JPH11226690A - Combination of form rolling tool, and form rolling tool - Google Patents

Combination of form rolling tool, and form rolling tool

Info

Publication number
JPH11226690A
JPH11226690A JP3284698A JP3284698A JPH11226690A JP H11226690 A JPH11226690 A JP H11226690A JP 3284698 A JP3284698 A JP 3284698A JP 3284698 A JP3284698 A JP 3284698A JP H11226690 A JPH11226690 A JP H11226690A
Authority
JP
Japan
Prior art keywords
rolling tool
tooth
rolling
tool
gear
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
Application number
JP3284698A
Other languages
Japanese (ja)
Inventor
Izuru Yamamoto
出 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP3284698A priority Critical patent/JPH11226690A/en
Publication of JPH11226690A publication Critical patent/JPH11226690A/en
Pending legal-status Critical Current

Links

Landscapes

  • Gear Processing (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide combination of form rolling tools favorable in suppressing trace of tooth space left behind as dents in a form rolling gear, and the form rolling tools. SOLUTION: A first form rolling tool 1 of gear shape in which a plurality of first gear-like projections 2 are arranged in a row in the circumferential direction is combined with a second form rolling tool 4 of gear shape in which a plurality of second gear-like projections 5 are arranged in a row in the circumference direction. A tooth crest 52 of the second gear-like projections 5 of the second form rolling tool 4 is retracted from a tooth crest 22 of the first gear-like projections 2 of the first from rolling tool in the centripetal direction, and is provided with a recessed area E. During the machining, the first form rolling tool is abutted on a work F, while the second form rolling tool 4 having the recessed area E is not abutted thereon.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は転造歯車を成形する
転造工具の組合わせ及び転造工具に関する。The present invention relates to a combination of a rolling tool for forming a rolling gear and a rolling tool.

【０００２】[0002]

【従来の技術】従来より転造では図１０に示すように、
複数の第１歯状突起１２０が周方向に列設された歯車状
の第１転造工具１００と、複数の第２歯状突起４２０が
周方向に列設された第２転造工具４００との組合わせが
使用されている。そして２個１組の第１転造工具１００
及び第２転造工具４００の間に、円盤状の対象物Ｆを配
置させる。その状態で第１転造工具１００及び第２転造
工具４００を同期回転させつつ、互いに接近する方向に
同期移動させる。これにより対象物Ｆの外周部に複数の
歯部を形成し、対象物を転造歯車とする。2. Description of the Related Art Conventionally, in rolling, as shown in FIG.
A gear-shaped first rolling tool 100 in which a plurality of first tooth-shaped protrusions 120 are arranged in a circumferential direction; a second rolling tool 400 in which a plurality of second tooth-shaped protrusions 420 are arranged in a circumferential direction; Are used. And a set of two first rolling tools 100
The disk-shaped object F is arranged between the second rolling tool 400 and the second rolling tool 400. In this state, the first rolling tool 100 and the second rolling tool 400 are synchronously rotated and synchronously moved in a direction approaching each other. Thus, a plurality of teeth are formed on the outer peripheral portion of the object F, and the object is a rolled gear.

【０００３】転造における初期段階では割切り処理が実
行される。即ち、第１転造工具１００の第１歯状突起１
２０及び第２転造工具４００の第２歯状突起４２０の双
方を対象物Ｆの外周部に当て、極く浅い溝跡である割切
り跡Ｈを周方向に沿って所定のピッチで複数個形成す
る。転造の進行につれて、割切り跡Ｈが次第に大きな溝
として拡開して転造歯車の歯溝となる。[0003] In the initial stage of rolling, a splitting process is performed. That is, the first tooth-like projection 1 of the first rolling tool 100
20 and the second tooth-shaped projection 420 of the second rolling tool 400 are applied to the outer peripheral portion of the object F, and a plurality of split marks H, which are extremely shallow groove marks, are formed at a predetermined pitch along the circumferential direction. Form. As the rolling progresses, the cleavage trace H gradually expands as a large groove to form a tooth groove of the rolled gear.

【０００４】転造の際には、対象物Ｆの周長と、転造工
具１００，４００の周長（歯状突起１２０,４２０の歯
先円の周長）とを対応させる方策が必要である。更に、
第１転造工具１００及び第２転造工具４００の周方向の
位相を対応させる方策が必要である。対応していれば、
第１転造工具１００の第１歯状突起１２０で形成した割
切り跡Ｈに、第２転造工具４００の第２歯状突起４２０
が係合する。同様に、第２転造工具４００の第２歯状突
起４２０で形成した割切り跡Ｈに、第１転造工具１００
の第１歯状突起１２０が係合する。At the time of rolling, it is necessary to take a measure to make the circumference of the object F correspond to the circumference of the rolling tools 100 and 400 (the circumference of the addendum circle of the tooth-shaped projections 120 and 420). is there. Furthermore,
It is necessary to take measures to make the circumferential phases of the first rolling tool 100 and the second rolling tool 400 correspond. If supported,
The second toothed projection 420 of the second rolling tool 400 is attached to the cleavage mark H formed by the first toothed projection 120 of the first rolling tool 100.
Engage. Similarly, the first rolling tool 100 is attached to the split marks H formed by the second tooth-shaped projections 420 of the second rolling tool 400.
Are engaged with each other.

【０００５】[0005]

【発明が解決しようとする課題】ところで前述した前者
の方策の達成は、比較的容易である。しかし後者の方策
の達成は、必ずしも容易ではない。即ち、第１転造工具
１００及び第２転造工具４００の周方向の位相を厳密に
対応させるのは、必ずしも容易ではなく、位相合わせに
はかなりの時間と労力を要する。第１転造工具１００の
回転駆動軸、第２転造工具４００の回転駆動軸の回転剛
性の微少な相違の影響を受ける等のためである。従って
実際の操業では、両者の位相が若干ずれて転造成形され
るような場合もある。However, it is relatively easy to achieve the former measure. However, achieving the latter approach is not always easy. That is, it is not always easy to make the circumferential phases of the first rolling tool 100 and the second rolling tool 400 correspond exactly, and it takes considerable time and effort to adjust the phases. This is because the rotation drive shaft of the first rolling tool 100 and the rotation drive shaft of the second rolling tool 400 are affected by a slight difference in rotational rigidity. Therefore, in an actual operation, there may be a case where the two are roll-formed with slightly shifted phases.

【０００６】この場合には、第１転造工具１００で割切
り跡Ｈを形成するほかに、第２転造工具４００でも割切
り跡Ｈを形成することになる。この結果、割切り跡Ｈの
数が予想外に増加し、割切り不良が生じてしまう。割切
り跡Ｈの数が仮に増加したとしても、割切り跡Ｈの溝が
拡開して溝深さがある程度深くなれば、拡開した割切り
跡Ｈに転造工具１００，４００の歯状突起１２０，４２
０がなじむため、前記した位相ずれ量が小さければ、転
造成形は可能である。In this case, in addition to forming the cutting trace H with the first rolling tool 100, the cutting trace H is also formed with the second rolling tool 400. As a result, the number of the cleavage traces H unexpectedly increases, resulting in a defective cleavage. Even if the number of the cut marks H is increased, if the groove of the cut mark H is expanded and the groove depth is increased to some extent, the tooth shape of the rolling tools 100 and 400 is added to the expanded cut mark H. Protrusions 120, 42
Since 0 is compatible, roll forming is possible if the phase shift amount is small.

【０００７】しかしながらこの場合には、転造が終了し
た製品である転造歯車の歯先面において、歯溝とならな
かった割切り跡Ｈが打痕傷として残留し易い。従って転
造歯車の高品質化には好ましくない。本発明は上記した
実情に鑑みなされたものであり、割切り跡が転造歯車に
打痕傷として残留することを抑えるのに有利な転造工具
の組合わせ及び転造工具を提供することを課題とする。[0007] In this case, however, the cut marks H, which did not form the tooth grooves, are likely to remain as dent scratches on the tooth apex surface of the rolled gear, which is a rolled product. Therefore, it is not preferable for improving the quality of the rolled gear. The present invention has been made in view of the above-described circumstances, and provides a combination of a rolling tool and a rolling tool that are advantageous for suppressing a cut mark from remaining as a dent scratch on a rolled gear. Make it an issue.

【０００８】[0008]

【課題を解決するための手段】本発明者は上記した問題
について鋭意開発を進めた。そして転造初期において、
２個一組の転造工具の双方で割切り跡を形成する方式を
廃止し、２個一組の転造工具のうち、一方の転造工具だ
けの歯状突起で、割切り跡を形成するとともに、その割
切り跡の深さがある程度の深さとなるまで拡開させる。
このようにすれば、一組の転造工具の周方向の位相が若
干ずれている場合であっても、割切り跡の数の予想外の
増加を抑止できる。そしてその後に、２個一組の転造工
具の双方で転造成形するようにすれば、割切り跡が転造
歯車に残留するといった上記した不具合を解決するのに
有利であることを、本発明者は知見し請求項１の発明を
完成した。Means for Solving the Problems The present inventor has intensively developed the above-mentioned problem. And at the beginning of rolling,
Abolished the method of forming split marks with both sets of rolling tools, and formed split marks with tooth-shaped projections of only one of the two rolling tools. At the same time, expand the cleaving marks until the depth reaches a certain depth.
In this way, an unexpected increase in the number of split marks can be suppressed even when a set of rolling tools is slightly out of phase in the circumferential direction. After that, it was found that it would be advantageous to solve the above-mentioned problem that the cut marks remained on the rolled gear if the roll forming was performed with both the pair of rolling tools. The inventor has found that the invention of claim 1 has been completed.

【０００９】また、２個一組の転造工具の全部の歯状突
起で割切り跡を形成する方式を廃止し、転造工具のうち
の１個おきの歯状突起だけで、割切り跡を形成するとと
もに、その割切り跡の深さがある程度の深さとなるまで
拡開させる。このようにすれば、一組の転造工具の周方
向の位相が若干ずれている場合であっても、割切り跡の
数の予想外の増加を抑止できる。その後に、２個一組の
転造工具の双方で転造成形するようにすれば、割切り跡
が転造歯車に残留するといった上記した不具合を解決す
るのに有利であることを、本発明者は知見し請求項２の
発明を完成した。Further, the method of forming a split mark with all the tooth-shaped projections of a set of two rolling tools is abolished, and the split mark is formed only by every other tooth-shaped protrusion of the rolling tool. Is formed, and is expanded until the depth of the cleavage mark reaches a certain depth. In this way, an unexpected increase in the number of split marks can be suppressed even when a set of rolling tools is slightly out of phase in the circumferential direction. After that, if the rolling forming is performed by both the pair of rolling tools, it is advantageous to solve the above-mentioned problem that the cut marks remain on the rolled gear. The inventor found that the invention of claim 2 was completed.

【００１０】即ち、請求項１に係る転造工具の組合わせ
は、複数の第１歯状突起が周方向に列設された歯車状の
第１転造工具と、複数の第２歯状突起が周方向に列設さ
れ前記第１転造工具とともに対象物を転造する歯車状の
第２転造工具との組合わせであって、第２転造工具の第
２歯状突起の歯先面は、第１転造工具の第１歯状突起の
歯先面よりも求心方向に退避していることを特徴とする
ものである。In other words, the combination of the rolling tool according to the first aspect is a gear-shaped first rolling tool in which a plurality of first tooth-shaped projections are arranged in the circumferential direction, and a plurality of second tooth-shaped projections. Is a combination with a gear-shaped second rolling tool for rolling an object together with the first rolling tool, which is arranged in the circumferential direction, wherein the tip of the second tooth-shaped projection of the second rolling tool is provided. The surface is retracted in the centripetal direction from the tip surface of the first tooth-shaped projection of the first rolling tool.

【００１１】請求項２に係る転造工具は、複数の歯状突
起が周方向に列設された歯車状の転造工具であって、一
個おきの歯状突起の歯先面は、隣設する他の歯状突起の
歯先面よりも求心方向に退避していることを特徴とする
ものである。The rolling tool according to claim 2 is a gear-shaped rolling tool in which a plurality of tooth-shaped projections are arranged in a circumferential direction, and the tooth tip surfaces of every other tooth-shaped projection are adjacently provided. The other tooth-like projections are retracted in the centripetal direction from the tooth tip surfaces of the other tooth-like projections.

【００１２】[0012]

【発明の実施の形態】各請求項に係る転造工具の歯状突
起は、平歯車状でも良いし、場合によっては、はすば歯
車状でも良い。各請求項に係る転造工具は、一般的に
は、熱間転造に使用されるものであるが、場合によって
は、温間転造や冷間転造に使用されるものでも良い。転
造工具の諸言、歯状突起のピッチ等は適宜選択できる。BEST MODE FOR CARRYING OUT THE INVENTION The tooth-shaped projection of the rolling tool according to each claim may be in the form of a spur gear or, in some cases, in the form of a helical gear. The rolling tool according to each claim is generally used for hot rolling, but may be used for warm rolling or cold rolling in some cases. The terms of the rolling tool, the pitch of the tooth-like projections, and the like can be appropriately selected.

【００１３】請求項１では、第２転造工具の第２歯状突
起の歯先面は、第１転造工具の第１歯状突起の歯先面よ
りも求心方向に退避している。退避している量として
は、転造工具のサイズ、製品である転造歯車のサイズな
どに応じて適宜変更されるが、例えば、退避している量
の上限値としては例えば０．５ｍｍ程度,０．８ｍｍ程
度,１．０ｍｍ程度,１．５ｍｍ程度、２ｍｍ程度にでき
る。下限値としては例えば０．０１ｍｍ程度,０．０５
ｍｍ程度、０．１ｍｍ程度,０．２ｍｍ程度,０．４ｍｍ
程度にできる。ただし上記数値に限定されるものではな
い。In the first aspect, the tip surface of the second tooth-shaped projection of the second rolling tool is retracted in the centripetal direction from the tooth tip surface of the first tooth-shaped projection of the first rolling tool. The retracted amount is appropriately changed according to the size of a rolling tool, the size of a rolling gear as a product, and the like. For example, the upper limit of the retracted amount is, for example, about 0.5 mm, It can be about 0.8 mm, about 1.0 mm, about 1.5 mm, and about 2 mm. As the lower limit, for example, about 0.01 mm, 0.05
mm, 0.1mm, 0.2mm, 0.4mm
Can be about. However, it is not limited to the above numerical values.

【００１４】請求項２では、複数の歯状突起が周方向に
列設された歯車状の転造工具のうち、一個おきの歯状突
起の歯先面は、隣設する他の歯状突起の歯先面よりも求
心方向に退避している。退避している量としては、転造
工具のサイズ、製品である転造歯車のサイズなどに応じ
て適宜変更されるが、例えば、上記した数値と同様な数
値として選択できる。According to a second aspect of the present invention, in a gear-shaped rolling tool in which a plurality of tooth-shaped protrusions are arranged in the circumferential direction, the tooth tip surface of every other tooth-shaped protrusion is adjacent to another tooth-shaped protrusion. Are retracted in the centripetal direction from the tooth tip surface. The retracted amount is appropriately changed according to the size of a rolling tool, the size of a rolling gear as a product, and the like, but can be selected, for example, as a numerical value similar to the above numerical value.

【００１５】なお転造工具の材質は一般的には鋼系、合
金鋼系などを採用できる。対象物の材質は鉄系が一般的
であるが、アルミ系等の他の金属でも良い。Generally, a steel-based or alloy steel-based material can be used as the material of the rolling tool. The material of the object is generally iron-based, but may be other metals such as aluminum.

【００１６】[0016]

【実施例】（第１実施例） （第１実施例の構成）第１実施例を図１〜図５を参照し
て説明する。図１は熱間転造の初期における割切りを示
す。図１に示すように、本実施例では、複数（偶数個で
も奇数個でもよいが、本実施例では偶数個）の第１歯状
突起２が周方向に所定のピッチで列設された歯車状の金
属製の第１転造工具１と、複数（偶数個でも奇数個でも
よいが、本実施例では偶数個）の第２歯状突起５が周方
向に所定のピッチで列設された金属製の第２転造工具４
との組合わせが使用される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) (Configuration of First Embodiment) A first embodiment will be described with reference to FIGS. FIG. 1 shows the splitting at the beginning of hot rolling. As shown in FIG. 1, in the present embodiment, a gear in which a plurality of (even or odd number, in the present embodiment, even number) first tooth-shaped projections 2 are arranged at a predetermined pitch in the circumferential direction. A first rolling tool 1 made of a metal and a plurality of (even number or odd number, but in this embodiment, even number) second tooth-like projections 5 are arranged in a row at a predetermined pitch in the circumferential direction. Second metal rolling tool 4
Is used.

【００１７】第１転造工具１及び第２転造工具４は、押
し込み同期装置６に接続されている。押し込み同期装置
６は油圧シリンダまたは駆動モータをもち、第１転造工
具１及び第２転造工具４を対象物Ｆに向けて押し込む機
能をもつ。押し込み同期装置６が駆動すると、第１転造
工具１は矢印Ｕ１方向に移動するとともに、第２転造工
具４は矢印Ｕ２方向に同期して移動する。The first rolling tool 1 and the second rolling tool 4 are connected to a push-in synchronizer 6. The push-in synchronizer 6 has a hydraulic cylinder or a drive motor, and has a function of pushing the first rolling tool 1 and the second rolling tool 4 toward the object F. When the push-in synchronizer 6 is driven, the first rolling tool 1 moves in the direction of the arrow U1, and the second rolling tool 4 moves in synchronization with the direction of the arrow U2.

【００１８】図２は、第１転造工具１の第１歯状突起２
を拡大して示す。図２に示すように、第１転造工具１の
第１歯状突起２は、互いに背向する一組の第１かみ合い
面２０と、第１かみ合い面２０の内端をつなぐ第１歯底
面２１と、第１かみ合い面２０の外端をつなぐ第１歯先
面２２とを備えている。第１かみ合い面２０はインボリ
ュート曲線で規定されている。第１歯状突起２は、第１
転造工具１の中心軸芯を通る中心線Ｐ１を備えている。FIG. 2 shows the first tooth-shaped projection 2 of the first rolling tool 1.
Is shown enlarged. As shown in FIG. 2, the first tooth-shaped projections 2 of the first rolling tool 1 are provided with a pair of first engagement surfaces 20 facing each other and a first tooth bottom surface connecting the inner ends of the first engagement surfaces 20. 21 and a first tooth tip surface 22 that connects the outer end of the first meshing surface 20. The first meshing surface 20 is defined by an involute curve. The first tooth-shaped projection 2 is formed by a first
A center line P1 passing through the center axis of the rolling tool 1 is provided.

【００１９】第１歯状突起２の第１歯先面２２は、第１
歯状突起２の中心線Ｐ１上の仮想点Ｋ１を中心とする半
径Ｒをもつ円弧ＲＡに基づいて規定されている。円弧Ｒ
Ａは、第１歯先面２２の頂点２２Ｋの歯先円と、一対の
第１かみ合い面２０，２０とに交差するように規定され
ている。なお表１は第１転造工具１の諸元を示す。表１
において、大径は第１歯先面２２の頂点２２ｋの外径を
意味する。小径は第１歯底面２１の外径を意味する。The first tooth tip surface 22 of the first tooth-shaped projection 2 is
It is defined based on an arc RA having a radius R centered on a virtual point K1 on the center line P1 of the tooth-shaped projection 2. Arc R
A is defined so as to intersect the tip circle at the vertex 22K of the first tip surface 22 and the pair of first meshing surfaces 20, 20. Table 1 shows the specifications of the first rolling tool 1. Table 1
, The larger diameter means the outer diameter of the vertex 22k of the first tooth tip surface 22. The small diameter means the outer diameter of the first tooth bottom 21.

【００２０】[0020]

【表１】 図３は、相手側の第２転造工具４の第２歯状突起５を拡
大して示す。第２転造工具４は、第１転造工具１ととも
に２個一組を構成するものである。第２転造工具４は、
後述する第２歯先面５２の欠損領域Ｅに相当する部分を
のぞいて、第１転造工具１と同様な形状、諸言をもつ。[Table 1] FIG. 3 shows an enlarged view of the second tooth-like projection 5 of the second rolling tool 4 on the mating side. The second rolling tool 4 constitutes a set of two together with the first rolling tool 1. The second rolling tool 4 is
Except for a portion corresponding to a defective region E of a second tooth tip surface 52 described later, the second tooth tip surface 52 has the same shape and specifications as the first rolling tool 1.

【００２１】第２転造工具４の第２歯状突起５は、図３
に示すように、互いに背向する一対の第２かみ合い面５
０と、第２かみ合い面５０の内端をつなぐ第２歯底面５
１と、第２かみ合い面５０の外端をつなぐ第２歯先面５
２とを備えている。第２かみ合い面５０は、第１かみ合
い面２０と同様なインボリュート曲線で規定されてい
る。第２転造工具４の第２歯底面５１は、第１転造工具
１の第１歯底面２１と同一の形態である。The second toothed projection 5 of the second rolling tool 4 is shown in FIG.
As shown in the figure, a pair of second mating surfaces 5
0 and the second tooth root 5 connecting the inner end of the second meshing surface 50
1 and a second tooth tip surface 5 connecting the outer end of the second meshing surface 50
2 is provided. The second meshing surface 50 is defined by an involute curve similar to the first meshing surface 20. The second root surface 51 of the second rolling tool 4 has the same form as the first root surface 21 of the first rolling tool 1.

【００２２】第２歯状突起５は第２転造工具４の中心軸
芯を通る中心線Ｐ２を備えている。第２歯状突起５の第
２歯先面５２は、中心線Ｐ２上の仮想点Ｋ２を中心とす
る半径Ｒ３をもつ円弧ＲＢに基づいて規定されている。
円弧ＲＢと第２かみ合い面５０との境界ＭＡは、滑らか
に連接されている。仮想点Ｋ２は、中心線Ｐ２におい
て、仮想点Ｋ１よりも求心方向つまり矢印Ｓ１方向に位
置している。従って、第２転造工具４の第２歯状突起５
の第２歯先面５２は、第１転造工具１の第１歯状突起２
の第１歯先面２２よりも求心方向つまり矢印Ｓ１方向に
退避している。中心線Ｐ２上において、退避している量
Ｍは０．５ｍｍ程度とされている。The second tooth-shaped projection 5 has a center line P2 passing through the center axis of the second rolling tool 4. The second tooth top surface 52 of the second tooth-shaped projection 5 is defined based on an arc RB having a radius R3 centered on a virtual point K2 on the center line P2.
The boundary MA between the arc RB and the second meshing surface 50 is smoothly connected. The virtual point K2 is located on the center line P2 in the centripetal direction, that is, the direction of the arrow S1 than the virtual point K1. Therefore, the second tooth-shaped projection 5 of the second rolling tool 4
Of the first toothed surface 2 of the first rolling tool 1
Are retracted in the centripetal direction, that is, in the direction of arrow S1 from the first tooth tip surface 22 of FIG. On the center line P2, the retracted amount M is about 0.5 mm.

【００２３】換言すれば、第２転造工具４の第２歯状突
起５においては、図３から理解できるように、仮想線の
円弧ＲＡで規定された第１歯先面２２と、実線の円弧Ｒ
Ｂで規定された第２歯先面５２との間の領域は、欠損領
域Ｅとされている。故に、歯先径を比較すると、欠損領
域Ｅをもつ第２工具４の第２歯先面５２の歯先径は、欠
損領域Ｅをもたない転造工具１の第１歯先面２２の歯先
径よりも小さい。In other words, as can be understood from FIG. 3, the first tooth tip surface 22 defined by the imaginary line arc RA and the solid tooth line Arc R
A region between the second tooth tip surface 52 defined by B is a defect region E. Therefore, when the tip diameter is compared, the tip diameter of the second tip surface 52 of the second tool 4 having the missing area E is smaller than that of the first tip surface 22 of the rolling tool 1 having no missing area E. Smaller than tip diameter.

【００２４】図１に示す第２転造工具４において、欠損
領域Ｅは、黒く塗りつぶして模式的に示されている。従
って第２転造工具４のうち全部の第２歯状突起５は、そ
の歯先部分に欠損領域Ｅを備えている。転造の際には従
来技術の転造と同様に、第１転造工具１及び第２転造工
具４の周長に対応した周長をもつ円盤状をなす鋼系の対
象物Ｆ（材質：鋼系）を用いる。そして、その対象物Ｆ
を第１転造工具１と第２転造工具４との間に配置する。
誘導加熱等により、対象物Ｆの外周部は熱間状態とされ
ている。転造前の対象物Ｆの外周部には、溝などは形成
されていない。In the second rolling tool 4 shown in FIG. 1, the defective area E is schematically shown by blacking out. Therefore, all the second tooth-shaped projections 5 of the second rolling tool 4 have a defective area E at the tooth tip portion. At the time of rolling, as in the case of the prior art rolling, a disk-shaped steel-based object F (material) having a circumferential length corresponding to the circumferential length of the first rolling tool 1 and the second rolling tool 4 is used. : Steel). And the object F
Is disposed between the first rolling tool 1 and the second rolling tool 4.
By the induction heating or the like, the outer peripheral portion of the object F is in a hot state. No groove or the like is formed on the outer peripheral portion of the object F before rolling.

【００２５】上記したように対象物Ｆを第１転造工具１
と第２転造工具４との間に配置した状態で、第１転造工
具１を矢印Ｗ１方向に回転させるとともに第２転造工具
４を矢印Ｗ２方向に回転させ、且つ、対象物Ｆを矢印Ｗ
３方向に回線させつつ、第１転造工具１及び第２転造工
具４を互いに接近する方向（矢印Ｕ１，Ｕ２方向）に同
期させて少しずつ押し込む。これにより転造初期では割
切りが実行される。即ち、第１転造工具１の第１歯状突
起２が対象物Ｆの外周部に当たり、極く浅い溝である割
切り跡Ｈが対象物Ｆの外周部に周方向に沿って所定のピ
ッチＰＡで複数個形成される。As described above, the object F is moved to the first rolling tool 1
While the first rolling tool 1 is rotated in the direction of the arrow W1 while the second rolling tool 4 is rotated in the direction of the arrow W2 in a state where the object F is arranged between the first rolling tool 1 and the second rolling tool 4, Arrow W
The first rolling tool 1 and the second rolling tool 4 are pushed in little by little while synchronizing with each other in the directions approaching each other (directions of arrows U1 and U2) while connecting in three directions. As a result, splitting is performed at the beginning of rolling. That is, the first tooth-shaped projection 2 of the first rolling tool 1 hits the outer peripheral portion of the object F, and the cleavage mark H, which is a very shallow groove, is formed on the outer peripheral portion of the object F at a predetermined pitch along the circumferential direction. A plurality of PAs are formed.

【００２６】このとき前述したように第２転造工具４の
第２歯先面５２は、求心方向つまり矢印Ｓ１方向に退避
しており、欠損領域Ｅが形成されているため、第２歯先
面５２は対象物Ｆの外周部に当たらない。従って、第１
転造工具１の第１歯状突起２で割切りが行われるもの
の、第２転造工具４の第２歯状突起５では割切りが行わ
れない。上記した割切り処理が終わるまで、第１転造工
具１及び第２転造工具４の押し込み量を実質的には増加
させない。割切り跡Ｈの深さが深くなるように、割切り
跡Ｈの溝が次第に拡開する。At this time, as described above, the second tooth tip surface 52 of the second rolling tool 4 is retracted in the centripetal direction, that is, the direction of the arrow S1, and the defective area E is formed. The surface 52 does not hit the outer peripheral portion of the object F. Therefore, the first
Although splitting is performed at the first toothed projection 2 of the rolling tool 1, splitting is not performed at the second toothed projection 5 of the second rolling tool 4. Until the above-described cleaving process is completed, the pushing amounts of the first and second rolling tools 1 and 4 are not substantially increased. The groove of the cleavage mark H gradually expands so that the depth of the cleavage mark H becomes deeper.

【００２７】上記したように割切り跡Ｈの溝深さがある
程度深くなったら、矢印Ｕ１，Ｕ２方向への第１転造工
具１及び第２転造工具４の押し込み操作を再開して、押
し込み量を少しずつ増加させる。これにより第１転造工
具１と第２転造工具４との双方で、対象物Ｆの外周部に
成形が実行され、対象物Ｆの外周部には複数個の歯部が
周方向に沿って成形される。As described above, when the groove depth of the cleavage trace H becomes somewhat deep, the pushing operation of the first rolling tool 1 and the second rolling tool 4 in the directions of arrows U1 and U2 is resumed, and the pushing is continued. Increase the amount little by little. As a result, both the first rolling tool 1 and the second rolling tool 4 form the outer peripheral portion of the object F, and a plurality of teeth are formed on the outer peripheral portion of the object F along the circumferential direction. Molded.

【００２８】このように割切り跡Ｈの溝がいったん拡開
すれば、第１転造工具１と第２転造工具４との周方向の
位相が必ずしも厳密には対応していない場合であって
も、拡開した割切り跡Ｈに、第１転造工具１の第１歯状
突起２、第２転造工具４の第２歯状突起５がなじんで良
好に係合できるため、成形が良好に進行できる。成形後
に、寸法調整などを主眼とするサイジング処理を所定時
間（例えば５〜３０秒間）行なう。この場合には、第１
転造工具１、第２転造工具４、対象物Ｆを回転させつ
つ、第１転造工具１及び第２転造工具４の押し込み量を
増加させずに維持する。Once the groove of the cutting trace H is thus widened, the circumferential phases of the first rolling tool 1 and the second rolling tool 4 do not always correspond exactly. However, since the first tooth-shaped projection 2 of the first rolling tool 1 and the second tooth-shaped projection 5 of the second rolling tool 4 can be well engaged with the enlarged cleavage mark H, the molding can be performed. Can proceed favorably. After the molding, a sizing process mainly for dimensional adjustment is performed for a predetermined time (for example, 5 to 30 seconds). In this case, the first
While rotating the rolling tool 1, the second rolling tool 4, and the object F, the pushing amount of the first rolling tool 1 and the second rolling tool 4 is maintained without increasing.

【００２９】図４は、転造の際における第１転造工具１
及び第２転造工具４の押し込み量の変化の一例を示す。
この例では図４に示すように、まず押し込み量が０．４
ｍｍとなるまで押し込みを進める。その位置で時刻Ｔ３
まで保持する。その間に割切り跡が拡開する。時刻Ｔ３
が経過したら、押し込み操作を再開する。時刻Ｔ４を越
えたら、その位置で維持する。これにより寸法調整を狙
ったサイジング処理が実行される。その後、第１転造工
具１及び第２転造工具４を互いに離間させる。FIG. 4 shows the first rolling tool 1 during rolling.
And an example of a change in the amount of pushing of the second rolling tool 4 is shown.
In this example, as shown in FIG.
Push in until it reaches mm. Time T3 at that position
Hold up to In the meantime, the cleavage marks spread. Time T3
When elapses, the pushing operation is restarted. After the time T4, the position is maintained. As a result, a sizing process for adjusting the dimensions is performed. Thereafter, the first rolling tool 1 and the second rolling tool 4 are separated from each other.

【００３０】図５は、熱間転造後の製品である転造歯車
Ｆ３の一部を示す。歯部Ｆ４は、互いに背向する一組の
噛合面Ｆ５と、歯底面Ｆ６と、歯先面Ｆ７をもつ。 （第１実施例の効果）以上説明したように本実施例によ
れば、第２転造工具４の各第２歯状突起５の第２歯先面
５２は求心方向つまり矢印Ｓ１方向に退避し、欠損領域
Ｅを備えている。従って転造初期では、欠損領域Ｅをも
たないノーマルな第１転造工具１の第１歯状突起２で割
切りが行われるものの、欠損領域Ｅをもつ第２転造工具
４の第２歯状突起５では割切りが行われない。そのため
従来と同様に対象物Ｆの周長と転造工具１，２の周長
（歯状突起２，５の歯先円の周長）とを対応させておけ
ば、第１転造工具１と第２転造工具４との周方向の位相
が若干ずれている場合であっても、従来技術とは異な
り、割切り跡の数の予想外の増加を抑えることができ、
割切り不良を抑えることができる。故に、製品である転
造歯車Ｆ３の歯先面Ｆ７において割切り跡Ｈが打痕傷と
して残る問題を抑えるのに有利である。FIG. 5 shows a part of a rolled gear F3 which is a product after hot rolling. The tooth portion F4 has a pair of meshing surfaces F5 facing each other, a tooth bottom surface F6, and a tooth tip surface F7. (Effects of the First Embodiment) As described above, according to the present embodiment, the second tooth top surface 52 of each second tooth-like projection 5 of the second rolling tool 4 is retracted in the centripetal direction, that is, the direction of the arrow S1. And a defective region E is provided. Therefore, in the initial stage of rolling, the first tooth-shaped projection 2 of the normal first rolling tool 1 having no defective area E is cut off, but the second rolling tool 4 of the second rolling tool 4 having the defective area E is cut off. No splitting is performed on the tooth-like projections 5. Therefore, if the circumferential length of the object F and the circumferential length of the rolling tools 1 and 2 (the circumferential length of the addendum circle of the tooth-like projections 2 and 5) are made to correspond to each other as in the conventional case, the first rolling tool 1 Even if the phase in the circumferential direction of the second rolling tool 4 is slightly different from that of the second rolling tool 4, unlike the related art, an unexpected increase in the number of split marks can be suppressed,
Bad splitting can be suppressed. Therefore, it is advantageous to suppress the problem that the cut marks H remain as dent scratches on the tooth tip surface F7 of the product rolled gear F3.

【００３１】また欠損流域Ｅを形成することによって第
２転造工具４に割切り機能をもたせてない本実施例で
は、第１転造工具１と第２転造工具４とを同期させて押
し込む機能をもつ押し込み同期装置６としては、従来と
同様の既存設備をそのまま利用することができる。よっ
て、設備費の高騰を防止できる利点が得られる。ところ
で製品である転造歯車Ｆ３のうち、精度が最も要請され
るのは歯部Ｆ４の噛合面Ｆ５である。噛合面Ｆ５は、相
手歯車と噛合するピッチ円をもつからである。この噛合
面Ｆ５は、従来と同様のインボリュート曲線で規定され
た第１転造工具１の第１かみ合い面２０及び第２転造工
具４の第２かみ合い面５０で成形される。従って転造歯
車Ｆ３の噛合面Ｆ５の精度は確保される。Further, in this embodiment in which the second rolling tool 4 is not provided with the splitting function by forming the missing basin E, the first rolling tool 1 and the second rolling tool 4 are pressed in synchronism. As the push-in synchronizer 6 having a function, existing equipment similar to the conventional one can be used as it is. Therefore, an advantage that a rise in equipment costs can be prevented can be obtained. By the way, among the rolled gears F3 which are products, the most required accuracy is the meshing surface F5 of the tooth portion F4. This is because the meshing surface F5 has a pitch circle that meshes with the mating gear. The meshing surface F5 is formed by the first meshing surface 20 of the first rolling tool 1 and the second meshing surface 50 of the second rolling tool 4, which are defined by the same involute curve as in the related art. Therefore, the accuracy of the meshing surface F5 of the rolling gear F3 is ensured.

【００３２】更に、転造歯車Ｆ３の歯底面Ｆ６は、欠損
領域Ｅをもたないノーマルな第１転造工具１の第１歯状
突起２の第１歯先面２２によって成形される。しかも転
造歯車Ｆ３の歯底面Ｆ６は、ピッチ円をもつ噛合面Ｆ５
ほどの厳しい精度が要請されない。そのため本実施例で
は第２転造工具４に欠損領域Ｅが設けられているにもか
かわらず、転造歯車Ｆ３の歯底面Ｆ６の精度も、実用上
支障のないように確保される。しかも本実施例では成形
後にサイジング処理を行うため、転造歯車Ｆ３の歯底面
Ｆ６の精度はなおさら確保される。Further, the tooth bottom surface F6 of the rolling gear F3 is formed by the first tooth tip surface 22 of the first tooth-like projection 2 of the normal first rolling tool 1 having no defective area E. In addition, the tooth bottom surface F6 of the rolled gear F3 has a meshing surface F5 having a pitch circle.
Not as strict accuracy is required. Therefore, in the present embodiment, the accuracy of the tooth bottom surface F6 of the rolled gear F3 is ensured without practically hindering the fact that the second rolling tool 4 is provided with the defective area E. Moreover, in this embodiment, since the sizing process is performed after the molding, the accuracy of the tooth bottom surface F6 of the rolled gear F3 is further ensured.

【００３３】加えて本実施例では、欠損領域Ｅをもたな
い第１転造工具１の第１歯状突起２の先端が摩耗したと
きには、その先端を再整形して、欠損領域Ｅをもつ第２
転造工具４として再利用することも期待できる。よって
第１転造工具１のリサイクル性が高まる。 （実施例２） （第２実施例の構成）本発明の第２実施例を図６〜図８
に示す。この例においても、複数の歯状突起が周方向に
所定のピッチで列設された歯車状の２個一組の第３転造
工具７が使用される。In addition, in this embodiment, when the tip of the first tooth-shaped projection 2 of the first rolling tool 1 having no defect area E is worn, the tip is reshaped to have the defect area E. Second
It can also be expected to be reused as the rolling tool 4. Therefore, the recyclability of the first rolling tool 1 is improved. (Embodiment 2) (Configuration of second embodiment) FIGS. 6 to 8 show a second embodiment of the present invention.
Shown in Also in this example, a pair of gear-shaped third rolling tools 7 in which a plurality of tooth-shaped protrusions are arranged at a predetermined pitch in the circumferential direction are used.

【００３４】第３転造工具７は、周方向において一個お
きに設けられた第３歯状突起８と、第３歯状突起８に隣
設する第４歯状突起９とを備えている。第３転造工具７
は偶数歯のタイプであり、従って第３歯状突起８の数と
第４歯状突起９の数との和は偶数である。第３転造工具
７の諸言は、第３歯先面８２に相当する部分をのぞい
て、表１に示すものを採用している。The third rolling tool 7 has third toothed projections 8 provided every other in the circumferential direction, and fourth toothed projections 9 provided adjacent to the third toothed projections 8. Third rolling tool 7
Is an even tooth type, so that the sum of the number of the third teeth 8 and the number of the fourth teeth 9 is an even number. Except for the portion corresponding to the third tooth tip surface 82, those shown in Table 1 are adopted as the terms of the third rolling tool 7.

【００３５】図７は第３転造工具７のノーマルな第４歯
状突起９を拡大して示す。図７に示すように、この第４
歯状突起９は、互いに背向する一組の第４かみ合い面９
０と、第４かみ合い面９０の内端をつなぐ第４歯底面９
１と、第４かみ合い面９０の外端をつなぐ第４歯先面９
２とを備えている。第４かみ合い面９０はインボリュー
ト曲線で規定されている。第４歯状突起９は、第３転造
工具７の中心軸芯を通る中心線Ｐ４を備えている。第４
歯状突起９の第４歯先面９２は、第４歯状突起９の中心
線Ｐ４上の仮想点Ｋ４を中心とする半径Ｒをもつ円弧Ｒ
Ａに基づいて規定されている。FIG. 7 is an enlarged view of the normal fourth toothed projection 9 of the third rolling tool 7. As shown in FIG.
The teeth 9 are provided with a set of fourth mating surfaces 9 facing away from each other.
0 and the fourth tooth root 9 connecting the inner end of the fourth meshing surface 90
1 and a fourth tooth surface 9 connecting the outer end of the fourth meshing surface 90
2 is provided. The fourth meshing surface 90 is defined by an involute curve. The fourth tooth-shaped projection 9 has a center line P <b> 4 passing through the center axis of the third rolling tool 7. 4th
The fourth tooth tip surface 92 of the toothed projection 9 has an arc R having a radius R centered on a virtual point K4 on the center line P4 of the fourth toothed projection 9.
A is defined based on A.

【００３６】図８は第３歯状突起８を拡大して示す。第
３歯状突起８は、後述する第３歯先面８２に相当する部
分をのぞいて、第４歯状突起９と同様な形状をなす。こ
の第３歯状突起８は、図８に示すように、互いに背向す
る一組の第３かみ合い面８０と、第３かみ合い面８０の
内端をつなぐ第３歯底面８１と、第３かみ合い面８０の
外端をつなぐ第３歯先面８２とを備えている。第３かみ
合い面８０は、前記した第４かみ合い面９０と同様なイ
ンボリュート曲線で規定されている。第３歯状突起８は
第３転造工具７の中心軸芯を通る中心線Ｐ３を備えてい
る。第３歯状突起８の第３歯先面８２は、中心線Ｐ３上
の仮想点Ｋ３を中心とする半径Ｒ３をもつ円弧ＲＢに基
づいて規定されている。仮想点Ｋ３は、中心線Ｐ３にお
いて、仮想点Ｋ４よりも求心方向つまり矢印Ｓ１方向に
位置している。従って、第３転造工具７において、第３
歯状突起８の第３歯先面８２は、第４歯状突起９の第４
歯先面９２よりも求心方向つまり矢印Ｓ１方向に退避し
ている。中心線Ｐ３上において、退避している量Ｍは
０．５ｍｍｍｍ程度とされている。FIG. 8 shows the third tooth-shaped projection 8 in an enlarged manner. The third tooth-shaped projection 8 has the same shape as the fourth tooth-shaped projection 9 except for a portion corresponding to a third tooth tip surface 82 described later. As shown in FIG. 8, the third tooth-shaped projection 8 includes a pair of third engagement surfaces 80 facing each other, a third tooth bottom surface 81 connecting the inner ends of the third engagement surfaces 80, and a third engagement. A third tip surface 82 that connects the outer end of the surface 80. The third meshing surface 80 is defined by an involute curve similar to the fourth meshing surface 90 described above. The third toothed projection 8 has a center line P3 passing through the center axis of the third rolling tool 7. The third tooth tip surface 82 of the third tooth-shaped projection 8 is defined based on an arc RB having a radius R3 centered on a virtual point K3 on the center line P3. The virtual point K3 is located on the center line P3 in the centripetal direction, that is, the direction of the arrow S1 than the virtual point K4. Therefore, in the third rolling tool 7, the third
The third tooth tip surface 82 of the tooth-shaped projection 8 is
It retracts from the tooth tip surface 92 in the centripetal direction, that is, the direction of the arrow S1. On the center line P3, the retracted amount M is about 0.5 mmmm.

【００３７】換言すれば本実施例では、第３転造工具７
の第３歯状突起８においては、図８から理解できるよう
に、仮想線の円弧ＲＡで規定された第４歯先面９２と、
実線の円弧ＲＢで規定された第３歯先面８２との間の領
域は、欠損領域Ｅされている。従って歯先径を比較する
と、第３歯先面８２の歯先径は第４歯先面９２の歯先径
よりも小さくされている。In other words, in this embodiment, the third rolling tool 7
As can be understood from FIG. 8, the fourth tooth top surface 92 defined by the circular arc RA of the imaginary line
The region between the third tooth tip surface 82 defined by the solid arc RB is a missing region E. Therefore, comparing the tip diameters, the tip diameter of the third tip surface 82 is smaller than the tip diameter of the fourth tip surface 92.

【００３８】欠損領域Ｅは、図６に示す２個一組の第３
転造工具７において、黒く塗りつぶして模式的に示され
ている。従って第３転造工具７のうち、各第４歯状突起
９には欠損領域Ｅが形成されていないが、各第３歯状突
起８には欠損領域Ｅが形成されている。本実施例におい
ても、転造の際には、上記した第３転造工具７を２個一
組用いる。更に、第３転造工具７の周長に対応した周長
をもつ円盤状をなす鋼系の熱間状態の対象物Ｆ（材質：
鋼系）を用いる。対象物Ｆの外周部は、誘導加熱で熱間
状態とされている。その対象物Ｆを２個一組の第３転造
工具７の間に配置する。なお転造開始前には、対象物Ｆ
の外周部には溝などは形成されていない。The deficient region E is a pair of the third region shown in FIG.
The rolling tool 7 is schematically illustrated by being blacked out. Accordingly, in the third rolling tool 7, a defective area E is not formed in each fourth tooth-shaped projection 9, but a defective area E is formed in each third tooth-shaped projection 8. Also in this embodiment, at the time of rolling, a set of two third rolling tools 7 is used. Furthermore, a disk-shaped steel-based hot object F (a material: a material having a peripheral length corresponding to the peripheral length of the third rolling tool 7) (material:
Steel). The outer peripheral portion of the object F is in a hot state by induction heating. The object F is arranged between a pair of third rolling tools 7. Before starting the rolling, the object F
No groove or the like is formed in the outer peripheral portion of.

【００３９】図６に示すように、２個一組の第３転造工
具７が回転する際に、一方Ａの第３転造工具７の欠損領
域Ｅをもたない第４歯状突起９と、他方Ｂの第３転造工
具７の欠損領域Ｅをもつ第３歯状突起８とが仮想線ＺＡ
において互いに向き合うようにされている。また１ピッ
チぶんの回転に伴い、一方Ａの第３転造工具７の欠損領
域Ｅをもつ第３歯状突起８と、他方Ｂの第３転造工具７
の欠損領域Ｅをもたない第４歯状突起９とが互いに向き
合うようにされている。As shown in FIG. 6, when the set of two third rolling tools 7 rotates, the fourth tooth-shaped projection 9 having no defective area E of the third rolling tool 7 of A And the third toothed projection 8 having the missing area E of the third rolling tool 7 on the other side B is a virtual line ZA.
At each other. Further, with the rotation of one pitch, the third tooth-shaped projection 8 having the defective area E of the third rolling tool 7 on the one side A and the third rolling tool 7 on the other side B
And the fourth tooth-shaped projection 9 having no defective region E is opposed to each other.

【００４０】転造の際には、上記したように２個一組の
第３転造工具７間に対象物Ｆを配置した状態で、一方Ａ
の第３転造工具７を矢印Ｗ１方向に回転させるととも
に、他方Ｂの第３転造工具７を矢印Ｗ２方向に回転さ
せ、且つ、対象物Ｆを矢印Ｗ３方向に回線させつつ、２
個一組の第３転造工具７を互いに接近する方向（矢印Ｕ
３，Ｕ４方向）に同期させつつ、少しずつ押込操作す
る。これにより転造初期の割切り処理が実行される。At the time of rolling, while the object F is placed between the pair of third rolling tools 7 as described above, one A
While rotating the third rolling tool 7 in the direction of the arrow W1 while rotating the third B rolling tool 7 in the direction of the arrow W2 and making the object F line in the direction of the arrow W3,
The direction in which the set of third rolling tools 7 approaches each other (arrow U
(3, U4 direction) and push operation little by little. Thereby, the initial splitting process is performed.

【００４１】即ち、一方Ａの第３転造工具７において
は、ノーマルな第４歯状突起９が対象物Ｆの外周部に当
たり、極く浅い溝跡である割切り跡Ｘ１,Ｘ２，Ｘ３…
が対象物Ｆの外周部に周方向に沿って所定のピッチＰＣ
で形成される。このとき一方Ａの第３転造工具７の第３
歯状突起８の第３歯先面８２には前記したように欠損領
域Ｅが形成されているため、一方Ａの第３転造工具７の
第３歯状突起８は対象物Ｆの外周部に当たらない。従っ
て、一方Ａの第３転造工具７では、欠損領域Ｅをもたな
いノーマルな第４歯状突起９だけで割切りが行われ、欠
損領域Ｅをもつ第３歯状突起８では割切りが行われな
い。That is, in the third rolling tool A of A, the normal fourth tooth-shaped projection 9 hits the outer peripheral portion of the object F, and the cut marks X1, X2, X3...
Is a predetermined pitch PC along the circumferential direction on the outer peripheral portion of the object F.
Is formed. At this time, the third rolling tool 7
Since the missing region E is formed on the third tooth tip surface 82 of the tooth-shaped projection 8 as described above, the third tooth-shaped projection 8 of the third rolling tool 7 of A is located on the outer peripheral portion of the object F. Does not hit. Therefore, on the other hand, in the third rolling tool 7 of A, the splitting is performed only by the normal fourth tooth-shaped projection 9 having no defective area E, and the third tooth-shaped projection 8 having the defective area E is split. Is not done.

【００４２】これに対して他方Ｂの第３転造工具７にお
いても、同様に、欠損領域Ｅをもたないノーマルな第４
歯状突起９が対象物Ｆの外周部に当たり、極く浅い溝跡
である割切り跡Ｙ１,Ｙ２，Ｙ３…が対象物Ｆの外周部
に周方向に沿って所定のピッチＰＤ（ＰＤ=ＰＣ）で形
成される。なお、一方Ａの第３転造工具７で形成される
割切り跡をＸ系（Ｘ１,Ｘ２，Ｘ３…）とし、他方Ｂの
第３転造工具７で形成される割切り跡をＹ系（Ｙ１,Ｙ
２，Ｙ３…）とすると、Ｘ系とＹ系とが交互に位置する
ものである。故に、割切り跡のピッチは、（ＰＤ／２）
=（ＰＣ／２）となり、第１実施例での割切り跡のピッ
チＰＡと等応する。On the other hand, in the third rolling tool 7 on the other side B, similarly, the normal fourth rolling tool 7 having no defective area E
The tooth-shaped projection 9 hits the outer peripheral portion of the object F, and the split marks Y1, Y2, Y3, which are extremely shallow groove marks, are provided on the outer peripheral portion of the object F at a predetermined pitch PD (PD = PC) along the circumferential direction. ). In addition, the cutting trace formed by the third rolling tool 7 on the one side A is X-system (X1, X2, X3...), And the cutting trace formed by the third rolling tool 7 on the other side is the Y-series. (Y1, Y
2, Y3...), The X system and the Y system are located alternately. Therefore, the pitch of the cleavage marks is (PD / 2)
= (PC / 2), which is equivalent to the pitch PA of the cleavage trace in the first embodiment.

【００４３】このとき他方Ｂの第３転造工具７の第３歯
状突起８の第３歯先面８２には欠損領域Ｅが形成されて
いるため、他方Ｂの第３転造工具７の第３歯状突起８の
第３歯先面８２は対象物Ｆに当たらない。従って、他方
Ｂの第３転造工具７でＭ、欠損領域Ｅをもたないノーマ
ルな第４歯状突起９だけで割切りが行われ、欠損領域Ｅ
を備えた第３歯状突起８では割切りが行われない。At this time, since the missing area E is formed in the third tooth tip surface 82 of the third tooth-shaped projection 8 of the other B third rolling tool 7, the other B third rolling tool 7 The third tip surface 82 of the third tooth-shaped projection 8 does not hit the object F. Accordingly, the third rolling tool 7 on the other side B cuts only the M and the normal fourth tooth-shaped projection 9 having no defective area E, and the defective area E
No splitting is performed on the third tooth-shaped projections 8 provided with.

【００４４】割切り処理が終わるまで、一組の第３転造
工具７の押し込み量を実質的には増加させない。これに
より割切り跡Ｘ１,Ｘ２，Ｘ３…，Ｙ１,Ｙ２，Ｙ３…が
これの深さが有る程度深くなるように拡開する。その
後、第１転造工具１及び第２転造工具４の押し込み操作
を再開して、押し込み量を増加させる。これにより一方
Ａの第３転造工具７と他方Ｂの第３転造工具７との双方
によって、対象物Ｆが転造成形され、転造歯車Ｆ３（歯
部の数は偶数個）となる。Until the cleaving process is completed, the pushing amount of the set of third rolling tools 7 is not substantially increased. .., Y1, Y2, Y3... Are expanded so as to have a certain depth. Thereafter, the pushing operation of the first rolling tool 1 and the second rolling tool 4 is restarted, and the pushing amount is increased. As a result, the object F is roll-formed by both the third A rolling tool 7 on the one side and the third rolling tool 7 on the other side B to form a rolling gear F3 (the number of teeth is an even number). .

【００４５】上記したように割切り跡Ｘ１,Ｘ２，Ｘ３
…，Ｙ１,Ｙ２，Ｙ３…が拡開すれば、一方Ａ及び他方
Ｂを構成する一組の第３転造工具７の周方向の位相が必
ずしも厳密には対応していない場合であっても、拡開し
た割切り跡Ｘ１,Ｘ２,Ｘ３…，Ｙ１,Ｙ２，Ｙ３…に、
一方Ａ及び他方Ｂの第３転造工具７の第３歯状突起８及
び第４歯状突起９の双方が係合できるため、成形が良好
に進行できる。As described above, the cleavage marks X1, X2, X3
, Y1, Y2, Y3,... Are expanded, even if the circumferential phases of the set of third rolling tools 7 constituting one A and the other B do not always correspond exactly. , The split marks X1, X2, X3 ..., Y1, Y2, Y3 ...
Since both the third toothed projection 8 and the fourth toothed projection 9 of the third rolling tool 7 on the one A and the other B can engage with each other, molding can proceed favorably.

【００４６】成形後に、サイジング処理を所定時間行な
う。この場合には、一組の第３転造工具７の押し込み量
を実質的には増加させない。サイジング処理後に、一組
の第３転造工具７を互いに離間させる。 （第２実施例の効果）以上説明したように本実施例によ
れば、割切り跡Ｘ１，Ｘ２，Ｘ３…は、一方Ａの第３転
造工具７だけで形成される。また他の割切り跡Ｙ１，Ｙ
２，Ｙ３…は、他方Ｂの第３転造工具７だけで形成され
る。そのため対象物Ｆの周長と第３転造工具７の周長と
を対応させておけば、一方Ａの第３転造工具７と他方Ｂ
の第３転造工具７との周方向の位相が若干ずれているよ
うな場合であっても、割切り跡の数が予想外に増加する
ことを抑止でき、割切り不良を抑え得る。よって従来技
術とは異なり、製品である転造歯車Ｆ３において、割切
り跡が打痕傷として残る問題を解消するのに有利であ
る。After the molding, a sizing process is performed for a predetermined time. In this case, the pushing amount of the set of third rolling tools 7 is not substantially increased. After the sizing process, the set of third rolling tools 7 is separated from each other. (Effects of the Second Embodiment) As described above, according to the present embodiment, the cut marks X1, X2, X3,... Are formed only by the third rolling tool 7 of A. In addition, other cleavage marks Y1, Y
2, Y3... Are formed only by the third B third rolling tool 7. Therefore, if the circumference of the object F and the circumference of the third rolling tool 7 are made to correspond to each other, the third rolling tool 7 on one side A and the other B on the other side
Even if the phase of the third rolling tool 7 in the circumferential direction is slightly deviated, it is possible to suppress an unexpected increase in the number of split marks, and to suppress poor splitting. Therefore, unlike the prior art, the rolled gear F3 as a product is advantageous in eliminating the problem that the cut marks remain as dent scratches.

【００４７】本実施例においても、図５に示す転造歯車
Ｆ３の噛合面Ｆ５は、第３転造工具７の第３歯状突起８
の第３かみ合い面８０、第４歯状突起９の第４かみ合い
面９０で成形される。従って転造歯車Ｆ３のうち高精度
化が最も要請される噛合面Ｆ５の精度は確保される。更
に本実施例では、欠損領域Ｅをもたないノーマルな第４
歯状突起９の第４歯先面９２によって転造歯車Ｆ３の歯
底面Ｆ６が成形されるため、転造歯車Ｆ３の歯底面Ｆ６
の精度も確保される。しかも本実施例では成形後にサイ
ジング処理を追加するため、転造歯車Ｆ３の歯底面Ｆ６
の精度も、なおさら確保される。Also in this embodiment, the meshing surface F5 of the rolling gear F3 shown in FIG.
And the fourth meshing surface 90 of the fourth tooth-shaped projection 9. Therefore, the accuracy of the meshing surface F5 of the rolled gear F3, which requires the highest accuracy, is ensured. Furthermore, in the present embodiment, the normal fourth
Since the bottom surface F6 of the rolled gear F3 is formed by the fourth tip surface 92 of the tooth-shaped projection 9, the bottom surface F6 of the rolled gear F3 is formed.
Accuracy is also ensured. In addition, in this embodiment, since a sizing process is added after molding, the tooth bottom surface F6 of the rolled gear F3 is added.
Accuracy is further ensured.

【００４８】更に本実施例では、図６に示すように、一
方Ａの第３転造工具７と他方Ｂの第３転造工具７とは、
同種のものを採用できる。そのため、使用する転造工具
の種類を削減でき、転造工具の製造や保守管理に有利で
ある。 （他の実施例）図９に示す他の実施例のように、はす歯
形状の歯状突起２Ｍを周方向に列設した転造工具１Ｍと
しても良い。Further, in the present embodiment, as shown in FIG. 6, the third rolling tool 7 on one side A and the third rolling tool 7 on the other side B
The same kind can be adopted. For this reason, the types of rolling tools to be used can be reduced, which is advantageous for manufacturing and maintenance of the rolling tools. (Other Embodiment) As in another embodiment shown in FIG. 9, a rolling tool 1M in which helical tooth-shaped projections 2M are arranged in the circumferential direction may be used.

【００４９】そのほか本発明は上記し且つ図面に示した
実施例のみに限定されるものではなく、例えば、転造工
具の諸言は表１に示すものに限定されるものではなく、
他の諸言でも良いことは勿論であり、必要に応じて適宜
変更して実施できるものである。 （付記）上記した記載から次の技術的思想も把握でき
る。・周方向に列設した複数個の歯状突起をもつ２個一
組の転造工具と、対象物とを用い、対象物に割切り処理
を実行した後に、対象物に転造成形を実行する転造方法
において、割切り処理の際には、２個一組の転造工具の
うち、他方の転造工具の歯状突起を対象物に当てること
なく、つまり他方の転造工具では割切りを実行すること
なく、一方の転造工具の歯状突起を対象物に当てて一方
の転造工具だけで割切りを行うことを特徴とする転造方
法。In addition, the present invention is not limited to the embodiment described above and shown in the drawings. For example, the terms of the rolling tool are not limited to those shown in Table 1.
Needless to say, other words may be used, and the wording can be appropriately changed and implemented as needed. (Supplementary Note) The following technical ideas can be understood from the above description.・ Using a set of two rolling tools having a plurality of tooth-shaped projections arranged in the circumferential direction and a target object, performing a splitting process on the target object, and then performing a roll forming on the target object. In the cutting method, the toothed projections of the other rolling tool in the set of two rolling tools are not brought into contact with the target object, that is, the other rolling tool is divided. A rolling method, wherein a tooth-shaped projection of one of the rolling tools is applied to an object without performing cutting, and splitting is performed by only one of the rolling tools.

【００５０】[0050]

【発明の効果】請求項１の本発明によれば、転造初期に
おいて、一組の転造工具の双方で割切り跡を形成する方
式を廃止し、一組の転造工具のうち一方の転造工具だけ
で、割切り跡を形成する。そのため、対象物の周長と転
造工具の周長とを対応させておけば、一組の転造工具の
周方向の位相が若干ずれているような場合であっても、
割切り跡の数が予想外に増加することを抑止できる。故
に、割切り跡が転造歯車に打痕傷として残留することを
防止するのに有利である。According to the first aspect of the present invention, in the initial stage of rolling, a method of forming a split mark with both sets of rolling tools is abolished, and one of the sets of rolling tools is eliminated. Forming split marks only with rolling tools. Therefore, if the circumferential length of the object and the circumferential length of the rolling tool are associated with each other, even if the circumferential phase of a set of rolling tools is slightly shifted,
An unexpected increase in the number of cleavage marks can be suppressed. Therefore, it is advantageous to prevent the cut marks from remaining on the rolled gear as dents.

【００５１】請求項２の本発明によれば、一組の転造工
具の歯状突起の全部で割切り跡を形成する方式を廃止
し、一組の転造工具のうち１個おきの歯状突起だけで、
割切り跡を形成する。そのため、対象物の周長と転造工
具の周長とを対応させておけば、一組の転造工具の周方
向の位相が若干ずれているような場合であっても、割切
り跡の数が予想外に増加することを抑止できる。故に、
割切り跡が転造歯車に打痕傷として残留することを防止
するのに有利である。According to the second aspect of the present invention, the method of forming a split mark with all the tooth-shaped projections of one set of rolling tools is eliminated, and every other tooth of one set of rolling tools is eliminated. Only by the projection
Form a cleaved mark. Therefore, if the circumference of the object and the circumference of the rolling tool are made to correspond to each other, even if the phase in the circumferential direction of a set of rolling tools is slightly shifted, The number can be prevented from increasing unexpectedly. Therefore,
This is advantageous in preventing the cut marks from remaining on the rolled gear as dent scratches.

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

【図１】転造工具を用いて転造初期において割切りを実
行している形態を示す第１実施例の工程図である。FIG. 1 is a process diagram of a first embodiment showing a mode in which splitting is performed at an initial stage of rolling using a rolling tool.

【図２】第１転造工具の欠損領域をもたないノーマルな
第１歯状突起の拡大側面図である。FIG. 2 is an enlarged side view of a normal first tooth-shaped projection having no defective region of a first rolling tool.

【図３】第２転造工具の欠損領域をもつ第２歯状突起の
拡大側面図である。FIG. 3 is an enlarged side view of a second tooth-shaped projection having a defective area of a second rolling tool.

【図４】転造成形における転造工具の押し込み形態を示
すグラフである。FIG. 4 is a graph showing the form of pushing of a rolling tool in the rolling forming.

【図５】転造成形で形成した転造歯車の要部の平面図で
ある。FIG. 5 is a plan view of a main part of a rolled gear formed by roll forming.

【図６】転造工具を用いて転造初期において割切りを実
行している形態を示す第２実施例の工程図である。FIG. 6 is a process diagram of a second embodiment showing a mode in which splitting is performed at an early stage of rolling using a rolling tool.

【図７】第３転造工具の欠損領域をもたないノーマルな
第４歯状突起の拡大平面図である。FIG. 7 is an enlarged plan view of a normal fourth tooth-shaped projection having no defective region of the third rolling tool.

【図８】第３転造工具の欠損領域をもつ第３歯状突起の
拡大平面図である。FIG. 8 is an enlarged plan view of a third tooth-shaped projection having a defective area of a third rolling tool.

【図９】他の実施例に係る転造工具の要部の概略斜視図
である。FIG. 9 is a schematic perspective view of a main part of a rolling tool according to another embodiment.

【図１０】従来技術に係り、一組の転造工具を用いて転
造初期において割切りを実行している形態を示す工程図
である。FIG. 10 is a process diagram showing an embodiment in which cleaving is performed at an early stage of rolling using a set of rolling tools according to the related art.

【符号の説明】[Explanation of symbols]

図中、１は第１転造工具、２は第１歯状突起、４は第２
転造工具、５は第２歯状突起、Ｅは欠損領域、Ｆは対象
物、Ｆ３は転造歯車、７は第３転造工具、８は第３歯状
突起、９は第４歯状突起を示す。In the figure, 1 is a first rolling tool, 2 is a first tooth-shaped projection, 4 is a second
Rolling tool, 5 is a second tooth-like projection, E is a defective area, F is an object, F3 is a rolling gear, 7 is a third rolling tool, 8 is a third tooth-like projection, and 9 is a fourth tooth-like. The projection is shown.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】複数の第１歯状突起が周方向に列設された
歯車状の第１転造工具と、複数の第２歯状突起が周方向
に列設され第１転造工具とともに対象物を転造する歯車
状の第２転造工具との組合わせであって、 第２転造工具の第２歯状突起の歯先面は、第１転造工具
の第１歯状突起の歯先面よりも求心方向に退避している
ことを特徴とする転造工具の組合わせ。1. A gear-shaped first rolling tool in which a plurality of first tooth-shaped projections are arranged in a circumferential direction, and a first rolling tool in which a plurality of second tooth-shaped projections are arranged in a circumferential direction. Combination with a gear-shaped second rolling tool for rolling an object, wherein the tip surface of the second toothed projection of the second rolling tool is the first toothed projection of the first rolling tool. A combination of a rolling tool, which is retracted in a centripetal direction from a tooth tip surface of a rolling tool. 【請求項２】複数の歯状突起が周方向に列設された歯車
状の転造工具であって、 一個おきの歯状突起の歯先面は、隣設する他の歯状突起
の歯先面よりも求心方向に退避していることを特徴とす
る転造工具。2. A gear-shaped rolling tool in which a plurality of tooth-shaped projections are arranged in a circumferential direction, wherein a tooth tip surface of every other tooth-shaped projection is a tooth of another adjacent tooth-shaped projection. A rolling tool characterized by being retracted in the centripetal direction from the front surface.
JP3284698A 1998-02-16 1998-02-16 Combination of form rolling tool, and form rolling tool Pending JPH11226690A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3284698A JPH11226690A (en) 1998-02-16 1998-02-16 Combination of form rolling tool, and form rolling tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3284698A JPH11226690A (en) 1998-02-16 1998-02-16 Combination of form rolling tool, and form rolling tool

Publications (1)

Publication Number Publication Date
JPH11226690A true JPH11226690A (en) 1999-08-24

Family

ID=12370204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3284698A Pending JPH11226690A (en) 1998-02-16 1998-02-16 Combination of form rolling tool, and form rolling tool

Country Status (1)

Country Link
JP (1) JPH11226690A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013132645A (en) * 2011-12-26 2013-07-08 Aisin Seiki Co Ltd Method and apparatus for rolling gear
JP2015123484A (en) * 2013-12-27 2015-07-06 アイシン精機株式会社 Rolling device and rolling method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013132645A (en) * 2011-12-26 2013-07-08 Aisin Seiki Co Ltd Method and apparatus for rolling gear
JP2015123484A (en) * 2013-12-27 2015-07-06 アイシン精機株式会社 Rolling device and rolling method

Similar Documents

Publication Publication Date Title
KR20140021710A (en) Toothing for operation at a deflection angle and production method
US5809649A (en) Method for the manufacture of a machine part having external toothing
JP2004076837A (en) Synchro sleeve in use for gear transmission and its press-forming apparatus
EP2958698B1 (en) Slide rolling process for the generation of bevel gears
JPH11226690A (en) Combination of form rolling tool, and form rolling tool
KR100441929B1 (en) Method of forming toothed wheels and product formed thereby
KR101277383B1 (en) Form rolling die
JPH071232A (en) Cutter blade
JP2004105974A (en) Gear shaft and flat die for form rolling
JPH09248645A (en) Method and device for roll forming gear
JP3709712B2 (en) Clutch drum tooth forming method and tooth profile
JP3429711B2 (en) Cup-shaped gear manufacturing equipment
JP4543771B2 (en) Gear rolling method and rolling apparatus
JP3738224B2 (en) Gear shaft and flat die for rolling gear shaft
JP2010179327A (en) Form rolling tool and spline shaft
JP2007307567A (en) Rolling tool, and rolling method
JP3631109B2 (en) Helical broach processing method and helical broach
JP2019058922A (en) Rolling flat die
EP0665082B1 (en) A method of forming grooves with cutting edges in the sides of the teeth of a shaving cutter and a tool for carrying out the method
JP5135837B2 (en) Gear rolling method and rolling apparatus
JPH049238A (en) Production of outside ring
JP3713465B2 (en) Rolling method
JP2003230928A (en) Form rolling method and form rolling flat die
CN118055822A (en) Manufacturing of differential gears
JPS6324782B2 (en)