JP2012170988A - Outer race radial compression forming apparatus and method for manufacturing bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer race radial compression forming apparatus and a method for manufacturing a bearing by means of which an outer race can be formed out of a punched and separated outer race member with a small forming load, the outer race having the minimum inside diameter larger that the maximum outside diameter of an inner race.SOLUTION: An outer race member W1 having the diameter larger than that of an outer race of a bearing to be manufactured is set between a plurality of split dies 13a-13f arranged in such a way that pressurization faces 13a1-13f1 are located on the same circumference with the predetermined spacing therebetween. By moving the plurality of split dies 13a-13f in a direction toward the center of a pressurization space 13A, the plurality of split dies 13a-13f apply pressure to the outer race member W1 from the outer circumferential portion thereof so that the diameter of the outer race member W1 is reduced to the substantially same diameter as that of the outer race of the bearing to be finally manufactured.

Description

  The present invention relates to an outer ring radial compression molding apparatus for molding an outer ring whose inner ring has a larger maximum outer diameter than the minimum inner diameter of the outer ring from an outer ring member separated from an inner and outer ring integrated member having a shape in which an inner ring and an outer ring of a bearing overlap. The present invention relates to a bearing manufacturing method.

  In a conventional outer ring radial compression molding apparatus, for example, when forming an outer ring of a bearing whose maximum outer diameter is larger than the minimum inner diameter of the outer ring, such as a tapered bearing (conical bearing), the maximum outer diameter of the inner ring is smaller than the minimum inner diameter of the outer ring. Since the diameter is larger, first, after punching into the inner and outer ring integral member in which the inner ring and outer ring of the bearing overlap, the outer ring member and the inner ring member are separated by punching, for example, the tip of the outer ring member By pressurizing the inside with a punch and a die or roller and pushing the meat inside the tip of the outer ring member to the inside, the outer ring having a larger maximum outer diameter than the minimum inner diameter of the outer ring was reshaped ( For example, see Patent Documents 1 to 4). In this case, the outer diameter of the outer ring member is not changed.

Japanese Patent Laid-Open No. 07-035143 JP 07-048552 A Japanese Patent Application Laid-Open No. 07-054851 JP 2004-290983 A

  However, in the conventional outer ring radial compression molding apparatus or bearing manufacturing method described in Patent Documents 1 to 4, after the outer ring member is punched and separated from the inner and outer ring integrated members, the inner side of the outer ring member is punched and dies or rollers. The outer ring has a larger inner diameter than the minimum inner diameter of the outer ring by re-forming the outer ring by pressing the inner ring and pressing the inner ring. There are problems such as a large molding load when extruding inward and difficulty in molding.

  Therefore, the present invention can punch and separate the outer ring member from the inner and outer ring integrated members, and can mold an outer ring having a larger maximum outer diameter than the minimum inner diameter of the outer ring with a small molding load from the punched and separated outer ring member. An object of the present invention is to provide an outer ring radial compression molding apparatus and a bearing manufacturing method.

In order to solve the above problems, the outer ring radial compression molding apparatus of the present invention is arranged such that the pressurizing surfaces are positioned on the same circumference at a predetermined interval, and the pressurizing space surrounded by the pressurizing surfaces An outer ring member having a diameter larger than that of the outer ring of the bearing to be manufactured is set, a plurality of divided dies that press the respective pressing surfaces against the outer peripheral side surface of the outer ring member, and the pressurizing space of the plurality of divided dies. A split die pressing mechanism that reduces the diameter of the outer ring member by applying a load in the center direction and moving the plurality of split dies in the center direction of the pressurizing space, respectively. This is an outer ring radial compression molding apparatus.
Here, each of the plurality of divided dies has a tapered outer peripheral surface whose diameter decreases as it goes downward along the axial direction of the pressure cylinder, while the divided die pressing mechanism portion includes the plurality of divided dies. A pressure cylinder that pressurizes and lowers the upper surface of the die; and supports upper ends of the plurality of divided dies that protrude and contact taper outer peripheral surfaces of the plurality of divided dies. A plurality of divided dies, and a plurality of divided dies, each having a tapered die support portion having a tapered support surface that decreases in diameter in the axial direction of the pressure cylinder. You may make it descend | fall by pressurization and to approach the center direction of the said pressurization space by the said taper support surface of the said division | segmentation die-throttle part.
Further, the split die pressing mechanism portion repeatedly performs a predetermined diameter reduction and pressurization for stopping the pressurization on the separated outer ring member a predetermined number of times. You may make it have a workpiece | work rotation mechanism part which rotates the said outer ring member for every predetermined angle at the time of loading.
Also, the bearing manufacturing method of the present invention is an inner / outer ring integrated member for manufacturing an inner / outer ring integrated member having an outer ring member having a larger diameter than the outer ring of the bearing to be finally manufactured and an inner ring member having substantially the same diameter as the inner ring. Manufacturing process, inner and outer ring separation step of separating the outer ring member and the inner ring member from the inner and outer ring integral member, and an outer ring of the bearing that is finally manufactured by applying pressure from the outer peripheral portion of the separated outer ring member And an outer ring diameter reducing step for reducing the diameter of the outer ring to substantially the same diameter.
Here, in the outer ring diameter reducing step, the diameter of the separated outer ring member is reduced by pressurization, the gradual load for stopping the pressurization, and the outer ring member is rotated by a predetermined angle at the time of the gradual load. The work index may be repeated a predetermined number of times.

  In the outer ring radial compression molding apparatus and the bearing manufacturing method of the present invention, a load directed toward the center of the pressurizing space is applied to a plurality of divided dies arranged so that the pressurizing surfaces are located at the same circumference at predetermined intervals. Then, by moving the plurality of dice in the direction of the center of the pressurizing space, pressure is applied from the outer peripheral part of the outer ring member so that it is contracted to approximately the same diameter as the outer ring of the bearing to be finally produced. The outer ring member can be punched and separated from the ring-integrated member, and an outer ring having a maximum inner diameter larger than the minimum inner diameter of the outer ring can be formed from the punched and separated outer ring member with a small molding load.

It is a partial end elevation showing the example of composition of the whole outer ring radial compression molding device of this embodiment. FIG. 2 is an enlarged end view showing an enlarged cross section of a main part of the outer ring radial compression molding apparatus of the embodiment shown in FIG. 1. (A), (b) is the top view and perspective view which respectively looked at the division | segmentation die expansion | squeezing part and the some division | segmentation die in the outer ring radial compression molding apparatus of embodiment shown in FIG. (A), (b) is a figure which shows an example of the outer ring member before and behind radial compression processing by this embodiment, respectively. It is an end elevation which shows simply the diameter reduction process by a division | segmentation die and a workpiece | work index operation | movement in the outer ring | wheel radial compression molding apparatus of this embodiment. It is a flowchart which shows the repetition procedure in radial compression molding in the outer ring | wheel radial compression molding apparatus of this embodiment. (A), (b) is a figure which shows the effect of radial compression molding and a work index process in the outer ring | wheel radial compression molding apparatus of this embodiment shown in FIG. 6, respectively.

  Next, an embodiment of an outer ring radial compression molding apparatus and a bearing manufacturing method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a partial end view showing a configuration example of the entire outer ring radial compression molding apparatus of the present embodiment and a cross section of the main part thereof, and FIG. 2 is a cross section of the main part of the outer ring radial compression molding apparatus of the embodiment shown in FIG. 3 is an enlarged end view, and FIGS. 3A and 3B are a plan view and a perspective view, respectively, of a split die drawing portion in the outer ring radial compression molding apparatus of the embodiment shown in FIG. It is.

  The outer ring radial compression molding apparatus 1 according to the present embodiment is a bearing that is separated from an inner and outer ring integrated member in a shape in which steel bars are cut at predetermined intervals and the outer ring and inner ring of the bearing formed by upsetting, cutting, or the like are stacked. The outer ring member W1 having a diameter slightly larger than that of the outer ring is reduced in diameter, and an outer ring member having substantially the same diameter as the outer ring to be finally manufactured is formed.

  Therefore, the outer ring radial compression molding apparatus 1 of the present embodiment includes, as shown in FIG. 1, a vertical drive unit 11, a pressurizing cylinder 12, and a plurality of pieces as shown in FIG. 6).) A die portion 13 composed of split dies 13a to 13f, a split die throttle portion 14, a workpiece receiving portion 15, an index driving portion 16, a vertical movement cylinder 17, and a pushing arrow operating cylinder 18. And a base 19. Here, the up-and-down drive part 11, the pressurizing cylinder 12, and the divided die restricting part 14 correspond to the divided die pressing mechanism part of the present invention. Moreover, the workpiece | work receiving part 15 and the index drive part 16 are equivalent to the workpiece | work rotation mechanism part of this invention.

  The vertical drive unit 11 moves the pressure cylinder 12 up and down. The pressurizing cylinder 12 moves the pressurizing piston 121 up and down by hydraulic pressure or the like, and on the upper surface of the die portion 13 composed of a plurality of (here, six, for example, for convenience of explanation) divided dies 13a to 13f. It is a device that applies a load and applies a hydraulic press of about 30 tons.

  As shown in FIGS. 3A and 3B, the die portion 13 is composed of a plurality of divided dies 13a to 13f, and the pressing surfaces 13a1 to 13f1 of the divided dies 13a to 13f are the same with a predetermined interval therebetween. It arrange | positions so that it may be located in the periphery shape. Here, the pressurizing surfaces 13a1 to 13f1 extend in the vertical direction, which is the axial center CL direction of the pressurizing cylinder 12, as shown in FIG. 1 and FIG. In the horizontal direction perpendicular to the axis CL direction, as shown in FIGS. 3A and 3B, a curved surface is processed so as to be the outer peripheral side surface of the outer diameter of the outer ring to be finally manufactured. . FIG. 3B shows a state in which the divided die 13f is removed from the divided dies 13a to 13f.

  Further, each of the divided dies 13a to 13f has a tapered outer peripheral side surface 13a2 whose diameter decreases toward the lower side along the axis CL direction of the pressurizing cylinder 12 on the rear side surface opposite to the pressurizing surfaces 13a1 to 13f1. When the pressure cylinder 12 is lowered by pressurization, it is guided by the taper support surface 14a of the divided die restrictor 14, and the axis CL of the pressure cylinder 12, that is, the center of the pressure space 13A is formed. Move closer to the direction. As a result, the outer ring member W1 having a larger diameter than the outer ring of the bearing is set in the pressurizing space 13A surrounded by the pressurizing surfaces 13a1 to 13f1 of the respective divided dies 13a to 13f. The pressure surfaces 13a1 to 13f1 can be pressed and pressed to reduce the diameter. As will be described later, the outer ring radial compression molding apparatus 1 of the present embodiment repeatedly reduces the diameter of the one outer ring member W1 by a plurality of times, not a single diameter reduction.

  Here, in the divided dies 13a to 13f of the present embodiment, as shown in FIG. 3A, the corners of the left and right side surfaces on the pressing surfaces 13a1 to 13f1 side are scraped to form chamfered portions, respectively. . As a result, even if the divided dies 13a to 13f are closer to the axial center CL direction of the pressure cylinder 12 and contact each other, the chamfered portions are in contact with each other, so that the corners of the divided dies 13a to 13f are scraped. In addition to preventing damage, excessive reduction in diameter can be prevented if the point where the chamfered portion contacts is the minimum diameter of the outer ring.

  As shown in FIGS. 1 and 2, the divided die narrowing portion 14 is fixed to the upper surface of the base 19, and the upper ends of the plurality of divided dies 13 a to 13 f are projected to taper the plurality of divided dies 13 a to 13 f. The outer peripheral side surfaces 13a2 to 13f2 are supported in contact with each other, and as the plurality of divided dies 13a to 13f are lowered by the pressurization of the pressurization cylinder 12, the pressurization cylinder 12 is lowered downward so that the inner diameter decreases in the axial center CL direction. It has a taper support surface 14a whose diameter decreases as it goes.

  Further, as shown in FIGS. 1 and 2, the divided die restricting portion 14 is lowered to the lowest point by the pressurizing piston 121 of the pressurizing cylinder 12, and the plurality of split dies 13 a to 13 f that have been subjected to the diameter reduction process are removed. A spring 14b is provided for lifting and gradually loading (returning).

  The workpiece receiving portion 15 chucks and supports the outer ring member W1, which is a workpiece, from below, and the pushing arrow 181 is inserted or withdrawn by the pushing arrow operating cylinder 18 to expand or contract in the radial direction thereof, and the outer ring member W1 shrinks. Is to chuck.

  The index driving unit 16 rotates the outer ring member W1 by a predetermined angle, that is, performs an indexing operation when the load is gradually lowered when the pressurizing piston 121 is raised and pressurization by the plurality of divided dies 13a to 13f is stopped.

  The vertical movement cylinder 17 is fixed to the lower surface of the base 19 and vertically moves the workpiece receiving portion 15 and the arrow operating cylinder 18 by hydraulic pressure or the like.

  Further, the pushing arrow operating cylinder 18 inserts or removes the pushing arrow 181 in the center hole of the workpiece receiving portion 15 to expand or contract the workpiece receiving portion 15 to chuck the outer ring member W1.

  4A and 4B are views showing an example of the outer ring member before and after the radial compression processing according to the present embodiment, respectively.

  In the outer ring radial compression molding apparatus 1 of the present embodiment, the outer ring member W1 is punched and separated from the inner and outer ring integrated members formed by stacking the outer ring member W1 and the inner ring member, and the outer ring member W1 is punched and separated from the outer ring member W1 with a small molding load. Since the purpose is to form an outer ring having a larger maximum outer diameter than the minimum inner diameter, the outer ring member W1 having a diameter larger than the diameter of the outer ring to be manufactured as shown in FIG. The diameter reduction process as shown in FIG. 4B, that is, the process of reducing the diameter by applying pressure from the outside of the outer ring member W1 is performed to obtain the diameter of the outer ring to be manufactured.

  Next, a diameter reduction process that is a radial compression operation of the divided dies 13a to 13f in the outer ring radial compression molding apparatus 1 of the present embodiment and an index operation of a workpiece by the index driving unit 16 will be described.

  FIG. 5 is an end view schematically showing the diameter reduction processing and the work index operation by the divided dies 13a to 13f in the outer ring radial compression molding apparatus 1 of the present embodiment.

  As shown in FIGS. 3 and 5, the pressurizing piston 121 of the pressurizing cylinder 12 hits the upper surface of the plurality of split dies 13 a to 13 f constituting the die portion 13 projecting from the upper surface of the split die restricting portion 14. When the divided dies 13a to 13f are pushed downward, the tapered outer peripheral side surfaces 13a2 to 13f2 of the divided dies 13a to 13f are guided to the tapered support surface 14a of the divided die narrowing portion 14, and a plurality of divided dies 13a are caused by the so-called wedge effect. ˜13f approaches the axial center CL direction of the pressurizing cylinder 12, and executes the diameter reduction of the outer ring member W1 in the radial direction.

  Here, in the outer ring radial compression molding apparatus 1 of the present embodiment, the outer ring member W1 is not reduced in diameter in the radial direction by the plurality of divided dies 13a to 13f only once, but gradually loaded (returned) to the outer ring member W1. ), The outer ring member W1 is rotated to repeatedly reduce the diameter. However, in the present invention, when the outer ring member W1 is reduced in diameter in the radial direction even if it is sufficient only once, it is of course possible to perform only once. In this case, the process of rotating the outer ring member W1 can be omitted.

  That is, in the outer ring radial compression molding apparatus 1 of the present embodiment, the index driving unit 16 operates to chuck the outer ring member W1 while the pressure cylinder 12 stops pressing and lifts (returns) the load. The workpiece receiving part 15 is rotated by a predetermined angle.

  FIG. 6 is a flowchart showing a repetition procedure in the radial compression molding in the outer ring radial compression molding apparatus 1 of the present embodiment.

  That is, as shown in FIG. 6, in the outer ring radial compression molding apparatus 1 according to the present embodiment, pressure (diameter reduction) is performed by lowering the pressurizing piston 121 (step S <b> 100), and then the pressurizing piston 121 is lifted. A slow load (return) is performed (step S110), and a series of processes called a work index process (step S120) in which the index driving unit 16 operates to rotate the outer ring member W1 by a predetermined angle is repeatedly performed a predetermined number of times.

  FIGS. 7A and 7B are views showing the effects of radial compression molding and work index processing in the outer ring radial compression molding apparatus 1 of the present embodiment shown in FIG. 6, respectively.

  That is, when the outer ring member W1 is radially reduced once by the plurality of divided dies 13a to 13f, as shown in FIG. 7A, the outer ring member is formed in the gap between the plurality of divided dies 13a to 13f. A protruding portion W11 is generated on the outer periphery of W1.

  Therefore, in the outer ring radial compression molding apparatus 1 of the present embodiment, the index driving unit 16 operates to rotate the outer ring member W1 during the slow load (return) when the pressurizing cylinder 12 stops pressurization. Here, in the present embodiment, the index driving unit 16 has six divided dice 13a to 13f arranged at intervals of 60 degrees, and thus, for example, is rotated by 30 degrees.

  Then, as shown in FIG. 7 (b), the protruding portion of the outer ring member W1 generated in the gap between the plurality of divided dies 13a to 13f is the next adjacent divided die 13a at the time of the next diameter reduction (pressurization). Since pressure is applied to the pressure surfaces 13a1 to 13f1 of ~ 13f, it is possible to smooth the outer peripheral side surface of the outer ring member W1 by crushing the protruding portion of the outer ring member W1 generated during the diameter reduction (pressurization). Repeat this many times.

  However, in the case where each of the divided dies 13a to 13f is six, when the outer ring member W1 is rotated by 30 degrees, the protrusions W11 generated on the outer ring member W1 are spaced once and the gaps between the plurality of divided dies 13a to 13f Therefore, the index driving unit 16 is, for example, 10 degrees or 13 degrees so that the protruding portion W11 once generated in the outer ring member W1 does not immediately or permanently come into the gap between the divided dies 13a to 13f. The rotation angle may be set as appropriate, such as 17 degrees, 25 degrees, or 50 degrees. In this way, the outer peripheral side surface of the outer ring member W1 can be made smoother.

  As a result, for example, when the inner diameter of the outer ring member W1 having an inner diameter of 78 mm is reduced to 3 mm and formed into 75 mm, the protrusion portion W11 is formed on the outer periphery of the outer ring member W1 between the divided dies 13b and 13c. As a result, a level difference is generated, and an excessive molding pressure of about 600 tons is required.

  On the other hand, when the outer ring member W1 is rotated by a predetermined angle by the outer ring radial compression molding apparatus 1 of this embodiment and the diameter is reduced by 10 times by 0.3 mm, the outer ring member W1 between the divided dies 13b and 13c is used. The outer peripheral surface of the outer ring member W1 becomes smooth, and a molding pressure equivalent to that of a turning machine or stamping machine of about 30 tons is sufficient.

  Therefore, according to the outer ring radial compression molding apparatus 1 of the present embodiment, the pressing surfaces 13a1 to 13f1 are pressed against the plurality of divided dies 13a to 13f arranged so as to be positioned on the same circumference with a predetermined interval. By applying a load toward the center of the space 13A and moving the plurality of divided dies 13a to 13f toward the center of the pressurizing space 13A, the diameter of the outer ring member W1 is reduced by the plurality of division dies 13a to 13f. Thus, the outer ring member W1 can be punched and separated from the inner and outer ring integrated members, and a small molding load can be obtained from the punched and separated outer ring member W1. Thus, it is possible to form an outer ring in which the maximum outer diameter of the inner ring is larger than the minimum inner diameter of the outer ring.

  In particular, the outer ring radial compression molding apparatus 1 of the present embodiment includes a pressure cylinder 12 that pressurizes and lowers the upper surfaces of the plurality of divided dies 13a to 13f, and a divided die constricting portion 14 having a tapered support surface 14a. The plurality of divided dies 13a to 13f have tapered outer peripheral side surfaces 13a2 to 13f2 whose diameters become smaller along the axial center CL direction of the pressure cylinder 12, and the pressure cylinder 12 has the plurality of divided dies 13a. The upper surface of ˜13f is pressurized and lowered, and moved toward the center of the pressurizing space A by the taper support surface 14a of the divided die restricting portion 14 to reduce the diameter of the outer ring member W1, so that the structure or mechanism is simple. The diameter of the outer ring member W1 can be reduced. In the present invention, it is optional to reduce the diameter by pressing the upper surfaces of the plurality of divided dies 13a to 13f. Of course, the outer peripheral side surfaces of the plurality of divided dies 13a to 13f may be pressed to reduce the diameter. Good.

  Further, in the outer ring radial compression molding apparatus 1 of the present embodiment, the work index that pressurizes (reduces) the outer ring member W1, unloads (returns) the outer ring member W1, and rotates the outer ring member W1 by a predetermined angle. Since the outer ring member W1 is gradually reduced in diameter, the diameter reduction can be executed with a small molding load, and the protruding portions W11 generated between the plurality of divided dies 13a to 13f are sequentially crushed, A smooth outer ring member in which a step is not conspicuous on the outer peripheral side surface of the outer ring member W1 can be formed.

  In the outer ring radial compression molding apparatus 1 according to the present embodiment, the number of divisions of the plurality of divided dies 13a to 13f has been described as six. However, the present invention is not limited to this, and five, seven, Any number can be used.

  In the outer ring radial compression molding apparatus 1 according to the present embodiment, the work index for rotating the outer ring member W1 by a predetermined angle at the time of slow load is described. However, the protruding portion W11 generated on the outer ring member W1 is ignored or polished. The work index process may be omitted if it can be deleted.

  Further, in the bearing manufacturing method of the present embodiment, the inner and outer ring integrated members that manufacture the inner and outer ring integrated members having the outer ring member having a larger diameter than the outer ring of the bearing to be finally manufactured and the inner ring member having substantially the same diameter as the inner ring. A member manufacturing step, an inner / outer ring separating step for separating the outer ring member and the inner ring member from the inner / outer ring integrated member, and an outer ring of the bearing that is finally manufactured by applying pressure from the outer peripheral portion of the separated outer ring member And an outer ring diameter reducing step for reducing the diameter to substantially the same diameter. Here, this outer ring diameter reducing step may be executed using the outer ring radial compression molding apparatus 1 of the present embodiment described above, or may not be used. As a result, according to the bearing manufacturing method of the present embodiment, the outer ring member can be punched and separated from the inner and outer ring integrated members, and the maximum outer diameter of the inner ring is smaller than the minimum inner diameter of the outer ring with a small molding load from the punched and separated outer ring member. A large outer ring can be formed.

  In the bearing manufacturing method according to the present embodiment, in the outer ring contraction step, the outer ring member is contracted by a predetermined angle with respect to one outer ring member by reducing the diameter by pressurization, gradually loading to stop the pressurization, If the work index to be rotated is repeatedly performed a predetermined number of times, the diameter can be reduced with a small molding load, and the protrusions generated in the gaps between the plurality of divided dies are sequentially crushed to form a step on the outer ring member outer peripheral side surface. It is possible to form a smooth outer ring member that is not noticeable.

DESCRIPTION OF SYMBOLS 1 Outer ring radial compression molding apparatus 11 Vertical drive part (split die press mechanism part)
12 Pressure cylinder (split die pressing mechanism)
13 Die Part 13A Pressurizing Space 13a-13f Divided Dies 13a1-13f1 Pressurizing Surface 13a2-13f2 Tapered Outer Side Surface 14 Divided Die Restrictor (Divided Die Pressing Mechanism)
14a Taper support surface 15 Work receiving part (work rotating mechanism part)
16 Index drive (work rotation mechanism)
17 Vertical movement cylinder 18 Pusher operation cylinder 19 Base W1 Outer ring member

Claims (5)

The pressurizing surfaces are arranged so as to be located on the same circumference at a predetermined interval, and an outer ring member having a larger diameter than the outer ring of the bearing to be manufactured is set in the pressurizing space surrounded by the pressurizing surfaces. A plurality of split dies that press the respective pressing surfaces against the outer peripheral side surface of the outer ring member;
A split die press for reducing the diameter of the outer ring member by applying a load in the center direction of the pressurizing space to the split dies and moving the split dies in the center direction of the pressurizing space. A mechanism part;
An outer ring radial compression molding apparatus characterized by comprising: In the outer ring radial compression molding apparatus according to claim 1,
Each of the plurality of split dies is
While having a tapered outer peripheral side surface whose diameter decreases as it goes downward along the axial direction of the pressure cylinder,
The split die pressing mechanism is
A pressure cylinder that pressurizes and lowers the upper surfaces of the plurality of split dies;
The upper ends of the plurality of divided dies are protruded to contact and support the tapered outer peripheral side surfaces of the plurality of divided dies, and as the plurality of divided dies descend by the pressurization of the pressure cylinder, the shaft of the pressure cylinder A divided die restrictor having a tapered support surface whose diameter decreases toward the center,
The plurality of split dies are lowered by pressurization of the pressurizing cylinder, and approach the center direction of the pressurization space by the taper support surface of the split die throttle part.
An outer ring radial compression molding apparatus characterized by that. In the outer ring radial compression molding apparatus according to claim 1 or 2,
The split die pressing mechanism is
While reducing the diameter of the separated outer ring member by pressurization and the unloading that stops pressurization a predetermined number of times,
further,
A workpiece rotating mechanism for rotating the outer ring member by a predetermined angle at the time of slow loading by the plurality of divided dies;
An outer ring radial compression molding apparatus characterized by that. An inner / outer ring integrated member manufacturing step for manufacturing an inner / outer ring integrated member having an outer ring member having a diameter larger than the outer ring of the bearing to be finally manufactured and an inner ring member having substantially the same diameter as the inner ring;
An inner / outer ring separation step of separating the outer ring member and the inner ring member from the inner / outer ring integrated member;
Applying pressure from the outer peripheral portion of the separated outer ring member, and reducing the outer ring to a diameter that is substantially the same as the outer ring of the bearing to be finally produced;
A method for manufacturing a bearing, comprising: In the outer ring radial compression molding apparatus according to claim 4,
In the outer ring diameter reducing step,
For the separated one outer ring member, a reduced diameter by pressurization, a slow load that stops pressurization, and a work index that rotates the outer ring member by a predetermined angle at the time of the slow load, are repeated a predetermined number of times.
A bearing manufacturing method characterized by the above.

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