JP5969886B2 - Corresponding point calculation system and program, mold shape generation system and program - Google Patents

Description

  The present invention calculates the corresponding point for calculating the corresponding point between the mold shape of the molding die and the post-spring shape of the molded product when generating the mold shape of the molding die in anticipation of the spring back of the molded product. The present invention relates to a system and program, and a mold shape generation system and program for generating a mold shape of a mold in anticipation of springback of a molded product.

  In press molding of metal plates, even if press molding is performed using a molding die having a mold shape corresponding to the target shape of the molded product, springback occurs due to residual stress generated during press molding, and the molded product is targeted. It may not be possible to mold into a shape. On the other hand, there is known a method of generating a mold shape of a molding die in anticipation of a spring back of a molded product using a computer.

  As such a technique, the shape of the molding die according to the target shape of the molded product and the shape after the spring back of the molded product press-molded using an actual molding die having this mold shape It is known that the change is calculated by a difference method and this shape difference is reflected in the mold shape.

  FIG. 17 is an explanatory diagram for explaining a conventional method of generating a mold shape with the expectation of springback using a shape difference. FIG. 17 shows a molding die for forming a molded product having a cross-sectional hat shape extending in the longitudinal direction. The mold shape corresponding to the target shape of the molded product is indicated by a solid line L101, and has a mold shape L101. A post-springback shape of a molded product press-molded using the molding die is aligned with the die shape L101 and indicated by a broken line L102.

  As shown in FIG. 17, when generating a mold shape that anticipates springback using a conventional shape difference, first, a normal from an evaluation point P101 set to a mold shape L101 of the mold Is calculated as a corresponding point P102 of the post-springback shape L102 corresponding to the evaluation point P101 of the mold shape L101. Then, the normal vector d101 from the evaluation point P101 to the corresponding point P102 is calculated, and the normal vector d101 is multiplied by a coefficient α with α = −1 to calculate a prospective vector d′ 101 for estimating the springback.

  Similarly, for a large number of evaluation points set for the entire mold shape L101 of the molding die, corresponding points between the mold shape and the post-spring back shape are calculated in the normal direction, and a normal vector and A prospective vector is calculated, and a prospective mold shape L103 expecting a spring back indicated by a two-dot chain line in FIG. 17 is calculated.

  As described above, for example, Patent Document 1 discloses correction of a molding die CAD model as a method of calculating corresponding points between a die shape of a molding die and a shape after a spring back of a molded product using a normal vector. The corresponding point of the measurement data of the molding die corresponding to the reference point, the corresponding point of the molded product CAD model, and the corresponding point of the measured data of the molded product are calculated as intersections with the normal vector of the correction reference point. Is disclosed.

JP 2007-313852 A

  However, when calculating the corresponding point between the mold shape of the mold and the post-spring back shape of the molded product using the normal vector, and calculating the expected mold shape based on this corresponding point, Corresponding points between the mold shape of the mold and the post-spring shape of the molded product cannot be accurately calculated, such as when the spring back is large and deformation due to torsion or warping is large. It may not be possible to calculate with high accuracy. In particular, when a high-tensile steel plate or the like is used as the metal plate, the spring back is larger than when a mild steel plate is used, and such a tendency can be more remarkable.

  FIG. 18 is an explanatory diagram for explaining corresponding points between the mold shape of the molding die calculated using the normal vector and the post-spring back shape of the molded product. In FIG. 18, deformation due to torsion is large. Shows about the case. As shown in FIG. 18, the corresponding points Q111 of the post-springback shape L112 of the molded product in the normal direction from the evaluation points P111, P112, P113 of the mold shape L111 of the molding die corresponding to the target shape of the molded product, respectively. When Q112 and Q113 are calculated, the corresponding point Q112 of the post-springback shape L112 corresponding to the evaluation point P112 set between the evaluation points P111 and P113 of the mold shape L111 is the corresponding point Q111 of the post-springback shape L112. The point Q111 of the post-springback shape L112 corresponding to the evaluation point P111 of the mold shape L111 is not calculated as between the Q113, and the point Q111 of the post-springback shape L112 is lower than the tip of the projecting portion 115 projecting downward. It is calculated on the right side of the tip where it is considered to be located on the left side, and the mold shape L1 The corresponding points between 1 and springback after shape L112 may not be accurately calculated.

  FIG. 19 is another explanatory diagram for explaining the corresponding points between the mold shape of the molding die calculated using the normal vector and the post-spring shape of the molded product. In FIG. 19, in the longitudinal direction, It shows a case where deformation due to warping is large. As shown in FIG. 19, the corresponding points Q121 of the post-springback shape L122 of the molded product in the normal direction from the evaluation points P121, P122, P123 of the mold shape L121 of the molding die corresponding to the target shape of the molded product, respectively. When Q122 and Q123 are calculated, the corresponding point Q122 of the post-springback shape L122 corresponding to the evaluation point P122 set between the evaluation point P121 and the evaluation point P123 of the mold shape L121 is the corresponding point of the post-springback shape L122. It is not calculated as between Q121 and Q123, and the corresponding point Q121 of the post-springback shape L122 corresponding to the evaluation point P121 of the mold shape L121 is located at the protruding portion 125 protruding above the post-springback shape L122. The mold shape L is calculated on the projecting portion 126 projecting downward where possible. The corresponding point of 21 and the spring-back after the shape L122 may not be accurately calculated.

  In this way, when generating the mold shape of the molding die in anticipation of the spring back of the molded product, the corresponding points between the mold shape of the molding die and the post-spring shape of the molded product are calculated in the normal direction. Then, there is a case where the corresponding point between the mold shape of the molding die and the post-spring back shape of the molded product cannot be calculated with high accuracy, and the expected mold shape with the expectation of spring back may not be calculated with high accuracy.

  Therefore, the present invention can accurately calculate the corresponding points between the mold shape of the molding die and the post-spring shape of the molded product even when the spring back is large after press molding and deformation due to torsion and warpage is large. It is an object of the present invention to provide a calculation system and program, and a mold shape generation system and program that can accurately generate a mold shape of a molding mold that allows for a spring back of a molded product.

  In order to solve the above problems, the present invention is configured as follows.

  First, in the invention according to claim 1 of the present application, when generating a mold shape of a molding die in anticipation of a spring back of the molding product, the mold shape according to the target shape of the molding product, and the molding die A corresponding point calculation system for calculating a corresponding point with a post-springback shape of a molded product press-molded using a mold, the cross-sectional position acquisition means for acquiring a cross-sectional position set in the mold shape, and the cross-section For each cross section of the cross-sectional position acquired by the cross-sectional position acquired by the evaluation point acquisition means for acquiring the evaluation point at the position, the alignment means for aligning the mold shape and the post-springback shape, and the cross-sectional position acquisition means, Fitting means for fitting the cross-sectional shape of the post-springback shape aligned by the alignment means to the cross-sectional shape of the mold shape, and acquisition of the cross-sectional position A closest point calculating means for calculating the closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape for each cross-section at the cross-sectional position acquired by the step; Corresponding point calculation for calculating the corresponding point of the post-spring back shape corresponding to the evaluation point of the mold shape by returning the closest point calculated by the point calculating means to the cross-sectional shape before fitting of the post-spring back shape. Means.

  The invention according to claim 2 is a mold shape generation system for generating a mold shape of a molding die in anticipation of a spring back of the molded product, and a molding die according to a target shape of the molding product. Mold shape data acquisition means for acquiring shape data of a mold shape, molded product shape data acquisition means for acquiring shape data of a shape after springback of a molded product press-molded using the molding die, and the mold Cross-section position acquisition means for acquiring a cross-section position set in a mold shape, evaluation point acquisition means for acquiring an evaluation point at the cross-section position, and the mold shape and the molded product acquired by the mold shape data acquisition means Positioning means for aligning the post-springback shape acquired by the shape data acquiring means, and for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means, Fitting means for fitting the cross-sectional shape of the post-springback shape aligned by the alignment means to the cross-sectional shape of the mold shape, and for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means, the mold A closest point calculating means for calculating the closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the shape, and the closest point calculated by the closest point calculating means after the spring back Returning to the cross-sectional shape before fitting the shape, the corresponding point calculating means for calculating the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape, and the corresponding point from the evaluation point of the mold shape The displacement vector to the corresponding point of the post-springback shape calculated by the calculation means A displacement vector calculating means for calculating a load, and multiplying the displacement vector calculated by the displacement vector calculating means by a coefficient α satisfying α <0 to allow for a spring back of the molded product at the evaluation point of the mold shape Mapping the expectation vector at the evaluation point of the mold shape calculated by the expectation vector calculation means to the expectation vector calculation means for calculating the expectation vector of the mold, and the mold shape analysis model of the molding die, Probable mold shape calculation means that calculates the expected mold shape in consideration of the springback of the molded product by giving the expected vector to the mold shape analysis model as a forced displacement and deforming the mold shape using the finite element method It is characterized by having.

  According to a third aspect of the present invention, in the second aspect of the present invention, the molded product shape data acquisition means uses the position data obtained by actually measuring the post-spring back shape of the molded product molded using the molding die. It is characterized in that shape data created based on the data is acquired.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the molded product shape data obtaining means obtains the shape data of the post-spring shape of the molded product calculated using a finite element method. It is characterized by acquiring.

  Further, the invention according to claim 5, when generating the mold shape of the molding die in anticipation of the spring back of the molded product, the mold shape according to the target shape of the molded product, and the molding die A corresponding point calculation program for calculating a corresponding point with a post-springback shape of a molded product press-molded using a computer, a cross-sectional position acquisition means for acquiring a cross-sectional position set in the mold shape, and the cross-section Evaluation position acquisition means for acquiring an evaluation point at a position, alignment means for aligning the mold shape and the post-springback shape, and the alignment for each cross section of the cross sectional position acquired by the cross sectional position acquisition means Fitting means for fitting the cross-sectional shape of the post-springback shape aligned by means to the cross-sectional shape of the mold shape, the cross-sectional position For each cross-section at the cross-sectional position obtained by the obtaining means, the closest point calculating means for calculating the closest point in the cross-sectional shape after fitting the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape, and Corresponding to return the closest point calculated by the closest point calculating means to the cross-sectional shape before fitting of the post-springback shape, and to calculate the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape It is made to function as a point calculation means.

  The invention according to claim 6 is a mold shape generation program for generating a mold shape of a molding die in anticipation of a spring back of the molded product, and the computer performs molding according to the target shape of the molded product. Mold shape data obtaining means for obtaining shape data of a mold shape of a mold, molded product shape data obtaining means for obtaining shape data of a shape after spring back of a molded product press-molded using the molding die, Cross-section position acquisition means for acquiring a cross-section position set in the mold shape, evaluation point acquisition means for acquiring an evaluation point at the cross-section position, the mold shape and the shape of the molded product acquired by the mold shape data acquisition means Positioning means for aligning the post-springback shape acquired by the data acquisition means, a cross section of the cross sectional position acquired by the cross sectional position acquisition means In addition, fitting means for fitting the cross-sectional shape of the post-springback shape aligned by the alignment means to the cross-sectional shape of the mold shape, and for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means, The closest point calculating means for calculating the closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape, and the closest point calculated by the closest point calculating means as the springback Returning to the cross-sectional shape before fitting the rear shape, the corresponding point calculating means for calculating the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape, from the evaluation point of the mold shape, the corresponding point The displacement vector to the corresponding point of the post-springback shape calculated by the calculating means. A displacement vector calculating means for calculating a torque, for multiplying the displacement vector calculated by the displacement vector calculating means by a coefficient α satisfying α <0 to allow for a spring back of the molded product at the evaluation point of the mold shape Mapping the expectation vector at the evaluation point of the mold shape calculated by the expectation vector calculation means to the expectation vector calculation means for calculating the expectation vector, and the mold shape analysis model of the mold; Probable mold shape calculation means that calculates the expected mold shape in consideration of the springback of the molded product by giving the expected vector to the mold shape analysis model as a forced displacement and deforming the mold shape using the finite element method It is made to function as.

  According to a seventh aspect of the invention, in the invention of the sixth aspect, when the computer functions as the molded product shape data acquisition means, after the spring-back of the molded product molded using the molding die. It is characterized by functioning so as to acquire shape data created based on position data obtained by actually measuring the shape.

  According to an eighth aspect of the invention, in the invention of the sixth aspect, when the computer functions as the molded product shape data acquisition means, the spring of the molded product calculated using the finite element method is used. It is made to function so that shape data of a shape after back may be acquired.

  With the above configuration, according to the invention of each claim of the present application, the following effects can be obtained.

  First, according to the invention described in claim 1 of the present application, after aligning the mold shape of the molding die and the post-spring back shape of the molded product, the cross-sectional shape of the post-spring back shape is the gold for each cross section. The closest point in the cross-sectional shape after fitting of the post-springback shape that is the closest to the evaluation point in the cross-sectional shape of the mold shape is calculated, and the closest point in the cross-sectional shape after fitting of the post-springback shape is calculated. Returning to the shape, it is calculated as the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape.

  As a result, even when the spring back is large after press molding and deformation due to torsion or warping is large, the mold shape of the molding die used for generating the mold shape of the molding die in anticipation of the spring back of the molded product Corresponding points with the shape after the spring back of the molded product can be calculated with high accuracy. By using the corresponding points of the mold shape of the molding die thus calculated and the shape after the spring back of the molded product, the mold shape of the molding die that allows for the spring back of the molded product can be accurately generated. .

  According to the invention described in claim 2, after the mold shape of the molding die and the post-spring back shape of the molded product are aligned, the cross-sectional shape of the post-spring back shape is the die shape for each cross section. The closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape is calculated, and the closest point is converted to the cross-sectional shape before fitting of the post-springback shape. Returning, it is calculated as a corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape.

  Then, a displacement vector from the evaluation point of the mold shape to the corresponding point of the post-spring back shape is calculated, and a prospect vector at the evaluation point of the mold shape is calculated by multiplying the displacement vector by a coefficient α with α <0. Map the expected vector at the evaluation point of the mold shape to the analysis model of the mold shape of the molding die, give the expected vector as the forced displacement to the analysis model of the mold shape, and use the finite element method As a result, the expected mold shape is calculated in consideration of the spring back of the molded product.

  As a result, even when the spring back is large after press molding and deformation due to torsion or warping is large, the mold shape of the molding die used for generating the mold shape of the molding die in anticipation of the spring back of the molded product Corresponding points with the shape after the spring back of the molded product can be calculated with high accuracy, and the mold shape of the molding die that anticipates the spring back of the molded product can be accurately generated.

  According to the invention described in claim 3, by using the shape data created based on the position data obtained by actually measuring the shape after the spring back of the molded product molded using the molding die, It is possible to accurately generate a mold shape of a molding mold that anticipates springback.

  Further, according to the invention described in claim 4, it is necessary to actually press-mold using a molding die by using the shape data of the shape after the spring back of the molded product calculated using the finite element method. Without, it is possible to generate a mold shape of a molding die that allows for a spring back of the molded product.

  And according to the invention regarding the program of Claims 5-8, there can exist an effect similar to the invention of Claims 1-4 regarding a system by performing this with a computer.

It is a top view which shows the shaping | molding die which has a metal mold | die shape according to the target shape of the molded article used for the metal mold | die generation system which concerns on embodiment of this invention. It is a top view which shows the state which aligned the metal mold | die shape of the molding die shown in FIG. 1, and the shape after a spring back of a molded article. It is sectional drawing which shows the cross-sectional shape of the metal mold | die shape in the cross-sectional position C1 of FIG. 2, and the cross-sectional shape of the shape after a springback. It is sectional drawing which shows the state which fitted the cross-sectional shape of the shape after a spring back to the cross-sectional shape of a metal mold | die shape. It is the principal part enlarged view which expanded the principal part of FIG. It is a figure which shows the nearest point in the cross-sectional shape after fitting of the post-springback shape calculated from the evaluation point in the cross-sectional shape of a metal mold | die shape. It is a figure which shows the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape calculated from the closest point in the cross-sectional shape after fitting of the post-springback shape. It is a figure which shows the expectation vector for anticipating a springback. It is a figure which shows the analytical model of the metal mold | die shape which mapped the prospect vector. 1 is a block diagram illustrating an overall configuration of a mold shape generation system according to an embodiment of the present invention. It is a figure which shows the structure of the memory | storage device of the system shown in FIG. It is a flowchart which shows the metal mold | die production | generation operation | movement by the metal mold | die production | generation system which concerns on embodiment of this invention. It is a flowchart which shows the metal mold | die expectation operation | movement using a shape difference. It is a flowchart which shows the calculation operation | movement of the corresponding point in the shape after a spring back of the molded article corresponding to the evaluation point in the metal mold | die shape of a shaping die. It is a figure which shows the example of the corresponding point of the metal mold | die shape of the molding die calculated using the metal mold | die production | generation system which concerns on this embodiment, and the shape after a spring back of a molded article. It is a figure which shows another example of the corresponding point of the metal mold | die shape of the molding die calculated using the metal mold | die production | generation system which concerns on this embodiment, and the shape after a spring back of a molded article. It is explanatory drawing for demonstrating the method to produce | generate a metal mold | die shape in anticipation of a spring back using the conventional shape difference. It is explanatory drawing for demonstrating the corresponding point of the metal mold | die shape of a molding die calculated using the normal vector, and the shape after a springback of a molded article. It is another explanatory drawing for demonstrating the corresponding point of the metal mold | die shape of the molding die calculated using the normal vector, and the shape after a springback of a molded article.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
In the mold shape generation according to the embodiment of the present invention, when generating the mold shape of the molding mold, first, the shape data of the mold shape of the molding mold according to the target shape of the molded product, and the molding mold Using the shape data created on the basis of the position data obtained by actually measuring the post-spring back shape of the molded product press-molded using the mold, the mold shape of the molding die and the post-spring back shape of the molded product are aligned. To do.

  FIG. 1 is a plan view showing a molding die having a die shape corresponding to a target shape of a molded product used in a die shape generation system according to an embodiment of the present invention. In FIG. 1, only the die of the molding die is shown, but the punch of the molding die is formed according to the shape of the die. In FIG. 1, the X axis and the Y axis orthogonal to the molding surface of the molding die are taken, and the Z axis is shown in the normal direction from the molding surface.

  A mold shape 10 of the molding die shown in FIG. 1 is formed in a substantially rectangular parallelepiped shape, and a molding portion 12 for molding a substantially rectangular shaped product elongated in the longitudinal direction in a plan view is formed on the molding surface 11. Has been. The molding surface 11 of the mold shape 10 is formed according to the target shape of the molded product, and the molding surface 11 has two concave portions 11a and 11b extending in the longitudinal direction.

  FIG. 2 is a plan view showing a state in which the mold shape of the molding die shown in FIG. 1 is aligned with the post-springback shape of the molded product. As shown in FIG. 2, the mold shape 10 of the molding die shown in FIG. 1 and the post-spring shape 15 of the molded product are positioned by using a known best fit or three-point alignment that minimizes the shape error. To be combined. In the present embodiment, the post-springback shape 15 of the molded product is aligned with the mold shape 10 of the molding die.

  As the post-springback shape 15 of the molded product, shape data created based on position data such as STL data obtained by actually measuring the post-springback shape of the molded product actually press-molded using a molding die is used.

  In FIG. 2, the deformation amount of the molded product with respect to the target shape is also displayed using hatched hatching. The post-springback shape 15 of the molded product shown in FIG. 2 is that the portions indicated by arrows R1 and R2 are greatly deformed to the near side with respect to the target shape of the molded product, and the portions indicated by arrows R3 and R4 are the target shape of the molded product. On the other hand, it is greatly deformed to the back side, and deformation due to twisting occurs around the longitudinal axis.

  Next, in the present embodiment, the cross-sectional position set in the mold shape and the evaluation point at the cross-sectional position are acquired, and for each cross-section at the cross-sectional position, the aligned post-springback shape is fitted into the mold shape. Calculates the closest point after fitting the post-springback shape that is closest to the evaluation point of the mold shape, returns the closest point to the post-springback shape before fitting, and corresponds the post-springback shape corresponding to the evaluation point of the mold shape Calculate as a point.

  As shown in FIG. 1, with respect to the mold shape 10 of the molding die corresponding to the target shape of the molded product, there are a plurality of cross-sectional positions in the direction crossing the longitudinal direction of the molded product, specifically in the orthogonal direction. Set by In the present embodiment, Y coordinate positions C1 to C11 are set as the cross-sectional positions. The cross-sectional position can be set as appropriate, and can be set at predetermined intervals, for example.

  Further, an evaluation point for allowing a spring back is set at the cross-sectional position with respect to the mold shape 10 by the user. In FIG. 1, only the evaluation point P1 is shown at the cross-sectional position C1, but a large number of evaluation points are set at each cross-sectional position as shown in FIG. This evaluation point can be set as appropriate, and can be set, for example, at predetermined intervals.

  The setting of the cross-sectional positions C1 to C11 and the evaluation point P1 with respect to the mold shape 10 is performed by the user before the alignment between the mold shape 10 of the molding die and the post-springback shape 15 of the molded product. It may be performed after the alignment of the mold shape 10 and the post-spring back shape 15 of the molded product. Further, what is set before the alignment between the mold shape 10 of the molding die and the post-springback shape 15 of the molded product may be corrected after the alignment.

  When the cross-sectional position set in this way and the evaluation point at the cross-sectional position are acquired, the cross-sectional shape of the post-springback shape and the cross-sectional shape of the mold shape that are aligned are calculated for each cross-section of the cross-sectional position. The mold-shaped cross-sectional shape and the post-springback cross-sectional shape are fitted.

  FIG. 3 is a cross-sectional view showing the cross-sectional shape of the mold shape and the cross-sectional shape of the post-springback shape at the cross-sectional position C1 of FIG. As shown in FIG. 3, at the cross-sectional position C1, the post-springback shape L12 of the molded product is deformed upward with respect to the molding surface 11 at the portion indicated by the arrow R1 with respect to the mold shape L11 of the molding die. The portion indicated by the arrow R3 is greatly deformed downward with respect to the molding surface 11.

  FIG. 4 is a cross-sectional view showing a state in which the cross-sectional shape after the springback is fitted to the cross-sectional shape of the mold. In FIG. 4, the post-spring back shape after fitting the mold shape L11 and the post-spring back shape L12 shown in FIG. 3 is shown as L12 '.

  As shown in FIG. 4, the mold shape L11 and the post-springback shape L12 at the cross-sectional position C1 are fitted using a known least square method, and the post-springback shape L12 after fitting fitted to the mold shape L11 is performed. 'Is calculated. The post-springback shape L12 before fitting is rotated and translated to calculate the post-springback shape L12 'after fitting. In the present embodiment, the post-fitting back spring shape L12 'is calculated by rotational movement about the Y axis and parallel movement in the X axis direction and the Z axis direction.

  FIG. 5 is an enlarged view of a main part in which the main part of FIG. 4 is enlarged, and shows an enlarged part indicated by a one-dot chain line in FIG. As described above, a large number of evaluation points P1, P2, and P3 are set in the mold shape L11 at the cross-sectional position C1 shown in FIG. In FIG. 5 and FIGS. 6 to 8 to be described later, the evaluation points are indicated by black circles, and only the evaluation points P1 to P3 are denoted by reference numerals.

  When the post-springback shape is fitted to the mold shape at the cross-sectional position, the closest point in the post-springback shape after fitting closest to the evaluation point of the mold shape is calculated, and the closest point is after springback before fitting The shape is calculated as a corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape by returning to the shape.

  FIG. 6 is a diagram showing the closest point in the cross-sectional shape after fitting the post-springback shape calculated from the evaluation point in the cross-sectional shape of the mold shape. As shown in FIG. 6, nearest points Q1 ', Q2', Q3 'in the post-springback shape L12' after fitting closest to the evaluation points P1, P2, P3 in the mold shape L11 are calculated. In FIG. 6, the nearest point is indicated by a black triangle mark, and pairs of evaluation points P1, P2, P3 and nearest points Q1 ', Q2', Q3 'are connected by broken lines.

  FIG. 7 is a diagram showing the corresponding points of the post-springback shape corresponding to the evaluation points of the mold shape calculated from the closest point in the cross-sectional shape after fitting of the post-springback shape. When the nearest points Q1 ′, Q2 ′, Q3 ′ in the post-springback shape L12 ′ after fitting are calculated, as shown in FIG. 7, the nearest points Q1 ′, Q2 ′, Q3 ′ are after the springback before fitting. Returned to the shape L12, the corresponding points Q1, Q2, Q3 of the post-springback shape corresponding to the evaluation points P1, P2, P3 of the mold shape are respectively calculated. In the present embodiment, calculation is performed by moving the rotational movement around the Y axis moved by the fitting and the parallel movement in the X axis direction and the Z axis direction in opposite directions. In FIG. 7, the corresponding points are indicated by black square marks.

  In the present embodiment, the corresponding point is calculated by returning the closest point to the cross-sectional shape before the fitting of the post-springback shape by moving the movement by the fitting in the opposite direction, but the end point in the post-springback shape after the fitting is calculated. By calculating the distance from the edge to the nearest point and calculating the point from the end of the post-springback shape before fitting at the calculated distance as the corresponding point, the cross-sectional shape before fitting the post-springback shape It is also possible to return to and calculate the corresponding points.

  In this way, after fitting the post-springback shape to the die shape for each cross section, the nearest point of the post-springback shape after fitting is calculated from the evaluation point of the die shape, and the calculated nearest point is before fitting. Returning to the post-springback shape, the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape is calculated.

  When the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape is calculated, a displacement vector from the evaluation point of the mold shape to the corresponding point of the post-springback shape is calculated, and α = − By multiplying the correction coefficient α which is 1, a prospect vector at the evaluation point of the mold shape is calculated.

  As shown in FIG. 7, when the corresponding points Q1, Q2, Q3 of the post-springback shape L12 corresponding to the evaluation points P1, P2, P3 of the mold shape L11 are calculated, the evaluation points P1, of the mold shape L11, Displacement vectors d1, d2, and d3 to corresponding points Q1, Q2, and Q3 of the post-springback shape L12 are calculated from P2 and P3, respectively.

  FIG. 8 is a diagram showing a prospect vector for expecting a springback. When the displacement vectors d1, d2, d3 from the evaluation points P1, P2, P3 of the mold shape L11 to the corresponding points Q1, Q2, Q3 of the post-springback shape L12 are calculated, as shown in FIG. Multiplying d1, d2 and d3 by a correction coefficient α of α = −1 to calculate prospective vectors d1 ′, d2 ′ and d3 ′ at the evaluation points P1, P2 and P3 of the mold shape L11.

  In FIG. 8, the prospective vectors d1, d2 ′, d3 ′ at the evaluation points P1, P2, P3 of the mold shape L11 with respect to the cross-sectional position C1 are shown, but other cross-sectional positions C2 to C11 are also shown for each cross-section. Similarly, expectation vectors at evaluation points P1, P2, and P3 of the mold shape L11 are respectively calculated.

  In this way, when the expected vector at the evaluation point of the mold shape is calculated for all cross-sectional positions, the expected vector at the evaluation point is mapped to the analysis model of the mold shape of the molding die, and the mold shape A prospective vector is given to the analysis model as a forced displacement, and the mold shape is deformed by using the finite element method to calculate a prospective mold shape that anticipates the spring back of the molded product.

  FIG. 9 is a diagram showing an analysis model of a mold shape in which a prospect vector is mapped. In FIG. 9, the expected vectors at the respective evaluation points of the mold shapes L11, L21, and L31 calculated for the three cross-sectional positions are indicated by arrows. In FIG. 9, only the part indicated by reference numeral 11c is shown as an analysis model in which the mold shape 10 is divided into finite elements, but the entire mold shape 10 is divided into finite elements.

  As shown in FIG. 9, a mold shape 10 of a molding die is created as an analysis model divided into finite elements, and a prospect vector at an evaluation point of the mold shape is mapped to the analysis model of the mold shape 10. The Then, a prospective vector is given as a forced displacement to the analysis model of the mold shape 10 of the molding die, and the entire mold shape is continuously deformed by performing deformation analysis using the finite element method, so that the molded product The expected mold shape is calculated in anticipation of springback.

  As shown in FIG. 9, the expectation vector of the mold shape 10 is given to the evaluation point of the set cross-sectional position, and is given only for some of the nodes of the analysis model of the mold shape 10. The other nodes of the analysis model are continuously moved along with the nodes for which the prospective vector is set by the analysis using the finite element method, and the prospective mold shape is calculated for the entire mold shape.

  When mapping the expectation vector at the evaluation point of the mold shape 10 to the analysis model of the mold shape 10, if the evaluation point set in the mold shape is not set on the node of the analysis model, the evaluation point The prospective mold shape is calculated by assigning the prospective vector at the evaluation point to the nearest node. When the evaluation point of the mold shape 10 is not set on the node of the analysis model, an analysis model is created so as to form a new node corresponding to the evaluation point, and the expected mold is calculated. It is also possible to do so.

Next, a mold shape generation system according to an embodiment of the present invention will be described.
FIG. 10 is a block diagram showing the overall configuration of the mold shape generation system according to the embodiment of the present invention. As shown in FIG. 10, the mold shape generation system according to the present embodiment is configured with a computer 20 as the center, and the computer 20 includes a central processing unit 21 and data necessary for generating the mold shape of the mold. An input device 22 such as a keyboard for inputting the like, a display device 23 such as a display for displaying the mold shape of the molding die or the shape after the spring back of the molded product, and the like to generate the mold shape A storage device 24 such as a memory for storing the program and the like, and an output device 25 such as a printer for outputting the generated mold shape and the like.

  The central processing unit 21 controls the input device 22, the display device 23, and the output device 25, and is configured to be accessible to the storage device 24. Information input via the input device 22 is stored in the storage device 24. The corresponding points between the mold shape and the post-springback shape and the expected mold shape calculated using the corresponding points are stored in the storage device 24 using the program and data.

  FIG. 11 is a diagram showing the configuration of the storage device of the system shown in FIG. As shown in FIG. 11, the storage device 24 has a program storage unit and a data storage unit. In the program storage unit, a mold shape generation program for generating a mold shape of a molding die that anticipates spring back, a shape difference for calculating an expected mold shape that anticipates spring back using the shape difference Expected mold calculation program, corresponding point calculation program for calculating corresponding points between mold shape of mold and post-spring shape of molded product, shape data of mold shape of mold is divided into finite elements An analysis model creation program for creating an analysis model and a display program for displaying an input screen, a calculated expected mold shape, and the like are stored.

  On the other hand, the data storage unit stores a mold shape data file that stores the shape data of the mold shape corresponding to the target shape of the molded product, and a springback of the molded product that is press-molded using the molding die. Molded product shape data file storing shape data of rear shape, cross-section data file storing cross-section position set to mold shape, evaluation point data file storing evaluation points at the cross-section position, mold shape The corresponding point calculation result data file in which the corresponding points of the post-springback shape calculated from the evaluation points are recorded, and the expectation vector calculated from the evaluation points of the mold shape and the corresponding points of the post-springback shape is recorded. Prospect vector calculation result data file, predictive mold shape calculated using finite element method with predictive vector given to mold shape analysis model is recorded Such as mold prospective calculation result data file is provided that is.

Next, an operation for generating a mold shape in anticipation of springback will be described.
FIG. 12 is a flowchart showing a mold shape generation operation by the mold shape generation system according to the embodiment of the present invention. Before generating a mold shape that anticipates springback, the computer 20 first registers the mold shape data of the mold according to the target shape of the molded product by the user via the input device 22. At the same time, the shape data of the post-spring shape of the molded product press-molded using the molding die is registered, and the shape data of the mold shape and the shape data of the molded product are stored in the mold shape data file and the molded product shape data file, respectively. To be recorded. Further, the user registers the cross-sectional position of the mold shape for calculating the likelihood vector and the evaluation points at the cross-sectional position, and records them in the cross-section data file and the evaluation point data file.

  In this way, various data for generating a mold shape that anticipates spring back, specifically, the shape data of the mold shape, the shape data of the post-spring shape of the molded product, the cross-sectional position and the evaluation point are registered. In this state, calculation is performed for calculating the corresponding points between the mold shape and the post-springback shape and for generating the mold shape that allows for the springback.

  When generating the mold shape, first, as shown in FIG. 12, various data for generating the mold shape is acquired. Specifically, the shape data of the mold shape of the molding die corresponding to the target shape of the molded product is acquired (step S1), and the shape data of the post-spring back shape of the molded product press-molded using the molding die. Is acquired (step S2), the cross-sectional position set in the mold shape is calculated to calculate the expected vector (step S3), and the evaluation point set to the cross-sectional position is acquired to calculate the predicted vector. (Step S4). And the metal mold | die estimation using a shape difference is performed (step S5).

  FIG. 13 is a flowchart showing the mold expectation operation using the shape difference. In the mold prospect using the shape difference in step S5, as shown in FIG. 13, the mold shape of the molding die acquired in step S1 and the post-springback shape of the molded product acquired in step S2 are positioned. (Step S11), and the post-spring back shape 15 of the molded product is aligned with the mold shape 10 of the molding die. The mold shape of the molding die and the post-spring-back shape of the molded product are aligned using a known best fit or three-point alignment that minimizes the shape error. Then, the corresponding point of the post-spring back shape of the molded product corresponding to the evaluation point of the mold shape of the molding die is calculated (step S12).

  FIG. 14 is a flowchart showing an operation of calculating the corresponding point in the post-spring back shape of the molded product corresponding to the evaluation point in the mold shape of the molding die. In the calculation of the corresponding point of the post-spring back shape corresponding to the evaluation point of the mold shape in step S12, as shown in FIG. 14, the mold shape of the molding die and the post-spring back shape of the molded product in the predetermined section are fitted. (Step S21).

  First, for the cross-sectional position C1 acquired in step S3, the cross-sectional shape of the post-springback shape and the cross-sectional shape of the mold shape aligned in step S11 are calculated, and the cross-sectional shape of the calculated post-springback shape is calculated. The cross-sectional shape of the mold shape is fitted using a known least square method. Specifically, the cross-sectional shape of the post-springback shape is fitted to the cross-sectional shape of the mold shape, and the post-springback shape after fitting is calculated.

  Next, for the cross-sectional position C1, the closest point in the post-springback shape of the molded product after fitting, which is closest to the evaluation point of the molding die at the cross-sectional position acquired in step S4, is calculated (step S22). The closest point calculated in step 1 is returned to the post-springback shape of the molded product before fitting, and the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape is calculated (step S23).

  Then, it is determined whether or not the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape has been calculated for all the cross-sectional positions (step S24). In this embodiment, steps S21 to S24 are repeated until the corresponding points of the post-springback shape corresponding to the evaluation points of the mold shape are calculated for all the cross-sectional positions of the cross-sectional positions C1 to C11.

  If the determination result in step S24 is yes (YES), that is, if the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape is calculated for all cross-sectional positions, as shown in FIG. A displacement vector from the evaluation point of the shape to the corresponding point of the post-springback shape is calculated (Step S13), and the calculated displacement vector is multiplied by a correction coefficient α of α = −1 to be expected at the evaluation point of the mold shape. A vector is calculated (step S14). Expectation vectors for calculating springback at all evaluation points set in the mold shape are calculated. The corresponding points of the post-springback shape corresponding to the calculated evaluation points of the mold shape are recorded in the corresponding point calculation result data file, and the calculated expected vectors are recorded in the expected vector calculation result data file.

  Based on the expectation vector at the evaluation point of the die shape calculated in step S14, the die expectation for the spring back of the molded product is performed (step S15). An analysis model is created by dividing the mold shape of the molding die acquired in step S1 into finite elements, and a prospective vector at the evaluation point of the mold shape calculated in step S14 is mapped to the analysis model of the mold shape. Then, a prospective vector is given as a forced displacement to the analysis model of the mold shape, and the mold shape is deformed by using the finite element method to calculate a prospective mold shape that anticipates the spring back of the molded product.

  The analysis model created by dividing the mold shape of the molding die into finite elements is provided with a plurality of nodes constituting the mold shape, and as described above, the analysis model of the mold shape includes the mold shape. If the evaluation point set in the mold shape is not set on the node of the analysis model when the prediction vector at the evaluation point is mapped, the prediction vector at the evaluation point is assigned to the node closest to the evaluation point. The expected mold shape is calculated using the finite element method.

  In step S15, a mold expectation that anticipates springback is performed, and when a prospective mold shape that anticipates springback is calculated, generation of the mold shape that anticipates the springback of the molded product is terminated. The calculated expected mold shape is recorded in a mold expected calculation result data file.

  In this embodiment, after calculating the displacement vector from the evaluation point of the mold shape to the corresponding point of the post-springback shape, the displacement vector is multiplied by a correction coefficient α of α = −1 at the evaluation point of the mold shape. Although the likelihood vector is calculated, it is also possible to set the correction coefficient α where α <0 as appropriate. For example, the expected amount can be adjusted by setting a correction coefficient α such as α = −1.2.

  Thus, according to this embodiment, after aligning the mold shape of the molding die and the post-spring back shape of the molded product, the cross-sectional shape of the post-spring back shape is a cross section of the mold shape for each cross section. The closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape is calculated, and the closest point is returned to the cross-sectional shape before fitting of the post-springback shape. Then, it is calculated as a corresponding point of the post-spring back shape corresponding to the evaluation point of the mold shape.

  Then, a displacement vector from the evaluation point of the mold shape to the corresponding point of the post-spring back shape is calculated, and a prospect vector at the evaluation point of the mold shape is calculated by multiplying the displacement vector by a coefficient α with α <0. Map the expected vector at the evaluation point of the mold shape to the analysis model of the mold shape of the molding die, give the expected vector as the forced displacement to the analysis model of the mold shape, and use the finite element method As a result, the expected mold shape is calculated in consideration of the spring back of the molded product.

  As a result, even when the spring back is large after press molding and deformation due to torsion or warping is large, the mold shape of the molding die used for generating the mold shape of the molding die in anticipation of the spring back of the molded product Corresponding points with the shape after the spring back of the molded product can be calculated with high accuracy, and the mold shape of the molding die that anticipates the spring back of the molded product can be generated with high accuracy.

  Further, in the present embodiment, the shape data created based on the position data obtained by actually measuring the shape after the spring back of the molded product molded using the molding die is used, so that the molding that anticipates the spring back of the molded product is used. The mold shape of the mold can be generated with high accuracy.

  In the present embodiment, the post-springback shape 15 of the molded product uses shape data created based on position data obtained by actually measuring the post-springback shape of the molded product actually press-molded using a molding die. It is also possible to use the shape data of the post-spring shape of the molded product calculated by simulating the molding of the metal plate by the molding die using a known finite element method.

  In this way, by using the shape data of the shape after the spring back of the molded product calculated using the finite element method, the spring back of the molded product can be reduced without the need for actual press molding using a molding die. The mold shape of the expected mold can be generated.

  Here, a specific example of corresponding points between the mold shape of the molding die calculated using the mold shape generation system according to the present embodiment and the post-spring back shape of the molded product will be described.

  FIG. 15 is a diagram illustrating an example of corresponding points between the mold shape of the molding die calculated using the mold shape generation system according to the present embodiment and the post-springback shape of the molded product. In FIG. 15, with respect to the mold shape L111 and the post-springback shape L112 shown in FIG. 18 described above, the corresponding points between the mold shape L111 and the springback shape L112 are obtained using the mold shape generation system according to the present embodiment. The calculated case is shown, and the evaluation point of the mold shape L111 and the corresponding point of the post-springback shape L112 corresponding to the evaluation point are displayed using black circle marks and black square marks, respectively, and the correspondence from the evaluation points The displacement vector to the point is indicated by an arrow.

  As can be seen from FIG. 15, even when deformation due to torsion is large, in the mold shape generation system according to the present embodiment, the displacement vector from the evaluation point of the mold shape L111 to the corresponding point of the post-springback shape L112 intersects. Therefore, the corresponding points between the mold shape L111 and the post-springback shape L112 can be calculated with high accuracy.

  FIG. 16 is a diagram illustrating another example of corresponding points between the mold shape of the molding die calculated using the mold shape generation system according to the present embodiment and the post-springback shape of the molded product. In FIG. 16, with respect to the mold shape L121 and the post-springback shape L122 shown in FIG. 19, the corresponding points of the mold shape L121 and the springback shape L122 are obtained using the mold shape generation system according to this embodiment. The calculated case is shown, and the evaluation point of the mold shape L121 and the corresponding point of the post-springback shape L122 corresponding to the evaluation point are displayed using a black circle mark and a black square mark, respectively. A displacement vector to the corresponding point is indicated by an arrow.

  As can be seen from FIG. 16, even in the case where deformation due to warpage in the longitudinal direction is large, in the mold shape generation system according to this embodiment, the displacement from the evaluation point of the mold shape L121 to the corresponding point of the post-springback shape L122. Corresponding points between the mold shape L121 and the post-springback shape L122 can be accurately calculated without intersecting the vectors.

  Thus, in this embodiment, the cross-sectional shape of the post-springback shape is fitted to the cross-sectional shape of the mold shape, and the closest point after the fitting of the post-springback shape closest to the evaluation point of the mold shape is calculated, By returning this nearest point to the post-springback shape before fitting and calculating it as a corresponding point, the corresponding point between the mold shape of the molding die and the post-springback shape of the molded product can be accurately calculated, It is possible to accurately generate a mold shape of a molding mold that anticipates springback.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the present invention, the corresponding point between the mold shape of the molding die and the shape after the spring back of the molded product can be calculated with high accuracy, and the mold of the molding die that allows for the spring back of the molded product. There is a possibility of being suitably used when generating a shape.

20 Computer 21 Central processing unit 22 Input device 23 Display device 24 Storage device 25 Output device

Claims (8)

When generating the mold shape of a molding die in anticipation of the springback of the molded product, after the moldback according to the target shape of the molded product and the molded product press-molded using the molding die A corresponding point calculation system for calculating corresponding points with a shape,
Cross-section position acquisition means for acquiring a cross-section position set in the mold shape;
Evaluation point acquisition means for acquiring an evaluation point at the cross-sectional position;
Alignment means for aligning the mold shape and the post-springback shape;
Fitting means for fitting the cross-sectional shape of the post-springback shape aligned by the alignment means to the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means;
The closest point calculation means for calculating the closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means When,
Corresponding to return the closest point calculated by the closest point calculating means to the cross-sectional shape before fitting of the post-springback shape, and to calculate the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape Point calculating means;
The corresponding point calculation system characterized by having. A mold shape generation system for generating a mold shape of a mold in anticipation of a springback of a molded product,
Mold shape data acquisition means for acquiring the shape data of the mold shape of the molding die according to the target shape of the molded product,
Molded product shape data obtaining means for obtaining shape data of a shape after springback of a molded product press-molded using the molding die;
Cross-section position acquisition means for acquiring a cross-section position set in the mold shape;
Evaluation point acquisition means for acquiring an evaluation point at the cross-sectional position;
Alignment means for aligning the mold shape acquired by the mold shape data acquisition means and the post-springback shape acquired by the molded product shape data acquisition means;
Fitting means for fitting the cross-sectional shape of the post-springback shape aligned by the alignment means to the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means;
The closest point calculation means for calculating the closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means When,
Corresponding to return the closest point calculated by the closest point calculating means to the cross-sectional shape before fitting of the post-springback shape, and to calculate the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape Point calculating means;
Displacement vector calculation means for calculating a displacement vector from the evaluation point of the mold shape to the corresponding point of the post-springback shape calculated by the corresponding point calculation means;
Expectation vector calculation means for calculating the expectation vector for estimating the spring back of the molded product at the evaluation point of the mold shape by multiplying the displacement vector calculated by the displacement vector calculation means by a coefficient α satisfying α <0. When,
The expectation vector at the evaluation point of the mold shape calculated by the expectation vector calculation means is mapped to the analysis model of the mold shape of the molding die, and the expectation vector is set as the forced displacement in the analysis model of the mold shape. Given, deforming the mold shape using the finite element method, the expected mold shape calculating means for calculating the expected mold shape in anticipation of the spring back of the molded product,
A mold shape generation system characterized by comprising: The molded product shape data acquisition means acquires shape data created based on position data obtained by measuring the post-springback shape of a molded product molded using a molding die.
The mold shape generation system according to claim 2, wherein: The molded product shape data acquisition means acquires the shape data of the post-springback shape of the molded product calculated using a finite element method.
The mold shape generation system according to claim 2, wherein: When generating the mold shape of a molding die in anticipation of the springback of the molded product, after the moldback according to the target shape of the molded product and the molded product press-molded using the molding die A corresponding point calculation program for calculating corresponding points with a shape,
Computer
Cross-sectional position acquisition means for acquiring the cross-sectional position set in the mold shape;
Evaluation point acquisition means for acquiring an evaluation point at the cross-sectional position,
An alignment means for aligning the mold shape and the post-springback shape;
Fitting means for fitting the cross-sectional shape of the post-springback shape aligned by the alignment means to the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means;
The closest point calculation means for calculating the closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means ,as well as,
Corresponding to return the closest point calculated by the closest point calculating means to the cross-sectional shape before fitting of the post-springback shape, and to calculate the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape Function as point calculation means,
Corresponding point calculation program characterized by that. A mold shape generation program for generating a mold shape of a molding mold in anticipation of a springback of a molded product,
Computer
Mold shape data acquisition means for acquiring the shape data of the mold shape of the molding die according to the target shape of the molded product,
Molded product shape data acquisition means for acquiring shape data of a shape after springback of a molded product press-molded using the molding die,
Cross-sectional position acquisition means for acquiring the cross-sectional position set in the mold shape;
Evaluation point acquisition means for acquiring an evaluation point at the cross-sectional position,
Alignment means for aligning the mold shape acquired by the mold shape data acquisition means and the post-springback shape acquired by the molded product shape data acquisition means;
Fitting means for fitting the cross-sectional shape of the post-springback shape aligned by the alignment means to the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means;
The closest point calculation means for calculating the closest point in the cross-sectional shape after fitting of the post-springback shape closest to the evaluation point in the cross-sectional shape of the mold shape for each cross-section of the cross-sectional position acquired by the cross-sectional position acquisition means ,
Corresponding to return the closest point calculated by the closest point calculating means to the cross-sectional shape before fitting of the post-springback shape, and to calculate the corresponding point of the post-springback shape corresponding to the evaluation point of the mold shape Point calculation means,
A displacement vector calculating means for calculating a displacement vector from the evaluation point of the mold shape to the corresponding point of the post-springback shape calculated by the corresponding point calculating means;
Expectation vector calculation means for calculating the expectation vector for estimating the spring back of the molded product at the evaluation point of the mold shape by multiplying the displacement vector calculated by the displacement vector calculation means by a coefficient α satisfying α <0. ,as well as,
The expectation vector at the evaluation point of the mold shape calculated by the expectation vector calculation means is mapped to the analysis model of the mold shape of the molding die, and the expectation vector is set as the forced displacement in the analysis model of the mold shape. Given, by deforming the mold shape using the finite element method, to function as an expected mold shape calculating means for calculating the expected mold shape that anticipates the spring back of the molded product,
A mold shape generation program characterized by that. Computer
When functioning as the molded product shape data acquisition means, to function to acquire the shape data created based on the position data obtained by measuring the post-springback shape of the molded product molded using the molding die,
The mold shape generation program according to claim 6. Computer
When functioning as the molded product shape data acquisition means, to function to acquire the shape data of the post-spring shape of the molded product calculated using a finite element method,
The mold shape generation program according to claim 6.

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