JPH0452040A - Formation of cross roll - Google Patents
Formation of cross rollInfo
- Publication number
- JPH0452040A JPH0452040A JP15547590A JP15547590A JPH0452040A JP H0452040 A JPH0452040 A JP H0452040A JP 15547590 A JP15547590 A JP 15547590A JP 15547590 A JP15547590 A JP 15547590A JP H0452040 A JPH0452040 A JP H0452040A
- Authority
- JP
- Japan
- Prior art keywords
- cross
- boss
- dead
- shaft
- roll forming
- 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
Links
- 230000015572 biosynthetic process Effects 0.000 title 1
- 239000000463 material Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 16
- 238000005242 forging Methods 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract 3
- 238000007796 conventional method Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/08—Making machine elements axles or shafts crankshafts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
この発明は、一対のダイスで素材を挟んでそれらのダイ
ス表面を互いに反対方向へ移動させることにより前記素
材を軸状に延ばすクロスロール成形に関し、特には、ク
ロスロール成形により軸状に予備成形した鍛造素材を用
いて鍛造を行った場合でもその鍛造製品の軸線方向端部
内に疵を残さないクロスロール成形方法に関するもので
ある。Detailed Description of the Invention (Industrial Application Field) The present invention relates to cross roll forming in which a pair of dies sandwich a material and the surfaces of the dies are moved in opposite directions to extend the material axially. In particular, the present invention relates to a cross-roll forming method that does not leave any flaws in the axial end portions of the forged product even when forging is performed using a forged material that has been preformed into a shaft shape by cross-roll forming.
(従来の技術)
クロスロール成形を行う方法としては例えは、第6図(
a)、(b)に示すように、鍛造素材Iを、回転するに
従って次第に幅広となる周方向突条部2aを有する一対
のロールダイス2て挟み、それらのロールダイス2を互
いに反対方向へ回転させて、周方向突条部2aを有する
それらの外周面を互いに反対方向へ移動させることによ
り、一対のガイド3による案内下で、鍛造素材1を平行
移動させずに回転させながら、その中央部から回転軸線
方向の両端部へ向けて材料を押し延ばして、軸状に成形
するものがある。(Prior art) An example of a method for cross-roll forming is shown in Figure 6 (
As shown in a) and (b), the forged material I is sandwiched between a pair of roll dies 2 having circumferential protrusions 2a that gradually become wider as they rotate, and the roll dies 2 are rotated in opposite directions. By moving the outer circumferential surfaces having the circumferential protrusions 2a in mutually opposite directions, the central portion of the forged material 1 is rotated without being translated in parallel under the guidance of the pair of guides 3. Some products are formed into a shaft by stretching the material from the beginning toward both ends in the direction of the rotational axis.
ところで、上記クロスロール成形により、例えばクラン
クシャフトを鍛造するための鍛造素材1を、クランクプ
ーリ軸部になる比較的細い棒状の軸端部1aとジャーナ
ル部やカウンタウェイト部になる外径変化部1bとを有
する軸状に体積配分する予備成形を行う場合に、従来は
、第7図(a)〜(C)に示すように、鍛造素材1の軸
線方向の一端部にその棒状の軸端部1aのみを形成して
いた。By the way, by the above-mentioned cross roll forming, the forging material 1 for forging a crankshaft, for example, is formed into a relatively thin rod-shaped shaft end portion 1a that will become a crank pulley shaft portion and an outer diameter changing portion 1b that will become a journal portion or a counterweight portion. When preforming is performed to distribute the volume in an axial manner, conventionally, as shown in FIGS. Only 1a was formed.
(発明か解決しようとする課題)
しかしながら、かかる従来の方法では、上記軸端部1a
を形成する軸線方向端部て鍛造素材lの断面積の減少率
か高くなるため、その軸端部1aの形成中、端部外周部
分のみ特に延はされて、第8図に示すように鍛造素材1
の軸端部1aの中心部分に比較的深いひけ穴ICか残り
、しかもそのひけ穴1cの深さかばらついてしまう。(Problem to be solved by the invention) However, in such a conventional method, the shaft end 1a
Since the reduction rate of the cross-sectional area of the forged material 1 is high at the axial end portion where the axial end portion 1a is formed, only the outer peripheral portion of the end portion is particularly elongated and the forged material 1 is forged as shown in FIG. Material 1
A relatively deep sink hole IC remains at the center of the shaft end 1a, and the depth of the sink hole 1c varies.
これかため、上記従来方法で予備成形した鍛造素材lに
型鍛造成形を施して第9図に示すようにクランクシャフ
ト4を製造し、第10図に示すようにその周囲のバリ5
を除去しても、除去するバリ5中に上記ひけ穴ICの全
ての部分を含ませることかてきず、第11図にも示すよ
うに、クランクシャフト4の一端部のクランクプーリ軸
部4aの中心部分にひけ穴ICに起因する疵4bが残っ
てしまう場合があるという問題かあった。For this reason, a crankshaft 4 as shown in FIG. 9 is manufactured by performing die forging on the forged material l preformed by the above-mentioned conventional method, and the burrs around it are removed as shown in FIG.
Even if the burr 5 is removed, all parts of the sink hole IC cannot be included in the burr 5 to be removed, and as shown in FIG. There was a problem in that a flaw 4b caused by the sink hole IC may remain in the center portion.
この発明は、かかる課題を有利に解決したクロスロール
成形方法を提供するものである。The present invention provides a cross-roll forming method that advantageously solves these problems.
(課題を解決するための手段)
この発明のクロスロール成形方法は、一対のダイスて素
材を挟んでそれらのダイス表面を互いに反対方向へ移動
させることにより前記素材を軸状に延ばすクロスロール
成形を行うに際し、前記素材の軸線方向端部に、外径か
部分的に大きい捨てボス部を形成することを特徴とする
ものである。(Means for Solving the Problems) The cross roll forming method of the present invention involves cross roll forming in which a pair of dies sandwich the material and the surfaces of the dies are moved in opposite directions to extend the material into an axial shape. When carrying out this method, a discarded boss portion having a partially large outer diameter is formed at the axial end portion of the material.
(作用)
かかる方法によれば、素材を軸状に成形する際に、その
軸線方向端部の、外径か部分的に大きい捨てボス部で、
断面積の減少率が低(なるため、軸線方向端部で外周部
分か延ばされる割合か減って、その中心部分に生ずるひ
け穴が極めて浅くなり、しかもひけ穴かその捨てボ不部
で止まってそこよりも奥までは達しなくなる。(Function) According to this method, when forming the material into a shaft shape, at the discarded boss portion at the end in the axial direction, the outer diameter is partially large.
The reduction rate of the cross-sectional area is low (because the rate of elongation of the outer circumference at the axial end is reduced, the sink hole that occurs in the center becomes extremely shallow, and moreover, it stops at the sink hole or its waste hole). It won't reach any deeper than that.
従って、このクロスロール成形方法で予備成形を行って
、鍛造素材を軸状に成形すれば、その鍛造素材に鍛造成
形を施して製品を製造しても、その鍛造素材の軸線方向
端部に残っているひけ穴か極めて浅く、しかも必ず捨て
ボス部で止まるため、製品の周囲の除去するパリ中にそ
のひけ穴の全ての部分を容易に含ませることができるの
で、鍛造製品の軸端部の中心部分にひけ穴に起因する疵
が残ることを確実に防止することができる。Therefore, if preforming is performed using this cross-roll forming method and the forged material is formed into a axial shape, even if the forged material is forged to produce a product, there will remain some residue on the axial end of the forged material. The sink hole in the forged product is extremely shallow and always stops at the waste boss, so all parts of the sink hole can be easily included in the debris to be removed around the product. It is possible to reliably prevent flaws caused by sinkholes from remaining in the center portion.
(実施例)
以下に、この発明の実施例を図面に基づき詳細に説明す
る。(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.
第1図(a)〜(C)は、この発明のクロスロール成形
方法の一実施例における順次の工程をそれぞれ示す断面
図であり、図中6は製品としてのクランクシャフトを型
鍛造するための鍛造素材、7は従来のロールダイス2と
概略同様の形状のロールダイスをそれぞれ示す。FIGS. 1(a) to (C) are cross-sectional views showing the sequential steps in an embodiment of the cross-roll forming method of the present invention, and 6 in the figure is a cross-sectional view for die forging a crankshaft as a product. The forged material 7 indicates a roll die having approximately the same shape as the conventional roll die 2.
ここで一対のロールダイス7は各々、その外周面の周方
向突条部7aの軸線方向(図では左右方向)の一端部に
、特に周方向溝7bを有している。Here, each of the pair of roll dies 7 has, in particular, a circumferential groove 7b at one end in the axial direction (in the left-right direction in the figure) of the circumferential protrusion 7a on its outer peripheral surface.
この実施例の方法では、かかるロールダイス7で鍛造素
材6を挟み、それらのロールダイス7を互いに反対方向
へ回転させて、周方向突条部7aを有するそれらの外周
面を互いに反対方向へ移動させることにより、従来のガ
イド3と同様の図示しない一対のガイドによる案内下で
、鍛造素材6を平行移動させずに回転させなから、第1
図(a)〜(C)に順次に示すように、その中央部から
回転軸線方向の両端部へ向けて材料を押し延ばして、第
2図に示すように、クランクプーリ軸部になる比較的細
い棒状の軸端部6aとジャーナル部やカウンタウェイト
部になる外径変化部6bとを有する軸状に体積配分する
予備成形を行う。In the method of this embodiment, the forged material 6 is sandwiched between the roll dies 7, and the roll dies 7 are rotated in mutually opposite directions to move their outer circumferential surfaces having circumferential protrusions 7a in mutually opposite directions. By doing so, the forging material 6 is not rotated without being translated in parallel under the guidance of a pair of guides (not shown) similar to the conventional guide 3.
As shown in Figures (a) to (C), the material is stretched from the center to both ends in the direction of the rotational axis, and as shown in Figure 2, the material becomes the crank pulley shaft. Preforming is performed to distribute the volume into a shaft having a thin rod-shaped shaft end 6a and an outer diameter changing portion 6b that becomes a journal portion or a counterweight portion.
このクロスロール成形の際に、鍛造素材6の軸線方向の
一端部には、ロールダイス7の周方向溝7bによって、
第1図および第2図に示すように、上記軸端部6aより
もさらに末端寄りの位置に外径が部分的に大きい捨てボ
ス部6Cか形成され、この捨てボス部6Cでは鍛造素材
6の断面積の減少率か低くなるため、軸線方向端部て外
周部分が延ばされる割合か減って、その中心部分に生ず
るひけ穴6dが極めて浅くなり、しかもひけ穴6dがそ
の捨てボス部6Cで止まってそこよりも奥の軸端部6a
の中心部分までは達しなくなる。During this cross roll forming, one end of the forged material 6 in the axial direction is formed by the circumferential groove 7b of the roll die 7.
As shown in FIGS. 1 and 2, a discarded boss portion 6C having a partially larger outer diameter is formed at a position further toward the end than the shaft end portion 6a, and in this discarded boss portion 6C, the forging material 6 is Since the reduction rate of the cross-sectional area is lower, the rate of elongation of the outer peripheral portion at the axial end portion is reduced, and the sink hole 6d formed in the center portion becomes extremely shallow, and moreover, the sink hole 6d stops at the discarded boss portion 6C. The shaft end 6a further back than that
It will not reach the center of the area.
従って、このクロスロール成形方法で予備成形を行って
第2図に示すように軸状とした鍛造素材6に型鍛造成形
を施して、第3図に示すようにクランクシャフト8を製
造し、第4図に示すようにそのクランクシャフト8の周
囲のパリ9を除去すれは、上記予備成形した鍛造素材6
の軸線方向端部に残っているひけ穴6dか極めて浅く、
しかも必ず捨てボス部6Cて止まるため、除去するパリ
9中に上記ひけ穴6dの全ての部分を容易に含ませるこ
とかできるので、第5図にも示すように、クランクシャ
フト8の一端部のクランクプーリ軸部8aの中心部分に
ひけ穴6dに起因する疵4bか残ることを確実に防止す
ることかできる。Therefore, the forged material 6, which has been preformed using this cross-roll forming method and made into a shaft shape as shown in FIG. 2, is die-forged to produce the crankshaft 8 as shown in FIG. As shown in Fig. 4, the forged material 6 that has been preformed is
The sink hole 6d remaining at the axial end of is extremely shallow.
Moreover, since it always stops at the discarded boss part 6C, all parts of the sink hole 6d can be easily included in the hole 9 to be removed. It is possible to reliably prevent the flaw 4b caused by the sink hole 6d from remaining in the central portion of the crank pulley shaft portion 8a.
以上、図示例に基づき説明したか、この発明は上述の例
に限定されるものでなく、例えは、クロスロール成形は
、移動方向へ延在する溝を有する一対の平板状のダイス
を用いて行っても良い。Although the present invention has been described above based on the illustrated examples, the present invention is not limited to the above-mentioned examples. You can go.
またこの発明は、上記例でのクランクシャフト以外の鍛
造製品、例えばカムシャフト等の鍛造時の鍛造素材の予
備成形にも適用することかできる。Further, the present invention can be applied to forged products other than the crankshaft in the above example, such as preforming of a forged material during forging such as a camshaft.
(発明の効果)
かくしてこの発明のクロスロール成形方法によれは、そ
れにより軸状に予備成形を行った鍛造素材の軸線方向端
部に残っているひけ穴か極めて浅く、しかも必ず捨てボ
ス部で止まるため、その鍛造素材に鍛造成形を施して製
品を製造しても1.その製品の周囲の除去するパリ中に
そのひけ穴の全ての部分を容易に含ませることができる
ので、鍛造製品の軸端部の中心部分にひけ穴に起因する
疵か残ることを確実に防止することかできる。(Effects of the Invention) Thus, the warpage caused by the cross roll forming method of the present invention is caused by the sink hole remaining at the axial end of the forged material that has been preformed into a shaft shape, or by the extremely shallow sink hole, and also by the waste boss part. Therefore, even if a product is manufactured by forging the forged material, 1. Since all parts of the sink hole can be easily included in the area to be removed around the product, it is possible to reliably prevent any flaws caused by the sink hole from remaining in the center of the shaft end of the forged product. I can do something.
第1図(a)〜(C)はこの発明のクロスロール成形方
法の一実施例における順次の工程をそれぞれ示す断面図
、
第2図は上記実施例の方法で成形した鍛造素材を一部断
面で示す斜視図、
第3図は上記実施例の方法で成形した鍛造素材から型鍛
造したクランクシャフトをパリ付きの状態で示す正面図
、
第4図はパリを除去した上記クランクシャフトを示す正
面図、
第5図は上記クランクシャフトを一部断面で示す斜視図
、
第6図(a)、 (b)は従来のクロスロール成形方
法におけるロールダイスを示す側面図および斜視図、
第7図(a)〜(c)は上記従来方法における順次の工
程をそれぞれ示す断面図、
第8図は上記従来方法で成形した鍛造素材を一部断面で
示す斜視図、
第9図は上記従来方法で成形した鍛造素材から型鍛造し
たクランクシャフトをパリ付きの状態で示す正面図、
第10図はパリを除去した上記クランクシャフトを示す
正面図、
第11図は上記クランクシャツI・を一部断面で示す斜
視図である。
6−鍛造素材 6a−・軸端部6cm−一一捨
てボス部 6d−・・ひけ穴7−ロールダイス
7b−・−・周方向溝第1図
第2図
6&
第6図
(a)
(b)
第4図
第5図
第7図
第8図
1ち
第1O図
第11図Figures 1 (a) to (C) are cross-sectional views showing the sequential steps in an embodiment of the cross-roll forming method of the present invention, and Figure 2 is a partial cross-section of a forged material formed by the method of the above embodiment. FIG. 3 is a front view showing the crankshaft die-forged from the forged material formed by the method of the above embodiment with a burr attached, and FIG. 4 is a front view showing the crankshaft with the burr removed. , FIG. 5 is a perspective view partially showing the crankshaft in cross section, FIGS. 6(a) and (b) are a side view and a perspective view showing a roll die in the conventional cross roll forming method, and FIG. 7(a) ) to (c) are cross-sectional views showing the sequential steps in the above conventional method, Fig. 8 is a perspective view partially showing a cross section of the forged material formed by the above conventional method, and Fig. 9 is a cross-sectional view showing the forged material formed by the above conventional method. FIG. 10 is a front view showing the crankshaft die-forged from a forged material with a burr, FIG. 10 is a front view of the crankshaft with the burr removed, and FIG. 11 is a perspective view showing a partial cross section of the crank shirt I. It is a diagram. 6-Forged material 6a-・Shaft end 6cm-11 Discarded boss portion 6d-・Sink hole 7-Roll die
7b--... Circumferential grooves Fig. 1 Fig. 2 Fig. 6 & Fig. 6 (a) (b) Fig. 4 Fig. 5 Fig. 7 Fig. 8 Fig. 1 - Fig. 1O Fig. 11
Claims (1)
互いに反対方向へ移動させることにより前記素材を軸状
に延ばすクロスロール成形を行うに際し、 前記素材の軸線方向端部に、外径が部分的に大きい捨て
ボス部を形成することを特徴とする、クロスロール成形
方法。[Claims] 1. When performing cross roll forming in which the material is sandwiched between a pair of dies and the surfaces of the dies are moved in opposite directions to extend the material axially, the axial end portion of the material is A cross roll forming method characterized by forming a discarded boss portion having a partially large outer diameter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2155475A JP2588296B2 (en) | 1990-06-15 | 1990-06-15 | Cross roll forming method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2155475A JP2588296B2 (en) | 1990-06-15 | 1990-06-15 | Cross roll forming method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0452040A true JPH0452040A (en) | 1992-02-20 |
JP2588296B2 JP2588296B2 (en) | 1997-03-05 |
Family
ID=15606863
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2155475A Expired - Fee Related JP2588296B2 (en) | 1990-06-15 | 1990-06-15 | Cross roll forming method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2588296B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6111698A (en) * | 1984-06-27 | 1986-01-20 | 三菱重工業株式会社 | Nuclear reactor |
-
1990
- 1990-06-15 JP JP2155475A patent/JP2588296B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6111698A (en) * | 1984-06-27 | 1986-01-20 | 三菱重工業株式会社 | Nuclear reactor |
Also Published As
Publication number | Publication date |
---|---|
JP2588296B2 (en) | 1997-03-05 |
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