WO2021229254A1 - 逐次成形用工具 - Google Patents

逐次成形用工具 Download PDF

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Publication number
WO2021229254A1
WO2021229254A1 PCT/IB2020/000524 IB2020000524W WO2021229254A1 WO 2021229254 A1 WO2021229254 A1 WO 2021229254A1 IB 2020000524 W IB2020000524 W IB 2020000524W WO 2021229254 A1 WO2021229254 A1 WO 2021229254A1
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WO
WIPO (PCT)
Prior art keywords
sequential
hard film
hard
jis
less
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.)
Ceased
Application number
PCT/IB2020/000524
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
内山典子
三輪紘敬
渡辺秀徳
南部俊和
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.)
Renault SAS
Nissan Motor Co Ltd
Original Assignee
Renault SAS
Nissan 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 Renault SAS, Nissan Motor Co Ltd filed Critical Renault SAS
Priority to EP20935308.5A priority Critical patent/EP4151332B1/en
Priority to CN202080100755.2A priority patent/CN115551654A/zh
Priority to PCT/IB2020/000524 priority patent/WO2021229254A1/ja
Priority to JP2022522077A priority patent/JP7300096B2/ja
Priority to US17/924,773 priority patent/US11819900B2/en
Publication of WO2021229254A1 publication Critical patent/WO2021229254A1/ja
Anticipated expiration legal-status Critical
Ceased 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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/01—Selection of materials

Definitions

  • the present invention relates to a sequential forming tool, and more particularly to a rod-shaped sequential forming tool used as a fixed pressing tool and / or a moving pressing tool of a sequential forming apparatus.
  • Pressing using a die is widely used as a plastic working method for mass-producing automobile parts.
  • the sequential molding method is known as a molding method that does not require a mold and can produce a molded product having a complicated shape.
  • the sequential molding method is a molding method in which a rod-shaped sequential molding tool is relatively moved while being pressed against a metal plate whose periphery is fixed by a support frame, and the metal plate is stretched and molded into a predetermined three-dimensional shape.
  • lubricating oil is generally supplied to the machined surface in order to prevent the metal plate and the sequential forming tool from adhering to each other.
  • Patent Document 1 by sequentially forming the surface of a metal plate while locally melting it, adhesion between the metal plate and the sequential forming tool is prevented without supplying lubricating oil to the machined surface, and the machined surface is formed. It is disclosed that a smooth molded product can be obtained without being roughened.
  • the present invention has been made in view of the problems of the prior art, and the object thereof is without adding equipment for preventing adhesion between the metal plate and the sequential forming tool. It is an object of the present invention to provide a sequential molding tool capable of obtaining a molded product having a smooth machined surface.
  • the present inventor may refer to a hard film (hereinafter referred to as "hard film") containing crystalline carbon in a portion where a metal plate of a sequential forming tool is pressed. ) Shall be provided, and the above object can be achieved by keeping the surface roughness within a desired range, and the present invention has been completed.
  • hard film a hard film containing crystalline carbon in a portion where a metal plate of a sequential forming tool is pressed.
  • the sequential forming tool of the present invention includes a holding portion attached to the sequential forming apparatus and a free curved surface portion for pressing the metal plate.
  • the free curved surface portion is made of at least a hard metal base material, and has a hard film containing crystalline carbon on the surface thereof.
  • the surface of the hard film has an Rpk (average height of protruding peaks) of 0.15 ⁇ m or less specified by JIS B 0671 and obtained from the load curve of the roughness curve, and is specified by JIS B 0601 and obtained from the roughness curve.
  • Ra (arithmetic mean roughness) to be obtained is 0.2 ⁇ m or less.
  • a hard film containing crystalline carbon is formed on a free curved surface portion that presses a metal plate, and the surface roughness thereof is within a desired range. Therefore, equipment for preventing adhesion is provided. It is possible to provide a sequential molding tool that can obtain a molded product having a smooth machined surface without addition.
  • the sequential forming tool of the present invention is a rod-shaped tool used as a fixed pressing tool 101 and / or a moving pressing tool 103 of the sequential forming apparatus 100 shown in FIG.
  • this sequential forming tool includes a holding portion 11 attached to the sequential forming apparatus 100 and a free curved surface portion 12 for pressing a metal plate, and the free curved surface portion 12 is at least a hard metal base. It is made of a material 13 and has a hard film 14 containing crystalline carbon on its surface.
  • the sequential forming tool of the present invention has a free curved surface portion formed by combining a plurality of linear shapes, and unlike a cutting tool formed by a simple linear shape such as a straight line or a spiral, it has a metal plate.
  • the contact area is large and the load is very large.
  • the surface shape of the free-form surface portion in contact with the metal plate to be processed has a great influence not only on the surface quality of the metal plate but also on the life (load bearing capacity) of the sequential forming tool itself.
  • the surface shape of the free curved surface portion is important.
  • Rpk average height of protruding peaks
  • Rpk average height of protruding peaks
  • Rpk average height of the protruding mountain portion
  • Ra average height of the protruding mountain portion
  • Ra average height of the protruding mountain portion
  • Ra average height of the protruding mountain portion
  • Ra (arithmetic mean roughness) is a part of the roughness curve extracted with a reference length and the unevenness state of the section is represented by an average value, and one step of the roughness curve is a measured value. It has a small effect on the surface roughness and can most accurately represent the properties of surface roughness over a wide range.
  • the sequential forming tool having a hard film on the surface has high wear resistance, so that the large protruding convex portion is hard to wear, and the machined surface is scratched for a long period of time.
  • the Ra absolute mean roughness
  • the average height of the protruding mountain portion above the core portion of the load curve of the roughness curve is represented.
  • the sequential forming tool having an Rpk (average height of protruding peaks) of the hard film surface of 0.15 ⁇ m or less selectively grinds the large protruding peaks on the hard film surface. It can be made by aligning the heights of the mountains.
  • the large protruding mountain portion is selectively arranged with abrasive grains of a constant size by using a polishing sheet of fixed abrasive grains having the same height of the abrasive grains. Can be ground.
  • the abrasive grains may aggregate to form a large abrasive grain mass, and it is difficult to uniformly disperse the abrasive grains. Since it is not possible to completely eliminate the bias of the abrasive grains, it is difficult to make the heights of the ridges on the surface of the tool for sequential forming uniform.
  • a polishing sheet of fixed abrasive grains in which abrasive grains having a constant size are regularly arranged and the heights of the abrasive grains are uniform is formed from a free curved surface of a sequential forming tool. It is also sandwiched between a jig with a slightly smaller curvature (larger radius) and a tool for sequential forming. Then, as shown by an arrow in FIG. 6, the protruding mountain portion is selectively ground by moving the polishing sheet in one direction while rotating the sequential forming tool and swinging the jig. The height of the mountain was made uniform.
  • Rpk average height of protruding peaks
  • Ra arithmetic mean roughness
  • a diamond film can be used as the hard film containing crystalline carbon.
  • the diamond film is formed of synthetic diamond produced by chemical vapor deposition (CVD) using a mixed gas of hydrocarbons, and the diamond film is produced by a thermal filament CVD method or a microwave plasma CVD method. can.
  • the diamond film has a low coefficient of friction and high hardness, and can be thickened.
  • the thickness of the hard film sufficiently thicker than the unevenness of the surface of the hard metal base material, the hard metal Smoothing is possible without being affected by the unevenness of the surface of the base material.
  • the hard film which is a diamond film formed by the CVD method, has a carbon (C) content of 99% by mass or more. Even if the hard film is formed of diamond, if a metal such as cobalt (Co) or a binder such as hard ceramics is present at the interface between the diamond particles as in the diamond sintered body (PCD), the binder is a metal component. Since it has a high affinity with the metal plate, adhesion occurs and the machined surface becomes rough. When the carbon (C) content of the hard film is in the above range, the affinity with the metal plate is lowered and adhesion is prevented.
  • a metal such as cobalt (Co) or a binder such as hard ceramics
  • the diamond film is polycrystalline. Unlike single crystal diamond, polycrystalline diamond does not differ in characteristics depending on the crystal plane and crystal direction, and is isotropic. Therefore, it exhibits uniform characteristics in all directions and is resistant to forces from any direction. It is also strong and difficult to open, and has high load resistance.
  • the film thickness of the hard film is preferably 5 ⁇ m or more and 30 ⁇ m or less, and more preferably 10 ⁇ m or more and 20 ⁇ m or less. If the film thickness of the hard film is too thin, it is easy to open and the load capacity is lowered, so that it is difficult to press the metal plate sufficiently to form it. If the film thickness of the hard film is too thick, the hard film is formed. The residual stress of the hard film generated at the time of filming becomes large, and the hard film may be easily opened during sequential molding.
  • FIG. 7 shows the relationship between the film thickness of the hard film and the surface pressure for pressing the metal plate.
  • the hard metal base material may be any material as long as it has a high hardness and can form a diamond film.
  • a cemented carbide in which cobalt (Co) is mixed with tungsten carbide (WC) can be mentioned.
  • the Rpk (average height of the protruding peaks) of the free curved surface portion is preferably 0.04 ⁇ m or more, more 0.05 ⁇ m or more, further 0.08 ⁇ m or more, and even more 0.1 ⁇ m or more 0. It is preferably .25 ⁇ m or less. Further, Ra (arithmetic mean roughness) is preferably 0.15 ⁇ m or more and 0.4 ⁇ m or less.
  • the anchor effect may not be obtained and the adhesion of the hard film may be lowered to facilitate peeling. If the surface roughness is too large, the hard film may not be smooth. As the polishing time becomes longer, the actual (local) surface pressure increases at the remaining convex portion, which causes a decrease in load bearing capacity.
  • the hard metal base material can be produced by forming a free curved surface having a desired shape by polishing and then roughening the surface by acid treatment or the like.
  • the metal plate that can be formed by the sequential forming tool of the present invention is not particularly limited as long as it is plastically deformable.
  • zinc-plated steel, mild steel, high-tensile steel (high-strength steel), stainless steel, aluminum alloy, etc. Can mold metal plates.
  • Table 1 shows the relationship between the type of metal plate and the surface pressure (GPa) required for sequentially molding the metal plate.
  • Example 1 After polishing the surface of a hard metal base material (cemented carbide) containing 6% Co in a rod-shaped WC having a diameter of 20 mm to form a free curved portion having a desired shape, the free curved portion is subjected to 5% at room temperature. The surface was roughened by immersing it in an aqueous nitric acid solution for 10 minutes to elute cobalt in the hard metal substrate.
  • a hard metal base material cemented carbide
  • Abrasive grains of constant size are regularly arranged on the surface of the hard film, and a polishing sheet of fixed abrasive grains (3M Trizact diamond wrapping film) having the same height of the abrasive grains is brought into contact with the surface of the hard film.
  • the polishing sheet was backed up by pressing a jig having a curvature slightly smaller than the free curved surface of the sequential forming tool. Then, the polishing sheet was moved in one direction while shaking the jig while rotating the sequential forming tool, and polishing was performed for 12 hours to obtain a sequential forming tool.
  • Example 2 A sequential forming tool was obtained in the same manner as in Example 1 except that a diamond sintered body (PCD) was formed on the surface of a hard metal base material and polished under the conditions shown in Table 2.
  • PCD diamond sintered body
  • Rpk average height of protruding peaks
  • Ra arithmetic mean roughness
  • Load capacity A load is continuously applied to the hard film via a super hard indenter (sphere with a diameter of 6 mm), and the AE wave (Acoustic Emission) when a crack is generated due to elastic deformation of the hard film is detected as sound, and the fracture strength (withstand load). Gender) was evaluated.
  • Table 2 shows the load capacity (kN) and the maximum surface pressure (GPa) that can be loaded within the load capacity range.
  • the sequential forming tools of Examples 1 to 4 and Examples 6, 7, and 9 have a high maximum surface pressure and various surface pressures required for sequential forming of a metal plate do not cause cracks in the hard film. It was confirmed that various types of metal plates can be molded. Further, in Example 8, the surface of the hard metal base material was excessively roughened, so that the load capacity was lowered. In Comparative Example 1, since a polishing sheet having irregular heights of abrasive grains was used, the Rpk (average height of the protruding peaks) of the hard film could not be reduced to 0.15 ⁇ m or less.
  • the Ra (arithmetic mean roughness) and appearance of the molded product were evaluated as follows.
  • Table 4 shows the evaluation results of the galvanized steel sheet.
  • ⁇ No rough skin on the processed surface.
  • ⁇ There is rough skin on a part of the processed surface.
  • ⁇ There is rough skin over the entire processed surface.
  • ⁇ There is rough skin over the entire processed surface.
  • the appearance of the metal plates of mild steel, high-tensile steel (high-strength steel), stainless steel and aluminum alloy was similar to that of the metal plates of zinc-plated steel.
  • the sequential molding tool of the present invention having an Rpk (average height of protruding peaks) of 0.15 ⁇ m or less and a Ra (arithmetic mean roughness) of 0.2 ⁇ m or less is a molded product without rough skin. It can be seen that can be molded. From the comparison between Examples 5 and 6 and Comparative Example 1, it was confirmed that the presence or absence of rough skin was greatly affected by Rpk (average height of the protruding mountain portion).
  • Sequential forming tool 11 Holding part 12 Free curved surface part 13 Hard metal base material 14 Hard film 2 Polishing sheet 21 Abrasive grains 3 Jig 100 Sequential forming device 101 Fixed pressing tool 102 Moving pressing tool 103 Support frame 104 Metal plate h Abrasive grains Height

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
PCT/IB2020/000524 2020-05-14 2020-05-14 逐次成形用工具 Ceased WO2021229254A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP20935308.5A EP4151332B1 (en) 2020-05-14 2020-05-14 Incremental forming tool
CN202080100755.2A CN115551654A (zh) 2020-05-14 2020-05-14 逐次成形用工具
PCT/IB2020/000524 WO2021229254A1 (ja) 2020-05-14 2020-05-14 逐次成形用工具
JP2022522077A JP7300096B2 (ja) 2020-05-14 2020-05-14 逐次成形用工具
US17/924,773 US11819900B2 (en) 2020-05-14 2020-05-14 Sequential molding tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2020/000524 WO2021229254A1 (ja) 2020-05-14 2020-05-14 逐次成形用工具

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WO2021229254A1 true WO2021229254A1 (ja) 2021-11-18

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US (1) US11819900B2 (https=)
EP (1) EP4151332B1 (https=)
JP (1) JP7300096B2 (https=)
CN (1) CN115551654A (https=)
WO (1) WO2021229254A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023092216A (ja) * 2021-12-21 2023-07-03 日産自動車株式会社 逐次成形装置及び逐次成形方法

Citations (4)

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JP2014095392A (ja) * 2012-11-07 2014-05-22 Toyota Motor Corp 歯車およびその製造方法
JP2017051995A (ja) 2015-09-11 2017-03-16 日産自動車株式会社 逐次形成方法、逐次成形装置及び逐次形成方法用工具
JP2017217657A (ja) * 2016-06-06 2017-12-14 日産自動車株式会社 逐次成形方法及び逐次成形装置
JP2018015805A (ja) * 2016-07-29 2018-02-01 日産自動車株式会社 逐次成形用工具及びこれを用いた逐次成形方法

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JP2006144100A (ja) * 2004-11-24 2006-06-08 Nissan Motor Co Ltd 自動車エンジン用摺動部材
US7543557B2 (en) * 2005-09-01 2009-06-09 Gm Global Technology Operations, Inc. Scuff resistant aluminum piston and aluminum cylinder bore combination and method of making
JP2007313636A (ja) * 2006-04-27 2007-12-06 Kyocera Corp 切削工具およびそれを用いた被削材の切削方法
JP4954644B2 (ja) * 2006-08-31 2012-06-20 日本ピストンリング株式会社 シリンダライナとピストンリングの組み合わせ
JP5804589B2 (ja) * 2010-02-10 2015-11-04 日立金属株式会社 摺動特性に優れた被覆金型または鋳造用部材及びその製造方法
US8783078B2 (en) * 2010-07-27 2014-07-22 Ford Global Technologies, Llc Method to improve geometrical accuracy of an incrementally formed workpiece
EP2963317B1 (en) 2013-02-28 2019-03-27 Nippon Piston Ring Co., Ltd. Hard carbon coating film
US10500629B2 (en) * 2014-10-07 2019-12-10 The Penn State Research Foundation Method for reducing springback using electrically-assisted manufacturing
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014095392A (ja) * 2012-11-07 2014-05-22 Toyota Motor Corp 歯車およびその製造方法
JP2017051995A (ja) 2015-09-11 2017-03-16 日産自動車株式会社 逐次形成方法、逐次成形装置及び逐次形成方法用工具
JP2017217657A (ja) * 2016-06-06 2017-12-14 日産自動車株式会社 逐次成形方法及び逐次成形装置
JP2018015805A (ja) * 2016-07-29 2018-02-01 日産自動車株式会社 逐次成形用工具及びこれを用いた逐次成形方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023092216A (ja) * 2021-12-21 2023-07-03 日産自動車株式会社 逐次成形装置及び逐次成形方法

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Publication number Publication date
US11819900B2 (en) 2023-11-21
EP4151332A1 (en) 2023-03-22
EP4151332A4 (en) 2023-06-21
US20230191471A1 (en) 2023-06-22
JP7300096B2 (ja) 2023-06-29
EP4151332B1 (en) 2024-08-07
JPWO2021229254A1 (https=) 2021-11-18
CN115551654A (zh) 2022-12-30

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