JP2003004051A - Trail ring of shell shape needle roller bearing and its manufacturing method - Google Patents
Trail ring of shell shape needle roller bearing and its manufacturing methodInfo
- Publication number
- JP2003004051A JP2003004051A JP2001191564A JP2001191564A JP2003004051A JP 2003004051 A JP2003004051 A JP 2003004051A JP 2001191564 A JP2001191564 A JP 2001191564A JP 2001191564 A JP2001191564 A JP 2001191564A JP 2003004051 A JP2003004051 A JP 2003004051A
- Authority
- JP
- Japan
- Prior art keywords
- cup
- ironing
- shell material
- shaped shell
- needle roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Rolling Contact Bearings (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シェル形針状ころ
軸受用軌道輪およびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing ring for needle roller bearings of shell type and a method for manufacturing the same.
【０００２】シェル形針状ころ軸受はプレス加工した外
輪を有する針状ころ軸受であって、このプレス加工した
外輪はシェルとも称され、また、その内周面がころの転
動する軌道面となることから軌道輪とも称される。A shell type needle roller bearing is a needle roller bearing having an outer ring that is pressed, and the outer ring that is pressed is also called a shell, and its inner peripheral surface forms a raceway surface on which rollers roll. It is also called a bearing ring.
【０００３】[0003]
【従来の技術】図５に示されるシェル形針状ころ軸受
は、軌道輪１と、軌道面すなわち軌道輪１の内周面２に
転動自在に組み込まれた複数の針状ころ３と、針状ころ
３を円周方向等間隔に保持する保持器４を主要な構成要
素としている。軌道輪１は鋼板製のブランクからプレス
加工により製作される。軌道輪１の両端部には、内径側
に折り曲げた内向きのフランジ１ａ、１ｂを形成してい
る。2. Description of the Related Art A shell type needle roller bearing shown in FIG. 5 has a bearing ring 1 and a plurality of needle rollers 3 rotatably incorporated in a bearing surface, that is, an inner peripheral surface 2 of the bearing ring 1. The cage 4 that holds the needle rollers 3 at equal intervals in the circumferential direction is a main component. The bearing ring 1 is manufactured by pressing a blank made of steel plate. At both ends of the bearing ring 1, inward flanges 1a and 1b bent toward the inner diameter side are formed.
【０００４】従来の軌道輪１の製造工程を図６ないし図
１０に示す。なお、図６ないし図９は各工程におけるプ
レス装置の断面図であり、図１０は各工程における素材
の断面を示す。The manufacturing process of the conventional bearing ring 1 is shown in FIGS. 6 to 9 are cross-sectional views of the pressing device in each step, and FIG. 10 shows a cross section of the material in each step.
【０００５】図６は、加工開始直前の状態におけるプレ
ス装置を示している。上パンチＰ１と上限位置にある下
パンチＰ２との間に平板状のブランクすなわちシェル素
材１０がセットされている。パンチガイドＧ１は上パン
チＰ１に対して相対移動可能に弾性保持されていて、図
示のように、カップ状シェル素材１０の外周部をダイス
Ｄ１に弾性的に押し付けている。下パンチＰ２は上パン
チＰ１に向けて弾性的に保持されており、上パンチＰ１
の下降に追随して下降し、上パンチＰ１が上昇すると弾
性力で上昇してダイスＤ１からカップ状シェル素材１０
を排出する働きをする。そして、上パンチＰ１を下降さ
せてカップ状シェル素材１０をダイスＤ１内に押し込む
ことによりカップ状シェル素材１０に深絞りを施す。こ
の深絞りは第一深絞り工程（図７（Ａ））と第二深絞り
工程の二段階に分けて行われる。その後、底押し行程
（図８（Ａ））、外径しごき行程（図８（Ｂ））、底抜
き行程（９（Ａ））、トリミング行程（図９（Ｂ））の
各工程が続く。FIG. 6 shows the pressing device in a state immediately before the start of processing. A flat plate-shaped blank, that is, a shell material 10 is set between the upper punch P1 and the lower punch P2 at the upper limit position. The punch guide G1 is elastically held so as to be movable relative to the upper punch P1, and the outer peripheral portion of the cup-shaped shell material 10 is elastically pressed against the die D1 as shown in the drawing. The lower punch P2 is elastically held toward the upper punch P1.
When the upper punch P1 rises, it rises due to the elastic force and moves from the die D1 to the cup-shaped shell material 10
Works to discharge. Then, the upper punch P1 is lowered to push the cup-shaped shell material 10 into the die D1 to perform deep drawing on the cup-shaped shell material 10. This deep drawing is performed in two stages of a first deep drawing step (FIG. 7A) and a second deep drawing step. After that, the bottom pushing step (FIG. 8A), the outer diameter ironing step (FIG. 8B), the bottom punching step (9 (A)), and the trimming step (FIG. 9B) follow.
【０００６】第一深絞り工程
図６に示した状態から図７（Ａ）に示すように上パンチ
Ｐ１が下降することにより、カップ状シェル素材１０が
絞り加工され、図１０（Ａ）に示すように比較的底の浅
いカップ状断面となる。この後、上パンチＰ１が後退す
るとともに下パンチＰ２が上昇し、カップ状シェル素材
１０の取り出しが行われる。First Deep Drawing Step As the upper punch P1 descends from the state shown in FIG. 6 as shown in FIG. 7 (A), the cup-shaped shell material 10 is drawn and shown in FIG. 10 (A). Thus, the cup-shaped cross section has a relatively shallow bottom. After that, the upper punch P1 retracts and the lower punch P2 rises, and the cup-shaped shell material 10 is taken out.
【０００７】第二深絞り工程
図７（Ｂ）に示すように、第一深絞り加工を経たカップ
状シェル素材１０をダイスＤ２内に挿入し、上パンチＰ
３で最終製品と略等しい寸法までさらに深絞り加工す
る。第一および第二深絞り工程では、図１０（Ａ）
（Ｂ）から分かるように、カップ状シェル素材１０の底
隅Ｒ１１を最終製品に比べて大きな曲率半径とすること
により、深絞り加工が精度よく行えるようにしてある。Second Deep Drawing Step As shown in FIG. 7 (B), the cup-shaped shell material 10 subjected to the first deep drawing is inserted into the die D2, and the upper punch P is formed.
In step 3, further deep drawing is performed to a size approximately equal to the final product. In the first and second deep drawing steps, FIG.
As can be seen from (B), the bottom corner R11 of the cup-shaped shell material 10 has a larger radius of curvature than that of the final product, so that deep drawing can be performed accurately.
【０００８】底押し工程
図８（Ａ）に示すように、カップ状シェル素材１０を底
押し用上パンチＰ４でダイスＤ３内に挿入し、カップ状
シェル素材１０の底隅Ｒ１１を上パンチＰ４の先端外周
で押圧して、図１０（Ｃ）に示すように小さな曲率半径
の隅Ｒ１２に加工する。この底隅Ｒ１２の曲率半径は最
終製品（図４）たる軌道輪における底隅Ｒと実質的に等
しい。Bottom Pressing Process As shown in FIG. 8A, the cup-shaped shell material 10 is inserted into the die D3 by the bottom-pressing upper punch P4, and the bottom corner R11 of the cup-shaped shell material 10 is moved to the upper punch P4. It is pressed by the outer circumference of the tip to form a corner R12 having a small radius of curvature as shown in FIG. The radius of curvature of this bottom corner R12 is substantially equal to the bottom corner R in the bearing ring which is the final product (FIG. 4).
【０００９】外径しごき工程
図８（Ｂ）に示すように、カップ状シェル素材１０をし
ごき用上パンチＰ５でダイスＤ４に挿入し、カップ状シ
ェル素材１０の外周面をダイスＤ４でしごき加工する。
しごき用上パンチＰ５の先端外周は、カップ状シェル素
材１０の底隅Ｒ１２の曲率半径と同じかそれよりも小さ
な曲率半径を有し、カップ状シェル素材１０の外周面を
しごき用ダイスＤ４の内周面に押し付けながらしごくこ
とにより、カップ状シェル素材１０の外周面を所定の外
径寸法に仕上げる。このしごき工程も、荒しごきと仕上
げしごきの二段階に分けて行うことがある。Outer Diameter Ironing Process As shown in FIG. 8 (B), the cup-shaped shell material 10 is inserted into the die D4 with the upper punch P5 for ironing, and the outer peripheral surface of the cup-shaped shell material 10 is ironed with the die D4. .
The outer periphery of the tip of the upper punch P5 for ironing has a radius of curvature equal to or smaller than the radius of curvature of the bottom corner R12 of the cup-shaped shell material 10, and the outer peripheral surface of the cup-shaped shell material 10 is set within the ironing die D4. By squeezing while pressing against the peripheral surface, the outer peripheral surface of the cup-shaped shell material 10 is finished to have a predetermined outer diameter dimension. This ironing process may also be performed in two stages, rough ironing and finishing ironing.
【００１０】同時に、上パンチＰ５の外周の段付き面
で、カップ状シェル素材１０の開口端部に段付き部１４
をしごき加工する。段付き部１４は、後工程の縁曲げを
容易にするため薄肉にする工程で、たとえば図１０
（Ｄ）に示すような二段形状にしごき加工される。段付
き部１４の外側段部１４ａが後の縁切り工程で切除さ
れ、内側段部１４ｂが後の縁曲げ行程で内側に折り曲げ
られてフランジとなる。At the same time, the stepped portion 14 is provided at the open end of the cup-shaped shell material 10 on the stepped surface on the outer periphery of the upper punch P5.
Ironing. The stepped portion 14 is formed in a step of thinning it in order to facilitate the edge bending in the subsequent step, for example, as shown in FIG.
It is ironed into a two-step shape as shown in (D). The outer stepped portion 14a of the stepped portion 14 is cut off in a later edging step, and the inner stepped portion 14b is bent inward in a later edging step to form a flange.
【００１１】底抜き工程
図9（Ａ）に示すように、有底のカップ状シェル素材１
０を底抜き用上パンチＰ６でダイスＤ５内に挿入し、中
空の底抜き用下パンチＰ７で受けながら上パンチＰ６を
下降させることにより、カップ状シェル素材１０の底中
央部を打ち抜く。また、この底抜き加工で、図１０
（Ｅ）に示すように、カップ状シェル素材１０の底にフ
ランジ１ａが形成される。Bottom-draining process As shown in FIG. 9 (A), a bottomed cup-shaped shell material 1
0 is inserted into the die D5 by the bottom punching upper punch P6, and the upper punch P6 is lowered while being received by the hollow bottom punching lower punch P7 to punch the center portion of the bottom of the cup-shaped shell material 10. In addition, in this bottom punching process, as shown in FIG.
As shown in (E), a flange 1a is formed on the bottom of the cup-shaped shell material 10.
【００１２】トリミング（縁切り）工程
図９（Ｂ）に示すように、カップ状シェル素材１０を縁
切り用上パンチＰ８でダイスＤ６内に挿入し、下パンチ
Ｐ９で受けながら上パンチＰ８を下降させることにより
カップ状シェル素材１０の開口端部の縁切りを行う。こ
の縁切りでは、図１０（Ｆ）に示すように、段付き部１
４の外側段部１４ａが切除され、寸法精度の安定した内
側段部１４ｂだけが残る。Trimming (Edge Cutting) Process As shown in FIG. 9B, the cup-shaped shell material 10 is inserted into the die D6 by the upper punch P8 for edge cutting, and the upper punch P8 is lowered while being received by the lower punch P9. The edge of the open end of the cup-shaped shell material 10 is cut by. In this edge cutting, as shown in FIG.
The outer step portion 14a of No. 4 is cut off, and only the inner step portion 14b with stable dimensional accuracy remains.
【００１３】後工程
トリミング行程の後、カップ状シェル素材１０の全体に
焼入れ処理が行われる。次に、カップ状シェル素材１０
の内側段部１４ｂのある開口端部に、この開口端部を後
の縁曲げ工程で折り曲げても割れが発生しないように焼
戻し処理をした後、タンブリング（タンブラ加工）によ
って焼入れ処理および焼きなまし処理による着色が除去
される。その後、カップ状シェル素材１０に保持器付き
針状ころ４が挿入され（図5参照）、開口端部の内側段
部１４ｂが縁曲げされて他方のフランジ１ｂが形成され
る。このようにして製作されたシェル形針状ころ軸受
は、ハウジング等に形成した保持孔に軌道輪１を締め代
をもって圧入して組み付けられる。After the post-process trimming process, the entire cup-shaped shell material 10 is quenched. Next, the cup-shaped shell material 10
After the tempering treatment is applied to the opening end portion having the inner stepped portion 14b so that the opening end portion is not cracked even when the opening end portion is bent in the subsequent edging step, the hardening treatment and the annealing treatment are performed by tumbling (tumbling). Coloring is removed. Then, the needle roller 4 with a retainer is inserted into the cup-shaped shell material 10 (see FIG. 5), and the inner stepped portion 14b at the opening end is bent to form the other flange 1b. The needle roller bearing of shell type manufactured in this manner is assembled by press-fitting the bearing ring 1 into a holding hole formed in a housing or the like with a tightening margin.
【００１４】[0014]
【発明が解決しようとする課題】従来のシェル形針状こ
ろ軸受については、軸受寿命の不足、使用中の音響不
良、ハウジング等に圧入するのに要する圧入力のばらつ
きと最大圧入力過大といった不具合が問題とされる場合
があった。これらに共通する原因の一つとして軌道輪の
精度不足が挙げられる。しかるに、上記従来のシェル形
針状ころ軸受用軌道輪の製造方法では、軌道面の表面粗
さや形状精度の向上を目的とした加工は施されていなか
った。With respect to the conventional needle roller bearings of the shell type, there are problems such as short bearing life, poor acoustics during use, variation in pressure input required for press-fitting into a housing, and excessive maximum pressure input. Was sometimes a problem. One of the causes common to these is lack of precision of the bearing ring. However, in the above-mentioned conventional method for manufacturing a shell-type needle roller bearing bearing ring, processing for improving the surface roughness and shape accuracy of the raceway surface has not been performed.
【００１５】図８の外径しごき工程は内周面に対する直
接的なしごき加工（内径しごき加工）になっていない。
むしろ、図８の外径しごき工程でカップ状シェル素材の
外周面がダイスでしごかれる際にカップ状シェル素材に
大きな歪みが与えられる。この歪みの大きさと内周面
（軌道面）の表面粗さとは比例関係にあって、カップ状
シェル素材の外周面を大きな加工力でしごき加工するほ
ど、内周面（軌道面）の表面粗さが悪化する。図１１は
加工によって素材に与えられる歪みの大きさと表面粗さ
の関係を表した概念図であるが、素材に対して加工を加
えるほど表面粗さが悪化していくことを示している。し
たがって、軌道面の表面粗さ、形状精度を改善するため
にはその部位に対して直接加工を施す必要がある。な
お、タンブラ加工では外周面は表面粗さが向上するもの
の、軌道面となる内周面は焼入れによって発生したスラ
ッジを除去する程度で、表面粗さはあまり向上しない。The outer diameter ironing process of FIG. 8 is not a direct ironing process (inner diameter ironing process) on the inner peripheral surface.
Rather, a large strain is applied to the cup-shaped shell material when the outer peripheral surface of the cup-shaped shell material is squeezed by the die in the outer diameter ironing step of FIG. There is a proportional relationship between the magnitude of this strain and the surface roughness of the inner peripheral surface (raceway surface), and the more the ironing process is performed on the outer peripheral surface of the cup-shaped shell material, the greater the surface roughness of the inner peripheral surface (raceway surface). Gets worse. FIG. 11 is a conceptual diagram showing the relationship between the magnitude of the strain applied to the material by processing and the surface roughness, but it shows that the surface roughness deteriorates as the material is processed. Therefore, in order to improve the surface roughness and shape accuracy of the raceway surface, it is necessary to directly process the portion. In the tumbling process, the surface roughness of the outer peripheral surface is improved, but the inner peripheral surface, which is the raceway surface, only removes the sludge generated by quenching, and the surface roughness is not improved so much.
【００１６】しかしながら、シェル形針状ころ軸受用軌
道輪のようなカップ状素材の内周面に内径しごき加工を
施す場合、その開口端側からしごきパンチを圧入してし
ごかざるをえず、しかも、加工に伴って塑性流動する金
属材料が素材の底隅に集中することになるため、しごき
代を大きくとることができない。また、しごきパンチの
先端外周は、カップ状シェル素材の底隅を形成する働き
をするため、小さな曲率半径とする必要がある。したが
って、加工面圧が過大となり、かじりを生じるおそれが
ある。このかじりは確実に面荒れを誘発する。However, in the case of performing inner diameter ironing on the inner peripheral surface of a cup-shaped material such as a bearing ring for a shell type needle roller bearing, the ironing punch must be press-fitted from the open end side. Moreover, since the metal material that plastically flows due to processing is concentrated on the bottom corner of the material, it is not possible to secure a large ironing allowance. Further, since the outer periphery of the tip of the ironing punch functions to form the bottom corner of the cup-shaped shell material, it is necessary to have a small radius of curvature. Therefore, the machining surface pressure becomes excessively large, which may cause galling. This galling surely induces roughening.
【００１７】先端外周を小さな曲率半径としたしごきパ
ンチでカップ状シェル素材の内周面をしごくと、潤滑油
が掻き出されて焼付きを起こしたり、しごきパンチの流
動性が悪く、円周方向の一部にかじりが生ずることがあ
る。さらに、かじり部分のみが急激に摩擦抵抗が増加し
てパンチの加工方向に抵抗が生じ、しごきパンチの円周
方向で加工力に不均一が生じる。この不均一な加工力が
最終的にしごきパンチを回転させるモーメントとして作
用し、しごきパンチの傾きを助長してカップ状素材の内
周面の表面粗さや真円度、円筒度等の精度を劣化させ
る。When the inner peripheral surface of the cup-shaped shell material is squeezed with an ironing punch having a small radius of curvature on the outer periphery of the tip, lubricating oil is scraped out to cause seizure, and the fluidity of the ironing punch is poor, and the circumferential direction May gnaw on a part of the. Further, only the galling portion sharply increases the frictional resistance to generate resistance in the working direction of the punch, resulting in uneven working force in the circumferential direction of the ironing punch. This non-uniform processing force finally acts as a moment to rotate the ironing punch, which promotes the inclination of the ironing punch and deteriorates the surface roughness, roundness and cylindricity of the inner peripheral surface of the cup-shaped material. Let
【００１８】本発明の目的は、シェル形針状ころ軸受用
軌道輪の表面粗さ、形状精度を改善することにある。An object of the present invention is to improve the surface roughness and shape accuracy of a raceway ring for a shell needle roller bearing.
【００１９】[0019]
【課題を解決するための手段】請求項１の発明は、円筒
状の軌道面の少なくとも一端側に内径側に折り曲げたフ
ランジを有するシェル形針状ころ軸受用軌道輪におい
て、前記軌道面がしごき加工面であって、その表面粗さ
（Ｒａ）が０．１５μｍ以下であることを特徴とする。
しごき加工（ironing）はパンチとダイスによってワー
クの壁面の厚さを減らし、厚さを一様にする板金プレス
加工の一分野として知られている。この発明のシェル形
針状ころ軸受用軌道輪は、軌道面がしごき加工面すなわ
ち直接しごき加工を施した面であるため、外周面にのみ
しごき加工を施した従来のシェル形針状ころ軸受用軌道
輪に比べて、軌道面の表面粗さおよび円筒度、真円度と
いった形状精度が向上している。ここに、表面粗さは、
ＪＩＳ Ｂ ０６０１に規定された中心線平均粗さ（Ｒ
ａ）によるものとする。According to a first aspect of the invention, in a bearing ring for a shell needle roller bearing having a flange bent to the inner diameter side at least on one end side of a cylindrical raceway surface, the raceway surface is ironed. The machined surface is characterized in that its surface roughness (Ra) is 0.15 μm or less.
Ironing is known as a field of sheet metal stamping that reduces the thickness of the wall surface of a work by using a punch and a die to make the thickness uniform. Since the raceway for the shell type needle roller bearing of the present invention has the raceway surface that is ironed, that is, the surface that has been directly ironed, for the conventional shell type needle roller bearing in which only the outer peripheral surface is ironed. Compared to bearing rings, the surface accuracy of the raceway surface and dimensional accuracy such as cylindricity and roundness are improved. Where the surface roughness is
Centerline average roughness (R specified in JIS B 0601
a).
【００２０】請求項２の発明は、鋼板製ブランクを深絞
り加工によりカップ状シェル素材に成形する深絞り工程
と、前記カップ状シェル素材の底隅部を面押しして所定
の曲率半径にする面押し工程と、前記カップ状シェル素
材の開口端部に段付き部をしごき加工により形成する段
付け工程と、前記開口端部の周縁部を切除する縁切り工
程とを有するシェル形針状ころ軸受用軌道輪の製造方法
において、前記縁切り加工の後に前記カップ状シェル素
材の内周面をしごき加工するしごき工程をさらに有する
ことを特徴とするシェル形針状ころ軸受用軌道輪の製造
方法である。軌道輪の製造過程において、カップ状シェ
ル素材の内周面にしごき加工を施すことにより、軌道面
の寸法精度が高く表面粗さも良好なシェル形針状ころ軸
受用軌道輪を得ることができる。According to a second aspect of the present invention, a deep drawing step of forming a blank made of a steel plate into a cup-shaped shell material by deep drawing, and a bottom corner portion of the cup-shaped shell material are pressed into a predetermined radius of curvature. Shell-shaped needle roller bearing including a face pressing step, a step of forming a stepped portion on the opening end of the cup-shaped shell material by ironing, and an edge cutting step of cutting the peripheral edge of the opening end A method for manufacturing a bearing ring for a shell type needle roller bearing, further comprising an ironing step of ironing the inner peripheral surface of the cup-shaped shell material after the edging process. . By subjecting the inner peripheral surface of the cup-shaped shell material to the ironing process in the process of manufacturing the bearing ring, it is possible to obtain the bearing ring for a shell needle roller bearing having high dimensional accuracy of the raceway surface and good surface roughness.
【００２１】請求項３の発明は、請求項２に記載のシェ
ル形針状ころ軸受用軌道輪の製造方法における前記しご
き工程において、所定の外径を有するしごきパンチを前
記カップ状シェル素材の底部に当接するまで挿入し、前
記カップ状シェル素材を最終製品たる軌道輪の外径と実
質的に等しい内径のダイスに圧入し、前記しごきパンチ
を前記カップ状シェル素材の開口側に向けて引き抜くこ
とによりしごき加工を行うことを特徴とする。カップ状
シェル素材の円筒状内周面のしごき加工を、カップ状シ
ェル素材の開口端側からではなく、逆に開口端側に向け
て行うことによって、カップ状シェル素材の内周面のし
ごき加工が実現した。その結果、シェル形針状ころ軸受
用軌道輪の軌道面の表面粗さ、形状精度の向上という所
期の目的を達成することができたものである。According to a third aspect of the present invention, in the ironing step in the method for manufacturing a shell-shaped needle roller bearing bearing ring according to the second aspect, an ironing punch having a predetermined outer diameter is provided at the bottom of the cup-shaped shell material. The cup-shaped shell material is pressed into a die having an inner diameter substantially equal to the outer diameter of the bearing ring as the final product, and the ironing punch is pulled out toward the opening side of the cup-shaped shell material. It is characterized by performing ironing processing by. Ironing of the inner peripheral surface of the cup-shaped shell material is performed by ironing the inner cylindrical surface of the cup-shaped shell material not toward the opening end side of the cup-shaped shell material but toward the opening end side. Was realized. As a result, the intended purpose of improving the surface roughness and the shape accuracy of the raceway surface of the shell type needle roller bearing raceway could be achieved.
【００２２】ここで、カップ状シェル素材には、その底
部が打ち抜き加工されたもの、打ち抜き加工されないも
ののいずれも含まれる。このカップ状素材の底部の隅の
面押し加工等の必要な各種プレス加工、しごき加工を終
了して最終段階で内周面のしごき加工を実施することに
より、しごき加工された内周面がそのまま最終製品たる
軌道輪の軌道面となるため、表面粗さ、形状精度が高精
度に維持される。Here, the cup-shaped shell material includes both those whose bottom is stamped and those which are not stamped. By performing various necessary press working such as surface pressing at the bottom corner of this cup-shaped material and ironing the inner peripheral surface at the final stage, the ironed inner peripheral surface remains as it is. Since it is the raceway surface of the bearing ring that is the final product, the surface roughness and shape accuracy are maintained with high precision.
【００２３】請求項４の発明は、鋼板製ブランクを深絞
り加工によりカップ状シェル素材に成形する深絞り工程
と、前記カップ状シェル素材の開口端部に段付き部をし
ごき加工により形成する段付け工程と、前記カップ状シ
ェル素材の底部分を打ち抜く底抜き工程と、前記カップ
状シェル素材の開口端部の周縁部を切除する縁切り工程
と、所定の外径を有するしごきパンチを前記カップ状シ
ェル素材の底部に当接するまで挿入し、前記カップ状シ
ェル素材の底隅部を面押しして所定の曲率半径にする面
押し工程と、前記カップ状シェル素材を最終製品たる軌
道輪の外径と実質的に等しい内径のダイスに圧入し、前
記しごきパンチを前記カップ状シェル素材の開口側に向
けて引き抜くことによりしごき加工を行うしごき工程と
を有することを特徴とするシェル形針状ころ軸受用軌道
輪の製造方法である。According to a fourth aspect of the present invention, a deep drawing step of forming a steel plate blank into a cup-shaped shell material by deep drawing and a step of forming a stepped portion at the open end of the cup-shaped shell material by ironing. Attaching step, bottoming step of punching out the bottom portion of the cup-shaped shell material, edging step of cutting out the peripheral edge portion of the open end of the cup-shaped shell material, and ironing punch having a predetermined outer diameter in the cup shape. Inserting until it contacts the bottom of the shell material, and pressing the bottom corner of the cup-shaped shell material to a predetermined radius of curvature, and the outer diameter of the race ring that is the final product of the cup-shaped shell material. And an ironing step of performing an ironing process by press-fitting into a die having an inner diameter substantially equal to the above and pulling out the ironing punch toward the opening side of the cup-shaped shell material. A cup needle roller producing method of the bearing races and.
【００２４】有底カップ状のシェル素材の底部を打ち抜
き加工して内向きのフランジを形成する工程の後の最終
工程に内周面のしごき加工工程を実行するものであり、
しごき加工に使用されるしごきパンチでしごき加工直前
にカップ状シェル素材のフランジのある隅Ｒを面押し加
工する。これにより、１本のしごきパンチに、カップ状
シェル素材の底の隅Ｒ部を面押しするパンチと、内周面
をしごき加工するパンチとを兼ねさせることができる。
しかも、内径しごき加工に先立ってしごきパンチをカッ
プ状シェル素材に挿入する際に、面押し工程も同時に実
行することができるため、実質上一工程省略したことと
なり、サイクルタイムが短縮される。The inner peripheral surface ironing step is executed as a final step after the step of punching the bottom of the bottomed cup-shaped shell material to form the inward flange.
The corner R having the flange of the cup-shaped shell material is pressed against the surface immediately before the ironing with the ironing punch used for the ironing. Thus, one ironing punch can be used both as a punch for pressing the bottom corner R of the cup-shaped shell material and as a punch for ironing the inner peripheral surface.
Moreover, when the ironing punch is inserted into the cup-shaped shell material prior to the inner-diameter ironing process, the surface pressing step can be simultaneously executed, so that substantially one step is omitted and the cycle time is shortened.
【００２５】請求項５の発明は、請求項３または４に記
載のシェル形針状ころ軸受用軌道輪の製造方法におい
て、前記しごきパンチが、最終製品たる軌道輪における
軌道面の内径と実質的に等しい外径の先端部と、前記先
端部から離れるほど外径が漸減するテーパ部とからなる
加工ヘッドを有することを特徴とする。According to a fifth aspect of the present invention, in the method of manufacturing a shell-type needle roller bearing raceway according to the third or fourth aspect, the ironing punch is substantially the same as the inner diameter of the raceway surface of the final raceway ring. And a taper portion whose outer diameter gradually decreases as the distance from the tip portion increases.
【００２６】しごきパンチをカップ状シェル素材の開口
から奥まで挿入して加工ヘッドの先端部をカップ状シェ
ル素材の底に当接させ、そうして両者を一体化した状態
でダイスに圧入した後、しごきパンチをカップ状シェル
素材の開口側に向けて引き抜くことによりカップ状シェ
ル素材の内周面をしごき加工する。加工ヘッドのテーパ
部は先端部から離れるほど外径が漸減しているため、し
ごき加工に際してカップ状シェル素材に過大な面圧が発
生することがなく、かじり発生を防止すると共に、潤滑
油をかみ込み易くして焼き付けを抑制する。この明細書
において、実質的に等しいとは、通常の加工公差の範囲
内のものを含む趣旨である。After the ironing punch is inserted from the opening of the cup-shaped shell material to the back to bring the tip of the processing head into contact with the bottom of the cup-shaped shell material, and after press-fitting the two into an integrated state in a die. , The inner peripheral surface of the cup-shaped shell material is ironed by pulling out the ironing punch toward the opening side of the cup-shaped shell material. Since the outer diameter of the taper part of the machining head gradually decreases as it moves away from the tip, excessive surface pressure does not occur on the cup-shaped shell material during ironing, preventing galling and biting the lubricating oil. Prevents burning by making it easier to insert. In this specification, “substantially equal” is intended to include those within the range of normal processing tolerances.
【００２７】請求項６の発明は、請求項２ないし５のい
ずれかに記載の方法によって製造されたシェル形針状こ
ろ軸受用軌道輪である。請求項２ないし５に関連して既
述したところから明らかなように、この軌道輪の軌道面
はしごき加工によって仕上げられた面である。A sixth aspect of the present invention is a bearing ring for a shell needle roller bearing manufactured by the method according to any of the second to fifth aspects. As is clear from what has been described in relation to claims 2 to 5, the raceway surface of this race is a surface finished by ironing.
【００２８】[0028]
【発明の実施の形態】以下、図１ないし図３を参照して
本発明の実施の形態を説明する。なお、添付図面の全図
を通じて実質上同一の部品または部分には同一の符号を
付して説明の重複を避けることとする。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. Throughout all the drawings of the accompanying drawings, substantially the same parts or portions are designated by the same reference numerals to avoid duplication of description.
【００２９】図1はシェル形針状ころ軸受（図５参照）
用軌道輪の製造過程におけるしごき工程を段階的に図示
したものである。カップ状シェル素材１０は既述の図１
０（Ｆ）のトリミング工程で得られたものとほぼ同様の
形状で、円筒状の内周面２の一端に内向きのフランジ１
ａを有し、他端側は開口端部１５となっている。開口端
部１５は段付き部１４を縁切り加工した円筒端部であ
る。このカップ状シェル素材１０は、図８のしごき工程
を除く既述の図７および図９の各工程を経て製作するこ
とができる。FIG. 1 shows a shell needle roller bearing (see FIG. 5).
FIG. 3 is a diagram illustrating, in stages, the ironing process in the manufacturing process of a bearing ring. The cup-shaped shell material 10 is shown in FIG.
A flange 1 having a shape similar to that obtained in the trimming step of 0 (F) and having an inward facing flange 1 at one end of a cylindrical inner peripheral surface 2.
a, and the other end is an open end 15. The open end portion 15 is a cylindrical end portion obtained by cutting the stepped portion 14 with an edge. The cup-shaped shell material 10 can be manufactured through the above-described steps of FIGS. 7 and 9 except the ironing step of FIG. 8.
【００３０】図２（Ａ）にも示すように、しごきパンチ
２０は概ね円柱状で、先端に加工ヘッド２３を有する。
加工ヘッド２３はテーパ部２１と先端部２２とからな
る。テーパ部２１は先端にゆくほど大径となった、言い
換えれば先端から離れるほど外径が漸減した円錐テーパ
面である。先端部２２の外径は最終製品たる軌道輪にお
ける軌道面の内径寸法と実質的に等しく設定してある。
先端部２２の外周面は小さな曲率半径の曲面で、この曲
率半径はカップ状シェル素材１０の底隅Ｒ１２の曲率半
径と等しいか、それよりも小さい。カップ状シェル素材
１０のしごき加工前の内周面２の内径は、しごきパンチ
２０の先端部２２の外径より僅かに小さく設定される。As shown in FIG. 2A, the ironing punch 20 has a substantially cylindrical shape and has a processing head 23 at its tip.
The processing head 23 includes a taper portion 21 and a tip portion 22. The taper portion 21 is a conical taper surface whose diameter becomes larger toward the tip, in other words, the outer diameter is gradually reduced as the distance from the tip is increased. The outer diameter of the tip portion 22 is set to be substantially equal to the inner diameter dimension of the raceway surface of the final product raceway ring.
The outer peripheral surface of the tip portion 22 is a curved surface having a small radius of curvature, and this radius of curvature is equal to or smaller than the radius of curvature of the bottom corner R12 of the cup-shaped shell material 10. The inner diameter of the inner peripheral surface 2 of the cup-shaped shell material 10 before ironing is set to be slightly smaller than the outer diameter of the tip portion 22 of the ironing punch 20.
【００３１】しごきパンチ２０を使ってカップ状シェル
素材１０の内周面２をしごくのに先立って、図２（Ｂ）
に示すように、カップ状シェル素材１０にしごきパンチ
２０を挿入してしごきパンチ２０の先端をカップ状シェ
ル素材１０の底のフランジ１ａに当接させる。この段階
ではしごきパンチ２０とカップ状シェル素材１０の内周
面との間にはすきまがあり、両者の関係はルーズであ
る。Prior to squeezing the inner peripheral surface 2 of the cup-shaped shell material 10 using the ironing punch 20, FIG. 2 (B)
As shown in FIG. 3, the ironing punch 20 is inserted into the cup-shaped shell material 10 and the tip of the ironing punch 20 is brought into contact with the flange 1 a at the bottom of the cup-shaped shell material 10. At this stage, there is a gap between the ironing punch 20 and the inner peripheral surface of the cup-shaped shell material 10, and the relationship between the two is loose.
【００３２】このようにして一体化させた状態のカップ
状シェル素材１０／しごきパンチ２０を、図１（Ａ）に
示すように、ダイス３０の円筒形ダイス穴３１に圧入す
る。ダイス穴３１の内径は最終製品たる軌道輪における
所定の外径と実質的に等しく設定する。そして、このダ
イス穴３１の内径よりカップ状シェル素材１０の外径を
僅かに大きく設定する。したがって、ダイス穴３１にカ
ップ状シェル素材１０を圧入すると、カップ状シェル素
材１０の外周面が拘束されて外径が縮径し、それに伴い
内径も縮径して所定のしごき代が形成される。The cup-shaped shell material 10 / ironing punch 20 thus integrated is press-fitted into the cylindrical die hole 31 of the die 30 as shown in FIG. 1 (A). The inner diameter of the die hole 31 is set to be substantially equal to the predetermined outer diameter of the bearing ring which is the final product. Then, the outer diameter of the cup-shaped shell material 10 is set to be slightly larger than the inner diameter of the die hole 31. Therefore, when the cup-shaped shell material 10 is press-fitted into the die hole 31, the outer peripheral surface of the cup-shaped shell material 10 is constrained to reduce the outer diameter, and accordingly the inner diameter is also reduced to form a predetermined ironing allowance. .
【００３３】次に、図２（Ｂ）に示すように、ダイス３
０上に平板状のストッパ４０をセットして、ストッパ４
０の下面にカップ状シェル素材１０の上端を当接させ
る。ストッパ４０は、しごき荷重によってカップ状シェ
ル素材１０がダイス穴３１から抜け出すのを防止する。Next, as shown in FIG. 2B, the dice 3
Set a flat stopper 40 on top of the
The upper end of the cup-shaped shell material 10 is brought into contact with the lower surface of 0. The stopper 40 prevents the cup-shaped shell material 10 from coming out of the die hole 31 due to the ironing load.
【００３４】続いて、図２（Ｃ）に示すように、しごき
パンチ２０を上昇させてカップ状シェル素材２０から引
き抜くことによりしごき加工を行う。このとき、しごき
パンチ２０の加工ヘッド２３がカップ状シェル素材１０
のフランジ１ａ側から開口端部１５側に向けて移動し、
内周面２をしごき加工する。内周面２のしごき加工を終
えると、図２（Ｄ）に示すように、しごきパンチ２０は
ストッパ４０の上方に抜き出される。Then, as shown in FIG. 2 (C), the ironing punch 20 is lifted up and pulled out from the cup-shaped shell material 20 to perform ironing. At this time, the processing head 23 of the ironing punch 20 moves the cup-shaped shell material 10
Moving from the flange 1a side toward the opening end 15 side,
The inner peripheral surface 2 is ironed. When the ironing of the inner peripheral surface 2 is completed, the ironing punch 20 is extracted above the stopper 40, as shown in FIG.
【００３５】しごきパンチ２０の加工ヘッド２３は円錐
テーパ形状であって、最も大径の先端部２２がカップ状
シェル素材１０の内周面２をフランジ１ａの内端から開
口端部１５に向けて順にしごき加工する。この場合、加
工ヘッド２３のテーパ部２１のテーパ角度を小さくする
ことにより、しごき加工時の面圧が過大となることを回
避することができる。The processing head 23 of the ironing punch 20 has a conical taper shape, and the tip 22 having the largest diameter directs the inner peripheral surface 2 of the cup-shaped shell material 10 from the inner end of the flange 1a toward the open end 15. Ironing in order. In this case, by reducing the taper angle of the taper portion 21 of the processing head 23, it is possible to prevent the surface pressure during the ironing process from becoming excessive.
【００３６】しごきパンチ２０の加工ヘッド２３が円錐
状であるため、しごき加工時に加工部の円周方向におけ
る加工面圧分布に不均一が生じたとしても、カップ状シ
ェル素材１０に対するしごきパンチ２０の傾きが変わり
にくく、かじりが発生しない。したがって、カップ状シ
ェル素材の内周面（軌道面）２の面荒れを誘発しない。Since the machining head 23 of the ironing punch 20 has a conical shape, even if the machining surface pressure distribution in the circumferential direction of the machined portion is uneven during the ironing, the ironing punch 20 with respect to the cup-shaped shell material 10 The inclination does not change easily and no galling occurs. Therefore, the surface roughness of the inner peripheral surface (raceway surface) 2 of the cup-shaped shell material is not induced.
【００３７】加工ヘッド２３のテーパ部２１がしごき加
工方向に緩やかに縮径しているため、くさび効果により
加工部に潤滑油をかみ込みやすく、焼付きが防止され
る。Since the taper portion 21 of the processing head 23 is gradually reduced in diameter in the ironing processing direction, the wedge effect makes it easy to bite the lubricating oil into the processing portion and prevent seizure.
【００３８】しごき加工に伴って塑性流動する金属材料
は開口端部１５に向かって流れるため、余分な金属材料
の逃げ場があり、製品ばらつきによる工具類の底づき等
のトラブルが発生する心配がない。Since the metal material that plastically flows due to the ironing process flows toward the open end portion 15, there is an escape area for the extra metal material, and there is no fear of troubles such as bottoming of tools due to product variations. .
【００３９】以上の各利点の相乗効果でもってしごきパ
ンチ２０によるカップ状シェル素材１０の安定した内径
しごき加工が実現し、しごき加工された内周面（軌道
面）２の表面粗さや真円度、円筒度等の精度が改善され
る。With the synergistic effect of each of the above advantages, stable inner diameter ironing of the cup-shaped shell material 10 by the ironing punch 20 is realized, and the surface roughness and roundness of the ironed inner peripheral surface (raceway surface) 2 are achieved. , Accuracy of cylindricity is improved.
【００４０】この実施の形態では、カップ状シェル素材
の内径しごき加工はカップ状シェル素材製作の最終工程
で実行され、精度よく仕上げられた内周面がそのまま最
終製品たる軌道輪の軌道面として提供される。カップ状
シェル素材は有底のカップ状シェル素材であってもよ
く、その場合のカップ状シェル素材の内周面のしごきパ
ンチによるしごき加工は図１に関連して既述したのと同
様に行うことができる。In this embodiment, the inner diameter ironing process of the cup-shaped shell material is performed in the final step of manufacturing the cup-shaped shell material, and the inner peripheral surface finished with high precision is provided as it is as the raceway surface of the bearing ring which is the final product. To be done. The cup-shaped shell material may be a cup-shaped shell material having a bottom. In that case, the ironing process by the ironing punch of the inner peripheral surface of the cup-shaped shell material is performed in the same manner as described above with reference to FIG. be able to.
【００４１】また、カップ状シェル素材の円筒状内周面
の一端のフランジの底隅を小さな曲率半径に面押し加工
する工程の直後に内径しごき加工工程を実行するように
してもよい。たとえば、次に述べるように図３に示す工
程による軌道輪製造も有効である。The inner diameter ironing step may be performed immediately after the step of pressing the bottom corner of the flange at one end of the cylindrical inner peripheral surface of the cup-shaped shell material into a small radius of curvature. For example, as described below, manufacturing of bearing rings by the process shown in FIG. 3 is also effective.
【００４２】図３（Ａ）に示すカップ状シェル素材１０
は深絞り工程で得られた有底カップ状のもので、底の隅
部は曲率半径の大きな隅Ｒ部１１である。このカップ状
シェル素材１０を図３（Ｂ）に示すように底抜き加工
し、段付け加工とトリミング加工して隅Ｒ部１１に鍔部
１ａを形成し、開口端部１５に段付き部１４を形成す
る。この後、図３（Ｃ）に示すようにパンチ２０を底ま
で挿入したカップ状シェル素材１０をダイス３０のダイ
ス穴３１に圧入する。図３（Ｃ）のダイス穴３１は底付
き穴で、このダイス穴３１の底部３２にカップ状シェル
素材１０のフランジ１ａを当接させて、パンチ２０の先
端外周２２で隅Ｒ１１を面押しして、隅Ｒ１１を小さな
所定の曲率半径の隅Ｒ１２に加工する。面押しが終了し
たパンチ２０を上昇させると、図１と同じ要領でカップ
状シェル素材１０の内周面がパンチ２０の加工部２３で
しごき加工される。The cup-shaped shell material 10 shown in FIG.
Is a bottomed cup shape obtained in the deep drawing step, and the corner portion of the bottom is a corner R portion 11 having a large radius of curvature. As shown in FIG. 3 (B), the cup-shaped shell material 10 is punched out, stepped and trimmed to form a collar 1a at the corner R portion 11, and a stepped portion 14 at the opening end 15. To form. Thereafter, as shown in FIG. 3C, the cup-shaped shell material 10 having the punch 20 inserted to the bottom is press-fitted into the die hole 31 of the die 30. The die hole 31 of FIG. 3C is a hole with a bottom, and the flange 1a of the cup-shaped shell material 10 is brought into contact with the bottom portion 32 of this die hole 31, and the corner R11 is pressed by the outer periphery 22 of the tip of the punch 20. Then, the corner R11 is processed into a corner R12 having a small predetermined radius of curvature. When the punch 20 that has finished pressing is raised, the inner peripheral surface of the cup-shaped shell material 10 is ironed by the processing portion 23 of the punch 20 in the same manner as in FIG.
【００４３】図３の製造方法のように共通のパンチ２０
でカップ状シェル素材１０の面押し加工と内径しごき加
工を行うことで、軌道輪製造用パンチの数が少なくで
き、パンチを使用した加工工程数も少なくできる。A common punch 20 as in the manufacturing method of FIG.
By subjecting the cup-shaped shell material 10 to face pressing and inner diameter ironing, the number of punches for manufacturing the bearing ring can be reduced and the number of processing steps using the punches can be reduced.
【００４４】[0044]
【発明の効果】本発明の効果を検証するため、鋼板製カ
ップ状シェル素材の円筒状内周面の、しごき加工前後の
表面粗さ、円筒度、真円度を測定したところ、次の実験
データを得た。In order to verify the effect of the present invention, the surface roughness, cylindricity, and roundness of the cylindrical inner peripheral surface of the steel plate cup-shaped shell material before and after ironing were measured. I got the data.
【００４５】実験１（表面粗さＲａ）
カップ状シェル素材の内周面の円周方向三等分位置につ
いて、しごき加工前としごき加工後の表面粗さＲａ（μ
ｍ）を測定した結果は次のとおりであった。Experiment 1 (Surface Roughness Ra) Surface roughness Ra (μ before and after ironing) was determined for the circumferential trisecting position of the inner peripheral surface of the cup-shaped shell material.
The result of having measured m) was as follows.
【００４６】
しごき加工前 （０．３３６６）、（０．３６７１）、（０．３８５１）
しごき加工後 （０．０３１９）、（０．０３２８）、（０．０４０９）
しごき加工前の表面粗さは従来の製品軌道面の表面粗さ
に相当することから、上記実験結果より、本発明品の表
面粗さは従来品の約１／１０に改善されることが分か
る。Before ironing (0.3366), (0.3671), (0.3851) After ironing (0.0319), (0.0328), (0.0409) Surface roughness before ironing Corresponds to the surface roughness of the conventional product raceway surface, it can be seen from the above experimental results that the surface roughness of the product of the present invention is improved to about 1/10 of that of the conventional product.
【００４７】また、カップ状シェル素材の内周面の、し
ごき加工前の表面粗さがＲａ＝０．３３６６、しごき加
工後の表面粗さがＲａ＝０．０３１９である１箇所の粗
さ曲線を図４に示す。図４（Ａ）がしごき加工前、図４
（Ｂ）がしごき加工後であり、両者の対比から表面粗さ
が改善されたことが明瞭に見て取れる。かかる軌道面の
表面粗さＲａは、実用上０．１５以下が望ましいとされ
るところ、カップ型シェル素材の内周面をしごき加工す
ることによって平均して表面粗さＲａ≦０．１が達成で
きる。Further, the roughness curve of the inner peripheral surface of the cup-shaped shell material before the ironing process is Ra = 0.3366, and the surface roughness after the ironing process is Ra = 0.0319. Is shown in FIG. Figure 4 (A) is before ironing, Figure 4
(B) is after ironing, and it can be clearly seen from the comparison between the two that the surface roughness is improved. The surface roughness Ra of the raceway surface is practically desired to be 0.15 or less, and the surface roughness Ra ≦ 0.1 is achieved on average by ironing the inner peripheral surface of the cup-shaped shell material. it can.
【００４８】実験２（円筒度ＣＹ）
カップ状シェル素材の円筒度ＣＹ（μｍ）を測定した結
果は次のとおりである。ここに、円筒度は、円筒状の面
に内接する円筒と、その面上の各点との間の各ラジアル
平面内での最大のラジアル距離と定義される。Experiment 2 (cylindricity CY) The results of measuring the cylindricity CY (μm) of the cup-shaped shell material are as follows. Here, the cylindricity is defined as the maximum radial distance in each radial plane between a cylinder inscribed in a cylindrical surface and each point on the surface.
【００４９】しごき加工前 １８．２
しごき加工後 １５．０
この実験結果より、円筒度も十分に改善されることが確
認された。Before ironing 18.2 After ironing 15.0 From these experimental results, it was confirmed that the cylindricity was also sufficiently improved.
【００５０】実験３（真円度）
カップ状シェル素材の内周面の三等分位置における真円
度を測定した結果は次のとおりである。ここに、真円度
は、円形の線に内接する円と、その円形の線上の各点と
の間の最大のラジアル距離と定義される。Experiment 3 (Roundness) The roundness of the inner peripheral surface of the cup-shaped shell material at three equally divided positions was measured as follows. Here, the circularity is defined as the maximum radial distance between a circle inscribed in a circular line and each point on the circular line.
【００５１】
しごき加工前 （１０．８μｍ）、（８．４μｍ）、（７．２μｍ）
しごき加工後 （４．４μｍ）、（４．２μｍ）、（４．５μｍ）
しごき加工前の真円度は従来の製品軌道面の真円度に相
当することから、この実験結果より、真円度が約２倍に
改善されたことが分かる。Before ironing (10.8 μm), (8.4 μm), (7.2 μm) After ironing (4.4 μm), (4.2 μm), (4.5 μm) Roundness before ironing Corresponds to the roundness of the conventional product orbital surface, it can be seen from this experimental result that the roundness is improved to about twice.
【００５２】上記のとおり、本発明によりシェル形針状
ころ軸受用軌道輪の表面粗さ、形状精度を改善すること
ができる。As described above, according to the present invention, it is possible to improve the surface roughness and the shape accuracy of the bearing ring for the needle roller bearing of shell type.
【図１】本発明の製造方法を説明するための断面図であ
って、（Ａ）はカップ状シェル素材挿入時、（Ｂ）はス
トッパー設置時、（Ｃ）はしごき加工時、（Ｄ）はしご
き加工後を示す。FIG. 1 is a cross-sectional view for explaining the manufacturing method of the present invention, (A) when inserting a cup-shaped shell material, (B) when a stopper is installed, (C) when ironing, (D). Shown after ironing.
【図２】（Ａ）はしごきパンチとカップ状シェル素材の
断面図、（Ｂ）はしごきパンチとカップ状シェル素材に
挿入した状態の断面図である。FIG. 2A is a sectional view of an ironing punch and a cup-shaped shell material, and FIG. 2B is a sectional view of the ironing punch and a cup-shaped shell material inserted into the ironing punch and the cup-shaped shell material.
【図３】本発明の別の実施の形態を説明するための断面
図であって、（Ａ）は深絞り加工時のカップ状シェル素
材断面図、（Ｂ）は底抜き工程およびトリミング工程後
のカップ状シェル素材断面図、（Ｃ）はしごき加工直前
の底押し工程の断面図である。3A and 3B are cross-sectional views for explaining another embodiment of the present invention, in which FIG. 3A is a cross-sectional view of a cup-shaped shell material at the time of deep drawing, and FIG. FIG. 4C is a cross-sectional view of the cup-shaped shell material of (C), and is a cross-sectional view of the bottom pressing step immediately before ironing.
【図４】（Ａ）はカップ形シェル素材の内周面のしごき
加工前の粗さ曲線図、（Ｂ）はカップ形シェル素材の内
周面のしごき加工後の粗さ曲線図である。FIG. 4A is a roughness curve diagram of the inner peripheral surface of the cup-shaped shell material before ironing, and FIG. 4B is a roughness curve diagram of the inner peripheral surface of the cup-shaped shell material after ironing.
【図５】シェル形針状ころ軸受の部分断面図である。FIG. 5 is a partial sectional view of a shell needle roller bearing.
【図６】ブランクをセットした状態のプレス装置の断面
図である。FIG. 6 is a cross-sectional view of the press device with a blank set.
【図７】（Ａ）は図６に示されるプレス装置の第一深絞
り工程における拡大断面図、（Ｂ）は図６に示されるプ
レス装置の第二深絞り工程における拡大断面図である。7A is an enlarged cross-sectional view in the first deep drawing step of the pressing apparatus shown in FIG. 6, and FIG. 7B is an enlarged cross-sectional view in the second deep drawing step of the pressing apparatus shown in FIG.
【図８】（Ａ）は図６に示されるプレス装置の底押し工
程における拡大断面図、（Ｂ）は図６に示されるプレス
装置の外径しごき工程における拡大断面図である。8A is an enlarged cross-sectional view in a bottom pressing step of the press device shown in FIG. 6, and FIG. 8B is an enlarged cross-sectional view in an outer diameter ironing process of the press device shown in FIG.
【図９】（Ａ）は図６に示されるプレス装置の底抜き工
程における拡大断面図、（Ｂ）は図６に示されるプレス
装置のトリミング工程における拡大断面図である。9A is an enlarged cross-sectional view in a bottoming step of the press device shown in FIG. 6, and FIG. 9B is an enlarged cross-sectional view in a trimming process of the press device shown in FIG.
【図１０】（Ａ）は図７（Ａ）に示される工程における
カップ状シェル素材の拡大断面図、（Ｂ）は図7（Ｂ）
に示される工程におけるカップ状シェル素材の拡大断面
図、（Ｃ）は図８（Ａ）に示される工程におけるカップ
状シェル素材の拡大断面図、（Ｄ）は図８（Ｂ）に示さ
れる工程におけるカップ状シェル素材の拡大断面図、
（Ｅ）は図９（Ａ）に示される工程におけるカップ状シ
ェル素材の拡大断面図、（Ｆ）は図９（Ｂ）に示される
工程におけるカップ状シェル素材の拡大断面図である。10 (A) is an enlarged cross-sectional view of the cup-shaped shell material in the step shown in FIG. 7 (A), and FIG. 10 (B) is shown in FIG. 7 (B).
8C is an enlarged sectional view of the cup-shaped shell material in the step shown in FIG. 8, FIG. 8C is an enlarged sectional view of the cup-shaped shell material in the step shown in FIG. 8A, and FIG. 8D is a step shown in FIG. 8B. An enlarged cross-sectional view of the cup-shaped shell material in
9E is an enlarged sectional view of the cup-shaped shell material in the step shown in FIG. 9A, and FIG. 9F is an enlarged sectional view of the cup-shaped shell material in the step shown in FIG. 9B.
【図１１】加工による歪みと表面粗さの関係を示す概念
図である。FIG. 11 is a conceptual diagram showing a relationship between distortion due to processing and surface roughness.
１ 軌道輪 １ａ、 １ｂ フランジ ２ 軌道面（カップ状シェル素材の内周面） ３ 針状ころ ４ 保持器 １０ カップ状シェル素材 １１ 底隅Ｒ １２ 底隅Ｒ １４ 段付き部 １５ 開口端部 ２０ パンチ ２１ テーパ部 ２２ 先端部 ２３ 加工ヘッド ３０ ダイス ３１ ダイス穴 ４０ ストッパ 1 bearing ring 1a, 1b flange 2 Raceway surface (inner peripheral surface of cup-shaped shell material) 3 needle rollers 4 cage 10 cup-shaped shell material 11 Bottom corner R 12 Bottom corner R 14 Stepped part 15 Open end 20 punches 21 Tapered part 22 Tip 23 Processing head 30 dice 31 die hole 40 stopper
Claims (6)
径側に折り曲げたフランジを有するシェル形針状ころ軸
受用軌道輪において、 前記軌道面がしごき加工面であって、その表面粗さＲａ
が０．１５μｍ以下であることを特徴とするシェル形針
状ころ軸受用軌道輪。1. A shell type needle roller bearing bearing ring having a flange bent to the inner diameter side on at least one end side of a cylindrical raceway surface, wherein the raceway surface is an ironing surface and its surface roughness Ra.
Is 0.15 μm or less, a shell type needle roller bearing raceway.
プ状シェル素材に成形する深絞り工程と、 前記カップ状シェル素材の底隅部を面押しして所定の曲
率半径にする面押し工程と、 前記カップ状シェル素材の開口端部に段付き部をしごき
加工により形成する段付け工程と、 前記開口端部の周縁部を切除する縁切り工程とを有する
シェル形針状ころ軸受用軌道輪の製造方法において、 前記縁切り工程の後に前記カップ状シェル素材の内周面
をしごき加工する内径しごき工程をさらに有することを
特徴とするシェル形針状ころ軸受用軌道輪の製造方法。2. A deep drawing step of forming a steel plate blank into a cup-shaped shell material by deep drawing, and a surface pressing step of pressing a bottom corner portion of the cup-shaped shell material to a predetermined curvature radius. Manufacture of raceways for shell-shaped needle roller bearings, including a step of forming a stepped portion at the opening end of the cup-shaped shell material by ironing, and an edge cutting step of cutting the peripheral edge of the opening end. The method for producing a raceway for shell-shaped needle roller bearings, further comprising an inner diameter ironing step of ironing the inner peripheral surface of the cup-shaped shell material after the edging step.
径を有するしごきパンチを前記カップ状シェル素材の底
部に当接するまで挿入し、前記カップ状シェル素材を最
終製品たる軌道輪の外径と実質的に等しい内径のダイス
に圧入し、前記しごきパンチを前記カップ状シェル素材
の開口側に向けて引き抜くことによりしごき加工を行う
ことを特徴とする請求項２に記載のシェル形針状ころ軸
受用軌道輪の製造方法。3. In the inner diameter ironing step, an ironing punch having a predetermined outer diameter is inserted until it comes into contact with the bottom portion of the cup-shaped shell material, and the cup-shaped shell material is substantially the same as the outer diameter of the bearing ring which is the final product. 3. The shell type needle roller bearing according to claim 2, wherein ironing is performed by press-fitting into a die having a substantially equal inner diameter and pulling out the ironing punch toward the opening side of the cup-shaped shell material. Method of manufacturing bearing rings.
プ状シェル素材に成形する深絞り工程と、 前記カップ状シェル素材の開口端部に段付き部をしごき
加工により形成する段付け工程と、 前記カップ状シェル素材の底部分を打ち抜く底抜き工程
と、 前記カップ状シェル素材の開口端部の周縁部を切除する
縁切り工程と、 所定の外径を有するしごきパンチを前記カップ状シェル
素材の底部に当接するまで挿入し、前記カップ状シェル
素材の底隅部を面押しして所定の曲率半径にする面押し
工程と、 前記カップ状シェル素材を最終製品たる軌道輪の外径と
実質的に等しい内径のダイスに圧入し、前記しごきパン
チを前記カップ状シェル素材の開口側に向けて引き抜く
ことによりしごき加工を行う内径しごき工程とを有する
ことを特徴とするシェル形針状ころ軸受用軌道輪の製造
方法。4. A deep drawing step of forming a steel plate blank into a cup-shaped shell material by deep drawing, and a step of forming a stepped portion at the opening end of the cup-shaped shell material by ironing, A bottom punching step of punching out the bottom part of the cup-shaped shell material, an edge cutting step of cutting the peripheral portion of the opening end of the cup-shaped shell material, and an ironing punch having a predetermined outer diameter on the bottom of the cup-shaped shell material. Inserting until contacting, pressing the bottom corner of the cup-shaped shell material to a predetermined radius of curvature, and the surface-pressing step of making the cup-shaped shell material substantially equal to the outer diameter of the bearing ring that is the final product. An inner diameter ironing step of performing ironing by press-fitting into a die having an inner diameter and pulling out the ironing punch toward the opening side of the cup-shaped shell material. Manufacturing method for raceway Le cup needle roller bearings.
輪における軌道面の内径と実質的に等しい外径の先端部
と、前記先端部から離れるほど外径が漸減するテーパ部
とからなる加工ヘッドを有することを特徴とする請求項
３または４に記載のシェル形針状ころ軸受用軌道輪の製
造方法。5. A machining head in which the ironing punch includes a tip portion having an outer diameter substantially equal to an inner diameter of a raceway surface of a bearing ring as a final product, and a taper portion having an outer diameter gradually decreasing as the distance from the tip portion increases. The method for manufacturing a raceway for shell-type needle roller bearings according to claim 3 or 4, further comprising:
法によって製造されたシェル形針状ころ軸受用軌道輪。6. A bearing ring for a shell needle roller bearing manufactured by the method according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001191564A JP4080182B2 (en) | 2001-06-25 | 2001-06-25 | SHELL TYPE NEEDLE ROLLER BEARING AND MANUFACTURING METHOD THEREOF |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001191564A JP4080182B2 (en) | 2001-06-25 | 2001-06-25 | SHELL TYPE NEEDLE ROLLER BEARING AND MANUFACTURING METHOD THEREOF |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003004051A true JP2003004051A (en) | 2003-01-08 |
| JP4080182B2 JP4080182B2 (en) | 2008-04-23 |
Family
ID=19030168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001191564A Expired - Lifetime JP4080182B2 (en) | 2001-06-25 | 2001-06-25 | SHELL TYPE NEEDLE ROLLER BEARING AND MANUFACTURING METHOD THEREOF |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4080182B2 (en) |
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