JP3970127B2 - Method and program for generating database file for molding simulation - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a method and a program for generating a database file for molding simulation.
[0002]
[Prior art]
Molding simulation of an injection molded product such as a semiconductor package is performed in consideration of physical characteristics of the molding material, mold shape, mold temperature distribution in the injection molding process, temperature change, and the like. Specifically, for example, for a computer in which finite element method analysis software is installed, 3D CAD data related to the shape of an injection molded product to be analyzed, 3D CAD data related to a mold shape, temperature distribution of a mold, Various data such as resin filling speed or data relating to molding material, that is, resin fluidity are input. Note that data relating to resin fluidity needs to be created in advance using software that can analyze the fluidity of the resin. Then, the computer calculates, based on the input data, each element of the model shape, that is, sink, warp, shrinkage, etc. occurring in each area of the subdivided injection molded product, and the calculated result is calculated for the injection molded product. Output as image information etc. that can grasp the overall deformation.
[0003]
By the way, many general-purpose finite element method analysis software is not suitable for injection molding molding simulation. That is, in order to perform the molding simulation of the injection molded product, the data regarding the fluidity of the resin is required as described above. This data indicates in which direction the resin molded resin flows, and specifically, in the CSV format in which the model to be analyzed is described as the flow direction (angle) of each element. It is a database file. However, analysis software that analyzes resin fluidity may not be able to output such a database file. Therefore, when the database file cannot be output, it is necessary to create the database file with expensive scientific calculation software.
[0004]
[Problems to be solved by the invention]
Therefore, in order to solve the above-described problems, the present invention aims to convert data output from software for analyzing fluidity of a resin into a format that can be used by highly versatile finite element analysis software. .
[0005]
[Means for Solving the Problems]
As means for solving the above problems, the present invention provides a molding simulation for generating a molding simulation database file using a simulation model divided for each element including a plurality of coordinate points based on the shape of an injection molded product. In the method for generating a database file for a first process, a first step of reading a flow analysis result file in which a resin flow analysis result in the model is described in a contour diagram format into a computing device, and data relating to a contour scale of the flow analysis result file Based on a second step of creating a color tone stage data table based on the data and storing the color tone stage data table in the storage device, and a barycentric coordinate file describing the barycentric coordinate point of each element in the model, the barycentric coordinates for one element A third step of reading point data into the arithmetic unit, and reading A plurality of peripheral coordinate points of the barycentric coordinate point based on the data of the barycentric coordinate point, and reading a tone stage at these peripheral coordinate points from a contour diagram of the flow analysis result file; Based on the color tone stage data table held in the storage device, the color tone stages at the plurality of read peripheral coordinate points are compared with each other, and the resin flow in the element including the barycentric coordinate points read from the comparison result A fifth step of calculating the direction and outputting the calculation result as data in a predetermined format; and determining whether or not there is data on the centroid coordinate point of the centroid coordinate file that has not been read into the arithmetic unit; If there is data on the center of gravity coordinate point that has not been read, the third to fifth steps are executed for the center of gravity coordinate point that has not been read. When the data of the center of gravity coordinate point not loaded is not present, and shall be characterized by having a sixth step of the process ends.
[0006]
Therefore, according to the method for generating a database file for molding simulation of the present invention, the flow analysis result of the resin output from the analysis software can be input to the finite element method analysis software using the file describing the contour diagram format. Can create simple files. Therefore, when performing a molding simulation of an injection molded product using the finite element method analysis software, the file output by the analysis software can be used, and it is not necessary to prepare scientific calculation software separately.
[0007]
Further, the present invention provides a molding simulation database file generation program that generates a molding simulation database file using a simulation model divided for each element including a plurality of coordinate points based on the shape of an injection molded product. A color tone stage data table is created based on the first procedure for reading the flow analysis result file describing the flow analysis result of the resin in the model in a contour diagram format into the arithmetic unit and the data relating to the contour scale of the flow analysis result file. Then, from the second procedure for holding the color tone stage data table in the storage device and the centroid coordinate file describing the centroid coordinate points of each element in the model, the data of the centroid coordinate points for one element is stored in the arithmetic unit. A third procedure for reading and the data of the read center-of-gravity coordinate point A plurality of peripheral coordinate points of the center-of-gravity coordinate point based on the data, and a fourth procedure for reading the color tone stage at these peripheral coordinate points from the contour diagram of the flow analysis result file; Based on the color tone step data table held in the storage device, the color tone step at the coordinate point is compared with each other, the flow direction of the resin in the element including the barycentric coordinate point read from the comparison result is calculated, and the calculation result Is output as data of a predetermined format, and it is determined whether or not the data of the centroid coordinate point of the centroid coordinate file that has not been read into the arithmetic unit exists, and the If data exists, the third to fifth steps are executed for the center-of-gravity coordinate points that have not been read, and the center of gravity that has not been read If the data of the gauge is not present, and shall be characterized by having a sixth step of the process ends.
[0008]
Therefore, according to the molding simulation database file generation program of the present invention, as in the above-described molding simulation database file generation method, the file output by the analysis software can be used, There is no need to prepare additional software for scientific calculation.
[0009]
Furthermore, the present invention provides a molding simulation database file generation program that generates a molding simulation database file using a simulation model divided for each element including a plurality of coordinate points based on the shape of an injection molded product. A color tone stage data table is created based on the first procedure for reading the flow analysis result file describing the flow analysis result of the resin in the model in a contour diagram format into the arithmetic unit and the data relating to the contour scale of the flow analysis result file. Then, from the second procedure for holding the color tone stage data table in the storage device and the centroid coordinate file describing the centroid coordinate points of each element in the model, the data of the centroid coordinate points for one element is stored in the arithmetic unit. The third procedure of reading and the read centroid coordinate point A plurality of peripheral coordinate points of the center-of-gravity coordinate point based on the data, and a fourth procedure for reading the color tone stage at these peripheral coordinate points from the contour diagram of the flow analysis result file; Based on the color tone step data table held in the storage device, the color tone steps at peripheral coordinate points are compared with each other, and the flow direction of the resin in the element including the barycentric coordinate point read from the comparison result is calculated and calculated. The fifth procedure for holding the result in the storage device, and determining whether or not the data of the centroid coordinate point of the centroid coordinate file that has not been read into the arithmetic unit exists, If data is present, the third to fifth steps are executed for the center-of-gravity coordinate points that have not been read, and the center-of-gravity coordinate points that have not been read If the data is not present, and shall be characterized by having a sixth step of outputting the data in the flow direction of the resin in all the elements held in the storage device as a file of a predetermined format.
[0010]
Therefore, according to the present invention, the same operation as the above-described program for generating the database file for molding simulation can be obtained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method and a program for generating a database file for forming simulation according to an embodiment of the present invention will be described in detail with reference to the drawings. This molding simulation database file generation method consists of a file describing the flow analysis result of the molded resin in contour diagram format, and the coordinate data of the center of gravity of the element that divides the shape of the molding simulation model into small areas Is output as a CSV format file, and is executed on a computer. Note that the file obtained by the method of generating the molding simulation database file according to the embodiment of the present invention is read into the finite element method analysis software and used for the molding simulation for predicting the warpage of the molded product. The The forming simulation database file generating program according to the embodiment of the present invention executes the forming simulation database file generating method.
[0012]
Here, an example of a computer for executing the method of generating the molding simulation database file will be described. FIG. 10 is a configuration diagram of an example of a computer for executing the forming simulation database file generation method according to the embodiment of the present invention. In FIG. 10, 30 is a computer, 31 is a CPU, 32 is a ROM, 33 is a RAM, 34 is a keyboard, 35 is an FD drive, 36 is a display, 37 is a network interface, and 38 is a bus. The computer 10 includes a CPU 31, ROM 32, RAM 33, keyboard 34, FD drive 35, display 36, network interface 37, and HD drive 38, which are connected by a bus 39. Further, it is connected to the LAN via the network interface 37. The configuration shown in FIG. 10 is merely an example, and other configurations may be used as long as the method for generating the molding simulation database file can be executed.
[0013]
In addition, in order to execute the method of generating the database file for molding simulation according to the embodiment of the present invention, when molding the resin used for molding into the shape of the analysis target model with software capable of flow analysis in advance, It is necessary to analyze how the resin flows and output the analysis result as a file (BMP file) described in a contour diagram format. FIG. 2 is an explanatory diagram of an image file described in a contour diagram format. FIG. 3 is an explanatory diagram showing the relationship between the contour scale and the color tone stage table. 2 and 3, 11 is a contour diagram, 12 is a contour scale, and 13 is a color tone stage table. In addition, the patterns described in the figures in these figures are originally expressed as color tones.
[0014]
The color tone of the contour diagram 11 represents the flow of the resin in time series, and the passage of time during resin molding can be read from the contour scale 12. That is, the contour scale 12 indicates that the time passes from the color tone at the upper end to the color tone at the lower end, that is, as the color tone level increases. Therefore, the resin flows from the color tone at the upper end of the contour scale 12 toward the color tone at the lower end. Then, as will be described later, a color tone stage table 13 is created from the contour scale 12 and held in the RAM 33 of FIG.
[0015]
Further, in order to execute the method for generating the database file for forming simulation according to the embodiment of the present invention, the coordinate data of the center of gravity in each element of this model is obtained from CAD data related to the shape of the model to be analyzed by 3D CAD software or the like. Must be output as a file described in CSV format. FIG. 4 is an explanatory diagram of the elements of the forming model and the barycentric coordinate data. In FIG. 4, 15 is an element, 16 is a center of gravity, and 24 is a partial region of the model. That is, the coordinate data of the barycentric point 16 of the element 15 obtained by dividing the shape of the model to be analyzed into small regions is required. Note that the files described in the following description are recorded in the FD.
[0016]
FIG. 1 is a flowchart showing an example of a method for generating a molding simulation database file according to an embodiment of the present invention. As shown in S <b> 1, the computer 10 reads a file describing the analysis result of the resin in the contour diagram format via the FD drive 35 of FIG. 10. Next, as shown in S2, a color tone stage table 13 is created from the contour scale 12 and stored in the RAM 33 of FIG.
[0017]
Then, as shown in S3, the coordinate data of the barycentric point 16 is read from the file in which the coordinate data of the barycentric point 16 is described in the CSV format via the FD drive 35. Next, as shown in S4, the flow direction of the resin at the center of gravity 16 is calculated. Here, the calculation method of the flow direction will be described in detail. FIG. 5 is an explanatory diagram showing the relationship between the center of gravity of one element of the molding model and the contour diagram. In FIG. 5, reference numeral 23 denotes a partial region of the contour diagram. FIG. 6 is a cross-sectional view showing a setting example of concentric circles centered on the center of gravity. In FIG. 6, 17 indicates a circle A centered on the center of gravity point, and 18 indicates a circle B centered on the center of gravity point. Further, FIG. 7 is an explanatory diagram of a method for determining the flow direction of the resin, (a) shows a method for determining the flow direction of the resin for each circle from the color tone stage of the investigation point, and (b) is a barycentric point. Shows a method of determining the flow direction of the resin. In FIG. 7, 19 a to p are survey points, 20 is a flow direction based on a point on the circle A, 21 is a flow direction based on a point on the circle B, and 22 is a calculated flow direction. Moreover, FIG. 8 is explanatory drawing which shows the flow direction of resin on a contour figure.
[0018]
As shown in FIG. 5, there are areas of various tone steps around the center of gravity point 16, and in order to calculate the flow direction of the resin at the center of gravity point 16, the tone steps of the surrounding region are examined, It is necessary to compare the examined tone stages with each other. Therefore, as shown in FIG. 6, first, two circles having different radii with the center of gravity 16 as the center are set. Then, as shown in FIG. 7A, eight color tone stage survey points 19a to 19h and 19i to 19p are set in a circle A17 centered on the center of gravity and a circle B18 centered on the center of gravity. To do.
[0019]
Next, the color tone corresponding to each check point in the contour diagram 11 is read, and it is checked which color tone in the color tone stage table 13 corresponds to the read color tone. Then, in these circles, the color tone levels of each survey point are compared with each other, and the lowest color tone level and the highest color tone level are determined. For example, in the example shown in FIG. 7A, in the circle A17 centered on the center of gravity, the color tone level of the survey point 19e is the highest, the color tone level of the survey point 19a is the lowest, and the center of gravity is the center. In the circle B18, the color tone level of the survey point 19i is the lowest, and the color tone level of the survey point 19m is the highest. As described above, the resin flows from the low tone stage area to the high tone stage area. Therefore, in the circle A17 centering on the center of gravity, it can be considered that the resin flows in the direction of the flow direction 20 based on the point on the circle A. Similarly, it can be said that the circle B18 centering on the center of gravity is flowing in the direction of the flow direction 21 based on the point on the circle B.
[0020]
Further, as shown in FIG. 7B, in order to more accurately calculate the resin flow direction at the center of gravity point 16, the direction indicated by the flow direction 20 based on the points on the circle A and the points on the circle B A direction intermediate between the direction of the flow direction 21 based on the above is calculated. The calculated flow direction 22 is set as the flow direction at the center of gravity 16 in FIG. It is described as an angle with respect to a predetermined direction. The above is the detailed processing procedure in S4.
[0021]
In the above example, two circles centered on the center of gravity are set. However, in order to calculate the flow direction of the resin more accurately, three or four in the range near the center of gravity are used. It is preferable to set as described above. Also, it is preferable to set the number of survey points on these circles to 8 or more, for example, 32 or 64.
[0022]
Returning to FIG. 1, in order to output the data related to the flow direction indicated as the calculated flow direction 22 to the outside as shown in S5, this data is output to the FD via the FD drive 35 as a CSV file. Write. Next, as shown in S6, it is determined whether or not there is coordinate data of the center of gravity point that has not been read from the file described in the CSV format. If there is coordinate data of the barycentric point that has not been read, the processes from S3 to S5 are performed on the coordinate data. If there is no coordinate data of the center of gravity point that has not been read, all the processes are terminated. The generation simulation database file generation program is realized by coding the above processing procedure in C language or the like.
[0023]
By the way, the processing up to S5 and S6 is not limited to the above-described processing procedure, and may be replaced with the processing procedure shown in S15 to S17 shown in FIG. FIG. 9 is a flowchart showing a modification of the forming simulation database file generation method according to the embodiment of the present invention. That is, in the method shown in FIG. 10, in S15, the calculated flow direction 22 is temporarily stored in the RAM 33 or the like without being written in the FD. Next, in S16, the same determination as in S6 is performed. If there is no coordinate data of the barycentric point that has not been read, as shown in S17, data relating to all the flow directions held in the RAM 33 or the like may be written to the FD all at once. In the case of this processing procedure, it cannot be executed unless the capacity of the memory such as the RAM 33 is considerably large, but writing to the FD is performed only once, and the writing time to the FD can be shortened.
[0024]
In addition, following the processing shown in S6 or S17 above, the flow direction data, separately prepared three-dimensional CAD data and molding condition data are passed to the finite element method analysis software, and the prediction is made to the finite element method analysis software. A processing procedure for starting calculation of warpage or the like may be added. Further, the coordinate data file of the center of gravity of each element of the model read in S3 may be a database file other than the CSV format. In addition, the data related to the flow direction output in S5 may be output as a database file other than the CSV format as necessary. Also, an interface for executing the above processing procedure can be created based on HTML so that it can be easily executed on a Web browser.
[0025]
【The invention's effect】
As described above, according to the present invention, a molding simulation database file for generating a molding simulation database file using a simulation model divided for each element including a plurality of coordinate points based on the shape of an injection molded product. In the generation method, a first step of reading a flow analysis result file in which a resin flow analysis result in the model is described in a contour diagram format into an arithmetic device, and a color tone step based on data relating to a contour scale of the flow analysis result file From the second step of creating a data table and storing the color tone stage data table in the storage device, and the barycentric coordinate file describing the barycentric coordinate point of each element in the model, the data of the barycentric coordinate point for one element is obtained. A third step of reading into the arithmetic unit and the barycentric coordinates read A plurality of peripheral coordinate points of the center-of-gravity coordinate points based on the data, and a fourth step of reading the color tone stage at these peripheral coordinate points from the contour diagram of the flow analysis result file; A fifth step of comparing the tone stages at the peripheral coordinate points with each other, calculating the flow direction of the resin in the element including the barycentric coordinate point read from the comparison result, and outputting the calculation result as data in a predetermined format; It is determined whether or not the data of the centroid coordinate point of the centroid coordinate file that has not been read into the arithmetic unit exists, and if the data of the centroid coordinate point that has not been read exists, The third to fifth steps are executed for the point, and if there is no data on the center-of-gravity coordinate point that has not been read, the process ends. Because a configuration having a step can create a database file for molding simulation from flow analysis result data by the contour diagram form. Therefore, it is not necessary to introduce expensive scientific calculation software, and it is possible to easily perform a simulation operation for predicting warpage of an injection molded product.
[0026]
[Brief description of the drawings]
FIG. 1 is a flowchart showing an example of a method for generating a molding simulation database file according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of an image file described in a contour diagram format.
FIG. 3 is an explanatory diagram showing a relationship between a contour scale and a color tone stage table.
FIG. 4 is an explanatory diagram of molding model elements and barycentric coordinate data.
FIG. 5 is an explanatory diagram showing a relationship between a center of gravity point of one element of a molding model and a contour diagram.
FIG. 6 is a cross-sectional view showing an example of setting a concentric circle centered on a center of gravity point.
FIG. 7 is an explanatory diagram of a method for determining the flow direction of resin.
FIG. 8 is an explanatory diagram showing the flow direction of the resin on the contour diagram.
FIG. 9 is a flowchart showing a modification of the method for generating a molding simulation database file according to the embodiment of the present invention.
FIG. 10 is a configuration diagram of an example of a computer for executing a method for generating a molding simulation database file according to an embodiment of the present invention.
[Brief description of symbols]
11 Contour figure 12 Contour scale 13 Color tone stage table 14 Center of gravity coordinate data 15 Element 16 Center of gravity point 17 Circle A centered on the center of gravity
18 Circle B centered on the center of gravity
20 Flow direction based on points on circle A 21 Flow direction based on points on circle B 22 Calculated flow direction 23 Partial area of contour diagram 24 Partial area of model 30 Computer 31 CPU
32 ROM
33 RAM
34 Keyboard 35 FD drive 36 Display 37 Network interface 38 HD drive 39 Bus

Claims (3)

In a method for generating a database file for molding simulation that generates a database file for molding simulation using a simulation model divided for each element including a plurality of coordinate points based on the shape of an injection molded product,
A first step of reading a flow analysis result file describing a flow analysis result of the resin in the model in a contour diagram format into an arithmetic device;
A second step of creating a color tone stage data table based on the data relating to the contour scale of the flow analysis result file, and holding the color tone stage data table in a storage device;
A third step of reading data of the centroid coordinate point for one element from the centroid coordinate file in which the centroid coordinate point of each element in the model is described;
A fourth step of setting a plurality of peripheral coordinate points of the barycentric coordinate point based on the read data of the barycentric coordinate point and reading a color tone stage at these peripheral coordinate points from the contour diagram of the flow analysis result file; ,
Based on the color tone stage data table held in the storage device, the color tone stages at the plurality of read peripheral coordinate points are compared with each other, and the resin flow in the element including the barycentric coordinate points read from the comparison result A fifth step of calculating a direction and outputting the calculation result as data in a predetermined format;
It is determined whether or not the data of the barycentric coordinate point of the barycentric coordinate file that has not been read into the arithmetic unit exists, and when the data of the barycentric coordinate point that has not been read exists, The molding is characterized by including a sixth step of executing the third step to the fifth step with respect to a point and ending the processing when there is no data of the barycentric coordinate point that has not been read. How to create a database file for simulation. In a molding simulation database file generation program that generates a molding simulation database file using a simulation model divided for each element including a plurality of coordinate points based on the shape of an injection molded product,
A first procedure for reading a flow analysis result file in which the flow analysis result of the resin in the model is described in a contour diagram format into an arithmetic device;
A second procedure of creating a color tone stage data table based on the data relating to the contour scale of the flow analysis result file and holding the color tone stage data table in a storage device;
A third procedure for reading data of centroid coordinate points for one element from the centroid coordinate file in which the centroid coordinate points of each element in the model are described;
A fourth procedure for setting a plurality of peripheral coordinate points of the centroid coordinate point based on the read data of the centroid coordinate point, and reading a color tone stage at these peripheral coordinate points from a contour diagram of the flow analysis result file; ,
Based on the color tone stage data table held in the storage device, the color tone stages at the plurality of read peripheral coordinate points are compared with each other, and the resin flow in the element including the barycentric coordinate points read from the comparison result A fifth procedure for calculating a direction and outputting the calculation result as data in a predetermined format;
It is determined whether or not the data of the centroid coordinate point of the centroid coordinate file that has not been read into the arithmetic unit exists, and if the data of the centroid coordinate point that has not been read exists, The molding is characterized in that the third step to the fifth step are executed with respect to a point, and there is a sixth procedure for ending the process when there is no data of the center-of-gravity coordinate point that has not been read. A database file generation program for simulation. In a molding simulation database file generation program that generates a molding simulation database file using a simulation model divided for each element including a plurality of coordinate points based on the shape of an injection molded product,
A first procedure for reading a flow analysis result file in which the flow analysis result of the resin in the model is described in a contour diagram format into an arithmetic device;
A second procedure of creating a color tone stage data table based on the data relating to the contour scale of the flow analysis result file and holding the color tone stage data table in a storage device;
A third procedure for reading data of centroid coordinate points for one element from the centroid coordinate file in which the centroid coordinate points of each element in the model are described;
A fourth procedure for setting a plurality of peripheral coordinate points of the centroid coordinate point based on the read data of the centroid coordinate point, and reading a color tone stage at these peripheral coordinate points from a contour diagram of the flow analysis result file; ,
Based on the color tone stage data table held in the storage device, the color tone stages at the plurality of read peripheral coordinate points are compared with each other, and the resin flow in the element including the barycentric coordinate points read from the comparison result A fifth procedure for calculating a direction and holding the calculation result in the storage device;
It is determined whether or not the data of the centroid coordinate point of the centroid coordinate file that has not been read into the arithmetic unit exists, and if the data of the centroid coordinate point that has not been read exists, When the third step to the fifth step are executed for the point and there is no data on the center-of-gravity coordinate point that has not been read, the flow direction of the resin in all the elements held in the storage device A program for generating a database file for forming simulation, comprising a sixth procedure for outputting data as a file of a predetermined format.

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