JP2775810B2 - Cemented carbide having a composite area - Google Patents

Cemented carbide having a composite area

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Publication number
JP2775810B2
JP2775810B2 JP1032347A JP3234789A JP2775810B2 JP 2775810 B2 JP2775810 B2 JP 2775810B2 JP 1032347 A JP1032347 A JP 1032347A JP 3234789 A JP3234789 A JP 3234789A JP 2775810 B2 JP2775810 B2 JP 2775810B2
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cemented carbide
alloy
binder phase
wc
powder
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JPH02209448A (en
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稔 中野
俊雄 野村
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住友電気工業株式会社
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【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、優れた靭性と耐摩耗性とを兼ね備えた超硬合金に関する。 DETAILED DESCRIPTION OF THE INVENTION The present invention [relates] concerns cemented carbide having both excellent toughness and wear resistance.

〔従来の技術〕 [Prior art]

従来から、工具用合金として、WCやTiC等を含む硬質分散相と、Fe、Ni、Co等の鉄族金属の結合相とからなる超硬合金が用いられてきた。 Conventionally, as an alloy tool, a hard dispersed phase comprising WC and TiC, etc., Fe, Ni, cemented carbide comprising a binder phase of an iron group metal such as Co has been used. 特に、ポンチ、ヘツダー等の鍛造工具のように耐摩耗性及び耐衝撃性が要求されるものには、WC−Co系超硬合金が主に使用されている。 In particular, punch, the ones wear resistance and impact resistance is required as in the forging tool such Hetsuda, WC-Co-based cemented carbide is mainly used.

これら超硬合金では、工具としての性能を改善するため、Co量の調整やWCの微細化によつて耐摩耗性や靭性の向上が図られてきた。 In these cemented carbide, in order to improve the performance of the tool, improving by connexion wear resistance and toughness to the miniaturization of the Co content of adjustment and WC it has been achieved.

しかし、耐摩耗性と靭性とは相反する性質であるため、両方を同時に改善向上させることは困難であつた。 However, since the wear resistance and toughness are contradictory properties, it was filed difficult to both improve simultaneously improved.
例えば、WC−Co系超硬合金では、高靭性を付与するため For example, in the WC-Co-based cemented carbide, for imparting high toughness
Co量を増加させると必然的に耐摩耗性が低下し、逆にCo Inevitably wear resistance is lowered by increasing the amount of Co, Co conversely
量を減少させると耐摩耗性は向上するが靭性が低下する。 Decreasing the amount abrasion resistance is improved toughness is reduced.

このような事情から、超硬合金の耐摩耗・耐衝撃用工具としての用途は、ハイスに比較して制限されてきた。 Under these circumstances, use as abrasion and impact tool of cemented carbide, it has been limited compared to high speed steel.

〔発明が解決しようとする課題〕 本発明はかかる従来の事情に鑑み、耐摩耗・耐衝撃用工具としては好適な、優れた靭性と耐摩耗性とを兼ね具えた超硬合金を提供することを目的とする。 [Invention Problems to be Solved The present invention has been made in view of the conventional circumstances such, suitable as a wear and impact tools, providing equipped serves as a good toughness and wear resistance of cemented carbide With the goal.

〔課題を解決するための手段〕 [Means for Solving the Problems]

上記目的を達成するために、本発明ではWCを含む硬質分散相を鉄族金属の結合相とからなる超硬合金において、プレス成形の型に所定の結合相量の粉末を充填し、 In order to achieve the above object, the hard dispersed phase containing WC in the present invention in a cemented carbide comprising a binder phase of an iron group metal, filled with a powder of a given binder phase content to the type of press forming,
その表面となる部分に結合相量を減少させた粉末を充填し、これをプレス成形した後焼結することにより、合金表面に合金内部よりも結合相量の減少した領域を形成し、合金表面部に0.5〜33kg/mm 2の圧縮応力を生ぜしめたことを特徴とする。 Filled with powder having a reduced binding phase content in the portion serving as the surface, which by sintering after press forming, to form a reduced area of ​​the binder phase content than alloy inner surface of the alloy, the alloy surface characterized in that give rise to compressive stress of 0.5~33kg / mm 2 in section.

〔作用〕 [Action]

本発明の超硬合金では、合金表面にCo等の結合相量を減少した領域を有するので、合金表面での耐摩耗性が繊維又は改善される。 The cemented carbide of the present invention, because it has a region with reduced binding phase content of Co or the like on the alloy surface, the wear resistance of the alloy surface is fibrous or improved. これと同時に、耐摩耗性に寄与しない合金内部で相対的にCo等の結合相量を多く出来るので、全体として高い靭性を付与することが可能である。 At the same time, since it increase the binding phase of relatively Co such an alloy inside that do not contribute to the wear resistance, it is possible to impart a high toughness as a whole.

結合相量減少領域の厚さtdと、該領域以外の平均的結合相量領域の厚さtsとの比ts/tdは1.0〜100の範囲が好ましい。 The thickness td of the binder phase loss region, the ratio ts / td of the thickness ts of the average binder phase content region other than the region is preferably in the range of 1.0 to 100.

超硬合金の表面と内部に2つの組成の異なる領域が形成されるので、焼結後の冷却過程において合金表面部に引張力ないし圧縮力の残留応力が生じる。 Since different regions of the two compositions to the surface and the interior of the cemented carbide is formed, the tensile force or compressive residual stress forces on the alloy surface portion during cooling after sintering occurs. 即ち、合金表面部の残留応力σは、結合相量減少領域の厚さtd、熱膨張係数αd及びヤング率Edと、その他の平均結合相量領域の厚さts、熱膨張係数αs及びヤング率Esとにより、 That is, the residual stress σ of the alloy surface portion, the thickness td, the thermal expansion coefficient αd and Young's modulus Ed, thickness ts, the thermal expansion coefficient αs and Young's modulus of the other average binder phase content area of ​​the binder phase loss region by and Es,
次式で表わされる: σ=K(αs−αd)Ed・△T (Kはts/td及びEs/Edで定められる値であり、△Tは焼結温度と室温の温度差を表わす。) 従つて、結合相量減少領域と平均的結合量領域の組成や厚さ等を選択することによつて、合金表面部に圧縮応力を生ぜしめることが可能である。 Is expressed by the following equation: σ = K (αs-αd) Ed · △ T (K is a value determined by ts / td and Es / Ed, △ T represents the temperature difference between the sintering temperature and room temperature.) accordance connexion, Yotsute to selecting binder phase loss region to the average binding amount composition and thickness of the region or the like, it is possible to give rise to compressive stress in the alloy surface portion. 例えば、WC−Co系超硬合金では上記の比ts/tdがほぼ1.0〜100の範囲において、残留応力σが圧縮応力となる。 For example, in the above range of the ratio ts / td approximately 1.0 to 100 in the WC-Co cemented carbide, the residual stress σ is compressive stress. 具体的に、合金表面をWC−10wt%Co及び合金内部をWC−15wt%Coで構成した本発明の超硬合金について、合金表面部の残留応力σと両領域の厚さの比ts/tdの関係を図面に示す。 Specifically, the cemented carbide of the present invention constructed of the alloy surface inside WC-10 wt% Co and alloy WC-15 wt% Co, the ratio ts / td of the thickness of the residual stress σ and both regions of the alloy surface portion It shows the relationship to the accompanying drawings. このように、合金表面部に圧縮応力を与えることにより、圧縮応力のない同一組成の合金表面部よりも引張強度や破壊靭性値を一層向上させることが出来る。 Thus, by providing a compressive stress on the alloy surface portion, the tensile strength and fracture toughness than alloy surface part of the same composition without the compressive stress can be further improved.

〔実施例〕 〔Example〕

実施例1 型を用いて外径20mm及び内径10mmの円筒状にプレス成形したWC−15wt%Coの粉末の外周に、更にWC−7wt%Co The outer periphery of the powder WC-15 wt% Co was pressed into a cylindrical outer diameter 20mm and the inner diameter 10mm with Example Type 1, further WC-7 wt% Co
粉末を厚さ0.1mm、0.5mm、1mmとなるようにプレス成形して複層構造とし、1400℃で焼結した。 The powder thickness 0.1 mm, 0.5 mm, by press-forming so as to 1mm and multilayer structure was sintered at 1400 ° C.. 得られた合金の合金表面(外周)の結合相量減少領域の厚さtdと、該領域以外の平均的結合相量領域の厚さtsとの比ts/tdは、 The thickness td of the binder phase loss region of the alloy surface of the obtained alloy (outer periphery), the ratio ts / td of the thickness ts of the average binder phase content region other than said region,
試料A、B及びCが夫々50、10及び1であつた。 Samples A, B and C Atsuta at respectively 50, 10 and 1. 又、合金表面部の残留応力をX線解析で測定したところ、試料A、B及びCが夫々−10kg/mm 2 、−24kg/mm 2及び−0.5k Further, the measured residual stress of the alloy surface portion by X-ray analysis, samples A, B and C respectively -10kg / mm 2, -24kg / mm 2 and -0.5k
g/mm 2であつた。 Atsuta in g / mm 2.

各合金試料を前方押出用ポンチとして用い、SCR21を断面減少率58%及び押出長10mmで寿命テストを行なつた。 Using each alloy sample as punch for forward extrusion line a lifetime test at a cross-section reduction rate of 58% and an extrusion length 10mm and SCR21 Natsuta. 比較のために、通常のWC−7Swt%Coの合金(試料D)とWC−15wt%Co合金(試料E)からなるポンチについても同様にテストした。 For comparison, it was tested similarly for punch comprising a conventional WC-7Swt% Co alloy (Sample D) and WC-15 wt% Co alloy (Sample E). その結果、本発明の合金である試料A、B及びCでは夫々12万個、30万個及び8万個のシヨツトが可能であつた。 As a result, alloy samples A, respectively 120,000 B, and C is the present invention, been made possible 300,000 and 80,000 Shiyotsuto. しかし、試料Dは6万個で亀裂が発生して寿命に至り、試料Eは4万個で摩耗が大きく使用不能となつた。 However, Sample D leads to life cracks occurred in 60,000, Sample E wear has come largely unusable 40,000.

実施例2 実施例1と同じ試料A、B及びCを用いて、初期形状が直径32mm及び長さ/径1.5のS15Cを鍛造(前方押出) Same sample A as in Example 1, using the B and C, the initial shape forging S15C diameter 32mm and length / diameter 1.5 (forward extrusion)
してキヤブランクを加工した。 Were processed Kiyaburanku to. この時のポンチの寿命は試料A、B乃びCが夫々8万個、30万個及び6万個であつた。 Life Sample A punch at this time, B 乃 beauty C is respectively 80,000, Atsuta at 300,000 and 60,000.

しかし、比較のために行なつた通常のWC−7wt%Co合金(試料D)とWC−15wt%Co合金(試料E)での同様のテストでは、試料Dは2万個で亀裂が発生して寿命に至り、試料Eは3000個で摩耗が大きく使用不能となつた。 However, in a similar test in line for comparison Natsuta normal WC-7 wt% Co alloy (Sample D) and WC-15 wt% Co alloy (Sample E), Sample D crack occurs in 20,000 It reaches the lifetime Te, sample E has fallen and unusable large wear 3000.

〔発明の効果〕 〔Effect of the invention〕

本発明によれば、合金表面と内部とで結合相量を変えた領域を形成することによつて、優れた靭性と耐摩耗性とを兼ね具えた超硬合金を提供することが出来る。 According to the present invention, it is possible to provide Yotsute to form a region of varying binder phase content in the inner and the alloy surface, excellent toughness and wear resistance and the doubles comprises hard metal.

従って、この超硬合金は、鍛造等に用いる耐摩耗・耐衝撃用工具として好適である。 Accordingly, the cemented carbide is suitable as a wear and impact tool used for forging.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

図面は本発明の超硬合金の一具体例において、合金表面部の残留応力σと、合金表面の結合相量減少領域の厚さ In one embodiment of the cemented carbide of the drawings the present invention, the residual stress of the alloy surface portion sigma, the thickness of the binder phase loss region of the alloy surface
tdと該領域以外の平均的結合相量領域の厚さtsとの比ts The ratio ts and the thickness ts of the average binder phase content regions other than td and region
/tdとの関係を示すグラフである。 Is a graph showing the relationship between / td.

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】WCを含む硬質分散相と鉄族金属の結合相とからなる超硬合金において、プレス成形の型に所定の結合相量の粉末を充填し、その表面となる部分に結合相量を減少させた粉末を充填し、これをプレス成形した後焼結することにより、合金表面に合金内部よりも結合相量の減少した領域を形成し、合金表面部に0.5〜33kg/mm 2 1. A cemented carbide comprising a hard dispersed phase and the iron group metal binder phase comprising WC, filled with powder of a predetermined binder phase content to the type of press forming, binder phase in the portion which becomes the surface filling the powder with a reduced amount, by sintering after this has been press-formed, than alloy inner surface of the alloy to form a reduced area of the binder phase content, 0.5~33kg / mm 2 on the alloy surface portion
    の圧縮応力を生ぜしめたことを特徴とする超硬合金。 Cemented carbide, characterized in that it caused a compression stress.
JP1032347A 1989-02-10 1989-02-10 Cemented carbide having a composite area Expired - Fee Related JP2775810B2 (en)

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JP1032347A JP2775810B2 (en) 1989-02-10 1989-02-10 Cemented carbide having a composite area

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Application Number Priority Date Filing Date Title
JP1032347A JP2775810B2 (en) 1989-02-10 1989-02-10 Cemented carbide having a composite area

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JPH02209448A JPH02209448A (en) 1990-08-20
JP2775810B2 true JP2775810B2 (en) 1998-07-16

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556788B1 (en) * 1992-02-20 1997-05-14 Mitsubishi Materials Corporation Hard alloy
JP2004292905A (en) 2003-03-27 2004-10-21 Tungaloy Corp Compositionally graded sintered alloy and method of producing the same
GB0816836D0 (en) 2008-09-15 2008-10-22 Element Six Holding Gmbh Steel wear part with hard facing
US20120177453A1 (en) 2009-02-27 2012-07-12 Igor Yuri Konyashin Hard-metal body

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0182759B2 (en) * 1984-11-13 1993-12-15 Santrade Ltd. Cemented carbide body used preferably for rock drilling and mineral cutting

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