JP2008279481A - Method for manufacturing inner race and outer race of rolling bearing - Google Patents

Method for manufacturing inner race and outer race of rolling bearing Download PDF

Info

Publication number
JP2008279481A
JP2008279481A JP2007125757A JP2007125757A JP2008279481A JP 2008279481 A JP2008279481 A JP 2008279481A JP 2007125757 A JP2007125757 A JP 2007125757A JP 2007125757 A JP2007125757 A JP 2007125757A JP 2008279481 A JP2008279481 A JP 2008279481A
Authority
JP
Japan
Prior art keywords
ring portion
outer ring
inner ring
die
rolling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2007125757A
Other languages
Japanese (ja)
Inventor
Kazuto Kobayashi
一登 小林
Hiroshi Koyama
寛 小山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP2007125757A priority Critical patent/JP2008279481A/en
Publication of JP2008279481A publication Critical patent/JP2008279481A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Rolling Contact Bearings (AREA)
  • Forging (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method which can stably form the inner race and the outer race of a rolling bearing. <P>SOLUTION: A partially fabricated item 3 includes a large diameter outer race portion 4 and a small diameter inner race portion 5. The outer circumference of one end portion of the inner race portion 5 is connected to the inner circumference of one end portion of the outer race portion 4. A bottom 6 is provided on the inner circumference of the other end portion of the inner race portion 5. The partially fabricated item 3 is separated into the outer race portion 4 and the inner race portion 5 by cutting off the connecting portion between the outer race portion 4 and the inner race portion 5, and the bottom 6 of the inner race portion 5 is punched out. Then, the separated outer race portion 4 and the separated inner race portion 5 are formed into required shapes by rolling respectively. In the outer race portion 4 to be processed by the rolling process, one first end portion 4a connected to the inner race portion 5 is formed into a tapered shape such that the inner circumferential edge of the end face approaches toward the other second end portion 4b. Further, in the inner race portion 5 to be processed by the rolling process, one first end portion 5a connected to the bottom 6 is formed into a tapered shape such that the inner circumferential edge of the end face approaches toward the other second end portion 5b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、転がり軸受の内外輪の製造方法に関する。   The present invention relates to a method for manufacturing inner and outer rings of a rolling bearing.

従来、１つの円柱状の材料から転がり軸受の内輪および外輪の２つの軌道輪を製造する方法が知られており、図１０および図１１に一例を示す（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, a method for manufacturing two bearing rings, that is, an inner ring and an outer ring of a rolling bearing, from one cylindrical material is known, and an example is shown in FIGS. 10 and 11 (see, for example, Patent Document 1).

第１工程：熱間加工での据え込みにより、図１０（Ａ）に示す円柱状の材料２０１から図１０（Ｂ）に示す外周面の母線形状が円弧をなす円盤状の中間成形品２０２を形成する。
第２工程：型鍛造により、中間成形品２０２から図１０（Ｃ）に示す段付きの円筒状の成形品２０３を形成する。この成形品２０３は、大径の外輪部２０４の一方の端部内周において小径の内輪部２０５の一方の端部外周が連結しており、また、内輪部２０５の他方の端部内周には底２０６が形成されている。
第３工程：成形品２０３を外輪部２０４と内輪部２０５との連結部位で切断し、図１０（Ｄ）に示すように、成形品２０３を外輪部２０４および内輪部２０５に分離する。
第４工程：図１０（Ｅ）に示すように、分離された内輪部２０５から底２０６を打ち抜く。
第５工程：外輪部２０４および内輪部２０５をローリング成形により所定の形状に成形する。 First step: A disk-shaped intermediate molded product 202 in which the generatrix of the outer peripheral surface shown in FIG. 10 (B) forms an arc from the cylindrical material 201 shown in FIG. 10 (A) by upsetting by hot working. Form.
Second step: A stepped cylindrical molded product 203 shown in FIG. 10C is formed from the intermediate molded product 202 by die forging. In this molded product 203, the outer periphery of one end of a small-diameter inner ring portion 205 is connected to the inner periphery of one end of a large-diameter outer ring portion 204, and the bottom of the inner end of the other end of the inner ring portion 205 is connected to the bottom. 206 is formed.
3rd process: The molded product 203 is cut | disconnected in the connection part of the outer ring part 204 and the inner ring part 205, and as shown in FIG.10 (D), the molded article 203 is isolate | separated into the outer ring part 204 and the inner ring part 205. FIG.
Fourth step: As shown in FIG. 10E, the bottom 206 is punched from the separated inner ring portion 205.
Fifth step: The outer ring portion 204 and the inner ring portion 205 are formed into a predetermined shape by rolling.

上記第５工程では、図１１に示すように、成形ロール２１１とマンドレル２１２とで外輪部２０４（または内輪部２０５）を局部的に径方向に挟み、成形ロール２１１を回転させて成形ロール２１１とともに外輪部２０４を回転させる。回転する外輪部２０４にマンドレル２１２を押し付けることにより、外輪部２０４を拡径させ、またマンドレル２１２に形成された環状突起２１３により外輪部２０４に軌道溝２０７を転造している。   In the fifth step, as shown in FIG. 11, the outer ring portion 204 (or inner ring portion 205) is locally sandwiched between the forming roll 211 and the mandrel 212 in the radial direction, and the forming roll 211 is rotated together with the forming roll 211. The outer ring portion 204 is rotated. By pressing the mandrel 212 against the rotating outer ring portion 204, the diameter of the outer ring portion 204 is increased, and the raceway groove 207 is rolled into the outer ring portion 204 by the annular protrusion 213 formed on the mandrel 212.

ここで、ローリング成形に供される外輪部２０４の一方の端部内周には、径方向内側に向けて凸となる段部２０８がある。この段部２０８は、上記第３工程において内輪部２０５との連結部位を切断する際に必然的に形成される。同様に、ローリング成形に供される内輪部２０５の一方の端部内周には、上記第４工程において底２０６を打ち抜く際に形成された段部がある。   Here, an inner periphery of one end of the outer ring portion 204 used for rolling molding has a stepped portion 208 that protrudes radially inward. The step portion 208 is inevitably formed when the connecting portion with the inner ring portion 205 is cut in the third step. Similarly, there is a step portion formed when the bottom 206 is punched out in the fourth step on the inner periphery of one end of the inner ring portion 205 used for rolling molding.

外輪部２０４の外周面の母線が軸に平行な直線であると、その内周に段部２０８があることにより外輪部２０４の両端部における肉厚に差が生じ、良好なローリング成形に支障をきたす虞がある。そこで、上記第２工程において外輪部２０４の外周に径方向内側に向けて凹となる段部２０９を予め形成し、肉厚の均一化が図られている。内輪部２０５についても同様である。
特開平１１−２４４９８３号公報 If the generatrix of the outer peripheral surface of the outer ring portion 204 is a straight line parallel to the axis, there will be a difference in the wall thickness at both ends of the outer ring portion 204 due to the presence of the step portion 208 on the inner periphery, which hinders good rolling molding. There is a risk of coming. Therefore, in the second step, a stepped portion 209 that is concave toward the radially inner side is formed in advance on the outer periphery of the outer ring portion 204 to achieve uniform thickness. The same applies to the inner ring portion 205.
Japanese Patent Laid-Open No. 11-244983

しかしながら、例えば外輪部２０４について、その外周に段部２０９が形成された外輪部２０４をローリング成形の際に、図１２に示すように、段部２０９があることによって外輪部２０４が必然的に傾いてしまい、安定した成形が行えない。そして、外輪部２０４が傾くことにより、段部２０９が形成されている一方の端部の内周縁が軸方向外側に変位し、図１３に示すように、マンドレル２１２への乗り上げ、あるいは、マンドレル２１２の側面との摺動による割れ、といった問題が発生する。   However, for example, when the outer ring portion 204 having the step portion 209 formed on the outer periphery of the outer ring portion 204 is formed by rolling, the outer ring portion 204 inevitably tilts due to the step portion 209 as shown in FIG. Therefore, stable molding cannot be performed. Then, when the outer ring portion 204 is inclined, the inner peripheral edge of one end portion where the step portion 209 is formed is displaced outward in the axial direction, and as shown in FIG. 13, rides on the mandrel 212 or mandrel 212. There arises a problem such as cracking due to sliding with the side surface of.

本発明は、上述した事情に鑑みてなされたものであり、その目的は、転がり軸受の内外輪を安定に成形することができる製造方法を提供することにある。   This invention is made | formed in view of the situation mentioned above, The objective is to provide the manufacturing method which can shape | mold stably the inner and outer ring | wheel of a rolling bearing.

上記の目的は、本発明に係る下記（１）〜（１０）の転がり軸受の内外輪の製造方法により達成される。
（１）転がり軸受の内外輪の製造方法であって、大径の外輪部と小径の内輪部とを有し、該外輪部の一方の端部内周に該内輪部の一方の端部外周が連結されており、且つ該内輪部の他方の端部内周に底を有する成形品を成形する成形工程と、前記外輪部と前記内輪部との連結部位を切断して前記成形品を該外輪部および該内輪部に分離する分離工程と、前記分離工程の前または後で、前記内輪部の前記底を打ち抜く打ち抜き工程と、前記分離工程および前記打ち抜き工程を経て互いに分離された前記外輪部および前記内輪部をローリング成形により所定の形状に成形するローリング成形工程と、を備え、前記ローリング成形工程に供される前記内輪部において、その両端部のうち少なくとも前記底が形成されていた一方の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておくことを特徴とする転がり軸受の内外輪の製造方法。
（２）前記ローリング成形工程に供される前記内輪部において、前記第１端部の外周に小径段部を形成しておくことを特徴とする（１）に記載の転がり軸受の内外輪の製造方法。
（３）前記分離工程において、前記内輪部と前記外輪部との連結部位を切断したダイスとポンチとで該内輪部を挟圧し、それにより、該内輪部の前記第１端部を前記テーパ形状に成形することを特徴とする（１）または（２）に記載の転がり軸受の内外輪の製造方法。
（４）前記打ち抜き工程において、前記内輪部の前記底を打ち抜いたダイスとポンチとで該内輪部を挟圧し、それにより、該内輪部の前記第１端部を前記テーパ形状に成形することを特徴とする（１）または（２）に記載の転がり軸受の内外輪の製造方法。
（５）前記成形工程において、前記成形品を型鍛造により成形し、該型により前記内輪部の前記第１端部を前記テーパ形状に成形することを特徴とする（１）または（２）に記載の転がり軸受の内外輪の製造方法。
（６）転がり軸受の内外輪の製造方法であって、大径の外輪部と小径の内輪部とを有し、該外輪部の一方の端部内周に該内輪部の一方の端部外周が連結されており、且つ該内輪部の他方の端部内周に底を有する成形品を成形する成形工程と、前記外輪部と前記内輪部との連結部位を切断して前記成形品を該外輪部および該内輪部に分離する分離工程と、前記分離工程の前または後で、前記内輪部の前記底を打ち抜く打ち抜き工程と、前記分離工程および前記打ち抜き工程を経て互いに分離された前記外輪部および前記内輪部をローリング成形により所定の形状に成形するローリング成形工程と、を備え、前記ローリング成形工程に供される前記外輪部において、その両端部のうち少なくとも前記内輪部が連結されていた一方の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておくことを特徴とする転がり軸受の内外輪の製造方法。
（７）前記ローリング成形工程に供される前記外輪部において、前記第１端部の外周に小径段部を形成しておくことを特徴とする（６）に記載の転がり軸受の内外輪の製造方法。
（８）前記分離工程において、前記内輪部と前記外輪部との連結部位を切断したダイスとポンチとで該外輪部を挟圧し、それにより、該外輪部の前記第１端部を前記テーパ形状に成形することを特徴とする（６）または（７）に記載の転がり軸受の内外輪の製造方法。
（９）前記分離工程の前に前記打ち抜き工程を行い、前記打ち抜き工程において、前記内輪部の前記底を打ち抜いたダイスとポンチとで前記外輪部を挟圧し、それにより、該外輪部の前記第１端部を前記テーパ形状に成形することを特徴とする（６）または（７）に記載の転がり軸受の内外輪の製造方法。
（１０）前記成形工程において、前記成形品を型鍛造により成形し、該型により前記外輪部の前記第１端部を前記テーパ状に成形することを特徴とする（６）または（７）に記載の転がり軸受の内外輪の製造方法。 The above object is achieved by the following methods (1) to (10) for manufacturing inner and outer rings of a rolling bearing according to the present invention.
(1) A method for manufacturing inner and outer rings of a rolling bearing, comprising a large-diameter outer ring portion and a small-diameter inner ring portion, wherein one outer periphery of one end portion of the inner ring portion is disposed on one inner peripheral portion of the outer ring portion. A molding step of molding a molded product that is connected and has a bottom on the inner periphery of the other end of the inner ring portion; and a connecting portion between the outer ring portion and the inner ring portion is cut to remove the molded product from the outer ring portion. And a separation step of separating into the inner ring portion, a punching step of punching out the bottom of the inner ring portion before or after the separation step, and the outer ring portion separated from each other through the separation step and the punching step, and the A rolling forming step of forming the inner ring portion into a predetermined shape by rolling forming, and in the inner ring portion provided for the rolling forming step, at least the first of the two ends of the inner ring portion is formed. End, its end Manufacturing process of the inner and outer rings of the rolling bearing inner circumferential edge of which is characterized in that previously formed into a tapered shape to approach the second end of the other.
(2) The inner and outer rings of the rolling bearing according to (1), wherein a small-diameter step portion is formed on an outer periphery of the first end portion in the inner ring portion provided for the rolling forming step. Method.
(3) In the separation step, the inner ring portion is clamped with a die and a punch that cut the connection portion between the inner ring portion and the outer ring portion, and thereby the first end portion of the inner ring portion is tapered. The method for manufacturing inner and outer rings of a rolling bearing according to (1) or (2), wherein
(4) In the punching step, the inner ring portion is clamped by a die and a punch that punches the bottom of the inner ring portion, and thereby the first end portion of the inner ring portion is formed into the tapered shape. The manufacturing method of the inner and outer rings of the rolling bearing according to (1) or (2), which is characterized.
(5) In the molding step, the molded product is molded by die forging, and the first end portion of the inner ring portion is molded into the tapered shape by the die. The manufacturing method of the inner and outer rings of the rolling bearing described.
(6) A method for manufacturing inner and outer rings of a rolling bearing, comprising a large-diameter outer ring portion and a small-diameter inner ring portion, wherein one outer periphery of one end portion of the inner ring portion is disposed on one inner peripheral portion of the outer ring portion. A molding step of molding a molded product that is connected and has a bottom on the inner periphery of the other end of the inner ring portion; and a connecting portion between the outer ring portion and the inner ring portion is cut to remove the molded product from the outer ring portion. And a separation step of separating into the inner ring portion, a punching step of punching out the bottom of the inner ring portion before or after the separation step, and the outer ring portion separated from each other through the separation step and the punching step, and the A rolling molding step for molding the inner ring portion into a predetermined shape by rolling molding, and in the outer ring portion provided for the rolling molding step, at least one of the both ends of the inner ring portion is connected. One end Manufacturing process of the inner and outer rings of the rolling bearing, characterized in that the inner peripheral edge of the end face should be formed into a tapered shape to approach the second end of the other.
(7) Manufacturing of inner and outer rings of a rolling bearing according to (6), wherein a small-diameter step portion is formed on the outer periphery of the first end portion in the outer ring portion provided for the rolling forming step. Method.
(8) In the separation step, the outer ring portion is clamped with a die and a punch that cut the connection portion between the inner ring portion and the outer ring portion, whereby the first end of the outer ring portion is tapered. The method for manufacturing inner and outer rings of a rolling bearing according to (6) or (7), wherein
(9) The punching step is performed before the separation step, and in the punching step, the outer ring portion is clamped with a die and a punch that punches the bottom of the inner ring portion, and thereby the outer ring portion is One end is formed in the taper shape, The method for manufacturing inner and outer rings of a rolling bearing according to (6) or (7).
(10) In (6) or (7), in the forming step, the formed product is formed by die forging, and the first end portion of the outer ring portion is formed into the tapered shape by the die. The manufacturing method of the inner and outer rings of the rolling bearing described.

本発明に係る転がり軸受の内外輪の製造方法によれば、内輪部の底を打ち抜くことにより、底が形成されていた内輪部の第１端部の内周に凸状の段部が形成されるが、内輪部の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておくことにより、ローリング成形された際の偏肉を低減することができる。
同様に、内輪部との連結部位を切断することにより、内輪部が連結されていた外輪部の第１端部の内周に凸状の段部が形成されるが、外輪部の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておくことにより、ローリング成形された際の偏肉を低減することができる。
そのため、肉厚の均一化を図るために内輪部の第１端部および外輪部の第１端部の内周に形成される凸状の段部に対応してそれらの第１端部の外周に凹状の段部を形成せずともよく、内輪部および外輪部の外周面の母線を軸に平行な直線とすることができる。それにより、ローリング成形の際の内輪部および外輪部の傾きを防止して、マンドレルへの乗り上げやマンドレル側面との摺動による割れの発生を回避して、内輪部および外輪部を安定して成形することができる。 According to the method for manufacturing the inner and outer rings of the rolling bearing according to the present invention, the bottom of the inner ring portion is punched out, so that a convex step portion is formed on the inner periphery of the first end portion of the inner ring portion where the bottom is formed. However, by forming the first end portion of the inner ring portion into a tapered shape in which the inner peripheral edge of the end surface approaches the other second end portion, it is possible to reduce the uneven thickness when rolling. it can.
Similarly, by cutting the connecting portion with the inner ring portion, a convex step is formed on the inner periphery of the first end portion of the outer ring portion to which the inner ring portion is connected, but the first end of the outer ring portion is formed. By forming the portion into a tapered shape in which the inner peripheral edge of the end surface approaches the other second end portion, uneven thickness when rolling is formed can be reduced.
Therefore, in order to make the thickness uniform, the outer circumferences of the first end portions corresponding to the convex step portions formed on the inner circumference of the first end portion of the inner ring portion and the first end portion of the outer ring portion. It is not necessary to form a concave step portion on the inner ring portion, and the generatrix of the outer peripheral surface of the inner ring portion and the outer ring portion can be a straight line parallel to the axis. This prevents tilting of the inner and outer ring parts during rolling molding, avoids cracks due to riding on the mandrel and sliding with the side surfaces of the mandrel, and stably molding the inner and outer ring parts. can do.

また、本発明に係る転がり軸受の内外輪の製造方法では、肉厚の均一化を図るために内輪部の第１端部および外輪部の第１端部の内周に形成される凸状の段部に対応してそれらの第１端部の外周に凹状の小径段部を形成してもよい。この場合、ローリング成形の際に、内輪部および外輪部は傾くこととなるが、上記のとおり、内輪部の第１端部および外輪部の第１端部は、それらの端面の内周縁が第２端部に接近するテーパ形状に成形されていることから、マンドレルへの乗り上げやマンドレル側面との摺動による割れの発生は回避され、内輪部および外輪部を安定して成形することができる。   Moreover, in the manufacturing method of the inner and outer rings of the rolling bearing according to the present invention, a convex shape formed on the inner periphery of the first end portion of the inner ring portion and the first end portion of the outer ring portion in order to make the thickness uniform. A concave small-diameter step portion may be formed on the outer periphery of the first end portion corresponding to the step portion. In this case, the inner ring portion and the outer ring portion are inclined at the time of rolling molding. However, as described above, the inner peripheral edge of the first end portion of the inner ring portion and the first end portion of the outer ring portion is the first. Since it is formed into a tapered shape approaching the two end portions, occurrence of cracks due to riding on the mandrel and sliding with the side surface of the mandrel is avoided, and the inner ring portion and the outer ring portion can be stably formed.

そして、内輪部の第１端部および外輪部の第１端部のテーパ形状を、分離工程、打ち抜き工程、成形工程のいずれかにおいて同時に成形するようにすれば、工程数の増加を回避することができ、コストの削減に寄与することができて好ましい。   If the tapered shape of the first end portion of the inner ring portion and the first end portion of the outer ring portion is formed at the same time in any of the separation step, the punching step, and the forming step, an increase in the number of steps can be avoided. This is preferable because it can contribute to cost reduction.

以下、図を参照して本発明の好適な実施形態を説明する。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

（第１実施形態）
図１は本発明の転がり軸受の内外輪の製造方法の第１実施形態に係り、製造工程を示す図、図２は図１に示す製造工程において型鍛造を行う成形装置の断面図、図３は図１に示す製造工程においローリング成形を行う成形装置の断面図である。 (First embodiment)
FIG. 1 relates to a first embodiment of a method for manufacturing inner and outer rings of a rolling bearing according to the present invention, and shows a manufacturing process. FIG. 2 is a sectional view of a molding apparatus for performing die forging in the manufacturing process shown in FIG. FIG. 2 is a cross-sectional view of a molding apparatus that performs rolling molding in the manufacturing process shown in FIG. 1.

図１に示すように、本実施形態の転がり軸受の内外輪の製造方法は、１つの円柱状の材料から転がり軸受の内輪および外輪の２つの軌道輪を製造するものである。   As shown in FIG. 1, the manufacturing method of the inner and outer rings of the rolling bearing of the present embodiment manufactures two race rings, that is, an inner ring and an outer ring of the rolling bearing from one columnar material.

＜成形工程＞
まず、図１（Ａ）に示す円柱状の材料１は、高炭素クロム軸受鋼、肌焼鋼、機械構造用鋼、等の鋼材からなり、この材料１を、熱間加工または温間加工での据え込みにより、図１（Ｂ）に示すような外周面の母線形状が円弧をなす円盤状の中間成形品２を形成する（ステップＳ１）。 <Molding process>
First, the columnar material 1 shown in FIG. 1 (A) is made of a steel material such as high carbon chromium bearing steel, case-hardened steel, or steel for machine structural use, and this material 1 is obtained by hot working or warm working. As shown in FIG. 1B, a disk-shaped intermediate molded product 2 in which the generatrix of the outer peripheral surface forms an arc is formed (step S1).

そして、型鍛造により、中間成形品２から図１（Ｃ）に示す段付きの円筒状の成形品３を形成する（ステップＳ２）。図２に、中間成形品２の型鍛造を行う成形装置の一例を示す。図２（Ａ）に示す成形装置２０は、固定型２１と、可動型２２と、を備えている。   Then, a stepped cylindrical molded product 3 shown in FIG. 1C is formed from the intermediate molded product 2 by die forging (step S2). FIG. 2 shows an example of a molding apparatus that performs die forging of the intermediate molded product 2. A molding apparatus 20 shown in FIG. 2A includes a fixed mold 21 and a movable mold 22.

固定型２１は、段付き孔２３が形成されたダイ２４と、段付き孔２３内に配置された入れ駒２５と、を含んでいる。可動型２２は、ダイ２４の段付き孔２３の軸心上に配置され、ダイ２４に対して進退されるポンチ２６を有している。   The fixed die 21 includes a die 24 in which a stepped hole 23 is formed, and a slot 25 disposed in the stepped hole 23. The movable die 22 is disposed on the axis of the stepped hole 23 of the die 24 and has a punch 26 that moves forward and backward with respect to the die 24.

固定型２１のダイ２４は、孔２３ａが形成された第１ダイ２４ａと、孔２３ａより小径の孔２３ｂが形成された第２ダイ２４ｂと、を有している。第１ダイ２４ａおよび第２ダイ２４ｂが、それらの孔２３ａ，２３ｂの軸心を一致させて隣接して配置されることで段付き孔２３が形成されている。   The die 24 of the fixed mold 21 has a first die 24a in which a hole 23a is formed and a second die 24b in which a hole 23b having a smaller diameter than the hole 23a is formed. A stepped hole 23 is formed by arranging the first die 24a and the second die 24b adjacent to each other so that the axes of the holes 23a and 23b coincide with each other.

第１ダイ２４ａの大径孔２３ａ、および第２ダイ２４ｂの小径孔２３ｂの周面の母線は、軸と平行な直線に形成されている。また、第１ダイ２４ａと第２ダイ２４ｂとの間に形成される段２７は、その端面の内周縁が大径孔２３ａ側の段付き孔２３の開口に接近する向きに傾斜したテーパ形状に成形されている。   The generatrix of the peripheral surface of the large diameter hole 23a of the first die 24a and the small diameter hole 23b of the second die 24b is formed in a straight line parallel to the axis. Further, the step 27 formed between the first die 24a and the second die 24b has a tapered shape in which the inner peripheral edge of the end surface is inclined so as to approach the opening of the stepped hole 23 on the large-diameter hole 23a side. Molded.

固定型２１の入れ駒２５は、第２ダイ２４ｂの小径孔２３ｂ内に同軸に配置されており、不図示の押し出しピンにより押圧されて、軸方向に進退される。小径孔２３ｂに臨む入れ駒２５の端面の中心部には突部２８が形成されており、突部２８を囲む周縁部２９は、その端面の内周縁が段付き孔２３の上記開口に接近する向きに傾斜したテーパ形状に成形されている。   The insert piece 25 of the fixed die 21 is coaxially disposed in the small-diameter hole 23b of the second die 24b, is pressed by an unillustrated push pin, and is advanced and retracted in the axial direction. A protrusion 28 is formed at the center of the end face of the insert piece 25 facing the small-diameter hole 23 b, and the inner peripheral edge of the end face of the peripheral edge 29 surrounding the protrusion 28 approaches the opening of the stepped hole 23. It is formed into a tapered shape that is inclined in the direction.

可動型２２のポンチ２６には、基端側から第１突部３０と、その第１突部３０より小径に形成された第２突部３１と、が設けられている。第１突部３０および第２突部３１には抜き勾配が設けられ、先端に向かうに従って僅かに縮径するように成形されている。   The punch 26 of the movable mold 22 is provided with a first protrusion 30 and a second protrusion 31 having a smaller diameter than the first protrusion 30 from the base end side. The first projecting portion 30 and the second projecting portion 31 have a draft angle, and are formed so as to be slightly reduced in diameter toward the tip.

中間成形品２は、図２（Ａ）に示すように、ダイ２４の段付き孔２３にセットされ、固定型２１および可動型２２との間で熱間加工または温間加工で成形される。図２（Ｂ）はその成形状態を示し、中間成形品２は、ダイ２４によって外径を成形されると共に、固定型２１の入れ駒２５の突部２８および可動型２２のポンチ２６によって内径を成形される。詳細には、第１ダイ２４ａとポンチ２６の第１突部３０との間で大径の外輪部４が形成され、第２ダイ２４ｂとポンチ２６の第２突部３１および入れ駒２５の突部２８との間で小径の内輪部５が形成され、大径の外輪部４の一方の端部内周に小径の内輪部５の一方の端部外周が連結しており、また、内輪部５の他方の端部内周に底６が形成された段付きの円筒状の成形品３に成形される。   As shown in FIG. 2A, the intermediate molded product 2 is set in a stepped hole 23 of the die 24, and is molded between the fixed mold 21 and the movable mold 22 by hot working or warm working. FIG. 2B shows the molding state, and the intermediate molded product 2 has an outer diameter molded by the die 24 and an inner diameter by the protrusion 28 of the insertion piece 25 of the fixed mold 21 and the punch 26 of the movable mold 22. Molded. Specifically, the outer ring portion 4 having a large diameter is formed between the first die 24 a and the first protrusion 30 of the punch 26, and the second die 24 b and the second protrusion 31 of the punch 26 and the protrusion of the insert piece 25 are formed. A small-diameter inner ring portion 5 is formed between the inner ring portion 5 and the inner ring portion 5. One end outer periphery of the small-diameter inner ring portion 5 is connected to the inner periphery of one end portion of the large-diameter outer ring portion 4. Is formed into a stepped cylindrical molded product 3 having a bottom 6 formed on the inner periphery of the other end.

成形品３の外輪部４において、その外周面は、第１ダイ２４ａの大径孔２３ａに対応して軸と平行な直線状の母線で構成されており、その内周面は、ポンチ２６の第１突部３０の抜き勾配に対応した傾斜面とされている。また、内輪部５が連結されている一方の第１端部４ａは、ダイ２４の段２７により、その端面の内周縁が他方の第２端部４ｂに接近する向きに傾斜したテーパ形状に成形されている。尚、ポンチ２６の第１突部３０の付け根であって第２端部４ｂに接触するポンチ２６の肩３２をテーパ形状に成形することにより、第２端部４ｂをテーパ形状に成形してもよい。   In the outer ring portion 4 of the molded product 3, the outer peripheral surface is constituted by a straight bus bar parallel to the axis corresponding to the large-diameter hole 23 a of the first die 24 a, and the inner peripheral surface of the punch 26 is The inclined surface corresponds to the draft of the first protrusion 30. Also, one first end 4a to which the inner ring portion 5 is connected is formed into a tapered shape in which the inner peripheral edge of the end face is inclined by the step 27 of the die 24 so as to approach the other second end 4b. Has been. Even if the second end 4b is formed into a tapered shape by forming the shoulder 32 of the punch 26 that contacts the second end 4b at the base of the first protrusion 30 of the punch 26 into a tapered shape. Good.

また、成形品３の内輪部５において、その外周面は、第２ダイ２４ｂの小径孔２３ｂに対応して直線状の母線で構成されており、その内周面は、ポンチ２６の第２突部３１の抜き勾配に対応した傾斜面とされている。また、底６が形成されている一方の第１端部５ａは、入れ駒２５の周縁部２９により、その端面の内周縁が他方の第２端部５ｂに接近する向きに傾斜したテーパ形状に成形されている。尚、ポンチ２６の第２突部３１の付け根であって第２端部５ｂに接触する肩３３をテーパ形状に成形することにより、第２端部５ｂをテーパ形状に成形してもよい。   Further, in the inner ring portion 5 of the molded product 3, the outer peripheral surface thereof is constituted by a straight bus bar corresponding to the small diameter hole 23 b of the second die 24 b, and the inner peripheral surface thereof is the second protrusion of the punch 26. The inclined surface corresponds to the draft angle of the portion 31. Also, one first end portion 5a on which the bottom 6 is formed has a tapered shape in which the inner peripheral edge of the end surface is inclined by the peripheral edge portion 29 of the insert piece 25 so as to approach the other second end portion 5b. Molded. In addition, you may shape | mold the 2nd end part 5b in a taper-shape by shape | molding the shoulder 33 which contacts the 2nd end part 5b which is the root of the 2nd protrusion 31 of the punch 26 in a taper shape.

成形品３は、可動型２２が固定型２１の段付き孔２３から抜かれた後、入れ駒２５の移動によって固定型２１から取り出される。   The molded product 3 is taken out from the fixed mold 21 by the movement of the insert piece 25 after the movable mold 22 is pulled out from the stepped hole 23 of the fixed mold 21.

＜分離工程＞
次に、成形品３を外輪部４と内輪部５との連結部位で切断し、図１（Ｄ）に示すように、成形品３を外輪部４および内輪部５に分離する（ステップＳ３）。この切断に伴い、外輪部４の第１端部４ａの内周には、径方向内側に向けて凸となる段部４ｃが形成される。尚、成形品３の切断にはダイスおよびポンチを用いることができる。 <Separation process>
Next, the molded product 3 is cut at the connection portion between the outer ring portion 4 and the inner ring portion 5, and the molded product 3 is separated into the outer ring portion 4 and the inner ring portion 5 as shown in FIG. 1D (step S3). . Along with this cutting, a stepped portion 4c is formed on the inner periphery of the first end portion 4a of the outer ring portion 4 so as to protrude radially inward. A die and a punch can be used for cutting the molded product 3.

＜打ち抜き工程＞
次に、図１（Ｅ）に示すように、分離された内輪部５から底６を打ち抜く（ステップＳ４）。この打ち抜きに伴い、内輪部５の第１端部５ａの内周には、径方向内側に向けて凸となる段部５ｃが形成される。尚、打ち抜きには、ダイスおよびポンチを用いることができる。 <Punching process>
Next, as shown in FIG. 1E, the bottom 6 is punched from the separated inner ring portion 5 (step S4). Along with this punching, a stepped portion 5c is formed on the inner periphery of the first end portion 5a of the inner ring portion 5 so as to protrude radially inward. A die and punch can be used for punching.

＜ローリング成形工程＞
そして、図１（Ｆ）に示すように、外輪部４および内輪部５をローリング成形により所定の形状に成形する（ステップＳ５）。外輪部４のローリング成形を図３に示す。図３に示すように、成形ロール１１とマンドレル１２とで外輪部４を局部的に径方向に挟み、成形ロール１１を回転させて成形ロールとともに外輪部４を回転させる。回転する外輪部４にマンドレル１２を押し付けることにより、外輪部４を拡径させ、またマンドレル１２に形成された環状突起１３により外輪部４に軌道溝７（図１（Ｆ）参照）を転造している。 <Rolling molding process>
Then, as shown in FIG. 1 (F), the outer ring portion 4 and the inner ring portion 5 are formed into a predetermined shape by rolling (step S5). The rolling molding of the outer ring portion 4 is shown in FIG. As shown in FIG. 3, the outer ring portion 4 is locally sandwiched between the forming roll 11 and the mandrel 12, the forming roll 11 is rotated, and the outer ring portion 4 is rotated together with the forming roll. The mandrel 12 is pressed against the rotating outer ring portion 4 to increase the diameter of the outer ring portion 4, and the raceway groove 7 (see FIG. 1 (F)) is rolled into the outer ring portion 4 by the annular protrusion 13 formed on the mandrel 12. is doing.

ここで、図３に示すように、外輪部４の外周面の母線は軸と平行な直線であるから、成形ロール１１とマンドレル１２とで局部的に径方向に挟まれた際にも、外輪部４は傾くことなく成形ロール１１に支持される。そこで、外輪部４は安定に成形され、外輪部４のマンドレル１２への乗り上げやマンドレル１２の側面との摺動が回避される。   Here, as shown in FIG. 3, the generatrix of the outer peripheral surface of the outer ring portion 4 is a straight line parallel to the axis. Therefore, even when the forming roll 11 and the mandrel 12 are locally sandwiched in the radial direction, the outer ring The part 4 is supported by the forming roll 11 without tilting. Therefore, the outer ring portion 4 is stably formed, and the riding of the outer ring portion 4 onto the mandrel 12 and the sliding with the side surface of the mandrel 12 are avoided.

さらに、図３に示すように、外輪部４は、第１端部４ａの内周に径方向内側に向けて凸となる段部４ｃが形成されているが、第１端部４ａは、上記テーパ形状として段部４ｃによる第１端部４ａ側の肉量の増加を相殺するように成形されている。それにより、外輪部４の軸方向の中央を通る中心線Ｃ１を挟んで第１端部４ａ側と第２端部４ｂ側との体積が実質的に同一とされ、ローリング成形された際の偏肉が低減される。尚、第２端部４ｂもテーパ形状に成形する場合には、第２端部４ｂによっても第１端部４ａ側と第２端部４ｂ側との体積の調整が可能である。   Furthermore, as shown in FIG. 3, the outer ring portion 4 is formed with a step portion 4c that protrudes radially inward on the inner periphery of the first end portion 4a. The taper shape is formed so as to offset the increase in the amount of meat on the first end portion 4a side due to the stepped portion 4c. As a result, the first end 4a side and the second end 4b side have substantially the same volume across the center line C1 passing through the center of the outer ring portion 4 in the axial direction. Meat is reduced. In addition, when the 2nd end part 4b is also shape | molded in a taper shape, the volume of the 1st end part 4a side and the 2nd end part 4b side can be adjusted also by the 2nd end part 4b.

同様に、内輪部５の外周面の母線は軸と平行な直線であるから、成形ロール１１とマンドレル１２とで局部的に径方向に挟まれた際にも、内輪部５は傾くことなく成形ロール１１に支持される。そこで、内輪部５は安定に成形され、内輪部５のマンドレル１２への乗り上げやマンドレル１２の側面との摺動が回避される。   Similarly, since the generatrix of the outer peripheral surface of the inner ring portion 5 is a straight line parallel to the axis, the inner ring portion 5 is formed without tilting even when it is sandwiched radially between the forming roll 11 and the mandrel 12. Supported by the roll 11. Therefore, the inner ring portion 5 is stably molded, and the riding of the inner ring portion 5 onto the mandrel 12 and sliding with the side surface of the mandrel 12 are avoided.

さらに、内輪部５は、第１端部５ａの内周に径方向内側に向けて凸となる段部５ｃが形成されているが、第１端部５ａは、上記テーパ形状として段部５ｃによる第１端部５ａ側の肉量の増加を相殺するように成形されている。それにより、内輪部５の軸方向の中央を通る中心線を挟んで第１端部５ａ側と第２端部５ｂ側との体積が実質的に同一とされ、ローリング成形された際の偏肉が低減される。尚、第２端部５ｂもテーパ形状に成形する場合には、第２端部５ｂによっても第１端部５ａ側と第２端部５ｂ側との体積の調整が可能である。   Further, the inner ring portion 5 is formed with a step portion 5c that protrudes radially inward on the inner periphery of the first end portion 5a. The first end portion 5a is formed by the step portion 5c as a tapered shape. It is shaped so as to offset the increase in the amount of meat on the first end portion 5a side. As a result, the first end 5a side and the second end 5b side have substantially the same volume across the center line passing through the center in the axial direction of the inner ring portion 5, and the uneven thickness when rolling is performed. Is reduced. In addition, when the 2nd end part 5b is also shape | molded in a taper shape, the volume of the 1st end part 5a side and the 2nd end part 5b side can be adjusted also by the 2nd end part 5b.

そして、外輪部４の第１端部４ａおよび内輪部５の第１端部５ａの上記テーパ形状を、上記成形工程において同時に成形するようにしているので、工程数の増加が回避される。   And since the said taper shape of the 1st end part 4a of the outer ring | wheel part 4 and the 1st end part 5a of the inner ring | wheel part 5 is shape | molded simultaneously in the said formation process, the increase in the number of processes is avoided.

（第２実施形態）
図４は本発明の転がり軸受の内外輪の製造方法の第２実施形態に係り、製造工程を示す図、図５は図４に示す製造工程において型鍛造を行う成形装置の断面図、図６は図４に示す製造工程において成形品の切断を行う切断装置の断面図、図７は図４に示す製造工程において底を打ち抜く打ち抜き装置の断面図、図８は図４に示す製造工程においローリング成形を行う成形装置の断面図である。 (Second Embodiment)
FIG. 4 relates to a second embodiment of the manufacturing method of the inner and outer rings of the rolling bearing of the present invention, and is a diagram showing the manufacturing process. FIG. 5 is a cross-sectional view of a molding apparatus for performing die forging in the manufacturing process shown in FIG. 4 is a sectional view of a cutting device for cutting a molded product in the manufacturing process shown in FIG. 4, FIG. 7 is a sectional view of a punching device for punching the bottom in the manufacturing process shown in FIG. 4, and FIG. 8 is rolling in the manufacturing process shown in FIG. It is sectional drawing of the shaping | molding apparatus which shape | molds.

図４に示すように、本実施形態の転がり軸受の内外輪の製造方法は、１つの円柱状の材料から転がり軸受の内輪および外輪の２つの軌道輪を製造するものである。   As shown in FIG. 4, the manufacturing method of the inner and outer rings of the rolling bearing according to the present embodiment manufactures two race rings, that is, an inner ring and an outer ring of the rolling bearing from one columnar material.

＜成形工程＞
まず、図４（Ａ）に示す円柱状の材料１０１は、高炭素クロム軸受鋼、肌焼鋼、機械構造用鋼、等の鋼材からなり、この材料１０１を、熱間加工または温間加工での据え込みにより、図４（Ｂ）に示すような外周面の母線形状が円弧をなす円盤状の中間成形品１０２を形成する（ステップＳ１０１）。 <Molding process>
First, the columnar material 101 shown in FIG. 4 (A) is made of a steel material such as high carbon chromium bearing steel, case-hardened steel, steel for machine structural use, etc., and this material 101 is subjected to hot working or warm working. As shown in FIG. 4B, a disk-shaped intermediate molded product 102 in which the generatrix of the outer peripheral surface forms an arc is formed (step S101).

そして、型鍛造により、中間成形品１０２から図４（Ｃ）に示す段付きの円筒状の成形品１０３を形成する（ステップＳ１０２）。図５に中間成形品２の型鍛造を行う成形装置の一例を示す。図５（Ａ）に示す成形装置１２０は、固定型１２１と、可動型１２２と、を備えている。   Then, a stepped cylindrical molded product 103 shown in FIG. 4C is formed from the intermediate molded product 102 by die forging (step S102). FIG. 5 shows an example of a molding apparatus for performing die forging of the intermediate molded product 2. A molding apparatus 120 illustrated in FIG. 5A includes a fixed mold 121 and a movable mold 122.

固定型１２１は、段付き孔１２３が形成されたダイ１２４と、段付き孔１２３内に配置された入れ駒１２５と、を含んでいる。可動型１２２は、ダイ１２４の段付き孔１２３の軸心上に配置され、ダイ１２４に対して進退されるポンチ１２６を有している。   The fixed die 121 includes a die 124 in which a stepped hole 123 is formed, and a frame piece 125 disposed in the stepped hole 123. The movable mold 122 has a punch 126 that is disposed on the axis of the stepped hole 123 of the die 124 and is advanced and retracted with respect to the die 124.

固定型１２１のダイ１２４は、孔１２３ａが形成された第１ダイ１２４ａと、孔１２３ａより小径の孔１２３ｂが形成された第２ダイ１２４ｂと、を有している。第１ダイ１２４ａおよび第２ダイ１２４ｂが、それらの孔１２３ａ，１２３ｂの軸心を一致させて隣接して配置されることで段付き孔１２３が形成されている。   The die 124 of the fixed mold 121 includes a first die 124a in which a hole 123a is formed and a second die 124b in which a hole 123b having a smaller diameter than the hole 123a is formed. A stepped hole 123 is formed by arranging the first die 124a and the second die 124b adjacent to each other so that the axes of the holes 123a and 123b coincide with each other.

大径孔１２３ａを形成している第１ダイ１２４ａの内周面において、後述する外輪部１０４の第１端部１０４ａの外周を成形する部位には、径方向内側に向けて凸となる環状突起１３４が形成されており、また、小径孔１２３ｂを形成している第２ダイ１２４ｂの内周面において、後述する内輪部１０５の第１端部１０５ａの外周を成形する部位には、径方向内側に向けて凸となる環状突起１３５が形成されている。また、第１ダイ１２４ａと第２ダイ１２４ｂとの間の段１２７は、その端面が軸に直交する水平面となるように成形されている。   On the inner peripheral surface of the first die 124a forming the large-diameter hole 123a, an annular protrusion that protrudes radially inward at a portion that forms the outer periphery of the first end portion 104a of the outer ring portion 104 described later. 134 is formed on the inner peripheral surface of the second die 124b in which the small-diameter hole 123b is formed, and the outer periphery of the first end portion 105a of the inner ring portion 105 to be described later is formed on the radially inner side. An annular protrusion 135 that is convex toward the surface is formed. Further, the step 127 between the first die 124a and the second die 124b is formed so that the end surface thereof is a horizontal plane orthogonal to the axis.

固定型１２１の入れ駒１２５は、第２ダイ１２４ｂの小径孔１２３ｂ内に同軸に配置されており、不図示の押し出しピンにより押圧されて、軸方向に進退される。小径孔１２３ｂに臨む入れ駒１２５の端面の中心部には突部１２８が形成されており、突部１２８を囲む周縁部１２９は、その端面が軸に直交する水平面となるように成形されている。   The insert piece 125 of the fixed die 121 is coaxially disposed in the small-diameter hole 123b of the second die 124b, and is pushed and pushed back and forth in the axial direction by a push pin (not shown). A protrusion 128 is formed at the center of the end face of the insert piece 125 facing the small-diameter hole 123b, and a peripheral edge 129 surrounding the protrusion 128 is shaped so that the end face is a horizontal plane perpendicular to the axis. .

可動型１２２のポンチ１２６には、基端側から第１突部１３０と、その第１突部１３０より小径に形成された第２突部１３１と、が設けられている。第１突部１３０および第２突部１３１には抜き勾配が設けられ、先端に向かうに従って僅かに縮径するように成形されている。   The punch 126 of the movable mold 122 is provided with a first protrusion 130 and a second protrusion 131 having a smaller diameter than the first protrusion 130 from the base end side. The first protrusion 130 and the second protrusion 131 are provided with a draft angle and are formed so as to be slightly reduced in diameter toward the tip.

中間成形品１０２は、図５（Ａ）に示すように、ダイ１２４の段付き孔１２３にセットされ、固定型１２１および可動型１２２との間で熱間加工または温間加工で成形される。図５（Ｂ）はその成形状態を示し、中間成形品１０２は、ダイ１２４によって外径を成形されると共に、固定型１２１の入れ駒１２５の突部１２８および可動型１２２のポンチ１２６によって内径を成形される。詳細には、第１ダイ１２４ａとポンチ１２６の第１突部１３０との間で大径の外輪部１０４が形成され、第２ダイ１２４ｂとポンチ１２６の第２突部１３１および入れ駒１２５の突部１２８との間で小径の内輪部１０５が形成され、大径の外輪部１０４の一方の端部内周に小径の内輪部１０５の一方の端部外周が連結しており、また、内輪部１０５の他方の端部内周には底１０６が形成された段付きの円筒状の成形品１０３に成形される。   As shown in FIG. 5A, the intermediate molded product 102 is set in the stepped hole 123 of the die 124, and is molded between the fixed mold 121 and the movable mold 122 by hot working or warm working. FIG. 5B shows the molding state, and the intermediate molded product 102 has an outer diameter molded by the die 124 and an inner diameter by the protrusion 128 of the insert piece 125 of the fixed mold 121 and the punch 126 of the movable mold 122. Molded. More specifically, a large-diameter outer ring portion 104 is formed between the first die 124 a and the first protrusion 130 of the punch 126, and the protrusion of the second die 124 b and the second protrusion 131 of the punch 126 and the insert piece 125. An inner ring portion 105 having a small diameter is formed between the inner ring portion 105 and the outer ring portion 104 having a small diameter. The outer periphery of one end portion of the inner ring portion 105 having a small diameter is connected to the inner periphery of one end portion of the outer ring portion 104 having a large diameter. Is formed into a stepped cylindrical molded article 103 having a bottom 106 formed on the inner periphery of the other end thereof.

成形品１０３の外輪部１０４において、内輪部１０５が連結されている一方の第１端部１０４ａの外周には、第１ダイ１２４ａの環状突起１３４に対応して径方向内側に向けて凹となる小径段部１０４ｄが形成されている。尚、ダイ１２４の段１２７の端面が上記のとおり水平面とされているので、成形品１０３の状態で外輪部１０４の第１端部１０４ａも、その端面が軸に直交する水平面となるように成形されている。   In the outer ring portion 104 of the molded product 103, the outer periphery of the first end portion 104a to which the inner ring portion 105 is connected is concave toward the radially inner side corresponding to the annular protrusion 134 of the first die 124a. A small diameter step 104d is formed. Since the end surface of the step 127 of the die 124 is a horizontal plane as described above, the first end portion 104a of the outer ring portion 104 in the state of the molded product 103 is also molded so that the end surface is a horizontal plane orthogonal to the axis. Has been.

また、成形品１０３の内輪部１０５において、底１０６が形成されている一方の第１端部１０５ａの外周には、第２ダイ１２４ｂの環状突起１３５に対応して径方向内側に向けて凹となる小径段部１０５ｄが形成されている。尚、入れ駒１２５の周縁部１２９の端面が上記のとおり水平面とされているので、成形品１０３の状態で内輪部１０５の第１端部１０５ａも、その端面が軸に直交する水平面となるように成形されている。   Further, in the inner ring portion 105 of the molded product 103, the outer periphery of the first end portion 105a on which the bottom 106 is formed has a concave inward in the radial direction corresponding to the annular protrusion 135 of the second die 124b. A small diameter step portion 105d is formed. Since the end surface of the peripheral edge portion 129 of the insert piece 125 is a horizontal plane as described above, the first end portion 105a of the inner ring portion 105 in the state of the molded product 103 also has a horizontal plane orthogonal to the axis. It is molded into.

成形品１０３は、可動型１２２が固定型１２１の段付き孔１２３から抜かれた後、入れ駒１２５の移動によって固定型１２１から取り出される。   The molded product 103 is taken out from the fixed mold 121 by the movement of the insert piece 125 after the movable mold 122 is removed from the stepped hole 123 of the fixed mold 121.

＜分離工程＞
次に、成形品１０３を外輪部１０４と内輪部１０５との連結部位で切断し、図４（Ｄ）に示すように、成形品１０３を外輪部１０４および内輪部１０５に分離する（ステップＳ１０３）。成形品１０３を切断する切断装置の一例を図６に示す。図６（Ａ）に示す切断装置１４０は、成形品ダイス１４１と、ポンチ１４２と、を備えている。 <Separation process>
Next, the molded product 103 is cut at the connection portion between the outer ring portion 104 and the inner ring portion 105, and the molded product 103 is separated into the outer ring portion 104 and the inner ring portion 105 as shown in FIG. 4D (step S103). . An example of a cutting device for cutting the molded product 103 is shown in FIG. A cutting device 140 shown in FIG. 6A includes a molded product die 141 and a punch 142.

ダイス１４１には、成形品１０３を収容する収容孔１４３が形成されている。この収容孔１４３は、成形品１０３の外輪部１０４が配置される大径孔１４３ａ、および成形品１０３の内輪部１０５が配置される小径孔１４３ｂで構成されており、収容孔１４３を形成するダイス１４１の内周面における大径孔１４３ａと小径孔１４３ｂとの境界には段１４４が形成されている。成形品１０３は、内輪部１０５を先にして、大径孔１４３ａ側の開口から収容孔１４３に挿入され、外輪部１０４の第１端部１０４ａを段１４４に載置させる。ダイス１４１の段１４４は、その端面の内周縁が、収容孔１４３の挿入開口に接近する向きに傾斜したテーパ形状に成形されており、その内周縁に切断刃が設けられている。   In the die 141, an accommodation hole 143 for accommodating the molded product 103 is formed. The housing hole 143 includes a large-diameter hole 143a in which the outer ring portion 104 of the molded product 103 is disposed and a small-diameter hole 143b in which the inner ring portion 105 of the molded product 103 is disposed, and a die that forms the housing hole 143. A step 144 is formed at the boundary between the large diameter hole 143a and the small diameter hole 143b on the inner peripheral surface of 141. The molded product 103 is inserted into the accommodation hole 143 from the opening on the large-diameter hole 143a side with the inner ring portion 105 first, and the first end 104a of the outer ring portion 104 is placed on the step 144. The step 144 of the die 141 is formed in a tapered shape in which the inner peripheral edge of the end surface is inclined in a direction approaching the insertion opening of the accommodation hole 143, and a cutting blade is provided on the inner peripheral edge.

ポンチ１４２は、ダイス１４１の収容孔１４３の軸心上に配置され、ダイス１４１に対して進退される。このポンチ１４２には、収容孔１４３の大径孔１４３ａに進入する基部１４５と、基部１４５の先端に突設されて収容孔１４３の小径孔１４３ｂに進入する突部１４６と、が設けられており、突部１４６の端面の内周縁に切断刃が設けられている。   The punch 142 is disposed on the axial center of the accommodation hole 143 of the die 141 and is advanced and retracted with respect to the die 141. The punch 142 is provided with a base 145 that enters the large-diameter hole 143 a of the accommodation hole 143, and a projection 146 that projects from the tip of the base 145 and enters the small-diameter hole 143 b of the accommodation hole 143. A cutting blade is provided on the inner peripheral edge of the end surface of the protrusion 146.

図６（Ｂ）に示すように、ポンチ１４２が移動され、成形品１０３の外輪部１０４と内輪部１０５との連結部位が、ダイス１４１の段１４４に設けられた切断刃とポンチ１４２の突部１４６に設けられた切断刃とによって切断され、成形品１０３は、外輪部１０４および内輪部１０５に分離される。この切断に伴い、外輪部１０４の第１端部１０４ａの内周には、径方向内側に向けて凸となる段部１０４ｃが形成される。   As shown in FIG. 6B, the punch 142 is moved, and the connecting portion between the outer ring portion 104 and the inner ring portion 105 of the molded product 103 is connected to the cutting blade provided on the step 144 of the die 141 and the protrusion of the punch 142. The molded product 103 is separated into an outer ring portion 104 and an inner ring portion 105 by cutting with a cutting blade provided at 146. Along with this cutting, a stepped portion 104c that protrudes radially inward is formed on the inner periphery of the first end portion 104a of the outer ring portion 104.

本実施形態では、外輪部１０４と内輪部１０５との連結部位を切断した後、さらにポンチ１４２を移動させ、図６（Ｃ）に示すように、ダイス１４１の段１４４とポンチ１４２の突部１４６の付け根である肩１４７とで外輪部１０４を挟圧している。ダイス１４１の段１４４に接触している外輪部１０４の第１端部１０４ａは、段１４４により、その端面の内周縁が他方の第２端部１０４ｂに接近する向きに傾斜したテーパ形状に成形される。尚、外輪部１０４の第２端部１０４ｂに接触するポンチ１４２の肩１４７をテーパ形状に成形することにより、第２端部１０４ｂをテーパ形状に成形してもよい。   In the present embodiment, after cutting the connecting portion between the outer ring portion 104 and the inner ring portion 105, the punch 142 is further moved, and as shown in FIG. 6C, the step 144 of the die 141 and the protrusion 146 of the punch 142. The outer ring portion 104 is clamped by the shoulder 147 which is the root of the outer ring. The first end 104a of the outer ring portion 104 that is in contact with the step 144 of the die 141 is formed by the step 144 into a tapered shape in which the inner peripheral edge of the end surface is inclined so as to approach the other second end 104b. The In addition, you may shape | mold the 2nd end part 104b in a taper-shape by shape | molding the shoulder 147 of the punch 142 which contacts the 2nd end part 104b of the outer ring | wheel part 104 in a taper shape.

＜打ち抜き工程＞
次に、図４（Ｅ）に示すように、分離された内輪部１０５から底１０６を打ち抜く（ステップＳ１０４）。図７に内輪部１０５から底１０６を打ち抜く打ち抜き装置の一例を示す。図７（Ａ）に示す打ち抜き装置１６０は、ダイス１６１と、ポンチ１６２と、を備えている。 <Punching process>
Next, as shown in FIG. 4E, the bottom 106 is punched from the separated inner ring portion 105 (step S104). FIG. 7 shows an example of a punching device for punching the bottom 106 from the inner ring portion 105. A punching device 160 illustrated in FIG. 7A includes a die 161 and a punch 162.

ダイス１６１には、分離された内輪部１０５を収容する収容孔１６３が形成されている。この収容孔１６３は、内輪部１０５が配置される大径孔１６３ａ、および内輪部１０５から打ち抜かれた底１０６を収容する小径孔１６３ｂで構成されており、収容孔１６３を形成するダイス１６１の内周面における大径孔１６３ａと小径孔１６３ｂとの境界には段１６４が形成されている。内輪部１０５は、内周に底１０６が形成されている第１端部１０５ａを先にして、大径孔１６３ａ側の開口から収容孔１６３に挿入され、第１端部１０５ａを段１６４に載置させる。ダイス１６１の段１６４は、その端面の内周縁が、収容孔１６３の挿入開口に接近する向きに傾斜したテーパ形状に成形されており、その内周縁に切断刃が設けられている。   The die 161 is formed with an accommodation hole 163 for accommodating the separated inner ring portion 105. The accommodation hole 163 includes a large-diameter hole 163a in which the inner ring portion 105 is disposed, and a small-diameter hole 163b that accommodates the bottom 106 punched out from the inner ring portion 105, and the inside of the die 161 that forms the accommodation hole 163. A step 164 is formed at the boundary between the large diameter hole 163a and the small diameter hole 163b on the peripheral surface. The inner ring portion 105 is inserted into the accommodation hole 163 from the opening on the large-diameter hole 163a side, with the first end portion 105a having the bottom 106 formed on the inner periphery first, and the first end portion 105a is mounted on the step 164. Let me put it. The step 164 of the die 161 is formed in a tapered shape in which the inner peripheral edge of the end surface is inclined in a direction approaching the insertion opening of the accommodation hole 163, and a cutting blade is provided on the inner peripheral edge.

ポンチ１６２は、ダイス１６１の収容孔１６３の軸心上に配置され、ダイス１６１に対して進退される。このポンチ１６２には、収容孔１６３の大径孔１６３ａに進入する基部１６５と、基部１６５の先端に突設されて収容孔１６３の小径孔１６３ｂに進入する突部１６６と、が設けられており、突部１６６の端面の内周縁に切断刃が設けられている。   The punch 162 is disposed on the axis of the accommodation hole 163 of the die 161 and is advanced and retracted with respect to the die 161. The punch 162 is provided with a base 165 that enters the large-diameter hole 163 a of the accommodation hole 163, and a projection 166 that projects from the tip of the base 165 and enters the small-diameter hole 163 b of the accommodation hole 163. A cutting blade is provided on the inner peripheral edge of the end surface of the protrusion 166.

図７（Ｂ）に示すように、ポンチ１６２が移動され、内輪部１０５の第１端部１０５ａと底１０６との連結部位が、ダイス１６１の段１６４に設けられた切断刃とポンチ１６２の突部１６６に設けられた切断刃とによって切断され、底１０６が打ち抜かれる。この切断に伴い、内輪部１０５の第１端部１０５ａの内周には、径方向内側に向けて凸となる段部１０５ｃが形成される。   As shown in FIG. 7B, the punch 162 is moved, and the connecting portion between the first end portion 105a of the inner ring portion 105 and the bottom 106 has a protrusion between the cutting blade provided on the step 164 of the die 161 and the punch 162. The bottom 106 is punched out by cutting with a cutting blade provided in the portion 166. Along with this cutting, a stepped portion 105c that protrudes radially inward is formed on the inner periphery of the first end portion 105a of the inner ring portion 105.

本実施形態では、底１０６を打ち抜いた後、さらにポンチ１６２を移動させ、図７（Ｃ）に示すように、ダイス１６１の段１６４とポンチ１６２の突部１６６の付け根である肩１６７とで内輪部１０５を挟圧している。ダイス１６１の段１６４に接触している内輪部１０５の第１端部１０５ａは、段１６４により、その端面の内周縁が他方の第２端部１０５ｂに接近する向きに傾斜したテーパ形状に成形される。尚、内輪部１０５の第２端部１０５ｂに接触するポンチ１６２の肩１６７をテーパ形状に成形することにより、第２端部１０５ｂをテーパ形状に成形してもよい。   In this embodiment, after punching the bottom 106, the punch 162 is further moved, and as shown in FIG. 7C, the inner ring is formed by the step 164 of the die 161 and the shoulder 167 that is the root of the protrusion 166 of the punch 162. The portion 105 is clamped. The first end portion 105a of the inner ring portion 105 that is in contact with the step 164 of the die 161 is formed by the step 164 into a tapered shape in which the inner peripheral edge of the end surface is inclined so as to approach the other second end portion 105b. The In addition, you may shape | mold the 2nd end part 105b in a taper-shape by shape | molding the shoulder 167 of the punch 162 which contacts the 2nd end part 105b of the inner ring | wheel part 105 in a taper shape.

＜ローリング成形工程＞
そして、図４（Ｆ）に示すように、外輪部１０４および内輪部１０５をローリング成形により所定の形状に成形する。外輪部１０４のローリング成形を図８に示す。図８に示すように、成形ロール１１とマンドレル１２とで外輪部１０４を局部的に径方向に挟み、成形ロール１１を回転させて成形ロールとともに外輪部１０４を回転させる。回転する外輪部１０４にマンドレル１２を押し付けることにより、外輪部１０４を拡径させ、またマンドレル１２に形成された環状突起１３により外輪部１０４に軌道溝１０７（図４（Ｆ）参照）を転造している。 <Rolling molding process>
Then, as shown in FIG. 4F, the outer ring portion 104 and the inner ring portion 105 are formed into a predetermined shape by rolling. The rolling forming of the outer ring portion 104 is shown in FIG. As shown in FIG. 8, the outer ring portion 104 is locally sandwiched between the forming roll 11 and the mandrel 12 in the radial direction, and the forming roll 11 is rotated to rotate the outer ring portion 104 together with the forming roll. The mandrel 12 is pressed against the rotating outer ring portion 104 to increase the diameter of the outer ring portion 104, and the raceway groove 107 (see FIG. 4F) is rolled into the outer ring portion 104 by the annular protrusion 13 formed on the mandrel 12. is doing.

ここで、図８に示すように、外輪部１０４の第１端部１０４ａの外周には径方向内側に向けて凹となる小径段部１０４ｄが設けられているため、成形ロール１１とマンドレル１２とで局部的に径方向に挟まれた際に外輪部１０４は傾いてしまう。しかしながら、外輪部１０４の第１端部１０４ａは、その端面の内周縁が第２端部１０４ｂに接近する向きに傾斜したテーパ形状に形成されおり、外輪部１０４が傾いた状態でも、その端面はマンドレル１２の周面に対して略直交するように配置される。そこで、外輪部１０４のマンドレル１２への乗り上げやマンドレル１２の側面との摺動が回避される。   Here, as shown in FIG. 8, the outer periphery of the first end portion 104 a of the outer ring portion 104 is provided with a small-diameter stepped portion 104 d that is concave inward in the radial direction, so that the forming roll 11, the mandrel 12, Therefore, the outer ring portion 104 is inclined when it is sandwiched locally in the radial direction. However, the first end portion 104a of the outer ring portion 104 is formed in a tapered shape in which the inner peripheral edge of the end surface is inclined so as to approach the second end portion 104b, and even when the outer ring portion 104 is inclined, the end surface is It arrange | positions so that it may substantially orthogonally cross with respect to the surrounding surface of the mandrel 12. FIG. Therefore, riding on the mandrel 12 of the outer ring portion 104 and sliding with the side surface of the mandrel 12 are avoided.

さらに、図８に示すように、外輪部１０４は、第１端部１０４ａの内周に径方向内側に向けて凸となる段１０４ｃが形成されているが、第１端部１０４ａは、上記テーパ形状として段１０４ｃによる第１端部１０４ａ側の肉量の増加を相殺するように成形されている。それにより、外輪部１０４の軸方向の中央を通る中心線を挟んで第１端部１０４ａ側と第２端部１０４ｂ側との体積が実質的に同一とされ、ローリング成形された際の偏肉が低減される。   Further, as shown in FIG. 8, the outer ring portion 104 is formed with a step 104c that protrudes radially inward on the inner periphery of the first end portion 104a. The first end portion 104a has the above tapered shape. The shape is formed so as to offset the increase in the amount of meat on the first end 104a side due to the step 104c. As a result, the first end 104a side and the second end 104b side have substantially the same volume across the center line passing through the center of the outer ring portion 104 in the axial direction. Is reduced.

同様に、内輪部１０５の第１端部１０５ａの外周には径方向内側に向けて凹となる小径段部１０５ｄが設けられているため、成形ロール１１とマンドレル１２とで局部的に径方向に挟まれた際に内輪部１０５は傾いてしまう。しかしながら、内輪部１０５の第１端部１０５ａは、その端面の内周縁が第２端部１０５ｂに接近する向きに傾斜したテーパ形状に形成されおり、内輪部１０５が傾いた状態でも、その端面はマンドレル１２の周面に対して略直交するように配置される。そこで、内輪部１０５のマンドレル１２への乗り上げやマンドレル１２の側面との摺動が回避される。   Similarly, the outer periphery of the first end portion 105a of the inner ring portion 105 is provided with a small-diameter step portion 105d that is concave inward in the radial direction, so that the forming roll 11 and the mandrel 12 locally in the radial direction. When pinched, the inner ring portion 105 is inclined. However, the first end portion 105a of the inner ring portion 105 is formed in a tapered shape in which the inner peripheral edge of the end surface is inclined so as to approach the second end portion 105b, and even when the inner ring portion 105 is inclined, the end surface is It arrange | positions so that it may substantially orthogonally cross with respect to the surrounding surface of the mandrel 12. FIG. Therefore, riding on the mandrel 12 of the inner ring portion 105 and sliding with the side surface of the mandrel 12 are avoided.

さらに、内輪部１０５は、第１端部１０５ａの内周に径方向内側に向けて凸となる段１０５ｃが形成されているが、１端部１０５ａは、上記テーパ形状として段１０５ｃによる第１端部１０５ａ側の肉量の増加を相殺するように成形されている。それにより、内輪部１０５の軸方向の中央を通る中心線を挟んで第１端部１０５ａ側と第２端部１０５ｂ側との体積が実質的に同一とされ、ローリング成形された際の偏肉が低減される。   Further, the inner ring portion 105 is formed with a step 105c that protrudes radially inward on the inner periphery of the first end portion 105a. The one end portion 105a has a tapered shape as the first end by the step 105c. It is shaped so as to offset the increase in the amount of meat on the part 105a side. As a result, the first end 105a side and the second end 105b side have substantially the same volume across the center line passing through the center in the axial direction of the inner ring part 105, and uneven thickness when rolling is formed. Is reduced.

そして、外輪部１０４の第１端部１０４ａの上記テーパ形状を分離工程において同時に成形し、また、内輪部１０５の第１端部１０５ａの上記テーパ形状を打ち抜き工程において同時に成形するようにしているので、工程数の増加が回避される。   And since the said taper shape of the 1st end part 104a of the outer ring | wheel part 104 is shape | molded simultaneously in a isolation | separation process, and the said taper shape of the 1st end part 105a of the inner ring | wheel part 105 is shape | molded simultaneously in a punching process. , An increase in the number of steps is avoided.

次に、図９を参照して、上述した第２実施形態の転がり軸受の内外輪の製造方法の変形例を説明する。尚、上述した第２実施形態の製造方法と共通する部材等には、同一符号を付すことにより、説明を省略あるいは簡略する。   Next, with reference to FIG. 9, the modification of the manufacturing method of the inner and outer ring | wheel of the rolling bearing of 2nd Embodiment mentioned above is demonstrated. In addition, description is abbreviate | omitted or simplified by attaching | subjecting the same code | symbol to the member etc. which are common in the manufacturing method of 2nd Embodiment mentioned above.

本変形例の転がり軸受の内外輪の製造方法では、成形品１０３を外輪部１０４および内輪部１０５に分離する前に、内輪部１０５から底１０６を打ち抜いており（ステップＳ１０４´）、その後に、外輪部１０４と内輪部１０３との連結部位を切断するようにしている（ステップＳ１０３´）。   In the manufacturing method of the inner and outer rings of the rolling bearing of this modification, the bottom 106 is punched out from the inner ring part 105 before separating the molded product 103 into the outer ring part 104 and the inner ring part 105 (step S104 ′). The connecting portion between the outer ring portion 104 and the inner ring portion 103 is cut (step S103 ′).

そして、底１０６を打ち抜く打ち抜き工程において、外輪部１０４の第１端部１０４ａの上記テーパ形状を成形しており、また、成形品１０３を外輪部１０４および内輪部１０５に分離する分離工程において、内輪部１０５の第１端部１０５ａの上記テーパ形状を成形している。   In the punching process for punching the bottom 106, the tapered shape of the first end 104a of the outer ring part 104 is formed, and in the separation process for separating the molded product 103 into the outer ring part 104 and the inner ring part 105, the inner ring The tapered shape of the first end portion 105a of the portion 105 is formed.

本変形例の転がり軸受の内外輪の製造方法の作用効果は、上述した第２実施形態の製造方法と同様であるので、説明を省略する。   Since the operation and effect of the method for manufacturing the inner and outer rings of the rolling bearing of the present modification are the same as those of the manufacturing method of the second embodiment described above, the description thereof is omitted.

以上、説明したとおり、本発明に係る転がり軸受の内外輪の製造方法によれば、内輪部の底を打ち抜くことにより、底が形成されていた内輪部の第１端部の内周に凸状の段部が形成されるが、内輪部の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておくことにより、ローリング成形された際の偏肉を低減することができる。
同様に、内輪部との連結部位を切断することにより、内輪部が連結されていた外輪部の第１端部の内周に凸状の段部が形成されるが、外輪部の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておくことにより、ローリング成形された際の偏肉を低減することができる。
そのため、肉厚の均一化を図るために内輪部の第１端部および外輪部の第１端部の内周に形成される凸状の段部に対応してそれらの第１端部の外周に凹状の段部を形成せずともよく、内輪部および外輪部の外周面の母線を軸に平行な直線とすることができる。それにより、ローリング成形の際の内輪部および外輪部の傾きを防止して、マンドレルへの乗り上げやマンドレル側面との摺動による割れの発生を回避して、内輪部および外輪部を安定して成形することができる。 As described above, according to the manufacturing method of the inner and outer rings of the rolling bearing according to the present invention, the bottom of the inner ring portion is punched out so that the inner periphery of the first end portion of the inner ring portion on which the bottom is formed is convex. However, the first end portion of the inner ring portion is formed into a tapered shape in which the inner peripheral edge of the end surface approaches the other second end portion. Meat can be reduced.
Similarly, by cutting the connecting portion with the inner ring portion, a convex step is formed on the inner periphery of the first end portion of the outer ring portion to which the inner ring portion is connected, but the first end of the outer ring portion is formed. By forming the portion into a tapered shape in which the inner peripheral edge of the end surface approaches the other second end portion, uneven thickness when rolling is formed can be reduced.
Therefore, in order to make the thickness uniform, the outer circumferences of the first end portions corresponding to the convex step portions formed on the inner circumference of the first end portion of the inner ring portion and the first end portion of the outer ring portion. It is not necessary to form a concave step portion on the inner ring portion, and the generatrix of the outer peripheral surface of the inner ring portion and the outer ring portion can be a straight line parallel to the axis. This prevents tilting of the inner and outer ring parts during rolling molding, avoids cracks due to riding on the mandrel and sliding with the side surfaces of the mandrel, and stably molding the inner and outer ring parts. can do.

また、本発明に係る転がり軸受の内外輪の製造方法では、肉厚の均一化を図るために内輪部の第１端部および外輪部の第１端部の内周に形成される凸状の段部に対応してそれらの第１端部の外周に凹状の小径段部を形成してもよい。この場合、ローリング成形の際に、内輪部および外輪部は傾くこととなるが、上記のとおり、内輪部の第１端部および外輪部の第１端部は、それらの端面の内周縁が第２端部に接近するテーパ形状に成形されていることから、マンドレルへの乗り上げやマンドレル側面との摺動による割れの発生は回避され、内輪部および外輪部を安定して成形することができる。   Moreover, in the manufacturing method of the inner and outer rings of the rolling bearing according to the present invention, a convex shape formed on the inner periphery of the first end portion of the inner ring portion and the first end portion of the outer ring portion in order to make the thickness uniform. A concave small-diameter step portion may be formed on the outer periphery of the first end portion corresponding to the step portion. In this case, the inner ring portion and the outer ring portion are inclined at the time of rolling molding. However, as described above, the inner peripheral edge of the first end portion of the inner ring portion and the first end portion of the outer ring portion is the first. Since it is formed into a tapered shape approaching the two end portions, occurrence of cracks due to riding on the mandrel and sliding with the side surface of the mandrel is avoided, and the inner ring portion and the outer ring portion can be stably formed.

そして、内輪部の第１端部および外輪部の第１端部のテーパ形状を、分離工程、打ち抜き工程、成形工程のいずれかにおいて同時に成形するようにすれば、工程数の増加を回避することができ、コストの削減に寄与することができて好ましい。   If the tapered shape of the first end portion of the inner ring portion and the first end portion of the outer ring portion is formed at the same time in any of the separation step, the punching step, and the forming step, an increase in the number of steps can be avoided. This is preferable because it can contribute to cost reduction.

本発明の転がり軸受の内外輪の製造方法の第１実施形態に係り、製造工程を示す図である。It is a figure which shows the manufacturing process in connection with 1st Embodiment of the manufacturing method of the inner and outer ring | wheel of the rolling bearing of this invention. 図１に示す製造工程において型鍛造を行う成形装置の断面図である。It is sectional drawing of the shaping | molding apparatus which performs die forging in the manufacturing process shown in FIG. 図１に示す製造工程においローリング成形を行う成形装置の断面図である。It is sectional drawing of the shaping | molding apparatus which performs rolling shaping | molding in the manufacturing process shown in FIG. 本発明の転がり軸受の内外輪の製造方法の第２実施形態に係り、製造工程を示す図である。It is a figure which shows the manufacturing process in connection with 2nd Embodiment of the manufacturing method of the inner and outer ring | wheel of the rolling bearing of this invention. 図４に示す製造工程において型鍛造を行う成形装置の断面図である。It is sectional drawing of the shaping | molding apparatus which performs die forging in the manufacturing process shown in FIG. 図４に示す製造工程において成形品の切断を行う切断装置の断面図である。It is sectional drawing of the cutting device which cut | disconnects a molded article in the manufacturing process shown in FIG. 図４に示す製造工程において底を打ち抜く打ち抜き装置の断面図である。It is sectional drawing of the punching apparatus which punches a bottom in the manufacturing process shown in FIG. 図４に示す製造工程においローリング成形を行う成形装置の断面図である。It is sectional drawing of the shaping | molding apparatus which performs rolling shaping | molding in the manufacturing process shown in FIG. 図４に示す転がり軸受の内外輪の製造方法の変形例に係り、製造工程を示す図である。It is a figure which shows the manufacturing process in connection with the modification of the manufacturing method of the inner / outer ring of the rolling bearing shown in FIG. 従来の転がり軸受の内外輪の製造方法に係り、製造工程を示す図である。It is a figure which shows the manufacturing process in connection with the manufacturing method of the inner and outer ring | wheel of the conventional rolling bearing. 図１０に示す製造工程においてローリング成形を行う成形装置の断面図である。It is sectional drawing of the shaping | molding apparatus which performs rolling shaping | molding in the manufacturing process shown in FIG. 従来のローリング成形の課題を示す断面図である。It is sectional drawing which shows the subject of the conventional rolling molding. 従来のローリング成形の課題を示す断面図である。It is sectional drawing which shows the subject of the conventional rolling molding.

符号の説明Explanation of symbols

３ 成形品
４ 外輪部
４ａ 外輪部の第１端部
４ｂ 外輪部の第２端部
４ｄ 外輪部の小径段部
５ 内輪部
５ａ 内輪部の第１端部
５ｂ 内輪部の第２端部
５ｄ 内輪部の小径段部
６ 底 3 molded product 4 outer ring portion 4a first end portion of outer ring portion 4b second end portion of outer ring portion 4d small diameter step portion of outer ring portion 5 inner ring portion 5a first end portion of inner ring portion 5b second end portion of inner ring portion 5d inner ring Small diameter step of the part 6 Bottom

Claims (10)

転がり軸受の内外輪の製造方法であって、
大径の外輪部と小径の内輪部とを有し、該外輪部の一方の端部内周に該内輪部の一方の端部外周が連結されており、且つ該内輪部の他方の端部内周に底を有する成形品を成形する成形工程と、
前記外輪部と前記内輪部との連結部位を切断して前記成形品を該外輪部および該内輪部に分離する分離工程と、
前記分離工程の前または後で、前記内輪部の前記底を打ち抜く打ち抜き工程と、
前記分離工程および前記打ち抜き工程を経て互いに分離された前記外輪部および前記内輪部をローリング成形により所定の形状に成形するローリング成形工程と、
を備え、
前記ローリング成形工程に供される前記内輪部において、その両端部のうち少なくとも前記底が形成されていた一方の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておく
ことを特徴とする転がり軸受の内外輪の製造方法。 A method for manufacturing inner and outer rings of a rolling bearing,
The outer ring portion has a large-diameter outer ring portion and a small-diameter inner ring portion, and one end inner periphery of the inner ring portion is connected to the inner periphery of one end of the outer ring portion, and the inner periphery of the other end of the inner ring portion A molding step of molding a molded product having a bottom on
A separation step of cutting the connecting portion between the outer ring portion and the inner ring portion to separate the molded product into the outer ring portion and the inner ring portion;
Before or after the separation step, a punching step of punching the bottom of the inner ring portion;
A rolling molding step of molding the outer ring portion and the inner ring portion separated from each other through the separation step and the punching step into a predetermined shape by rolling molding;
With
In the inner ring portion to be subjected to the rolling forming step, at least one of the two end portions of the first end portion where the bottom is formed is tapered such that the inner peripheral edge of the end surface approaches the other second end portion. A method for manufacturing inner and outer rings of a rolling bearing, characterized by being formed into a shape. 前記ローリング成形工程に供される前記内輪部において、前記第１端部の外周に小径段部を形成しておくことを特徴とする請求項１に記載の転がり軸受の内外輪の製造方法。   2. The method for manufacturing an inner and outer ring of a rolling bearing according to claim 1, wherein a small-diameter step portion is formed on an outer periphery of the first end portion in the inner ring portion provided for the rolling forming step. 前記分離工程において、前記内輪部と前記外輪部との連結部位を切断したダイスとポンチとで該内輪部を挟圧し、それにより、該内輪部の前記第１端部を前記テーパ形状に成形することを特徴とする請求項１または請求項２に記載の転がり軸受の内外輪の製造方法。   In the separation step, the inner ring portion is clamped with a die and a punch that cut the connection portion between the inner ring portion and the outer ring portion, thereby forming the first end portion of the inner ring portion into the tapered shape. The method for manufacturing the inner and outer rings of the rolling bearing according to claim 1 or 2. 前記打ち抜き工程において、前記内輪部の前記底を打ち抜いたダイスとポンチとで該内輪部を挟圧し、それにより、該内輪部の前記第１端部を前記テーパ形状に成形することを特徴とする請求項１または請求項２に記載の転がり軸受の内外輪の製造方法。   In the punching step, the inner ring portion is clamped with a die and punch punched out from the bottom of the inner ring portion, and thereby the first end portion of the inner ring portion is formed into the tapered shape. A method for manufacturing the inner and outer rings of the rolling bearing according to claim 1 or 2. 前記成形工程において、前記成形品を型鍛造により成形し、該型により前記内輪部の前記第１端部を前記テーパ形状に成形することを特徴とする請求項１または請求項２に記載の転がり軸受の内外輪の製造方法。   3. The rolling according to claim 1, wherein, in the forming step, the formed product is formed by die forging, and the first end portion of the inner ring portion is formed into the tapered shape by the die. Manufacturing method for bearing inner and outer rings. 転がり軸受の内外輪の製造方法であって、
大径の外輪部と小径の内輪部とを有し、該外輪部の一方の端部内周に該内輪部の一方の端部外周が連結されており、且つ該内輪部の他方の端部内周に底を有する成形品を成形する成形工程と、
前記外輪部と前記内輪部との連結部位を切断して前記成形品を該外輪部および該内輪部に分離する分離工程と、
前記分離工程の前または後で、前記内輪部の前記底を打ち抜く打ち抜き工程と、
前記分離工程および前記打ち抜き工程を経て互いに分離された前記外輪部および前記内輪部をローリング成形により所定の形状に成形するローリング成形工程と、
を備え、
前記ローリング成形工程に供される前記外輪部において、その両端部のうち少なくとも前記内輪部が連結されていた一方の第１端部を、その端面の内周縁が他方の第２端部に接近するテーパ形状に成形しておく
ことを特徴とする転がり軸受の内外輪の製造方法。 A method for manufacturing inner and outer rings of a rolling bearing,
The outer ring portion has a large-diameter outer ring portion and a small-diameter inner ring portion, and one end inner periphery of the inner ring portion is connected to the inner periphery of one end of the outer ring portion, and the inner periphery of the other end of the inner ring portion A molding step of molding a molded product having a bottom on
A separation step of cutting the connecting portion between the outer ring portion and the inner ring portion to separate the molded product into the outer ring portion and the inner ring portion;
Before or after the separation step, a punching step of punching the bottom of the inner ring portion;
A rolling molding step of molding the outer ring portion and the inner ring portion separated from each other through the separation step and the punching step into a predetermined shape by rolling molding;
With
In the outer ring portion to be subjected to the rolling molding step, at least one of the two end portions to which the inner ring portion is connected, the inner peripheral edge of the end surface approaches the other second end portion. A method for manufacturing inner and outer rings of a rolling bearing, wherein the method is formed into a tapered shape. 前記ローリング成形工程に供される前記外輪部において、前記第１端部の外周に小径段部を形成しておくことを特徴とする請求項６に記載の転がり軸受の内外輪の製造方法。   The method for manufacturing inner and outer rings of a rolling bearing according to claim 6, wherein a small-diameter step portion is formed on an outer periphery of the first end portion in the outer ring portion provided for the rolling forming step. 前記分離工程において、前記内輪部と前記外輪部との連結部位を切断したダイスとポンチとで該外輪部を挟圧し、それにより、該外輪部の前記第１端部を前記テーパ形状に成形することを特徴とする請求項６または請求項７に記載の転がり軸受の内外輪の製造方法。   In the separation step, the outer ring portion is clamped with a die and a punch that cut the connection portion between the inner ring portion and the outer ring portion, thereby forming the first end portion of the outer ring portion into the tapered shape. The method for manufacturing the inner and outer rings of a rolling bearing according to claim 6 or 7, wherein: 前記分離工程の前に前記打ち抜き工程を行い、
前記打ち抜き工程において、前記内輪部の前記底を打ち抜いたダイスとポンチとで前記外輪部を挟圧し、それにより、該外輪部の前記第１端部を前記テーパ形状に成形することを特徴とする請求項６または請求項７に記載の転がり軸受の内外輪の製造方法。 Performing the punching step before the separation step,
In the punching step, the outer ring portion is clamped with a die and punch punched out from the bottom of the inner ring portion, and thereby the first end portion of the outer ring portion is formed into the tapered shape. A method for manufacturing the inner and outer rings of the rolling bearing according to claim 6 or 7. 前記成形工程において、前記成形品を型鍛造により成形し、該型により前記外輪部の前記第１端部を前記テーパ状に成形することを特徴とする請求項６または請求項７に記載の転がり軸受の内外輪の製造方法。   The rolling according to claim 6 or 7, wherein, in the forming step, the formed product is formed by die forging, and the first end portion of the outer ring portion is formed into the tapered shape by the die. Manufacturing method for bearing inner and outer rings.
JP2007125757A 2007-05-10 2007-05-10 Method for manufacturing inner race and outer race of rolling bearing Pending JP2008279481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007125757A JP2008279481A (en) 2007-05-10 2007-05-10 Method for manufacturing inner race and outer race of rolling bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007125757A JP2008279481A (en) 2007-05-10 2007-05-10 Method for manufacturing inner race and outer race of rolling bearing

Publications (1)

Publication Number Publication Date
JP2008279481A true JP2008279481A (en) 2008-11-20

Family

ID=40140748

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007125757A Pending JP2008279481A (en) 2007-05-10 2007-05-10 Method for manufacturing inner race and outer race of rolling bearing

Country Status (1)

Country Link
JP (1) JP2008279481A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102847862A (en) * 2012-11-06 2013-01-02 苏州汉金模具技术有限公司 Low-pressure composite forging process for bearing ring
CN105057556A (en) * 2015-08-14 2015-11-18 浙江五洲新春集团股份有限公司 Forging molding process of bearing ring
CN105964853A (en) * 2016-06-20 2016-09-28 安徽省瑞杰锻造有限责任公司 Free forging process of GCr15 bearing ring
CN112404337A (en) * 2020-10-21 2021-02-26 洛阳市洛凌轴承科技股份有限公司 NU2300 series bearing sleeve forging process

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102847862A (en) * 2012-11-06 2013-01-02 苏州汉金模具技术有限公司 Low-pressure composite forging process for bearing ring
CN105057556A (en) * 2015-08-14 2015-11-18 浙江五洲新春集团股份有限公司 Forging molding process of bearing ring
CN105964853A (en) * 2016-06-20 2016-09-28 安徽省瑞杰锻造有限责任公司 Free forging process of GCr15 bearing ring
CN105964853B (en) * 2016-06-20 2018-01-23 安徽省瑞杰锻造有限责任公司 The free forging process of GCr15 bearing rings
CN112404337A (en) * 2020-10-21 2021-02-26 洛阳市洛凌轴承科技股份有限公司 NU2300 series bearing sleeve forging process
CN112404337B (en) * 2020-10-21 2024-04-12 洛阳市洛凌轴承科技股份有限公司 NU2300 series bearing sleeve forging process

Similar Documents

Publication Publication Date Title
JP5309690B2 (en) Manufacturing method of inner and outer rings of rolling bearing
CA2263929C (en) Method and device for forming blanks for bearing rings
JP5803127B2 (en) Method of manufacturing a rough profile for a bearing ring of a rolling bearing
JP2010529383A (en) Method of manufacturing a rolling bearing without machining
US20150336155A1 (en) Method for forming a pressed component, method for manufacturing a pressed component, and die apparatus for forming a pressed component
JP2008302403A (en) Method for producing inner ring and outer ring of rolling bearing
JP2011025312A (en) Method and apparatus for manufacturing inner and outer ring
JP2018012109A (en) Method for manufacturing cylindrical ring member
JP2008279481A (en) Method for manufacturing inner race and outer race of rolling bearing
JP2000205273A (en) Retainer of roller bearing and manufacture of retainer
JP5737371B2 (en) Manufacturing method of outer ring of rolling bearing unit for wheel support
JP2007130673A (en) Manufacturing method of outer and inner ring of bearing race using in bearing steel pipe
JP2009039759A (en) Method of manufacturing outer ring for rolling bearing
JP3720567B2 (en) Material for forming bearing profile
JP2008221244A (en) Apparatus for stably holding narrow width product in upsetting by horizontal forging machine
JP5556297B2 (en) Manufacturing method of bearing ring member of rolling bearing unit for supporting wheel
JP6123917B2 (en) Manufacturing method of annular member
JP2007009989A (en) Cage for tapered roller bearing and its manufacturing method
JP2007130655A (en) Punch having deformation-preventive function for ring with flange
US9587679B2 (en) Method and apparatus for manufacturing rolling-element bearing
EP3628413B1 (en) Molding device for manufacturing cylindrical rolling body, manufacturing method for cylindrical rolling body, manufacturing method for rolling bearing, manufacturing method for vehicle, and manufacturing method for mechanical apparatus
JP2001018032A (en) Manufacture of flanged shaft, and manufacturing device used therefor
JP2007303536A (en) Manufacturing method of retainer for conical roller bearing
JP3720564B2 (en) Manufacturing method of bearing shape material
JP2010194580A (en) Method of manufacturing shaft-shaped member with projection