JP5328198B2 - Ring rolling method for ring-shaped products with complex surface profile in the axial direction - Google Patents

Ring rolling method for ring-shaped products with complex surface profile in the axial direction Download PDF

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JP5328198B2
JP5328198B2 JP2008086265A JP2008086265A JP5328198B2 JP 5328198 B2 JP5328198 B2 JP 5328198B2 JP 2008086265 A JP2008086265 A JP 2008086265A JP 2008086265 A JP2008086265 A JP 2008086265A JP 5328198 B2 JP5328198 B2 JP 5328198B2
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JP2009233732A (en
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道明 永利
利尚 中溝
誠 松ケ下
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Sanyo Special Steel Co Ltd
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Description

この発明は、軸方向断面の表面形状が複雑なリング状製品、例えばテーパーベアリング内輪ケース、のリングローリング成形による製造方法に関する   The present invention relates to a manufacturing method by ring rolling molding of a ring-shaped product having a complicated axial cross-sectional surface shape, for example, a tapered bearing inner ring case.

軸方向断面の表面形状が複雑なリング状製品をリングローリング方法により製造する場合、その複雑な形状の径の異なる部位ごとに、リングローリングの際に、周速差が生じる。このために、リングローリング中の製品素材の表面と成形ロールとの間や控ロールとの間にスリップする箇所が生じ、その結果、リング状製品の表面にムシレ疵などの疵が発生する場合がある。   When a ring-shaped product having a complicated surface shape in the axial direction cross section is manufactured by the ring rolling method, a peripheral speed difference is generated in the ring rolling for each portion of the complicated shape having a different diameter. For this reason, there are places where slipping occurs between the surface of the product material during ring rolling and the forming roll or between the holding rolls, and as a result, wrinkles such as mussels are generated on the surface of the ring-shaped product. is there.

上記の様なムシレ疵がリング状製品に生じると、このムシレ疵の部分を旋削によって径で例えば２．５ｍｍを削っても、黒皮が残る状態であった。そこで、このムシレ疵の発生する原因について究明すると、第１に製品に存在する大きな外径の部分と小さな外径の部分との間に大きな周差があること、第２に製品素材をリングローリング装置によりリングローリング時に、装置の控ロールの周辺からムシレた小片が飛び散ってさらに製品表面に疵をつけること、第３に控ロールがリング状素材に焼き付いた状態でリングローリングを行うと、ムシレ疵が発生することがあった。   When the above-mentioned mussels were produced in a ring-shaped product, even if the mussels were turned to have a diameter of, for example, 2.5 mm, a black skin remained. Therefore, the cause of the occurrence of mussels is investigated. First, there is a large circumferential difference between the large outer diameter portion and the small outer diameter portion existing in the product, and second, the product material is ring-rolled. When ring rolling is carried out by the device, small pieces scattered from the periphery of the holding roll of the device are scattered and the surface of the product is further wrinkled. May occur.

これらのことから、ムシレ疵の発生の原因を推定すると、製品形状に大外径の部分と小外径の部分があることによる外形差により、上記の周速差が製品の大外径の部分と小外径の部分に生じる。例えば、製品寸法で大外径がφ１６４．７ｍｍで、小外径がφ１２９．１ｍｍである場合、大外径側は小外径に対して約２７％周速が速い。これに対して大径ロールと小径ロールの一体型からなる保持ロールである控ロールの場合は、大径ロールの部分と小径ロールの部分の間に約６０〜７０％という大きな周速差があり、これはリング状製品の周速差の分布と正反対に分布している。これらの理由で、リング状製品の周速と控ロールの周速とが極端に整合しない箇所に、例えば製品の大鍔外径の部分に、ムシレ疵が発生すると推定される。   Based on these facts, the cause of the occurrence of mussel flaws is estimated. Due to the difference in outer shape due to the large outer diameter portion and the small outer diameter portion in the product shape, the above peripheral speed difference is the large outer diameter portion of the product. And occurs in small outer diameter parts. For example, when the product size has a large outer diameter of φ164.7 mm and a small outer diameter of φ129.1 mm, the peripheral speed on the large outer diameter side is about 27% faster than the small outer diameter. On the other hand, in the case of the holding roll which is a holding roll formed by integrating the large diameter roll and the small diameter roll, there is a large peripheral speed difference of about 60 to 70% between the large diameter roll portion and the small diameter roll portion. This is distributed in the opposite direction to the distribution of the peripheral speed difference of the ring-shaped product. For these reasons, it is presumed that mussels are generated at locations where the peripheral speed of the ring-shaped product and the peripheral speed of the holding roll do not extremely match, for example, at the outer diameter of the product.

従来のリングローリングにおいて、段部のある製品の製造で製品の皺や表層の巻き込みによる疵の防止方法が提案されている（例えば、特許文献１参照。）。このものは製品素材の段部に圧縮応力が生じて段部の表面に皺や巻き込みにより生じる疵を防止する方法である。   In conventional ring rolling, there has been proposed a method for preventing wrinkles due to product wrinkles and surface entrainment in the manufacture of products with stepped portions (for example, see Patent Document 1). This is a method of preventing wrinkles generated by compressive stress in the stepped portion of the product material and wrinkles or entrainment on the surface of the stepped portion.

さらに、エッジャーにより製品リングの高さ方向の圧下が行われるリングローリングにおいて、リング状被圧延材にへこみなどの形状不良の発生を低減する方法が提案されている（例えば、特許文献２参照。）。この方法はマンドレルの周面の複数箇所に潤滑油を放出して面圧負荷に対し、摩擦係数を減少させて材料の変形をスムーズにしてへこみによる疵発生を防止する方法である。   Furthermore, in ring rolling in which the product ring is reduced in the height direction by an edger, a method for reducing the occurrence of shape defects such as dents in the ring-shaped rolled material has been proposed (see, for example, Patent Document 2). . This method is a method in which lubricating oil is discharged to a plurality of locations on the peripheral surface of the mandrel to reduce the coefficient of friction against the surface pressure load, thereby smoothly deforming the material and preventing wrinkles due to dents.

さらに、軸方向断面形状が軸方向非対称なリング状ワークを、その円筒度を保ちながら所定の寸法形状に圧延成形するローリング方法が提案されている（例えば、特許文献３参照）。この方法は加工前における初期肉厚寸法を、拡大率が軸方向に均一になるように設定して成形品の円筒度を確保して所定寸法に成形する方法である。しかし、上記の従来方法はいずれも成形ロールは一体型のものを用いる方法によるものであった。   Furthermore, a rolling method has been proposed in which a ring-shaped workpiece having an axially asymmetric axial cross-section is rolled and formed into a predetermined dimensional shape while maintaining its cylindrical degree (see, for example, Patent Document 3). This method is a method in which the initial thickness dimension before processing is set so that the enlargement ratio is uniform in the axial direction, and the cylindrical degree of the molded product is ensured to be molded into a predetermined dimension. However, all of the above conventional methods are based on a method in which the forming roll is an integral type.

特開２００４−９０７０号公報Japanese Patent Application Laid-Open No. 2004-9070 特開２００２−２３９６０７号公報JP 2002-239607 A 特開平６−１９０４８４号公報JP-A-6-190484

本発明が解決しようとする課題は、軸方向の断面形状が複雑なリング状製品をリングローリングにより成形する場合に、リング状製品の形状により部位ごとの製品表面に周速差が生じるため、リングローリング中の製品表面と成形ロールや控ロールとの間にスリップが生じて製品表面にキズが発生する。そこで、本発明では、軸方向の断面形状が複雑な部位と単純な部位を有するリング状製品をリングローリング成形する方法において、その形状による部位ごとの回転時の周速差を解消して製品の表面にスリップにより生ずるムシレ疵の発生を解消する方法を提供することである。   The problem to be solved by the present invention is that when a ring-shaped product having a complicated cross-sectional shape in the axial direction is formed by ring rolling, a peripheral speed difference occurs on the product surface for each part due to the shape of the ring-shaped product. Slip is generated between the product surface during rolling and the forming roll or holding roll, and the product surface is scratched. Therefore, in the present invention, in a method of ring rolling molding a ring-shaped product having a complicated cross-sectional shape in the axial direction and a simple part, the peripheral speed difference at the time of rotation for each part due to the shape is eliminated, and the product It is an object of the present invention to provide a method for eliminating the generation of mussels caused by slip on the surface.

ところで、リングローリング用の控ロールすなわちリング状製品の外径を保持する控ロールは、控ロールの外径が軸方向断面に複雑形状部と単純形状部からなっている場合であっても、これらの形状部は一体型の控ロールから形成されていた。しかし、本発明の手段では、このリング状製品の外径を保持する控ロールの軸方向断面で複雑形状部からなる大径部分と単純形状部からなる小径部分を分割して、分割した２本の控ロールとし、大径部分の控ロールの周速と小径部分の控ロールの周速との間のずれを解消して、リング状素材との間にスリップをなくすことにより、リングローリングによるリング状製品にムシレ疵の発生をなくす方法である。 By the way, the retaining roll for ring rolling, that is, the retaining roll for holding the outer diameter of the ring-shaped product, is used even when the outer diameter of the retaining roll is composed of a complicated shape portion and a simple shape portion in the axial section. The shape part of was formed from an integral holding roll. However, the means of the present invention divides the large-diameter portion made of a complex shape portion and the small-diameter portion made of a simple shape portion into two divided pieces in the axial section of the holding roll that holds the outer diameter of the ring-shaped product. A ring by ring rolling by eliminating the slip between the circumferential speed of the retaining roll of the large diameter part and the circumferential speed of the retaining roll of the small diameter part and eliminating the slip between the ring-shaped material. This is a method to eliminate the occurrence of mussels in the product.

上記の課題を解決するための本発明の手段は、請求項１の発明では、成形ロールとマンドレル間にリング状素材を挟持し、マンドレルを挿通したリング状素材に対向して成形ロールと控ロールを対称に配置し、成形ロールと控ロールによりリング状素材の外周面を保持してリングローリングによりリング状製品を製造する製造方法において、リング状素材の軸方向断面の表面を小径部から順次異なる拡径部となる円筒表面形状で周速度が軸方向で異なる複数の曲線で形成の複雑形状部と単一直線で形成の単純形状部からなる形成面とし、さらに控ロールの軸方向断面の表面を小径部から順次異なる拡径部となる円筒表面形状で周速度が軸方向で異なる複数の曲線で形成の複雑形状部と円筒表面の周速度が軸方向で一定である同径の円筒表面の単一直線で形成の単純形状部からなる表面とし、かつ、これらの控ロールを複雑形状部と単純形状部の境界で分割して控ロールの複雑形状部と控ロールの単純形状部を別体からなるものとし、リング状素材の複雑形状部の形成面の周速に控ロールの複雑形状部の表面の周速を合致させて転動させ、かつ、リング状素材の単純形状部の形成面の周速に控ロールの単純形状部の表面の周速を合致させて転動させることを特徴とする軸方向断面の表面形状が複雑なリング状製品のムシレ疵の発生をなくしたリングローリング方法である。 The means of the present invention for solving the above-mentioned problems is that, in the invention of claim 1, the ring-shaped material is sandwiched between the molding roll and the mandrel, and the molding roll and the holding roll are opposed to the ring-shaped material inserted through the mandrel. In the manufacturing method of manufacturing the ring-shaped product by ring rolling while holding the outer peripheral surface of the ring-shaped material with the forming roll and the holding roll, the surface of the axial cross section of the ring-shaped material is sequentially changed from the small diameter part. The surface of the cross section in the axial direction of the leveling roll is a forming surface consisting of a complex shape portion formed by a plurality of curves with different peripheral speeds in the axial direction and a simple shape portion formed by a single straight line. a cylindrical surface shape which is successively different diameter portion of the small diameter portion peripheral speed is the peripheral speed of the complicated shape portion and the cylindrical surface of the forming of a plurality of curves different in the axial direction of the diameter of the cylindrical surface is constant in the axial direction And the surface consisting of a simple shape of a straight line in formation, and consists of separate simple shape portions of the complex shaped part and refrain roll copy roll by dividing these copy rolls at the boundaries of complex-shaped portion and a simple shape portion The rolling speed is adjusted so that the circumferential speed of the surface of the complicated shape part of the ring-shaped material matches the peripheral speed of the surface of the complicated shape part of the ring roll, and the circumference of the surface of the simple shape part of the ring material is rolled. It is a ring rolling method that eliminates the occurrence of mussels in a ring-shaped product with a complicated surface shape in the axial cross section, which rolls by matching the peripheral speed of the surface of the simple shape portion of the holding roll to the speed. .

本発明は、上記の手段の方法としたことで、リングローリングにより成形された軸方向断面の表面形状が複雑なリング状製品におけるムシレ疵が解消され、このムシレ疵による製品の不良が低減されたニアネット製品が得られ、リング状製品の仕上げ旋削によるムシレ疵の取代分が削減でき、その結果、生産効率が向上するなど、本発明は従来にない優れた効果を奏する方法である。   By adopting the method of the above-mentioned means, the present invention eliminates the mess in the ring-shaped product having a complicated surface shape in the axial section formed by ring rolling, and the defects of the product due to the mussels are reduced. The present invention is a method that has an unprecedented effect, such as obtaining near-net products and reducing the stock removal by finishing turning of ring-shaped products, resulting in improved production efficiency.

先ず、従来のリングローリング装置の断面図を図２により説明する。このリングローリング装置は、図２の断面図に示すように、縦型リングローリング装置１である。この成形に関わる金型は、主ロールである成形ロール２と、中ロールのマンドレル５と、控ロール６である。図３に示すように、水平方向から２０°あるいは３０°傾いた主軸４が２本あり、これらは主軸箱３に一定の角速度で回転する状態で配設されている。この主軸４の１本に成形ロール２が１枚取り付けられて固定されて主軸４の回転とともに回転する。２枚からなる１組の傾いた成形ロール２はそれらのロール外周部の一箇所で互いに当接して当接部２ｃとなっている。これらの２枚の成形ロール２から形状化された当接部２ｃの断面形状２ｄでリング状素材８を形状化してリング状製品９の断面形状９ａを形成するように設計されており、この当接部２ｃの断面形状２ｄでリング状素材８の外径および幅面を拘束する。中ロールであるマンドレル５は図３に示すロールブロック７に取り付けられており、ロールブロック７自体が油圧で上昇し、マンドレル５と成形ロール２の間でリング状素材８を圧下してリング状製品９に成形する。このマンドレル５はローリング時にリング状素材８との摩擦により回転する被駆動式である。控ロール６はローリング中のリング状素材８の外周面８ａを保持しつつ、成形されたリング状製品９の真円度を成形末期において確保する。この控ロール６は、図２に見られるように、リング状素材８の外径にあわせて３〜５個が配設されている。   First, a cross-sectional view of a conventional ring rolling apparatus will be described with reference to FIG. This ring rolling device is a vertical ring rolling device 1 as shown in the sectional view of FIG. The molds related to this molding are a molding roll 2 that is a main roll, a mandrel 5 that is a middle roll, and a retaining roll 6. As shown in FIG. 3, there are two main shafts 4 tilted by 20 ° or 30 ° from the horizontal direction, and these are arranged in the main shaft box 3 in a state of rotating at a constant angular velocity. One molding roll 2 is attached and fixed to one of the main shafts 4 and rotates with the rotation of the main shaft 4. A pair of inclined forming rolls 2 made of two sheets are in contact with each other at one place on the outer periphery of the rolls to form a contact portion 2c. The ring-shaped material 8 is shaped by the cross-sectional shape 2d of the abutting portion 2c formed from these two forming rolls 2, and the cross-sectional shape 9a of the ring-shaped product 9 is formed. The outer diameter and the width surface of the ring-shaped material 8 are constrained by the cross-sectional shape 2d of the contact portion 2c. The mandrel 5 which is a middle roll is attached to the roll block 7 shown in FIG. 3, and the roll block 7 itself is raised by hydraulic pressure, and the ring-shaped material 8 is pressed down between the mandrel 5 and the forming roll 2 to form a ring-shaped product. 9 to form. The mandrel 5 is a driven type that rotates due to friction with the ring-shaped material 8 during rolling. The cutting roll 6 secures the roundness of the molded ring-shaped product 9 at the end of molding while holding the outer peripheral surface 8a of the ring-shaped material 8 during rolling. As shown in FIG. 2, 3 to 5 of the cutting rolls 6 are arranged according to the outer diameter of the ring-shaped material 8.

この縦型リングローリング装置１の特徴の一つは、主ロールである成形ロール２の主軸４が水平方向に角度を有して傾いていることである。この例として、成形ロール２の主軸４が水平方向のＸ軸から２０°傾斜している場合を図３により説明する。この場合、成形ロール２の描く軌道は垂直方向のＹ軸から２０°傾斜した円軌道となる。この状態でリング状素材８をリングローリングすると、リング状素材８の水平方向かつ軸方向に直角なＺ軸方向の圧延力と、垂直方向であるＹ軸方向の圧下力に加えて、リング状素材８の軸方向であるＸ軸方向の圧下力がローリング部位に発生し、常にリング状素材８の幅方向への圧下力がリング状素材８に掛かりながら圧下される。この幅方向からの圧下力が発生する理由は、成形ロール２の主軸４が水平から傾斜しているからである。したがって、もし成形ロール２の主軸４が水平である場合には、リング状素材８の幅方向への圧下力は発生しない。この縦型リングローリング装置１では、リング状素材８への幅方向の圧下力が連続的に存在することにより、当接する２枚の成形ロール２、２間のリング状素材８をＸ軸方向に変形する変形能が向上する。したがって、より複雑な断面形状を有するリング状製品９の製造が可能である。   One of the features of the vertical ring rolling device 1 is that the main shaft 4 of the forming roll 2, which is the main roll, is inclined at an angle in the horizontal direction. As an example of this, the case where the main shaft 4 of the forming roll 2 is inclined 20 ° from the horizontal X-axis will be described with reference to FIG. In this case, the trajectory drawn by the forming roll 2 is a circular trajectory inclined by 20 ° from the Y axis in the vertical direction. When the ring-shaped material 8 is subjected to ring rolling in this state, in addition to the rolling force in the Z-axis direction perpendicular to the horizontal direction and the axial direction of the ring-shaped material 8 and the rolling force in the Y-axis direction which is the vertical direction, A rolling force in the X-axis direction, which is the axial direction of 8, is generated in the rolling portion, and the rolling force in the width direction of the ring-shaped material 8 is always reduced while being applied to the ring-shaped material 8. The reason why the rolling force is generated in the width direction is that the main shaft 4 of the forming roll 2 is inclined from the horizontal. Therefore, if the main shaft 4 of the forming roll 2 is horizontal, no rolling force in the width direction of the ring-shaped material 8 is generated. In this vertical ring rolling device 1, since the rolling force in the width direction on the ring-shaped material 8 is continuously present, the ring-shaped material 8 between the two forming rolls 2 and 2 in contact with each other in the X axis direction Deformability to deform is improved. Therefore, it is possible to manufacture the ring-shaped product 9 having a more complicated cross-sectional shape.

ここで、縦型リングローリング装置１による従来のリングローリング方法について説明する。先ず、図３の部分拡大図である図４では、軸方向断面の表面形状が複雑形状部に形成されるリング状素材８の外周面に、複雑形状部を成形する成形ロール２ａと単純形状部を成形する成形ロール２ｂの２本のロールがそれぞれ回転軸である主軸４を傾斜して対称に配置されてリング状素材８に当接されている。さらにリング状素材８のリング内には、リング状素材８の内周面にマンドレル５が当接して配置され、複雑形状部を成形する成形ロール２ａおよび単純形状部を成形する成形ロール２ｂにより加圧されたリング状素材８をマンドレル５により内周面からサポートしている。さらにリング状素材８の外周面に当接の複雑形状部を成形する成形ロール２ａおよび単純形状部を成形する成形ロール２ｂのマンドレル５を対称にして反対側に位置するリング状素材８の外周面に軸孔６ｃで回転自在に軸支された１個の控ロール６が当接されてリング状素材８を保持している。すなわち、リング状素材８の複雑な表面形状部を反転した形状の複雑な表面形状部を有する控ロール６の部分とリング状素材８の簡単な表面形状部に反転した形状の簡単な表面形状部を有する控ロール６の部分とからなる一体型の控ロール６が配設されている。この場合、リング状素材８が複雑形状部を成形する成形ロール２ａおよび単純形状部を成形する成形ロール２ｂの２個のロールと、マンドレル５との間で加圧されて拡径されたリング状素材８の外周面を、複雑形状部と単純形状部からなる一体型の控ロール６の複数個で保持しながら従動して回転している。   Here, a conventional ring rolling method by the vertical ring rolling device 1 will be described. First, in FIG. 4 which is a partially enlarged view of FIG. 3, a forming roll 2a and a simple shape portion for forming the complex shape portion on the outer peripheral surface of the ring-shaped material 8 whose surface shape in the axial direction cross section is formed in the complex shape portion. The two rolls of the forming roll 2b are formed symmetrically with the main shaft 4 that is the rotation shaft inclined, and are in contact with the ring-shaped material 8. Further, in the ring of the ring-shaped material 8, the mandrel 5 is disposed in contact with the inner peripheral surface of the ring-shaped material 8, and is added by a forming roll 2 a for forming a complex shape portion and a forming roll 2 b for forming a simple shape portion. The pressed ring-shaped material 8 is supported from the inner peripheral surface by the mandrel 5. Further, the outer peripheral surface of the ring-shaped material 8 located on the opposite side with the mandrel 5 of the forming roll 2a for forming the complex shape portion in contact with the outer peripheral surface of the ring-shaped material 8 and the forming roll 2b for forming the simple shape portion symmetrical. One holding roll 6 rotatably supported by the shaft hole 6c is brought into contact with the ring hole 8c to hold the ring-shaped material 8. That is, a simple surface shape portion having a shape reversed to a simple surface shape portion of the ring-shaped material 8 and a portion of the holding roll 6 having a complicated surface shape portion having a shape obtained by inverting the complicated surface shape portion of the ring-shaped material 8. An integral type holding roll 6 composed of a portion of the holding roll 6 having the above is disposed. In this case, the ring-shaped material 8 is pressed between the two rolls of the forming roll 2a for forming the complex shape portion and the forming roll 2b for forming the simple shape portion, and the mandrel 5, and the ring shape is expanded in diameter. The outer peripheral surface of the raw material 8 is driven and rotated while being held by a plurality of integral-type holding rolls 6 each having a complicated shape portion and a simple shape portion.

次いで、この縦型リングローリング装置１により成形する軸方向断面の表面形状が複雑な形状部と単純形状部を有するリング状製品９を形成する方法について、例えばベアリングの内輪レースを用いて説明する。このテーパーベアリングの内輪レースでは、図４に示すように、その軸方向の外周面は複雑な形状部と単純形状部からなっている。したがって、これらの内輪レースの外周面と当接する控ロール６の軸方向の外周面である表面形状も、複雑形状部６ａの部分と単純形状部６ｂの部分とからなるものである。ところで、これらの控ロール６の複雑形状部６ａの表面部分と単純形状部６ｂの表面部分は、それぞれがリング状製品９の外表面と接して従動して回転しており、しかも、それぞれの部分の回転半径に差異があるので、すなわち、控ロール６の複雑形状部６ａの回転半径は単純形状部６ｂの回転半径に比して大径であるので、このために、控ロール６が回転するとき、控ロール６の複雑形状部６ａの周速度と控ロール６の単純形状部６ｂの周速度の間にずれが生じる。そのために複雑形状部６ａと単純形状部６ｂを有する控ロール６を一体からなるものを用いてリングローリングすると、リング状製品９の複雑形状部と単純形状部の間に回転速度の差異に基づくねじれ力がリング状製品９の表面に作用してムシレ疵を発生することとなる。   Next, a method for forming a ring-shaped product 9 having a shape portion having a complicated surface shape in the axial direction and a simple shape portion formed by the vertical ring rolling device 1 will be described using an inner race of a bearing, for example. In the inner race of this tapered bearing, as shown in FIG. 4, the outer peripheral surface in the axial direction is composed of a complicated shape portion and a simple shape portion. Therefore, the surface shape that is the outer peripheral surface in the axial direction of the holding roll 6 that comes into contact with the outer peripheral surface of these inner races is also composed of the complex shape portion 6a and the simple shape portion 6b. By the way, the surface portion of the complicated shape portion 6a and the surface portion of the simple shape portion 6b of these holding rolls 6 are rotated in contact with the outer surface of the ring-shaped product 9, and the respective portions are rotated. That is, since the rotation radius of the complicated shape portion 6a of the holding roll 6 is larger than the rotation radius of the simple shape portion 6b, the holding roll 6 rotates for this reason. At this time, a deviation occurs between the peripheral speed of the complicated shape portion 6 a of the retaining roll 6 and the peripheral speed of the simple shape portion 6 b of the retaining roll 6. For this purpose, when ring rolling is performed using the roll 6 having the complicated shape portion 6a and the simple shape portion 6b, the twist based on the difference in rotational speed between the complex shape portion and the simple shape portion of the ring-shaped product 9 is obtained. The force acts on the surface of the ring-shaped product 9 to generate mussels.

そこで、本発明では、リング状製品９の表面にムシレ疵の発生を無くすために、控ロール６を、図１の（ａ）に示す従来の一体型の軸孔６ｃで軸支された控ロール６から、図１の（ｂ）に示すように複雑形状部６ａと、単純形状部６ｂに分割し、２体からなる控ロール６とするものである。このように複雑形状部６ａと単純形状部６ｂの別体である２体からなる控ロール６とすることで、控ロール６の複雑形状部６ａの表面の回転による周速度と、控ロール６の単純形状部６ｂの表面の回転による周速度を相違するものとすることができる。このことによりリング状製品９の複雑形状部と単純形状部との間のねじれ力の発生が弱められる結果、ムシレ疵の無いリング状製品９がリングローリングにより成形できる。   Therefore, in the present invention, in order to eliminate the occurrence of creaking on the surface of the ring-shaped product 9, the retaining roll 6 is supported by a conventional integral shaft hole 6c shown in FIG. 6, as shown in FIG. 1 (b), it is divided into a complex shape portion 6 a and a simple shape portion 6 b to form a two-piece cutting roll 6. Thus, by setting it as the holding roll 6 which consists of two bodies which are the separate parts of the complicated shape part 6a and the simple shape part 6b, the peripheral speed by rotation of the surface of the complicated shape part 6a of the holding roll 6, and the holding roll 6 The peripheral speed by rotation of the surface of the simple shape part 6b can be made different. As a result, the generation of the twisting force between the complicated shape portion and the simple shape portion of the ring-shaped product 9 is weakened, and as a result, the ring-shaped product 9 without mussel can be formed by ring rolling.

控ロールを示す図で、（ａ）は一体型の控ロール、（ｂ）は本発明における分割型の控ロールの断面図である。It is a figure which shows a holding roll, (a) is an integrated type holding roll, (b) is sectional drawing of the division type holding roll in this invention. 縦型リングローリング装置の模式的図面である。1 is a schematic drawing of a vertical ring rolling device. 縦型リングローリング装置の成形ロールの主軸の傾きを示す図である。It is a figure which shows the inclination of the main axis | shaft of the forming roll of a vertical ring rolling apparatus. 成形ロール、マンドレルおよび控ロールによるリング状素材の成形状態を示す図である。It is a figure which shows the shaping | molding state of the ring-shaped raw material by a forming roll , a mandrel, and a holding roll.

符号の説明Explanation of symbols

１ 縦型ローリング装置
２ 成形ロール
２ａ 複雑形状部を成形する成形ロール
２ｂ 単純形状部を成形する成形ロール
２ｃ 当接部
２ｄ 断面形状
３ 主軸箱
４ 主軸
５ マンドレル
６ 控ロール
６ａ 複雑形状部
６ｂ 単純形状部
６ｃ 軸孔
７ ロールブロック
８ リング状素材
８ａ 外周面
９ リング状製品
９ａ 断面形状 DESCRIPTION OF SYMBOLS 1 Vertical type rolling apparatus 2 Forming roll 2a Forming roll which shape | molds a complicated shape part 2b Forming roll which shape | molds a simple shape part 2c Contact part 2d Cross-sectional shape 3 Spindle box 4 Spindle 5 Mandrel 6 Holding roll 6a Complex shape part 6b Simple shape Part 6c Shaft hole 7 Roll block 8 Ring-shaped material 8a Outer peripheral surface 9 Ring-shaped product 9a Cross-sectional shape

Claims (1)

成形ロールとマンドレル間にリング状素材を挟持し、マンドレルを挿通したリング状素材に対向して成形ロールと控ロールを対称に配置し、成形ロールと控ロールによりリング状素材の外周面を保持してリングローリングによりリング状製品を製造する製造方法において、リング状素材の軸方向断面の表面を小径部から順次異なる拡径部となる円筒表面形状で周速度が軸方向で異なる複数の曲線で形成の複雑形状部と単一直線で形成の単純形状部からなる形成面とし、さらに控ロールの軸方向断面の表面を小径部から順次異なる拡径部となる円筒表面形状で周速度が軸方向で異なる複数の曲線で形成の複雑形状部と円筒表面の周速度が軸方向で一定である同径の円筒表面の単一直線で形成の単純形状部からなる表面とし、かつ、これらの控ロールを複雑形状部と単純形状部の境界で分割して控ロールの複雑形状部と控ロールの単純形状部を別体からなるものとし、リング状素材の複雑形状部の形成面の周速に控ロールの複雑形状部の表面の周速を合致させて転動させ、かつ、リング状素材の単純形状部の形成面の周速に控ロールの単純形状部の表面の周速を合致させて転動させることを特徴とする軸方向断面の表面形状が複雑なリング状製品のムシレ疵の発生をなくしたリングローリング方法。 A ring-shaped material is sandwiched between the forming roll and the mandrel, the forming roll and the holding roll are placed symmetrically facing the ring-shaped material inserted through the mandrel, and the outer surface of the ring-shaped material is held by the forming roll and the holding roll. In the manufacturing method for manufacturing ring-shaped products by ring rolling, the surface of the ring-shaped cross section in the axial direction is formed by a plurality of curves whose peripheral speeds are different from each other in the axial direction with a cylindrical surface shape that gradually increases from a small diameter portion complex-shaped part and the forming surface consisting of a simple shape of the formed single straight line, the peripheral velocity is different in the axial direction yet the surface of the axial section of the copy roll cylindrical surface shape which is successively different diameter portion of the small diameter portion of the a plurality of peripheral speed of the complicated shape portion and the cylindrical surface of the curve formed is made of a simple shape of the formed single straight cylindrical surface of the same diameter which is constant in the axial surface, and these Hikaero The complicated shape part of the retaining roll and the simple shape part of the retaining roll are separated from each other at the boundary between the complex shape part and the simple shape part, and the peripheral speed of the complex shaped part forming surface of the ring-shaped material is adjusted. Roll by matching the circumferential speed of the surface of the complicated shape part of the holding roll, and match the circumferential speed of the surface of the simple shape part of the holding roll with the circumferential speed of the surface of the simple shape part of the ring-shaped material. A ring rolling method that eliminates the occurrence of mussels in a ring-shaped product having a complicated surface shape in the axial cross section, characterized by rolling.
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