JPH0319282B2 - - Google Patents
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- Publication number
- JPH0319282B2 JPH0319282B2 JP57127874A JP12787482A JPH0319282B2 JP H0319282 B2 JPH0319282 B2 JP H0319282B2 JP 57127874 A JP57127874 A JP 57127874A JP 12787482 A JP12787482 A JP 12787482A JP H0319282 B2 JPH0319282 B2 JP H0319282B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered
- powder
- iron
- sintered body
- nickel
- 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.)
- Expired - Lifetime
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- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はロータリコンプレツサ用ベーンなどに
用いられる耐摩耗性を有する焼結部品の製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a wear-resistant sintered part used for rotary compressor vanes and the like.
ロータリコンプレツサは、空調機やシヨーケー
スなどに用いられており、第１図で示す構成をな
している。第１図においては１はシリンダ、２は
シリンダ１内部で偏心回転するロータ、３はベー
ンである。このロータリコンプレツサにおいて、
ベーン３は回転するロータ２に対して常時押付け
て接触し、ロータ２の回転に応じて往復動しシリ
ンダ１内部を圧力的に仕切る役割を果している。
このため、ベーン３は気密性を有することは勿論
であるが、ロータ２と摺接する部分およびシリン
ダ１と接する部分の摩耗が著るしいために高い耐
摩耗性が要求される。
A rotary compressor is used in an air conditioner, a case, etc., and has the configuration shown in FIG. In FIG. 1, 1 is a cylinder, 2 is a rotor that rotates eccentrically inside the cylinder 1, and 3 is a vane. In this rotary compressor,
The vanes 3 are always pressed against and in contact with the rotating rotor 2, move reciprocatingly in response to the rotation of the rotor 2, and play the role of partitioning the inside of the cylinder 1 under pressure.
For this reason, although the vane 3 naturally has airtightness, it is required to have high wear resistance because the parts in sliding contact with the rotor 2 and the parts in contact with the cylinder 1 are subject to significant wear.
従来、このロータリコンプレツサのベーンは、
その多くが高速度鋼や共晶黒鉛鋳鉄のような耐摩
耗性を高めた溶解材を材料として製造されてい
る。また、最近では鉄系粉末からなる焼結体に水
蒸気処理を施して耐摩耗性と気密性を高めた焼結
体で製造するロータも開発されている。 Conventionally, the vanes of this rotary compressor were
Many of these are manufactured from melted materials with increased wear resistance, such as high-speed steel or eutectic graphite cast iron. Recently, rotors have also been developed that are manufactured from sintered bodies made of iron-based powder that have been subjected to steam treatment to improve wear resistance and airtightness.
しかして、近時空調機においては、例えば中近
東などの熱帯地方で使用する、あるいはインバー
タを設けるという苛酷な使用条件が要求されるも
のがあり、このような空調機において用いられる
ロータリコンプレツサでは従来以上に苛酷な運転
条件すなわち高速運転や変速運転が要求されてい
る。これに伴いロータリコンプレツサに設けられ
るベーンも、高速動作するために通常の場合に比
してより高い耐摩耗性を有することが必要とな
る。 However, some modern air conditioners are required to be used in tropical regions such as the Middle East, or are required to be used under harsh conditions such as being equipped with an inverter. More severe operating conditions than ever before, ie, high speed operation and variable speed operation, are required. Accordingly, the vanes provided in the rotary compressor must also have higher wear resistance than usual in order to operate at high speed.
しかしながら、従来の溶解材または焼結体によ
り製造されてきたベーンは、いずれも前記のよう
な苛酷な運転条件下での使用に耐え得る高い耐摩
耗性および耐久性を有しておらず使用することが
できなかつた。 However, conventional vanes manufactured using melted materials or sintered materials do not have high wear resistance and durability to withstand use under the harsh operating conditions mentioned above. I couldn't do it.
本発明は苛酷な使用条件に耐え得る高い耐摩耗
性を有する焼結部品、特にロータリコンプレツサ
用ベーンに好適な焼結部品を得る製造方法を提供
するものである。
The present invention provides a manufacturing method for obtaining a sintered part having high wear resistance that can withstand severe usage conditions, particularly a sintered part suitable for rotary compressor vanes.
本発明の耐摩耗性を有する焼結部品の製造方法
は、重量％でクロムを含む鉄合金粉末５〜60％、
カーボン粉末0.2〜２％を含有し、残部が鉄−ニ
ツケル−銅−モリブデン合金粉末からなる焼結体
を、窒化処理した後に水蒸気処理することによ
り、焼結部品を製造するものである。また、要す
れば焼結体の鉄−ニツケル−銅−モリブデン合金
粉末の一部をニツケル粉末に置換するものであ
る。
The method for producing a wear-resistant sintered part of the present invention includes iron alloy powder containing chromium in an amount of 5 to 60% by weight;
A sintered part is manufactured by nitriding a sintered body containing 0.2 to 2% of carbon powder and the remainder consisting of iron-nickel-copper-molybdenum alloy powder, followed by steam treatment. Further, if necessary, part of the iron-nickel-copper-molybdenum alloy powder in the sintered body is replaced with nickel powder.
すなわち、上記粉末成分からなる焼結体を成形
し、この焼結体に窒化処理を施すことにより焼結
体の組織中に金属窒化物を分散して生成して耐摩
耗性をもたせ、その後に焼結体に水蒸気処理を施
すことにより、焼結体の組織中に金属酸化物を分
散生成して気密性をもたせるとともに、窒素成分
による脆性を大幅に改善して耐摩耗性の効果を高
めるようにしたもので、その結果気密性に加えて
優れた耐摩耗性を有する焼結部品を製造できる。
また、焼結体に鉄−ニツケル−銅−モリブデン合
金粉末を用いることにより、基地組織に強さと靭
性を与えることができる。 That is, a sintered body made of the above powder components is formed, and the sintered body is subjected to a nitriding treatment to disperse and generate metal nitrides in the structure of the sintered body, thereby imparting wear resistance. By applying steam treatment to the sintered body, metal oxides are dispersed in the structure of the sintered body to create airtightness, and the brittleness caused by nitrogen components is greatly improved to improve wear resistance. As a result, it is possible to produce sintered parts that have excellent wear resistance in addition to airtightness.
Furthermore, by using iron-nickel-copper-molybdenum alloy powder in the sintered body, strength and toughness can be imparted to the matrix structure.
以下本発明による焼結部品の製造方法について
説明する。 The method for manufacturing sintered parts according to the present invention will be explained below.
まず、クロムを含む鉄合金粉末、カーボン粉末
を含有し、残部が鉄−ニツケル−銅−モリブデン
合金粉末からなり、さらに要すれば鉄−ニツケル
−銅−モリブデン合金粉末の一部をニツケル粉末
で置換してなる原料粉末を用意する。 First, it contains iron alloy powder containing chromium and carbon powder, and the remainder consists of iron-nickel-copper-molybdenum alloy powder, and if necessary, part of the iron-nickel-copper-molybdenum alloy powder is replaced with nickel powder. Prepare raw material powder.
ここで、クロムを含む鉄合金粉末のクロムは、
焼結工程において一部がカーボンと結合して炭化
物を分散生成し、他は基地に固溶して焼入性を高
め、焼結後の空冷で硬いマルテンサイトの生成を
可能にするとともに、水蒸気処理時のマルテンサ
イト基地の焼戻し軟化を遅帯させる効果を有す
る。また、クロムは窒化処理により窒素と結合し
て耐摩耗性を高める役割を有している。クロムを
含む鉄合金粉末の割合は、重量％で５％未満では
窒素と結合して基地の硬質層を形成する割合が少
ないので耐摩耗性を向上させる効果が小さく、60
％を越えると硬質相が多くなり粒子間の結合が脆
くなつて脆性が増大するので、５〜60％の範囲、
好ましくは10〜45％の範囲とする。なお、クロム
は10〜30％を含むことが望ましく、ステンレス鋼
粉末であれば良い。この場合、ニツケルを含むス
テンレス鋼粉末でも良い。 Here, the chromium in the iron alloy powder containing chromium is
During the sintering process, some parts combine with carbon to form dispersed carbides, while others solidly dissolve in the matrix to improve hardenability, and enable the formation of hard martensite by air cooling after sintering. It has the effect of delaying the tempering softening of the martensite base during processing. Further, chromium has the role of increasing wear resistance by combining with nitrogen through nitriding treatment. If the proportion of iron alloy powder containing chromium is less than 5% by weight, the effect of improving wear resistance will be small because the proportion of it combining with nitrogen to form a hard base layer will be small.
If it exceeds 5% to 60%, the hard phase increases and the bonds between particles become weaker, increasing brittleness.
Preferably it is in the range of 10 to 45%. Note that it is desirable that the content of chromium is 10 to 30%, and any stainless steel powder may be used. In this case, stainless steel powder containing nickel may be used.
カーボン粉末は、焼結工程においてその一部が
クロムと結合して炭化物を分散生成し、他の部分
は基地に固溶して焼結時の冷却過程でマルテンサ
イトを生成する。カーボン粉末は0.2％未満では
効果が得られず、２％を越えると脆化し成形性が
悪化するので、0.2〜２％の範囲、好ましくは0.6
〜1.5％の範囲とする。 A part of the carbon powder combines with chromium during the sintering process to disperse and generate carbide, and the other part is solidly dissolved in the matrix and generates martensite during the cooling process during sintering. If the carbon powder is less than 0.2%, no effect will be obtained, and if it exceeds 2%, it will become brittle and the moldability will deteriorate, so the carbon powder should be in the range of 0.2 to 2%, preferably 0.6%.
~1.5% range.
鉄−ニツケル−銅−モリブデン合金粉末の成分
はいずれも基地組織に強さと靭性を与えるもの
で、各成分の割合はニツケル0.7〜５％で好まし
くは１〜３％、銅0.7〜３％で好ましくは１〜２
％、モリブデン0.3〜１％で好ましくは0.4〜0.7％
とする。この粉末は基地組織に含有してその強さ
と靭性を与える役割をなしている。 All the components of the iron-nickel-copper-molybdenum alloy powder give strength and toughness to the base structure, and the proportion of each component is 0.7 to 5% for nickel, preferably 1 to 3%, and 0.7 to 3% for copper. is 1~2
%, molybdenum 0.3-1%, preferably 0.4-0.7%
shall be. This powder is included in the matrix structure and plays a role in giving it strength and toughness.
ニツケル粉末は、窒化処理時に窒化されないの
で、基地組織の粒子間の結合に利用する。ニツケ
ル粉末は１％未満では効果がなく、10％を越える
と軟質相が多くなり耐摩耗性が低下するので、そ
の割合を１〜10％、好ましくは３〜８％の範囲と
する。 Since nickel powder is not nitrided during nitriding treatment, it is used for bonding between particles of the base tissue. If the nickel powder is less than 1%, it will have no effect, and if it exceeds 10%, the soft phase will increase and the wear resistance will decrease, so the proportion should be in the range of 1 to 10%, preferably 3 to 8%.
しかして、このような原料粉末を圧力４〜６ト
ン／cm2程度で加圧して所定形状の粉末成形体を成
形し、得られた粉末成形体を還元雰囲気中、温度
1100〜1300℃で焼結して焼結体を成形する。この
焼結により鉄窒化物およびクロム窒化物が分散生
成され且つマルテンサイトを焼戻した状態の強靭
な基地組織を有する焼結体が得られる。 Then, such raw material powder is pressurized at a pressure of about 4 to 6 tons/cm 2 to form a powder compact of a predetermined shape, and the obtained powder compact is heated in a reducing atmosphere at temperature.
Sinter at 1100-1300℃ to form a sintered body. This sintering produces a sintered body in which iron nitrides and chromium nitrides are dispersed and has a strong matrix structure in which martensite is tempered.
そして、焼結体に窒化処理を施して、焼結体に
窒化層を形成する。この窒化処理は、アンモニア
30〜60％を含む雰囲気中、500〜700℃、15分〜２
時間の条件でなされる。この窒化処理により焼結
体の基地組織に鉄窒化物およびクロム窒化物が分
散生成され、焼結体に耐摩耗性が与えられる。 Then, the sintered body is subjected to nitriding treatment to form a nitrided layer on the sintered body. This nitriding process uses ammonia
In an atmosphere containing 30 to 60%, 500 to 700℃, 15 minutes to 2
done in terms of time. Through this nitriding treatment, iron nitrides and chromium nitrides are dispersed and produced in the matrix structure of the sintered body, thereby imparting wear resistance to the sintered body.
さらに、焼結体に水蒸気処理を施す。この水蒸
気処理は、550〜600℃、0.3〜１Kg／cm2の過熱水
蒸気中、２〜３時間の条件でなされる。この水蒸
気処理により焼結体の基地組織の空孔に鉄酸化物
が分散生成され、この鉄酸化物は焼結体の耐摩耗
性を向上させるとともに、焼結体の基地組織の空
孔を封じる役割を果して気密性を与える。鉄酸化
物はまた潤滑油の保油性に優れている。さらに、
水蒸気処理により焼結体の基地組織に存在してい
る窒素分が拡散して、基地組織の粒子中に固溶す
るために、窒素分の存在による焼結体の脆性を大
幅に改善できる。すなわち、窒化処理により焼結
体の基地組織の空孔に侵入した窒素（ガス）は、
組織の粒子に付着することで窒化物を形成する。
しかし、粒子に付着した窒素は粒子の硬度を高め
るが、逆に粒子間の結合を脆くするので、粒子同
志の脱落が生じて、これが焼結体の欠けを起して
脆性を与えることになる。そこで、水蒸気処理に
より基地組織の空孔に水蒸気が侵入し、粒子に付
着した窒素分を加熱して粒子に固溶させてしまう
ものである。また、窒素分を基地組織内に拡散す
ることにより、焼結体の窒化層の深さにかかわり
なく均一な硬さをもたせることができる。従つ
て、窒化処理による焼結体の脆性を抑制して耐摩
耗性のみを与えることができる。 Furthermore, the sintered body is subjected to steam treatment. This steam treatment is carried out in superheated steam at 550 to 600° C. and 0.3 to 1 kg/cm 2 for 2 to 3 hours. Through this steam treatment, iron oxide is dispersed and generated in the pores of the base structure of the sintered body, and this iron oxide improves the wear resistance of the sintered body and seals the pores of the base structure of the sintered body. It fulfills its role and provides airtightness. Iron oxides also have excellent lubricating oil retention properties. moreover,
The nitrogen present in the base structure of the sintered body is diffused by the water vapor treatment and becomes solid solution in the particles of the base structure, so that the brittleness of the sintered body due to the presence of nitrogen can be significantly improved. In other words, the nitrogen (gas) that has entered the pores of the matrix structure of the sintered body through the nitriding process,
Forms nitrides by adhering to tissue particles.
However, although nitrogen adhering to particles increases the hardness of the particles, it also weakens the bonds between particles, causing particles to fall off from each other, which causes chipping of the sintered body and makes it brittle. . Therefore, by steam treatment, steam enters the pores of the base tissue, heats the nitrogen attached to the particles, and dissolves them into solid solution in the particles. Furthermore, by diffusing nitrogen into the matrix structure, the sintered body can have uniform hardness regardless of the depth of the nitrided layer. Therefore, it is possible to suppress the brittleness of the sintered body due to the nitriding treatment and provide only wear resistance.
また、焼結体の粉末成分としてニツケルを添加
することにより、基地組織の粒子結合をより強固
にできる。 Furthermore, by adding nickel as a powder component of the sintered body, the particle bonding of the matrix structure can be made stronger.
このように製造された焼結部品は、強靭な基地
組織に加えて気密性を有し、さらに脆性を排して
苛酷な使用条件に耐え得る優れた耐摩耗性を有す
るものであり、ロータリコンプレツサのベーンや
ベーンポンプのベーンなどに有効に使用できる。 The sintered parts manufactured in this way have a strong base structure, airtightness, and excellent wear resistance that eliminates brittleness and can withstand harsh usage conditions, making them ideal for rotary compressors. It can be effectively used for wing vanes and vane pump vanes.
本発明の一実施例として次に述べる方法で焼結
部品を製造した。クロム13％、Mn，Si各々0.6
％、残部鉄及び不可避不純物からなる鉄合金粉末
40％、カーボン粉末1.5％、ニツケル粉末４％、
残部鉄96.25％−ニツケル1.75％−銅1.5％−モリ
ブデン0.5％粉末からなる原料粉末を成形圧６ト
ン／cm2で加圧して厚さ５cmの板状をなす粉末成形
体を成形し、この粉末成形体を露点−20℃の水素
雰囲気中、温度1200℃の条件で1.0時間焼結し、
空冷程度の速度で冷却した。次いで、得られた焼
結体に温度600℃の下でRXガス（CO−CO2ガス）
23％−アンモニアガス60％−窒素17％からなるガ
ス中で1.0時間の窒化処理を施した。さらに、焼
結体に温度600℃、0.5Kg／cm2の過熱水蒸気中で水
蒸気処理を3.0時間施して焼結部品を得た。また、
本発明の製造方法で得られた焼結部品と比較する
ために、本発明の場合と同じ成分の原料粉末と同
じ条件で焼結体を成形し、この焼結体に本発明の
場合と同じ条件で水蒸気処理のみを施して焼結部
品を製造した。
As an example of the present invention, a sintered part was manufactured by the method described below. Chromium 13%, Mn, Si each 0.6
%, balance iron and inevitable impurities iron alloy powder
40%, carbon powder 1.5%, nickel powder 4%,
Raw material powder consisting of balance iron 96.25% - nickel 1.75% - copper 1.5% - molybdenum 0.5% powder is pressed at a molding pressure of 6 tons/cm 2 to form a powder compact into a plate shape with a thickness of 5 cm. The molded body was sintered for 1.0 hours at a temperature of 1200°C in a hydrogen atmosphere with a dew point of -20°C.
It was cooled at a speed similar to that of air cooling. Then, the obtained sintered body was injected with RX gas (CO−CO 2 gas) at a temperature of 600℃.
Nitriding treatment was carried out for 1.0 hour in a gas consisting of 23%-ammonia gas 60%-nitrogen 17%. Further, the sintered body was subjected to steam treatment for 3.0 hours in superheated steam at a temperature of 600° C. and a concentration of 0.5 kg/cm 2 to obtain a sintered part. Also,
In order to compare with the sintered parts obtained by the manufacturing method of the present invention, a sintered body was molded under the same conditions as the raw material powder with the same components as in the case of the present invention, and this sintered body was A sintered part was manufactured by applying only steam treatment under the following conditions.
そして、本発明の焼結部品と比較例の焼結部品
の耐摩耗性を比較するために、第２図で示すよう
に両方の焼結部品を試験片４として用意し、且つ
共晶黒鉛鋳鉄からなる回転円板５を210RPMで回
転させながら25Kgの力を加えて試験片４に接触さ
せることにより、試験片４の摩耗量を調べた。な
お、試験片４と回転円板５との接触面には潤滑油
を滴下した。その結果、比較例の焼結部品の摩耗
量は100％とした時に、本発明の焼結部品の摩耗
量は60％であつた。従つて、本発明により得られ
た焼結部品は、従来の方法で得られた焼結部品に
比して摩耗量が大変少なく耐摩耗性が優れている
ことが判る。 In order to compare the wear resistance of the sintered parts of the present invention and the sintered parts of the comparative example, both sintered parts were prepared as test specimens 4 as shown in FIG. The amount of wear on the test piece 4 was examined by applying a force of 25 kg to contact the test piece 4 while rotating the rotating disk 5 at 210 RPM. Note that lubricating oil was dropped onto the contact surface between the test piece 4 and the rotating disk 5. As a result, when the wear amount of the sintered part of the comparative example was taken as 100%, the wear amount of the sintered part of the present invention was 60%. Therefore, it can be seen that the sintered parts obtained by the present invention have much less wear and are superior in wear resistance than the sintered parts obtained by the conventional method.
さらに、本発明の焼結部品を過酷な運転条件を
要求されるロータリコンプレツサにおけるベーン
として使用したが、このベーンは気密性にも優れ
摩耗も大変少なかつた。 Furthermore, the sintered part of the present invention was used as a vane in a rotary compressor that requires severe operating conditions, and the vane had excellent airtightness and very little wear.
また本発明の他の実施例としてニツケル粉末を
使用せずにクロム13％を含む鉄合金粉末40％、カ
ーボン粉末1.5％、残部鉄96.25％−ニツケル1.75
％−銅1.5％−モリブデン0.5％粉末を用いて前記
一実施例と同様に製造した焼結部品について、水
蒸気処理のみを施して製造した同組成の比較例と
前記耐摩耗性を比較したところ、比較例の摩耗量
100％に対して他の実施例の摩耗量は62％であつ
た。 As another example of the present invention, 40% iron alloy powder containing 13% chromium, 1.5% carbon powder, balance 96.25% iron - nickel 1.75 without using nickel powder.
% - 1.5% copper - 0.5% molybdenum powder The sintered parts were manufactured in the same manner as in the above example, and the wear resistance was compared with a comparative example of the same composition manufactured only by steam treatment. Wear amount of comparative example
The wear amount of other examples was 62% compared to 100%.
以上説明したように本発明の耐摩耗性を有する
焼結部品の製造方法によれば、強靭な基地組織を
有し、気密性に加えて苛酷な使用条件に耐え得る
優れた耐摩耗性を有する焼結部品を得ることがで
きる。
As explained above, according to the method of manufacturing a wear-resistant sintered part of the present invention, it has a strong matrix structure, and has excellent wear resistance that can withstand severe usage conditions in addition to airtightness. Sintered parts can be obtained.
第１図は本発明の製造方法により得られる焼結
部品の一例であるベーンを備えたロータリコンプ
レツサを示す概略的構成図、第２図は焼結部品の
耐摩耗試験を示す説明図である。
１……シリンダ、２……ロータ、３……ベー
ン。
Fig. 1 is a schematic configuration diagram showing a rotary compressor equipped with vanes, which is an example of a sintered part obtained by the manufacturing method of the present invention, and Fig. 2 is an explanatory diagram showing a wear resistance test of the sintered part. . 1...Cylinder, 2...Rotor, 3...Vane.
Claims (1)
カーボン粉末0.2〜２％を含有し、残部が鉄−ニ
ツケル−銅−モリブデン合金粉末からなる焼結体
を、窒化処理した後に水蒸気処理することを特徴
とする耐摩耗性を有する焼結部品の製造方法。 ２ 重量％でクロムを含む鉄合金粉末５〜60％、
カーボン粉末0.2〜２％、ニツケル粉末１〜10％
を含有し、残部が鉄−ニツケル−銅−モリブデン
合金粉末からなる焼結体を、窒化処理した後に水
蒸気処理することを特徴とする耐摩耗性を有する
焼結部品の製造方法。[Claims] 5 to 60% iron alloy powder containing 1% by weight of chromium;
Manufacture of a sintered part having wear resistance characterized by nitriding a sintered body containing 0.2 to 2% of carbon powder and the remainder consisting of iron-nickel-copper-molybdenum alloy powder and then steam-treating it. Method. 2 5-60% iron alloy powder containing chromium by weight;
Carbon powder 0.2-2%, Nickel powder 1-10%
1. A method for manufacturing a sintered part having wear resistance, which comprises nitriding a sintered body containing iron-nickel-copper-molybdenum alloy powder with the remainder being iron-nickel-copper-molybdenum alloy powder and then steam-treating it.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57127874A JPS5920446A (en) | 1982-07-22 | 1982-07-22 | Manufacture of wear resistant sintered parts |
| US06/513,797 US4501613A (en) | 1982-07-22 | 1983-07-14 | Wear resistant sintered body |
| DE3326548A DE3326548C2 (en) | 1982-07-22 | 1983-07-22 | Wear-resistant sintered steel body, method for its production and use of the sintered steel body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57127874A JPS5920446A (en) | 1982-07-22 | 1982-07-22 | Manufacture of wear resistant sintered parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5920446A JPS5920446A (en) | 1984-02-02 |
| JPH0319282B2 true JPH0319282B2 (en) | 1991-03-14 |
Family
ID=14970772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57127874A Granted JPS5920446A (en) | 1982-07-22 | 1982-07-22 | Manufacture of wear resistant sintered parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5920446A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6275083A (en) * | 1985-09-27 | 1987-04-06 | Hitachi Ltd | compressor |
| US5087181A (en) * | 1989-03-06 | 1992-02-11 | Hitachi, Ltd. | Sliding structure such as compressor or the like |
| US5403372A (en) * | 1991-06-28 | 1995-04-04 | Hitachi Metals, Ltd. | Vane material, vane, and method of producing vane |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5186006A (en) * | 1975-01-24 | 1976-07-28 | Ito Metal Abrasive | TOKUSHUSHOKETSUGOKINNOSEIZOHOHO |
| SE424165B (en) * | 1978-09-15 | 1982-07-05 | Sundpacma Ab | MACHINE DEVICE FOR PRESSURE AND CLOSING OF SLOT CORDS |
-
1982
- 1982-07-22 JP JP57127874A patent/JPS5920446A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5920446A (en) | 1984-02-02 |
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