WO2020158478A1 - プレス部品の製造方法及びブランク材の製造方法 - Google Patents
プレス部品の製造方法及びブランク材の製造方法 Download PDFInfo
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- WO2020158478A1 WO2020158478A1 PCT/JP2020/001724 JP2020001724W WO2020158478A1 WO 2020158478 A1 WO2020158478 A1 WO 2020158478A1 JP 2020001724 W JP2020001724 W JP 2020001724W WO 2020158478 A1 WO2020158478 A1 WO 2020158478A1
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- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
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- 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
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- 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
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- 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
- B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank
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- 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
- B21D28/00—Shaping by press-cutting; Perforating
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- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
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- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
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- 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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/28—Associations of cutting devices therewith
Definitions
- the present invention is a technology related to the manufacture of a press part having a part shape in which stretch flange deformation occurs in the press forming.
- Patent Documents 1 to 3 various countermeasures for edge cracks in the stretch flange have been conventionally proposed (Patent Documents 1 to 3, etc.).
- Patent Document 1 proposes a method of adding extra thickness using a press die.
- Patent Document 2 it is proposed to use a blank shape in which stretch flange cracking is unlikely to occur.
- the method of Patent Document 2 since the blank shape is restricted, the degree of freedom of the product shape is restricted.
- Patent Document 3 is a method for improving the state of the end surface of the cracked portion, but the purpose is to improve the stretch flangeability of the punched end surface caused by punching the metal plate, and is applied to the stretch flange portion of the outer periphery of the product. Can not. Further, the cutting method by double punching described in Non-Patent Document 1 is also a punching technique and cannot be applied to the stretch flange portion on the outer periphery of the product.
- JP 2008-119736 A Japanese Patent No. 4959605 Japanese Patent No. 5387022
- the present invention has been made in view of the above points, and it is an object of the present invention to provide a technique capable of suppressing end cracking due to stretch flange deformation while suppressing the occurrence of restrictions on the shape of a desired press part.
- one aspect of the present invention is a method for manufacturing a press part that manufactures a press part through one or more press moldings, and at least one press of the above-mentioned one or more press moldings. If it is estimated that edge cracking due to stretch flange deformation at the edge of the material to be pressed is likely to occur during forming, the edge cracking may occur as a pre-treatment for press forming that may cause the edge cracking. There is a double cutting process in which the cutting process of the end portion including at least the portion is performed twice, and the double cutting process is performed at a position including a portion where the edge crack may occur during the first cutting. The gist is to perform a cutting to form a typical beam-shaped overhang portion, and to cut the overhang portion for the second time.
- another aspect of the present invention is a method for manufacturing a blank material that becomes a pressed part through one or more press moldings, wherein at least one of the one or more press moldings is press-molded. If it is estimated that edge cracks due to stretch flange deformation at the edge of the material are suspected, there is a two-time cutting process in which the edge cutting including at least the location where the edge cracking is concerned is performed twice. In the second cutting, the first cutting is performed to form a partial beam-shaped overhanging portion at a position including a portion where the edge crack may occur, and the second cutting is performed. The gist is to cut the overhanging portion.
- the method for manufacturing a press part according to the present embodiment is a method for manufacturing a press part, which is a method for manufacturing a target press part through one or more press forming processes.
- the press molding in each press molding is performed by, for example, foam molding or draw molding.
- the manufacturing method of the press part of this embodiment is a technique in the case where at least one press forming causes a stretch flange deformation which causes a stretch deformation along the plate edge.
- the press part 10 having the shape shown in FIG. 1D is manufactured by one press molding (one press step) will be described as an example.
- the part shape of the pressed part 10 illustrated in FIG. 1D includes a top plate portion 11, a vertical wall portion 12 continuous with the top plate portion 11, and a flange portion 13 continuous with the vertical wall portion 12.
- a part of the flange portion 13 is cracked at the end due to deformation of the stretch flange.
- reference numeral 3 in FIG. 1(d) indicates the position of the crack concerned portion
- reference numeral 3'in FIG. 2(d) indicates the position corresponding to the crack concerned portion where the end crack actually occurred. ..
- Reference numeral 3A in FIGS. 1(b), 1(c), and 2(c) indicates the position of the cracking concern portion 3 in the pressed material. Further, reference numeral 1A indicates a flange-corresponding portion corresponding to a region that becomes the flange portion 13 in the pressed material 1.
- the presence/absence of the crack concern part 3 due to the stretch flange deformation and the position of the crack concern part 3 are determined by executing a simulation analysis such as a CAE analysis.
- the press-molding may be actually performed, and the parts after the press-molding may be observed to confirm the presence or absence of the crack-susceptible portion 3 due to the stretch flange deformation, and to specify the position of the crack-susceptible portion 3.
- a pretreatment for performing press molding there is a trim step of shearing the outer periphery of the blank material 1 exemplifying the material to be pressed into a contour shape corresponding to the shape of the press part 10.
- the end of the flange corresponding portion (at least the position of the cracking concern portion 3) corresponding to the flange portion 13 in which the edge cracking due to the deformation of the stretch flange is concerned is shown in FIG.
- a double cutting process for performing double cutting according to the present invention is performed.
- the end portion of the flange corresponding portion 1A to be subjected to the double cutting process is cut at the end as shown in FIG.
- the cutting is performed so that the partial beam-shaped overhanging portion 2 is formed at a position including a portion where there is a risk of partial cracking.
- the overhanging portion 2 is cut, and the blank material 1 is formed into the contour shape of the target edge. That is, in the present embodiment, when the blank material 1 is cut into the target contour shape in the trim step, the side (edge) of the flange corresponding portion 1A is partially located at a position including the crack concern portion 3A.
- the cutting process of FIG. 2C showing the conventional process is executed in the two steps of FIGS. 1B and 1C in this embodiment.
- the steps (b) and (c) of FIG. 1 may be performed in one step.
- the double cutting process according to the present invention may be performed independently of the trim process. For example, a plurality of steps (not shown) may be provided between (c) and (d) of FIG. 1, and the double cutting process based on the present invention may be executed during the plurality of steps.
- the width W (length along the edge of the material) of the overhanging portion 2 is 1 ⁇ 3 or less of the length L along the edge of the flange portion 13, or 150 of the plate thickness of the blank material 1. It is preferably not more than double.
- the beam-like overhanging portion 2 is not temporarily formed by forming the temporary beam-like overhanging portion 2 having the width W by the first cutting (shearing) (see FIG. 2).
- the lower limit value of the width W of the overhanging portion 2 is not particularly limited as long as it includes the position where the cracking concern portion 3 is estimated to occur and can be sheared.
- the lower limit value of the width W is, for example, not less than the opening amount at the edge due to the edge cracking due to the stretch flange deformation.
- the width W of the overhanging portion 2 is preferably 20 mm or more in consideration of easiness of cutting by shearing and the like.
- the overhang amount H of the overhang portion 2 (the maximum value of the overhang amount (projection amount) from the target contour position) is preferably 10 times or less the plate thickness of the blank material 1 or 5.0 mm or less.
- the lower limit value of the overhang amount H of the overhang portion 2 is not particularly limited, and may be any value as long as it can overhang more than 0 mm and shear.
- the lower limit value of the overhang amount H is preferably 1 mm or more, more preferably 3 mm or more in consideration of ease of shearing.
- the limit of deformation of the stretch flange is improved by performing the double cutting process based on the present invention on the portion where the end crack may occur due to the deformation of the stretch flange (see Examples).
- the present embodiment it is possible to prevent the occurrence of a restriction on the shape of the component and prevent the end portion cracking due to the deformation of the stretch flange.
- FIG. 2 which is an example of conventional processing
- a cutting position (right side) shown by a dashed line in FIG. Since it is cut at the cutting position), the cutting area formed by the width W1 of the cutting portion and the amount of protrusion H1 from the cutting position is large.
- a partial beam-like overhanging portion 2 is formed by the first cutting (cutting at the position of the one-dot chain line in FIG. 1A),
- the cutting area formed by the width W of the cutting portion and the overhang amount H in the second cutting is small (Fig. 1(b)( See c)).
- the partial cantilever-shaped overhanging portion 2 is formed by the first cutting, thereby cutting the second cantilever (overhanging portion 2).
- the width W of the cut portion is significantly smaller and it projects like a cantilever as shown in FIG.
- the present invention is suitable for high-strength steel sheets having tensile strength of 590 MPa or more, for example.
- the material of the blank 1 is not limited to steel, but can be applied to iron alloys such as stainless steel, and also to non-ferrous materials and non-metallic materials.
- the pressed part 10 manufactured in the present embodiment is suitable as, for example, an automobile part, but the present invention can be applied not only to an automobile part but to all processes of press-forming a plate material.
- the target press component 10 is manufactured by one-step press molding.
- the target pressed part is manufactured through two or more press moldings (a plurality of pressing steps).
- the press molding in which stretch flange cracking occurs is not always the final step.
- stretch flange cracks may individually occur in two or more stages of press forming.
- the above-mentioned two times The cutting process may be performed before the press molding of the fourth stage.
- FIG. 3 shows an example of manufacturing a target press part (see Fig. 3(e)) by multi-step press molding.
- FIGS. 3(b) and 3(e) are the shapes after press molding, respectively, and there is a crack concern part 3 in the press part in the press molding into the shape of FIG. 3(e).
- a portion is included at a position including a portion where end cracking may occur.
- Cutting is performed so that a beam-like overhanging portion 2 is formed, and the second cutting is performed to cut the overhanging portion 2 and a contour shape of a target edge as shown in FIG. 3D. And After that, the second press molding is performed (see FIG. 3E). As a result, edge cracks in the crack concern portion 3 are suppressed.
- the double cutting process of the present invention can be applied even to burring as shown in FIGS. 4 and 5.
- the punching process is performed by the double cutting process.
- the first cutting is performed so that the beam-shaped overhanging portion 2 is formed at a position including a portion where end cracking may occur in the end of the hole 16 (FIG. 4B, FIG. b)).
- a second cutting is performed to cut the beam-shaped overhanging portion 2 (FIGS. 4C and 5C). After that, burring is performed on the portion of the hole 16 (FIGS.
- Reference numeral 17 is a hole position after burring.
- the cold rolled material has an anisotropic tendency to be easily cracked in two directions and the hot rolled material has a tendency to be easily cracked in the C direction.
- the bulging portion 2 may be formed at the end portion where the cracking concern portion 3 exists by the burring.
- the double cutting process is not limited to the above-described trim process before press molding, and the first cutting and the second cutting may be performed independently of the trim process as the double cutting process.
- the second cutting processing is performed before at least one press molding in the press molding steps. May be configured to be executed.
- the cutter used for shearing is not particularly limited, and conventionally known equipment may be used.
- the clearance C which is a ratio of the ratio (d/t) of the gap d between the upper blade and the lower blade to the plate thickness t of the material to be pressed (d/t), is preferably 5.0% or more and 30.0% or less. ..
- clearance C is less than 5.0%, a secondary sheared surface is generated during shearing, which is not preferable as the state of the sheared end surface. In addition, the tensile residual stress may increase. On the other hand, when the clearance C is 30.0% or more, burrs of a predetermined amount or more are generated on the sheared end face, and the formability of the sheared end face may be significantly impaired. Furthermore, since a non-uniform deformation stress is applied to the machined surface by the end of the shearing process, the tensile residual stress after the shearing process may increase. More preferable clearance C is 10.0% or more and less than 20.0%.
- a process of cutting the entire circumference of the hole twice is executed as shown in FIG.
- a plate material having a tensile strength of 590 MPa and a thickness of 3.6 mm was used as the test piece 20.
- the entire circumference of the hole was cut twice as described above, and the punched hole 20B after the second cutting was used as a hole having a diameter of 10 mm (target contour shape) (see FIG. 6B).
- the diameter of the punched hole 20A formed by the first cutting was changed at a pitch of 0.5 mm in the range of 0 to 9 mm to adjust the second cutting amount (cutting margin).
- the second cutting amount (cutting margin) is set to 2 mm.
- the diameter of the first punched hole 20A is 0 mm, which corresponds to the case where a hole having a diameter of 10 mm (target contour shape) is formed by cutting once.
- the hole 20B for the second cutting was made a hole having a diameter of 10 mm (target contour shape) (see FIG. 7(b)).
- the diameter of the hole 20A formed by the first cutting was set to 10 mm, and the overhanging portion 20C as shown in FIG. 7A was formed by the first cutting.
- the process of cutting the overhanging portion 20C in the second cutting was executed.
- the overhanging amount H of the overhanging portion 20C was changed in the range of 0.5 to 5.0 mm at a 0.5 mm pitch to adjust the second cutting amount (overhanging amount).
- the exception was the same condition as the comparative example.
- the cutting amount (pulling margin) of the comparative example is illustrated as the overhang amount on the horizontal axis.
- ⁇ represents an example, and the clearance C is set to 12.5%.
- ⁇ and ⁇ are comparative examples, ⁇ is the clearance C set to 12.5%, and ⁇ is the clearance C set to 5.0%.
- the second cutting amount (the hole diameter of the second cutting minus the hole diameter of the first cutting) is It was found that the hole expansion rate ( ⁇ ) decreased as the area of the cut portion increased. On the other hand, as can be seen from FIG. 8, in the example, the hole expansion rate was almost the same regardless of the overhang amount H of the overhang portion 2.
- the average value position of the hole expansion ratio in the example is shown by a horizontal line.
- the hole expansion rate ( ⁇ ) is improved only with a very limited cutting amount (overhanging amount) in the double cutting process like the comparative example (double cutting without providing a partial overhang portion). I didn't. Then, as shown in FIG. 8, when the cutting amount (overhanging amount) exceeds 2 mm, only the same effect as the once cutting method was obtained.
- the second cutting process according to the present invention after the opening is formed so that the partial cantilever-shaped overhanging portion 20C is formed by the first cutting, the second cutting is performed. It was found that cutting the overhanging portion 20C improves the hole expansion rate ( ⁇ ) over a wide range of overhanging amount. That is, in the present example, the hole expansion rate was within the range indicated by Y in FIG. Further, it has been found that, according to the present invention, it is possible to easily suppress end cracking due to deformation of the stretch flange.
Abstract
Description
例えば、特許文献1では、プレス金型によって余肉を付与する方法が提案されている。しかし、特許文献1の方法は、その効果が限定的である。
また、特許文献2では、伸びフランジ割れの発生し難いブランク形状を用いることが提案されている。しかし、特許文献2の方法は、ブランク形状が制約されることから、製品形状の自由度が制約される。
また、特許文献3は、割れ発生部の端面の状態を改善する方法であるが、金属板の打抜き加工によって生じる打抜き端面の伸びフランジ性向上が目的であり、製品外周の伸びフランジ部には適用できない。また、非特許文献1に記載の2度抜きによる削り抜き法も、同様に打抜き加工の技術であり、製品外周の伸びフランジ部には適用できない。
本実施形態のプレス部品の製造方法は、1又は2以上のプレス成形を経て目的のプレス部品を製造するプレス部品の製造方法である。各プレス成形でのプレス成形は、例えば、フォーム成形若しくはドロー成形で行われる。そして、本実施形態のプレス部品の製造方法は、少なくとも1つのプレス成形で、板端縁に沿って伸び変形する伸びフランジ変形が発生する場合の技術である。
本実施形態では、説明を簡易にするため、一回のプレス成形(一回のプレス工程)で、図1(d)に示す形状のプレス部品10を製造する場合を例に挙げて説明する。
本例では、本発明を適用しないプレス成形を実施した場合(図2のように図1の(b)の工程を省略した場合)、フランジ部13の一部に伸びフランジ変形による端部割れが懸念される割れ懸念部があるとする。なお、図1(d)中、符号3は、割れ懸念部の位置を示し、図2(d)中、符号3′は、実際に端部割れが発生した割れ懸念部に対応する位置を示す。図1(b)、図1(c)、図2(c)における符号3Aは、被プレス材での割れ懸念部3の位置を示している。また符号1Aは、被プレス材1における、フランジ部13となる領域に相当するフランジ対応部を示している。
プレス成形を行う前処理として、被プレス材を例示するブランク材1の外周を、プレス部品10の部品形状に応じた輪郭形状にせん断するトリム工程を有する。
但し、本実施形態では、このトリム工程において、伸びフランジ変形による端部割れが懸念されるフランジ部13に相当するフランジ対応部の端部(少なくとも割れ懸念部3の位置)に対し、図1の(b)及び(c)に示すような、本発明に基づく2度の切断を実行する2度切断処理を施す。
すなわち、本実施形態では、トリム工程で、ブランク材1を目的の輪郭形状に切断する際に、フランジ対応部1Aの辺(端縁)については、割れ懸念部3Aを含む位置に、部分的に片持ち梁状に張り出した張出部2を有する形状に一旦切断する。続いて、2度目の切断でその張出部2を切断して、目的の輪郭形状とする。このように、従来の処理を示す図2の(c)の切断処理が、本実施形態では、図1の(b)及び(c)の2工程で実行される。図1の(b)及び(c)の工程を一工程で実行してもよい。
ここで、張出部2の幅W(材料の端縁に沿った長さ)は、フランジ部13の端縁に沿った長さLの1/3以下、若しくはブランク材1の板厚の150倍以下とすることが好ましい。
1度目の切断(せん断)で、上記の幅Wからなる一時的な梁状の張出部2を形成することで、梁状の張出部2を一時的に形成しない場合(図2参照)に比べて、2度目の切断(せん断)の切断量(抜き代)を稼ぎつつ、割れ懸念部3へのせん断による歪入力を、より確実に抑制することができる(後述の実施例を参照)。
また張出部2の張出量H(目的の輪郭位置からの張出量(突出量)の最大値)は、ブランク材1の板厚の10倍以下若しくは5.0mm以下が好ましい。
2度目の切断部分を片持ち梁状の張出部2とすることで、2度目の切断(せん断)の切断量(抜き代)を稼ぎつつ、割れ懸念部3へのせん断による歪入力をより確実に抑制することができる。
そして、以上の2度切断処理の後に、プレス成形で目的とするプレス部品10を製造する。
上記の2度切断処理を端部割れが懸念されるプレス成形の前処理として行うことで、通常のプレス成形を使用し且つ部品形状に制約を加えること無く、伸びフランジ変形による割れ懸念部3での割れを防止することができる。
一般に、せん断加工を行うと、被プレス材の端縁に対し若干の曲げと共に歪が入力される。このため、その後のプレス成形として、フランジ部13の端縁に沿ったフランジ部13の端部13aに対し伸びフランジ変形が発生するようなプレス成形を実行すると、端部割れが発生する可能性が高くなる傾向にある。
ここで、従来処理の例である図2に示すように、1度のせん断による切断でフランジとなる位置の端部を形成する場合、図2(a)で示す一点鎖線で示す切断位置(右側の切断位置)で切断されることから、切断部の幅W1と切断位置からの張出量H1からなる切断面積が大きい。
例えば、5段階のプレス成形を経て目的のプレス部品を製造する際に、CAEなどのシミュレーションで、4段階目のプレス成形で伸びフランジ割れの懸念があると推定した場合には、上述の2度切断処理を4段階目のプレス成形よりも前に実施すればよい。
このとき、穴16の端部のうち端部割れが懸念される箇所を含む位置に梁状の張出部2を形成するように1度目の切断を行う(図4(b)、図5(b))。その後、2度目の切断を行って、梁状の張出部2を切断する(図4(c)、図5(c))。
その後に、穴16の部分にバーリングを行って(図4(d)、図5(d))、穴の縁を立ち上げる。符号17がバーリング後の穴位置である。ここで、冷延材は2方向へ、熱延材はC方向に割れやすい異方性の傾向がある。上記のバーリングで割れ懸念部3が存在する端部に上記の張出部2を形成すればよい。
また、せん断に使用するカッターについて特に限定は無く、従来公知に設備を使用すればよい。例えば、被プレス材の板厚tに対するカッターの上刃と下刃の隙間dの比(d/t)の100分率である、クリアランスCは、5.0%以上30.0%以下が好ましい。
一方、クリアランスCが30.0%以上である場合、せん断端面に所定以上のバリが発生し、せん断端面の成形性を大きく損なうおそれがある。更に、せん断加工終了までに加工面に不均一な変形応力が付与されるため、せん断加工終了後の引張残留応力が大きくなるおそれがある。
より好ましいクリアランスCは10.0%以上かつ20.0%未満である。
以下の例では、本発明の効果を確認するために穴広げ試験を実行した。
このとき、本発明に基づき、1度目の切断で部分的な張出部を設け2度目の切断で張出部を切断する2度切断処理を実行した場合(実施例)と、本発明に基づく部分的な張出部を設けないでフランジ端部全体を2度切断する処理を実行した場合(比較例)とで、それぞれ穴広げ率を求めてみた。
この比較例の試験では、試験片20として引張強度が590MPaの材料で厚さ3.6mmの板材を使用した。そして、上記のように穴全周を2度切断し、2度目の切断後の抜き穴20Bを直径10mmの穴(目標の輪郭形状)とした(図6(b)参照)。そして、1度目の切断で形成する抜き穴20Aの直径を0~9mmの範囲において0.5mmピッチで変更して、2度目の切断量(抜き代)を調整した。例えば、1度目の切断で形成する抜き穴20Aの直径が8mmであれば、2度目の切断量(抜き代)は、2mmとした。なお、1度目の抜き穴20Aの直径が0mmとは、一度の切断で直径10mmの穴(目標の輪郭形状)を形成した場合に対応する。
ここで、図8中、比較例の切断量(抜き代)を、横軸の張出量として図示した。
また、図8中、○が実施例であり、クリアランスCを12.5%に設定したものである。また、△及び□が比較例であり、△は、クリアランスCを12.5%に設定したもので、□はクリアランスCを5.0%に設定したものである。また、図8中、張出量=0でのプロットは、従来の1度切切断方法の場合に対応する。
一方、図8から分かるように、実施例では、張出部2の張出量Hに関係なく、ほぼ同じ穴広げ率となっていた。図8に、実施例における穴広げ率の平均値位置を横線で示す。
これに対し、本発明に基づく2度切断処理の場合、1度目の切断で、部分的な片持ち梁状の張出部20Cが形成されるように開口を形成した後に、2度目の切断でその張出部20Cを切断すると広範囲の張出量において穴広げ率(λ)が向上することが分かった。すなわち、本実施例では、図8中、Yで示す範囲に穴広げ率が収まった。
そして、本発明に基づく場合、伸びフランジ変形による端部割れを簡易に抑制できることが分かった。
1A フランジ対応部
2、20C 張出部
3、3A 割れ懸念部
10 プレス部品
13 フランジ部
H 張出量
W 幅
Claims (7)
- 1又は2以上のプレス成形を経てプレス部品を製造するプレス部品の製造方法において、
上記1又は2以上のプレス成形のうちの少なくとも1つのプレス成形で、被プレス材の端部に伸びフランジ変形による端部割れが懸念されると推定される場合、上記端部割れが懸念されるプレス成形の前処理として、上記端部割れが懸念される箇所を少なくとも含む端部の切断処理を2度行う2度切断処理を有し、
上記2度切断処理は、1度目の切断の際に、上記端部割れが懸念される箇所を含む位置に部分的な梁状の張出部を形成する切断を行い、2度目の切断で上記張出部を切断することを特徴とするプレス部品の製造方法。 - 上記張出部の幅は、上記端部割れが懸念されるフランジ部の端縁の長さの1/3以下の長さとすることを特徴とする請求項1に記載したプレス部品の製造方法。
- 上記張出部の幅は、上記被プレス材の板厚の150倍以下とすることを特徴とする請求項1に記載したプレス部品の製造方法。
- 上記張出部の張出量は、上記被プレス材の板厚の10倍以下とすることを特徴とする請求項1~請求項3のいずれか1項に記載したプレス部品の製造方法。
- 上記張出部の張出量は、5.0mm以下とすることを特徴とする請求項1~請求項3のいずれか1項に記載したプレス部品の製造方法。
- 上記プレス成形は、フォーム成形又はドロー成形であることを特徴とする請求項1~請求項5のいずれか1項に記載したプレス部品の製造方法。
- 1又は2以上のプレス成形を経てプレス部品となるブランク材の製造方法において、
上記1又は2以上のプレス成形のうちの少なくとも1つのプレス成形で、被プレス材の端部に伸びフランジ変形による端部割れが懸念されると推定される場合、上記端部割れが懸念される箇所を少なくとも含む端部の切断処理を2度行う2度切断処理を有し、
上記2度切断処理は、1度目の切断の際に、上記端部割れが懸念される箇所を含む位置に部分的な梁状の張出部を形成する切断を行い、2度目の切断で上記張出部を切断することを特徴とするブランク材の製造方法。
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MX2021009168A MX2021009168A (es) | 2019-01-31 | 2020-01-20 | Metodo para la fabricacion de componente prensado, y metodo para la fabricacion de material virgen. |
JP2020521392A JP6747631B1 (ja) | 2019-01-31 | 2020-01-20 | プレス部品の製造方法及びブランク材の製造方法 |
KR1020217023599A KR102479611B1 (ko) | 2019-01-31 | 2020-01-20 | 프레스 부품의 제조 방법 및 블랭크재의 제조 방법 |
EP20747762.1A EP3919198A4 (en) | 2019-01-31 | 2020-01-20 | METHOD OF PRODUCTION OF A PRESSED COMPONENT AND METHOD OF PRODUCTION OF A BLANK |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0947826A (ja) * | 1995-07-31 | 1997-02-18 | Jidosha Kiki Co Ltd | 打抜き加工方法 |
JP2008119736A (ja) | 2006-11-14 | 2008-05-29 | Kobe Steel Ltd | プレス成形金型装置およびプレス成形方法 |
JP4959605B2 (ja) | 2008-03-07 | 2012-06-27 | 新日本製鐵株式会社 | プレス成形方法およびプレス成形用素板 |
JP5387022B2 (ja) | 2008-03-24 | 2014-01-15 | 新日鐵住金株式会社 | 面取りダイを用いた打ち抜き加工方法及び金属板伸びフランジ加工用穴打ち抜き装置 |
WO2014185428A1 (ja) * | 2013-05-13 | 2014-11-20 | 新日鐵住金株式会社 | ブランク、成形板、プレス成形品の製造方法及びプレス成形品 |
CN207103550U (zh) * | 2017-08-16 | 2018-03-16 | 广州海洋汽车零部件有限公司 | 一种改进型汽车钣金件复合切边模 |
JP2019015238A (ja) | 2017-07-07 | 2019-01-31 | トヨタ自動車株式会社 | 内燃機関のシリンダヘッド |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MY172070A (en) * | 2012-09-27 | 2019-11-13 | Nippon Steel Corp | Method for producing center pillar reinforcement |
JP6046468B2 (ja) * | 2012-11-29 | 2016-12-14 | 株式会社三井ハイテック | 打ち抜き製品のシェービング加工方法、製造方法および製造装置 |
JP5765496B2 (ja) * | 2013-07-19 | 2015-08-19 | Jfeスチール株式会社 | プレス成形方法およびプレス成形部品の製造方法 |
US10828685B2 (en) * | 2014-05-14 | 2020-11-10 | Nippon Steel Corporation | Blank, and pressed article manufacturing method |
KR102023541B1 (ko) * | 2015-08-28 | 2019-09-20 | 제이에프이 스틸 가부시키가이샤 | 신장 플랜지 성형 부품의 제조 방법 |
CN108698104B (zh) * | 2016-02-16 | 2019-12-06 | 杰富意钢铁株式会社 | 冲压成型品的制造方法 |
-
2020
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0947826A (ja) * | 1995-07-31 | 1997-02-18 | Jidosha Kiki Co Ltd | 打抜き加工方法 |
JP2008119736A (ja) | 2006-11-14 | 2008-05-29 | Kobe Steel Ltd | プレス成形金型装置およびプレス成形方法 |
JP4959605B2 (ja) | 2008-03-07 | 2012-06-27 | 新日本製鐵株式会社 | プレス成形方法およびプレス成形用素板 |
JP5387022B2 (ja) | 2008-03-24 | 2014-01-15 | 新日鐵住金株式会社 | 面取りダイを用いた打ち抜き加工方法及び金属板伸びフランジ加工用穴打ち抜き装置 |
WO2014185428A1 (ja) * | 2013-05-13 | 2014-11-20 | 新日鐵住金株式会社 | ブランク、成形板、プレス成形品の製造方法及びプレス成形品 |
JP2019015238A (ja) | 2017-07-07 | 2019-01-31 | トヨタ自動車株式会社 | 内燃機関のシリンダヘッド |
CN207103550U (zh) * | 2017-08-16 | 2018-03-16 | 广州海洋汽车零部件有限公司 | 一种改进型汽车钣金件复合切边模 |
Non-Patent Citations (2)
Title |
---|
JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 10, no. 104, September 1969 (1969-09-01) |
See also references of EP3919198A4 |
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