Die, die device, and pressing device

Abstract

Provided is a die that can adjust the amount of a processing oil that is between an object and a shaping surface that has recesses when the shape of the shaping surface is imparted to the object. A die (1) has a shaping surface (11) and is to be used to impart a shape that corresponds to the shape of the shaping surface (11) to an object (4). The shaping surface (11) has a plurality of recesses (12). The die (1) contains a suction passage (13), and the surface of at least one recess (12) of the plurality of recesses (12) has a suction port (14) that communicates with the suction passage (13).

Description

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[0001] The present disclosure relates to a mold, a mold device, and a press working device, and more particularly, to a mold for imparting a shape corresponding to the shape of a molding surface to an object, a mold device including the mold, and a press working device including the mold.

[0002] Patent Document No. 1 describes a method for manufacturing a fine shape transfer sheet in which a sheet-like base material and a mold having a fine concavo-convex shape are heated, and the fine concavo-convex shape is formed on the surface of the sheet-like base material by bringing both the sheet-like base material and the mold into contact with each other and applying pressure.

[0003] International Publication No. 2008 / 038789

[0004] An object of the present disclosure is to provide a mold capable of adjusting the amount of processing oil when the processing oil is interposed between the molding surface and the object when imparting the shape of the molding surface having recesses to the object, a mold device including the mold, and a press working device including the mold.

[0005] A mold according to one aspect of the present disclosure has a molding surface and is used to impart a shape corresponding to the shape of the molding surface to an object. The molding surface has a plurality of recesses. The mold has a suction passage inside, and the surface of at least one of the plurality of recesses has a suction port communicating with the suction passage.

[0006] A mold device according to one aspect of the present disclosure includes the mold and an intake device connected to the suction passage of the mold.

[0007] A press working device according to one aspect of the present disclosure includes a first press mold that is the mold and a second press mold disposed at a position facing the molding surface in the first press mold. At least one of the first press mold and the second press mold is movable along a direction orthogonal to the molding surface.

[0008] Figure 1 is a broken perspective view of a portion of a mold according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view of a portion of the same mold. Figure 3 is a plan view of a portion of the same mold. Figure 4 is a plan view of a portion of a modified example of the same mold. Figure 5 is a plan view of a portion of a modified example of the same mold. Figure 6 is a plan view of a portion of a modified example of the same mold. Figure 7 is a schematic diagram of a mold apparatus and press working apparatus equipped with the same mold. Figure 8 is a partial cross-sectional view showing the operation of the mold apparatus and press working apparatus. Figure 9 is a partial cross-sectional view showing the operation of the mold apparatus and press working apparatus. Figure 10 is a schematic diagram showing the operation of the mold apparatus and press working apparatus. Figure 11 is a schematic diagram showing the operation of the mold apparatus and press working apparatus. Figure 12 is a schematic diagram showing the operation of the mold apparatus and press working apparatus. Figure 13 is a partial cross-sectional view of a modified example of the same mold. Figure 14 is a partial cross-sectional view of a modified example of the same mold. Figure 15 is a schematic diagram showing an example of use of a product manufactured with the mold apparatus.

[0009] Embodiments and modifications of this disclosure will be described in detail below with reference to the drawings. However, the diagrams described in the embodiments and modifications below are schematic diagrams, and the dimensional ratios of each component do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the embodiments and modifications below are merely examples of this disclosure. This disclosure is not limited to the embodiments and modifications below, and various modifications are possible depending on the design, etc., as long as the effects of this disclosure can be achieved. It is also possible to combine different modifications.

[0010] 1. Overview of the Embodiment Figures 1 and 2 show the mold 1 of the embodiment. The mold 1 has a molding surface 11 and is used to impart a shape to an object 4 that corresponds to the shape of the molding surface 11. The molding surface 11 has a plurality of recesses 12. Therefore, using the mold 1, a plurality of protrusions 41 having shapes corresponding to the plurality of recesses 12 on the molding surface 11 are formed on the object 4.

[0011] When processing an object 4 using a mold 1 in this manner, a processing oil 5 is sometimes interposed between the molding surface 11 and the object 4 to suppress wear of the mold 1. The inventors independently investigated the effect of the amount of processing oil 5 on machinability and found that if the amount of processing oil 5 is excessive, it accumulates in the recess 12, and this processing oil 5 becomes trapped between the object 4 and the surface of the recess 12. As a result, the shape corresponding to the shape of the recess 12 may not be sufficiently imparted to the object 4, potentially reducing machinability. If the amount of processing oil 5 is reduced to ensure machinability, the amount of processing oil 5 may be insufficient, potentially failing to adequately suppress wear of the mold 1.

[0012] However, in this embodiment, the mold 1 has a suction passage 13 inside, and the surface of at least one of the plurality of recesses 12 has a suction port 14 that leads to the suction passage 13.

[0013] Therefore, when machining oil 5 is placed on the molding surface 11 of the mold 1, the pressure inside the suction passage 13 is reduced, and the machining oil 5 in the recess 12 is sucked into the suction passage 13 through the suction port 14. As a result, the amount of machining oil 5 remaining in the recess 12 can be adjusted, and thus it is less likely that there will be an excess or deficiency of machining oil 5 when it is interposed between the molding surface 11 and the workpiece 4. As a result, good machinability can be ensured while sufficiently suppressing wear on the mold 1.

[0014] 2. Details of the Embodiment (1) The mold 1 of the mold embodiment is made from a suitable metal. The mold 1 has a molding surface 11. The molding surface 11 is planar overall and has a plurality of recesses 12. Hereinafter, the direction perpendicular to the molding surface 11 will be referred to as the up and down direction, the side that the molding surface 11 faces in the up and down direction will be referred to as up, and the opposite side will be referred to as down.

[0015] In the embodiment, each recess 12 is a long groove-like structure in one direction along the molding surface 11 (i.e., one direction perpendicular to the vertical direction). Multiple recesses 12 are arranged in a direction perpendicular to the longitudinal direction of the recess 12 and along the molding surface 11 (i.e., a direction perpendicular to both the longitudinal direction and the vertical direction). In the following, unless otherwise specified, the longitudinal direction refers to the longitudinal direction of the recess 12, and the width direction refers to a direction perpendicular to both the longitudinal direction and the vertical direction.

[0016] In this embodiment, the cross-sectional shape of the recess 12 in a plane perpendicular to the longitudinal direction is sinusoidal. That is, the surface of the recess 12 is a smooth curved surface, and this surface of the recess 12 has a concave curved portion that constitutes the lower part of the recess 12 (hereinafter also referred to as the bottom portion 123), and two convex curved portions that are connected to both ends of the bottom portion 123 in the width direction (hereinafter also referred to as the convex curved portions 124). When multiple recesses 12 of this shape are arranged in the width direction, the aggregate of the surfaces of the recesses 12 constitutes a smooth sinusoidal curved surface.

[0017] The depth dimension Sd (vertical dimension) of the recess 12 is, for example, 1 μm or more and 0.5 mm or less. The width dimension Sw (width dimension) of the recess 12 is, for example, 1 μm or more and 0.5 mm or less. However, the dimensions of the recess 12 are not limited to the above.

[0018] In this embodiment, the molded surface 11 has a storage portion 15 that is recessed downward from the bottom 121 of the recess 12. In this embodiment, the recess 12 and the storage portion 15 are considered to be different elements. The storage portion 15 in this embodiment is a groove that is long in the longitudinal direction. The width dimension of the storage portion 15 is smaller than the width dimension of the recess 12 and also smaller than the width dimension of the bottom surface 123. The depth dimension (vertical dimension) of the storage portion 15 is smaller than the depth dimension Sd of the recess 12 and also smaller than the depth dimension of the bottom surface 123. The depth dimension (vertical dimension) of the storage portion 15 is, for example, 1 / 10 to 1 / 2 of the depth dimension Sd of the recess 12. The width dimension (width dimension) of the storage portion 15 is, for example, 1 / 20 to 1 / 5 of the width dimension Sw of the recess 12. However, the dimensions of the storage portion 15 are not limited to the above.

[0019] The mold 1 has a suction passage 13 inside, and the surface of the recess 12 has a suction port 14 that leads to the suction passage 13. That is, the suction port 14 is an opening on the surface of the recess 12, allowing the suction passage 13 to pass through to the outside of the mold 1.

[0020] At least one recess 12 surface has a suction port 14. In this embodiment, each surface of a plurality of recesses 12 has a suction port 14. Each surface of a recess 12 has a plurality of suction ports 14.

[0021] In this embodiment, suction ports 14 are located on the surface of the recess 12, on both sides in the width direction relative to the bottom 121 of the recess 12. Multiple suction ports 14 are arranged in a line in the longitudinal direction on one side in the width direction relative to the bottom 121, and multiple suction ports 14 are also arranged in a line in the longitudinal direction on the other side in the width direction relative to the bottom 121. The spacing between adjacent suction ports 14 in the longitudinal direction is, for example, 0.6 times or more the maximum diameter Sr of the suction port 14.

[0022] The suction port 14 is located above the bottom 121 of the recess 12. Particularly as in the embodiment, it is preferable that the height dimension Sh from the bottom 121 of the recess 12 to the suction port 14 is greater than half of the depth dimension Sd (vertical dimension) of the recess 12.

[0023] Furthermore, it is preferable that the suction port 14 is located on a convex curved portion of the surface of the recess 12. In this embodiment, the suction port 14 is located on a convex curved portion 124 of the surface of the recess 12.

[0024] Furthermore, it is preferable that the region 122 (see Figure 3) surrounding the suction port 14 on the surface of the recess 12 is lipophilic. Having lipophilicity means, for example, that a treatment has been applied to enhance its lipophilicity. In this case, region 122 has higher lipophilicity than the region 122 on the surface of the recess 12. Treatments that enhance lipophilicity include, for example, surface roughening treatments or treatments that form fine grooves in a stripe pattern. The improvement in lipophilicity due to these treatments can be evaluated using the Wenzel formula or the Cassie-Boxer formula. The contact angle of the oil containing mineral oil, synthetic oil, or vegetable oil as a base oil in region 122 is preferably less than 90°, and more preferably 60° or less.

[0025] There are no restrictions on the shape of the suction port 14. In this embodiment, the suction port 14 is circular, but it may also be oval-shaped (see Figure 4), or polygonal (see Figure 5), hexagonal (see Figure 6), or other shapes.

[0026] The maximum diameter Sr of the suction port 14 is preferably 1 / 2 or less of the width dimension Sw of the recess 12. Furthermore, it is also preferable that the maximum diameter Sr of the suction port 14 is 1 / 10 or more of the width dimension Sw of the recess 12, and more preferably 1 / 8 or more.

[0027] The maximum diameter Sr of the suction port 14 is the largest possible diameter value that can be measured at the suction port 14. For example, if the suction port 14 is perfectly circular, the maximum diameter Sr is the diameter. If the suction port 14 is oval or other oblong shape, the maximum diameter Sr is the major axis. If the suction port 14 is polygonal, the maximum diameter Sr is the longest distance between two vertices (see Figures 4 to 6).

[0028] The recess 12 may be formed on the entire molding surface 11, or it may be formed on only a part of the molding surface 11.

[0029] In this embodiment, the suction passage 13 is composed of a tubular cavity formed inside the mold 1. The suction passage 13 has a longitudinally long main passage 131 located below each groove, and a plurality of secondary passages 132 extending from the main passage 131 to each suction port 14. One end of the main passage 131 is open to the outside on a surface (side) other than the molding surface 11 of the mold 1, while the other end of the main passage 131 is closed inside the mold 1.

[0030] (2) The mold device 2 of the mold device and press working device embodiment comprises a mold 1 and an intake device 21 connected to the suction passage 13 of the mold 1 (see Figure 7). The intake device 21 is, for example, an intake pump. The intake device 21 and the mold 1 are connected by an intake pipe 22.

[0031] The press working apparatus 3 of this embodiment includes a first press die 31 and a second press die 32. The first press die 31 is the die 1 of this embodiment. The second press die 32 is positioned opposite the forming surface 11 of the first press die 31. At least one of the first press die 31 and the second press die 32 is movable in the vertical direction. For example, the press working apparatus 3 includes an appropriate actuator for moving at least one of the first press die 31 and the second press die 32 in the vertical direction.

[0032] This press working apparatus 3 allows a suitable object 4 to be pressed using a first press die 31 and a second press die 32. Specifically, by placing the object 4 between the first press die 31 and the second press die 32, and moving at least one of the first press die 31 and the second press die 32 so that they are closer together, the object 4 can be pressed by the first press die 31 and the second press die 32.

[0033] The press working apparatus 3 may include an intake device 21 connected to the suction passage 13 of the first press die 31. In that case, the press working apparatus 3 of the embodiment is also the die apparatus 2 of the embodiment.

[0034] (3) The processing of the object 4 using the mold 1 and press working apparatus 3 of the operating embodiment will be described.

[0035] Object 4 is made of metal, such as brass. Object 4 is also in the form of a plate, for example. However, there are no restrictions on the material and shape of Object 4.

[0036] The machining oil 5 is applied to the surface of the recess 12 of the molding surface 11 in the mold 1 (first press mold 31) by an appropriate method such as spray application (see Figure 8). The machining oil 5 contains, for example, mineral oil and fatty oil. The machining oil 5 is a liquid oil for machining, such as a lubricating oil or cutting oil. The amount of machining oil 5 is greater than the minimum amount required to suppress wear of the mold 1.

[0037] With the machining oil 5 positioned in the recess 12, the intake device 21 is activated to reduce the pressure inside the suction passage 13. As a result, the machining oil 5 is drawn towards the suction port 14 within the recess 12, and any excess machining oil 5 is sucked into the suction passage from the suction port 14. This ensures that the amount of machining oil 5 in the recess 12 is appropriate, and that this machining oil 5 spreads and wets the surface of the recess 12 (see Figure 9).

[0038] In this case, if the area 122 surrounding the suction port 14 on the surface of the recess 12 is roughened, the affinity of this area 122 with the machining oil 5 is increased, making it easier for the machining oil 5 to be retained around the suction port 14. As a result, the machining oil 5 can easily wet and spread from the bottom 121 of the recess 12 to the area around the suction port 14. In addition, excessive suction of the machining oil 5 from the suction port 14 can be suppressed.

[0039] Furthermore, in this embodiment, since the suction port 14 is located on the convex curved portion 124, which is a convex curved portion on the surface of the recess 12, the machining oil 5 that is drawn up to the area around the suction port 14 is easily retained around the suction port 14. This also makes it easier for the machining oil 5 to wet and spread from the bottom of the recess 12 to the area around the suction port 14.

[0040] Furthermore, in this embodiment, the height dimension Sh from the bottom 121 of the recess 12 to the suction port 14 is greater than half the depth dimension Sd of the recess 12. As a result, the machining oil 5 spreads from the bottom of the recess 12 to the area around the suction port 14, allowing the machining oil 5 to spread over a wide area on the surface of the recess 12.

[0041] Furthermore, in this embodiment, the molding surface 11 has a storage section 15, and when processing oil 5 is placed in the recess 12, the storage section 15 is filled with processing oil 5. Therefore, even if the amount of processing oil 5 in the recess 12 decreases as it is gradually sucked out from the suction port 14, the amount of processing oil 5 in the recess 12 is supplied from the storage section 15 to the recess 12, which can prevent the amount of processing oil 5 in the recess 12 from becoming too small over time.

[0042] The suction pressure when reducing the pressure by suctioning within the suction passage 13 is set appropriately so that the amount of machining oil 5 in the recess 12 is maintained at an appropriate level. For example, the suction pressure is adjusted within the range of 0.5 MPa to 0.9 MPa.

[0043] With the inside of the suction path 13 being in a depressurized state, an object 4 is placed between the first press die 31 and the second press die 32 (see Fig. 10), and at least one of the first press die 31 and the second press die 32 is moved so that the first press die 31 and the second press die 32 approach each other (see Fig. 11). Thereby, press working is performed on the object 4. At this time, the surface of the object 4 facing the molding surface 11 is pressed against the concave portion 12 and deformed, and thereby a convex portion 41 having a shape corresponding to the shape of the concave portion 12 is formed on the object 4 (see Fig. 12). Also, at this time, in the embodiment, since the maximum diameter Sr of the suction port 14 is 1 / 2 or less of the width dimension Sw of the concave portion 12, the suction port 14 hardly affects the shape imparted to the object 4. Also by this, good workability can be maintained.

[0044] In the embodiment, since an excessive amount of the processing oil 5 in the concave portion 12 is suppressed, it can be suppressed that the deformation of the object 4 is hindered by the processing oil 5 in the concave portion 12. For this reason, the convex portion 41 formed on the object 4 can have an appropriate shape corresponding to the shape of the concave portion 12. For this reason, good workability can be maintained. Also, in the embodiment, an excessive decrease in the amount of the processing oil 5 in the concave portion 12 is suppressed. Further, in the embodiment, the processing oil 5 can spread wet over a wide range on the surface of the concave portion 12. For this reason, the processing oil 5 can easily spread sufficiently between the object 4 and the surface of the concave portion 12. Therefore, even if a large force is applied from the object 4 to the surface of the concave portion 12 by press working, wear of the surface of the concave portion 十二 can be effectively suppressed. Therefore, the mold 1 can have a long life.

[0045] 3. Modified Example The concave portion 12 in the embodiment is in the shape of a concave groove, but the concave portion 12 may have an appropriate shape such as a circular shape in plan view, for example.

[0046] The cross-sectional shape of the concave portion 12 in the embodiment on a plane perpendicular to the longitudinal direction of the concave portion 12 is a sine wave shape, but the concave portion 12 may have an appropriate cross-sectional shape other than the sine wave shape. For example, the cross-sectional shape of the concave portion 12 may be a triangular wave shape. That is, the surface of the concave portion 12 may have two planar surfaces that are arranged so as to sandwich the bottommost portion 121 of the concave portion 12 and slope downward toward the bottommost portion 121 (see Fig. 13).

[0047] In addition, in the embodiment, the molding surface 11 has a storage portion 15 that is recessed downward from the bottommost portion 121 of the recess 12, but the molding surface 11 may not have the storage portion 15 (see FIG. 14).

[0048] In the embodiment, the region 122 around the suction port 14 on the surface of the recess 12 may or may not be roughened. Also, instead of roughening this region 122, or in addition to roughening this region 122, the lipophilicity of this region 122 may be improved by an appropriate method. Also in this case, the processing oil 5 is likely to be held around the suction port 14. Therefore, the processing oil 5 is likely to spread wetly from the bottommost portion 121 of the recess 12 to around the suction port 14. Also, the excessive suction of the processing oil 5 from the suction port 14 can be suppressed.

[0049] The mold 1 of the embodiment is used for press working, but the mold 1 does not have to be a mold for press working as long as the mold 1 is used to press the molding surface 11 against the object 4.

[0050] 4. Use of the object After the object 4 has been processed by the mold 1, the object 4 can be used as an appropriate product. Also, there is no particular limitation on the purpose of imparting a shape corresponding to the shape of the molding surface 11 of the mold 1 to the object 4. One of the purposes of imparting a shape corresponding to the shape of the molding surface 11 of the mold 1 to the object 4 is to improve slidability. If a plurality of convex portions 41 corresponding to the shape of the recess 12 are formed on the object 4 using the mold 1, the slidability of the surface of the object 4 in the direction along the longitudinal direction of the convex portions 41 can be enhanced.

[0051] Object 4 is used, for example, as a movable contact body 6 in a switch such as a toggle switch or rocker switch (see Figure 15). A pin 7 connected to the lever of the switch contact body contacts the movable contact body 6, and the movable contact body 6 operates as the pin 7 slides on the movable contact body in response to the operation of the lever. The pin 7 is made of resin, for example. If the pin 7 slides repeatedly on the movable contact body 6, seizure may occur due to frictional heat. If lubricant is applied to the movable contact body 6 to suppress seizure, it becomes troublesome to apply the lubricant repeatedly, and there is also the cost of procuring the lubricant. However, by using the mold 1 of the embodiment to form a plurality of long protrusions 41 along the direction of movement of the pin 7 on the surface of the movable contact body 6 where the pin 7 slides, the sliding performance of the pin 7 on the movable contact body 6 is improved, and frictional heat is less likely to be generated. Therefore, seizure can be suppressed without repeatedly applying lubricant.

[0052] 5. Embodiments As will be apparent from the above embodiments and modifications, this disclosure includes the following embodiments.

[0053] The mold (1) of the first embodiment has a molding surface (11) and is a mold (1) for imparting a shape to an object (4) according to the shape of the molding surface (11). The molding surface (11) has a plurality of recesses (12). The mold (1) has a suction passage (13) inside, and the surface of at least one of the plurality of recesses (12) has a suction port (14) that leads to the suction passage (13).

[0054] According to this embodiment, when a molded surface (11) having a recess (12) is given to an object (4), if a processing oil (5) is interposed between the molded surface (11) and the object (4), the amount of processing oil (5) in the recess (12) can be adjusted by reducing the pressure in the suction passage (13) and sucking the processing oil (5) from the suction port (14).

[0055] In the second embodiment, as in the first embodiment, each of the plurality of recesses (12) is a groove-like structure that is elongated in one direction along the molding surface (11). The plurality of recesses (12) are arranged in a direction perpendicular to the longitudinal direction of the recess (12) and along the molding surface (11).

[0056] According to this embodiment, a mold (1) can be used to provide the object (4) with a plurality of unidirectionally elongated protrusions (41) having a shape corresponding to the shape of the recess (12).

[0057] In a third embodiment, in the first or second embodiment, the cross-sectional shape of the plurality of recesses (12) in a plane perpendicular to the longitudinal direction of the recesses (12) is sinusoidal.

[0058] In the fourth embodiment, as in the third embodiment, the suction port (14) is located on a convex curved portion of the surface of the recess (12).

[0059] According to this embodiment, when the processing oil (5) is sucked in from the suction port (14), the processing oil (5) is more easily retained around the suction port (14) on the surface of the recess (12).

[0060] In the fifth embodiment, in any one of the first to fourth embodiments, the suction port (14) is circular, oval, or polygonal in shape.

[0061] In the sixth embodiment, in any one of the first to fifth embodiments, the maximum diameter (Sr) of the suction port (14) is 1 / 2 or less of the width dimension (Sw) of the recess (12).

[0062] According to this embodiment, when imparting a shape to the object (4) according to the shape of the molded surface (11), the suction port (14) is less likely to affect the shape imparted to the object (4).

[0063] In the seventh embodiment, in any one of the first to sixth embodiments, the height dimension (Sh) from the bottom (121) of the recess (12) to the suction port (14) is greater than half the depth dimension (Sd) of the recess (12).

[0064] According to this embodiment, the machining oil (5) is sucked in from the suction port (14), allowing the machining oil (5) to wet and spread over a wide area on the surface of the recess (12).

[0065] In the eighth embodiment, in any one of the first to seventh embodiments, the region (122) on the surface of the recess (12) surrounding the suction port (14) is lipophilic.

[0066] In this embodiment, when the processing oil (5) is sucked in from the suction port (14), the processing oil (5) is more likely to be retained around the suction port (14).

[0067] The mold apparatus (2) according to the ninth embodiment comprises a mold (1) according to any one of the first to eighth embodiments, and an intake device (21) connected to the suction passage (13) of the mold (1).

[0068] According to this embodiment, the processing oil (5) can be sucked from the suction port (14) by reducing the pressure inside the suction passage (13) with the intake device (21).

[0069] The press working apparatus (3) according to the tenth embodiment comprises a first press die (31) which is a die (1) according to any one of the first to eighth embodiments, and a second press die (32) which is positioned opposite the forming surface (11) of the first press die (31). At least one of the first press die (31) and the second press die (32) is movable along a direction perpendicular to the forming surface (11).

[0070] According to this embodiment, by applying press processing to the object (4) with the press processing device (3), the object (4) can be given a shape corresponding to the shape of the molding surface (11).

[0071] 1. Mold 11. Molding surface 12. Recess 122. Area 13. Suction passage 14. Suction port 2. Mold device 21. Intake device 3. Pressing device 31. First press mold 32. Second press mold 4. Object 41. Convex portion 5. Processing oil

Claims

1. A mold having a molding surface, for imparting a shape to an object according to the shape of the molding surface, wherein the molding surface has a plurality of recesses, the mold has a suction passage inside, and the surface of at least one of the plurality of recesses has a suction port leading to the suction passage.

2. The mold according to claim 1, wherein each of the plurality of recesses is a groove-like structure elongated in one direction along the molding surface, and the plurality of recesses are arranged in a direction perpendicular to the longitudinal direction of the recess and along the molding surface.

3. The mold according to claim 1 or 2, wherein the cross-sectional shape of the plurality of recesses in a plane perpendicular to the longitudinal direction of the recess is sinusoidal.

4. The mold according to claim 3, wherein the suction port is located on a convex curved portion of the surface of the recess.

5. The mold according to claim 1, wherein the suction port is circular, oval, or polygonal in shape.

6. The mold according to claim 1, wherein the maximum diameter of the suction port is 1 / 2 or less of the width dimension of the recess.

7. The mold according to claim 1, wherein the height dimension from the bottom of the recess to the suction port is greater than half the depth dimension of the recess.

8. The mold according to claim 1, wherein the region on the surface of the recess, around the suction port, is lipophilic.

9. A mold apparatus comprising a mold according to claim 1, and an intake device connected to the suction passage of the mold.

10. A press working apparatus comprising: a first press die which is the mold described in claim 1; and a second press die positioned opposite the molding surface of the first press die, wherein at least one of the first press die and the second press die is movable along a direction perpendicular to the molding surface.

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