A mobile phone card tray continuous injection molding method and device

Abstract

The present application provides a method and device for continuous injection molding of a mobile phone card tray. First, a mold inner side pressure sequence is collected during the injection molding process. According to the mold inner side pressure sequence and the initial plastic liquid flow rate, a first plastic liquid diffusion angle of the mobile phone card tray mold is determined. A plastic liquid infrared image set is collected. According to the plastic liquid infrared image set, temperature fault points are extracted to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card tray plastic liquid. According to the temperature fault points and the gradient temperature diffusion coefficient, a thermal diffusion analysis is performed to obtain the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid. According to the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, a plastic liquid diffusion deviation is determined. Finally, according to the plastic liquid diffusion deviation, the plastic liquid flow rate in the subsequent injection molding process is adjusted, so as to avoid sub-surface damage caused by local overheating inside the mobile phone card tray during the injection molding process, thereby improving the processing quality of the mobile phone card tray injection molding process.

Description

Technical Field

[0001] The present application relates to the field of injection molding technology, and more specifically, to a method and device for continuous injection molding of mobile phone card trays, such as terminal devices, chips, computer storage media, etc. Background Art

[0002] Mobile phone card trays are also called mobile phone card slots. They are used to insert user identity cards (SIM cards) or secure digital memory cards (SD cards). Currently, mobile phone card trays are mainly made by injection molding. Injection molding refers to heating thermoplastic plastics or thermosetting materials to a certain temperature, injecting them into a mold under high pressure, filling the mold cavity and cooling and solidifying them within a certain period of time to finally obtain a plastic product of the desired shape. It has the advantages of simple process and short production cycle. Therefore, the continuous injection molding method has become the current mainstream for manufacturing mobile phone card trays.

[0003] However, in the existing continuous injection molding method, injection molding is often performed directly into the mobile phone card holder mold according to a preset plastic liquid flow rate, and the abnormal heat diffusion of the plastic liquid inside the mobile phone card holder mold is not detected during the injection molding process. Therefore, after the mobile phone card holder plastic liquid enters the mobile phone card holder mold, a large amount of shear heat is easily generated under the rapid fountain flow of the plastic liquid, resulting in thermal decomposition or bubbles of the plastic liquid inside the mobile phone card holder due to local overheating during the injection molding process of the mobile phone card holder. The sub-surface damage inside the card holder generated is difficult to detect, which greatly damages the product quality of the mobile phone card holder injection molding. Summary of the invention

[0004] The present application provides a method and device for continuous injection molding of a mobile phone card tray, so as to solve the technical problem that the surface of the mobile phone card tray is damaged due to local overheating during the injection molding process of the mobile phone card tray.

[0005] In a first aspect, the present application provides a method for continuous injection molding of a mobile phone card tray. The method can be executed by a network device, or can also be executed by a chip configured in the network device, and the present application does not limit this.

[0006] Specifically, the method includes:

[0007] Injection molding is performed on the mobile phone card tray mold according to a preset initial plastic liquid flow rate, and during the injection molding process, the inner pressure of the side wall of the mobile phone card tray mold is collected to obtain an inner mold side pressure sequence;

[0008] Determining a first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate;

[0009] Collecting a set of infrared images of the mobile phone card tray plastic liquid in the mobile phone card tray mold;

[0010] Extracting temperature fault points of the plastic liquid infrared image set to obtain temperature fault points and gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid;

[0011] Performing thermal diffusion analysis according to the temperature fault point and the gradient temperature diffusion coefficient to obtain a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid;

[0012] The plastic liquid diffusion deviation is determined by the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and the plastic liquid flow rate in the subsequent injection molding process is adjusted according to the plastic liquid diffusion deviation.

[0013] In combination with the first aspect, in certain implementations of the first aspect, determining the first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate specifically includes:

[0014] Acquire each mold inner side pressure value in the mold inner side pressure sequence;

[0015] Acquire the number and collection interval of the mold inner side pressure values ​​in the mold inner side pressure sequence;

[0016] Obtaining the initial plastic liquid flow rate;

[0017] The first plastic liquid diffusion angle of the mobile phone card tray mold is determined according to each mold inner side pressure value in the mold inner side pressure sequence, the number and collection interval of the mold inner side pressure values ​​in the mold inner side pressure sequence, and the initial plastic liquid flow rate.

[0018] In combination with the first aspect, in certain implementations of the first aspect, extracting temperature fault points of the plastic liquid infrared image set to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card tray plastic liquid specifically includes:

[0019] Performing differential processing on the plastic liquid infrared image set to obtain a differential infrared image set;

[0020] Determining a thermal diffusion feature enhanced image according to the differential infrared image set;

[0021] The temperature feature is extracted from the thermal diffusion feature enhanced image to obtain the temperature fault point and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid.

[0022] In combination with the first aspect, in certain implementations of the first aspect, determining the thermal diffusion feature enhanced image according to the differential infrared image set may also be implemented by using the following steps:

[0023] Acquire each differential infrared image in the differential infrared image set;

[0024] The thermal diffusion feature enhanced image is determined according to the grayscale value of the pixel points of each differential infrared image in the differential infrared image set.

[0025] In combination with the first aspect, in certain implementations of the first aspect, extracting temperature features from the thermal diffusion feature enhanced image to obtain the temperature fault point and the gradient temperature diffusion coefficient of the mobile phone card tray plastic liquid specifically includes:

[0026] Obtaining a preset fault threshold, and taking the pixel points in the thermal diffusion feature enhanced image whose grayscale values ​​are higher than the fault threshold as temperature fault points;

[0027] The grayscale values ​​of the neighboring pixels of the temperature fault point are obtained, and the gradient temperature diffusion coefficients corresponding to the respective temperature fault points are determined according to the grayscale values ​​of the temperature fault point and its neighboring pixels.

[0028] In combination with the first aspect, in certain implementations of the first aspect, a screw preplasticizer is used to injection mold the mobile phone card tray mold.

[0029] In combination with the first aspect, in certain implementations of the first aspect, a pressure sensor is used to collect the pressure inside the side wall of the mobile phone card tray mold at equal intervals to obtain a mold inner side pressure sequence.

[0030] In a second aspect, the present application provides a mobile phone card tray continuous injection molding device, which includes an injection molding control unit, and the injection molding control unit includes:

[0031] A data acquisition module is used to perform injection molding on the mobile phone card tray mold according to a preset initial plastic liquid flow rate, and collect the inner pressure of the side wall of the mobile phone card tray mold during the injection molding process to obtain an inner mold side pressure sequence;

[0032] A processing module, used for determining a first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate;

[0033] The processing module is further used to collect a set of infrared images of the mobile phone card tray plastic liquid in the mobile phone card tray mold;

[0034] The processing module is also used to extract temperature fault points of the plastic liquid infrared image set to obtain the temperature fault points and gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid;

[0035] The processing module is also used to perform thermal diffusion analysis according to the temperature fault point and the gradient temperature diffusion coefficient to obtain a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid;

[0036] The injection molding control module is used to determine the plastic liquid diffusion deviation degree based on the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and adjust the plastic liquid flow rate in the subsequent injection molding process according to the plastic liquid diffusion deviation degree.

[0037] In a third aspect, the present application provides a computer terminal device, comprising a memory and a processor, wherein the memory stores codes, and the processor is configured to obtain the codes and execute the above-mentioned mobile phone card tray continuous injection molding method.

[0038] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one computer program, and the computer program is loaded and executed by a processor to implement the operations performed by the above-mentioned mobile phone card tray continuous injection molding method.

[0039] The technical solution provided by the embodiments disclosed in this application has the following beneficial effects:

[0040] In a mobile phone card tray continuous injection molding method and device provided by the present application, the mobile phone card tray mold is firstly injection molded according to a preset initial plastic liquid flow rate, the inner pressure of the side wall of the mobile phone card tray mold is collected during the injection molding process to obtain a mold inner side pressure sequence, the first plastic liquid diffusion angle of the mobile phone card tray mold is determined according to the mold inner side pressure sequence and the initial plastic liquid flow rate, a plastic liquid infrared image set is collected, temperature fault points are extracted according to the plastic liquid infrared image set to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card tray plastic liquid, thermal diffusion analysis is performed according to the temperature fault points and the gradient temperature diffusion coefficient to obtain the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and the plastic liquid diffusion angle of the mobile phone card tray is obtained by hand. The first plastic liquid diffusion angle of the machine card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid are used to determine the plastic liquid diffusion deviation, and finally the plastic liquid flow rate in the subsequent injection molding process is adjusted according to the plastic liquid diffusion deviation. The application determines the plastic liquid diffusion deviation by the deviation between the plastic liquid diffusion direction and the thermal diffusion direction of the plastic liquid. The plastic liquid diffusion deviation is used to reflect the abnormal thermal diffusion of the mobile phone card tray plastic liquid. The plastic liquid flow rate is adjusted according to the plastic liquid diffusion deviation, which can reduce the shear heat generated in the subsequent injection molding process, avoid sub-surface damage caused by local overheating inside the mobile phone card tray during the injection molding process, and improve the processing quality of the mobile phone card tray injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is an exemplary flow chart of a method for continuous injection molding of a mobile phone card tray according to some embodiments of the present application;

[0042] Figure 2 is an exemplary flow chart of extracting temperature fault points from the plastic liquid infrared image set in some embodiments of the present application;

[0043] Figure 3 is a data distribution diagram of the sub-surface damage area and plastic liquid diffusion deviation of the mobile phone card holder in some embodiments of the present application;

[0044] Figure 4 is a correlation coefficient diagram between the plastic liquid diffusion deviation degree of the plastic liquid at different temperatures during the injection molding process and the internal sub-surface damage area of ​​the mobile phone card tray in this application;

[0045] Figure 5 is a schematic diagram of exemplary hardware and / or software of an injection molding control unit according to some embodiments of the present application;

[0046] Figure 6 It is a structural schematic diagram of a computer terminal device that implements a method for continuous injection molding of a mobile phone card tray according to some embodiments of the present application. DETAILED DESCRIPTION

[0047] The present application first performs injection molding on a mobile phone card tray mold according to a preset initial plastic liquid flow rate, collects the inner pressure of the side wall of the mobile phone card tray mold during the injection molding process, obtains a mold inner side pressure sequence, determines a first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate, collects a plastic liquid infrared image set, extracts temperature fault points according to the plastic liquid infrared image set, obtains temperature fault points and a gradient temperature diffusion coefficient of the mobile phone card tray plastic liquid, performs thermal diffusion analysis according to the temperature fault points and the gradient temperature diffusion coefficient, obtains a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and obtains a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid according to the first plastic liquid of the mobile phone card tray mold. The plastic liquid diffusion deviation is determined by the diffusion angle and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and finally the plastic liquid flow rate in the subsequent injection molding process is adjusted according to the plastic liquid diffusion deviation. The application determines the plastic liquid diffusion deviation by the deviation between the plastic liquid diffusion direction and the thermal diffusion direction of the plastic liquid. The plastic liquid diffusion deviation is used to reflect the abnormal thermal diffusion of the mobile phone card tray plastic liquid. The plastic liquid flow rate is adjusted according to the plastic liquid diffusion deviation, which can reduce the shear heat generated in the subsequent injection molding process, avoid sub-surface damage caused by local overheating inside the mobile phone card tray during the injection molding process, and improve the processing quality of the mobile phone card tray injection molding process.

[0048] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Figure 1 , which is an exemplary flow chart of a method for continuous injection molding of a mobile phone card tray according to some embodiments of the present application. The method 100 for continuous injection molding of a mobile phone card tray mainly includes the following steps:

[0049] In step S101, the mobile phone card tray mold is injection molded according to a preset initial plastic liquid flow rate, and the inner pressure of the side wall of the mobile phone card tray mold is collected during the injection molding process to obtain a mold inner side pressure sequence.

[0050] It should be noted that the initial plastic liquid flow rate is preset as a constant according to the size of the internal space of the mobile phone card holder mold. The initial plastic liquid flow rate is the pipeline plastic liquid flow rate when the plasticizer in the injection molding machine performs pressurized injection molding into the interior of the mobile phone card holder mold. In some embodiments, a screw pre-plasticizer can be used to injection mold the mobile phone card holder mold, or other devices or equipment that can perform injection molding on the mobile phone card holder mold, such as a reciprocating screw injection device, can be used. There is no limitation here.

[0051] In some embodiments, a pressure sensor located inside the mobile phone card holder mold can be used to collect the side wall pressure of the mobile phone card holder mold at collection intervals to obtain an inner mold side pressure sequence. It should be noted that the flow of the plastic liquid in the mold is affected by the side wall pressure. If the plastic liquid is required to be fully filled in the mold and form a complete structure, a certain side wall pressure is required to push the plastic to fill the details to ensure the quality of the molded product. Therefore, the side wall pressure value is usually positively correlated with the quality of the plastic liquid in the mobile phone card holder mold diffused to the side wall. The flow and diffusion of the plastic liquid in the mold can be analyzed by the inner membrane pressure sequence. In some other embodiments, other devices or equipment that can collect the lower wall inner mold pressure in the mobile phone card holder mold can also be used, which is not limited here.

[0052] In step S102, a first plastic liquid diffusion angle of the mobile phone card tray mold is determined according to the mold inner side pressure sequence and the initial plastic liquid flow rate.

[0053] It should be noted that the mobile phone card holder plastic liquid is a high-temperature liquid plastic obtained after the thermoplastic plastic is melted. After the mobile phone card holder plastic liquid enters the mobile phone card holder mold, it will diffuse to the surroundings due to its own dynamic viscosity of the fluid. The first plastic liquid diffusion angle of the mobile phone card holder mold in this application is used to characterize the angle between the diffusion direction of the mobile phone card holder plastic liquid and the plastic liquid discharge direction when it diffuses. In some embodiments, the first plastic liquid diffusion angle is determined according to the feeding speed of the plastic liquid and the rate of increase of the inner side pressure of the mold. Specifically, the injection molding process is pressurized by the plasticizer to squeeze the molten high-temperature plastic liquid into the mold. The plastic liquid injection port is usually located at the center of mass of the bottom of the mold. After the plastic liquid enters the mold, it accumulates at the center of the bottom of the mold due to its own surface tension and diffuses to the surroundings. When it diffuses to the side wall of the mold, it generates inner side pressure on the side wall. Therefore, the diffusion direction of the mobile phone card holder plastic liquid during the injection molding process can be determined according to the discharge mass of the high-temperature plastic liquid per unit time in the injection molding process (initial plastic liquid flow rate) and the mass increase rate of the plastic liquid with a lower temperature on the side (membrane inner side pressure sequence).

[0054] In a specific implementation, according to the mold inner side pressure sequence and the initial plastic liquid flow rate, determining the first plastic liquid diffusion angle of the mobile phone card tray mold can be achieved by adopting the following steps:

[0055] Acquire each mold inner side pressure value in the mold inner side pressure sequence;

[0056] Acquire the number and collection interval of the mold inner side pressure values ​​in the mold inner side pressure sequence;

[0057] Obtaining the initial plastic liquid flow rate;

[0058] The first plastic liquid diffusion angle of the mobile phone card tray mold is determined according to each in-mold pressure value in the in-mold pressure sequence, the number and collection interval of the in-mold pressure values ​​in the in-mold pressure sequence, and the initial plastic liquid flow rate. In specific implementation, the first plastic liquid diffusion angle can be an inverse tangent function value of the ratio of the initial plastic liquid flow rate to the weighted mean of the in-mold pressure sequence, wherein the in-mold pressure values ​​can be weighted averaged according to the collection intervals corresponding to each in-mold pressure value to obtain the weighted mean of the in-mold pressure sequence. In some other embodiments, a preset proportional coefficient can be used to linearly scale the ratio of the initial plastic liquid flow rate to the weighted mean of the in-mold pressure sequence, and then the inverse tangent function can be input to obtain the function return value as the first plastic liquid diffusion angle.

[0059] In some embodiments, machine vision detection can also be used to take the ratio of the center plastic liquid height to the side wall plastic liquid height in the mobile phone card tray mold as the diffusion coefficient, and the return value of the inverse tangent function of the diffusion coefficient as the first plastic liquid diffusion angle.

[0060] In step S103, a set of infrared images of the mobile phone card tray plastic liquid in the mobile phone card tray mold is collected.

[0061] It should be noted that the set of infrared images of the mobile phone card tray plastic liquid can reflect the heat diffusion of the mobile phone card tray plastic liquid after entering the mobile phone card tray mold. In some embodiments, after injection molding is completed, an infrared camera located on the side of the mobile phone card tray mold can be used to collect infrared images of the mobile phone card tray plastic liquid at equal intervals to obtain the set of infrared images of the plastic liquid. In some other embodiments, an infrared thermal imager or other devices or equipment that can collect infrared images can also be used, which is not limited here.

[0062] In step S104, the temperature fault points of the plastic liquid infrared image set are extracted to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid.

[0063] It should be noted that the injection process of the mobile phone card tray can be regarded as the rheological process of the plastic liquid. Therefore, before the plastic melt is formed, the melt follows the laws of conservation of momentum and energy, and the continuity equation is applicable. That is, the plastic liquid is not constant temperature and stable before molding, but a complex and changeable flow process of the viscoelastic melt. Through the detection of thermal imaging equipment, it can be found that the lateral heat gradient of the mobile phone card tray plastic liquid is proportional to the heat change of the central plastic liquid, which shows that the diffusion process of the mobile phone card tray plastic liquid is that the heat of the high-temperature plastic liquid in the center diffuses to the low-temperature plastic liquid on both sides.

[0064] Preferably, in some embodiments, reference Figure 2 As shown in FIG. 1 , this figure is an exemplary flow chart of extracting temperature fault points of the plastic liquid infrared image set in some embodiments of the present application. Extracting temperature fault points of the plastic liquid infrared image set to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid can be achieved by the following steps:

[0065] In step S1041, differential processing is performed on the plastic liquid infrared image set to obtain a differential infrared image set;

[0066] In step S1042, a thermal diffusion feature enhanced image is determined according to the differential infrared image set;

[0067] In step S1043, temperature features are extracted from the thermal diffusion feature enhanced image to obtain temperature fault points and gradient temperature diffusion coefficients of the mobile phone card holder plastic liquid.

[0068] In a specific implementation, the process of performing differential processing on the plastic liquid infrared image set to obtain the differential infrared image set can be achieved by performing image differential processing on the temporally adjacent images in the plastic liquid infrared image set respectively, so as to obtain the differential infrared image set. Image differential processing refers to the process of subtracting the grayscale values ​​of pixels at the same position in two pictures of the same size and setting the negative values ​​in the grayscale values ​​to zero to obtain a new picture. It should be noted that the plastic liquid infrared images in the plastic liquid infrared image set reflect the internal temperature of the plastic liquid at different acquisition times, that is, the temperature at a certain place is positively correlated with the grayscale value of the plastic liquid infrared image at that place. The differential infrared images in the differential infrared image set reflect the temperature changes of the mobile phone card tray plastic liquid at different times and in different areas.

[0069] Optionally, in some embodiments, the process of determining the thermal diffusion feature enhanced image according to the differential infrared image set can firstly extract the temperature difference of pixels around each pixel in the differential image as a temperature gradient through the Sobel operator, and use the temperature gradient as the thermal diffusion feature, and then enhance the extracted thermal diffusion feature through a histogram equalization and filtering method to enhance the thermal diffusion feature in the image, and finally reconstruct the enhanced thermal diffusion feature with the original infrared image to obtain the final thermal diffusion feature enhanced image.

[0070] Preferably, according to the differential infrared image set, determining the thermal diffusion feature enhanced image can also be achieved by using the following steps:

[0071] Acquire each differential infrared image in the differential infrared image set;

[0072] The thermal diffusion feature enhanced image is determined according to the pixel grayscale value of each differential infrared image in the differential infrared image set, wherein the thermal diffusion feature enhanced image can be determined according to the following formula:

[0073]

[0074] in, is the gray value of the pixel in the ath row and the bth column in the thermal diffusion feature enhanced image, is the grayscale value of the pixel in the ath row and the bth column of the cth differential infrared image in the differential infrared image set, and Y is the number of differential infrared images in the differential infrared image set.

[0075] Preferably, in some embodiments, the temperature feature extraction of the thermal diffusion feature enhanced image to obtain the temperature fault point and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid can be achieved by the following steps:

[0076] Obtaining a preset fault threshold, and taking the pixel points in the thermal diffusion feature enhanced image whose grayscale values ​​are higher than the fault threshold as temperature fault points;

[0077] The grayscale values ​​of the neighboring pixels of the temperature fault point are obtained, and the gradient temperature diffusion coefficients corresponding to the respective temperature fault points are determined according to the grayscale values ​​of the temperature fault point and its neighboring pixels.

[0078] It should be noted that the temperature fault point is a characteristic point where the temperature characteristic changes more dramatically. Using the temperature fault point as a characteristic point for characteristic analysis can increase the accuracy of the analysis results. The gradient temperature diffusion coefficient is the ratio between the lateral temperature change and the longitudinal temperature change corresponding to the temperature fault point, which reflects the temperature diffusion direction gradient corresponding to the temperature fault point. The overall thermal diffusion direction of the mobile phone card holder plastic liquid can be analyzed based on the gradient temperature diffusion coefficient corresponding to each temperature fault point. In specific implementation, the grayscale value of the neighboring pixel points of the temperature fault point can be first obtained, and then the ratio of the lateral grayscale change ratio value to the longitudinal grayscale change ratio value of the neighboring pixel points of the temperature fault point can be used as the gradient temperature diffusion coefficient of the temperature fault point.

[0079] In step S105, a thermal diffusion analysis is performed based on the temperature fault point and the gradient temperature diffusion coefficient to obtain a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid.

[0080] It should be noted that the second plastic liquid diffusion angle is the overall directional characteristic of the heat diffusion of the mobile phone card holder plastic liquid during the injection molding process. In some embodiments, the temperature diffusion direction (the gradient temperature diffusion coefficient) reflected by each temperature fault point can be weighted and fused according to the relative position of each temperature fault point and the injection base point to obtain the overall directional characteristic of the heat diffusion of the mobile phone card holder plastic liquid (the second plastic liquid diffusion angle).

[0081] Preferably, in some embodiments, the thermal diffusion analysis is performed according to the temperature fault point and the gradient temperature diffusion coefficient, and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid is obtained by the following steps:

[0082] Obtain the image coordinates corresponding to each temperature fault point in the thermal diffusion feature enhanced image;

[0083] The gradient temperature diffusion coefficient corresponding to each temperature fault point;

[0084] Obtain the horizontal and vertical coordinates of the injection base point in the thermal diffusion feature enhancement image;

[0085] The second plastic liquid diffusion angle of the mobile phone card tray is determined according to the image coordinates corresponding to each temperature fault point, the gradient temperature diffusion coefficient corresponding to each temperature fault point, and the horizontal and vertical coordinates of the injection base point.

[0086] A specific embodiment of the present application for determining the second plastic liquid diffusion angle of the mobile phone card tray is given below: for any temperature fault point, the direction of the heat diffusion vector corresponding to the temperature fault point can be determined according to the image coordinates corresponding to the temperature fault point and the horizontal and vertical coordinates of the injection base point. For example, the injection base point is used as the starting point of the heat diffusion vector, and the temperature fault point is used as the end point of the heat diffusion vector to determine the vector direction. The length of the heat diffusion vector is determined according to the gradient temperature diffusion coefficient corresponding to the temperature fault point. For example, the gradient temperature diffusion coefficient is used as the length of the heat diffusion vector of the temperature fault point. Then, the heat diffusion vectors corresponding to each temperature fault point are determined in the same way, and the vector mean of all the heat diffusion vectors is used as the final heat diffusion characteristic vector. The angle between the heat diffusion characteristic vector and the plastic liquid injection direction is used as the second plastic liquid diffusion angle of the plastic liquid of the mobile phone card tray.

[0087] It should be noted that the injection base point is the image position of the injection point of the plastic liquid of the mobile phone card tray in the thermal diffusion feature enhanced image. According to the relative position of each temperature fault point and the injection base point, the temperature diffusion direction (the gradient temperature diffusion coefficient) reflected by each temperature fault point is weightedly fused. The weight ratio of the temperature diffusion direction at this location can be corrected according to the deviation between the heat diffusion direction and the plastic liquid transfer direction, thereby improving the accuracy of the second plastic liquid diffusion angle.

[0088] In step S106, the plastic liquid diffusion deviation is determined based on the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and the plastic liquid flow rate in the subsequent injection molding process is adjusted according to the plastic liquid diffusion deviation.

[0089] By using the Hele-Shaw flow model in the mold software to study the flow behavior of the plastic liquid in the mold cavity, it can be proved that at a higher flow rate of the plastic liquid, the temperature gradient in the cavity is smaller, while the pressure and shear rate are larger. Therefore, in the solidification molding process of the mobile phone CAT tray, it is more likely to cause uneven heat diffusion due to shear heat, resulting in local thermal decomposition or bubbles of the plastic after the mobile phone CAT tray is molded, affecting the processing quality of the mobile phone CAT tray. Therefore, in the continuous injection process of the mobile phone CAT tray, it is necessary to increase or decrease the plastic liquid discharge speed in the subsequent injection molding process according to whether there is abnormal heat diffusion phenomenon in the mobile phone CAT tray plastic liquid, so as to improve the processing quality of the mobile phone CAT tray injection molding.

[0090] It should be noted that the first plastic liquid diffusion angle reflects the diffusion direction of the plastic liquid, and the second plastic liquid diffusion angle reflects the thermal diffusion direction of the plastic liquid. Since the plastic liquid enters the mold from a high temperature state and quickly transfers heat to the surroundings during the diffusion process, its diffusion direction and the thermal diffusion direction should be consistent as a whole. For example, when the initial plastic liquid flow rate is increased, the liquid discharge rate is faster, the plastic liquid diffusion direction is basically consistent with the plastic liquid discharge direction, and the first plastic liquid diffusion angle is lower. At this time, the direction of thermal diffusion also changes with the plastic liquid diffusion direction. Therefore, when the angle deviation between the first plastic liquid diffusion angle and the second plastic liquid diffusion angle is too large, it indicates that there is abnormal thermal diffusion inside the plastic liquid due to excessive shear heat, that is, there may be factors affecting heat transfer such as thermal decomposition bubbles inside the plastic liquid. At this time, it is necessary to adjust the plastic liquid flow rate in the subsequent injection molding process according to the plastic liquid diffusion deviation, so as to avoid excessive shear heat caused by excessive plastic liquid flow rate, causing local thermal decomposition or bubbles in the plastic liquid inside the mobile phone card tray. Sub-surface damage.

[0091] In some embodiments, the difference between the first plastic liquid diffusion angle and the second plastic liquid diffusion angle can be multiplied by a preset proportional coefficient to obtain the plastic liquid diffusion deviation. In some other embodiments, the deviation ratio between the first plastic liquid diffusion angle and the second plastic liquid diffusion angle can also be used as the plastic liquid diffusion deviation. The plastic liquid diffusion deviation reflects the degree of deviation between the plastic liquid diffusion direction of the mobile phone card holder plastic liquid and the actual thermal diffusion direction. Therefore, the abnormal thermal diffusion degree of the mobile phone card holder plastic liquid during solidification can be detected based on the plastic liquid diffusion deviation.

[0092] In some embodiments, reference Figure 3 As shown, Figure 3 20 mobile phone card trays are randomly sampled from 1000 samples for destructive testing, and the sub-surface damage area of ​​the mobile phone card tray is obtained by reference to Figure 3 It can be seen that the greater the plastic liquid diffusion deviation is, the greater the deviation between the plastic liquid diffusion direction of the mobile phone card holder plastic liquid and the actual heat diffusion direction is, and the easier it is to produce sub-surface damage inside;

[0093] In some embodiments, reference Figure 4, this figure is a correlation coefficient diagram between the plastic liquid diffusion deviation and the internal sub-surface damage area of ​​the mobile phone card holder during the plastic liquid injection molding process at different temperatures in this application. This application adopts a method of obtaining sub-surface damage area data and plastic liquid diffusion deviation data at different plastic liquid temperatures for multiple times, and then determining the Pearson correlation coefficient between the data as the correlation coefficient. Within the typical injection molding temperature range of common plastic materials, the Pearson correlation coefficient between the plastic liquid diffusion deviation and the internal sub-surface damage area of ​​the mobile phone card holder is approximately between 0.7 and 1, indicating that there is a strong correlation between the plastic liquid diffusion deviation and the internal sub-surface damage area of ​​the mobile phone card holder. Therefore, the plastic liquid flow rate in the subsequent injection molding process can be adjusted according to the plastic liquid diffusion deviation, thereby avoiding a large amount of shear heat caused by excessively fast plastic liquid flow rate during the injection molding process, causing local thermal decomposition or bubbles in the plastic liquid inside the mobile phone card holder and other sub-surface damage, thereby improving the product quality of the mobile phone card holder during continuous injection molding.

[0094] In some embodiments, when the plastic liquid diffusion deviation is higher than a preset threshold, the plastic liquid flow rate in the subsequent injection molding process is reduced according to the plastic liquid diffusion deviation. In specific implementation, when the plastic liquid diffusion deviation is higher than the preset threshold, the plastic liquid diffusion deviation can be used as a correction coefficient for controlling the servo motor of the injection molding machine, thereby realizing the control of the plastic liquid flow rate in the subsequent injection molding process. For example, in specific implementation, the plastic liquid diffusion deviation can be input into a PLC (Programmable-Logic-Controller) controller. The PLC controller is equipped with a preset program control algorithm, which can output a control voltage to connect the servo motor of the injection molding machine according to the input signal (i.e., the plastic liquid diffusion deviation) to control the plastic liquid flow rate in the subsequent injection molding process. In some embodiments, a proportional-integral-differential control algorithm can be used as the program control algorithm of the PLC controller, wherein the proportional coefficient, integral coefficient and differential coefficient are calibrated as constants based on historical experience.

[0095] In addition, in another aspect of the present application, in some embodiments, the present application provides a mobile phone card tray continuous injection molding device, the device includes an injection molding control unit, reference Figure 5 , which is a schematic diagram of exemplary hardware and / or software of an injection molding control unit according to some embodiments of the present application. The injection molding control unit 200 includes: a data acquisition module 201, a processing module 202 and an injection molding control module 203, which are described as follows:

[0096] The data acquisition module 201, in some specific embodiments of the present application, is mainly used to perform injection molding on the mobile phone card tray mold according to a preset initial plastic liquid flow rate, and collect the inner pressure of the side wall of the mobile phone card tray mold during the injection molding process to obtain the inner side pressure sequence of the mold;

[0097] Processing module 202, in some specific embodiments of the present application, the processing module 202 is mainly used to determine the first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate;

[0098] In some embodiments, the processing module 202 is further used to collect a set of infrared images of the mobile phone card tray plastic liquid in the mobile phone card tray mold;

[0099] In some embodiments, the processing module 202 is further used to extract temperature fault points of the plastic liquid infrared image set to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid;

[0100] In some embodiments, the processing module 202 is further used to perform thermal diffusion analysis according to the temperature fault point and the gradient temperature diffusion coefficient to obtain a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid;

[0101] Injection molding control module 203. In some specific embodiments of the present application, the injection molding control module 203 is mainly used to determine the plastic liquid diffusion deviation based on the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and adjust the plastic liquid flow rate in the subsequent injection molding process according to the plastic liquid diffusion deviation.

[0102] The above describes in detail an example of a mobile phone card tray continuous injection molding method and device provided in an embodiment of the present application. It can be understood that in order to realize the above functions, the corresponding device includes a hardware structure and / or software module corresponding to executing each function.

[0103] Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in this document, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function in the application is executed in hardware or in a computer software-driven hardware manner depends on the specific application and design constraints of the technical solution. Therefore, professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0104] In addition, the present application also provides a computer terminal device, which includes a memory and a processor, wherein the memory stores a code, and the processor is configured to obtain the code and execute the above-mentioned mobile phone card tray continuous injection molding method.

[0105] In some embodiments, reference Figure 6, which is a schematic diagram of the structure of a computer terminal device for implementing a continuous injection molding method for a mobile phone card tray according to some embodiments of the present application. The continuous injection molding method for a mobile phone card tray in the above embodiment can be performed by Figure 6 The computer terminal device 300 shown in the figure is implemented, and the computer terminal device 300 includes at least one communication bus 301, a communication interface 302, a processor 303 and a memory 304.

[0106] The processor 303 can be a general-purpose central processing unit (CPU), an application-specific integrated circuit (ASIC) or one or more processors for controlling the execution of the mobile phone card tray continuous injection molding method in the present application.

[0107] The communication bus 301 may include a pathway for transmitting information between the above-mentioned components.

[0108] The memory 304 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, an optical disc storage (including a compressed optical disc, a laser disc, an optical disc, a digital versatile disc, a Blu-ray disc, etc.), a magnetic disk or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory 304 may exist independently and be connected to the processor 303 via the communication bus 301. The memory 304 may also be integrated with the processor 303.

[0109] The memory 304 is used to store the program code for executing the solution of the present application, and the execution is controlled by the processor 303. The processor 303 is used to execute the program code stored in the memory 304. The program code may include one or more software modules. The determination of the first plastic liquid diffusion angle in the above embodiment can be implemented by the processor 303 and one or more software modules in the program code in the memory 304.

[0110] The communication interface 302 uses any transceiver or other device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.

[0111] Optionally, the computer terminal device 300 may further include a power supply 305 for providing power to various devices or circuits in the real-time computer terminal device.

[0112] In a specific implementation, as an embodiment, a computer terminal device may include multiple processors, each of which may be a single-CPU processor or a multi-CPU processor. The processor here may refer to one or more devices, circuits, and / or processing cores for processing data (such as computer program instructions).

[0113] The above-mentioned computer terminal device may be a general-purpose computer terminal device or a dedicated computer terminal device. In a specific implementation, the computer terminal device may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device or an embedded device. The embodiment of the present application does not limit the type of computer terminal device.

[0114] In addition, in other aspects of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores at least one computer program, and the computer program is loaded and executed by a processor to implement the operations performed by the above-mentioned mobile phone card tray continuous injection molding method.

[0115] In summary, in a method and device for continuous injection molding of a mobile phone card tray disclosed in an embodiment of the present application, the mobile phone card tray mold is firstly injection molded according to a preset initial plastic liquid flow rate, and the internal pressure of the side wall of the mobile phone card tray mold is collected during the injection molding process to obtain a mold inner side pressure sequence, and the first plastic liquid diffusion angle of the mobile phone card tray mold is determined according to the mold inner side pressure sequence and the initial plastic liquid flow rate, and a plastic liquid infrared image set is collected, and temperature fault points are extracted according to the plastic liquid infrared image set to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card tray plastic, and thermal diffusion analysis is performed according to the temperature fault points and the gradient temperature diffusion coefficient to obtain the second plastic liquid diffusion angle of the mobile phone card tray plastic , the plastic liquid diffusion deviation is determined by the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and finally the plastic liquid flow rate in the subsequent injection molding process is adjusted according to the plastic liquid diffusion deviation. The application determines the plastic liquid diffusion deviation by the deviation between the plastic liquid diffusion direction and the thermal diffusion direction of the plastic liquid. The plastic liquid diffusion deviation is used to reflect the abnormal thermal diffusion of the mobile phone card tray plastic liquid. The plastic liquid flow rate is adjusted according to the plastic liquid diffusion deviation, which can reduce the shear heat generated in the subsequent injection molding process, avoid sub-surface damage caused by local overheating inside the mobile phone card tray during the injection molding process, and improve the processing quality of the mobile phone card tray injection molding process.

[0116] The above is only an embodiment of the present application, and the common knowledge such as the specific technical scheme or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical scheme of the present application, several modifications and improvements can be made, which should also be regarded as the scope of protection of the present application, and these will not affect the effect of the implementation of the present application and the practicality of the patent.

[0117] The scope of protection claimed by this application shall be based on the content of its claims. The specific implementation methods and other records in the specification can be used to interpret the content of the claims. Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include these modifications and variations.

Claims

1. A method for continuous injection molding of a mobile phone card tray, characterized in that: include: Injection molding is performed on the mobile phone card tray mold according to a preset initial plastic liquid flow rate, and during the injection molding process, the inner pressure of the side wall of the mobile phone card tray mold is collected to obtain an inner mold side pressure sequence; Determining a first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate; Collecting a set of infrared images of the mobile phone card tray plastic liquid in the mobile phone card tray mold; Extracting temperature fault points of the plastic liquid infrared image set to obtain temperature fault points and gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid; Performing thermal diffusion analysis according to the temperature fault point and the gradient temperature diffusion coefficient to obtain a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid; The plastic liquid diffusion deviation is determined by the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and the plastic liquid flow rate in the subsequent injection molding process is adjusted according to the plastic liquid diffusion deviation.

2. The method according to claim 1, characterized in that Determining the first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate specifically includes: Acquire each mold inner side pressure value in the mold inner side pressure sequence; Determining the number and collection interval of the mold inner side pressure values ​​in the mold inner side pressure sequence; Obtaining the initial plastic liquid flow rate; The first plastic liquid diffusion angle of the mobile phone card tray mold is determined according to each mold inner side pressure value in the mold inner side pressure sequence, the number and collection interval of the mold inner side pressure values ​​in the mold inner side pressure sequence, and the initial plastic liquid flow rate.

3. The method according to claim 1, characterized in that Extracting the temperature fault points of the plastic liquid infrared image set to obtain the temperature fault points and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid specifically includes: Performing differential processing on the plastic liquid infrared image set to obtain a differential infrared image set; Determining a thermal diffusion feature enhanced image according to the differential infrared image set; The temperature feature is extracted from the thermal diffusion feature enhanced image to obtain the temperature fault point and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid.

4. The method according to claim 3, characterized in that According to the differential infrared image set, determining the thermal diffusion feature enhanced image is achieved by the following steps: Acquire each differential infrared image in the differential infrared image set; The thermal diffusion feature enhanced image is determined according to the grayscale value of the pixel points of each differential infrared image in the differential infrared image set.

5. The method according to claim 3, characterized in that The temperature feature extraction is performed on the thermal diffusion feature enhanced image to obtain the temperature fault point and the gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid, specifically including: Obtaining a preset fault threshold, and taking the pixel points in the thermal diffusion feature enhanced image whose grayscale values ​​are higher than the fault threshold as temperature fault points; The grayscale values ​​of the neighboring pixels of the temperature fault point are obtained, and the gradient temperature diffusion coefficients corresponding to the respective temperature fault points are determined according to the grayscale values ​​of the temperature fault point and its neighboring pixels.

6. The method according to claim 1, characterized in that A screw pre-plasticizer is used to injection mold the mobile phone card tray mold.

7. The method according to claim 1, characterized in that The pressure sensor is used to collect the pressure inside the side wall of the mobile phone card tray mold at equal intervals to obtain the mold inner side pressure sequence.

8. A mobile phone card tray continuous injection molding device, characterized in that: An injection molding control unit is included, and the injection molding control unit includes: A data acquisition module is used to perform injection molding on the mobile phone card tray mold according to a preset initial plastic liquid flow rate, and collect the inner pressure of the side wall of the mobile phone card tray mold during the injection molding process to obtain an inner mold side pressure sequence; A processing module, used for determining a first plastic liquid diffusion angle of the mobile phone card tray mold according to the mold inner side pressure sequence and the initial plastic liquid flow rate; The processing module is further used to collect a set of infrared images of the mobile phone card tray plastic liquid in the mobile phone card tray mold; The processing module is further used to extract temperature fault points of the plastic liquid infrared image set to obtain the temperature fault points and gradient temperature diffusion coefficient of the mobile phone card holder plastic liquid; The processing module is further used to perform thermal diffusion analysis according to the temperature fault point and the gradient temperature diffusion coefficient to obtain a second plastic liquid diffusion angle of the mobile phone card tray plastic liquid; The injection molding control module is used to determine the plastic liquid diffusion deviation degree based on the first plastic liquid diffusion angle of the mobile phone card tray mold and the second plastic liquid diffusion angle of the mobile phone card tray plastic liquid, and adjust the plastic liquid flow rate in the subsequent injection molding process according to the plastic liquid diffusion deviation degree.

9. A computer terminal device, characterized in that: The computer terminal device includes a memory and a processor, the memory stores codes, and the processor is configured to obtain the codes and execute a mobile phone card tray continuous injection molding method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing at least one computer program, characterized in that: The computer program is loaded and executed by a processor to implement the operations performed by a mobile phone card tray continuous injection molding method as described in any one of claims 1 to 7.

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