0044] A parameter value acquisition submodule, used for acquiring at least one parameter value of any of the process parameters;

[0045] The parameter value to be processed is used as a submodule, and is used to take any parameter value of the at least one parameter value as the parameter value to be processed;

[0046] A combination submodule, used for combining the to-be-processed parameter values ​​of the process parameters to obtain a parameter value combination of the process parameters;

[0047] The experiment conducting submodule is used to conduct at least one manufacturing experiment of the injection molded product based on the parameter value combination of the process parameters.

[0048] Optionally, the experiment conducting module includes:

[0049] A mold cavity pressure collection submodule, for collecting the mold cavity pressure of at least one injection molding stage during any one of the manufacturing experiments;

[0050] The model building module includes:

[0051] An average mold cavity pressure acquisition submodule, used for acquiring, for any of the injection molding stages, an average mold cavity pressure of the mold in the injection molding stage based on the mold cavity pressure corresponding to at least one of the manufacturing experiments;

[0052] The model building submodule is used to build a mathematical model of the mold cavity pressure of the mold based on the average mold cavity pressure.

[0053] Optionally, the model building submodule includes:

[0054] An input unit, used for inputting the parameter value combination into a preset pressure prediction model to obtain a predicted cavity pressure of the mold in the injection molding stage;

[0055] A judging unit, configured to judge whether the average cavity pressure meets a preset accuracy requirement based on the average cavity pressure and the predicted cavity pressure;

[0056] An establishing unit is used to establish the cavity pressure mathematical model of the mold based on the average cavity pressure when the average cavity pressure meets the preset accuracy requirement.

[0057] Optionally, the target parameter value determination module includes:

[0058] a target cavity pressure determination submodule, configured to determine a target cavity pressure of the injection molding stage corresponding to the injection molding product that meets the preset quality requirements based on a preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molding product;

[0059] The target parameter value determination submodule is used to determine the target parameter value of the process parameter based on the target cavity pressure and the cavity pressure mathematical model in the injection molding stage.

[0060] Optionally, the pressure sensor collects an electrical signal of the mold cavity pressure; and the experiment module includes:

[0061] A sending submodule, used for controlling the pressure sensor to send the electrical signal to a preset signal amplifier;

[0062] an amplification submodule, used for controlling the signal amplifier to amplify the electrical signal, and sending the amplified electrical signal to a preset analog-to-digital converter;

[0063] A conversion submodule, used for controlling the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sending the digital signal to a preset host computer;

[0064] The analysis submodule is used to control the host computer to analyze the digital signal to obtain the mold cavity pressure.

[0065] Optionally, the judging unit includes:

[0066] a difference acquisition subunit, configured to acquire a difference between the average cavity pressure and the predicted cavity pressure based on the average cavity pressure and the predicted cavity pressure;

[0067] The confirmation subunit is used to confirm that the average mold cavity pressure meets the preset accuracy requirement when the difference between the average mold cavity pressure and the predicted mold cavity pressure is less than a preset difference threshold.

[0068] Optionally, the injection molding stage includes at least one of a pre-plasticization stage, a mold filling start stage, a filling completion stage, a pressure holding and shrinkage compensation stage, and a cooling stage.

[0069] Optionally, the process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

[0070] The embodiment of the present invention also discloses a quality management system for injection molded products, including:

[0071] A basic information management module, used to obtain process parameters of a mold used to make a preset injection molded product in at least one injection molding stage of the injection molded product;

[0072] A production process monitoring module, used for installing a preset pressure sensor at at least one position in the mold;

[0073] A production process monitoring module, configured to perform a manufacturing experiment of the injection molded product based on a parameter value of at least one of the process parameters, and to collect the mold cavity pressure of the mold in the at least one injection molding stage through the pressure sensor during the manufacturing experiment;

[0074] A scientific mold trial module, used for establishing a mold cavity pressure mathematical model of the mold based on the mold cavity pressure of the mold in at least one injection molding stage;

[0075] A production process monitoring module, used for determining target parameter values ​​of the process parameters based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product;

[0076] A production process monitoring module is used to adjust the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

[0077] Optionally, the basic information management module is used to obtain at least one parameter value of any of the process parameters;

[0078] The basic information management module is used to use any parameter value of the at least one parameter value as a parameter value to be processed;

[0079] The basic information management module is used to combine the to-be-processed parameter values ​​of the process parameters to obtain a parameter value combination of the process parameters;

[0080] The production process monitoring module is used to perform at least one manufacturing experiment of the injection molded product based on the parameter value combination of the process parameters.

[0081] Optionally, the production process monitoring module is used to collect the mold cavity pressure of at least one injection molding stage during any one of the manufacturing experiments;

[0082] The scientific mold trial module is used to obtain the average mold cavity pressure of the mold in the injection molding stage based on the mold cavity pressure corresponding to at least one of the manufacturing experiments for any of the injection molding stages;

[0083] The scientific mold trial module is used to establish a mold cavity pressure mathematical model of the mold based on the average mold cavity pressure.

[0084] Optionally, the scientific mold trial module is used to input the parameter value combination into a preset pressure prediction model to obtain the predicted mold cavity pressure of the mold in the injection molding stage;

[0085] The scientific mold trial module is used to determine whether the average mold cavity pressure meets the preset accuracy requirement based on the average mold cavity pressure and the predicted mold cavity pressure;

[0086] The scientific mold trial module is used to establish the mold cavity pressure mathematical model of the mold based on the average mold cavity pressure when the average mold cavity pressure meets the preset accuracy requirement.

[0087] Optionally, the production process monitoring module is used to determine a target cavity pressure of the injection molding stage corresponding to the injection molded product that meets the preset quality requirements based on a preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molded product;

[0088] The production process monitoring module is used to determine the target parameter value of the process parameter based on the target cavity pressure in the injection molding stage and the cavity pressure mathematical model.

[0089] Optionally, the pressure sensor collects an electrical signal of the mold cavity pressure;

[0090] The basic information management module is used to control the pressure sensor to send the electrical signal to a preset signal amplifier;

[0091] The basic information management module is used to control the signal amplifier to amplify the electrical signal and send the amplified electrical signal to a preset analog-to-digital converter;

[0092] The basic information management module is used to control the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and send the digital signal to a preset host computer;

[0093] The basic information management module is used to control the host computer to analyze the digital signal to obtain the mold cavity pressure.

[0094] Optionally, the scientific mold trial module is used to obtain the difference between the average mold cavity pressure and the predicted mold cavity pressure based on the average mold cavity pressure and the predicted mold cavity pressure;

[0095] The scientific mold trial module is used to confirm that the average mold cavity pressure meets the preset accuracy requirement when the difference between the average mold cavity pressure and the predicted mold cavity pressure is less than a preset difference threshold.

[0096] Optionally, the injection molding stage includes at least one of a pre-plasticization stage, a mold filling start stage, a filling completion stage, a pressure holding and shrinkage compensation stage, and a cooling stage.

[0097] Optionally, the process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

[0098] The embodiment of the present invention further discloses an electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0099] The memory is used to store computer programs;

[0100] The processor is used to implement the method described in the embodiment of the present invention when executing the program stored in the memory.

[0101] The embodiment of the present invention further discloses one or more computer-readable media on which instructions are stored. When executed by one or more processors, the processors are enabled to execute the method described in the embodiment of the present invention.

[0102] The embodiments of the present invention include the following advantages:

[0103] In an embodiment of the present invention, an injection molded product is made using a preset mold through at least one injection molding stage; the quality management system obtains at least one process parameter of the mold in the injection molding stage, and installs a preset pressure sensor at at least one position in the mold; based on the parameter value of the process parameter, the quality management system conducts a production experiment of the injection molded product, and during the production experiment, collects the cavity pressure of the mold in at least one injection molding stage through the pressure sensor; based on the cavity pressure of the mold in at least one injection molding stage, the quality management system establishes a mathematical model of the cavity pressure of the mold; based on the mathematical model of the cavity pressure and the preset quality requirements of the injection molded product, the quality management system determines the target parameter value of the process parameter, adjusts the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product made based on the target parameter value of the process parameter meets the preset quality requirements. In an embodiment of the present invention, the position and number of positions where the pressure sensors are installed are determined based on the need to detect the cavity pressure inside the mold cavity in at least one injection molding stage. The pressure sensors are used to monitor changes in cavity pressure at multiple locations in the mold cavity in real time. Based on the relationship between the cavity pressure and the quality of the molded product, it is determined whether the quality of the molded product during the injection molding process is within an acceptable range. Based on the cavity pressure curve and the relationship between the cavity pressure and the quality of the molded product, the influence of process parameters on the quality of the injection molded product can be analyzed, and the quality of the injection molded product can be optimized by reasonably setting the parameter values ​​of the process parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0104] Figure 1 is a flow chart of steps of a quality management method for injection molded products provided in an embodiment of the present invention;

[0105] Figure 2 is a schematic diagram of installing a pressure sensor at a gate provided in an embodiment of the present invention;

[0106] Figure 3 is a schematic diagram of a mold cavity pressure mathematical model provided in an embodiment of the present invention;

[0107] Figure 4 is a flow chart of steps of another method for quality management of injection molded products provided in an embodiment of the present invention;

[0108] Figure 5 is a structural block diagram of a quality management device for injection molded products provided in an embodiment of the present invention;

[0109] Figure 6 is a structural block diagram of a quality management system for injection molded products provided in an embodiment of the present invention;

[0110] Figure 7 is a block diagram of an electronic device provided in an embodiment of the present invention;

[0111] Figure 8 is a schematic diagram of a computer-readable medium provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0112] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0113] To facilitate understanding of the technical solutions and technical effects of the embodiments of the present invention, the prior art of the present invention is briefly described below.

[0114] Injection molding products are one of the most widely used plastic products. Traditional plastic molding methods include injection molding, extrusion molding, compression molding, and solid phase molding. Among them, injection molding is the most common and widely used plastic molding method.

[0115] In order to improve the quality of injection molded products, it is necessary to perform necessary quality control on the injection molding process. In the prior art, Cai Kan analyzed and obtained the mapping relationship between the process parameters in the injection molding process and the quality of the injection molded products through numerical calculation methods; RC Ricketson, KK Wang, L Shah and other scholars obtained the process parameters associated with the thickness of the injection molded products through empirical models and online training methods, and established a regression model using measured data; Dong Pengwei, Zhao Zhongli and other scholars analyzed the influence of process parameters on the thin-wall warpage of injection molded products through orthogonal simulation methods, and determined that the holding pressure in the injection molding process is the most important factor affecting the thin-wall warpage of injection molded products. After obtaining the relationship between the process parameters in the injection molding process and the quality of the injection molded products, the quality of the injection molded products can be optimized by adjusting the process parameters in the injection molding process.

[0116] In the prior art, the plastic molding processing method of injection molding is completed by relying on molds. The mold cavity of the mold includes a gate and a runner system. The process of injection molding includes the following steps: injecting molten plastic into the gate of the mold through an injection nozzle. Then, the molten plastic enters the runner system of the mold through the gate and flows into each mold cavity of the mold. In the mold cavity, the molten plastic cools and solidifies to form an injection molded product, and the shape of the mold cavity determines the shape and size of the injection molded product. Cavity pressure refers to the pressure that the plastic melt is subjected to in the mold cavity of the mold during the injection molding process. Cavity pressure can truly reflect the flow and filling state of the plastic melt in the mold, and is an important parameter that affects the quality of injection molding. At the same time, the cavity pressure in the injection molding process is also an important parameter that connects the process parameters in the injection molding process with the quality of the injection molded product.

[0117] Since the injection molding process is closed and complex, it is difficult to collect the state data in the mold cavity in a timely, efficient, accurate and low-cost manner during the injection molding process, and it is difficult to adjust the process parameters in the injection molding process based on the state data in the mold cavity, thereby optimizing the quality of the injection molded products. It should be noted that the closed and complex injection molding process also makes it difficult to directly measure and analyze the dynamic process inside the mold, and to establish a mathematical model to describe these dynamic processes in order to understand and control the injection molding process.

[0118] Reference Figure 1 , shows a flow chart of the steps of a quality management method for injection molded products provided in an embodiment of the present invention, which is applied to a quality management system for injection molded products; the injection molded products are made by using a preset mold through at least one injection molding stage; specifically, the following steps may be included:

[0119] Step 101, obtaining at least one process parameter of the mold in the injection molding stage, and installing a preset pressure sensor at at least one position in the mold;

[0120] In an embodiment of the present invention, an injection molded product is made using a mold. Specifically, molten plastic is injected into the gate of the mold through an injection nozzle. Then, the molten plastic enters the runner system of the mold through the gate and flows into each mold cavity of the mold. In the mold cavity, the molten plastic cools and solidifies to form an injection molded product, and the shape of the mold cavity determines the shape and size of the injection molded product. In an embodiment of the present invention, the gate and the runner system are considered to be part of the mold cavity. The process of making an injection molded product using a mold can be divided into at least one injection molding stage. Therefore, the injection molded product is made using a preset mold through at least one injection molding stage.

[0121] In an embodiment of the present invention, a quality management system for injection molded products can adjust and optimize the quality of injection molded products produced using molds. The quality management system can install a pressure sensor at at least one position in the mold. It should be noted that the position and number of the pressure sensors are installed based on the need to detect the cavity pressure inside the mold cavity at at least one injection molding stage. Specifically, seven pressure sensors can be installed inside the mold cavity based on the need to detect the cavity pressure inside the mold cavity at at least one injection molding stage.

[0122] Reference Figure 2 , shows a schematic diagram of installing a pressure sensor at a gate provided in an embodiment of the present invention. Figure 2 At the gate shown, two pressure sensors are installed at the gate according to the need to detect the cavity pressure at the gate during at least one injection molding stage.

[0123] Among them, cavity pressure refers to the pressure that the plastic melt bears in the cavity of the mold during the injection molding process. Cavity pressure is an important parameter that affects the quality of injection molding, and is also an important parameter that connects the process parameters in the injection molding process with the quality of the injection molded product.

[0124] In the embodiment of the present invention, the mold cavity pressure is an important parameter that connects the process parameters in the injection molding process and the quality of the injection molded product. Therefore, the process parameters in the injection molding process will affect the mold cavity pressure, and the mold cavity pressure in the injection molding stage will affect the quality of the injection molded product. Therefore, if the relationship between the process parameters and the mold cavity pressure in the injection molding process is obtained, according to the relationship between the process parameters and the mold cavity pressure, and the relationship between the mold cavity pressure and the quality of the injection molded product, the mold cavity pressure in the injection molding process can be adjusted by adjusting the process parameters, thereby optimizing the quality of the injection molded product.

[0125] In an embodiment of the present invention, the quality management system can obtain at least one process parameter of the mold during the injection molding stage. It should be noted that the process parameter is associated with the mold cavity pressure of the mold during the injection molding stage.

[0126] In some embodiments of the present invention, the process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

[0127] In an embodiment of the present invention, the quality management system can obtain the injection speed and injection pressure of the molten plastic of the mold during the injection molding stage, as well as the holding pressure and holding time during the injection molding stage. The holding pressure refers to the pressure that is continuously applied to the molten plastic after the molten plastic fills the mold cavity in order to fill the gap formed by cooling shrinkage and maintain the size and shape of the injection molded product. The holding time refers to the time from the completion of the molten plastic filling to the end of the holding stage to maintain the holding pressure.

[0128] In some embodiments of the present invention, the injection molding stage includes at least one of a pre-plasticization stage, a mold filling start stage, a filling completion stage, a pressure holding and shrinkage feeding stage, and a cooling stage.

[0129] In an embodiment of the present invention, the process of making an injection molded product using a mold can be divided into at least one injection molding stage. Specifically, the injection molding stage can include at least one of a pre-molding stage, a mold filling start stage, a filling completion stage, a pressure holding and shrinkage feeding stage, and a cooling stage.

[0130] Step 102, based on the parameter value of the process parameter, performing a manufacturing experiment of the injection molded product, and during the manufacturing experiment, collecting the mold cavity pressure of the mold in the at least one injection molding stage through the pressure sensor;

[0131] In an embodiment of the present invention, the quality management system can obtain a parameter value of at least one process parameter. Based on the parameter value of the process parameter, the quality management system can use the mold to perform an injection molding product manufacturing experiment. And during the process of the injection molding product manufacturing experiment, the quality management system can collect the mold cavity pressure of the mold in at least one injection molding stage through a pressure sensor. Based on the parameter value of the process parameter during the experiment and the mold cavity pressure collected during the experiment, the relationship between the process parameter and the mold cavity pressure can be obtained.

[0132] In some embodiments of the present invention, the manufacturing experiment of the injection molded product based on the parameter value of the process parameter includes:

[0133] For any of the process parameters, obtaining at least one parameter value of the process parameter;

[0134] Taking any parameter value of the at least one parameter value as a parameter value to be processed;

[0135] Combining the parameter values ​​to be processed of the process parameters to obtain a parameter value combination of the process parameters;

[0136] Based on the parameter value combination of the process parameters, at least one manufacturing experiment of the injection molded product is performed.

[0137] In an embodiment of the present invention, for any process parameter, the quality management system can obtain at least one parameter value of the process parameter, and use any parameter value of the at least one parameter value as a parameter value to be processed. By combining the parameter values ​​to be processed of multiple process parameters, a combination of parameter values ​​of multiple process parameters can be obtained. It should be noted that, since each process parameter has at least one parameter value, the quality management system can obtain multiple parameter value combinations.

[0138] For any combination of parameter values, the quality management system can use the mold to conduct at least one injection molding product production experiment based on the parameter value combination of the process parameters, and during each production experiment, collect the mold cavity pressure of the mold at each injection molding stage during the production experiment.

[0139] In some embodiments of the present invention, during the manufacturing experiment, collecting the mold cavity pressure of the mold in at least one injection molding stage by the pressure sensor includes:

[0140] For any one of the manufacturing experiments, during the manufacturing experiment, collecting the mold cavity pressure of the at least one injection molding stage;

[0141] In an embodiment of the present invention, the quality management system can obtain multiple parameter value combinations. For any parameter value combination, the quality management system can use the mold to perform at least one injection molding product manufacturing experiment based on the parameter value combination of the process parameters, and during each manufacturing experiment, collect the mold cavity pressure of each injection molding stage during the manufacturing experiment.

[0142] In some embodiments of the present invention, the pressure sensor collects an electrical signal of the mold cavity pressure; and collecting the mold cavity pressure of the mold in the at least one injection molding stage by the pressure sensor includes:

[0143] Controlling the pressure sensor to send the electrical signal to a preset signal amplifier;

[0144] Controlling the signal amplifier to amplify the electrical signal, and sending the amplified electrical signal to a preset analog-to-digital converter;

[0145] Controlling the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sending the digital signal to a preset host computer;

[0146] The host computer is controlled to analyze the digital signal to obtain the mold cavity pressure.

[0147] In an embodiment of the present invention, the steps of the quality management system collecting the cavity pressure of the mold in at least one injection molding stage through a pressure sensor are as follows: the pressure sensor collects the electrical signal of the cavity pressure, and the quality management system can control the pressure sensor to send the electrical signal to a preset signal amplifier. It should be noted that the electrical signal output by the sensor or sensitive element is generally very weak and difficult to be directly used for display, control or AD conversion (analog-to-digital conversion). The signal amplifier can amplify the weak electrical signal to a sufficient level so that the analog-to-digital converter can process or convert it, improve the signal accuracy, and prevent signal distortion. Therefore, the quality management system can control the signal amplifier to amplify the electrical signal and send the amplified electrical signal to a preset analog-to-digital converter. Specifically, the amplified electrical signal can be collected by a built-in acquisition card in the quality management system, and the collected electrical signal is sent to an analog-to-digital converter (A / D converter). The built-in acquisition card can be a CPU (central processing unit).

[0148] The quality management system controls the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sends the digital signal to the preset host computer through a preset communication protocol (USB / serial port), and controls the host computer to analyze the digital signal to obtain the specific value of the cavity pressure.

[0149] Step 103, establishing a mathematical model of the mold cavity pressure of the mold based on the mold cavity pressure of the mold in the at least one injection molding stage;

[0150] In an embodiment of the present invention, after collecting the mold cavity pressure of at least one injection molding stage during the injection molding product manufacturing experiment, a mold cavity pressure mathematical model can be established based on the mold cavity pressure of the mold in at least one injection molding stage.

[0151] In some embodiments of the present invention, the step of establishing a mathematical model of the mold cavity pressure based on the mold cavity pressure of the mold in the at least one injection molding stage includes:

[0152] For any of the injection molding stages, based on the mold cavity pressure corresponding to at least one of the manufacturing experiments, obtaining an average mold cavity pressure of the mold in the injection molding stage;

[0153] Based on the average cavity pressure, a cavity pressure mathematical model of the mold is established.

[0154] In an embodiment of the present invention, the quality management system can obtain multiple parameter value combinations. For any parameter value combination, the quality management system can use the mold to perform at least one injection molding product manufacturing experiment based on the parameter value combination of the process parameters, and during each manufacturing experiment, collect the mold cavity pressure of each injection molding stage during the manufacturing experiment.

[0155] Therefore, for any combination of parameter values, the quality management system can obtain multiple cavity pressures at each injection molding stage. Based on the cavity pressure corresponding to at least one manufacturing experiment, the quality management system can obtain the average cavity pressure of the mold during the injection molding stage. Based on the average cavity pressure, the quality management system can establish a mathematical model of the cavity pressure of the mold.

[0156] In the embodiment of the present invention, since the quality management system obtains multiple parameter value combinations, the quality management system can establish multiple mold cavity pressure mathematical models.

[0157] In some embodiments of the present invention, establishing a mathematical model of the mold cavity pressure based on the average mold cavity pressure includes:

[0158] Inputting the parameter value combination into a preset pressure prediction model to obtain a predicted cavity pressure of the mold in the injection molding stage;

[0159] Based on the average mold cavity pressure and the predicted mold cavity pressure, determining whether the average mold cavity pressure meets a preset accuracy requirement;

[0160] When the average cavity pressure meets the preset accuracy requirement, a cavity pressure mathematical model of the mold is established based on the average cavity pressure.

[0161] In an embodiment of the present invention, when establishing a mathematical model of the mold cavity pressure based on the average mold cavity pressure, the quality management system can input the parameter value combination into a preset pressure prediction model to obtain the predicted mold cavity pressure of the mold during the injection molding stage. Based on the average mold cavity pressure and the predicted mold cavity pressure, it is determined whether the average mold cavity pressure meets the preset accuracy requirements. If the average mold cavity pressure meets the preset accuracy requirements, the mathematical model of the mold cavity pressure can be established based on the average mold cavity pressure.

[0162] Reference Figure 3 , shows a schematic diagram of a mold cavity pressure mathematical model provided in an embodiment of the present invention. The injection molding stage may include a pre-molding stage, a mold filling start stage, a filling completion stage, a pressure holding and shrinkage feeding stage, and a cooling stage. Figure 3 The OA stage refers to the pre-plasticization stage, during which the mold cavity pressure remains basically unchanged; Figure 3 The ABC section refers to the initial mold filling stage, during which the mold cavity pressure rises sharply; Figure 3 The CD segment in the figure refers to the filling completion stage, during which the mold cavity pressure reaches its peak value; Figure 3 The DE section refers to the pressure-maintaining and shrinkage-feeding stage, during which the mold cavity pressure slowly decreases; Figure 3The EF section in the figure refers to the cooling stage. During this stage, the mold begins to cool, the injection molded product gradually leaves the surface of the pressure sensor, and the cavity pressure drops rapidly.

[0163] In some embodiments of the present invention, judging whether the average cavity pressure meets a preset accuracy requirement based on the average cavity pressure and the predicted cavity pressure includes:

[0164] Based on the average mold cavity pressure and the predicted mold cavity pressure, obtaining a difference between the average mold cavity pressure and the predicted mold cavity pressure;

[0165] When the difference between the average cavity pressure and the predicted cavity pressure is less than a preset difference threshold, it is confirmed that the average cavity pressure meets the preset accuracy requirement.

[0166] In an embodiment of the present invention, when the quality management system determines whether the average mold cavity pressure meets the preset accuracy requirements based on the average mold cavity pressure and the predicted mold cavity pressure, the difference between the average mold cavity pressure and the predicted mold cavity pressure can be obtained based on the average mold cavity pressure and the predicted mold cavity pressure, and when the difference between the average mold cavity pressure and the predicted mold cavity pressure is less than a preset difference threshold, it is confirmed that the average mold cavity pressure meets the preset accuracy requirements.

[0167] In the embodiment of the present invention, in the process of making injection molded products, all process parameters are combined and tested by factorial design, and the data of each combination are repeated. This is also called full factorial experimental design, which is to combine all levels of all experimental factors involved in the experiment to form different experimental conditions. Two or more independent repeated experiments are conducted under each experimental condition. Factorial design can detect the differences and interactions between various factors and between various levels of each factor, as well as the degree of interaction. The factors selected in this paper are 4 process parameters, and 4 levels are selected for each factor, that is, 4 experiments are required. 4 = 256 tests, each combination is repeated 4 times, and the average value is taken. According to the average of process input parameters, a more accurate acquisition result is finally obtained. Here, the pressure prediction can be performed through the neural network to observe the accuracy of this acquisition result.

[0168] Step 104, determining target parameter values ​​of the process parameters based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product;

[0169] In an embodiment of the present invention, after obtaining the cavity pressure mathematical model corresponding to the multiple parameter value combinations of the process parameters, since the cavity pressure mathematical model reflects the cavity pressure at different injection molding stages, based on the cavity pressure mathematical model corresponding to the multiple parameter value combinations, the preset quality requirements of the injection molded products, and the relationship between the cavity pressure and the quality of the injection molded products, the target parameter values ​​of the process parameters corresponding to the injection molded products that meet the preset quality requirements can be determined. If the injection molded products are manufactured using the mold based on the target parameter values ​​of the process parameters, the manufactured injection molded products meet the preset quality requirements. It should be noted that the cavity pressure mathematical model can be displayed on the screen provided by the quality management system.

[0170] In some embodiments of the present invention, determining the target parameter value of the process parameter based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product includes:

[0171] Determining a target cavity pressure of the injection molding stage corresponding to the injection molding product that meets the preset quality requirements based on a preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molding product;

[0172] The target parameter value of the process parameter is determined based on the target cavity pressure in the injection molding stage and the cavity pressure mathematical model.

[0173] In an embodiment of the present invention, the quality management system determines the target parameter value of the process parameter based on the cavity pressure mathematical model and the preset quality requirements of the injection molded product, including: determining the target cavity pressure of the injection molding stage corresponding to the injection molded product that meets the preset quality requirements based on the preset relationship between the cavity pressure of at least one injection molding stage and the quality of the injection molded product. Since the cavity pressure mathematical model reflects the cavity pressure corresponding to the parameter value combination of the process parameter, the target parameter value of the process parameter can be determined based on the target cavity pressure of the injection molding stage and the cavity pressure mathematical model.

[0174] Step 105 , adjusting the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

[0175] In an embodiment of the present invention, after obtaining the target parameter value of the process parameter, the quality management system can adjust the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product made based on the target parameter value of the process parameter meets the preset quality requirements.

[0176] In an embodiment of the present invention, an injection molded product is made using a preset mold through at least one injection molding stage; the quality management system obtains at least one process parameter of the mold in the injection molding stage, and installs a preset pressure sensor at at least one position in the mold; based on the parameter value of the process parameter, the quality management system conducts a production experiment of the injection molded product, and during the production experiment, collects the cavity pressure of the mold in at least one injection molding stage through the pressure sensor; based on the cavity pressure of the mold in at least one injection molding stage, the quality management system establishes a mathematical model of the cavity pressure of the mold; based on the mathematical model of the cavity pressure and the preset quality requirements of the injection molded product, the quality management system determines the target parameter value of the process parameter, adjusts the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product made based on the target parameter value of the process parameter meets the preset quality requirements. In an embodiment of the present invention, the position and number of the pressure sensors to be installed are determined based on the need to detect the cavity pressure inside the cavity during at least one injection molding stage, thereby avoiding the situation where, for small injection molded products, the pressure sensors are only installed in the runner system, and the pressure sensors installed in this way cannot detect the pressure in other parts of the cavity, or, for large injection molded products, the pressure sensors are only installed in the front and back thirds of the cavity, and such an arrangement cannot monitor the pressure changes during the injection molding process in real time.

[0177] In an embodiment of the present invention, the changes in cavity pressure at multiple locations in the cavity are monitored in real time by a pressure sensor, and the monitored cavity pressure data is visualized on a display in real time in combination with software, and based on the relationship between the cavity pressure and the quality of the injection molded product, it is determined whether the quality of the injection molded product during the injection molding process is within an acceptable range. In an embodiment of the present invention, the cavity pressure data collected under different parameter values ​​of the process parameters are visualized, digitized, and informationized as cavity pressure curves, and based on the cavity pressure curve and the relationship between the cavity pressure and the quality of the injection molded product, the influence of the process parameters on the quality of the injection molded product can be analyzed, and then the quality of the injection molded product can be optimized by the reasonable setting of the parameter values ​​of the process parameters. At the same time, the pressure preset model is used to determine whether the collected cavity pressure is correct, ensuring that the relationship between the analyzed process parameters and the quality of the injection molded product is correct, and providing a theoretical basis and data support for optimizing the quality of the injection molded product by the reasonable setting of the parameter values ​​of the process parameters.

[0178] Reference Figure 4 , shows a flow chart of steps of another quality management method for injection molded products provided in an embodiment of the present invention, which may specifically include the following steps:

[0179] Step 401, start.

[0180] Step 402, obtaining at least one process parameter of the mold in the injection molding stage, and installing a preset temperature / pressure sensor at at least one position in the mold. Based on the parameter value of the process parameter, an injection molded product manufacturing experiment is performed, and during the manufacturing experiment, the production process monitoring module collects the temperature / mold cavity pressure of the mold in at least one injection molding stage through the temperature / pressure sensor.

[0181] Step 403: The pressure sensor collects an electrical signal of the mold cavity pressure. The basic information management module controls the pressure sensor to send the electrical signal to a preset signal amplifier, and controls the signal amplifier to amplify the electrical signal.

[0182] Step 404: the basic information management module collects the amplified electrical signal through a built-in acquisition card.

[0183] Step 405, the basic information management module controls the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sends the digital signal to a preset host computer through a preset communication protocol (USB / serial port).

[0184] Step 406: The basic information management module controls the host computer to analyze the digital signal, obtain the mold cavity pressure, and send a control instruction.

[0185] Step 407: The intelligent injection molding platform receives the control instruction. The intelligent injection molding platform is a quality management system.

[0186] Step 408, the intelligent injection molding platform uses the production process monitoring module to monitor the progress of the manufacturing experiment and collect the mold cavity pressure. The basic information management module manages the collected mold cavity pressure, the historical data management module is used to store the collected mold cavity pressure, and the scientific mold trial module inputs the parameter value combination of the process parameters into the preset pressure prediction model to obtain the predicted mold cavity pressure of the mold in the injection molding stage. Based on the average mold cavity pressure and the predicted mold cavity pressure obtained from multiple manufacturing experiments, it is determined whether the average mold cavity pressure meets the preset accuracy requirements.

[0187] Step 409, end.

[0188] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0189] Reference Figure 5, shows a structural block diagram of a quality management device for injection molded products provided in an embodiment of the present invention, which is applied to a quality management system for injection molded products; the injection molded products are made by using a preset mold through at least one injection molding stage; specifically, the following modules may be included:

[0190] A process parameter acquisition module 501 is used to acquire at least one process parameter of the mold in the injection molding stage, and install a preset pressure sensor at at least one position in the mold;

[0191] An experiment conducting module 502, configured to conduct a manufacturing experiment of the injection molded product based on the parameter value of the process parameter, and to collect the mold cavity pressure of the mold in the at least one injection molding stage through the pressure sensor during the manufacturing experiment;

[0192] A model building module 503, used to build a mathematical model of the mold cavity pressure of the mold based on the mold cavity pressure of the mold in the at least one injection molding stage;

[0193] A target parameter value determination module 504 is used to determine the target parameter value of the process parameter based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product;

[0194] The adjustment module 505 is used to adjust the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

[0195] In an optional embodiment of the present invention, the experiment conducting module comprises:

[0196] A parameter value acquisition submodule, used for acquiring at least one parameter value of any of the process parameters;

[0197] The parameter value to be processed is used as a submodule, and is used to take any parameter value of the at least one parameter value as the parameter value to be processed;

[0198] A combination submodule, used for combining the to-be-processed parameter values ​​of the process parameters to obtain a parameter value combination of the process parameters;

[0199] The experiment conducting submodule is used to conduct at least one manufacturing experiment of the injection molded product based on the parameter value combination of the process parameters.

[0200] In an optional embodiment of the present invention, the experiment conducting module comprises:

[0201] A mold cavity pressure collection submodule, for collecting the mold cavity pressure of at least one injection molding stage during any one of the manufacturing experiments;

[0202] The model building module includes:

[0203] An average mold cavity pressure acquisition submodule, used for acquiring, for any of the injection molding stages, an average mold cavity pressure of the mold in the injection molding stage based on the mold cavity pressure corresponding to at least one of the manufacturing experiments;

[0204] The model building submodule is used to build a mathematical model of the mold cavity pressure of the mold based on the average mold cavity pressure.

[0205] In an optional embodiment of the present invention, the model building submodule includes:

[0206] An input unit, used for inputting the parameter value combination into a preset pressure prediction model to obtain a predicted cavity pressure of the mold in the injection molding stage;

[0207] A judging unit, configured to judge whether the average cavity pressure meets a preset accuracy requirement based on the average cavity pressure and the predicted cavity pressure;

[0208] An establishing unit is used to establish the cavity pressure mathematical model of the mold based on the average cavity pressure when the average cavity pressure meets the preset accuracy requirement.

[0209] In an optional embodiment of the present invention, the target parameter value determination module includes:

[0210] a target cavity pressure determination submodule, configured to determine a target cavity pressure of the injection molding stage corresponding to the injection molding product that meets the preset quality requirements based on a preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molding product;

[0211] The target parameter value determination submodule is used to determine the target parameter value of the process parameter based on the target cavity pressure and the cavity pressure mathematical model in the injection molding stage.

[0212] In an optional embodiment of the present invention, the pressure sensor collects an electrical signal of the mold cavity pressure; and the experiment module includes:

[0213] A sending submodule, used for controlling the pressure sensor to send the electrical signal to a preset signal amplifier;

[0214] an amplification submodule, used for controlling the signal amplifier to amplify the electrical signal, and sending the amplified electrical signal to a preset analog-to-digital converter;

[0215] A conversion submodule, used for controlling the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sending the digital signal to a preset host computer;

[0216] The analysis submodule is used to control the host computer to analyze the digital signal to obtain the mold cavity pressure.

[0217] In an optional embodiment of the present invention, the judging unit includes:

[0218] a difference acquisition subunit, configured to acquire a difference between the average cavity pressure and the predicted cavity pressure based on the average cavity pressure and the predicted cavity pressure;

[0219] The confirmation subunit is used to confirm that the average mold cavity pressure meets the preset accuracy requirement when the difference between the average mold cavity pressure and the predicted mold cavity pressure is less than a preset difference threshold.

[0220] In an optional embodiment of the present invention, the injection molding stage includes at least one of a pre-plasticization stage, a start-mold filling stage, a filling completion stage, a pressure-maintaining and shrinkage-feeding stage, and a cooling stage.

[0221] In an optional embodiment of the present invention, the process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

[0222] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0223] Reference Figure 6 , shows a structural block diagram of a quality management system for injection molded products provided in an embodiment of the present invention, which may specifically include the following modules:

[0224] A basic information management module 601 is used to obtain process parameters of a mold used to make a preset injection molded product in at least one injection molding stage of the injection molded product;

[0225] A production process monitoring module 602, used to install a preset pressure sensor at at least one position in the mold;

[0226] A production process monitoring module 602, configured to perform a manufacturing experiment of the injection molded product based on a parameter value of at least one of the process parameters, and to collect the mold cavity pressure of the mold in the at least one injection molding stage through the pressure sensor during the manufacturing experiment;

[0227] A scientific mold trial module 603 is used to establish a mold cavity pressure mathematical model of the mold based on the mold cavity pressure of the mold in the at least one injection molding stage;

[0228] A production process monitoring module 602, for determining target parameter values ​​of the process parameters based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product;

[0229] The production process monitoring module 602 is used to adjust the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

[0230] In an optional embodiment of the present invention, the basic information management module is used to obtain at least one parameter value of any of the process parameters;

[0231] The basic information management module is used to use any parameter value of the at least one parameter value as a parameter value to be processed;

[0232] The basic information management module is used to combine the to-be-processed parameter values ​​of the process parameters to obtain a parameter value combination of the process parameters;

[0233] The production process monitoring module is used to perform at least one manufacturing experiment of the injection molded product based on the parameter value combination of the process parameters.

[0234] In an optional embodiment of the present invention, the production process monitoring module is used to collect the mold cavity pressure of at least one injection molding stage during any one of the manufacturing experiments;

[0235] The scientific mold trial module is used to obtain the average mold cavity pressure of the mold in the injection molding stage based on the mold cavity pressure corresponding to at least one of the manufacturing experiments for any of the injection molding stages;

[0236] The scientific mold trial module is used to establish a mold cavity pressure mathematical model of the mold based on the average mold cavity pressure.

[0237] In an optional embodiment of the present invention, the scientific mold trial module is used to input the parameter value combination into a preset pressure prediction model to obtain the predicted mold cavity pressure of the mold in the injection molding stage;

[0238] The scientific mold trial module is used to determine whether the average mold cavity pressure meets the preset accuracy requirement based on the average mold cavity pressure and the predicted mold cavity pressure;

[0239] The scientific mold trial module is used to establish the mold cavity pressure mathematical model of the mold based on the average mold cavity pressure when the average mold cavity pressure meets the preset accuracy requirement.

[0240] In an optional embodiment of the present invention, the production process monitoring module is used to determine the target cavity pressure of the injection molding stage corresponding to the injection molded product that meets the preset quality requirements based on the preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molded product;

[0241] The production process monitoring module is used to determine the target parameter value of the process parameter based on the target cavity pressure in the injection molding stage and the cavity pressure mathematical model.

[0242] In an optional embodiment of the present invention, the pressure sensor collects an electrical signal of the mold cavity pressure;

[0243] The basic information management module is used to control the pressure sensor to send the electrical signal to a preset signal amplifier;

[0244] The basic information management module is used to control the signal amplifier to amplify the electrical signal and send the amplified electrical signal to a preset analog-to-digital converter;

[0245] The basic information management module is used to control the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and send the digital signal to a preset host computer;

[0246] The basic information management module is used to control the host computer to analyze the digital signal to obtain the mold cavity pressure.

[0247] In an optional embodiment of the present invention, the scientific mold trial module is used to obtain the difference between the average mold cavity pressure and the predicted mold cavity pressure based on the average mold cavity pressure and the predicted mold cavity pressure;

[0248] The scientific mold trial module is used to confirm that the average mold cavity pressure meets the preset accuracy requirement when the difference between the average mold cavity pressure and the predicted mold cavity pressure is less than a preset difference threshold.

[0249] In an optional embodiment of the present invention, the injection molding stage includes at least one of a pre-plasticization stage, a start-mold filling stage, a filling completion stage, a pressure-maintaining and shrinkage-feeding stage, and a cooling stage.

[0250] In an optional embodiment of the present invention, the process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

[0251] As for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0252] In addition, an embodiment of the present invention further provides an electronic device, such as Figure 7 As shown, it includes a processor 701, a communication interface 702, a memory 703 and a communication bus 704, wherein the processor 701, the communication interface 702, and the memory 703 communicate with each other through the communication bus 704.

[0253] Memory 703, used for storing computer programs;

[0254] The processor 701 is used to execute the program stored in the memory 703 to implement the following steps:

[0255] Acquire at least one process parameter of the mold in the injection molding stage, and install a preset pressure sensor at at least one position in the mold;

[0256] Based on the parameter value of the process parameter, a manufacturing experiment of the injection molded product is performed, and during the manufacturing experiment, the mold cavity pressure of the mold in the at least one injection molding stage is collected by the pressure sensor;

[0257] Establishing a mathematical model of the mold cavity pressure of the mold based on the mold cavity pressure of the mold in the at least one injection molding stage;

[0258] Determining target parameter values ​​of the process parameters based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product;

[0259] The parameter value of the process parameter in the injection molding stage is adjusted to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

[0260] In an optional embodiment of the present invention, the manufacturing experiment of the injection molded product based on the parameter value of the process parameter includes:

[0261] For any of the process parameters, obtaining at least one parameter value of the process parameter;

[0262] Taking any parameter value of the at least one parameter value as a parameter value to be processed;

[0263] Combining the parameter values ​​to be processed of the process parameters to obtain a parameter value combination of the process parameters;

[0264] Based on the parameter value combination of the process parameters, at least one manufacturing experiment of the injection molded product is performed.

[0265] In an optional embodiment of the present invention, during the manufacturing experiment, collecting the mold cavity pressure of the mold in at least one injection molding stage by the pressure sensor includes:

[0266] For any one of the manufacturing experiments, during the manufacturing experiment, collecting the mold cavity pressure of the at least one injection molding stage;

[0267] The step of establishing a mathematical model of the mold cavity pressure based on the mold cavity pressure of the mold in at least one injection molding stage comprises:

[0268] For any of the injection molding stages, based on the mold cavity pressure corresponding to at least one of the manufacturing experiments, obtaining an average mold cavity pressure of the mold in the injection molding stage;

[0269] Based on the average cavity pressure, a cavity pressure mathematical model of the mold is established.

[0270] In an optional embodiment of the present invention, the step of establishing a mathematical model of the mold cavity pressure based on the average mold cavity pressure includes:

[0271] Inputting the parameter value combination into a preset pressure prediction model to obtain a predicted cavity pressure of the mold in the injection molding stage;

[0272] Based on the average mold cavity pressure and the predicted mold cavity pressure, determining whether the average mold cavity pressure meets a preset accuracy requirement;

[0273] When the average cavity pressure meets the preset accuracy requirement, a cavity pressure mathematical model of the mold is established based on the average cavity pressure.

[0274] In an optional embodiment of the present invention, determining the target parameter value of the process parameter based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product includes:

[0275] Determining a target cavity pressure of the injection molding stage corresponding to the injection molding product that meets the preset quality requirements based on a preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molding product;

[0276] The target parameter value of the process parameter is determined based on the target cavity pressure in the injection molding stage and the cavity pressure mathematical model.

[0277] In an optional embodiment of the present invention, the pressure sensor collects an electrical signal of the mold cavity pressure; and collecting the mold cavity pressure of the mold in the at least one injection molding stage by the pressure sensor includes:

[0278] Controlling the pressure sensor to send the electrical signal to a preset signal amplifier;

[0279] Controlling the signal amplifier to amplify the electrical signal, and sending the amplified electrical signal to a preset analog-to-digital converter;

[0280] Controlling the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sending the digital signal to a preset host computer;

[0281] The host computer is controlled to analyze the digital signal to obtain the mold cavity pressure.

[0282] In an optional embodiment of the present invention, judging whether the average cavity pressure meets a preset accuracy requirement based on the average cavity pressure and the predicted cavity pressure includes:

[0283] Based on the average mold cavity pressure and the predicted mold cavity pressure, obtaining a difference between the average mold cavity pressure and the predicted mold cavity pressure;

[0284] When the difference between the average cavity pressure and the predicted cavity pressure is less than a preset difference threshold, it is confirmed that the average cavity pressure meets the preset accuracy requirement.

[0285] In an optional embodiment of the present invention, the injection molding stage includes at least one of a pre-plasticization stage, a start-mold filling stage, a filling completion stage, a pressure-maintaining and shrinkage-feeding stage, and a cooling stage.

[0286] In an optional embodiment of the present invention, the process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

[0287] The communication bus mentioned in the above terminal can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0288] The communication interface is used for communication between the above terminal and other devices.

[0289] The memory may include a random access memory (RAM) or a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0290] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0291] like Figure 8 As shown, in another embodiment provided by the present invention, a computer-readable storage medium 801 is also provided, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer executes a quality management method for injection molded products described in the above embodiment.

[0292] In another embodiment provided by the present invention, a computer program product including instructions is also provided, which, when executed on a computer, enables the computer to execute a quality management method for injection molded products as described in the above embodiment.

[0293] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk Solid State Disk (SSD)), etc.

[0294] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0295] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0296] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A quality management method for injection molded products, characterized in that: Quality management system applied to injection molded products; The injection molded product is made by using a preset mold through at least one injection molding stage; the method comprises: Acquire at least one process parameter of the mold during the injection molding stage, and install a preset pressure sensor at at least one position in the mold; Based on the parameter value of the process parameter, a manufacturing experiment of the injection molded product is performed, and during the manufacturing experiment, the mold cavity pressure of the mold in the at least one injection molding stage is collected by the pressure sensor; Establishing a mathematical model of the mold cavity pressure based on the mold cavity pressure of the mold in the at least one injection molding stage; Determining target parameter values ​​of the process parameters based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product; The parameter value of the process parameter in the injection molding stage is adjusted to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

2. The method according to claim 1, characterized in that The step of conducting a manufacturing experiment of the injection molded product based on the parameter value of the process parameter comprises: For any of the process parameters, obtaining at least one parameter value of the process parameter; Taking any parameter value of the at least one parameter value as a parameter value to be processed; Combining the parameter values ​​to be processed of the process parameters to obtain a parameter value combination of the process parameters; Based on the parameter value combination of the process parameters, at least one manufacturing experiment of the injection molded product is performed.

3. The method according to claim 2, characterized in that During the manufacturing experiment, collecting the mold cavity pressure of the mold in at least one injection molding stage by the pressure sensor includes: For any one of the manufacturing experiments, during the manufacturing experiment, collecting the mold cavity pressure of the at least one injection molding stage; The step of establishing a mathematical model of the mold cavity pressure based on the mold cavity pressure of the mold in at least one injection molding stage comprises: For any of the injection molding stages, based on the mold cavity pressure corresponding to at least one of the manufacturing experiments, obtaining an average mold cavity pressure of the mold in the injection molding stage; Based on the average cavity pressure, a cavity pressure mathematical model of the mold is established.

4. The method according to claim 3, characterized in that The step of establishing a mathematical model of the mold cavity pressure based on the average mold cavity pressure comprises: Inputting the parameter value combination into a preset pressure prediction model to obtain a predicted cavity pressure of the mold in the injection molding stage; Based on the average mold cavity pressure and the predicted mold cavity pressure, determining whether the average mold cavity pressure meets a preset accuracy requirement; When the average cavity pressure meets the preset accuracy requirement, a cavity pressure mathematical model of the mold is established based on the average cavity pressure.

5. The method according to claim 1, characterized in that The step of determining the target parameter value of the process parameter based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product comprises: Determining a target cavity pressure of the injection molding stage corresponding to the injection molding product that meets the preset quality requirements based on a preset relationship between the cavity pressure of the at least one injection molding stage and the quality of the injection molding product; The target parameter value of the process parameter is determined based on the target cavity pressure in the injection molding stage and the cavity pressure mathematical model.

6. The method according to claim 1, characterized in that The pressure sensor collects an electrical signal of the mold cavity pressure; the method of collecting the mold cavity pressure of the mold in at least one injection molding stage by the pressure sensor includes: Controlling the pressure sensor to send the electrical signal to a preset signal amplifier; Controlling the signal amplifier to amplify the electrical signal, and sending the amplified electrical signal to a preset analog-to-digital converter; Controlling the analog-to-digital converter to convert the amplified electrical signal into a digital signal, and sending the digital signal to a preset host computer; The host computer is controlled to analyze the digital signal to obtain the mold cavity pressure.

7. The method according to claim 4, characterized in that The determining, based on the average mold cavity pressure and the predicted mold cavity pressure, whether the average mold cavity pressure meets a preset accuracy requirement includes: Based on the average cavity pressure and the predicted cavity pressure, obtaining a difference between the average cavity pressure and the predicted cavity pressure; When the difference between the average cavity pressure and the predicted cavity pressure is less than a preset difference threshold, it is confirmed that the average cavity pressure meets the preset accuracy requirement.

8. The method according to claim 1, characterized in that The injection molding stage includes at least one of a pre-plasticization stage, a mold filling start stage, a filling completion stage, a pressure holding and shrinkage feeding stage, and a cooling stage.

9. The method according to claim 1, characterized in that: The process parameters include at least one of injection speed, holding pressure, holding time and injection pressure.

10. A quality management device for injection molded products, characterized in that: Quality management system applied to injection molded products; The injection molded product is made by using a preset mold through at least one injection molding stage; the device comprises: A process parameter acquisition module, used to acquire at least one process parameter of the mold during the injection molding stage, and install a preset pressure sensor at at least one position in the mold; an experiment conducting module, for conducting a manufacturing experiment of the injection molded product based on the parameter value of the process parameter, and collecting the mold cavity pressure of the mold in the at least one injection molding stage through the pressure sensor during the manufacturing experiment; A model building module, used for building a mathematical model of the mold cavity pressure of the mold based on the mold cavity pressure of the mold in the at least one injection molding stage; A target parameter value determination module, used to determine the target parameter value of the process parameter based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product; An adjustment module is used to adjust the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

11. A quality management system for injection molded products, characterized in that: include: A basic information management module, used to obtain process parameters of a mold used to make a preset injection molded product in at least one injection molding stage of the injection molded product; A production process monitoring module, used for installing a preset pressure sensor at at least one position in the mold; A production process monitoring module, configured to perform a manufacturing experiment of the injection molded product based on a parameter value of at least one of the process parameters, and to collect the mold cavity pressure of the mold in the at least one injection molding stage through the pressure sensor during the manufacturing experiment; A scientific mold trial module, used for establishing a mold cavity pressure mathematical model of the mold based on the mold cavity pressure of the mold in at least one injection molding stage; A production process monitoring module, used for determining target parameter values ​​of the process parameters based on the mold cavity pressure mathematical model and the preset quality requirements of the injection molded product; A production process monitoring module is used to adjust the parameter value of the process parameter in the injection molding stage to the target parameter value, so that the injection molded product manufactured based on the target parameter value of the process parameter meets the preset quality requirement.

12. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; The memory is used to store computer programs; The processor is used to implement the method according to any one of claims 1 to 9 when executing the program stored in the memory.

13. One or more computer-readable media having instructions stored thereon, which when executed by one or more processors cause the processors to perform the method of any one of claims 1-9.

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