CN117840339A - Press forming method - Google Patents

Press forming method Download PDF

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Publication number
CN117840339A
CN117840339A CN202211209997.2A CN202211209997A CN117840339A CN 117840339 A CN117840339 A CN 117840339A CN 202211209997 A CN202211209997 A CN 202211209997A CN 117840339 A CN117840339 A CN 117840339A
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CN
China
Prior art keywords
molded body
line
arc
target
upper die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211209997.2A
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Chinese (zh)
Inventor
松谷健司
高桥纯辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
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Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to CN202211209997.2A priority Critical patent/CN117840339A/en
Priority to JP2023159972A priority patent/JP2024052584A/en
Priority to US18/373,315 priority patent/US20240109113A1/en
Publication of CN117840339A publication Critical patent/CN117840339A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

A press molding method includes a 1 st step and a 2 nd step, wherein in the 1 st step, a sheet material (18) is pressed to form an intermediate molded body (32), and the intermediate molded body (32) has an intermediate ridge line portion (30) having an edge radius larger than that of a ridge line portion (16) of a target molded body (20); in the step 2, the intermediate molded body (32) is punched to form a target molded body (20) including a ridge line portion (16), and in a cross section (62) in a direction orthogonal to the extending direction of the ridge line portion (16), a 1 st slack portion (46) and a 2 nd slack portion (48) bulging outward in the edge radius than the target molded body (20) are provided on both sides of an included angle center line (50) which bisects the angle of the 1 st side (64) and the 2 nd side (66) of the ridge line portion (16) sandwiching the target molded body (20) on the intermediate molded body (32). Accordingly, interference between the intermediate molded body and the upper mold can be suppressed.

Description

Press forming method
Technical Field
The present invention relates to a press molding method for molding a plate material into a predetermined shape.
Background
An outer panel of an automobile is generally produced by press molding (press molding) a plate material composed of metal. In press forming, wrinkles or cracks are generated when ridge line portions of a small radius of curvature are formed on a metal plate material, and thus advanced techniques are required. For example, international publication No. 2019/102972 discloses a press molding method in which a ridge portion having a small radius of curvature is formed by steps 1 and 2, wherein in step 1, an intermediate molded body having a larger molding radius than an edge radius of the ridge portion is molded, and in step 2, a target molded body is formed from the intermediate molded body.
Disclosure of Invention
In the press molding method described above, the intermediate molded body is provided so as to be bulged outward of the target molded body, so that the margin of expansion (elongation) at the time of forming the ridge line portion is ensured in advance. However, when the angle (angle θ) of the plane adjacent to the ridge line portion becomes smaller, the expansion in the vicinity of the ridge line portion further increases, and the bulging of the intermediate molded body needs to be further increased. However, it has been found that: if the expansion of the intermediate molded body is excessive, the intermediate molded body may come into contact with an upper die when the intermediate molded body is clamped by the upper die and a platen (blank holder), and thus it is difficult to clamp the intermediate molded body by the upper die and the platen, and damage may occur to the molded article.
The present invention aims to solve the above-mentioned technical problems.
In the following aspect, a press molding method is disclosed, which includes a 1 st step and a 2 nd step, wherein in the 1 st step, a sheet material is pressed to form an intermediate molded body having an intermediate ridge line portion with an edge radius larger than that of a ridge line portion of a target molded body; in the step 2, the intermediate molded body is pressed to form the target molded body including the ridge line portion, and the intermediate molded body has, on both sides of an included angle center line, which is a line bisecting an angle between the 1 st and 2 nd sides of the ridge line portion sandwiching the target molded body, a 1 st and 2 nd slack portion bulging outward of an edge radius of the target molded body, in a cross section in a direction orthogonal to an extending direction of the ridge line portion.
In the press molding method of the above aspect, by providing the intermediate molded body with the slack portions on both sides of the center line of the included angle, the maximum deviation of the slack portions of the target molded body and the intermediate molded body in the travel direction (stroke direction) can be suppressed, and the intermediate molded body and the upper die can be suppressed from interfering with each other.
The above objects, features and advantages should be easily understood by the following description of the embodiments with reference to the attached drawings.
Drawings
Fig. 1 is a perspective view of a target molded body molded by the press molding method of the embodiment.
Fig. 2 is a cross-sectional view of an intermediate molded body according to an embodiment.
Fig. 3A is an explanatory diagram (first) showing a method for specifying the shape of the intermediate-formed body according to the embodiment, and fig. 3B is an explanatory diagram (second) showing a method for specifying the shape of the intermediate-formed body according to the embodiment.
Fig. 4 is an explanatory diagram (iii) showing a method for specifying the shape of the intermediate molded body according to the embodiment.
Fig. 5A is an explanatory view of a process of disposing the intermediate molded body of fig. 3A in the molding die of step 2, and fig. 5B is an explanatory view of a process of sandwiching the intermediate molded body of fig. 5A by a platen and an upper die.
Fig. 6A is an explanatory view of the upper die being lowered toward the lower die, and fig. 6B is an explanatory view of the intermediate formed body in a state where the region of coincidence is in contact with the lower die.
Fig. 7A is a cross-sectional view of an intermediate molded body according to a comparative example, and fig. 7B is an explanatory diagram showing interference between the intermediate molded body of fig. 7A and a molding die (comparative example).
Detailed Description
The press molding method described below is suitable for manufacturing, for example, the outer panel 10 of the roof panel or the trunk portion of the automobile shown in fig. 1. The press molding method is suitable for molding the outer panel 10, and the outer panel 10 has, for example, a ridge portion 16 sandwiched by flat portions 14 of 90 ° or less of a spoiler (spoler) 12 or the like. This embodiment describes an example of forming the rectangular plate 18 shown in fig. 1. The illustrated plate 18 is a target formed body 20 after press forming, and is the outer plate 10 of the trunk portion. In fig. 1, the target molded body 20 is shown in a state in which a line II-II portion at the center in the vehicle width direction is cut in two.
The target molded body 20 has a product portion 22 and a discard portion 24. The product portion 22 is a portion to be used as a product, and the discard portion 24 is a portion to be cut and removed after press molding. The reject portion 24 is located at the peripheral edge portion of the sheet material 18, and is a band-like portion surrounding the product portion 22. The product portion 22 has the ridge portion 16. The ridge portion 16 has a curvature radius (edge radius) as small as 2.5mm to 9mm, for example, and has a sharp-blade-like appearance. The ridge portion 16 is, for example, the spoiler 12 integrally formed with the outer panel 10. The target molded body 20 has a 1 st slope 26 on one side of the ridge portion 16 and a 2 nd slope 28 on the other side. The ridge portion 16 is sandwiched by the 1 st slope 26 and the 2 nd slope 28. The angle θ at which the 1 st slope 26 and the 2 nd slope 28 sandwich the ridge portion 16 is, for example, 30 ° to 90 °.
The plate material 18 used in the press forming method of the present embodiment is, for example, a steel plate or an aluminum alloy plate having a thickness of 0.3mm to 3 mm. The press molding method of the present embodiment forms the target molded body 20 having the ridge line portion 16 with a small radius of curvature by pressing the plate material 18 such as a steel plate or an aluminum alloy plate. In order to mold the target molded article 20, the press molding method according to the present embodiment includes two press molding steps, namely, a 1 st step and a 2 nd step.
The 1 st step is performed by press forming (drawing process), for example. Step 1, the flat plate material 18 is molded, and as shown in fig. 2, an intermediate molded body 32 is formed.
The intermediate molded body 32 shown in fig. 2 has an intermediate ridge portion 30, a conforming region 34, and a reject portion 24. Wherein the intermediate ridge portion 30 has an inner region 36 and a slack portion 38. The inner region 36 is offset downward in the press stroke direction (press stroke direction) with respect to the target molded body 20 by the maximum deviation Ha. The maximum deviation Ha is set according to the expansion rate L of the discard section 24 when the intermediate molded body 32 is used to mold the target molded body 20, and is set at a distance H from the upper die 42 to the matching region 34 in a holding (hold) step described later 2nd Equal.
The slack portions 38 are disposed on the 1 st-direction side portion and the 2 nd-direction side portion of the inner region 36, respectively. The slack 38 is connected to the inner region 36 by a smooth curved surface. The conforming region 34 is located at a portion surrounding the periphery of the intermediate ridge portion 30. That is, the slack portion 38 has: a 1 st slack 46 located on the 1 st-direction side of the inner region 36; and a 2 nd slack 48 located on the 2 nd side of the inner region 36.
The 1 st slack 46 and the 2 nd slack 48 are curved so as to bulge out of the edge radius of the target molded body 20. The 1 st slack 46 is offset outward from the 1 st slope 26 of the target molded body 20. The 1 st slack 46 is connected to the inner region 36 by a smooth circular arc. The spacing distance of the portion of the 1 st slack portion 46 that is farthest from the 1 st slope 26 in the press stroke direction is referred to as the maximum deviation Hb1. The maximum deviation Hb1 of the 1 st slack 46 is set to a value smaller than the value of the maximum deviation Ha of the inside region 36 from the target molded body 20.
The deviation of the 1 st slack 46 from the target molded body 20 gradually decreases as approaching the alignment region 34 from the position indicating the maximum deviation Hb1. The 1 st slack 46 is connected to the conforming region 34 near the outer periphery of the product portion 22, and the conforming region 34 is a region conforming to the shape of the target molded body 20. The 1 st slack 46 is connected to the reject 24 through the conforming area 34.
The 2 nd slack portion 48 is offset outward relative to the 2 nd slope 28 of the target formed body 20. The 2 nd slack 48 is connected to the inner region 36 by a smooth circular arc. The distance separating the portion of the 2 nd slack portion 48 that is farthest from the 2 nd inclined surface 28 of the target formed body 20 in the press stroke direction is referred to as the maximum deviation Hb2 of the 2 nd slack portion 48. The maximum deviation Hb2 of the 2 nd slack portion 48 is set to the same value as the maximum deviation Hb1 of the 1 st slack portion 46.
The deviation of the 2 nd slack portion 48 from the target molded body 20 gradually decreases as approaching the coincidence region 34 from the position indicating the maximum deviation Hb2. The 2 nd slack portion 48 is connected to the conforming region 34 near the outer periphery of the product portion 22, and the conforming region 34 is a region conforming to the shape of the target molded body 20.
The maximum inclination angle θ1 of the 1 st slack 46 is smaller than the maximum inclination angle θr1 of the 1 st slope 26 of the target molded body 20. The maximum inclination angle θ2 of the 2 nd slack portion 48 is smaller than the maximum inclination angle θr2 of the 2 nd inclined surface 28 of the target molded body 20. Therefore, in the 1 st step (press molding), the extension of the 1 st and 2 nd slack portions 46 and 48 of the intermediate-formed body 32 can be suppressed, and the intermediate-formed body 32 can be molded with the tension and thickness reduced suppressed.
The conforming region 34 is located at a portion surrounding the outer periphery of the intermediate ridge portion 30. The conforming area 34 is an area of the product portion 22 having the same shape as the target molded body 20. The intermediate ridge portion 30 is connected to the reject portion 24 by a conforming region 34.
The reject portion 24 is located on the outer peripheral side of the product portion 22. As shown in fig. 5B, the discard section 24 is sandwiched between the platen 40 and the upper die 42 in step 2. As shown in fig. 2, the discarding portion 24 is located outside the matching region 34, and surrounds the matching region 34.
The reject portion 24 has a step 52 and a securing structure 54. The stepped portion 52 is adjacent to the outside of the product portion 22. The stepped portion 52 is inclined downward at an angle steeper than the 1 st inclined surface 26 and the 2 nd inclined surface 28. The upper end of the stepped portion 52 constitutes the upper end of the discard portion 24. The upper end of the stepped portion 52 is connected to the conforming area 34 of the product portion 22.
The fixing structure 54 is a portion sandwiched between the platen 40 and the upper die 42 in the holding process. The fixing structure 54 is adjacent to the outside of the stepped portion 52. The fixing structure 54 protrudes outward at a smaller inclination angle than the stepped portion 52. The securing structure 54 surrounds the outer periphery of the product portion 22. The fixing structure 54 is formed with a groove-shaped locking rib 56. The locking rib 56 prevents the sheet 18 from moving in the molding surface direction by the engagement of the locking recess 58 of the platen 40 and the locking protrusion 60 of the upper die 42.
Next, a method for determining the specific shape of the intermediate formed body 32 in fig. 2 will be described.
The shape of the intermediate ridge portion 30 is determined based on the cross-sectional shape of the target molded body 20 shown in fig. 3A. First, as shown in the drawing, the cross section 62 of the target molded body 20 is cut in a direction perpendicular to the extending direction of the ridge line portion 16. Next, a tangent to the 1 st slope 26 at a portion closest to the ridge line portion 16 in the cross section 62 is obtained as the 1 st side 64. Further, a tangent line of the 2 nd slope 28 at a portion closest to the ridge line portion 16 is obtained as the 2 nd side 66. The 1 st side 64 and the 2 nd side 66 intersect above the ridge portion 16. The angle formed by edges 1 and 2, 66 is the included angle θ.
Next, a straight line passing through the intersection 68 of the 1 st side 64 and the 2 nd side 66 and bisecting the angle θ is obtained as the angle center line 50.
Next, as shown in fig. 3B, the distance H between the alignment region 34 and the upper die 42 in the holding step is determined 2nd . Distance of separation H 2nd The larger the value of (c), the larger the maximum deviations Hb1, hb2 of the 1 st and 2 nd slack portions 46, 48 can be increased. However, an excessive spacing distance H 2nd The step 52 of the discard portion 24 is stretched to a large extent when the target molded body 20 is molded, and the quality of the outer panel 10 is impaired. Thus, the distance H 2nd The thickness variation due to the expansion of the discard portion 24 is set in a range of 20% or less, for example.
Next, as shown in fig. 3B, the intersection 68 is offset upward in the press stroke direction by a distance H 2nd The cross-sectional shape of the target molded body 20 is set to the virtual upper die line 70. Further, a virtual line 76 is obtained. The virtual line 76 is a distance H below the intersection point 68 in the press stroke direction 2nd Is positioned perpendicular to the included angle centerline 50.
Next, as shown in fig. 4, a 1 st tangential line 72 and a 2 nd tangential line 74 passing through the intersection 68 and tangential to the virtual upper die line 70 are set. The 1 st tangent line 72 is a straight line (tangent line) tangent to the 1 st-direction side of the virtual upper die line 70 at a point, and the 2 nd tangent line 74 is a straight line (tangent line) tangent to the 2 nd-direction side of the virtual upper die line 70 at a point.
Next, a 1 st arc 78 tangent to the virtual line 76 and the 1 st tangent line 72 and a 2 nd arc 80 tangent to the virtual line 76 and the 2 nd tangent line 74 are obtained. The 1 st arc 78 has one end at the point of tangency with the virtual line 76 and the other end at the point of tangency with the 1 st tangent line 72. The radius of curvature R1 of the 1 st arc 78 is set from a range that can ensure product quality (linear displacement) when press forming is performed in the 1 st step. The radius of curvature R1 is a value larger than the edge radius of the ridge portion 16 of the target molded body 20. More preferably, the radius of curvature R1 is set to: the point of tangency of the 1 st arc 78 with the imaginary line 76 is located near the included angle centerline 50 and the point of tangency of the 1 st arc 78 with the 1 st tangent 72 is located near the point of tangency of the 1 st tangent 72 with the imaginary upper die line 70.
The 2 nd arc 80 has one end at the point of tangency with the virtual line 76 and the other end at the point of tangency with the 2 nd tangent line 74. The radius of curvature R2 of the 2 nd arc 80 is set from a range that can ensure product quality (linear displacement) when press forming is performed in the 1 st step. The radius of curvature R2 is a value larger than the edge radius of the ridge portion 16 of the target molded body 20. More preferably, the radius of curvature R2 is set to: the tangent point of the 2 nd arc 80 to the imaginary line 76 is located near the included angle centerline 50 and the tangent point of the 2 nd arc 80 to the 2 nd tangent line 74 is located near the tangent point of the 2 nd tangent line 74 to the imaginary upper die line 70.
The shapes of the inner region 36, a part of the 1 st slack 46, and a part of the 2 nd slack 48 are obtained by connecting the 1 st arc 78 and the 2 nd arc 80.
Next, the 2 nd intersection 82 at which the 1 st tangent 72 intersects the target molded body 20 is obtained. Then, the 3 rd arc 84 that smoothly connects the 2 nd intersection 82 and the 1 st arc 78 is obtained. The center of curvature of the 3 rd arc 84 is located outside the target molded body 20. The 3 rd arc 84 is a curve protruding inward of the target molded body 20. The radius of curvature R3 of the 3 rd arc 84 is set such that the 3 rd arc 84 smoothly connects the coincident region 34 of the 1 st arc 78 and the 1 st slope 26.
Further, the 3 rd intersection point 86 at which the extended line of the 2 nd tangent 74 intersects the target molded article 20 is obtained. Then, the 4 th arc 88 that smoothly connects the 3 rd intersection 86 and the 2 nd arc 80 is obtained. The center of curvature of the 4 th arc 88 is located outside the target molded body 20. The 4 th arc 88 is a curve protruding inward of the target molded body 20. Preferably, the radius of curvature R4 of the 4 th arc 88 is set such that the 4 th arc 88 smoothly connects the conforming region 34 of the 2 nd arc 80 and the 2 nd slope 28.
The shape of the intermediate ridge portion 30 is determined by connecting the 1 st arc 78, the 2 nd arc 80, the 3 rd arc 84, and the 4 th arc 88 described above. After that, the shape of the matching region 34 matching the shape of the product portion 22 of the target molded body 20 is set outside the intermediate ridge portion 30, and the matching region 34 and the intermediate ridge portion 30 are connected. The shape of the discard section 24 is set outside the matching area 34. The shape of the discard portion 24 coincides with the discard portion 24 of the virtual upper mold line 70.
The cross-sectional shape of the intermediate ridge portion 30 is obtained by the above steps (shape determining step). The cross-sectional shapes of the intermediate ridge portions 30 as described above are sequentially obtained along the ridge portions 16, and the overall shape of the intermediate molded body 32 is determined by connecting these cross-sectional shapes.
Next, step 2 of the press molding method according to the present embodiment will be described.
As shown in fig. 5A to 6B, step 2 is a step of press-molding the intermediate molded body 32 to mold the target molded body 20. Step 2 forms the intermediate ridge portion 30 having a relatively large edge radius into the ridge portion 16 having a smaller edge radius.
First, as shown in fig. 5A, the intermediate molded body 32 is carried into a molding die 90 of step 2. The molding die 90 has a lower die 44, an upper die 42, and a platen 40. The product portion 22 of the intermediate molded body 32 is disposed above the lower die 44, and the discard portion 24 is disposed above the platen 40.
Next, as shown in fig. 5B, a holding step is performed in which the intermediate-formed body 32 is sandwiched between the upper die 42 and the platen 40. The holding process is performed by a platen 40 and an upper die 42. The upper die 42 descends toward the platen 40. The reject portion 24 of the intermediate formed body 32 is pressed against the platen 40 by the descent of the upper die 42. As a result, the intermediate formed body 32 is sandwiched between the platen 40 and the upper die 42.
The intermediate molded body 32A according to the comparative example shown in fig. 7A has a slack portion 38A only on one side of the inner region 36A. When the included angle θ is smaller, the slack portion 38A of the intermediate formed body 32A needs to be expanded more.
The maximum inclination angle θ0 (fig. 4) of the slack portion 38A of such intermediate formed body 32A is larger than the maximum inclination angle θr2 of the 2 nd inclined surface 28 of the target formed body 20. Therefore, in the intermediate formed body 32A of the comparative example, the elongation L and the tension increase (thickness change) of the intermediate formed body 32A occur in the step 1.
As shown in fig. 7B, the intermediate molded body 32A having the large slack portion 38A interferes with the upper mold 42 in the holding step. In step 2, the intermediate molded body 32A slides in contact with the upper die 42, and the slack portion 38A is damaged.
In contrast, as shown in fig. 5B, the 1 st and 2 nd slack portions 46, 48 of the intermediate formed body 32 of the present embodiment are set to have the maximum deviations Hb1, hb2 respectively, which are larger than the distance H between the matching region 34 and the upper die 42 2nd Is small. Therefore, according to the press molding method of the present embodiment, the intermediate molded body 32 and the upper die 42 can be prevented from interfering with each other in the holding step, and damage and recess of the intermediate molded body 32 can be prevented.
After that, as shown in fig. 6A, a press molding step is performed in which the intermediate molded body 32 is pressed by the upper die 42 and the lower die 44. The upper die 42 is displaced in the press stroke direction (downward) toward the lower die 44. The intermediate formed body 32 is pressed by the upper die 42 and the lower die 44 to be gradually deformed. Sheet 18 moves from 1 st slack 46 and 2 nd slack 48 to inner region 36 in response to the stretching associated with deformation of intermediate ridge 30. A sufficient amount of the sheet material 18 is supplied from the 1 st slack portion 46 and the 2 nd slack portion 48 located on both sides of the ridge line portion 16. As a result, as shown in fig. 6B, the target molded body 20 is formed, and the ridge portion 16 having the acute angle θ is formed. The press molding method of the present embodiment can prevent cracking or reduction in plate thickness of the ridge line portion 16.
The above inventions are summarized as follows.
One embodiment is a press molding method including a 1 st step and a 2 nd step, wherein in the 1 st step, a sheet material 18 is pressed to form intermediate molded bodies 32, 32A, and the intermediate molded bodies 32, 32A have intermediate ridge line portions 30, 30A having edge radii larger than edge radii of the ridge line portions 16 of the target molded body 20; in the step 2, the intermediate molded body 32 is pressed to form the target molded body 20 including the ridge line portion 16, and the intermediate molded body 32 has, on both sides of an included angle center line 50, a 1 st slack portion 46 and a 2 nd slack portion 48 bulging outward of an edge radius than the target molded body 20 in a cross section 62 in a direction orthogonal to an extending direction of the ridge line portion 16, wherein the included angle center line 50 is a line bisecting an angle between a 1 st side 64 and a 2 nd side 66 of the ridge line portion 16 sandwiching the target molded body 20.
According to the press molding method described above, by providing the slack portion bulging outward of the edge radius of the target molded body 20 on both sides of the included angle center line 50, a large expansion margin can be ensured while suppressing the deviation in the stroke direction. Therefore, the objective molded body 20 having a clear ridge line can be formed without causing cracks in the ridge line portion 16 and without causing surface distortion while avoiding interference between the upper die 42 and the intermediate molded body 32.
In the press molding method, the intermediate molded body 32 may have inner regions 36 and 36A offset inward of the edge radius of the target molded body 20 at positions adjacent to the included angle center line 50, and the maximum deviation Ha of the intermediate molded body 32 from the target molded body 20 in the press stroke direction of the inner region 36 may be larger than the maximum deviations Hb1 and Hb2 of the intermediate molded body 32 from the target molded body 20 in the press stroke direction of the 1 st and 2 nd slack portions 46 and 48. In this press molding method, the upper die 42 and the intermediate ridge portion 30 can be prevented from interfering with each other by preventing the slack portion from bulging. Therefore, this press molding method can prevent the intermediate ridge portion 30 from being damaged by sliding in contact with the upper die 42, and can form the target molded body 20 without damage.
The press molding method may further include a shape determining step of determining the shape of the intermediate molded body 32, the shape determining step including the steps of: a step of drawing (drawing) the included angle center line 50 at a position where an angle bisecting the 1 st side 64 and the 2 nd side 66 of the ridge portion 16 sandwiching the target molded body 20 is obtained; a step of drawing a virtual upper die line 70 for shifting the target molded body 20 upward in the press stroke direction by the maximum deviation Ha; a step of drawing a 1 st tangent line 72 and a 2 nd tangent line 74 from an intersection 68 of the included angle center line 50 and the 1 st and 2 nd edges 64, 66, wherein the 1 st tangent line 72 is tangent to a 1 st-directional side of the virtual upper die line 70, and the 2 nd tangent line 74 is tangent to a 2 nd-directional side of the virtual upper die line 70; a step of drawing an imaginary line 76 perpendicular to the included angle center line 50 at a position offset from the intersection point 68 to a position below the press stroke direction by the maximum deviation Ha; a step of obtaining a 1 st arc 78 and a 2 nd arc 80, wherein the 1 st arc 78 is inscribed with the 1 st tangent line 72 and the virtual line 76, and the 2 nd arc 80 is inscribed with the virtual line 76 and the 2 nd tangent line 74; a step of obtaining a 3 rd arc 84, wherein the 3 rd arc 84 connects an end portion of the 1 st arc 78 in the 1 st direction and a matching region 34 matching a shape of the target molded body 20 in the 1 st direction; and a step of obtaining a 4 th arc 88, wherein the 4 th arc 88 connects the 2 nd end of the 2 nd arc 80 and the matching region 34 matching the shape of the target molded body 20 in the 2 nd direction. The press molding method can simultaneously achieve suppression of the elongation L of the ridge line portion 16 and prevention of interference between the intermediate ridge line portion 30 and the upper die 42.
In the press molding method described above, the intermediate molded body 32 may have the discard portion 24 sandwiched between the platen 40 and the upper die 42, and the matching region 34 may be spaced apart from the upper die 42 by a distance H in the press stroke direction when the intermediate molded body 32 is sandwiched between the platen 40 and the upper die 42 2nd The same as the maximum deviation Ha. This press molding method can suppress displacement (linear displacement) of the intermediate molded body 32 in the molding surface direction in step 2.
In the press molding method, the maximum inclination angle θ0 of the intermediate ridge portion 30 of the intermediate molded body 32 may be smaller than the maximum inclination angle θr1 of the target molded body 20. This press molding method can suppress the tension generated in the intermediate molded body 32 in step 1.
The present invention is not limited to the above description, and various structures can be adopted without departing from the spirit of the present invention.

Claims (5)

1. A press molding method comprising the steps 1 and 2,
in the step 1, a sheet material (18) is punched to form an intermediate molded body (32), and the intermediate molded body (32) has an intermediate ridge line portion (30) with an edge radius larger than that of the ridge line portion (16) of the target molded body (20);
in the step 2, the intermediate molded body 32 is punched to form the target molded body 20 including the ridge line portion 16,
it is characterized in that the method comprises the steps of,
in a cross section (62) in a direction orthogonal to the extending direction of the ridge line portion (16), the intermediate molded body (32) has, on both sides of an angle center line (50), a 1 st slack portion (46) and a 2 nd slack portion (48) bulging outward of an edge radius than the target molded body (20), wherein the angle center line (50) is a line bisecting an angle between a 1 st side (64) and a 2 nd side (66) of the ridge line portion (16) sandwiching the target molded body (20).
2. The press molding method according to claim 1, wherein,
the intermediate molded body (32) has an inner region (36) that is offset inward of the edge radius of the target molded body (20) at a location adjacent to the included angle center line (50), and the maximum deviation (Ha) in the press stroke direction of the intermediate molded body (32) from the target molded body (20) is greater than the maximum deviations (Hb 1, hb 2) in the press stroke direction of the intermediate molded body (32) from the target molded body (20) at the 1 st slack (46) and the 2 nd slack (48).
3. The press molding method according to claim 2, wherein,
further comprising a shape determining step of determining the shape of the intermediate molded body (32),
the shape determining step includes the steps of:
a step of drawing the included angle center line (50) at a position where the angle of the 1 st side (64) and the 2 nd side (66) sandwiching the ridge line portion (16) of the target molded body (20) is halved;
a step of drawing a virtual upper die line (70) for shifting the target molded body (20) upward in the press stroke direction by the maximum deviation (Ha);
a step of leading out a 1 st tangent line (72) and a 2 nd tangent line (74) from an intersection point (68) of the included angle center line (50) with the 1 st side (64) and the 2 nd side (66), wherein the 1 st tangent line (72) is tangent to a 1 st-direction side of the imaginary upper die line (70), and the 2 nd tangent line (74) is tangent to a 2 nd-direction side of the imaginary upper die line (70);
a step of drawing an imaginary line (76) orthogonal to the included angle center line (50) at a position offset from the intersection point (68) to the lower side of the press stroke direction by the maximum deviation (Ha);
a step of obtaining a 1 st arc (78) and a 2 nd arc (80), wherein the 1 st arc (78) is inscribed with the 1 st tangent line (72) and the virtual line (76), and the 2 nd arc (80) is inscribed with the virtual line (76) and the 2 nd tangent line (74);
a step of obtaining a 3 rd arc (84), wherein the 3 rd arc (84) connects an end portion of the 1 st arc (78) in the 1 st direction and a matching region (34) matching the shape of the target molded body (20) in the 1 st direction;
and a step of obtaining a 4 th arc (88), wherein the 4 th arc (88) connects the 2 nd end of the 2 nd arc (80) and the matching region (34) matching the shape of the target molded body (20) in the 2 nd direction.
4. The press molding method according to claim 3, wherein,
the intermediate molding body (32) has a discard portion (24) held by a pressing plate (40) and an upper die (42), and the conforming region (34) and the upper die (42) are spaced apart by a distance (H) in the press stroke direction when the intermediate molding body (32) is held by the pressing plate (40) and the upper die (42) 2nd ) Identical to said maximum deviation (Ha).
5. The press molding method according to any one of claims 1 to 4, wherein,
the maximum inclination angle (theta 0) of the intermediate ridge portion (30) of the intermediate molded body (32) is smaller than the maximum inclination angle (theta r 1) of the target molded body (20).
CN202211209997.2A 2022-09-30 2022-09-30 Press forming method Pending CN117840339A (en)

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CN202211209997.2A CN117840339A (en) 2022-09-30 2022-09-30 Press forming method
JP2023159972A JP2024052584A (en) 2022-09-30 2023-09-25 Press molding method
US18/373,315 US20240109113A1 (en) 2022-09-30 2023-09-27 Press forming method

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