JP2003266140A - Hot upsetting method - Google Patents
Hot upsetting methodInfo
- Publication number
- JP2003266140A JP2003266140A JP2002072431A JP2002072431A JP2003266140A JP 2003266140 A JP2003266140 A JP 2003266140A JP 2002072431 A JP2002072431 A JP 2002072431A JP 2002072431 A JP2002072431 A JP 2002072431A JP 2003266140 A JP2003266140 A JP 2003266140A
- Authority
- JP
- Japan
- Prior art keywords
- forging
- upset forging
- hot
- chamfering
- mold
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/04—Shaping in the rough solely by forging or pressing
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は熱間据込鍛造方法に
関し、更に詳しくは、大型サイズの被加工材の熱間据込
鍛造時における粗粒発生を解消することができる熱間据
込鍛造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot upset forging method, and more particularly to a hot upset forging capable of eliminating generation of coarse grains during hot upset forging of a large-sized workpiece. Regarding the method.
【０００２】[0002]
【従来の技術】従来から、例えば航空機エンジン用のガ
スタービンディスクは、Ｃｒ含有量が５％以上のオース
テナイト系鋼種の素材を熱間据込鍛造して製造されてい
る。その１例を図４に基づいて説明する。型面が平坦面
になっている下型１Ａの中央位置に、所定温度に加熱さ
れた例えば円柱状の被加工材（直径Ｄ0，高さｈ0，）２
を配置し、型面が平坦面になっていて、直径が下型１Ａ
と略同じである上型１Ｂを用いて、前記被加工材２を据
え込む。その結果、被加工材２は塑性変形して図の仮想
線で示したように、直径Ｄ 1（Ｄ0＜Ｄ1），高さｈ1（ｈ
1＜ｈ0）の鍛造材２’になる。2. Description of the Related Art Conventionally, for example, a gas for an aircraft engine is used.
Austenite disk with a Cr content of 5% or more
Manufactured by hot upset forging of tenite type steel material
It One example thereof will be described with reference to FIG. Mold surface is flat
At the center position of the lower mold 1A,
For example, a cylindrical workpiece (diameter D0， Height h0,) 2
, The mold surface is flat, and the diameter is lower mold 1A.
Install the work piece 2 using the upper mold 1B that is substantially the same as
Get in. As a result, the workpiece 2 is plastically deformed and
As indicated by the line, the diameter D 1(D0<D1), Height h1(H
1<H0) Forged material 2 '.
【０００３】なお、このときの被加工材に対する鍛造温
度（据込温度）や鍛錬比（（ｈ0−ｈ1）×１００／
ｈ0：％表示）は、用いる鋼種によって適切に選定され
る。このような据込鍛造で製造された鍛造材２’に対し
ては、その靭性確保と強度確保の観点から、結晶粒度が
ＡＳＴＭで＃３以下と微細になっていることが要求され
る。At this time, the forging temperature (upsetting temperature) and the forging ratio ((h 0 -h 1 ) × 100 /
h 0 :% display) is appropriately selected depending on the steel type used. The forged material 2 ′ manufactured by such upset forging is required to have a fine crystal grain size of ASTM # 3 or less from the viewpoint of ensuring the toughness and the strength.
【０００４】しかしながら、高濃度のＣｒやＮｉを含有
するマルテンサイト系およびオーステナイト系の耐熱鋼
から成る大型サイズの被加工材に上記した据込鍛造を行
うと、次のような態様で、粗粒が組織内に局所的に発生
して、組織に関する上記した要求が満たされないことが
ある。すなわち、図５で示したように、得られた鍛造材
２’の上・下の表層部に、円環状に粒径が２〜３mm程度
の巨大な粗粒３が発生し、その場合の円環の直径は、用
いた被加工材の直径（Ｄ0）と略等しくなっている。However, when the above-mentioned upset forging is performed on a large-sized work material made of a heat-resistant martensitic and austenitic steel containing a high concentration of Cr or Ni, coarse grains are obtained in the following manner. May occur locally in the tissue, and the above-mentioned requirements regarding the tissue may not be satisfied. That is, as shown in FIG. 5, in the upper and lower surface layers of the obtained forged material 2 ', huge coarse particles 3 having a particle diameter of about 2 to 3 mm are formed in an annular shape, and the circle in that case is generated. The diameter of the ring is approximately equal to the diameter (D 0 ) of the used work material.
【０００５】[0005]
【発明が解決しようとする課題】本発明は大型サイズの
被加工材に対する熱間据込鍛造を行ったときの上記した
粗粒発生を解決することができる熱間据込鍛造方法の提
供を目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot upsetting forging method capable of solving the above-mentioned generation of coarse grains when hot upsetting forging a large-sized work material. And
【０００６】[0006]
【課題を解決するための手段】本発明者らは、上記した
粗粒発生を解消するために鋭意研究を重ねる過程で、粗
粒発生の現象に関して以下のように整理し、発生原因に
関する考察を加えた。
（１）まず、据込鍛造で得られた鍛造材における粗粒発
生の位置は、鍛造材の表層部付近である。それは、用い
た被加工材の直径と略同じ直径の円環状に発生する。[Means for Solving the Problems] In the process of earnestly researching in order to eliminate the above-described generation of coarse particles, the present inventors arranged the phenomenon of coarse particle generation as follows and considered the cause of the generation. added. (1) First, the position of coarse grain generation in the forged material obtained by upsetting is near the surface layer of the forged material. It occurs in an annular shape having a diameter substantially the same as the diameter of the work material used.
【０００７】（２）据込鍛造時に、被加工材の上面と下
面は、上型と下型のそれぞれ平坦な型面で固定された状
態で被加工材の塑性変形が進む。その塑性変形は、被加
工材の上面と下面はほとんど流動することなく、他の部
分が流動するという態様で進む。
（３）据込鍛造時には、とくに、固定された状態にある
被加工材の角部に歪みが集中してその部分における細粒
化が進むので、鍛造終了後の再結晶粒の成長が促進さ
れ、その結果、得られた鍛造材に粗粒が発生してくるも
のと考えられる。(2) At the time of upset forging, the upper and lower surfaces of the work piece are plastically deformed while being fixed to the upper and lower die surfaces by the respective flat die surfaces. The plastic deformation progresses in such a manner that the upper surface and the lower surface of the material to be processed hardly flow and other portions flow. (3) During upset forging, strain concentrates particularly on the corners of the work piece that is in a fixed state, and grain refinement proceeds at that portion, so the growth of recrystallized grains after the forging is promoted. As a result, it is considered that coarse particles are generated in the obtained forged material.
【０００８】（４）したがって、被加工材の角部に歪み
が集中しない状態で据込鍛造を行えば、粗粒の発生は防
止または抑制できるものと考えられる。そのためには、
被加工材の角部を切除して歪みの集中箇所を除去したの
ち据込鍛造を行うことが有効であると考えられる。しか
しながら、そのような処置は、被加工材の歩留まり低下
を招くだけではなく、角部の機械的な切除に伴うコスト
発生もあり、工業的には好ましいことであるとはいえな
い。(4) Therefore, it is considered that the generation of coarse grains can be prevented or suppressed by performing the upset forging in a state where the strain is not concentrated on the corners of the workpiece. for that purpose,
It is considered effective to carry out upset forging after cutting off the corners of the work material to remove the concentration of strain. However, such a treatment is not industrially preferable because it not only causes a reduction in the yield of the material to be processed but also causes a cost associated with mechanical cutting of the corners.
【０００９】本発明者らは、以上の観点に立って種々の
検討を加え、粗粒発生を解消することができる本発明の
熱間据込鍛造方法を開発するに至った。すなわち、本発
明の熱間据込鍛造方法は、熱間で据込鍛造を行うに先立
ち、被加工材の角部に面取り加工を施すことを特徴とす
る。具体的には、前記面取り加工が、前記被加工材の角
部のみを押圧する型面を有する型を用いて行われる熱間
据込鍛造方法が提供される。The present inventors have made various studies from the above viewpoints, and have developed the hot upsetting method of the present invention capable of eliminating the generation of coarse grains. That is, the hot upset forging method of the present invention is characterized by chamfering a corner portion of a work material prior to hot upsetting. Specifically, there is provided a hot upset forging method in which the chamfering process is performed using a mold having a mold surface that presses only the corners of the workpiece.
【００１０】[0010]
【発明の実施の形態】本発明方法は、マルテンサイト系
およびオーステナイト系の耐熱鋼に適用して有効であ
る。例えば、Ｃｒ濃度が５質量％以上であるオーステナ
イト系の工具鋼やＮｉ濃度が５質量％以上であるオース
テナイト系の耐熱鋼、更には、ＳＵＨ１，ＳＵＨ３，Ｓ
ＵＨ４，ＳＵＨ１１，ＳＵＨ６００，ＳＵＨ６１０など
のマルテンサイト系の耐熱鋼や、ＳＵＨ３５，ＳＵＨ３
６，ＳＵＨ３７，ＳＵＨ３８，ＳＵＨ３０９，ＳＵＨ３
１０，ＳＵＨ３３０，ＳＵＨ６６０，ＳＵＨ６６１など
のオーステナイト系の耐熱鋼の据込鍛造に適用すること
ができる。BEST MODE FOR CARRYING OUT THE INVENTION The method of the present invention is effective when applied to martensitic and austenitic heat resistant steels. For example, an austenitic tool steel having a Cr concentration of 5 mass% or more, an austenitic heat-resistant steel having a Ni concentration of 5 mass% or more, and further, SUH1, SUH3, S
Martensitic heat resistant steels such as UH4, SUH11, SUH600, SUH610, SUH35, SUH3
6, SUH37, SUH38, SUH309, SUH3
It can be applied to upset forging of austenitic heat resistant steels such as 10, SUH330, SUH660 and SUH661.
【００１１】また、０.０８％Ｃ−０.４％Ｓｉ−０.８
％Ｍｎ−０.５％Ｎｉ−１０.５％Ｃｒ−０.８％Ｍｏ−
０.０２％Ｎ−６％Ｃｏ−０.１８％Ｖ−Ｎｂ−Ｂのオー
ステナイト系耐熱鋼も適用対象である。本発明において
は、据込鍛造を行うに先立ち、被加工材の角部に面取り
加工が行われる。Further, 0.08% C-0.4% Si-0.8
% Mn-0.5% Ni-10.5% Cr-0.8% Mo-
Austenitic heat-resisting steel of 0.02% N-6% Co-0.18% V-Nb-B is also applicable. In the present invention, a chamfering process is performed on a corner portion of a material to be processed before performing upset forging.
【００１２】具体的には、図１で示したように、まず型
面が平坦面になっている下型１Ｃの中央位置に、所定温
度に加熱された被加工材２を配置する。そして、図１で
示した上型１Ｄで被加工材２を軽く押圧する。この上型
１Ｄの型面１ｄは被加工材２の上面に対して凹曲面にな
っている。したがって、上型１Ｄを図の矢印で示したよ
うに降下すると、その型面は、被加工材２の上部角部の
円周２ａを押圧することにより面取り加工を施す。Specifically, as shown in FIG. 1, first, the work material 2 heated to a predetermined temperature is placed at the center of the lower die 1C having a flat die surface. Then, the workpiece 2 is lightly pressed by the upper die 1D shown in FIG. The mold surface 1d of the upper mold 1D is a concave curved surface with respect to the upper surface of the workpiece 2. Therefore, when the upper die 1D is lowered as shown by the arrow in the figure, the die surface is chamfered by pressing the circumference 2a of the upper corner of the workpiece 2.
【００１３】したがって、角部２ａとその近傍の材料
は、従来のように型面で固定した状態にはならず、ラン
ダムに流動して塑性変形を起こし、角部２ａに歪みが集
中することはなくなる。ついで、被加工材２を上下反転
した状態で下型１Ｃに配置し、前記面取り加工を施した
反対側の角部２ｂが、同様にして、上型１Ｄで押圧され
る。Therefore, the corner portion 2a and the material in the vicinity thereof are not in a fixed state on the mold surface as in the conventional case, but are randomly flowed to cause plastic deformation, and the strain is not concentrated on the corner portion 2a. Disappear. Next, the workpiece 2 is placed on the lower mold 1C in an upside-down state, and the chamfered opposite corner 2b is similarly pressed by the upper mold 1D.
【００１４】なお、後段の据込鍛造時における粗粒発生
を起こさせないためには、上記した面取り工程で、被加
工材をＣ３０、またはＲ３０程度の面取り状態にすれば
充分である。また、用いる上型の型面は上記したような
凹曲面であることに限定される必要はなく円錐面であっ
てもよく、要は、その型面が、被加工材を上型で押圧し
たときに、被加工材の角部を押圧し、被加工材の角部の
円周面取りができるような形状になっていればよい。ま
た、下型の型面も角部を押圧する形状になっていてもよ
い。In order to prevent coarse grains from being generated during upsetting forging in the latter stage, it is sufficient to make the work material into a chamfered state of about C30 or R30 in the above chamfering step. Further, the mold surface of the upper die used is not limited to the concave curved surface as described above, and may be a conical surface. The point is that the die surface presses the workpiece with the upper die. At this time, it is sufficient that the shape is such that the corner of the material to be processed is pressed and the chamfering of the corner of the material to be processed can be performed. Further, the mold surface of the lower mold may also be shaped to press the corners.
【００１５】本発明においては、このように角部の面取
りが行われたのち、その被加工材は据込鍛造される。据
込鍛造は図４で示したように従来と同様にして行っても
よいが、粗粒発生を防ぐという点では次の条件を採用す
ることが好ましい。すなわち、１ヒート当たりの鍛錬比
を５０％以下に設定することである。この鍛錬比を５０
％より大きくすると、面取りが行われているとはいえ、
やはりやや大きな粗粒が発生するようになるからであ
る。In the present invention, after the corners are chamfered in this manner, the workpiece is upset forged. The upset forging may be performed in the same manner as the conventional one as shown in FIG. 4, but it is preferable to adopt the following conditions from the viewpoint of preventing the generation of coarse particles. That is, the training ratio per heat is set to 50% or less. This training ratio is 50
If it is larger than%, it is chamfered, but
This is because, after all, large coarse particles will be generated.
【００１６】なお、被加工材の鋼種によっても異なる
が、この据込鍛造時において、被加工材は９００〜１０
００℃に加熱した状態で据込鍛造を行い、そのときの鍛
造終止温度は８５０〜１０５０℃の範囲内にとどめるこ
とが好ましい。加熱温度が９００℃より低い場合には、
鍛造材にワレやカケが発生しやすくなり、また１０００
℃より高くすると加熱による組織の成長が起こり、組織
が巨大化するという問題が生じはじめるからである。ま
た鍛造終止温度を８５０℃より低くすると、鍛造材にワ
レやカケが発生するという問題が生じ、１０５０℃より
高くすると再結晶粒の成長が進むからである。Although it depends on the steel type of the work material, the work material is 900 to 10 at the time of this upsetting.
It is preferable to perform upset forging in a state of being heated to 00 ° C, and to keep the forging final temperature at that time within the range of 850 to 1050 ° C. If the heating temperature is lower than 900 ° C,
It is easy for cracks and chips to occur on the forged material.
This is because if the temperature is higher than 0 ° C., the tissue grows due to heating and the problem that the tissue becomes huge begins to occur. Also, if the forging end temperature is lower than 850 ° C., there is a problem that cracks and chips are generated in the forged material, and if it is higher than 1050 ° C., recrystallized grains grow.
【００１７】なお、この据込鍛造時に、押圧面に複数の
凹凸模様が形成されているパンチ（へらパンチという）
で被加工材の加工面を万遍なく押出すると、歪みを全体
に分散させることができるので粗粒発生の抑制にとって
は有効である。A punch having a plurality of concavo-convex patterns formed on a pressing surface during the upsetting (called a spatula punch)
When the processed surface of the material to be processed is uniformly extruded, the strain can be dispersed over the entire surface, which is effective for suppressing the generation of coarse particles.
【００１８】[0018]
【実施例】据込鍛造素材として、鋼種ＳＵＨ６６０から
成り、外形寸法が直径４００mm，高さ６８５mmである被
加工材を用意した。この被加工材を、温度１１００℃に
加熱し、図１で示したようにして面取りを行い、図３で
示したように、両端の円周角部がＣ３０で面取りされて
いる被加工材Ａ1にした。Example As the upset forging material, there was prepared a work material made of steel type SUH660 and having outer dimensions of 400 mm in diameter and 685 mm in height. This work material is heated to a temperature of 1100 ° C., chamfered as shown in FIG. 1, and as shown in FIG. 3, work material A whose circumferential corners at both ends are chamfered at C30. I set it to 1 .
【００１９】ついで、この被加工材を温度１１００℃に
加熱して据込鍛造を行った。据込鍛造は、上面に１回、
ついで被加工材を反転させて下面に１回、合計２回行
い、直径５４０mm，高さ３８０mmの鍛造材Ａ2にした
（図３）。このときの鍛錬比は、４４.５％である。つ
いで、この鍛造材を温度１１００℃に再加熱して鍛錬比
３４.２％で据込鍛造を行い、直径６５０mm，高さ２５
０mmの鍛造材Ａ3にした（図３）。Then, this work material was heated to a temperature of 1100 ° C. to carry out upset forging. Upset forging once on the upper surface,
Then, the material to be processed was inverted, and once on the lower surface, a total of two times was performed to obtain a forged material A 2 having a diameter of 540 mm and a height of 380 mm (FIG. 3). The training ratio at this time is 44.5%. Then, the forged material was reheated to a temperature of 1100 ° C. and upset forging was performed at a forging ratio of 34.2% to obtain a diameter of 650 mm and a height of 25.
It was made into a 0 mm forged material A 3 (Fig. 3).
【００２０】鍛造材Ａ3１０個を高さ方向に切断し、そ
の切断面に腐食処理を行い、その表層から１０mm下の箇
所において、中心部ａ’3と、素材の円周角部に相当す
る中心から半径２００mmの２箇所ａ3，ａ3における結晶
粒の大きさを観察した。比較のために、角部の面取りを
行わなかったことを除いては実施例と同様の据込鍛造を
行い、その場合の結晶粒の大きさも観察した。結果を表
１に示す。なお、粒径はＡＳＴＭ法で測定した。Ten forged materials A 3 were cut in the height direction, the cut surface was subjected to corrosion treatment, and at a position 10 mm below the surface layer, the center part a ′ 3 and the circumferential corner part of the material were obtained. The size of the crystal grains at two locations a 3 and a 3 with a radius of 200 mm from the center was observed. For comparison, upset forging was performed in the same manner as in the example except that the chamfering of the corner was not performed, and the size of the crystal grain in that case was also observed. The results are shown in Table 1. The particle size was measured by the ASTM method.
【００２１】[0021]
【表１】 [Table 1]
【００２２】表１から明らかなように、本発明を適用す
ることにより粗粒発生は防止されている。すなわち、面
取り工程の有用性は極めて明瞭である。なお、鍛造材Ａ
3の製造時における鍛錬比を６０％にして鍛造材を製造
し、上記したａ3の箇所における粒径を測定したとこ
ろ、平均値で＃３.５であり、粗粒発生の抑制効果は実
施例１の場合よりも優れていた。As is clear from Table 1, the application of the present invention prevents the generation of coarse particles. That is, the usefulness of the chamfering process is extremely clear. Forging material A
When a forging material was manufactured with a forging ratio of 60% at the time of manufacturing No. 3 , and the particle size at the above-mentioned location of a 3 was measured, the average value was # 3.5, and the effect of suppressing the generation of coarse particles was carried out. It was better than in Example 1.
【００２３】[0023]
【発明の効果】以上の説明で明らかなように、本発明方
法は据込鍛造時における粗粒発生を有効に防止すること
ができる。これは、据込鍛造に先立ち、被加工材の角部
に面取りを施して据込鍛造時における歪み集中が起こら
ないようにした効果である。As is apparent from the above description, the method of the present invention can effectively prevent the generation of coarse particles during upset forging. This is the effect of chamfering the corners of the material to be processed before upset forging to prevent strain concentration during upset forging.
【図１】被加工材の面取りを行う状態を示す概略図であ
る。FIG. 1 is a schematic view showing a state in which a workpiece is chamfered.
【図２】面取り後の被加工材を示す側面図である。FIG. 2 is a side view showing a work material after chamfering.
【図３】実施例で製造する被加工材と鍛造材の寸法関係
を示す概略図である。FIG. 3 is a schematic view showing a dimensional relationship between a work material and a forged material manufactured in an example.
【図４】据込鍛造を行う状態を示す概略図である。FIG. 4 is a schematic view showing a state in which upset forging is performed.
【図５】従来の据込鍛造で得られた鍛造材を示す概略図
である。FIG. 5 is a schematic view showing a forged material obtained by conventional upset forging.
１Ａ，１Ｃ 下型 １Ｂ，１Ｄ 上型 １ｄ 上型の型面 ２，Ａ1 被加工材 ２’，Ａ2，Ａ3 鍛造材 ２ａ，２ｂ 被加工材２の角部 ３ 粗粒1A, 1C Lower mold 1B, 1D Upper mold 1d Upper mold surface 2, A 1 Work material 2 ', A 2 , A 3 Forging material 2a, 2b Corner part 3 of work material 2 Coarse grain
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大森 重信 群馬県渋川市石原500番地 大同特殊鋼株 式会社渋川工場内 Ｆターム(参考） 4E087 AA01 CA31 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Shigenobu Omori 500 Ishihara, Shibukawa City, Gunma Daido Steel Co., Ltd. Shibukawa factory F-term (reference) 4E087 AA01 CA31
Claims (4)
材の角部に面取り加工を施すことを特徴とする熱間据込
鍛造方法。1. A hot upset forging method comprising chamfering a corner portion of a material to be processed prior to hot upset forging.
のみを押圧する型面を有する型を用いて行われる請求項
１の熱間据込鍛造方法。2. The hot upsetting method according to claim 1, wherein the chamfering process is performed by using a mold having a mold surface that presses only a corner portion of the workpiece.
ート当たり５０％以下である請求項１の熱間据込鍛造方
法。3. The hot upset forging method according to claim 1, wherein the forging ratio during the upset forging is 50% or less per heat.
温度域に設定される請求項１の熱間据込鍛造方法。4. The hot upsetting method according to claim 1, wherein the final forging temperature is set in a temperature range of 850 to 1050 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002072431A JP2003266140A (en) | 2002-03-15 | 2002-03-15 | Hot upsetting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002072431A JP2003266140A (en) | 2002-03-15 | 2002-03-15 | Hot upsetting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003266140A true JP2003266140A (en) | 2003-09-24 |
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ID=29202432
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH705602A1 (en) * | 2011-10-12 | 2013-04-15 | Hatebur Umformmaschinen Ag | Method for manufacturing mold, involves cutting a portion of metallic bar material and chamfering both ends of cut portion of metallic bar material before supplying cut portion to single-step transformation device |
| CN103100626A (en) * | 2011-11-14 | 2013-05-15 | 上海重型机器厂有限公司 | Forging method for forged steel supporting rolls used for rolling mill of large-scale wide thick plates |
| WO2016103316A1 (en) * | 2014-12-22 | 2016-06-30 | 株式会社日立製作所 | Material shape for hot upset forging |
| CN107008837A (en) * | 2017-05-10 | 2017-08-04 | 鞍钢重型机械有限责任公司 | A kind of inexpensive open die forging method of large-scale edger roll forging |
-
2002
- 2002-03-15 JP JP2002072431A patent/JP2003266140A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH705602A1 (en) * | 2011-10-12 | 2013-04-15 | Hatebur Umformmaschinen Ag | Method for manufacturing mold, involves cutting a portion of metallic bar material and chamfering both ends of cut portion of metallic bar material before supplying cut portion to single-step transformation device |
| CN103100626A (en) * | 2011-11-14 | 2013-05-15 | 上海重型机器厂有限公司 | Forging method for forged steel supporting rolls used for rolling mill of large-scale wide thick plates |
| WO2016103316A1 (en) * | 2014-12-22 | 2016-06-30 | 株式会社日立製作所 | Material shape for hot upset forging |
| JPWO2016103316A1 (en) * | 2014-12-22 | 2017-04-27 | 株式会社日立製作所 | Material shape for hot upset forging |
| CN107008837A (en) * | 2017-05-10 | 2017-08-04 | 鞍钢重型机械有限责任公司 | A kind of inexpensive open die forging method of large-scale edger roll forging |
| CN107008837B (en) * | 2017-05-10 | 2019-02-22 | 鞍钢重型机械有限责任公司 | A kind of inexpensive open die forging method of large size edger roll forging |
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