Mold and shaping method

Abstract

To provide a form block and a shaping method that hardly cause wrinkles on a laminate on a placing surface when shaping the laminate into a kink shape.SOLUTION: A form block comprises a kink surface 110 and a placing surface 120. The kink surface 110 bends so as to protrude toward a depth direction Dd with a kink line 118 as a boundary, the kink line extending in a height direction Dh that connects between an upper end point 118a and a lower end point 118b. A normal direction of the placing surface 120 approximately coincides with the height direction Dh, and the placing surface has a folding line 121 extending in a width direction Dw. The upper end point 118a is positioned between a first intersection point 121c and a second intersection point 121d, and the lower end point 118b in the height direction Dh. The folding line 124 being the folding line 121 between the first intersection point 121c and the second intersection point 121d convexly protrudes toward the kink line 118 in the depth direction Dd.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to molds and shaping methods. [Background technology]

[0002] BACKGROUND ART Some aircraft parts, such as fuselages and main wings, use composite materials, such as carbon fiber reinforced plastics (CFRP). CFRP structural members (composite structures) that make up aircraft parts have any cross-sectional shape. One method for manufacturing such composite structures is to laminate multiple fiber sheets (prepreg, etc.) to create a flat fiber sheet laminate (also called a "charge"), and then use a molding die to shape this laminate to give it any shape.

[0003] One such shape is a kink shape, which is a shape that includes a first surface having a bent shape (kink) and a second surface that intersects with the first surface. Furthermore, the forming die used to form the laminate into a kink shape has a kink surface having a bent shape and a mounting surface intersecting the kink surface.

[0004] When the laminate is formed using the mold, if the laminate placed on the kink surface of the mold is bent toward the mounting surface of the mold, the laminate is compressed on the mounting surface, causing distortion and wrinkles in the laminate, which is undesirable because it significantly reduces the strength of the part.

[0005] As a molding die for forming a laminate into a substantially uniform shape, for example, there is a molding die disclosed in Patent Document 1. Furthermore, although it is not a mold for forming a kink shape, for example, there is a mold disclosed in Patent Document 2. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent No. 8,795,567 [Patent Document 2] Patent No. 4773713 Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Document 1, a protrusion is provided in advance on the surface of the mold corresponding to the first surface, and the laminate placed on the surface of the mold corresponding to the second surface is bent toward the surface of the mold corresponding to the first surface. However, depending on the ratio of the length dimension of the first surface to the length dimension of the second surface, this shaping method using a mold may be theoretically possible but not practical. For example, if the dimensions of the first surface are sufficiently large relative to the dimensions of the second surface, and an attempt is made to shaping the laminate superposed on the surface of the mold corresponding to the second surface by bending it toward the surface of the mold corresponding to the first surface, the deformation caused by the bending will affect a wide area of ​​the entire surface corresponding to the first surface, increasing the risk of wrinkles.

[0008] Furthermore, although Patent Document 2 can prevent wrinkles caused by excess fiber, it is not possible to provide the molding die with a flat surface for forming a flat interface in the laminate that comes into contact with other parts.

[0009] The present disclosure has been made in consideration of these circumstances, and aims to provide a molding die and a shaping method that make it less likely for wrinkles to form in the laminate on the supporting surface when shaping the laminate into a kink shape. [Means for solving the problem]

[0010] In order to solve the above problems, the molding die and shaping method of the present disclosure employ the following means. That is, a forming die according to one aspect of the present disclosure is a forming die for folding a laminate in which a plurality of fiber sheets are stacked, and includes a kink surface on which the laminate is superposed, and a placement surface that intersects with the kink surface and on which the laminate superposed on the kink surface is placed by folding, the kink surface is bent so as to protrude in a second direction perpendicular to the first direction, with a kink line extending along a first direction connecting a first kink point and a second kink point as a boundary, the placement surface has a normal direction that is substantially the same as the first direction and a folding line that extends in a third direction perpendicular to the first direction and the second direction, The kink surface has a first boundary line connecting a first intersection on the bending line and the first kink point, and a second boundary line connecting a second intersection on the bending line and the first kink point, the first intersection point is located closer to one end of the bending line than the first kink point in the third direction, the second intersection point is located closer to the other end of the bending line than the first kink point in the third direction, the first kink point is located between the first intersection point and the second intersection point and the second kink point in the first direction, and the bending line between the first intersection point and the second intersection point protrudes convexly toward the kink line in the second direction.

[0011] Furthermore, a shaping method according to one aspect of the present disclosure is a shaping method for shaping the laminate using the above-mentioned mold, and includes the steps of overlapping the laminate on the kink surface and folding the laminate overlapped on the kink surface along the folding line toward the placement surface. [Effects of the Invention]

[0012] According to the present disclosure, wrinkles are less likely to occur in the laminate on the placement surface when the laminate is shaped into a kink shape. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a mold according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a perspective view of a mold according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is a front view of a molding die according to an embodiment of the present disclosure. [Figure 4] FIG. 2 is a plan view of a molding die according to an embodiment of the present disclosure. [Figure 5] FIG. 1 is a perspective view of a mold according to an embodiment of the present disclosure. [Figure 6] 1A to 1C are cross-sectional views at various height positions of a molding die according to an embodiment of the present disclosure. [Figure 7] FIG. 2 is a plan view of a molding die according to an embodiment of the present disclosure. [Figure 8] FIG. 1 is a perspective view showing a shaping method according to one embodiment of the present disclosure. [Figure 9] 10 is a graph showing the relationship between the position s and the angle θ and the relationship between the position s and the rate of change dθ / ds of the angle. [Figure 10] FIG. 1 is a perspective view showing the state after shaping according to Comparative Example 1. [Figure 11] 10 is a graph showing the relationship between the position s and the angle θ and the relationship between the position s and the rate of change dθ / ds of the angle (Comparative Example 1). [Figure 12] FIG. 10 is a perspective view showing the state after shaping according to Comparative Example 2. [Figure 13] 10 is a graph showing the relationship between the position s and the angle θ and the relationship between the position s and the rate of change dθ / ds of the angle (Comparative Example 2). DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, one embodiment of the molding die and shaping method according to the present disclosure will be described with reference to the drawings. In the following explanation, the terms height direction Dh (first direction), depth direction Dd (second direction), and width direction Dw (third direction), as well as the terms up and down, are used for convenience of explanation and do not necessarily limit the actual position of an object. Here, the height direction Dh, the depth direction Dd, and the width direction Dw are perpendicular to one another.

[0015] [About the molding die] The mold 100 is used to form a layered body 200 (charge) formed by laminating a plurality of fiber sheets into a kink shape.

[0016] The fiber sheet is composed of, for example, a fiber base material whose fiber direction is aligned parallel to the longitudinal direction of the fiber sheet, and a resin impregnated into the fiber base material. The fiber base material may be, for example, carbon fiber or glass fiber. The resin impregnated into the fiber substrate may be a thermosetting resin that hardens when heated, such as epoxy resin, polyimide, polyurethane, unsaturated polyester, etc. Alternatively, a thermoplastic resin that hardens when heated, such as polyamide, polyethylene, polystyrene, or polyvinyl chloride, may be used.

[0017] As shown in FIGS. 1 to 4, the mold 100 is a mold having a kink surface 110, a mounting surface 120, and a transition surface .

[0018] The kink surface 110 is a curved surface having a first kink surface 111 (the surface on the left side in FIG. 3) and a second kink surface 112 (the surface on the right side in FIG. 3), and is curved so that the position in the depth direction Dd changes along the width direction Dw. The first kink surface 111 and the second kink surface 112 are each a flat surface, and the boundary between these two surfaces is defined by a kink line 118. Here, the kink line 118 is a line (ridge line) that connects an upper end point 118a (first kink point) and a lower end point 118b (second kink point) and extends along the height direction Dh. That is, the kink surface 110 is a curved surface in which a flat first kink surface 111 and a flat second kink surface 112 are connected with a kink line 118 extending along the height direction Dh as a boundary line, and which is bent so as to protrude in the depth direction Dd (toward the viewer in FIG. 1) with the kink line 118 extending along the height direction Dh as a ridge line.

[0019] The upper side of the first kink surface 111 has a first boundary line 113 and a first top line 115. Similarly, the upper side of the second kink surface 112 has a second boundary line 114 and a second top line . The first boundary line 113 and the second boundary line 114 are each lines (ridge lines) connected to the upper end point 118a of the kink line 118, and are bifurcated lines that separate from each other in the width direction Dw as they move upward from the upper end point 118a in the height direction Dh. The first upper end line 115 is a straight line (ridge line) connected to the first boundary line 113 and extends in the width direction Dw. Similarly, the second upper end line 116 is a straight line (ridge line) connected to the second boundary line 114 and extends in the width direction Dw.

[0020] The placement surface 120 is a flat surface that intersects with the kink surface 110, and the normal direction of the placement surface 120 is substantially the same as the height direction Dh. The side of the placing surface 120 that is in contact with / adjacent to the kink surface 110 (the side on the near side in FIG. 1) is defined as a folding line 121. The folding line 121 is a line (ridge line) that connects the first end 121a (the end on the left side in FIG. 3) and the second end 121b (the end on the right side in FIG. 3) and extends in the width direction Dw. The folding line 121 as a whole protrudes convexly in the depth direction Dd (toward the viewer in FIG. 1). The bending line 121 is located higher in the height direction Dh than the upper end point 118a of the kink line 118. That is, the upper end point 118a is located between the bending line 121 and the lower end point 118b in the height direction Dh. In this case, the dimension along the height direction Dh from the bending line 121 to the upper end point 118a of the kink line 118 is defined as height h (see FIG. 5).

[0021] Such a folding line 121 includes a folding straight line 122, a folding straight line 123, and a folding convex line .

[0022] The bending line 122 is a portion of the straight bending line 121 that includes the first end 121a, and coincides with the first upper end line 115 of the first kink surface 111. That is, the bending line 122 and the first upper end line 115 are the same straight line. Therefore, the bending line 122 is also connected to the first boundary line 113. Here, the boundary point (connection point) between the bending line 122 and the first boundary line 113 is defined as a first intersection point 121c. The first intersection point 121c is located closer to the first end 121a than the upper end point 118a in the width direction Dw.

[0023] The bending line 123 is a portion of the straight bending line 121 that includes the second end 121b, and coincides with the second upper end line 116 of the second kink surface 112. In other words, the bending line 123 and the second upper end line 116 are the same straight line. Therefore, the bending line 123 is also connected to the second boundary line 114. Here, the boundary point (connection point) between the bending line 123 and the second boundary line 114 is defined as a second intersection point 121d. The second intersection point 121d is located closer to the second end 121b than the upper end point 118a in the width direction Dw.

[0024] The bend convex line 124 is the portion of the bend line 121 between the first intersection 121c and the second intersection 121d. The bent convex line 124 is a curved line that protrudes convexly in the depth direction Dd (toward the viewer in FIG. 1). The curved line is preferably a continuous, smooth line, but may be discontinuous (for example, stepped) from a microscopic perspective. The curved line has a predetermined radius of curvature, for example, a circular arc with a radius Rf (see FIG. 5).

[0025] The transition surface 130 is a curved surface bounded by the bending convex line 124 , the first boundary line 113 and the second boundary line 114 . That is, the transition surface 130 is a curved surface having a substantially triangular shape that is connected to the placement surface 120, the first kink surface 111, and the second kink surface 112.

[0026] FIG. 6 shows horizontal cross sections (cross sections cut along a plane extending in the depth direction Dd and width direction Dw) of forming mold 100 at different positions H1, H2, H3 in the height direction Dh. 6, transition surface 130 is a curved surface configured such that the length (perimeter) of the curve that follows the shape of bent convex line 124 gradually decreases as it approaches upper end point 118a of kink line 118. The lowest point of transition surface 130 coincides with upper end point 118a of kink line 118. It is preferable that the circumferential length be gradually changed. Therefore, it is preferable that the first boundary line 113 and the second boundary line 114 are smooth curves. Specifically, as shown in Fig. 3, it is preferable that the first boundary line 113 is a smooth curve that protrudes convexly toward the second end 121b, and it is preferable that the second boundary line 114 is a smooth curve that protrudes convexly toward the first end 121a.

[0027] [Determining the shape] 5, the dimension along the height direction Dh from the bending line 121 to the upper end point 118a of the kink line 118 is defined as height h. In addition, the bending convex line 124 is, for example, an arc having a radius Rf. The method for determining the height h and radius Rf will be described below.

[0028] The height h and radius Rf are determined based on the "allowable value of dθ / ds" which depends on the material properties of the laminate 200 and the fiber sheet (type of fiber base material, type of resin, density of the fiber base materials, etc.).

[0029] First, dθ / ds will be explained. 7, when considering a line S that starts at first end 121a and extends along bending line 121 toward second end 121b, dθ / ds is the rate of change in the angle of the normal (normal to bending line 121) when moving the infinitesimal distance ds from position s1 to position s2. In other words, dθ / ds is the ratio of the change in angle dθ between the angle of normal line Ns1 at position s1 and the angle of normal line Ns2 at position s2, relative to the infinitesimal distance ds. Note that Ts1 shown in FIG. 7 is a tangent to the bending line 121 at the position s1, and Ts2 is a tangent to the bending line 121 at the position s2. Furthermore, since the bending line 121 from the first end 121a to the first intersection 121c (i.e., bending straight line 122) and the bending line 121 from the second intersection 121d to the second end 121b (i.e., bending straight line 123) are straight lines, dθ / ds = 0 (zero), and the bending line 121 from the first intersection 121c to the second intersection 121d (i.e., bending convex line 124) is a curve (e.g., a circular arc), |dθ / ds| > 0. Moreover, the angle α is obtained by integrating the change dθ in the angle from the first intersection 121c to the second intersection 121d at the position s.

[0030] Based on the above, the "acceptable value of dθ / ds" is the limit value of the rate of change of angle at which, taking into account the compressive stress acting locally on the fiber sheet when the rate of change of angle is dθ / ds and the relaxation of the compressive stress due to shear deformation of the fiber sheet, even when these compressive stresses and shear deformations act, no wrinkles appear on the appearance of the laminate 200 or the fiber sheet, and no shift occurs between the fiber sheets in the laminate 200. For example, if the rate of change of angle is within the allowable value of dθ / ds, even if a local compressive force acts on the laminate 200 or the fiber sheet, the resin between the fiber base materials will only be compressed to the extent that wrinkles will not occur. The shear deformation is applied to relax the compressive stress acting on the fiber sheet by stretching the compressed fiber sheet in the width direction Dw.

[0031] <About the radius Rf> 5, when a position distance lf from first intersection 121c along the normal line to first intersection 121c (normal line to bending line 121) is defined as point C, and a position distance lf from second intersection 121d along the normal line to second intersection 121d (normal line to bending line 121) is defined as point D, the length of the curved line approximately parallel to bending line 121 from point C to point D is defined as L3. The distance lf will be described later. In this case, the difference between L2 and L3 is expressed by the following formula 1.

[0032]

number

[0033] Furthermore, dθ / ds is expressed by the following Equation 2 based on Equation 1.

[0034]

number

[0035] Since dθ / ds is determined by the material properties and the angle α is determined by the angle between the first kink surface 111 and the second kink surface 112, the radius Rf can be determined according to the tolerance of dθ / ds using Equation 2.

[0036] <About height h> 5, when the intersection point between a line extending downward from first intersection 121c along the height direction Dh and the lower edge of first kink surface 111 is defined as point A, and the intersection point between a line extending downward from second intersection 121d along the height direction Dh and the lower edge of second kink surface 112 is defined as point B, the length of the lower edge (bent line) of kink surface 110 from point A to point B is defined as L1. Furthermore, the length of bend line 121 from first intersection 121c to second intersection 121d (i.e., the length of bent convex line 124) is defined as L2. In this case, the difference between L1 and L2 is expressed by the following formula 3.

[0037]

number

[0038] Here, angle α is the angle between the normal at the first intersection 121c (the normal to the bending line 121) and the normal at the second intersection 121d (the normal to the bending line 121), and depends on the angle between the first kink surface 111 and the second kink surface 112.

[0039] Furthermore, dθ / ds is expressed by the following Equation 4 based on Equation 3.

[0040]

number

[0041] Since dθ / ds is determined by the material properties and the angle α is determined by the angle between the first kink surface 111 and the second kink surface 112, the height h can be determined according to the tolerance of dθ / ds using Equation 4.

[0042] [About the excipient method] As shown in FIG. 8, first, the laminate 200 is placed on the kink surface 110 . When the laminate 200 is placed on the kink surface 110, the laminate 200 is bent along the kink surface 110, and a kink line portion 230 extending along the kink line 118 provided on the kink surface 110 is formed in the laminate 200. At this time, the portion of the laminate 200 that is in surface contact with the kink surface 110 is defined as a first portion 201, and the portion of the laminate 200 that protrudes upward from the kink surface 110 is defined as a second portion 202. The dimension of the second portion 202 along the height direction Dh is the distance lf.

[0043] Next, the second portion 202 of the laminate 200 is folded along the folding line 121 toward the placement surface 120 and placed on the placement surface 120 .

[0044] In the process of folding the second portion 202 toward the placement surface 120, both sides of the second portion 202 move toward the center, and the laminate 200 (fiber sheet) corresponding to the second portion 202 is compressed in the width direction Dw, causing strain.

[0045] 9, the angle θ of the normal line on the bending line 121 changes continuously and gradually from the first intersection 121c to the second intersection 121d, so the rate of change of the angle dθ / ds is maintained at a value equal to or less than the allowable value from the first intersection 121c to the second intersection 121d. In other words, because there is a range between the first intersection 121c and the second intersection 121d, the change in the angle θ of the normal line required to impart a kink shape to the laminate 200 is dispersed within that range, thereby reducing the rate of change of the angle dθ / ds overall. This distributes the total strain amount in the width direction Dw that should occur in the laminate 200 (fiber sheet) corresponding to the second portion 202 over the range between the first intersection 121c and the second intersection 121d, thereby preventing the total strain amount from concentrating locally and making the laminate 200 (fiber sheet) less susceptible to wrinkles.

[0046] Note that the graph shown in FIG. 9 assumes that the bent convex line 124 is an arc having a radius Rf, and therefore the rate of change of the angle dθ / ds is constant in the range between the first intersection 121c and the second intersection 121d. However, as long as the rate of change of the angle dθ / ds is within the allowable value within the same range, the rate of change of the angle dθ / ds does not necessarily have to be constant. In other words, the radius of curvature of the bent convex line 124 may be changed within the same range.

[0047] <Comparative Example> If a molding die 300 such as that shown in Figure 10 (which does not have the first boundary line 113, second boundary line 114, and bending convex line 124 of molding die 100) is used, the change in the normal angle θ required to impart a kink shape to laminate 200 will be concentrated at vertex 301. 11, the rate of change of angle dθ / ds peaks near vertex 301 and greatly exceeds the allowable value. As a result, the total strain amount is concentrated locally, causing wrinkles 250 to occur in the laminate 200 (fiber sheet).

[0048] <Comparative Example 2> If a molding die 400 such as that shown in Figure 12 (in which the first boundary line 113, the second boundary line 114, and the bending convex line 124 of the molding die 100 are all straight lines) is used, the change in the angle θ of the normal required to impart a kink shape to the laminate 200 will be concentrated at vertices 401 and 402. 13, the rate of change of angle dθ / ds peaks near vertices 401 and 402. Although the values ​​of the peaks are lower than those in Comparative Example 1, they still exceed the allowable values. As a result, the total strain is concentrated locally, causing wrinkles 250 to form in the laminate 200 (fiber sheet).

[0049] This embodiment has the following advantages. Since the folding line 121 between the first intersection 121c and the second intersection 121d protrudes convexly toward the kink line 118 in the depth direction Dd, when the laminate 200 superimposed on the kink surface 110 is folded and placed on the placement surface 120, the laminate 200 is compressed in the width direction Dw on the placement surface 120, and the total strain amount that should occur in the laminate 200 is dispersed over a wide range of the folding line 121 between the first intersection 121c and the second intersection 121d (a wider range than when the folding line is bent at least at one point (vertex 301) or two points (vertices 401 and 402)). This prevents the total strain amount from concentrating locally, making it less likely for wrinkles to occur in the laminate 200 on the placement surface 120. Furthermore, when the bending line 121 between the first intersection 121c and the second intersection 121d is a smooth curve, the rate of change dθ / ds of the angle with respect to the minute distance ds on the bending line 121 between the first intersection 121c and the second intersection 121d can be made smooth. This prevents the rate of change dθ / ds from becoming locally high, making it less likely that wrinkles will occur in the laminate on the placement surface 120.

[0050] Furthermore, since the kink surface 110 is bent at the kink line 118 and has a first boundary line 113 and a second boundary line 114, a flat surface is secured on the kink surface 110 for forming a flat interface in the laminate 200 with which other components come into contact, while a convexly protruding area (convex bend line 124) as described above can be provided on the bend line 121.

[0051] Furthermore, when the first boundary line 113 is a smooth curve that protrudes convexly toward the second intersection 121d, and the second boundary line 114 is a smooth curve that protrudes convexly toward the first intersection 121c, it is possible to smooth the rate of change of the distance from the first boundary line 113 to the second boundary line 114 in the height direction Dh, that is, the rate of change of the perimeter in the height direction Dh at the transition surface 130. This prevents the rate of change from becoming locally high, making it less likely that wrinkles will occur in the laminate 200 on the transition surface 130.

[0052] The present embodiment described above can be understood, for example, as follows. That is, the forming die (100) according to the first aspect of the present disclosure is a forming die for bending a laminate (200) in which a plurality of fiber sheets are stacked, and includes a kink surface (110) on which the laminate is superposed, and a placement surface (120) that intersects with the kink surface and on which the laminate superposed on the kink surface is placed by being folded, the kink surface is bent so as to protrude in a second direction (Dd) perpendicular to a first direction (Dh) connecting a first kink point (118a) and a second kink point (118b) at a kink line 118 that extends along the first direction (Dh), and the placement surface has a normal direction that is approximately the same as the first direction and extends in a third direction (Dw) perpendicular to the first direction and the second direction. The bend surface has a bend line (121), and the kink surface has a first boundary line (113) connecting a first intersection (121c) on the bend line to the first kink point, and a second boundary line (114) connecting a second intersection (121d) on the bend line to the first kink point, the first intersection being located closer to one end (121a) of the bend line than the first kink point in the third direction, the second intersection being located closer to the other end (121b) of the bend line than the first kink point in the third direction, the first kink point being located between the first intersection and the second intersection and the second kink point in the first direction, and the bend line between the first intersection and the second intersection protrudes convexly toward the kink line in the second direction.

[0053] According to the forming mold of this embodiment, the fold line between the first intersection and the second intersection protrudes convexly in the second direction toward the kink line, so that when the laminate overlapped on the kink surface is folded and placed on the support surface, the laminate is compressed in the third direction on the support surface, and the total strain that should occur in the laminate is distributed over a wide range of the fold line between the first intersection and the second intersection (at least a wider range than when the fold line is bent at one or two points). This prevents the total strain from concentrating locally, making it less likely for wrinkles to occur in the laminate on the support surface. Furthermore, since the kink surface is bent at the kink line and has a first boundary line and a second boundary line, it is possible to provide a flat surface on the kink surface to form a flat interface on the laminate that other components can contact, while also providing the above-mentioned convex protruding range on the bend line.

[0054] In addition, in the molding die according to the second aspect of the present disclosure, in the first aspect, the bending line between the first intersection point and the second intersection point is a smooth curve that protrudes convexly toward the kink line.

[0055] According to the forming mold of this aspect, the bending line between the first intersection point and the second intersection point is a smooth curve that protrudes convexly toward the kink line, so that the rate of change of the angle with respect to the small distance on the bending line between the first intersection point and the second intersection point can be made smooth, thereby preventing the rate of change from becoming locally high and making it difficult for wrinkles to occur in the laminate on the mounting surface.

[0056] In addition, in the forming die according to a third aspect of the present disclosure, in the second aspect, the bending line between the first intersection point and the second intersection point is an arc.

[0057] In the molding die according to this aspect, the bending line between the first intersection point and the second intersection point is an arc, so the rate of change of the angle with respect to the small distance on the bending line between the first intersection point and the second intersection point can be kept constant, which prevents the rate of change from becoming locally high, making it less likely for wrinkles to form in the laminate on the mounting surface.

[0058] Furthermore, in the molding die according to a fourth aspect of the present disclosure, in any of the first to third aspects, the first boundary line is a smooth curve that convexly protrudes toward the second intersection point, and the second boundary line is a smooth curve that convexly protrudes toward the first intersection point.

[0059] According to the forming mold of this embodiment, the first boundary line is a smooth curve that protrudes convexly toward the second intersection point, and the second boundary line is a smooth curve that protrudes convexly toward the first intersection point, so that the rate of change of the distance from the first boundary line to the second boundary line in the first direction, i.e., the rate of change of the perimeter in the first direction at the surface enclosed by the three lines of the bend line, the first boundary line, and the second boundary line (hereinafter referred to as the "transition surface"), can be made smooth. As a result, the rate of change is prevented from becoming locally high, and wrinkles are less likely to occur in the laminate on the transition surface.

[0060] In addition, a shaping method according to a fifth aspect of the present disclosure is a shaping method for shaping the laminate using a molding die described in any one of the first to fourth aspects, and includes the steps of overlapping the laminate on the kink surface and folding the laminate overlapped on the kink surface along the folding line toward the placement surface. [Explanation of symbols]

[0061] 100 molds 110 Kink Surface 111 First kink surface 112 Second kink surface 113 First Boundary 114 Second Boundary 115 1st top line 116 2nd top line 118 Kink 118a Upper end point (1st kink point) 118b Lower end point (second kink point) 120 Placement surface 121 Bending line 121a First end 121b Second end 121c 1st intersection 121d 2nd intersection 122 bending line (first end portion to first intersection bending line 121) 123 Bending line (2nd intersection ~ 2nd end bending line 121) 124 Bending convex line (bending line 121 from the first intersection to the second intersection) 130 Transition plane 200 laminate 201 First Part 202 Second Part 230 Kinked wire section Dh Height direction (first direction) Dd Depth direction (second direction) Dw Width direction (third direction)

Claims

1. A molding die for bending a laminate in which a plurality of fiber sheets are stacked, a kink surface where the laminate is overlapped; a placement surface that intersects with the kink surface and on which the laminated body that is superposed on the kink surface is placed by being folded; Equipped with the kink surface is bent so as to protrude in a second direction perpendicular to a first direction, the second direction being a boundary of a kink line extending along a first direction connecting a first kink point and a second kink point; the placement surface has a normal direction substantially coincident with the first direction and a folding line extending in a third direction perpendicular to the first direction and the second direction, the kink surface has a first boundary line connecting a first intersection point on the bending line and the first kink point, and a second boundary line connecting a second intersection point on the bending line and the first kink point, the first intersection point is located closer to one end of the bending line than the first kink point in the third direction; the second intersection point is located closer to the other end of the bending line than the first kink point in the third direction, the first kink point is located between the first intersection point and the second intersection point and the second kink point in the first direction, The bending line between the first intersection point and the second intersection point is a curved line that protrudes convexly toward the kink line in the second direction. Molding mold.

2. The bending line between the first intersection point and the second intersection point is a smooth curve that protrudes convexly toward the kink line. The mold according to claim 1 .

3. The bending line between the first intersection point and the second intersection point is an arc. The mold according to claim 2 .

4. the first boundary line is a smooth curve that protrudes convexly toward the second intersection point, The second boundary line is a smooth curve that protrudes convexly toward the first intersection point. The mold according to claim 1 or 2.

5. A shaping method for shaping the laminate using the mold according to claim 1, overlapping the laminate on the kink surface; a step of folding the laminated body superposed on the kink surface along the folding line toward the placement surface; Contains Shaping method.

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