JPH04200833A - Production of cold forged product - Google Patents
Production of cold forged productInfo
- Publication number
- JPH04200833A JPH04200833A JP33308990A JP33308990A JPH04200833A JP H04200833 A JPH04200833 A JP H04200833A JP 33308990 A JP33308990 A JP 33308990A JP 33308990 A JP33308990 A JP 33308990A JP H04200833 A JPH04200833 A JP H04200833A
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- product
- cold forged
- forged product
- punch
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000003825 pressing Methods 0.000 claims description 11
- 230000000452 restraining effect Effects 0.000 claims description 8
- 239000011343 solid material Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 11
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000003100 immobilizing effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 25
- 239000000463 material Substances 0.000 description 11
- 238000001125 extrusion Methods 0.000 description 5
- 238000010273 cold forging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、フランジ付中空形状品を冷間鍛造により製
造する冷間鍛造品の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a cold forged product by cold forging a flanged hollow product.
［従来の技術］
我国における冷間鍛造技術は、自動車産業を中心に発達
してきたが、その技術の応用は他分野にも広がり、自動
車部品の他に、電気部品、写真機部品、並びに冷凍機部
品などへ用途が拡大している。[Conventional technology] Cold forging technology in Japan has been developed mainly in the automobile industry, but the application of this technology has spread to other fields, and in addition to automobile parts, it has been applied to electrical parts, camera parts, and refrigerators. Applications are expanding to include parts.
適用鋼種においても、当初は低炭素鋼を主な対象として
いたが、徐々にその適用範囲が広かり、今日では中炭素
鋼、低合金鋼、合金鋼、並びに軸受鋼のみならず快削鋼
をも冷間鍛造することができるようになっている。また
、製品形状の複雑化も進み、小物部品を大量生産する場
合には、冷間鍛造が製造方法の主流を占めている。例え
ば、フランジ付中空形状品は、後方押出加工により肉厚
のフランジ部の上にスリーブを形成する。In terms of applicable steel types, initially low carbon steel was the main target, but the scope of application has gradually expanded, and today it is applicable not only to medium carbon steel, low alloy steel, alloy steel, and bearing steel, but also to free cutting steel. It can also be cold forged. In addition, product shapes are becoming more complex, and cold forging has become the mainstream manufacturing method when mass producing small parts. For example, in the case of a flanged hollow product, a sleeve is formed on the thick flange portion by backward extrusion.
フランジ付中空形状品を製造する場合は、フランジ付き
の中実素材５をダイス１のメピン４上に装入し、フラン
ジ部５ｂをクツションスリーブ２で拘束した状態で、素
材の中央曲部分をパンチ３で押し、素材を後方（パンチ
の押し方向に対して逆方向）へ押し出す。後方押出しの
結果、第４図に示すように、クツションスリーブ２とパ
ンチ３との間にスリーブ部５ａが形成され、中空形状品
となる。When manufacturing a flanged hollow product, the flanged solid material 5 is loaded onto the mechanical pin 4 of the die 1, and with the flange portion 5b restrained by the cushion sleeve 2, the central curved part of the material is Push with punch 3 to push the material backwards (in the opposite direction to the pushing direction of the punch). As a result of the backward extrusion, as shown in FIG. 4, a sleeve portion 5a is formed between the cushion sleeve 2 and the punch 3, resulting in a hollow product.
［発明が解決しようとする課題］
しかしなから、従来の製造方法においては、ス１１−ブ
部５ａの付け根の部分に多数の割れか生（。[Problems to be Solved by the Invention] However, in the conventional manufacturing method, many cracks are formed at the base of the sleeve portion 5a.
ることかある。スリーブ（＝Ｉけ根部に割れか存在する
と、製品の外観を損なうばかりてなく、疲労強度等の機
械的強度か低Ｉ・−するので、割れｈヅ１−した製品は
その程度の如ｒｉｉ＋を問わす不良品と１２で廃棄する
。このように従来の製造方法では製品の歩留まりが低く
、生産性の向上４図ることか要望され−Ｃいる。There are some things. If there is a crack at the base of the sleeve (I), it will not only spoil the appearance of the product, but also lower the mechanical strength such as fatigue strength. If the product is defective, it will be discarded.As described above, the yield of the product is low in the conventional manufacturing method, and there is a need to improve productivity.
この発明は、上記の間ｈＸｆＪ点を解〆友するためにな
さねたものであって、後方押８づ加工のときに、フラン
ジ付中空形状品のスリーブイ・ｊ１シ根部分に割れを生
しない冷間鍛造品の製造方法を提供することをｌコｌ的
とする。This invention was made in order to resolve the hXfJ point mentioned above, and prevents cracks from occurring at the base of the sleeve of a hollow shaped product with a flange during backward pressing. Our objective is to provide a method for manufacturing cold forged products.
［課題を解決伏−るための手段］
発明者らは、製品のスリーブイ・ｊ（）根に割れか生じ
る原因につき種々調べた結果、スリーブイ・ｊけ根部イ
・）においてフランジ部からスリーブ部へ向かう金属材
オー１の流動抵抗か大きくなるこ吉をＦＬ出たＬまた。[Means for solving the problem] As a result of various investigations into the causes of cracks occurring at the sleeve root of the product, the inventors found that cracks occur from the flange portion to the sleeve portion in the sleeve root portion (a) of the product. The flow resistance of the metal material O 1 that is heading towards Kokichi increases as the FL exits the L again.
こ才］は、クツシー３レスリーブの端面が平坦であるた
めに、フランジ部の押え面における材料の変形流動が大
きく抑制されることに起因すると推察される。そこで、
金型形状につき種々検討を重ね、クツションスリーブの
形状を変更することに想到した。This is presumed to be due to the fact that the end surface of the shoe sleeve is flat, so that the deformation and flow of the material on the pressing surface of the flange portion is greatly suppressed. Therefore,
After various studies regarding the shape of the mold, we came up with the idea of changing the shape of the cushion sleeve.
この発明に係る冷間鍛造品の製造方法は、中実素材の本
体部の外周に張り出すフランジ部を形成１７、内力に向
かって後退傾斜する押え（＝Ｉけ而を白゛する環状の拘
束部祠で該フランジ部を押さえ付：」つつ、該中天素材
の本体部に押込部材を押し７込み、該押込部祠と該拘束
部祠とて形成される間隙に該本体部を変形流入させ、ス
リーブ部を形成することを特徴とする。The method for manufacturing a cold forged product according to the present invention includes forming a flange portion 17 that protrudes from the outer periphery of a main body portion of a solid material, and forming an annular restraint that tilts backward toward an internal force (=I). Hold down the flange part with a parting hole: Push the pushing member into the main body part of the hollow material, and deform and flow the main body part into the gap formed by the pushing part part and the restraining part part. and forming a sleeve portion.
［作用］
この発明に係る冷間鍛造品の製造方法においては、環状
拘束部材の押え付け面を内方に向かって後退傾斜させて
いるので、環状拘束部材で素材を拘束しつつ、押込み部
材で素材本体部を押し込むと、旧材は環状拘束部Ｈの押
えイ・ｊけ而及び内周面に沿ってフランジ部からスリー
ブ部へ緩やかに流動する。このため、スリーブ部の付け
根における祠！−１の流動抵抗か緩和され、割１１の発
生が抑制されろ。[Function] In the method for manufacturing a cold forged product according to the present invention, the pressing surface of the annular restraining member is inclined backward inward, so that while the material is restrained by the annular restraining member, the pressing member can When the material body is pushed in, the old material flows gently from the flange portion to the sleeve portion along the pressers A, J and the inner peripheral surface of the annular restraining portion H. For this reason, the shrine at the base of the sleeve! The flow resistance of -1 will be eased and the occurrence of 11 will be suppressed.
「実施例］
以下、添附の図面を参［Ｈ＜ｉ ｌ−５て本発明の実施
例について具体的に説明する。``Examples'' Examples of the present invention will be specifically described below with reference to the attached drawings.
第２図は本発明の実施例に係る冷間鍛造品の製造方法に
用いられるプレス機の金型部分を示す縦断面図−Ｃある
。プレス機１０は、後方押出加工機とｌで用いられるも
のであって、油圧シリンダ（図示せず）によりパンチ〕
３がｙ？降するようになっている。FIG. 2 is a vertical sectional view -C showing a mold portion of a press machine used in the method for manufacturing a cold forged product according to an embodiment of the present invention. The press machine 10 is used as a rear extrusion processing machine, and is used for punching with a hydraulic cylinder (not shown).
3 is y? It's starting to rain.
ダイス１１かプレス機１し）の下部本体上に設けられ、
上部本体から下垂するクツションスリーブ］２及びパン
チ１３に相対している。ダイス１１の凹所に（Ｊメピン
］４か嵌め込まれており、中実素材″、２０かメビン１
４の−にに位置するようにダイス１］の凹所に装入さね
ている。provided on the lower body of the die 11 or the press 1),
The cushion sleeve] 2 and the punch 13 hang down from the upper body. (J Mepin) 4 is inserted into the recess of die 11, and the solid material ", 20 or Mevin 1 is inserted into the recess of die 11.
The die is inserted into the recess of the die 1 so that it is located at the minus position of 4.
クツションスリーブ］２及びパンチ１３は同軸に設けら
れ、クツションスリーブ１２か昇降する、、−、−５＝
と共に、パンチ１Ｂがクツションスリーブ］２の中を昇
降するよ・うになっている。クツションスリーブ１２は
スクリコーウ機構（図示せず）の駆動軸に連結され、パ
ンチ１３は油圧機構（図示せず）の駆動軸に連結されて
いる。なお、クツションスリーブ］２及びパンチ１３の
昇降動作は、シーケンスコントローラ（図示せず）によ
り連動制御されるようになっている。The cushion sleeve 2 and the punch 13 are coaxially arranged, and as the cushion sleeve 12 moves up and down, the punch 1B moves up and down inside the cushion sleeve 2. The cushion sleeve 12 is connected to a drive shaft of a screw mechanism (not shown), and the punch 13 is connected to a drive shaft of a hydraulic mechanism (not shown). Incidentally, the lifting and lowering operations of the cushion sleeve] 2 and the punch 13 are controlled in conjunction with each other by a sequence controller (not shown).
中実素材２０は、全体が平たい円柱形状をなり、、フラ
ンジ部２０ｂが本体部から張り出すように形成されてい
る。The solid material 20 has a flat cylindrical shape as a whole, and a flange portion 20b is formed so as to protrude from the main body portion.
押え例は而１２ａとしてのクツションスリーブ１２の下
端面は、テーバ状に形成されている。このテーバ状の押
えイ］け而］、 ２ ａは、内方に向かって後退傾斜し
ている。押えイ」け而１２ａの傾斜角度αは、軸直交面
（水平面）に対して０．５〜３゜の範囲内にある。この
傾斜角度αは、小さくとりすぎても大きくとりすぎても
不都合であり、軸直交面に対１７て０．５〜３″の角度
であることが好ま１７い。この理由は、傾斜角度が０６
５°を下回ると、−６−一
従来の平坦な押え付け面を有する拘束部材との間に有意
な差異が認められなくなり、一方、傾斜角度が３°を上
回ると、製品のフランジ厚さが所定の規格値から外れや
すくなるからである。すなわち、従来の拘束部材では、
押え付け面が平坦であるために、ダイハイド等を調整す
ることにより製品のフランジ厚さを容易に調節すること
ができるが、本発明の拘束部月（クツションスリーブ１
２）では、押え付け面をテーパ状にしているために、こ
の傾きが３°を越えると、最終的な製品のフランジ厚さ
を規格範囲内にすることが困難になるからである。The lower end surface of the cushion sleeve 12, which is an example of a presser 12a, is formed into a tapered shape. This tapered presser foot 2a is inclined backward inward. The inclination angle α of the presser foot 12a is within the range of 0.5 to 3 degrees with respect to the plane perpendicular to the axis (horizontal plane). It is inconvenient to set the inclination angle α too small or too large, and it is preferable that the inclination angle α is 0.5 to 3″ with respect to the plane perpendicular to the axis.The reason for this is that the inclination angle 06
When the inclination angle is less than 5°, there is no significant difference between -6-1 and the conventional restraint member having a flat pressing surface.On the other hand, when the inclination angle exceeds 3°, the flange thickness of the product This is because it is easy to deviate from the predetermined standard value. In other words, in the conventional restraining member,
Since the pressing surface is flat, the flange thickness of the product can be easily adjusted by adjusting diehide etc.
In 2), since the pressing surface is tapered, if this inclination exceeds 3 degrees, it will be difficult to keep the flange thickness of the final product within the standard range.
次に、第１図乃至第３図を参照しながら、上記の中実素
４Ａ’ ２０を後方押出加工して、フランジ付き中空形
状品を製造する場合について説明する。Next, with reference to FIGS. 1 to 3, a case will be described in which the solid element 4A' 20 is backwardly extruded to produce a flanged hollow product.
直径２８ｍｍの炭素鋼丸棒を所定長に切断し、これを冷
間ですえ込み鍛造して、フランジ部２０ｂを張り出し形
成する。このようにして成形された中実素材２０の後方
押出加工前における各部寸法は、フランジ部２０ｂの径
が４６．５ｍ＋ｎｓフランジ部２０ｂの高さが１２．５
ｍＩｎ、本体部の径が２２．７ｍｍ、本体部の高さがｌ
Ｏ，５ｎｖである（工程３］）。A carbon steel round bar with a diameter of 28 mm is cut to a predetermined length, and this is cold swaged and forged to form an overhanging flange portion 20b. The dimensions of each part of the solid material 20 formed in this manner before backward extrusion processing are as follows: diameter of the flange portion 20b is 46.5 m + ns height of the flange portion 20 b is 12.5 m
mIn, the diameter of the main body is 22.7 mm, the height of the main body is l
O,5nv (Step 3]).
第２図に示すように、フランジ部２０ｂが下側のメピン
１４に接する位置となるように、中実素材２０をダイス
１１の凹所に装入する（工程３２）クッンヨンスリーブ
１２を下降させ、スリーブ端面のテーパ伏抑え込み面１
２ａで素材のフランジ部２０ｂを約７トンの力で押え込
み、素材２０を拘束する（］二程３３）。As shown in FIG. 2, the solid material 20 is inserted into the recess of the die 11 so that the flange portion 20b is in contact with the lower mechanical pin 14 (step 32). The sleeve 12 is lowered. and the tapered downward pressing surface 1 of the sleeve end surface.
2a presses down the flange portion 20b of the material with a force of about 7 tons to restrain the material 20 (Step 2 33).
次いで、パンチ１３を所定ストロークたけ下降させ、素
材２０の本体部にパンチ１３の先端部を約７０１−ンの
力で押し込み、後方押出しする。第１図に示すように、
クツションスリーブ１２とパンチ１３とで形成された間
隙に素オイ本体部の材料が変形流入し、スリーブ部２０
ａが形成される（工程３４）。このようにして後方押出
加工された結果、素材２０は中空形状品に成形され、そ
の各部寸法は、スリーブ部２０ａの内径及び外径がそれ
ぞれＬＰｒ、４ｍｍ及び２２．９ｍｍ、スリーブ部２０
ａの長さが２６１′ｌ１ｌｎ１フランジ部２０ｂの径が
４８ 、 Ｌａｍ、フランジ部２０ｂの高さが１．２．
５１１１ｍとなった。Next, the punch 13 is lowered by a predetermined stroke, and the tip of the punch 13 is pushed into the main body of the material 20 with a force of approximately 701-tons, and is pushed backward. As shown in Figure 1,
The material of the main body part deforms and flows into the gap formed between the cushion sleeve 12 and the punch 13, and the sleeve part 20
a is formed (step 34). As a result of the backward extrusion process, the material 20 is formed into a hollow-shaped product, and the dimensions of each part are as follows: the inner diameter and outer diameter of the sleeve portion 20a are LPr, 4 mm and 22.9 mm, respectively;
The length of a is 261'l1ln1, the diameter of flange portion 20b is 48, Lam, and the height of flange portion 20b is 1.2.
It became 5111m.
メピン］４により中空形状品２０を突き上げ、ダイス１
１の凹所から中空形状品２０を取り出し、各所に張り出
したパリを除去して最終製品形状に仕上げる（工程３５
）。Push up the hollow shaped product 20 with Mepin] 4, and press the die 1
The hollow-shaped product 20 is taken out from the recess 1, and the parts protruding from various places are removed to form the final product shape (step 35).
).
クッンヨンスリーブ１２の押え込み面］、 ２ ａの傾
斜角度αを種々変更して、上記のフランジ付中実素材を
それぞれ２８０００個ずつ後方押出加工し、スリーブ付
け根部の割れ発生率につき調べた。なお、割れ発生率は
、全数検査により求めた。その結果、傾斜角度αがＯ″
（平坦面）、０．５°。The inclination angle [alpha] of [the pressing surface] and 2a of the sleeve 12 was variously changed, and 28,000 of the flanged solid materials described above were each backwardly extruded, and the incidence of cracking at the base of the sleeve was investigated. Incidentally, the crack occurrence rate was determined by a 100% inspection. As a result, the inclination angle α is O″
(flat surface), 0.5°.
１°、２°、３６のときに、これらに対応する割れ発生
率はそれぞれ１３％、７％、５％、１．５％、０．３％
となり、スリーブ付け根部の割れの発生を大幅に低減す
ることができた。At 1°, 2°, and 36°, the corresponding crack occurrence rates are 13%, 7%, 5%, 1.5%, and 0.3%, respectively.
As a result, we were able to significantly reduce the occurrence of cracks at the base of the sleeve.
［発明の効果］
この発明によれば、環状拘束部材の押え付け面をテーパ
形状にするという簡易な構造の変更により、フランジ付
中空形状品のスリーブ（＝１根部における割れの発生を
激減させることができる。割れ発生率が低下するため、
プレス作業能率が大幅に向上するとともに、後工程にお
ける製品検査の能率が高まる。[Effects of the Invention] According to the present invention, the occurrence of cracks at the root of a flanged hollow-shaped sleeve (=1) can be drastically reduced by a simple structural change in which the pressing surface of the annular restraining member is made into a tapered shape. Since the cracking incidence rate is reduced,
This greatly improves press work efficiency and improves the efficiency of product inspection in the post-process.
第１図および第２図はそれぞれ本発明の実施例に係る冷
間鍛造品の製造方法に用いられるプレス機の一部を示す
縦断面図、第３図は本発明の実施例に係る冷間鍛造品の
製造方法を示す工程図、第４図は従来のプレス機の一部
を示す縦断面図である。
１１・・・ダイス、１２・・クツションスリーブ（環状
拘束部材）、１２ａ・・・押え込み面、１３・パンチ（
押込み部材）、１４・・・メビン、２０・・素祠出願人
代理人 弁理士 鈴江武彦1 and 2 are longitudinal cross-sectional views showing a part of a press machine used in a method for manufacturing a cold forged product according to an embodiment of the present invention, and FIG. FIG. 4 is a process diagram showing a method for manufacturing a forged product, and is a longitudinal sectional view showing a part of a conventional press machine. 11...Die, 12...Cushion sleeve (annular restraint member), 12a...Press surface, 13. Punch (
(pushing member), 14... Mevin, 20... Patent attorney Takehiko Suzue, agent for Sosa applicant
Claims (1)
、内方に向かって後退傾斜する押え付け面を有する環状
の拘束部材で該フランジ部を押さえ付けつつ、該中実素
材の本体部に押込部材を押し込み、該押込部材と該拘束
部材とで形成される間隙に該本体部を変形流入させ、ス
リーブ部を形成することを特徴とする冷間鍛造品の製造
方法。A flange is formed on the outer periphery of the main body of the solid material, and the flange is pressed down by an annular restraining member having a pressing surface that slopes backward inward. A method for producing a cold forged product, comprising: pushing a pushing member into the body, and causing the main body portion to deform and flow into the gap formed by the pushing member and the restraining member, thereby forming a sleeve portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33308990A JPH04200833A (en) | 1990-11-29 | 1990-11-29 | Production of cold forged product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33308990A JPH04200833A (en) | 1990-11-29 | 1990-11-29 | Production of cold forged product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04200833A true JPH04200833A (en) | 1992-07-21 |
Family
ID=18262151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33308990A Pending JPH04200833A (en) | 1990-11-29 | 1990-11-29 | Production of cold forged product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04200833A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7013696B2 (en) * | 2002-04-19 | 2006-03-21 | Ngk Spark Plug Co., Ltd. | Method of making a flanged tubular metallic part |
| US20110011146A1 (en) * | 2009-07-20 | 2011-01-20 | Joseph Huang | Method of forming a tenon on one side of a metal plate member |
| JP2014091148A (en) * | 2012-11-02 | 2014-05-19 | Nippon Steel & Sumitomo Metal | Press forming method of cup-shaped member |
| CN104043764A (en) * | 2013-03-11 | 2014-09-17 | 本田技研工业株式会社 | Forging method and device thereof |
| JP2022132666A (en) * | 2021-02-23 | 2022-09-09 | 株式会社島田製作所 | Press processing method for metal |
-
1990
- 1990-11-29 JP JP33308990A patent/JPH04200833A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7013696B2 (en) * | 2002-04-19 | 2006-03-21 | Ngk Spark Plug Co., Ltd. | Method of making a flanged tubular metallic part |
| US20110011146A1 (en) * | 2009-07-20 | 2011-01-20 | Joseph Huang | Method of forming a tenon on one side of a metal plate member |
| US8689598B2 (en) * | 2009-07-20 | 2014-04-08 | Ho E Screw & Hardware Co., Ltd. | Method of forming a tenon on one side of a metal plate member |
| JP2014091148A (en) * | 2012-11-02 | 2014-05-19 | Nippon Steel & Sumitomo Metal | Press forming method of cup-shaped member |
| CN104043764A (en) * | 2013-03-11 | 2014-09-17 | 本田技研工业株式会社 | Forging method and device thereof |
| JP2014172075A (en) * | 2013-03-11 | 2014-09-22 | Honda Motor Co Ltd | Forging method and apparatus therefor |
| CN104043764B (en) * | 2013-03-11 | 2016-03-23 | 本田技研工业株式会社 | Forging processing method and device thereof |
| JP2022132666A (en) * | 2021-02-23 | 2022-09-09 | 株式会社島田製作所 | Press processing method for metal |
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