Determination method and system for deformation and warping parameters of injection molding plate

Abstract

The invention discloses a method and a system for determining deformation and warping parameters of an injection molding plate. The method comprises the following steps: acquiring simulation deformation data reflecting the deformation and warping degree of the injection molding plate; judging whether the change trend of the simulation deformation data relative to the standard deformation data is the same and meets a measurement index or not; if the change trends are the same and meet the measurement index, storing the first deformation warping parameter; if the change trends are the same but do not meet the measurement index, modifying a first deformation warping parameter corresponding to the simulation deformation data; if the change trends are different, the simulation deformation data are obtained again after the simulation mode for obtaining the simulation deformation data is switched, and the simulation deformation data are compared with the standard deformation data again. According to the method provided by the invention, the deformation warping of the injection molding plate can be simulated based on the preset deformation warping parameters, the obtained simulation deformation data reflecting the deformation warping degree of the injection molding plate is compared with the standard deformation data, and the corresponding deformation warping parameters are stored when the change trend and the measurement index are met.

Description

Technical Field

[0001] This invention relates to the field of injection molding, and further to a method and system for determining the deformation and warpage parameters of injection molded sheets. Background Technology

[0002] Warpage refers to a significant change in the shape of a product after molding, which no longer meets the shape accuracy requirements of the design. It is a common quality problem in injection molded products.

[0003] In recent years, with the rapid development of the plastics industry, especially the ever-changing electronic information products, the requirements for the appearance and performance of plastic products have become increasingly stringent. For example, in the field of electronic products such as laptops and mobile phones, the degree of warping and deformation of components has become one of the key indicators for measuring product quality.

[0004] Cover-type warping typically refers to unintended bending or warping deformation in thin, plate-like or shell-like components (such as cover plates, shells, and panels) caused by uneven internal stress (such as temperature gradients, shrinkage differences, and fiber orientation differences). Numerical methods for calculating this type of warping require consideration of material constitutive properties, boundary conditions, and loading history (such as temperature field and curing shrinkage). The core principle is to solve the stress-strain relationship through numerical simulation to ultimately predict the warping displacement. Currently, there is no effective method for calculating the numerical value of cover-type warping. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a method and system for determining the deformation and warpage parameters of injection-molded sheet materials. This method can simulate the deformation and warpage of injection-molded sheet materials based on preset deformation and warpage parameters, compare the obtained simulated deformation data reflecting the degree of deformation and warpage of the injection-molded sheet materials with standard deformation data, and save the corresponding deformation and warpage parameters when the changing trend and measurement indicators are met, so as to produce injection-molded sheet materials with deformation and warpage within a suitable range according to the deformation and warpage parameters.

[0006] To achieve the above objectives, the present invention aims to provide a method for determining the deformation and warpage parameters of injection-molded sheet metal, comprising:

[0007] Obtain simulation deformation data that reflects the degree of deformation and warping of injection-molded sheet metal;

[0008] The simulated deformation data is compared with the standard deformation data corresponding to the standard injection molded sheet, and it is determined whether the trend of the simulated deformation data is the same as that of the standard deformation data and whether it meets the evaluation criteria.

[0009] In response to the same trend of change and the satisfaction of the measurement index, the first deformation warping parameter corresponding to the simulation deformation data is saved;

[0010] In response to the same trend of change but not meeting the measurement index, the first deformation warping parameter corresponding to the simulated deformation data is modified to the second deformation warping parameter, and the simulated deformation data corresponding to the second deformation warping parameter is obtained again. When the simulated deformation data meets the measurement index when compared with the standard deformation data, the second deformation warping parameter is saved.

[0011] In response to the different trends of change, the simulation mode when acquiring the simulation deformation data is switched and the simulation deformation data is acquired again, and the simulation deformation data is compared with the standard deformation data again.

[0012] In some implementations, comparing the simulated deformation data with the standard deformation data corresponding to the standard injection-molded sheet, and determining whether the changing trends of the simulated deformation data and the standard deformation data are the same and whether they meet the measurement indicators, includes the following steps:

[0013] The data of multiple corresponding points in the simulated deformation data and the standard deformation data are compared to obtain the correlation coefficient and the overall accuracy.

[0014] The correlation coefficient is compared with a preset coefficient to determine whether the variation trend of the simulated deformation data and the standard deformation data is the same;

[0015] The overall accuracy rate is compared with the preset accuracy rate to determine whether the simulated deformation data meets the evaluation criteria.

[0016] In some implementations, the preset coefficient is 0.8, and the preset accuracy is 70%.

[0017] In some embodiments, the first deformation warpage parameter includes , , , .

[0018] In some implementations, when the simulated deformation data reflecting the degree of deformation and warping of the injection-molded sheet is first acquired, the simulated deformation mode is: the warping analysis form is "small deformation", the material UDB data is raw material data, and the mesh form is "3D mesh".

[0019] When the first response to the different trends of change occurs, the warping analysis form is switched from "small deformation" to "large deformation".

[0020] When the second response is different from the stated trend, the material UDB data is switched to a preset material, which has the same glass fiber content as the raw material and has Stamp shrinkage data;

[0021] When the third response differs from the stated trend, the grid is switched to a dual domain or mid planel grid.

[0022] According to another aspect of this application, a system for determining the deformation and warpage parameters of injection-molded sheet metal is further provided, comprising:

[0023] The data acquisition module is used to acquire simulation deformation data that reflects the degree of deformation and warping of the injection-molded sheet.

[0024] The data comparison module is used to compare the simulated deformation data with the standard deformation data corresponding to the standard injection molded sheet, and to determine whether the change trend of the simulated deformation data is the same as that of the standard deformation data and whether it meets the measurement index.

[0025] The parameter saving module is used to modify the first deformation warpage parameter corresponding to the simulated deformation data to a second deformation warpage parameter in response to the same trend of change but not meeting the measurement index, and to obtain the simulated deformation data corresponding to the second deformation warpage parameter again. When the simulated deformation data meets the measurement index when compared with the standard deformation data, the second deformation warpage parameter is saved. In response to different trends of change, the simulation mode when obtaining the simulated deformation data is switched and the simulated deformation data is obtained again, and the simulated deformation data is compared with the standard deformation data again.

[0026] In some implementations, the data comparison module includes a correlation comparison unit and an accuracy comparison unit. The data comparison module is used to compare the data of multiple corresponding points in the simulated deformation data and the standard deformation data to obtain the correlation coefficient and the overall accuracy.

[0027] The correlation comparison unit is used to compare the correlation coefficient with a preset coefficient to determine whether the variation trend of the simulated deformation data and the standard deformation data is the same.

[0028] The accuracy comparison unit is used to compare the overall accuracy with a preset accuracy to determine whether the simulated deformation data meets the measurement index.

[0029] In some implementations, the preset coefficient is 0.8, and the preset accuracy is 70%.

[0030] In some embodiments, the first deformation warpage parameter includes , , , .

[0031] In some embodiments, the system for determining the deformation and warpage parameters of the injection-molded sheet further includes a mode switching module, the mode switching module being used for:

[0032] When the simulation deformation data reflecting the degree of deformation and warping of the injection-molded sheet is first obtained, the simulation deformation mode is: warping analysis form is "small deformation", material UDB data is raw material data, and mesh form is "3D mesh";

[0033] When the first response to the different trends of change occurs, the warping analysis form is switched from "small deformation" to "large deformation".

[0034] When the second response is different from the stated trend, the material UDB data is switched to a preset material, which has the same glass fiber content as the raw material and has Stamp shrinkage data;

[0035] When the third response differs from the stated trend, the grid is switched to a dual domain or mid planel grid. Attached Figure Description

[0036] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0037] Figure 1 This is a flowchart illustrating a preferred embodiment of the method for determining the deformation and warpage parameters of injection-molded sheet metal.

[0038] Figure 2 This is a flowchart illustrating the comparison between simulated deformation data and standard deformation data in the method for determining deformation and warpage parameters of injection-molded sheet metal according to a preferred embodiment of the present invention.

[0039] Figure 3 This is a flowchart illustrating the process of switching simulation deformation modes in the method for determining deformation and warpage parameters of injection-molded sheet metal according to a preferred embodiment of the present invention.

[0040] Figure 4 This is a block diagram of a system for determining the deformation and warpage parameters of injection-molded sheet metal according to a preferred embodiment of the present invention. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0042] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0043] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] refer to Figures 1 to 3 This application provides a method 100 for determining the deformation and warpage parameters of injection molded sheet metal, the method 100 comprising:

[0047] S101: Obtain simulation deformation data reflecting the degree of deformation and warping of the injection-molded sheet;

[0048] S102: Compare the simulated deformation data with the standard deformation data corresponding to the standard injection molded sheet, and determine whether the trend of change of the simulated deformation data relative to the standard deformation data is the same and whether it meets the measurement index.

[0049] S103: In response to the same change trend and the satisfaction of the measurement index, save the first deformation warping parameter corresponding to the simulation deformation data;

[0050] S104: In response to the same trend of change but not meeting the measurement index, modify the first deformation warping parameter corresponding to the simulated deformation data to the second deformation warping parameter, obtain the simulated deformation data corresponding to the second deformation warping parameter again, and save the second deformation warping parameter when the simulated deformation data meets the measurement index compared with the standard deformation data.

[0051] S105: In response to the different trends of change, after switching the simulation mode when acquiring the simulation deformation data, the simulation deformation data is acquired again, and the simulation deformation data is compared with the standard deformation data again.

[0052] The method 100 for determining the deformation and warpage parameters of injection molded sheet provided in this application can simulate the deformation and warpage of injection molded sheet based on preset deformation and warpage parameters, and compare the obtained simulation deformation data reflecting the degree of deformation and warpage of injection molded sheet with standard deformation data. When the change trend and measurement index are met, the corresponding deformation and warpage parameters are saved so that the injection molded sheet with deformation and warpage within a suitable range can be produced according to the deformation and warpage parameters.

[0053] Specifically, in step S101 above, simulated deformation data of the injection-molded sheet is first obtained. This simulated deformation data reflects the degree of deformation and warping of the injection-molded sheet. Preferably, the simulated deformation data includes surface warping data at multiple points on the injection-molded sheet.

[0054] In step S102 above, before comparing the data, it is necessary to first set standard deformation data corresponding to the standard injection molded sheet. In some embodiments, the standard deformation data can be obtained by measuring the standard sheet. In some embodiments, the standard deformation data can also be obtained through simulation. After obtaining the simulated deformation data, the simulated deformation data is compared with the standard deformation data to determine whether the change trend of the simulated deformation data relative to the standard deformation data is the same and whether it meets the measurement index.

[0055] In step S103 above, the change trend of the simulated deformation data is first compared with that of the standard deformation data. If the change trends of the two are the same, it is then determined whether the difference between the two meets the measurement index. When the change trends of the two are the same and the measurement index is met, the first deformation warping parameter corresponding to the simulated deformation data is saved.

[0056] In step S104 above, in response to the fact that the simulated deformation data and the standard deformation data have the same trend of change, but the difference between the two does not meet the measurement index, the first deformation warpage parameter corresponding to the simulated deformation data is modified to a second deformation warpage parameter, and the simulated deformation data corresponding to the second deformation warpage parameter is obtained again. When the simulated deformation data and the standard deformation data meet the measurement index, the second deformation warpage parameter is saved. That is, when the difference between the simulated deformation data and the standard deformation data does not meet the measurement index, the deformation warpage parameter is changed, and the simulated deformation data is obtained again. It is then determined again whether the simulated deformation data and the standard deformation data meet the measurement index. If not, the deformation warpage parameter is changed again, and the simulated deformation data is obtained again for comparison, until the difference between the simulated deformation data and the standard deformation data meets the measurement index, and then the corresponding deformation warpage parameter is saved.

[0057] In step S105 above, when the trend of the simulated deformation data is different from that of the standard deformation data, the simulation mode when acquiring the simulated deformation data is switched and the simulated deformation data is acquired again, and the simulated deformation data is compared with the standard data again, that is, steps S102 to S104 above are executed again.

[0058] refer to Figure 2 Step S102 above, which compares the simulated deformation data with the standard deformation data corresponding to the standard injection molded sheet, and determines whether the changing trends of the simulated deformation data and the standard deformation data are the same and whether they meet the measurement index steps, includes:

[0059] S1021: Compare the data of multiple corresponding points in the simulated deformation data and the standard deformation data to obtain the correlation coefficient and overall accuracy.

[0060] S1022: Compare the correlation coefficient with the preset coefficient to determine whether the variation trend of the simulated deformation data and the standard deformation data is the same;

[0061] S1023: Compare the overall accuracy with the preset accuracy to determine whether the simulated deformation data meets the evaluation criteria.

[0062] In step S1021 above, the data from multiple points in the simulated deformation data and the standard deformation data are compared to obtain the correlation coefficient and overall accuracy. (Correlation coefficient) ,in For simulation deformation data, For standard deformation data, The mean of the simulated deformation data, This is the mean of the standard deformation data.

[0063] In some implementations, the overall accuracy is determined based on the mean absolute error (MAE), reflecting the magnitude of the overall deviation. ,in For simulation deformation data, For standard deformation data, This represents the total points.

[0064] In some implementations, the overall accuracy is determined based on the mean relative error (MRE), reflecting the proportion of deviation, specifically as follows: .

[0065] In step S1022 above, the preset coefficient is 0.8. When the correlation coefficient calculated in step S1021 is greater than 0.8, the changing trends of the simulated deformation data and the standard deformation data are defined as the same; when the correlation coefficient is less than 0.8, the changing trends of the simulated deformation data and the standard deformation data are defined as different.

[0066] In step S1023 above, the preset accuracy rate is 70%. When the overall accuracy rate calculated in step S1021 is greater than 70%, the simulated deformation data is defined as meeting the evaluation criteria; when the overall accuracy rate is less than 70%, the simulated deformation data is defined as not meeting the evaluation criteria.

[0067] The first deformation warping parameters include , , , When the simulated deformation data does not meet the evaluation criteria, the parameters are simultaneously changed. , , , Four parameters. Among them... For elastic modulus, The coefficient of thermal expansion is Poisson's ratio, This is the shear modulus.

[0068] refer to Figure 3 Furthermore, when initially acquiring the simulation deformation data reflecting the degree of deformation and warpage of the injection-molded sheet, the simulation deformation mode is as follows: warpage analysis form is "small deformation", material UDB data is raw material data, and mesh form is "3D mesh"; in response to different trends, the simulation mode when acquiring the simulation deformation data is switched as follows:

[0069] S1051: When the change trend changes for the first time, the warping analysis form is switched from "small deformation" to "large deformation";

[0070] S1052: In the second response to a different trend, the material UDB data is switched to a preset material, which has the same glass fiber content as the raw material and has Stamp shrinkage data;

[0071] S1053: When the third response is different from the stated trend, switch the grid to a dual domain or midplane grid.

[0072] In some modified embodiments, the order of the above steps S1051, S1052 and S1053 can be interchanged, and the specific order should not constitute a limitation on this application.

[0073] refer to Figure 4 According to another aspect of this application, a system 200 for determining the deformation and warpage parameters of injection-molded sheet metal is further provided, comprising: a data acquisition module 10, a data comparison module 20, and a parameter storage module 30. The data acquisition module 10 is used to acquire simulated deformation data reflecting the degree of deformation and warpage of the injection-molded sheet metal; the data comparison module 20 is used to compare the simulated deformation data with standard deformation data corresponding to a standard injection-molded sheet metal, and determine whether the changing trend of the simulated deformation data relative to the standard deformation data is the same and whether it meets the measurement index; the parameter storage module 30 is used to, in response to the same changing trend but not meeting the measurement index, modify the first deformation and warpage parameter corresponding to the simulated deformation data to a second deformation and warpage parameter, obtain the simulated deformation data corresponding to the second deformation and warpage parameter again, and save the second deformation and warpage parameter when the simulated deformation data meets the measurement index compared with the standard deformation data; in response to different changing trends, switch the simulation mode when acquiring the simulated deformation data and acquire the simulated deformation data again, and compare the simulated deformation data with the standard deformation data again.

[0074] The data comparison module 20 includes a correlation comparison unit 21 and an accuracy comparison unit 22. The data comparison module 20 is used to compare the data of multiple corresponding points in the simulated deformation data and the standard deformation data to obtain the correlation coefficient and the overall accuracy. The correlation comparison unit 21 is used to compare the correlation coefficient with a preset coefficient to determine whether the changing trends of the simulated deformation data and the standard deformation data are the same. The accuracy comparison unit 22 is used to compare the overall accuracy with a preset accuracy to determine whether the simulated deformation data meets the measurement index.

[0075] The system for determining the deformation and warpage parameters of the injection-molded sheet further includes a mode switching module 40. The mode switching module 40 is used to: when first acquiring the simulated deformation data reflecting the degree of deformation and warpage of the injection-molded sheet, the simulated deformation mode is: warpage analysis form is "small deformation", material UDB data is raw material data, and mesh form is "3D mesh"; in response to a different trend of change for the first time, switch the warpage analysis form from "small deformation" to "large deformation"; in response to a different trend of change for the second time, switch the material UDB data to a preset material, the preset material having the same glass fiber content as the raw material and possessing Stamp shrinkage data; in response to a different trend of change for the third time, switch the mesh to a dual domain or mid-planel mesh.

[0076] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments; any variations or modifications can be made to the implementation of the present invention without departing from these principles.

Claims

1. A method for determining the deformation and warpage parameters of injection-molded sheet metal, characterized in that, include: Obtain simulation deformation data that reflects the degree of deformation and warping of injection-molded sheet metal; The simulated deformation data is compared with the standard deformation data corresponding to the standard injection molded sheet, and it is determined whether the trend of the simulated deformation data is the same as that of the standard deformation data and whether it meets the evaluation criteria. In response to the same trend of change and the satisfaction of the measurement index, the first deformation warping parameter corresponding to the simulation deformation data is saved; In response to the same trend of change but not meeting the measurement index, the first deformation warping parameter corresponding to the simulated deformation data is modified to the second deformation warping parameter, and the simulated deformation data corresponding to the second deformation warping parameter is obtained again. When the simulated deformation data meets the measurement index when compared with the standard deformation data, the second deformation warping parameter is saved. In response to the different trends of change, the simulation mode when acquiring the simulation deformation data is switched and the simulation deformation data is acquired again, and the simulation deformation data is compared with the standard deformation data again.

2. The method for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 1, characterized in that, The steps of comparing the simulated deformation data with the standard deformation data corresponding to the standard injection molded sheet, and determining whether the changing trends of the simulated deformation data and the standard deformation data are the same and whether they meet the measurement indicators, include: The data of multiple corresponding points in the simulated deformation data and the standard deformation data are compared to obtain the correlation coefficient and the overall accuracy. The correlation coefficient is compared with a preset coefficient to determine whether the variation trend of the simulated deformation data and the standard deformation data is the same; The overall accuracy rate is compared with the preset accuracy rate to determine whether the simulated deformation data meets the evaluation criteria.

3. The method for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 2, characterized in that, The preset coefficient is 0.8, and the preset accuracy rate is 70%.

4. The method for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 2, characterized in that, The first deformation warping parameters include , , , .

5. The method for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 2, characterized in that, When the simulation deformation data reflecting the degree of deformation and warping of the injection-molded sheet is first obtained, the simulation deformation mode is: warping analysis form is "small deformation", material UDB data is raw material data, and mesh form is "3D mesh"; When the first response to the different trends of change occurs, the warping analysis form is switched from "small deformation" to "large deformation"; When the second response is different from the stated trend, the material UDB data is switched to a preset material, which has the same glass fiber content as the raw material and has Stamp shrinkage data; When the third response differs from the stated trend, the grid is switched to a dual domain or mid planel grid.

6. A system for determining the deformation and warpage parameters of injection-molded sheet metal, characterized in that, include: The data acquisition module is used to acquire simulation deformation data that reflects the degree of deformation and warping of the injection-molded sheet. The data comparison module is used to compare the simulated deformation data with the standard deformation data corresponding to the standard injection molded sheet, and to determine whether the change trend of the simulated deformation data is the same as that of the standard deformation data and whether it meets the measurement index. The parameter saving module is used to modify the first deformation warping parameter corresponding to the simulated deformation data to a second deformation warping parameter in response to the same trend of change but not meeting the measurement index, and to obtain the simulated deformation data corresponding to the second deformation warping parameter again. When the simulated deformation data meets the measurement index when compared with the standard deformation data, the second deformation warping parameter is saved. In response to the different trends of change, the simulation mode when acquiring the simulation deformation data is switched and the simulation deformation data is acquired again, and the simulation deformation data is compared with the standard deformation data again.

7. The system for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 6, characterized in that, The data comparison module includes a correlation comparison unit and an accuracy comparison unit. The data comparison module is used to compare the data of multiple corresponding points in the simulated deformation data and the standard deformation data to obtain the correlation coefficient and the overall accuracy. The correlation comparison unit is used to compare the correlation coefficient with a preset coefficient to determine whether the variation trend of the simulated deformation data and the standard deformation data is the same. The accuracy comparison unit is used to compare the overall accuracy with a preset accuracy to determine whether the simulated deformation data meets the measurement index.

8. The method for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 7, characterized in that, The preset coefficient is 0.8, and the preset accuracy rate is 70%.

9. The method for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 7, characterized in that, The first deformation warping parameters include , , , .

10. The system for determining the deformation and warpage parameters of injection-molded sheet metal according to claim 7, characterized in that, The system for determining the deformation and warpage parameters of the injection-molded sheet further includes a mode switching module, which is used for: When the simulation deformation data reflecting the degree of deformation and warping of the injection-molded sheet is first obtained, the simulation deformation mode is: warping analysis form is "small deformation", material UDB data is raw material data, and mesh form is "3D mesh"; When the first response to the different trends of change occurs, the warping analysis form is switched from "small deformation" to "large deformation"; When the second response is different from the stated trend, the material UDB data is switched to a preset material, which has the same glass fiber content as the raw material and has Stamp shrinkage data; When the third response differs from the stated trend, the grid is switched to a dual domain or mid planel grid.

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