JP5803281B2 - Manufacturing method of split race - Google Patents

Manufacturing method of split race Download PDF

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JP5803281B2
JP5803281B2 JP2011119487A JP2011119487A JP5803281B2 JP 5803281 B2 JP5803281 B2 JP 5803281B2 JP 2011119487 A JP2011119487 A JP 2011119487A JP 2011119487 A JP2011119487 A JP 2011119487A JP 5803281 B2 JP5803281 B2 JP 5803281B2
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jig
raceway
axial direction
inner diameter
inner ring
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JP2012247009A (en
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松井　雅人
雅人 松井
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NSK Ltd
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Priority to CN201280000443.XA priority patent/CN102782351B/en
Priority to PCT/JP2012/054445 priority patent/WO2012115201A1/en
Priority to US13/877,067 priority patent/US8956055B2/en
Priority to EP12749401.1A priority patent/EP2679844A4/en
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本発明は、分割軌道輪の製造方法に関する。   The present invention relates to a method for manufacturing a split race ring.

図１に示されるような鉄鋼用の圧延ロール１は、その軸方向端部２でサポート軸受３により支持されると共に、軸方向内側の小径部４において二つ割り軸受１０により支持される。小径部４の軸方向両側には大径部５が位置しているため、二つ割り軸受１０を取り付ける際には、内輪を円周方向で少なくとも二つに分割した分割輪のそれぞれを、小径部４の外径側からそれぞれ取り付けた後、分割輪同士をボルト等により結合する必要がある。   A rolling roll 1 for steel as shown in FIG. 1 is supported by a support bearing 3 at an axial end 2 thereof, and is supported by a split bearing 10 at a small diameter portion 4 on the inner side in the axial direction. Since the large-diameter portions 5 are located on both axial sides of the small-diameter portion 4, when the split bearing 10 is attached, each of the split rings obtained by dividing the inner ring into at least two portions in the circumferential direction is divided into the small-diameter portions 4. After being attached from the outer diameter side of each, it is necessary to join the split wheels with bolts or the like.

このように円周方向に二つに分割された軌道輪を得るため、従来、軌道輪の軸方向一方端部にノッチ部およびスリットを設けると共に、このノッチ部に工具の刃先を押し込んで自然割りすることにより、軌道輪の分割を行っている（例えば、特許文献１参照）。   In order to obtain a raceway ring that is divided into two in the circumferential direction in this way, conventionally, a notch portion and a slit are provided at one end in the axial direction of the raceway ring, and the cutting edge of the tool is pushed into the notch portion to naturally divide the raceway ring. By doing so, the races are divided (for example, see Patent Document 1).

上記した方法では、軸方向の荷重により軌道輪が分割されるが、軸方向一方側のみから荷重を受けるため、軌道輪が変形し、軌道面の真円度が低下してしまうという問題があった。そこで、図８に示すように、軌道輪１１１の軸方向両端部に不図示のスリットを設け、柱１４１、１４２により長手方向両端部が支持された冶具１３０を、軌道輪１１１の内径側に挿入し、スリット上に外径側からブロック１４８を載せて押圧装置１４９により上側から圧力を加え、軸方向両側のスリットから亀裂を進展させることにより、軌道輪１１１を分割することが提案されている。   In the above method, the raceway ring is divided by the axial load, but since the load is received only from one side in the axial direction, there is a problem that the raceway is deformed and the roundness of the raceway surface is lowered. It was. Therefore, as shown in FIG. 8, slits (not shown) are provided at both ends in the axial direction of the bearing ring 111, and the jig 130 whose longitudinal ends are supported by the columns 141 and 142 is inserted into the inner diameter side of the bearing ring 111. Then, it has been proposed to divide the raceway ring 111 by placing a block 148 on the slit from the outer diameter side, applying pressure from the upper side by a pressing device 149, and causing cracks to propagate from the slits on both sides in the axial direction.

特許第４０４２９９９号Patent No. 4042999

ところで、軌道輪の強度を向上するために軌道輪に浸炭処理が施された場合、表面は硬化されているが、内部は表面と比べて柔らかい状態のままとなる。特にこのような場合には、軸方向両側のスリットから亀裂を進展させて軌道輪を分割したとき、亀裂が進行する方向がそれぞれ定まらないために亀裂が合流点で一致せず、切断面が乱れて段差が生じるおそれがある。段差が生じると、圧延ロール等に軌道輪を組み込むときに内輪軌道面の真円度が悪下するおそれがある。   By the way, when the carburizing process is performed on the bearing ring in order to improve the strength of the bearing ring, the surface is hardened, but the inside remains softer than the surface. In particular, in such a case, when the raceway is divided by extending cracks from the slits on both sides in the axial direction, the cracks do not coincide with each other because the directions in which the cracks progress are not determined, and the cut surface is disturbed. There is a risk of unevenness. If a step is generated, the roundness of the inner ring raceway surface may be degraded when the raceway is incorporated into a rolling roll or the like.

本発明は上記事情に鑑みてなされたものであり、分割軌道輪の切断面の乱れを抑制し、軌道面の真円度を良好なものとすることができる分割軌道輪の製造方法を提供することを目的とする。   The present invention has been made in view of the above circumstances, and provides a method of manufacturing a split raceway ring that can suppress the disorder of the cut surface of the split raceway ring and improve the roundness of the raceway surface. For the purpose.

本発明の上記目的は、下記の構成により達成される。
（１） 軌道輪の内径側に略多角柱形状の冶具を挿入する工程と、
前記冶具の軸方向一方端部を第１支持部により支持する工程と、
前記冶具の軸方向他方端部を第２支持部により支持する工程と、
前記冶具の上縁部により前記軌道輪の内径面を担持する工程と、
前記軌道輪に軌道輪の径方向から荷重を加えることにより前記軌道輪を円周方向に分割する工程と、を有する分割軌道輪の製造方法であって、
前記軸方向一方端部側における前記冶具の上縁部と前記軌道輪の内径面との間の接触面圧は、前記軸方向他方端部側における前記冶具の上縁部と前記軌道輪の内径面との間の接触面圧よりも高くなるように、前記軸方向一方端部側と前記軸方向他方端部側の両側に荷重が加えられることを特徴とする分割軌道輪の製造方法。
（２） 前記冶具は、前記軸方向一方端部において、前記軸方向他方端部よりも垂直方向に高い位置で支持されることを特徴とする上記（１）記載の分割軌道輪の製造方法。
（３） 前記冶具の上縁部と前記軌道輪の内径面との接触角度が０．５°を超え、且つ１．５°未満であることを特徴とする上記（１）または（２）記載の分割軌道輪の製造方法。
（４） 前記冶具が略直方体形状であり、前記冶具の径方向断面の水平方向寸法が垂直方向寸法よりも大きいことを特徴とする上記（１）〜（３）のいずれか１つに記載の分割軌道輪の製造方法。 The above object of the present invention can be achieved by the following constitution.
(1) inserting a substantially polygonal column-shaped jig on the inner diameter side of the race,
A step of supporting one end of the jig in the axial direction by a first support portion;
A step of supporting the other end portion in the axial direction of the jig by a second support portion;
Carrying the inner diameter surface of the raceway by the upper edge of the jig;
Dividing the raceway in a circumferential direction by applying a load from the radial direction of the raceway to the raceway ,
The contact surface pressure between the upper edge of the jig on the one end side in the axial direction and the inner diameter surface of the bearing ring is the inner diameter of the upper edge of the jig on the other end side in the axial direction and the inner diameter of the bearing ring. the higher due so than the contact surface pressure between the surfaces, method of producing segmented bearing ring, characterized in that the load is applied to the axial direction one end portion side on both sides of the axial direction other end side.
(2) The method according to (1), wherein the jig is supported at a position higher in a vertical direction than the other end in the axial direction at the one end in the axial direction.
(3) The said (1) or (2) description characterized by the contact angle of the upper edge part of the said jig and the internal diameter surface of the said bearing ring being more than 0.5 degree and less than 1.5 degree. Manufacturing method for split raceway.
(4) the jig has a substantially rectangular parallelepiped shape, the horizontal dimension of the radial cross section of the jig is equal to or greater than the vertical dimension (1) to according to any one of (3) A method of manufacturing a split race.

本発明の分割軌道輪の製造方法によれば、分割軌道輪の切断面の乱れを抑制し、軌道面の真円度を良好なものとすることができる。   According to the method for manufacturing a split race ring of the present invention, it is possible to suppress the disorder of the cut surface of the split race ring and improve the roundness of the raceway surface.

鉄鋼用の圧延ロールの一例を示す概略図である。It is the schematic which shows an example of the rolling roll for steel. 本発明の一実施形態に係る分割軌道輪の製造方法を示す概略正面図である。It is a schematic front view which shows the manufacturing method of the division | segmentation track ring which concerns on one Embodiment of this invention. 図２の側面図である。FIG. 3 is a side view of FIG. 2. 本発明の一実施形態に係る分割軌道輪の製造方法において、接触角度が０°の場合と０．５°の場合の亀裂の進展方向を示す図である。In the manufacturing method of the split race ring concerning one embodiment of the present invention, it is a figure showing the progress direction of a crack in case a contact angle is 0 degrees and 0.5 degrees. 本発明の一実施形態に係る分割軌道輪の製造方法において、接触角度が１．０°の場合と１．５°の場合の亀裂の進展方向を示す図である。In the manufacturing method of the division | segmentation track ring which concerns on one Embodiment of this invention, it is a figure which shows the propagation direction of the crack in case the contact angle is 1.0 degree and 1.5 degrees. 本発明の一実施形態に係る分割軌道輪の製造方法において、接触角度が１．０°の場合の、内輪の内径面と冶具との接触範囲と、その接触面圧を示す図である。In the manufacturing method of the division raceway ring concerning one embodiment of the present invention, when a contact angle is 1.0 degrees, it is a figure showing a contact range of an inner diameter surface of an inner ring and a jig, and its contact surface pressure. 本発明の一実施形態に係る分割軌道輪の製造方法において、接触角度が１．５°の場合の、内輪の内径面と冶具との接触範囲と、その接触面圧を示す図である。In the manufacturing method of the split raceway ring concerning one embodiment of the present invention, when a contact angle is 1.5 degrees, it is a figure showing a contact range of an inner diameter side of an inner ring and a jig, and its contact surface pressure. 従来の分割軌道輪の製造方法を示す概略正面図である。It is a schematic front view which shows the manufacturing method of the conventional division | segmentation track ring.

以下、本発明に係る分割軌道輪の製造方法の実施形態を、図面に基づいて詳細に説明する。   Hereinafter, an embodiment of a method for manufacturing a split race according to the present invention will be described in detail with reference to the drawings.

図２、図３に示されるように、本実施形態に係る分割軌道輪の製造方法においては、底面３１、頂面３２、側面３３，３３を備える略直方体形状の冶具３０が、円筒状の内輪１１の内径側に挿入される。冶具３０の底面３１は、第１軸方向端部３６側において板４３を介して第１の柱４１により、第２軸方向端部３７側において第２の柱４２により支持される。第１の柱４１と第２の柱４２の垂直方向寸法は同等であり、冶具３０は、第１軸方向端部３６側において、板４３の垂直方向寸法分だけ第２軸方向端部３７側よりも垂直方向に高い位置に配置される。第１の柱４１および第２の柱４２の高さは、内輪１１が冶具３０により吊持されるような寸法であれば任意の寸法でよい。   As shown in FIGS. 2 and 3, in the method of manufacturing a split race ring according to the present embodiment, a substantially rectangular parallelepiped jig 30 having a bottom surface 31, a top surface 32, and side surfaces 33, 33 is a cylindrical inner ring. 11 is inserted into the inner diameter side. The bottom surface 31 of the jig 30 is supported by the first column 41 via the plate 43 on the first axial end portion 36 side and by the second column 42 on the second axial end portion 37 side. The vertical dimensions of the first pillar 41 and the second pillar 42 are the same, and the jig 30 is on the second axial end 37 side by the vertical dimension of the plate 43 on the first axial end 36 side. It is arranged at a higher position in the vertical direction. The height of the first pillar 41 and the second pillar 42 may be any dimension as long as the inner ring 11 is suspended by the jig 30.

図２、３に示されるように、内輪１１は、環状の胴部１２と、胴部１２の軸方向両側に配置された環状の鍔部１３，１３と、内輪１１の軸方向両端に配置された端部１４，１４と、を備える。胴部１２の外径面は、不図示の転動体の軌道面となる。内輪１１を割りやすくするために、端部１４には軸方向に延びるスリット１７ａ、１７ｂが設けられている。スリット１７ａ，１７ｂは、軸方向両側で直線上に位置するよう設けられている。また、これらスリット１７ａ，１７ｂが設けられた位置から円周方向に１８０°回転させた位置においても、スリット１７ａ’，１７ｂ’が端部１４に設けられている。   As shown in FIGS. 2 and 3, the inner ring 11 is disposed at an annular body 12, annular flanges 13 and 13 disposed on both sides in the axial direction of the body 12, and both ends in the axial direction of the inner ring 11. End portions 14 and 14. The outer diameter surface of the body portion 12 is a raceway surface of a rolling element (not shown). In order to make it easy to split the inner ring 11, the end portion 14 is provided with slits 17a and 17b extending in the axial direction. The slits 17a and 17b are provided on a straight line on both sides in the axial direction. The slits 17a 'and 17b' are also provided at the end portion 14 at a position rotated 180 ° in the circumferential direction from the position where the slits 17a and 17b are provided.

内輪１１を割る際には、内径側に挿入された冶具３０によって、スリット１７ａ，１７ｂが垂直方向上方に位置するように内輪１１が吊持される。内輪１１は、スリット１７ａが冶具３０の第１軸方向端部３６側に、スリット１７ｂが冶具３０の第２軸方向端部３７側に位置するように配置される。前述したように、冶具３０は、第１軸方向端部３６側が第２軸方向端部３７側よりも高い位置に配置されている。したがって、冶具３０の頂面３２は水平面に対して傾斜しており、内輪１１の内径面を支持する上縁部３４、３４もまた水平面に対して傾斜し、第１軸方向端部３６側が第２軸方向端部３７側よりも高くなっている。この状態で、内輪１１の鍔部１３、１３の上に、スリット１７ａ、１７ｂに隣接させて直方体のブロック４８を置き、押圧装置４９によりブロック４８の垂直方向上方から内輪１１に荷重を加える。これにより、ブロック４８の下面４７を介して内輪１１の軸方向両側に、垂直方向上方から荷重が加えられる。荷重が加えられると、ブロック４８の下面４７と内輪１１は押圧装置４９の下面５０にならうため、冶具３０の上縁部３４は、内輪１１の内径面に対して斜めに接触することとなり、冶具３０の上縁部３４と内輪１１の内径面との間の接触面圧は、スリット１７ａ側において大きく、スリット１７ｂ側において小さくなっている。   When the inner ring 11 is broken, the inner ring 11 is suspended by the jig 30 inserted on the inner diameter side so that the slits 17a and 17b are positioned vertically upward. The inner ring 11 is disposed such that the slit 17 a is positioned on the first axial end portion 36 side of the jig 30 and the slit 17 b is positioned on the second axial end portion 37 side of the jig 30. As described above, the jig 30 is disposed at a position where the first axial end portion 36 side is higher than the second axial end portion 37 side. Therefore, the top surface 32 of the jig 30 is inclined with respect to the horizontal plane, the upper edge portions 34 and 34 that support the inner diameter surface of the inner ring 11 are also inclined with respect to the horizontal plane, and the first axial end 36 side is the first side. It is higher than the biaxial end 37 side. In this state, a rectangular parallelepiped block 48 is placed on the flanges 13 and 13 of the inner ring 11 so as to be adjacent to the slits 17a and 17b, and a load is applied to the inner ring 11 from above the block 48 in the vertical direction by the pressing device 49. Thereby, a load is applied from above in the vertical direction to both sides in the axial direction of the inner ring 11 via the lower surface 47 of the block 48. When a load is applied, the lower surface 47 of the block 48 and the inner ring 11 follow the lower surface 50 of the pressing device 49, so that the upper edge 34 of the jig 30 comes into contact with the inner surface of the inner ring 11 at an angle, The contact surface pressure between the upper edge 34 of the jig 30 and the inner diameter surface of the inner ring 11 is large on the slit 17a side and small on the slit 17b side.

この状態で、内輪１１の鍔部１３、１３の上に、スリット１７ａ、１７ｂに隣接させて直方体のブロック４８を置き、押圧装置４９によりブロック４８の垂直方向上方から内輪１１に荷重を加える。これにより、ブロック４８の下面４７を介して内輪１１の軸方向両側に、垂直方向上方から荷重が加えられるが、スリット１７ａ側において加えられる荷重の方がスリット１７ｂ側において加えられる荷重よりも大きくなるため、スリット１７ａからのみ亀裂を進展させることが可能となる。   In this state, a rectangular parallelepiped block 48 is placed on the flanges 13 and 13 of the inner ring 11 so as to be adjacent to the slits 17a and 17b, and a load is applied to the inner ring 11 from above the block 48 in the vertical direction by the pressing device 49. As a result, a load is applied to the both sides in the axial direction of the inner ring 11 via the lower surface 47 of the block 48 from above in the vertical direction, but the load applied on the slit 17a side is larger than the load applied on the slit 17b side. Therefore, it is possible to propagate the crack only from the slit 17a.

ここで、冶具３０の上縁部３４と内輪１１の内径面が接触する角度（接触角度）は、０．５°を超え、且つ１．５°未満であると好ましい。この接触角度が１．５°以上と大きくなりすぎると、スリット１７ａ側のみに極端に大きな荷重がかかるため、内輪１１の内径面や外径面に高い応力が発生して破損するおそれがあり、また内輪１１の内径面に傷がつくおそれがある。一方、接触角度が０．５°以下と小さすぎると、スリット１７ａ、１７ｂの両方から亀裂が進展するため、切断面で段差が生じ、真円度が悪化してしまうおそれがある。接触角度は１°程度であると更に好ましい。接触角度が１°程度である場合には、スリット１７ａ、１７ｂの両側に荷重が加えられると共に、スリット１７ａ側のみから亀裂を進展させることができるので、切断面に段差を生じさせることなく、内輪１１の変形を抑止して、内輪１１の軌道面の真円度を良好なものとすることができる。   Here, the angle (contact angle) at which the upper edge portion 34 of the jig 30 and the inner diameter surface of the inner ring 11 are in contact is preferably more than 0.5 ° and less than 1.5 °. If this contact angle is too large, 1.5 ° or more, an extremely large load is applied only to the slit 17a side, so there is a risk that high stress is generated on the inner diameter surface or outer diameter surface of the inner ring 11 and is damaged. Further, the inner diameter surface of the inner ring 11 may be damaged. On the other hand, if the contact angle is too small at 0.5 ° or less, cracks develop from both the slits 17a and 17b, so that a step is generated at the cut surface, and the roundness may be deteriorated. The contact angle is more preferably about 1 °. When the contact angle is about 1 °, a load is applied to both sides of the slits 17a and 17b and a crack can be propagated only from the slit 17a side. 11 can be suppressed, and the roundness of the raceway surface of the inner ring 11 can be improved.

スリット１７ａからスリット１７ｂまで内輪１１が割れた後には、内輪１１を円周方向に１８０°回転させて押圧装置４９によりスリット１７ａ’、１７ｂ’側から再度荷重を加えることによって、内輪１１を二分割することができる。   After the inner ring 11 is cracked from the slit 17a to the slit 17b, the inner ring 11 is divided into two parts by rotating the inner ring 11 180 ° in the circumferential direction and applying a load again from the slits 17a ′ and 17b ′ by the pressing device 49. can do.

本実施形態において、冶具３０は略直方体形状に形成されており、第１の柱４１や板４３により第１軸方向端部３６を、第２の柱４２により第２軸方向端部３７により支持すると共に、上縁部３４で内輪１１を吊持するのみであるので、第１の柱４１や板４３、第２の柱４２の寸法を変更等することによって、様々な寸法の内輪１１に適用することが可能である。   In this embodiment, the jig 30 is formed in a substantially rectangular parallelepiped shape, and is supported by the first column 41 and the plate 43 by the first axial end portion 36 and by the second column 42 by the second axial end portion 37. In addition, since the inner ring 11 is only suspended by the upper edge portion 34, it can be applied to the inner ring 11 having various dimensions by changing the dimensions of the first column 41, the plate 43, and the second column 42. Is possible.

ここで、内輪１１の内径面と冶具３０との接点（上縁部３４）と、内輪１１が荷重される部分（鍔部１３）との間の水平距離が長いほどモーメントが大きくなるため、より小さい荷重により内輪１１を割ることができるようになる。このため、冶具３０の径方向断面形状は横長の長方形形状であると好ましく、垂直方向寸法が小さくなりすぎることにより冶具３０に大きな応力が発生しない範囲内で、垂直方向寸法に対する水平方向寸法ができるだけ大きいことが好ましい。   Here, the moment increases as the horizontal distance between the contact point (upper edge portion 34) between the inner diameter surface of the inner ring 11 and the jig 30 and the portion to which the inner ring 11 is loaded (the flange portion 13) increases. The inner ring 11 can be broken by a small load. For this reason, the radial cross-sectional shape of the jig 30 is preferably a horizontally long rectangular shape, and the horizontal dimension relative to the vertical dimension can be as much as possible within a range in which a large stress is not generated in the jig 30 due to the vertical dimension becoming too small. Larger is preferred.

また、内輪１１を割る際に、冶具３０の上縁部３４と内輪１１の内径面との間の接触圧力が過大になると、冶具３０の上縁部３４により、内輪１１の内径面に傷をつけてしまうおそれがある。そこで、本実施形態においては、冶具３０の上縁部３４、３４に、軸方向にわたって延びる円弧部３５，３５が形成されている。種々のサイズの内輪１１に適用可能とするために、円弧部３５，３５の曲率半径は、冶具３０によって分割される内輪１１のうち、最も小さい内輪の内径よりも僅かに小さく設定される。円弧部３５，３５の曲率半径は一定である必要はなく、冶具３０の頂面３２との境界をなだらかに接続するように形成されていてもよい。これにより、押圧装置４９により内輪１１に荷重がかけられたときに、内輪１１の内径面と接触する面積を大きくして、内輪１１の内径面にかかる力を緩和することができる。また、円弧部は、冶具３０の軸方向にわたって形成される必要はなく、内輪１１の内径面と接触する範囲のみに形成されてもよい。   When the inner ring 11 is cracked, if the contact pressure between the upper edge portion 34 of the jig 30 and the inner diameter surface of the inner ring 11 becomes excessive, the upper edge portion 34 of the jig 30 damages the inner diameter surface of the inner ring 11. There is a risk of wearing. Therefore, in the present embodiment, arc portions 35 and 35 extending in the axial direction are formed on the upper edges 34 and 34 of the jig 30. In order to be applicable to the inner ring 11 of various sizes, the radius of curvature of the arc portions 35 and 35 is set to be slightly smaller than the inner diameter of the smallest inner ring among the inner rings 11 divided by the jig 30. The radii of curvature of the arc portions 35 and 35 do not have to be constant, and may be formed so as to smoothly connect the boundary with the top surface 32 of the jig 30. Thereby, when a load is applied to the inner ring 11 by the pressing device 49, the area in contact with the inner diameter surface of the inner ring 11 can be increased, and the force applied to the inner diameter surface of the inner ring 11 can be reduced. Further, the arc portion does not need to be formed over the axial direction of the jig 30 and may be formed only in a range in contact with the inner diameter surface of the inner ring 11.

本実施形態において、冶具３０は、機械構造用炭素鋼により形成される。押圧装置４９により加えられる荷重が大きくなり、上縁部３４と内輪１１の内径面との間の接触圧力が大きくなった場合には、内輪１１の内径面に傷がつくおそれがあるため、内輪１１の内径面と当たる冶具３０の頂面３２および上縁部３４側は、内輪１１の内径面よりも先に変形するような硬さに形成されることが好ましい。これにより、冶具３０が内輪１１の内径面よりも先に変形するので、内輪１１の内径面に傷がつくことや、内輪１１が変形して内径面の真円度が悪化することを防止することができる。   In the present embodiment, the jig 30 is made of carbon steel for machine structure. When the load applied by the pressing device 49 increases and the contact pressure between the upper edge portion 34 and the inner surface of the inner ring 11 increases, the inner surface of the inner ring 11 may be damaged. It is preferable that the top surface 32 and the upper edge 34 side of the jig 30 that contacts the inner diameter surface of the eleventh are formed to have a hardness that deforms earlier than the inner diameter surface of the inner ring 11. Thereby, since the jig 30 is deformed before the inner diameter surface of the inner ring 11, it is possible to prevent the inner diameter surface of the inner ring 11 from being damaged and the inner ring 11 from being deformed to deteriorate the roundness of the inner diameter surface. be able to.

また、内輪１１を割るために荷重を加えると、この荷重によって冶具３０が下向きに変形し、冶具３０の底面３１側に高い応力が発生して破損するおそれがある。そこで、冶具３０の底面３１側のみに熱処理（焼入れ）を施して底面３１を硬化し、強度を向上するとさらに好ましい。   Further, when a load is applied to break the inner ring 11, the jig 30 is deformed downward by this load, and a high stress may be generated on the bottom surface 31 side of the jig 30 to be damaged. Therefore, it is more preferable that heat treatment (quenching) is performed only on the bottom surface 31 side of the jig 30 to harden the bottom surface 31 to improve the strength.

このように、本実施形態の分割軌道輪の製造方法によれば、スリット１７ａ、１７ｂの両側に荷重が加えられることにより、内輪１１の変形を防止することができ、軌道面の真円度を良好なものとすることができる。また、スリット１７ａ側のみから亀裂を進展させることができるので、切断面に段差を生じさせることなく、内輪１１の変形を抑止して軌道面の真円度を良好なものとすることができる。   Thus, according to the manufacturing method of the split raceway ring of this embodiment, the load is applied to both sides of the slits 17a and 17b, so that the deformation of the inner race 11 can be prevented and the roundness of the raceway surface can be reduced. It can be good. Further, since the crack can be propagated only from the slit 17a side, the roundness of the raceway surface can be improved by suppressing the deformation of the inner ring 11 without causing a step in the cut surface.

尚、本発明は、前述した実施形態に限定されるものではなく、変更、改良等が適宜可能である。前述した実施形態では、内輪１１を分割する場合を例に挙げて説明したが、外輪を分割する場合であっても、本発明を適用することができる。また、前述した実施形態では、略直方体形状の冶具を例に挙げて説明したが、冶具は略水平な頂面を有する任意の多角柱形状であってよい。また、前述した実施形態では、軌道輪を二分割する場合を例に挙げて説明したが、軌道輪を三以上に分割してもよい。   In addition, this invention is not limited to embodiment mentioned above, A change, improvement, etc. are possible suitably. In the embodiment described above, the case where the inner ring 11 is divided has been described as an example, but the present invention can be applied even when the outer ring is divided. In the above-described embodiments, the jig having a substantially rectangular parallelepiped shape has been described as an example. However, the jig may have an arbitrary polygonal column shape having a substantially horizontal top surface. In the above-described embodiment, the case where the raceway is divided into two has been described as an example, but the raceway may be divided into three or more.

また、前述した実施形態では、第１の柱４１と冶具３０との間に板４３を挿入することによって、冶具３０の上縁部３４が内輪１１の内径面に対して斜めに接触させているが、板４３を挿入せずに、第１の柱４１の垂直方向寸法を第２の柱４２と異なるものとすることにより、冶具３０の上縁部３４を内輪１１の内径面に対して斜めに接触させてもよい。   In the above-described embodiment, the plate 43 is inserted between the first column 41 and the jig 30 so that the upper edge 34 of the jig 30 is in contact with the inner diameter surface of the inner ring 11 obliquely. However, by making the vertical dimension of the first column 41 different from that of the second column 42 without inserting the plate 43, the upper edge 34 of the jig 30 is inclined with respect to the inner diameter surface of the inner ring 11. You may make it contact.

また、板４３を用いずに、第１の柱４１と第２の柱４２の垂直方向寸法を同じにし、第１軸方向端部における垂直方向寸法が、第２軸方向端部における垂直方向寸法よりも大きい冶具を用いて、軌道輪を分割してもよい。このような場合でも、冶具の頂面は、第１軸方向端部において高く、第２軸方向端部において低い傾斜した形状となるので、冶具の上縁部を軌道輪の内径面に対して斜めに接触させることができる。   Also, the vertical dimensions of the first column 41 and the second column 42 are made the same without using the plate 43, and the vertical dimension at the first axial end is the vertical dimension at the second axial end. The race may be divided using a larger jig. Even in such a case, since the top surface of the jig has a shape that is high at the first axial end portion and low at the second axial end portion, the upper edge portion of the jig is set to the inner diameter surface of the bearing ring. Can be contacted at an angle.

ここで、上記した実施形態に係る分割軌道輪の製造方法について、板４３の垂直方向寸法を変更することにより内輪１１の内径面と冶具３０の上縁部３４との間の接触角度を０°、０．５°、１．０°、１．５°の４通りに変化させた場合の亀裂の進展方向等を、有限要素法（ＦＥＭ）により予測した。いずれの例においても、内輪１１の寸法は内径１１０ｍｍ、軸方向幅１５０ｍｍである。   Here, in the manufacturing method of the split raceway according to the above-described embodiment, the contact angle between the inner diameter surface of the inner ring 11 and the upper edge 34 of the jig 30 is changed to 0 ° by changing the vertical dimension of the plate 43. , 0.5 °, 1.0 °, and 1.5 ° were predicted by the finite element method (FEM). In any example, the inner ring 11 has an inner diameter of 110 mm and an axial width of 150 mm.

図４は、接触角度が０°の場合および０．５°の場合の、亀裂の進展方向を示す。図４から、接触角度が０°や０．５°である場合には、亀裂がスリット１７ａ、１７ｂの両側から進展することがわかる。このような場合には、亀裂が合流点で一致せず、切断面が乱れて段差が生じるおそれがあり、軌道面の真円度が悪下するおそれがある。   FIG. 4 shows the crack propagation direction when the contact angle is 0 ° and 0.5 °. From FIG. 4, it can be seen that when the contact angle is 0 ° or 0.5 °, the crack propagates from both sides of the slits 17a and 17b. In such a case, the cracks do not coincide at the confluence, the cut surface may be disturbed and a step may occur, and the roundness of the raceway surface may deteriorate.

図５は、接触角度が１．０°の場合および１．５°の場合の、亀裂の進展方向を示す。図５から、接触角度が１．０°や１．５°である場合には、亀裂がスリット１７ａ側のみから進展することがわかる。   FIG. 5 shows the crack growth direction when the contact angle is 1.0 ° and 1.5 °. FIG. 5 shows that when the contact angle is 1.0 ° or 1.5 °, the crack propagates only from the slit 17a side.

さらに、図６は、接触角度が１°の場合の、内輪１１の内径面と冶具３０の上縁部３４との間の接触面圧および接触範囲を示し、図７は、接触角度が１．５°の場合の、内輪１１の内径面と冶具３０の上縁部３４との間の接触面圧および接触範囲を示す。図６から、接触角度が１．０°の場合には、内輪１１の内径面と冶具３０の上縁部３４が、スリット１７ａからスリット１７ｂまで軸方向にわたって接触することがわかる。したがって、接触角度が１．０°の場合には、切断面に段差を生じさせることなく、内輪１１の変形を抑止して軌道面の真円度を良好なものとすることができる。   6 shows the contact surface pressure and the contact range between the inner diameter surface of the inner ring 11 and the upper edge 34 of the jig 30 when the contact angle is 1 °, and FIG. The contact surface pressure and contact range between the inner diameter surface of the inner ring 11 and the upper edge 34 of the jig 30 in the case of 5 ° are shown. From FIG. 6, it can be seen that when the contact angle is 1.0 °, the inner diameter surface of the inner ring 11 and the upper edge 34 of the jig 30 are in contact from the slit 17a to the slit 17b in the axial direction. Therefore, when the contact angle is 1.0 °, it is possible to suppress the deformation of the inner ring 11 without causing a step in the cut surface and to improve the roundness of the raceway surface.

これに対し、図７から、接触角度が１．５°の場合には、内輪１１の内径面と冶具３０の上縁部３４が、スリット１７ａから、軸方向の半分程度にわたってしか接触しないことがわかる。このような場合には、内輪１１の外径側から荷重を加えたときに内輪１１が不安定となり、内輪１１および冶具３０に大きな応力が発生し、破損するおそれがある。また、荷重がスリット１７ａ側のみから加えられることにより、内輪１１が変形し、軌道面の真円度が悪化するおそれがある。したがって、内輪１１の内径面と冶具３０の上縁部３４との間の接触角度が１．０°程度となるように、板４３または第１の柱４１の垂直方向寸法を設定することが好ましいことがわかる。   On the other hand, from FIG. 7, when the contact angle is 1.5 °, the inner diameter surface of the inner ring 11 and the upper edge 34 of the jig 30 may contact only about half of the axial direction from the slit 17a. Recognize. In such a case, when a load is applied from the outer diameter side of the inner ring 11, the inner ring 11 becomes unstable, and a large stress is generated in the inner ring 11 and the jig 30, which may cause damage. Moreover, when the load is applied only from the slit 17a side, the inner ring 11 may be deformed, and the roundness of the raceway surface may be deteriorated. Therefore, it is preferable to set the vertical dimension of the plate 43 or the first column 41 so that the contact angle between the inner diameter surface of the inner ring 11 and the upper edge portion 34 of the jig 30 is about 1.0 °. I understand that.

本発明は、鉄鋼用圧延ロール等を支持する二つ割り軸受の製造分野などにおいて好適に利用可能である。   INDUSTRIAL APPLICABILITY The present invention can be suitably used in the field of manufacturing a split bearing that supports a steel roll or the like.

１０ 二つ割り軸受
１１ 内輪
３０ 冶具
３４ 上縁部
４１ 第１の柱
４２ 第２の柱
４３ 板 10 split bearing 11 inner ring 30 jig 34 upper edge 41 first column 42 second column 43 plate

Claims (4)

軌道輪の内径側に略多角柱形状の冶具を挿入する工程と、
前記冶具の軸方向一方端部を第１支持部により支持する工程と、
前記冶具の軸方向他方端部を第２支持部により支持する工程と、
前記冶具の上縁部により前記軌道輪の内径面を担持する工程と、
前記軌道輪に軌道輪の径方向から荷重を加えることにより前記軌道輪を円周方向に分割する工程と、を有する分割軌道輪の製造方法であって、
前記軸方向一方端部側における前記冶具の上縁部と前記軌道輪の内径面との間の接触面圧は、前記軸方向他方端部側における前記冶具の上縁部と前記軌道輪の内径面との間の接触面圧よりも高くなるように、前記軸方向一方端部側と前記軸方向他方端部側の両側に荷重が加えられることを特徴とする分割軌道輪の製造方法。 Inserting a substantially polygonal column-shaped jig on the inner diameter side of the race,
A step of supporting one end of the jig in the axial direction by a first support portion;
A step of supporting the other end portion in the axial direction of the jig by a second support portion;
Carrying the inner diameter surface of the raceway by the upper edge of the jig;
Dividing the raceway in a circumferential direction by applying a load from the radial direction of the raceway to the raceway ,
The contact surface pressure between the upper edge of the jig on the one end side in the axial direction and the inner diameter surface of the bearing ring is the inner diameter of the upper edge of the jig on the other end side in the axial direction and the inner diameter of the bearing ring. the higher due so than the contact surface pressure between the surfaces, method of producing segmented bearing ring, characterized in that the load is applied to the axial direction one end portion side on both sides of the axial direction other end side. 前記冶具は、前記軸方向一方端部において、前記軸方向他方端部よりも垂直方向に高い位置で支持されることを特徴とする請求項１記載の分割軌道輪の製造方法。   The method of manufacturing a split raceway according to claim 1, wherein the jig is supported at a position higher in the vertical direction than the other end in the axial direction at the one end in the axial direction. 前記冶具の上縁部と前記軌道輪の内径面との接触角度が０．５°を超え、且つ１．５°未満であることを特徴とする請求項１または２記載の分割軌道輪の製造方法。   3. The split raceway ring according to claim 1, wherein a contact angle between an upper edge portion of the jig and the inner diameter surface of the raceway is greater than 0.5 ° and less than 1.5 °. Method. 前記冶具が略直方体形状であり、前記冶具の径方向断面の水平方向寸法が垂直方向寸法よりも大きいことを特徴とする請求項１〜３のいずれか１項記載の分割軌道輪の製造方法。   The method for manufacturing a split race ring according to any one of claims 1 to 3, wherein the jig has a substantially rectangular parallelepiped shape, and a horizontal dimension of a radial cross section of the jig is larger than a vertical dimension.
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