JP2008128256A - Method of manufacturing bearing ring member - Google Patents

Method of manufacturing bearing ring member Download PDF

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JP2008128256A
JP2008128256A JP2006309916A JP2006309916A JP2008128256A JP 2008128256 A JP2008128256 A JP 2008128256A JP 2006309916 A JP2006309916 A JP 2006309916A JP 2006309916 A JP2006309916 A JP 2006309916A JP 2008128256 A JP2008128256 A JP 2008128256A
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axial direction
intermediate material
manufacturing
ring member
peripheral surface
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JP2008128256A5 (en
JP4674580B2 (en
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Kazuto Kobayashi
一登 小林
Hiroshi Koyama
寛 小山
Yutaka Yasuda
裕 安田
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NSK Ltd
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved method of manufacturing a bearing ring member such as a hub having a supporting flange on the outer peripheral face at its axial outward portion and double-row outer ring raceways on the inner peripheral face for securing the rolling fatigue lives of both bearing rings. <P>SOLUTION: In the method of manufacturing the bearing ring member, a raw material 16 is machined into a fourth intermediate raw material 20 through a (A) to (B) first upsetting step, a (B) to (C) shearing and extrusion step, a (C) to (D) second upsetting step, and a (D) to (E) punching step. In the shearing and extrusion step, a second intermediate raw material 18 is obtained which has a main cylindrical portion 36 around a sectionally circular recessed hole 37 open to the other axial end face. In the second upsetting step, part of a metal material is moved outward in the radial direction to form a supporting flange 7a. In a portion of the fourth intermediate raw material 20 where the outer ring raceways 5, 5 should be formed, the metal material 13 for the radial intermediate portion out of the metal material constituting the raw material 16 exists to secure the rolling fatigue lives of both raceways. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、自動車の車輪及びブレーキディスク等の制動用回転部材を懸架装置に対して回転自在に支持する為に利用する、車輪支持用転がり軸受ユニットを構成する軌道輪部材の製造方法の改良に関する。本発明の製造方法の対象となる軌道輪は、内周面の軸方向2個所位置に複列の外輪軌道を、外周面のうちでこれら両外輪軌道同士の間の中央位置よりも軸方向一端寄り部分に外向フランジを、それぞれ備えたものである。この様な軌道輪部材は、上記車輪支持用転がり軸受ユニットが内輪回転型の場合には、懸架装置に結合固定される外輪が、同じく外輪回転型の場合には、車輪を支持固定した状態でこの車輪と共に回転するハブが、それぞれ相当する。更には、上記車輪支持用転がり軸受ユニットが内輪回転型で駆動輪用の場合には、内輪と組み合わされてハブを構成するハブ本体も、上記軌道輪部材となり得る。   The present invention relates to an improvement in a manufacturing method of a bearing ring member constituting a wheel bearing rolling bearing unit, which is used for rotatably supporting a braking rotary member such as a vehicle wheel and a brake disk with respect to a suspension device. . The bearing ring that is the object of the manufacturing method of the present invention has two rows of outer ring raceways at two positions in the axial direction of the inner peripheral surface, and one end in the axial direction from the center position between the outer ring raceways on the outer peripheral surface. Each side part is provided with an outward flange. Such a ring member has a state in which the wheel is supported and fixed when the outer ring coupled to the suspension device is the outer ring rotating type when the wheel bearing rolling bearing unit is the inner ring rotating type. Hubs rotating with the wheels correspond to each. Furthermore, in the case where the wheel supporting rolling bearing unit is an inner ring rotating type and used for a driving wheel, a hub main body that constitutes a hub in combination with the inner ring can also be the bearing ring member.

自動車の車輪を構成するホイール、及び、制動用回転部材であるディスク或いはドラムを懸架装置を構成するナックルに回転自在に支持する為に、車輪支持用転がり軸受ユニットが広く使用されている。この様な車輪支持用転がり軸受ユニットとして一般的には、図6に示した内輪回転型のものが使用されているが、一部では、図7に示した様な外輪回転型のものも使用されている。   In order to rotatably support a wheel constituting a wheel of an automobile and a disk or drum which is a rotating member for braking on a knuckle constituting a suspension device, a wheel bearing rolling bearing unit is widely used. As such a wheel-supporting rolling bearing unit, the inner ring rotating type as shown in FIG. 6 is generally used, but in some cases, the outer ring rotating type as shown in FIG. 7 is also used. Has been.

先ず、図6に示した内輪回転型の車輪支持用転がり軸受ユニット1は、外輪2の内径側にハブ3を、複数の転動体4、4を介して、回転自在に支持している。使用状態では、上記外輪2を上記ナックルに結合固定し、上記ハブ3に車輪及び制動用回転部材を支持固定する。この為に、上記外輪2の内周面の2個所位置に複列の外輪軌道5、5を、外周面の軸方向内寄り部分(軸方向に関して内とは、使用状態で車体の幅方向中央側となる側を言い、図1〜5、10の下側、図6〜8の右側。反対に、使用状態で車体の幅方向外側となる、図1〜5、10の上側、図6〜8の左側を、軸方向に関して外と言う。本明細書全体で同じ。)に、特許請求の範囲に記載した外向フランジである取付部6を、それぞれ形成している。一方、上記ハブ3の外周面には、上記外輪2よりも軸方向外方に突出した外端寄り部分に、車輪及び制動用回転部材を支持固定する為の支持フランジ7を、軸方向中間部乃至内端寄り部分に複列の内輪軌道8、8を、それぞれ形成している。そして、これら両列の内輪軌道8、8と上記両列の外輪軌道5、5との間に、両列毎に複数個ずつの転動体4、4を配置して、上記外輪2の内径側での上記ハブ3の回転を自在としている。   First, the inner ring rotating type wheel support rolling bearing unit 1 shown in FIG. 6 supports the hub 3 on the inner diameter side of the outer ring 2 via a plurality of rolling elements 4 and 4 so as to be rotatable. In the use state, the outer ring 2 is coupled and fixed to the knuckle, and the wheel and the brake rotating member are supported and fixed to the hub 3. For this purpose, the double-row outer ring raceways 5 and 5 are arranged at two positions on the inner peripheral surface of the outer ring 2 in the axially inward portion of the outer peripheral surface. 1 to 5, the lower side of Fig. 1 to 10, the right side of Fig. 6 to 8. Conversely, the upper side of Figs. The left side of 8 is referred to as “outside in the axial direction. The same applies throughout the present specification”), and mounting portions 6 that are outward flanges described in the claims are formed respectively. On the other hand, on the outer peripheral surface of the hub 3, a support flange 7 for supporting and fixing the wheel and the rotating member for braking is provided on an outer end portion projecting outward in the axial direction from the outer ring 2. Or the inner ring raceways 8 and 8 of the double row are formed in the part near an inner end, respectively. A plurality of rolling elements 4, 4 are arranged for each row between the inner ring raceways 8, 8 in both rows and the outer ring raceways 5, 5 in both rows, and the inner diameter side of the outer race 2 is arranged. The hub 3 can be freely rotated.

又、図7に示した、外輪回転型の車輪支持用転がり軸受ユニット1aは、それぞれの外周面に内輪軌道8、8を形成した1対の内輪9、9の周囲にハブ10を、複数個の転動体4、4を介して回転自在に支持している。使用状態では上記両内輪9、9を、懸架装置に設けた車軸に外嵌固定し、上記ハブ10に車輪及び制動用回転部材を支持固定する。この為にこのハブ10の内周面の2個所位置に複列の外輪軌道5、5を、外周面の軸方向外寄り部分に、特許請求の範囲に記載した外向フランジである支持フランジ7aを、それぞれ形成している。そして、上記両列の内輪軌道8、8と上記両列の外輪軌道5、5との間に、両列毎に複数個ずつの転動体4、4を配置して、上記両内輪9、9の外径側での上記ハブ10の回転を自在としている。尚、図示の例では、転動体4、4として玉を示したが、重量の嵩む車両用の車輪支持用転がり軸受ユニットの場合には、転動体として円すいころを使用する場合もある。   Further, the outer ring rotating type wheel bearing rolling bearing unit 1a shown in FIG. 7 includes a plurality of hubs 10 around a pair of inner rings 9, 9 having inner ring raceways 8, 8 formed on the outer peripheral surfaces thereof. The rolling elements 4 and 4 are rotatably supported. In use, both the inner rings 9, 9 are externally fitted and fixed to an axle provided in the suspension device, and the wheel and the braking rotating member are supported and fixed to the hub 10. For this purpose, double-row outer ring raceways 5 and 5 are provided at two positions on the inner peripheral surface of the hub 10, and support flanges 7 a that are outward flanges described in the claims are provided at axially outer portions of the outer peripheral surface. , Each formed. A plurality of rolling elements 4, 4 are arranged for each row between the inner ring raceways 8, 8 in both rows and the outer ring raceways 5, 5 in both rows. The hub 10 can be freely rotated on the outer diameter side. In the illustrated example, balls are shown as the rolling elements 4, 4. However, in the case of a rolling bearing unit for supporting a wheel for a heavy vehicle, a tapered roller may be used as the rolling element.

図6に示した車輪支持用転がり軸受ユニット1を構成する外輪2、或いは、図7に示した車輪支持用転がり軸受ユニット1aを構成するハブ10の如き、内周面の軸方向2個所位置に複列の外輪軌道を、外周面のうちでこれら両外輪軌道同士の間の中央位置よりも軸方向一端寄り部分に外向フランジを、それぞれ備えた軌道輪部材は、鍛造加工と切削加工及び研削加工とを組み合わせて造る。例えば、特許文献1には、図8に示す様な、駆動輪用で内輪回転型の車輪支持用転がり軸受ユニット1bを構成する外輪2a、及び、内輪9aと組み合わされてハブ3aを構成するハブ本体11の加工方法に就いて記載されている。即ち、上記ハブ本体11は、図9の(A)に示す様な工程により、上記外輪2aは、図9の(B)に示す様な工程により、それぞれ素材に鍛造加工を施して完成品に近い形状を有する中間素材とする。そして、この中間素材に、必要な切削加工及び研削加工を施して、上記外輪2a或いは上記ハブ本体11とする。   The outer ring 2 constituting the wheel supporting rolling bearing unit 1 shown in FIG. 6 or the hub 10 constituting the wheel supporting rolling bearing unit 1a shown in FIG. 7 is positioned at two axial positions on the inner peripheral surface. The outer ring member of the double row has an outward flange at a portion closer to one end in the axial direction than the center position between the outer ring tracks on the outer peripheral surface, and each of the bearing ring members includes forging, cutting and grinding. And combined with. For example, in Patent Document 1, as shown in FIG. 8, a hub that forms a hub 3a in combination with an outer ring 2a that constitutes a wheel support rolling bearing unit 1b for an inner ring rotation type and a driving wheel, as shown in FIG. The processing method of the main body 11 is described. That is, the hub body 11 is forged by the process as shown in FIG. 9A, and the outer ring 2a is forged into the finished product by the process as shown in FIG. 9B. The intermediate material has a close shape. Then, the intermediate material is subjected to necessary cutting and grinding to form the outer ring 2a or the hub body 11.

ところで、車輪支持用転がり軸受ユニット用の軌道輪部材を造る為の素材は、鉄鋼メーカーで押し出し成形された、断面円形の長尺材を所定長さに切断する事で造られた、円柱状のものを使用する。この様にして得られる円柱状の素材の組成(清浄度)は均一でない事が、特許文献2に記載される等により、従来から知られている。即ち、上記素材の中央部40%の範囲(中心から半径の40%までの中央寄り円柱状部分)は、非金属介在物が存在し易い事が、上記特許文献2に記載される等により、従来から知られている。又、上記素材の外径寄り20%の範囲(中心から半径の80%よりも外周面側に存在する円筒状部分)に関しても、酸化物や非金属介在物が存在し易い等により、清浄度が低い事が知られている。そして、中心寄り、外周面寄り、何れの部分に存在する金属材料にしても、清浄度が低い金属材料が軌道輪部材の周面に設けた軌道面のうちで、特に転動体の転動面が転がり接触する部分に露出すると、この部分の転がり疲れ寿命の確保が難しくなる。   By the way, the material for making a bearing ring member for a wheel bearing rolling bearing unit is a cylindrical shape made by cutting a long material with a circular cross section into a predetermined length extruded by a steel manufacturer. Use things. It has been conventionally known that the composition (cleanliness) of the columnar material obtained in this way is not uniform, as described in Patent Document 2. That is, in the range of 40% of the central portion of the material (a columnar portion near the center from the center to 40% of the radius), non-metallic inclusions are likely to be present, as described in Patent Document 2, etc. Conventionally known. In addition, the cleanliness of the range of 20% closer to the outer diameter of the material (cylindrical portion existing on the outer peripheral surface side than 80% of the radius from the center) is due to the presence of oxides and non-metallic inclusions. Is known to be low. Of the raceway surfaces provided on the circumferential surface of the raceway ring member, the rolling surface of the rolling element, in particular, a metal material having a low degree of cleanness, even if the metal material is present in any portion near the center or the outer circumference surface. When exposed to the portion that comes into contact with rolling, it becomes difficult to ensure the rolling fatigue life of this portion.

これらの事を考慮し、且つ、素材中の酸化物や非金属介在物の分布のばらつきや、製造作業時に発生する(押圧力等の)各種ばらつきを考慮した場合、上記素材の中央部50%の範囲、及び、上記素材の外径寄り30%の範囲に存在する金属材料が、軌道面のうちで、少なくとも転動面が転がり接触する部分に露出しない様にする事が好ましい。言い換えれば、上記軌道面のうちの少なくとも転動面が転がり接触する部分には、上記素材のうちで、中心からの半径が50〜70%の範囲である、中間円筒状部分に存在する金属材料を露出させる事が好ましい。   In consideration of these things, and taking into account variations in the distribution of oxides and non-metallic inclusions in the material and various variations (such as pressing force) that occur during manufacturing operations, the central portion of the material is 50%. It is preferable that the metal material existing in the range of 30% and the outer diameter of the material in the range of 30% is not exposed to at least the portion of the raceway where the rolling surface is in rolling contact. In other words, a metal material existing in an intermediate cylindrical portion having a radius from the center of 50 to 70% of the above-mentioned material is a portion of the raceway surface where the rolling contact surface is in rolling contact. It is preferable to expose.

ところが、本発明の製造方法の対象となる様な、周面の軸方向2個所位置に複列の軌道を、外周面のうちでこれら両軌道同士の間の中央位置よりも軸方向一端寄り部分に外向フランジを、それぞれ備えた軌道輪部材を鍛造加工により造る場合、上記中間円筒状部分を上記両軌道面に露出させる事が難しい。例えば、前記特許文献2に記載された様な方法で、前記図7に示した車輪支持用転がり軸受ユニット1aのハブ10を造ると、素材中の各部の金属材料、即ち、中心から半径の50%までの中央寄り円柱状部分の金属材料12と、中心からの半径が50〜70%の範囲である、中間円筒状部分に存在する金属材料13と、外径寄り30%の範囲の外径寄り円筒状部分に存在する金属材料14とは、図10に示す様に、上記ハブ10中に分布する。このハブ10は、鍛造加工により図10に実線で示した中間素材15を造った後、切削加工及び研削加工により、この図10に鎖線で示す状態にまで上記中間素材15を削り取り、上記ハブ10として完成する。   However, as shown in the manufacturing method of the present invention, two rows of orbits are arranged at two positions in the axial direction of the peripheral surface, and a portion closer to one end in the axial direction than the central position between these two tracks on the outer peripheral surface. When the ring members having the outward flanges are made by forging, it is difficult to expose the intermediate cylindrical portion on both the raceway surfaces. For example, when the hub 10 of the wheel bearing rolling bearing unit 1a shown in FIG. 7 is manufactured by the method described in Patent Document 2, the metal material of each part in the material, that is, the radius 50 from the center. % Of the metal material 12 in the cylindrical portion close to the center, the metal material 13 existing in the intermediate cylindrical portion whose radius from the center is in the range of 50 to 70%, and the outer diameter in the range of 30% near the outer diameter. As shown in FIG. 10, the metal material 14 existing in the inclined cylindrical portion is distributed in the hub 10. The hub 10 is made by forging the intermediate material 15 shown by the solid line in FIG. 10, and then cutting and grinding the intermediate material 15 to the state shown by the chain line in FIG. 10 by cutting and grinding. To be completed.

この様な中間素材15とハブ10とを示した図10中、斜格子で示した、上記中間円筒状部分に存在する金属材料13が、1対の外輪軌道5、5部分に露出すれば、これら両外輪軌道5、5の転がり疲れ寿命を確保し、上記ハブ10を含む上記車輪支持用転がり軸受ユニット1aの耐久性確保を図り易くなる。ところが、上記図10から明らかな通り、従来の製造方法により上記ハブ10を造ると、上記中央寄り円柱状部分の金属材料12が、上記両外輪軌道5、5の表面に露出する。即ち、軸方向外側の外輪軌道5に関しては、その全体に上記中央寄り円柱状部分の金属材料12が露出する。又、軸方向内側の外輪軌道5に関しても、転動体の接触角の方向(転動体荷重の作用方向)に関して、上記中央寄り円柱状部分の金属材料12が露出若しくは表層部に存在する状態となる。この為、従来から知られている軌道輪部材の製造方法では、上記車輪支持用転がり軸受ユニット1aの耐久性確保を図る為の設計の自由度が限られる。   In FIG. 10 showing such an intermediate material 15 and the hub 10, if the metal material 13 present in the intermediate cylindrical portion shown by the oblique lattice is exposed to the pair of outer ring raceways 5 and 5, The rolling fatigue life of these outer ring raceways 5 and 5 is ensured, and the durability of the wheel support rolling bearing unit 1a including the hub 10 can be easily ensured. However, as is apparent from FIG. 10, when the hub 10 is manufactured by the conventional manufacturing method, the metal material 12 in the central cylindrical portion is exposed on the surfaces of the outer ring raceways 5 and 5. That is, with respect to the outer ring raceway 5 on the outer side in the axial direction, the metal material 12 of the cylindrical portion near the center is exposed on the whole. Further, the outer ring raceway 5 on the inner side in the axial direction is also in a state in which the metal material 12 of the cylindrical portion closer to the center is exposed or exists in the surface layer part with respect to the direction of the contact angle of the rolling element (the direction of the rolling element load). . For this reason, in a conventionally known method for manufacturing a bearing ring member, the degree of freedom in design for ensuring the durability of the wheel bearing rolling bearing unit 1a is limited.

特開2005−83513号公報JP 2005-83513 A 特開2006−250317号公報JP 2006-250317 A

本発明は、上述の様な事情に鑑みて、内外両周面のうちの何れかの周面の軸方向2個所位置に複列の軌道を、外周面のうちでこれら両軌道同士の間の中央位置よりも軸方向一端寄り部分に外向フランジを、それぞれ備えた軌道輪部材を、円柱状の素材を塑性変形させる事により造る場合に、上記両軌道のうち、少なくとも転動体荷重が作用する部分に、素材のうちで清浄度の高い中間円筒状部分の金属材料を露出させられる、軌道輪部材の製造方法を実現すべく発明したものである。   In view of the circumstances as described above, the present invention provides a double-row orbit at two positions in the axial direction of either of the inner and outer peripheral surfaces, and between these two orbits on the outer peripheral surface. In the case where a ring member having an outward flange at a position closer to one end in the axial direction than the center position is made by plastically deforming a cylindrical material, at least a portion where the rolling element load acts on both the tracks. Furthermore, the present invention was invented to realize a method for manufacturing a bearing ring member in which a metal material of an intermediate cylindrical portion having a high cleanliness among the raw materials can be exposed.

本発明の軌道輪部材の製造方法は、円柱状の素材を塑性変形させる事により、内外両周面のうちの何れかの周面の軸方向2個所位置に複列の軌道を、外周面のうちでこれら両軌道同士の間の中央位置よりも軸方向一端寄り部分に外向フランジを、それぞれ備えた軌道輪部材とする。
特に、請求項1に記載した軌道輪部材の製造方法に於いては、第一の据え込み工程と、剪断・押し出し工程と、第二の据え込み工程とを備える。
このうちの第一の据え込み工程では、上記素材を軸方向に押し潰して、第一中間素材とする。
又、上記剪断・押し出し工程では、ダイスにより周囲を囲まれる空間内で上記第一中間素材を、1対のパンチにより軸方向に押圧し、軸方向他端面に開口する断面円形の凹孔を有し、この凹孔の周囲を円筒部とした第二中間素材とする。
更に、上記第二の据え込み工程では、この第二中間素材の軸方向一端寄り部分を軸方向に圧縮して金属材料を径方向外方に移動させ、上記外向フランジを形成する。
In the method of manufacturing the race ring member of the present invention, a cylindrical material is plastically deformed, so that a double-row raceway is formed at two positions in the axial direction of any of the inner and outer peripheral surfaces. Among these, the ring member is provided with an outward flange at a portion closer to one end in the axial direction than the center position between the two tracks.
In particular, the method for manufacturing a bearing ring member according to claim 1 includes a first upsetting step, a shearing / extruding step, and a second upsetting step.
In the first upsetting process, the material is crushed in the axial direction to obtain a first intermediate material.
Further, in the shearing / extrusion step, the first intermediate material is pressed in the axial direction by a pair of punches in a space surrounded by a die, and has a concave hole with a circular cross section that opens on the other end surface in the axial direction. The second intermediate material having a cylindrical portion around the concave hole is used.
Further, in the second upsetting step, the portion of the second intermediate material near one end in the axial direction is compressed in the axial direction to move the metal material radially outward to form the outward flange.

上述の様な本発明の軌道輪部材の製造方法を実施する場合に、好ましくは、請求項2に記載した様に、上記軌道輪部材の内外両周面のうちの何れかの周面を内周面とし、この内周面の軸方向2個所位置に複列の外輪軌道を設ける。
この様な請求項2に記載した態様で本発明を実施する場合に、好ましくは、請求項3に記載した様に、上記第一の据え込み工程で、上記第一中間素材の軸方向一端面中央部に凹部を形成する。又、上記剪断・押し出し工程で使用する1対のパンチのうち、上記第一中間素材の軸方向一端面を押圧する一方のパンチとして、先端面中央部に押圧面側凹部を設けたものを使用する。そして、上記剪断・押し出し工程で、上記第一中間素材の径方向外寄り部分を他方のパンチの外周面とダイスの内周面との間の円筒状空間に押し出して、円筒部を形成する。又、上記第一中間素材の軸方向一端部径方向中央寄り部分を上記押圧面側凹部に向け、1対の外輪軌道を形成すべき部分から軸方向一端側に離れる方向に変形させる。
When carrying out the above-described method for manufacturing a bearing ring member of the present invention, preferably, as described in claim 2, any one of the inner and outer peripheral surfaces of the bearing ring member is set to be an inner surface. A circumferential surface is provided, and two rows of outer ring raceways are provided at two axial positions on the inner circumferential surface.
When carrying out the present invention in such an aspect described in claim 2, preferably, as described in claim 3, in the first upsetting step, one end surface in the axial direction of the first intermediate material. A recess is formed at the center. Of the pair of punches used in the shearing / extruding process, one punch that presses one end surface in the axial direction of the first intermediate material has a pressing surface side recess at the center of the tip surface. To do. Then, in the shearing / extruding step, the radially outer portion of the first intermediate material is extruded into a cylindrical space between the outer peripheral surface of the other punch and the inner peripheral surface of the die to form a cylindrical portion. In addition, the first intermediate material is deformed in a direction away from the portion where the pair of outer ring raceways should be formed in the axial direction, with the axially central portion of the first intermediate material facing the concave portion on the pressing surface side.

又、上述の様な請求項2に記載した態様で、本発明を実施する場合に、好ましくは、請求項4に記載した様に、上記第二中間素材を塑性変形させて外向フランジを形成する第二の据え込み工程の際に、この第二中間素材に設けた円筒部の内周面に存在する、1対の外輪軌道となるべき部分に、金属材料を移動させない。
或いは、請求項5に記載した様に、上記第二の据え込み加工で、軸方向一端面中央部に、円筒部の内径側に存在する凹孔と同心の第二の凹孔を形成し、その後、これら凹孔と第二の凹孔との間に存在する隔壁部を打ち抜き除去する。
Further, when the present invention is carried out in the aspect described in claim 2 as described above, preferably, as described in claim 4, the second intermediate material is plastically deformed to form an outward flange. In the second upsetting step, the metal material is not moved to a portion that is to be a pair of outer ring raceways that exists on the inner peripheral surface of the cylindrical portion provided in the second intermediate material.
Alternatively, as described in claim 5, in the second upsetting process, a second concave hole concentric with the concave hole existing on the inner diameter side of the cylindrical portion is formed in the central portion of the one axial end surface, Thereafter, the partition wall existing between the concave hole and the second concave hole is punched and removed.

上述の様に構成する本発明の軌道輪部材の製造方法によれば、周面のうちの軸方向に離隔した2個所位置に形成した両軌道のうち、少なくとも転動体荷重が作用する部分に、素材のうちで清浄度の高い中間円筒状部分の金属材料を露出させられる。この為、上記両軌道の転がり疲れ寿命を確保し、これら両軌道を備えた軌道輪部材を含む車輪支持用転がり軸受ユニットの耐久性確保の為の設計の自由度向上を図れる。   According to the method of manufacturing the race ring member of the present invention configured as described above, at least a portion where the rolling element load acts on both raceways formed at two positions separated in the axial direction of the peripheral surface, The metal material of the intermediate cylindrical portion having a high cleanliness among the materials can be exposed. For this reason, the rolling fatigue life of the both raceways can be ensured, and the degree of freedom in design for securing the durability of the wheel bearing rolling bearing unit including the raceway ring member having both raceways can be improved.

特に、請求項2〜4に記載した発明の軌道輪部材の製造方法によれば、外輪或いはハブである軌道輪部材の内周面のうちの軸方向に離隔した2個所位置に形成した1対の外輪軌道のうちの、少なくとも転動体荷重が加わる部分に、上記中間円筒状部分の金属材料を効果的に露出させられる。
又、請求項5に記載した発明の軌道輪部材の製造方法によれば、無駄な金属材料を除去して、軽量な車輪支持用転がり軸受ユニットを得られる。
In particular, according to the bearing ring member manufacturing method of the invention described in claims 2 to 4, a pair formed at two axially spaced positions on the inner peripheral surface of the bearing ring member that is an outer ring or a hub. The metal material of the intermediate cylindrical portion can be effectively exposed to at least a portion to which the rolling element load is applied in the outer ring raceway.
In addition, according to the method of manufacturing the bearing ring member according to the fifth aspect of the present invention, it is possible to obtain a lightweight wheel support rolling bearing unit by removing useless metal material.

図1〜5は、総ての請求項に対応する、本発明の実施の形態の1例を示している。本例の製造方法は、図1の(A)に示した、中炭素鋼、軸受鋼、浸炭鋼の如き鉄系合金等の、塑性加工後に焼き入れ硬化可能な、金属製で円柱状の素材16に、順次、塑性加工或いは打ち抜き加工を施す。そして、(B)に示した第一中間素材17、(C)に示した第二中間素材18、(D)に示した第三中間素材19を経て、(E)に示した第四中間素材20を得る。更に、この第四中間素材20に、必要とする切削加工及び研削加工を施して、前述の図7に示した様な、外輪回転型の車輪支持用転がり軸受ユニット1aを構成するハブ10とする。以下、上記素材16を上記第四中間素材20に加工する工程に就いて、順番に説明する。尚、以下の加工は、基本的には総て熱間若しくは温間で行なうが、小型のハブを形成する場合等、可能であれば、冷間で行なっても良い。   1 to 5 show an example of an embodiment of the present invention corresponding to all claims. The manufacturing method of this example is a metal cylindrical material that can be quenched and hardened after plastic working, such as an iron-based alloy such as medium carbon steel, bearing steel, and carburized steel, as shown in FIG. 16 is sequentially subjected to plastic working or punching. Then, the first intermediate material 17 shown in (B), the second intermediate material 18 shown in (C), the third intermediate material 19 shown in (D), and the fourth intermediate material shown in (E). Get 20. Further, the fourth intermediate material 20 is subjected to necessary cutting and grinding to form a hub 10 constituting the outer ring rotating type wheel support rolling bearing unit 1a as shown in FIG. . Hereinafter, the process of processing the material 16 into the fourth intermediate material 20 will be described in order. The following processing is basically performed either hot or warm, but may be performed cold if possible, such as when a small hub is formed.

先ず、第一の据え込み工程で、図1の(A)→(B)に示す様に、上記素材16を軸方向に押し潰しつつ外径を拡げ、この素材16を上記第一中間素材17とする。本例の場合には、この様な第一の据え込み工程の際に、この第一中間素材17の軸方向一端面{図1の(B)の上端面、軸方向外端面}中央部に凹部21を、軸方向他端面{図1の(B)の下端面、軸方向内端面}外径寄り部分に円環状の突条22を、それぞれ形成する。この為に、上記素材16を軸方向両側から押し潰す為の1対の金型のうち、一方(上方)の金型としてその押圧面(下面)に上記凹部21に見合う突部を設けたものを、他方(下方)の金型としてその押圧面(上面)に上記突条22に見合う凹溝を設けたものを、それぞれ使用する。この様な第一の据え込み工程で、上記素材16を上記第一中間素材17に塑性加工する事に伴い、中央寄り円柱状部分の金属材料12と、中間円筒状部分の金属材料13と、外径寄り円筒状部分の金属材料14との分布状況が、図4の(A)→(B)に示す様に変化する。   First, in the first upsetting process, as shown in FIGS. 1A to 1B, the outer diameter is expanded while the material 16 is crushed in the axial direction, and the material 16 is expanded to the first intermediate material 17. And In the case of this example, at the time of such a first upsetting process, the first intermediate material 17 has an axial one end surface {the upper end surface in FIG. An annular ridge 22 is formed on each of the recesses 21 on the other end surface in the axial direction {the lower end surface of FIG. 1B, the inner end surface in the axial direction} on the outer diameter side. For this purpose, one of the pair of molds for crushing the material 16 from both sides in the axial direction is provided with a protrusion corresponding to the recess 21 on the pressing surface (lower surface) as one (upper) mold. Are used as the other mold (downward), and the pressing surface (upper surface) is provided with a concave groove corresponding to the protrusion 22. In such a first upsetting process, as the raw material 16 is plastically processed into the first intermediate raw material 17, the metal material 12 in the central cylindrical portion, the metallic material 13 in the intermediate cylindrical portion, The distribution status of the cylindrical portion closer to the outer diameter with the metal material 14 changes as shown in FIGS.

次の剪断・押し出し工程で、図1の(B)→(C)に示す様に、上記第一中間素材17を前記第二中間素材18に塑性加工する。この様な剪断・押し出し工程では、図2に示す様に、ダイス23により周囲を囲まれる空間内で上記第一中間素材17を、特許請求の範囲の1対のパンチである、押圧パンチ24とカウンターパンチ25とにより軸方向に押圧する。上記ダイス23に形成した成形孔26の内周面は、上半部を、軸方向に関して内径が変化しない円筒面部27とし、下半部を、下方に向かうに従って内径が漸次小さくなる複合曲面部28としている。この複合曲面部28は、上記第二中間素材18及び前記第三中間素材19の軸方向内半部の外周面の形状に見合う(凹凸反転した)形状としている。図示の例では、上記複合曲面部28の軸方向外端部の直径を、軸方向外方に向かう程急激に大きくして、上記円筒面部27と連続させている。   In the next shearing / extrusion step, the first intermediate material 17 is plastically processed into the second intermediate material 18 as shown in FIGS. In such a shearing / extruding process, as shown in FIG. 2, the first intermediate material 17 is placed in a space surrounded by a die 23 with a pressing punch 24, which is a pair of punches in the claims. It is pressed in the axial direction by the counter punch 25. The inner peripheral surface of the forming hole 26 formed in the die 23 has an upper half portion as a cylindrical surface portion 27 whose inner diameter does not change in the axial direction, and a lower half portion as a compound curved surface portion 28 whose inner diameter gradually decreases as it goes downward. It is said. The composite curved surface portion 28 has a shape commensurate with the shape of the outer peripheral surface of the inner half portion in the axial direction of the second intermediate material 18 and the third intermediate material 19 (inverted irregularities). In the example shown in the drawing, the diameter of the outer end portion in the axial direction of the composite curved surface portion 28 is increased rapidly toward the outer side in the axial direction, and is continuous with the cylindrical surface portion 27.

又、上記両パンチ24、25のうち、押圧パンチ24の外周面は、上記成形孔26の円筒面部27に、金属材料が侵入する程の隙間なく嵌合する、円筒面としている。又、上記押圧パンチ24の先端面(下端面)は、中央部に押圧側凹孔29を形成し、この押圧側凹孔29の周囲を環状押圧部30により囲んでいる。この環状押圧部30の内周面側の断面形状は、ほぼ四分の一の円弧状である。尚、上記剪断・押し出し工程を実施する際には、上記押圧パンチ24は前記ダイス23に対し、プレス加工機のラムにより下降させる。   Of the punches 24 and 25, the outer peripheral surface of the pressing punch 24 is a cylindrical surface that fits into the cylindrical surface portion 27 of the molding hole 26 without a gap to allow the metal material to enter. The front end surface (lower end surface) of the pressing punch 24 is formed with a pressing side concave hole 29 at the center, and the periphery of the pressing side concave hole 29 is surrounded by an annular pressing portion 30. The cross-sectional shape of the annular pressing portion 30 on the inner peripheral surface side is substantially a quarter arc shape. When the shearing / extruding step is performed, the pressing punch 24 is lowered with respect to the die 23 by a ram of a press machine.

更に、上記カウンターパンチ25は、上記成形孔26の複合曲面部28の内径よりも小さな外径を有する。又、このカウンターパンチ25の外周面でこの複合曲面部28と対向する部分の形状は、上記第二中間素材18及び前記第三中間素材19の軸方向内半部の内周面の形状に見合う(凹凸反転した)形状としている。即ち、上記カウンターパンチ25の外周面の軸方向中間部には、軸方向内側の外輪軌道5(図3の鎖線参照)となるべき凹曲面部を形成する為の、凸曲面状段部31を形成している。   Further, the counter punch 25 has an outer diameter smaller than the inner diameter of the composite curved surface portion 28 of the molding hole 26. The shape of the portion of the outer peripheral surface of the counter punch 25 that faces the composite curved surface portion 28 matches the shape of the inner peripheral surface of the second intermediate material 18 and the third intermediate material 19 in the axially inner half. It has a shape (inverted unevenness). That is, a convex curved step portion 31 for forming a concave curved surface portion to be the outer ring raceway 5 (refer to a chain line in FIG. 3) on the inner side in the axial direction is provided at the axial intermediate portion of the outer peripheral surface of the counter punch 25. Forming.

この様なカウンターパンチ25は、上記成形孔26の内側に固定された状態で、上記剪断・押し出し工程を実施する際にも動く事はない。但し、上記カウンターパンチ25の外周面と上記成形孔26の内周面との間には、円筒状の押し出しパンチ32を昇降可能に設けている。この押し出しパンチ32は、上記剪断・押し出し工程の進行時には図2に示した位置に留まり、金属材料により押圧されても動く(下方に変位する)事はない。これに対して、上記剪断・押し出し工程による上記第二中間素材18の成形を完了し、上記押圧パンチ24が上昇した後には上昇し、この第二中間素材18を上記カウンターパンチ25の外周面と上記成形孔26の内周面との間から上方に押し出す(排出する)。   Such a counter punch 25 is fixed to the inside of the molding hole 26 and does not move even when the shearing / extruding step is performed. However, a cylindrical extrusion punch 32 is provided between the outer peripheral surface of the counter punch 25 and the inner peripheral surface of the molding hole 26 so as to be movable up and down. The extrusion punch 32 stays at the position shown in FIG. 2 when the shearing / extruding process proceeds, and does not move (displace downward) even when pressed by a metal material. On the other hand, after the molding of the second intermediate material 18 by the shearing / extruding process is completed and the pressing punch 24 is lifted, the second intermediate material 18 is lifted to the outer peripheral surface of the counter punch 25. It pushes upward (discharges) from between the inner peripheral surface of the molding hole 26.

それぞれが上述の様な形状を有する、ダイス23と押圧パンチ24とカウンターパンチ25とから成る、剪断・押し出し装置を使用して、前記第一中間素材17を上記第二中間素材18に加工するには、先ず、図2の左半部に示す様に、この第一中間素材17を上記ダイス23内にセットする。次いで、プレス加工機のラムにより上記押圧パンチ24を、下方に押圧し、この押圧パンチ24の先端面で上記第一中間素材17を、上記カウンターパンチ25に向けて強く押圧する。   The first intermediate material 17 is processed into the second intermediate material 18 by using a shearing / extruding device, each of which has a shape as described above, and which comprises a die 23, a press punch 24, and a counter punch 25. First, as shown in the left half of FIG. 2, the first intermediate material 17 is set in the die 23. Next, the pressing punch 24 is pressed downward by the ram of the press machine, and the first intermediate material 17 is strongly pressed toward the counter punch 25 by the front end surface of the pressing punch 24.

このカウンターパンチ25と上記押圧パンチ24とにより軸方向両側から強く挟持された、上記第一中間素材17のうち、外径寄り部分は前記環状押圧部30により下方に押圧されて、図2の矢印α1 →α2 に示す様に、上記成形孔26の複合曲面部28と上記カウンターパンチ25の外周面との間の円筒状キャビティ33内に押し込まれ、特許請求の範囲に記載した円筒部である、主円筒部36を構成する。この主円筒部36の内側の空間が、特許請求の範囲に記載した凹孔(37)である。これに対して、上記第一中間素材17の径方向中央寄り部分は、上記押圧パンチ24の下降の反作用として、上記カウンターパンチ25の先端面(上端面)により、この押圧パンチ24の先端面中央部に設けた押圧側凹孔29内に、図2の矢印β1 →β2 に示す様に押し込まれる。 A portion closer to the outer diameter of the first intermediate material 17 firmly held from both sides in the axial direction by the counter punch 25 and the pressing punch 24 is pressed downward by the annular pressing portion 30, and the arrow in FIG. As indicated by α 1 → α 2 , the cylindrical portion 33 is pushed into the cylindrical cavity 33 between the composite curved surface portion 28 of the molding hole 26 and the outer peripheral surface of the counter punch 25, A certain main cylindrical portion 36 is formed. A space inside the main cylindrical portion 36 is a concave hole (37) described in the claims. On the other hand, a portion closer to the center in the radial direction of the first intermediate material 17 is caused by the tip surface (upper end surface) of the counter punch 25 as a reaction of the lowering of the press punch 24 and the center of the tip surface of the press punch 24 It is pushed into the pressing side concave hole 29 provided in the section as shown by arrows β 1 → β 2 in FIG.

要するに、上記第一中間素材17のうちで径方向中央部と径方向外寄り部分とを、上記カウンターパンチ25と上記押圧パンチ24とにより軸方向両側から強く挟持する事で、上記第一中間素材17に剪断力を発生させる。そして、この第一中間素材17のうちの外径寄り部分の金属材料を上記円筒状キャビティ33内に押し出し、径方向中央寄り部分の金属材料を上記押圧側凹孔29内に押し込む。この様な剪断・押し出し工程で、上記第一中間素材17を上記第二中間素材18に塑性加工する事に伴い、中央寄り円柱状部分の金属材料12と、中間円筒状部分の金属材料13と、外径寄り円筒状部分の金属材料14との分布状況が、図4の(B)→(C)に示す様に変化する。   In short, the first intermediate material 17 is strongly clamped from both sides in the axial direction by the counter punch 25 and the pressing punch 24 in the radially intermediate portion of the first intermediate material 17. 17 generates a shearing force. Then, the metal material near the outer diameter of the first intermediate material 17 is extruded into the cylindrical cavity 33, and the metal material near the center in the radial direction is pushed into the pressing-side concave hole 29. In such a shearing / extrusion process, the first intermediate material 17 is plastically processed into the second intermediate material 18, and as a result, the metal material 12 in the central cylindrical portion, the metal material 13 in the intermediate cylindrical portion, The distribution state of the cylindrical portion closer to the outer diameter with the metal material 14 changes as shown in FIGS. 4B to 4C.

次の第二の据え込み工程で、図1の(C)→(D)に示す様に、上記第二中間素材18を前記第三中間素材19に塑性加工する。この様な第二の据え込み工程では、鍛造加工の分野で広く知られている方法により、この第二中間素材18の軸方向外端寄り部分を軸方向に圧縮して、金属材料を径方向外方に移動させる。そして、外周面に、特許請求の範囲に記載した外向フランジである支持フランジ7aを形成した、上記第三中間素材19とする。この様な支持フランジ7aを形成する為の第二の据え込み加工を行なうには、先ず、上記第二中間素材18を分割式の受型内にセットする。この受型の内面形状は、造るべき上記第三中間素材19のうち、軸方向外端部に形成すべきパイロット部34(図3の鎖線参照)を形成すべき円筒部35の内面部分の形状に一致している。   In the next second upsetting step, the second intermediate material 18 is plastically processed into the third intermediate material 19 as shown in FIG. In such a second upsetting process, the portion near the outer end in the axial direction of the second intermediate material 18 is compressed in the axial direction by a method widely known in the field of forging, so that the metal material is compressed in the radial direction. Move outward. And it is set as the said 3rd intermediate material 19 which formed in the outer peripheral surface the support flange 7a which is the outward flange described in the claim. In order to perform the second upsetting process for forming such a support flange 7a, first, the second intermediate material 18 is set in a split type receiving die. The shape of the inner surface of the receiving die is the shape of the inner surface portion of the cylindrical portion 35 where the pilot portion 34 (see the chain line in FIG. 3) to be formed in the axially outer end portion of the third intermediate material 19 to be manufactured. It matches.

特に、本例の場合には、上記第二中間素材18を上記第三中間素材19に加工する際に、この第二中間素材18に設けた主円筒部36の内周面に存在する、1対の外輪軌道5、5(図3の鎖線参照)となるべき部分に金属材料を移動させない。この為に、上記受型のうち、上記支持フランジ7aよりも軸方向内方に突出している、上記主円筒部36を保持する部分の内面形状は、この主円筒部36の外面との間に、金属材料の流動に結び付く様な隙間を介在させない形状としている。   In particular, in the case of this example, when the second intermediate material 18 is processed into the third intermediate material 19, there exists 1 on the inner peripheral surface of the main cylindrical portion 36 provided on the second intermediate material 18. The metal material is not moved to the portion to be the pair of outer ring raceways 5, 5 (see the chain line in FIG. 3). For this reason, the shape of the inner surface of the receiving mold that protrudes inward in the axial direction from the support flange 7 a and that holds the main cylindrical portion 36 is between the outer surface of the main cylindrical portion 36. In addition, a shape that does not interpose a gap that leads to the flow of the metal material is used.

一方、上記第二中間素材18の軸方向外端寄り部分を軸方向に圧縮する為のパンチは、この第二中間素材18の軸方向外端面の外径よりも小さな外径を有し、先端面外周縁部を断面円弧状の凸曲面としている。上記第二の据え込み工程では、この様なパンチを上記第二中間素材18の軸方向外端面中央部にを押し付けて、この中央部を軸方向に押し潰し、この部分の金属材料を径方向外方に移動させ、上記支持フランジ7aを形成する。上記パンチが押し込まれた部分が、第二の凹孔38となる。同時に、この第二の凹孔38の周囲に、上記円筒部35を形成する。この様な第二の据え込み工程で、上記第二中間素材18を上記第三中間素材19に塑性加工する事に伴い、中央寄り円柱状部分の金属材料12と、中間円筒状部分の金属材料13と、外径寄り円筒状部分の金属材料14との分布状況が、図4の(C)→(D)に示す様に変化する。   On the other hand, the punch for compressing the portion near the outer end in the axial direction of the second intermediate material 18 in the axial direction has an outer diameter smaller than the outer diameter of the outer end surface in the axial direction of the second intermediate material 18. The outer peripheral edge is a convex curved surface having an arc cross section. In the second upsetting step, such a punch is pressed against the central portion of the second intermediate material 18 in the axial direction outer end surface, the central portion is crushed in the axial direction, and the metal material in this portion is radiated in the radial direction. The support flange 7a is formed by moving outward. The portion into which the punch is pressed becomes the second concave hole 38. At the same time, the cylindrical portion 35 is formed around the second concave hole 38. In such a second upsetting process, as the second intermediate material 18 is plastically processed into the third intermediate material 19, the metal material 12 in the central cylindrical portion and the metal material in the intermediate cylindrical portion 13 and the distribution of the metal material 14 in the cylindrical portion closer to the outer diameter change as shown in (C) → (D) of FIG.

そして、最後に、図1の(D)→(E)に示す様に、前記凹孔37と上記第二の凹孔38との間に存在する隔壁部39を、プレス加工等により打ち抜き除去し、前記第四中間素材20とする。この第四中間素材20は、完成後のハブ10(図3の鎖線参照)よりも厚肉である。そこで、この第四中間素材20に、所定の切削(旋削)加工及び研削加工を施して、上記ハブ10として完成する。図5に、上記第三中間素材19の段階での、上記各金属材料12〜14の分布状態と、完成後のハブ10の断面形状とを示している。この様な図5から明らかな通り、本例のハブ10の製造方法によれば、このハブ10の内周面のうちの軸方向に離隔した2個所位置に形成した両外輪軌道5、5のうち、少なくとも転動体荷重が作用する部分に、素材のうちで清浄度の高い中間円筒状部分の金属材料13を露出させられる。この為、上記両外輪軌道5、5の転がり疲れ寿命を確保し、これら両外輪軌道5、5を備えたハブ10を含む車輪支持用転がり軸受ユニットの耐久性確保の為の設計の自由度向上を図れる。   Finally, as shown in FIG. 1 (D) → (E), the partition wall 39 existing between the concave hole 37 and the second concave hole 38 is punched and removed by pressing or the like. , The fourth intermediate material 20. The fourth intermediate material 20 is thicker than the completed hub 10 (see the chain line in FIG. 3). Therefore, the hub 10 is completed by subjecting the fourth intermediate material 20 to predetermined cutting (turning) processing and grinding. FIG. 5 shows a distribution state of the metal materials 12 to 14 and a cross-sectional shape of the hub 10 after completion at the stage of the third intermediate material 19. As apparent from FIG. 5, according to the manufacturing method of the hub 10 of this example, the outer ring raceways 5, 5 formed at two positions separated in the axial direction on the inner peripheral surface of the hub 10. Among them, the metal material 13 of the intermediate cylindrical portion having a high cleanliness among the raw materials can be exposed to at least a portion where the rolling element load acts. For this reason, the rolling fatigue life of the outer ring raceways 5 and 5 is ensured, and the degree of freedom in design for ensuring the durability of the wheel bearing rolling bearing unit including the hub 10 provided with the outer ring raceways 5 and 5 is improved. Can be planned.

上述の説明は、本発明の軌道輪部材の製造方法により、前述の図7に示した様な、外輪回転型の車輪支持用転がり軸受ユニット1aを構成するハブ10を造る場合を中心に説明した。但し、本発明の軌道輪部材の製造方法は、前述の図6に示した様な、内輪回転型の車輪支持用転がり軸受ユニット1を構成する外輪2を造る場合に利用する事もできる。更には、前述の図8に示した様な、駆動輪用で内輪回転型の車輪支持用転がり軸受ユニット1bを構成するハブ本体11を造る場合に利用する事もできる。   The above description has been focused on the case where the hub 10 constituting the outer ring rotating type wheel support rolling bearing unit 1a as shown in FIG. 7 described above is manufactured by the method of manufacturing the bearing ring member of the present invention. . However, the method of manufacturing the race ring member of the present invention can also be used when the outer ring 2 constituting the inner ring rotating type wheel bearing rolling bearing unit 1 as shown in FIG. 6 is manufactured. Furthermore, it can also be used in the case where the hub main body 11 constituting the wheel support rolling bearing unit 1b for the driving wheel and of the inner ring rotation type as shown in FIG. 8 is used.

本発明の軌道輪部材の製造方法の実施の形態の1例を工程順に示す、素材乃至第四中間素材の断面図。Sectional drawing of the raw material thru | or 4th intermediate material which shows one example of embodiment of the manufacturing method of the bearing ring member of this invention in process order. 剪断・押し出し加工の実施状況を、左半部の加工前の状態と右半部の加工後の状態とで示す断面図。Sectional drawing which shows the implementation condition of a shearing / extrusion process in the state before a process of a left half part, and the state after a process of a right half part. 第四中間素材の断面形状と完成後のハブの断面形状との関係を示す図。The figure which shows the relationship between the cross-sectional shape of a 4th intermediate material, and the cross-sectional shape of the hub after completion. 素材から中間素材への加工進行に伴って、中央寄り円柱状部分の金属材料と、中間円筒状部分の金属材料と、外径寄り円筒状部分の金属材料との分布状況が変化する状況を示す断面図。Shows the situation where the distribution of the metal material near the center, the metal material near the intermediate cylindrical portion, and the metal material near the outer diameter changes as the processing from the material to the intermediate material progresses Sectional drawing. 第三中間素材の段階での、中央寄り円柱状部分の金属材料と、中間円筒状部分の金属材料と、外径寄り円筒状部分の金属材料との分布状況を示す断面図。Sectional drawing which shows the distribution condition of the metal material of the cylindrical part near the center, the metal material of the intermediate cylindrical part, and the metal material of the cylindrical part near the outer diameter at the stage of the third intermediate material. 本発明の製造方法の対象となる軌道輪部材である外輪を備えた、内輪回転型の車輪支持用転がり軸受ユニットの1例を示す断面図。Sectional drawing which shows an example of the rolling bearing unit for wheel support of an inner ring | wheel rotation type provided with the outer ring | wheel which is the bearing ring member used as the object of the manufacturing method of this invention. 本発明の製造方法の対象となる軌道輪部材であるハブを備えた、外輪回転型の車輪支持用転がり軸受ユニットの1例を示す断面図。Sectional drawing which shows an example of the rolling bearing unit for wheel support of an outer ring | wheel rotation type provided with the hub which is the bearing ring member used as the object of the manufacturing method of this invention. 本発明の製造方法の対象となる軌道輪部材であるハブ本体を備えた、内輪回転型で駆動輪用の車輪支持用転がり軸受ユニットの1例を示す断面図。Sectional drawing which shows an example of the wheel bearing rolling bearing unit for an inner ring | wheel rotation type and drive wheels provided with the hub main body which is the bearing ring member used as the object of the manufacturing method of this invention. 従来から知られている軌道輪部材の製造方法の2例を、それぞれ工程順に示す断面図。Sectional drawing which shows two examples of the manufacturing method of the ring member conventionally known conventionally in order of a process. 従来の製造方法により第三中間素材を造った状態での、中央寄り円柱状部分の金属材料と、中間円筒状部分の金属材料と、外径寄り円筒状部分の金属材料との分布状況を示す断面図。Shows the distribution of the metal material near the center, the metal material near the middle cylindrical part, and the metal material near the outer diameter cylindrical part in the state where the third intermediate material is made by the conventional manufacturing method Sectional drawing.

符号の説明Explanation of symbols

1、1a、1b 車輪支持用転がり軸受ユニット
2、2a 外輪
3、3a ハブ
4 転動体
5 外輪軌道
6 取付部
7、7a 支持フランジ
8 内輪軌道
9、9a 内輪
10 ハブ
11 ハブ本体
12 中央寄り円柱部分の金属材料
13 中間円筒状部分の金属材料
14 外径寄り円筒状部分の金属材料
15 中間素材
16 素材
17 第一中間素材
18 第二中間素材
19 第三中間素材
20 第四中間素材
21 凹部
22 突条
23 ダイス
24 押圧パンチ
25 カウンターパンチ
26 成形孔
27 円筒面部
28 複合曲面部
29 押圧側凹孔
30 環状押圧部
31 凸曲面状段部
32 押し出しパンチ
33 円筒状キャビティ
34 パイロット部
35 円筒部
36 主円筒部
37 凹孔
38 第二の凹孔
39 隔壁部
DESCRIPTION OF SYMBOLS 1, 1a, 1b Rolling bearing unit for wheel support 2, 2a Outer ring 3, 3a Hub 4 Rolling element 5 Outer ring raceway 6 Mounting part 7, 7a Support flange 8 Inner ring raceway 9, 9a Inner ring 10 Hub 11 Hub main body 12 Centering cylindrical part 13 Metal material of intermediate cylindrical portion 14 Metal material of cylindrical portion closer to outer diameter 15 Intermediate material 16 Material 17 First intermediate material 18 Second intermediate material 19 Third intermediate material 20 Fourth intermediate material 21 Recess 22 Projection Article 23 Die 24 Press punch 25 Counter punch 26 Molding hole 27 Cylindrical surface portion 28 Compound curved surface portion 29 Press side concave hole 30 Annular pressing portion 31 Convex surface stepped portion 32 Extrusion punch 33 Cylindrical cavity 34 Pilot portion 35 Cylindrical portion 36 Main cylinder Part 37 concave hole 38 second concave hole 39 partition wall part

Claims (5)

円柱状の素材を塑性変形させる事により、内外両周面のうちの何れかの周面の軸方向2個所位置に複列の軌道を、外周面のうちでこれら両軌道同士の間の中央位置よりも軸方向一端寄り部分に外向フランジを、それぞれ備えた軌道輪部材とする、軌道輪部材の製造方法に於いて、上記素材を軸方向に押し潰して第一中間素材とする第一の据え込み工程と、この第一中間素材をダイスにより周囲を囲まれる空間内で1対のパンチにより軸方向に押圧する事で、軸方向他端面に開口する断面円形の凹孔を有し、この凹孔の周囲を円筒部とした第二中間素材とする剪断・押し出し工程と、この第二中間素材の軸方向一端寄り部分を軸方向に圧縮して金属材料を径方向外方に移動させ、上記外向フランジを形成する第二の据え込み工程とを備える事を特徴とする軌道輪部材の製造方法。   By plastically deforming the cylindrical material, a double row track is positioned at two positions in the axial direction of either of the inner and outer peripheral surfaces, and a central position between these two tracks on the outer peripheral surface. In the method of manufacturing a bearing ring member, which is provided with an outward flange at a portion closer to one end in the axial direction than the first, the first material is crushed in the axial direction to form the first intermediate material. And the first intermediate material is pressed in the axial direction by a pair of punches in a space surrounded by a die, thereby having a concave hole with a circular cross section that opens at the other end surface in the axial direction. A shearing / extrusion step to form a second intermediate material with a cylindrical portion around the hole, and a portion close to one end in the axial direction of the second intermediate material is compressed in the axial direction to move the metal material radially outward, With a second upsetting process to form an outward flange Method of manufacturing a bearing ring member to symptoms. 軌道輪部材の内外両周面のうちの何れかの周面が内周面であり、この内周面の軸方向2個所位置に複列の外輪軌道を設ける、請求項1に記載した軌道輪部材の製造方法。   The track ring according to claim 1, wherein any one of the inner and outer peripheral surfaces of the track ring member is an inner peripheral surface, and double rows of outer ring tracks are provided at two positions in the axial direction of the inner peripheral surface. Manufacturing method of member. 第一の据え込み工程で、第一中間素材の軸方向一端面中央部に凹部を形成すると共に、剪断・押し出し工程で使用する1対のパンチのうち、上記第一中間素材の軸方向一端面を押圧する一方のパンチとして、先端面中央部に押圧面側凹部を設けたものを使用する事により、上記剪断・押し出し工程で、上記第一中間素材の径方向外寄り部分を他方のパンチの外周面とダイスの内周面との間の円筒状空間に押し出して円筒部を形成すると共に、上記第一中間素材の軸方向一端部径方向中央寄り部分を上記押圧面側凹部に向け、1対の外輪軌道を形成すべき部分から軸方向一端側に離れる方向に変形させる、請求項2に記載した軌道輪部材の製造方法。   In the first upsetting step, a concave portion is formed in the central portion of the first intermediate material in the axial direction, and one end surface in the axial direction of the first intermediate material among the pair of punches used in the shearing / extrusion step. By using a punch with a pressing surface side concave portion at the center of the tip surface as one punch that presses, the radially outer portion of the first intermediate material is removed from the other punch by the shearing / extrusion step. A cylindrical portion is formed by extruding into a cylindrical space between the outer peripheral surface and the inner peripheral surface of the die, and the axially one end portion in the radial direction of the first intermediate material is directed toward the concave portion on the pressing surface side. The method for manufacturing a bearing ring member according to claim 2, wherein the pair of outer ring raceways are deformed in a direction away from one end side in the axial direction from a portion where the pair of outer ring raceways should be formed. 第二中間素材を塑性変形させて外向フランジを形成する第二の据え込み工程の際に、この第二中間素材に設けた円筒部の内周面に存在する、1対の外輪軌道となるべき部分に金属材料を移動させない、請求項2〜3のうちの何れか1項に記載した軌道輪部材の製造方法。   In the second upsetting process in which the second intermediate material is plastically deformed to form the outward flange, a pair of outer ring tracks existing on the inner peripheral surface of the cylindrical portion provided in the second intermediate material should be formed. The manufacturing method of the bearing ring member of any one of Claims 2-3 which does not move a metal material to a part. 第二の据え込み加工で、軸方向一端面中央部に、円筒部の内径側に存在する凹孔と同心の第二の凹孔を形成し、その後、これら凹孔と第二の凹孔との間に存在する隔壁部を打ち抜き除去する、請求項2〜4のうちの何れか1項に記載した軌道輪部材の製造方法。   In the second upsetting process, a second concave hole concentric with the concave hole existing on the inner diameter side of the cylindrical portion is formed in the central portion of the one axial end surface, and then the concave hole and the second concave hole are The manufacturing method of the bearing ring member according to any one of claims 2 to 4, wherein a partition wall existing between the two is punched and removed.
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Publication number Priority date Publication date Assignee Title
US7721386B2 (en) 2005-11-30 2010-05-25 Dorma Gmbh + Co. Kg Closer arm assembly for an automatic door closer
CN104972056A (en) * 2015-07-14 2015-10-14 泰州浙华机械精锻有限公司 Automobile hub flange closing die forging technology
CN106111877A (en) * 2016-08-19 2016-11-16 浙江中集铸锻有限公司 Wheel hub inner ring forging continuous mould
CN106166592A (en) * 2016-08-19 2016-11-30 浙江中集铸锻有限公司 Tapered roller bearing ring forging continuous mould
CN114406608A (en) * 2021-12-23 2022-04-29 江苏保捷精锻有限公司 Bearing ring grinding and expanding manufacturing process

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JP2006177466A (en) * 2004-12-22 2006-07-06 Sanyo Special Steel Co Ltd Outer ring of third generation hub bearing unit for supporting wheel of automobile and method of manufacturing the same
JP2006220195A (en) * 2005-02-09 2006-08-24 Nsk Ltd Bearing unit outside member
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JP2006250317A (en) * 2005-03-14 2006-09-21 Nsk Ltd Rolling bearing and bearing unit

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JP2005180627A (en) * 2003-12-22 2005-07-07 Nsk Ltd Raceway ring for bearing unit for supporting wheel, its manufacturing method, and bearing unit for supporting wheel
JP2006177466A (en) * 2004-12-22 2006-07-06 Sanyo Special Steel Co Ltd Outer ring of third generation hub bearing unit for supporting wheel of automobile and method of manufacturing the same
JP2006220195A (en) * 2005-02-09 2006-08-24 Nsk Ltd Bearing unit outside member
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JP2006250317A (en) * 2005-03-14 2006-09-21 Nsk Ltd Rolling bearing and bearing unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7721386B2 (en) 2005-11-30 2010-05-25 Dorma Gmbh + Co. Kg Closer arm assembly for an automatic door closer
CN104972056A (en) * 2015-07-14 2015-10-14 泰州浙华机械精锻有限公司 Automobile hub flange closing die forging technology
CN106111877A (en) * 2016-08-19 2016-11-16 浙江中集铸锻有限公司 Wheel hub inner ring forging continuous mould
CN106166592A (en) * 2016-08-19 2016-11-30 浙江中集铸锻有限公司 Tapered roller bearing ring forging continuous mould
CN114406608A (en) * 2021-12-23 2022-04-29 江苏保捷精锻有限公司 Bearing ring grinding and expanding manufacturing process

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