EP1502967A1 - Method for making a blade and blade manufactured thereby - Google Patents

Method for making a blade and blade manufactured thereby Download PDF

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Publication number
EP1502967A1
EP1502967A1 EP04290527A EP04290527A EP1502967A1 EP 1502967 A1 EP1502967 A1 EP 1502967A1 EP 04290527 A EP04290527 A EP 04290527A EP 04290527 A EP04290527 A EP 04290527A EP 1502967 A1 EP1502967 A1 EP 1502967A1
Authority
EP
European Patent Office
Prior art keywords
blade
weight
matter
specific gravity
powder
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.)
Withdrawn
Application number
EP04290527A
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German (de)
English (en)
French (fr)
Inventor
Kusanagi Ryota
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1502967A1 publication Critical patent/EP1502967A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B25/00—Hand cutting tools involving disc blades, e.g. motor-driven

Definitions

  • the present invention relates to blades of cooking knives or of various shapes including a circular one and, more particularly, to blade materials constituted by light alloy having a high hardness, and a manufacturing method thereof.
  • blades In cooking knives, common knives, circular spin knives, and shavers with various shapes, blades (cutters) are generally processed first by punching a rolling steel plate. Next, the steel plate is subject to heat treatment and hardening in order to form the blade.
  • the first characteristic required from the conventional blade is a lasting cutting property. To achieve this characteristic, it has been carried out a method to increase the hardness of the blade material. However, there is a drawback in this method in that both the hardness and brittleness of Carbon steel increase during a quench process.
  • powder sintered blades made from Carbide Tungsten (WC) powder and Cobalt (Co) powder are heavy in specific gravity at a value between 10 to 16 depending on the compositions thereof, such that the powder sintered blades have been limited in usage.
  • Embodiments of the present invention provide a blade material and a manufacturing method thereof adapted to maintain high wear resistance, high hardness, and low specific gravity by using light alloy having a high hardness.
  • a method for making a blade and blade manufactured thereby comprises the step of preparing a powder mixture having 10-90 weight % of a first matter and 10-90 weight % of a second matter out of a total of 100 weight %, wherein the first matter is Carbide Vanadium (VC) having a specific gravity of seven or less, and the second matter is Titanium (Ti) or Titanium (Ti) alloy powder having a specific gravity of seven or less.
  • VC Carbide Vanadium
  • Ti Titanium
  • Ti Titanium
  • Ti Titanium
  • Ti Titanium alloy powder
  • Carbide Vanadium is used as a principle material for a blade in the embodiment of the present invention.
  • a sintered body of VC-Titanium (Ti) or VC-Ti alloy is therefore preferably used as a main ingredient of the blade as it can have five to six specific gravity depending on compositions thereof.
  • the sintered body is about a half or one third in specific gravity than that of WC-Co alloy having a high hardness having a value of 10-16.
  • WC-Co alloy having a high hardness contains HV1800 (HRA92) as its maximum value and a specific gravity of around 15.
  • the principal material of the present invention, VC however, has a very high hardness HV2600 and light specific gravity ranging around 7, leading to properly embody a blade material of light and high hardness.
  • VC powder having a specific gravity of seven or less is prepared at 10-90 weight % for a first matter.
  • Ti or Ti alloy powder having a specific gravity of seven or less is prepared at 10-90 weight % for a second matter.
  • the first and second matters are blended to form a powder mixture having a 100 weight %.
  • VC is prepared at 10-90 weight % because if the VC content contains a weight % of 10 or less in the total powder mixture, the wear resistance or hardness thereof is lowered. If the VC content exceeds a weight % of 90 or higher, then the VC increases in brittleness as a result of the high hardness.
  • the powder mixture of VC (first matter) and Ti powder or Ti alloy powder (second matter) is packed in a mold of a desired shape, and undergoes a press formation under a pressing force of 10t per square centimeter (cm 2 ), thereby obtaining a molded material.
  • the molded material is taken out from the mold and sintered under a temperature of 1500°C or lower, preferably under 1300°C in a vacuum furnace for obtaining a circular blade as shown in FIG. 1.
  • a blade rotatably installed at a rotating axis of a machine as a rotating spin blade is formed with an insertion hole (1) into which the rotating axis is inserted.
  • a plane part (3) is formed with a desired thickness by grinding the plane part.
  • An outer periphery cutting edge portion (2) is formed by grinding the outer periphery of the plane part (3).
  • the molded and sintered material obtains a hardness of HRA60.
  • silver powder as a third matter is added to the powder mixture of first and second matters for improving antibiosis and sanitation of the blade.
  • the blade Once the blade is added with silver, it is possible to provide antibacterial property by silver ion to the blade. Thus, it can sustain a sanitary condition even if it is contaminated by blood or animal flesh since silver ion has an antibacterial property and self-purification.
  • air holes are apt to be formed inside the structure of the sintered body.
  • the amount of the air holes occurring generally varies according to pressure applied to the powder mixture during molding.
  • the air holes inside the sintered body lower the actual density of the sintered body.
  • a cutting capability of the blade is decreased.
  • Co powder is added at 2-10 weight % to the powder mixture manufactured in the first embodiment or the second embodiment in order to overcome the aforementioned drawback.
  • the powder mixture blended with the Co powder is packed into a mold of a desired shape and pressed and then sintered under a sintering temperature.
  • the Co powder Once the Co powder is added to the powder mixture and the powder mixture is pressed and sintered, the Co powder easily melts and changes into a liquid form under the sintering temperature so as to obtain a high fluidity causing to flow into the air holes formed inside the sintered body thereby filling up the air holes.
  • the Co fills up the air holes, the air holes which lower the cutting capability of the blade are eliminated and the structure of the sintered body is increased in density as well.
  • the amount of the Co is a weight % of 2 or less, the air holes formed inside the structure of the sintered body may be insufficiently packed. If the Co exceeds a weight % of 10 or higher, then the remaining Co after packing the air holes inside the sintered body is unevenly dispersed therein causing segregation.
  • the first matter VC is the principle material of the present invention for being light and having a high hardness.
  • the second matter Ti serves as a binding material of the first matter particles for sintering the first matter particles as an overall mixture.
  • the Ti powder of the second matter can be substituted by Cobalt (Co) for being mixed, molded, and sintered with the VC powder, and obtaining a blade having light alloy having a high hardness.
  • Co Cobalt
  • the blade of the present invention has less weight and equal volume to the conventional blade, contributing to a reduction in the number of raw materials, cost, and facilitation in the manufacture thereof by miniaturizing the product.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Knives (AREA)
  • Nonmetal Cutting Devices (AREA)
EP04290527A 2003-07-28 2004-02-26 Method for making a blade and blade manufactured thereby Withdrawn EP1502967A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2003051950 2003-07-28
KR1020030051950A KR100550235B1 (ko) 2003-07-28 2003-07-28 칼날소재의 제조방법 및 그에 의한 칼날소재

Publications (1)

Publication Number Publication Date
EP1502967A1 true EP1502967A1 (en) 2005-02-02

Family

ID=33536451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04290527A Withdrawn EP1502967A1 (en) 2003-07-28 2004-02-26 Method for making a blade and blade manufactured thereby

Country Status (5)

Country Link
US (1) US20050025655A1 (ko)
EP (1) EP1502967A1 (ko)
JP (1) JP2005048276A (ko)
KR (1) KR100550235B1 (ko)
CN (1) CN1575891A (ko)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100545749B1 (ko) * 2003-10-27 2006-01-24 아키라 히라이 복층 분말소결 공구부품 및 그 제조방법
KR20050068506A (ko) * 2003-12-30 2005-07-05 아키라 히라이 칼날소재의 제조방법 및 그에 의한 칼날소재
US20060185254A1 (en) * 2005-02-18 2006-08-24 Akira Hirai Titanium coated diamond containing edge material and method for manufacturing the same
KR20090102080A (ko) * 2008-03-25 2009-09-30 가부시키가이샤 포에버 초경질 미소입자를 이용한 칼날
JP3174409U (ja) * 2011-11-29 2012-03-22 株式会社フォーエバー ダイアモンド粒子含有刃物
JP5987337B2 (ja) * 2012-02-09 2016-09-07 セイコーエプソン株式会社 カッター、裁断装置、記録装置、及びカッターの製造方法
US10555863B2 (en) * 2013-03-15 2020-02-11 Jacob Randy Hall Cryotherapy compression system
CN103334042A (zh) * 2013-06-20 2013-10-02 成都工业学院 碳化钒基硬质合金
CN105128040B (zh) * 2015-09-29 2017-11-28 山西玉华再制造科技有限公司 钛合金激光熔覆高速食品切割刀头及制造方法
KR20210042770A (ko) * 2019-10-10 2021-04-20 긴미라이 가부시키가이샤 은 제균 날붙이의 제조방법
CN112658248A (zh) * 2020-12-07 2021-04-16 技锋精密刀具（马鞍山）有限公司 一种制备圆形刀片的模具及其使用方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
US3737290A (en) * 1970-09-22 1973-06-05 Deutsche Edelstahlwerke Ag Sintered titanium alloy
DE19720706A1 (de) * 1996-05-17 1997-11-20 Ebara Corp Abriebfeste Titanlegierung
JP2000127047A (ja) * 1998-10-22 2000-05-09 Chukyo Kenma Kk 抗菌性金属ゾルの製造と加圧式加熱方法による金属被覆処理 砥石における抗菌転移性被覆処理方法

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US3802877A (en) * 1972-04-18 1974-04-09 Titanium Metals Corp High strength titanium alloys
US3945863A (en) * 1973-09-20 1976-03-23 Martin Marietta Corporation Process for treating metal powders
US4299626A (en) * 1980-09-08 1981-11-10 Rockwell International Corporation Titanium base alloy for superplastic forming
GB8408975D0 (en) * 1984-04-06 1984-05-16 Wood J V Titanium alloys
US4731115A (en) * 1985-02-22 1988-03-15 Dynamet Technology Inc. Titanium carbide/titanium alloy composite and process for powder metal cladding
CA2015213C (en) * 1990-04-23 1998-04-14 Gilles Cliche Tic based materials and process for producing same
US5545248A (en) * 1992-06-08 1996-08-13 Nippon Tungsten Co., Ltd. Titanium-base hard sintered alloy
JP2796917B2 (ja) * 1993-02-02 1998-09-10 株式会社クボタ 耐食耐摩耗性等にすぐれた非鉄金属溶湯部材用複合焼結合金
US5744254A (en) * 1995-05-24 1998-04-28 Virginia Tech Intellectual Properties, Inc. Composite materials including metallic matrix composite reinforcements
JPH10298611A (ja) * 1997-04-25 1998-11-10 Akira Hirai 抗菌性焼結刃物
EP1007750B1 (en) * 1997-08-19 2004-05-26 Titanox Developments Limited Titanium alloy based dispersion-strengthened composites
US6668460B2 (en) * 2002-01-17 2003-12-30 Jonathan Feng Corrosion resistant lock blade knife

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737290A (en) * 1970-09-22 1973-06-05 Deutsche Edelstahlwerke Ag Sintered titanium alloy
DE19720706A1 (de) * 1996-05-17 1997-11-20 Ebara Corp Abriebfeste Titanlegierung
JP2000127047A (ja) * 1998-10-22 2000-05-09 Chukyo Kenma Kk 抗菌性金属ゾルの製造と加圧式加熱方法による金属被覆処理 砥石における抗菌転移性被覆処理方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 08 6 October 2000 (2000-10-06) *

Also Published As

Publication number Publication date
US20050025655A1 (en) 2005-02-03
KR100550235B1 (ko) 2006-02-08
CN1575891A (zh) 2005-02-09
KR20050013329A (ko) 2005-02-04
JP2005048276A (ja) 2005-02-24

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