WO2017169937A1 - Bearing ring-forming method - Google Patents

Bearing ring-forming method Download PDF

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Publication number
WO2017169937A1
WO2017169937A1 PCT/JP2017/011070 JP2017011070W WO2017169937A1 WO 2017169937 A1 WO2017169937 A1 WO 2017169937A1 JP 2017011070 W JP2017011070 W JP 2017011070W WO 2017169937 A1 WO2017169937 A1 WO 2017169937A1
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WO
WIPO (PCT)
Prior art keywords
ring
polishing
work
blank
thrust bearing
Prior art date
Application number
PCT/JP2017/011070
Other languages
French (fr)
Japanese (ja)
Inventor
和樹 平松
松永　浩司
大 中橋
昌巳 山口
和裕 金原
Original Assignee
Ntn株式会社
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Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2017169937A1 publication Critical patent/WO2017169937A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/06—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for grinding races, e.g. roller races
    • 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
    • F16C19/30—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 axial load mainly
    • 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
    • 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

Definitions

  • the present invention relates to a bearing ring forming method, and more particularly to a method for forming a bearing ring of a thrust bearing.
  • the structure of a press production line for a conventional thrust bearing raceway is generally formed by bending a washer shape or the outer periphery or inner periphery of a washer from a coil material (Rz 1.5 ⁇ m or less, about Ra 0.2 ⁇ m) by a transfer press. It is processed into a shape. After that, finish processing (barrel processing or the like) was required as shown in FIG. 23 to the surface roughness required for product accuracy.
  • Barrel processing is a polishing processing technique in which a workpiece 2 and a barrel media 3 are placed in a polishing tank called a barrel 1 and interact with each other as shown in FIG. It is described in Patent Document 1 that such barrel finishing is performed on the bearing ring of the thrust bearing. In addition, there is a technique that performs blasting as a finish (Patent Document 2).
  • the bearing ring of the thrust bearing is subjected to a heat treatment process after a molding process such as a blank process, a piercing process, and a burring process from the coil material, and then polished as a finish.
  • Processing for example, barrel processing
  • the present invention provides a bearing ring forming method that can form a bearing ring without depending on the surface roughness of the material, and can reduce intermediate stock by forming a line.
  • the method for forming a bearing ring for a thrust bearing according to the present invention performs a surface polishing process on a plate-shaped workpiece in a press line having a plurality of types of pressing processes.
  • the bearing ring forming method for a thrust bearing of the present invention since the workpiece has a flat plate shape in the surface polishing step, the entire workpiece surface can be polished uniformly and at high speed.
  • It has a blank process as a pressing process and has the surface polishing process before the blank process, or has a piercing process as the pressing process and has the surface polishing process before the piercing process.
  • the burring process or the drawing process may be included as the pressing process, and the surface polishing process may be performed before the burring process or the drawing process.
  • the bearing ring to be molded is an inner ring
  • the bearing ring to be molded is an outer ring
  • the bearing ring to be molded is a washer-shaped inner ring
  • the bearing ring to be molded is a washer-shaped outer ring.
  • the surface polishing step may include at least one of wheel polishing, brush polishing, belt polishing, and shot processing.
  • the entire workpiece surface can be polished uniformly and at high speed. That is, even when a coil material having a rough material roughness (for example, Ra 3 ⁇ m or less) is used, polishing can be performed in a short time (for example, several seconds). Further, by putting the polishing process between the press lines, it is possible to form a line without having an intermediate stock. For this reason, cost reduction and productivity improvement can be aimed at.
  • a coil material having a rough material roughness for example, Ra 3 ⁇ m or less
  • FIG. 3 is a sectional view of a three-way integral thrust bearing, showing a thrust bearing.
  • FIG. 3 is a sectional view of a thrust bearing integrated with a two-position outer ring, showing a thrust bearing. It is a sectional view of a thrust bearing showing a thrust bearing and integrated with a two-position inner ring.
  • FIG. 3 is a cross-sectional view of a thrust bearing showing a thrust bearing and having a washer-shaped bearing ring. It is process drawing which shows the inner periphery bending process of the inner ring
  • FIG. 2 is a cross-sectional view immediately before pressing, showing a pressing device that performs an inner ring forming piercing step. It is sectional drawing after the press work which shows the press apparatus which performs the piercing process of inner ring
  • FIG. 5 is a simplified diagram showing a piercing process of inner ring forming and during press working.
  • FIG. 5 is a simplified diagram showing a piercing process for inner ring forming and after press working. It is a sectional view of the state of a set showing a press device which performs a burring process of inner ring forming.
  • FIG. 2 is a cross-sectional view immediately before pressing showing a pressing device that performs a burring step of inner ring molding. It is sectional drawing after the press work which shows the press apparatus which performs the burring process of inner ring
  • FIG. 1 is a cross-sectional view immediately before pressing showing a pressing device that performs a draw process of outer ring molding. It is sectional drawing after the press work which shows the press apparatus which performs the draw process of outer ring shaping
  • FIG. 6 is a simplified diagram showing a drawing process of outer ring molding and during press working. It is a simplified diagram of a workpiece after press working showing a draw process of outer ring forming.
  • FIG. 5 is a simplified diagram showing a drawing process of outer ring molding after press working.
  • FIG. 1 shows a simplified block diagram of a method for forming a bearing ring for a thrust bearing.
  • the coil material 24 is subjected to a plurality of pressing steps (molding steps) including a polishing step (polishing step), followed by heat treatment, and then a polishing step (polishing step, for example, temper color removal).
  • the temper color is a color generated by tempering. That is, the bearing ring forming method of the present invention performs a surface polishing step on a flat plate-shaped workpiece in a press line having a single or plural types of pressing steps.
  • FIG. 2A shows a three-position integrated thrust bearing
  • FIG. 2B shows a two-position outer ring integrated thrust bearing
  • FIG. 2C shows a two-position inner ring integrated thrust bearing
  • FIG. The ring shows a washer-shaped thrust bearing.
  • the three-way integral type thrust bearing shown in FIG. 2A includes a plurality of raceway rings 11 that constitute an inner ring, a raceway ring 12 that constitutes an outer ring, and rollers that are interposed between the raceway ring 11 and the raceway ring 12.
  • a rolling element 13 and a cage 14 that holds the plurality of rolling elements 13 are provided.
  • the bearing ring 11 constituting the inner ring is composed of a short cylindrical portion 11a and an outer flange portion 11b extending from the one open end to the outer diameter side of the short cylindrical portion 11a.
  • the race 12 constituting the outer ring includes a short cylindrical portion 12a and an inner flange portion 12b extending from the one open end to the inner diameter side of the short cylindrical portion 12a.
  • the cage 14 is formed of a ring body, a plurality of pockets 16 are formed at a predetermined pitch along the circumferential direction, and the rolling elements 13 are held in the pockets 16.
  • a plurality of staking portions 22 and 23 are provided in the short cylindrical portion 11a of the raceway ring 11 and the short cylindrical portion 12a of the raceway ring 12, respectively.
  • the thrust bearing integrated with the second outer ring in FIG. 2B does not have the bearing ring 11 in comparison with the thrust bearing integrated with the third position in FIG. 2A, and includes a bearing ring 12 constituting the outer ring and a plurality of rolling bearings.
  • a moving body 13 and a holder 14 that holds the rolling element 13 are provided.
  • the two-position inner ring integrated thrust bearing in FIG. 2C does not have the bearing ring 12 as compared to the three-position integrated thrust bearing in FIG. 2A, and the bearing ring 12 constituting the outer ring and a plurality of rolling bearings.
  • a moving body 13 and a holder 14 that holds the rolling element 13 are provided.
  • the cage 20 is formed of a ring body, a plurality of pockets 21 are formed at a predetermined pitch along the circumferential direction, and the rolling elements 19 are held in the pockets 21.
  • a blank process 30 for forming a blank material 25 as a workpiece W from the coil material 24 and a hole 25a (FIGS. 4B, 4C, 5A, 5C, and 6) at a predetermined position with respect to the blank material 25 are performed.
  • the molded race 11 see FIGS. 4D and 5D
  • temper color removal as shown in FIG. 1 is performed. Will do.
  • a polishing step (surface polishing step) 33 can be introduced before the blanking step 30 and between the piercing step 31 and the burring step 32 after the blanking step 30.
  • a polishing surface 25 b is formed on the surface of the blank material 25.
  • the flat plate-shaped workpiece W (blank material 25) is polished.
  • surface polishing process 33 even if it is only before blank process 30, or only between piercing process 31 and burring process 32, it is two processes before blank process 30 and between piercing process 31 and burring process 32. There may be.
  • two steps between the blank process 30 and after the blank process 30 and the piercing process 31 may be used.
  • the polishing step (polishing step) 33 includes a method as shown in FIG. 6A shows a wheel polishing process using a wheel 35 whose surface is made of an abrasive cloth or a grindstone, FIG. 6B shows a brush polishing process using a brush 36 made of an abrasive cloth, and FIG. 6C shows a belt made of an abrasive cloth.
  • Fig. 6D shows a brush polishing process using a segment brush 38 having a plurality of grindstones, and
  • Fig. 6E shows a shot process using a shot blasting machine 39 for ejecting media. Yes.
  • the blanking process 30 uses the press apparatus 40 shown in FIG.
  • the press device 40 includes an upper die 41 and a lower die 42.
  • the upper die 41 has a punch 43 and a work presser 44.
  • the work holder 44 is attached to the lower end of a rod 46 that is movable up and down on the substrate 45 of the upper mold 41 and is elastically pressed downward by an elastic member 47.
  • the outer diameter dimension of the punch 43 and the inner diameter dimension of the punch insertion hole 42a of the lower mold 42 are set to be substantially the same.
  • substantially the same means that the punch 43 can be inserted into and removed from the punch insertion hole 42a, and when inserted, there is no gap between the outer diameter surface of the punch 43 and the inner diameter surface of the punch insertion hole 42a.
  • the inner diameter dimension is set larger than the outer diameter dimension of the punch 43, but when the upper die 41 is lowered, as shown in FIG. The presser can be pressed.
  • the coil member 24 as shown in FIG. 8A is set on the work placement surface of the lower die 42 as shown in FIG. 7A.
  • the upper mold 41 is lowered as shown in FIG. 7B.
  • the end of the workpiece is pressed by the workpiece presser 44.
  • the punch 43 is inserted into the punch insertion hole 42a of the lower die 42 as shown in FIGS. 7C and 8D. .
  • the work retainer 44 rises against the elastic force of the elastic member 47 and maintains the state in which the end of the work W (in this case, the coil material 24) is retained by the work retainer 44.
  • the disc-shaped blank 25 can be punched out.
  • a blank residue 48 is sandwiched between the work holder 44 and the work placement surface of the lower mold 42.
  • the piercing process uses a press device 50 shown in FIG.
  • the press device 50 also includes an upper die 51 and a lower die 52.
  • the upper die 51 has a punch 53 and a work presser 54.
  • the work retainer 54 is attached to the lower end of a rod 56 that is movable up and down on the substrate 55 of the upper mold 51, and is elastically pressed downward by an elastic member 57.
  • the outer diameter of the punch 53 and the inner diameter of the punch insertion hole 52a of the lower mold 52 are set to be substantially the same.
  • substantially the same means that the punch 53 can be inserted into and removed from the punch insertion hole 52a, and when inserted, there is no gap between the outer diameter surface of the punch 53 and the inner diameter surface of the punch insertion hole 52a.
  • the inner diameter dimension is set larger than the outer diameter dimension of the punch 43, but when the upper die 51 is lowered, as shown in FIG. 9B and FIG. The end can be pressed.
  • a press working method using the press apparatus shown in FIG. 9 will be described.
  • a blank material 25 as shown in FIGS. 8C and 10A is set on the work placement surface of the lower mold 52 as shown in FIG. 9A.
  • the upper mold 51 is lowered as shown in FIG. 9B.
  • the end of the blank 25 is pressed by the work holder 54.
  • the punch 53 is inserted into the punch insertion hole 52a of the lower die 52 as shown in FIGS. 9C and 10D.
  • the work retainer 54 rises against the elastic force of the elastic member 57 and maintains the state in which the end of the work W (the blank material 25 in this case) is pressed by the work retainer 54.
  • a hole 25a is formed as shown in FIG. 10C.
  • the pierce casks 58 are formed, and the pierce casks 58 enter the punch insertion holes 52 a of the lower mold 52 together with the punch 53.
  • the workpiece W of the present invention is composed of the coil material 24, the blank material 25, and the like.
  • the burring process uses a press device 60 shown in FIG.
  • the press device 60 includes an upper die 61 and a lower die 62.
  • the lower die 62 has a punch 63 and a work presser 64.
  • the work presser 64 is attached to the upper end of a rod 66 that is movable up and down on the substrate 65 of the lower mold 62, and is elastically pressed upward by an elastic member 67.
  • the punch 63 is composed of a columnar main body 63a and a protruding portion 63b that is connected to the upper end of the main body 63a. Further, the outer diameter of the main body 63a is set to be substantially the same as the inner diameter of the work holder 64. Here, substantially the same means that, as shown in FIG. 11, it can be slidably inserted into the through hole of the work retainer 64, and no gap is formed between the outer diameter surface of the main body 63 a and the inner diameter surface of the work retainer 64. To the extent. Further, the inner diameter dimension of the punch insertion hole 61 a of the upper die 61 is set larger than the outer diameter dimension of the main body portion 63 a of the punch 63. In this case, a gap between the inner diameter surface of the punch insertion hole 61 a of the upper die 61 and the outer diameter surface of the main body portion 63 a of the punch 63 is set to be approximately the thickness of the blank material 25.
  • the punch 63 is inserted into the punch insertion hole 61a of the upper die 61 as shown in FIGS. 11C and 12D.
  • the work presser 64 descends against the elastic force of the elastic member 67 and maintains the state where the work presser 64 holds the end of the work W (in this case, the blank material 25).
  • the outer peripheral part of the hole 25a of the blank material 25 can be bent upward, the short cylindrical part 11a can be formed, and the inner ring
  • a staking step (caulking step) is required as shown in FIG.
  • a staking part 22 is formed in the short cylindrical part 11 a of the inner ring 11 so that a part thereof bulges toward the outer diameter side.
  • a leveler process is performed before the blank process, and a deburring process is performed between the piercing process 31 and the burring process 32.
  • the leveler process is a process in which the material (coil material 24) sent from the uncoiler is put into the leveler and corrected.
  • the polishing process is foil processing.
  • the piercing process 31, the burring process 32, and the staking process are comprised with a press machine.
  • FIG. 15 shows a molding process of the race 12 constituting the outer ring.
  • a blank process 30 for forming a blank material 25 (see FIGS. 16A and 17A) from the coil material 24 and a piercing process for making a hole 25a (see FIGS. 16B and 17B) at a predetermined position with respect to the blank material 25.
  • the molded race 12 is subjected to heat treatment, and temper color removal (polishing step) as shown in FIG. 1 is performed.
  • a polishing step (polishing step) 33 can be introduced before the blank step 30 and between the piercing step 31 and the draw step 34 after the blank step 30.
  • a polishing surface 25 b is formed on the surface of the blank material 25.
  • the surface polishing process 33 even before the blank process 30, or only between the piercing process 31 and the draw process 34, two processes before the blank process 30 and between the piercing process 31 and the draw process 34 are performed. There may be.
  • two steps between the blank process 30 and after the blank process 30 and the piercing process 31 may be used.
  • the press process 70 shown in FIG. 18 is used for the drawing process.
  • the press device 70 includes an upper die 71 and a lower die 72.
  • the lower mold 72 has a punch 73 and a work presser 74.
  • the work retainer 74 is attached to the upper end of a rod 76 that is movable up and down on the substrate 75 of the lower mold 72, and is elastically pressed upward by an elastic member 77.
  • the punch 73 is composed of a columnar main body 73a and a protruding portion 73b that is connected to the upper end of the main body 73a.
  • the outer diameter of the main body 73a is set to be substantially the same as the inner diameter of the work retainer 74.
  • it can be slidably inserted into the through hole of the work retainer 74, and there is no gap between the outer diameter surface of the main body 73 a and the inner diameter surface of the work retainer 74. To the extent.
  • a work presser 78 is disposed in the insertion hole 71 a of the upper mold 71 via an elastic member 79.
  • the work retainer 78 is formed of a disk-shaped body, and a concave portion 78a is provided on the lower surface thereof. As shown in FIGS. 18B and 18C, the protruding portion 73b of the punch 73 can be fitted into the concave portion 78a. It has become.
  • the outer diameter dimension of the work retainer 78 and the inner diameter dimension of the fitting hole 71a of the upper die 71 are set to be substantially the same.
  • substantially the same means that the work retainer 78 can be slidably inserted into the insertion hole 71a of the upper mold 71, and a gap is formed between the outer diameter surface of the work retainer 78 and the inner diameter surface of the insertion hole 71a of the upper mold 71. Do not generate.
  • the inner diameter dimension of the recessed portion 78a and the outer diameter dimension of the bulging portion 73b of the punch 73 are set to be substantially the same.
  • the substantially same means that the bulged portion 73b of the punch 73 can be fitted into the recessed portion 78a of the work retainer 78, and the outer diameter surface of the bulged portion 73b of the punch 73 and the inner diameter surface of the recessed portion 78a of the work retainer 78 are It is set so as not to cause a gap between them.
  • the outer diameter dimension of the work retainer 78 is set larger than the outer diameter dimension of the main body 73 a of the punch 73. That is, the gap between the inner diameter surface of the fitting hole 71 a of the upper die 71 and the outer diameter surface of the main body portion 73 a of the punch 73 is set to be approximately the thickness of the blank material 25.
  • the blank 25 (see FIGS. 16B, 17B, and 19A) in which the holes 25a are formed is set on the work placement surface of the lower die 72 as shown in FIG. 18A.
  • the bulging portion 73 b of the punch 73 is fitted into the hole 25 a of the blank material 25, and the blank material 25 is placed on the upper surface of the main body portion 73 a of the punch 73. That is, the upper surface of the work holder 74 and the upper surface of the main body 73a of the punch 73 are disposed on the same surface.
  • the upper mold 71 is lowered as shown in FIGS. 18B and 19B. That is, the blank material 25 is sandwiched between the work retainer 78 and the upper die 71, and the upper surface of the main body 73 a of the punch 73 and the upper surface of the work retainer 74.
  • the upper die 71 is further lowered from the state shown in FIGS. 18B and 19B.
  • the outer peripheral portion of the blank member 25 is bent downward to form the short cylindrical portion 12a and the outer ring 12 is formed.
  • the heat treatment and the post-process are performed in the same manner as the molding method of the inner ring 11 in FIG. For this reason, the polishing surface 25b is formed as shown in FIGS. 16C and 17C.
  • the staking part 23 is provided like the outer ring
  • FIG. 20 shows a molding process of the washer-shaped race rings 17 and 18.
  • a blank process 30 for forming a blank material 25 (see FIGS. 21A and 22A) from the coil material 24 and a piercing process for making a hole 25a (see FIGS. 21B and 22B) at a predetermined position with respect to the blank material 25. 31.
  • a polishing step (polishing step) 33 can be introduced before the blanking step 30, before the piercing step 31 after the blanking step 30, and after the piercing step 31.
  • the polishing surface 80 is formed as shown in FIGS. 21C and 22C.
  • the surface polishing process 33 even before the blank process 30, only before the piercing process 31 after the blank process 30, and only after the piercing process 32, the piercing process before the blank process 30 and after the blank process 30. It may be any two steps before 31 and after piercing step 31, or all three steps. In the process of forming the washer-shaped races 17 and 18, there is no need to provide a burring process or a drawing process.
  • the workpiece W has a flat plate shape during the surface polishing step, the entire workpiece surface can be uniformly and rapidly polished. That is, even if the coil material 24 (for example, Ra 3 ⁇ m or less) having a rough material is used, polishing can be performed in a short time (for example, several seconds). Moreover, it becomes possible to form without having an intermediate stock by putting a polishing process between the press lines and making it into a line. For this reason, cost reduction and productivity improvement can be aimed at.
  • the coil material 24 for example, Ra 3 ⁇ m or less
  • the bearing ring to be molded may be a bearing inner ring, a bearing outer ring, a washer-shaped inner ring or an outer ring.
  • the polishing process includes wheel polishing, brush polishing, belt polishing, and shot processing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

In a pressing line comprising a single or multiple kinds of pressing steps, a surface-polishing step is performed on flat workpieces. The bearing ring-forming method comprises a blanking step as a pressing step and has the surface-polishing step before the blanking step.

Description

軌道輪成形方法Bearing ring forming method
　本発明は、軌道輪成形方法に関し、特に、スラスト軸受の軌道輪を成形する方法に関する。 The present invention relates to a bearing ring forming method, and more particularly to a method for forming a bearing ring of a thrust bearing.
　従来のスラスト軸受の軌道輪に対するプレス生産ラインの構成は、一般には、コイル材（Ｒｚ１．５μｍ以下、Ｒａ０．２μｍ程度）からトランスファープレスにより、ワッシャー形状または、ワッシャーの外周または内周を曲げ加工した形状に加工するものである。その後に、製品精度として必要な面粗さまで、図２３に示すように仕上げ加工（バレル加工等）が必要であった。 The structure of a press production line for a conventional thrust bearing raceway is generally formed by bending a washer shape or the outer periphery or inner periphery of a washer from a coil material (Rz 1.5 μm or less, about Ra 0.2 μm) by a transfer press. It is processed into a shape. After that, finish processing (barrel processing or the like) was required as shown in FIG. 23 to the surface roughness required for product accuracy.
　バレル加工（バレル研磨）は、図２３に示すように、バレル１とよばれる研磨槽内にワーク２とバレルメディア３を投入し、それらの相互摩擦作用させる研磨加工技術である。スラスト軸受の軌道輪に対して、このようなバレル加工の仕上げを行うことは特許文献１に記載されている。また、仕上げとして、ブラスト処理を行うものもある（特許文献２）。 Barrel processing (barrel polishing) is a polishing processing technique in which a workpiece 2 and a barrel media 3 are placed in a polishing tank called a barrel 1 and interact with each other as shown in FIG. It is described in Patent Document 1 that such barrel finishing is performed on the bearing ring of the thrust bearing. In addition, there is a technique that performs blasting as a finish (Patent Document 2).
　すなわち、スラスト軸受の軌道輪等は、図２４に示すように、コイル材からブランク工程、ピアス工程、及びバーリング工程等の成形工程を行った後、熱処理工程を行い、次に、仕上げとして、磨き加工（例えば、バレル加工）を行うことになる。すなわち、成形工程からバレル工程までのバッチ処理を行うことになる。 That is, as shown in FIG. 24, the bearing ring of the thrust bearing is subjected to a heat treatment process after a molding process such as a blank process, a piercing process, and a burring process from the coil material, and then polished as a finish. Processing (for example, barrel processing) is performed. That is, batch processing from the molding process to the barrel process is performed.
特開２００３－１７２３４６号公報JP 2003-172346 A 特開２００７－７８１１４号公報JP 2007-78114 A
　従来の製造法では、成形した複雑な形状のワークの面粗さを改善させる必要があるため、処理時間が数時間と長く、図２４に示すように、バッチ処理を行う必要があった。それにより、中間在庫を持つ必要があり、前後工程とのライン化もできなかった。 In the conventional manufacturing method, since it is necessary to improve the surface roughness of the molded workpiece having a complicated shape, the processing time is as long as several hours, and it is necessary to perform batch processing as shown in FIG. As a result, it was necessary to have an intermediate stock, and it was not possible to make a line with the preceding and following processes.
　そこで、本発明では、材料表面粗さに依存することなく軌道輪の成形が可能であり、ライン化することにより中間在庫の削減が可能である軌道輪成形方法を提供する。 Therefore, the present invention provides a bearing ring forming method that can form a bearing ring without depending on the surface roughness of the material, and can reduce intermediate stock by forming a line.
　本発明のスラスト軸受用の軌道輪成形方法は、複数種のプレス工程を有するプレスライン内において、平板形状のワークに対して表面研磨工程を行うものである。 The method for forming a bearing ring for a thrust bearing according to the present invention performs a surface polishing process on a plate-shaped workpiece in a press line having a plurality of types of pressing processes.
　本発明のスラスト軸受用の軌道輪成形方法によれば、表面研磨工程の際には、ワークが平板形状であるので、ワーク表面全体を均一かつ高速に研磨加工することができる。 According to the bearing ring forming method for a thrust bearing of the present invention, since the workpiece has a flat plate shape in the surface polishing step, the entire workpiece surface can be polished uniformly and at high speed.
　プレス工程としてブランク工程を有し、このブランク工程前に前記表面研磨工程を有するのもであったり、プレス工程としてピアス工程を有し、このピアス工程前に前記表面研磨工程を有するものであったり、プレス工程としてバーリング工程又はドロー工程を有し、バーリング工程又はドロー工程前に前記表面研磨工程を有するものであったりする。 It has a blank process as a pressing process and has the surface polishing process before the blank process, or has a piercing process as the pressing process and has the surface polishing process before the piercing process. The burring process or the drawing process may be included as the pressing process, and the surface polishing process may be performed before the burring process or the drawing process.
　成形する軌道輪が内輪であったり、成形する軌道輪が外輪であったり、成形する軌道輪がワッシャー形状の内輪であったり、成形する軌道輪がワッシャー形状の外輪であったりする。 The bearing ring to be molded is an inner ring, the bearing ring to be molded is an outer ring, the bearing ring to be molded is a washer-shaped inner ring, or the bearing ring to be molded is a washer-shaped outer ring.
　前記表面研磨工程が、ホイール研磨加工、ブラシ研磨加工、ベルト研磨加工、及びショット加工の少なくともいずれか一つ工程を含むものとすることができる。 The surface polishing step may include at least one of wheel polishing, brush polishing, belt polishing, and shot processing.
　本発明では、ワーク表面全体を均一かつ高速に研磨加工することができる。すなわち、素材粗さが粗いコイル材(例えば、Ｒａ３μｍ以下)を使用しても、短時間（例えば、数秒）で研磨加工ができる。また、研磨工程をプレスラインの間に入れることによって、ライン化することができて、中間在庫を持つことなく成形できるようになる。このため、低コスト化及び生産性の向上を図ることができる。 In the present invention, the entire workpiece surface can be polished uniformly and at high speed. That is, even when a coil material having a rough material roughness (for example, Ra 3 μm or less) is used, polishing can be performed in a short time (for example, several seconds). Further, by putting the polishing process between the press lines, it is possible to form a line without having an intermediate stock. For this reason, cost reduction and productivity improvement can be aimed at.
本発明のスラスト軸受の軌道輪成形方法の簡略ブロック図である。It is a simplified block diagram of the bearing ring forming method of the thrust bearing of the present invention. スラスト軸受を示し、三位一体型のスラスト軸受の断面図である。FIG. 3 is a sectional view of a three-way integral thrust bearing, showing a thrust bearing. スラスト軸受を示し、二位外輪一体型のスラスト軸受の断面図である。FIG. 3 is a sectional view of a thrust bearing integrated with a two-position outer ring, showing a thrust bearing. スラスト軸受を示し、二位内輪一体型のスラスト軸受の断面図である。It is a sectional view of a thrust bearing showing a thrust bearing and integrated with a two-position inner ring. スラスト軸受を示し、軌道輪がワッシャー形状のスラスト軸受の断面図である。FIG. 3 is a cross-sectional view of a thrust bearing showing a thrust bearing and having a washer-shaped bearing ring. スラスト軸受の内輪の内周曲げ加工を示す工程図である。It is process drawing which shows the inner periphery bending process of the inner ring | wheel of a thrust bearing. 内輪の成形工程を示し、ブランク工程後のワークの平面図である。It is a top view of the workpiece | work after the blank process which shows the formation process of an inner ring | wheel. 内輪の成形工程を示し、ピアス工程後のワークの平面図である。It is a top view of the workpiece | work after the piercing process which shows the formation process of an inner ring | wheel. 内輪の成形工程を示し、みがき（研磨工程）後のワークの平面図である。It is a top view of the workpiece | work after a grinding | polishing (polishing process) which shows the formation process of an inner ring | wheel. 内輪の成形工程を示し、成形工程後のワークの平面図である。It is a top view of the workpiece | work after the formation process which shows the formation process of an inner ring | wheel. 内輪の成形工程を示し、ブランク工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the blank process which shows the formation process of an inner ring | wheel. 内輪の成形工程を示し、ピアス工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the piercing process which shows the formation process of an inner ring | wheel. 内輪の成形工程を示し、みがき（研磨工程）後のワークの断面図である。It is sectional drawing of the workpiece | work after a grinding | polishing (polishing process) which shows the formation process of an inner ring | wheel. 内輪の成形工程を示し、成形工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the formation process which shows the formation process of an inner ring | wheel. 研磨工程を示し、ホイールを用いた研磨工程の簡略図である。It is a simplified diagram showing a polishing process and using a wheel. 研磨工程を示し、ブラシを用いた研磨工程の簡略図である。It is a simplified diagram showing a polishing process and a polishing process using a brush. 研磨工程を示し、ベルトを用いた研磨工程の簡略図である。It is a simplified diagram of a polishing process using a belt, showing a polishing process. 研磨工程を示し、セグメントブラシを用いた研磨工程の簡略図である。It is a simplified diagram showing a polishing process and a polishing process using a segment brush. 研磨工程を示し、ショットブラストを用いた研磨工程の簡略図である。It is a simplified diagram showing a polishing process and a polishing process using shot blasting. 内輪成形のブランク工程を行うプレス装置を示し、セットの状態の断面図である。It is sectional drawing of the state of the set state which shows the press apparatus which performs the blank process of an inner ring shaping | molding. 内輪成形のブランク工程を行うプレス装置を示し、プレス直前の断面図である。It is a sectional view just before a press showing a press device which performs a blank process of inner ring forming. 内輪成形のブランク工程を行うプレス装置を示し、プレス加工後の断面図である。It is sectional drawing after the press work which shows the press apparatus which performs the blank process of an inner ring | wheel shaping | molding. 内輪成形のブランク工程を示し、コイル材の簡略図である。It is a simplified diagram of a coil material showing a blank process of inner ring forming. 内輪成形のブランク工程を示し、ブランク加工直前のワークの簡略図である。It is a simplified diagram of the workpiece | work just before blank processing which shows the blank process of inner ring | wheel shaping | molding. 内輪成形のブランク工程を示し、ブランク加工後のワークの簡略図である。It is a simplified diagram of a work after showing a blank process of inner ring forming and blanking. 内輪成形のブランク工程を示し、ブランク工程中の簡略図である。It is a simplified diagram in the blank process, showing a blank process of inner ring molding. 内輪成形のピアス工程を行うプレス装置を示し、セットの状態の断面図である。It is sectional drawing of the state of the set state which shows the press apparatus which performs the piercing process of inner ring shaping | molding. 内輪成形のピアス工程を行うプレス装置を示し、プレス直前の断面図である。FIG. 2 is a cross-sectional view immediately before pressing, showing a pressing device that performs an inner ring forming piercing step. 内輪成形のピアス工程を行うプレス装置を示し、プレス加工後の断面図である。It is sectional drawing after the press work which shows the press apparatus which performs the piercing process of inner ring | wheel shaping | molding. 内輪成形のピアス工程を示し、ピアス工程前のワークの簡略図である。It is a simplified diagram of a workpiece before the piercing process, showing the piercing process of inner ring forming. 内輪成形のピアス工程を示し、プレス加工中の簡略図である。FIG. 5 is a simplified diagram showing a piercing process of inner ring forming and during press working. 内輪成形のピアス工程を示し、プレス加工後のワークの簡略図である。It is a simplified diagram of a workpiece after press working, showing the piercing process of inner ring forming. 内輪成形のピアス工程を示し、プレス加工後の簡略図である。FIG. 5 is a simplified diagram showing a piercing process for inner ring forming and after press working. 内輪成形のバーリング工程を行うプレス装置を示し、セットの状態の断面図である。It is a sectional view of the state of a set showing a press device which performs a burring process of inner ring forming. 内輪成形のバーリング工程を行うプレス装置を示し、プレス直前の断面図である。FIG. 2 is a cross-sectional view immediately before pressing showing a pressing device that performs a burring step of inner ring molding. 内輪成形のバーリング工程を行うプレス装置を示し、プレス加工後の断面図である。It is sectional drawing after the press work which shows the press apparatus which performs the burring process of inner ring | wheel shaping | molding. 内輪成形のバーリング工程を示し、バーリング工程前のワークの簡略図である。It is a simplified diagram of the workpiece before the burring process, showing the burring process of inner ring forming. 内輪成形のバーリング工程を示し、プレス加工中の簡略図である。It is a simplified diagram showing a burring process of inner ring forming and during press working. 内輪成形のバーリング工程を示し、プレス加工後のワークの簡略図である。It is a simplified diagram of a work after press working, showing a burring process of inner ring forming. 内輪成形のバーリング工程を示し、プレス加工後の簡略図である。It is a simplified diagram showing a burring process of inner ring forming and after press working. プレスラインの各工程の説明図である。It is explanatory drawing of each process of a press line. ステーキング形状のイメージ図である。It is an image figure of a staking shape. スラスト軸受の外輪の外周曲げ加工の工程図である。It is process drawing of the outer periphery bending process of the outer ring | wheel of a thrust bearing. 外輪の成形工程を示し、ブランク工程後のワークの平面図である。It is a top view of the workpiece | work after the blank process which shows the formation process of an outer ring | wheel. 外輪の成形工程を示し、ピアス工程後のワークの平面図である。It is a top view of the workpiece | work after the piercing process which shows the formation process of an outer ring | wheel. 外輪の成形工程を示し、みがき（研磨工程）後のワークの平面図である。It is a top view of the workpiece | work after a grinding | polishing (polishing process) which shows the formation process of an outer ring | wheel. 外輪の成形工程を示し、成形工程後のワークの平面図である。It is a top view of the workpiece | work after the formation process which shows the formation process of an outer ring | wheel. 外輪の成形工程を示し、ブランク工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the blank process which shows the formation process of an outer ring | wheel. 外輪の成形工程を示し、ピアス工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the piercing process which shows the formation process of an outer ring | wheel. 外輪の成形工程を示し、みがき（研磨工程）後のワークの断面図である。It is sectional drawing of the workpiece | work after a grinding | polishing (polishing process) which shows the formation process of an outer ring | wheel. 外輪の成形工程を示し、成形工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the formation process which shows the formation process of an outer ring | wheel. 外輪成形のドロー工程を行うプレス装置を示し、セットの状態の断面図である。It is sectional drawing of the state of the set state which shows the press apparatus which performs the draw process of outer ring shaping | molding. 外輪成形のドロー工程を行うプレス装置を示し、プレス直前の断面図である。1 is a cross-sectional view immediately before pressing showing a pressing device that performs a draw process of outer ring molding. 外輪成形のドロー工程を行うプレス装置を示し、プレス加工後の断面図である。It is sectional drawing after the press work which shows the press apparatus which performs the draw process of outer ring shaping | molding. 外輪成形のドロー工程を示し、ドロー工程前のワークの簡略図である。It is a simplified diagram of a work before a draw process, showing a draw process of outer ring forming. 外輪成形のドロー工程を示し、プレス加工中の簡略図である。FIG. 6 is a simplified diagram showing a drawing process of outer ring molding and during press working. 外輪成形のドロー工程を示し、プレス加工後のワークの簡略図である。It is a simplified diagram of a workpiece after press working showing a draw process of outer ring forming. 外輪成形のドロー工程を示し、プレス加工後の簡略図である。FIG. 5 is a simplified diagram showing a drawing process of outer ring molding after press working. スラスト軸受の内輪又は外輪のワッシャー形状加工を示す工程図である。It is process drawing which shows the washer shape process of the inner ring | wheel or outer ring | wheel of a thrust bearing. ワッシャーのプレス工程を示し、ブランク工程後のワークの平面図である。It is a top view of the workpiece | work after the blank process which shows the press process of a washer. ワッシャーのプレス工程を示し、ピアス工程後のワークの平面図である。It is a top view of the workpiece | work after the piercing process which shows the press process of a washer. ワッシャーのプレス工程を示し、みがき（研磨工程）後のワークの平面図である。It is a top view of a work after showing a press process of a washer and polishing (polishing process). ワッシャーのプレス工程を示し、ブランク工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the blank process which shows the press process of a washer. ワッシャーのプレス工程を示し、ピアス工程後のワークの断面図である。It is sectional drawing of the workpiece | work after the piercing process which shows the press process of a washer. ワッシャーのプレス工程を示し、みがき（研磨工程）後のワークの断面図である。It is sectional drawing of the workpiece | work after polishing (polishing process) which shows the press process of a washer. バレル加工の説明図である。It is explanatory drawing of barrel processing. 従来のスラスト軸受の軌道輪成形方法の簡略ブロック図である。It is a simplified block diagram of the conventional bearing ring forming method of a thrust bearing.
　以下本発明の実施の形態を図１～図２２に基づいて説明する。図１はスラスト軸受の軌道輪成形方法の簡略ブロック図を示す。この図１では、コイル材２４を、みがき工程（研磨工程）を含む複数のプレス工程（成形工程）を行った後、熱処理を行い、次にみがき工程（研磨工程、例えば、テンパーカラー取り）を行うものである。なお、テンパーカラーとは、焼き戻しで発生する色のことである。すなわち、本発明の軌道輪成形方法は、単一または複数種のプレス工程を有するプレスライン内において、平板形状のワークに対して表面研磨工程を行うものである。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a simplified block diagram of a method for forming a bearing ring for a thrust bearing. In FIG. 1, the coil material 24 is subjected to a plurality of pressing steps (molding steps) including a polishing step (polishing step), followed by heat treatment, and then a polishing step (polishing step, for example, temper color removal). Is what you do. The temper color is a color generated by tempering. That is, the bearing ring forming method of the present invention performs a surface polishing step on a flat plate-shaped workpiece in a press line having a single or plural types of pressing steps.
　ところで、スラスト軸受としては、図２Ａは三位一体型のスラスト軸受を示し、図２Ｂは二位外輪一体型のスラスト軸受を示し、図２Ｃは二位内輪一体型のスラスト軸受を示し、図２Ｃは軌道輪がワッシャー形状のスラスト軸受を示している。 As a thrust bearing, FIG. 2A shows a three-position integrated thrust bearing, FIG. 2B shows a two-position outer ring integrated thrust bearing, FIG. 2C shows a two-position inner ring integrated thrust bearing, and FIG. The ring shows a washer-shaped thrust bearing.
　すなわち、図２Ａに示す三位一体型のスラスト軸受は、内輪を構成する軌道輪１１と、外輪を構成する軌道輪１２と、軌道輪１１と軌道輪１２との間に介在されるころからなる複数の転動体１３と、この複数の転動体１３を保持する保持器１４とを備える。 That is, the three-way integral type thrust bearing shown in FIG. 2A includes a plurality of raceway rings 11 that constitute an inner ring, a raceway ring 12 that constitutes an outer ring, and rollers that are interposed between the raceway ring 11 and the raceway ring 12. A rolling element 13 and a cage 14 that holds the plurality of rolling elements 13 are provided.
　内輪を構成する軌道輪１１は、短円筒部１１ａと、この短円筒部１１ａに一方の開口端部から外径側に延びる外鍔部１１ｂとからなる。また、外輪を構成する軌道輪１２は、短円筒部１２ａと、この短円筒部１２ａに一方の開口端部から内径側に延びる内鍔部１２ｂとからなる。保持器１４は、リング体からなり、周方向に沿って所定ピッチで複数個のポケット１６が形成され、各ポケット１６に転動体１３が保持されている。この図２Ａに示すスラスト軸受では、軌道輪１１の短円筒部１１ａ及び軌道輪１２の短円筒部１２ａには、それぞれ、複数個のステーキング部２２，２３を設けている。 The bearing ring 11 constituting the inner ring is composed of a short cylindrical portion 11a and an outer flange portion 11b extending from the one open end to the outer diameter side of the short cylindrical portion 11a. The race 12 constituting the outer ring includes a short cylindrical portion 12a and an inner flange portion 12b extending from the one open end to the inner diameter side of the short cylindrical portion 12a. The cage 14 is formed of a ring body, a plurality of pockets 16 are formed at a predetermined pitch along the circumferential direction, and the rolling elements 13 are held in the pockets 16. In the thrust bearing shown in FIG. 2A, a plurality of staking portions 22 and 23 are provided in the short cylindrical portion 11a of the raceway ring 11 and the short cylindrical portion 12a of the raceway ring 12, respectively.
　図２Ｂの二位外輪一体型のスラスト軸受は、前記図２Ａの三位一体型のスラスト軸受に対して、軌道輪１１を有さないものであり、外輪を構成する軌道輪１２と、複数個の転動体１３と、この転動体１３を保持する保持器１４とを備える。図２Ｃの二位内輪一体型のスラスト軸受は、前記図２Ａの三位一体型のスラスト軸受に対して、軌道輪１２を有さないものであり、外輪を構成する軌道輪１２と、複数個の転動体１３と、この転動体１３を保持する保持器１４とを備える。 The thrust bearing integrated with the second outer ring in FIG. 2B does not have the bearing ring 11 in comparison with the thrust bearing integrated with the third position in FIG. 2A, and includes a bearing ring 12 constituting the outer ring and a plurality of rolling bearings. A moving body 13 and a holder 14 that holds the rolling element 13 are provided. The two-position inner ring integrated thrust bearing in FIG. 2C does not have the bearing ring 12 as compared to the three-position integrated thrust bearing in FIG. 2A, and the bearing ring 12 constituting the outer ring and a plurality of rolling bearings. A moving body 13 and a holder 14 that holds the rolling element 13 are provided.
　図２Ｅに示すスラスト軸受では、貫孔１７ａ、１８ａを有するワッシャ形状（平板リング体）の一対の軌道輪１７，１８と、この軌道輪１７，１８間に介在される複数個の転動体１９と、この転動体１９を保持する保持器２０とを備える。この場合、保持器２０は、リング体からなり、周方向に沿って所定ピッチで複数個のポケット２１が形成され、各ポケット２１に転動体１９が保持されている。 In the thrust bearing shown in FIG. 2E, a pair of washer-shaped (flat plate ring) bearing rings 17 and 18 having through holes 17a and 18a, and a plurality of rolling elements 19 interposed between the bearing rings 17 and 18; And a holder 20 for holding the rolling element 19. In this case, the cage 20 is formed of a ring body, a plurality of pockets 21 are formed at a predetermined pitch along the circumferential direction, and the rolling elements 19 are held in the pockets 21.
　ところで、前記軌道輪１１を成形する場合、図３に示すように、複数のプレス加工を経ることになる。プレス加工として、コイル材２４からワークＷとしてのブランク材２５を形成するブランク工程３０と、ブランク材２５に対して所定位置に穴２５ａ（図４Ｂ、図４Ｃ、図５Ａ、図５Ｃ、及び図６参照）をあけるピアス工程３１と、ピアス工程３１にてピアス加工を施されたブランク材２５にバーリング加工（突起を作る）を行うバーリング工程３２とを備える。なお、図３では、バーリング工程３２終了後に、成形された軌道輪１１(図４Ｄ及び図５Ｄ参照)に対して、熱処理を行って、図１に示すような、テンパーカラー取り（みがき工程）を行うことになる。 By the way, when the raceway 11 is formed, as shown in FIG. As the press work, a blank process 30 for forming a blank material 25 as a workpiece W from the coil material 24 and a hole 25a (FIGS. 4B, 4C, 5A, 5C, and 6) at a predetermined position with respect to the blank material 25 are performed. A piercing step 31 for opening a reference) and a burring step 32 for performing burring (making projections) on the blank material 25 pierced in the piercing step 31. In FIG. 3, after the burring step 32, the molded race 11 (see FIGS. 4D and 5D) is subjected to heat treatment, and temper color removal (polishing step) as shown in FIG. 1 is performed. Will do.
　この際、ブランク工程３０前、及び、ブランク工程３０後のピアス工程３１とバーリング工程３２間において、磨き工程（表面研磨工程）３３を導入することができる。図４Ｃ及び図５Ｃに示すように、ブランク材２５表面に研磨面２５ｂを形成している。この表面研磨工程３３は、平板形状のワークＷ（ブランク材２５）を研磨することになる。なお、表面研磨工程３３としては、ブランク工程３０前のみであっても、ピアス工程３１とバーリング工程３２間のみであっても、ブランク工程３０前及びピアス工程３１とバーリング工程３２間の２工程であってもよい。また、ブランク工程３０前及びブランク工程３０後とピアス工程３１間の２工程であってもよい。 At this time, a polishing step (surface polishing step) 33 can be introduced before the blanking step 30 and between the piercing step 31 and the burring step 32 after the blanking step 30. As shown in FIGS. 4C and 5C, a polishing surface 25 b is formed on the surface of the blank material 25. In the surface polishing step 33, the flat plate-shaped workpiece W (blank material 25) is polished. In addition, as surface polishing process 33, even if it is only before blank process 30, or only between piercing process 31 and burring process 32, it is two processes before blank process 30 and between piercing process 31 and burring process 32. There may be. Moreover, two steps between the blank process 30 and after the blank process 30 and the piercing process 31 may be used.
　磨き工程（研磨工程）３３には図６に示すような方法がある。図６Ａは表面が研磨布または砥石で構成されたホイール３５を用いたホイール研磨加工を示し、図６Ｂは研磨布からなるブラシ３６を用いたブラシ研磨加工を示し、図６Ｃは研磨布からなるベルト３７を用いたベルト研磨加工を示し、図６Ｄは複数個の砥石を有するセグメントブラシ３８を用いたブラシ研磨加工を示し、図６Ｅはメディアを噴射するショットブラスト機３９を用いたショット加工を示している。 The polishing step (polishing step) 33 includes a method as shown in FIG. 6A shows a wheel polishing process using a wheel 35 whose surface is made of an abrasive cloth or a grindstone, FIG. 6B shows a brush polishing process using a brush 36 made of an abrasive cloth, and FIG. 6C shows a belt made of an abrasive cloth. Fig. 6D shows a brush polishing process using a segment brush 38 having a plurality of grindstones, and Fig. 6E shows a shot process using a shot blasting machine 39 for ejecting media. Yes.
　ブランク工程３０は図７に示すプレス装置４０を用いる。プレス装置４０は、上型４１と下型４２とを備える。上型４１はパンチ４３とワーク押え４４とを有する。ワーク押え４４は、上型４１の基板４５に上下動自在なロッド４６の下端に付設され、弾性部材４７にて、弾性的に下方へ押圧されている。 The blanking process 30 uses the press apparatus 40 shown in FIG. The press device 40 includes an upper die 41 and a lower die 42. The upper die 41 has a punch 43 and a work presser 44. The work holder 44 is attached to the lower end of a rod 46 that is movable up and down on the substrate 45 of the upper mold 41 and is elastically pressed downward by an elastic member 47.
　パンチ４３の外径寸法と下型４２のパンチ嵌入孔４２ａの内径寸法とを略同一に設定している。ここで、略同一とは、パンチ４３のパンチ嵌入孔４２ａへの嵌脱が可能で、嵌入された際に、パンチ４３の外径面とパンチ嵌入孔４２ａの内径面との間に隙間が生じない程度とする。また、ワーク押え４４としては、その内径寸法をパンチ４３の外径寸法よりも大きく設定しているが、上型４１が下降した際に、図７Ｂに示すように、コイル材２４の端部の押えが可能とする。 The outer diameter dimension of the punch 43 and the inner diameter dimension of the punch insertion hole 42a of the lower mold 42 are set to be substantially the same. Here, “substantially the same” means that the punch 43 can be inserted into and removed from the punch insertion hole 42a, and when inserted, there is no gap between the outer diameter surface of the punch 43 and the inner diameter surface of the punch insertion hole 42a. To the extent. Moreover, as the work clamp 44, the inner diameter dimension is set larger than the outer diameter dimension of the punch 43, but when the upper die 41 is lowered, as shown in FIG. The presser can be pressed.
　次に、この図７に示すプレス装置４０にてプレス加工方法を説明する。まず、図８Ａに示すようなコイル材２４を図７Ａに示すように、下型４２のワーク載置面にセットする。この状態で、図７Ｂに示すように、上型４１を下降させる。これによって、ワーク押え４４にてワーク（コイル材２４）の端部を押えた状態とする。この図７Ｂ及び図８Ｂに示す状態からさらに上型４１（パンチ４３）を下降させることによって、図７Ｃ及び図８Ｄに示すように、パンチ４３が下型４２のパンチ嵌入孔４２ａに嵌入していく。この際、ワーク押え４４は、弾性部材４７の弾性力に抗して上昇し、ワーク押え４４にてワークＷ（この場合はコイル材２４である）の端部を押えた状態を維持する。これによって、図８Ｃに示すように、円盤状のブランク材２５を打ち抜くことができる。この際、ワーク押え４４と下型４２のワーク載置面との間にブランクカス４８が挟持されている。 Next, a press working method will be described with the press device 40 shown in FIG. First, the coil member 24 as shown in FIG. 8A is set on the work placement surface of the lower die 42 as shown in FIG. 7A. In this state, the upper mold 41 is lowered as shown in FIG. 7B. As a result, the end of the workpiece (coil material 24) is pressed by the workpiece presser 44. By further lowering the upper die 41 (punch 43) from the state shown in FIGS. 7B and 8B, the punch 43 is inserted into the punch insertion hole 42a of the lower die 42 as shown in FIGS. 7C and 8D. . At this time, the work retainer 44 rises against the elastic force of the elastic member 47 and maintains the state in which the end of the work W (in this case, the coil material 24) is retained by the work retainer 44. As a result, as shown in FIG. 8C, the disc-shaped blank 25 can be punched out. At this time, a blank residue 48 is sandwiched between the work holder 44 and the work placement surface of the lower mold 42.
　ピアス工程は図９に示すプレス装置５０を用いる。プレス装置５０も、上型５１と下型５２とを備える。上型５１はパンチ５３とワーク押え５４とを有する。ワーク押え５４は、上型５１の基板５５に上下動自在なロッド５６の下端に付設され、弾性部材５７にて、弾性的に下方へ押圧されている。 The piercing process uses a press device 50 shown in FIG. The press device 50 also includes an upper die 51 and a lower die 52. The upper die 51 has a punch 53 and a work presser 54. The work retainer 54 is attached to the lower end of a rod 56 that is movable up and down on the substrate 55 of the upper mold 51, and is elastically pressed downward by an elastic member 57.
　パンチ５３の外径寸法と下型５２のパンチ嵌入孔５２ａの内径寸法とを略同一に設定している。ここで、略同一とは、パンチ５３のパンチ嵌入孔５２ａへの嵌脱が可能で、嵌入された際に、パンチ５３の外径面とパンチ嵌入孔５２ａの内径面との間に隙間が生じない程度とする。また、ワーク押え５４としては、その内径寸法をパンチ４３の外径寸法よりも大きく設定しているが、上型５１が下降した際に、図９Ｂ及び図１０Ｂに示すように、ブランク材２５の端部の押えが可能となる。 The outer diameter of the punch 53 and the inner diameter of the punch insertion hole 52a of the lower mold 52 are set to be substantially the same. Here, “substantially the same” means that the punch 53 can be inserted into and removed from the punch insertion hole 52a, and when inserted, there is no gap between the outer diameter surface of the punch 53 and the inner diameter surface of the punch insertion hole 52a. To the extent. Further, as the work retainer 54, the inner diameter dimension is set larger than the outer diameter dimension of the punch 43, but when the upper die 51 is lowered, as shown in FIG. 9B and FIG. The end can be pressed.
　次に、この図９に示すプレス装置を用いたプレス加工方法を説明する。まず、図８Ｃ及び図１０Ａに示すようなブランク材２５を図９Ａに示すように、下型５２のワーク載置面にセットする。この状態で、図９Ｂに示すように、上型５１を下降させる。これにワーク押え５４にてブランク材２５の端部を押えた状態とする。この図９Ｂに示す状態からさらに上型５１（パンチ４３）を下降させることによって、図９Ｃ及び図１０Ｄに示すように、パンチ５３が下型５２のパンチ嵌入孔５２ａに嵌入していく。この際、ワーク押え５４は、弾性部材５７の弾性力に抗して上昇し、ワーク押え５４にてワークＷ（この場合はブランク材２５である）の端部を押えた状態を維持する。これによって、図１０Ｃに示すように孔部２５ａが形成される。この場合、ピアスカス５８が形成され、このピアスカス５８が下型５２のパンチ嵌入孔５２ａにパンチ５３とともに侵入していく。このため、本発明のワークＷとしては、コイル材２４及びブランク材２５等で構成することになる Next, a press working method using the press apparatus shown in FIG. 9 will be described. First, a blank material 25 as shown in FIGS. 8C and 10A is set on the work placement surface of the lower mold 52 as shown in FIG. 9A. In this state, the upper mold 51 is lowered as shown in FIG. 9B. In this state, the end of the blank 25 is pressed by the work holder 54. By further lowering the upper die 51 (punch 43) from the state shown in FIG. 9B, the punch 53 is inserted into the punch insertion hole 52a of the lower die 52 as shown in FIGS. 9C and 10D. At this time, the work retainer 54 rises against the elastic force of the elastic member 57 and maintains the state in which the end of the work W (the blank material 25 in this case) is pressed by the work retainer 54. As a result, a hole 25a is formed as shown in FIG. 10C. In this case, the pierce casks 58 are formed, and the pierce casks 58 enter the punch insertion holes 52 a of the lower mold 52 together with the punch 53. For this reason, the workpiece W of the present invention is composed of the coil material 24, the blank material 25, and the like.
　バーリング工程は図１１に示すプレス装置６０を用いる。プレス装置６０は、上型６１と下型６２とを備える。下型６２にはパンチ６３とワーク押え６４とを有する。ワーク押え６４は、下型６２の基板６５に上下動自在なロッド６６の上端に付設され、弾性部材６７にて、弾性的に上方へ押圧されている。 The burring process uses a press device 60 shown in FIG. The press device 60 includes an upper die 61 and a lower die 62. The lower die 62 has a punch 63 and a work presser 64. The work presser 64 is attached to the upper end of a rod 66 that is movable up and down on the substrate 65 of the lower mold 62, and is elastically pressed upward by an elastic member 67.
　パンチ６３は、円柱状の本体部６３ａと、この本体部６３ａの上端に連設される突隆部６３ｂとからなる。また、本体部６３ａの外径寸法は、ワーク押え６４の内径寸法と略同一に設定される。ここで、略同一とは、図１１に示すように、ワーク押え６４の貫通孔にスライド自在に嵌入でき、本体部６３ａの外径面とワーク押え６４の内径面との間に隙間が生じない程度とする。また、上型６１のパンチ嵌入孔６１ａの内径寸法はパンチ６３の本体部６３ａの外径寸法よりも大きく設定される。この場合、上型６１のパンチ嵌入孔６１ａの内径面とパンチ６３の本体部６３ａの外径面との間の隙間を、ブランク材２５の肉厚程度とする。 The punch 63 is composed of a columnar main body 63a and a protruding portion 63b that is connected to the upper end of the main body 63a. Further, the outer diameter of the main body 63a is set to be substantially the same as the inner diameter of the work holder 64. Here, substantially the same means that, as shown in FIG. 11, it can be slidably inserted into the through hole of the work retainer 64, and no gap is formed between the outer diameter surface of the main body 63 a and the inner diameter surface of the work retainer 64. To the extent. Further, the inner diameter dimension of the punch insertion hole 61 a of the upper die 61 is set larger than the outer diameter dimension of the main body portion 63 a of the punch 63. In this case, a gap between the inner diameter surface of the punch insertion hole 61 a of the upper die 61 and the outer diameter surface of the main body portion 63 a of the punch 63 is set to be approximately the thickness of the blank material 25.
　次に、この図１１に示すプレス装置６０にてプレス加工する方法を説明する。まず、ピアス工程が終了して、穴２５ａが形成されたブランク材２５(図１２Ａ等参照)を図１１Ａに示すように、下型６２のワーク載置面にセットする。この状態では、パンチ６３の膨出部６３ｂが、ブランク材２５の穴２５ａに嵌入されている。この状態で、図１１Ｂに示すように、上型６１を下降させる。すなわち、ワーク押え６４にてブランク材２５の端部を押えた状態とする (図１２Ｂ参照) 。この図１１Ｂに示す状態からさらに上型６１を下降させることによって、図１１Ｃ及び図１２Ｄに示すように、パンチ６３が上型６１のパンチ嵌入孔６１ａに嵌入していく。この際、ワーク押え６４は、弾性部材６７の弾性力に抗して下降し、ワーク押え６４にてワークＷ（この場合はブランク材２５である）の端部を押えた状態を維持する。これによって、ブランク材２５の穴２５ａの外周部を上方へ折り曲げることができて、短円筒部１１ａが形成され内輪１１(図１２Ｃ参照)を形成することができる。 Next, a method of pressing with the press device 60 shown in FIG. 11 will be described. First, the piercing process is completed, and the blank member 25 (see FIG. 12A and the like) in which the holes 25a are formed is set on the work placement surface of the lower die 62 as shown in FIG. 11A. In this state, the bulging portion 63 b of the punch 63 is fitted into the hole 25 a of the blank material 25. In this state, the upper die 61 is lowered as shown in FIG. 11B. In other words, a heel (see FIG. 12B) that keeps the end of the blank 25 pressed by the work holder 64. When the upper die 61 is further lowered from the state shown in FIG. 11B, the punch 63 is inserted into the punch insertion hole 61a of the upper die 61 as shown in FIGS. 11C and 12D. At this time, the work presser 64 descends against the elastic force of the elastic member 67 and maintains the state where the work presser 64 holds the end of the work W (in this case, the blank material 25). Thereby, the outer peripheral part of the hole 25a of the blank material 25 can be bent upward, the short cylindrical part 11a can be formed, and the inner ring | wheel 11 (refer FIG. 12C) can be formed.
　ところで、図２Ａおよび図２Ｂに示すように、内輪１１にステーキング部２２が形成される場合、図１３に示すように、ステーキング工程（加締工程）を必要とする。このステーキング工程を有することによって、図１４に示すように、内輪１１の短円筒部１１ａに、その一部が外径側へくちばし状に膨出するステーキング部２２が形成される。 Incidentally, as shown in FIGS. 2A and 2B, when the staking portion 22 is formed on the inner ring 11, a staking step (caulking step) is required as shown in FIG. By having this staking step, as shown in FIG. 14, a staking part 22 is formed in the short cylindrical part 11 a of the inner ring 11 so that a part thereof bulges toward the outer diameter side.
　なお、この図１３では、ブランク工程前にレベラー工程を行い、ピアス工程３１とバーリング工程３２との間に、バリ取り工程を行う。レベラー工程とは、アンコイラから送出された材料（コイル材２４）をレベラーに投入して矯正する工程である。また、磨き工程としては、ホイル加工である。また、この図１３では、ピアス工程３１、バーリング工程３２、ステーキング工程は、プレス機により構成する。 In FIG. 13, a leveler process is performed before the blank process, and a deburring process is performed between the piercing process 31 and the burring process 32. The leveler process is a process in which the material (coil material 24) sent from the uncoiler is put into the leveler and corrected. The polishing process is foil processing. Moreover, in this FIG. 13, the piercing process 31, the burring process 32, and the staking process are comprised with a press machine.
　また、成形後の焼入れとしては、公知公用の浸炭焼入れや高周波焼入れ等の熱処理を行うことになる。このように、熱処理を行うと、テンパーカラーが付着する。このため、図１では、このテンパーカラーを取るための磨き工程（研磨工程）を行っている。 Also, as the quenching after molding, a heat treatment such as carburizing quenching or induction quenching which is publicly known and publicly used is performed. Thus, when heat treatment is performed, the temper collar adheres. For this reason, in FIG. 1, the polishing process (polishing process) for removing this temper color is performed.
　次に、図１５は外輪を構成する軌道輪１２の成形工程を示している。プレス加工として、コイル材２４からブランク材２５（図１６Ａ及び図１７Ａ照）を形成するブランク工程３０と、ブランク材２５に対して所定位置に穴２５ａ（図１６Ｂ及び図１７Ｂ参照）をあけるピアス工程３１と、ピアス工程３１にてピアス工程を施されたブランク材２５にドロー加工を行うドロー工程３４とを備える。なお、図１５では、ドロー工程３４終了後に、成形された軌道輪１２に対して、熱処理を行って、図１に示すような、テンパーカラー取り（みがき工程）を行うことになる。 Next, FIG. 15 shows a molding process of the race 12 constituting the outer ring. As pressing, a blank process 30 for forming a blank material 25 (see FIGS. 16A and 17A) from the coil material 24 and a piercing process for making a hole 25a (see FIGS. 16B and 17B) at a predetermined position with respect to the blank material 25. 31 and a drawing step 34 for drawing the blank material 25 subjected to the piercing step 31 in the piercing step 31. In FIG. 15, after the draw step 34 is finished, the molded race 12 is subjected to heat treatment, and temper color removal (polishing step) as shown in FIG. 1 is performed.
　この際、ブランク工程３０前、及び、ブランク工程３０後のピアス工程３１とドロー工程３４間において、磨き工程（研磨工程）３３を導入することができる。図５Ｃ及び図６Ｃに示すように、ブランク材２５表面に研磨面２５ｂを形成している。なお、表面研磨工程３３としては、ブランク工程３０前のみであっても、ピアス工程３１とドロー工程３４間のみであっても、ブランク工程３０前及びピアス工程３１とドロー工程３４間の２工程であってもよい。また、ブランク工程３０前及びブランク工程３０後とピアス工程３１間の２工程であってもよい。 At this time, a polishing step (polishing step) 33 can be introduced before the blank step 30 and between the piercing step 31 and the draw step 34 after the blank step 30. As shown in FIG. 5C and FIG. 6C, a polishing surface 25 b is formed on the surface of the blank material 25. In addition, as the surface polishing process 33, even before the blank process 30, or only between the piercing process 31 and the draw process 34, two processes before the blank process 30 and between the piercing process 31 and the draw process 34 are performed. There may be. Moreover, two steps between the blank process 30 and after the blank process 30 and the piercing process 31 may be used.
　ドロー工程は図１８に示すプレス装置７０を用いる。プレス装置７０は、上型７１と下型７２とを備える。下型７２はパンチ７３とワーク押え７４とを有する。ワーク押え７４は、下型７２の基板７５に上下動自在なロッド７６の上端に付設され、弾性部材７７にて、弾性的に上方へ押圧されている。 The press process 70 shown in FIG. 18 is used for the drawing process. The press device 70 includes an upper die 71 and a lower die 72. The lower mold 72 has a punch 73 and a work presser 74. The work retainer 74 is attached to the upper end of a rod 76 that is movable up and down on the substrate 75 of the lower mold 72, and is elastically pressed upward by an elastic member 77.
　パンチ７３は、円柱状の本体部７３ａと、この本体部７３ａの上端に連設される突隆部７３ｂとからなる。また、本体部７３ａの外径寸法は、ワーク押え７４の内径寸法と略同一に設定される。ここで、略同一とは、図１８に示すように、ワーク押え７４の貫通孔にスライド自在に嵌入でき、本体部７３ａの外径面とワーク押え７４の内径面との間に隙間が生じない程度とする。 The punch 73 is composed of a columnar main body 73a and a protruding portion 73b that is connected to the upper end of the main body 73a. The outer diameter of the main body 73a is set to be substantially the same as the inner diameter of the work retainer 74. Here, substantially the same as shown in FIG. 18, it can be slidably inserted into the through hole of the work retainer 74, and there is no gap between the outer diameter surface of the main body 73 a and the inner diameter surface of the work retainer 74. To the extent.
　また、上型７１の嵌入孔７１ａにはワーク押え７８が弾性部材７９を介して配設されている。このワーク押え７８は円盤形状体からなり、その下面には凹窪部７８ａが設けられ、この凹窪部７８ａに、図１８Ｂおよび図１８Ｃに示すように、パンチ７３の突隆部７３ｂが嵌入可能となっている。ワーク押え７８の外径寸法と上型７１の嵌入孔７１ａの内径寸法とを略同一に設定している。ここで、略同一とは、上型７１の嵌入孔７１ａにワーク押え７８がスライド自在に嵌入でき、ワーク押え７８の外径面と上型７１の嵌入孔７１ａの内径面との間に隙間が生じない程度とする。 Further, a work presser 78 is disposed in the insertion hole 71 a of the upper mold 71 via an elastic member 79. The work retainer 78 is formed of a disk-shaped body, and a concave portion 78a is provided on the lower surface thereof. As shown in FIGS. 18B and 18C, the protruding portion 73b of the punch 73 can be fitted into the concave portion 78a. It has become. The outer diameter dimension of the work retainer 78 and the inner diameter dimension of the fitting hole 71a of the upper die 71 are set to be substantially the same. Here, “substantially the same” means that the work retainer 78 can be slidably inserted into the insertion hole 71a of the upper mold 71, and a gap is formed between the outer diameter surface of the work retainer 78 and the inner diameter surface of the insertion hole 71a of the upper mold 71. Do not generate.
　さらに、凹窪部７８ａの内径寸法とパンチ７３の膨出部７３ｂの外径寸法とは略同一に設定している。略同一とは、パンチ７３の膨出部７３ｂをワーク押え７８の凹窪部７８ａに嵌入でき、パンチ７３の膨出部７３ｂの外径面とワーク押え７８の凹窪部７８ａの内径面との間に隙間が生じない程度とする。ワーク押え７８の外径寸法をパンチ７３の本体部７３ａの外径寸法よりも大きく設定している。すなわち、上型７１の嵌入孔７１ａの内径面とパンチ７３の本体部７３ａの外径面との間の隙間を、ブランク材２５の肉厚程度とする。 Further, the inner diameter dimension of the recessed portion 78a and the outer diameter dimension of the bulging portion 73b of the punch 73 are set to be substantially the same. The substantially same means that the bulged portion 73b of the punch 73 can be fitted into the recessed portion 78a of the work retainer 78, and the outer diameter surface of the bulged portion 73b of the punch 73 and the inner diameter surface of the recessed portion 78a of the work retainer 78 are It is set so as not to cause a gap between them. The outer diameter dimension of the work retainer 78 is set larger than the outer diameter dimension of the main body 73 a of the punch 73. That is, the gap between the inner diameter surface of the fitting hole 71 a of the upper die 71 and the outer diameter surface of the main body portion 73 a of the punch 73 is set to be approximately the thickness of the blank material 25.
　ピアス工程が終了して、穴２５ａが形成されたブランク材２５(図１６Ｂ、図１７Ｂ、及び図１９Ａ参照)を図１８Ａに示すように、下型７２のワーク載置面にセットする。この状態では、パンチ７３の膨出部７３ｂが、ブランク材２５の穴２５ａに嵌入されているとともに、パンチ７３の本体部７３ａの上面にブランク材２５が載置された状態となっている。すなわち、ワーク押え７４の上面とパンチ７３の本体部７３ａの上面とが同一面上に配設されている。 After the piercing process is completed, the blank 25 (see FIGS. 16B, 17B, and 19A) in which the holes 25a are formed is set on the work placement surface of the lower die 72 as shown in FIG. 18A. In this state, the bulging portion 73 b of the punch 73 is fitted into the hole 25 a of the blank material 25, and the blank material 25 is placed on the upper surface of the main body portion 73 a of the punch 73. That is, the upper surface of the work holder 74 and the upper surface of the main body 73a of the punch 73 are disposed on the same surface.
　この状態で、図１８Ｂ及び図１９Ｂに示すように、上型７１を下降させる。すなわち、ワーク押え７８及び上型７１と、パンチ７３の本体部７３ａの上面及びワーク押え７４の上面とで、ブランク材２５を挟持する。この図１８Ｂ及び図１９Ｂに示す状態からさらに上型７１を下降させる。これによって、図１６Ｄ、図１８Ｃ、及び図１９Ｄに示すように、ブランク材２５の外周部が下方へ折り曲げられて、短円筒部１２ａが形成されて外輪１２が形成される。 In this state, the upper mold 71 is lowered as shown in FIGS. 18B and 19B. That is, the blank material 25 is sandwiched between the work retainer 78 and the upper die 71, and the upper surface of the main body 73 a of the punch 73 and the upper surface of the work retainer 74. The upper die 71 is further lowered from the state shown in FIGS. 18B and 19B. As a result, as shown in FIGS. 16D, 18C, and 19D, the outer peripheral portion of the blank member 25 is bent downward to form the short cylindrical portion 12a and the outer ring 12 is formed.
　そして、このドロー工程後は、図３に内輪１１の成形方法と同様、熱処理及び後工程（みがき工程等）を行うことになる。このため、図１６Ｃ及び図１７Ｃに示すように研磨面２５ｂが形成される。また、図２Ａおよび図２Ｂに示す外輪１２のように、ステーキング部２３が設けられるものであれば、ステーキング工程（加締工程）を必要とする。このステーキング工程を有することによって、外輪１２の短円筒部１２ａに、その一部がくちばし状に膨出するステーキング部２３が形成される。 And after this draw process, the heat treatment and the post-process (the polishing process, etc.) are performed in the same manner as the molding method of the inner ring 11 in FIG. For this reason, the polishing surface 25b is formed as shown in FIGS. 16C and 17C. Moreover, if the staking part 23 is provided like the outer ring | wheel 12 shown to FIG. 2A and FIG. 2B, a staking process (caulking process) will be required. By having this staking process, the staking part 23 in which a part bulges in a beak shape is formed in the short cylindrical part 12 a of the outer ring 12.
　次に、図２０はワッシャ形状の軌道輪１７，１８の成形工程を示している。プレス加工として、コイル材２４からブランク材２５（図２１Ａ及び図２２Ａ参照）を形成するブランク工程３０と、ブランク材２５に対して所定位置に穴２５ａ(図２１Ｂ及び図２２Ｂ参照)をあけるピアス工程３１とを備える。 Next, FIG. 20 shows a molding process of the washer-shaped race rings 17 and 18. As pressing, a blank process 30 for forming a blank material 25 (see FIGS. 21A and 22A) from the coil material 24 and a piercing process for making a hole 25a (see FIGS. 21B and 22B) at a predetermined position with respect to the blank material 25. 31.
　この際、ブランク工程３０前、ブランク工程３０後のピアス工程３１前、及びピアス工程３１後等に磨き工程（研磨工程）３３を導入することができる。これにより、図２１Ｃ及び図２２Ｃに示すように、研磨面８０が形成される。表面研磨工程３３としては、ブランク工程３０前のみであっても、ブランク工程３０後のピアス工程３１前のみ、ピアス工程３２後のみであっても、ブランク工程３０前、ブランク工程３０後のピアス工程３１前、及びピアス工程３１後のいずれか２工程、又はすべての３工程であってもよい。なお、ワッシャ形状の軌道輪１７，１８の成形工程では、バーリング工程やドロー工程を設ける必要が無い。 At this time, a polishing step (polishing step) 33 can be introduced before the blanking step 30, before the piercing step 31 after the blanking step 30, and after the piercing step 31. Thereby, the polishing surface 80 is formed as shown in FIGS. 21C and 22C. As the surface polishing process 33, even before the blank process 30, only before the piercing process 31 after the blank process 30, and only after the piercing process 32, the piercing process before the blank process 30 and after the blank process 30. It may be any two steps before 31 and after piercing step 31, or all three steps. In the process of forming the washer-shaped races 17 and 18, there is no need to provide a burring process or a drawing process.
　本発明では、表面研磨工程の際には、ワークＷが平板形状であるので、ワーク表面全体を均一かつ高速に研磨加工することができる。すなわち、素材粗さが粗いコイル材２４(例えば、Ｒａ３μｍ以下)を使用しても、短時間（例えば、数秒）で研磨加工ができる。また、研磨工程をプレスラインの間に入れ、ライン化することで中間在庫を持つことなく成形できるようになる。このため、低コスト化及び生産性の向上を図ることができる。 In the present invention, since the workpiece W has a flat plate shape during the surface polishing step, the entire workpiece surface can be uniformly and rapidly polished. That is, even if the coil material 24 (for example, Ra 3 μm or less) having a rough material is used, polishing can be performed in a short time (for example, several seconds). Moreover, it becomes possible to form without having an intermediate stock by putting a polishing process between the press lines and making it into a line. For this reason, cost reduction and productivity improvement can be aimed at.
　成形する軌道輪として、軸受の内輪であっても、軸受の外輪であっても、ワッシャー形状の内輪や外輪であってもよい。磨き工程（表面研磨工程）には、ホイール研磨加工、ブラシ研磨加工、ベルト研磨加工、及びショット加工がある。 The bearing ring to be molded may be a bearing inner ring, a bearing outer ring, a washer-shaped inner ring or an outer ring. The polishing process (surface polishing process) includes wheel polishing, brush polishing, belt polishing, and shot processing.
１１   軌道輪（内輪）
１２   軌道輪（外輪）
１７，１８    軌道輪
３０   ブランク工程
３１   ピアス工程
３２   バーリング工程
３３   表面研磨工程
３４   ドロー工程
Ｗ     ワーク 11 Track ring (inner ring)
12 Race ring (outer ring)
17, 18 Raceway 30 Blanking process 31 Piercing process 32 Burring process 33 Surface polishing process 34 Draw process W Workpiece

Claims (10)

  1. 　単一または複数種のプレス工程を有するプレスライン内において、平板形状のワークに対して表面研磨工程を行うことを特徴とするスラスト軸受用の軌道輪成形方法。 A method for forming a bearing ring for a thrust bearing, wherein a surface polishing step is performed on a plate-shaped workpiece in a press line having a single or a plurality of types of pressing steps.
  2. 　プレス工程としてブランク工程を有し、このブランク工程前に前記表面研磨工程を有することを特徴とする請求項１に記載のスラスト軸受用の軌道輪成形方法。 The bearing ring forming method for a thrust bearing according to claim 1, wherein the pressing step includes a blank step, and the surface polishing step is included before the blank step.
  3. 　プレス工程としてピアス工程を有し、このピアス工程前に前記表面研磨工程を有することを特徴とする請求項１に記載のスラスト軸受用の軌道輪成形方法。 The bearing ring forming method for a thrust bearing according to claim 1, further comprising a piercing step as a pressing step, and the surface polishing step before the piercing step.
  4. 　プレス工程としてバーリング工程を有し、バーリング工程前に前記表面研磨工程を有することを特徴とする請求項１に記載のスラスト軸受用の軌道輪成形方法。 The bearing ring forming method for a thrust bearing according to claim 1, wherein the pressing step includes a burring step, and the surface polishing step is included before the burring step.
  5. 　プレス工程としてドロー工程を有し、ドロー工程前に前記表面研磨工程を有することを特徴とする請求項１に記載のスラスト軸受用の軌道輪成形方法。 The bearing ring forming method for a thrust bearing according to claim 1, further comprising a draw step as a pressing step, and the surface polishing step before the draw step.
  6. 　成形する軌道輪が内輪であることを特徴とする請求項１～請求項４のいずれか１項に記載のスラスト軸受用の軌道輪成形方法。 The bearing ring forming method for a thrust bearing according to any one of claims 1 to 4, wherein the bearing ring to be formed is an inner ring.
  7. 　成形する軌道輪が外輪であることを特徴とする請求項１～請求項３のいずれか１項、又は請求項５に記載のスラスト軸受用の軌道輪成形方法。 6. The method for forming a bearing ring for a thrust bearing according to claim 1, wherein the bearing ring to be formed is an outer ring.
  8. 　成形する軌道輪がワッシャー形状の内輪であることを特徴とする請求項１～請求項３のいずれか１項に記載のスラスト軸受用の軌道輪成形方法。 The bearing ring forming method for a thrust bearing according to any one of claims 1 to 3, wherein the bearing ring to be formed is a washer-shaped inner ring.
  9. 　成形する軌道輪がワッシャー形状の外輪であることを特徴とする請求項１～請求項３のいずれか１項に記載のスラスト軸受用の軌道輪成形方法。 The bearing ring forming method for a thrust bearing according to any one of claims 1 to 3, wherein the bearing ring to be formed is a washer-shaped outer ring.
  10. 　前記表面研磨工程が、ホイール研磨加工、ブラシ研磨加工、ベルト研磨加工、及びショット加工の少なくともいずれか一つ工程を含むことを特徴とする請求項１～請求項９のいずれか１項に記載のスラスト軸受用の軌道輪成形方法。 The surface polishing step includes at least one of a wheel polishing process, a brush polishing process, a belt polishing process, and a shot process, according to any one of claims 1 to 9. A method for forming a ring for a thrust bearing.
PCT/JP2017/011070 2016-03-31 2017-03-17 Bearing ring-forming method WO2017169937A1 (en)

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JP2003103449A (en) * 2001-09-27 2003-04-08 Nsk Ltd Grinding method for bearing component
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CN108906949B (en) * 2018-09-14 2023-09-15 苏州轴承厂股份有限公司 One-step forming flanging device for stamping outer ring

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