JPH05209220A - Production of parts made of steel - Google Patents

Production of parts made of steel

Info

Publication number
JPH05209220A
JPH05209220A JP1417692A JP1417692A JPH05209220A JP H05209220 A JPH05209220 A JP H05209220A JP 1417692 A JP1417692 A JP 1417692A JP 1417692 A JP1417692 A JP 1417692A JP H05209220 A JPH05209220 A JP H05209220A
Authority
JP
Japan
Prior art keywords
steel
forging
less
hot forging
preformed
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
Application number
JP1417692A
Other languages
Japanese (ja)
Inventor
Mamoru Yamada
田 守 山
Original Assignee
Daido Steel Co Ltd
大同特殊鋼株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daido Steel Co Ltd, 大同特殊鋼株式会社 filed Critical Daido Steel Co Ltd
Priority to JP1417692A priority Critical patent/JPH05209220A/en
Publication of JPH05209220A publication Critical patent/JPH05209220A/en
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To produce high quality parts made of steel without intermediate and temper heat treatments by applying high velocity hot forging to a nonheat- treated steel stock, finishing the above forging at the prescribed temp., and then forming the resulting preformed body into the prescribed shape by means of warm forging at low draft. CONSTITUTION:High velocity hot forging is applied to a nonheat-treated steel stock to form it into a preformed body having a shape near to the prescribed shape. It is preferable that this steel stock has a composition containing, by weight, 0.3-0.6% C, 0.1-2.0% Si, 0.2-2.5% Mn, 0.005-0.1% Al, 0.005-0.3% N, and <=0.5% V and/or Nb as essential components, also containing Cr, Ni, Mo, W, S, Pb, Bi, Te, etc., as optional additive components, and having the balance Fe with impurities. Further, the above hot forging is done at 1100-1250 deg.C and finished at the finishing temp. where the initial crystal grain size becomes increased. By the above procedure the hardness of the preformed body can be regulated to HRC 20 to 28, and warm forging is applied to the preformed body at 600-700 deg.C at low draft to form it into the prescribed shape. By this method, the parts made of steel free from strain can be obtained while obviating the necessity of notmalizing, quench-and-temper, etc.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は、鋼製部品の品質向上な
らびに製造工程の簡略化に関し、例えば、自動車,家庭
用電気機器,事務用機器,産業用工作機械部品,農業機
械部品,繊維機械部品等々において用いられる各種鋼製
部品を製造するのに利用される鋼製部品の製造方法に関
するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the quality of steel parts and simplifying the manufacturing process. For example, automobiles, household electric appliances, office equipment, industrial machine tool parts, agricultural machine parts, textile machines. The present invention relates to a method of manufacturing a steel part used for manufacturing various steel parts used in parts and the like.
【0002】[0002]
【従来の技術】近年、各種鋼製部品の製造にあたって
は、製品コストの低減をねらって、加工手段を切削加工
から冷間ないしは温間鍛造加工(いわゆる冷間ないしは
温間における塑性加工全般を含む。)に変更する場合が
多くなっている。
2. Description of the Related Art In recent years, in manufacturing various steel parts, in order to reduce the product cost, the working means is from cutting to cold or warm forging (including general plastic working in so-called cold or warm. .) Is often changed.
【0003】このような冷間ないしは温間鍛造を行う場
合における鋼素材の鍛造性は、材料の変形抵抗,変形
能,工具の耐靭性,耐摩耗性,潤滑剤等に大きく影響さ
れるため、これらの技術が総合的に進歩しないと、従来
の主たる加工手段である切削加工に対して全面的にとっ
て代わることは困難である。
The forgeability of the steel material in such cold or warm forging is greatly influenced by the deformation resistance of the material, the deformability, the toughness of the tool, the wear resistance, the lubricant, etc. Without comprehensive progress in these technologies, it is difficult to completely replace the conventional main machining means, cutting.
【0004】しかしながら、近年においてはこれらの技
術が急速に進歩してきており、多くの部品で冷間ないし
は温間鍛造が採用されるようになってきた。
However, in recent years, these techniques have been rapidly advanced, and cold or warm forging has been adopted for many parts.
【0005】冷間ないしは温間鍛造は、生産性,材料歩
留りなどの面において切削加工よりも優れた加工法であ
り、最も技術的に困難であった加工精度の点でも精密切
削部品に近くなっていることから、用途は急激に拡大し
ている。
Cold or warm forging is a processing method superior to cutting in terms of productivity, material yield, etc., and is close to precision cutting parts in terms of processing accuracy, which was the most technically difficult. Therefore, the applications are expanding rapidly.
【0006】一般に、鋼製部品を冷間ないしは温間鍛造
によって製造するに際しては、線材,棒材等の鋼素材に
対して酸洗等の前処理を行ったのち被膜・潤滑等の予備
処理を行って表面状態を調整し、製品重量に近い状態に
切断したのち、数工程の冷間ないしは温間鍛造を行うよ
うにしていた。
In general, when manufacturing steel parts by cold or warm forging, a steel material such as a wire rod or a bar material is subjected to a pretreatment such as pickling and then a pretreatment such as coating and lubrication. After that, the surface condition was adjusted, and the product was cut into a state close to the product weight, and then cold or warm forging of several steps was performed.
【0007】[0007]
【発明が解決しようとする課題】しかしながら、一部の
冷間ないしは温間鍛造品において、冷間ないしは温間鍛
造時に蓄積される加工歪等に起因して結晶粒が異常に粗
大化することがあり、これが不均一な歪の発生を招くこ
とがあって、ときには割れ発生の原因となることがあっ
たり、焼準を施す必要があったりするという問題点があ
り、上記したような不均一な歪の発生による品質の低下
や焼準を施す必要があることによる生産性の低下を軽減
することが課題となっていた。
However, in some of the cold or warm forged products, the crystal grains may be abnormally coarsened due to the working strain accumulated during the cold or warm forging. However, this may lead to uneven strain, which sometimes causes cracking or requires normalization. It has been an issue to reduce the deterioration of quality due to the occurrence of strain and the decrease of productivity due to the necessity of normalizing.
【0008】[0008]
【発明の目的】本発明は、上記したような従来の課題に
かんがみてなされたものであって、焼準などの中間の熱
処理を必らずしも必要とせず、また、焼入れ焼もどしな
どの熱処理をも必要とせず、不均一な歪の発生がなくな
って、鋼製部品の品質向上ならびに製造工程の簡略化を
はかることが可能である鋼製部品の製造方法を提供する
ことを目的としている。
SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned conventional problems, and does not necessarily require an intermediate heat treatment such as normalizing, and does not require quenching and tempering. It is an object of the present invention to provide a method for manufacturing a steel part that does not require heat treatment, eliminates the occurrence of uneven strain, and can improve the quality of steel parts and simplify the manufacturing process. ..
【0009】[0009]
【課題を解決するための手段】本発明に係わる鋼製部品
の製造方法は、非調質鋼素材に高速熱間鍛造(熱間にお
ける塑性加工を意味し、ここでは代表して「鍛造」とす
る。)を加えて初期結晶粒径が大きくなる熱間鍛造終止
温度で鍛造を終了して鋼製部品の所定形状に近い形状の
予備成形体に成形し、その後加工度を低くした温間鍛造
(温間における塑性加工を意味し、ここでは代表して
「鍛造」とする。)を加えることにより所定形状に成形
する構成としたことを特徴としており、必要に応じて採
用される実施態様においては、非調質鋼素材が、重量%
で、C:0.3〜0.6%、Si:0.1〜2.0%、
Mn:0.2〜2.5%、Al:0.005〜0.1
%、N:0.005〜0.3%、およびV:0.5%以
下,Nb:0.5%以下のうちの1種または2種を基本
成分とし、任意添加成分が、Cr:5.0%以下,N
i:5.0%以下,Mo:3.0%以下,W:3.0%
以下のうちの1種または2種以上、S:0.03〜0.
15%,Pb:0.05〜0.30%,Bi:0.00
5〜0.10%,Te:0.005〜0.10%、より
選択され、残部Feおよび不純物からなるものとするこ
とができ、必要に応じて採用される実施態様において
は、熱間鍛造温度を1100〜1250℃とする構成と
し、同じく必要に応じて採用される実施態様において
は、熱間鍛造後の硬さをHC20〜28とする構成と
し、同じく必要に応じて採用される実施態様において
は、温間鍛造温度を600〜700℃とする構成とした
ことを特徴としており、上記した鋼製部品の製造方法に
係わる発明の構成をもって前述した従来の課題を解決す
るための手段としている。
A method of manufacturing a steel part according to the present invention is a high-speed hot forging of a non-heat treated steel material (meaning hot plastic working, which is representatively referred to as "forging"). ) Is added to finish the forging at the final temperature of the hot forging to increase the initial grain size and form a preformed body with a shape close to the prescribed shape of the steel part, and then warm forging with a low degree of workability. (Means plastic working in a warm state, and is representatively referred to as “forging” here). It is characterized in that it is formed into a predetermined shape by adding, and in an embodiment adopted as necessary. Is a non-heat treated steel material, wt%
And C: 0.3 to 0.6%, Si: 0.1 to 2.0%,
Mn: 0.2-2.5%, Al: 0.005-0.1
%, N: 0.005 to 0.3%, V: 0.5% or less, Nb: 0.5% or less as a basic component, and an optional additive component is Cr: 5 0.0% or less, N
i: 5.0% or less, Mo: 3.0% or less, W: 3.0%
One or more of the following, S: 0.03 to 0.
15%, Pb: 0.05 to 0.30%, Bi: 0.00
5 to 0.10%, Te: 0.005 to 0.10%, which may consist of the balance Fe and impurities, and is hot forged in an embodiment adopted as necessary. In the embodiment in which the temperature is set to 1100 to 1250 ° C. and also adopted as necessary, the hardness after hot forging is set to H R C20 to 28, and is also adopted as necessary. The embodiment is characterized in that the warm forging temperature is set to 600 to 700 ° C., and means for solving the above-mentioned conventional problems with the configuration of the invention related to the method for manufacturing a steel component described above. I am trying.
【0010】本発明に係わる鋼製部品の製造方法におい
ては、重量%で、C:0.3〜0.6%、Si:0.1
〜2.0%、Mn:0.2〜2.5%、Al:0.00
5〜0.1%、N:0.005〜0.3%、およびV:
0.5%以下,Nb:0.5%以下のうちの1種または
2種を基本成分とし、任意添加成分が、Cr:5.0%
以下,Ni:5.0%以下,Mo:3.0%以下,W:
3.0%以下のうちの1種または2種以上、S:0.0
3〜0.15%,Pb:0.05〜0.30%,Bi:
0.005〜0.10%,Te:0.005〜0.10
%、より選択され、残部Feおよび不純物からなる非調
質鋼素材を用いることができる。
In the method for manufacturing a steel part according to the present invention, C: 0.3 to 0.6% and Si: 0.1 are% by weight.
~ 2.0%, Mn: 0.2-2.5%, Al: 0.00
5 to 0.1%, N: 0.005 to 0.3%, and V:
One or two of 0.5% or less and Nb: 0.5% or less is a basic component, and an optional additive component is Cr: 5.0%.
Below, Ni: 5.0% or less, Mo: 3.0% or less, W:
One or more of 3.0% or less, S: 0.0
3 to 0.15%, Pb: 0.05 to 0.30%, Bi:
0.005-0.10%, Te: 0.005-0.10
%, A non-heat treated steel material composed of the balance Fe and impurities can be used.
【0011】この場合、Cは強度確保のための基本成分
であるので0.3%以上とすることが望ましいが、多す
ぎると延性および靭性が低下するため0.6%以下とす
ることが望ましく、Siは脱酸元素として有効であるの
で0.1%以上とすることが望ましいが、多すぎると鍛
造性を低下させるので2.0%以下とすることが望まし
く、Mnは脱酸,脱硫元素として有効であると共に強度
を向上するのに有効であるので0.2%以上とすること
が望ましいが、多すぎると加工性が低下するので2.5
%以下とすることが望ましく、Alは脱酸および粒度調
整のために0.005%以上とするのが望ましいが、多
すぎると加工性を低下させるため0.1%以下とするこ
とが望ましく、Nは窒化物を形成して部品の強靭性を向
上させるので0.005%以上とすることが望ましい
が、多すぎると加工性が低下するため0.3%以下とす
ることが望ましく、V,Nbは炭窒化物を形成すること
によって部品の強靭性を向上させるが、多すぎると鍛造
の際の変形抵抗を増大させるのでいずれも0.5%以下
とすることが望ましく、Cr,Ni,Mo,Wは非調質
部品の強度および靭性を向上させるが、多すぎると加工
性を低下させるのでそれぞれ5.0%以下,5.0%以
下,3.0%以下,3.0%以下とすることが望まし
く、S,Pb,Bi,Teは被削性の向上に有効な元素
であって仕上げ加工において切削加工を行う場合に有利
なこともあるので上記の範囲で添加することも良い。
In this case, C is a basic component for securing the strength, so it is desirable to set it to 0.3% or more, but if it is too much, the ductility and toughness decrease, so it is desirable to make it 0.6% or less. , Si is effective as a deoxidizing element, so it is desirable to set it to 0.1% or more, but it is desirable to set it to 2.0% or less because if it is too much, the forgeability is lowered, and Mn is a deoxidizing and desulfurizing element. It is preferable that the content be 0.2% or more because it is effective as the above and is also effective for improving the strength.
% Or less, Al is preferably 0.005% or more for deoxidation and particle size adjustment, but if it is too much, it lowers the workability, so 0.1% or less is desirable, N is preferable to be 0.005% or more because it forms a nitride to improve the toughness of the component, but if it is too much, the workability decreases, so it is preferable to make it 0.3% or less. Nb improves the toughness of parts by forming carbonitrides, but if it is too much, it increases the deformation resistance during forging, so it is desirable to make it 0.5% or less for all of Cr, Ni, Mo. , W improves the strength and toughness of non-heat treated parts, but if they are too much, they lower the workability. It is desirable that S, Pb, Bi, e it may be added in the above range so advantageously also when performing the cutting in finishing a effective element in improving the machinability.
【0012】次いで、前記非調質鋼素材に高速熱間鍛造
を加えて初期結晶粒径が大きくなる熱間鍛造終止温度で
鍛造を終了することにより鋼製部品の所定形状に近い形
状の予備成形体に成形する。
Next, high-speed hot forging is applied to the non-heat treated steel material to complete the forging at the hot forging end temperature at which the initial crystal grain size increases, thereby preforming a shape close to the predetermined shape of the steel part. Shape into the body.
【0013】このとき、鋼素材に対して高速熱間鍛造を
加えるようにしたのは、高速熱間鍛造によって熱間鍛造
終止温度を高くすることができるようにするためであ
り、熱間鍛造終止温度を高く管理することによって予備
成形体の初期結晶粒径が大きくなるようにするためであ
る。
At this time, the reason why the high speed hot forging is applied to the steel material is that the hot forging end temperature can be raised by the high speed hot forging. This is because the initial crystal grain size of the preform is increased by controlling the temperature high.
【0014】そして、予備成形体の初期結晶粒径が大き
なものとなるようにするためには、熱間鍛造終止温度を
900℃以上にすることが望ましく、このような観点な
らびに操業上等の観点からは、熱間鍛造温度を1100
〜1250℃の範囲とすることがより望ましい。
In order to make the initial crystal grain size of the preformed body large, it is desirable to set the hot forging final temperature to 900 ° C. or higher. From this point of view and from the viewpoint of operation, etc. From the hot forging temperature 1100
It is more desirable to set the temperature in the range of ˜1250 ° C.
【0015】また、予備成形体は鋼製部品の所定形状に
近い形状となるようにしているのは、この後の温間鍛造
における加工度が小さくなるようにするためである。
Further, the preform is made to have a shape close to the predetermined shape of the steel part in order to reduce the workability in the subsequent warm forging.
【0016】そして、上記した熱間鍛造後においては予
備成形体の硬さがHC20〜28であるようにするこ
とが望ましく、予備成形体の硬さが低いと十分な強度を
得がたくなり、反対に予備成形体の硬さが高いと温間鍛
造性が低下することとなる。
[0016] Then, it is desirable that the hardness of the preform to be the H R C20~28 is after hot forging as described above, a sufficient strength is low hardness of the preform difficult to obtain On the contrary, if the hardness of the preform is high, the warm forgeability is deteriorated.
【0017】この熱間鍛造後には、前記予備成形体に対
して加工度を低くした温間鍛造を加えることによって所
定形状に成形するが、この際の温間鍛造温度は温間鍛造
性や結晶粒度粗大化防止等の観点から600〜700℃
の範囲とすることがより望ましい。
After the hot forging, the preformed body is formed into a predetermined shape by applying a warm forging with a low workability. The warm forging temperature at this time is the warm forgeability and the crystallinity. From the viewpoint of preventing particle coarsening, etc., 600-700 ℃
It is more desirable to set the range to.
【0018】図1,図2,図3は各種形状の鋼製部品に
おける加工度の算出要領を示すものであって、図1の
(a)に示す予備成形体1aから単純な圧縮加工ないし
はこれに近似する加工によって図1の(b)に示す鋼製
部品1bを得る場合の加工度Fは、 (ただし、hは加工前の高さ,Sは加工前の断面
積,hは加工後の高さ,Sは加工後の断面積)で表
わされ、図2の(a)に示す予備成形体2aから押し込
み加工ないしはこれに近似する加工によって図2の
(b)に示す鋼製部品2bを得る場合の加工度Fは、 (ただし、Sは加工前の断面積,Sは加工後の開口
部断面積)で表わされ、図3の(a)に示す予備成形体
3aから据え込み加工ないしはこれに近似する加工によ
って図3の(b)に示す鋼製部品3bを得る場合の加工
度Fは、 (ただし、Sは加工前の断面積,Sは加工後の加工
部断面積)で表わされる。
FIGS. 1, 2 and 3 show the procedure for calculating the degree of processing in steel parts of various shapes, which is a simple compression process or a simple compression process from the preform 1a shown in FIG. 1 (a). The workability F when obtaining the steel part 1b shown in FIG. (Where, h 0 is the height before processing, S 0 is the cross-sectional area before processing, h 1 is the height after processing, S 1 is the cross-sectional area after processing), and FIG. The workability F in the case of obtaining the steel part 2b shown in FIG. 2B from the preform 2a shown in FIG. (However, S 0 is the cross-sectional area before processing and S 2 is the cross-sectional area of the opening after processing). Upsetting or similar processing from the preform 3a shown in FIG. The workability F when obtaining the steel part 3b shown in FIG. (However, S 0 is the cross-sectional area before processing and S 3 is the cross-sectional area of the processed portion after processing).
【0019】そして、このような加工度で例示される温
間鍛造においては、上記加工度Fが10%以下となるよ
うにすることがとくに望ましい。
In the warm forging, which is exemplified by such a workability, it is particularly desirable that the workability F be 10% or less.
【0020】したがって、温間鍛造によって所定形状ま
での成形が可能であることから、1工程仕上げも可能と
なり、焼準などの中間の熱処理を不要とすることもでき
る。
Therefore, since it is possible to form a predetermined shape by warm forging, one-step finishing is possible, and intermediate heat treatment such as normalizing can be eliminated.
【0021】このようにして、温間鍛造により所定形状
まで成形することによって、焼入れ,焼もどしなどの熱
処理を施すことなく非調質で品質の優れた鋼製部品を得
る。この場合、適宜の仕上げ加工を施しても良いことは
もちろんである。
In this way, by forming into a predetermined shape by warm forging, it is possible to obtain a non-heat treated and high-quality steel part without performing heat treatment such as quenching and tempering. In this case, it goes without saying that appropriate finishing may be performed.
【0022】[0022]
【発明の作用】本発明に係わる鋼製部品の製造方法は、
前述した構成を有するものであり、非調質鋼素材に高速
熱間鍛造を加えて得た予備成形体の初期結晶粒径が大き
くなっていると共に、予備成形体は所定形状に近い形状
を有するものとなっているので、その後の温間鍛造の際
の加工度は小さなものとなり、また、焼準などの中間の
熱処理は必ずしも必要としないものになると共に、焼入
れや焼もどしなどの熱処理を施さなくても機械的性質に
優れた鋼製部品が得られることとなり、熱処理による結
晶粒の粗大化が伴なわないものとなって、鋼製部品の疲
労,圧縮,引張等の強度や形状精度等がより一層向上し
たものとなる。
The method of manufacturing a steel part according to the present invention comprises:
With the above-described structure, the preform obtained by adding high-speed hot forging to a non-heat treated steel material has a large initial crystal grain size, and the preform has a shape close to a predetermined shape. Therefore, the degree of working during the subsequent warm forging is small, and intermediate heat treatment such as normalizing is not always necessary, and heat treatment such as quenching and tempering is performed. Even without them, steel parts with excellent mechanical properties can be obtained, which does not cause coarsening of crystal grains due to heat treatment, and the strength and shape accuracy of steel parts such as fatigue, compression, and tension. Is further improved.
【0023】[0023]
【実施例】表1に示す化学成分よりなる非調質鋼素材
(圧延まま)を用い、高速熱間鍛造機に組み込まれた誘
導加熱装置によって図4の温度T=1180℃に加熱
し、次いで、高速熱間鍛造を行ったのち冷却速度を2.
6℃/secに調整しながら冷却して予備成形体を得
た。
[Example] Using a non-heat treated steel material (as-rolled) consisting of the chemical components shown in Table 1, heated to a temperature T 1 = 1180 ° C. in FIG. 4 by an induction heating device incorporated in a high-speed hot forging machine, Then, after performing high-speed hot forging, the cooling rate was set to 2.
It cooled, adjusting at 6 degree-C / sec, and obtained the preform.
【0024】この予備成形体は鋼製部品(この実施例で
はフランジコンパニオン)の仕上げ形状に近い形状をな
すものであり、後に行う温間鍛造の際の加工度が5%と
なるように設定した。
This preform has a shape close to the finished shape of the steel part (flange companion in this embodiment), and was set so that the workability in the later warm forging was 5%. ..
【0025】また、予備成形体の硬さはHC20〜2
8の範囲内にあるものとなっていた。
Further, the hardness of the preform H R C20~2
It was within the range of 8.
【0026】次いで、前記予備成形体に対して熱間鍛造
時のスケールを除去するためのショットブラストを実施
した後、図4の温度T=620℃,650℃,680
℃の3種類の温度で温間鍛造を行った。
Next, shot blasting for removing the scale during hot forging is performed on the preformed body, and then the temperature T 2 of FIG. 4 is 620 ° C., 650 ° C., 680 ° C.
Warm forging was performed at three different temperatures of ° C.
【0027】このようにして得たフランジコンパニオン
の特性を調べたところ、表2に示す結果であった。
When the characteristics of the flange companion thus obtained were examined, the results shown in Table 2 were obtained.
【0028】[0028]
【表1】 [Table 1]
【0029】[0029]
【表2】 [Table 2]
【0030】表2に示すように、温間鍛造温度T=6
20℃,650℃,680℃のいずれにおいても結晶粒
度番号が10以上の微細なものとなっていて優れた靭性
を示すとともに、中間の熱処理として焼準を省略するこ
とが可能であって焼入れ焼もどしの熱処理をも必要とす
ることなく非調質で特性の優れた鋼製部品を製造するこ
とができるという良好なる結果を得ることができた。
As shown in Table 2, the warm forging temperature T 2 = 6
At any of 20 ° C., 650 ° C. and 680 ° C., the grain size number is finer than 10 and shows excellent toughness, and it is possible to omit normalizing as an intermediate heat treatment It was possible to obtain a good result that a steel part having a non-heat treated property and excellent characteristics could be manufactured without requiring a heat treatment for tempering.
【0031】[0031]
【発明の効果】本発明に係わる鋼製部品の製造方法によ
れば、非調質鋼素材に高速熱間鍛造を加えて得た予備成
形体の初期結晶粒径が大きなものとなっていると共に、
予備成形体は鋼製部品の所定形状に近い形状のものとな
っているので、その後の温間鍛造の際の加工度は小さな
ものとなり、焼準などの中間の熱処理を必ずしも必要と
せず、また、焼入れ焼もどしなどの熱処理を施すことな
く非調質で優れた機械的特性の鋼製部品を製造すること
が可能であって、鋼製部品の疲労,圧縮,引張等の強度
をより一層向上したものとすることが可能になり、鋼製
部品の品質向上ならびに製造工程の簡略化を実現するこ
とが可能になるという著しく優れた効果がもたらされ
る。
EFFECTS OF THE INVENTION According to the method for manufacturing a steel part according to the present invention, the initial crystal grain size of the preform obtained by adding high speed hot forging to a non-heat treated steel material is large and ,
Since the preformed body has a shape close to the predetermined shape of the steel part, the degree of workability during the subsequent warm forging is small, and intermediate heat treatment such as normalizing is not necessarily required, and It is possible to manufacture non-heat treated steel parts with excellent mechanical properties without performing heat treatment such as quenching and tempering, and further improve the strength of steel parts such as fatigue, compression and tension. It is possible to improve the quality of steel parts and simplify the manufacturing process.
【図面の簡単な説明】[Brief description of drawings]
【図1】加工度の算出要領の一例を示す説明図である。FIG. 1 is an explanatory diagram showing an example of a procedure for calculating a processing degree.
【図2】加工度の算出要領の他の例を示す説明図であ
る。
FIG. 2 is an explanatory diagram showing another example of a procedure for calculating a processing degree.
【図3】加工度の算出要領のさらに他の例を示す説明図
である。
FIG. 3 is an explanatory diagram showing still another example of a procedure for calculating a working ratio.
【図4】本発明の実施例で採用した熱間鍛造−温間鍛造
の際の温度変化を示す説明図である。
FIG. 4 is an explanatory diagram showing a temperature change during hot forging-warm forging adopted in an example of the present invention.
【符号の説明】[Explanation of symbols]
1a,2a,3a 予備成形体 1b,2b,3b 鋼製部品 1a, 2a, 3a Preforms 1b, 2b, 3b Steel parts
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 C22C 38/12 38/60 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C22C 38/12 38/60

Claims (6)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 非調質鋼素材に高速熱間鍛造を加えて初
    期結晶粒径が大きくなる熱間鍛造終止温度で鍛造を終了
    して鋼製部品の所定形状に近い形状の予備成形体に成形
    し、その後加工度を低くした温間鍛造を加えることによ
    り所定形状に成形することを特徴とする鋼製部品の製造
    方法。
    1. A preform having a shape close to a predetermined shape of a steel part is obtained by applying high-speed hot forging to a non-heat treated steel material to finish forging at the hot forging end temperature at which the initial grain size increases. A method for manufacturing a steel part, which comprises forming and then forming into a predetermined shape by applying warm forging with a reduced workability.
  2. 【請求項2】 非調質鋼素材が、重量%で、C:0.3
    〜0.6%、Si:0.1〜2.0%、Mn:0.2〜
    2.5%、Al:0.005〜0.1%、N:0.00
    5〜0.3%、およびV:0.5%以下,Nb:0.5
    %以下のうちの1種または2種を基本成分とし、残部F
    eおよび不純物よりなる請求項1に記載の鋼製部品の製
    造方法。
    2. A non-heat treated steel material, in% by weight, C: 0.3.
    ~ 0.6%, Si: 0.1-2.0%, Mn: 0.2-
    2.5%, Al: 0.005-0.1%, N: 0.00
    5 to 0.3%, V: 0.5% or less, Nb: 0.5
    % Or less as a basic component, and the balance F
    The method for manufacturing a steel part according to claim 1, which comprises e and impurities.
  3. 【請求項3】 非調質鋼素材の任意添加成分が、Cr:
    5.0%以下,Ni:5.0%以下,Mo:3.0%以
    下,W:3.0%以下のうちの1種または2種以上、
    S:0.03〜0.15%,Pb:0.05〜0.30
    %,Bi:0.005〜0.10%,Te:0.005
    〜0.10%、より選択される請求項2に記載の鋼製部
    品の製造方法。
    3. The optional additive component of the non-heat treated steel material is Cr:
    5.0% or less, Ni: 5.0% or less, Mo: 3.0% or less, W: 3.0% or less, one or more,
    S: 0.03 to 0.15%, Pb: 0.05 to 0.30
    %, Bi: 0.005 to 0.10%, Te: 0.005
    The manufacturing method of the steel component according to claim 2 selected from 0.10%.
  4. 【請求項4】 熱間鍛造温度を1100〜1250℃と
    する請求項1ないし3のいずれかに記載の鋼製部品の製
    造方法。
    4. The method for manufacturing a steel part according to claim 1, wherein the hot forging temperature is 1100 to 1250 ° C.
  5. 【請求項5】 熱間鍛造後の予備成形体の硬さをH
    20〜28とする請求項1ないし4のいずれかに記載の
    鋼製部品の製造方法。
    5. A hardness of the preform after hot forging H R C
    The method for manufacturing a steel part according to any one of claims 1 to 4, wherein the steel part has a size of 20 to 28.
  6. 【請求項6】 温間鍛造温度を600〜700℃とする
    請求項1ないし5のいずれかに記載の鋼製部品の製造方
    法。
    6. The method for producing a steel part according to claim 1, wherein the warm forging temperature is 600 to 700 ° C.
JP1417692A 1992-01-29 1992-01-29 Production of parts made of steel Granted JPH05209220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1417692A JPH05209220A (en) 1992-01-29 1992-01-29 Production of parts made of steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1417692A JPH05209220A (en) 1992-01-29 1992-01-29 Production of parts made of steel

Publications (1)

Publication Number Publication Date
JPH05209220A true JPH05209220A (en) 1993-08-20

Family

ID=11853838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1417692A Granted JPH05209220A (en) 1992-01-29 1992-01-29 Production of parts made of steel

Country Status (1)

Country Link
JP (1) JPH05209220A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1783234A2 (en) 2002-09-26 2007-05-09 ThyssenKrupp Steel AG Method for manufacturing products by plastic deformation at high temperatures
WO2014148456A1 (en) * 2013-03-20 2014-09-25 愛知製鋼株式会社 Forged part, method for producing same, and connecting rod
JP2015190036A (en) * 2014-03-28 2015-11-02 日新製鋼株式会社 Steel sheet for fiber machine component and manufacturing method therefor
CN110541108A (en) * 2019-07-26 2019-12-06 马鞍山钢铁股份有限公司 nb and V composite 700MPa grade high-strength anti-seismic steel bar steel and production method thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1783234A2 (en) 2002-09-26 2007-05-09 ThyssenKrupp Steel AG Method for manufacturing products by plastic deformation at high temperatures
EP1783234A3 (en) * 2002-09-26 2007-08-08 ThyssenKrupp Steel AG Method for manufacturing products by plastic deformation at high temperatures
WO2014148456A1 (en) * 2013-03-20 2014-09-25 愛知製鋼株式会社 Forged part, method for producing same, and connecting rod
JP5681333B1 (en) * 2013-03-20 2015-03-04 愛知製鋼株式会社 Forged parts, manufacturing method thereof, and connecting rod
RU2622472C2 (en) * 2013-03-20 2017-06-15 Тойота Дзидося Кабусики Кайся Wrought component, method for the production thereof and connecting rod
US10822677B2 (en) 2013-03-20 2020-11-03 Aichi Steel Corporation Forged component, method for manufacturing the same, and connecting rod
JP2015190036A (en) * 2014-03-28 2015-11-02 日新製鋼株式会社 Steel sheet for fiber machine component and manufacturing method therefor
CN110541108A (en) * 2019-07-26 2019-12-06 马鞍山钢铁股份有限公司 nb and V composite 700MPa grade high-strength anti-seismic steel bar steel and production method thereof

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