EP3460090A1 - Oberflächenbehandlungsverfahren für metallprodukt sowie metallprodukt - Google Patents

Oberflächenbehandlungsverfahren für metallprodukt sowie metallprodukt Download PDF

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Publication number
EP3460090A1
EP3460090A1 EP17799342.5A EP17799342A EP3460090A1 EP 3460090 A1 EP3460090 A1 EP 3460090A1 EP 17799342 A EP17799342 A EP 17799342A EP 3460090 A1 EP3460090 A1 EP 3460090A1
Authority
EP
European Patent Office
Prior art keywords
metal article
ejection
nano
particles
treated
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
EP17799342.5A
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English (en)
French (fr)
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EP3460090A4 (de
Inventor
Keiji Mase
Shozo Ishibashi
Yusuke Kondo
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.)
Fuji Manufacturing Co Ltd
Original Assignee
Fuji Manufacturing 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 Fuji Manufacturing Co Ltd filed Critical Fuji Manufacturing Co Ltd
Publication of EP3460090A1 publication Critical patent/EP3460090A1/de
Publication of EP3460090A4 publication Critical patent/EP3460090A4/de
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/02—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for sharpening or cleaning cutting tools, e.g. files
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor

Definitions

  • the present invention relates to a method for surface treatment of a metal article and to a metal article subjected to surface treatment by the method.
  • the present invention relates to a surface treatment method to strengthen a surface of a metal article by ejecting fine particles against the metal article under predetermined conditions to make a crystal structure in the vicinity of the surface of the metal article to a nano-crystal structure, and to a metal article having a surface strengthened by such a method.
  • Patent Document 1 and Non-Patent Document 1 examples of surface treatment are introduced in Patent Document 1 and Non-Patent Document 1.
  • the respective conditions therein are surface treatment by ejecting shot made from high speed steel (SKH59) with an average particle diameter 45 ⁇ m at 0.5 MPa for 30 seconds against a soft material, in this case SS400 steel (HV 1.20 GPa (HV122)); and surface treatment by shot peening under the same conditions against a hard material, in this case SCr420 carburized and quenched steel (initial hardness HV 7.55 GPa (HV770)) in Patent Document 1 and Non-Patent Document 1.
  • SCr420 carburized and quenched steel initial hardness HV 7.55 GPa (HV770)
  • nano-crystal structures created in the surface of a metal article made from a hard material are reported to be generated as nano-crystal structures by a physical state and formed uniformly along the surface in a zone extending to a particular depth from the surface.
  • the nano-crystal structures accompanying such lamellar processing structures are not contiguously distributed along the surface of the metal article.
  • peripheral work-hardening regions are exposed at the surface, and sometimes the lamellar processing structures (nano-crystal structures) penetrate to positions deeper than the work-hardening regions.
  • a second objective of the present invention is to provide a surface treatment method of a metal article that is: capable of being applied commonly to metal articles spanning from those made of soft materials to those made of hard materials, irrespective of the hardness of the base metal of the metal article to be treated; and capable of forming a uniform nano-crystal structure continuously along the surface of the metal article.
  • a uniform nano-crystal structure layer can be formed continuously even on metal articles made from soft materials, in which hitherto it has not been possible to form a uniform nano-crystal structure layer continuously due to the formation of lamellar processing structures.
  • this surface treatment also imparts a high compressive residual stress equal to or higher than that imparted when large ejection particles of comparatively large particle diameter are ejected at high ejection pressure.
  • the region to be treated is a cutting-edge (edge) of a machining tool such as a cutting tool and in the vicinity of the cutting-edge
  • the equivalent diameter of dimples formed by the ejection of ejection particles onto the region to be treated is from 1 ⁇ m to 18 ⁇ m, and preferably from 1 ⁇ m to 12 ⁇ m
  • the depth of such dimples is from 0.02 ⁇ m to 1.0 ⁇ m or less than 1.0 ⁇ m
  • the projected surface area of such dimples is not less than 30% of the surface area of the region to be treated.
  • polishing may be performed by manual lapping or buffing.
  • pre-processing is preferably performed by blasting using an elastic abrasive.
  • the ejection velocity was computed with reference to ejection velocity computation equations in a paper regarding how the ejection velocity changes with respect to changes in particle diameters of ejection particles: " Measurement and Analysis of Shot Velocity in Pneumatic Shot Peening" by Ogawa, Asano, et. al (Transactions of the Japan Society of Mechanical Engineers, Edition C, Volume 60, No. 571, 1994-3 ).
  • the Von Mises stress is referenced as an indicator to determine whether or not a given material will yield. This means that there is no need to look at stress in other directions when comparing against yield stress, and yield determination is made using a single Von Mises stress. This was utilized to simulate stress arising from colliding with the ejection particles.
  • the center of the portions where a crescent shape can be seen represents the portion input with highest intensity stress.
  • An extremely high stress was imparted to portions in the vicinity of the surface in the simulation of ejection particles of 20 ⁇ m or less. However, stress is spread out and dispersed deeply as the particle diameter increases, resulting in a weaker intensity of stress (see Fig. 9 and Fig. 10 ).
  • DHT dynamic hardness
  • ⁇ an indenter shape coefficient (3.8584)
  • P the indentation load (mN)
  • D the indentation depth.
  • such ejection particles of small particle diameter have a small mass and the influence of inertia is small. There is accordingly no need for a large force to move such particles, and these ejection particles are easily carried on an ejected airflow even when the pressure of the transport gas is a low pressure. This enables the ejection particles to be ejected from the ejection nozzle easily with a velocity close to that of the compressed gas since the distance until the maximum velocity is achieved is short.
  • iron-based ejection particles having a median diameter of 20 ⁇ m employed in the above tests have a falling time through air (inverse of terminal velocity according to Stokes' Law or Stokes' equation) that is 10.6 sec/m.
  • a good rise in surface hardness (dynamic hardness) could be obtained for ejection pressures within the range of from 0.05 MPa to 0.5 MPa.
  • the required ejection velocity can be achieved as long as the falling time through air is longer than that of these ejection particles so that the ejection particles are readily carried on an airflow, enabling nano-crystallization to be obtained at the surface of the metal article.
  • the ejection velocity is not less than 80 m/sec for the above described iron-based ejection particles having a particle diameter of 20 ⁇ m.
  • the ejection particles are preferably ejected at an ejection velocity of not less than 80 m/sec.
  • test strips that had been surface treated under the conditions described above was observed by the following method.
  • SIM scanning ion microscope
  • nano-crystal structures were formed continuously along the surface of the test strips within the field of view of SIM mages (about 10 ⁇ m), and the formation of a continuous nano-crystal structure layer was confirmed.
  • test strips formed in this manner with a nano-crystal structure layer in the vicinity of surface had, as explained with reference to Fig. 11 , a surface hardness (dynamic hardness) is increased by about 100 to 200 compared to untreated test strips (indicated at ejection pressure 0 MPa in Fig. 11 ). This confirmed that the effectiveness as a method for strengthening surfaces of metal articles formed from various materials from soft materials through to hard materials.
  • the results obtained from EBSD analysis indicated a crystal grain diameter distribution in the vicinity of the surface of the pre-hardened steel (NAK80) test strip as illustrated in Fig. 15 , and a crystal grain diameter distribution in the vicinity of the surface of the alloy tool-steel (SKD11) test strip as illustrated in Fig. 16 .
  • the residual stress of the aluminum alloy (A7075) is illustrated in the graph of Fig. 19 .
  • This graph shows as a Comparative Example the results of residual stress measurements when ejection particles having a median diameter of 40 ⁇ m, this being larger than the range of the present invention, were ejected at an ejection pressure of 0.5 MPa.
  • SF for "Ejection method” in Table 5 indicates a suction ejection method employing a "SFK-2" manufactured by Fuji Manufacturing Co., Ltd. as the blasting apparatus in these test examples.
  • Example 1 Hardly any observable damage. No occurrences of accumulation of material to be processed.
  • Example 2 Hardly any observable damage. No occurrences of accumulation. Comparative Example 1 Multiple scratches having a striation shape along the length direction observed. Some accumulations of material to be processed were occurred. Untreated punch Unusable after 1800 cycles.
  • performing the surface treatment of the present invention on punches made from SKD11 was seen to raise hardness, from a surface hardness of about 750 Hv when untreated to a hardness of about 950 Hv after surface treatment by the treatment of Example 1, that is, an uplift in hardness of about 21%.
  • Example 2 Moreover, the treatment of Example 2 was seen to raise hardness to about 870 Hv, that is, an uplift in hardness of about 16%.
  • the punches treated with the surface treatment method according to the present invention were capable of preventing material to be processed from accumulating to the cutting-edge as described above. This is thought to be a reason why good punching performance was exhibited over a prolonged period of time, and a reason why the lifespan of the punches was raised.
  • the "Multi-File Analysis Application” is an application that uses data measured by a laser microscope to measure surface roughness, line roughness, height and width, etc.
  • the application analyzes the equivalent circular diameter, depth, and the like, sets a reference plane, and is capable of performing image processing such as height inversion.
  • the "reference plane” described above indicates a flat plane at the origin (reference) measurement for height data, and is employed mainly to measure depth, height, etc. in the vertical direction.
  • Example 3 Three types of flat sheets of SUS304, size 40 mm ⁇ 40 mm and thickness 2 mm, were prepared: sheets treated by the present invention (Example 3); untreated sheets having a mirror finish (Comparative Example 2); and sheets treated by related art (Comparative Example 3). The slidability of the sheets was then evaluated by friction-wear tests.
  • Table 7 Surface Treatment Conditions Example 3 Comparative Example 3 Ejection method SF SF Ejection particle Median diameter D 50 ( ⁇ m) Ferrous alloy (Median diameter D 50 :20 ⁇ m) HSS (Median diameter D 50 :40 ⁇ m) Ejection pressure (MPa) 0.1 0.3 Nozzle diameter (mm) 7 7 Ejection duration (sec) 20 20
  • a ball-on-disc friction-wear tester was employed.
  • a ball of 3/16 inch diameter made from SUS304 was employed therein.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
EP17799342.5A 2016-05-20 2017-05-15 Oberflächenbehandlungsverfahren für metallprodukt sowie metallprodukt Pending EP3460090A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016101655A JP6307109B2 (ja) 2016-05-20 2016-05-20 金属成品の表面処理方法及び金属成品
PCT/JP2017/018229 WO2017199918A1 (ja) 2016-05-20 2017-05-15 金属成品の表面処理方法及び金属成品

Publications (2)

Publication Number Publication Date
EP3460090A1 true EP3460090A1 (de) 2019-03-27
EP3460090A4 EP3460090A4 (de) 2019-11-20

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EP17799342.5A Pending EP3460090A4 (de) 2016-05-20 2017-05-15 Oberflächenbehandlungsverfahren für metallprodukt sowie metallprodukt

Country Status (6)

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US (1) US20190076987A1 (de)
EP (1) EP3460090A4 (de)
JP (1) JP6307109B2 (de)
KR (1) KR102173928B1 (de)
CN (1) CN109154057B (de)
WO (1) WO2017199918A1 (de)

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JP6840637B2 (ja) * 2017-07-28 2021-03-10 株式会社不二製作所 硬脆性材料表面に対する微小ディンプルの形成方法
JP6892415B2 (ja) * 2018-07-20 2021-06-23 株式会社不二機販 食品接触部材の表面処理方法
JP6773342B2 (ja) * 2019-03-06 2020-10-21 株式会社不二製作所 Ｄｌｃ被覆部材の表面処理方法
CN112372514B (zh) * 2020-09-29 2022-12-27 广东工业大学 一种刀具刃口加工方法

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JP2002036115A (ja) * 2000-07-31 2002-02-05 Sintokogio Ltd ショットピ−ニング処理方法及びその被処理品
JP3879059B2 (ja) * 2002-01-07 2007-02-07 財団法人理工学振興会 ナノ結晶構造金属材料の製造方法及びナノ結晶構造金属材料
JP2005001088A (ja) * 2003-06-13 2005-01-06 Osg Corp 硬質被膜被覆部材、およびその製造方法
EP1707306B1 (de) * 2004-01-21 2012-09-26 Toyohashi University of Technology Verfahren zur herstellung einer ultrafeinen kristallschicht auf einer metallischen oberfläche, durch bohren
JP2007297651A (ja) 2006-04-27 2007-11-15 Fuji Wpc:Kk 硬質金属表面における結晶粒微細化方法
JP5225596B2 (ja) * 2007-03-15 2013-07-03 株式会社不二Ｗｐｃ 熱間金型用合金鋼の強化方法及び該方法による熱疲労き裂の発生を抑止して成る熱間金型用合金鋼
JP5171082B2 (ja) * 2007-03-23 2013-03-27 株式会社不二製作所 被膜形成部の下地処理方法
JP5086756B2 (ja) * 2007-10-05 2012-11-28 三菱重工業株式会社 金属部材の補修方法
JP3150048U (ja) * 2008-12-10 2009-04-30 株式会社不二機販 ステンレス，チタン又はチタン合金から成る高耐食性金属部品
JP5338647B2 (ja) * 2009-12-14 2013-11-13 大豊工業株式会社 摺動部材の製造方法と摺動部材
JP5749026B2 (ja) * 2010-04-09 2015-07-15 山陽特殊製鋼株式会社 ショットピーニング用高硬度投射材
US8893538B2 (en) * 2010-12-08 2014-11-25 Fuji Kihan Co., Ltd. Instantaneous heat treatment method for metal product
JP6274743B2 (ja) * 2013-04-30 2018-02-07 山陽特殊製鋼株式会社 高い圧縮残留応力を得るショットピーニング方法

Also Published As

Publication number Publication date
CN109154057B (zh) 2021-08-13
EP3460090A4 (de) 2019-11-20
US20190076987A1 (en) 2019-03-14
WO2017199918A1 (ja) 2017-11-23
KR20190007052A (ko) 2019-01-21
JP2017206761A (ja) 2017-11-24
KR102173928B1 (ko) 2020-11-04
JP6307109B2 (ja) 2018-04-04
CN109154057A (zh) 2019-01-04

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