Pressing device and method for manufacturing a pressed shaped product

Abstract

The pressing device (1) includes: a first mold part (2) having a first processing surface (2a); a second mold part (3) having a second processing surface (3a); a first support part (4) supporting the first mold part (2); and a second support part (5) supporting the second mold part (3). At least one of the first mold parts (2) and the second mold part (3) has at least a partial gap (S1, S2) in the overlapping region (R1) where the first processing surface (2a) and the second processing surface (3a) overlap when viewed from the pressing direction. The minimum dimension of the gap (S1) in the unloaded state at the inner region (R1u) inside the centerline between the center of gravity (G) and the outer edge is smaller than the minimum dimension of the gap (S1) in the unloaded state at the outer region (R1s).

Description

Technical Field

[0001] This invention relates to a pressing device and a method for manufacturing pressed articles. Background Technology

[0002] Typically, a pressing device presses a workpiece into a shape corresponding to the shape of the die's machining surface by placing the workpiece between a pair of dies and bringing the dies close together. The dies are supported by a pair of support members capable of relative movement in the pressing direction. These support members are, for example, a slider and a pad. During pressing, a pressing load is applied to the dies from the support members. At this time, the support members may deflect due to the reaction force from the die to the support members. This deflection can affect the shape accuracy of the pressed product.

[0003] Japanese Patent Application Publication No. 2016-179486 (Patent Document 1) discloses a pressing device for suppressing deflection of a die caused by the reaction force during pressing. This pressing device includes a stiffness distribution member disposed between the die and a support member. The stiffness distribution member ensures that the stiffness of compression in the pressing direction is distributed in a predetermined manner within a plane orthogonal to the pressing direction.

[0004] In addition, Japanese Patent No. 4305645 (Patent Document 2) discloses the following: performing a plate forming simulation to determine the deflection distribution of the mold corresponding to the forming stroke.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2016-179486

[0008] Patent Document 2: Japanese Patent No. 4305645 Summary of the Invention

[0009] The problem the invention aims to solve

[0010] In the aforementioned conventional pressing devices, stiffness distribution components are required. Achieving arbitrary stiffness distribution within a single component by varying stiffness is not easy. Furthermore, methods exist to reduce deflection of the press's supports (e.g., slides and pads) by altering the structure of the supports or their bracing. These are large-scale and costly solutions, and their effectiveness is often limited.

[0011] The purpose of this disclosure is to provide a pressing apparatus and a method for manufacturing pressed articles that can reduce the effect of mold support deflection on pressing by utilizing a simple structure.

[0012] Solution for solving the problem

[0013] The pressing apparatus of the present invention is a pressing apparatus for pressing and forming a pressing object. The pressing apparatus includes: a first mold portion having a first processing surface that contacts one side of the pressing object during pressing and forming; a second mold portion having a second processing surface that contacts the other side of the pressing object during pressing and forming; a first support portion supporting the first mold portion; and a second support portion supporting the second mold portion and capable of reciprocating relative to the first support portion in the pressing direction. At least one of the first mold portion and the second mold portion has at least a partial gap in the overlapping area where the first processing surface and the second processing surface overlap when viewed from the pressing direction, where the dimension in the pressing direction under no-load conditions is uneven in two orthogonal directions when viewed from the pressing direction. The minimum dimension of the pressing direction of the gap in the unloaded state in the inner region inside the center line is smaller than the minimum dimension of the pressing direction of the gap in the unloaded state in the outer region outside the center line, where the center line is the set of midpoints of the line segment connecting the centroid of the overlapping region to any position of the outer edge of the overlapping region.

[0014] The effects of the invention

[0015] According to this disclosure, the effect of deflection of the support portion of the die in the pressing device on the pressing process can be reduced using a simple structure. Attached Figure Description

[0016] Figure 1 This is a diagram illustrating a structural example of the pressing device according to this embodiment.

[0017] Figure 2 It means Figure 1 The diagram shows the second mold section of the pressing device in the state where it is at the lower stop point.

[0018] Figure 3 This is a diagram showing a modified example of a structure that forms a gap in the mold section.

[0019] Figure 4 Viewed from the direction of suppression (above). Figure 3 The top view obtained from the first mold section shown.

[0020] Figure 5 It means Figure 4 The diagram shows the distribution of the clearance dimensions of the first mold section under no-load conditions.

[0021] Figure 6 It means Figure 4 A diagram showing the distribution of clearance dimensions at the lower stop of the first mold section.

[0022] Figure 7 This is a diagram showing another variation of the structure that forms a gap in the mold section.

[0023] Figure 8 It means Figure 7 The diagram shows the distribution of the clearance dimensions of the first mold section under no-load conditions.

[0024] Figure 9 It means Figure 7 A diagram showing the distribution of clearance dimensions at the lower stop of the first mold section.

[0025] Figure 10 It means Figure 7 A diagram of another variation of the example shown. Detailed Implementation

[0026] (Structure 1)

[0027] The pressing apparatus of the present invention is a pressing apparatus for pressing and forming a workpiece. The pressing apparatus includes: a first mold portion having a first processing surface that contacts one side of the workpiece during pressing and forming; a second mold portion having a second processing surface that contacts the other side of the workpiece during pressing and forming; a first support portion supporting the first mold portion; and a second support portion supporting the second mold portion and capable of reciprocating relative to the first support portion in the pressing direction. At least one of the first and second mold portions, in an unloaded state, has at least a partially uneven gap in the dimensional direction of the overlapping area where the first and second processing surfaces overlap when viewed from the pressing direction.

[0028] In press forming performed by a pressing device, the workpiece to be pressed is positioned between a first machining surface of a first die portion and a second machining surface of a second die portion. The first and second machining surfaces (hereinafter, they may be simply referred to as machining surfaces) have shapes corresponding to the target shape of the press-formed article. A first support portion and a second support portion are brought closer together in the pressing direction, thereby pressing the workpiece between the first and second die portions. During press forming, the first machining surface contacts one side of the workpiece to be pressed, and the second machining surface contacts the other side of the workpiece opposite to that side. The shape of the press-formed article is determined by the spatial shape (gap) between the first and second machining surfaces at the bottom dead center, i.e., when the first and second die portions are closest to each other. Furthermore, the shape of the machining surface may not necessarily be the same as the target shape of the press-formed article. For example, the amount of elastic deformation after pressing, such as springback (elastic recovery), may be considered, and a shape different from the target shape of the press-formed article may be set as the shape of the machining surface.

[0029] In the above structure 1, the pressing device, under no-load conditions, has a gap of uneven size in the pressing direction in the overlapping area of ​​at least one of the first mold part and the second mold part (hereinafter, simply referred to as the mold part) that overlaps with the processing surface when viewed from the pressing direction. During pressing, at least one of the first support part and the second support part (hereinafter, simply referred to as the support part) may deflect due to the pressing load. The mold part deforms due to the deflection of the support part. The inventors discovered that by providing the aforementioned uneven gap in the mold part under no-load conditions, the deformation of the mold part caused by the deflection of the support part during pressing can be absorbed by the uneven gap. Therefore, by providing an uneven gap in the mold part under no-load conditions as described above, the deformation of the mold part caused by the deflection of the support part during pressing can be reduced. As a result, the deformation of the processing surface of the mold part caused by the deflection of the support part can also be reduced. In this way, the influence of the deflection of the support part of the mold on pressing can be reduced using a simple structure. Effects on compression molding include, for example, defects such as cracks, wrinkles, and reduced shape accuracy of the compressed product.

[0030] Furthermore, the no-load state is a state in which no pressing load is applied to the mold part. Additionally, the gap in at least one of the first and second mold parts can be either the gap between the first mold part and the first support part, or the gap between the second mold part and the second support part, or it can be an internal gap within the first or second mold part. For example, the internal gap of the first or second mold part can be a gap between multiple components constituting the first or second mold part. Thus, the gap can be set as the gap between two adjacent components among the components constituting the mold part or the components in contact with the mold part. That is, the aforementioned gap is provided between the surface of one of the two adjacent components and the surface of the other component opposite to that surface. The two adjacent components can be either both components of the mold part, or one of them can be a component of the support part in contact with the mold part. As an example, the gap in the no-load state described above can be set as the gap between a convex surface protruding in the pressing direction of one of the two adjacent components and a plane opposite to that convex surface of the other component.

[0031] In structure 1 described above, at least one of the first and second mold portions may have a gap in the overlapping region where the first and second processing surfaces overlap when viewed from the pressing direction. This gap, in the unloaded state, has a non-uniform dimension in the pressing direction in two orthogonal directions when viewed from the pressing direction. In this case, the minimum dimension of the gap in the unloaded pressing direction at the inner region inside the centerline may be smaller than the minimum dimension of the gap in the unloaded pressing direction at the outer region outside the centerline, where the centerline is the set of midpoints of a line segment connecting the centroid of the overlapping region to any position on the outer edge of the overlapping region. This allows for a reduction in the effect of mold support deflection on pressing using a simple structure. For example, if the first and second support portions deflect in a bowl-shaped indentation in the pressing direction centered on the first and second mold portions, the gap can efficiently absorb the deflection.

[0032] The outer edge of the overlapping area observed from the pressing direction forms a closed line (loop). Therefore, the central line, which is the set of midpoints of the line connecting any point of the center of gravity to the outer edge, forms a closed line (loop). Furthermore, the minimum dimension of the pressing direction of the gap in each of the inner and outer regions is the dimension of the pressing direction of the gap at the point where the dimension of the pressing direction of the gap in each of the inner and outer regions is the smallest.

[0033] Alternatively, in two orthogonal directions viewed from the pressing direction, the minimum dimension of the gap in the unloaded state in the pressing direction of the inner region is smaller than the minimum dimension of the gap in the unloaded state in the pressing direction of the outer region. This allows for more efficient absorption of the bowl-shaped deflection centered on the first and second mold portions using the gap. For example, in both the long and short side directions of the overlapping region, the minimum dimension of the gap in the unloaded state in the inner region is smaller than the minimum dimension of the gap in the unloaded state in the outer region.

[0034] (Structure 2)

[0035] In structure 1 described above, the deformation of the gap in the overlapping region at the lower stop relative to the pressing direction of the gap in the overlapping region under no-load conditions may be greater than the deformation of the first and second machined surfaces at the lower stop relative to the pressing direction of the first and second machined surfaces under no-load conditions. Therefore, the influence of the deflection of the mold's support portion on the pressing process can be reduced using a simple structure.

[0036] For example, the gap in the unloaded state can be formed such that the shapes of the first and second machined surfaces in the unloaded state are the same as the shapes of the first and second machined surfaces at the bottom dead center. Furthermore, in the configuration where the shapes of the first and second machined surfaces in the unloaded state are the same as the shapes of the first and second machined surfaces at the bottom dead center, this configuration also includes cases where the shapes change only slightly to the extent that their impact on the shape accuracy of the pressed molded article can be ignored.

[0037] (Structure 3)

[0038] Alternatively, the minimum dimension of the gap in the pressing direction at the forming surface region where the first and second processing surfaces in the overlapping region contribute to the displacement of the pressing direction of the workpiece during pressing is smaller than the minimum dimension of the gap in the pressing direction of the peripheral region outside the forming surface region. This effectively reduces the influence of mold support deflection on pressing in the region centered on the forming surface of the mold.

[0039] (Structure 4)

[0040] In any of the structures 1 to 3 described above, at least one of the first mold portion and the second mold portion may include a portion in which, when viewed from the pressing direction, the dimension of the gap on the inner side of the overlapping region in the pressing direction of this portion is smaller than the dimension of the gap on the outer edge of the overlapping region in the pressing direction when viewed from the pressing direction.

[0041] The inventors discovered that by making the gap on the inner side of the region overlapping the first and second processing surfaces when viewed from the pressing direction smaller than the gap on the outer edge of the region overlapping the first and second processing surfaces, it is possible to easily absorb the deformation of the mold part caused by the deflection of the support portion using the gap. By reducing the gap of the inner portion relative to the gap of the portion overlapping the processing surfaces as described in structure 4 above, the deformation of the mold part caused by the deflection of the support portion can be further reduced.

[0042] (Structure 5)

[0043] In any of the structures 1 to 4 described above, the gap may be provided by at least one of the unevenness of the surface of the first mold part opposite to the first support part and the unevenness of the surface of the second mold part opposite to the second support part. This allows a gap to be provided in the mold part near the support part to absorb deformation caused by the deflection of the support part.

[0044] (Structure 6)

[0045] In structure 5 described above, at least one of the unevenness of the surface of the first mold part opposite to the first support part and the unevenness of the surface of the second mold part opposite to the second support part may include a portion such that, under no-load conditions, the degree of protrusion of this portion in the pressing direction of the inner side of the overlapping region when viewed from the pressing direction is greater than the degree of protrusion in the pressing direction of the outer edge of the overlapping region. This further reduces the deformation of the mold part caused by the deflection of the support part.

[0046] For example, at least one of the face of the first mold portion opposite to the first support portion and the face of the second mold portion opposite to the second support portion may include an inclined surface such that, in the unloaded state, the inclined surface protrudes more as it enters inward from the outer edge of the overlapping area when viewed from the pressing direction.

[0047] (Structure 7)

[0048] In any of the structures 1 to 6 described above, the gap may be provided using at least one of an insert plate inserted between the first mold portion and the first support portion and an insert plate inserted between the second mold portion and the second support portion. This allows a gap to be provided in the mold portion near the support portion to absorb deformation caused by the deflection of the support portion. Furthermore, the shape of the gap can be easily changed by replacing the insert plate. Additionally, the insert plate may, for example, be an insert plate with uneven thickness.

[0049] (Structure 8)

[0050] In structure 7 described above, at least one of the insert plate inserted between the first mold portion and the first support portion and the insert plate inserted between the second mold portion and the second support portion may include a portion such that, in a no-load state, the thickness of the inner side of the overlapping region when viewed from the pressing direction is greater than the thickness of the outer edge of the overlapping region. This further reduces the deformation of the mold portion caused by the deflection of the support portion.

[0051] For example, at least one of the insert plate inserted between the first mold portion and the first support portion and the insert plate inserted between the second mold portion and the second support portion may include a portion whose thickness increases as it moves inward from the outer edge of the overlapping region when viewed from the pressing direction, under no-load conditions. For example, the insert plate may include an inclined surface that increases in thickness as it moves inward from the outer edge of the overlapping region.

[0052] (Structure 9)

[0053] In any of the above 1 to 8, at least one of the first mold portion and the second mold portion may have: a machined surface including the first machined surface or the second machined surface; and a base for mounting the machined surface. In this case, the gap may be provided between the machined surface and the base in at least one of the first mold portion and the second mold portion. Moreover, the gap may be provided by the unevenness of the surface of the machined surface opposite to the base or the surface of the base opposite to the machined surface. Thus, a gap that absorbs deformation caused by the deflection of the support portion can be provided near the machined surface of the mold portion. Therefore, it is easy to reduce the deformation of the machined surface that affects the shape accuracy of the pressed molded article.

[0054] (Structure 10)

[0055] In the above structure 9, the unevenness of the surface of the processed surface opposite to the base or the surface of the base opposite to the processed surface may include a portion such that, under no-load conditions, the degree of protrusion of this portion in the pressing direction of the inner side of the overlapping region when viewed from the pressing direction is greater than the degree of protrusion in the pressing direction of the outer edge of the overlapping region. This further reduces the deformation of the mold portion caused by the deflection of the support portion.

[0056] For example, the surface of the processed face opposite the base or the surface of the base opposite the processed face may include an inclined surface such that, under no-load conditions, the inclined surface protrudes more as it enters inward from the outer edge of the overlapping area when viewed from the pressing direction.

[0057] (Structure 11)

[0058] In any of the structures 1 to 10 described above, at least one of the first mold portion and the second mold portion may have: a machining surface including the first machining surface or the second machining surface; and a base for mounting the machining surface. Alternatively, in at least one of the first mold portion and the second mold portion, the gap may be provided using an insert plate inserted between the machining surface and the base. This allows a gap to be provided near the machining surface of the mold portion to absorb deformation caused by the deflection of the support portion. Furthermore, the shape of the gap can be easily changed by replacing the insert plate. The insert plate may, for example, be an insert plate with uneven thickness.

[0059] (Structure 12)

[0060] In the structure 11 described above, the insert plate inserted between the processed surface and the base may include a portion in which, when viewed from the pressing direction, the thickness of the inner side of the overlapping region is greater than the thickness of the outer edge of the overlapping region under no-load conditions. This further reduces the deformation of the mold portion caused by the deflection of the support portion.

[0061] For example, the insert plate inserted between the processed surface and the base may include a portion that, in a no-load state, increases in thickness as it moves inward from the outer edge of the overlapping region when viewed from the pressing direction. Alternatively, the insert plate may include an inclined surface that increases in thickness as it moves inward from the outer edge of the overlapping region.

[0062] (Manufacturing method)

[0063] The method for manufacturing a pressed article using a pressing device is also included in embodiments of the present invention. The manufacturing method of an embodiment of the present invention includes the following steps: placing a pressing object between a first mold portion supported by a first support portion and a second mold portion supported by a second support portion of the pressing device; and pressing the first support portion and the second support portion closer together in the pressing direction, bringing a first processed surface of the first mold portion into contact with one side of the pressing object, and bringing a second processed surface of the second mold portion into contact with the other side of the pressing object, thereby performing pressing. At least one of the first mold portions and the second mold portion has at least a partial overlap region where the first and second processed surfaces overlap when viewed from the pressing direction, with a gap in the pressing direction that is non-uniform in two orthogonal directions when viewed from the pressing direction under no-load conditions. During the pressing, the size of the gap in the pressing direction at at least a partial location in the region is nearly uniform compared to the no-load condition. Furthermore, this manufacturing method can be performed using any of the pressing devices described in structures 1 to 12.

[0064] According to the manufacturing method described above, by providing the aforementioned uneven gap in the mold section under no-load conditions, the uneven gap can absorb the deformation of the mold section caused by the deflection of the support section during pressing. As a result, the deformation of the machined surface of the mold section caused by the deflection of the support section can also be reduced. In this way, the influence of the deflection of the mold support section on the pressing process can be reduced using a simple structure.

[0065] Alternatively, in the long and short side directions of the overlapping region in the unloaded state observed from the pressing direction, the minimum size of the gap in the pressing direction of the inner region inside the center of gravity of the overlapping region is smaller than the minimum size of the gap in the pressing direction of the outer region outside the center of gravity of the overlapping region.

[0066] Alternatively, the change in the dimension of the pressing direction of the gap in the forming surface region at the bottom dead center relative to the dimension of the pressing direction of the gap in the forming surface region under no-load conditions may be greater than the change in the shape of the first processing surface and the second processing surface at the bottom dead center relative to the shape of the first processing surface and the second processing surface under no-load conditions.

[0067] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals will be used to label the same or equivalent parts in the drawings without repeating their descriptions. Furthermore, to facilitate understanding, the structures are simplified or schematically shown in the drawings referred to below, or some constituent components are omitted.

[0068] [Implementation Method]

[0069] Figure 1 This is a side view showing a structural example of the pressing device according to this embodiment. Figure 1 The pressing device 1 shown includes a first mold part 2, a second mold part 3, a first support part 4, a second support part 5, a frame 6, and a slider drive part 7.

[0070] As an example, the first support portion 4 is a pad. The first support portion 4 supports the first mold portion 2. That is, the first mold portion 2 is mounted and fixed to the first support portion 4. The first mold portion 2 has a first processing surface 2a. The first processing surface 2a contacts one side of the workpiece W being pressed during pressing. The shape of the first processing surface 2a may also be the same as the target shape of the pressed workpiece. Alternatively, the shape of the first processing surface 2a may also be a shape obtained by subtracting the amount of elastic deformation during pressing, such as springback (elastic recovery), from the target shape of the pressed workpiece.

[0071] As an example, the second support portion 5 is a slider (pressure head). The second support portion 5 supports the second mold portion 3. That is, the second mold portion 3 is mounted and fixed to the second support portion 5. The second mold portion 3 has a second processing surface 3a. The second processing surface 3a contacts the other side (the side opposite to the first side) of the workpiece W during pressing. The shape of the second processing surface 3a may also be the same as the target shape of the pressed workpiece. Alternatively, the shape of the second processing surface 3a may also be a shape obtained by subtracting the amount of elastic deformation during pressing, such as springback (elastic recovery), from the target shape of the pressed workpiece.

[0072] The second support portion 5 is capable of reciprocating relative to the first support portion 4 in the pressing direction. Figure 1 In the example shown, the first support 4 is fixed relative to the frame 6. The second support 5 is mounted in a manner that allows it to reciprocate relative to the frame 6 in the pressing direction. Figure 1In the diagram, arrow P indicates the pressing direction. The slider drive unit 7 causes the second support unit 5 to reciprocate relative to the frame 6 in the pressing direction. The slider drive unit 7 can be driven by either a mechanical or hydraulic mechanism. Examples of a mechanical type include crank mechanisms, toggle mechanisms, or linkage mechanisms. Examples of a hydraulic slider drive unit 7 include slider drives with hydraulic cylinders. Alternatively, the slider drive unit can be a structure that uses a servo motor for drive control in either the mechanical or hydraulic case.

[0073] exist Figure 1 In the example shown, the frame 6 has a base on which the first support 4 (pad) is mounted, a support column extending upward from the base, and a crossbeam mounted on the support column. A slider drive 7 is disposed between the crossbeam and the second support 5.

[0074] Figure 1 A pressing device 1 is defined as a no-load state. In the no-load state, the first mold section 2 has a gap S1, and the second mold section 3 has a gap S2. The dimensions of the gaps S1 and S2 in the pressing direction in the no-load state are at least partially non-uniform in the overlapping area R1 that overlaps with the first processing surface 2a and the second processing surface 3a when viewed from the pressing direction.

[0075] The gaps S1 and S2 can be defined as the space between a convex surface protruding in the pressing direction or a concave surface recessed in the pressing direction of a component of the pressing device and a surface of a component of the pressing device that is opposite (facing) the convex surface or the concave surface and is perpendicular to the pressing direction.

[0076] exist Figure 1 In the example shown, the dimensions of the gaps S1 and S2 in the pressing direction at the center of the overlapping region R1 are smaller than the dimensions of the gaps S1 and S2 at the ends of the overlapping region R1. The dimensions of the gaps S1 and S2 in the pressing direction gradually decrease from the outer edge of the overlapping region R1 toward the inward side. That is, the dimensions of the gaps S1 and S2 in the pressing direction are smallest at the center of the overlapping region R1 and increase as they move from the center of the overlapping region R1 toward the ends. Thus, the gaps S1 and S2 preferably have a portion that decreases as they move inward from the outer edge of the overlapping region R1. As a result, the gaps S1 and S2 can easily absorb the deformation of the first mold part 2 and the second mold part 3 caused by the deflection of the first support part 4 and the second support part 5 during pressing.

[0077] Figure 1 This is a side view obtained from a direction perpendicular to the long side of the overlapping area. Figure 1 This indicates the shape of the gaps S1 and S1 along the longer side. Figure 1In the example shown, in the long side direction of the overlapping region R1, the minimum dimension of the pressing direction of the gaps S1 and S2 in the inner region R1u, which is located inside the center of gravity G of the overlapping region R1 and the center of the outer edge E1, is smaller than the minimum dimension of the pressing direction of the gaps S1 and S2 in the outer region R1s, which is located outside the center of gravity G and the center of the outer edge E1. Furthermore, although the diagram is omitted, in the short side direction of the overlapping region R1, the minimum dimension of the gaps S1 and S2 in the inner region R1u is also smaller than the minimum dimension of the outer region R1s. By constructing the gaps S1 and S2 in this way in the unloaded state, the deflection of the pressing device 1 can be absorbed efficiently using the gaps S1 and S2, suppressing the deformation of the first processing surface 2a and the second processing surface 3a at the lower stop point. Moreover, the long side direction and the short side direction are examples of two directions orthogonal when viewed from the pressing direction.

[0078] In addition, Figure 1 In the example shown, the minimum dimension of the pressing direction of the gaps S1 and S2 at the forming surface region R2 is smaller than the minimum dimension of the pressing direction of the gaps S1 and S2 in the peripheral region R3 outside the forming surface region R2. The forming surface region R2 is the region in the overlapping region R1 where the first processing surface 2a and the second processing surface 3a contribute to the displacement of the pressed workpiece in the pressing direction during pressing. The forming surface region R2 is the region contained within the overlapping region R1 when viewed from the pressing direction. In the forming surface region R2, at the bottom dead center, the pressed workpiece is displaced in the pressing direction corresponding to the shape of the first processing surface 2a and the second processing surface 3a. By thus constructing gaps S1 and S2d in an unloaded state, the deflection of the pressing device 1 can be absorbed efficiently using gaps S1 and S2, and the deformation of the first processing surface 2a and the second processing surface 3a at the bottom dead center can be suppressed.

[0079] When using the pressing device 1 to manufacture a pressed article, firstly, the workpiece to be pressed is positioned between the first mold section 2 and the second mold section 3. Next, the second support section 5 is moved closer to the first support section 4 using the slider drive section 7. The second support section 5 moves until the second mold section 3 reaches its lower stop point. At the lower stop point, the first machined surface 2a of the first mold section 2 contacts one side of the workpiece to be pressed, and the second machined surface 3a of the second mold section 3 contacts the other side of the workpiece to be pressed.

[0080] Figure 2 It means Figure 1The diagram shows the second mold section 3 of the pressing device 1 in the state of being at the lower stop point. At the lower stop point, a pressing load is applied to the first mold section 2 and the second mold section 3 from the first support section 4 and the second support section 5. A reaction force acts on the first support section 4 and the second support section 5 from the first mold section 2 and the second mold section 3. The first support section 4 and the second support section 5 flex due to this reaction force. The first mold section 2 and the second mold section 3 also deform due to their flexure.

[0081] exist Figure 2 In the example shown, at the bottom dead center, the first die part 2 and the second die part 3 deform to fill the gaps S1 and S2 in the unloaded state. The gaps S1a and S2a at the bottom dead center are narrower than the gaps S1 and S2 in the unloaded state. The dimensions of the gaps S1 and S2 in the pressing direction in the unloaded state change in a manner that is nearly uniform compared to the unloaded state during pressing. That is, the gaps S1 and S2 in the unloaded state deform in a manner that absorbs the deformation of the first die part 2 and the second die part 3 during pressing. As a result, the deformation of the first machined surface 2a of the first die part 2 and the second machined surface 3a of the second die part 3 caused by the deflection of the first support part 4 and the second support part 5 during pressing can be reduced.

[0082] exist Figure 1 and Figure 2 In the example shown, the deformation of the gaps S1 and S2 in the overlapping region R1 at the bottom dead center relative to the pressing direction of the gaps S1 and S2 in the unloaded state is greater than the deformation of the first machined surface 2a and the second machined surface 3a at the bottom dead center relative to the pressing direction of the first machined surface 2a and the second machined surface 3a in the unloaded state. Thus, the gaps S1 and S2 in the unloaded state are configured such that the shapes of the first machined surface 2a and the second machined surface 3a at the bottom dead center are approximately the same as those in the unloaded state.

[0083] If deflection occurs in the first support portion 4 and the second support portion 5 due to the pressing load, the first mold portion 2 and the second mold portion 3, which are connected to them, will also deflect in the same way. As a result, deformation due to deflection may also occur on the first machined surface 2a of the first mold portion 2 and the second machined surface 3a of the second mold portion 3. The spatial shape (gap) between the first machined surface 2a and the second machined surface 3a at the bottom dead center determines the shape of the pressed molded article. Therefore, the deformation of the first machined surface 2a and the second machined surface 3a becomes a major cause of reduced formability and shape accuracy of the pressed molded article, such as cracks and wrinkles.

[0084] In the above example, the gaps S1 and S2 between the first mold section 2 and the second mold section 3 under no-load conditions can absorb the deflection of the first support section 4 and the second support section 5 of the pressing device 1 during pressing. This reduces the amount of deformation of the machining surface of the mold section, which is the contact part with the material. As a result, the shape accuracy of the pressed product can be improved.

[0085] exist Figure 1 In the example shown, gap S1 is located inside the first mold part 2, and gap S2 is located inside the second mold part 3. As a variation, gap S1 can also be located between the first mold part 2 and the first support part 4, as detailed later. Gap S2 can also be located between the second mold part 3 and the second support part 5. Alternatively, gaps S1 and S2 can be formed by providing uneven surfaces on the surfaces of the first mold part 2 and the second mold part 3. Or, gaps S1 and S2 can be formed by insert plates inserted into the first mold part 2 and the second mold part 3.

[0086] exist Figure 1 In the example shown, the first mold part 2 has a base 21 and a machining surface 22. The machining surface 22 includes a first machining surface 2a. The machining surface 22 is mounted on the base 21. The base 21 is mounted on the first support part 4. The second mold part 3 has a base 31 and a machining surface 32. The machining surface 32 includes a second machining surface 3a. The machining surface 32 is mounted on the base 31. The base 31 is mounted on the second support part 5.

[0087] The facets 22 and 32 are, for example, insert molds. The bases 21 and 31 are, for example, insert receiving portions. The insert receiving portion has, for example, a recess that is recessed in the pressing direction. In this case, the insert mold is fixed in a state where it is inserted into the recess of the insert receiving portion. Furthermore, the insert receiving portion is not limited to a structure that uses a recess to receive the insert mold.

[0088] exist Figure 1 In the example shown, gap S1 is formed by the unevenness of the surface of the machining surface 22 of the first mold part 2 opposite to the base 21. Gap S2 is formed by the unevenness of the surface of the machining surface 32 of the second mold part 3 opposite to the base 31. The unevenness of the machining surfaces 22 and 32 is a shape that protrudes towards the bases 21 and 31. The surfaces of the bases 21 and 31 opposite to the machining surfaces 22 and 32 are planes perpendicular to the pressing direction.

[0089] As a variation, gaps S1 and S2 can also be formed by the unevenness of the surfaces of the bases 21 and 31 opposite to the machined surfaces 22 and 32. In this case, the unevenness of the bases 21 and 31 can also be a convex surface protruding in the pressing direction. In addition, in this case, the surfaces of the machined surfaces 22 and 32 opposite to the bases 21 and 31 become planes perpendicular to the pressing direction.

[0090] Thus, the gaps S1 and S2 under no-load conditions can be set as the gap between a member having a convex surface protruding in the pressing direction and a member having a flat surface opposite to the convex surface. In this case, if a pressing load is applied, the protruding part of the convex surface contacts the opposite surface first and bears the load. Therefore, it is easy to absorb the deflection caused by the pressing load using the gap.

[0091] Figure 3 This diagram shows a modified example of the structure in which gaps S1 and S2 are formed in the first mold section 2 and the second mold section 3. Figure 3 In the example shown, in the first mold section 2, a gap S1 is provided using an insert plate 23 of uneven thickness inserted between the machining surface 22 and the base 21. That is, the gap S1 is formed by the space between the insert plate 23 and the machining surface 22 or the base 21. In the second mold section 3, a gap S2 is provided using an insert plate 33 of uneven thickness inserted between the machining surface 32 and the base 31. That is, the gap S2 is formed by the space between the insert plate 33 and the machining surface 32 or the base 31.

[0092] Regarding the thickness of the insert plates 23 and 33, the central portion is the thickest, and it thins towards the periphery. The insert plates 23 and 33 are convex lens-shaped. One side of the insert plates 23 and 33 is flat, and the opposite side is a convex curved surface. Thus, the insert plates 23 and 33 can also include a portion where the thickness near the end of the overlapping region R1 is thinner than the thickness of the inner side of the overlapping region R1 away from the end. This further reduces the deformation of the first machined surface 2a and the second machined surface 3a caused by the deflection of the first support portion 4 and the second support portion 5. The insert plates 23 and 33 are arranged to protrude towards the first machined surface 2a and the second machined surface 3a. Conversely, the insert plates 23 and 33 can also be arranged to protrude away from the first machined surface 2a and the second machined surface 3a.

[0093] Figure 4 Viewed from the direction of suppression (above). Figure 3 The top view obtained from the first mold section 2 shown. Figure 4 In the image, the insertion plate 23 is represented by a dashed line. Figure 4In the example shown, when viewed from the pressing direction, the insert plate 23 has a shape that is substantially the same as the shape of the first processed surface 2a. That is, when viewed from the pressing direction, the insert plate 23 is provided in such a way that it completely overlaps with the area that overlaps with the first processed surface 2a. Alternatively, the insert plate 23 may be provided in such a way that it at least partially overlaps with the area that overlaps with the first processed surface 2a. Furthermore, the insert plate 23 may be provided in such a way that it completely includes the area that overlaps with the first processed surface 2a. For example, when viewed from the pressing direction, the insert plate 23 may be provided in an area that includes the first processed surface 2a and is larger than the first processed surface 2a. Similarly, the insert plate 33 may be provided in such a way that it completely overlaps with the second processed surface 3a when viewed from the pressing direction, or it may be provided in such a way that it at least partially overlaps with it.

[0094] The first processed surface 2a overlaps with the second processed surface 3a when viewed from the pressing direction. Therefore, in Figure 4 In the example, the outer edge of the first processed surface 2a becomes the outer edge of the overlapping region R1. The insert plate 23 completely overlaps with the overlapping region R1. When viewed from the pressing direction, the region inside the center line between the centroid G and the outer edge of the overlapping region R1 is the inner region R1u, and the region outside the center line is the outer region R1s. Figure 4 In the diagram, the central line between the centroid G and the outer edge is represented by a dashed line AR. The central line between the centroid G and the outer edge of the overlapping region R1 is the set of midpoints of the line segment connecting any point of the centroid G and the outer edge.

[0095] exist Figure 4 In the diagram, line 2aR represents the outer edge of the forming surface region R2. Within the forming surface region R2, either the first processing surface 2a or the second processing surface 3a has a shape that is raised or recessed in the pressing direction.

[0096] Figure 5 It means in Figure 4 The diagram shows the distribution of the dimensions of the gap S1 in the pressing direction under no-load conditions in the first mold section 2. Figure 6 This is a diagram showing the distribution of the dimensions of the gap S1 at the bottom dead center along the pressing direction. Figure 5 In the diagram, contour lines are represented by dashed lines, indicating positions where the dimensions of gap S1 in the pressing direction are equal under no-load conditions. Contour lines are shown at intervals of 0.025 mm. Figure 5 and Figure 6 In the diagram, different shades represent the range of each dimension of gap S1. Smaller dimension ranges are represented by denser shades. The area with the densest shade represents the region where the dimension of gap S1 in the pressing direction is 0–0.025 mm.

[0097] exist Figure 5In the example shown, under no-load conditions, the gap S1 formed by the insertion plate 23 is formed such that the gap S1 in the inner region R1u is smaller than the gap S1 in the outer region R1s. The closer to the center of gravity G towards the outside, the larger the gap S1 becomes. As a result, in both the long and short side directions of the overlapping region R1, the minimum size of the gap S1 in the pressing direction at the inner region R1u is smaller than the minimum size of the gap S1 in the pressing direction at the outer region R1s. Thus, by having a gradient of gap S1 in both the long and short side directions (i.e., two directions orthogonal when viewed from the pressing direction), the deflection of the pressing device can be efficiently absorbed. The long side direction of the overlapping region R1 is the direction with the longest size when viewed from the pressing direction. The short side direction is the direction perpendicular to the long side direction when viewed from the pressing direction. Figures 4-6 In the diagram, the x-direction is the direction of the longer side, and the y-direction is the direction of the shorter side.

[0098] exist Figure 5 In the example shown, under no-load conditions, the dimension of the gap S1 in the pressing direction of the peripheral region R3 is larger than the dimension of the gap S1 in the pressing direction of the forming surface region R2. The minimum dimension of the gap S1 in the pressing direction at the forming surface region R2 is smaller than the minimum dimension of the gap S1 in the pressing direction of the peripheral region R3 outside the forming surface region R2. This structure is visible in both the long and short side directions of the overlapping area. Therefore, the gap S1 can efficiently absorb the deflection caused by the difference between the displacement of the forming surface region and the displacement of the peripheral region of the pressing device.

[0099] exist Figure 6 In the example shown, at the bottom dead center, the gap S1 is 0–0.025 mm over the entire overlapping region R1. That is, at the bottom dead center, the gap S1 is smaller and nearly uniform in both the outer region R1s and the inner region R1u compared to the unloaded state.

[0100] The shapes of gaps S1 and S2 are determined by the shapes of the insert plates 23 and 33. By replacing the insert plates 23 and 33 with insert plates of different shapes, the shapes of gaps S1 and S2 can be changed. By configuring the structure that utilizes insert plates 23 and 33 to set the gaps S1 and S2, changing the shapes of gaps S1 and S2 becomes easy. Therefore, for example, a trial-and-error method can be used to set gaps S1 and S2 into shapes more suitable for reducing deformation caused by deflection.

[0101] Figure 7 This is a diagram showing another variation of the structure in which gaps S1 and S2 are formed in the first mold section 2 and the second mold section 3. Figure 7In the example shown, gap S1 is provided between the first mold part 2 and the first support part 4. Gap S2 is provided between the second mold part 3 and the second support part 5. Gap S1 is formed by the unevenness of the surface of the first mold part 2 opposite to the first support part 4. Gap S1 is the space between the uneven surface of the first mold part 2 and the first support part 4. The surface of the first support part 4 opposite to the first mold part 2 is a plane perpendicular to the pressing direction. Gap S2 is formed by the unevenness of the surface of the second mold part 3 opposite to the second support part 5. Gap S2 is the space between the uneven surface of the second mold part 3 and the second support part 5. The surface of the second support part 5 opposite to the second mold part 3 is a plane perpendicular to the pressing direction.

[0102] The unevenness of the surface of the first mold part 2 opposite to the first support part 4 includes the following portion: in the unloaded state, the protrusion of the pressing direction of the inner side of the overlapping area R1, which overlaps with the first processing surface 2a and the second processing surface 3a when viewed from the pressing direction, is greater than the protrusion of the pressing direction of the outer edge of the overlapping area R1. The unevenness of the surface of the second mold part 3 opposite to the second support part 5 includes the following portion: in the unloaded state, the protrusion of the pressing direction of the inner side of the overlapping area R1 of this portion is greater than the protrusion of the pressing direction of the outer edge of the overlapping area R1. As a result, the deformation of the first processing surface 2a and the second processing surface 3a caused by the deflection of the first support part 4 and the second support part 5 can be further reduced.

[0103] Figure 8 It means in Figure 7 The diagram shows the distribution of the dimensions of the gap S1 in the pressing direction under no-load conditions in the first mold section 2. Figure 9 This is a diagram showing the distribution of the dimensions of the gap S1 at the bottom dead center along the pressing direction. Figure 8 In the diagram, contour lines (points) for gap S1 are shown at intervals of 0.05 mm. Figure 8 and Figure 9 In the middle, the densest shade indicates that the size of the gap S1 in the pressing direction is in the range of 0 to 0.05 mm.

[0104] exist Figure 8 In the example shown, the dimension of the gap S1 in the pressing direction of the outer region R1s in the overlapping region R1 is larger than the dimension of the gap S1 in the pressing direction of the inner region R1u. Furthermore, in the overlapping region R1 and the regions outside it, the dimension of the outer gap S1 is larger than the dimension of the inner gap S1. That is, there is a tendency for the gap S1 to increase from the center of gravity G outwards. The minimum dimension of the gap S1 at the overlapping region R1 is smaller than the minimum dimension of the gap S1 in the regions outside the overlapping region R1. Therefore, in the regions of the first processing surface 2a and the second processing surface 3a and the regions outside them, the deflection of the pressing device can be absorbed by the gap S1.

[0105] In addition, Figure 8 In the example shown, the gap S1 in the peripheral region R3 is larger than the gap S1 in the forming surface region R2. The minimum dimension of the gap S1 in the pressing direction at the forming surface region R2 is smaller than the minimum dimension of the gap S1 in the pressing direction at the peripheral region R3. The outer edge of the peripheral region R3 is the outer edge of the base 21. Also in the peripheral region R3, there is a tendency for the gap S1 to decrease as it moves inward from the outer edge. This tendency is evident in both the long side direction and the short side direction.

[0106] exist Figure 9 In the example shown, at the bottom dead center, the gap S1 is 0–0.05 mm throughout the overlapping region R1. That is, at the bottom dead center, the gap S1 is smaller and nearly uniform in both the overlapping region R1 and the region outside it compared to the unloaded state.

[0107] Figure 10 It means Figure 7 A diagram of another variation of the example shown. In Figure 10 In the example shown, a gap S1 is provided using an insert plate 23 inserted between the first mold part 2 and the first support part 4. That is, gap S1 is formed by the space between the insert plate 23 and the first support part 4. A gap S2 is provided using an insert plate 33 inserted between the second mold part 3 and the second support part 5. That is, gap S2 is formed by the space between the insert plate 33 and the second support part 5.

[0108] Regarding the thickness of the insert plates 23 and 33, the central portion is the thickest, and it decreases towards the periphery. The insert plates 23 and 33 are convex lens-shaped. The side of the insert plates 23 and 33 that contacts the mold portion is flat, and the opposite side is a convex curved surface. In this way, the insert plates 23 and 33 can also include a portion where the thickness near the end of the overlapping region R1 is thinner than the thickness of the inner side of the overlapping region R1 away from the end. As a result, the deformation of the first machining surface 2a and the second machining surface 3a caused by the deflection of the first support portion 4 and the second support portion 5 can be further reduced.

[0109] (Analysis Results)

[0110] Using data obtained by modeling the pressing device, a pressing simulation is performed to analyze the shape accuracy of the pressed product. As the analysis model, a model with... Figure 3 The model (Model 1) of the pressing device for the insertion plates 23, 33 and gaps S1, S2 shown in the diagram. Figure 3A model (Model 2) of a pressing device without insertion plates 23 and 33 and without gaps S1 and S2 was simulated. In both Model 1 and Model 2, the frame 6, support parts 4 and 5, and mold parts 2 and 3 were all designed as elastic bodies capable of elastic deformation. Furthermore, a model (Model 3) with the same shape as Model 2 but with mold parts 2 and 3 as rigid bodies was also simulated. As a result of the simulation, the shape of the pressed product was obtained. The shapes of the pressed products of Model 1 and 2 were compared with the shape of the pressed product of Model 3. Specifically, the accuracy difference was calculated by quantifying the difference between the shapes of the pressed products of Model 1 and 2 and the pressed product of Model 3.

[0111] As a result of the analysis, the accuracy difference of the pressed-molded product of Model 1 with the insert plate is about half that of the pressed-molded product of Model 2 without the insert plate. This indicates that by setting an insert plate to create a gap under no-load conditions, the shape accuracy of the pressed-molded product can be improved. Furthermore, it was confirmed that in the case of Model 1, the deflection of the first machining surface 2a and the second machining surface 3a of the die at the lower stop point of the pressing process is smaller compared to the case of Model 2. This indicates that by setting an insert plate to create a gap under no-load conditions, the deflection of the machining surfaces can be reduced, thus improving the reduction in shape accuracy of the pressed-molded product caused by deflection.

[0112] The embodiments of the present invention have been described above. The pressing apparatus 1 of this embodiment can, for example, be used as a pressing apparatus for pressing and forming metal pressing objects. As an example, the pressing apparatus 1 described above can also be used as a pressing apparatus for pressing ultra-high strength (tensile strength 780 MPa or more) steel (ultra-high strength steel plate) as the pressing object. There is a tendency that poor shape accuracy caused by deformation of the die's machining surface due to deflection of the support portion of the pressing apparatus becomes particularly significant in pressing and forming high-strength pressing objects. Therefore, the pressing apparatus 1 and manufacturing method of this embodiment can be appropriately applied to the pressing and forming of high-strength steel.

[0113] The pressing apparatus of this embodiment is not limited to this; for example, it can be applied to pressing apparatuses with pressing loads of 10 to 2000 tonf. In particular, the pressing apparatus of this embodiment can be used in pressing apparatuses with pressing loads of 100 tonf or more. In this case, the influence of deflection on the dimensional accuracy of the pressed product of ultra-high strength steel can be suppressed.

[0114] Furthermore, the present invention is not limited to the embodiments described above. For example, in the above example, the insert plates 23 and 33 are plates with uneven thickness, but the thickness of the insert plates 23 and 33 may also be uniform. In this case, for example, both the portion where the insert plates 23 and 33 are configured and the portion where the insert plates 23 and 33 are not configured may be provided in the overlapping region R1. In this case, gaps S1 and S2 with uneven dimensions in the pressing direction may also be formed in the overlapping region R1.

[0115] In addition, Figure 1 The example shown depicts a structure where the first support portion 4 is fixed to the frame 6 and the second support portion 5 moves relative to the frame 6 in the pressing direction. However, the structure where the second support portion 5 reciprocates relative to the first support portion 4 in the pressing direction is not limited to this. For example, it could also be a structure where the second support portion 5 is fixed to the frame 6 and the first support portion 4 reciprocates relative to the frame. Alternatively, it could be configured such that both the first support portion 4 and the second support portion 5 reciprocate relative to the frame 6 in the pressing direction.

[0116] exist Figure 1 In the example shown, the first processing surface 2a includes a protrusion protruding in the pressing direction, and the second processing surface 3a includes a recessed portion in the pressing direction. That is, the first die part 2 is a punch, and the second die part 3 is a die. Alternatively, the first die part 2 may be a die, and the second die part 3 may be a punch. Furthermore, it is also possible to have a die part in addition to the first and second die parts. For example, in a pressing apparatus for deep drawing, a die part such as a pressure ring may be provided as an auxiliary die part in addition to the first and second die parts.

[0117] exist Figure 1 In the example shown, both the first mold part 2 and the second mold part 3 are composed of multiple components, including a machined surface and a base. Alternatively, at least one of the first mold part 2 and the second mold part 3 may be integrally formed from a single component. In this case, a gap is provided between the mold part integrally formed from a single component and the support part.

[0118] exist Figure 1 In the example shown, one first mold part is installed on the first support part 4, and one second mold part is installed on the second support part. Alternatively, multiple first mold parts may be installed on the first support part 4, and multiple second mold parts may be installed on the second support part. In this case, for example, multi-station mold pressing can be performed by moving a workpiece that has been pressed using one of the multiple mold parts on one support part to other mold parts for further pressing.

[0119] exist Figure 1In the example shown, gaps S1 and S2 are provided between the first mold part 2 and the second mold part 3. Alternatively, the structure could be configured such that one of the first mold part 2 and the second mold part 3 has a gap, while the other does not. In this case, the effect of reducing the deformation of the mold part caused by the deflection of the support part can also be achieved.

[0120] The above describes one embodiment of the present invention, but the above embodiment is merely an example for implementing the present invention. Therefore, the present invention is not limited to the above embodiment, and can be implemented by appropriate modifications without departing from its spirit.

[0121] Explanation of reference numerals in the attached figures

[0122] 1. Pressing device; 2. First mold part; 3. Second mold part; 4. First support part; 5. Second support part; 21, 31. Base part; 22, 32. Processed surface part; 23, 33. Insertion plate; S1, S2. Gap; W. Pressing object; R1. Overlapping area; R1u. Inner area; R1s. Outer area.

Claims

1. A pressing device for pressing and shaping a workpiece, wherein, The pressing device includes: The first mold part has a first machining surface that contacts one side of the workpiece to be pressed during pressing. The second mold part has a second processing surface that contacts the other side of the pressed object during pressing; A first support portion, which supports the first mold portion; and The second support portion supports the second mold portion and is capable of reciprocating relative to the first support portion in the pressing direction. At least one of the first mold portion and the second mold portion has at least a partial gap in the overlapping area where the first processing surface and the second processing surface overlap when viewed from the pressing direction. The gap in the pressing direction under no-load conditions is uneven in two orthogonal directions when viewed from the pressing direction. The minimum dimension of the pressing direction of the gap in the unloaded state in the inner region inside the center line is smaller than the minimum dimension of the pressing direction of the gap in the unloaded state in the outer region outside the center line. The center line is the set of midpoints of the line segment connecting the centroid of the overlapping region to any position on the outer edge of the overlapping region. The deformation of the gap in the overlapping region at the bottom dead center relative to the pressing direction of the gap in the overlapping region under no-load conditions is greater than the deformation of the first and second machined surfaces at the bottom dead center relative to the pressing direction of the first and second machined surfaces under no-load conditions. During compression molding, at least one of the first support portion and the second support portion flexes due to the compression load.

2. The pressing device according to claim 1, wherein, The minimum dimension of the gap in the pressing direction at the forming surface region where the first and second processing surfaces in the overlapping region contribute to the displacement of the pressing direction of the pressed object during pressing is smaller than the minimum dimension of the gap in the pressing direction of the peripheral region outside the forming surface region.

3. The pressing device according to claim 1 or 2, wherein, At least one of the first mold portion and the second mold portion includes a part in which, when viewed from the pressing direction, the dimension of the gap on the inner side of the overlapping region in the pressing direction of this part is smaller than the dimension of the gap on the outer edge of the overlapping region in the pressing direction when viewed from the pressing direction.

4. The pressing device according to claim 1 or 2, wherein, The gap is provided by at least one of the unevenness of the surface of the first mold part opposite to the first support part and the unevenness of the surface of the second mold part opposite to the second support part.

5. The pressing device according to claim 4, wherein, At least one of the unevenness of the surface of the first mold part opposite to the first support part and the unevenness of the surface of the second mold part opposite to the second support part includes the following portion: in the unloaded state, the degree of protrusion of the inner side of the overlapping area in the pressing direction when viewed from the pressing direction is greater than the degree of protrusion of the outer edge of the overlapping area in the pressing direction.

6. The pressing device according to claim 1 or 2, wherein, The gap is provided by at least one of an insertion plate inserted between the first mold part and the first support part and an insertion plate inserted between the second mold part and the second support part.

7. The pressing device according to claim 6, wherein, At least one of the insert plate inserted between the first mold part and the first support part and the insert plate inserted between the second mold part and the second support part includes a portion in which, when viewed from the pressing direction, the thickness of the inner side of the overlapping area is greater than the thickness of the outer edge of the overlapping area in an unloaded state.

8. The pressing device according to claim 1 or 2, wherein, At least one of the first mold portion and the second mold portion has: a machining surface including the first machining surface or the second machining surface; and a base for mounting the machining surface. The gap is provided in at least one of the first mold portion and the second mold portion between the processed surface and the base portion, and, The gap is created by the unevenness of the surface of the processed surface opposite to the base or the surface of the base opposite to the processed surface.

9. The pressing device according to claim 8, wherein, The unevenness of the surface of the processed face opposite to the base or the surface of the base opposite to the processed face includes the following portion: in a no-load state, the degree of protrusion of this portion in the pressing direction of the inner side of the overlapping area when viewed from the pressing direction is greater than the degree of protrusion in the pressing direction of the outer edge of the overlapping area.

10. The pressing device according to claim 1 or 2, wherein, At least one of the first mold portion and the second mold portion has: a machining surface including the first machining surface or the second machining surface; and a base for mounting the machining surface. In at least one of the first mold section and the second mold section, the gap is set by an insert plate inserted between the processed surface and the base.

11. The pressing device according to claim 10, wherein, The insert plate inserted between the processed surface and the base includes a portion in which, when viewed from the pressing direction, the thickness of the inner side of the overlapping area is greater than the thickness of the outer edge of the overlapping area in a no-load state.

12. A method for manufacturing a pressed-molded article, wherein the pressed-molded article is manufactured using a pressing device, wherein, The manufacturing method of this compressed molded article includes the following steps: A pressing object is disposed between a first mold portion supported by a first support portion and a second mold portion supported by a second support portion in the pressing device; and The first support portion and the second support portion are brought closer together in the pressing direction, the first machined surface of the first mold portion contacts one side of the workpiece to be pressed, and the second machined surface of the second mold portion contacts the other side of the workpiece to be pressed, thereby performing pressing and forming. At least one of the first mold portion and the second mold portion has at least a partial gap in the overlapping area where the first processing surface and the second processing surface overlap when viewed from the pressing direction. The gap in the pressing direction under no-load conditions is uneven in two orthogonal directions when viewed from the pressing direction. The minimum dimension of the pressing direction of the gap in the unloaded state in the inner region inside the center line is smaller than the minimum dimension of the pressing direction of the gap in the unloaded state in the outer region outside the center line. The center line is the set of midpoints of the line segment connecting the centroid of the overlapping region to any position on the outer edge of the overlapping region. During the pressing process, the dimension of the gap in the pressing direction at least locally in the overlapping region is nearly uniform compared to the unloaded state. The deformation of the gap in the overlapping region at the bottom dead center relative to the pressing direction of the gap in the overlapping region under no-load conditions is greater than the deformation of the first and second machined surfaces at the bottom dead center relative to the pressing direction of the first and second machined surfaces under no-load conditions. During compression molding, at least one of the first support portion and the second support portion flexes due to the compression load.

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