JP3499370B2 - Sintering cold forging method - Google Patents
Sintering cold forging methodInfo
- Publication number
- JP3499370B2 JP3499370B2 JP12279996A JP12279996A JP3499370B2 JP 3499370 B2 JP3499370 B2 JP 3499370B2 JP 12279996 A JP12279996 A JP 12279996A JP 12279996 A JP12279996 A JP 12279996A JP 3499370 B2 JP3499370 B2 JP 3499370B2
- Authority
- JP
- Japan
- Prior art keywords
- preform
- cold forging
- lubricant
- density
- preliminary
- 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
【０００１】[0001]
【発明の属する技術分野】本発明は、各種焼結製品を製
造する焼結冷間鍛造方法に関し、特に高密度組成の焼結
製品を得ることができる焼結冷間鍛造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sinter cold forging method for producing various sintered products, and more particularly to a sinter cold forging method capable of obtaining a sintered product having a high density composition.
【０００２】[0002]
【従来の技術】焼結冷間鍛造方法は、金属粉を圧縮成形
して冷間鍛造用焼結プリフォームを形成した後、このプ
リフォームに冷間鍛造及び焼結を施すことにより、最終
の焼結製品を得るものであり、機械的強度の高い製品を
得るために、高密度組成の焼結製品を得ることが望まれ
ている。2. Description of the Related Art A sinter cold forging method is a method in which a metal powder is compression-molded to form a sinter preform for cold forging, and then this preform is subjected to cold forging and sintering to obtain a final product. It is intended to obtain a sintered product, and in order to obtain a product having high mechanical strength, it is desired to obtain a sintered product having a high density composition.
【０００３】ところで、この焼結冷間鍛造方法において
は、プリフォームの成形及び冷間鍛造はダイス内で行わ
れるため、このプリフォームとダイスとの焼付き防止に
注意を払う必要がある。By the way, in this sintering cold forging method, since the preform is molded and cold forged in the die, it is necessary to pay attention to the prevention of seizure between the preform and the die.
【０００４】そこで、例えば、特開平１−１２３００５
号公報には、潤滑剤を１％添加混合した金属粉を圧縮成
形した予備プリフォームを仮焼結して、冷間鍛造用焼結
プリフォームを形成し、この焼結プリフォームに潤滑剤
を塗布した後、冷間鍛造及び焼結をする改良された技術
が開示してある。この改良された技術によれば、前記冷
間鍛造の工程を仮圧縮成形する工程と本圧縮成形する工
程とから構成し、これら仮圧縮成形工程と本圧縮成形工
程との間で、即ち本圧縮成形工程の前に焼結プリフォー
ムから潤滑剤を負圧によって吸引除去するようにしてあ
る。これによって、プリフォーム内に残留する潤滑油が
プリフォーム内部の微小空隙の圧潰消滅を妨げてポーラ
ス状となることを防止することにより、製品の密度を高
めるようにしてある。その結果、冷間鍛造後に、密度が
７．４〜７．５ｇ／ｃｍ３の製品が得られる。Therefore, for example, Japanese Laid-Open Patent Publication No. 1-123005.
In the publication, a preliminary preform obtained by compression-molding a metal powder containing 1% of a lubricant added and mixed is provisionally sintered to form a sintered preform for cold forging, and a lubricant is added to the sintered preform. An improved technique of cold forging and sintering after coating is disclosed. According to this improved technique, the cold forging step is composed of a step of temporary compression molding and a step of main compression molding, and between the temporary compression molding step and the main compression molding step, that is, the main compression molding step. Before the molding step, the lubricant is sucked and removed from the sintered preform by negative pressure. This prevents the lubricating oil remaining in the preform from collapsing and disappearing of the minute voids inside the preform to prevent it from becoming porous, thereby increasing the density of the product. As a result, a product having a density of 7.4 to 7.5 g / cm 3 is obtained after cold forging.
【０００５】即ち、前記従来例によれば、予備プリフォ
ームを圧縮成形する金属粉に１％の潤滑剤を添加してい
る。これは、予備プリフォームを圧縮成形する場合に、
予備プリフォームとダイスとの間の焼付きを防止するた
めに有効なものであるけれども、この潤滑剤が圧縮成形
時におけるプリフォーム内部の微小空間の圧潰消滅の妨
げとなり、高密度の予備プリフォームが得られない。こ
のため、前記予備プリフォームを冷間鍛造するときの焼
付き防止のために予備プリフォームの表面に潤滑剤を塗
布すると、この潤滑剤が予備プリフォームの内部に侵入
して、冷間鍛造時の高密度化の妨げとなる。そこで、前
記従来例によれば、この潤滑剤を冷間鍛造の本圧縮成形
工程の前に吸引除去して高密度化を図るのであり、これ
によって冷間鍛造後に得られる製品の密度は７．４〜
７．５ｇ／ｃｍ３程度となるのである。That is, according to the conventional example, 1% of lubricant is added to the metal powder for compression molding the preform. This is when the compression molding of the preliminary preform,
Although it is effective in preventing seizure between the preform and the die, this lubricant hinders the collapse of the minute spaces inside the preform during compression molding, resulting in a high-density preform. Can't get Therefore, if a lubricant is applied to the surface of the preliminary preform in order to prevent seizure during cold forging of the preliminary preform, this lubricant penetrates into the inside of the preliminary preform, and during cold forging. It becomes a hindrance to high density. Therefore, according to the conventional example, the lubricant is sucked and removed before the main compression molding step of cold forging to increase the density, and the density of the product obtained after cold forging is 7. 4-
It is about 7.5 g / cm 3 .
【０００６】[0006]
【発明が解決しようとする課題】ところで、前記従来例
の製造方法によって、更に高密度組成の焼結製品を得よ
うとすると、冷間鍛造の成形圧力を高めなければなら
ず、冷間鍛造時に製品の割れ等が発生する虞がある。発
明者らの研究によれば、より高密度組成の焼結製品を得
るには、冷間鍛造前の予備プリフォームの密度を高くし
ておくことが重要であることを知見した。By the way, in order to obtain a sintered product having a higher density composition by the manufacturing method of the above-mentioned conventional example, the forming pressure of cold forging must be increased. There is a risk of product cracking. According to the research conducted by the inventors, it has been found that in order to obtain a sintered product having a higher density composition, it is important to increase the density of the preliminary preform before cold forging.
【０００７】しかしながら、前記従来例にあっては、予
備プリフォームを圧縮成形する金属粉に１％添加した潤
滑剤が圧縮成形時におけるプリフォーム内部の微小空間
の圧潰消滅の妨げとなり、高密度の予備プリフォームを
得ることが困難になる。その結果、冷間鍛造後に、高密
度組成の焼結製品を得ることが困難となるのである。However, in the above-mentioned conventional example, the lubricant added with 1% to the metal powder for compression molding of the preform hinders the collapse of the minute spaces inside the preform during the compression molding, resulting in a high density. It becomes difficult to obtain a preliminary preform. As a result, it becomes difficult to obtain a sintered product having a high density composition after cold forging.
【０００８】本発明は上記従来の実情に鑑みて案出され
たもので、更に高密度組成の焼結製品を得ることができ
る焼結冷間鍛造方法を提供することを目的とする。The present invention has been devised in view of the above conventional circumstances, and an object of the present invention is to provide a sintering cold forging method capable of obtaining a sintered product having a high density composition.
【０００９】[0009]
【課題を解決するための手段】そこで、請求項１記載の
発明は、金属粉をダイス内で仮圧縮成形して予備プリフ
ォームを形成する仮成形工程と、その後直接、前記予備
プリフォームに潤滑剤を塗布する潤滑剤塗布工程と、前
記潤滑剤を塗布した予備プリフォームをダイス内で本圧
縮成形する本成形工程と、前記本圧縮成形した予備プリ
フォームを仮焼結して冷間鍛造用焼結プリフォームを得
る仮焼結工程と、前記焼結プリフォームを冷間鍛造する
冷間鍛造工程と、前記冷間鍛造後の焼結プリフォームを
本焼結する本焼結工程と、から構成してある。Therefore, according to the invention of claim 1, a preliminary forming step of forming a preliminary preform by temporarily compression-molding metal powder in a die, and then directly lubricating the preliminary preform. Lubricant application step of applying a lubricant, main forming step of main compression molding of the preliminary preform coated with the lubricant in a die, and temporary forging of the main compression molded preform for cold forging From a preliminary sintering step of obtaining a sintered preform, a cold forging step of cold forging the sintered preform, and a main sintering step of main sintering the sintered preform after the cold forging, Configured.
【００１０】また、請求項２記載の発明は、前記予備プ
リフォームを本圧縮した前記本成形工程の密度が、７．
４ｇ／ｃｍ３以上であることを特徴とする。The invention according to claim 2 is characterized in that the density of the main molding step in which the preliminary preform is main-compressed is 7.
It is characterized by being 4 g / cm 3 or more.
【００１１】ここで、密度の高い焼結製品を得るために
は、前記金属粉には潤滑剤を添加しないのが好ましい
が、潤滑剤を混合添加する場合には０．６％以下とす
る。この金属粉をダイス内で仮圧縮成形して得られる予
備プリフォームの密度は、５．５ｇ／ｃｍ３程度、好ま
しくは５．０〜６．５ｇ／ｃｍ３とする。この仮成形工
程で予備プリフォームの密度を高くすると、潤滑剤塗布
工程で潤滑剤が予備プリフォーム内に侵入することが可
及的に防止できる反面、金属粉に添加する潤滑剤が少量
であるために、仮成形中にプリフォームとダイスとの間
で焼付きを生じ易くなるものである。Here, in order to obtain a sintered product having a high density, it is preferable not to add a lubricant to the metal powder, but when the lubricant is mixed and added, the content is 0.6% or less. The density of the pre preform metal powder obtained by temporary compression molded in die, 5.5 g / cm 3, preferably about a 5.0~6.5g / cm 3. When the density of the preliminary preform is increased in this temporary forming step, the lubricant can be prevented from entering the preliminary preform in the lubricant application step as much as possible, but a small amount of the lubricant is added to the metal powder. Therefore, seizure easily occurs between the preform and the die during the temporary forming.
【００１２】前記予備プリフォームに塗布する潤滑剤は
ステアリン酸亜鉛等の通常の冷間鍛造に用いられる各種
潤滑剤が適用可能である。As the lubricant applied to the preliminary preform, various lubricants used in ordinary cold forging such as zinc stearate can be applied.
【００１３】前記本成形工程では、潤滑剤を塗布した予
備プリフォームを本圧縮成形して、プリフォームの密度
を、好ましくは７．４ｇ／ｃｍ３以上に高める。この本
成形工程での密度が低いと、冷間鍛造工程の前に冷間鍛
造用焼結プリフォームに塗布する潤滑剤がプリフォーム
内に侵入することになり、冷間鍛造工程で製品の密度を
高めるうえで好ましくない。In the main molding step, a preliminary preform coated with a lubricant is main compression molded to increase the density of the preform to preferably 7.4 g / cm 3 or more. If the density in this main forming process is low, the lubricant applied to the cold forging sintered preform before the cold forging process will penetrate into the preform, and the product density in the cold forging process will increase. Is not preferable for increasing the
【００１４】前記仮焼結工程は、好ましくは７００〜９
００℃以下で行い、カーボンの拡散を防止し、所定の硬
さの冷間鍛造用焼結プリフォームを得る。The preliminary sintering step is preferably 700-9.
It is carried out at a temperature of 00 ° C. or less to prevent carbon diffusion and obtain a sintered forging for cold forging having a predetermined hardness.
【００１５】前記冷間鍛造工程では、冷間鍛造用焼結プ
リフォームに所定の潤滑剤を塗布した後、この冷間鍛造
用焼結プリフォームがダイス内で加圧成形される。前記
冷間鍛造工程では、予備プリフォームの密度が７．４ｇ
／ｃｍ３以上に高められているから、７．５ｇ／ｃｍ３
以上の密度に鍛造することができ、高密度組成の製品が
容易に得られる。In the cold forging step, a predetermined lubricant is applied to the cold forging sintered preform, and then the cold forging sintered preform is pressure-molded in a die. In the cold forging step, the density of the preliminary preform is 7.4 g.
/ G 3 / cm 3 or higher, so 7.5 g / cm 3
It can be forged to the above density, and a product having a high density composition can be easily obtained.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて詳述する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.
【００１７】図１は本発明の実施の形態を示す焼結冷間
鍛造方法の工程説明図である。図において、１は仮成形
工程で、この仮成形工程１では、金属粉を仮成形ダイス
内に充填し、このダイス内で圧粉成形して予備プリフォ
ームを成形する。前記金属粉に潤滑剤を混合添加する場
合には０．６％以下とする。潤滑剤の量を増加させる
と、得られるプリフォームの密度を高めることが困難に
なる。前記仮成形工程では密度が５．０〜６．５ｇ／ｃ
ｍ３の予備プリフォームを成形する。FIG. 1 is a process explanatory view of a sintering cold forging method showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a temporary forming step. In the temporary forming step 1, a metal powder is filled in a temporary forming die, and the preliminary preform is formed by powder compacting in the die. When a lubricant is mixed and added to the metal powder, the content is 0.6% or less. Increasing the amount of lubricant makes it difficult to increase the density of the resulting preform. In the temporary forming step, the density is 5.0 to 6.5 g / c.
molding a preliminary preform of m 3.
【００１８】２は潤滑剤塗布工程である。この潤滑剤塗
布工程２では、前記仮成形工程１で得られた予備プリフ
ォームの所定箇所に、ステアリン酸亜鉛等の潤滑剤を塗
布する。Reference numeral 2 is a lubricant coating step. In the lubricant applying step 2, a lubricant such as zinc stearate is applied to predetermined portions of the preliminary preform obtained in the temporary forming step 1.
【００１９】３は本成形工程である。この本成形工程３
では、潤滑剤を塗布した予備プリフォームを本成形ダイ
ス内に挿入して本圧縮成形し、予備プリフォームの密度
を７．４ｇ／ｃｍ３以上に高める。Reference numeral 3 is a main forming process. This main molding process 3
Then, the preliminary preform coated with the lubricant is inserted into the main forming die and the main compression molding is performed to increase the density of the preliminary preform to 7.4 g / cm 3 or more.
【００２０】４は、前記本成形工程３で密度が高められ
た予備プリフォームを仮焼結する仮焼結工程である。こ
の仮焼結工程４は、７００〜９００℃の還元雰囲気中で
行い、カーボンの拡散を防止し、所定の硬さの冷間鍛造
用プリフォームを得る。Reference numeral 4 is a temporary sintering step of temporarily sintering the preliminary preform whose density has been increased in the main forming step 3. This pre-sintering step 4 is performed in a reducing atmosphere at 700 to 900 ° C. to prevent carbon diffusion and obtain a cold forging preform having a predetermined hardness.
【００２１】５は冷間鍛造工程である。この冷間鍛造工
程５は、前記仮焼結工程４を完了した冷間鍛造用プリフ
ォームの所定箇所に潤滑剤を塗布し、この冷間鍛造用プ
リフォームを鍛造ダイス内に挿入して行う。この場合の
成形圧力は最終製品の密度によって各種選択可能である
けれども、密度が７．５ｇ／ｃｍ３以上の製品を得るた
めには、７ｔｏｎ／ｃｍ２以上の圧力で加圧成形（鍛
造）される。Reference numeral 5 is a cold forging step. This cold forging step 5 is performed by applying a lubricant to a predetermined portion of the cold forging preform that has undergone the preliminary sintering step 4 and inserting the cold forging preform into a forging die. Although the molding pressure in this case can be variously selected according to the density of the final product, in order to obtain a product having a density of 7.5 g / cm 3 or more, pressure molding (forging) is performed at a pressure of 7 ton / cm 2 or more. It
【００２２】前記冷間鍛造工程５での冷間鍛造に先立
ち、通常の冷間鍛造で行われているのと同様に、冷間鍛
造用プリフォームの所定箇所に潤滑剤を塗布するのであ
るが、この実施形態によれば、冷間鍛造用プリフォーム
の密度が７．４ｇ／ｃｍ３以上に高められているので、
塗布した潤滑剤がプリフォームの内部に侵入することな
く表面に滞留する。これによって、潤滑剤が冷間鍛造時
のプリフォームとダイスとの間を潤滑して焼付きを防止
することができ、効果的な冷間鍛造作業が成就される。
また、潤滑剤がプリフォーム内に侵入することがないか
ら、プリフォーム内に侵入した潤滑剤が鍛造時の微小空
隙の圧潰消滅を妨げて製品の密度を高めることを困難と
することが、有利に回避される。Prior to the cold forging in the cold forging step 5, a lubricant is applied to predetermined portions of the cold forging preform in the same manner as in the ordinary cold forging. According to this embodiment, since the density of the cold forging preform is increased to 7.4 g / cm 3 or more,
The applied lubricant stays on the surface without penetrating inside the preform. As a result, the lubricant can lubricate between the preform and the die during cold forging to prevent seizure, and an effective cold forging operation is accomplished.
Further, since the lubricant does not penetrate into the preform, it is advantageous that the lubricant that has penetrated into the preform makes it difficult to increase the density of the product by preventing the collapse of the minute voids during forging. To be avoided.
【００２３】これによって、前記冷間鍛造工程５では、
密度が７．５ｇ／ｃｍ３以上の製品を容易に得ることが
できる。Thus, in the cold forging step 5,
A product having a density of 7.5 g / cm 3 or more can be easily obtained.
【００２４】前記冷間鍛造工程５を終えた製品は、本焼
結工程６において１１００℃〜１３００℃で焼結され、
更に熱処理工程７において所定の熱処理が施される。The product which has finished the cold forging step 5 is sintered at 1100 ° C. to 1300 ° C. in the main sintering step 6,
Further, in the heat treatment step 7, a predetermined heat treatment is performed.
【００２５】これによって、焼結体の密度が７．５ｇ／
ｃｍ３以上の高密度組成の製品が容易に得られる。As a result, the density of the sintered body is 7.5 g /
A product with a high density composition of cm 3 or more can be easily obtained.
【００２６】[0026]
【実施例】具体的に次のような条件で実験した結果につ
いて説明する。EXAMPLES The results of experiments conducted under the following conditions will be specifically described.
【００２７】０．２％の潤滑剤を混合添加した金属粉を
ダイス内に充填して圧粉成形し、密度が５．５ｇ／ｃｍ
３の予備プリフォームを成形した。この予備プリフォー
ムにステアリン酸亜鉛を塗布した後、本成形工程３のダ
イス内で８ｔｏｎ／ｃｍ２の圧力を以て加圧成形するこ
とにより、密度が７．４５ｇ／ｃｍ３の予備プリフォー
ムが得られた。Metallic powder mixed with 0.2% of lubricant was filled in a die and compacted to have a density of 5.5 g / cm.
3 preforms were molded. After applying zinc stearate to this preliminary preform, the preliminary preform having a density of 7.45 g / cm 3 was obtained by press-molding with a pressure of 8 ton / cm 2 in the die of the main molding step 3. It was
【００２８】ここで、前記金属粉に混合添加する潤滑剤
の量を変化させ、潤滑剤の混合添加量が０．２％，０．
３％，０．４％，０．５％，０．７５％である金属粉を
それぞれ仮圧縮成形して各種の予備プリフォームを形成
し、この予備プリフォームを本圧縮成形した場合に、成
形圧力と密度との関係は図２に示すような結果が得られ
た。即ち、潤滑剤を０．６％混合添加した場合には成形
圧力を１０ｔｏｎ／ｃｍ２とすることにより密度が７．
４１ｇ／ｃｍ３のプリフォームが得られた。つまり、成
形圧力を１０ｔｏｎ／ｃｍ２として、密度が７．４ｇ／
ｃｍ３の予備プリフォームを得るためには、金属粉に潤
滑剤を０．６％混合添加することが可能である結果が得
られた。Here, the amount of the lubricant mixed and added to the metal powder is changed so that the mixed addition amount of the lubricant is 0.2%, 0.
3%, 0.4%, 0.5%, 0.75% metal powders are respectively temporarily compression molded to form various preliminary preforms, and when these preliminary preforms are finally compression molded, they are molded. The relationship between the pressure and the density was obtained as shown in FIG. That is, when 0.6% of the lubricant was mixed and added, the density was adjusted to 7 ton by setting the molding pressure to 10 ton / cm 2 .
A preform of 41 g / cm 3 was obtained. That is, when the molding pressure is 10 ton / cm 2 , the density is 7.4 g /
It was possible to add 0.6% of lubricant to the metal powder in order to obtain a preform of cm 3 .
【００２９】前記予備プリフォーム、即ち密度が７．４
５ｇ／ｃｍ３の予備プリフォームを７００〜９００℃の
還元雰囲気中で仮焼結して、冷間鍛造用焼結プリフォー
ムを形成し、この冷間鍛造用焼結プリフォームに潤滑剤
を塗布した後、ダイス中で７ｔｏｎ／ｃｍ２の圧力を以
て加圧成形（冷間鍛造）した結果、密度が７．６２ｇ／
ｃｍ３の製品が得られた。また、成形圧力を１０ｔｏｎ
／ｃｍ２に上昇させた場合には、密度が７．６４ｇ／ｃ
ｍ３の製品が得られた。また、成形圧力を１４ｔｏｎ／
ｃｍ２に上昇させた場合には、密度が７．６６ｇ／ｃｍ
３の製品が得られた。The preliminary preform, ie having a density of 7.4
A preliminary preform of 5 g / cm 3 is pre-sintered in a reducing atmosphere at 700 to 900 ° C. to form a cold forging sintered preform, and a lubricant is applied to this cold forging sintered preform. After that, pressure molding (cold forging) with a pressure of 7 ton / cm 2 in the die resulted in a density of 7.62 g /
A product of cm 3 was obtained. Also, the molding pressure is 10 ton
When increased to / cm 2 , the density is 7.64 g / c
A product of m 3 was obtained. In addition, the molding pressure is 14 ton /
When raised to cm 2 , the density is 7.66 g / cm
3 products were obtained.
【００３０】[0030]
【発明の効果】以上、詳細に説明したように、本発明に
よれば、高密度組成の焼結製品が容易に得られる。As described above in detail, according to the present invention, a sintered product having a high density composition can be easily obtained.
【図１】本発明の実施の形態を示す冷間鍛造焼結方法の
工程説明図である。FIG. 1 is a process explanatory view of a cold forging and sintering method showing an embodiment of the present invention.
【図２】金属粉に混合添加する潤滑剤の量をパラメータ
として、本成形工程において得られた、成形圧力と密度
との関係を示す線図である。FIG. 2 is a diagram showing the relationship between the molding pressure and the density obtained in the main molding step, with the amount of the lubricant mixed and added to the metal powder as a parameter.
１ 仮成形工程 ２ 潤滑剤塗布工程 ３ 本成形工程 ４ 仮焼結工程 ５ 冷間鍛造工程 ６ 本焼結工程 1 Temporary molding process 2 Lubricant application process 3 main molding process 4 Temporary sintering process 5 Cold forging process 6 sintering process
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−19403（ＪＰ，Ａ) 特開 平４−231404（ＪＰ，Ａ) 特開 平１−123005（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22F 3/03 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-19403 (JP, A) JP-A-4-231404 (JP, A) JP-A-1-123005 (JP, A) (58) Field (Int.Cl. 7 , DB name) B22F 3/03
Claims (2)
プリフォームを形成する仮成形工程と、 その後直接、前記予備プリフォームに潤滑剤を塗布する
潤滑剤塗布工程と、 前記潤滑剤を塗布した予備プリフォームをダイス内で本
圧縮成形する本成形工程と、 前記本圧縮成形した予備プリフォームを仮焼結して冷間
鍛造用焼結プリフォームを得る仮焼結工程と、 前記焼結プリフォームを冷間鍛造する冷間鍛造工程と、 前記冷間鍛造後の焼結プリフォームを本焼結する本焼結
工程と、から構成したことを特徴とする焼結冷間鍛造方
法。1. A temporary forming step of forming a preliminary preform by temporarily compression-molding metal powder in a die, a lubricant applying step of directly applying a lubricant to the preliminary preform, and a lubricant applying step. A main forming step of subjecting the applied preliminary preform to main compression molding in a die, a temporary sintering step of provisionally sintering the main compression molded preliminary preform to obtain a sintered preform for cold forging, and the firing A sintered cold forging method comprising: a cold forging step of cold forging the bound preform; and a main sintering step of main sintering the sintered preform after the cold forging.
程の密度が、７．４ｇ／ｃｍ３以上であることを特徴と
する請求項１記載の焼結冷間鍛造方法。2. The sintering cold forging method according to claim 1, wherein the density of the main forming step of main compression of the preliminary preform is 7.4 g / cm 3 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12279996A JP3499370B2 (en) | 1996-04-22 | 1996-04-22 | Sintering cold forging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12279996A JP3499370B2 (en) | 1996-04-22 | 1996-04-22 | Sintering cold forging method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003347518A Division JP2004091929A (en) | 2003-10-06 | 2003-10-06 | Sintering and cold forging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09287005A JPH09287005A (en) | 1997-11-04 |
| JP3499370B2 true JP3499370B2 (en) | 2004-02-23 |
Family
ID=14844928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12279996A Expired - Lifetime JP3499370B2 (en) | 1996-04-22 | 1996-04-22 | Sintering cold forging method |
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| Country | Link |
|---|---|
| JP (1) | JP3499370B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3871781B2 (en) * | 1997-10-14 | 2007-01-24 | 株式会社日立製作所 | Metallic powder molding material and manufacturing method thereof |
| DE19850326A1 (en) * | 1998-11-02 | 2000-05-04 | Gkn Sinter Metals Holding Gmbh | Process for producing a sintered component with reshaping of the green body |
| JP3869620B2 (en) * | 1999-04-16 | 2007-01-17 | 株式会社日立製作所 | Alloy steel powder molding material, alloy steel powder processed body, and manufacturing method of alloy steel powder molding material |
| JP3871825B2 (en) * | 1999-04-16 | 2007-01-24 | 株式会社日立製作所 | Recompression molded body of metallic powder molding material, sintered body obtained from the recompression molded body, and production method thereof |
| JP2004091929A (en) * | 2003-10-06 | 2004-03-25 | Hitachi Unisia Automotive Ltd | Sintering and cold forging method |
| US8469003B2 (en) * | 2010-09-10 | 2013-06-25 | Burgess • Norton Mfg. Co., Inc. | Fuel injector clamp |
| JP2015176901A (en) * | 2014-03-13 | 2015-10-05 | Ntn株式会社 | Method of producing powder magnetic core |
| CN107000056A (en) * | 2014-11-21 | 2017-08-01 | 麦加戴恩国际有限公司 | Pre-sintered soldering |
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1996
- 1996-04-22 JP JP12279996A patent/JP3499370B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09287005A (en) | 1997-11-04 |
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