A temperature-based injection mold production control method and system

Abstract

This invention relates to the field of injection mold manufacturing technology, specifically to a temperature-based injection mold manufacturing control method and system, comprising: acquiring injection molded part dimensional data and calculating the injection molded part thickness risk value; determining the impact of injection molded part thickness on injection molded part quality based on the injection molded part thickness risk value and generating an injection molded part thickness signal; acquiring injection molded part temperature data based on the injection molded part thickness non-compliance signal and calculating the overlap rate of abnormal monitoring points; generating an injection molded part cooling rate correlation signal based on the overlap rate of abnormal monitoring point signals; acquiring injection molded part monitoring point data based on the pre-existing correlation signal of injection molded part cooling rate and generating a cooling rate correlation strength signal; acquiring injection molded part thickness data and injection molded part cooling data based on the large correlation signal of injection molded part cooling rate, and calculating the flow rate control value of the heat pipe cooling medium; this invention optimizes the cooling rate of the injection molded part during the injection molding process and improves the pass rate of the injection molded part.

Description

Technical Field

[0001] The invention relates to the technical field of injection mold production, and in particular to a temperature-based injection mold production control method and system. Background Art

[0002] Injection mold production is one of the important processes in the production of plastic products. The molten plastic is injected into the mold by an injection molding machine, and the desired plastic product is obtained after cooling and solidification. The precision and quality of the injection mold directly affect the performance and appearance of the final product.

[0003] During the injection mold production process, the cooling speed of the injection molded product directly affects the deformation and dimensional accuracy of the product; rapid cooling can reduce the deformation of the product caused by thermal stress, thereby improving the dimensional accuracy of the product; however, if the cooling speed is too fast, it will also cause excessive internal stress in the injection molded product, which will increase the risk of deformation and cause the injection molded product to fail to meet the qualified standards. Summary of the invention

[0004] The object of the present invention is to provide a temperature-based injection mold production control method to solve the above-mentioned background problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A temperature-based injection mold production control method comprises the following steps:

[0007] Step 1: Obtain the injection molded part dimension data and calculate the injection molded part thickness risk value; wherein the injection molded part dimension data includes the injection molded part thickness value;

[0008] Step 2: According to the risk value of the thickness of the injection molded part, determine the influence of the thickness of the injection molded part on the quality of the injection molded part, and generate an injection molded part thickness signal; wherein the thickness evaluation signal includes an injection molded part thickness unqualified signal and an injection molded part thickness qualified signal;

[0009] Step 3: Based on the unqualified signal of the injection molded part thickness, the injection molded part temperature data is obtained, and the coincidence rate of the abnormal monitoring points is calculated; wherein the injection molded part data includes the injection molded part temperature value;

[0010] Step 4: according to the overlap rate of abnormal signals at the monitoring points, determine the influence of the cooling speed of the injection molded part on the thickness of the injection molded part, and generate a cooling speed correlation signal of the injection molded part; wherein the cooling speed correlation signal of the injection molded part includes a cooling speed pre-correlation signal of the injection molded part and a cooling speed non-correlation signal of the injection molded part;

[0011] Step 5: Based on the pre-correlation signal of the injection molded part cooling speed, the injection molded part monitoring point data is obtained, the strength of the correlation between the injection molded part thickness and the cooling speed is determined, and a cooling speed correlation strength signal is generated; wherein the monitoring point data includes the monitoring point thickness deviation value and the monitoring point cooling difference speed, and the cooling speed correlation strength signal includes a cooling speed correlation large signal and a cooling speed correlation small signal;

[0012] Step six: Based on the large signal associated with the cooling speed of the injection molded part, the injection molded part thickness data and the injection molded part cooling data are obtained, and the flow speed control value of the heat pipe cooling medium is calculated; wherein, the injection molded part thickness data includes the thickness deviation value of the injection molded part monitoring point, and the injection molded part temperature data includes the cooling speed difference of the injection molded part monitoring point.

[0013] As a further solution of the present invention: in step 1, a plurality of monitoring points are evenly set on the injection molded part, and the thickness value of the injection molded part at each monitoring point is obtained;

[0014] The thickness value of a single monitoring point is calculated by absolute difference with the thickness value of the same position of the standard injection molded part to obtain the thickness deviation value of the monitoring point;

[0015] The variance of the thickness deviation values ​​of all monitoring points is calculated to obtain the thickness deviation fluctuation value of the monitoring points;

[0016] Compare the thickness deviation value of the monitoring point with the production error value;

[0017] When the thickness deviation value of the monitoring point is greater than or equal to the production error value, a thickness abnormality signal of the monitoring point is generated.

[0018] As a further solution of the present invention: in step 1, the number of abnormal thickness signals at the monitoring points is obtained, and the ratio of the obtained number of abnormal thickness signals at the monitoring points to the total number of monitoring points is calculated to obtain the abnormal number ratio of the monitoring points;

[0019] By formula , the injection molded part thickness risk value F is calculated; where B represents the thickness deviation fluctuation value of the monitoring point, M represents the abnormal number ratio of the monitoring point, a and b are both proportional coefficients, and a+b=1.

[0020] As a further solution of the present invention: in step 2, a thickness risk value is obtained, and the thickness risk value is compared with a thickness risk threshold;

[0021] If the thickness risk value is greater than or equal to the thickness risk threshold, a thickness failure signal is generated.

[0022] As a further solution of the present invention: in step three, the temperature change rate of the injection molded part at each monitoring point during the injection molded part production cycle is obtained and marked as the cooling rate of the monitoring point;

[0023] The difference between the cooling speed of the monitoring point and the cooling speed of the standard injection molded part is calculated to obtain the cooling difference speed of the monitoring point;

[0024] comparing the cooling difference speed of the monitoring point with the cooling difference speed threshold of the monitoring point;

[0025] If the cooling difference speed of the monitoring point is greater than or equal to the cooling difference speed threshold of the monitoring point, a cooling abnormality signal of the monitoring point is generated;

[0026] If the monitoring point cooling difference speed is less than the monitoring point cooling difference speed threshold, a monitoring point cooling normal signal is generated.

[0027] As a further solution of the present invention: in step three, a two-dimensional coordinate model is established with the width of the injection molded part as the X-axis and the height as the Y-axis, and a plurality of monitoring points of the injection molded part are substituted into the coordinate system;

[0028] Substituting the monitoring point generating the cooling abnormality signal into the two-dimensional coordinate system model to form a distribution diagram of the cooling abnormality signal at the monitoring point;

[0029] Substitute the monitoring point that generates the abnormal thickness signal into the two-dimensional coordinate system model to form a distribution diagram of the abnormal thickness signal of the monitoring point;

[0030] Traverse the coordinates of the two-dimensional coordinate system to obtain the repeated coordinates of the abnormal signal;

[0031] The number of repeated coordinates is obtained, and the ratio of the number of repeated coordinates to the total number of coordinates is calculated to obtain the coordinate coincidence rate, which is marked as the abnormal signal coincidence rate of the monitoring point.

[0032] The traversal method is:

[0033] A judgment is made based on the number of abnormal signals at each coordinate. If the number of abnormal signals at the coordinate is two, the coordinate is marked as a coordinate with repeated abnormal signals.

[0034] As a further solution of the present invention: in step 4, the monitoring point abnormal signal overlap rate is obtained, and the monitoring point abnormal signal overlap rate is compared with the monitoring point abnormal signal overlap rate threshold;

[0035] If the monitoring point abnormal signal overlap rate is greater than or equal to the monitoring point abnormal signal overlap rate threshold, a cooling speed pre-correlation signal of the injection molded part is generated;

[0036] If the overlap rate of abnormal signals at the monitoring points is less than the threshold of the overlap rate of abnormal signals at the monitoring points, a signal having no correlation with the cooling speed of the injection molded part is generated.

[0037] As a further solution of the present invention: in step 5, the thickness deviation value and the cooling differential speed of the monitoring point are obtained, and the thickness deviation value and the cooling differential speed of the monitoring point of the injection molded part are calculated to obtain the ratio of the thickness deviation value to the cooling differential speed, which is marked as the thickness-cooling ratio;

[0038] Calculate the variance of the thickness-to-cooling ratio of all monitoring points to obtain the thickness-to-cooling ratio fluctuation value;

[0039] Setting a thickness ratio fluctuation threshold, and comparing the thickness ratio fluctuation value with the thickness ratio fluctuation threshold;

[0040] If the thickness ratio fluctuation value is less than the thickness ratio fluctuation threshold, a large signal related to the cooling speed of the injection molded part is generated.

[0041] As a further solution of the present invention: in step six, the thickness deviation value and cooling difference speed of the monitoring point where the abnormal signal of the injection molded part overlaps are obtained;

[0042] It should be noted that the overlapped part of the abnormal monitoring points of the injection molded parts indicates that the thickness deviation value and cooling difference speed of the monitoring point are abnormal;

[0043] The thickness deviation values ​​of all monitoring points of historical injection molded parts are averaged to obtain the thickness deviation mean of the monitoring points of historical injection molded parts;

[0044] Then, the cooling speed difference of all monitoring points of the historical injection molded parts is averaged to obtain the cooling speed difference of the monitoring points of the historical injection molded parts;

[0045] By formula , the heat pipe cooling medium flow speed control value Q is calculated; where HC represents the current injection molded part thickness deviation value, Lc represents the mean deviation of the thickness of the historical injection molded part monitoring point, and Hj represents the mean difference in cooling speed of the historical injection molded part monitoring point. It represents the correction factor of the flow of heat pipe cooling medium on the cooling speed of injection molded parts.

[0046] A temperature-based injection mold production control system, comprising:

[0047] Collection and calculation module: obtains the injection molded part size data and calculates the injection molded part thickness risk value, wherein the injection molded part size data includes the injection molded part thickness value;

[0048] Injection molded part thickness risk judgment module: According to the injection molded part thickness risk value, the influence of the injection molded part thickness on the injection molded part quality is judged, and an injection molded part thickness risk signal is generated; wherein the thickness evaluation signal includes an injection molded part thickness high risk signal and an injection molded part thickness low risk signal;

[0049] Monitoring point abnormal signal coincidence rate calculation module: based on the unqualified injection molded part thickness signal, the injection molded part temperature data is obtained, and the monitoring point abnormal signal coincidence rate is calculated; wherein the injection molded part data includes the injection molded part temperature value;

[0050] Injection molded part cooling speed correlation judgment module: according to the monitoring abnormal point overlap rate, the influence of the injection molded part cooling speed on the injection molded part thickness is judged, and the injection molded part cooling speed correlation signal is generated; wherein, the injection molded part cooling speed correlation signal includes the injection molded part cooling speed pre-correlation signal and the injection molded part cooling speed non-correlation signal;

[0051] Injection molded part cooling speed correlation strength judgment module: based on the injection molded part cooling speed pre-correlation signal, the injection molded part monitoring point data is obtained, the strength of the correlation between the injection molded part thickness and the cooling speed is judged, and the cooling speed correlation strength signal is generated; wherein the monitoring point data includes the monitoring point thickness deviation value and the monitoring point cooling difference speed, and the cooling speed correlation strength signal includes the cooling speed correlation large signal and the cooling speed correlation small signal;

[0052] The flow velocity control value calculation module of the heat pipe cooling medium: based on the large signal related to the cooling velocity of the injection molded part, the injection molded part thickness data and the injection molded part cooling data are obtained, and the flow velocity control value of the heat pipe cooling medium is calculated; wherein, the injection molded part thickness data includes the thickness deviation value of the injection molded part monitoring point, and the injection molded part temperature data includes the cooling difference velocity of the injection molded part monitoring point.

[0053] Beneficial effects of the present invention:

[0054] The present invention can not only judge whether the injection mold production is abnormal by the thickness value of the injection molded part, but also judge the influence of the thickness of the injection molded part on the injection mold production, so that the injection molding production environment can be adjusted according to the data and signals;

[0055] The present invention can not only determine the correlation between the thickness of the injection molded part and the cooling speed of the injection molded part, but also enable it to subsequently adjust the cooling speed of the injection molded part based on the signal and data;

[0056] The present invention calculates the influence coefficient of the cooling difference speed of the injection molded part on the thickness of the injection molded part, completes the regulation of the flow speed of the heat pipe cooling medium, optimizes the cooling speed of the injection molded part during the injection molding process, and improves the qualified rate of the injection molded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] Figure 1 is a flowchart of Embodiment 1 of the present invention;

[0059] Figure 2is a flowchart of Embodiment 2 of the present invention;

[0060] Figure 3 is a flowchart of Embodiment 3 of the present invention;

[0061] Figure 4 It is a flowchart of embodiment 4 of the present invention. DETAILED DESCRIPTION

[0062] 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. Example 1

[0063] See also Figure 1 As shown, the present invention is a temperature-based injection mold production control method, comprising the following steps:

[0064] Step 1: Obtain the injection molded part size data and calculate the injection molded part thickness risk value;

[0065] Among them, the injection molded part size data includes the injection molded part thickness value;

[0066] In some embodiments, a plurality of monitoring points are evenly set on the injection molded part, and the thickness value of the injection molded part at each monitoring point is obtained;

[0067] The thickness value of a single monitoring point is calculated by absolute difference with the thickness value of the same position of the standard injection molded part to obtain the thickness deviation value of the monitoring point;

[0068] The variance of the thickness deviation values ​​of all monitoring points is calculated to obtain the thickness deviation fluctuation value of the monitoring points;

[0069] Further, the thickness deviation value of the monitoring point is compared with the production error value;

[0070] It should be noted that the production error value refers to the difference between the actual injection molding parameters and the design parameters caused by various reasons during the production process. The difference value should be set within the range that does not affect the performance of the injection molding parts. In addition, the production error value is an absolute value.

[0071] When the thickness deviation value of the monitoring point is greater than or equal to the production error value, a thickness abnormality signal of the monitoring point is generated;

[0072] When the thickness deviation value of the monitoring point is less than the production error value, a normal thickness signal of the monitoring point is generated;

[0073] The number of abnormal thickness signals at the monitoring points is obtained, and the ratio of the obtained number of abnormal thickness signals at the monitoring points to the total number of monitoring points is calculated to obtain the abnormal number ratio of the monitoring points;

[0074] The thickness deviation fluctuation value of the monitoring point and the abnormal number ratio of the monitoring point are weighted and calculated to obtain the thickness risk value of the injection molded part;

[0075] For example, by formula , the injection molded part thickness risk value F is calculated; where B represents the thickness deviation fluctuation value of the monitoring point, M represents the abnormal number ratio of the monitoring point, a and b are both proportional coefficients, and a+b=1;

[0076] It should be noted that the values ​​of a and b are empirical values ​​and are set according to production requirements;

[0077] Step 2: According to the risk value of the injection molded part thickness, determine the impact of the injection molded part thickness on the injection molded part quality and generate an injection molded part thickness signal;

[0078] Among them, the thickness evaluation signal includes an injection molded part thickness unqualified signal and an injection molded part thickness qualified signal;

[0079] In some embodiments, obtaining a thickness risk value, and comparing the thickness risk value to a thickness risk threshold;

[0080] If the thickness risk value is greater than or equal to the thickness risk threshold, a thickness failure signal is generated; when a thickness failure signal is received, it means that the thickness deviation value of the injection molded part is too high during the injection mold production process. The higher the thickness risk value, the greater the thickness deviation value of the injection molded part during the injection mold production process, and the less the quality of the injection molded part meets the production requirements;

[0081] If the thickness risk value is less than the thickness risk threshold, a thickness qualified signal is generated; when a thickness qualified signal is received, it means that the thickness deviation value of the injection molded part is small during the injection mold production process. The lower the thickness risk value, the smaller the thickness deviation value of the injection molded part during the injection mold production process, and the more the quality of the injection molded part meets the production requirements;

[0082] The technical solution of the present invention is as follows: injection molded part data is acquired, and an injection molded part thickness risk value is calculated; based on the injection molded part thickness risk value, the influence of the injection molded part thickness on the injection molded part quality is judged, and an injection molded part thickness risk signal is generated; the present invention can not only judge whether an abnormality occurs in the injection mold production through the injection molded part thickness value, but also judge the influence of the injection molded part thickness on the injection mold production, so that it is convenient to adjust the injection molding production environment in the future according to the data and signal, reduce the thickness deviation of the injection molded part, and improve product quality. Example 2

[0083] See also Figure 2As shown, the present invention is a temperature-based injection mold production control method, which also includes the following steps:

[0084] Step 3: Based on the unqualified signal of the injection molded part thickness, the temperature data of the injection molded part is obtained, and the overlap rate of the abnormal monitoring points is calculated;

[0085] Among them, the injection molded part data includes the injection molded part temperature value;

[0086] In some embodiments, the temperature change rate of the injection molded part at each monitoring point during the injection molded part production cycle is obtained and marked as the cooling rate of the monitoring point;

[0087] It should be noted that the production cycle of injection molding refers to the time from when the molten raw material enters the mold to when the raw material is cooled and the injection molding is opened.

[0088] The difference between the cooling speed of the monitoring point and the cooling speed of the standard injection molded part is calculated to obtain the cooling difference speed of the monitoring point;

[0089] It should be noted that the standard injection molded part cooling speed indicates the temperature change speed of the injection molded standard part. The standard part is the standard of the current injection molded part type. The standard injection molded part cooling speeds corresponding to different types of injection molded parts are also different. The classification of the standard injection molded parts in this embodiment should be consistent with the classification of the current injection molded parts.

[0090] comparing the cooling difference speed of the monitoring point with the cooling difference speed threshold of the monitoring point;

[0091] If the cooling difference speed of the monitoring point is greater than or equal to the cooling difference speed threshold of the monitoring point, a cooling abnormality signal of the monitoring point is generated;

[0092] If the cooling difference speed of the monitoring point is less than the cooling difference speed threshold of the monitoring point, a normal cooling signal of the monitoring point is generated;

[0093] It should be noted that the cooling speed difference threshold of the monitoring point is an empirical value, which is set by relevant personnel in this field;

[0094] Furthermore, a two-dimensional coordinate system model is established with the width of the injection molded part as the X-axis and the height as the Y-axis, and several monitoring points of the injection molded part are substituted into the coordinate system;

[0095] Substituting the monitoring point generating the cooling abnormality signal into the two-dimensional coordinate system model to form a distribution diagram of the cooling abnormality signal at the monitoring point;

[0096] Substitute the monitoring point that generates the abnormal thickness signal into the two-dimensional coordinate system model to form a distribution diagram of the abnormal thickness signal of the monitoring point;

[0097] Traverse the coordinates of the two-dimensional coordinate system to obtain the repeated coordinates of the abnormal signal;

[0098] Obtain the number of repeated coordinates of abnormal signals, calculate the ratio of the number of repeated coordinates of abnormal signals to the total number of coordinates, obtain the coordinate coincidence rate, and mark it as the abnormal signal coincidence rate of the monitoring point;

[0099] Among them, the traversal method is:

[0100] The number of abnormal signals at each coordinate is used for judgment. If the number of abnormal signals at the coordinate is two, the coordinate is marked as a coordinate with repeated abnormal signals.

[0101] Step 4: According to the overlap rate of abnormal signals at the monitoring points, determine the influence of the cooling speed of the injection molded part on the thickness of the injection molded part, and generate a correlation signal of the cooling speed of the injection molded part;

[0102] The injection molded part cooling speed correlation signal includes an injection molded part cooling speed pre-correlation signal and an injection molded part cooling speed non-correlation signal;

[0103] In some embodiments, the monitoring point abnormal signal coincidence rate is obtained, and the monitoring point abnormal signal coincidence rate is compared with a monitoring point abnormal signal coincidence rate threshold;

[0104] If the overlap rate of abnormal signals at the monitoring points is greater than or equal to the threshold of the overlap rate of abnormal signals at the monitoring points, a pre-correlation signal of the cooling speed of the injection molded part is generated; when the pre-correlation signal of the cooling speed of the injection molded part is received, it indicates that the abnormal thickness of the injection molded part may be related to the cooling speed;

[0105] If the overlap rate of abnormal signals at the monitoring points is less than the overlap rate threshold of abnormal signals at the monitoring points, a signal indicating that the cooling speed of the injection molded part has no correlation is generated; when a signal indicating that the cooling speed of the injection molded part has no correlation is received, it indicates that the abnormal thickness of the injection molded part has nothing to do with the cooling speed, and further analysis is required on the cause of the abnormal thickness value of the injection molded part;

[0106] Step 5: Based on the pre-correlation signal of the injection molded part cooling speed, the injection molded part monitoring point data is obtained, the strength of the correlation between the injection molded part thickness and the cooling speed is determined, and a cooling speed correlation strength signal is generated;

[0107] The monitoring point data include the thickness deviation value of the monitoring point and the cooling difference speed of the monitoring point, and the cooling speed correlation strength signal includes the cooling speed correlation large signal and the cooling speed correlation small signal;

[0108] In some embodiments, the thickness deviation value and the cooling differential speed of the monitoring point are obtained, and the thickness deviation value and the cooling differential speed of the monitoring point of the injection molded part are ratio-calculated to obtain the ratio of the thickness deviation value to the cooling differential speed, which is marked as the thickness-cooling ratio;

[0109] Calculate the variance of the thickness-to-cooling ratio of all monitoring points to obtain the thickness-to-cooling ratio fluctuation value;

[0110] Setting a thickness ratio fluctuation threshold, and comparing the thickness ratio fluctuation value with the thickness ratio fluctuation threshold;

[0111] If the thickness ratio fluctuation value is greater than or equal to the thickness ratio fluctuation threshold, it means that the greater the thickness ratio fluctuation, the smaller the correlation between the injection molded part thickness abnormality and the cooling speed, and a small signal of the injection molded part cooling speed correlation is generated;

[0112] If the thickness ratio fluctuation value is less than the thickness ratio fluctuation threshold, it means that the smaller the thickness ratio fluctuation is, the greater the correlation between the injection molded part thickness abnormality and the cooling speed is, and a large signal of the injection molded part cooling speed correlation is generated;

[0113] The technical solution of the present invention is as follows: based on the high-risk signal of the injection molded part thickness, the injection molded part temperature data is obtained, and the overlap rate of the abnormal monitoring points is calculated; according to the overlap rate of the abnormal signal of the monitoring point, the influence of the injection molded part cooling speed on the injection molded part thickness is judged, and the injection molded part cooling speed correlation signal is generated; the present invention can not only judge the correlation between the injection molded part thickness and the injection molded part cooling speed, but also make it possible to subsequently adjust the injection molded part cooling speed based on the signal and data. Example 3

[0114] See also Figure 3 As shown, the present invention is a temperature-based injection mold production control method, which also includes the following steps:

[0115] Step 6: Based on the large signal related to the cooling speed of the injection molded part, the thickness data and the cooling data of the injection molded part are obtained, and the flow speed control value of the heat pipe cooling medium is calculated;

[0116] Among them, the injection molded part thickness data includes the injection molded part monitoring point thickness deviation value, and the injection molded part temperature data includes the injection molded part monitoring point cooling difference speed;

[0117] In some embodiments, a thickness deviation value and a cooling differential speed at a monitoring point where an abnormal signal of the injection molded part overlaps are obtained;

[0118] It should be noted that the overlapped part of the abnormal monitoring points of the injection molded parts indicates that the thickness deviation value and cooling difference speed of the monitoring point are abnormal;

[0119] The thickness deviation values ​​of all monitoring points of historical injection molded parts are averaged to obtain the thickness deviation mean of the monitoring points of historical injection molded parts;

[0120] Then, the cooling speed difference of all monitoring points of the historical injection molded parts is averaged to obtain the cooling speed difference of the monitoring points of the historical injection molded parts;

[0121] By formula , the heat pipe cooling medium flow speed control value Q is calculated; where HC represents the current injection molded part thickness deviation value, Lc represents the mean deviation of the thickness of the historical injection molded part monitoring point, and Hj represents the mean difference in cooling speed of the historical injection molded part monitoring point. It represents the correction factor of the flow of heat pipe cooling medium on the cooling speed of injection molded parts;

[0122] When the heat pipe cooling medium flow rate control value Q is received, a control instruction is sent to the control end of the heat pipe cooling medium flow rate, so that the heat pipe cooling medium is adjusted to a flow rate corresponding to the required injection molded part cooling speed, thereby optimizing the cooling speed of the injection molded part during the injection molding process and improving the qualified rate of the injection molded parts;

[0123] It should be noted that the heat pipe cooling medium is one of the heat dissipation methods during the injection molding process of the injection molded parts. The faster the flow rate of the heat pipe cooling medium, the stronger the heat dissipation capacity. Conversely, the slower the flow rate of the heat pipe cooling medium, the lower the heat dissipation capacity.

[0124] The technical solution of the present invention is as follows: Based on a large signal associated with the cooling speed of an injection molded part, the present invention obtains the thickness data and the cooling data of the injection molded part, and calculates the flow control value of the heat pipe cooling medium; the present invention calculates the influence coefficient of the cooling difference speed of the injection molded part on the thickness of the injection molded part, completes the control of the flow speed of the heat pipe cooling medium, optimizes the cooling speed of the injection molded part during the injection molding process, and improves the qualified rate of the injection molded parts. Example 4

[0125] See also Figure 4 As shown, the present invention is a temperature-based injection mold production control system, comprising:

[0126] Collection and calculation module: obtains the injection molded part size data and calculates the injection molded part thickness risk value, wherein the injection molded part size data includes the injection molded part thickness value;

[0127] Injection molded part thickness risk judgment module: According to the injection molded part thickness risk value, the influence of the injection molded part thickness on the injection molded part quality is judged, and an injection molded part thickness risk signal is generated; wherein the thickness evaluation signal includes an injection molded part thickness high risk signal and an injection molded part thickness low risk signal;

[0128] Monitoring point abnormal signal coincidence rate calculation module: based on the unqualified injection molded part thickness signal, the injection molded part temperature data is obtained, and the monitoring point abnormal signal coincidence rate is calculated; wherein the injection molded part data includes the injection molded part temperature value;

[0129] Injection molded part cooling speed correlation judgment module: according to the monitoring abnormal point overlap rate, the influence of the injection molded part cooling speed on the injection molded part thickness is judged, and the injection molded part cooling speed correlation signal is generated; wherein, the injection molded part cooling speed correlation signal includes the injection molded part cooling speed pre-correlation signal and the injection molded part cooling speed non-correlation signal;

[0130] Injection molded part cooling speed correlation strength judgment module: based on the injection molded part cooling speed pre-correlation signal, the injection molded part monitoring point data is obtained, the strength of the correlation between the injection molded part thickness and the cooling speed is judged, and the cooling speed correlation strength signal is generated; wherein the monitoring point data includes the monitoring point thickness deviation value and the monitoring point cooling difference speed, and the cooling speed correlation strength signal includes the cooling speed correlation large signal and the cooling speed correlation small signal;

[0131] The flow velocity control value calculation module of the heat pipe cooling medium is based on the large signal of the injection molding part cooling velocity correlation, and the injection molding part thickness data and the injection molding part cooling data are obtained to calculate the flow velocity control value of the heat pipe cooling medium; wherein the injection molding part thickness data includes the injection molding part monitoring point thickness deviation value, and the injection molding part temperature data includes the injection molding part monitoring point cooling difference velocity;

[0132] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A temperature-based injection mold production control method, characterized in that: The following steps are involved: Step 1: Obtain the injection molded part dimension data and calculate the injection molded part thickness risk value; wherein the injection molded part dimension data includes the injection molded part thickness value; Step 2: According to the risk value of the thickness of the injection molded part, determine the influence of the thickness of the injection molded part on the quality of the injection molded part, and generate an injection molded part thickness signal; wherein the thickness evaluation signal includes an injection molded part thickness unqualified signal and an injection molded part thickness qualified signal; Step 3: Based on the unqualified signal of the injection molded part thickness, the injection molded part temperature data is obtained, and the coincidence rate of the abnormal monitoring points is calculated; wherein the injection molded part data includes the injection molded part temperature value; Step 4: according to the overlap rate of abnormal signals at the monitoring points, determine the influence of the cooling speed of the injection molded part on the thickness of the injection molded part, and generate a cooling speed correlation signal of the injection molded part; wherein the cooling speed correlation signal of the injection molded part includes a cooling speed pre-correlation signal of the injection molded part and a cooling speed non-correlation signal of the injection molded part; Step 5: Based on the pre-correlation signal of the injection molded part cooling speed, the injection molded part monitoring point data is obtained, the strength of the correlation between the injection molded part thickness and the cooling speed is determined, and a cooling speed correlation strength signal is generated; wherein the monitoring point data includes the monitoring point thickness deviation value and the monitoring point cooling difference speed, and the cooling speed correlation strength signal includes a cooling speed correlation large signal and a cooling speed correlation small signal; Step six: Based on the large signal associated with the cooling speed of the injection molded part, the injection molded part thickness data and the injection molded part cooling data are obtained, and the flow speed control value of the heat pipe cooling medium is calculated; wherein, the injection molded part thickness data includes the thickness deviation value of the injection molded part monitoring point, and the injection molded part temperature data includes the cooling speed difference of the injection molded part monitoring point.

2. A temperature-based injection mold production control method according to claim 1, characterized in that: In step 1, a plurality of monitoring points are evenly set on the injection molded part, and the thickness value of the injection molded part at each monitoring point is obtained; The thickness value of a single monitoring point is calculated by absolute difference with the thickness value of the same position of the standard injection molded part to obtain the thickness deviation value of the monitoring point; The variance of the thickness deviation values ​​of all monitoring points is calculated to obtain the thickness deviation fluctuation value of the monitoring points; Compare the thickness deviation value of the monitoring point with the production error value; When the thickness deviation value of the monitoring point is greater than or equal to the production error value, a thickness abnormality signal of the monitoring point is generated.

3. A temperature-based injection mold production control method according to claim 2, characterized in that: In step 1, the number of abnormal thickness signals at the monitoring points is obtained, and the ratio of the obtained number of abnormal thickness signals at the monitoring points to the total number of monitoring points is calculated to obtain the abnormal number ratio of the monitoring points; By formula , the injection molded part thickness risk value F is calculated; where B represents the thickness deviation fluctuation value of the monitoring point, M represents the abnormal number ratio of the monitoring point, and a and b are both proportional coefficients.

4. A temperature-based injection mold production control method according to claim 3, characterized in that: In step 2, a thickness risk value is obtained, and the thickness risk value is compared with a thickness risk threshold; If the thickness risk value is greater than or equal to the thickness risk threshold, a thickness failure signal is generated.

5. The temperature-based injection mold production control method according to claim 1, characterized in that: In step 3, the temperature change rate of the injection molded part at each monitoring point during the injection molded part production cycle is obtained and marked as the cooling rate of the monitoring point; The difference between the cooling speed of the monitoring point and the cooling speed of the standard injection molded part is calculated to obtain the cooling difference speed of the monitoring point; comparing the cooling difference speed of the monitoring point with the cooling difference speed threshold of the monitoring point; If the cooling difference speed of the monitoring point is greater than or equal to the cooling difference speed threshold of the monitoring point, a cooling abnormality signal of the monitoring point is generated; If the monitoring point cooling difference speed is less than the monitoring point cooling difference speed threshold, a monitoring point cooling normal signal is generated.

6. The temperature-based injection mold production control method according to claim 1, characterized in that: In step three, a two-dimensional coordinate model is established with the width of the injection molded part as the X-axis and the height as the Y-axis, and several monitoring points of the injection molded part are substituted into the coordinate system; Substituting the monitoring point generating the abnormal cooling signal into the two-dimensional coordinate system model to form a distribution diagram of the abnormal cooling signal at the monitoring point; Substitute the monitoring point that generates the abnormal thickness signal into the two-dimensional coordinate system model to form a distribution diagram of the abnormal thickness signal of the monitoring point; Traverse the coordinates of the two-dimensional coordinate system to obtain the repeated coordinates of the abnormal signal; Obtain the number of repeated coordinates, calculate the ratio of the number of repeated coordinates to the total number of coordinates, obtain the coordinate coincidence rate, and mark it as the abnormal signal coincidence rate of the monitoring point; The traversal method is: A judgment is made based on the number of abnormal signals at each coordinate. If the number of abnormal signals at the coordinate is two, the coordinate is marked as a coordinate with repeated abnormal signals.

7. A temperature-based injection mold production control method according to claim 6, characterized in that: In step 4, the abnormal signal overlap rate of the monitoring point is obtained, and the abnormal signal overlap rate of the monitoring point is compared with the abnormal signal overlap rate threshold of the monitoring point; If the monitoring point abnormal signal overlap rate is greater than or equal to the monitoring point abnormal signal overlap rate threshold, a cooling speed pre-correlation signal of the injection molded part is generated; If the overlap rate of abnormal signals at the monitoring points is less than the threshold of the overlap rate of abnormal signals at the monitoring points, a signal having no correlation with the cooling speed of the injection molded part is generated.

8. The temperature-based injection mold production control method according to claim 7, characterized in that: In step 5, the thickness deviation value and the cooling differential speed of the monitoring point are obtained, and the thickness deviation value and the cooling differential speed of the monitoring point of the injection molded part are ratio-calculated to obtain the ratio of the thickness deviation value to the cooling differential speed, which is marked as the thickness-cooling ratio; Calculate the variance of the thickness-to-cooling ratio of all monitoring points to obtain the thickness-to-cooling ratio fluctuation value; Setting a thickness ratio fluctuation threshold, and comparing the thickness ratio fluctuation value with the thickness ratio fluctuation threshold; If the thickness ratio fluctuation value is less than the thickness ratio fluctuation threshold, a large signal related to the cooling speed of the injection molded part is generated.

9. The temperature-based injection mold production control method according to claim 1, characterized in that: In step six, the thickness deviation value and cooling difference speed of the monitoring point where the abnormal signal of the injection molded part overlaps are obtained; The thickness deviation values ​​of all monitoring points of historical injection molded parts are averaged to obtain the thickness deviation mean of the monitoring points of historical injection molded parts; Then, the cooling speed difference of all monitoring points of the historical injection molded parts is averaged to obtain the cooling speed difference of the monitoring points of the historical injection molded parts; By formula , the heat pipe cooling medium flow speed control value Q is calculated; where HC represents the current injection molded part thickness deviation value, Lc represents the mean deviation of the thickness of the historical injection molded part monitoring point, and Hj represents the mean difference in cooling speed of the historical injection molded part monitoring point. It represents the correction factor of the flow of heat pipe cooling medium on the cooling speed of injection molded parts.

10. A temperature-based injection mold production control system, characterized in that: The control system is used to execute the method described in any one of claims 1 to 9, and the control system comprises: Collection and calculation module: obtains the injection molded part size data and calculates the injection molded part thickness risk value, wherein the injection molded part size data includes the injection molded part thickness value; Injection molded part thickness risk judgment module: According to the injection molded part thickness risk value, the influence of the injection molded part thickness on the injection molded part quality is judged, and an injection molded part thickness risk signal is generated; wherein the thickness evaluation signal includes an injection molded part thickness high risk signal and an injection molded part thickness low risk signal; Monitoring point abnormal signal coincidence rate calculation module: based on the unqualified injection molded part thickness signal, the injection molded part temperature data is obtained, and the monitoring point abnormal signal coincidence rate is calculated; wherein the injection molded part data includes the injection molded part temperature value; Injection molded part cooling speed correlation judgment module: according to the monitoring abnormal point overlap rate, the influence of the injection molded part cooling speed on the injection molded part thickness is judged, and the injection molded part cooling speed correlation signal is generated; wherein, the injection molded part cooling speed correlation signal includes the injection molded part cooling speed pre-correlation signal and the injection molded part cooling speed non-correlation signal; Injection molded part cooling speed correlation strength judgment module: based on the injection molded part cooling speed pre-correlation signal, the injection molded part monitoring point data is obtained, the strength of the correlation between the injection molded part thickness and the cooling speed is judged, and the cooling speed correlation strength signal is generated; wherein the monitoring point data includes the monitoring point thickness deviation value and the monitoring point cooling difference speed, and the cooling speed correlation strength signal includes the cooling speed correlation large signal and the cooling speed correlation small signal; The flow velocity control value calculation module of the heat pipe cooling medium: based on the large signal related to the cooling velocity of the injection molded part, the injection molded part thickness data and the injection molded part cooling data are obtained, and the flow velocity control value of the heat pipe cooling medium is calculated; wherein, the injection molded part thickness data includes the thickness deviation value of the injection molded part monitoring point, and the injection molded part temperature data includes the cooling difference velocity of the injection molded part monitoring point.

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