JPH09287005A - Method for sintering and cold forging - Google Patents
Method for sintering and cold forgingInfo
- Publication number
- JPH09287005A JPH09287005A JP12279996A JP12279996A JPH09287005A JP H09287005 A JPH09287005 A JP H09287005A JP 12279996 A JP12279996 A JP 12279996A JP 12279996 A JP12279996 A JP 12279996A JP H09287005 A JPH09287005 A JP H09287005A
- Authority
- JP
- Japan
- Prior art keywords
- cold forging
- preform
- lubricant
- sintered preform
- sintering
- 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.)
- Granted
Links
Landscapes
- Powder Metallurgy (AREA)
Abstract
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
形した予備焼結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 presintered preform obtained by compression-molding metal powder mixed with 1% of a lubricant is pre-sintered to form a sintered preform for cold forging, and the sintered preform is lubricated. An improved technique of cold forging and sintering after applying the agent 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 / cm3 is obtained after cold forging.
【０００５】即ち、前記従来例によれば、予備焼結プリ
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、予備焼結プリフォームを圧縮成形する
場合に、予備焼結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、高密度の予備焼結プリフォーム
が得られない。このため、前記予備焼結プリフォームを
冷間鍛造するときの焼付き防止のために予備焼結プリフ
ォームの表面に潤滑剤を塗布すると、この潤滑剤が予備
焼結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 above-mentioned conventional example, 1% of lubricant is added to the metal powder for compression molding the pre-sintered preform. This is effective for preventing seizure between the pre-sintered preform and the die when the pre-sintered preform is compression-molded, but this lubricant does not prevent the pre-sintered preform from being compressed. It becomes difficult to eliminate the collapse of the internal minute space, and a high-density pre-sintered preform cannot be obtained. Therefore, when a lubricant is applied to the surface of the presintered preform to prevent seizure during cold forging of the presintered preform, the lubricant penetrates into the presintered preform. This hinders high density during cold forging. 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. It is about 4 to 7.5 g / cm3.
【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、冷間鍛造前の予備焼結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 it is important to increase the density of the pre-sintered preform before cold forging in order to obtain a sintered product having a higher density composition.
【０００７】しかしながら、前記従来例にあっては、予
備焼結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、高密度の予備焼結プリフ
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 the pre-sintered preform hinders the collapse of the minute spaces inside the preform during compression molding, which is high. It becomes difficult to obtain a presintered preform of high density. 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焼結プリ
フォームを形成する仮成形工程と、前記予備焼結プリフ
ォームに潤滑剤を塗布する潤滑剤塗布工程と、前記潤滑
剤を塗布した予備焼結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焼結プ
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。SUMMARY OF THE INVENTION Therefore, according to the invention of claim 1, a preliminary forming step of forming a pre-sintered preform by pre-compressing metal powder in a die, and lubricating the pre-sintered preform. A lubricant application step of applying a lubricant, a main forming step of main compression molding the pre-sintered preform coated with the lubricant in a die, and a preliminary sintering of the main compression-molded pre-sintered preform. Temporary sintering step for obtaining a sintered preform for cold forging, cold forging step for cold forging the sintered preform, and main sintering for main sintering the sintered preform after the cold forging It is composed of steps.
【００１０】また、請求項２記載の発明は、金属粉をダ
イス内で仮圧縮成形し、密度が５．０〜６．５ｇ／ｃｍ
3 である予備焼結プリフォームを形成する仮成形工程
と、前記予備焼結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焼結プリフォ
ームをダイス内で本圧縮成形し、密度を７．４ｇ／ｃｍ
3 以上に高める本成形工程と、前記本圧縮成形した予備
焼結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。According to a second aspect of the present invention, the metal powder is pre-compressed in a die and has a density of 5.0 to 6.5 g / cm.
The preliminary forming step for forming the pre-sintered preform, which is No. 3, the lubricant application step for applying the lubricant to the pre-sintered preform, and the pre-sintered preform coated with the lubricant in the die. Compression molded, density 7.4 g / cm
3 The main forming step to increase to more than 3 above, the pre-sintering preform obtained by the main compression forming to obtain a sintered preform for cold forging, and the cold forging The cold forging step and the main sintering step of main sintering the sintered preform after the cold forging are performed.
【００１１】また、請求項３記載の発明は、請求項１乃
至請求項２記載の構成の金属粉に、潤滑剤を０〜０．６
％混合した構成にしてある。According to a third aspect of the present invention, a lubricant is added to the metal powder of the first or second aspect of the invention in an amount of 0 to 0.6.
% The composition is mixed.
【００１２】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
備焼結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
形工程で予備焼結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焼結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 set to 0.6% or less. The density of the pre-sintered preform obtained by temporarily compression-molding this metal powder in a die is about 5.5 g / cm3,
It is preferably 5.0 to 6.5 g / cm 3. If the density of the pre-sintered preform is increased in this temporary forming step, the lubricant can be prevented from entering the pre-sintered preform in the lubricant application step as much as possible, but the lubricant added to the metal powder. Because of the small amount, seizure is likely to occur between the preform and the die during the temporary forming.
【００１３】前記予備焼結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 pre-sintered preform, various lubricants used in ordinary cold forging such as zinc stearate can be applied.
【００１４】前記本成形工程では、潤滑剤を塗布した予
備焼結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 forming step, the pre-sintered preform coated with the 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
【００１５】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.
【００１６】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、予備焼結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／ｃ
ｍ3 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 pre-sintered preform is 7.
7.5g / c because it is increased to 4g / cm3 or more
It can be forged to a density of m3 or more, and a product of high density composition can be easily obtained.
【００１７】[0017]
【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。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１８】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焼結プリ
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／
ｃｍ3 の予備焼結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 sintering 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 /
A cm3 presintered preform is molded.
【００１９】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で得られた予備焼結プ
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 applying step. In the lubricant applying step 2, a lubricant such as zinc stearate is applied to predetermined portions of the pre-sintered preform obtained in the temporary forming step 1.
【００２０】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焼結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、予備焼結プリフォー
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 pre-sintered 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 pre-sintered preform to 7.4 g / cm3 or more.
【００２１】４は、前記本成形工程３で密度が高められ
た予備焼結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 pre-sintered 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.
【００２２】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 depending on 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.
【００２３】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 a predetermined portion of the cold forging preform as in the case of the normal cold forging. According to this embodiment, since the density of the cold forging preform is increased to 7.4 g / cm3 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 prevents the collapse of the minute voids during forging and makes it difficult to increase the density of the product. To be avoided.
【００２４】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。Accordingly, in the cold forging step 5,
A product having a density of 7.5 g / cm 3 or more can be easily obtained.
【００２５】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.
【００２６】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 /
Products with a high-density composition of cm3 or more can be easily obtained.
【００２７】[0027]
【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.
【００２８】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 の予備焼結プリフォームを成形した。この予備焼結プ
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 の予備焼
結プリフォームが得られた。Metallic powder mixed with 0.2% lubricant was filled in a die and compacted to give a density of 5.5 g / cm.
Three pre-sintered preforms were molded. After applying zinc stearate to this pre-sintered preform, press-molding with a pressure of 8 ton / cm 2 in the die of the main forming step 3 to obtain a pre-sintered preform with a density of 7.45 g / cm 3. Was obtained.
【００２９】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焼結プリフォームを
形成し、この予備焼結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の予備焼結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.
Metal powders of 3%, 0.4%, 0.5% and 0.75% were respectively tentatively compression molded to form various presintered preforms, and the presintered preforms were main compression molded. In this case, the relationship between the molding pressure and the density was obtained as shown in FIG. That is, when 0.6% of the lubricant was mixed and added, a preform having a density of 7.41 g / cm3 was obtained by setting the molding pressure to 10 ton / cm2. In other words, in order to obtain a pre-sintered preform with a molding pressure of 10 ton / cm 2 and a density of 7.4 g / cm 3, it was possible to add 0.6% of lubricant to metal powder. Was given.
【００３０】前記予備焼結プリフォーム、即ち密度が
７．４５ｇ／ｃｍ3 の予備焼結プリフォームを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／ｃｍ3 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／ｃｍ3 の製品が得られた。The presintered preform, that is, the presintered preform having a density of 7.45 g / cm 3
Temporarily sinter in a reducing atmosphere at 900 ° C to form a cold forging sinter preform, apply a lubricant to the cold forging sinter preform, and then apply 7 ton / cm2 in a die.
As a result of pressure molding (cold forging) with a pressure of, a product having a density of 7.62 g / cm3 was obtained. Further, when the molding pressure was increased to 10 ton / cm @ 2, a product having a density of 7.64 g / cm @ 3 was obtained. When the molding pressure was raised to 14 ton / cm @ 2, a product having a density of 7.66 g / cm @ 3 was obtained.
【００３１】[0031]
【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 forming step 2 Lubricant application step 3 Main forming step 4 Temporary sintering step 5 Cold forging step 6 Main sintering step
Claims (3)
焼結プリフォームを形成する仮成形工程と、前記予備焼
結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焼結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
備焼結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 pre-sintered preform by temporarily compression-molding metal powder in a die, and a lubricant application step of applying a lubricant to the pre-sintered preform.
A main forming step of subjecting the pre-sintered preform coated with the lubricant to main compression molding in a die, and a preliminary sintering of the pre-sintered preform subjected to main compression molding to obtain a sintered preform for cold forging A preliminary sintering step, 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 are characterized by being configured. Sinter cold forging method.
が５．０〜６．５ｇ／ｃｍ3 である予備焼結プリフォー
ムを形成する仮成形工程と、前記予備焼結プリフォーム
に潤滑剤を塗布する潤滑剤塗布工程と、前記潤滑剤を塗
布した予備焼結プリフォームをダイス内で本圧縮成形
し、密度を７．４ｇ／ｃｍ3 以上に高める本成形工程
と、前記本圧縮成形した予備焼結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。2. A preliminary forming step of forming a pre-sintered preform having a density of 5.0 to 6.5 g / cm3 by pre-compressing metal powder in a die, and lubricating the pre-sintered preform. Lubricant application step of applying a lubricant, main compression molding of the pre-sintered preform coated with the lubricant in a die to increase the density to 7.4 g / cm3 or more, and the main compression molding A preliminary sintering step of temporarily sintering the presintered preform to obtain a sintered preform for cold forging,
A cold forging step of cold forging the sintered preform,
A sintering cold forging method comprising: a main sintering step of main sintering the sintered preform after the cold forging.
合されてなる請求項１乃至請求項２記載の焼結冷間鍛造
方法。3. The sintering cold forging method according to claim 1, wherein the metal powder is mixed with a lubricant in an amount of 0 to 0.6%.
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 true JPH09287005A (en) | 1997-11-04 |
| JP3499370B2 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 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3499370B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11117002A (en) * | 1997-10-14 | 1999-04-27 | Unisia Jecs Corp | Compact raw material of metallic powder and its production |
| JP2000303106A (en) * | 1999-04-16 | 2000-10-31 | Unisia Jecs Corp | Repressed compact of metallic-powder blank, sintered compact obtained from the repressed compact, and their manufacture |
| JP2000355726A (en) * | 1999-04-16 | 2000-12-26 | Unisia Jecs Corp | Alloy steel powder compacting stock and alloy steel powder worked body |
| JP2002528644A (en) * | 1998-11-02 | 2002-09-03 | ゲーカーエヌ・ジンター・メタルス・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Method for manufacturing sintered member with secondary deformation of green compact |
| JP2004091929A (en) * | 2003-10-06 | 2004-03-25 | Hitachi Unisia Automotive Ltd | Sintering and cold forging method |
| JP2012057249A (en) * | 2010-09-10 | 2012-03-22 | Burgess Norton Manufacturing Co Inc | Fuel injector clamp |
| JP2015176901A (en) * | 2014-03-13 | 2015-10-05 | Ntn株式会社 | Method of producing powder magnetic core |
| JP2018502720A (en) * | 2014-11-21 | 2018-02-01 | メタルダイン，エルエルシー | Pre-sintered brazing |
-
1996
- 1996-04-22 JP JP12279996A patent/JP3499370B2/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11117002A (en) * | 1997-10-14 | 1999-04-27 | Unisia Jecs Corp | Compact raw material of metallic powder and its production |
| JP2002528644A (en) * | 1998-11-02 | 2002-09-03 | ゲーカーエヌ・ジンター・メタルス・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Method for manufacturing sintered member with secondary deformation of green compact |
| JP2000303106A (en) * | 1999-04-16 | 2000-10-31 | Unisia Jecs Corp | Repressed compact of metallic-powder blank, sintered compact obtained from the repressed compact, and their manufacture |
| JP2000355726A (en) * | 1999-04-16 | 2000-12-26 | Unisia Jecs Corp | Alloy steel powder compacting stock and alloy steel powder worked body |
| JP2004091929A (en) * | 2003-10-06 | 2004-03-25 | Hitachi Unisia Automotive Ltd | Sintering and cold forging method |
| JP2012057249A (en) * | 2010-09-10 | 2012-03-22 | Burgess Norton Manufacturing Co Inc | Fuel injector clamp |
| CN102398033A (en) * | 2010-09-10 | 2012-04-04 | 伯吉斯-诺顿制造有限公司 | Fuel injector clamp |
| CN102398033B (en) * | 2010-09-10 | 2014-09-17 | 伯吉斯-诺顿制造有限公司 | Fuel injector clamp |
| JP2015176901A (en) * | 2014-03-13 | 2015-10-05 | Ntn株式会社 | Method of producing powder magnetic core |
| JP2018502720A (en) * | 2014-11-21 | 2018-02-01 | メタルダイン，エルエルシー | Pre-sintered brazing |
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