JP2840304B2 - Forging method - Google Patents
Forging methodInfo
- Publication number
- JP2840304B2 JP2840304B2 JP1194739A JP19473989A JP2840304B2 JP 2840304 B2 JP2840304 B2 JP 2840304B2 JP 1194739 A JP1194739 A JP 1194739A JP 19473989 A JP19473989 A JP 19473989A JP 2840304 B2 JP2840304 B2 JP 2840304B2
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- JP
- Japan
- Prior art keywords
- forging
- graphite
- heating furnace
- sintered body
- forged
- 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.)
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- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、焼結体を鍛造する鍛造方法に関するもので
ある。Description: TECHNICAL FIELD The present invention relates to a forging method for forging a sintered body.
（従来の技術） 金属部品の成形には、要求される形状、コストおよび
材料特性の面から、種々の加工成形技術が従来から選択
されてきているが、近年、複合材料が得られる、省資源
である等の特徴を有していることから、粉末治金技術が
注目されるようになってきている。(Prior Art) For forming metal parts, various processing and forming techniques have been conventionally selected in view of required shape, cost and material properties. Therefore, powder metallurgy technology has been attracting attention.
上記粉末治金技術としては、例えば、金属粉末等を焼
結する焼結法が良く知られている。該焼結法としては、
金属粉末等をプレス成形法、泥しょう鋳込法、押出法、
射出成形法等の方法により所定形状に成形し、しかる後
に焼結し、必要な場合には後加工を施して製品とする方
法が採らてている。As the powder metallurgy technique, for example, a sintering method of sintering a metal powder or the like is well known. As the sintering method,
Press molding method, slurry casting method, extrusion method,
A method of molding into a predetermined shape by a method such as an injection molding method, followed by sintering and, if necessary, post-processing to obtain a product is adopted.
ところで、上記の如くして得られる焼結体は、一般に
多孔質であるため、強度が低いという欠点があるが、該
欠点を改良する方法の一つとして焼結鍛造法が最近注目
されるようになってきている。この詠焼結鍛造法とは、
焼結体を所定温度に加熱した後、所定形状に鍛造するも
のであるが、焼結体を加熱炉から取り出して鍛造するま
での間に、焼結体が空気中の酸素との反応により酸化す
るという問題がある。特に、焼結体の場合、本来多孔質
であって内部に多数の空隙を有していることから、酸化
が焼結体の内部にまで及ぶ可能性がある。このような焼
結体の酸化は、強度（特に、疲労強度）の低下につなが
るとともに、酸化物が一般に硬いものであることから、
鍛造型の寿命を低下させる場合がある。By the way, the sintered body obtained as described above generally has a drawback of low strength because it is porous, and the sintering forging method has recently attracted attention as one method of improving the drawback. It is becoming. What is this sintering forging method?
After the sintered body is heated to a predetermined temperature and then forged into a predetermined shape, the sintered body is oxidized by reaction with oxygen in the air before the sintered body is taken out of the heating furnace and forged. There is a problem of doing. In particular, in the case of a sintered body, since it is originally porous and has a large number of voids inside, it is possible that oxidation may extend to the inside of the sintered body. Oxidation of such a sintered body leads to a decrease in strength (particularly, fatigue strength), and since the oxide is generally hard,
The life of the forging die may be reduced.
そこで、上記の如き焼結体の酸化を防止する方法とし
て、従来から種々の工夫が凝らされている。例えば、特
開昭57−35601号公報にも開示されているように、金属
粉末焼結体の表面にフェノール樹脂をコーティングした
後加熱することによって、焼結体表面に、フェノール樹
脂が炭化して生成されるカーボン被覆を形成させ、その
後鍛造することにより、鍛造中において外気と焼結体と
を遮断するようにしたものが既に提案されている。Therefore, various methods have been conventionally devised as methods for preventing the oxidation of the sintered body as described above. For example, as disclosed in Japanese Patent Application Laid-Open No. 57-35601, by coating a surface of a metal powder sintered body with a phenol resin and then heating, the phenol resin is carbonized on the surface of the sintered body. There has been already proposed a method in which a carbon coating to be formed is formed and then forged to shut off the outside air and the sintered body during forging.
（発明が解決しようとする課題） 上記公知例の場合、焼結体表面にフェノール樹脂をコ
ーティングするという特別な作業工程を必要とすること
から、焼結加工から鍛造工程への一貫した流れ作業がで
きなくなり、コストアップを招くこととなる。(Problems to be Solved by the Invention) In the case of the above-mentioned known example, since a special work process of coating the surface of the sintered body with the phenol resin is required, an integrated flow work from the sintering process to the forging process is performed. It is not possible to do so, which leads to an increase in cost.
本発明は、上記の点に鑑みてなされたもので、焼結工
程から鍛造工程への流れ作業をとだえさせることなく、
且つ余分な工程の追加によるコストアップを招くことな
く、鍛造工程への搬送途中における鍛造素材の酸化を防
止し得るようにすることを目的とするものである。The present invention has been made in view of the above points, without stopping the flow from the sintering process to the forging process,
It is another object of the present invention to prevent the forging material from being oxidized during the transportation to the forging step without increasing the cost due to the addition of an extra step.
（課題を解決するための手段） 請求項１の発明では、上記課題を解決するための手段
として、焼結体からなる鍛造素材を加熱炉において加熱
した後、加熱炉から出た直後の鍛造素材表面に対してス
ラリー状黒鉛粉末を吹き付け、鍛造素材の温度が鍛造温
度を保持するうちに順次鍛造型に挿入して所望形状に鍛
造するようにしている。(Means for Solving the Problems) In the invention according to claim 1, as a means for solving the above-mentioned problems, a forged material made of a sintered body is heated in a heating furnace and then forged immediately after leaving the heating furnace. Slurry graphite powder is sprayed on the surface, and while the temperature of the forging material is maintained at the forging temperature, the material is sequentially inserted into a forging die to forge into a desired shape.
請求項２の発明では、上記課題を解決するための手段
として、焼結体からなる鍛造素材を加熱炉において加熱
した後、該加熱炉から出た直後の鍛造素材表面に対して
スラリー状黒鉛粉末を吹き付けて、前記鍛造素材表面に
0.1mm〜0.5mmの厚さの黒鉛被膜を形成し、鍛造素材の温
度が鍛造温度を保持するうちに順次鍛造型に挿入して所
望の形状に鍛造するようにしている。In the invention of claim 2, as means for solving the above-mentioned problem, after heating a forged material made of a sintered body in a heating furnace, a slurry-like graphite powder is applied to the surface of the forged material immediately after leaving the heating furnace. Spray on the forged material surface
A graphite coating having a thickness of 0.1 mm to 0.5 mm is formed, and while the temperature of the forging material is maintained at the forging temperature, the material is sequentially inserted into a forging die and forged into a desired shape.
（作 用） 請求項１の発明では、上記手段によって次のような作
用が得られる。(Operation) According to the first aspect of the present invention, the following effects can be obtained by the above means.
即ち、加熱炉から出た直後の焼結体からなる鍛造素材
表面に吹き付けられたスラリー状黒鉛が、鍛造型への搬
送途中において空気中の酸素と選択的に反応して、素材
中への酸素の侵入が防止されることとなり、加熱工程か
ら鍛造工程への鍛造素材搬送途中における素材の酸化が
防止される。In other words, the slurry-like graphite sprayed on the surface of the forged material made of a sintered body immediately after leaving the heating furnace selectively reacts with oxygen in the air during the transportation to the forging die, and the oxygen in the material is removed. Is prevented, and oxidation of the raw material during the transfer of the forged material from the heating process to the forging process is prevented.
請求項２の発明では、上記手段によって次のような作
用が得られる。According to the second aspect of the present invention, the following effects can be obtained by the above means.
即ち、加熱炉から出た直後の焼結体からなる鍛造素材
表面にスラリー状黒鉛を吹き付けることにより形成され
た0.1mm〜0.5mmの厚さの黒鉛被膜が、鍛造型への搬送途
中において空気中の酸素と選択的に反応して、素材中へ
の酸素の侵入が防止されることとなり、加熱工程から鍛
造工程への鍛造素材搬送途中における素材の酸化が防止
される。なお、黒鉛被膜の厚さが0.1mm未満では酸化防
止効果が薄く、0.5mmを超えると体積増加により鍛造型
への挿入が困難となる。That is, a graphite coating having a thickness of 0.1 mm to 0.5 mm formed by spraying slurry-like graphite on the surface of a forged material made of a sintered body immediately after leaving the heating furnace, in the middle of transport to the forging die in the air. Selectively reacts with the oxygen, thereby preventing oxygen from entering the material, thereby preventing oxidation of the material during the transportation of the forged material from the heating step to the forging step. If the thickness of the graphite coating is less than 0.1 mm, the effect of preventing oxidation is small, and if it exceeds 0.5 mm, it becomes difficult to insert it into a forging die due to an increase in volume.
（発明の効果） 請求項１の発明によれば、焼結体からなる鍛造素材を
加熱炉において加熱した後、該加熱炉から出た直後の鍛
造素材を表面に対してスラリー状黒鉛粉末を吹き付け、
鍛造素材の温度が鍛造温度を保持するうちに順次鍛造型
に挿入して所望形状に鍛造するようにしてので、加熱炉
から出た直後の焼結体からなる鍛造素材表面に吹き付け
られたスラリー状黒鉛が、鍛造型への搬送途中において
空気中の酸素と選択的に反応して、素材中への酸素の侵
入が防止され、加熱工程から鍛造工程への鍛造素材搬送
途中における素材の酸化を効果的に防止し得ることとな
り、コストアップにつながるような特別な工程を追加す
ることなく且つ焼結工程から鍛造工程への流れ作業を滞
らせることなく、疲労強度等に優れた鍛造製品を得るこ
とができるという優れた効果がある。(Effect of the Invention) According to the invention of claim 1, after heating a forged material made of a sintered body in a heating furnace, the surface of the forged material immediately after leaving the heating furnace is sprayed with a graphite graphite powder. ,
While the temperature of the forging material is maintained at the forging temperature, it is inserted into a forging die in order to forge to a desired shape, so that the slurry sprayed on the surface of the forging material made of a sintered body immediately after leaving the heating furnace Graphite reacts selectively with oxygen in the air during transport to the forging die, preventing intrusion of oxygen into the material and effectively oxidizing the material during transport of the forged material from the heating process to the forging process. To obtain a forged product excellent in fatigue strength, etc. without adding a special process that leads to cost increase and without delaying the work from the sintering process to the forging process. There is an excellent effect that can be.
また、鍛造素材表面に吹き付けられたスラリー状黒鉛
は、空気中の酸素との反応により全部が消費されること
はなく、残された黒鉛は、鍛造時において鍛造型との潤
滑を良好に維持するための潤滑剤として作用し、鍛造型
の耐久性向上に大いに寄与するという効果もある。In addition, the slurry graphite sprayed on the surface of the forged material is not completely consumed by the reaction with oxygen in the air, and the remaining graphite maintains good lubrication with the forging die during forging. It also has the effect of greatly contributing to improving the durability of the forging die.
請求項２の発明によれば、焼結体からなる鍛造素材を
加熱炉において加熱した後、該加熱炉から出た直後の鍛
造素材表面に対してスラリー状黒鉛粉末を吹き付けて、
前記鍛造素材表面に0.1mm〜0.5mmの厚さの黒鉛被膜を形
成し、鍛造素材の温度が鍛造温度を保持するうちに順次
鍛造型に挿入して所望形状に鍛造するようにしているの
で、加熱炉から出た直後の焼結体からなる鍛造素材表面
にスラリー状黒鉛を吹き付けることにより形成された0.
1mm〜0.5mmの厚さの黒鉛被膜が、鍛造型への搬送途中に
おいて空気中の酸素と選択的に反応して、素材中への酸
素の侵入が防止され、加熱工程から鍛造工程への鍛造素
材搬送途中における素材の酸化を効果的に防止し得るこ
ととなり、必要最小限の厚さの黒鉛被膜の形成により、
コストアップにつながるような特別な工程を追加するこ
となく且つ焼結工程から鍛造工程へ流れ作業を滞らせる
ことなく、疲労強度等に優れた鍛造製品を得ることがで
きるとうい優れた効果がある。According to the invention of claim 2, after heating the forged material made of the sintered body in the heating furnace, the slurry-like graphite powder is sprayed on the surface of the forged material immediately after leaving the heating furnace,
Since a graphite coating having a thickness of 0.1 mm to 0.5 mm is formed on the surface of the forged material, the forged material is inserted into a forging die sequentially while maintaining the forging temperature, and forged to a desired shape. It was formed by spraying slurry graphite on the surface of a forged material consisting of a sintered body immediately after leaving the heating furnace.
The graphite coating with a thickness of 1 mm to 0.5 mm reacts selectively with oxygen in the air during transportation to the forging die, preventing intrusion of oxygen into the material and forging from the heating process to the forging process. It is possible to effectively prevent the oxidation of the material during the material conveyance, and by forming the graphite film of the minimum necessary thickness,
It has an excellent effect that it is possible to obtain a forged product with excellent fatigue strength without adding a special process that leads to a cost increase and without delaying the work from the sintering process to the forging process. .
また、鍛造素材表面に形成された黒鉛被膜は、空気中
の酸素との反応により全部が消費されることはなく、残
された黒鉛被膜は、鍛造時において鋳造型との間の潤滑
を良好に保持するための潤滑剤として作用し、鍛造型の
耐久性向上に大いに寄与するという効果もある。In addition, the graphite coating formed on the surface of the forged material is not completely consumed by the reaction with oxygen in the air, and the remaining graphite coating provides good lubrication between the forging and the casting mold during forging. It acts as a lubricant for holding, and also has the effect of greatly contributing to improving the durability of the forging die.
（実施例） 以下、添付の図面を参照して、本発明方法を説明す
る。Hereinafter, the method of the present invention will be described with reference to the accompanying drawings.
一般に、、金属粉末からなる焼結体を鍛造する、所謂
焼結鍛造法は、第３図図示の工程により行なわれる。Generally, a so-called sintering forging method for forging a sintered body made of a metal powder is performed by the steps shown in FIG.
即ち、焼結鍛造法においては、原料粉末Ｐを混練する
混練工程Ａと、該混練工程Ａにおいて混練された原料を
所定の形状に加圧成形する加圧成形工程Ｂと、該加圧成
形工程Ｂにおいて加圧成形された圧粉体を焼結炉におい
て焼結する焼結工程Ｃと、該焼結工程Ｃにおいて焼結さ
れた焼結体（即ち、鍛造素材）を所望形状の鍛造製品Ｑ
に鍛造加工する焼結鍛造工程Ｄとが順次行なわれる。That is, in the sinter forging method, a kneading step A for kneading the raw material powder P, a pressing step B for pressing the raw material kneaded in the kneading step A into a predetermined shape, and a pressing step A sintering step C in which the green compact pressed in B is sintered in a sintering furnace, and a sintered body (that is, a forged material) sintered in the sintering step C is formed into a forged product Q having a desired shape.
And a sinter forging process D for forging.
前記焼結鍛造工程Ｄにおいては、第１図図示の如く、
焼結後の鍛造素材１を所定温度に加熱する加熱炉２と、
該加熱炉２から出た鍛造素材１を鍛造型（図示省略）に
搬入するための搬送手段３とが用意されている。In the sintering forging step D, as shown in FIG.
A heating furnace 2 for heating the forged material 1 after sintering to a predetermined temperature;
A conveying means 3 for carrying the forging material 1 out of the heating furnace 2 into a forging die (not shown) is provided.
本実施例の加熱炉２は、前工程である焼結工程Ｃの焼
結炉と連続して設けられており、焼結体を所定温度（例
えば、出口温度＝800〜1130℃）に保持するものである
が、焼結炉と別構成としてもよい。この加熱炉２内に
は、鍛造素材1,1・・を矢印Ｘ方向へ搬送するためのベ
ルトコンベア４が設置されている。The heating furnace 2 of this embodiment is provided continuously with the sintering furnace in the sintering step C, which is the previous step, and holds the sintered body at a predetermined temperature (for example, outlet temperature = 800 to 1130 ° C.). However, it may be configured differently from the sintering furnace. In the heating furnace 2, a belt conveyor 4 for transporting the forged materials 1, 1,... In the direction of arrow X is installed.
また、前記搬送手段３は、第１図および第２図図示の
如く、矢印Ｙ方向へ鍛造素材1,1・・を搬送するための
メッシュベルト3aを備えたベルトコンベアからなってお
り、その入口側には、加熱炉２から出た直後の鍛造素材
（即ち、焼結体）１表面にスラリー状黒鉛粉末を噴射す
るための黒鉛噴射手段５が付設されている。該黒鉛噴射
手段５は、前記メッシュベルト3aを囲繞する環状のノズ
ル集合体5aと、該ノズル集合体5aへ黒鉛粉末スラリーを
圧送する供給パイプ5bとを備えている。該供給パイプ5b
は図示しないスラリータンクに接続されている。Further, as shown in FIGS. 1 and 2, the transporting means 3 comprises a belt conveyor having a mesh belt 3a for transporting the forged materials 1, 1,... On the side, graphite injecting means 5 for injecting slurry graphite powder onto the surface of the forged material (that is, sintered body) 1 immediately after leaving the heating furnace 2 is provided. The graphite injection means 5 includes an annular nozzle assembly 5a surrounding the mesh belt 3a, and a supply pipe 5b for pressure-feeding the graphite powder slurry to the nozzle assembly 5a. The supply pipe 5b
Are connected to a slurry tank (not shown).
ついで、図示の装置を使用した本発明方法の手順を説
明する。Next, the procedure of the method of the present invention using the illustrated apparatus will be described.
Cu:2.0重量％、C:0.6％、Fe:残部からなる組成の金属
粉末に、潤滑剤としてステアリン酸亜鉛:0.8重量％を添
加して20分間混練し、その後、5ton/cm2の圧力で圧粉成
形して焼結用圧粉成形体を得た。かくして得られた圧粉
成形体を、ブタン変性ガス雰囲気中において1130℃×30
分で焼結して焼結体からなる鍛造素材１となし、1000℃
まで加熱炉２中で冷却した。そして、加熱炉２から搬送
手段３のメッシュベルト3a上に移された直後の鍛造素材
（即ち、焼結体）１の表面に対して、黒鉛噴射手段５に
よりスラリー状の黒鉛粉末F,F・・を吹き付けた。0.8% by weight of zinc stearate as a lubricant was added to a metal powder having a composition of Cu: 2.0% by weight, C: 0.6%, and Fe: balance and kneaded for 20 minutes, and then at a pressure of 5 ton / cm 2 A green compact was obtained by compacting. The green compact obtained in this manner is heated at 1130 ° C. × 30 in a butane-modified gas atmosphere.
Forging material 1 consisting of a sintered body by sintering in a minute, 1000 ℃
And cooled in the heating furnace 2. Then, the surface of the forged material (that is, the sintered body) 1 immediately after being transferred from the heating furnace 2 onto the mesh belt 3a of the conveying means 3 is applied to the surface of the graphite powder F, F ·・ We sprayed.
かくして得られた鍛造素材１の表面には、0.1〜0.5mm
の厚さの黒鉛被膜が形成された。なお、該黒鉛被膜の厚
さは、0.1mm以下では酸化防止効果が薄く、0.5mm以上で
は体積増加により鍛造型への挿入が困難となる。ここに
使用されるスラリー状黒鉛粉末は、シリコンオイル:60
重量％に対して黒鉛粉末:40重量％を混合して調製され
る。この時、スラリー状黒鉛粉末F,F・・の吹き付けに
より、加熱炉２から出た鍛造素材１の温度低下が気掛か
りであるが、実際には、第４図図示の如く、スラリー状
黒鉛粉末を吹き付けた本実施例のもの（黒丸印）の表面
温度は、黒鉛吹き付けを行わないもの（白丸印）に比べ
て約15℃程度しか低下しておらず、後工程での鍛造に支
障をきたすおそれはなかった。On the surface of the forged material 1 thus obtained, 0.1 to 0.5 mm
A graphite coating having a thickness of 5 mm was formed. When the thickness of the graphite coating is 0.1 mm or less, the effect of preventing oxidation is small. The slurry graphite powder used here is silicone oil: 60
It is prepared by mixing 40% by weight of graphite powder with respect to 100% by weight. At this time, the temperature drop of the forged material 1 coming out of the heating furnace 2 due to the spraying of the slurry graphite powder F, F... The surface temperature of the sprayed embodiment (black circles) is only about 15 ° C lower than that of the one without graphite spraying (open circles), which hinders forging in the subsequent process. It was not.
しかして、上記の如くして表面に黒鉛被膜が形成され
た鍛造素材１を、所定の鍛造型内に挿入し、10ton/cm3
の圧力で所望形状に鍛造した。この時の鍛造素材１の温
度は約880℃であった。Then, the forged material 1 having the graphite coating formed on the surface as described above is inserted into a predetermined forging die, and the forged material is 10 ton / cm 3
At a desired pressure. At this time, the temperature of the forged material 1 was about 880 ° C.
上記の如き鍛造方法による場合、加熱炉２を出た直後
の焼結体からなる鍛造素材１の表面に黒鉛粉末からなる
被膜が形成されるため、この黒鉛が、鍛造型への搬送途
中において空気中の酸素と選択的に反応して、鍛造素材
１中への酸素の侵入が防止されることとなる。従って、
加熱工程から鍛造工程への鍛造素材１の搬送途中におけ
る素材の酸化が効果的に防止されるのである。ちなみ
に、本実施例のもの（黒鉛吹き付けを行ったもの）と、
従来例のもの（即ち、黒鉛吹き付けを行わないもの）と
における酸化による重量増加率（重量％）を測定したと
ころ、下記の如き結果が得られた。In the case of the forging method as described above, a coating made of graphite powder is formed on the surface of the forged material 1 made of a sintered body immediately after leaving the heating furnace 2, so that the graphite becomes air during the transportation to the forging die. This selectively reacts with oxygen in the inside, thereby preventing oxygen from entering the forged material 1. Therefore,
The oxidation of the material during the transportation of the forged material 1 from the heating process to the forging process is effectively prevented. By the way, the thing of this example (one with graphite spraying),
When the rate of weight increase (% by weight) due to oxidation in the conventional example (that is, without graphite spraying) was measured, the following results were obtained.
本実施例 0.02〜0.04 従来例 0.09〜0.12 これによっても、黒鉛吹き付けにより鍛造素材１の酸
化が防止されていることは明白であろう。なお、本実施
例の場合、加熱炉２から搬送手段３のメッシュベルト3a
上に移載された鍛造素材１に対する黒鉛粉末の吹き付け
は、搬送手段３による搬送継続中に行なわれることとな
っているため、コストアップにつながるような特別な工
程を追加する必要もなく且つ焼結工程から鍛造工程への
流れ作業を滞らせることもない。Example 0.02 to 0.04 Conventional Example 0.09 to 0.12 It is apparent from this that oxidation of the forged material 1 is prevented by spraying graphite. In the case of this embodiment, the mesh belt 3a of the conveying means 3 is moved from the heating furnace 2.
Since the spraying of the graphite powder onto the forged material 1 transferred above is to be performed during the continuation of the transportation by the transportation means 3, there is no need to add a special process that leads to an increase in cost, and the firing is not performed. There is no delay in the flow from the sintering process to the forging process.
また、鍛造素材１の表面に吹き付けられたスラリー状
黒鉛は、空気中の酸素との反応により全部が消費される
ことはなく、残された黒鉛は、鍛造時において鍛造型と
の間の潤滑を良好に保持するための潤滑剤として作用
し、鍛造型の耐久性向上に大いに寄与する。Further, the slurry graphite sprayed on the surface of the forging material 1 is not completely consumed by the reaction with oxygen in the air, and the remaining graphite reduces lubrication between the forging die and the forging die. Acts as a lubricant for maintaining good, and greatly contributes to improving the durability of the forging die.
上記実施例では、加熱炉が焼結炉に連続して設けられ
ている場合について説明したが、加熱炉と焼結炉とを兼
用するように構成してもよい。In the above embodiment, the case where the heating furnace is provided continuously to the sintering furnace has been described. However, the heating furnace and the sintering furnace may be configured to serve both functions.
第１図は本発明の鍛造方法における焼結鍛造工程の要部
を示す概略図、第２図は第１図の要部拡大斜視図、第３
図は本発明の鍛造方法における工程順序図、第４図は本
発明実施例（即ち、黒鉛吹き付けを行ったもの）と従来
例（即ち、黒鉛吹き付けを行わないもの）とにおける経
時温度変化を示す特性図である。 １……鍛造素材 ２……加熱炉 ３……搬送手段 ５……黒鉛噴射手段 Ｆ……黒鉛粉末FIG. 1 is a schematic view showing a main part of a sintering forging process in a forging method of the present invention, FIG. 2 is an enlarged perspective view of a main part of FIG.
FIG. 4 shows a process sequence diagram in the forging method of the present invention, and FIG. 4 shows a temperature change over time in the embodiment of the present invention (that is, one in which graphite is sprayed) and the conventional example (that is, one in which graphite is not sprayed). It is a characteristic diagram. DESCRIPTION OF SYMBOLS 1 ... Forging material 2 ... Heating furnace 3 ... Conveying means 5 ... Graphite injection means F ... Graphite powder
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B22F 3/00 - 3/26 B21J 1/02,1/06,5/00──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B22F 3/00-3/26 B21J 1 / 02,1 / 06,5 / 00
Claims (2)
加熱した後、該加熱炉から出た直後の鍛造素材表面に対
してスラリー状黒鉛粉末を吹き付け、鍛造素材の温度が
鍛造温度を保持するうちに順次鍛造型に挿入して所望形
状に鍛造することを特徴とする鍛造方法。1. After heating a forged material made of a sintered body in a heating furnace, a slurry graphite powder is sprayed on the surface of the forged material immediately after leaving the heating furnace, and the temperature of the forged material maintains the forging temperature. A forging method characterized by sequentially inserting into a forging die and forging into a desired shape.
加熱した後、該加熱炉から出た直後の鍛造素材表面に対
してスラリー状黒鉛粉末を吹き付けて、前記鍛造素材表
面に0.1mm〜0.5mmの厚さの黒鉛被膜を形成し、鍛造素材
の温度が鍛造温度を保持するうちに順次鍛造型に挿入し
て所望形状に鍛造することを特徴とする鍛造方法。2. A forged material made of a sintered body is heated in a heating furnace, and then a graphite graphite powder is sprayed on the surface of the forged material immediately after leaving the heating furnace. A forging method comprising forming a graphite coating having a thickness of 0.5 mm, and sequentially inserting the graphite coating into a forging die while maintaining the forging temperature at the forging temperature to forge into a desired shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1194739A JP2840304B2 (en) | 1989-07-26 | 1989-07-26 | Forging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1194739A JP2840304B2 (en) | 1989-07-26 | 1989-07-26 | Forging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0356602A JPH0356602A (en) | 1991-03-12 |
| JP2840304B2 true JP2840304B2 (en) | 1998-12-24 |
Family
ID=16329425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1194739A Expired - Fee Related JP2840304B2 (en) | 1989-07-26 | 1989-07-26 | Forging method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2840304B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021294B (en) * | 2010-12-16 | 2012-03-21 | 山西太钢不锈钢股份有限公司 | Thermal processing method of NAK80 steel plates |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5219105A (en) * | 1975-08-06 | 1977-02-14 | Topy Ind Ltd | Nonoxidative sintering and forging method |
| JPS5735601A (en) * | 1980-08-13 | 1982-02-26 | Daido Steel Co Ltd | Sintering and forging method |
| JPS61126940A (en) * | 1984-11-21 | 1986-06-14 | Musashi Seimitsu Kogyo Kk | Manufacture of bevel gear by warm forging |
-
1989
- 1989-07-26 JP JP1194739A patent/JP2840304B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0356602A (en) | 1991-03-12 |
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