JP4225250B2 - Roller bearing roller manufacturing method and manufacturing apparatus - Google Patents

Roller bearing roller manufacturing method and manufacturing apparatus Download PDF

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JP4225250B2
JP4225250B2 JP2004214077A JP2004214077A JP4225250B2 JP 4225250 B2 JP4225250 B2 JP 4225250B2 JP 2004214077 A JP2004214077 A JP 2004214077A JP 2004214077 A JP2004214077 A JP 2004214077A JP 4225250 B2 JP4225250 B2 JP 4225250B2
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molds
roller
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axial direction
rolling surface
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JP2006035228A5 (en
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一登 小林
功 新藤
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/34—Rollers; Needles
    • F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/06—Ball or roller bearings
    • F16C23/08—Ball or roller bearings self-adjusting
    • F16C23/082—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface
    • F16C23/086—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface forming a track for rolling elements

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Forging (AREA)

Description

この発明は、円筒ころ軸受、円すいころ軸受、自動調心ころ軸受等のころ軸受を構成するころを塑性加工する為の製造方法及び製造装置の改良に関する。具体的には、面倒な段取り作業を必要とせずに、しかも素材に塑性加工を施して得られた中間素材の形状を完成品に近い形状にする事で、この中間素材に施す仕上加工による取代を少なくし、上記ころの加工コストの低減を図るものである。
本発明は、上記何れの型式のころ軸受のころも対象となるが、特に、転動面の母線形状が円弧状である、自動調心ころ軸受を構成する球面ころを造る場合に適用する事が有効である。 The present invention relates to an improvement in a manufacturing method and a manufacturing apparatus for plastic working a roller constituting a roller bearing such as a cylindrical roller bearing, a tapered roller bearing or a self-aligning roller bearing. Specifically, the intermediate material obtained by applying plastic processing to the material without the need for troublesome setup work is made close to the finished product, so that the machining allowance by finishing processing applied to this intermediate material is possible. The processing cost of the roller is reduced.
The present invention is applicable to the rollers of any of the above types of roller bearings. In particular, the present invention is applied to the case of producing a spherical roller constituting a self-aligning roller bearing in which the generatrix of the rolling surface is an arc. Is effective.

例えば重量の嵩む軸をハウジングの内側に回転自在に支承する為の軸受として自動調心ころ軸受が、例えば特許文献１〜３等多くの刊行物に記載されて従来から周知であり、又、実際に広く使用されている。このうちの特許文献１に記載された構造に就いて、図５により説明する。この特許文献１に記載された自動調心ころ軸受は、外輪１と内輪２との間に、複数の球面ころ３、３を転動自在に配列すると共に、保持器４、４によりこれら各球面ころ３、３の分離防止を図っている。上記外輪１の内周面には、単一の中心を有する球状凹面である外輪軌道５を形成している。又、内輪２の外周面には、それぞれの幅方向（図５の左右方向）にこの外輪軌道５と対向する、１対の内輪軌道６、６を形成している。又、上記複数の球面ころ３、３は、その最大径部が各球面ころ３、３の軸方向長さの中央部にある対称形で、上記外輪軌道５と上記１対の内輪軌道６、６との間に、２列に亙って転動自在に配列されている。   For example, self-aligning roller bearings, which are described in many publications such as Patent Documents 1 to 3, are well known as bearings for rotatably supporting a heavy shaft on the inside of a housing. Widely used. Of these, the structure described in Patent Document 1 will be described with reference to FIG. In the self-aligning roller bearing described in Patent Document 1, a plurality of spherical rollers 3 and 3 are arranged in a freely rolling manner between an outer ring 1 and an inner ring 2, and each spherical surface is provided by cages 4 and 4. The rollers 3 and 3 are prevented from being separated. An outer ring raceway 5 that is a spherical concave surface having a single center is formed on the inner peripheral surface of the outer ring 1. A pair of inner ring raceways 6 and 6 are formed on the outer peripheral surface of the inner ring 2 so as to face the outer ring raceway 5 in the respective width directions (left and right direction in FIG. 5). The plurality of spherical rollers 3 and 3 are symmetrical in that the maximum diameter portion is in the center of the axial length of each spherical roller 3 and 3, and the outer ring raceway 5 and the pair of inner ring raceways 6 and 6 are arranged so as to roll freely in two rows.

上記各球面ころ３、３の軸方向両端面には、それぞれ円形若しくは円環状の凹部７を形成し、上記保持器４、４に形成した舌片８の先端部とこの凹部７とを係合させる事で、上記各球面ころ３、３がこれら両保持器４、４のポケット９から、径方向外方に抜け出る事を防止している。又、これら両保持器４、４の大径側端縁部に設けた外向フランジ部１０、１０の外周縁を、それぞれ案内リング１１の内周面に摺接させる事で案内している。この案内リング１１は、前記２列に亙って設けられた複数の球面ころ３、３の間に、回転自在に設けられている。又、上記両保持器４、４の小径側端部に設けた内向フランジ部１２、１２の内周縁を、上記内輪２の端部外周面に摺接させる事で案内している。   A circular or annular recess 7 is formed on each axial end surface of each of the spherical rollers 3, 3, and the tip of the tongue piece 8 formed on the cages 4, 4 is engaged with this recess 7. This prevents the spherical rollers 3 and 3 from coming out of the pockets 9 of both the cages 4 and 4 radially outward. Further, the outer peripheral edges of the outward flange portions 10, 10 provided at the large-diameter end edges of both the cages 4, 4 are guided by being brought into sliding contact with the inner peripheral surface of the guide ring 11. The guide ring 11 is rotatably provided between the plurality of spherical rollers 3 and 3 provided in the two rows. Further, the inner peripheral edges of the inward flange portions 12, 12 provided at the small diameter side ends of the cages 4, 4 are guided by being brought into sliding contact with the outer peripheral surface of the end portion of the inner ring 2.

上述の様に構成する自動調心ころ軸受の場合には、上記外輪１と上記内輪２の中心軸とが一致している場合は勿論、不一致の場合であっても、上記各球面ころ３、３の転動面が上記外輪軌道５を倣いつつ転動する。そして、これら各球面ころ３、３の転動面とこの外輪軌道５及び上記両内輪軌道６、６との転がり接触部に、エッジロードに基づく過大な面圧が作用する事を防止する。   In the case of the self-aligning roller bearing configured as described above, each of the spherical rollers 3, not only when the outer ring 1 and the center axis of the inner ring 2 are coincident but also when they are not coincident, 3 rolls while following the outer ring raceway 5. Then, excessive surface pressure based on the edge load is prevented from acting on the rolling contact portions of the rolling surfaces of the spherical rollers 3 and 3 and the outer ring raceway 5 and the inner ring raceways 6 and 6.

上述の様に構成し作用する自動調心ころ軸受に組み込む、上記各球面ころ３、３を造る場合には、軸受鋼等の金属製で円柱状の素材に塑性加工を施す事により、凡その形状を有する中間素材とした後、この中間素材に、切削、研削等の仕上加工を施す。図６は、従来方法により、上記素材を上記中間素材とする為の塑性加工を施す状態を示している。互いに同心に配置された１対の金型１３ａ、１３ｂはそれぞれの対向面に、上記素材を上記球面ころ３に形成する為の形成用凹部１４ａ、１４ｂを設けている。これら両形成用凹部１４ａ、１４ｂの内面形状は、上記球面ころ３の端面形状及び外周面形状にほぼ一致する（仕上加工の取代分だけ大きい）形状としている。   When making the spherical rollers 3 and 3 to be incorporated in the self-aligning roller bearing constructed and operated as described above, by applying plastic working to a cylindrical material made of metal such as bearing steel, After forming the intermediate material having a shape, the intermediate material is subjected to finishing processing such as cutting and grinding. FIG. 6 shows a state in which plastic processing is performed to make the material into the intermediate material by a conventional method. A pair of molds 13a and 13b arranged concentrically with each other is provided with forming recesses 14a and 14b for forming the material on the spherical roller 3 on the opposing surfaces. The inner surface shapes of these forming recesses 14a and 14b are substantially the same as the end surface shape and outer peripheral surface shape of the spherical roller 3 (larger than the machining allowance for finishing).

上記球面ころ３を形成する際には、先ず、図６の（Ａ）に示す様に、上述の様な１対の金型１３ａ、１３ｂ同士の間に円柱状の素材１５をセットした後、同図の（Ｂ）に示す様にこれら両金型１３ａ、１３ｂ同士を近づけ合う。この結果、上記素材１５が上記両形成用凹部１４ａ、１４ｂの内面形状に倣う方向に塑性変形し、中間素材１６となる。そこで、上記両金型１３ａ、１３ｂ同士を離隔させて（金型を開いて）この中間素材１６を取り出し、この中間素材１６に、切削加工、研削加工等の、必要な仕上加工を施す。   When forming the spherical roller 3, first, as shown in FIG. 6A, after setting the cylindrical material 15 between the pair of molds 13a, 13b as described above, As shown in FIG. 5B, the molds 13a and 13b are brought close to each other. As a result, the material 15 is plastically deformed in a direction following the inner surface shape of the forming recesses 14 a and 14 b, thereby forming the intermediate material 16. Therefore, the intermediate dies 16 are taken out by separating the two dies 13a and 13b (opening the dies), and the intermediate material 16 is subjected to necessary finishing processing such as cutting and grinding.

ところが、上述した様な従来の製造方法の場合には、軸方向両端面の加工と外周面の加工とを同時に行なう為、細部の形状を所望通りにできない。具体的には、上記軸方向両端面に凹部７、７を形成すべく、上記素材１５を軸方向に圧縮すると同時に、この素材１５の直径を拡げる。この為、上記両金型１３ａ、１３ｂ同士を近づけ合うのに伴って、上記素材１５を構成する金属材料が、図６の（Ｂ）に矢印α、αで示す様に、径方向と軸方向とに傾斜した方向に流れる。この結果、上記素材１５を塑性変形させ切って上記中間素材１６とした状態で、この中間素材１６の両端面径方向中間部で上記両凹部７、７の周囲部分に、この中間素材１６の両端面外径寄り部分からこれら両凹部７、７の底面に向かう方向に傾斜した、摺鉢状の傾斜面部１７、１７が形成される。   However, in the case of the conventional manufacturing method as described above, the processing of the axial end faces and the processing of the outer peripheral surface are simultaneously performed, and thus the detailed shape cannot be achieved as desired. Specifically, the diameter of the material 15 is expanded simultaneously with the material 15 being compressed in the axial direction so as to form the recesses 7 and 7 on both end surfaces in the axial direction. For this reason, as the molds 13a and 13b are brought close to each other, the metal material constituting the material 15 is changed in the radial direction and the axial direction as indicated by arrows α and α in FIG. It flows in an inclined direction. As a result, in the state in which the material 15 is plastically deformed to form the intermediate material 16, both ends of the intermediate material 16 are disposed in the peripheral portions of the recesses 7 and 7 at the intermediate portions in the radial direction of both ends of the intermediate material 16. Inclined bowl-shaped inclined surface portions 17 and 17 are formed which are inclined in the direction from the portion near the outer surface diameter toward the bottom surfaces of both concave portions 7 and 7.

この様な傾斜面部１７、１７は、形状が不安定である為、そのまま残した場合には、保持器４の舌片８（図５参照）との係合が不確実になり、この保持器４のポケット９（図５参照）からの上記球面ころ３の脱落防止が不完全になる。又、極端な場合には、この球面ころ３の回転バランスが不良になり、高速回転時に振動を発生する原因となる可能性もある。従って、上記両傾斜面部１７、１７は、上記仕上加工により除去しなければならず、この仕上加工による取代が多くなる。上記両凹部７、７は、本来相手面と転がり接触も摺動もしない部分であり、あまり高度の寸法並びに形状精度を要求する部分ではなく、上記両傾斜面部１７、１７が形成されなければ、仕上加工を施す必要がない部分である。ところが、前述した従来の製造方法の場合には、上記両傾斜面部１７、１７が形成される結果、上記両凹部７、７の周縁部を含み、仕上加工で広範囲に切削加工を施す必要が生じて、この仕上加工が面倒になり、上記球面ころ３のコスト上昇の原因となる。   Since such inclined surface portions 17 and 17 are unstable in shape, if left as they are, the engagement with the tongue piece 8 (see FIG. 5) of the cage 4 becomes uncertain, and this cage This prevents the spherical roller 3 from falling out of the four pockets 9 (see FIG. 5). In an extreme case, the rotational balance of the spherical roller 3 becomes poor, which may cause vibration during high-speed rotation. Therefore, both the inclined surface portions 17 and 17 must be removed by the finishing process, and the machining allowance by the finishing process increases. The concave portions 7 and 7 are originally portions that do not roll and slide with the mating surface, and are not portions that require very high dimensional and shape accuracy, and if both the inclined surface portions 17 and 17 are not formed, This is a part that does not require finishing. However, in the case of the above-described conventional manufacturing method, as a result of the formation of the two inclined surface portions 17 and 17, it is necessary to perform a wide range of cutting work in the finishing process, including the peripheral portions of the both concave portions 7 and 7. As a result, this finishing process becomes troublesome and causes an increase in the cost of the spherical roller 3.

又、前述した従来の製造方法の場合には、図６の（Ａ）から明らかな通り、１対の金型１３ａ、１３ｂの形成用凹部１４ａ、１４ｂ同士の間に素材１５を掛け渡す様にセットする際に、これら両金型１３ａ、１３ｂの中心軸とこの素材１５の中心軸とが自動的に一致する事はない。従って、これら各部の中心軸を互いに一致させる作業が必要になり、上記素材１５を上記中間素材１６とする塑性加工の為の段取りも面倒になり、やはり上記球面ころ３のコスト上昇の原因となる。
球面ころの加工方法として従来から、例えば特許文献４に記載された方法が記載されている。但し、この特許文献４に記載された方法は、球面ころの転動面と面取り部とを滑らかに連続させる為の方法であって、上述した様な原因で生じる、球面ころのコスト上昇を抑える事はできない。 Further, in the case of the above-described conventional manufacturing method, as apparent from FIG. 6A, the material 15 is passed between the forming recesses 14a and 14b of the pair of molds 13a and 13b. At the time of setting, the central axes of the molds 13a and 13b do not automatically coincide with the central axis of the material 15. Accordingly, it is necessary to make the central axes of these parts coincide with each other, and the setup for plastic working using the material 15 as the intermediate material 16 becomes troublesome, which also causes an increase in cost of the spherical roller 3. .
Conventionally, for example, a method described in Patent Document 4 has been described as a method of processing a spherical roller. However, the method described in Patent Document 4 is a method for smoothly connecting the rolling surface and the chamfered portion of the spherical roller, and suppresses the cost increase of the spherical roller caused by the above-described causes. I can't do that.

特開平５−１５７１１６号公報JP-A-5-157116 特開平８−２８５７６号公報JP-A-8-28576 特開平８−２９６６５３号公報JP-A-8-296653 特開平９−７６０２９号公報JP-A-9-76029

本発明のころ軸受用ころの製造方法及び製造装置は、上述の様な事情に鑑みて、面倒な段取り作業を必要とせずに、しかも素材に塑性加工を施して得られた中間素材の形状を完成品に近い形状にする事で、この中間素材に施す仕上加工による取代を少なくし、上記ころの加工コストの低減を図るべく発明したものである。   In view of the circumstances as described above, the roller bearing roller manufacturing method and manufacturing apparatus according to the present invention do not require troublesome setup work, and further, the shape of the intermediate material obtained by subjecting the material to plastic working is obtained. The invention was invented in order to reduce the machining cost of the roller by reducing the machining allowance for finishing the intermediate material by making the shape close to the finished product.

本発明のころ軸受用ころの製造方法及び製造装置は、金属製で円柱状の素材を塑性変形させる事により、外周面に相手軌道面と転がり接触する転動面を、軸方向両端面に凹部を、それぞれ備えたころ軸受用ころとする為の方法及び装置である。
このうち、請求項１に記載したころ軸受用ころの製造方法は、凹部加工工程と転動面加工工程とを備える。
このうちの凹部加工工程では、軸方向に関して互いに遠近動する１対の金型に形成した各円孔部に上記素材の軸方向両端部を内嵌する事により、この素材の軸方向両端部の外径が拡がるのを阻止する。そして、この状態で、この素材の軸方向両端面に１対のパンチを、互いに近づき合う方向に押し付けて、これら軸方向両端面に上記両凹部を形成する。
又、上記転動面加工工程では、これら両凹部を形成した後、又は、これら両凹部を形成しつつ、互いに近づき合う上記両パンチにより上記素材を軸方向に圧縮してこの素材を構成する金属材料を径方向外方に流動させる。そして、この流動によりこの金属材料を、上記両金型の端部内周面に形成された、上記各円孔部と同心の転動面形成用凹部内に充填して、上記転動面となる部分を形成する。 The roller bearing roller manufacturing method and manufacturing apparatus according to the present invention includes a metal cylindrical member that is plastically deformed so that a rolling contact surface that is in rolling contact with the mating raceway surface is formed on the outer circumferential surface, and concave portions are formed on both axial end surfaces. Is a method and an apparatus for making each a roller bearing roller.
Among these, the method for manufacturing a roller bearing roller according to claim 1 includes a recess machining step and a rolling surface machining step.
Of these, in the recess processing step, both ends of the material in the axial direction are fitted into the respective circular hole portions formed in a pair of molds that move far and away relative to each other in the axial direction. Prevents the outer diameter from expanding. In this state, a pair of punches are pressed against both axial end surfaces of the material in a direction approaching each other, thereby forming both concave portions on both axial end surfaces.
Further, in the rolling surface machining step, the metal constituting the raw material is formed by compressing the raw material in the axial direction by the punches approaching each other after forming both the concave portions or forming both the concave portions. The material is allowed to flow radially outward. And by this flow, the metal material is filled into the rolling surface forming recesses concentric with the respective circular hole portions, which are formed on the inner peripheral surfaces of the end portions of the two dies, to become the rolling surfaces. Forming part.

又、請求項３に記載した、ころ軸受用ころの製造装置は、互いに同心に配置されて軸方向に関する相対変位を可能として支持された、それぞれが円筒状である１対の金型を備える。これら両金型は、互いに対向する側の端部内周面に上記転動面の形状及び寸法に見合う形状及び寸法を有する転動面形成用凹部を、この転動面形成用凹部よりも奥部にこの転動面形成用凹部と同心で上記素材の両端部をほぼ（挿入可能とする為の微小隙間を除き、実質的に）隙間なく内嵌自在な円孔部を、それぞれ形成したものである。又、上記両金型の円孔部に、それぞれの先端面に上記凹部を形成する為の凸部を有するパンチを、これら両金型の内側で軸方向の変位を可能として設置している。   According to a third aspect of the present invention, there is provided a roller bearing roller manufacturing apparatus including a pair of molds that are arranged concentrically and supported so as to be capable of relative displacement in the axial direction, each having a cylindrical shape. These two molds have a rolling surface forming concave portion having a shape and a size corresponding to the shape and size of the rolling surface on the inner peripheral surface of the end portion facing each other, and the back portion of the rolling surface forming concave portion. In addition, concentric with the rolling surface forming concave portion, both end portions of the material are formed (substantially except for a minute gap for enabling insertion), and a circular hole portion that can be fitted with no gap is formed. is there. Further, punches having convex portions for forming the concave portions on the respective front end surfaces are installed in the circular hole portions of the both molds so as to be axially displaceable inside both the molds.

上述の様に構成する本発明のころ軸受用ころの製造方法及び製造装置により、円柱状の素材を、完成品であるころの形状に近い形状を有する中間素材とする際には、先ず、１対の金型に形成した各円孔部に上記素材の軸方向両端部を内嵌する。この内嵌作業により、これら両金型の中心軸とこの素材の中心軸とが一致する。従って、この素材をこれら両金型に対し正規位置にセットする段取り作業が容易になる。   When a cylindrical material is used as an intermediate material having a shape close to the shape of a roller as a finished product by the method and apparatus for manufacturing a roller bearing roller according to the present invention configured as described above, first, 1 The axial ends of the material are fitted into the circular holes formed in the pair of molds. By this internal fitting operation, the central axes of these molds coincide with the central axis of this material. Accordingly, the setup work for setting the material at the normal position with respect to both the molds is facilitated.

又、この段取り作業に続いて行なう凹部加工工程では、上記素材の軸方向両端部の外径が拡がるのを阻止した状態で、これら軸方向両端面に１対のパンチを、互いに近づき合う方向に押し付ける。従って、これら軸方向両端面に凹部を形成する際には、上記素材の軸方向両端部に存在する金属材料が径方向外方に流動する事はない。この為、上記軸方向両端面には、上記両パンチの先端面に形成した凸部の形状に合致する凹部を形成する事ができる。転動面の加工は、これら両凹部を形成した後、又は、これら両凹部を形成しつつ、上記金属材料を径方向外方に流動させる事により行なう為、これら両凹部の形状が不定になる事はない。この結果、転動面加工工程を完了して得られる中間素材に施す仕上加工での取代を少なく抑えて、ころ軸受用ころの加工コストの低減を図れる。   Further, in the recess processing step to be performed subsequent to the setup operation, a pair of punches are provided on both end surfaces in the axial direction so as to approach each other in a state where the outer diameters of the both end portions in the axial direction of the material are prevented from expanding. Press. Therefore, when the concave portions are formed on both end surfaces in the axial direction, the metal material present at both end portions in the axial direction of the material does not flow radially outward. For this reason, it is possible to form concave portions that match the shape of the convex portions formed on the tip surfaces of the two punches on both axial end surfaces. Since the rolling surface is processed by forming the two concave portions or by flowing the metal material radially outward while forming the two concave portions, the shapes of the two concave portions become indefinite. There is nothing. As a result, the machining cost of the roller bearing roller can be reduced by reducing the machining allowance in the finishing process applied to the intermediate material obtained by completing the rolling surface machining process.

請求項１に記載したころ軸受用ころ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、素材を構成する金属材料が転動面形成用凹部内に充填された状態で、この素材の軸方向両端部が円孔部から押し出され切る（円孔部による拘束が解除される）様にする。
この様にすれば、転動面となる部分が形成された状態で、この転動面となる部分の端縁と軸方向両端面とを連続させられる。この為、これら転動面の端縁と軸方向両端面との連続部の取り代を少なく抑えて、ころ軸受用ころの加工コストの更なる低減化を図れる。 Preferably, when the roller bearing roller manufacturing method according to claim 1 is carried out, as described in claim 2, the metal material constituting the material is filled in the rolling surface forming recess. The both ends in the axial direction of this material are pushed out from the circular hole part (restraint by the circular hole part is released).
If it does in this way, the edge of the part used as a rolling surface and the axial direction both end surfaces can be made continuous in the state in which the part used as a rolling surface was formed. For this reason, the machining cost of the roller bearing roller can be further reduced by reducing the allowance for the continuous portion between the end edge of the rolling surface and both end surfaces in the axial direction.

又、請求項３に記載したころ軸受用ころの製造装置を実施する場合に好ましくは、請求項４に記載した様に、１対の金型をそれぞれ支持固定した１対のホルダを、互いに遠近動を可能とした１対の押圧ブロックに対し、上記両金型の軸方向の変位を可能として支持する。又、これら両押圧ブロックと上記両ホルダとの間に、これら両ホルダを互いに近づき合う方向に押圧する弾性材、例えば請求項６に記載した様にばねを設置する。この様な弾性材（ばね）の弾力は、ころ軸受用ころを造る為の素材を構成する金属材料が流動する力に対し、或る程度抵抗になる程に大きな値とする。例えば、請求項５に記載した様に、両パンチが互いに最も近づき合い、素材を構成する金属材料が転動面形成用凹部内に充填された状態で、これら両パンチの先端部外周縁と転動面形成用凹部の奥端部内周縁とが連続する様に、上記弾性材（ばね）の弾力を規制する。
この様に構成すれば、転動面加工工程で転動面形成用凹部内に充填された金属材料の外面を適切な力で抑え付けつつ、上記両金型同士の間隔が調整される。この為、適正な形状を有する中間素材を得られる。 Preferably, when carrying out the roller bearing roller manufacturing apparatus according to claim 3, a pair of holders each supporting and fixing a pair of molds are connected to each other as described in claim 4. The pair of pressing blocks that can be moved are supported so as to be capable of displacement in the axial direction of both molds. Further, an elastic material that presses both the holders in a direction approaching each other, for example, a spring as described in claim 6, is installed between the both pressing blocks and the both holders. The elasticity of such an elastic material (spring) is set to such a large value that it is somewhat resistant to the force of flow of the metal material constituting the material for making the roller bearing roller. For example, as described in claim 5, both punches come closest to each other, and the metal material constituting the raw material is filled in the rolling surface forming recess, and the outer peripheral edge of the tip of each of the punches rolls. The elasticity of the elastic material (spring) is regulated so that the inner edge of the inner end of the concave for forming the moving surface is continuous.
If comprised in this way, the space | interval of the said metal mold | die will be adjusted, hold | suppressing the outer surface of the metal material with which it filled in the recessed part for rolling surface formation by the rolling surface process process with appropriate force. For this reason, an intermediate material having an appropriate shape can be obtained.

図１〜２は、本発明の実施例１として、本発明を、自動調心ころ軸受用の球面ころを造る為に適用する場合を示している。先ず、図１に示した、本発明によるころ軸受用ころの製造装置の構造に就いて説明する。本発明のころ軸受用ころの製造装置も、前述した従来装置の場合と同様に、互いに同心に配置されて軸方向に関する相対変位を可能として支持された、それぞれが円筒状である１対の金型１８ａ、１８ｂを備える。これら両金型１８ａ、１８ｂはそれぞれ、互いに同心の転動面形成用凹部１９と円孔部２０とを備える。このうちの転動面形成用凹部１９は、上記両金型１８ａ、１８ｂの軸方向両端面のうち、互いに対向する側の端部内周面に形成されたもので、造るべき球面ころ３（図３参照）の転動面の形状及び寸法に見合う形状及び寸法を有する。即ち、上記転動面形成用凹部１９の内面寸法（内径及び軸方向寸法）は、上記球面ころ３の軸方向両端部の外面形状と類似（ほぼ一致）する形状で、この球面ころ３の軸方向両端部の外面寸法（外径及び軸方向寸法）よりも僅かに大きい。この僅かに大きい分は、仕上加工として行なう、切削加工又は研削加工の削り代分である。尚、上記両金型１８ａ、１８ｂの転動面形成用凹部１９の軸方向寸法Ｌ19の合計（２Ｌ19）は、本実施例により造られる中間素材１６ａ｛図１及び図２の（Ｄ）参照｝の軸方向寸法Ｌ16よりも小さい（２Ｌ19＜Ｌ16）。従って、上記両金型１８ａ、１８ｂの互いに対向する端面は、上記中間素材１６ａを加工する際に、最後まで突き合わされる事はない。 1 and 2 show a case where the present invention is applied to manufacture a spherical roller for a self-aligning roller bearing as a first embodiment of the present invention. First, the structure of the roller bearing roller manufacturing apparatus according to the present invention shown in FIG. 1 will be described. The roller bearing roller manufacturing apparatus of the present invention is also a pair of gold, which are arranged concentrically and supported so as to be capable of relative displacement in the axial direction, as in the case of the conventional apparatus described above. The molds 18a and 18b are provided. Both the molds 18a and 18b are respectively provided with a rolling surface forming recess 19 and a circular hole 20 that are concentric with each other. Of these, the rolling surface forming recesses 19 are formed on the inner peripheral surfaces of the opposite ends of the axial end surfaces of the molds 18a and 18b, and the spherical rollers 3 (see FIG. 3) and a shape and size corresponding to the shape and size of the rolling surface. That is, the inner surface dimensions (inner diameter and axial dimension) of the rolling surface forming recess 19 are similar (substantially coincident) to the outer surface shape of both end portions in the axial direction of the spherical roller 3. It is slightly larger than the outer surface dimensions (outer diameter and axial dimension) at both ends in the direction. This slightly larger portion is a cutting allowance for cutting or grinding performed as finishing. The sum (2L 19 ) of the axial dimension L 19 of the rolling surface forming recesses 19 of both the dies 18a and 18b is the intermediate material 16a produced by this embodiment {FIG. 1 and FIG. 2 (D). Smaller than the axial dimension L 16 of the reference} (2L 19 <L 16 ). Therefore, the opposing end surfaces of the molds 18a and 18b are not abutted to the end when the intermediate material 16a is processed.

又、上記両金型１８ａ、１８ｂの円孔部２０は、それぞれ上記転動面形成用凹部１９の奥端面から、これら両金型１８ａ、１８ｂの軸方向反対側端面（これら両金型１８ａ、１８ｂ同士で互いに反対側の端面）にまで達する状態（これら両金型１８ａ、１８ｂを軸方向に貫通する状態）で形成している。上記円孔部２０の内径Ｒ20は、上記球面ころ３を造る為の、金属製で円柱状の素材１５｛図２の（Ａ）（Ｂ）参照｝の外径Ｄ15と同じか、この外径Ｄ15よりも僅かに（造るべき球面ころの直径にもよるが、数μｍ〜数十μｍ程度）大きく（Ｒ20≧Ｄ15）している。但し、何れか一方の金型の円孔部２０に関しては、上記素材１５の一端部を締り嵌めで内嵌できる様に、この素材１５の外径よりも僅かに小さくする事もできる。 Further, the circular hole portions 20 of both the molds 18a and 18b respectively extend from the rear end surface of the rolling surface forming recess 19 to the axially opposite end surfaces of the both molds 18a and 18b (the both molds 18a, 18b, 18b are formed so as to reach the end surfaces opposite to each other (a state of passing through both molds 18a and 18b in the axial direction). The inner diameter R 20 of the circular hole portion 20 is the same as the outer diameter D 15 of the metal and cylindrical material 15 {see FIGS. 2A and 2B} for making the spherical roller 3. It is slightly larger (R 20 ≧ D 15 ) than the outer diameter D 15 (depending on the diameter of the spherical roller to be manufactured, but about several μm to several tens μm). However, the circular hole portion 20 of one of the molds can be made slightly smaller than the outer diameter of the material 15 so that one end of the material 15 can be fitted with an interference fit.

そして、上記両金型１８ａ、１８ｂの円孔部２０、２０にパンチ２１、２１を、これら両金型１８ａ、１８ｂの内側で軸方向の変位を可能として設置している。これら両パンチ２１、２１は、上記球面ころ３の軸方向両端面中央部に円形の凹部７、７を形成する為のもので、互いに同心に配置されており、互いに対向する先端面の中央部に、上記両凹部７、７を形成する為の、円すい台状の凸部２２、２２を形成している。図示の実施例の場合、上記両パンチ２１、２１を、ロッド２３とスリーブ２４とを組み合わせる事により構成している。即ち、このスリーブ２４内にこのロッド２３を隙間なく嵌合固定し、このロッド２３の先端部でこのスリーブ２４の先端面から突出した部分を、上記凸部２２としている。これらロッド２３とスリーブ２４とは、上記円孔部２０の内側で、同期して軸方向に移動する。   The punches 21 and 21 are installed in the circular hole portions 20 and 20 of both the molds 18a and 18b so as to be axially displaceable inside the molds 18a and 18b. These punches 21 and 21 are for forming circular recesses 7 and 7 in the central portions of both end surfaces in the axial direction of the spherical roller 3, and are arranged concentrically with each other, and the central portions of the tip surfaces facing each other. In addition, conical convex portions 22 and 22 for forming the concave portions 7 and 7 are formed. In the case of the illustrated embodiment, both the punches 21 and 21 are configured by combining a rod 23 and a sleeve 24. That is, the rod 23 is fitted and fixed in the sleeve 24 without a gap, and the protruding portion 22 is a portion protruding from the distal end surface of the sleeve 24 at the distal end portion of the rod 23. The rod 23 and the sleeve 24 move in the axial direction synchronously inside the circular hole portion 20.

又、図示の実施例の場合には、上記両金型１８ａ、１８ｂを、それぞれホルダ２５ａ、２５ｂ内に保持固定している。これら両ホルダ２５ａ、２５ｂは、互いに対向する端面である先端面の中央部にそれぞれ開口する、円形の保持凹部２６ａ、２６ｂを有する。上記両金型１８ａ、１８ｂは、これら両保持凹部２６ａ、２６ｂ内に、締り嵌め、ねじ止め等により内嵌固定している。又、一方（図１の右方）のホルダ２５ａの先端面（図１の左端面）で上記保持凹部２６ａの周囲部分に、円形のガイド凹部２７を形成している。前記素材１５を前記中間素材１６ａに加工する際には、他方（図１の左方）のホルダ２５ｂの先端部（図１の右端部）を上記ガイド凹部２７内に、がたつきなく、且つ軸方向の摺動を可能に嵌合する。この状態で、上記両金型１８ａ、１８ｂが互いに同心となる。   In the illustrated embodiment, both the molds 18a and 18b are held and fixed in the holders 25a and 25b, respectively. Both of the holders 25a and 25b have circular holding recesses 26a and 26b that open at the center of the front end surface, which is an end surface facing each other. The molds 18a and 18b are fitted and fixed in the holding recesses 26a and 26b by interference fitting, screwing, or the like. Further, a circular guide recess 27 is formed in the peripheral portion of the holding recess 26a on the tip surface (left end surface of FIG. 1) of one (right side in FIG. 1) holder 25a. When processing the material 15 into the intermediate material 16a, the tip (right end in FIG. 1) of the other (left side in FIG. 1) holder 25b is not rattled in the guide recess 27, and Fits so that it can slide in the axial direction. In this state, the molds 18a and 18b are concentric with each other.

更に、上記両ホルダ２５ａ、２５ｂを、それぞれ押圧ブロック２８ａ、２８ｂに支持している。これら両押圧ブロック２８ａ、２８ｂは、図示しない基台上に、軸方向（図１の左右方向）に関して相対的遠近動を可能として支持されている。そして、上記素材１５を上記中間素材１６ａに加工する際には、やはり図示しない油圧シリンダ、或は送りねじ同士等の、大きなスラスト力を付与自在な押圧装置により、互いに近づく方向に強く押し付け自在としている。尚、実際の場合には、上記両押圧ブロック２８ａ、２８ｂのうちの一方を上記基台に固定し、他方をこの基台上で移動させる。上記両ホルダ２５ａ、２５ｂは、この様な両押圧ブロック２８ａ、２８ｂに対し、若干の軸方向変位を可能としている。即ち、これら両ホルダ２５ａ、２５ｂの基端部外周面に形成した鍔部２９ａ、２９ｂを上記両押圧ブロック２８ａ、２８ｂの内周面に設けた大径部３０ａ、３０ｂに係合させている。従って、上記両ホルダ２５ａ、２５ｂは上記両押圧ブロック２８ａ、２８ｂに対し、上記鍔部２９ａ、２９ｂが上記大径部３０ａ、３０ｂの内側で軸方向に変位できる範囲で、若干の軸方向変位が可能である。   Further, the holders 25a and 25b are supported by the pressing blocks 28a and 28b, respectively. Both the pressing blocks 28a, 28b are supported on a base (not shown) so as to be capable of relative movement in the axial direction (left-right direction in FIG. 1). When the material 15 is processed into the intermediate material 16a, it can be strongly pressed toward each other by a pressing device that can apply a large thrust force such as a hydraulic cylinder (not shown) or feed screws. Yes. In an actual case, one of the pressing blocks 28a, 28b is fixed to the base and the other is moved on the base. The holders 25a and 25b can be slightly displaced in the axial direction with respect to the pressing blocks 28a and 28b. That is, the flange portions 29a and 29b formed on the outer peripheral surfaces of the base end portions of the holders 25a and 25b are engaged with the large diameter portions 30a and 30b provided on the inner peripheral surfaces of the pressing blocks 28a and 28b. Therefore, the holders 25a and 25b are slightly displaced in the axial direction within the range in which the flanges 29a and 29b can be displaced axially inside the large diameter portions 30a and 30b with respect to the pressing blocks 28a and 28b. Is possible.

又、上記両押圧ブロック２８ａ、２８ｂの基半部（互いに反対側の半部）に固定した固定ブロック３１ａ、３１ｂと上記両ホルダ２５ａ、２５ｂとの間に、特許請求の範囲に記載した弾性材に相当する、皿板ばね等のばね３２ａ、３２ｂを設けて、これら両ホルダ２５ａ、２５ｂを、互いに近づき合う方向に押圧している。これら各ばね３２ａ、３２ｂの弾力は、前記球面ころ３を造る為の前記素材１５を構成する金属材料が流動する力に対し、或る程度抵抗になる程に大きな値とする。具体的には、後述する様に、前記両パンチ２１、２１が互いに最も近づき合い、前記素材１５を構成する金属材料が前記転動面形成用凹部１９、１９内に充填された状態｛図１並びに後述する図２の（Ｄ）に示す状態｝で、これら両パンチ２１、２１の先端部外周縁と転動面形成用凹部１９、１９の奥端部内周縁とが連続する様に、上記弾性材（ばね）の弾力を規制する。尚、図示は省略するが、上記各ばね３２ａ、３２ｂが上記両ホルダ２５ａ、２５ｂを押圧する弾力を調節する為の調節機構を付している。   Also, the elastic material described in the claims between the fixed blocks 31a, 31b fixed to the base half portions (half portions opposite to each other) of the pressing blocks 28a, 28b and the holders 25a, 25b. The springs 32a and 32b, such as plate springs, corresponding to the above are provided, and both the holders 25a and 25b are pressed in a direction approaching each other. The elasticity of each of the springs 32a and 32b is set to such a large value that the resistance of the metal material constituting the material 15 for making the spherical roller 3 flows to some extent. Specifically, as will be described later, the punches 21 and 21 are closest to each other, and the metal material constituting the material 15 is filled in the rolling surface forming recesses 19 and 19 {FIG. In the state shown in (D) of FIG. 2 to be described later}, the elasticity of the punches 21 and 21 is such that the outer peripheral edge of the tip and the inner peripheral edge of the rear end of the rolling surface forming recesses 19 and 19 are continuous. Regulates the elasticity of the material (spring). In addition, although illustration is abbreviate | omitted, the adjustment mechanism for adjusting each spring 32a, 32b to adjust the elasticity which presses both the holders 25a, 25b is attached | subjected.

次に、上述の様なころ軸受用ころの製造装置を使用して、上記素材１５を塑性変形させ、上記中間素材１６ａとする工程に就いて、図２を参照しつつ説明する。
先ず、準備段階として、図２の（Ａ）に示す様に、上記素材１５を前記両金型１８ａ、１８ｂ同士の間に掛け渡す様にセットする。即ち、この工程では、上記素材１５の軸方向両端部を、上記両金型１８ａ、１８ｂの円孔部２０、２０に、ほぼ若しくは完全に隙間なく内嵌する。この作業は、上記両押圧ブロック２８ａ、２８ｂを互いに離れる方向に移動させ、上記ホルダ２５ｂの先端部を前記ガイド凹部２７から抜き取り、上記両金型１８ａ、１８ｂ同士を離隔させた状態で行なう。この状態で、例えば上記素材１５の軸方向一端部を一方の金型１８ａ（又は１８ｂ）の円孔部２０内に（好ましくは締り嵌めで）内嵌する事により、この金型１８ａ（又は１８ｂ）の中心軸と上記素材１５の中心軸とを一致させる。この素材１５の軸方向一端部と上記円孔部２０とは、この素材１５の軸方向一端面が前記両パンチ２１、２１のうちの一方のパンチ２１の先端面に突き当たるまで嵌合させられる（軸方向に或る程度寸法を持って嵌合させられる）ので、上記両中心軸同士を一致させる事は容易である。 Next, a process for plastically deforming the material 15 to form the intermediate material 16a using the roller bearing roller manufacturing apparatus as described above will be described with reference to FIG.
First, as a preparation stage, as shown in FIG. 2A, the material 15 is set so as to be bridged between the molds 18a and 18b. That is, in this step, both axial ends of the material 15 are fitted into the circular holes 20 and 20 of the molds 18a and 18b almost or completely without a gap. This operation is performed in a state where the pressing blocks 28a and 28b are moved away from each other, the tip of the holder 25b is removed from the guide recess 27, and the molds 18a and 18b are separated from each other. In this state, for example, one end of the material 15 in the axial direction is fitted into the circular hole portion 20 of one mold 18a (or 18b) (preferably with an interference fit) to thereby form the mold 18a (or 18b). ) And the center axis of the material 15 are matched. The one end of the material 15 in the axial direction and the circular hole portion 20 are fitted until the one end surface of the material 15 in the axial direction hits the tip surface of one of the punches 21 and 21 ( Therefore, it is easy to make the two central axes coincide with each other.

その後、上記両押圧ブロック２８ａ、２８ｂを互いに近づく方向に移動させ、上記ホルダ２５ｂの先端部を上記ガイド凹部２７内に差し込み、上記両金型１８ａ、１８ｂ同士を互いに近づける。この結果、上記素材１５の軸方向他端部が、金型１８ｂ（又は１８ａ）の円孔部２０内に、ほぼ隙間なく挿入（嵌合）される。又、この素材１５の軸方向両端面が上記両パンチ２１、２１の先端面に突き当たり、図２の（Ａ）に示す様な、準備工程が完了した状態となる。そしてこの状態から、上記両パンチ２１、２１を、上記両押圧ブロック２８ａ、２８ｂと共に、更に互いに近づく方向に移動させ、図２の（Ｂ）に示す様に、これら両パンチ２１、２１の先端面中央部に設けた凸部２２、２２（ロッド２３、２３の先端部でスリーブ２４、２４の先端面から突出した部分）を、上記素材１５の両端面中央部に食い込ませる。この場合に、上記両パンチ２１、２１と上記両押圧ブロック２８ａ、２８ｂとは、これら両パンチ２１、２１と両押圧ブロック２８ａ、２８ｂとの相対位置関係が変わらない様に｛図２の（Ａ）、（Ｂ）に示す距離イを同じとしたまま｝移動させる。   Thereafter, the pressing blocks 28a and 28b are moved in a direction approaching each other, the tip of the holder 25b is inserted into the guide recess 27, and the molds 18a and 18b are brought close to each other. As a result, the other axial end of the material 15 is inserted (fitted) into the circular hole 20 of the mold 18b (or 18a) with almost no gap. Further, both end faces in the axial direction of the material 15 abut against the tip faces of the punches 21 and 21, and the preparation process is completed as shown in FIG. Then, from this state, the punches 21 and 21 are moved together with the pressing blocks 28a and 28b in a direction closer to each other, and as shown in FIG. The convex portions 22 and 22 provided at the central portion (the portions protruding from the distal end surfaces of the sleeves 24 and 24 at the distal end portions of the rods 23 and 23) are bitten into the central portions of both end surfaces of the material 15. In this case, the punches 21 and 21 and the pressing blocks 28a and 28b are arranged so that the relative positional relationship between the punches 21 and 21 and the pressing blocks 28a and 28b does not change (see FIG. ) And (B) with the same distance a shown in FIG.

この結果、この素材１５の両端面中央部に凹部７、７が形成される。この様にして行なう凹部加工工程では、この素材１５は、その軸方向両端部が上記両金型１８ａ、１８ｂの円孔部２０、２０に内嵌された状態となっており、上記素材１５の軸方向両端部の外径が拡がる事はない。従って、上記両凹部７、７を形成する際には、上記素材１５の軸方向両端部に存在する金属材料が径方向外方に流動する事はない。この為、この素材１５の軸方向両端面には、上記両パンチ２１、２１の先端面に形成した凸部２２、２２の形状に合致する凹部７、７を形成する事ができる。   As a result, recesses 7 and 7 are formed at the center of both end faces of the material 15. In the recess processing step performed in this way, the material 15 is in a state in which both ends in the axial direction are fitted in the circular holes 20 and 20 of the molds 18a and 18b. The outer diameter at both ends in the axial direction does not expand. Accordingly, when forming both the concave portions 7, the metal material existing at both axial ends of the material 15 does not flow radially outward. For this reason, concave portions 7, 7 matching the shape of the convex portions 22, 22 formed on the tip surfaces of the punches 21, 21 can be formed on both end surfaces of the material 15 in the axial direction.

又、この様に凹部７、７が形成された状態で、上記両押圧ブロック２８ａ、２８ｂは停止する。即ち、これら両押圧ブロック２８ａ、２８ｂは、上述の様な図２の（Ｂ）に示した状態で、互いの間隔が狭まる方向、或は、拡がる方向に移動する事がなくなる。従って、上記両金型１８ａ、１８ｂも、この図２の（Ｂ）に示した位置のまま、それ以上近づく事なく、一時停止する。但し、これら両金型１８ａ、１８ｂは、上記両押圧ブロック２８ａ、２８ｂと前記両ホルダ２５ａ、２５ｂとの間に設けた前記ばね３２ａ、３２ｂの弾力により、互いに近づく方向の大きな弾力を付与された状態となる。従って、上記両金型１８ａ、１８ｂ同士の間隔は、互いに離れる方向に大きな力が加わった場合には拡がる状態となっている。   In addition, in the state where the recesses 7 and 7 are formed in this way, both the pressing blocks 28a and 28b are stopped. That is, both the pressing blocks 28a and 28b do not move in the direction in which the distance between them is narrowed or expanded in the state shown in FIG. 2B as described above. Accordingly, both the molds 18a and 18b are also temporarily stopped without approaching further in the position shown in FIG. However, these two dies 18a and 18b were given a large elasticity in the direction approaching each other by the elasticity of the springs 32a and 32b provided between the pressing blocks 28a and 28b and the holders 25a and 25b. It becomes a state. Accordingly, the distance between the molds 18a and 18b is in a state of being widened when a large force is applied in a direction away from each other.

一方、上記両パンチ２１、２１は、上述の様にして上記素材１５の軸方向両端面に凹部７、７が形成された後も、図２の（Ｃ）に示す様に、そのまま停止する事なく前進を続け、この素材１５を更に軸方向に圧縮する。この結果、この素材１５を構成する金属材料が径方向外方に流動して、上記両金型１８ａ、１８ｂの転動面形成用凹部１９、１９内に入り込む。そして、図２の（Ｄ）に示す様に、上記素材１５の両端部外周面及び軸方向両端縁部の形状が、これら転動面形成用凹部１９、１９の内面形状に合致し、得るべき球面ころ３（図５参照）の転動面に近似した外面形状を有する、中間素材１６ａとなる。   On the other hand, both the punches 21 and 21 are stopped as shown in FIG. 2C even after the recesses 7 and 7 are formed on both axial end surfaces of the material 15 as described above. Continue to move forward and compress the material 15 further in the axial direction. As a result, the metal material constituting the material 15 flows radially outward and enters the rolling surface forming recesses 19 and 19 of the molds 18a and 18b. Then, as shown in FIG. 2D, the shape of the outer peripheral surface of both end portions and both end edge portions in the axial direction of the material 15 matches the inner surface shape of the rolling surface forming recesses 19 and 19, and should be obtained. The intermediate material 16a has an outer surface shape approximate to the rolling surface of the spherical roller 3 (see FIG. 5).

この様な転動面加工工程では、上記両転動面形成用凹部１９、１９内に充填された金属材料が、これら両転動面形成用凹部１９、１９の奥端面３３、３３を押圧するが、この押圧力は、上記両金型１８ａ、１８ｂ同士を互いに離隔させる方向に加わる。但し、この状態では、前記押圧ブロック２８ａ、２８ｂは停止しており、上記両金型１８ａ、１８ｂは、前記ばね３２ａ、３２ｂの大きな弾力により互いに近づく方向に押されている。従って、これら両金型１８ａ、１８ｂは、この弾力と、上記金属材料の流動に基づく押圧力とが釣り合った部分に移動（退避）する。本実施例の場合には、上記両奥端面３３、３３と上記両パンチ２１、２１を構成するスリーブ２４、２４の先端面とが一致した部分にまで上記両金型１８ａ、１８ｂが移動（退避）した状態で上記中間素材１６ａの形成作業が終了する様に、上記素材１５の容積と上記両ばね３２ａ、３２ｂの弾力とを規制している。   In such a rolling surface machining step, the metal material filled in the both rolling surface forming recesses 19, 19 presses the back end surfaces 33, 33 of both the rolling surface forming recesses 19, 19. However, this pressing force is applied in the direction in which the molds 18a and 18b are separated from each other. However, in this state, the pressing blocks 28a and 28b are stopped, and the two dies 18a and 18b are pressed toward each other by the large elasticity of the springs 32a and 32b. Accordingly, the molds 18a and 18b move (retreat) to a portion where the elasticity and the pressing force based on the flow of the metal material are balanced. In the case of the present embodiment, the molds 18a and 18b move (retract) to a portion where the back end surfaces 33 and 33 and the tip surfaces of the sleeves 24 and 24 constituting the punches 21 and 21 coincide with each other. The volume of the material 15 and the elasticity of the springs 32a and 32b are regulated so that the forming operation of the intermediate material 16a is completed.

言い換えれば、上記両パンチ２１、２１が互いに最も近づき合い、上記素材１５を構成する金属材料が上記両転動面形成用凹部１９、１９内に充填された状態で、上記スリーブ２４、２４の先端部外周縁と上記転動面形成用凹部１９、１９の奥端部内周縁とが連続し、上記素材１５の軸方向両端部が円孔部２０、２０から押し出され切る｛円孔部２０、２０に嵌合されなくなって円孔部２０、２０よる拘束（嵌合）が解除される｝様に、上記素材１５の容積と上記両ばね３２ａ、３２ｂの弾力とを規制している。これら容積と弾力との適正値は、実験的に、或は、計算（シミュレーション）により求める。尚、上記中間素材１６ａの軸方向中間部外周面で、上記両金型１８ａ、１８ｂの不連続部分は、径方向外方に膨らむが、この部分は後から行なう仕上加工により除去する。この点は、従来の製造方法及び製造装置の場合と同様である。   In other words, the tips of the sleeves 24 and 24 are in a state where the punches 21 and 21 are closest to each other and the metal material constituting the material 15 is filled in the recesses 19 and 19 for forming the rolling surfaces. The outer peripheral edge of the part and the inner peripheral edge of the inner end of the rolling surface forming recesses 19 and 19 are continuous, and both end portions in the axial direction of the material 15 are pushed out of the circular hole parts 20 and 20 {the circular hole parts 20 and 20. The volume of the material 15 and the elasticity of the two springs 32a and 32b are restricted so that the restriction (fitting) by the circular hole portions 20 and 20 is released. The appropriate values of volume and elasticity are obtained experimentally or by calculation (simulation). The discontinuous portions of the molds 18a and 18b bulge outward in the radial direction on the outer peripheral surface of the intermediate material 16a in the axial direction, but these portions are removed by finishing processing performed later. This is the same as in the case of the conventional manufacturing method and manufacturing apparatus.

上述の様にして中間素材１６ａを造ったならば、上記両押圧ブロック２８ａ、２８ｂを互いに遠ざかる方向に移動（退避）させて上記両金型１８ａ、１８ｂ同士の間隔を拡げ、上記中間素材１６ａを取り出す。そして、取り出した中間素材１６ａに、切削、研削等の、必要とする仕上加工を施して、図５に示す様な球面ころ３とする。本実施例により造られた上記中間素材１６ａの形状は、この球面ころ３の形状に近い為、上記仕上加工時の取代を少なく抑える事ができて、この仕上加工に要する時間を短縮できる等、上記球面ころ３の加工コストの低減を図れる。   When the intermediate material 16a is manufactured as described above, the pressing blocks 28a, 28b are moved (retracted) in the direction away from each other to increase the distance between the molds 18a, 18b, and the intermediate material 16a is Take out. Then, the finished intermediate material 16a is subjected to necessary finishing processing such as cutting and grinding to obtain a spherical roller 3 as shown in FIG. Since the shape of the intermediate material 16a made according to the present embodiment is close to the shape of the spherical roller 3, the machining allowance during the finishing process can be reduced, and the time required for the finishing process can be shortened. The processing cost of the spherical roller 3 can be reduced.

図３〜４は、本発明の実施例２を示している。上述した実施例１が、金型１８ａ、１８ｂの互いに対向する端面同士を突き合わせない（当接させない）状態で、素材１５を中間素材１６ａに形成する作業を行なうのに対し、本実施例の場合には、金型１８ａ、１８ｂの互いに対向する端面同士を突き合わせた（当接させた）状態で形成作業を行なう。これに伴い、両押圧ブロック２８ａ、２８ｂの基半部（互いに反対側の半部）に固定した固定ブロック３１ａ、３１ｂと両ホルダ２５ａ、２５ｂとが、上記素材１５が上記中間素材１６ａに加工された状態｛図３並びに図４の（Ｄ）に示す状態｝で、軸方向隙間を介して対向する様にしている。尚、この様な軸方向隙間は、何れか一方のホルダとこのホルダに対向する固定ブロックとの間にのみ存在する様にしても良い。   3 to 4 show a second embodiment of the present invention. In the case of the present embodiment, the first embodiment described above performs the work of forming the material 15 on the intermediate material 16a in a state where the end faces facing each other of the molds 18a and 18b are not abutted (contacted). In this case, the forming operation is performed in a state in which the end faces facing each other of the molds 18a and 18b are abutted (abutted). Accordingly, the material 15 is processed into the intermediate material 16a by the fixing blocks 31a, 31b and the holders 25a, 25b fixed to the base half portions (half portions opposite to each other) of the pressing blocks 28a, 28b. In the state {the state shown in FIG. 3 and FIG. 4D}, they are opposed to each other through an axial gap. Such an axial gap may exist only between any one of the holders and a fixed block facing the holder.

この様な本実施例のころ軸受用ころの製造装置を使用して、上記素材１５を塑性変形させ、上記中間素材１６ａとする工程に就いて、図４を参照しつつ説明する。
先ず、上記両押圧ブロック２８ａ、２８ｂを互いに離れる方向に移動させ、上記ホルダ２５ｂの先端部をガイド凹部２７から抜き取り、上記両金型１８ａ、１８ｂ同士を離隔させた状態で、上記素材１５の軸方向一端部を一方の金型１８ａ（又は１８ｂ）の円孔部２０内に内嵌（好ましくは締り嵌めで）する。この状態で、この素材１５の軸方向一端面を一方のパンチ２１の先端面に突き当てるか否かは自由である。そして、上記両押圧ブロック２８ａ、２８ｂを互いに近づく方向に移動させ、上記ホルダ２５ｂの先端部を上記ガイド凹部２７内に差し込み、上記両金型１８ａ、１８ｂの互いに対向する端面同士を突き当てる。この状態で、図４の（Ａ）に示す様に、上記素材１５の軸方向両端部が、上記金型１８ｂ、１８ａの両円孔部２０、２０内に、ほぼ隙間なく挿入される。 The process of plastically deforming the material 15 to form the intermediate material 16a using the roller bearing roller manufacturing apparatus of this embodiment will be described with reference to FIG.
First, the pressing blocks 28a and 28b are moved away from each other, the tip of the holder 25b is extracted from the guide recess 27, and the molds 18a and 18b are separated from each other. One end in the direction is internally fitted (preferably an interference fit) into the circular hole 20 of one mold 18a (or 18b). In this state, whether or not one end surface in the axial direction of the material 15 abuts against the front end surface of one punch 21 is free. Then, both the pressing blocks 28a and 28b are moved in a direction approaching each other, the tip end portion of the holder 25b is inserted into the guide concave portion 27, and the opposite end surfaces of the molds 18a and 18b are brought into contact with each other. In this state, as shown in FIG. 4A, both end portions in the axial direction of the material 15 are inserted into the circular hole portions 20 and 20 of the molds 18b and 18a with almost no gap.

又、この様に両金型１８ａ、１８ｂの互いに対向する端面同士が突き当たった状態で、、更に上記押圧ブロック２８ａ、２８ｂを互いに近づく方向に移動させる。そして、前記固定ブロック３１ａ、３１ｂと前記両ホルダ２５ａ、２５ｂとの間に設けたばね３２ａ、３２ｂにより、上記両金型１８ａ、１８ｂに所定の弾力が付与された状態で、上記両押圧ブロック２８ａ、２８ｂを停止する。本実施例の場合、これら両押圧ブロック２８ａ、２８ｂが停止した状態で、上記両金型１８ａ、１８ｂに、上記素材１５を塑性変形させている際に互いの間隔が拡がらない様な（互いに対向する端面同士を当接させたままの状態を維持できる様な）十分な力が付与される様に、上記ばね３２ａ、３２ｂの弾力を規制している。但し、上記素材１５の容積が大き過ぎて、この素材１５が、上記両金型１８ａ、１８ｂのキャビティ内に収まり切らなくなった場合に、上記金型１８ａ、１８ｂが互いに離れる方向に移動（退避）する様に、上記ばね３２ａ、３２ｂの弾力を規制する。   In addition, the pressing blocks 28a and 28b are further moved in a direction approaching each other with the opposing end surfaces of the molds 18a and 18b abutting each other. Then, in a state where predetermined elasticity is applied to the molds 18a and 18b by the springs 32a and 32b provided between the fixed blocks 31a and 31b and the holders 25a and 25b, both the pressing blocks 28a and 28b is stopped. In the case of the present embodiment, when both the pressing blocks 28a and 28b are stopped, the distance between the two molds 18a and 18b is not expanded when the material 15 is plastically deformed (to each other). The elasticity of the springs 32a and 32b is regulated so that a sufficient force is applied so that the opposing end faces can be kept in contact with each other. However, when the volume of the material 15 is too large and the material 15 cannot fit into the cavities of the molds 18a and 18b, the molds 18a and 18b move (retract) in a direction away from each other. Thus, the elasticity of the springs 32a and 32b is restricted.

そして、この様な図４の（Ａ）に示す状態から、１対のパンチ２１、２１を互いに近づく方向に移動（前進）させて、図４の（Ｂ）に示す様に、これら両パンチ２１、２１の先端を上記素材１５の軸方向両端面に突き当てる。これら両パンチ２１、２１は、上記図４の（Ｂ）に示した状態から更に前進させて、図４の（Ｃ）に示す様に、それぞれの先端面中央部に設けた凸部２２、２２（ロッド２３、２３の先端部でスリーブ２４、２４の先端面から突出した部分）を、上記素材１５の両端面中央部に食い込ませる。この結果、この素材１５の両端面中央部に凹部７、７が形成される。又、これと共に、この素材１５の軸方向中央部に存在する金属材料が径方向外方に流動し、上記両金型１８ａ、１８ｂの転動面形成用凹部１９、１９内に入り込む。そして、。図４の（Ｄ）に示す様に、上記両パンチ２１、２１が互いに最も近づき合い、上記スリーブ２４、２４の先端部外周縁と上記転動面形成用凹部１９、１９の奥端部内周縁とが連続した状態で、上記素材１５を構成する金属材料が上記両転動面形成用凹部１９、１９内に充填される。この状態で、上記素材１５の両端部外周面及び軸方向両端縁部の形状が、これら転動面形成用凹部１９、１９の内面形状に合致し、得るべき球面ころ３（図５参照）の転動面に近似した外面形状を有する、中間素材１６ａとなる。   Then, from the state shown in FIG. 4A, the pair of punches 21 and 21 are moved (advanced) in a direction approaching each other, and as shown in FIG. , 21 abuts against both axial end surfaces of the material 15. These two punches 21 and 21 are further advanced from the state shown in FIG. 4B, and as shown in FIG. 4C, convex portions 22 and 22 provided at the center portions of the respective front end surfaces. (Parts protruding from the front end surfaces of the sleeves 24, 24 at the front ends of the rods 23, 23) are bitten into the center of both end surfaces of the material 15. As a result, recesses 7 and 7 are formed at the center of both end faces of the material 15. At the same time, the metal material present in the central portion in the axial direction of the material 15 flows radially outward and enters the rolling surface forming recesses 19 and 19 of the molds 18a and 18b. And. As shown in FIG. 4D, the punches 21 and 21 come closest to each other, the outer peripheral edge of the sleeves 24 and 24 and the inner peripheral edge of the rear end of the rolling surface forming recesses 19 and 19. Are filled in the both rolling surface forming recesses 19 and 19 with the metal material constituting the material 15. In this state, the shape of the outer peripheral surface of both end portions and the both end edge portions in the axial direction of the material 15 matches the inner surface shape of the rolling surface forming recesses 19 and 19, and the spherical roller 3 to be obtained (see FIG. 5). The intermediate material 16a has an outer surface shape approximating the rolling surface.

この様に本実施例の場合には、凹部加工工程を行ないつつ、転動面加工工程を行なう。但し、上記凹部７、７が形成される際、上記素材１５は、その軸方向両端部が上記両金型１８ａ、１８ｂの円孔部２０、２０に内嵌された状態となっており、この素材１５の軸方向両端部の外径が拡がる事はない。従って、上記両凹部７、７を形成する際に、上記素材１５の軸方向両端部に存在する金属材料が径方向外方に流動する事はない。この為、この素材１５の軸方向両端面には、上記両パンチ２１、２１の先端面に形成した凸部２２、２２の形状に合致する凹部７、７を形成する事ができる。
尚、本実施例の場合は、図４の（Ａ）に示す状態、即ち、両金型１８ａ、１８ｂの互いに対向する端面同士が突き当たった状態で、素材１５の軸方向両端面と両パンチ２１、２１の先端面とが隙間を介して対向する様に規制している。但し、図示は省略するが、上記両金型１８ａ、１８ｂの互いに対向する端面同士が突き当たった状態で、素材１５の軸方向両端面と両パンチ２１、２１の先端面とが突き当たる｛図４の（Ｂ）に相当｝様に規制しても良い。又、上記両金型１８ａ、１８ｂの互いに対向する端面同士が突き当たった状態で、素材１５の軸方向両端面に凹部７、７が形成される｛図４の（Ｃ）、（Ｄ）に相当｝様に規制しても良い。
その他の構成及び作用は、前述した実施例１と同様であるから、重複する説明は省略する。 Thus, in the case of a present Example, a rolling surface process process is performed, performing a recessed part process process. However, when the recesses 7 and 7 are formed, the material 15 is in a state in which both end portions in the axial direction are fitted in the circular hole portions 20 and 20 of the molds 18a and 18b. The outer diameter of both ends in the axial direction of the material 15 does not increase. Therefore, when forming both the concave portions 7, the metal material existing at both axial end portions of the material 15 does not flow radially outward. For this reason, concave portions 7, 7 matching the shape of the convex portions 22, 22 formed on the tip surfaces of the punches 21, 21 can be formed on both end surfaces of the material 15 in the axial direction.
In the case of the present embodiment, both the end faces in the axial direction of the material 15 and both punches 21 in the state shown in FIG. 4A, that is, the end faces facing each other of the molds 18a and 18b abut each other. , 21 so as to be opposed to each other through a gap. However, although illustration is omitted, in the state where the end faces facing each other of the molds 18a and 18b are in contact with each other, both axial end faces of the material 15 and the front end faces of both punches 21 and 21 are in contact { (Equivalent to (B)) may be regulated. In addition, the concave portions 7 and 7 are formed on both end surfaces in the axial direction of the material 15 in a state where the opposing end surfaces of the molds 18a and 18b are in contact with each other {corresponding to (C) and (D) in FIG. } May be regulated.
Other configurations and operations are the same as those of the first embodiment described above, and thus redundant description is omitted.

本発明の実施例１を示す、ころ軸受用ころの製造装置の断面図。Sectional drawing of the manufacturing apparatus of the roller bearing roller which shows Example 1 of this invention. 図１のＸ部を工程順に示す拡大断面図。The expanded sectional view which shows the X section of FIG. 1 in process order. 本発明の実施例２を示す、図１と同様の断面図。Sectional drawing similar to FIG. 1 which shows Example 2 of this invention. 図３のＹ部を工程順に示す拡大断面図。The expanded sectional view which shows the Y section of FIG. 3 in process order. 自動調心ころ軸受の１例を示す部分断面図。The fragmentary sectional view which shows one example of a self-aligning roller bearing. 従来の製造方法を示す部分拡大断面図。The partial expanded sectional view which shows the conventional manufacturing method.

符号の説明Explanation of symbols

１ 外輪
２ 内輪
３ 球面ころ
４ 保持器
５ 外輪軌道
６ 内輪軌道
７ 凹部
８ 舌片
９ ポケット
１０ 外向フランジ部
１１ 案内リング
１２ 内向フランジ部
１３ａ、１３ｂ 金型
１４ａ、１４ｂ 形成用凹部
１５ 素材
１６、１６ａ 中間素材
１７ 傾斜面部
１８ａ、１８ｂ 金型
１９ 転動面形成用凹部
２０ 円孔部
２１ パンチ
２２ 凸部
２３ ロッド
２４ スリーブ
２５ａ、２５ｂ ホルダ
２６ａ、２６ｂ 保持凹部
２７ ガイド凹部
２８ａ、２８ｂ 押圧ブロック
２９ａ、２９ｂ 鍔部
３０ａ、３０ｂ 大径部
３１ａ、３１ｂ 固定ブロック
３２ａ、３２ｂ ばね
３３ 奥端面 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Spherical roller 4 Cage 5 Outer ring raceway 6 Inner ring raceway 7 Recessed part 8 Tongue piece 9 Pocket 10 Outward flange part 11 Guide ring 12 Inward flange part 13a, 13b Mold 14a, 14b Forming concave part 15 Material 16, 16a Intermediate material 17 Inclined surface portion 18a, 18b Mold 19 Rolling surface forming concave portion 20 Circular hole portion 21 Punch 22 Convex portion 23 Rod 24 Sleeve 25a, 25b Holder 26a, 26b Holding concave portion 27 Guide concave portion 28a, 28b Press block 29a, 29b Gutter part 30a, 30b Large diameter part 31a, 31b Fixed block 32a, 32b Spring 33 Back end face

Claims (6)

金属製で円柱状の素材を塑性変形させる事により、外周面に相手軌道面と転がり接触する転動面を、軸方向両端面に凹部を、それぞれ備えたころ軸受用ころとする、ころ軸受用ころの製造方法であって、
軸方向に関して互いに遠近動する１対の金型に形成した各円孔部に上記素材の軸方向両端部を内嵌する事により、この素材の軸方向両端部の外径が拡がるのを阻止した状態でこの素材の軸方向両端面に１対のパンチを、互いに近づき合う方向に押し付けて、これら軸方向両端面に上記両凹部を形成する凹部加工工程と、
これら両凹部を形成した後、又は、これら両凹部を形成しつつ、互いに近づき合う上記両パンチにより上記素材を軸方向に圧縮し、この素材を構成する金属材料を径方向外方に流動させる事でこの金属材料を、上記両金型の端部内周面に形成された、上記各円孔部と同心の転動面形成用凹部内に充填して、上記転動面となる部分を形成する転動面加工工程とを備える
ころ軸受用ころの製造方法。 For roller bearings, which are made of metal and made of cylindrical material by plastic deformation, make the rolling contact surface in rolling contact with the mating raceway surface on the outer peripheral surface and the roller bearing roller with recesses on both axial end surfaces. A method of manufacturing a roller,
By fitting both ends in the axial direction of the material into the respective circular hole portions formed in a pair of molds that move far and away from each other in the axial direction, the outer diameter of the both ends in the axial direction of the material is prevented from expanding. A recess working step of pressing the pair of punches on both axial end surfaces of the material in a state in a direction approaching each other to form both concave portions on both axial end surfaces;
After forming these recesses, or while forming these recesses, compress the material in the axial direction by the punches approaching each other, and flow the metal material constituting the material radially outward. The metal material is filled into the rolling surface forming recesses concentric with the circular hole portions, which are formed on the inner peripheral surfaces of the end portions of the two molds, to form a portion that becomes the rolling surface. A method of manufacturing a roller bearing roller comprising a rolling surface machining step. 素材を構成する金属材料が転動面形成用凹部内に充填された状態で、この素材の軸方向両端部が円孔部から押し出され切る、請求項１に記載したころ軸受用ころの製造方法。   2. The method for manufacturing a roller bearing roller according to claim 1, wherein both end portions in the axial direction of the material are pushed out from the circular hole portion in a state where the metal material constituting the material is filled in the rolling surface forming recess. . 金属製で円柱状の素材を塑性変形させる事により、外周面に相手軌道面と転がり接触する転動面を、軸方向両端面に凹部を、それぞれ備えたころ軸受用ころとする為のころ軸受用ころの製造装置であって、
互いに同心に配置されて軸方向に関する相対変位を可能として支持された、それぞれが円筒状である１対の金型を備え、これら両金型は、互いに対向する側の端部内周面に上記転動面の形状及び寸法に見合う形状及び寸法を有する転動面形成用凹部を、この転動面形成用凹部よりも奥部にこの転動面形成用凹部と同心で上記素材の両端部をほぼ隙間なく内嵌自在な円孔部を、それぞれ形成したものであり、
上記両金型の円孔部に、それぞれの先端面に上記凹部を形成する為の凸部を有するパンチを、これら両金型の内側で軸方向の変位を可能として設置している
ころ軸受用ころの製造装置。 Roller bearings for use as roller bearing rollers, which are made of metal and cylindrically deformed, and have rolling surfaces that are in rolling contact with the mating raceway surface on the outer peripheral surface and recesses on both end surfaces in the axial direction. Manufacturing equipment for rollers,
A pair of molds each having a cylindrical shape and supported concentrically with each other and capable of relative displacement in the axial direction are provided, and both the molds are arranged on the inner peripheral surface of the end portion facing each other. A rolling surface forming concave portion having a shape and a dimension that matches the shape and size of the moving surface is disposed at a position deeper than the rolling surface forming concave portion, and the both end portions of the material are substantially concentric with the rolling surface forming concave portion. Each is formed with a circular hole that can be fitted without a gap,
Punches having convex portions for forming the concave portions on the respective front end surfaces are installed in the circular hole portions of both the molds so that axial displacement is possible inside these molds. For roller bearings Roller manufacturing equipment. １対の金型をそれぞれ支持固定した１対のホルダを、互いに遠近動を可能とした１対の押圧ブロックに対し、上記両金型の軸方向の変位を可能として支持すると共に、これら両押圧ブロックと上記両ホルダとの間に、これら両ホルダを互いに近づき合う方向に押圧する弾性材を設置している、請求項３に記載したころ軸受用ころの製造装置。   A pair of holders, each supporting and fixing a pair of molds, are supported by a pair of pressing blocks that can move in the distance from each other so that the two molds can be displaced in the axial direction. The roller bearing roller manufacturing apparatus according to claim 3, wherein an elastic material is provided between the block and the holders to press the holders in a direction approaching each other. 両パンチが互いに最も近づき合い、素材を構成する金属材料が転動面形成用凹部内に充填された状態で、これら両パンチの先端部外周縁と転動面形成用凹部の奥端部内周縁とが連続する様に、弾性材の弾力を規制した、請求項４に記載したころ軸受用ころの製造装置。   In a state where both punches are closest to each other and the metal material constituting the raw material is filled in the rolling surface forming recess, the outer peripheral edge of the tip end of both punches and the inner peripheral edge of the deep end of the rolling surface forming recess The roller bearing roller manufacturing apparatus according to claim 4, wherein the elasticity of the elastic material is regulated so that the length of the elastic material is continuous. 弾性材がばねである、請求項４〜５の何れかに記載したころ軸受用ころの製造装置。   The roller bearing roller manufacturing apparatus according to any one of claims 4 to 5, wherein the elastic material is a spring.
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WO2019021551A1 (en) * 2017-07-28 2019-01-31 日本精工株式会社 Mold device for manufacturing columnar rolling element, method for manufacturing columnar rolling element, method for manufacturing rolling bearing, method for manufacturing vehicle, and method for manufacturing machine device

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JP6402847B1 (en) * 2017-07-28 2018-10-10 日本精工株式会社 Mold apparatus for manufacturing cylindrical rolling element, manufacturing method of cylindrical rolling element, manufacturing method of rolling bearing, manufacturing method of vehicle, and manufacturing method of mechanical device
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US10525522B2 (en) 2017-07-28 2020-01-07 Nsk Ltd. 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
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