A mold injection molding speed control method and system

Abstract

The present invention belongs to the technical field of mold injection molding, and discloses a mold injection molding speed control method and system; the method comprises: collecting comprehensive data, judging and processing the comprehensive data through an outlier formula to obtain preliminary stable data and preliminary outlier data, performing stable processing on the preliminary outlier data through a mapping formula to obtain comprehensive stable data; obtaining a mold injection molding stage according to the comprehensive stable data, and obtaining an initial injection speed according to the mold injection molding stage; performing mold injection molding using the initial injection speed, and obtaining an injection speed adjustment factor according to the comprehensive stable data, judging whether to adjust the initial injection speed through the injection speed adjustment factor, and completing mold injection molding according to the judgment result; in the process of mold injection molding, the injection speed is accurately adjusted and controlled, and the qualified rate of the injection molded product is further increased.

Description

Technical Field

[0001] The present invention relates to the technical field of mold injection molding, and more specifically, to a mold injection molding speed control method and system. Background Art

[0002] The patent application publication number CN115320051A discloses a control method for a plastic molding injection mold, which relates to the field of plastic molding technology, and in particular to a control method for a plastic molding injection mold. The temperature parameters obtained by multiple temperature sensors are used to determine whether the external environment temperature is too low, and to start the heating module to ensure that the temperature of the mold is not too low, thereby ensuring the normal progress of the injection molding process; or to determine whether the temperature change speed of the mold meets the requirements based on the external temperature and the mold temperature, thereby ensuring the yield rate of plastic parts.

[0003] However, during the injection molding process, including the initial rapid filling stage, the mid-term deceleration filling stage and the final low-speed filling stage, only the effect of temperature on injection molding was considered, and the injection speed was not accurately controlled, resulting in defects in the injection molded products and reducing the yield of plastic parts. During the switching process between the initial rapid filling stage, the mid-term deceleration filling stage and the final low-speed filling stage, the injection speed also switches accordingly. During the switching process of the injection speed, the cavity pressure and cavity temperature will change. The changes in the cavity pressure and cavity temperature directly affect the injection speed. The injection speed is not adjusted according to the changes in the cavity pressure and cavity temperature, resulting in flash, uneven surface and other problems in the injection molded products.

[0004] In view of this, the present invention proposes a mold injection molding speed control method and system to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art and to achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for controlling the speed of mold injection molding, comprising:

[0006] S1: Collect comprehensive data, judge and process the comprehensive data through the outlier formula to obtain preliminary stable data and preliminary outlier data, and perform stable processing on the preliminary outlier data through the mapping formula to obtain comprehensive stable data;

[0007] S2: obtaining the mold injection stage according to the comprehensive stable data, and obtaining the initial injection speed according to the mold injection stage;

[0008] S3: Use the initial injection speed for mold injection, and obtain the injection speed adjustment factor according to the comprehensive stable data, determine whether to adjust the initial injection speed through the injection speed adjustment factor, and complete the mold injection according to the determination result.

[0009] Further, the comprehensive data includes cavity data and injection molding data;

[0010] The mold cavity data includes mold cavity pressure, volume and temperature of air in the mold cavity;

[0011] The injection molding data includes the temperature and melt index of the molten plastic.

[0012] Furthermore, the method of obtaining preliminary stable data and preliminary outlier data by judging and processing the comprehensive data through the outlier formula includes:

[0013] Step A1: Obtain the judgment value of the cavity data at each time point according to the outlier formula.

[0014] but ;

[0015] in, is the index of the time point, is the number of time points, For the Cavity data at a time point, For the The next time point Cavity data at For the The previous time point Cavity data at For the The judgment value of the outlier formula at the time point, , , and All are adjustment coefficients;

[0016] Step A2: Setting the outlier threshold ,when When , the cavity data is abnormal, and the cavity data is recorded as preliminary outlier cavity data, and the preliminary outlier cavity data is processed smoothly using the mapping formula;

[0017] when When , the cavity data is normal, and this cavity data is recorded as the preliminary stable cavity data;

[0018] Step A3: Repeat steps A1 and A2 to process the injection molding data to obtain preliminary outlier injection molding data and preliminary stable injection molding data;

[0019] Step A4: Collect Initial stable cavity data and initial stable injection data at a time point, obtain initial stable data, collect The preliminary outlier cavity data and the preliminary outlier injection data at a time point are used to obtain the preliminary outlier data.

[0020] Furthermore, the method of performing smooth processing on the preliminary outlier data through the mapping formula to obtain comprehensive smooth data includes:

[0021] Step B1: Set the mapping formula as:

[0022] ;

[0023] in, For the The mapping cavity data at each time point, To take the middle value after ascending order, For the The next time point after the time point Cavity data at For the The time point before the previous time point Cavity data at;

[0024] Step B2: Use the mapped cavity data to replace the corresponding preliminary outlier cavity data to form preliminary stable data, re-judge the preliminary stable data using the outlier formula, remove the preliminary outlier cavity data marked again at the time point, calculate the new data value using the filling formula, and fill it into the corresponding time point, record it as the stable cavity data at the time point, and record the preliminary stable cavity data as the stable cavity data;

[0025] Fill formula: ; For the Fill in the data value output by the formula at each time point;

[0026] Step B3: Repeat steps B1 and B2 to process the preliminary outlier injection molding data and the preliminary stable injection molding data to obtain stable injection molding data;

[0027] Step B4: Collect The stable cavity data and stable injection data at each time point are combined to obtain comprehensive stable data.

[0028] Furthermore, the method of obtaining the mold injection stage according to the comprehensive stable data and obtaining the initial injection speed according to the mold injection stage includes:

[0029] Calculate the The ratio of the volume of air in the mold cavity to the volume of the mold cavity at a time point , and set the percentage threshold range ;

[0030] when When the mold injection stage is the initial rapid filling stage, the initial injection speed is set to ;

[0031] then The mold injection stage is the mid-term deceleration filling stage, and the initial injection speed is set to ;

[0032] then The mold injection stage is the final low-speed filling stage, and the initial injection speed is set to .

[0033] Further, the method of using the initial injection speed for mold injection molding, obtaining the injection speed adjustment factor according to the comprehensive stable data, judging whether to adjust the initial injection speed according to the injection speed adjustment factor, and completing the mold injection molding according to the judgment result includes:

[0034] The injection speed adjustment factor includes an injection speed adjustment coefficient, a pressure change parameter, a temperature change parameter and a temperature-pressure combination coefficient;

[0035] Step C1: In the initial rapid filling stage, the injection speed adjustment coefficient is obtained according to the cavity pressure, the temperature of the molten plastic and the melt index, and the injection speed adjustment coefficient threshold range is set. ;

[0036] when or When the initial injection speed Adjustment is made to perform mold injection molding in the initial rapid filling stage by adjusting the injection speed; For the Injection speed adjustment coefficient at each time point;

[0037] when When the initial injection speed is not Adjust the initial injection speed Perform mold injection during the initial rapid filling phase;

[0038] Step C2: During the mid-deceleration filling phase, adjust the injection speed to , get the injection speed adjustment to Start time and end time ;

[0039] according to arrive The cavity pressure change curve and molten plastic temperature change curve within a time period are used to determine whether the injection speed is Make adjustments and complete mold injection molding in the mid-term deceleration filling stage based on the judgment results;

[0040] The method for obtaining the cavity pressure change curve is to establish a blank coordinate system. The time points are sequentially filled into the abscissa of the blank coordinate system, the ordinate of the blank coordinate system is set as the mold cavity pressure, and the mold cavity pressure corresponding to the time point is filled into the blank coordinate system to draw a curve; the method for obtaining the molten plastic temperature change curve is the same as the mold cavity pressure change curve, and the ordinate is set to the temperature of the molten plastic;

[0041] Step C3: In the final low-speed filling stage, adjust the injection speed to , get the injection speed adjustment to Start time and end time ;

[0042] according to arrive The cavity pressure change curve and molten plastic temperature change curve within a time period are used to determine whether the injection speed is Adjustments are made and, based on the judgment results, the mold injection in the final low-speed filling stage is completed.

[0043] Furthermore, the initial injection speed Ways to make adjustments include:

[0044] when When the mold cavity pressure, the temperature of the molten plastic and the normalized results of the melt index are obtained, the mold cavity pressure, the temperature of the molten plastic, the normalized results of the melt index and the initial injection speed are obtained. Get the enlargement formula: ; By increasing the initial injection speed Make adjustments;

[0045] when When the mold cavity pressure, the temperature of the molten plastic, the normalized result of the melt index and the initial injection speed are Get the reduction formula: ; By reducing the initial injection speed Make adjustments;

[0046] in, is the initial injection speed Adjusted injection speed, For the The normalized result of the cavity pressure at a time point is: For the The normalized result of the temperature of the molten plastic at a time point, For the The normalized result of the melt index of the molten plastic at a time point, is the adjustment factor, is the initial injection speed Adjusted injection speed, is the adjustment factor.

[0047] Furthermore, according to arrive The cavity pressure change curve and molten plastic temperature change curve within a time period are used to determine whether the injection speed is Ways to make adjustments include:

[0048] when When the mold cavity pressure, the temperature of the molten plastic and the normalized results of the melt index are obtained, the mold cavity pressure, the temperature of the molten plastic, the normalized results of the melt index and the initial injection speed are obtained. Get the enlargement formula: , by increasing the initial injection speed Make adjustments;

[0049] when When the mold cavity pressure, the temperature of the molten plastic, the normalized result of the melt index and the initial injection speed are Get the reduction formula: , by reducing the initial injection speed Make adjustments;

[0050] in, is the initial injection speed Adjusted injection speed, For the The normalized result of the cavity pressure at a time point is: For the The normalized result of the temperature of the molten plastic at a time point, For the The normalized result of the melt index of the molten plastic at a time point, is the adjustment factor, is the initial injection speed Adjusted injection speed, Adjustment factor.

[0051] Furthermore, according to arrive The cavity pressure change curve and molten plastic temperature change curve within a time period are used to determine whether the injection speed is Ways to make adjustments include:

[0052] according to arrive The cavity pressure change curve and molten plastic temperature change curve within the time period are used to obtain the temperature-pressure combined coefficient ;

[0053] in, ; and is the adjustment coefficient, For The cavity pressure at For The cavity pressure at For The molten plastic temperature at For The molten plastic temperature at for arrive Cavity pressure change curve function within a time period, for arrive The temperature variation curve function of the molten plastic within a time period;

[0054] Obtain the standard temperature-pressure combination coefficient corresponding to the historical standard mold injection process and the standard injection speed in the final low-speed filling stage;

[0055] Compare the standard temperature-pressure combination coefficient with the temperature-pressure combination coefficient. If they are different, the injection speed will not be adjusted. Make adjustments using injection speed Perform the final low-speed filling stage of mold injection. If the injection speed is the same, Adjustments were made to use the standard injection speed for the final slow filling stage to perform mold injection during the final slow filling stage.

[0056] A mold injection molding speed control system, comprising:

[0057] Data collection module, used to collect comprehensive data;

[0058] A data processing module is used to process the comprehensive data to obtain comprehensive stable data;

[0059] A speed acquisition module is used to obtain the mold injection stage according to the comprehensive stable data, and obtain the initial injection speed according to the mold injection stage;

[0060] The mold injection molding module is used to perform mold injection molding using an initial injection speed, and obtain an injection speed adjustment factor based on comprehensive stable data, determine whether to adjust the initial injection speed through the injection speed adjustment factor, and complete mold injection molding based on the determination result.

[0061] The technical effects and advantages of a mold injection molding speed control method and system of the present invention are as follows:

[0062] Collect comprehensive data, judge and process the comprehensive data through the outlier formula to obtain preliminary stable data and preliminary outlier data, obtain outliers and normal values ​​in the comprehensive data, stabilize the preliminary outlier data through the mapping formula to obtain comprehensive stable data, remove and fill out outliers in the comprehensive data to make the comprehensive data more accurate, obtain the mold injection stage according to the comprehensive stable data, obtain the initial injection speed according to the mold injection stage, use the initial injection speed to perform mold injection, and obtain the injection speed adjustment factor according to the comprehensive stable data, judge whether to adjust the initial injection speed through the injection speed adjustment factor, complete the mold injection according to the judgment result, and accurately adjust the initial injection speed, so that the molded product is complete and flawless;

[0063] The mold injection process includes an initial rapid filling stage, a mid-term deceleration filling stage and a final low-speed filling stage. During the switching process among the initial rapid filling stage, the mid-term deceleration filling stage and the final low-speed filling stage, the injection speed also switches accordingly. During the switching process of the injection speed, the cavity pressure and cavity speed will change. The changes in the cavity pressure and cavity speed directly affect the injection speed. The injection speed is adjusted according to the changes in the cavity pressure and cavity speed, thereby achieving precise adjustment and control of the injection speed, making the molded products complete and flawless, and further increasing the qualified rate of the injection molded products. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 A schematic diagram of a mold injection molding speed control method of the present invention;

[0065] Figure 2 It is a schematic diagram of a mold injection molding speed control system of the present invention. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Example 1

[0068] See also Figure 1 As shown, a mold injection molding speed control method described in this embodiment includes:

[0069] S1: Collect comprehensive data, judge and process the comprehensive data through the outlier formula to obtain preliminary stable data and preliminary outlier data, and perform stable processing on the preliminary outlier data through the mapping formula to obtain comprehensive stable data;

[0070] S2: obtaining the mold injection stage according to the comprehensive stable data, and obtaining the initial injection speed according to the mold injection stage;

[0071] S3: Use the initial injection speed for mold injection, and obtain the injection speed adjustment factor according to the comprehensive stable data, determine whether to adjust the initial injection speed through the injection speed adjustment factor, and complete the mold injection according to the determination result.

[0072] The process of collecting comprehensive data includes:

[0073] The comprehensive data includes mold cavity data and injection molding data;

[0074] The mold cavity data includes mold cavity pressure, volume and temperature of air in the mold cavity, and the injection molding data includes temperature and melt index of molten plastic;

[0075] The mold cavity pressure is obtained through a pressure sensor, the temperature of the air in the mold cavity and the temperature of the molten plastic are obtained through a temperature sensor, the total volume of the mold cavity is obtained through a CAD model, and the volume of the molten plastic injected into the mold cavity is obtained in real time. The volume of the air in the mold cavity is obtained by subtracting the volume of the molten plastic injected into the mold cavity from the total volume of the mold cavity. The plastic sample is placed in the heating cylinder of the melt index meter. In the molten state, pressure is applied to the sample by a weight of G_1 kg, so that the plastic sample in the molten state flows out through a small hole with a diameter of G_2 mm. The mass of the flowing plastic sample is measured within G_3 time to obtain the melt index of the molten plastic.

[0076] Methods for obtaining preliminary stable data and preliminary outlier data by judging and processing comprehensive data through outlier formulas include:

[0077] Step A1: Obtain the judgment value of the cavity data at each time point according to the outlier formula.

[0078] but ;

[0079] in, is the index of the time point, is the number of time points, For the Cavity data at a time point, For the The next time point Cavity data at For the The previous time point of a time point Cavity data at For the The judgment value of the outlier formula at the time point, , , and All are adjustment coefficients;

[0080] Step A2: Setting the outlier threshold ,when When , the cavity data is abnormal, and the cavity data is recorded as preliminary outlier cavity data, and the preliminary outlier cavity data is processed smoothly using the mapping formula;

[0081] when When , the cavity data is normal, and this cavity data is recorded as the preliminary stable cavity data;

[0082] Step A3: Repeat steps A1 and A2 to process the injection molding data to obtain preliminary outlier injection molding data and preliminary stable injection molding data;

[0083] Step A4: Collect Initial stable cavity data and initial stable injection data at a time point, obtain initial stable data, collect The preliminary outlier cavity data and the preliminary outlier injection data at a time point are used to obtain the preliminary outlier data.

[0084] Methods for stabilizing preliminary outlier data by mapping formulas to obtain comprehensive stable data include:

[0085] Step B1: Set the mapping formula as:

[0086] ;

[0087] in, For the The mapping cavity data at each time point, To take the middle value after ascending order, For the The next time point after the time point Cavity data at For the The time point before the previous time point Cavity data at;

[0088] Step B2: Use the mapped cavity data to replace the corresponding preliminary outlier cavity data to form preliminary stable data, re-judge the preliminary stable data using the outlier formula, remove the preliminary outlier cavity data marked again at the time point, calculate the new data value using the filling formula, and fill it into the corresponding time point, record it as the stable cavity data at the time point, and record the preliminary stable cavity data as the stable cavity data;

[0089] Fill formula: ; For the Fill in the data value output by the formula at each time point;

[0090] Step B3: Repeat steps B1 and B2 to process the preliminary outlier injection molding data and the preliminary stable injection molding data to obtain stable injection molding data;

[0091] Step B4: Collect The stable cavity data and stable injection data at each time point are combined to obtain comprehensive stable data.

[0092] The method of obtaining the mold injection stage according to the comprehensive stable data and obtaining the initial injection speed according to the mold injection stage includes:

[0093] Get the cavity volume , calculate the The ratio of the volume of air in the mold cavity to the volume of the mold cavity at a time point ;

[0094] in, ; For the The volume of air in the mold cavity at a point in time;

[0095] Obtaining a mold injection stage according to the air volume ratio, wherein the mold injection stage includes an initial fast filling stage, a mid-term deceleration filling stage, and a final slow filling stage;

[0096] Set the air volume percentage threshold range ;

[0097] The mold injection stage is obtained according to the comparison result between the air volume ratio and the air volume ratio threshold range;

[0098] when When the mold is injected, it is the initial rapid filling stage;

[0099] when When , the mold injection stage is the mid-term deceleration filling stage;

[0100] when When , the mold injection stage is the final low-speed filling stage;

[0101] When the mold injection stage is the initial rapid filling stage, set the initial injection speed to , when the mold injection stage is the mid-term deceleration filling stage, set the initial injection speed to , when the mold injection stage is the final low-speed filling stage, set the initial injection speed to ;

[0102] in, ;

[0103] It needs to be explained that during the initial rapid filling stage, a higher injection speed is used for filling to shorten the molding cycle and reduce material cooling; during the mid-term deceleration filling stage, the mold cavity is close to saturation, and the speed is reduced to reduce flow resistance, while preventing the molten plastic from flowing back in the mold, so that the molten plastic can smoothly fill the complex parts of the mold cavity and reduce internal bubbles and uneven filling; during the final low-speed filling stage, the injection speed is reduced to a lower level to ensure that the mold cavity is filled smoothly without violent flow, effectively preventing the molten plastic from over-punching the mold and causing flash, and avoiding excessive pressure in the mold cavity that may cause mold damage.

[0104] The method of performing mold injection molding by using the initial injection speed, obtaining the injection speed adjustment factor according to the comprehensive stable data, judging whether to adjust the initial injection speed according to the injection speed adjustment factor, and completing the mold injection molding according to the judgment result includes:

[0105] The injection speed adjustment factor includes an injection speed adjustment coefficient, a pressure change parameter, a temperature change parameter and a temperature-pressure combination coefficient;

[0106] In the initial rapid filling stage, the temperature of the air in the mold cavity is compared with the temperature of the molten plastic. If the temperature of the air in the mold cavity is the same as the temperature of the molten plastic, the initial injection speed is used. During mold injection, if the temperature of the air in the mold cavity is different from the temperature of the molten plastic, the mold cavity is heated until the temperature of the air in the mold cavity is the same as the temperature of the molten plastic. The initial injection speed is used. Perform mold injection molding;

[0107] The injection speed adjustment coefficient is obtained based on the cavity pressure, the temperature of the molten plastic and the melt index. ;

[0108] in, ; , , , , , , , , and are adjustment factors, For the The cavity pressure at a time point, For the The temperature of the molten plastic at a point in time, is the melt index of the molten plastic, For the Injection speed adjustment coefficient at each time point;

[0109] Set the injection speed adjustment coefficient threshold range ;

[0110] Determine whether the initial injection speed is adjusted based on the comparison result between the injection speed adjustment coefficient and the injection speed adjustment coefficient threshold range. Make adjustments;

[0111] when When the initial injection speed Adjustment is made to perform mold injection molding in the initial rapid filling stage by adjusting the injection speed;

[0112] when When the initial injection speed is not Adjust the initial injection speed Perform mold injection during the initial rapid filling phase;

[0113] when When the initial injection speed Adjustment is made to perform mold injection molding in the initial rapid filling stage by adjusting the injection speed;

[0114] When the injection speed adjustment coefficient is less than or equal to the minimum value in the injection speed adjustment coefficient threshold range, the initial injection speed The process of making adjustments includes:

[0115] Obtain normalized results of cavity pressure, temperature of molten plastic and melt index;

[0116] ; ;

[0117] ; and are positive numbers and , For the The normalized result of the cavity pressure at a time point is: For the The normalized result of the temperature of the molten plastic at a time point, For the Normalized result of the melt index of the molten plastic at a time point;

[0118] Based on the cavity pressure, molten plastic temperature, normalized result of melt index and initial injection speed Get the enlargement formula: ; By increasing the initial injection speed Make adjustments;

[0119] in, is the initial injection speed Adjusted injection speed, is the adjustment factor;

[0120] When the injection speed adjustment coefficient is greater than or equal to the maximum value in the injection speed adjustment coefficient threshold range, the initial injection speed The process of making adjustments includes:

[0121] Based on the cavity pressure, molten plastic temperature, normalized result of melt index and initial injection speed Get the reduction formula: ; By reducing the initial injection speed Make adjustments;

[0122] in, is the initial injection speed Adjusted injection speed, is the adjustment factor;

[0123] During the mid-deceleration filling phase, adjust the injection speed to , get the injection speed adjustment to Start time and end time ;

[0124] It should be explained that the injection speed is adjusted to The start time is adjusted from the injection speed of the initial rapid filling stage to The start time of injection is adjusted to The end time is when the injection speed becomes time;

[0125] according to arrive The cavity pressure change curve and molten plastic temperature change curve within the time period are used to obtain the pressure change parameters. and temperature variation parameters ;

[0126] The method for obtaining the cavity pressure change curve is to establish a blank coordinate system. The time points are sequentially filled into the abscissa of the blank coordinate system, the ordinate of the blank coordinate system is set as the mold cavity pressure, and the mold cavity pressure corresponding to the time point is filled into the blank coordinate system to draw a curve; the method for obtaining the molten plastic temperature change curve is the same as the mold cavity pressure change curve, and the ordinate is set to the temperature of the molten plastic;

[0127] in, ; for arrive Cavity pressure change curve function within a time period, for arrive The temperature variation curve function of the molten plastic within a time period, represents the time independent variable;

[0128] Obtain standard pressure change parameters, standard temperature change parameters and standard injection speed of the mid-term deceleration filling stage corresponding to the historical standard mold injection process;

[0129] It should be explained that if the product molded by the historical mold injection molding process is a qualified product, that is, a product that can be put into use, the historical mold injection molding process will be recorded as the historical standard mold injection molding process;

[0130] Obtain the absolute value of the pressure change parameter subtracted from the standard pressure change parameter and the absolute value of the temperature change parameter subtracted from the standard temperature change parameter, add the two subtracted absolute values ​​to obtain the difference coefficient, obtain the historical standard mold injection molding process corresponding to the minimum difference coefficient, and compare the standard injection speed and injection speed of the mid-term deceleration filling stage corresponding to this historical standard mold injection molding process. Make comparisons;

[0131] If the comparison results are the same, the injection speed is not adjusted. Adjust the injection speed Perform mold injection during the mid-term deceleration filling phase. If the comparison results are different, adjust the injection speed. Adjustment is made to perform mold injection molding in the mid-term deceleration filling stage by using the standard injection speed in the mid-term deceleration filling stage;

[0132] In the final slow filling stage, adjust the injection speed to , get the injection speed adjustment to Start time and end time ;

[0133] according to arrive The cavity pressure change curve and molten plastic temperature change curve within the time period are used to obtain the temperature-pressure combined coefficient ;

[0134] in, ; and is the adjustment coefficient, For The cavity pressure at For The cavity pressure at For The molten plastic temperature at For The molten plastic temperature at for arrive Cavity pressure change curve function within a time period, for arrive The temperature variation curve function of the molten plastic within a time period;

[0135] Obtain the standard temperature-pressure combination coefficient corresponding to the historical standard mold injection process and the standard injection speed in the final low-speed filling stage;

[0136] Compare the standard temperature-pressure combination coefficient with the temperature-pressure combination coefficient. If they are different, the injection speed will not be adjusted. Make adjustments using injection speed Perform the final low-speed filling stage of mold injection. If the injection speed is the same, Adjustments were made to use the standard injection speed for the final slow filling stage to perform mold injection during the final slow filling stage.

[0137] In this embodiment, the mold injection process includes an initial rapid filling stage, a mid-term deceleration filling stage and a final low-speed filling stage. During the switching process among the initial rapid filling stage, the mid-term deceleration filling stage and the final low-speed filling stage, the injection speed also switches accordingly. During the switching process of the injection speed, the cavity pressure and the cavity speed will change. The changes in the cavity pressure and the cavity speed directly affect the injection speed. The injection speed is adjusted according to the changes in the cavity pressure and the cavity speed, thereby achieving precise adjustment and control of the injection speed, so that the molded products are complete and flawless, further increasing the qualified rate of the injection molded products.

[0138] Example 2

[0139] See also Figure 2 As shown, the part not described in detail in this embodiment can be seen from the description of embodiment 1, which provides a mold injection molding speed control system, including:

[0140] Data collection module, used to collect comprehensive data;

[0141] A data processing module is used to process the comprehensive data to obtain comprehensive stable data;

[0142] A speed acquisition module is used to obtain the mold injection stage according to the comprehensive stable data, and obtain the initial injection speed according to the mold injection stage;

[0143] The mold injection molding module is used to perform mold injection molding using an initial injection speed, and obtain an injection speed adjustment factor based on comprehensive stable data, determine whether to adjust the initial injection speed through the injection speed adjustment factor, and complete mold injection molding based on the determination result.

[0144] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. 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 the present invention.

[0145] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only one, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0146] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0147] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling mold injection molding speed, characterized in that: The mold injection molding speed control method comprises: S1: Collect comprehensive data, judge and process the comprehensive data through the outlier formula to obtain preliminary stable data and preliminary outlier data, and perform stable processing on the preliminary outlier data through the mapping formula to obtain comprehensive stable data; S2: obtaining the mold injection stage according to the comprehensive stable data, and obtaining the initial injection speed according to the mold injection stage; S3: Use the initial injection speed to perform mold injection, and obtain the injection speed adjustment factor according to the comprehensive stable data, determine whether to adjust the initial injection speed according to the injection speed adjustment factor, and complete the mold injection according to the determination result; The comprehensive data includes mold cavity data and injection molding data; The mold cavity data includes mold cavity pressure, volume and temperature of air in the mold cavity; The injection molding data include the temperature and melt index of the molten plastic; Methods for obtaining the initial injection velocity include: Calculate the The ratio of the volume of air in the mold cavity to the volume of the mold cavity at a time point , and set the percentage threshold range ; when When the mold injection stage is the initial rapid filling stage, the initial injection speed is set to ; when When the mold injection stage is the mid-term deceleration filling stage, the initial injection speed is set to ; when When the mold injection stage is the final low-speed filling stage, the initial injection speed is set to ; The methods for completing mold injection molding according to the judgment results include: The injection speed adjustment factor includes an injection speed adjustment coefficient, a pressure change parameter, a temperature change parameter and a temperature-pressure combination coefficient; Step C1: In the initial rapid filling stage, the injection speed adjustment coefficient is obtained according to the cavity pressure, the temperature of the molten plastic and the melt index, and the injection speed adjustment coefficient threshold range is set. ; For the Injection speed adjustment coefficient at each time point; when When the mold cavity pressure, the temperature of the molten plastic and the normalized results of the melt index are obtained, the mold cavity pressure, the temperature of the molten plastic, the normalized results of the melt index and the initial injection speed are obtained. Get the enlargement formula: ; By increasing the initial injection speed Make adjustments; when When the mold cavity pressure, the temperature of the molten plastic, the normalized result of the melt index and the initial injection speed are Get the reduction formula: ; By reducing the initial injection speed Make adjustments; in, is the initial injection speed Adjusted injection speed, For the The normalized result of the cavity pressure at a time point is: For the The normalized result of the temperature of the molten plastic at a time point, For the The normalized result of the melt index of the molten plastic at a time point, is the adjustment factor, is the initial injection speed Adjusted injection speed, is the adjustment factor; Step C2: During the mid-deceleration filling phase, adjust the injection speed to , get the injection speed adjustment to Start time and end time ; according to arrive The cavity pressure change curve and molten plastic temperature change curve within a time period are used to determine whether the injection speed is Make adjustments and complete the mold injection molding in the mid-term deceleration filling stage according to the judgment results, including: according to arrive The cavity pressure change curve and molten plastic temperature change curve within the time period are used to obtain the pressure change parameters. and temperature variation parameters ; in, ; ; for arrive Cavity pressure change curve function within a time period, for arrive The temperature variation curve function of the molten plastic within a time period, represents the time independent variable; Obtain standard pressure change parameters, standard temperature change parameters and standard injection speed of the mid-term deceleration filling stage corresponding to the historical standard mold injection process; Obtain the absolute value of the pressure change parameter subtracted from the standard pressure change parameter and the absolute value of the temperature change parameter subtracted from the standard temperature change parameter, add the two subtracted absolute values ​​to obtain the difference coefficient, obtain the historical standard mold injection molding process corresponding to the minimum difference coefficient, and compare the standard injection speed and injection speed of the mid-term deceleration filling stage corresponding to this historical standard mold injection molding process. Make comparisons; If the comparison results are the same, the injection speed is not adjusted. Adjust the injection speed Perform mold injection during the mid-term deceleration filling phase. If the comparison results are different, adjust the injection speed. Adjustment is made to perform mold injection molding in the mid-term deceleration filling stage by using the standard injection speed in the mid-term deceleration filling stage; Step C3: In the final low-speed filling stage, adjust the injection speed to , get the injection speed adjustment to Start time and end time ; according to arrive The cavity pressure change curve and molten plastic temperature change curve within a time period are used to determine whether the injection speed is Make adjustments and complete the mold injection in the final low-speed filling stage based on the judgment results, including: according to arrive The cavity pressure change curve and molten plastic temperature change curve within the time period are used to obtain the temperature-pressure combined coefficient ; in, ; and is the adjustment coefficient, For The cavity pressure at For The cavity pressure at For The molten plastic temperature at For The molten plastic temperature at for arrive Cavity pressure change curve function within a time period, for arrive The temperature variation curve function of the molten plastic within a time period; Obtain the standard temperature-pressure combination coefficient corresponding to the historical standard mold injection process and the standard injection speed in the final low-speed filling stage; Compare the standard temperature-pressure combination coefficient with the temperature-pressure combination coefficient. If they are different, the injection speed will not be adjusted. Make adjustments using injection speed Perform the final low-speed filling stage of mold injection. If the injection speed is the same, Adjustments were made to use the standard injection speed for the final slow filling stage to perform mold injection during the final slow filling stage.

2. A method for controlling mold injection molding speed according to claim 1, characterized in that: The method of obtaining preliminary stable data and preliminary outlier data by judging and processing the comprehensive data through the outlier formula includes: Step A1: Obtain the judgment value of the cavity data at each time point according to the outlier formula. but ; in, is the index of the time point, is the number of time points, For the Cavity data at a time point, For the The next time point Cavity data at For the The previous time point of a time point Cavity data at For the The judgment value of the outlier formula at the time point, , , and All are adjustment coefficients; Step A2: Setting the outlier threshold ,when When , the cavity data is abnormal, and the cavity data is recorded as preliminary outlier cavity data, and the preliminary outlier cavity data is processed smoothly using the mapping formula; when When , the cavity data is normal, and this cavity data is recorded as the preliminary stable cavity data; Step A3: Repeat steps A1 and A2 to process the injection molding data to obtain preliminary outlier injection molding data and preliminary stable injection molding data; Step A4: Collect Initial stable cavity data and initial stable injection data at a time point, obtain initial stable data, collect The preliminary outlier cavity data and the preliminary outlier injection data at a time point are used to obtain the preliminary outlier data.

3. A method for controlling mold injection molding speed according to claim 2, characterized in that: The method of performing smooth processing on the preliminary outlier data by using a mapping formula to obtain comprehensive smooth data includes: Step B1: Set the mapping formula as: ； in, For the The mapping cavity data at each time point, To take the middle value after ascending order, For the The next time point after the time point Cavity data at For the The time point before the previous time point Cavity data at; Step B2: Use the mapped cavity data to replace the corresponding preliminary outlier cavity data to form preliminary stable data, re-judge the preliminary stable data using the outlier formula, remove the preliminary outlier cavity data marked again at the time point, calculate the new data value using the filling formula, and fill it into the corresponding time point, record it as the stable cavity data at the time point, and record the preliminary stable cavity data as the stable cavity data; Fill formula: ; For the Fill in the data value output by the formula at each time point; Step B3: Repeat steps B1 and B2 to process the preliminary outlier injection molding data and the preliminary stable injection molding data to obtain stable injection molding data; Step B4: Collect The stable cavity data and stable injection data at each time point are combined to obtain comprehensive stable data.

4. A method for controlling mold injection molding speed according to claim 3, characterized in that: when or When the initial injection speed Adjustment is made to perform mold injection molding in the initial rapid filling stage by adjusting the injection speed; when When the initial injection speed is not Adjust the initial injection speed Performs initial rapid filling phase of mold injection.

5. A method for controlling mold injection molding speed according to claim 4, characterized in that: The method for obtaining the cavity pressure variation curve diagram includes: Create a blank coordinate system. The time points are filled into the horizontal coordinate of the blank coordinate system in sequence, the vertical coordinate of the blank coordinate system is set to the cavity pressure, and the cavity pressure corresponding to the time point is filled into the blank coordinate system to draw a curve; the method for obtaining the molten plastic temperature change curve is the same as the cavity pressure change curve, and the vertical coordinate is set to the temperature of the molten plastic.

6. A mold injection molding speed control system, which is used to implement a mold injection molding speed control method according to any one of claims 1 to 5, characterized in that: include: Data collection module, used to collect comprehensive data; A data processing module is used to process the comprehensive data to obtain comprehensive stable data; A speed acquisition module is used to obtain the mold injection stage according to the comprehensive stable data, and obtain the initial injection speed according to the mold injection stage; The mold injection molding module is used to perform mold injection molding using an initial injection speed, and obtain an injection speed adjustment factor based on comprehensive stable data, determine whether to adjust the initial injection speed through the injection speed adjustment factor, and complete mold injection molding based on the determination result.

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