WO2012115201A1 - 分割軌道輪およびその製造方法 - Google Patents
分割軌道輪およびその製造方法 Download PDFInfo
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- WO2012115201A1 WO2012115201A1 PCT/JP2012/054445 JP2012054445W WO2012115201A1 WO 2012115201 A1 WO2012115201 A1 WO 2012115201A1 JP 2012054445 W JP2012054445 W JP 2012054445W WO 2012115201 A1 WO2012115201 A1 WO 2012115201A1
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- ring
- end side
- split
- raceway
- axial direction
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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
- F16C33/58—Raceways; Race rings
- F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
- B23D31/002—Breaking machines, i.e. pre-cutting and subsequent breaking
- B23D31/003—Breaking machines, i.e. pre-cutting and subsequent breaking for rings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
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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
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/046—Brasses; Bushes; Linings divided or split, e.g. half-bearings or rolled sleeves
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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
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/14—Special methods of manufacture; Running-in
-
- 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
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
- B23D31/002—Breaking machines, i.e. pre-cutting and subsequent breaking
- B23D2031/007—Breaking machines, i.e. pre-cutting and subsequent breaking for journals
-
- 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
- F16C19/24—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 radial load mainly
- F16C19/26—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 radial load mainly with a single row of rollers
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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
- F16C2202/00—Solid materials defined by their properties
- F16C2202/02—Mechanical properties
- F16C2202/04—Hardness
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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
- F16C2220/00—Shaping
- F16C2220/80—Shaping by separating parts, e.g. by severing, cracking
-
- 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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
-
- 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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/48—Particle sizes
-
- 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
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T225/00—Severing by tearing or breaking
- Y10T225/10—Methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T225/00—Severing by tearing or breaking
- Y10T225/10—Methods
- Y10T225/12—With preliminary weakening
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49643—Rotary bearing
- Y10T29/49647—Plain bearing
- Y10T29/49668—Sleeve or bushing making
Definitions
- the present invention relates to a split race ring and a method for manufacturing the same.
- split race ring that divides a race ring used for a rolling bearing into two in the circumferential direction is known in order to facilitate assembly and installation during manufacture.
- Such a divided raceway is generally manufactured by subjecting an annular raceway to heat treatment, splitting it into two by natural splitting, recombining them, and grinding the raceway surface.
- the surface roughness Rz of the fracture surface may be set to 30 ⁇ m to 1000 ⁇ m in order to facilitate alignment after division. It has been proposed (see, for example, Patent Document 9).
- the split raceway may be peeled off or breakage from the split position as a starting point, and it is necessary to improve the strength of the split position and the adhesion of the split surface. is there.
- a stress concentration source is provided as in Patent Documents 1, 2, and 3
- the stress concentration source may cause a decrease in durability.
- the machining allowance increases when the raceway is deformed into an elliptical shape due to deformation during heat treatment or plastic deformation during division.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a split race ring having good durability and a manufacturing method thereof.
- the hardness of the surface other than the circumferential end surface of the divided portion is HRC59 or more, the surface other than the circumferential end surface of the divided portion is subjected to quenching and tempering treatment, and the surface other than the circumferential end surface of the divided portion
- the dividing portion is formed by applying a load to the bearing ring so that a stress generated on one end side in the axial direction of the bearing ring is larger than a stress generated on the other end side in the axial direction.
- Divided raceway characterized by.
- a method for manufacturing a split race ring comprising: (5) It further has the process of providing a slit in the one end side, The method of manufacturing a split race ring according to (4), wherein a stress generated in the slit on the one end side is larger than a stress generated on the other end side. (6) It further has the process of providing a slit in the other end side, The method of manufacturing a split race ring according to (5), wherein a stress generated in the slit on the one end side is greater than a stress generated on the slit on the other end side.
- one end side and the other end side in the axial direction mean one side in the axial direction with the center in the axial direction as a boundary and the opposite side.
- split raceway and the manufacturing method thereof of the present invention it is possible to provide a split raceway having good durability and a manufacturing method thereof.
- FIG. 5 is a plan view showing an inner ring before division in the method for manufacturing a divided race ring according to an embodiment of the present invention. It is a side view of FIG. It is axial direction sectional drawing which shows the manufacturing method of the division
- FIG. 4 is a side view of FIG. 3.
- the inner ring 11 before the split is an annular trunk portion 12 and annular annular portions disposed on both axial sides of the trunk portion 12.
- wheel 11 are provided.
- the outer diameter surface of the body portion 12 is a raceway surface of a rolling element (not shown).
- the end portion 14 is provided with slits 17a and 17b extending in the axial direction.
- the slits 17a and 17b are provided on a straight line on both sides in the axial direction.
- slits 17 a ′ and 17 b ′ are provided at the end portion 14 even at a position rotated 180 ° in the circumferential direction from the position where the slits 17 a and 17 b are provided.
- the inner ring 11 before the division is subjected to quenching and tempering, carburizing treatment or carbonitriding treatment and quenching and tempering.
- the material used for the inner ring 11 contains 0.15 mass% or more and 1.20 mass% or less of carbon (C).
- C carbon
- C is less than 0.15% by mass, the durability of the inner ring 11 increases, but natural splitting becomes difficult, which is not preferable.
- C exceeds 1.20% by mass, it is not preferable because sufficient durability cannot be obtained.
- the content of components other than C is preferably in the following range.
- Si is an element having carburization resistance, it is preferably 2% by mass or less, and more preferably 0.35% by mass or less.
- the Cr content is preferably 20% by mass or less, and more preferably 1.2% by mass or less.
- the Mn content is preferably 2% by mass or less, and more preferably 0.85% by mass or less.
- Ni is preferably 4% by mass or less and more preferably 0.25% by mass or less because of workability.
- the other components are preferably Fe and unavoidable impurities.
- the surface hardness of the inner ring 11 is HRC59 or more.
- the prior austenite grain size (JIS G0551) on the surface of the inner ring 11 is 6 or more. If the surface hardness of the inner ring 11 is HRC59 or higher, the durability can be improved and the plastic deformation at the time of division does not increase, and the adhesion of the divided surface is improved. Further, if the prior austenite grain size is 6 or more, the split load increases, but the durability can be improved without forming a crystal fracture surface with a minute crack on the split surface. The finer the crystal grains, the better the durability.
- the “divided surface” means a circumferential end surface of each divided portion after the inner ring 11 is divided.
- a support jig 30 having a bottom surface 31, a top surface 32, and side surfaces 33, 33 is inserted into the inner diameter side of the cylindrical inner ring 11.
- the top surface 32 of the support jig 30 and the inner diameter surface of the inner ring 11 are shown apart from each other for simplification.
- the support jig 30 has a shape in which the vertical dimension decreases from the one axial end 36 side to the other axial end 35 side, and the top surface 32 is an inclined surface.
- the bottom surface 31 of the support jig 30 is supported by the column portions 37 and 37 at the one end portion 36 in the axial direction and the other end portion 35 in the axial direction.
- the vertical dimensions of the pillars 37 and 37 are equal, and any dimensions may be used as long as the inner ring 11 is suspended by the support jig 30.
- the support jig 30 has upper edge portions 34 and 34 between the top surface 32 and the side surfaces 33 and 33. These upper edges 34, 34 suspend the inner diameter surface of the inner ring 11. It is preferable that the upper edge portions 34 and 34 that are in contact with the inner diameter surface of the inner ring 11 are chamfered at 1 mm or more and 30 mm or less. If the chamfering process is 1 mm or more, no indentation will be formed when it comes into contact with the inner diameter surface of the inner ring 11. Further, if the chamfering process is 30 mm or less, the amount of change in the support position after the occurrence of a crack does not become too large, and stability can be maintained.
- the chamfered shape is preferably an R shape.
- the inner ring 11 When breaking the inner ring 11, as described above, the inner ring 11 is suspended by the support jig 30 inserted on the inner diameter side so that the slits 17a and 17b are positioned upward in the vertical direction.
- the inner ring 11 is arranged such that the slit 17b is positioned on the one end 36 side in the axial direction of the support jig 30 and the slit 17a is positioned on the other end 35 side in the axial direction of the support jig 30, and the top surface 32 ( In particular at the edges).
- the lower surface 39 of the load jig 38 is placed adjacent to the slits 17a and 17b on the flanges 13 and 13 of the inner ring 11, and a load is applied to the inner ring 11 from above in the vertical direction.
- a load is applied to the both sides in the axial direction of the inner ring 11 via the lower surface 39 of the load jig 38 from above in the vertical direction.
- the top surface 32 of the support jig 30 has one end 36 in the axial direction. The side is disposed at a position higher than the other end 35 side in the axial direction.
- the top surface 32 of the support jig 30 is inclined with respect to the lower surface 39 of the load jig 38, and a larger stress is generated on the slit 17b side than on the slit 17a side. For this reason, it becomes possible to propagate a crack only from the slit 17b, and it is possible to prevent a mismatch of cracks that occurs when the crack propagates from both the slit 17a and the slit 17b.
- tilt angle (alpha) in which the top surface 32 of the support jig 30 inclines with respect to the lower surface 39 of the load jig 38 is 0.2 degree or more and 3 degrees or less.
- the inclination angle ⁇ is 0.2 ° or more and 3 ° or less, an uneven load is generated while maintaining stability, so that the stress generated in one slit is increased and the divided load can be reduced.
- the shape change due to plastic deformation of the inner ring 11 can be suppressed.
- the inner ring 11 is split from the slit 17b to the slit 17a in the axial direction, the inner ring 11 is divided into two divided parts by rotating the inner ring 11 180 ° in the circumferential direction and applying a load again. Can be obtained.
- An angle (hereinafter referred to as a contact angle) ⁇ (see FIG. 4) formed by a line connecting the contact portion (support point) closest to the portion to which the mark is added and the radial center of the inner ring 11 is 15 It is preferable that it is not less than 35 ° and not more than 35 °.
- the contact angle ⁇ is changed, the width of the support point is changed.
- the contact angle ⁇ is 15 ° or more and 35 ° or less, the divided load does not become too large, and the change amount of the support position after the occurrence of a crack does not become too large, and the stability can be maintained. It becomes.
- wheel 11 which performed the carburizing process or the carbonitriding process has high toughness inside, and a division
- the inner ring 11 subjected to quenching and tempering treatment is likely to have irregularities on the split surface.
- the arithmetic average roughness of the divided surface is 30 ⁇ mRa or more, the adhesion of the divided surface is increased by the unevenness, and the durability of the divided inner ring can be further improved.
- the arithmetic average roughness of the divided surface is preferably 1000 ⁇ mRa or less, and more preferably 500 ⁇ mRa or less, in order to suppress the occurrence of cracks.
- the shape of a division surface is a dimple shape, and by this, the adhesiveness of a division surface can further improve and durability can further be improved.
- the support jig 30 is formed in a column shape, and is supported by the column portions 37 and 37 and only the inner ring 11 is suspended by the upper edge portion 34. It is possible to apply.
- the support jig 30 is preferably formed with the hardness of a material such as carbon steel for mechanical structure without performing heat treatment or the like.
- the inner ring 11 has been subjected to quenching and tempering in advance, and the inner surface of the inner ring 11 is harder than the support jig 30, so that the inner surface of the inner ring 11 is scratched. It is possible to prevent the inner ring 11 from being deformed and the roundness of the inner diameter surface from being deteriorated.
- the support jig 30 may be made of a material having a Young's modulus smaller than that of the material forming the inner ring 11, for example, cast iron, copper-based metal, aluminum, or the like. When the support jig 30 is formed of these materials, even when the contact pressure between the upper edge portion 34 and the inner diameter surface of the inner ring 11 is increased, the support jig 30 is ahead of the inner diameter surface of the inner ring 11. It is possible to prevent the inner ring 11 from being damaged and the inner ring 11 from being deformed and the inner ring 11 from being deformed to deteriorate the roundness of the inner diameter surface.
- the inner ring 11 is divided in the circumferential direction by causing the crack to advance only from one slit 17b, so that the cutting can be performed without increasing the manufacturing cost.
- Surface disturbance can be suppressed and a good cut surface can be obtained.
- segmentation inner ring can further be improved by improving the adhesiveness of a division surface.
- the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like can be made as appropriate.
- the case where the inner ring 11 is divided has been described as an example, but the present invention can be applied even when the outer ring is divided.
- the case where the raceway is divided into two has been described as an example, but the raceway may be divided into three or more.
- the inclination angle (alpha) is implement
- the inclination angle ⁇ may be realized by using a spacer such as a shim.
- the slits are formed on both ends of the inner ring 11 in the axial direction.
- the slits may be formed only on one end in the axial direction or only on the other end in the axial direction.
- the slit does not need to be formed at either end in the axial direction of the inner ring 11.
- an inner ring of a cylindrical roller bearing was made of the material shown in Table 1, slits were made on both ends in the axial direction of the inner ring, and divided according to the conditions shown in FIGS. As shown in Table 1, the division was performed after performing heat treatment such as quenching and tempering, quenching and tempering after carbonitriding or carburizing treatment.
- the inner ring has an inner diameter of 109 mm, an outer diameter of 157 mm, and an axial dimension of 154 mm.
- the deformation amount indicates the value of Da-Db when combined again after division, that is, the difference between the maximum value and the minimum value of the raceway surface diameter (see FIG. 2). Further, in the durability test, the operation was performed with a radial load of 500 kN, the rotational speed of 15 min ⁇ 1 , and oil-air lubrication. .
- Comparative Example 1 the inclination angle ⁇ is 0 °, and the stress generated on one end side in the axial direction of the race is equal to the stress generated on the other end side in the axial direction.
- the endurance test could not be carried out because the split load was excessive, the amount of deformation was too large, and the split lines were inconsistent.
- Comparative Example 2 in which the surface hardness is outside the range of the present invention, the split load was excessive, the deformation amount was too large, and the durability test could not be performed.
- the crystal grain size is outside the scope of the present invention, and the shape of the dividing surface is not a dimple shape. As for Comparative Example 3, it can be seen that the endurance test was rejected due to the occurrence of cracks on the split surface during the endurance test, and the life was shortened.
- Example 15 the contact angle ⁇ is smaller than the preferred range of the present invention.
- Such Example 15 passed the endurance test, but at the upper edge portion 34, the position where the inner ring 11 was suspended was easily shifted upward during division, and the stability was slightly inferior.
- Example 19 whose contact angle (beta) is larger than the preferable range of this invention passed the durability test, the division
- the inclination angle ⁇ is outside the preferred range of the present invention.
- Example 23 passed the endurance test, since the area where the lower surface 39 of the load jig 38 contacts the inner ring 11 is small at the start of the division and the inner ring 11 is easily displaced in the axial direction, the stability is slightly inferior. .
Abstract
Description
(1) 円周方向に二以上に分割された分割部を含む分割軌道輪であって、
前記分割部の円周方向端面以外の表面の硬さがHRC59以上であり、前記分割部の円周方向端面以外の表面は焼入れ焼戻し処理が施されており、前記分割部の円周方向端面以外の表面の旧オーステナイト結晶粒度が6番以上であり、
前記分割部は、軌道輪の軸方向の一端側に発生する応力が軸方向の他端側に発生する応力より大きくなるように前記軌道輪に荷重を加えて分割することにより形成されていることを特徴とする分割軌道輪。
(2) 前記分割部の円周方向端面の算術平均粗さが30μmRa以上であり、且つ前記分割部の円周方向端面がディンプル状であることを特徴とする(1)記載の分割軌道輪。
(3) 前記分割部が、前記軌道輪の軸方向の一端側からのみ亀裂を進展させることにより形成されていることを特徴とする(1)または(2)記載の分割軌道輪。
(4) (1)~(3)のいずれかに記載の分割軌道輪を製造する方法であって、
前記軌道輪の軸方向の一端側に発生する応力が軸方向の他端側に発生する応力より大きくなるように、前記軌道輪に垂直方向上方から荷重を加えて前記軌道輪を分割する工程を有することを特徴とする分割軌道輪の製造方法。
(5) 前記一端側にスリットを設ける工程をさらに有し、
前記一端側の前記スリットに発生する応力が前記他端側に発生する応力よりも大きいことを特徴とする(4)記載の分割軌道輪の製造方法。
(6) 前記他端側にスリットを設ける工程をさらに有し、
前記一端側の前記スリットに発生する応力が前記他端側の前記スリットに発生する応力よりも大きいことを特徴とする(5)記載の分割軌道輪の製造方法。
(7) 前記軌道輪の内径側に柱形状の支持冶具を挿入する工程と、
前記支持冶具により前記軌道輪の内径面を担持する工程と、をさらに有し、
前記軌道輪に荷重を加える方向に対して垂直であり且つ前記軌道輪の径方向中心を通る面に対して、前記軌道輪と前記支持冶具が接触する部分のうち前記軌道輪の荷重が加えられた部分に一番近い接触部と、前記軌道輪の径方向中心と、を結んだ線のなす角度が、15°以上35°以下であることを特徴とする(4)~(6)のいずれか記載の製造方法。
17a,17b、17a’ スリット
30 支持冶具
32 頂面
38 荷重冶具
Claims (7)
- 円周方向に二以上に分割された分割部を含む分割軌道輪であって、
前記分割部の円周方向端面以外の表面の硬さがHRC59以上であり、前記分割部の円周方向端面以外の表面は焼入れ焼戻し処理が施されており、前記分割部の円周方向端面以外の表面の旧オーステナイト結晶粒度が6番以上であり、
前記分割部は、軌道輪の軸方向の一端側に発生する応力が軸方向の他端側に発生する応力より大きくなるように前記軌道輪に荷重を加えて分割することにより形成されていることを特徴とする分割軌道輪。 - 前記分割部の円周方向端面の算術平均粗さが30μmRa以上であり、且つ前記分割部の円周方向端面がディンプル状であることを特徴とする請求項1記載の分割軌道輪。
- 前記分割部が、前記軌道輪の軸方向の一端側からのみ亀裂を進展させることにより形成されていることを特徴とする請求項1または2記載の分割軌道輪。
- 請求項1~3のいずれか1項に記載の分割軌道輪を製造する方法であって、
前記軌道輪の軸方向の一端側に発生する応力が軸方向の他端側に発生する応力より大きくなるように、前記軌道輪に垂直方向上方から荷重を加えて前記軌道輪を分割する工程を有することを特徴とする分割軌道輪の製造方法。 - 前記一端側にスリットを設ける工程をさらに有し、
前記一端側の前記スリットに発生する応力が前記他端側に発生する応力よりも大きいことを特徴とする請求項4記載の分割軌道輪の製造方法。 - 前記他端側にスリットを設ける工程をさらに有し、
前記一端側の前記スリットに発生する応力が前記他端側の前記スリットに発生する応力よりも大きいことを特徴とする請求項5記載の分割軌道輪の製造方法。 - 前記軌道輪の内径側に柱形状の支持冶具を挿入する工程と、
前記支持冶具により前記軌道輪の内径面を担持する工程と、をさらに有し、
前記軌道輪に荷重を加える方向に対して垂直であり且つ前記軌道輪の径方向中心を通る面に対して、前記軌道輪と前記支持冶具が接触する部分のうち前記軌道輪の荷重が加えられた部分に一番近い接触部と、前記軌道輪の径方向中心と、を結んだ線のなす角度が、15°以上35°以下であることを特徴とする請求項4~6のいずれか1項記載の製造方法。
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US13/877,067 US8956055B2 (en) | 2011-02-25 | 2012-02-23 | Method for manufacturing split bearing ring |
EP12749401.1A EP2679844A4 (en) | 2011-02-25 | 2012-02-23 | Split bearing ring, and manufacturing method for same |
CN201280000443.XA CN102782351B (zh) | 2011-02-25 | 2012-02-23 | 剖分轴承套圈及其制造方法 |
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JP2012036462A JP5982861B2 (ja) | 2011-05-27 | 2012-02-22 | 分割軌道輪及び軸受の製造方法 |
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CN103878553B (zh) * | 2014-03-31 | 2016-04-06 | 西安北方光电科技防务有限公司 | 高精度v形环状轴承组件的加工方法 |
DE102016121412A1 (de) * | 2016-11-09 | 2018-05-09 | Robert Bosch Gmbh | Festlager und Lenkgetriebe |
CN113182629B (zh) * | 2021-05-08 | 2023-06-23 | 洛阳轴承研究所有限公司 | 一种剖分轴承套圈加工工装 |
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EP2679844A1 (en) | 2014-01-01 |
EP2679844A4 (en) | 2017-07-05 |
US8956055B2 (en) | 2015-02-17 |
CN102782351A (zh) | 2012-11-14 |
US20130209019A1 (en) | 2013-08-15 |
CN102782351B (zh) | 2015-07-01 |
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