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JP2008180211A - Manufacturing method for combustion engine or turbine parts - Google Patents

Manufacturing method for combustion engine or turbine parts Download PDF

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Publication number
JP2008180211A
JP2008180211A JP2007272213A JP2007272213A JP2008180211A JP 2008180211 A JP2008180211 A JP 2008180211A JP 2007272213 A JP2007272213 A JP 2007272213A JP 2007272213 A JP2007272213 A JP 2007272213A JP 2008180211 A JP2008180211 A JP 2008180211A
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manufacturing
temperature
metal
hollow valve
titanium
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Inventor
Eckard Aust
アウスト エッカルド
Wolfgang Limberg
リンベルク ウオルフガング
Ralf Pieplow
ピープロウ ラルフ
Nils Mildner
ミルトナー ニルス
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GKSS Forshungszentrum Geesthacht GmbH
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GKSS Forshungszentrum Geesthacht GmbH
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    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • 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
    • B22F5/008—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of engine cylinder parts or of piston parts other than piston rings
    • 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
    • B22F5/009—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine components other than turbine blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

【課題】本発明は、燃焼エンジン用またはタービン用部品の製造方法、特に、中空弁部品の製造方法に関する。この製造方法によりはじめて、従来の材料に加え粉末状チタン系合金がこれらの部品に加工できる。
【解決手段】この製造方法において、金属粉末および／または金属合金粉末が配合機中で結合剤および必要であれば融剤と混合され、混合物は射出成形により付形され、付形された配合物は化学的に分離され、化学的に分離された配合物は４５０℃未満の温度で熱的に分離され、化学的、熱的に分離された配合物は上記金属および／または金属合金の溶融温度未満の温度で焼結されて、上記部品が製造される。これらの部品は、従来のように型締付けおよび加力締付け法、さらに溶融結合法により互いに組み合わせることができる。
【選択図】なしThe present invention relates to a method for manufacturing a combustion engine or turbine component, and more particularly to a method for manufacturing a hollow valve component. Only by this manufacturing method, in addition to conventional materials, powdered titanium-based alloys can be processed into these parts.
In this manufacturing method, metal powder and / or metal alloy powder is mixed with a binder and, if necessary, a fluxing agent in a compounding machine, and the mixture is shaped by injection molding, and the shaped compound is shaped. Is chemically separated, the chemically separated formulation is thermally separated at a temperature below 450 ° C., and the chemically and thermally separated formulation is the melting temperature of the metal and / or metal alloy. The part is manufactured by sintering at a temperature below. These parts can be combined with each other by conventional mold clamping and force clamping, and further by melt bonding.
[Selection figure] None

Description

本発明は、燃焼エンジン用またはタービン用部品の製造方法、特に、中空弁部品の製造方法に関する。   The present invention relates to a method for manufacturing a combustion engine component or a turbine component, and more particularly to a method for manufacturing a hollow valve component.

今日、燃焼エンジンは、高い性能と低い燃料消費量を兼備することが期待されている。
燃焼エンジンに用いられるようなガス交換弁は、非常に高い操作温度と機械的応力に耐えることができなければならない。各吸気工程で、入口弁周囲を流れる補給冷ガスで冷却される入口弁は、５００℃以上の弁体温度に達する。出口弁は８００℃以上の温度に達する。 Today, combustion engines are expected to combine high performance with low fuel consumption.
Gas exchange valves, such as those used in combustion engines, must be able to withstand very high operating temperatures and mechanical stresses. In each intake step, the inlet valve cooled by the supplemental cold gas flowing around the inlet valve reaches a valve body temperature of 500 ° C. or higher. The outlet valve reaches a temperature above 800 ° C.

弁は可動部品なので、適用される駆動力は揺動質量、すなわち、弁、の重量とともに指数関数的に増大する。したがって、機械的強度と熱的強度を喪失せずに重量に関して弁をさらに最適化する必要がある。   Since the valve is a moving part, the applied driving force increases exponentially with the weight of the oscillating mass, ie the valve. Therefore, there is a need to further optimize the valve with respect to weight without losing mechanical and thermal strength.

独国特許出願公開１９８０４０５３（ＤＥ，Ａ１）German Patent Application Publication 19804053 (DE, A1)

心棒、弁コーンおよび弁体を持ち、弁コーンと弁体とがキャビティを形成する中空弁は、例えば特許文献１から知られている。そのような中空弁または中空弁部品は現在、熱押出または据込みおよび鍛造により成形されている。材料Ｎｏ．１．４８８２（X 50 CrMnNiNbN 21 9）、１．４８７１（X 53 CrMnNiN 21 9）または２．４９５５（NiFe 25 Cr 20 NbTi）のような耐熱鋼が、主として弁コーンおよび弁体に用いられている。他の材料、特に粉末形チタン系軽量材料は、酸素、窒素および炭素に比べチタンの反応性が高く、材料の脆化を伴うので、上記の方法を用いては中空弁部品に加工できないか、または有利には加工できない。   A hollow valve having a mandrel, a valve cone and a valve body, in which the valve cone and the valve body form a cavity, is known from Patent Document 1, for example. Such hollow valves or hollow valve parts are currently formed by hot extrusion or upsetting and forging. Material No. Heat resistant steels such as 1.4882 (X 50 CrMnNiNbN 21 9), 1.4871 (X 53 CrMnNiN 21 9) or 2.4955 (NiFe 25 Cr 20 NbTi) are mainly used for valve cones and valve bodies. . Other materials, especially powder-type titanium-based lightweight materials, have higher titanium reactivity than oxygen, nitrogen and carbon, and are accompanied by material embrittlement. Or it cannot be processed advantageously.

したがって、本発明の目的は、燃焼エンジン用またはタービン用部品の製造方法、特に、他の材料も有利に加工できる、弁コーンまたは弁体のような中空弁部品の製造方法、を提供することである。   Accordingly, it is an object of the present invention to provide a method for manufacturing a combustion engine or turbine component, particularly a method for manufacturing a hollow valve component such as a valve cone or valve body that can advantageously process other materials. is there.

上記の目的は、燃焼エンジン用またはタービン用部品の製造方法であって、
（ａ） 金属粉末および／または金属合金粉末が配合機中で結合剤および必要であれば凝集材料と混合され、
（ｂ） 上記混合物が射出成形により付形され、
（ｃ） 付形された配合物が化学的に分離され、
（ｄ） 化学的に分離された配合物が４５０℃未満の温度で熱的に分離され、
（ｅ） 化学的、熱的に分離された配合物が上記金属および／または金属合金の溶融温度未満の温度で焼結されて、上記部品が製造される、
製造方法により達成される。 The above object is a method for manufacturing a combustion engine or turbine component,
(A) the metal powder and / or metal alloy powder is mixed in a compounding machine with a binder and, if necessary, an agglomerated material;
(B) the mixture is shaped by injection molding;
(C) the shaped formulation is chemically separated;
(D) the chemically separated formulation is thermally separated at a temperature below 450 ° C .;
(E) the chemically and thermally separated blend is sintered at a temperature below the melting temperature of the metal and / or metal alloy to produce the part;
This is achieved by the manufacturing method.

本発明に係る方法では、マルテンサイト系−フェライト系およびオーステナイト系鋼またはニッケル系合金に加え、特にチタン系材料も中空弁部品に有利に加工できるので、既知の中空弁に比べいっそうの重量節減が達成できる。アルミニウムおよび／またはバナジウムを追加成分として含有するチタン合金を用いるのが好ましい。これらの付加的合金成分は各々、合金の全重量に対し２〜１０重量％の量で含有されているのが好ましい。   In the method according to the present invention, in addition to martensite-ferrite and austenitic steels or nickel alloys, particularly titanium-based materials can be advantageously processed into hollow valve parts, further weight savings can be achieved compared to known hollow valves. Can be achieved. It is preferable to use a titanium alloy containing aluminum and / or vanadium as an additional component. Each of these additional alloy components is preferably contained in an amount of 2 to 10% by weight relative to the total weight of the alloy.

結合剤は、以下からなる群から選ばれるのが好ましい： ポリアミド類、ポリオキシメチレン、ポリカーボネート、スチレン−アクリロニトリル−共重合体、ポリイミド、天然ワックス類および天然油類、熱硬化性プラスチック類、シアン酸塩類、ポリプロピレン、ポリアセテート、ポリエチレン、エチレン酢酸ビニル、ポリビニルアルコール、ポリ塩化ビニル、ポリスチレン、ポリメチルメタクリレート、アニリン類、鉱油類、水、寒天、グリセロール、ポリビニルブチリル、ポリブチルメタクリレート、セルロース、オレイン酸、フタレート類、パラフィンワックス類、カルナバ蝋、ポリアクリル酸アンモニウム、ステアリン酸ジグリセリドおよびオレイン酸ジグリセリド、グリセリルモノステアレート、イソプロピルチタネート、ステアリン酸リチウム、モノグリセリド類、ホルムアルデヒド、オクタン酸ホスフェート、スルホン酸オレフィン、リン酸エステル類、ステアリン酸、およびこれらの混合物。結合剤の容積割合は、好ましくは６０％未満、より好ましくは２０〜５０％である。   The binder is preferably selected from the group consisting of: polyamides, polyoxymethylene, polycarbonate, styrene-acrylonitrile-copolymer, polyimide, natural waxes and natural oils, thermosetting plastics, cyanic acid Salts, polypropylene, polyacetate, polyethylene, ethylene vinyl acetate, polyvinyl alcohol, polyvinyl chloride, polystyrene, polymethyl methacrylate, anilines, mineral oils, water, agar, glycerol, polyvinyl butyryl, polybutyl methacrylate, cellulose, oleic acid Phthalates, paraffin waxes, carnauba wax, ammonium polyacrylate, stearic acid diglyceride and oleic acid diglyceride, glyceryl monostearate, isopropyl titanate, Lithium phosphate, monoglycerides, formaldehyde, octanoic acid phosphate, sulfonic acid olefins, phosphoric acid esters, stearic acid, and mixtures thereof. The volume ratio of the binder is preferably less than 60%, more preferably 20 to 50%.

配合機における混合は、好ましくは５０〜２５０℃、最も好ましくは９０〜１５０℃の温度で実施する。   The mixing in the blender is preferably carried out at a temperature of 50 to 250 ° C, most preferably 90 to 150 ° C.

射出成形も好ましくは混合物の温度９０〜１５０℃で、好ましくは４００〜８００バールの圧力で行なう。   Injection molding is also preferably carried out at a mixture temperature of 90 to 150 ° C., preferably at a pressure of 400 to 800 bar.

化学的分離はパラフィン浴中、好ましくはヘキサン浴中で実施するのが好ましい。化学的分離は、好ましくは１０〜６５℃、より好ましくは３０〜５０℃の温度で実施する。   The chemical separation is preferably carried out in a paraffin bath, preferably in a hexane bath. The chemical separation is preferably carried out at a temperature of 10 to 65 ° C, more preferably 30 to 50 ° C.

熱的分離は、４５０℃未満、好ましくは２００〜３５０℃の温度で、好ましくは真空下に、好ましくは２〜２０ミリバールの圧力で実施する。   The thermal separation is carried out at a temperature below 450 ° C., preferably 200-350 ° C., preferably under vacuum, preferably at a pressure of 2-20 mbar.

焼結は、好ましくは金属または金属合金の溶融温度の８０〜９０％で、より好ましくは不活性ガス雰囲気下で実施する。不活性ガスはアルゴンであるのが好ましい。または、焼結は真空下でも実施できる。この場合には、圧力は好ましくは１０-3〜１０-5ミリバールである。 Sintering is preferably performed at 80 to 90% of the melting temperature of the metal or metal alloy, more preferably in an inert gas atmosphere. The inert gas is preferably argon. Alternatively, sintering can be performed under vacuum. In this case, the pressure is preferably 10 −3 to 10 −5 mbar.

このようにして製造される中空弁部品は、従来のように型締付けおよび加力締付け法、さらに溶融結合法により互いに組み合わせることができる。例えば、弁体と弁コーンとは焼きばめにより組み合わせることができる。弁コーンと弁心棒とは溶融結合法で組み合わせることができる。   The hollow valve parts manufactured in this way can be combined with each other by a conventional mold clamping and force clamping method and further by a melt bonding method. For example, the valve body and the valve cone can be combined by shrink fitting. The valve cone and the valve stem can be combined by melt bonding.

好ましい実施形態：
上述の方法を用いて、６重量％のアルミニウムと４重量％のバナジウムを含有するチタン合金を弁体と弁コーンに加工した。弁コーンと弁体は焼きばめにより組み合わせた。 Preferred embodiments:
Using the method described above, a titanium alloy containing 6 wt% aluminum and 4 wt% vanadium was processed into a valve body and a valve cone. The valve cone and disc were combined by shrink fitting.

組み合わされた弁体と弁コーンの平面図と線Ａ−Ａについての断面図である。It is a sectional view about line AA and a top view of a combined valve element and valve cone. 好ましい実施形態にしたがい製造した中空弁部品であり、全体の部品の状態（右）と分割した状態（左）を示す。It is a hollow valve part manufactured according to a preferred embodiment, showing the state of the entire part (right) and the state of being divided (left).

Claims (23)

燃焼エンジン用またはタービン用部品の製造方法であって、
（ａ） 金属粉末および／または金属合金粉末が配合機中で結合剤および必要であれば凝集材料と混合され、
（ｂ） 上記混合物が射出成形により付形され、
（ｃ） 付形された配合物が化学的に分離され、
（ｄ） 化学的に分離された配合物が４５０℃未満の温度で熱的に分離され、
（ｅ） 化学的、熱的に分離された配合物が上記金属および／または金属合金の溶融温度未満の温度で焼結されて、上記部品が製造される、
製造方法。 A method for producing a combustion engine or turbine component, comprising:
(A) the metal powder and / or metal alloy powder is mixed in a compounding machine with a binder and, if necessary, an agglomerated material;
(B) the mixture is shaped by injection molding;
(C) the shaped formulation is chemically separated;
(D) the chemically separated formulation is thermally separated at a temperature below 450 ° C .;
(E) the chemically and thermally separated blend is sintered at a temperature below the melting temperature of the metal and / or metal alloy to produce the part;
Production method. 上記部品が中空弁部品であることを特徴とする、請求項１記載の製造方法。   The manufacturing method according to claim 1, wherein the component is a hollow valve component. 上記中空弁部品が弁コーンである、請求項２記載の製造方法。   The manufacturing method according to claim 2, wherein the hollow valve component is a valve cone. 上記中空弁部品が弁体である、請求項２記載の製造方法。   The manufacturing method according to claim 2, wherein the hollow valve component is a valve body. チタン合金が金属合金粉末として用いられることを特徴とする、請求項１乃至４のいずれか記載の製造方法。   The manufacturing method according to any one of claims 1 to 4, wherein a titanium alloy is used as a metal alloy powder. 上記チタン合金はアルミニウムおよび／またはバナジウムを追加成分として含有していることを特徴とする、請求項５記載の製造方法。   6. The method according to claim 5, wherein the titanium alloy contains aluminum and / or vanadium as an additional component. 上記チタン合金は上記合金の全重量に対し２〜１０重量％のアルミニウムおよび／または２〜１０重量％のバナジウムを含有していることを特徴とする、請求項６記載の製造方法。   7. The method according to claim 6, wherein the titanium alloy contains 2 to 10% by weight of aluminum and / or 2 to 10% by weight of vanadium with respect to the total weight of the alloy. 上記結合剤は以下からなる群から選ばれることを特徴とする、前述の請求項のいずれか記載の製造方法： ポリアミド類、ポリオキシメチレン、ポリカーボネート、スチレン−アクリロニトリル−共重合体、ポリイミド、天然ワックス類および天然油類、熱硬化性プラスチック類、シアン酸塩類、ポリプロピレン、ポリアセテート、ポリエチレン、エチレン酢酸ビニル、ポリビニルアルコール、ポリ塩化ビニル、ポリスチレン、ポリメチルメタクリレート、アニリン類、鉱油類、水、寒天、グリセロール、ポリビニルブチリル、ポリブチルメタクリレート、セルロース、オレイン酸、フタレート類、パラフィンワックス類、カルナバ蝋、ポリアクリル酸アンモニウム、ステアリン酸ジグリセリドおよびオレイン酸ジグリセリド、グリセリルモノステアレート、イソプロピルチタネート、ステアリン酸リチウム、モノグリセリド類、ホルムアルデヒド、オクタン酸ホスフェート、スルホン酸オレフィン類、リン酸エステル類、ステアリン酸、およびこれらの混合物。   The method according to any one of the preceding claims, wherein the binder is selected from the group consisting of: polyamides, polyoxymethylene, polycarbonate, styrene-acrylonitrile-copolymer, polyimide, natural wax And natural oils, thermosetting plastics, cyanates, polypropylene, polyacetate, polyethylene, ethylene vinyl acetate, polyvinyl alcohol, polyvinyl chloride, polystyrene, polymethyl methacrylate, anilines, mineral oils, water, agar, Glycerol, polyvinyl butyryl, polybutyl methacrylate, cellulose, oleic acid, phthalates, paraffin waxes, carnauba wax, ammonium polyacrylate, stearic acid diglyceride and oleic acid diglyceride, glyceryl rubber Stearate, isopropyl titanate, lithium stearate, monoglycerides, formaldehyde, octanoic acid phosphate, sulfonic acid olefins, phosphoric acid esters, stearic acid, and mixtures thereof. 上記混合物中の上記結合剤の容積割合は６０％未満であることを特徴とする、前述の請求項のいずれか記載の製造方法。   The method according to any one of the preceding claims, characterized in that the volume fraction of the binder in the mixture is less than 60%. 上記混合物中の上記結合剤の容積割合は２０〜５０％であることを特徴とする、請求項９記載の製造方法。   The method according to claim 9, wherein the volume ratio of the binder in the mixture is 20 to 50%. 上記配合機における上記混合は５０〜２５０℃の範囲内の温度で実施することを特徴とする、前述の請求項のいずれか記載の製造方法。   The said mixing in the said compounding machine is implemented at the temperature within the range of 50-250 degreeC, The manufacturing method in any one of the said Claim characterized by the above-mentioned. 上記射出成形は上記混合物の温度９０〜１５０℃で行なうことを特徴とする、前述の請求項のいずれか記載の製造方法。   The method according to any one of the preceding claims, wherein the injection molding is performed at a temperature of 90 to 150 ° C of the mixture. 上記射出成形は４００〜８００バールの温度で行なうことを特徴とする、前述の請求項のいずれか記載の製造方法。   The method according to any one of the preceding claims, wherein the injection molding is performed at a temperature of 400 to 800 bar. 上記化学的分離はヘキサン浴中で実施することを特徴とする、前述の請求項のいずれか記載の製造方法。   The method according to claim 1, wherein the chemical separation is performed in a hexane bath. 上記化学的分離は１０〜６５℃の温度で実施することを特徴とする、前述の請求項のいずれか記載の製造方法。   The manufacturing method according to claim 1, wherein the chemical separation is performed at a temperature of 10 to 65 ° C. 上記化学的分離は３０〜５０℃の温度で実施することを特徴とする、請求項１５記載の製造方法。   The method according to claim 15, wherein the chemical separation is performed at a temperature of 30 to 50 ° C. 上記熱的分離は２〜２０ミリバールの圧力で実施することを特徴とする、前述の請求項のいずれか記載の製造方法。   The method according to claim 1, wherein the thermal separation is performed at a pressure of 2 to 20 mbar. 上記焼結は上記金属または金属合金の溶融温度の８０〜９０％で実施することを特徴とする、前述の請求項のいずれか記載の製造方法。   The method according to any one of the preceding claims, wherein the sintering is performed at 80 to 90% of the melting temperature of the metal or metal alloy. 上記焼結は不活性ガス雰囲気下で実施することを特徴とする、前述の請求項のいずれか記載の製造方法。   The manufacturing method according to claim 1, wherein the sintering is performed in an inert gas atmosphere. 上記不活性ガスはアルゴンであることを特徴とする、請求項１９記載の製造方法。   The manufacturing method according to claim 19, wherein the inert gas is argon. 上記焼結は真空下で実施することを特徴とする、請求項１乃至１８のいずれか記載の製造方法。   The manufacturing method according to claim 1, wherein the sintering is performed under vacuum. チタン系合金から構成されていることを特徴とする、請求項１乃至２１のいずれか記載の製造方法により製造される中空弁部品。   The hollow valve component manufactured by the manufacturing method according to any one of claims 1 to 21, wherein the hollow valve component is made of a titanium-based alloy. 上記チタン系合金はチタンに加え２〜１０重量％のアルミニウムおよび／または２〜１０重量％のバナジウムを含有していることを特徴とする、請求項２２記載の中空弁部品。   The hollow valve component according to claim 22, wherein the titanium-based alloy contains 2 to 10 wt% aluminum and / or 2 to 10 wt% vanadium in addition to titanium.
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