JPS5982139A - Production of forged connecting rod - Google Patents

Abstract

PURPOSE:To increase the yield of material and to improve productivity by forming a blank material by cross roll forging to an intermediate forging, subjecting the same to rough finishing by TR forging and forming the rough finished material by closed forging into a finish shape. CONSTITUTION:A blank material M cut to a prescribed length is heated to a prescribed forging temp. in a heating furnace and is formed to a roll-shaped intermediate forgming M1 while the volume is precisely distributed by cross roll forging; at the same time, excess end materials m1, m1 are cut off from the main body M1. Said material is subjected to the rough finish forming wherein the larger ends are subjected to upsetting and U-shaping working simultaneously by TR forging. Such material is finish formed of detailed parts by closed forging in the final stage, whereby a forged connecting rod C is obtd. The deburring stage is thus eliminated and the yield of material is improved.

Description

【発明の詳細な説明】 この発明は、自動車用のエンジンをはじめ各種動力機械
のクランクｍ　Ｉ！１１に組み込まれるコンロッドの製
造工程に於いて、機械切削加工を施す前の鍛造成形品を
製造する方法に関するもので、その目的は、各々成形手
段の異なった王様の鍛造方式を組み合わせた特殊な鍛造
方法によって材料歩留りを著しく向上し得るコンロッド
の新しいｌ１ｌｖ造方法を確立することにある。DETAILED DESCRIPTION OF THE INVENTION This invention provides a crank mI! for various power machines including automobile engines. This relates to a method for manufacturing forged products before mechanical cutting in the manufacturing process of connecting rods incorporated in 11, and its purpose is to create a special forging product that combines various forging methods with different forming methods. The object of the present invention is to establish a new method for manufacturing connecting rods that can significantly improve material yield.

従来、此の種の鍛造品をＭ造するには、第１図Ｕ）のよ
うに所定長に切断した棒状の素材ＣＭ＋をドロップハン
マによる延ばしくドロー）と丸め（ロール）工程の組み
合わせ、或いはプレスによる丸め工程又は鍛造ロールに
ょ′る圧延工程の併用によって、第１図（ロ）のような
中間鍛造品に成形した後、これを鍛造プレスで荒地（２
回打ち）、仕上（１回打ち）の型打ち成形を行なって第
１図（ハ）のような形状に成形し、最後にトリミングプ
レス等によりバ！Ｊ　（ｍ＋を切除して第１図（ニ）の
ように１個乃至数個の製品（ｃｌを得ることが多い。Conventionally, in order to make this type of forged product by M, a bar-shaped material CM+ cut to a predetermined length is stretched using a drop hammer (draw) and a combination of rolling (roll) processes, as shown in Fig. 1 (U), or After forming into an intermediate forged product as shown in Figure 1 (b) by a combination of a rounding process using a press or a rolling process using a forging roll, this is then rolled into a rough area (2 mm) using a forging press.
Perform the finishing (single punching) and finishing (single punching) stamping to form the shape as shown in Figure 1 (C), and finally use a trimming press etc. to form the shape. J(m+ is often excised to obtain one to several products (cl) as shown in FIG. 1(d).

然しなから、このような方法でフンロッド鍛造品を１１
１Ｉ！市する場合、その材料取りに際しては通常のスケ
ールＨ１失や切断損失のほか、掴み代やスプルー損失は
勿；ｊＳ！１．コンロッドのように形状の拶雑な鍛４１
品では少なくとも２５〜３０％程度の大きなフラッシュ
！！、（失を見込んでおく必要があるので、素材と製品
との材料歩留りは約５５〜６０％と非゛常に悪く、これ
がコンロッド鋼１貴品の生産性向上を推進する上での最
も大きな畔点になっていた。However, using this method, 11 hun rod forged products were made.
1I! In addition to the normal scale H1 loss and cutting loss, gripping allowance and sprue loss must be taken into account when taking the material; jS! 1. Forged 41 with a rough shape like a connecting rod
A large flash of at least 25-30% for products! ! (Since it is necessary to take into account losses, the material yield between raw materials and products is extremely poor at approximately 55-60%. This is the most important factor in promoting productivity improvement of connecting rod steel 1 precious products. It was a dot.

本発明方法は、前記の問題を解決するために開発された
ものであって、以下にその実施部様を［′４面について
具体的ｅこ説明する。The method of the present invention was developed to solve the above-mentioned problem, and its implementation will be specifically explained below.

第２１図（イ）（口１（７）（に）（力は本発明による
フンロッド花Ａ１品のｇｌｌ　７４工程を示したもので
、例えばニッケル゛クロム臼）、ニッケル１クロム拳モ
リブデン鋼などフンロッドに適した睦シ材を各種の損失
を見込んだオロシ重ｐ［となるように第２図（イ）のよ
うに所定長に切断したものを素材（川とし、前記素材（
Ｍ）を高周波イ１導加熱炉や高速ガス加熱炉等を用いて
所定の誰造濡度に加熱した後、先ずクロスロール鍛造に
より精密に体積配分を行ないながら第２図（川の９１１
＜ロール状の中間＃名品（λりに成形し、同時に余分の
端１４　（ｍ：Ｉ）（ｍ、ｌ）を主体（Ｍυから切落す
。Figure 21 (a) (mouth 1 (7) (ni) (force) shows the gll 74 process of Hunrod flower A1 product according to the present invention, such as nickel-chromium mill, nickel-1 chromium knuckle molybdenum steel A material (river) is a material (a material) that is cut into a predetermined length as shown in Figure 2 (a) so that the weight of the material is p[, taking into account various losses.
M) is heated to a predetermined degree of wetness using a high-frequency induction heating furnace or a high-speed gas heating furnace, and then cross-roll forging is used to precisely distribute the volume.
<Mold into a roll-shaped intermediate product (λ), and at the same time cut off the excess ends 14 (m:I) (m, l) from the main body (Mυ).

ｎＩＪ記のようにして中間Ｈａ品（川）の成形が完了し
たならば、次にこれを公知のＴＲ鍛造により大きい方の
端部（ｙ＋＋２＋に第２図（ハ）のようなツブシ加工と
第２図（ニ）のような０字加工とを同時に施す荒仕上成
形を行なった後、最終の工程に於いて密閉鍛造（フロー
ティングダイ方式による型鍛造で可能）により細部の仕
上成形を行ない、第２図（ホ）に示すようなコンロッド
鍛造品ｆＣ１を得る。After completing the forming of the intermediate Ha product (river) as described in nIJ, the larger end (y++2+) is rounded and rounded as shown in Fig. After performing rough finish forming, which includes 0-shaped machining at the same time as shown in Figure 2 (D), in the final process, detailed finish forming is performed by closed forging (possible with die forging using the floating die method). A connecting rod forged product fC1 as shown in FIG. 2 (E) is obtained.

上述の如く、本発明の方法では、コンロッド鍛造品を製
造する場合に、夫々成形手段の全く昂なった三様の持株
な鍛造方式、即ちクロスロール鍛造、Ｔ　Ｒ６１々０、
密閉鍛造の各方式を巧みに駆ｆ中し、独自の方法により
成形を行なうので、従来方法の場合と違って、クロスロ
ール鍛造工程では素材の体ｆｌＩ配分が極めて精密に行
なわれ、”　Ｒｆｉ　ｉ工程ではツブシ加工と０字加工
とが同時に施され、またＴＴ’ｌ鍛造及び密閉鍛造の両
工程ではパリの張り出しが皆無であるため、パリ切除の
工程が不要になり、米Ｈにスプルーを設ける必要もなく
、全工程を通じクロスロール鍛造時に僅かな燻材が出る
だけで、これ以外に材料の無駄が出ないため、素材と製
品との材料歩留りを約８５〜９０％まで向上することが
可能になる。As mentioned above, in the method of the present invention, when manufacturing a connecting rod forged product, three types of forging methods are used, each having a completely improved forming means, namely, cross roll forging, T R61 and 0,
Unlike conventional methods, the material is distributed extremely precisely in the cross-roll forging process, as each method of closed forging is skillfully utilized to form the product using a unique method. In the process, burr machining and zero-shaped machining are performed at the same time, and in both the TT'l forging and closed forging processes, there is no overhang of the burr, so the burr removal process is not necessary, and a sprue is installed on rice H. There is no need for this, only a small amount of smoked wood is produced during cross-roll forging throughout the entire process, and no other material is wasted, making it possible to improve the material yield between raw materials and products to approximately 85-90%. become.

従って、本発明方法をコンロッド鍛造品の製〃目・こ適
用すれば、多年の懸案になっていた問題を一挙に解決し
、材料歩留りを大巾に増大せしめ、コンロッド鍛造品の
生産性を飛躍的に向上さ止ることができる。Therefore, if the method of the present invention is applied to the product size of connecting rod forged products, the problems that have been pending for many years will be solved at once, the material yield will be greatly increased, and the productivity of connecting rod forged products will be dramatically improved. It is possible to stop improving.

【図面の簡単な説明】[Brief explanation of drawings]

第１図（イ）（ロ）を・）（ニ）は従来方法によるフン
Ｈ＋ツド鍛造品の製造工程を示す正面図、第２［ヱ１（
イ）（ロ）（ハ）（ニ）１利は本発明方法によるコンロ
ッド鍛造品の製造工程を示す斜視図である。 （Ｃ）・・コンロッド鍛造品、１ＬＩｌ）・・素オ；ｔ
　、　１．、Ｊ・・パリ、◇１．０・・中間ｐｌ＋）造
品、（ｙｎｌ、）・・燻材、（河→・・端部’　（ｔ：
、　ｕＩ！　Ａ　ヶ　ＩＴＩ　　ゆ　イ＾１．１ミ１仇
、ｊ ７　・、゛１Figures 1 (a), (b), ) (d) are front views showing the manufacturing process of Fun H + Tsudo forged products by the conventional method, and Figure 2 (1)
A) (B) (C) (D) 1) is a perspective view showing the manufacturing process of a connecting rod forged product according to the method of the present invention. (C)...Connecting rod forged product, 1LIl)...Main o;t
, 1. , J... Paris, ◇1.0... intermediate pl+) manufactured product, (ynl,)... smoked wood, (river →... end' (t:
, uI! A ka ITI Yui^1.1mi1 enemy, j 7 ・,゛1

Claims (1)

【特許請求の範囲】[Claims] 所定長に切断された素材をクロスロール鍛造により精密
に体積配分を行ないながらロール状の中間鍛造品に成形
し、次いでＴＲ鍛造により端部のツブシ加工と０字加工
とを同時に施す荒仕上を行なった後、密閉鍛造により最
終の仕上形状に成形することを特徴とするフンロッド鍛
造品の製造方法。The material is cut to a predetermined length and then formed into a roll-shaped intermediate forging using cross-roll forging while accurately distributing the volume.Then, the material is roughly finished by simultaneously applying roughening and zero-shape processing to the edges using TR forging. A method for producing a forged Hunrod product, which is then formed into the final finished shape by closed forging.