JP5915937B2 - Forging production method - Google Patents
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- JP5915937B2 JP5915937B2 JP2012118121A JP2012118121A JP5915937B2 JP 5915937 B2 JP5915937 B2 JP 5915937B2 JP 2012118121 A JP2012118121 A JP 2012118121A JP 2012118121 A JP2012118121 A JP 2012118121A JP 5915937 B2 JP5915937 B2 JP 5915937B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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Description
本発明は、熱間据込鍛造による鍛造材の製造方法に関するものである。 The present invention relates to a method for producing a forging material by hot upset forging.
従来から、製品の機械的性質の向上や引け巣の圧着といった内部性状の向上を目的として、鋼や合金等の素材に熱間で据込鍛造を施し、結晶粒を微細化して組織の均一化が行なわれている。
この据込鍛造では、素材の長さをＬとし、直径をＤとしたときのＬ／Ｄ比が大きい、つまりＤに対してＬが長いと、据込鍛造を行う際に、軸方向から加圧された素材の中央部ないしその近傍に座屈が生じる。このため、座屈を生じない素材形状の条件としてＬ／Ｄを３以下にすべきことが経験上知られている。
Conventionally, for the purpose of improving the mechanical properties of products and the improvement of internal properties such as crimping shrinkage, hot upsetting forging materials such as steel and alloys are used to refine the crystal grains and make the structure uniform. Has been done.
In this upsetting forging, when the length of the material is L and the diameter is D, the L / D ratio is large. Buckling occurs at or near the center of the pressed material. For this reason, it is known from experience that L / D should be 3 or less as a material shape condition that does not cause buckling.
この長尺材を据込鍛造したときに生じる座屈を抑制するために、たとえば特許文献１には、自由変形部分のＬ／Ｄが３以下になるように工夫されている。具体的には、軸状素材の軸方向の一部が径外方向に変形するのを阻止するために、径外方向変形阻止用の円筒状金型を用いて据込圧下し、次いで軸状素材を反転して軸方向に圧縮して変形を阻止した部分を自由鍛造することが提案されている。特許文献１に開示される据込鍛造法は、Ｌ／Ｄが３を超える細長い長尺素材に対し、径外方向の変形を可能な限り抑制することで、座屈を生じさせることなく鍛造することができ、座屈やしわ疵の発生を抑制できるという点で有用な技術である。 In order to suppress buckling that occurs when the long material is upset forged, for example, Patent Document 1 devises the L / D of the free deformation portion to be 3 or less. Specifically, in order to prevent a part of the axial direction of the shaft-shaped material from being deformed in the radially outward direction, the upsetting pressure is reduced using a cylindrical mold for preventing deformation in the radially outward direction, and then the shaft-shaped material is It has been proposed to perform free forging of the portion where the material is reversed and compressed in the axial direction to prevent deformation. The upsetting forging method disclosed in Patent Document 1 performs forging without causing buckling by suppressing deformation in the outer radial direction as much as possible with respect to an elongated long material having an L / D exceeding 3. This technique is useful in that it can suppress the occurrence of buckling and wrinkles.
上述した特許文献１に開示される据込鍛造法は、Ｌ／Ｄが３を超える細長い素材を用いても、座屈を生じさせることなく鍛造できる点では有利である。
しかしながら、特許文献１に開示される据込鍛造法は、素材の一方を拘束し他方の片側から成形するものである。この据込鍛造法は、素材を安定して配置させるために、素材寸法に合わせた金型を用いることが必要である。そのため、場合によっては、据込量に応じた複数個の径外方向変形阻止用の金型を準備する必要がある上、型換えに伴う素材の再加熱も必要となる。
また、上記の据込鍛造法においては、素材の一方を所定高さだけ径外方向変形阻止用の金型を使用して拘束するものである。従い、金型に拘束されていない部分は、いわゆる自由鍛造となる。このため、自由鍛造部分では、軸方向の任意の一部が径外方向に変形したり、径外方向変形阻止用金型と上型との間にバリが発生したりする場合がある。このように、鍛造素材の一部が自由に変形すると、次工程での型入れ鍛造をするためには、鍛造素材の変形した部分を次工程で必要な所定の形状に改めて鍛造したり、バリを切削したりする必要があり、鍛造材の歩留り低下や工数の増加を招く虞がある。
The upsetting forging method disclosed in Patent Document 1 described above is advantageous in that forging can be performed without causing buckling even when an elongated material having an L / D exceeding 3 is used.
However, the upsetting forging method disclosed in Patent Document 1 is one in which one of the materials is constrained and molded from the other side. In this upsetting forging method, it is necessary to use a die matched to the size of the material in order to stably arrange the material. For this reason, in some cases, it is necessary to prepare a plurality of molds for preventing deformation in the radial direction according to the amount of upsetting, and it is also necessary to reheat the material accompanying mold change.
In the upsetting forging method described above, one of the materials is restrained by a predetermined height by using a die for preventing deformation in the radially outward direction. Therefore, the portion not restrained by the mold is so-called free forging. For this reason, in the free forging portion, an arbitrary part in the axial direction may be deformed radially outward, or burrs may be generated between the radially outward deformation prevention die and the upper die. In this way, when a part of the forging material is freely deformed, in order to carry out mold forging in the next process, the deformed part of the forging material is forged again into a predetermined shape required in the next process, There is a possibility that the yield of the forged material may be reduced and the number of man-hours may be increased.
本発明の目的は、上記問題に鑑み、据込鍛造時の変形量を素材長手方向の両側から調整することにより座屈の問題を解決し、尚且つ歩留りの向上や工数の低減することができる鍛造材の製造方法を提供することである。 In view of the above problems, the object of the present invention is to solve the buckling problem by adjusting the deformation amount during upsetting forging from both sides in the longitudinal direction of the material, and to improve the yield and reduce the number of steps. It is to provide a method for producing a forging material.
本発明者は、所定の押え型と中間型とを用いて上下両方向から圧下する手法を採用することで、座屈の発生を抑え、歩留りの向上と工数の低減ができることを見出し本発明に到達した。 The present inventor has found that by adopting a method of pressing down from both the upper and lower directions using a predetermined presser mold and an intermediate mold, occurrence of buckling can be suppressed, yield can be improved, and man-hour can be reduced. did.
すなわち本発明は、柱状素材の一方端の型押し部となる第１押え型と、前記柱状素材の他方端の型押し部となる第２押え型と、これらの押え型の間にあって柱状の型空間を有する中間型とを具備する金型セットにより、据込鍛造を行なう鍛造材の製造方法であって、前記中間型の型空間に加熱した柱状素材を挿入し、前記第１押え型を下方に配置し、前記第２押え型を上方に配置して、前記第２押え型側から前記柱状素材を軸方向に所定長さ据込圧下する第１据込鍛造工程を行い、次いで前記柱状素材とともに前記金型セットの上下を反転させ、前記第２押え型を下方に配置し、前記第１押え型を上方に配置して、前記第１押え型側から前記柱状素材を軸方向に所定長さ据込圧下する第２据込鍛造工程を行う、鍛造材の製造方法である。 That is, the present invention provides a first presser mold that serves as a mold pressing part at one end of a columnar material, a second presser mold that serves as a mold pressing part at the other end of the columnar material, and a columnar mold between these presser molds. A method for producing a forging material that performs upset forging by a mold set including an intermediate mold having a space, wherein a heated columnar material is inserted into the mold space of the intermediate mold, and the first presser mold is moved downward. A first upset forging step in which the second presser die is arranged at the upper side, and the columnar material is subjected to upset pressure by a predetermined length in the axial direction from the second presser die side, and then the columnar material In addition, the upper and lower sides of the mold set are reversed, the second presser mold is disposed below, the first presser mold is disposed above, and the columnar material is axially extended from the first presser mold side by a predetermined length. It is a manufacturing method of a forging material which performs the 2nd upsetting forge process which carries out upside down pressure reduction.
また、本発明は、前記第２据込鍛造工程の後に、さらに前記鍛造材を一対の成形型で構成される空間に挿入し、前記成形型で圧下して鍛造材を得る型鍛造工程を具備する鍛造材の製造方法である。
また、本発明は、前記据込鍛造工程と前記型鍛造工程との間には、被鍛造材を再加熱する再加熱工程を具備することが好ましい。
In addition, the present invention further includes a die forging step in which the forging material is further inserted into a space constituted by a pair of forming dies after the second upsetting forging step, and the forging material is obtained by reduction with the forming die. It is the manufacturing method of the forging material to do.
Moreover, it is preferable that this invention comprises the reheating process which reheats a to-be-forged material between the said upset forging process and the said die forging process.
本発明によれば、長尺素材を用いても座屈を生じさせることなく、鍛造材を効率よく提供することができ、鍛造品の製造にとって有用な技術となる。 According to the present invention, a forged material can be efficiently provided without causing buckling even when a long material is used, which is a useful technique for manufacturing a forged product.
上述したように、本発明の重要な特徴は、柱状素材を軸方向に所定長さ据込圧下する第１据込鍛造工程と、第２据込鍛造工程の２つの据込鍛造工程を採用したことにある。これにより、たとえばＬ／Ｄが３を超える細長い素材を用いても、座屈の発生を抑制しつつ鍛造できる。以下、図面を用いて本発明を詳しく説明する。 As described above, the important feature of the present invention employs two upsetting forging processes, a first upsetting forging process and a second upsetting forging process in which the columnar material is axially pressed down by a predetermined length. There is. Thereby, for example, even if an elongated material having an L / D exceeding 3 is used, forging can be performed while suppressing the occurrence of buckling. Hereinafter, the present invention will be described in detail with reference to the drawings.
図１は、本発明の鍛造材の製造方法を模式的に表したものである。図１に示す第１押え型１と第２押え型２は、それぞれ柱状素材４の端部を拘束するための金敷と、柱状素材４を軸方向に所定長さ据込圧下するための型押し部の両方の作用をもたらすものである。
第１押え型１と第２押え型２は、柱状素材４のそれぞれの端部を拘束するために、柱状素材４の横断面に近似した型彫面を形成しておくことが好ましい。また、第１押え型１と第２押え型２に形成する型彫面を型鍛造工程で成形される鍛造材の端部横断面に近似した形状にしておくと、鍛造素材を型鍛造工程で必要な所定の形状に改めて鍛造したり、切削したりする必要がなくなり、鍛造材の歩留り向上や工数の短縮という効果を得ることができる。
FIG. 1 schematically shows a method for producing a forged material according to the present invention. A first presser mold 1 and a second presser mold 2 shown in FIG. 1 are an anvil for restraining the end of the columnar material 4 and a mold presser for lowering the columnar material 4 by a predetermined length in the axial direction. This brings about both functions.
The first presser mold 1 and the second presser mold 2 are preferably formed with a mold engraving surface that approximates the cross section of the columnar material 4 in order to constrain the respective ends of the columnar material 4. In addition, if the mold engraving surfaces formed on the first presser mold 1 and the second presser mold 2 have a shape that approximates the end cross section of the forged material formed in the mold forging process, the forging material is formed in the mold forging process. There is no need to re-forge or cut into the required predetermined shape, and the effect of improving the yield of the forged material and shortening the number of steps can be obtained.
本発明は、第１押え型１と第２押え型２の間に柱状の型空間を有する中間型３を設ける。中間型３の柱状の型空間９は、据込代であり、柱状素材４が変形しても座屈やバリの発生を抑制する空間となり、素材の性状に合わせて空間形状を調整する。
この型空間９は、柱状素材４の直径に対し、１．２倍以上の直径を有する空間を形成することが好ましい。これにより、据込代の確保が可能となり、座屈させることなく据込圧下することができる。一方、型空間９は、柱状素材４の直径に対し、１．５倍以下の直径を有する空間を形成することが好ましい。これにより、座屈を生じることなく据込圧下することができる。
本発明で適用する第１押え型１と第２押え型２は、コンクリート等で基礎が施された地面上に配置することが好ましい。これにより、柱状素材４に圧下力を確実に加えて据込圧下することができる。
In the present invention, an intermediate die 3 having a columnar die space is provided between the first presser die 1 and the second presser die 2. The columnar mold space 9 of the intermediate mold 3 is an upsetting allowance, and is a space that suppresses the occurrence of buckling and burrs even if the columnar material 4 is deformed, and adjusts the space shape according to the properties of the material.
The mold space 9 preferably forms a space having a diameter of 1.2 times or more the diameter of the columnar material 4. As a result, it is possible to secure an upsetting allowance and to reduce the upsetting pressure without buckling. On the other hand, the mold space 9 preferably forms a space having a diameter of 1.5 times or less the diameter of the columnar material 4. Thereby, the upsetting pressure can be reduced without causing buckling.
It is preferable that the first presser mold 1 and the second presser mold 2 applied in the present invention are arranged on the ground on which the foundation is made of concrete or the like. As a result, it is possible to reliably apply a rolling force to the columnar material 4 and to reduce the upsetting pressure.
本発明は、図１（ａ）に示すように、先ず、上記で説明した第１押え型１と第２押え型２およびこれらの間にあって柱状の型空間を有する中間型３とで構成される金型セットを準備する。そして、第２押え型２を開放して加熱した柱状素材４を中間型３に挿入し、第２押え型２を柱状素材４の上部に配置する。
次に、本発明は、第１据込鍛造工程として、図１（ｂ）に示すように、第１押え型１を下方に配置し、第２押え型２を上方に配置した状態にする。そして、第２押え型２側から柱状素材４を軸方向に所定長さ据込圧下する。ここで、所定長さとは、柱状素材４の直径が型空間９の直径を超えない範囲まで据込圧下し、第２押え型２と中間型３とで形成される予備空間を残すことができる長さをいう。これにより、バリを発生させることなく柱状素材５を据込圧下することができる。
次に、本発明は、第２据込鍛造工程として、図１（ｃ）に示すように、柱状素材４を金型セットに入れたまま、金型セットを上下反転させて、第２押え型２を下方に配置して、第１押え型１を上方に配置した状態とする。このとき、柱状素材４が中間型３の中を第１押え型１の方向にスライドすると同時に、第２押え型２と中間型３とで形成される予備空間が消失し、その結果として第１押え型１と中間型３との間に新たな予備空間が形成される。そして、第１押え型１側から柱状素材４を軸方向に所定長さ据込圧下する。ここで、所定長さとは、型空間９を充満させることができる長さをいう。これにより、図１（ｄ）に示すような所定形状の被鍛造材５が得られる。
As shown in FIG. 1 (a), the present invention first comprises a first presser mold 1 and a second presser mold 2 described above and an intermediate mold 3 having a columnar mold space between them. Prepare the mold set. Then, the columnar material 4 heated by opening the second presser mold 2 is inserted into the intermediate mold 3, and the second presser mold 2 is disposed on the upper part of the columnar material 4.
Next, in the present invention, as shown in FIG. 1B, the first presser die 1 is arranged below and the second presser die 2 is arranged upward as the first upset forging step. Then, the columnar material 4 is lowered by a predetermined length in the axial direction from the second presser mold 2 side. Here, the predetermined length means that the columnar material 4 can be set up to a range where the diameter of the columnar material 4 does not exceed the diameter of the mold space 9, leaving a spare space formed by the second presser mold 2 and the intermediate mold 3. Say length. As a result, the columnar material 5 can be lowered without causing burrs.
Next, in the present invention, as shown in FIG. 1 (c), the second presser die is turned upside down while the columnar material 4 is placed in the mold set as the second upsetting forging process. 2 is arranged below, and the first presser mold 1 is arranged above. At this time, the columnar material 4 slides in the intermediate mold 3 in the direction of the first presser mold 1, and at the same time, the spare space formed by the second presser mold 2 and the intermediate mold 3 disappears. A new spare space is formed between the presser mold 1 and the intermediate mold 3. Then, the columnar material 4 is lowered by a predetermined length in the axial direction from the first presser mold 1 side. Here, the predetermined length means a length that can fill the mold space 9. Thereby, the to-be-forged material 5 of the predetermined shape as shown in FIG.1 (d) is obtained.
本発明によれば、座屈が生じやすいといわれているＬ／Ｄが３を超える細長い素材を据込む際に、据込圧下量を２回に分割して、尚且つ金型を反転させて鍛造することにより、単純な一方向からの据込圧下で生じる軸方向の一部に集中した径外方向の変形量を少なくすることができる。これにより、柱状素材４の座屈や変形を抑制しつつ、径外方向の変形量を抑えることができる。
また、本発明は、柱状の型空間を有する一組の金型セットのみを用いて据込鍛造するので、据込量に応じて複数個の金型を別途用意する必要がなくなる上、据込鍛造工程において型換えに伴う素材の再加熱もする必要がなく、費用の削減および工数の低減が可能となる。
According to the present invention, when installing an elongated material whose L / D, which is said to be easily buckled, exceeds 3, the upsetting amount is divided into two times and the mold is inverted. By forging, it is possible to reduce the amount of deformation in the radially outward direction concentrated on a part of the axial direction that occurs under a simple upsetting pressure from one direction. Thereby, the deformation amount in the radial direction can be suppressed while suppressing buckling and deformation of the columnar material 4.
Further, since the present invention performs upset forging using only one set of molds having a columnar mold space, it is not necessary to prepare a plurality of molds separately according to the upset amount. In the forging process, it is not necessary to reheat the material accompanying mold change, and it is possible to reduce costs and man-hours.
本発明で据込圧下を行う駆動装置としては、例えば、油圧駆動、水圧駆動およびモータ駆動等を用いることができる。本発明では、高荷重を得ることができ、第１押え型１と第２押え型２の軸方向の位置制御がしやすい油圧駆動を用いることが好ましい。
また、本発明において、柱状素材４とともに金型セットを上下反転する方法としては、例えば、第１押え型１、第２押え型２および中間型３とをボルトやキーあるいはピンにより固定して一体の金型セットとし、マニプレータで前記金型セットを掴んで反転させる方法が適用できる。
For example, hydraulic drive, hydraulic drive, motor drive, or the like can be used as the drive device that performs the upsetting pressure in the present invention. In the present invention, it is preferable to use a hydraulic drive that can obtain a high load and can easily control the position of the first presser mold 1 and the second presser mold 2 in the axial direction.
In the present invention, as a method of vertically flipping the die set together with the columnar material 4, for example, the first presser mold 1, the second presser mold 2 and the intermediate mold 3 are fixed integrally with bolts, keys, or pins. It is possible to apply a method of holding the mold set with a manipulator and reversing the mold set.
次に、本発明に付加できる加工形態について説明する。本発明においては、上記の据込鍛造後、所定形状の鍛造材を得るために、型鍛造を追加することができる。例えば、図２（ａ）に示すように、先ず、成形型７を下にして、一対の成形型６、７で構成される空間に、成形型６を開放して上記で得られた被鍛造材５を挿入し、成形型６を被鍛造材５の上部に配置する。次いで、図２（ｂ）に示すように、成形型６側から被鍛造材５を所定長さ圧下する型鍛造工程を経ることで、所定形状の鍛造材８を得ることができる。 Next, processing modes that can be added to the present invention will be described. In the present invention, die forging can be added to obtain a forged material having a predetermined shape after the upsetting forging. For example, as shown in FIG. 2 (a), first, the forging obtained by opening the forming die 6 in the space formed by the pair of forming dies 6, 7 with the forming die 7 facing down. The material 5 is inserted, and the forming die 6 is disposed on the forged material 5. Next, as shown in FIG. 2B, a forged material 8 having a predetermined shape can be obtained by performing a die forging process in which the forged material 5 is reduced by a predetermined length from the mold 6 side.
成形型６、７の形状としては、例えば、単純な柱状形状や、長手方向の中央部が膨らんだ形状といった種々の形状が選択できる。
例えば、長手方向の中央部に膨らみを有する鍛造材は、以下のように製造することができる。
図２（ａ）に示すように、先ず、第１据込工程および第２据込工程で予め被鍛造材５の端部を、成形型６、７の型彫面に挿入できるように成形しておく。
次に、図２（ｂ）に示すように、被鍛造材５の長手方向の中央部に膨らみを有した上下一対の成形型６、７で構成される空間に被鍛造材５を挿入して、型空間を充満するように被鍛造材５を圧下する。これにより、本発明は、型鍛造工程でも座屈やバリの発生を抑制しつつ、長手方向の中央部に膨らみを有した鍛造材８を得ることができる。
尚、本発明は、据込鍛造工程と鍛造工程との間には、被鍛造材を鍛造温度まで再加熱する再加熱工程を設けることが好ましい。これにより、本発明は、上記で説明した据込工程から鍛造工程へ移る際に、被鍛造材の温度低下による加工時の疵の発生を抑制することができる。
As the shapes of the molds 6 and 7, various shapes such as a simple columnar shape and a shape in which a central portion in the longitudinal direction swells can be selected.
For example, a forging material having a bulge in the central portion in the longitudinal direction can be manufactured as follows.
As shown in FIG. 2 (a), first, the end of the forged material 5 is formed in advance in the first upsetting process and the second upsetting process so that it can be inserted into the mold engraving surfaces of the forming dies 6, 7. Keep it.
Next, as shown in FIG. 2 (b), the forging material 5 is inserted into a space formed by a pair of upper and lower forming dies 6 and 7 having a bulge in the central portion in the longitudinal direction of the forging material 5. The forged material 5 is reduced so as to fill the mold space. Thereby, this invention can obtain the forging material 8 which has the swelling in the center part of the longitudinal direction, suppressing generation | occurrence | production of buckling and a burr | flash in a die forging process.
In the present invention, it is preferable to provide a reheating step for reheating the material to be forged to the forging temperature between the upsetting forging step and the forging step. Thereby, this invention can suppress generation | occurrence | production of the flaw at the time of the process by the temperature fall of a to-be-forged material, when moving to the forging process from the upsetting process demonstrated above.
本発明で適用できる柱状素材は、あらゆるサイズが適用でき、特に直径Ｄ＝５０〜２００ｍｍ、長さＬ＝１５０〜１０００ｍｍの大きさが好適である。
また、本発明は、座屈やバリを生じることなく、上記柱状素材の長さを１／２Ｌ〜１／４Ｌの範囲に据込圧下するのに好適である。
また、本発明は、上記で据込圧下した被鍛造材を、さらに一対の成形型で直径Ｄ＝１００〜２５０ｍｍ、長さＬ＝１００〜８００ｍｍの鍛造材に加工するのに好適である。
Any size can be applied to the columnar material applicable in the present invention, and in particular, the diameter D = 50 to 200 mm and the length L = 150 to 1000 mm are preferable.
In addition, the present invention is suitable for downsetting the length of the columnar material in the range of 1 / 2L to 1 / 4L without causing buckling or burring.
Moreover, this invention is suitable for processing the to-be-forged material which carried out upsetting pressure above into a forging material with diameter D = 100-250 mm and length L = 100-800 mm further with a pair of shaping | molding die.
１．第１押え型、２．第２押え型、３．中間型、４．柱状素材、５．被鍛造材、
６．成形型、７．成形型、８．鍛造材、９．型空間
1. 1. First presser type, 2. Second presser type, Intermediate type, 4. 4. Columnar material, Forged material,
6). 6. Mold, Mold, 8. Forging, 9. Type space
Claims (3)
前記中間型の型空間に加熱した柱状素材を挿入し、前記第１押え型を下方に配置し、前記第２押え型を上方に配置して、前記第２押え型側から前記柱状素材を軸方向に所定長さ据込圧下する第１据込鍛造工程を行い、
次いで前記柱状素材とともに前記金型セットの上下を反転させ、前記第２押え型を下方に配置し、前記第１押え型を上方に配置して、前記第１押え型側から前記柱状素材を軸方向に所定長さ据込圧下する第２据込鍛造工程を行うことを特徴とする鍛造材の製造方法。 A first presser mold that serves as a mold pressing part at one end of the columnar material, a second presser mold that serves as a mold pressing part at the other end of the columnar material, and an intermediate mold that has a columnar mold space between these presser molds A forging material manufacturing method for upsetting forging with a mold set comprising:
The heated columnar material is inserted into the mold space of the intermediate mold, the first presser mold is disposed below, the second presser mold is disposed above, and the columnar material is pivoted from the second presser mold side. Perform a first upsetting forging process in which the upsetting pressure is reduced by a predetermined length in the direction,
Next, the mold set is turned upside down with the columnar material, the second presser mold is disposed below, the first presser mold is disposed above, and the columnar material is pivoted from the first presser mold side. A method for producing a forging material, comprising performing a second upsetting forging step in which the upsetting pressure is reduced by a predetermined length in a direction.
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| JP6881135B2 (en) * | 2017-08-03 | 2021-06-02 | 日本製鉄株式会社 | Mold forging member manufacturing method and mold forging member manufacturing equipment |
| CN110695304B (en) * | 2019-10-17 | 2021-01-05 | 浙江凯名瑞汽车部件股份有限公司 | Machining method for spherical shell forging of automobile |
| CN112008030B (en) * | 2020-09-27 | 2024-06-18 | 东风汽车紧固件有限公司 | Cold upsetting forming processing method and mold for semicircular head bolt |
| TWI829041B (en) * | 2021-12-07 | 2024-01-11 | 國立高雄科技大學 | Constrained rough forging die |
| CN114700453B (en) * | 2021-12-27 | 2024-01-26 | 内蒙古北方重工业集团有限公司 | Technological method for upsetting steel ingot with ultra-large height-to-diameter ratio in limited space |
| CN114393167A (en) * | 2022-01-06 | 2022-04-26 | 钢铁研究总院 | Upsetting forming die and process for flanged hollow long shaft |
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| JPS6130252A (en) * | 1984-07-19 | 1986-02-12 | Toyota Motor Corp | Method and device for full enclosed die forging of deformed component |
| EP0272067A3 (en) * | 1986-12-18 | 1990-05-09 | Stelco Inc. | Process and apparatus for upset forging of long stands of metal bar stock |
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| JP3256885B2 (en) * | 1993-02-16 | 2002-02-18 | 大同特殊鋼株式会社 | Long steel forging method |
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| CN101972830A (en) * | 2010-11-02 | 2011-02-16 | 武汉理工大学 | Hot upsetting process for cast ingot with large height to diameter ratio for ultra large ring forging |
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