JPH1071642A - Analysis of flexible film member deforming process and apparatus thereof, analysis of blow type molding process and apparatus therefor and manufacture of blow type molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and efficiently form the shape of a mold by modeling at least a part of a cavity shape model by using the function describing the shape of the mold. SOLUTION: For example, when a 1×7 order B spline patch is used when a surface is defined, the surface can be defined by data called the so-called nodal point vector determining 2×8 control point data and weighing function. Herein, the number of control points is 2×8 consisting of a 8 points constituting a curve 10 and 8 points constituting a curve 11 and the nodal point vector determining the degree of the proximity of a curved surface 12 is set to data of a 1×5 size and a 1×10 size. Since the control point data is displayed by a system of coordinates data (x, y, z) within a three-dimensional space, the magnitude of data becomes real number data of the number of control points ×3. Therefore, the number of data necessary for defining a curved surface by CAD is real number data 63. Therefore, data input work is simplified to a large extent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to blow molding, thermoforming, and judging contact between a parison (resin) and a mold.
The present invention relates to a method and an apparatus for analyzing a blow-type molding process such as vacuum molding, and a method for manufacturing a blow-type molded product.

[0002]

2. Description of the Related Art In a simulation of a molding process of a blow mold such as a blow molding, an initial parison (resin) shape is modeled by a set of triangular or quadrilateral minute plane elements, and a numerical analysis method such as a finite element method is used. In general, a method of simulating the deformation behavior of a parison is performed. For example, in the simulation of the blow molding, the contact between the parison and the mold due to the deformation of the parison is usually determined in the simulation of the mold clamping step and the air blowing step which are the molding steps of the blow molding. Conventionally, for this determination, the shape of the mold cavity engraved inside the mold was modeled as an aggregate of minute plane elements like a parison,
Contact determination was performed using the positional relationship between each of the plane elements and the nodes constituting the elements of the parison model.

[0003] In the case of blow molding, the mold cavity shape is
It is a so-called molded product shape, and when creating a model, an operator often converts the product design data into a finite element model composed of a plurality of minute plane elements.

[0004] Similarly to the above, an operator creates a model composed of minute plane elements by an operator for an interfering object such as a human body in the case of simulating a deformation state of a flexible film body such as clothes when clothes are put on the human body. It was done.

[0005] Here, the flexible film means a flexible structure such as cloth, sheet or film containing parison, which has a thin structure with respect to the surface and is easily deformed.

[0006]

However, in most cases, the design of products is performed using a CAD system, and the work of recreating a finite element model consisting of a plurality of small element planes from CAD data for simulation is highly advanced. It required a lot of modeling techniques and was a very time-consuming task. In addition, since this conversion approximates a plurality of planes when expressing a surface, an extremely large number of plane elements are required to accurately express a free-form surface.

The same applies to the case of the human body.

An object of the present invention is to provide a method and an apparatus for analyzing a blow-type molding process which can easily and efficiently create a shape model of a molding die such as a mold and have a high working efficiency.

Another object of the present invention is to provide a method and an apparatus for analyzing a blow-type molding process capable of creating a shape model of a molding die by effectively utilizing CAD data used for product design.

Another object of the present invention is to provide a method for determining a molding condition and the like of a blow-type molded product by using the above-described analysis method and efficiently producing a blow-type molded product with high accuracy. It is in.

Another object of the present invention is to provide a method and an apparatus for analyzing a deformation process of a flexible membrane which can easily and efficiently create a shape model of an interference object such as a human body and have a high working efficiency.

It is another object of the present invention to provide a method and an apparatus for analyzing a deformation process of a flexible membrane which can create a shape model of an interfering object by effectively utilizing CAD data used for product design. is there.

Another object of the present invention is to determine the molding conditions and the like of a flexible membrane product using the above-described analysis method,
An object of the present invention is to provide a method for efficiently producing a flexible flexible film product with high accuracy.

[0014]

According to the method for analyzing a blow-type molding process of the present invention, a cavity shape model is created based on the shape of a mold to which a parison is pressed while being deformed, and a plurality of models are created based on the initial shape of the parison. Analysis of blow-type molding process for creating a parison shape model composed of micro-elements, and obtaining a contact state between the molding die and the parison based on relative motion between each micro-element of the parison shape model and the cavity shape model The method
At least a part of the cavity shape model is modeled by a function describing a shape of the mold.

In a preferred aspect of the present invention, the function is such that the position of a plurality of points representing a curved surface that matches or approximates at least a part of the shape of the mold and / or the geometrical shape of the curved surface It is characterized by being obtained based on parameters.

In a preferred aspect of the present invention, the function is obtained based on CAD data of the molding die.

The apparatus for analyzing a blow type molding process according to the present invention comprises: cavity shape model data input means for receiving data input of a cavity shape model based on the shape of a molding die to which the parison is pressed while being deformed; Parison shape model data input means for receiving data input of a parison shape model composed of a plurality of microelements based on the following, and input of each of the parison shape model minute element and the cavity shape model data input by the parison shape model data input means Relative motion calculating means for calculating relative motion of the cavity shape model input by the means, and contact state calculating means for calculating a temporal change in the contact state between the molding die and the parison based on the obtained relative motion. Analysis of equipped blow type molding process Wherein the cavity shape model data input means inputs the positions of a plurality of points representing a curved surface that matches or approximates at least a part of the shape of a mold and / or the input of geometric parameters of the curved surface. And the contact state calculation means,
The state of contact between the functions obtained based on the positions and / or geometric parameters of the plurality of points received by the cavity shape model data input means and the geometrical positional relationship between each of the microelements of the parison shape model Is calculated.

In a preferred aspect of the present invention, the cavity shape model data input means receives CAD data of a molding die.

Further, in the method of manufacturing a blow-type molded product according to the present invention, a cavity shape model is created based on the shape of a mold to which a parison is pressed while being deformed, and a plurality of microelements are formed based on the initial shape of the parison. A parison shape model is created, and a contact state between the molding die and the parison is obtained based on a relative movement between each micro element of the parison shape model and the cavity shape model, and information on the obtained contact state is obtained. Determining the shape and / or molding conditions of the molding die based on the shape and / or the molding conditions. Is characterized in that at least a part of is modeled by a function that describes the shape of the mold.

In a preferred aspect of the present invention, the blow mold is formed by blow molding, thermoforming or vacuum forming.

In the method of analyzing the deformation process of a flexible film according to the present invention, an interference shape model is created based on the shape of an interference object pressed while the flexible film is deformed, and a plurality of models are created based on the initial shape of the flexible film. A flexible film body shape model composed of minute elements is created, and a contact state between the interference object and the flexible film body is obtained based on a relative motion between each minute element of the flexible film body shape model and the interference shape model. An analysis method of a deformation process of a flexible membrane, wherein at least a part of the interference shape model is modeled by a function describing a shape of the interference object.

The apparatus for analyzing the deformation process of a flexible film body according to the present invention comprises: an interference shape model data input means for receiving data of an interference shape model based on the shape of an interference object pressed while deforming the flexible film body; Flexible membrane shape model input means for receiving data input of a flexible membrane shape model composed of a plurality of microelements based on the initial shape of the membrane, and a flexible membrane shape input by the flexible membrane shape model data input means Relative motion calculating means for calculating the relative motion of the interference shape model input by each minute element of the model and the interference shape model data input means; and the interference object and the flexible film body based on the obtained relative motion. An analyzer for analyzing a deformation process of a flexible film body, comprising: a contact state calculating means for determining a temporal change in a contact state with the flexible film body.
The interference shape model data input means receives an input of positions of a plurality of points representing a curved surface that matches or approximates at least a part of the shape of the interfering object and / or geometric parameters of the curved surface. The contact state calculating means includes a function obtained based on the positions and / or geometric parameters of the plurality of points received by the interference shape model data input means and a geometrical relationship between each of the small elements of the flexible membrane shape model. It is characterized in that the contact state between the two is calculated based on the target positional relationship.

In the method for manufacturing a flexible film product according to the present invention, an interference shape model is created based on the shape of an interference object to which the flexible film is pressed while being deformed, and a plurality of models are created based on the initial shape of the flexible film. A flexible film shape model composed of minute elements is created, and a contact state between the molding die and the flexible film body is determined based on a relative motion between each minute element of the flexible film shape model and the interference shape model. Determining the shape of the flexible film body based on the information of the obtained contact state, a method of manufacturing a flexible film body to manufacture a flexible film product based on the shape, at least the interference shape model A part is modeled by a function that describes the shape of the interference object.

Further, according to the storage medium of the present invention, there is provided a storage medium in which software for operating a computer is recorded so that each procedure of the above-described method of analyzing a blow type molding process can be performed by the computer.

According to the storage medium of the present invention, there is provided a storage medium in which software for operating a computer is recorded so that each procedure of the above-mentioned method of analyzing a deformation process of a flexible film body can be performed by the computer. .

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, first, the shape of the parison extruded from the molding machine is modeled as an aggregate of a plurality of small elements as shown in FIG. 1, for example.

Here, a set of data of the coordinates of the nodes forming the element and a set of element data including the numbers of the nodes forming each element are created as data files, and this file is used as initial parison shape data. .

Also, based on the CAD data used for designing the product to be molded, the shape of the cavity engraved inside the molding die is
Prepare with CAD surface data as shown in FIG.

After preparing the above-mentioned shape data, these data are inputted to a computer, and based on the input, a computer executes a simulation from a mold clamping by a blow molding die to an air blowing process.

More specifically, the parison finds an external force received in the molding process of blow molding and an internal force generated from a strain generated by deformation, and, based on the force, formulas a motion equation that is established at the following time t. Lead.

[0032]

(Equation 1) From the equation (1), the acceleration of each node of the parison at the time t is obtained. Since the acceleration a obtained at this time is the second derivative (d ² u / dt ² ) of the displacement u with respect to the time t, the displacement Δu after a minute time Δt seconds can be obtained by integrating the acceleration a with time. it can. The central difference method is preferable for the time integration method used here.

The deformation of the parison can be obtained from the displacements of all the nodes constituting the parison model after Δt seconds obtained by the above method. By repeating this operation, the deformation of the parison in blow molding is simulated.

In this calculation, the contact between the parison and the mold accompanying the movement of the mold in the mold clamping step, and the contact between the parison and the mold due to the expansion of the parison in the air blowing step are defined by the nodes of the parison finite element model and the CAD. Judgment is made from the geometric positional relationship with the surface definition of the type by the data.

The details will be described below.

FIG. 3 is a diagram showing a hardware configuration of the present invention. A CAD device 105, an input device 103, a display device 104, and an auxiliary storage device 102 are connected to the computer 101. The CAD device 105 creates a three-dimensional CAD model representing the shape of the product. The input device 103 receives, for example, the input of molding condition and parison model data of the blow molded product to be analyzed, and stores such data in the auxiliary storage device 102. The computer 101 stores this data in an internal RAM (volatile memory that can be randomly accessed) in accordance with an instruction from the operator.
And analyze it. The obtained analysis result is displayed on the display device 104, for example. If necessary, the operator can change the blow molding conditions and perform the analysis again. The output of the analysis result may be sent to the printer device or may be stored in the auxiliary storage device 102.
In this case, for example, this output can be used as input data of another analysis device.

FIG. 4 is a flowchart showing a schematic procedure of the embodiment of the present invention. As a procedure, first, a parison finite element model is created (step 1), which is input to a computer (step 2), and CAD data used for design as a mold cavity shape is input to a computer (step 3). At the same time, input the molding conditions and analysis conditions (step 4). Based on the data, a simulation of a mold clamping process of blow molding is performed (step 5), and then a simulation of an air blowing process is performed (step 6).

FIG. 5 shows a configuration of an analysis part of the simulation apparatus of the present invention. The present invention reads the shape CAD data (molding mold data) and parison shape data of a target product and converts the data for analysis. A data input unit 1 to be created, a molding die-clamping process analyzing unit 2 for simulating a mold-clamping process by a blow-molding die based on the input data given here, and an air blowing process after the mold clamping is completed. An air blowing process analyzing unit 3 for performing a simulation and a contact determining unit 4 for determining a contact between a parison and a mold when performing the analysis are provided.

The resin molding simulation operation of the above configuration will be described below.

The data input unit 1 is provided with CAD data (molding mold data) for molding a target product prepared in advance.
This is a part for reading the geometrical shape data from the parison data and preparing the resin molding analysis data from the molding conditions input separately.

The mold-clamping-process analyzing section 2 simulates a mold-clamping process in blow molding. Here, the deformation of the parison 2 due to the movement of the molding die 3 located outside the parison 2 extruded from the die 1 as shown in FIG. 6 to the mold clamping completion position is calculated.

FIG. 7 is a flow chart showing a procedure of analysis in the mold clamping step analyzing section 2. In the analysis of the mold clamping process, first, the analysis data created by the data input unit 1 is read (step 1). Next, FIG.
The state where the mold 3 is opened with the parison 2 therebetween is set as shown in (2). Subsequently, the mold is moved by a minute distance ΔL in the mold clamping direction (step 3). The contact between the parison and the mold due to the movement of the mold at this time is determined (step 4). Then, the deformation of the parison during the movement of ΔL is calculated (step 5). The mold is closed by the movement of ΔL, and it is checked whether mold clamping is completed (step 6). At this time, if the mold clamping is not completed, the process returns to step 3 and the calculation is repeated. After this operation is repeated until the mold clamping is finally completed, the mold clamping process analysis ends when the mold is completely closed.

The air blowing process analyzing unit 3 is a part for simulating the expansion of the parison due to the air blowing and the contact with the mold accompanying the expansion. FIG. 8 schematically shows a molding process by air blowing from completion of mold clamping. Here, a state in which the parison 4 is pressed against the mold 5 by the blown air 6 is shown. .

FIG. 9 is a flowchart showing the procedure of analysis in the air blowing process analyzing section. In the analysis of the air blowing step, first, analysis data created by the data input unit 1 is read (step 1). Next, the parison deformation data due to the mold clamping obtained by the simulation performed by the mold clamping process analyzing unit 2 is read (step 2). Subsequently, the expansion of the parison inside the mold due to the rise in the internal pressure of the parison when air is blown is determined (step 3). Then, the contact between the parison and the mold in step 3 is determined, and if the contact is recognized, the contact portion of the parison is restrained by the mold surface (step 4). Here, it is determined whether all the nodes of the parison have completed contact with the mold, and if not completed, the process returns to step 3 and the calculation is repeated (step 5). When all the nodes of the parison have come into contact with the mold, the analysis of the air blowing process is completed.

The contact judging section 4 is a section for judging the contact between the parison and the mold in the analyzing sections 2 and 3. Here, CAD data is used as a method for expressing the mold shape.

The expression of a curved surface shape in CAD data is as follows:
In many cases, the form shown in equation (2) is used.

[0047]

(Equation 2) Here, x, y, and z represent coordinate values of an arbitrary point on the curved surface in three-dimensional orthogonal coordinates, and u and v are two-dimensional coordinate values representing positions in the curved surface. A function representing the curved surface P by summing the above equations is written as equation (3).

[0048]

(Equation 3) The curved surface P is an image in a designer's head or an ideal curved surface. To express this in the calculator,
A surface Q called a surface patch that matches or approximates the surface P is created in the computer.

[0049]

(Equation 4) The function representing the curved surface Q actually designates a point or a geometric parameter representing the curved surface P, and is constructed based on this. Here, a point representing a curved surface is a point included in the curved surface, a point to be approximated, a position useful for specifying the curved surface (for example, a center point of a spherical surface when a part of the curved surface can be approximated by a spherical surface, (Focus on spheroid, etc.)
Point to.

The definition of the curved surface Q is, for example, an interpolation method for designating points on the curved surface P to create a curved surface Q including these points, or a point sequence including a large number of points to be brought close to the curved surface P. And
It is often performed by an approximation method or the like that creates Q that expresses the shape of these point sequences in the closest form. The interpolation method is a method of creating a curved surface only from the data of the four corners of the patch. A bicubic patch of Coons, which creates a curved surface not only from the four corners of the patch, but also the data of the surrounding shape and slope, and information on the surroundings. In addition, there is a Forrest patch that creates a patch using information inside the surface (such as the coordinates of points included in the surface). As an approximation method, a Bezier patch or a B-spline patch that approximately defines a curved surface using a weight function is known. Among them, B spline patches are many CA
Since it is used in D, it will be described below.

The curved surface P should be close to the three-dimensional space (m +
1) It is assumed that a point sequence Vij arranged in a grid of (n + 1) is given by an operator. The next patch created based on these points (called control points) is called an m × n-order B-spline patch. Also,

(Equation 5) Approximate by

Here, the matrix B is obtained by arranging (m + 1) × (n + 1) control points V _ij as follows.

[0053]

(Equation 6) M and N are weight functions. The method of expressing these curved surfaces is disclosed in detail in documents such as "Introduction to CAD / CAM" edited by Fujio Yamaguchi (Industrial Research Council, 1983).

For example, when defining a surface as shown in FIG.
If a 1 × 7 B-spline patch is used, it can be defined by 2 × 8 control point data and data for determining a weighting function (called a node vector). Here, the control points are 2 × 8 points forming the curve 10 and the points 8 forming the curve 11 in FIG.
There are eight control points, and the nodal point vectors that determine the degree of approximation of the curved surface 12 are data of 1 × 5 and 1 × 10 size.
The control point data is coordinate data (x, y,
Since the data is displayed in the format of z), the size of the data is real number data of the number of control points × 3. Therefore, the number of data required to define a curved surface in CAD is the real number data 63. On the other hand, as shown in FIG.
If the same curved surface is represented by the set of
In this case, the number of nodes is 441 and the number of elements is 400. In this case, the minimum number of data necessary for defining the shape is the real number data 1 indicating the coordinates of the nodes.
There are 323 pieces and 1600 pieces of integer data representing the element configuration. Defining a mold with an aggregate of minute elements in this way requires an extremely large memory area as compared with the method using a function, and also requires a great deal of labor for building a model.

Moreover, as surface data used for contact determination,
If CAD data is used, a large amount of input data can be saved, and a curved surface close to the actual one can be expressed with even less data, so that accurate contact determination can be performed. As a method of judging the contact between the parison and the mold, a node of an element constituting the parison as shown in FIG. 1 is determined whether the node is inside or outside a curved surface defined by CAD in the parison deformation process. It is preferable to determine the parison based on the coordinates and the equation (5), and determine that the parison contacts the mold when the node comes out from the inside of the mold due to the deformation of the parison.

Next, a simulation method according to the above method will be described. A description will be given of a blow molding simulation of a rectangular container as an example of a target product. CAD data for defining a mold cavity shape as shown in FIG. 2 for blow molding a rectangular container, initial parison shape finite element data as shown in FIG. 1, and molding conditions are read into the data input unit 1,
With these, resin molding analysis data is created. Here, the initial parison has a cylindrical shape with a uniform thickness.

Based on this, a parison deformation due to the mold clamping is simulated by the mold clamping process analyzing unit 2, and as shown in FIG. 12, the upper and lower ends of the cylindrical parison are moved by the movement of the mold. This part is fixed to the mold and moves together, and the parison becomes a bag-like shape with the mold closed.

Further, the result is transferred as initial data of the air blowing process analyzing section, and as shown in FIG. 13, the bag-shaped parison expands due to the rise of the internal pressure due to the air blowing, and the inner wall surface of the mold defined by the CAD data. , And deforms into the shape of the cavity engraved in the mold.

Based on the above analysis results, a detailed shape such as an air vent hole of the molding die is determined, and a molding die is produced based on the result to produce a blow-type molded product.
Since the molding result can be predicted with high accuracy in advance, the number of trial production of the molding die can be greatly reduced. In addition, it is easy to develop and manufacture a molded article with few defects in a short time. In addition, other molding conditions such as molding temperature and material can be easily determined.

Furthermore, in the above example, the example in which the present invention is applied to blow molding in which a blow pressure is applied to the inside of a parison including a mold clamping step using a mold has been described. Close the end of the mold and pre-blow it to inflate it to close the mold in a stable shape (blow molding with pre-blow), or vacuum molding or thermoforming in which the pressure inside the parison is reduced and the parison is pressed into the mold And the like can also be applied to blow-type molding.

Further, in the above example, the example in which the present invention is applied to blow-type molding has been described. However, a similar method is adopted in which a flexible film body (including a parison in a blow-type molded product) such as cloth or clothing is formed on a table or a table. The present invention can also be applied to a case in which an object such as a mannequin or a human body is deformed upon contact with an interference object (including a mold in blow-type molding). In this case, if the parison in the blow type molding is replaced with cloth or clothing, the mold cavity is replaced with a table and a mannequin, and as an external force, analysis is performed using gravity instead of the pressure used in the blow type molding. Good. In the analysis of the flexible membrane, it has been general to use a set of minute elements for the shape model of the table and the mannequin. However, the CAD data can be directly used by using the method of the present invention. . As a result, the deformation state of the cloth or the clothes is confirmed by the simulation, and the design of the cloth or the clothes can be corrected based on the result. FIG. 14 shows the CAD data of the mannequin and FIG. 15 shows the result of the simulation of the clothing simulation.

Further, in the above example, the entire mold and the interference object are modeled based on the function. However, only a part may be modeled by the function, and the remaining part may be modeled based on the minute element. .

As described above, the present invention utilizes a simulation using a computer, and software for performing such a simulation is often
It is distributed by a storage medium such as a magnetic disk or an optical disk or by a wired or wireless transmission means such as a network.

[0064]

As described above, according to the present invention, when analyzing the deformation process of a flexible film body typified by the blow molding process, the interference of an interference object such as a mold or a human body is analyzed. Since a model using a function is used as a method for defining the surface, a molding die or an interference object can be modeled accurately with a small amount of data. Further, according to a preferred aspect of the present invention, since the function is constructed based on CAD data, the data input operation can be greatly simplified, and the CAD data used for product design can be used to create a model. Work can be largely omitted.

Further, according to the method of manufacturing a flexible film product represented by the blow-type product of the present invention, the flexible film product is manufactured based on the highly accurate results efficiently analyzed by the above method. Quality and production efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an initial parison shape model.

FIG. 2 is a diagram showing an example of a mold cavity model of a rectangular container whose shape is defined by CAD.

FIG. 3 is a diagram illustrating a hardware configuration of an embodiment of an analysis apparatus for a blow type molding process according to the present invention.

FIG. 4 is a flowchart showing a procedure of one embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of one embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a state of a parison and a mold before mold clamping according to the embodiment of the present invention.

FIG. 7 is a flowchart of a mold clamping process analyzing unit 2 according to an embodiment of the present invention.

FIG. 8 is a diagram schematically showing a molding process from completion of mold clamping to air blowing in one embodiment of the present invention.

FIG. 9 is a flowchart of an air blowing process analyzing unit 3 according to an embodiment of the present invention.

FIG. 10 is a diagram showing an example of a shape definition by CAD according to an embodiment of the present invention.

FIG. 11 is a diagram corresponding to FIG. 10 and illustrating an example of a shape definition based on a minute element model.

FIG. 12 is a diagram showing a calculation result of a deformation behavior of a parison in a mold clamping step according to an embodiment of the present invention.

FIG. 13 is a view showing a calculation result of a deformation behavior of a parison in an air blowing step according to an embodiment of the present invention.

FIG. 14 is a diagram showing CAD data of a mannequin used for clothing simulation according to an embodiment of the present invention.

FIG. 15 shows C of the mannequin in one embodiment of the present invention.
It is the figure which showed the calculation result of the clothing simulation using AD data.

[Explanation of symbols]

 1: die 2: parison 3: mold 4: parison 5: mold 6: blowing air 10: line defining a curved surface 11: line defining a curved surface 12: curved surface 13: element 14: node 101: computer 102: auxiliary Storage device 103: input device 104: display device 105: CAD device

Claims (12)

[Claims] 1. A cavity shape model is created based on the shape of a mold to which a parison is pressed while being deformed.
A parison shape model composed of a plurality of minute elements is created based on the initial shape of the parison, and a contact state between the molding die and the parison based on a relative motion between each minute element of the parison shape model and the cavity shape model. A method for analyzing a blow-type molding process, wherein at least a part of the cavity shape model is modeled by a function describing the shape of the molding die. 2. The function is obtained based on positions of a plurality of points representing a curved surface that matches or approximates at least a part of the shape of the molding die and / or geometric parameters of the curved surface. 2. The method for analyzing a blow-type molding process according to claim 1, wherein: 3. The function according to claim 1, wherein the function is obtained based on CAD data of the molding die.
Or the method for analyzing the blow-type molding process according to 2. 4. A cavity shape model data input means for receiving a data input of a cavity shape model based on the shape of a mold to which a parison is pressed while being deformed,
Parison shape model data input means for receiving data input of a parison shape model composed of a plurality of microelements based on the initial shape of the parison; each microelement of the parison shape model input by the parison shape model data input means and the cavity Relative movement calculating means for calculating relative movement of the cavity shape model input by the shape model data input means; and a contact state for obtaining a temporal change in a contact state between the molding die and the parison based on the obtained relative movement. An analysis apparatus for a blow-type molding process, comprising: a calculation unit, wherein the cavity shape model data input unit includes a plurality of points representing a curved surface that matches or approximates at least a part of the shape of the molding die. Accept input of position and / or geometric parameters of said surface Wherein the contact state calculating means is configured to calculate a geometrical relationship between a function obtained based on the positions and / or geometrical parameters of the plurality of points received by the cavity shape model data inputting means and each micro element of the parison shape model. An apparatus for analyzing a blow-type molding process, wherein a state of contact between the two is calculated based on a positional relationship. 5. The cavity shape model data input means receives CAD data of a molding die.
An apparatus for analyzing a blow-type molding process according to item 1. 6. A cavity shape model is created based on the shape of a mold to which a parison is pressed while being deformed,
A parison shape model composed of a plurality of minute elements is created based on the initial shape of the parison, and a contact state between the molding die and the parison based on a relative motion between each minute element of the parison shape model and the cavity shape model. Is determined, the shape and / or molding conditions of the molding die are determined based on the obtained information on the contact state, and the shape and / or
Or a blow-type molded product manufacturing method for manufacturing a blow-type molded product based on the molding conditions, wherein at least a part of the cavity shape model is modeled by a function describing the shape of the molding die. Characteristic method of manufacturing blow-type molded products. 7. A method for producing a blow-type molded product, wherein the blow-type product is molded by blow molding, thermoforming or vacuum molding. 8. An interference shape model is created based on the shape of an interference object to which the flexible film is pressed while being deformed, and a flexible film shape model including a plurality of minute elements is created based on the initial shape of the flexible film. An analysis method of a flexible film body deformation process for obtaining a contact state between the interfering object and the flexible film body based on a relative motion between each minute element of the flexible film body shape model and the interference shape model, A method of analyzing a deformation process of a flexible membrane, wherein at least a part of the interference shape model is modeled by a function describing a shape of the interference object. 9. An interference shape model data input means for receiving data input of an interference shape model based on a shape of an interference object pressed while deforming a flexible film, and a plurality of minute elements based on an initial shape of the flexible film. Flexible membrane shape model input means for receiving data input of the flexible membrane shape model, and inputting of each minute element of the flexible membrane shape model input by the flexible membrane shape model data input means and the interference shape model data Input by means,
A relative movement calculating means for calculating a relative movement of the interference shape model; and a contact state calculating means for calculating a temporal change of a contact state between the interference object and the flexible film body based on the obtained relative movement. An apparatus for analyzing a deformation process of a flexible film body, wherein the interference shape model data input means includes: a position of a plurality of points representing a curved surface that matches or approximates the shape of at least a part of the interfering object and / or the curved surface The contact state calculating means is flexible with a function obtained based on the positions and / or geometric parameters of the plurality of points received by the interference shape model data input means. The flexible membrane deformation process is characterized in that the contact state between the two is calculated based on the geometrical positional relationship between each microelement of the membrane shape model. Analysis apparatus. 10. An interference shape model is created based on the shape of an interference object to which the flexible film is pressed while being deformed, and a flexible film shape model including a plurality of minute elements is created based on an initial shape of the flexible film. Then, a contact state between the molding die and the flexible film body is obtained based on a relative motion between each micro element of the flexible film body shape model and the interference shape model, and based on the obtained information on the contact state. A method of manufacturing a flexible film body that determines a shape of the flexible film body and manufactures a flexible film body product based on the shape, wherein at least a part of the interference shape model describes a shape of the interference object. A method of manufacturing a flexible membrane product characterized by modeling by a function. 11. A storage medium storing software for operating a computer so that each procedure of the analysis method according to claim 1 can be executed using the computer. 12. A storage medium storing software for operating a computer so that each procedure of the analysis method according to claim 8 can be executed using the computer.