JP4715462B2 - Molding analysis method and molding analysis apparatus - Google Patents

Description

  The present invention relates to a multilayer molding analysis, and more particularly to a molding analysis method and a molding analysis apparatus for calculating the position of an intermediate layer in a multilayer compression molding process.

Compression molding is a molding method in which molten resin is dropped into a mold and molded into a desired shape with a clamping force. Compression molding has long been used for glass cups and thermosetting resins.
In recent years, application to thermoplastic resins has increased, and there are cases where products that have been conventionally molded by injection molding are molded by compression molding.

  Since compression molding can be performed at a lower temperature than injection molding, it has a feature that it can suppress deterioration of the resin due to thermal history. As for multilayering, compression molding has a higher degree of freedom than injection molding has a limited layer structure, and multilayering of various resins is possible. Furthermore, in terms of productivity, injection molding is mass-produced with multi-cavity molds, but in the case of wide-mouth molded products, the number of molds for the same mold area is reduced, so the production efficiency decreases. Can be handled only by increasing the number of rotary molds, and since this efficiency is not reduced, it is relatively advantageous.

Caps for beverage containers such as bottles and jars are one example of producing thermoplastic resin by compression molding.
In the field of such packaging containers for foods and the like, products are often multilayered using a resin with low gas permeability in order to prevent oxidation and moisture prevention of the contents.

  In multilayer compression molding, in order to ensure such product performance, it is required to mold the layer distribution and thickness into a prescribed form. In particular, when used as a packaging container for food, etc., the outer layer is completely covered with a resin that has little influence on the contents from the viewpoint of hygiene, while a functional resin such as an oxygen barrier is included as an intermediate layer. It is required to spread evenly.

In order to obtain a desired molded article in which the intermediate layer is optimally distributed, it is important that the intermediate layer is arranged in an appropriate shape in the resin before being subjected to compression molding. In addition, in order to obtain the optimal arrangement of the intermediate layer in the initial shape of the entire layer before compression molding, it is necessary to grasp the resin behavior during the compression process.
Obtaining this resin behavior experimentally is very complicated and difficult to carry out realistically.
For this reason, the development of a method for visualizing the behavior of the resin during the compression process by numerical analysis has been demanded.

As a method for visualizing such resin behavior, an adaptive mesh method has been conventionally used (see, for example, Non-Patent Document 1).
The adaptive mesh method is a method of performing analysis while repeatedly correcting a mesh in a region that is deformed according to molding.

That is, in this adaptive mesh method, as shown in FIG. 11, the mesh is also deformed in accordance with the deformation of the entire resin by compression molding of the resin. However, when the shape change of the resin is large, the shape of the mesh is deformed to such an extent that the calculation cannot be continued any more.
Therefore, as shown in FIG. 12, mesh resetting (remeshing) is repeated until the collapse of the mesh becomes large and further calculation cannot be continued.
Thus, even when the shape of the resin changes greatly due to compression molding, it is possible to sequentially track the resin behavior until the molding is completed.

  When such an adaptive mesh method is applied to multilayer compression molding, remeshing is performed for each region corresponding to each resin layer. Since the interface is maintained as it is during remeshing, the boundary between the layers can be clearly obtained.

Hodaka Fukahori: Molding Symposia '02 Abstract, 283 (2002)

However, when this adaptive mesh method is applied to a resin structure having a small amount of intermediate layer, if the intermediate layer becomes too thin due to molding, it becomes impossible to create a mesh in that layer, and the calculation is continued. There was a problem that it was impossible.
It may be possible to cope with such a problem by creating a finer mesh. However, the finer the mesh, the longer the calculation time. Therefore, depending on the thickness of the intermediate layer, it is difficult to use it practically.
Therefore, for thin intermediate layers such as functional resins, which have been increasing in recent years, it has been very difficult to analyze the resin behavior in compression molding.
For this reason, in the multilayer compression molding of resin provided with such an intermediate layer, a method capable of appropriately analyzing the behavior of the resin is required.

Therefore, as a result of intensive studies, the inventors of the present invention have developed a point tracking method and a global tracking method to compensate for the disadvantages of multilayer compression molding analysis by the adaptive mesh method.
In the point tracking method, the compression molding process is analyzed in a single layer using the adaptive mesh method, and points are placed on the initial shape of the entire layer using this analysis result, and the points are tracked. This is a method for obtaining the position of the intermediate layer after molding.
In addition, the global tracking method is not only the portion corresponding to the intermediate layer, but also by placing points on the entire layer to perform point tracking, and by determining the correspondence of resin movement before and after molding, In this method, the initial coordinate value of each point group located in a desired intermediate layer is overlapped with the initial resin shape to obtain the desired arrangement of the initial intermediate layer shape.

  That is, according to the present invention, in the multilayer compression molding, the position of the intermediate layer after molding can be obtained, and the intermediate layer distribution in the initial resin shape can be generated in which the distribution of the intermediate layer after molding is optimal. An object is to provide a molding analysis method and a molding analysis apparatus.

  In order to achieve the above object, the molding analysis method of the present invention is a molding analysis method for causing a molding analysis device to calculate a layer distribution in a molding process, wherein the layer shape change analysis means in the molding analysis device defines a predetermined layer. Analyzing based on the analysis conditions, calculating the analysis result consisting of the coordinate information of the nodes of the mesh assigned to the layer and the physical quantity including the velocity vector of the nodes for each predetermined time step, and the point tracking means in the molding analyzer However, at every predetermined time step, the analysis result is read, the velocity vector at each point is calculated based on the analysis result and the coordinate information of one or more arbitrary points assumed in the layer. The coordinate information of each point after the time step is calculated, and the analysis result reading, the velocity vector calculation, and the coordinate information calculation are repeated until a predetermined time elapses. Is a method of calculating the coordinate information of the predetermined time after the arbitrary point that was assumed in the layer.

If the forming analysis method is such a method, a point can be arranged at the position of the intermediate layer in the initial shape of the entire layer, and the movement of the point in the forming process can be traced.
For this reason, for any initial intermediate layer shape, the change in the intermediate layer distribution due to molding can be calculated, and a small amount of intermediate layer shape change, which has been difficult in the past, can be properly grasped.
In addition, according to the present invention, it is possible to perform point tracking for various shapes of the intermediate layer by performing a single layer shape change analysis.
For this reason, it becomes possible to perform more efficient forming analysis as compared with the forming analysis method based only on the conventional adaptive mesh method.

  Further, according to the molding analysis method of the present invention, the global point tracking means in the molding analysis apparatus reads the analysis result for each predetermined time step, and the coordinate information and initial values of all the nodes in the first time step in the analysis result. The coordinate value is stored in the global point tracking result storage unit, the node is tracked for a predetermined time step by the point tracking unit, the coordinate information of each node after the predetermined time step is calculated, Generate initial coordinate value distribution of each node after time step, read analysis result, store coordinate information and initial coordinate value of each node after predetermined time step based on analysis result, predetermined time step Predetermined calculation of coordinate information of each node after a predetermined time step by point tracking for each subsequent node and generation of initial coordinate value distribution of each node after the predetermined time step Repeat to between elapses, there as a method of calculating the coordinate information and the initial coordinate value distribution after a predetermined time of all the nodes in the first time step in the analysis results.

If the forming analysis method is such a method, point tracking can be performed while retaining the initial coordinate values for all the nodes of the mesh assigned to the layer.
For this reason, it is possible to grasp the initial coordinate value distribution of the tracked points in the final shape of the entire layer after molding.

  Further, the molding analysis method of the present invention is such that the initial intermediate layer shape generation means in the molding analysis apparatus has a final shape of the entire layer constituted by coordinate information after a predetermined time of all nodes calculated by the global point tracking means. Based on the coordinate information of a large number of points in the arbitrary intermediate layer shape specified above, the initial coordinate value corresponding to the point is calculated based on the coordinate information and the initial coordinate value stored in the global point tracking result storage means. Then, these initial coordinate value points are superimposed on the initial layer shape information of the entire layer to generate initial shape information corresponding to the intermediate layer shape.

If the forming analysis method is such a method, it is possible to generate the initial shape information of the intermediate layer in the initial shape of the entire layer corresponding to the intermediate layer having an arbitrary shape after forming.
For this reason, even with a small amount of the intermediate layer, it is possible to obtain an ideal intermediate layer distribution in the initial shape of the entire layer, which can obtain an optimal intermediate layer after molding.

  Further, in the molding analysis method of the present invention, the point tracking means, when the coordinate information of one or more arbitrary points assumed in the layer does not match the coordinate information of the node in the analysis result, in the analysis result, This is a technique for calculating a velocity vector at an arbitrary point by interpolation calculation using velocity vectors corresponding to nodes around the arbitrary point.

If the forming analysis method is such a method, the physical quantity such as the velocity vector of the point is calculated by performing the interpolation calculation for the point in the part where the mesh node is not allocated by analyzing the layer shape change. can do.
For this reason, it becomes possible to perform point tracking appropriately also about such a point.

  The molding analysis apparatus of the present invention is a molding analysis apparatus that calculates a layer distribution in a molding process, analyzes a layer based on a predetermined analysis condition, and coordinates information of the nodes of the mesh allocated to the layer and the nodes. The layer shape change analysis means for calculating the analysis result consisting of the physical quantity including the velocity vector at every predetermined time step, and reading the analysis result at every predetermined time step, and this analysis result and the layer assumed Calculate the velocity vector at each point based on the coordinate information of one or more arbitrary points, calculate the coordinate information of each point after a predetermined time step, read the analysis result, and calculate the velocity vector And a point tracking unit that repeats the calculation of the coordinate information until a predetermined time elapses, and calculates coordinate information after a predetermined time of an arbitrary point assumed in the layer. That.

With such a configuration of the molding analysis apparatus, it is possible to track the movement in the molding process at any point in the initial shape of the entire layer, and therefore it is possible to grasp the shape change of a small amount of the intermediate layer. .
In addition, it is possible to perform more efficient forming analysis than conventional forming analysis methods because it is possible to perform point tracking for various shapes of intermediate layer shapes by performing layer shape change analysis only once. It becomes.

  Further, the molding analysis apparatus of the present invention reads the analysis result at every predetermined time step, and stores the coordinate information and initial coordinate values of all the nodes in the first time step in the analysis result in the global point tracking result storage means. Storing the node, tracking the node for a predetermined time step by the point tracking means, calculating coordinate information of each node after the predetermined time step, and initial coordinate value distribution of each node after the predetermined time step And by reading the analysis result, storing the coordinate information and initial coordinate value of each node after a predetermined time step based on the analysis result, and further tracking the point for each node after the predetermined time step. The calculation of the coordinate information of each node after the time step and the generation of the initial coordinate value distribution of each node after the predetermined time step are repeated until the predetermined time elapses. A configuration equipped with first global point tracking means for calculating the coordinate information and the initial coordinate value distribution after a predetermined time of all the nodes in time step that.

  If the forming analysis apparatus is configured in this way, it is possible to carry out point tracking by retaining the initial coordinate values for all the nodes of the mesh assigned to the layer, and it is tracked in the final shape of the entire layer after forming. It becomes possible to grasp the initial coordinate value distribution of the points.

  In addition, the molding analysis apparatus of the present invention has a large number of arbitrary intermediate layer shapes specified on the final shape of the entire layer constituted by coordinate information after a predetermined time of all nodes calculated by the global point tracking means. Based on the coordinate information of the point, the initial coordinate value corresponding to the point is calculated based on the coordinate information and the initial coordinate value stored in the global point tracking result storage means, and the point of these initial coordinate values is calculated for the entire layer. The initial intermediate layer shape generating means for generating initial shape information corresponding to the intermediate layer shape is superimposed on the initial shape information.

  By configuring the molding analysis device in this way, it is possible to generate the initial shape information of the intermediate layer in the initial shape of the entire layer, which can obtain the optimal intermediate layer after molding, and the ideal intermediate layer It becomes possible to grasp the initial shape.

  Further, in the molding analysis apparatus of the present invention, when the point tracking means, the coordinate information of one or more arbitrary points assumed in the layer does not match the coordinate information of the nodes in the analysis result, in the analysis result, A velocity vector at an arbitrary point is calculated by interpolation calculation using velocity vectors corresponding to nodes around the arbitrary point.

  If the forming analysis device is configured in this way, the velocity vector can be calculated by interpolation calculation even for the part where the mesh nodes are not allocated in the analysis of the layer shape change, and the point tracking should be performed appropriately. Is possible.

According to the present invention, it is possible to visualize the multilayer resin behavior in a large deformation molding process such as compression molding. In addition, by tracking a large number of points arranged in the entire layer, it is possible to predict an initial layer configuration that achieves a desired layer arrangement after molding.
For this reason, even when the thickness of the intermediate layer is small, analysis can be performed, and an ideal intermediate layer distribution in the initial shape of the entire layer can be obtained. In addition, it is possible to analyze a plurality of intermediate layer shapes by performing analysis of the shape change of the entire layer once.
Therefore, according to the present invention, product development using multilayer compression molding or the like can be made efficient.

Hereinafter, a preferred embodiment of a compression molding analysis apparatus according to the present invention will be described with reference to the drawings.
In addition, the compression molding analysis apparatus of this invention shown to the following embodiment operate | moves with the computer controlled by the program. The CPU of the computer sends a command to each component of the computer based on the program, and performs predetermined processing necessary for the operation of the compression molding analysis apparatus, for example, analysis processing of layer shape change, coordinate acquisition processing of tracking points, tracking A point velocity vector calculation process, an initial coordinate distribution generation process, and the like are performed. Thus, each process and operation in the compression molding analysis apparatus of the present invention can be realized by specific means in which the program and the computer cooperate.

The program is stored in advance in a recording medium such as a ROM and a RAM, and is executed by causing the computer to read the program from a recording medium mounted on the computer. For example, the program may be read by the computer via a communication line.
Further, the recording medium for storing the program can be constituted by, for example, a semiconductor memory, a magnetic disk, an optical disk, or any other recording means that can be read by any computer.

[First embodiment]
First, the configuration of the first embodiment of the present invention will be described with reference to FIG. This figure is a block diagram showing the configuration of the compression molding analysis apparatus of the present embodiment.
As shown in FIG. 1, the compression molding analysis apparatus 10 of this embodiment includes a model file storage unit 10a, an analysis condition input unit 10b, a layer shape change analysis unit 10c, an analysis result storage unit 10d, and an intermediate layer shape information input unit 10e. , A point tracking unit 10f and a point tracking result storage unit 10g.

The model file storage unit 10a stores a model file as analysis target data in the layer shape change analysis process.
This model file holds information on the shape of the mold, information on the shape of the resin region in the initial state (initial shape of the entire layer), and the like.
The model file is created in a state that can be read by the layer shape change analysis unit 10c formed by the execution of the fluid analysis software using CAD software, mesh generation software, or the like.
The shape information is constituted by coordinate information of a large number of points. In the present embodiment, two-dimensional information is assumed as the coordinate information, but the coordinate information may be three-dimensional information.

The analysis condition input unit 10b inputs a condition for analyzing the layer shape change in the compression molding process to the compression molding analysis apparatus 10, and the layer shape change analysis unit 10c enables the use of this analysis condition. It is stored in the device 10.
Examples of the analysis conditions include physical properties of the mold and the resin, molding speed, heat between the mold and the resin, slip boundary conditions, mesh correction conditions, analysis time step, and the like.

The layer shape change analysis unit 10c analyzes a layer shape change, and is configured on a CPU and a memory in the compression molding analysis device 10 by executing predetermined fluid analysis software.
As this fluid analysis software, for example, “POLYFLOW” sold by FLUENT can be used.
The layer shape change analysis unit 10c reads a model file for fluid analysis from the model file storage unit 10a, and also reads analysis conditions input from the analysis condition input unit 10b, and executes analysis processing.

The analysis processing by the layer shape change analysis unit 10c can be executed by the procedure shown in “Numerical analysis of compression molding process” described in Non-Patent Document 1 proposed by the inventor of the present invention.
That is, the layer shape change analysis unit 10c calculates the shape change of the entire layer based on the analysis conditions by an analysis method using the adaptive mesh method.

At this time, the layer shape change analysis unit 10c repeats correction (remeshing) before the mesh crushed by molding becomes impossible to calculate, and continues to calculate the shape change from that state until the final shape.
Thereby, the shape change from the initial shape to the final shape of the entire layer is analyzed.

At this time, depending on the shape, the mesh size and the time step of analysis can be changed as needed.
When the layer shape change is small and the mesh need not be corrected, the layer shape change analysis unit 10c can analyze the layer shape change without using the adaptive mesh method.

The analysis result storage unit 10d stores the analysis result calculated by the layer shape change analysis unit 10c.
This analysis result includes coordinate information and physical quantities of all nodes in the mesh for each predetermined time step in the process of forming the entire layer from the initial shape to the final shape.
As the physical quantity, a physical quantity to be calculated can be set as the analysis condition. For example, the physical quantity can include a velocity vector, pressure, temperature, stress and the like at each node.

The intermediate layer shape information input unit 10e inputs the coordinate information of the point corresponding to the intermediate layer shape that is the target of point tracking to the compression molding analysis apparatus 10 so that it can be used by the point tracking unit 10f. It is stored in the device 10.
As the points corresponding to the intermediate layer shape, a point that can determine the intermediate layer shape is specified on the contour and inside the region of the intermediate layer shape. Note that this specification can be performed manually as well as automatically by a computer.

The point tracking unit 10f tracks the change in the coordinates of the point corresponding to the intermediate layer shape at every predetermined time step in the process of forming the entire layer from the initial shape to the final shape. By executing, it is configured on the CPU and memory in the compression molding analysis apparatus 10.
As the fluid analysis software, for example, post-processor software “FIELDVIEW” (developed by Intelligent Light Corporation of the United States) sold by Vinus Corporation can be used.

The point tracking unit 10f reads the analysis result of the layer shape change from the analysis result storage unit 10d, and also reads the coordinate information of the point corresponding to the intermediate layer shape input from the intermediate layer shape information input unit 10e, and performs point tracking processing Execute.
In this point tracking process, the point tracking unit 10f calculates a velocity vector at the coordinates of a point to be point-tracked (hereinafter sometimes referred to as a tracking point) based on the analysis result of the layer shape change. Then, based on the velocity vector and the point coordinate information, the point coordinate information in the next time step is calculated.

At this time, if the tracking point matches the node in the analysis result, the point tracking unit 10f uses the velocity vector stored in the analysis result storage unit 10d in association with the node, and uses this as it is for the tracking point. Calculated as a velocity vector.
If the tracking point does not coincide with the node in the analysis result, the velocity vector is calculated by interpolation calculation described later using the velocity vector stored in the analysis result storage unit 10d in association with the node surrounding the node. calculate.
The point tracking unit 10f executes these calculation processes for every point to be tracked for every predetermined time step until the analysis end time.
Thereby, the point tracking unit 10f can calculate to which coordinate each point corresponding to the initial intermediate layer shape moves at the analysis end time, and can calculate the intermediate layer distribution after molding.

  FIG. 2 is a diagram showing the state of such point tracking. According to the point tracking method by the compression molding analysis apparatus 10 of the present embodiment, as shown in the figure, a point corresponding to the shape of the intermediate layer is placed on the initial shape (a) as a tracking target (b), By tracking this point by the point tracking process, the intermediate layer distribution (c) after molding can be calculated.

The point tracking result storage unit 10g stores the tracking result calculated by the point tracking unit 10f.
This tracking result includes coordinate information and physical quantities of all nodes in the mesh for every predetermined time step, and also includes coordinate information of all points to be tracked.

  Next, a processing procedure in the compression molding analysis apparatus 10 of the present embodiment will be described with reference to FIGS. FIG. 3 is a flowchart showing a layer shape change analysis process executed by the compression molding analysis apparatus 10 of the present embodiment, and FIG. 4 is a flowchart showing a point tracking process executed by the apparatus. In FIGS. 3 and 4, a portion displayed by a dotted line is a portion performed by a person. In the following embodiments, the same format is used.

First, with reference to FIG. 3, the analysis process of a layer shape change is demonstrated.
First, a model file is created as analysis target data in the layer shape change analysis process (step 10).
This model file holds mold shape information and initial shape information of the entire layer.
Then, the created model file is stored in the model file storage unit 10a in the compression molding analysis apparatus 10 (step 11).

  Next, analysis conditions for layer shape change are set (step 12). As described above, the analysis conditions may be physical properties of the mold and resin, molding speed, time step of analysis, and the like. In addition, the analysis conditions such as whether or not to output the velocity vectors of all the nodes at each time step as analysis results are set by the fluid analysis software to be used.

The analysis condition input unit 10b in the compression molding analysis apparatus 10 inputs and stores the set analysis condition in the compression molding analysis apparatus 10 and makes it available to the layer shape change analysis unit 10c (step 13).
Then, the layer shape change analysis unit 10c uses the model file stored in the model file storage unit 10a to execute a layer shape change analysis process based on the analysis conditions input by the analysis condition input unit 10b (step 14). ).
Finally, the layer shape change analysis unit 10c stores the analysis result in the analysis result storage unit 10d (step 15).

Next, the point tracking process will be described with reference to FIG.
First, an initial intermediate layer shape to be analyzed is arbitrarily determined (step 30). For example, the initial shape of the entire layer is displayed on a display or the like connected to the compression molding analysis apparatus 10, and an arbitrary intermediate layer shape is drawn and input on the screen inside the initial shape. be able to.

Next, a point is created on and / or inside the contour so that the shape of the initial intermediate layer can be understood, and this is input to the compression molding analyzer 10 (step 31). This can be automatically performed by the intermediate layer shape information input unit 10e in the compression molding analyzer 10 based on the initial intermediate layer shape information input to the compression molding analyzer 10 in step 30.
Next, the point tracking unit 10f in the compression molding analysis apparatus 10 reads the analysis result at the first time step (time to start the layer shape change) from the analysis result storage unit 10d (step 32). Thereafter, when the step 32 is repeatedly executed, the analysis results stored in the analysis result storage unit 10d are sequentially read for each time step.

  Next, the point tracking unit 10f in the compression molding analyzer 10 determines a tracking target point (tracking point) (step 33). The tracking points can be all points input in step 31. Also, only some of these points can be determined as tracking points.

Note that the order of the process of step 32 and the process of step 33 can be switched. That is, first, after the tracking point is determined from the point input in step 31, the analysis result can be read only for the determined tracking point. At this time, for a node that matches the tracking point, the analysis result of the node can be read. For tracking points that do not match the nodes, the analysis results of the nodes around the tracking points can be read.
In this way, the analysis result can be read only for the points that are actually tracked, so that the processing load of the compression molding analysis apparatus 10 can be reduced. For this reason, it is also preferable to do this when there is not enough memory or when the number of points input in step 31 is large.

And the point tracking part 10f acquires the coordinate information of the point of tracking object (step 34). As this coordinate information, the coordinate information of the point input in step 31 can be used.
Next, the point tracking unit 10f calculates a velocity vector at the tracking point (step 35). When the tracking point matches one of the nodes included in the analysis result, the velocity vector held in the analysis result can be used as the physical quantity of the matching node as it is. Further, when the tracking point does not coincide with the node, it is calculated by interpolation calculation from the velocity vectors of the nodes around the tracking point.

As the interpolation calculation method, various conventionally known methods can be used. For example, a finite element method using an isoparametric element using a shape function can be used.
As a specific example of the finite element method using an isoparametric element, for example, a method in which a physical quantity inside a two-dimensional element having four nodes is interpolated from a physical quantity of four nodes by a shape function can be cited. Of course, it is also possible to perform interpolation calculation using more nodes.

Next, the point tracking unit 10f calculates the coordinate information of the position of the point in the next time step from the coordinate information and the velocity vector of the tracking point, and stores this in the point tracking result storage unit 10g for each time step ( Step 36).
And the process of step 34-step 36 is repeated about all the tracking points (No of step 37).

When the calculation of the coordinate information of the position of the point in the next time step and the storage of the coordinate information in the point tracking result storage unit 10g for all the tracking points is completed (Yes in step 37), the analysis end time is then reached. Is determined (step 38).
If the analysis end time has not been reached (No in step 38), the processing from step 32 to step 37 is repeated for the next time step. If the analysis end time has been reached (Yes in step 38), the tracking point processing is performed. Exit.

As described above, according to the compression molding analysis apparatus 10 of this embodiment, it is possible to place a point at the position of the intermediate layer in the initial shape of the entire layer and track this.
Therefore, any initial intermediate layer shape can be tracked, and a small amount of intermediate layer shape change, which has been difficult in the past, can be tracked.
In addition, according to the compression molding analysis apparatus 10 of the present embodiment, it is possible to perform point tracking for various shapes of the intermediate layer shape by performing the analysis of the layer shape change only once.
For this reason, it becomes possible to perform more efficient forming analysis as compared with the forming analysis method based only on the conventional adaptive mesh method.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a block diagram showing the configuration of the compression molding analysis apparatus of the present embodiment. FIG. 6 is a diagram showing a state of point tracking in the global point tracking method of the present embodiment. FIG. 7 is a diagram showing how the intermediate layer distribution on the initial shape is calculated in the global point tracking method of the present embodiment.

  This embodiment is a further development of the point tracking method in the first embodiment. In analyzing the shape change of the entire layer, point tracking is executed while retaining the initial coordinate values of all nodes. In addition, the present invention relates to a global point tracking method capable of calculating the intermediate layer distribution in the initial shape such that the distribution of the intermediate layer after molding is optimal by obtaining the initial coordinate value distribution in the final shape.

  As shown in FIG. 5, the compression molding analysis apparatus 10 of the present embodiment has a global point tracking unit 10 h, a global point tracking result storage unit 10 i, a post-molding intermediate layer shape, in addition to the configuration in the first embodiment. An information input unit 10j, an initial intermediate layer shape information generation unit 10k, and an initial intermediate layer shape information storage unit 10l are provided.

The global point tracking unit 10h executes a global point tracking process, and is configured on a CPU and a memory in the compression molding analysis apparatus 10 by executing predetermined fluid analysis software.
As this fluid analysis software, for example, “POLYFLOW” sold by FLUENT can be used as in the layer shape change analysis unit 10c.

The global point tracking unit 10h reads the analysis result from the analysis result storage unit 10d at every predetermined time step, and stores the initial coordinate values of all the nodes in the global point tracking result storage unit 10i for each time step and node. Remember.
As the initial coordinate values of the nodes, the same initial coordinate values as before the movement can be used in the time step when the adaptive mesh method is not used in the deformation. On the other hand, in a time step in which the adaptive mesh method is used, initial coordinate values of nodes newly set by remeshing are calculated by interpolation calculation. Therefore, after the initial coordinate value is stored once in the global point tracking result storage unit 10i, the initial coordinate value can be used as it is or can be updated and used.

The global point tracking unit 10h causes the point tracking unit 10f to perform point tracking for each predetermined time step for all nodes in the initial shape of the entire layer, and the tracking result is stored in the global point tracking result storage unit. 10i is stored. This tracking result includes, for each time step, physical information such as coordinate information after moving all the points to be tracked and a velocity vector.
It should be noted that with respect to a point (a point that is not a node) in a portion where coordinate information and a physical quantity are not stored in the analysis result of the layer shape change, a velocity vector can be calculated and point tracking can be performed by performing interpolation calculation. The interpolation calculation method can be the same method as described above in step 35 of the processing procedure of the first embodiment.

Then, the global point tracking unit 10h generates an initial coordinate value distribution of the tracked points every predetermined time step.
At this time, if all of the tracking points coincide with the nodes, the initial coordinate value distribution of the nodes is generated as it is as the initial coordinate value distribution of the tracking points. If some or all of the tracking points do not match the nodes, the initial coordinate value of each tracking point is calculated by interpolation calculation based on the initial coordinate values of the nodes around each tracking point. Thus, an initial coordinate value distribution is generated.
Thereby, the global point tracking unit 10h generates the initial coordinate value distribution in the final shape of the entire layer by repeating the above processing until the analysis end time, and stores this in the global point tracking result storage unit 10i. Can do.

  FIG. 6 is a diagram showing a state of point tracking in such a global point tracking method. According to the global point tracking method by the compression molding analysis apparatus 10 of the present embodiment, as shown in FIG. By tracking the points (c) and storing the initial coordinate values of each point in the global point tracking result storage unit 10i, it is possible to obtain the initial coordinate value distribution of the tracking points after molding. Become.

The global point tracking result storage unit 10i stores the initial coordinate value of each tracking point and the tracking result calculated by the point tracking unit 10f.
The tracking results include the coordinate information of all points tracked from the nodes of the initial shape of the entire layer and the velocity vector at each point in the process of forming the entire layer from the initial shape to the final shape. Includes physical quantities.

The post-molding intermediate layer shape information input unit 10j inputs post-molding intermediate layer shape information constituted by coordinate information of points on an arbitrary region determined on the final shape of the entire layer to the compression molding analysis apparatus 10, For use in the initial intermediate layer shape information generation unit 10k, the compression molding analysis apparatus 10 stores the information. The final shape of the entire layer means the final shape information of the entire layer stored in the analysis result storage unit 10d by analyzing the layer shape change.
By determining the ideal intermediate layer shape desired to be obtained by compression molding as an arbitrary region, the initial intermediate layer shape information generation unit 10k is necessary to form the ideal intermediate layer. It is possible to calculate the shape of the intermediate layer in the initial shape of the entire layer.

  As the points on the arbitrary region, those on the outline and inside of the arbitrary region that can discriminate the arbitrary region are specified. As the specifying method, for example, it is possible to specify all the nodes included in the region. Also, a method of identifying points obtained by dividing the entire circumference of the region into n may be used. Note that this specification can be performed manually as well as automatically by a computer.

The initial intermediate layer shape information generation unit 10k generates an initial intermediate layer in the initial shape of the entire layer corresponding to the arbitrary region based on the initial coordinate value of the point on the arbitrary region determined on the final shape of the entire layer. Layer shape information is generated.
FIG. 7 is a diagram illustrating a state in which the initial intermediate layer distribution is drawn on the initial shape of the entire layer by the initial intermediate layer shape information generation unit 10k.
As shown in the figure, the ideal shape of the intermediate layer is determined on the final shape of the entire layer, the point corresponding to this shape is identified, the initial coordinate value of the identified point is obtained, and this initial value is obtained. By arranging the coordinate value points so as to overlap the initial shape information of the entire layer, it is possible to generate initial intermediate layer shape information constituting an ideal intermediate layer after molding.

  The initial intermediate layer shape information storage unit 101 stores the initial intermediate layer shape information generated by the initial intermediate layer shape information generation unit 10k. The initial intermediate layer shape information includes shape information indicating the initial shape of the entire layer, and coordinate information (initial coordinate values) of points indicating the ideal intermediate layer in the initial shape.

  Next, a processing procedure in the compression molding analysis apparatus 10 of the present embodiment will be described with reference to FIGS. FIG. 8 is a flowchart showing a global point tracking process executed by the compression molding analysis apparatus of the present embodiment, and FIG. 9 is a flowchart showing an initial intermediate layer distribution generation process executed by the apparatus.

First, when executing the global point tracking process of the present embodiment, the layer shape change analysis process described above with reference to FIG. 3 is first executed. Then, the global point tracking process shown in FIG. 8 is executed.
As shown in FIG. 8, the global point tracking unit 10h in the compression molding analysis apparatus 10 reads the analysis result of the layer shape change from the analysis result storage unit 10d (step 50).
Next, the global point tracking unit 10h stores the initial coordinate values of all nodes in the read analysis result in the global point tracking result storage unit 10i (step 51).

At this time, the global point tracking unit 10h repeatedly executes these processes for each time step.
That is, in the first process, the global point tracking unit 10h reads the coordinate values of all the nodes in the initial shape of the entire layer, and the physical quantities at the respective nodes.
In the second and subsequent processes, the global point tracking unit 10h reads the coordinate information of all the nodes in the next time step shape and the physical quantities at the respective nodes.

Further, in the first processing, the global point tracking unit 10h stores the coordinate information of each node in the initial shape of the entire layer in the global point tracking result storage unit 10i as an initial coordinate value.
In the second and subsequent processes, the global point tracking unit 10h includes the coordinate information of the tracking point of the next time step calculated in the previous process (described later in Step 52-4), and the analysis result storage unit 10d. Compare the coordinate information of all nodes in the shape of the whole layer of the next time step read from.

If these nodes coincide, the initial coordinate value distribution stored last time is stored in the global point tracking result storage unit 10i as the initial coordinate value distribution of the nodes in the shape of the entire layer at the next time step as it is. Let
Also, if these nodes do not match, that is, in the time step when remeshing is performed in the analysis of the layer shape change, the entire layer of the next time step is calculated based on the previously stored initial coordinate value distribution by interpolation calculation. An initial coordinate value distribution of nodes in the shape of is generated.
The interpolation calculation method of the initial coordinate value distribution can be the same method as described above in the description of step 35.

Next, the global point tracking unit 10h causes the point tracking unit 10f to execute the same processing as the point tracking in the first embodiment (step 52).
First, the point tracking unit 10f determines a tracking point (step 52-1). In the case of the present embodiment, this tracking point can be all nodes read in step 50 in the first processing (processing in the first time step). In the second and subsequent processes (processes after the second time step), the point after the last tracked point is moved.
And the point tracking part 10f acquires the coordinate information of a tracking point (step 52-2). As this coordinate information, the coordinate information of the node read in step 50 can be used in the first processing. In the second and subsequent processing, the coordinate information of the point after the movement of the point tracked last time can be used.

Next, the point tracking unit 10f calculates a velocity vector at the tracking point (step 52-3). As the velocity vector, a vector included in the physical quantity of the node read in step 50 can be used in the first processing. In the second and subsequent processing, when the tracking point matches one of the nodes included in the analysis result, the velocity vector held in the analysis result is used as it is as the physical quantity of the matching node. be able to. Further, when the tracking point does not coincide with the node, it is calculated by interpolation calculation from the velocity vectors of the nodes around the tracking point.
As the interpolation calculation method, the same method as described above in the description of step 35 can be used.

Next, the point tracking unit 10f calculates the coordinates of the position at the next time step from the coordinate information of the tracking point and the velocity vector, and passes the coordinates to the global point tracking unit 10h. The global point tracking unit 10h The coordinate information is stored in the global point tracking result storage unit 10i for each time step (step 52-4).
And the process of step 52-2-step 52-4 is repeated about all the tracking points (No of step 52-5).

  When calculation of the coordinates of the position in the next time step and storage of the coordinate information in the global point tracking result storage unit 10i for all the tracking points is completed (Yes in step 52-5), the global point tracking unit 10h generates an initial coordinate value distribution of these tracking points for each time step (step 53).

At this time, if each tracking point matches the node in the analysis result read in step 50, the initial coordinate value distribution of the tracking point is generated using the initial coordinate value of each node stored in step 51 as it is. If each tracking point does not coincide with the node in the analysis result read in step 50, the initial coordinate value of each tracking point is calculated by interpolation based on the initial coordinate value of each node stored in step 51. The initial coordinate value distribution of the tracking points is generated using the calculated initial coordinate values.
Note that the initial coordinate value distribution means coordinate information of each tracking point and information including each initial coordinate value.

Next, the global point tracking unit 10h determines whether or not the analysis end time has come (step 54).
If the analysis end time has not been reached (No in step 54), the processing from step 50 to step 53 is repeated in the next time step. If the analysis end time has been reached (Yes in step 54), global tracking is performed. End point processing.

Next, the initial intermediate layer distribution generation process will be described with reference to FIG.
First, prior to the initial intermediate layer distribution generation process, an arbitrary region (hereinafter sometimes referred to as a final intermediate layer region) is determined on the final shape of the entire layer stored in the analysis result storage unit 10d. (Step 70). The final shape of the entire layer can be grasped from the shape information of the final shape of the entire layer stored in the analysis result storage unit 10d.
As the final intermediate layer region, it is preferable to determine a desired ideal intermediate layer region after molding. Then, the intermediate layer distribution in the initial shape necessary for obtaining the ideal intermediate layer after molding can be calculated by the initial intermediate layer distribution generation process. This final intermediate layer region is determined by a person.

Next, the post-molding intermediate layer shape information input unit 10j in the compression molding analysis apparatus 10 inputs the coordinate information of the points specified to such an extent that the region can be discriminated on the final intermediate layer region (step 71). ).
Then, the initial intermediate layer shape information generation unit 10k in the compression molding analysis apparatus 10 calculates the initial coordinate values of the points on the final intermediate layer region based on the information stored in the global point tracking result storage unit 10i (step 72). ).

At this time, when the coordinate information of the point on the final intermediate layer area is stored in the global point tracking result storage unit 10i, the initial intermediate layer shape information generation unit 10k By reading the initial coordinate values corresponding to the global point tracking result storage unit 10i, the initial coordinate values can be acquired.
When the coordinate information of the point on the final intermediate layer area is not stored in the global point tracking result storage unit 10i, the initial intermediate layer shape information generation unit 10k selects the point on the final intermediate layer area. By reading the initial coordinate values corresponding to the points stored in the global point tracking result storage unit 10i as the surrounding points from the global point tracking result storage unit 10i and performing the interpolation calculation as described above, An initial coordinate value of a point on the final intermediate layer region can be calculated.

Next, the initial intermediate layer shape information generation unit 10k reads the initial shape information of the entire layer from the analysis result storage unit 10d, and superimposes the initial coordinate value points of the points corresponding to the final intermediate layer region on this initial shape information. (Step 73). Thereby, the initial shape information of the intermediate layer corresponding to the final intermediate layer region can be generated.
Then, the initial intermediate layer shape information generation unit 10k stores the obtained initial intermediate layer shape information in the initial intermediate layer shape information storage unit 10l (step 74).

As described above, according to the compression molding analysis apparatus of the present embodiment, it is possible to generate the initial shape information of the intermediate layer in the initial shape of the entire layer corresponding to the intermediate layer of any shape after molding, An intermediate layer distribution can be calculated.
For this reason, even with a small amount of the intermediate layer, it is possible to obtain an ideal intermediate layer distribution in the initial shape of the entire layer, which can obtain an optimal intermediate layer after molding.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. This figure is a flowchart showing a layer shape change analysis process taking into account the difference in physical properties executed by the compression molding analysis apparatus of the present embodiment.
This embodiment is a further development of the point tracking method in the first embodiment.In analyzing the shape change of the entire layer composed of a plurality of materials, the shape change is considered in consideration of the difference in physical properties for each material. Analyze. About another point, it is the same as that of 1st embodiment.

First, a model file is created as analysis target data in the layer shape change analysis process (step 90).
This model file holds information on the mold shape and the initial resin region shape as in the first embodiment.
Then, the created model file is stored in the model file storage unit 10a in the compression molding analysis apparatus 10 (step 91).

Next, for each material constituting the layer, a region in which the material is arranged is determined (step 92). This corresponds to determining the initial shape of the intermediate layer.
Then, a virtual scalar quantity is set for each area (step 93). Specifically, different scalar amounts (for example, 1 for the intermediate layer, 2 for the outer layer, etc.) are assigned to nodes included in a certain region and nodes that are not.
This scalar amount is stored in the analysis result storage unit 10d in association with the node for each time step in the entire process from the initial shape to the final shape of the entire layer.
Accordingly, it is possible to obtain a scalar amount distribution for each time step based on the scalar amount of each node for each time step stored in the analysis result storage unit 10d.

Next, the virtual scalar quantity and physical properties are associated (step 94). For example, regarding the viscosity as a physical quantity, the portion of the scalar amount 1 is related to the viscosity of 3000, and the portion of the scalar amount 2 is related to the viscosity of 6000.
Further, other analysis conditions, such as physical properties of the mold and resin, molding speed, time step of analysis, etc. are set (step 95).
Then, the analysis condition input unit 10b in the compression molding analysis apparatus 10 inputs and stores the analysis conditions set in steps 92 to 95 in the compression molding analysis apparatus 10 and makes them usable by the layer shape change analysis unit 10c. (Step 96).

Next, as in the first embodiment, the layer shape change analysis unit 10c uses the model file stored in the model file storage unit 10a to create a layer based on the analysis conditions input by the analysis condition input unit 10b. A shape change analysis process is executed (step 97).
Then, the layer shape change analysis unit 10c stores the analysis result in the analysis result storage unit 10d (step 98).

  As described above, according to the compression molding analysis apparatus of the present embodiment, the layer shape change can be analyzed in consideration of the difference in physical properties, and the point tracking can be performed.

It goes without saying that the present invention is not limited to the above embodiment, and that various modifications can be made within the scope of the present invention.
For example, although the compression molding analysis has been described in the above embodiment, the present invention can be applied to the injection molding analysis.
Moreover, although the said embodiment demonstrated the case where the shape change of a layer was simulated in two dimensions, it is possible to apply the same method to three dimensions.

Furthermore, in the above embodiment, the layer shape change analysis unit 10c first analyzes the shape change of the entire layer from the initial shape to the final shape, and then performs point tracking or global point tracking. It is also possible to perform sequential layer shape change analysis and point tracking or global point tracking at each time step of analysis in the process from forming to final shape.
In addition, the second embodiment and the third embodiment can be combined and changed appropriately so as to perform global point tracking in consideration of the difference in physical properties of the material constituting the layer.

  INDUSTRIAL APPLICABILITY The present invention can be used for predicting an initial layer configuration so as to obtain a desired layer arrangement after molding when molding a packaging container or the like. In particular, it can be suitably used for molding analysis of multi-layered resins with large deformation.

It is a block diagram which shows the structure of the compression molding analyzer of 1st embodiment of this invention. It is a figure which shows the mode of the point tracking in the point tracking method of 1st embodiment of this invention. It is a flowchart which shows the analysis process of the layer shape change performed by the compression molding analyzer of 1st embodiment of this invention. It is a flowchart which shows the point tracking process performed by the compression molding analyzer of 1st embodiment of this invention. It is a block diagram which shows the structure of the compression molding analyzer of 2nd embodiment of this invention. It is a figure which shows the mode of the point tracking in the global point tracking method of 2nd embodiment of this invention. It is a figure which shows a mode that the intermediate layer distribution on the initial shape is calculated in the global point tracking method of 2nd embodiment of this invention. It is a flowchart which shows the global point tracking process in the compression molding analyzer of 2nd embodiment of this invention. It is a flowchart which shows the initial stage intermediate layer distribution production | generation process in the compression molding analyzer of 2nd embodiment of this invention. It is a flowchart which shows the analysis process of the layer shape change in consideration of the difference in the physical property in the compression molding analyzer of 3rd embodiment of this invention. It is a figure which shows the mode (1) of the analysis of the layer shape change by the conventional adaptive mesh method. It is a figure which shows the mode (2) of the analysis of the layer shape change by the conventional adaptive mesh method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Compression molding analyzer 10a Model file memory | storage part 10b Analysis condition input part 10c Layer shape change analysis part 10d Analysis result memory | storage part 10e Intermediate | middle layer shape information input part 10f Point tracking part 10g Point tracking result memory | storage part 10h Global point tracking part 10i Global point tracking result storage unit 10j Post-molding intermediate layer shape information input unit 10k Initial intermediate layer shape information generation unit 10l Initial intermediate layer shape information storage unit

Claims (8)

A molding analysis method for causing a molding analysis device to calculate a layer distribution in the molding process,
The layer shape change analysis means in the forming analysis device analyzes the layer based on a predetermined analysis condition, and an analysis result comprising the coordinate information of the mesh node allocated to the layer and a physical quantity including the velocity vector of the node For each given time step,
The point tracking means in the molding analysis apparatus reads the analysis result at each predetermined time step, and based on the analysis result and the coordinate information of one or more arbitrary points assumed in the layer. The velocity vector at each point is calculated, the coordinate information of each point after the predetermined time step is calculated, the analysis result is read, the velocity vector is calculated, and the coordinate information is calculated for a predetermined time. It repeats until it passes, and calculates the coordinate information after the predetermined time of the arbitrary points assumed in the said layer. The shaping | molding analysis method characterized by the above-mentioned. The global point tracking means in the molding analysis apparatus reads the analysis result at each predetermined time step, and sets the coordinate information and initial coordinate values of all the nodes in the first time step in the analysis result as global points. The tracking result is stored in the tracking result storage unit, the node is tracked during the predetermined time step by the point tracking unit, the coordinate information of each node after the predetermined time step is calculated, and after the predetermined time step Generating an initial coordinate value distribution of each node and reading the analysis result, storing the coordinate information and initial coordinate value of each node after the predetermined time step based on the analysis result, the predetermined time step Further calculation of the coordinate information of each node after the predetermined time step by point tracking for each subsequent node, and the initial coordinate value of each node after the predetermined time step 2. The molding analysis according to claim 1, wherein generation of coordinates is repeated until a predetermined time elapses, and coordinate information and initial coordinate value distribution after a predetermined time of all nodes in the first time step in the analysis result are calculated. Technique. Arbitrary intermediate layer shape generating means in the molding analysis device is specified on the final shape of the entire layer composed of coordinate information after a predetermined time of all the nodes calculated by the global point tracking means Based on the coordinate information of a large number of points in the intermediate layer shape, initial coordinate values corresponding to the points are calculated based on the coordinate information and initial coordinate values stored in the global point tracking result storage means, and these initial values are calculated. The molding analysis method according to claim 2, wherein the initial shape information corresponding to the intermediate layer shape is generated by superimposing the coordinate value points on the initial shape information of the entire layer. The point tracking means comprises:
When the coordinate information of one or more arbitrary points assumed in the layer does not match the coordinate information of the nodes in the analysis result, the speed corresponding to the nodes around the arbitrary point in the analysis result The molding analysis method according to claim 1, wherein a velocity vector of the arbitrary point is calculated by interpolation calculation using a vector. A molding analysis device for calculating a layer distribution in a molding process,
Layer shape change analysis that analyzes a layer based on a predetermined analysis condition and calculates an analysis result consisting of the coordinate information of the nodes of the mesh assigned to the layer and a physical quantity including the velocity vector of the node for each predetermined time step Means,
For each predetermined time step, read the analysis result, calculate the velocity vector at each point based on the analysis result and the coordinate information of one or more arbitrary points assumed in the layer, Calculate the coordinate information of each point after the predetermined time step, and repeat the reading of the analysis result, the calculation of the velocity vector, and the calculation of the coordinate information until a predetermined time elapses, and assume in the layer And a point tracking means for calculating coordinate information of the given arbitrary point after a predetermined time. For each predetermined time step, the analysis result is read, and the coordinate information and initial coordinate values of all nodes in the first time step in the analysis result are stored in the global point tracking result storage means, and the node is The point tracking means performs point tracking during the predetermined time step, calculates coordinate information of each node after the predetermined time step, and generates initial coordinate value distribution of each node after the predetermined time step. And reading the analysis result, storing the coordinate information and initial coordinate value of each node after the predetermined time step based on the analysis result, and further tracking the point for each node after the predetermined time step. Repeat the calculation of the coordinate information of each node after the time step and the generation of the initial coordinate value distribution of each node after the predetermined time step until the predetermined time has passed. The first time all nodes of a predetermined time after the forming analysis apparatus according to claim 5, further comprising a global point tracking means for calculating the coordinate information and the initial coordinate value distribution step in the analysis results. Based on the coordinate information of a large number of points in any intermediate layer shape specified on the final shape of the entire layer composed of coordinate information after a predetermined time of all the nodes calculated by the global point tracking means The initial coordinate value corresponding to the point is calculated based on the coordinate information and the initial coordinate value stored in the global point tracking result storage means, and the point of these initial coordinate values is used as the initial shape information of the entire layer. The molding analysis apparatus according to claim 6, further comprising initial intermediate layer shape generation means for generating initial shape information corresponding to the intermediate layer shape in a superimposed manner. The point tracking means comprises:
When the coordinate information of one or more arbitrary points assumed in the layer does not match the coordinate information of the nodes in the analysis result, the speed corresponding to the nodes around the arbitrary point in the analysis result The molding analysis apparatus according to claim 5, wherein a velocity vector of the arbitrary point is calculated by interpolation calculation using a vector.

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