JP2004148385A - Manufacturing method and apparatus for bearing with groove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a highly precise machining, an efficient production in a short period of time as well as a possible reduction of cost. <P>SOLUTION: A split die 3 made of a hard material, which has a main body of mostly cylindrical shape with a hole for thrusting, herringbone-shaped projections 33 on its outer circumferential surface as well as a plurality of slits, is inserted from an opening 23 on one end into a lower hole 20 of a cylindrical blank body 2 made of a soft material. A wedge-shaped shaft 4 with its diameter narrower toward its tip is inserted from an opening 22 on the other end of the cylindrical blank body 2, forcibly expands an outer diameter of the split die 3 by thrusting of the shaft 4, and forms pressure grooves for bearing by transferring the pattern of projection 33 onto the inner peripheral surface of the cylindrical blank body 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for manufacturing a grooved bearing that rotatably supports a rotating shaft with a grooved bearing.
[0002]
[Prior art]
With personal computers such as notebook computers, it has become difficult to structurally release heat from the MPU and other components mounted inside the main unit as the speed and performance have increased. For example, a dedicated fan motor It is known that a cooling performance is enhanced by mounting the above.
[0003]
In such a fan motor, an increase in the number of revolutions directly leads to a cooling effect, but on the other hand, an increase in noise has become a problem, and a fan motor that satisfies both high cooling performance and low noise performance is required. Is required. Therefore, a motor that uses a dynamic pressure type grooved fluid bearing, which has a completely different structure from the conventional ball bearing system, for the bearing that supports the rotating shaft of the motor has been proposed and developed. For example, application to a wide range of fields such as a spindle motor for an HDD is also expected.
[0004]
This fluid bearing has a structure in which lubricating oil containing a special component is filled between the rotating shaft and the ball instead of the metal ball of the ball bearing. It has excellent features such as no generation, high impact resistance, and little vibration.
[0005]
Next, the structure of the fluid bearing will be specifically described.
FIG. 9 shows an example of the above-mentioned dynamic pressure type fluid bearing. In this dynamic pressure type fluid bearing, a pressure groove 103 for generating a dynamic pressure is formed on the inner peripheral surface of a rotary hole 102 of a sleeve cylinder 101. I have. A rotating shaft 104 is inserted into the rotating hole 102 of the sleeve cylinder 101, and lubricating oil 105 is injected between the rotating hole 102 and the rotating shaft 104 of the sleeve cylinder 101, and the bearing is mounted. Make up.
[0006]
In the dynamic pressure type fluid bearing having such a configuration, when the rotation shaft 104 is rotated by a rotation driving means (not shown) and rotates in the α direction, the lubricating oil 105 moves along with the rotation shaft 104 along the pressure groove 103 for generating dynamic pressure. Therefore, the pressure in the central portion β increases. As a result, the rotating shaft 104 is supported in a non-contact state with respect to the sleeve cylinder 101 and rotates.
[0007]
Next, a method of processing and manufacturing a grooved fluid bearing will be described with reference to FIG. 10 (for example, see Patent Document 1).
First, a workpiece 106 having a substantially cylindrical shape (hereinafter referred to as a blank cylindrical body) having a bearing pilot hole 106A penetrated by a lathe or the like is prepared and fixed to the holding member 107. .
Next, the groove processing tool 108 having a ball (hard sphere) 108A on the outer peripheral surface is slid in the axial direction and inserted into the prepared hole 106A of the blank cylinder 106, and is also rotated clockwise and counterclockwise. While pushing in.
As a result, a pressure groove 106B having a herringbone (spiral) or helical (spiral) shape is formed on the inner peripheral surface of the pilot hole 106A. Thereby, the sleeve cylinder 101 is manufactured.
[0008]
[Patent Document 1]
JP-A-7-299524 (FIG. 1 on the right column on page 2)
[0009]
[Problems to be solved by the invention]
However, when processing is performed using the groove processing tool having such a configuration, it is difficult to adjust the balance between the rotation speed and the pushing speed of the groove processing tool 108 inserted into the prepared hole 106A of the blank cylindrical body 106, and these are difficult. When the speed fluctuates, the pattern of the formed pressure groove also slightly changes, so that the processing of the pressure groove is difficult, and the accuracy tends to vary. In addition, for example, since a processing time of about 10 seconds is required for each sleeve, it is difficult to process a plurality of sleeves at the same time, resulting in poor productivity and high cost.
[0010]
In view of the above circumstances, the present invention provides a groove capable of processing a pressure groove with high accuracy, and capable of efficiently producing the pressure groove in a short time, and further reducing the cost. It is an object of the present invention to provide a method and an apparatus for manufacturing a bearing.
[0011]
[Means for Solving the Problems]
The present invention is a method of manufacturing a grooved bearing that rotatably supports a rotating shaft with a grooved bearing,
The main body formed into a substantially cylindrical shape having a push hole penetrating the center portion has a convex portion of a unique pattern on the outer peripheral surface, and has one or more slits in the axial direction of the main body, and is formed of a hard material. Insert the split mold into the pilot hole of the cylindrical blank cylindrical body having a pilot hole penetrating from one end face to the other end face and formed from a soft material from the opening of the one end face,
Into the inside of the split mold inserted into the blank cylinder from the opening on the one end face, insert a wedge-shaped shaft whose tip is narrowed from the opening on the other end face of the blank cylinder,
By expanding the outer diameter of the split mold by the pushing force of the shaft, a pressure groove for a bearing is plastically worked into the unique pattern by a convex portion that has digged into the inner peripheral surface of the cylindrical blank cylindrical body. The present invention is characterized in that a sleeve cylinder constituting a bearing with a bearing is formed.
[0012]
As a result, the pressure groove can be processed with high precision, and can be efficiently produced in a short time.
[0013]
In addition, except for the portion where the slit of the split mold is formed by shifting the phase by a constant angle, another split mold having the same shape as the split mold is used,
After processing the pressure groove by the split mold, pull out the split mold and the shaft,
Further, the another split mold is inserted into the blank cylinder from the opening on the one end face,
After that, by inserting a wedge-shaped shaft into the blank cylinder from the opening on the other end surface and expanding the outer diameter of the another split mold, the gap between the pressure grooves is formed on the peripheral surface of the blank cylinder. Form a complementary pressure groove by connecting
It is preferable that the pressure groove is formed continuously and integrally.
[0014]
This makes it possible to easily form a continuously integrated pressure groove.
[0015]
Further, the pressure groove may be plastically worked into a required shape by using a plurality of types of split dies in which the shape of the projection is enlarged stepwise.
[0016]
Further, the pressure groove may be plastically worked into a required shape by using a plurality of types of split dies in which the thickness of the convex portion is increased stepwise.
[0017]
This makes it possible to easily and continuously form a deep pressure groove.
[0018]
Further, the present invention is a grooved bearing manufacturing apparatus for rotatably supporting a rotating shaft with a grooved bearing,
A holding portion provided with the blank cylindrical body according to claim 1 or 2,
A working unit in which the split mold according to any one of claims 1 to 4 is disposed to face one end surface of the blank cylindrical body,
A pushing portion in which a wedge-shaped shaft whose tip is narrowed is disposed to face the other end surface of each of the blank cylinders and is movably arranged toward the blank cylinder;
The working unit is moved forward toward the holding unit to press-fit each split mold from one end surface of the blank cylinder, and the pushing unit is moved forward toward the holding unit to move the pressing unit forward. Driving means for pushing the shaft from the other end face into the pushing hole of each split mold,
It is characterized by having.
[0019]
As a result, the pressure groove can be processed with high precision, and can be efficiently produced in a short time.
[0020]
Further, the present invention is a grooved bearing manufacturing apparatus for rotatably supporting a rotating shaft with a grooved bearing,
A holding portion provided with a plurality of the blank cylinders according to claim 1 and 2,
The split mold according to claim 1, wherein the same number of molds having the same shape are provided on each surface of the main body having a polygonal shape and the same number as the number of the blank cylinders, and can be moved toward the holding portion. And a work unit arranged rotatably,
A push-moving portion in which the same number of wedge-shaped shafts with the narrowed ends are arranged as the respective blank cylinders, and are movably arranged toward the holding member from a position opposite to the working portion with respect to the holding portion,
A drive means for moving and rotating these split molds at appropriate timing is provided.
[0021]
Thereby, many pressure grooves of the same shape can be simultaneously formed in the blank body.
[0022]
Further, the driving means includes:
In order to press-fit each split mold from the opening on one end face of the blank cylinder, the working section is moved forward toward the holding section, and each split piece is opened from the opening on the other end face of the blank cylinder. An advancing / retracting mechanism for advancing the pushing portion toward the holding portion to push the shaft into the pushing hole of the mold,
The working part and the pushing part are retracted in accordance with the timing of completion of each working step, and after pulling out the split mold and the shaft, respectively, prior to the forward movement of the working part for pushing in the next split mold. And a rotating mechanism for rotating the working unit by a fixed angle so as to face each of the split molds in the next stage to the blank cylinder.
[0023]
Thereby, a large number of pressure grooves can be simultaneously formed efficiently.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 shows an apparatus for manufacturing a grooved bearing to which the method for manufacturing a grooved bearing according to the present invention is applied. The apparatus for manufacturing a grooved bearing includes a grooved fixing device fixed to a work regulating jig 1. A split mold 3 that is inserted into a prepared pilot hole 20 of a blank cylindrical body (workpiece) 2 serving as a bearing from an opening 22 on one end face, and a blank is formed in the split mold 3 inserted in the blank cylindrical body 2. And a shaft 4 that is pushed in from an opening 23 on the other end surface of the cylindrical body 2.
[0025]
The work regulating jig 1 is for firmly fixing and holding the blank cylindrical body 2 from the outside in a non-rotatable state, and is placed at a fixed position on a worktable (not shown).
[0026]
As shown in FIG. 2, the blank cylinder 2 is formed of a soft material, for example, brass or brass, in a cylindrical shape, and has a pilot hole 20 having a substantially circular cross section penetrating from one end surface to the other end surface. I have. An intermediate groove 21A is engraved in the middle of the inner peripheral surface 24 of the pilot hole 20 of the blank cylindrical body 2 over the entire periphery for relief oil for groove processing or the like. Further, in the portions facing the openings 22 and 23 at both ends of the inner peripheral surface 24 of the prepared hole 20 of the blank cylindrical body 2, a concave portion 21B having substantially the same depth and the same width as the intermediate groove 21A for oil sealing. , 21C are formed. Further, a flange 25 is formed over the entire circumference at an intermediate portion of the outer peripheral surface of the blank cylindrical body 2 in order to fix an object to be rotated.
[0027]
As shown in FIG. 3, the split mold 3A has a substantially cylindrical shape having a large-diameter portion 31A and a small-diameter portion 31B whose main body is formed of a hard material. (3) A push hole 32 having a radius r is formed. In addition, the main body portion has a unique pattern, that is, a convex portion 33 having a herringbone shape (or a helical shape) for forming a dynamic pressure groove on the outer peripheral surface of the small diameter portion 31B. Further, in the main body portion, four slits 34 are formed conformally along the axial direction from a part of the large-diameter portion 31 to the whole of the small-diameter portion 31B (up to the distal end portion), and are formed in the radial direction. Can be displaced.
[0028]
In addition, in this embodiment, as shown in FIG. 4, four such first split molds 3A to 4D split molds 3D are provided, of which the first and second split molds are provided. 3A and 3B, both the outer diameter of the small-diameter portion 31B is D1 and the thickness is t1, but the slits 34 are formed at positions shifted by approximately 45 degrees from each other. I have. On the other hand, in the third and fourth split molds 3C and 3D, the outer diameter of the small diameter portion 31B is D2 (D1 <D2) and the thickness is t2 (t1 <t2), but the slit 34 is formed. Are formed with a phase shift of about 45 degrees from each other.
[0029]
As described above, the outer diameters of the third and fourth split molds 3C and 3D are larger than those of the first and second split molds 3A and 3B, and as shown in FIG. When the same shaft 4 is inserted into the push-in hole 32, a larger press input is applied to the inner peripheral surface of the blank cylinder 2. Further, the thickness d (see FIG. 3) of the third and fourth split molds 3C and 3D is made thicker than that of the first and second split molds 3A and 3B because the thickness of the projection 33 is large. To form a deeper press-fit groove. In addition, these split molds 3A to 3D are formed such that the position of the projection 33 is continuously connected in all the split molds 3A to 3D in a state where the shaft 4 is inserted into the respective push-in holes 32. is necessary.
[0030]
The shaft 4 is formed by forming a pressure groove 2 </ b> A for bearing on the inner peripheral surface of the cylindrical blank cylinder 2 by plastic working, and is a push-in hole of the split mold 3 inserted into the pilot hole 20 of the blank cylinder 2. 34, the inner diameter of the small-diameter portion of the split mold is pushed out by being pushed into the blank cylinder 2 from the opening on the other side, and the tip is tapered. The shaft 4 is formed such that the dimension R from the intermediate portion excluding the distal end portion to the outer diameter portion from the base end portion is larger than at least the inner diameter dimension r of the pushing hole 34 of the split mold 3.
[0031]
Next, a method of manufacturing a grooved bearing using the grooved bearing manufacturing apparatus according to this embodiment will be described.
(1) The blank cylinder 2 is attached to the work regulating jig 1, and the split mold 3 (3A) is inserted into the prepared hole 20 of the blank cylinder 2 shown in FIG.
(2) Next, the wedge-shaped shaft 4 is inserted into the pushing hole 33 on the inner diameter side of the split mold 3 (3A).
[0032]
(3) As a result, as shown in FIG. 5, the push-in hole 33 on the small-diameter portion 31B side of the split mold 3 (3A) is expanded by the shaft 4, and the small-diameter portion 31B of the split mold 3 (3A). The henling-bone-shaped convex portion 33 formed on the outer peripheral surface on the side is pressed against the inner peripheral surfaces 24A and 24B of the prepared hole 20 of the blank cylindrical body 2.
As a result, the projections 33 of the split mold 3 (3A) bite into the inner circumferential surfaces 24A and 24B of the prepared hole inner circumferential surfaces of the blank cylindrical body 2, and the cut inner circumferential surfaces 24A and 24A of the blank cylindrical body 2 The portion 24 </ b> B is engraved in the same groove pattern as the projection 33. That is, the henling bone-shaped pressure groove 2A is plastically worked on the inner peripheral surface of the shaft.
[0033]
(4) When the pressure groove 2A is thus formed on the inner peripheral surface of the blank cylinder 2, the shaft 4 is pulled out and returned, and the split mold 3 (3A) is pulled out.
(5) Next, a similar split mold 3 (3B) shown in FIG. 4B in which the slit 34 is formed with a phase shift of 45 degrees is inserted into the blank cylinder 2 and Then, the wedge-shaped shaft 4 is similarly pushed into the prepared hole 20 and inserted. As a result, the henling-bone-shaped pressure grooves 2A are formed by plastic working at positions where the phase shift of the inner peripheral surface of the blank cylindrical body 2 is shifted by 45 degrees, in other words, over substantially the entire inner peripheral surface of the blank cylindrical body 2. Will be done.
[0034]
(6) Further, as shown in FIGS. 4C and 4D, the third and third split molds 3A and 3B have an outer diameter slightly larger than that of the first and second split molds 3A and 3B, and the third and third split molds 3A and 3B are thick. Similarly, the fourth split molds 3C and 3D are sequentially inserted into the blank cylinder 2, and the corresponding wedge-shaped shafts 4 are similarly pushed into the pilot holes 20 and inserted.
(7) As a result, the pressure grooves 2A on the inner peripheral surface of the blank cylindrical body 2 are gradually formed into an arbitrary shape, for example, in the present embodiment, Since it can be formed in a ring bone shape, it can be processed with high accuracy. The specific pattern (shape) of the pressure groove 2A is not particularly limited to the henling bone shape, but may be, for example, a helical shape as long as the same effect can be obtained for a dynamic pressure type grooved fluid bearing. There may be.
[0035]
[Second embodiment]
Next, a second embodiment according to the present invention will be described with reference to FIG. In this embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.
FIG. 7 shows a second embodiment of a grooved bearing manufacturing apparatus to which the grooved bearing manufacturing method according to the present invention is applied. The grooved bearing manufacturing apparatus includes a holding unit 10 and an operation unit. It includes a unit 30, a pushing unit 40, and a driving unit (not shown).
[0036]
The holding unit 10 is configured so that three (at least two or more) blank cylinders 2 can be simultaneously and easily attached and detached in consideration of work efficiency. In this embodiment, the blank cylinders 2 are mounted. A rectangular column-shaped fixing member 11 having mounting holes for opening at regular intervals, and a plate-like lid member 12 provided on one surface of the fixing member 11 so as to be able to be pressed and crimped and having a hole opened at a portion corresponding to the mounting hole. It is composed of
[0037]
The working unit 30 is disposed so as to face one of the openings 23 of the blank cylinder 2, and the split molds 3 of the first embodiment are arranged in the same number (plurality) of the blank cylinders 2 as a line. Has been established. Specifically, each mounting surface of a quadrangular prismatic (substantially square-shaped) rotating member 35 having first to fourth mounting surfaces 35A to 35D (a fourth mounting surface is not shown in FIG. 7). , Three (at least two or more) identical split dies are fixedly mounted at regular intervals.
[0038]
That is, the first split mold 3A to the fourth mounting surface 3D are fixed to the first mounting surface 35A to the fourth mounting surface, respectively. The working unit 30 can be advanced toward one opening 23 of the blank cylindrical body 2 by a driving means, and is rotated so that each mounting surface sequentially faces the holding unit in accordance with a working step. It is configured.
[0039]
A push member 41 having a push member 40 and a wedge-shaped shaft 4 having a different outer diameter and arranged in a line shape facing the other opening 22 of each blank cylinder 2 is provided. It is arranged so as to be able to advance toward the holding portion 10 by means.
[0040]
The driving unit advances the working unit 30 toward the holding unit 10 in order to push the split mold 3 from one opening 23 of the blank cylinder 2 into the pilot hole 20 prior to processing of each blank cylinder 2. In order to press-fit the shaft 4 into the push hole 33 of each split mold 3 from the other opening 22 of the blank cylindrical body 2 immediately after the forward operation for moving (hereinafter, this operation is referred to as an A operation). Further, there is provided an advancing / retracting mechanism for performing an advancing operation of moving the pushing member 40 toward the holding unit 10 (hereinafter, this operation is referred to as a B operation).
[0041]
Further, as a first processing operation, the driving means performs a processing operation of the pressure groove 2A of the blank cylinder 2 after each split mold, that is, the A operation in the first die 3A and the B operation in the shaft 4. When the operation is performed, subsequently, as a second processing operation, in order to perform the processing operation of the pressure groove 2A of the blank cylindrical body 2 after the next A operation in the second mold 3B and the B operation in the shaft 4, A rotating mechanism is also provided for performing a 90-degree rotating operation of the rotating member 35 of the work 30 (hereinafter, this operation is referred to as C operation).
The C operation is performed in the step of shifting from the first processing operation to the second processing operation, in the step of shifting from the second processing operation to the third processing operation, and in the step of shifting from the third processing operation to the fourth processing operation. Is performed in each step.
[0042]
Next, the operation of this embodiment will be described.
Therefore, according to this embodiment, by performing a series of processing operations for forming a pressure groove in the blank cylinder 2 once, the sleeve cylinders (grooved bearings) can be simultaneously and simultaneously formed from the three blank cylinders 2. Since it can be formed with high precision, high quality products can be efficiently produced in a short time.
[0043]
In this embodiment, the working unit 30 has a configuration including three sets of four types of split molds 3A to 3D. However, the productivity is slightly lower than that of the second embodiment. For example, as shown in FIG. 8, as the working unit 50, a working unit provided with a working member 51 in which a plurality of different types of split dies are sequentially arranged along a processing step only on a single mounting surface may be used. .
[0044]
In this case, the working member 51 is not rotated, and is subjected to a translation operation such that the split mold to be used is sequentially fed toward the blank cylinder 2 in addition to the forward operation. In addition, in accordance with this, the translational operation may be performed so that the pushing portion 40 is similarly extended toward the blank cylinder 2.
[0045]
【The invention's effect】
As described above, in the present invention, a split mold formed of a hard material, having a convex portion of a unique pattern on the outer peripheral surface formed in a substantially cylindrical shape, having one or more slits in the axial direction, Is inserted into the lower hole of the cylindrical blank cylinder formed of a soft material from the opening at one end face, and the tip narrows from the opening at the other end face of the blank cylinder inside the split mold. The wedge-shaped shaft is inserted, and the outer diameter of the split mold is expanded by the pushing force of this shaft, so that the pressure groove for the bearing is plastically formed by the convex part of the split mold that cuts into the inner peripheral surface of the blank cylinder. It is designed to be processed.
[0046]
Therefore, according to the present invention, a pressure groove for a bearing can be processed with high accuracy, and a grooved bearing can be efficiently produced in a short period of time, which leads to cost reduction. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a grooved bearing manufacturing apparatus according to a first embodiment of the present invention.
FIGS. 2A and 2B show a sleeve cylinder used in the grooved bearing manufacturing apparatus according to the first embodiment of the present invention, wherein FIG. 2A is a perspective view and FIG.
FIG. 3 is a perspective view showing one of split dies used in the grooved bearing manufacturing apparatus according to the first embodiment of the present invention.
FIGS. 4A to 4D are explanatory views showing end face shapes of a split mold and the like used in the grooved bearing manufacturing apparatus according to the first embodiment of the present invention.
FIG. 5 is an explanatory diagram illustrating a method for processing and manufacturing a grooved bearing using the grooved bearing manufacturing apparatus according to the first embodiment of the present invention.
FIG. 6 is a cutaway perspective view showing a grooved bearing processed and manufactured by using the grooved bearing manufacturing apparatus according to the first embodiment of the present invention.
FIG. 7 is a schematic configuration diagram showing a grooved bearing manufacturing device according to a second embodiment of the present invention.
FIG. 8 is a schematic configuration diagram illustrating a modified example of the grooved bearing manufacturing device according to the second embodiment.
FIG. 9 is a schematic sectional view showing a configuration of a conventional grooved bearing.
FIG. 10 is a schematic sectional view showing a method for manufacturing a conventional grooved bearing.
[Explanation of symbols]
1 Workpiece regulating jig 2 Sleeve (workpiece)
2A (one) opening surface 2B (other) opening surface 20 pilot hole 21A intermediate groove 21B recess 21C recess 22 opening 23 opening 24 inner peripheral surface 25 flange 3 split mold 3A split mold (first)
3B split mold (second)
3C split mold (third)
3D split mold (4th)
31A Large diameter part 31B Small diameter part 32 Push-in hole 33 Convex part (herringbone shape)
34 slit 4 shaft 10 holding unit 11 fixing member 12 lid member 30 working unit 35 rotating member 35A first mounting surface 35B second mounting surface 35C third mounting surface 35D fourth mounting surface 40 pressing unit 50 operation Part 51 work member

Claims (7)

A method of manufacturing a grooved bearing for rotatably supporting a rotating shaft with a grooved bearing,
The main body formed into a substantially cylindrical shape having a push hole penetrating the center portion has a convex portion of a unique pattern on the outer peripheral surface, and has one or more slits in the axial direction of the main body, and is formed of a hard material. Insert the split mold into the pilot hole of the cylindrical blank cylindrical body having a pilot hole penetrating from one end face to the other end face and formed from a soft material from the opening of the one end face,
Into the inside of the split mold inserted into the blank cylinder from the opening on the one end face, insert a wedge-shaped shaft whose tip is narrowed from the opening on the other end face of the blank cylinder,
By expanding the outer diameter of the split mold by the pushing force of the shaft, a pressure groove for a bearing is plastically worked into the unique pattern by a convex portion that has digged into the inner peripheral surface of the cylindrical blank cylindrical body. A method for manufacturing a grooved bearing, comprising forming a sleeve cylinder constituting a bearing with a groove. Except for the part formed by shifting the slit of the split mold by a constant angle phase, using another split mold having the same shape as the split mold,
After processing the pressure groove by the split mold, pull out the split mold and the shaft,
Further, the another split mold is inserted into the blank cylinder from the opening on the one end face,
After that, by inserting a wedge-shaped shaft into the blank cylinder from the opening on the other end surface and expanding the outer diameter of the another split mold, the gap between the pressure grooves is formed on the peripheral surface of the blank cylinder. Form a complementary pressure groove by connecting
The method for manufacturing a grooved bearing according to claim 1, wherein the pressure groove is formed continuously and integrally. The grooved bearing according to claim 1 or 2, wherein the pressure groove is plastically worked into a required shape by using a plurality of types of split dies in which the shape of the convex portion is enlarged stepwise. Production method. The grooved bearing according to claim 1 or 2, wherein the pressure groove is plastically worked into a required shape by using a plurality of types of split dies in which the thickness of the convex portion is increased stepwise. Manufacturing method. A grooved bearing manufacturing device for rotatably supporting a rotating shaft with a grooved bearing,
A holding portion provided with the blank cylindrical body according to claim 1 or 2,
A working unit in which the split mold according to any one of claims 1 to 4 is disposed so as to face one end surface of the blank cylindrical body,
A pushing portion in which a wedge-shaped shaft whose tip is narrowed is disposed to face the other end surface of each of the blank cylinders and is movably arranged toward the blank cylinder;
The working unit is moved forward toward the holding unit to press-fit each split mold from one end surface of the blank cylinder, and the pushing unit is moved forward toward the holding unit to move the pressing unit forward. Driving means for pushing the shaft from the other end face into the pushing hole of each split mold,
A manufacturing device for a grooved bearing, comprising: A grooved bearing manufacturing device for rotatably supporting a rotating shaft with a grooved bearing,
A holding portion provided with a plurality of the blank cylinders according to claim 1 and 2,
The split mold according to claim 1, wherein the same number of molds having the same shape are provided on each surface of the main body having a polygonal shape and the same number as the number of the blank cylinders, and can be moved toward the holding portion. And a work unit arranged rotatably,
The same number of wedge-shaped shafts each having a tapered tip are arranged as the number of blank cylinders, and the pushing portion, which is movably disposed toward the holding member from a position opposite to the working portion with respect to the holding portion, and A driving device for moving the working unit, rotating the working unit at an appropriate timing, and moving the pushing unit. The driving means,
In order to press-fit each split mold from the opening on one end face of the blank cylinder, the working section is moved forward toward the holding section, and each split piece is opened from the opening on the other end face of the blank cylinder. An advance / retreat mechanism for advancing the pushing portion toward the holding portion to push the shaft into the pushing hole of the mold,
The working part and the pushing part are retracted in accordance with the timing of completion of each working step, and after pulling out the split mold and the shaft, respectively, prior to the forward movement of the working part for pushing in the next split mold. 7. A manufacturing apparatus for a grooved bearing according to claim 6, further comprising: a rotating mechanism for rotating said working portion by a fixed angle to cause each split mold in the next stage to face said blank cylindrical body. .

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