JP5260593B2 - Mold and mold manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding mold capable of manufacturing a good molded product whose crease and crack are reduced by amending a shape of the molding mold with a non-developable surface to a molding suitable for press molding, and to provide a method for manufacturing the molded product. <P>SOLUTION: In the molding mold having the first developable surface, the second developable surface and the non-developable surface connecting the first developable surface and the second developable surface, the shape of the non-developable surface is amended so that all of the crossing lines of the non-developable surface and a plurality of planes arranged in the direction connecting the first developable surface, the non-developable surface and the second developable surface have the same length. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a mold that is manufactured based on a mold model that corrects a mold model into a shape suitable for press molding, and a method for manufacturing a molded product.

Conventionally, fiber reinforced resin composites such as thermosetting resin composites and thermoplastic resin composites have been used as structural members for aircraft, automobiles, ships, trains, and the like. The structural member is manufactured by pressing a prepreg laminated product obtained by laminating a fiber reinforced resin composite material on a flat plate against a molding die, and autoclaving (baking) the molded prepreg laminated product.
For example, JP 2000-280364 A (Patent Document 1) includes a lower mold having a substantially rectangular parallelepiped shape in which a plurality of rods are erected on both ends of the upper surface, and a pair of upper molds combined with the lower mold. The upper die has an inverted L-shaped cross section, and has a hole through which a guide rod is inserted in the upper portion of the upper die, and a molding apparatus having a curved surface portion that spreads outward at the lower end of the upper die. A technique for press molding is disclosed. According to this technique, it is possible to mold a composite material molded product having a stable quality without generating wrinkles in the molded product.

JP 2000-280364 A (page 2-11, Fig. 1-3)

By the way, there are various shapes for the mold for pressing the prepreg laminated product. An example is shown in FIG. The mold shown in FIG. 27 includes two partial cylindrical surfaces S01 and S05 cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other. A plane S03 orthogonal to the central axis of the two partial cylindrical surfaces S01 and S05, and fillet surfaces S02 and S04 that smoothly connect the plane S03 and each of the partial cylindrical surfaces S01 and S05 with a certain curvature deformation. Yes.
In such a mold, the fillet surface becomes a non-expandable surface, and therefore, when a prepreg laminate on a flat plate is simply pressed against the mold having the above shape, wrinkles and cracks are generated.
And about such a shaping | molding die, even if the technique currently disclosed by the said patent document 1 was used, reduction of a wrinkle was not able to be aimed at.

  The present invention has been made to solve the above-described problems. By correcting a mold having a non-expandable surface into a shape suitable for press molding, it is possible to manufacture a high-quality molded product with reduced wrinkles and cracks. An object of the present invention is to provide a method for determining the shape of a mold, a mold, a method for manufacturing a molded product, and the like.

  The inventors have exemplified a mold model as shown in FIG. 27 as a mold model having a non-expandable surface, and analyzed the curved surface of the mold model, for example, by obtaining a Gaussian curvature, thereby causing wrinkles and cracks. The cause of this was clarified.

Here, the Gaussian curvature is described below.
At a point P on the curved surface S as shown in FIG. 28, a unit vector perpendicular to the tangent plane is a unit normal vector n, a plane including the unit normal vector n is a normal plane, and this normal plane and the curved surface S The line of intersection with is called the normal section.
When the normal plane is rotated around the unit normal vector n using the differential of the normal cross section as a curvature, the relationship between the rotation angle θ and the curvature is obtained as a graph as shown in FIG. 29, for example.

Here, the maximum curvature K ₁ and the minimum curvature K ₂ are referred to as the principal curvature of the curved surface S at the point P, and a value obtained by multiplying these principal curvatures K ₁ and K ₂ is a Gaussian curvature Kg, and an average value is an average curvature Km. . And the shape of the curved surface S can be grasped | ascertained by these Gauss curvature Kg and average curvature Km.
FIG. 30 shows an example of a shape determined by the Gaussian curvature and the average curvature. As shown in this figure, if the Gaussian curvature Kg = 0, that is, if one or both main curvatures are zero, the curved surface S becomes a developable surface. Further, if the Gaussian curvature Kg takes a negative value, the curved surface S has a bowl shape. Conversely, if the Gaussian curvature Kg takes a positive value, the curved surface S becomes a dish-type.

  Then, as a result of obtaining the above-mentioned Gaussian curvature Kg for the mold model shown in FIG. 27, the Gaussian curvature Kg of the outer fillet surface S02 with respect to the central axis takes a positive value, and the inner fillet surface S04 It was confirmed that the Gaussian curvature has a negative value. That is, from the table shown in FIG. 30, it was confirmed that the outer fillet curved surface S02 of the mold model was a dish shape and the inner fillet curved surface S04 was a bowl shape.

Next, it was verified what kind of wrinkles would occur when a molding material sheet was attached to a bowl-shaped curved surface and a dish-shaped curved surface. For example, when a flat molding material sheet is affixed to a bowl-shaped curved surface, it was confirmed that wrinkles occur in the center as shown in FIG. In addition, when a flat molding material sheet was affixed to the dish-shaped curved surface, it was confirmed that wrinkles occurred at the ends as shown in FIG. This is considered to be due to the fact that the girth length at the center (the circumferential length of the curved surface) is short in the bowl type, and the girth length at the end is short in the dish type.
Furthermore, a molded product manufactured by press-molding a flat molding material sheet on the mold model was analyzed. As a result, as shown in FIG. 33, it was confirmed that wrinkles were noticeably generated in the circumferential direction of the mold model.
From the above, the cause of wrinkles is thought to be due to the mismatch of the girth lengths at the end and center of the curved surface. The result of the verification that it is effective to check with a Gaussian curvature distribution to distinguish between a developable surface and a non-expandable surface was obtained.

  The present invention has been made on the basis of the verification results as described above, and is a high-quality molding in which wrinkles and cracks are reduced by correcting the shape of the molding die including the non-expandable surface to a shape suitable for press molding. The following methods are proposed to enable the manufacture of products.

  A reference example of the present invention is a method for determining a shape of a mold model for correcting the mold model into a model shape suitable for press molding, an analysis process for performing a curved surface analysis of the mold model, and a result of the analysis process A non-developable surface extraction process for extracting a non-developable surface, and a correction process for correcting the shape of the non-developable surface so as to bring the non-developable surface closer to the developable surface. A method for determining the shape of a mold model is provided.

  According to the method for determining the shape of the mold model according to the reference example of the present invention, the mold model is subjected to a curved surface analysis, and a non-expandable surface is extracted based on the result of the curved surface analysis. Since the shape of the non-developable surface is corrected so as to be close to the developable surface, the non-developable surface included in the corrected mold model can be extremely reduced, and wrinkles can be greatly reduced. .

  In the method for determining a shape of the mold model described above, the analysis process obtains a Gaussian curvature distribution of the mold model, and the non-expandable surface extraction process sets a region where the Gaussian curvature is not zero as a non-expandable surface. It is preferable that the extracting process corrects the shape of the non-expandable surface so that the Gaussian curvature of the non-expandable surface approaches zero.

  In this way, the Gaussian curvature distribution of the mold model is obtained, a region where the Gaussian curvature is not zero is extracted from this Gaussian curvature distribution as a non-developable surface, and the Gaussian curvature of the extracted non-developable surface approaches zero. Since the shape of the non-developable surface is corrected, extraction of the non-developable surface and correction of the non-developable surface can be performed very simply.

In the mold model shape determination method described above, it is preferable that the correction process changes a radius of curvature of the non-expandable surface.
Thus, by changing the curvature radius of the non-developable surface, the non-developable surface can be easily corrected.

A reference example of the present invention is a mold model including a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. A method for determining a shape of a mold model that is corrected to a model shape suitable for press molding, wherein the mold model is arranged in a direction connecting the first developable surface, the non-expandable surface, and the second developable surface. Provided is a method for determining the shape of a mold model for correcting the shape of the non-expandable surface so that all the lengths of intersecting lines of a plurality of planes and the non-expandable surface coincide.
According to the reference example of the present invention, the length of the line of intersection between the plurality of planes arranged in the direction connecting the first developable surface, the non-developable surface, and the second developable surface and the non-developable surface. Since the shape of the non-developable surface is corrected so that they all match, the non-developable surface can be easily brought close to the developable surface, and wrinkles and cracks of the molded product can be reduced.
The plurality of planes do not intersect each other. The plurality of planes can be arbitrarily arranged according to the shape of the target mold model.

  In the above-described method for determining the shape of the mold model, it is preferable to modify the shape of the non-expandable surface by changing the radius of curvature of the intersecting line. Thereby, it becomes possible to perform shape correction easily.

A reference example of the present invention is a mold model including a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. A method for determining a shape of a mold model that is corrected to a model shape suitable for press molding, wherein the mold model is arranged in a direction connecting the first developable surface, the non-expandable surface, and the second developable surface. A method for determining the shape of a mold model that corrects the shape of the non-expandable surface so that all the lengths of intersections between the non-expandable surface and a plurality of planes that intersect the plane and do not intersect with each other coincide with each other. provide.
According to the reference example of the present invention, it intersects with a plane arranged in a direction connecting the first developable surface, the non-developable surface, and the second developable surface, and a plurality of planes that do not intersect with each other. The shape of the non-expandable surface is corrected so that the lengths of the intersection lines with the extended surface all match. Thereby, a non-expandable surface can be brought close to a expandable surface, and wrinkles and cracks of a molded product can be reduced.
The plurality of planes do not intersect each other. The plurality of planes can be arbitrarily arranged according to the shape of the target mold model.

In the shape determining method of the mold model described above, the curvature at the boundary between the first developable surface and the non-developable surface and the boundary between the non-developable surface and the developable surface is smooth. In addition, it is preferable to correct the shape of the non-expandable surface so as to be continuous.
By correcting the shape of the non-expandable surface in this way, wrinkles and cracks in the molded product can be further reduced.

A reference example of the present invention is a first curved surface including a first developable surface, a second developable surface, and a non-expandable surface connecting the first developable surface and the second developable surface. A mold model shape determining method for correcting a mold model having a model shape suitable for press molding, wherein the first developable surface, the non-expandable surface, and the second developable surface are The shape of at least one of the first developable surface and the second developable surface is such that the lengths of intersecting lines between the plurality of planes arranged in the connecting direction and the first curved surface all coincide. A method for determining the shape of a mold model to be corrected is provided.
According to the reference example of the present invention, the length of the line of intersection between the first curved surface and the plurality of planes arranged in the direction connecting the first developable surface, the non-expandable surface, and the second developable surface. The shape of at least one of the first developable surface and the second developable surface is corrected so that all of the two match. As a result, wrinkles and cracks can be reduced.
The plurality of planes do not intersect each other. The plurality of planes can be arbitrarily arranged according to the shape of the target mold model.

The present invention obtains a Gaussian curvature distribution of the mold model and performs a curved surface analysis, and based on the result of the curved surface analysis, extracts a region where the Gaussian curvature is not zero as a non-developable surface, By forming the shape of the non-expandable surface so that the positive Gaussian curvature and the negative Gaussian curvature approach zero, a mold model suitable for press molding is generated, and based on the generated mold model A manufactured mold is provided.

The present invention provides a molding die comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. to match all the length of the intersection of the plurality of planes the non developable surfaces, including any curvature lines on the non-developable surfaces connecting the developable surfaces before Symbol second developable surfaces of By this, the shaping | molding die in which the said non-expandable surface was formed so that the positive Gauss curvature in the said non-expandable surface and a negative Gauss curvature may approach zero is provided.

The present invention provides a molding die comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. said plurality of planes intersecting the plane containing the arbitrary line of curvature on the non-developable surfaces connecting the developable surfaces before Symbol second developable surfaces of intersection of the non-developable surfaces the length By making them all coincide with each other, there is provided a mold in which the non-expandable surface is formed so that the positive Gaussian curvature and the negative Gaussian curvature of the non-expandable surface approach zero .

The present invention provides a molding die comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. to match all the length of the intersection of the plurality of planes the Hikaten surface including any line of curvature on the non-developable surfaces connecting the developable surfaces before Symbol second developable surfaces of To provide a mold in which at least one of the first and second developable surfaces is formed such that the positive Gaussian curvature and the negative Gaussian curvature on the non-expandable surface approach zero. .

The present invention obtains a Gaussian curvature distribution of the mold model and performs a curved surface analysis, and based on the result of the curved surface analysis, extracts a region where the Gaussian curvature is not zero as a non-developable surface, By forming the shape of the non-expandable surface so that the positive Gaussian curvature and the negative Gaussian curvature approach zero, a mold model suitable for press molding is created, and based on the created mold model Provided is a method for producing a molded article, which includes a step of pressing and molding a molding material sheet using the produced mold.

The present invention provides a molding die comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. to match all the length of the intersection of the plurality of planes the non developable surfaces, including any curvature lines on the non-developable surfaces connecting the developable surfaces before Symbol second developable surfaces of A step of pressing and molding a molding material sheet using a molding die in which the non-developable surface is formed so that the positive Gaussian curvature and the negative Gaussian curvature in the non-developable surface approach zero. A method for producing a molded product is provided.

The present invention provides a molding die comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. said plurality of planes intersecting the plane containing the arbitrary line of curvature on the non-developable surfaces connecting the developable surfaces before Symbol second developable surfaces of intersection of the non-developable surfaces the length By making all match , using a molding die in which the non-expandable surface is formed so that the positive Gaussian curvature and the negative Gaussian curvature on the non-expandable surface approach zero , the molding material sheet is pressed and molded. The manufacturing method of the molded article which comprises the process to perform is provided.

The present invention provides a molding die comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces. to match all the length of the intersection of the plurality of planes the Hikaten surface including any line of curvature on the non-developable surfaces connecting the developable surfaces before Symbol second developable surfaces of By using a mold in which at least one of the first and second developable surfaces is formed so that the positive Gaussian curvature and the negative Gaussian curvature on the non-expandable surface approach zero. The manufacturing method of the molded article which comprises the process of pressing and shape | molding a shaping | molding raw material sheet | seat is provided.

The reference example of the present invention includes an analysis step for analyzing a curved surface of the shape of the mold, a calculation step for calculating a girth length of a surface based on a result of the curved surface analysis, and depending on the girth length, There is provided a method for producing a molded product, comprising: a pressing step of pressing each end of a molding material sheet on the molding die against the molding die while compressing or pulling.

The reference example of the present invention is determined according to the analysis step of performing a curved surface analysis of the shape of the mold, the calculation step of calculating the girth length of the surface based on the result of the curved surface analysis, and the girth length. And a pressing step for pressing the molding material sheet cut into the molding die.

The reference example of the present invention includes an analysis step for analyzing the curved surface of the shape of the mold model, a calculation step for calculating the girth length of the surface of the mold model based on the result of the curved surface analysis, and the girth length Accordingly, there is provided a method for producing a molding material sheet comprising a cutting step of cutting the molding material sheet.

  The reference example of the present invention includes two partial cylindrical surfaces obtained by cutting two cylindrical surfaces having different radii arranged concentrically by two planes including a central axis and arranged at an angle to each other, A mold model having a plane perpendicular to the central axis of the partial cylindrical surface and a fillet surface that smoothly connects the flat surface and each of the partial cylindrical surfaces with a certain curvature deformation is modified to a model shape suitable for press molding. There is provided a method for determining the shape of a mold model for correcting the shape of a fillet surface so that the circumferential lengths at the respective positions on the fillet surface coincide with each other.

Thereby, two cylindrical surfaces cut out by two planes arranged concentrically with two planes having different radii and including a central axis, and the central axes of the two partial cylindrical surfaces In a mold model comprising a plane orthogonal to the plane, and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation, a circumferential direction (hereinafter referred to as a “longitudinal direction”) at each position on the fillet surface. .)), The shape of the fillet surface is modified so that the lengths of the fillet surfaces coincide with each other, so that the circumference of the fillet surface can be made constant.
As a result, it is possible to eliminate the distortion in the longitudinal direction in which the occurrence of wrinkles was noticeable, so that wrinkles and cracks can be reduced.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. A mold model having a plane perpendicular to the central axis of a cylindrical surface and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation is corrected to a model shape suitable for press molding. A method for determining the shape of a mold model, wherein the mold model corrects the shape of the fillet surface so that the lengths of the outer peripheries of the respective sections match when the mold model is cut out in a plane including the central axis. A shape determination method is provided.

  According to the reference example of the present invention, two partial cylindrical surfaces obtained by cutting two cylindrical surfaces having different radii arranged concentrically by two planes including the central axis and arranged at an angle to each other, A mold model including a plane perpendicular to the central axis of the partial cylindrical surface and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation. Since the shape of the fillet surface is corrected so that the lengths of the outer circumferences of the respective cross sections match when cut out, the length of the outer circumference of the cross section can be made constant. Thereby, the distortion in the cross-sectional direction can be eliminated. In addition, it is possible to further reduce wrinkles and cracks by matching the lengths in the longitudinal direction and further matching the lengths in the cross-sectional direction.

Moreover, it is preferable that the shape of the fillet surface is corrected by changing the radius of curvature of the arc corresponding to the fillet surface in each cross section.
Thus, by changing the radius of curvature, the fillet surface can be brought close to the developable surface, so that wrinkles and cracks in the molded product can be greatly reduced.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. A mold model having a plane perpendicular to the central axis of a cylindrical surface and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation is corrected to a model shape suitable for press molding. A method for determining a shape of a mold model, wherein the shape of the plane is corrected so that the lengths of the outer peripheries of the respective sections when the mold model is cut out in a plane including the central axis are matched. A shape determination method is provided.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. A circumferential direction at each position on the fillet surface in a molding die comprising: a plane orthogonal to the central axis of the cylindrical surface; and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation A mold in which a fillet surface is formed so that the length of is matched with the maximum length is provided.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. A molding die comprising a plane perpendicular to the central axis of a cylindrical surface, and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation, and the molding die is a plane including the central axis. Provided is a mold in which a fillet surface is formed so that the lengths of the outer circumferences of the respective cross sections when a model is cut out are matched.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. In a mold model comprising a plane perpendicular to the central axis of a cylindrical surface, and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a certain curvature deformation, the molding is performed on a plane including the central axis. Provided is a molding die in which the plane is formed so that the lengths of the outer circumferences of the respective cross sections when the die model is cut out are matched.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. A circumferential direction at each position on the fillet surface in a molding die comprising: a plane orthogonal to the central axis of the cylindrical surface; and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation The manufacturing method of the molded article which comprises the process of pressing and shape | molding a shaping | molding raw material sheet | seat using the shaping | molding die in which the fillet surface was formed so that the length of this may correspond to the maximum length is provided.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. A molding die comprising a plane perpendicular to the central axis of a cylindrical surface, and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a constant curvature deformation, and the molding die is a plane including the central axis. A method of manufacturing a molded article comprising a step of pressing and molding a molding material sheet using a molding die on which a fillet surface is formed so that the lengths of the outer peripheries of the respective sections when the model is cut out are matched. provide.

  The reference example of the present invention includes two cylindrical surfaces cut out by two planes arranged concentrically and having two radii having different radii and including a central axis and arranged at an angle to each other, and the two parts. In a mold model comprising a plane perpendicular to the central axis of a cylindrical surface, and a fillet surface that smoothly connects the plane and each of the partial cylindrical surfaces with a certain curvature deformation, the molding is performed on a plane including the central axis. A method for producing a molded article comprising a step of pressing and molding a molding material sheet using a molding die in which the flat surface is formed so that the outer circumferences of the respective sections match when the mold model is cut out I will provide a.

  As described above, according to the present invention, it is possible to extremely reduce the non-developable surface that has been the cause of wrinkles and cracks, and thus it is possible to manufacture a high-quality molded product.

It is a block diagram which shows schematic structure of the three-dimensional shape processing apparatus which concerns on one Embodiment of this invention. It is a figure which shows an example of a shaping | molding die model provided with a non-expandable surface. FIG. 3 is a top view of FIG. 2 for explaining the shape of the mold model of FIG. 2. FIG. 4 shows a YZ (X = 0.0) cross-sectional view of the mold model shown in FIGS. 2 and 3. FIG. 3 is a diagram for explaining a plurality of planes for defining a circumferential direction and a cross-sectional direction in the mold model shown in FIG. 2. FIG. 3 is a diagram for explaining a procedure for matching the lengths in the circumferential direction in the mold model shown in FIG. 2. FIG. 3 is a diagram showing an example of a top view of the mold model when the circumferential lengths are matched in the mold model shown in FIG. 2. FIG. 3 is an enlarged view of an inner fillet surface S04 shown in FIG. 2. It is a figure which shows the fillet cross section when the shaping | molding die model shown in FIG. 2 is cut out by the some plane containing a Z-axis. It is the figure which showed the shape of inner part cylindrical surface S05 after correction | amendment by the shape determination method of the shaping | molding die model which concerns on the 2nd Embodiment of this invention, inner side fillet surface S04, and plane S03. It is the figure which showed the shape of outer side partial cylindrical surface S01 after correction | amendment by the shape determination method of the shaping | molding die model which concerns on the 2nd Embodiment of this invention, outer side fillet surface S02, and plane S03. It is the figure which contrasted and showed the change of the circumference before and after correction by the shape determination method of the shaping | molding die model which concerns on the 2nd Embodiment of this invention. It is the figure which contrasted and showed the change of the curvature of the cross-sectional direction before and after correction by the shape determination method of the shaping | molding die model which concerns on the 2nd Embodiment of this invention. It is the figure which contrasted and showed the change of the curvature of the circumferential direction before and after correction by the shape determination method of the shaping | molding die model which concerns on the 2nd Embodiment of this invention. It is a top view of the shaping | molding die model before correction. It is a side view of the shaping | molding die model before correction. It is a front view of the shaping | molding die model before correction. It is a top view of the shaping | molding die model after correction | amendment by the shaping | molding die model shape determination method which concerns on the 4th Embodiment of this invention. It is a side view of the shaping | molding die model after correction | amendment by the shape determination method of the shaping | molding die model which concerns on the 4th Embodiment of this invention. It is a front view of the shaping | molding die model after correction | amendment by the shape determination method of the shaping | molding die model which concerns on the 4th Embodiment of this invention. It is the flowchart which showed the process sequence of the shape determination method of the shaping | molding die model which concerns on the 5th Embodiment of this invention. It is a figure which shows the Gaussian curvature in the fillet surface of the shaping | molding die model before correction. It is a figure which shows the gauss curvature in the fillet surface of a shaping | molding die model after correcting the curvature radius of a fillet surface in the shape determination method of the shaping | molding die model which concerns on the 5th Embodiment of this invention. In the mold model shape determination method according to the fifth embodiment of the present invention, the mold model after the curvature radius of the fillet surface is corrected and the curvature is corrected so as to change smoothly and continuously. It is a figure which shows the Gaussian curvature in the fillet surface. It is a figure for demonstrating the manufacturing method of the molded article which concerns on the 2nd Embodiment of this invention. It is a figure which shows the shape of the shaping | molding raw material sheet | seat after cutting in the manufacturing method of the molded article which concerns on the 3rd Embodiment of this invention. It is a figure which shows an example of the conventional shaping | molding die. It is a figure for demonstrating Gaussian curvature. It is a figure which shows the relationship between the rotation angle (theta) obtained by rotating the normal plane around the unit normal vector n, and a curvature by making the curvature of the normal cross section in the curved surface shown in FIG. 28 into a curvature. It is a figure which shows an example of the shape determined by a Gaussian curvature and an average curvature. It is the figure which verified about the way of making a wrinkle when a flat molding material sheet was stuck on a bowl-shaped curved surface. It is the figure which verified about the way of making a wrinkle when a flat molding material sheet was stuck on the curved surface of a plate shape. It is the figure which verified that wrinkles had arisen remarkably in the section of the peripheral direction of a mold model.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a three-dimensional shape processing apparatus according to the present invention. As shown in FIG. 1, the three-dimensional shape processing apparatus according to the present embodiment is a computer system such as CAD (Computer Aided Design) or CAM (Computer Aided Manufacturing), and includes a CPU (Central Processing Unit) 1, RAM ( A main storage device 2 such as a Random Access Memory, an auxiliary storage device 3 such as an HDD (Hard Disk Drive), an input device 4 such as a keyboard and a mouse, an output device 5 such as a printer, and the like.
Various programs are stored in the auxiliary storage device 3, and the CPU 1 reads out the programs from the auxiliary storage device 3 to the main storage device 2 such as a RAM and executes them to execute various processes described later, for example, a three-dimensional shape model. And the transformation process of the created three-dimensional model are realized.

Next, in the three-dimensional shape processing apparatus having the above-described configuration, the shape determination method of the mold model for correcting the shape of the mold model having a non-expandable surface already drawn to a shape suitable for press molding Will be described.
[First Embodiment: Shape Determination Method of Mold Model]
In the present embodiment, a mold model having the shape shown in FIG. 2 is given as an example of a mold model having a non-expandable surface, and a method for correcting the mold model to a shape suitable for press molding will be described. .

FIG. 2 shows a mold model arranged in an O-XYZ orthogonal coordinate system. The mold model includes an inner partial cylindrical surface S05 and an outer partial cylindrical surface S01 having the Z axis as a central axis. A plane S03 is provided on the upper side in the drawing so as to connect the partial cylindrical surfaces S01 and S05. The plane S03 and the partial cylindrical surfaces S01 and S05 are smoothly connected by the outer fillet surface S02 and the inner fillet surface S04.
In this mold model, the inner partial cylindrical surface S05, the plane S03, and the outer partial cylindrical surface S01 are developable surfaces. Further, the outer fillet surface S02 and the inner fillet surface S04 are non-expandable surfaces.

As shown in FIG. 3, the inner partial cylindrical surface S05 includes a cylindrical surface C1 having a radius r1 with a Z axis (an axis that passes through the center O and is perpendicular to the paper surface) as a central axis, and includes the central axis Z. Are cut out by two planes F1 (corresponding to the Y-Z plane) and F2 that are arranged as shown in FIG.
Similarly to the inner partial cylindrical surface S05, the outer partial cylindrical surface S01 is also arranged such that the cylindrical surface C2 having a radius r2 (> r1) with the Z axis as the central axis includes the central axis Z and forms an angle θs with each other. Are cut out by two planes F1 (corresponding to the YZ plane) and F2.
The plane S03 is a part of a plane orthogonal to the Z axis. That is, when the XY plane is viewed in plan, a part of the sector having the central angle θs is cut out.
As shown in FIG. 2, the outer fillet surface S02 is a surface that smoothly connects the outer peripheral edge of the plane S03 and the outer partial cylindrical surface S01 with a constant curvature radius.
Similarly, the inner fillet surface S04 is a surface that smoothly connects the inner peripheral edge of the plane S03 and the inner partial cylindrical surface S05 with a certain radius of curvature.
FIG. 4 shows a YZ (X = 0.0) cross-sectional view of the mold model shown in FIGS. 2 and 3.

In the method for determining the shape of the mold model according to this embodiment, the shape of the mold model is corrected so that the circumferential length at each position of the mold model matches the maximum length. Here, the length in the circumferential direction is defined as follows.
As shown in FIG. 5, a plurality of planes N (only one plane is illustrated in FIG. 5) are arranged in a direction connecting the outer partial cylindrical surface S01, the outer fillet surface S02, and the plane S03. Then, a plurality of planes (only one plane is illustrated in FIG. 5) T intersecting the plane N are arranged. The length of the intersection line between the plane T and the mold model is defined as a circumferential length L.
The plane N may be arranged in a direction connecting the inner partial cylindrical surface S05, the inner fillet surface S04, and the plane S03. Further, the plurality of planes N do not cross each other, and the plurality of planes T do not cross each other.

For example, in the YZ sectional view shown in FIG. 4, division points for dividing the outer periphery of the cross section into 50 are set. Subsequently, the length L in each circumferential direction (see FIGS. 5 and 8) passing through each division point (hereinafter, the circumferential length is referred to as “circumferential length”), and the circumferential length L is the maximum. The dividing point Q and its length Lmax are specified.
Subsequently, as shown in FIG. 4, the distance between the dividing point Q and the Z axis, that is, the rotational radius Rmax in the circumferential direction is measured, and the outline in the circumferential direction at the dividing point Q is drawn on the XY plane. As a result, a partial curve K as shown in FIG. 6 is obtained.

Next, the circumference passing through each division point (not shown) set on the outer periphery of the cross section (see FIG. 4) is corrected so as to coincide with the maximum length Lmax.
Specifically, as shown in FIG. 4, the rotation radius Rv is measured at a certain dividing point A (Z = Zv). Subsequently, on the XY plane shown in FIG. 6, the rotation radius Rv is taken as the Y axis, and an arc Kv having a length Lmax with the origin O as the center is drawn. The X coordinate Rvsin θv and Y coordinate Rvcos θv of the other end of the arc are acquired.
The coordinate values (Xi, Yi, Zi) at each division point are acquired by performing the same processing as described above at the other division points.
For example, a molding model as shown in FIG. 7 can be obtained by smoothly connecting the coordinate values of the division points obtained by the above-described method. The mold model after the correction (solid line in the figure) has a slightly swollen shape with respect to the shape before the correction (dotted line in the figure). FIG. 7 is a model shown for grasping the feature of the outer shape, and is different from the actual model.
In the present embodiment, the YZ cross section shown in FIG. 4 is divided into 50 parts. However, as the number of divisions increases, it becomes possible to make the lengths of the circumferences coincide with each other with high accuracy.

[Second Embodiment: Shape Determination Method of Mold Model]
Next, a method for determining the shape of a mold model according to the second embodiment of the present invention will be described with reference to the drawings.
In the method for determining the shape of the mold model of the present embodiment, in the mold model shown in FIG. 2, the circumferential length at each position on the outer fillet surface S02 and the inner fillet surface S04 (the length L of each solid line shown in FIG. ) Modify the shapes of the outer fillet surface S02 and the inner fillet surface S04 so as to match the maximum length.
Specifically, as in the first embodiment described above, the maximum perimeter Lmax is specified. Thereafter, as shown in FIG. 8, the shape of the inner fillet surface S04 is corrected so that the circumference at each dividing point existing on the inner fillet surface S04 is the length Lmax. For example, as shown in FIG. 9, the curvature radius r ′ of each fillet section D obtained by cutting the inner fillet surface S04 of the mold model along a plane including the Z axis (not shown) varies for each fillet section D. By doing so, the shape of the inner fillet surface S04 is changed (hereinafter, the correction method for changing the curvature radius of the fillet section is referred to as “correction method 1”).
More preferably, the curvature at the boundary between the inner partial cylindrical surface S05 and the fillet surface S04 and the curvature at the boundary between the fillet surface S04 and the plane S03 are smooth and continuous, in other words, The shape of the arc of the fillet section D is corrected so that the ridgeline connecting the inner partial cylindrical surface S05, the fillet surface S04, and the plane S03 is a second-order differentiable curve (hereinafter, this correction method is referred to as “correction method 2”). That said.) For example, the arc shape of the fillet surface is corrected by changing the bulge of the arc. As a result, the mold model can be expressed by a very smooth curve, so that wrinkles and cracks in the molded product can be further reduced.
In the outer fillet surface S02, the same effect can be obtained by changing the shape of the fillet surface in the same manner.

Here, forming when the shapes of the inner fillet surface S04 and the outer fillet surface S02 are modified so that the circumferential length at each division point existing on the inner fillet surface S04 and the outer fillet surface S02 is the length Lmax. The shape of the mold model is shown in FIGS.
FIG. 10 shows the shapes of the inner partial cylindrical surface S05, the inner fillet surface S04, and the plane S03 after correction. FIG. 11 shows the shapes of the outer partial cylindrical surface S01, the outer fillet surface S02, and the plane S03 after correction.
As shown in FIG. 10, the inner fillet surface S <b> 04 has a shape that becomes narrower as it approaches the center. Moreover, as shown in FIG. 11, in outer fillet surface S02, it becomes a shape where a width | variety spreads, so that a center part is approached. This is considered to be because, as described above, in the mold model before correction, the inner fillet surface S04 has a bowl shape, and the outer fillet surface S02 has a dish shape.

Next, FIG. 12 is a diagram showing a comparison between the change in the circumference before the correction and the change in the circumference after the correction. FIG. 13 is a diagram showing a comparison between the change in curvature in the cross-sectional direction (see FIG. 8) before correction and the change in curvature in the cross-sectional direction after correction. FIG. 14 is a diagram showing a comparison between the change in the curvature in the circumferential direction (see FIG. 8) before the correction and the change in the curvature in the circumferential direction after the correction.
12 to 14, each division point (point sequence) set in the YZ cross section shown in FIG. 4 is taken on the X axis, and the circumferential length at each division point, the curvature in the cross sectional direction, the circumference are taken on the Y axis. Take the curvature in each direction.

On the X axis, the position of Z = 0 on the outer partial cylindrical surface S01 shown in FIG. 4 is set as a dividing point 1, and the dividing points 2 and 3 are set in this order along the outer periphery of the cross section.
The dividing points 11 to 21 are dividing points set on the outer fillet surface S02, and the dividing points 31 to 41 are dividing points set on the inner fillet surface S04.
In these figures, the solid line is before correction, and the two-dot chain line is the case where the curvature radius of the fillet section D is changed to match the circumference, that is, in the case of the correction method 1, the dotted line changes the curvature deformation of the fillet section D. Furthermore, when the shape of the fillet cross section D is deformed so that the curvature of the ridgeline connecting each partial cylindrical surface and the plane changes smoothly and continuously, each value in the case of the correction method 2 Is shown.

  From FIG. 12, in the mold model before the correction, the perimeter has changed significantly, but in the mold model after the correction, the perimeter at each division point is all in both the correction method 1 and the correction method 2. It can be confirmed that the length is the same.

FIG. 13 shows that the curvature in the cross-sectional direction is discontinuous before the correction and in the case of the correction method 1. In particular, the curvature is abrupt at the connection points between the partial cylindrical surfaces S01 and S05 and the fillet surfaces S02 and S04 (such as the dividing points 11 to 13) and the connection points between the plane S03 and the fillet surfaces S02 and S04. It can be confirmed that the value is high. On the other hand, in the case of the correction method 2, it can be confirmed that the curvature change at the connection point is smooth, and the curvature changes smoothly and continuously over the entire division point.
Similarly, in FIG. 14, the curvature in the circumferential direction at the connection location changes with a steep slope before the correction and in the case of the correction method 1. Even in the vicinity, it can be confirmed that the curvature in the circumferential direction changes with a gentle curve.

As described above, according to the present embodiment, by changing the radius of curvature of the fillet cross section D so that the circumferences of the fillet surfaces S02 and S04 that are non-developable surfaces coincide with each other, molding before correction is performed. It is possible to eliminate the wrinkles in the circumferential direction that have occurred in the molded product manufactured using the mold. This makes it possible to produce a high-quality molded product with few wrinkles and cracks.
Further, the curvature at the boundary portion between the inner cylindrical surface S05 and the fillet surface S04 and the curvature at the boundary portion between the fillet surface S04 and the plane S03 are smooth and continuous, in other words, the inner portion. By changing the shape of the fillet cross section D so that the ridge line connecting the cylindrical surface S05, the fillet surface S04, and the plane S03 is a second-order differentiable curve, each surface is transformed as shown in FIGS. Since it becomes possible to connect very smoothly, wrinkles and cracks in the molded product can be greatly reduced.
In the above-described embodiment, the circumferences of the fillet surfaces S02 and S04 are all matched. However, the circumferences of the fillet surface S02 and the fillet surface S04 may be individually matched. That is, the shape of the fillet surface S02 is changed so that the circumference of the fillet surface S02 is uniform, and similarly, the shape of the fillet surface S04 is changed so that the circumference of the fillet surface S04 is uniform. Also good.
In the above-described embodiment, the circumference is matched with the maximum length. However, the circumference is not limited to this example, and may be matched with the shortest circumference. In short, it is only necessary to set one base line in the circumferential direction and make the length of the base line coincide with the length of this base line.

[Third Embodiment: Shape Determination Method of Mold Model]
Next, a shape determination method according to the third embodiment of the present invention will be described with reference to the drawings.
In the shape determination method of the present embodiment, the shape of the fillet surface is set so that the lengths of the outer peripheries of the respective sections match when the mold model is cut out in a plane including the Z axis in the mold model shown in FIG. To correct.
In other words, a plurality of planes N (only one is illustrated in FIG. 3) arranged in a direction connecting the outer cylindrical surface S01, the outer fillet surface S02, and the plane S03 shown in FIG. ) Including a plurality of planes N. Then, the shape of at least one of the outer fillet surface S02 and the inner fillet surface S04 is changed so that the outer shapes of the mold model when cut by the plurality of planes N all match.

For example, the mold model is divided into 50 by a plurality of planes N including the Z axis (not shown) to obtain 51 YZ cross sections. Subsequently, the outer circumference of each YZ cross section is measured to identify the maximum length.
When the maximum length Dmax is specified in this way, the shapes of the outer fillet surface S02 and the inner fillet surface S04 are changed so that the outer circumference of each cross section matches the maximum length Dmax.
For example, by changing the radius of curvature r ′ of the fillet cross section D (see FIG. 9), the lengths of the outer circumferences are matched.
At this time, as in the shape determination method according to the second embodiment described above, the ridge line connecting the inner partial cylindrical surface S05 and the plane S03 or the ridge line connecting the outer partial cylindrical surface S01 and the plane S03 is continuous. In addition, it is preferable to correct the shape of the arc of the fillet cross section D so as to change smoothly. For example, the arc shape of the fillet surface is corrected by changing the swelling of the fillet cross section.

As described above, according to the method for determining the shape of the mold model according to the present embodiment, the lengths of the outer peripheries of the respective cross sections when the mold model is cut out from a plurality of planes N including the central axis match. Thus, since the shape of the fillet surface is corrected, the length of the outer periphery of the cross section can be made constant. Thereby, the distortion in the cross-sectional direction can be eliminated.
In particular, by combining with the method for determining the shape of the mold model according to the second embodiment of the present invention, the length in the circumferential direction can be matched and the length of the outer periphery of the cross section can be matched. Wrinkles and cracks generated in the product can be further reduced.

As described above, the shape of at least one of the outer fillet surface S02 and the inner fillet surface S04 is not corrected so that the overall length when the mold model is cut out on the plurality of planes N is matched. The shape of the outer fillet surface S02 is modified so that the lengths of the intersection lines of the plane N and the outer fillet surface S02 all coincide, and the lengths of the intersection lines of the plurality of planes N and the inner fillet surfaces S04 are The shape of the inner fillet surface S04 may be corrected so that they all match.
In addition, the shapes of the outer fillet surface S02 and the inner fillet surface S04 may be modified so that the lengths of all the intersecting lines on the outer fillet surface S02 and the inner fillet surface S04 are matched.

[Fourth Embodiment: Shape Determination Method of Mold Model]
Next, the shape determination method in the 4th Embodiment of this invention is demonstrated with reference to drawings.
In the shape determining method according to the present embodiment, the outer peripheral lengths of the respective cross sections when the mold model is cut out in a plurality of planes N including the Z axis (not shown) in the mold model shown in FIG. As such, correct the shape of the developable surface. In the present embodiment, as an example, the shape of the plane S03, for example, the height of the plane S03 is corrected.
Here, FIGS. 15 to 17 respectively show a top view, a side view, and a front view of the mold model before correction. 18 to 20 show a top view, a side view, and a front view of the mold model after correction, respectively. As can be seen from these figures, in the modified generation model, the central portion H of the plane S03 is high, and the height gradually decreases from the central portion toward the end portion.

As described above, according to the shape determination method according to the present embodiment, in the mold model shown in FIG. 2, the length of the outer circumference of each cross section when the mold model is cut out by a plurality of planes N including the Z axis. Since the shape of the plane S03 is corrected so that they match, the length of the outer periphery of the cross section can be made constant. Thereby, the distortion in the cross-sectional direction can be eliminated, and wrinkles and cracks generated in the molded product can be reduced.
In particular, by combining with the method for determining the shape of the mold model according to the second embodiment, wrinkles and cracks generated in the molded product can be further reduced.

[Fifth Embodiment: Shape Determination Method of Mold Model]
Next, the shape determination method in the 5th Embodiment of this invention is demonstrated with reference to drawings. FIG. 21 is a flowchart showing the processing procedure of the molding model shape determination method according to the present embodiment.
In the shape determination method according to the present embodiment, first, a Gaussian curvature distribution is obtained by performing curved surface analysis (analysis process: step SA1 in FIG. 21), and then, based on the result of this Gaussian curvature distribution, A development surface is extracted (non-expandable surface extraction process: step SA2). Specifically, a region where the Gaussian curvature is not zero is extracted as a non-developable surface. Subsequently, it is determined whether or not the extracted non-developable surface is within an allowable range (step SA3 in FIG. 21). For example, it is determined whether the Gaussian curvature of the non-developable surface is equal to or less than a preset threshold value, that is, whether the non-developable surface is close to the developable surface. As a result, when the non-developable surface is not within the allowable range (“NO” in step SA3), the non-developable surface extracted in step SA2, for example, is brought into close proximity to the developable surface. The shape of the non-expandable surface is corrected so that the Gaussian curvature of the extended surface approaches zero (correction process: step SA4). In step SA4, for example, the Gaussian curvature is brought close to zero by changing the radius of curvature of the non-developable surface. In this manner, the processing from step SA1 to step SA4 is repeated, and when it is determined that the non-expandable surface is within an allowable range (“YES” in step SA3), the processing ends.

For example, when the curved surface analysis was performed on the mold model shown in FIG. 2, the Gaussian curvature showed a value other than zero on each fillet surface S02 and S04 and its periphery. Accordingly, the fillet surfaces S02 and S04 and the surrounding shape are corrected to bring the Gaussian curvature close to zero. As a correction method, for example, there is a method of changing the curvature radius of each fillet surface S02 and S04.
Here, FIG. 22 shows the Gaussian curvature on the fillet surface of the mold model before correction. FIG. 23 shows the Gaussian curvature on the fillet surface of the generated model when the curvature radii of the fillet surfaces S02 and S04 are corrected. Here, three Gaussian curvatures are shown as an example. 22 and 23, the plane S03 has a trapezoidal shape. However, since the plane S03 is a developable surface, the difference in shape here does not affect the effect of the present embodiment. .

As shown in FIGS. 22 and 23, according to the shape determination method of the present embodiment, the Gaussian curvature is remarkably lowered in the central portion where the Gaussian curvature has the highest value in the mold model before correction. I was able to. Thereby, it becomes possible to reduce distortion of the mold model.
Furthermore, in the mold model shown in FIG. 2, the curvature of the ridge line connecting the outer partial cylindrical surface S01 and the plane S03 and the ridge line connecting the plane S03 and the inner partial cylindrical surface S05 are smoothly and continuously. In order to change, in other words, the fillet surfaces S02 and S04, which were non-expandable surfaces, can be further improved by changing the swelling of the fillet surfaces S02 and S04 so that the ridgeline can be second-order differentiated. It becomes possible to approach the exhibition surface.

  FIG. 24 shows the Gaussian curvature when such correction is performed. As shown in FIG. 24, the Gaussian curvature could be extremely lowered at all locations. Furthermore, by unifying all the Gauss curvatures at each location to a negative value, it is possible to avoid mixing the dish mold and the bowl mold as shown in FIG. 22 and FIG. 23, thereby further reducing the distortion of the mold model. It becomes possible.

As described above, according to the method for determining the shape of the mold model according to the present embodiment, the mold model having a non-developable surface is subjected to a curved surface analysis, and the non-developable surface is determined based on the result of the curved surface analysis. The shape of the non-developable surface is modified so that the extracted non-developable surface is brought closer to the developable surface, so that the non-developable surface included in the modified mold model can be extremely reduced. Thus, wrinkles can be greatly reduced.
In addition, this technique is not limited to a mold model having a shape as shown in FIG. 2, and includes a first developable surface, a second developable surface, and first and second developable surfaces. The present invention can be applied to a mold model having various shapes including a non-expandable surface to be connected.

Next, the manufacturing method of the molded article which concerns on one Embodiment of this invention is demonstrated with reference to drawings.
[First Embodiment: Manufacturing Method of Molded Product]
Hereinafter, a method for manufacturing a molded product according to the first embodiment of the present invention will be described.
In the method for determining the shape of the molding die model according to the present embodiment, a molding die created based on the molding die model created by the method for determining the shape of the molding die model according to the first to fifth embodiments described above is used. To produce a molded product.
Specifically, the molded product is manufactured by pressing the prepreg laminated product against the molding die from above the plane S03 of the molding die manufactured as described above. Thereafter, the molded product is completed through a process such as autoclave (baking). This finished product is used as a structural member of, for example, an aircraft, an automobile, a ship, and a train.
The prepreg laminated product is obtained by, for example, laminating a fiber reinforced resin composite material such as a thermosetting resin composite material or a thermoplastic resin composite material on a flat plate.
As described above, according to the method for manufacturing a molded product according to the present embodiment, a molded product is manufactured using a molding die having a shape suitable for press molding, so that a molded product with extremely little wrinkles and cracks can be manufactured. It becomes possible.

[Second Embodiment: Manufacturing Method of Molded Product]
Next, the manufacturing method of the molded product which concerns on the 2nd Embodiment of this invention is demonstrated with reference to drawings.
In the method for manufacturing a molded product according to the present embodiment, unlike the method for manufacturing a molded product according to the above-described embodiment, a mold model created by the shape determination method according to the first to fifth embodiments described above. A molded product is manufactured using a conventional mold that is not modified without using a mold created based on the above.

Specifically, first, the shape of a mold used for manufacturing is subjected to a curved surface analysis (analysis process), and a non-expandable surface is extracted based on the curved surface analysis. Subsequently, the girth length of the surface on the non-expandable surface is calculated based on the result of the curved surface analysis (calculation step). Subsequently, according to the calculated girth length, each end of the prepreg laminate is compressed or pulled against the mold (pressing step) to produce a molded product.
For example, when a molded product is manufactured using the mold model shown in FIG. 2, first, this mold is subjected to curved surface analysis. As a result, the outer partial cylindrical surface S01, the plane S03, and the inner partial cylindrical surface S05 are determined to be developable surfaces because the Gaussian curvature is substantially zero. On the other hand, the outer fillet surface S02 has a positive numerical value for the Gaussian curvature, and the inner fillet portion S04 has a negative numerical value for the Gaussian curvature. Further, it can be seen from this Gaussian curvature that the outer fillet surface S02 has a dish shape and the inner fillet surface S04 has a bowl shape.

  Next, the girth lengths of the fillet surfaces S02 and S04 are calculated based on the result of the curved surface analysis. As a result, since the outer fillet surface S02 has a dish shape, the girth length at both ends is short as shown in FIG. 31, while the inner fillet surface S04 has a bowl shape, as shown in FIG. In addition, the girth length at the center is shortened. Accordingly, in the press molding process, as shown in FIG. 25, the portion corresponding to the outer fillet surface S02 is pressed against the mold while pulling the prepreg laminated product to both ends, and on the other hand, corresponds to the inner fillet surface S04. About the location to do, it presses against a shaping | molding die, compressing a prepreg laminated product to the center part.

  As described above, according to the method for manufacturing a molded article according to the present embodiment, a non-developable surface is extracted by analyzing a curved surface of the mold, and a girth length of the extracted non-developable surface is calculated. According to the calculated girth length, each end of the prepreg laminated product is pressed against the mold while being compressed or pulled to produce the molded product, so that wrinkles generated in the molded product can be greatly reduced. Become.

[Third Embodiment: Manufacturing Method of Molded Product]
Next, a method for manufacturing a molded product according to the third embodiment of the present invention will be described with reference to the drawings.
In the method for manufacturing a molded product according to the present embodiment, a molded product is manufactured using a conventional mold that is not modified, as in the method for manufacturing a molded product according to the second embodiment described above.
Specifically, first, the shape of a mold used for manufacturing is subjected to a curved surface analysis (analysis process), and a non-expandable surface is extracted based on the curved surface analysis. Subsequently, the girth length of the surface on the non-expandable surface is calculated based on the result of the curved surface analysis (calculation step). Subsequently, the prepreg laminated product is cut into a shape determined according to the calculated girth length (cutting step). Then, the cut prepreg laminated product is pressed against a mold (pressing step) to manufacture a molded product.
For example, when a molded product is manufactured using the mold shown in FIG. 2, the same results as in the method of manufacturing a molded product according to the second embodiment described above are obtained in the analysis step and the calculation step. . That is, the outer fillet surface S02 and the inner fillet surface S04 are extracted as non-developable surfaces, and the outer fillet surface S02 has a dish shape and the inner fillet surface S04 has a bowl shape from the result of Gaussian curvature. I understand that.

As a result, since the outer fillet surface S02 has a dish shape, the girth lengths at both ends are short as shown in FIG. 32, and on the other hand, the inner fillet surface S04 has a bowl shape, so that it is shown in FIG. As such, the girth length in the central portion is shortened. Accordingly, in the cutting step, as shown in FIG. 26, the portion corresponding to the outer fillet surface S02 of the prepreg laminate is cut long, while the portion corresponding to the inner fillet surface S04 is cut short.
In addition, when cutting, it is necessary to determine in advance the sticking start position (deployment base line) to the mold. Here, it is preferable to set the development base line at a position with the smallest distortion. For example, in the case of the forming die shown in FIG. 2, it is possible to set the ridgeline portion of the plane S03, that is, the middle arc between the arc closest to the rotation center and the arc far from the rotation center as the development base line.

  As described above, according to the method for manufacturing a molded article according to the present embodiment, a non-developable surface is extracted by analyzing a curved surface of the mold, and a girth length of the extracted non-developable surface is calculated. The molding material sheet is cut into a shape determined according to the calculated girth length, and the cut prepreg layered product is pressed against the mold to produce the molded product, greatly reducing wrinkles that occur in the molded product. It can be reduced.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

1 CPU
2 Main storage device 3 Auxiliary storage device 4 Input device 5 Output device

Claims (8)

The mold model is subjected to curved surface analysis by obtaining its Gaussian curvature distribution, and based on the result of the curved surface analysis , a region where the Gaussian curvature is not zero is extracted as a non-developable surface, and a positive Gaussian curvature in the non-developable surface A mold model suitable for press molding is generated by forming the shape of the non-expandable surface so that the negative Gaussian curvature approaches zero, and the mold manufactured based on the generated mold model Type. In a mold comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces, the first developable surface. by matching all pre Symbol length of intersection of the second developable surfaces and the non-developable surfaces on a plurality of planes and the non-developable surfaces, including any curvature line connecting the said non A mold in which the non-expandable surface is formed such that a positive Gaussian curvature and a negative Gaussian curvature on the expandable surface approach zero . In a mold comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces, the first developable surface. said to match all the length of the line of intersection of a plurality of planes intersecting the plane containing the arbitrary line of curvature on the non-developable surfaces and the non-developable surfaces connecting the front Stories second developable surfaces when The mold in which the non-expandable surface is formed so that the positive Gaussian curvature and the negative Gaussian curvature on the non-expandable surface approach zero . In a mold comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces, the first developable surface. by pre SL match all the length of the intersection of the second developable surfaces and the non-developable surfaces plurality of planes and the Hikaten plane including any curvature line on connecting the said non A mold in which at least one of the first developable surface and the second developable surface is formed such that a positive Gaussian curvature and a negative Gaussian curvature on the developable surface are close to zero . The mold model is subjected to curved surface analysis by obtaining its Gaussian curvature distribution, and based on the result of the curved surface analysis , a region where the Gaussian curvature is not zero is extracted as a non-developable surface, and a positive Gaussian curvature in the non-developable surface A molding model suitable for press molding is created by forming the shape of the non-expandable surface so that the negative Gaussian curvature approaches zero, and molding produced based on the created molding model A method for producing a molded product comprising a step of pressing and molding a molding material sheet using a mold. In a mold comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces, the first developable surface. by matching all pre Symbol length of intersection of the second developable surfaces and the non-developable surfaces on a plurality of planes and the non-developable surfaces, including any curvature line connecting the said non A molded article comprising a step of pressing and molding a molding material sheet using a molding die in which the non-expandable surface is formed so that a positive Gaussian curvature and a negative Gaussian curvature approach zero on a developable surface. Production method. In a mold comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces, the first developable surface. said to match all the length of the line of intersection of a plurality of planes intersecting the plane containing the arbitrary line of curvature on the non-developable surfaces and the non-developable surfaces connecting the front Stories second developable surfaces when A step of pressing and molding a molding material sheet using a molding die in which the non-developable surface is formed so that the positive Gaussian curvature and the negative Gaussian curvature in the non-developable surface approach zero. A method for manufacturing a molded product. In a mold comprising a first developable surface, a second developable surface, and a non-expandable surface connecting the first and second developable surfaces, the first developable surface. by pre SL match all the length of the intersection of the second developable surfaces and the non-developable surfaces plurality of planes and the Hikaten plane including any curvature line on connecting the said non A molding material sheet using a molding die in which at least one of the first developable surface and the second developable surface is formed so that the positive Gaussian curvature and the negative Gaussian curvature on the developable surface are close to zero. The manufacturing method of the molded article which comprises the process of pressing and shape | molding.

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