JP4805804B2 - Coated bearing manufacturing method and manufacturing apparatus - Google Patents

Description

  The present invention relates to a coating bearing manufacturing method and manufacturing apparatus for forming a coating layer on a bearing substrate, and in particular, a coating layer is formed on the inner surface of a cylindrical or semi-cylindrical bearing substrate using an application roll. About what to do.

The coating layer of the coated bearing is usually a coating liquid in which a thermosetting resin such as polyamideimide (PAI) or polyimide (PI) is mixed with a solid lubricant such as molybdenum disulfide (MoS ₂ ) or graphite (Gr). The film is formed by applying this coating liquid to the inner surface of the bearing substrate.
As a method for applying the coating liquid as described above to the inner surface of the bearing base, there is a spray method or a printing method. The spray method is a method in which the coating liquid is sprayed from the spray device in the form of a mist and applied to the inner surface of the bearing substrate, and the printing method is a method in which the coating liquid is applied to the inner surface of the bearing substrate using a printing roll. is there.

Patent Document 1 discloses a film forming apparatus for a coating layer using a printing method. This comprises a printing roll and a backup roll with the coating liquid attached to the outer peripheral surface, and when the bearing base material is sandwiched between both rolls and both rolls are rotated, the bearing base material passes between both rolls, In the passing process, the coating liquid of the printing roll is transferred (applied) to the inner surface of the bearing substrate.
JP 2001-304264 A

In the spray method, the film thickness varies greatly, and since the coating liquid is sprayed from the spray device in the form of a mist, the amount of the coating liquid that is wasted due to scattering of the coating liquid is large. In the printing method, the amount of wasted coating liquid as in the spray method can be extremely reduced.
In the printing method disclosed in Patent Literature 1, a bearing base material is sandwiched between a printing roll and a backup roll, and the bearing base material is held by the clamping force. Thus, it cannot be denied that the holding becomes unstable simply by sandwiching and holding the bearing base material between the two rolls. In particular, instability increases when the outer diameter of the bearing base has a claw or the like. For this reason, it is difficult to uniformly apply the coating liquid, and there arises a problem that the variation in the thickness of the coating layer is increased.

  Moreover, the distortion | strain etc. resulting from a process may have arisen in the bearing base material before apply | coating. In such a case, in the printing method that is simply sandwiched between the printing roll and the backup roll and applied, the contact pressure between the printing roll and the inner surface of the bearing substrate is not constant. It is difficult to cause variations in the film thickness of the coating layer.

  In general, the bearing base material is designed to have a size and shape required in a state where it is assembled to a housing such as a connecting rod with a predetermined tightening force. Therefore, in a free state, a coating material that is different from the dimensions and shapes described above in a free state, that is, in a printing method in which the bearing substrate is simply sandwiched between a printing roll and a backup roll, is applied evenly. Even if it is possible, the film thickness of the coating layer may not be uniform in the assembled state.

  Further, in a large bearing used for a marine engine or the like, in order to hold a heavy bearing base material, the printing roll and the backup roll must be strongly pressed against the bearing base material to increase the clamping force. However, if the clamping force between the two rolls is increased, the coating liquid tends to protrude from between the printing roll and the bearing base material, so it is difficult to apply the coating liquid thick at a time, and even more uniformly. Become. This means that the maximum thickness of the coating layer deposited on the bearing substrate depends on the weight of the bearing substrate.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to apply a coating liquid to a bearing substrate using a coating roll, and to apply the coating liquid uniformly. The maximum thickness of the coating layer deposited on the material is not affected by the weight of the bearing base material, and even on large bearing base materials, a uniform thickness is formed efficiently and thickly. An object of the present invention is to provide a coated bearing manufacturing method and a manufacturing apparatus capable of performing the above.

  In order to achieve the above object, in the method of the present invention, the bearing base is attached to a jig, and the coating roll with the coating liquid attached is brought into contact with the inner surface of the bearing base attached to the jig. A coating layer is formed by applying the coating liquid adhering to the coating roll onto the inner surface of the bearing substrate by relatively moving along the inner surface of the bearing substrate while rotating the coating roll. ).

The apparatus of the present invention further includes a jig for attaching the bearing base, a coating roll capable of rotating, and a coating liquid supply means for uniformly adhering the coating liquid to the coating roll. At least one of the jig and the coating roll is provided on the inner surface of the bearing base material in a state where the coating roll is in contact with the inner surface of the bearing base material. The coating roll, which is operably provided so as to move relatively along, is brought into contact with the inner surface of the bearing substrate attached to the jig, and in this contact state, the bearing roll is rotated while rotating. By relatively moving along the inner surface of the base material, the coating liquid adhered to the coating roll is applied to the inner surface of the bearing base material to form a coating layer (Claim 5).
In addition, it is preferable that the axis of rotation of the coating roll in the present invention is parallel to the axis of the bearing base attached to the jig. Further, unlike the printing roll, the coating roll of the present invention can control the rotation speed. It is not intended to exclude those that are not controlled.

  Thus, in the method and apparatus of the present invention, the bearing base material is attached to the jig, so that the bearing base material can be kept in a stable holding state, and the contact pressure of the coating roll on the inner surface of the bearing base material is It is not affected by the weight or size of the substrate. As a result, the coating liquid can be applied uniformly, and the variation in the coating thickness of the coating layer among a large number of coating bearings can be reduced. In addition, the variation in the film thickness can be reduced, and the maximum thickness of the coating layer formed on the bearing base material is not affected by the weight of the bearing base material. It is possible to form a film with a uniform thickness on the material and with a large thickness efficiently. Even if there is a claw or the like on the outer diameter of the bearing base material, there is no problem because the bearing base material can be stably held by attaching the bearing base material to a jig.

  Furthermore, in the present invention, the thickness of the coating layer can be changed by changing the rotation speed of the coating roll (claim 2). This is because the application amount by the application roll with respect to the relative movement distance of the bearing base on the application side can be controlled. The absolute value of the rotation speed of the coating roll is preferably larger than the absolute value of the relative moving speed of the bearing base with respect to the coating roll. This is because a thicker film can be formed more efficiently and the surface of the coating layer can be made smoother, that is, the surface roughness can be made smaller.

The rotation of the coating roll is preferably in the direction opposite to the relative movement direction of the bearing base with respect to the coating roll. Further, it is possible to form a thick film efficiently. Further, the surface of the coating layer can be made smoother.
Moreover, the application range of the coating liquid to a bearing base material can be changed by changing the relative movement range in the contact state of the coating roll with respect to a bearing base material (Claim 4). A coated bearing having a coating layer having a desired thickness at a desired position can be reliably manufactured.
In addition, the thickness of the coating layer is changed by changing the contact pressure of the application roll with respect to the bearing base by providing at least one of the jig and the application roll so as to be movable toward and away from the other. It is also possible.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The coated bearing is a bearing formed by forming a coating layer on the inner surface of a cylindrical or semi-cylindrical bearing substrate. The coating layer is usually composed of a solid lubricant and a resin. In addition, hard particles or the like can be added as necessary. When using a resin with high lubricity, there may be no solid lubricant. As the bearing substrate of the coated bearing, for example, the inner surface of a steel plate back metal is roughened by shot blasting or the like, and a porous metal layer is formed on the inner surface of the back metal by, for example, sintering or spraying a Cu-based alloy. Things are used. The method of the present invention can also be applied to the case where an overlay layer is formed on the surface of a bearing alloy layer for a bearing in which a bearing alloy layer such as an aluminum alloy or a copper alloy is provided on the inner surface of the back metal. In this case, a bearing provided with a bearing alloy layer on the inner surface of the back metal serves as a bearing base material according to the present invention.

As a coating liquid applied to the inner surface of the bearing substrate as a coating layer, generally, a thermosetting resin such as PAI or PI, a solid lubricant such as MoS ₂ or Gr, and a hard particle such as TiO ₂ if necessary A mixture of these is used. As a viscosity of a coating liquid, it is 500-20000 mPa * sec, Preferably it is 1000-10000 mPa * sec.

  FIG. 1 shows the method of the present invention in which a coating liquid is applied to a bearing substrate to form a coating layer. In FIG. 1, for example, a semi-cylindrical (half-split) bearing base material 1 is an application target. In order to apply the coating liquid, a jig 2 and an application roll 3 are prepared. The radius r of the coating roll 3 is preferably set in the range of R / 4 ≦ r <R, where R is the radius of the semicylindrical inner surface of the bearing base 1. A semicircular recess 4 is formed in the jig 2, and the bearing base 1 is held (fixed) on the jig 2 while being fitted in the recess 4.

  On the other hand, the coating liquid is first uniformly spread on the outer peripheral surface of the coating roll 3. The coating roll 3 moves (revolves) along the inner surface of the bearing base 1 while rotating (spinning) in contact with the inner surface of the bearing base 1 fixed to the jig 2. The rotation and revolution of the application roll 3 at this time are relative, and for example, the application roll 3 may revolve while rotating with respect to the stationary bearing base 1. The bearing substrate 1 may revolve with respect to the stationary application roll 3. Furthermore, the coating roll 3 that rotates may revolve and the bearing base 1 fixed to the jig 2 may also revolve.

As will be described later, FIG. 1 shows an example in which the coating roll 3 rotates in a fixed position and the coating roll 3 relatively revolves as the bearing base 1 rotates.
Thus, the coating liquid developed on the outer peripheral surface of the coating roll 3 is applied to the inner surface of the bearing base 1 by relatively revolving along the inner surface of the bearing base 1 while the coating roll 3 rotates. The

The relationship among the rotation direction of the coating roll, the revolution direction of the coating roll, and the revolution direction of the bearing base material held by the jig will be described.
In the present embodiment, the case where the rotation of the coating roll 3 is in the same direction as the relative movement direction of the bearing base 1 with respect to the coating roll 3 is referred to as normal rotation. That is, when the coating roll 3 is in a fixed position, when the rotation direction of the roll 3 and the revolution direction of the bearing base 1 are the same direction, or when the bearing base 1 is in a fixed position, When the rotation direction and the revolution direction of the roll 3 are opposite directions, this is called forward rotation.

A case where the rotation of the coating roll 3 is in a direction opposite to the relative movement direction of the bearing base 1 with respect to the coating roll 3 is referred to as reverse rotation. That is, when the coating roll 3 is in a fixed position, when the rotation direction of the roll 3 and the revolution direction of the bearing base 1 are opposite, or when the bearing base 1 is in a fixed position, When the rotation direction and the revolution direction of the roll 3 are the same direction, it is called reverse rotation.
The rotation speed of the coating roll 3 is the speed on the outer periphery of the coating roll 3. The revolution speed of the coating roll 3 is the moving speed of the contact point between the coating roll 3 and the inner surface of the bearing base 1. The revolution speed of the bearing base 1 held by the jig 2 is the moving speed of the inner surface of the bearing base 1.

Whether forward rotation or reverse rotation, the coating can be satisfactorily applied when the following formula is satisfied.
｜ Bearing base material revolution speed−Coating roll revolution speed | ≦ | Coating roll rotation speed |
At the time of application of this coating liquid, the contact pressure of the application roll 3 with respect to the inner surface of the bearing base 1 is preferably 0 to 1 MPa in order to obtain a more uniform film thickness. The size and weight of the bearing base 1 are not affected. Moreover, the revolution direction of the bearing base material 1 and the revolution direction of the coating roll 3 may be the same direction, or may be opposite directions. The rotation speed of the coating roll 3 is preferably 30 mm / sec on the outer peripheral surface.

  The revolution speed V1 of the bearing base material 1 is preferably | V1 | ≦ | V | ≦ 2 | V1 | in the normal rotation when the rotation speed of the coating roll 3 is V. In the reverse rotation, it is preferable that | V1 | ≦ | V | ≦ 5 | V1 |. The bearing base material 1 on which the coating layer has been formed by applying the coating liquid is then removed from the jig 2 and transferred to a firing process through a drying process. A drying process is performed by heating at 80-100 degreeC. Subsequent firing is performed at 160 to 250 ° C., and the coating layer is cured by firing.

  Now, FIG. 2 shows a coating apparatus 5 for applying a coating liquid using the jig 2 and the application roll 3. As shown in FIG. 2, the coating apparatus 5 is configured by disposing a jig driving device 7, a roll driving device 8, and a droplet liquid device 9 as a coating liquid supply unit on a base 6. ing. The jig driving device 7 includes a rotating shaft 10 whose driving source is a motor capable of speed control and position control. The jig 2 is attached to the rotating shaft 10. In this case, as shown in FIG. 3, the jig 2 is attached so that the arc center of the concave portion 4 coincides with the rotation center of the rotary shaft 10.

  The jig 2 is provided with a holding means for holding (fixing) the bearing base material 1 fitted in the recess 4 so as to press against the inner surface of the recess 4. In the present embodiment, the holding means includes a receiving piece 11 and a pressing piece 12 provided at both circumferential ends of the recess 4 as shown in FIG. The receiving piece 11 is fixed to the jig 2, and the pressing piece 12 is attached to the jig 2 so as to be rotatable about a support shaft 13. The pressing piece 12 presses one end in the circumferential direction of the bearing base material 1 fitted in the recess 4 by its rotation, and the receiving piece 11 receives the other end in the circumferential direction of the pressed bearing base material 1. The rotation of the pressing piece 12 is performed using, for example, a pneumatic cylinder (not shown) as a drive source, and the forward / backward movement of the rod of the pneumatic cylinder is converted into the reciprocating rotation of the pressing piece 12. Has been.

  As shown in FIG. 7, the jig driving device 7 includes a rotation control mechanism 14 and a holding control mechanism 15. Among them, the rotation control mechanism 14 controls the rotation speed and rotation position of a motor (not shown) that is a drive source of the rotation shaft 10. The holding control mechanism 15 controls the advancing / retreating operation of a pneumatic cylinder (not shown) that is a drive source for rotating the pressing piece 12.

  The roll driving device 8 has a main body 16 provided on the base 6 so as to be movable in a direction contacting and separating from the jig driving device 7 and in a direction perpendicular to and contacting the separating device 9. A head 17 is provided on the main body 16 so as to be movable in the vertical direction, and a rotary shaft 18 protrudes from the head 17. The coating roll 3 is attached to the rotary shaft 18. The main body 16 is moved by an XY movement mechanism 19 shown in FIG. The head 17 is moved in the vertical direction by an elevating mechanism 20 shown in FIG. The rotating shaft 18 is driven by a motor (not shown) capable of speed control, and the motor is controlled by a rotation control mechanism 21 shown in FIG.

  As shown in FIG. 4, the droplet liquid device 9 is disposed on the side of the roll driving device 8, and is a rotatable coating liquid roll 22 and a coating liquid nozzle 23 that supplies the coating liquid to the coating liquid roll 22. It has. The coating liquid roll 22 is for uniformly spreading the coating liquid on the outer peripheral surface of the coating roll 3. When the coating liquid is spread on the coating roll 3, as shown in FIG. The liquid roll 22 is moved to a position in contact with the liquid roll 22 from the lateral direction.

  For example, when the compressed air is supplied to the inside, the coating liquid nozzle 23 is configured to be pressurized by the compressed air and to drop an appropriate amount of the coating liquid. The supply of compressed air into the coating liquid nozzle 23 is performed under the control of the pressurization control mechanism 24 shown in FIG. The coating liquid dropped from the coating liquid nozzle 23 is supplied between the coating roll 3 and the coating liquid roll 22 that are in contact with each other and arranged in the lateral direction. When the coating liquid is dropped, the coating roll 3 is rotated and uniformly spread on the outer peripheral surface of the coating roll 3. At this time, the coating liquid roll 22 may or may not be rotated.

  The rotation control mechanism 14 and holding control mechanism 15 of the jig driving device 7, the XY movement mechanism 19 of the roll driving device 8, the elevating mechanism 20 and the rotation control mechanism 21, and the pressurization control mechanism 24 of the droplet liquid device 9 are as follows. 7, the processes from the development of the coating liquid on the coating roll 3 to the formation of the coating layer on the bearing base 1 are executed in order under the control of the central controller 25 shown in FIG.

  Now, the pressing piece 12 of the jig 2 is in the position (release position) shown in FIG. 6A when the bearing base 1 is not held. Then, in order to form a coating layer on the inner surface of the bearing base material 1, the bearing base material 1 is placed in the recess 4 of the jig 2 in which the pressing piece 12 is positioned at the release position as shown in FIG. Insert. When the fitting of the bearing base material 1 into the recess 4 is detected by a sensor (not shown), the central control device 25 issues a holding command to the holding control mechanism 15 of the jig driving device 7. Accordingly, the holding control mechanism 15 operates a pneumatic cylinder (not shown) to rotate the pressing piece 12 in the holding operation direction indicated by the arrow C in FIG. Then, as shown in FIG. 6 (c), the pressing piece 12 presses one end of the bearing base 1, and the bearing base 1 receives the other end into the receiving piece 11 as the one end is pressed. It comes to contact. As a result, the bearing base 1 is brought into a fixed state in which the bearing base 1 is pressed against the jig 2 so as to be in close contact with the inner surface of the recess 4 by the two pieces 11 and 12 (bearing base fixing step).

  On the other hand, the central control device 25 issues a coating liquid development preparation command to the XY movement mechanism 19 and the lifting mechanism 20 of the roll drive device 8. Then, the XY movement mechanism 19 moves the main body 16 toward the liquid drop device 9, and the lifting mechanism 20 moves the head 17 in the vertical direction so that the coating roll 3 is flush with the coating liquid roll 22. Let As a result, the coating roll 3 is moved to a position where it contacts the coating liquid roll 22 from the lateral direction. When a sensor (not shown) detects that the coating roll 3 has come into contact with the coating liquid roll 22 from the lateral direction, the central control device 25 issues a coating liquid supply command to the pressure control mechanism 24 of the droplet liquid device 9 and drives the roll. A coating liquid development command is issued to the rotation control mechanism 21 of the apparatus 8. Then, the pressurization control mechanism 24 of the droplet liquid device 9 supplies compressed air to the coating liquid nozzle 23 to drop an appropriate amount of coating liquid from the coating liquid nozzle 23 (see FIG. 5A) and the roll driving device 8. The rotation control mechanism 21 activates the motor to drive the coating roll 3 to rotate. Thereby, as shown in FIG.5 (b), a coating liquid is uniformly expand | deployed (attached) on the outer peripheral surface of the application | coating roll 3 (coating liquid expansion | deployment process). In FIG. 5B, the developed coating liquid is indicated by a bold line.

  When the coating roll 3 for spreading the coating liquid is rotated for a predetermined time, the central control device 25 then issues a coating preparation command to the XY movement mechanism 19 and the lifting mechanism 20 of the roll driving device 8. Then, the XY movement mechanism 19 moves the main body 16 of the roll driving device 8 in the direction away from the droplet liquid device 9 and moves toward the jig driving device 7, and the rotation center of the coating roll 3 is the jig. The elevating mechanism 20 moves the head 17 in the vertical direction so as to be the same height as the rotation center 2. As a result, as shown in FIG. 1A, the coating roll 3 is placed inside the jig 2 so that the rotation center axis 26 coincides with the rotation center axis 28 of the jig 2 (rotation shaft 10). Be positioned.

  Thereafter, the head 17 is lowered by the elevating mechanism 20, and the application roll 3 is moved to a position where it contacts one end in the circumferential direction of the inner surface of the bearing base 1 as shown in FIG. When the coating roll 3 is moved to a position in contact with the inner surface of the bearing base 1, the central control device 25 issues a coating command to the rotation control mechanisms 14 and 21 of the jig driving device 7 and the roll driving device 8. Thereby, the bearing base material 1 and the coating roll 3 are rotationally driven while contacting with a predetermined load. At this time, the rotation directions of the bearing base 1 and the coating roll 3 may be the same or opposite to each other. For example, when the rotation (autorotation) direction of the application roll 3 is the clockwise direction in FIG. 1, the rotation in the same direction (forward rotation) means that the bearing substrate 1 also rotates in the clockwise direction, and the reverse direction. The rotation (reverse rotation) means that the bearing base 1 rotates in the counterclockwise direction. In this embodiment, the coating roll 3 and the bearing base 1 rotate in the same direction, for example, the coating roll 3 rotates in the direction of arrow D about the rotation center axis 26, and the bearing base 1 rotates about the rotation center axis 28. And rotate in the direction of arrow E.

  The jig 2 is rotated in the direction of arrow E by the coating command, and the coating roll 3 is rotated in the direction of arrow D. The coating roll 3 moves (revolves) relative to the bearing base material 1 along the inner surface by the rotation of the jig 2, so that the coating roll 3 rotates in contact with the inner surface of the bearing base material 1 ( By relatively revolving while being rotated, the coating liquid spread on the outer peripheral surface of the coating roll 3 is applied to the inner surface of the bearing base 1 to form a coating layer. As shown in FIG. 1C, when the bearing base 1 is rotated 180 degrees from the position of FIG. 1A in the direction of arrow E, the application roll 3 is one end in the circumferential direction of the inner surface of the bearing base 1. Therefore, the coating layer is formed on the entire inner surface of the bearing substrate 1 (coating process).

  When the coating layer has been formed on the bearing substrate 1, the central control device 25 sends a return command to the rotation control mechanism 14 of the jig driving device 7, the lifting mechanism 20 of the roll driving device 8, and the XY movement mechanism 19. give. Thereby, the elevating mechanism 20 raises the head 17 to move the coating roll 3 to a position concentric with the jig 2 (position shown in FIG. 1A), and then the XY moving mechanism 19 is moved to the main body 16. Is moved to the original position beside the drop device 9. Further, the jig 2 is further rotated in the direction of the arrow E as shown in FIG. 1D, and finally returns to the original position shown in FIG.

  When the main body 16 of the roll driving device 8 returns to the original position, the central control device 25 issues a holding release command to the holding control mechanism 15 of the jig driving device 7. As a result, the holding control function 15 of the jig driving device 7 operates the pneumatic cylinder to rotate the pressing piece 12 in the direction opposite to the arrow C shown in FIG. 6 to return to the original release position. As a result, the bearing base material 1 is released from the fixture 2 and removed. The bearing base material 1 removed from the jig 2 is then conveyed to a drying furnace and a firing furnace in order, and the coating layer is dried (drying process) and fired (firing process).

  As described above, according to the present embodiment, the bearing substrate 1 is fixed in a state where it is pressed against the inner surface of the recess 4 of the jig 2 and the coating liquid is applied. For this reason, when the bearing base material 1 is distorted, the coating liquid is applied by the application roll 3 in a state where the distortion is corrected and the inner surface thereof is close to a perfect circle, so that the film thickness of the coating layer is uniform. Thus, the variation in the thickness of the coating layer between the portions of one bearing base material 1 can be reduced, and the variation in the thickness of the coating layer between the individual bearing base materials 1 can be reduced. Can do.

In order to confirm the effect of the present invention, the present inventor performed a coating layer on the inner surface of a semi-cylindrical bearing substrate by the method of the present invention, the conventional spray method, and the conventional printing method disclosed in Patent Document 1. After that, a sample was manufactured by drying and baking. As the coating liquid, two kinds of coating liquid A and coating liquid B were used. The coating liquid A was a mixture of PAI and MoS ₂ , and the coating liquid B was a mixture of PAI and Gr. The viscosity of the coating liquid was adjusted to 85 mPa · sec for both the coating liquid A and the coating liquid B during the spray method, and to 1200 mPa · sec for the coating liquid A and 4600 mPa · sec for the coating liquid B when using the conventional printing method and the present invention. .

  The coating layer is formed by the method of the present invention when the coating roll is rotated in the same direction as the rotation direction of the bearing substrate by the jig (referred to as roll (positive), that is, forward rotation). The application roll was rotated in two ways (in the case of rotating in the direction opposite to the rotation direction of the bearing substrate by the jig (referred to as roll (reverse), that is, reverse rotation)). The application roll was rotated at an absolute value of the outer peripheral speed of 30 mm / sec in both forward and reverse rotations, and the bearing base was rotated at the inner peripheral speed of 30 mm / sec. Accordingly, when the coating roll rotates in the same direction as the bearing base, the relative speed between the two is 0, and when the coating roll rotates in the opposite direction to the bearing base, the absolute value of the relative speed between them is 60 mm. / Sec.

  In the spray method, two bearing base materials are incorporated into a jig in a cylindrical shape, preheated to 80 to 100 ° C., and then sprayed inside the two cylindrical bearing base materials. The coating liquid was sprayed from the spray while rotating the bearing substrate to form a coating layer on the inner surface of the bearing substrate. Then, the bearing base material was removed from the jig, and the coating layer was baked at 160 to 250 ° C.

  In the conventional printing method, after the coating liquid is uniformly spread on the surface of the coating roll, the coating roll is brought close to the backup roll, the bearing base material is inserted into the gap between the two rolls, and both rolls are rotated. At this time, the bearing substrate is fed in the same direction as the rotation direction of the coating roll by both rolls in a free state, and a coating layer is formed in the process. Thereafter, the bearing substrate was heated to 80 to 100 ° C. to dry the coating layer, and then the coating layer was baked at 160 to 250 ° C.

  The number of samples manufactured by the above three methods was 50 for each method. And about the sample, the thickness (film thickness) of the coating layer of several parts one by one, and the surface roughness of the coating layer were measured. The average value and the deviation value were obtained for the measured values, and the following Table 1 and Table 2 were prepared.

  Specifically, Table 1 shows a case where a coating layer having a thickness of 5 μm is obtained using the coating liquid A, and Table 2 shows a case where a coating layer having a thickness of 20 μm is obtained using the coating liquid B. . In Tables 1 and 2, the spray method and the conventional printing method are shown as comparative examples, and the method of the present invention is shown as an example. In Tables 1 and 2, (a) is the average film thickness and standard deviation of 50 samples for each method regarding the film thickness at the same location of the sample (see P in FIG. 8), and (b) is the individual sample. The average value of the average film thickness of each part of each of the 50 samples and the average value of the standard deviation of each part, (c) is the film thickness of a plurality of parts (5 points, see P1 to P5 in FIG. 9). The average value and standard deviation of 50 methods for the surface roughness of the sample.

  Here, the standard deviation indicates a variation in the measured value. That is, in general, 95% of all experimental data falls within the range of (average value ± 1.96 δ). However, in each method, when δ including 95% of measured values of 50 materials is calculated, δ was a standard deviation.

  From the above Tables 1 and 2, in the method of the present invention, the coating layer can be formed to a thickness closer to the target thickness, and the film thickness between the parts of one bearing base material and between many bearing base materials Thus, the superiority of the method of the present invention for the formation of a uniform coating layer is understood.

  By the way, in this invention, a coating liquid is apply | coated with an application roll in the state which fixed the bearing base material to the jig | tool. For this reason, while being able to set freely the speed with respect to the bearing base material of an application roll, the contact pressure with respect to the bearing base material of an application roll can be set freely. In the present invention, the thickness of the coating layer can be positively changed by the speed of the coating roll with respect to the bearing base material and by the contact pressure of the coating roll with respect to the bearing base material.

  Table 3 below shows the result of measuring the thickness of the coating layer when the coating liquid B was used and the rotation speed and direction of the coating roll were changed. Table 4 shows the results of measuring the film thickness of the coding layer when the pressure applied to the bearing substrate of the coating roll is changed using the coating liquid B. In Table 3, the absolute value of the rotation speed of the coating roll is 30, 45, 60 mm / sec, and the rotation speed of the bearing base is 30 mm / sec. In Table 4, the absolute value of the rotation speed of the coating roll. Is 30 mm / sec, and the rotation speed of the bearing substrate is 30 mm / sec.

  From Table 3 above, in either case of roll (forward) or roll (reverse), the faster the rotation speed of the coating roll, the thicker the coating layer can be made by carrying out one coating process. Even if the speed is the same, the roll (reverse) can form a thicker coating layer than the roll (forward). In other words, the faster the relative rotation speed of the coating roll relative to the bearing substrate, the thicker the coating layer. It is understood that it can be done.

On the other hand, it can be seen from Table 4 that in the case of a roll (positive), the thickness of the coating layer can be reduced as the pressing load of the application roll on the bearing substrate is larger (the contact pressure is higher). In the case of a roll (reverse), it can be seen that the influence of the pressing load on the film thickness is small.
Further, in the manufacturing method according to the present invention, when the coating liquid is applied, the circumferential position of the bearing base 1 when the coating roll 3 is brought into contact with the bearing base 1 and when the coating roll 3 is separated (the revolution range in the contact state). ) Can be changed, the range in which the coating layer is formed can be set to a desired range.

The present invention is not limited to the above-described embodiments and examples shown in the drawings, and can be expanded or changed as follows.
The holding means for holding the bearing base material 1 on the jig 2 is not limited to one constituted by the receiving piece 11 and the pressing piece 12.
The spreading means for spreading the coating liquid on the outer peripheral surface of the coating roll 3 is not limited to the coating liquid roll 22 and may be a blade.
The roll driving device 8 may be fixed, and the jig driving device 7 and the droplet liquid device 9 may be moved with respect to the roll driving device 8.
In attaching the bearing base material to the jig, the configuration is not limited to the configuration in which one bearing base material is attached to one jig, and two or more bearing base materials may be attached to one jig. . For example, two or more bearing base materials are arranged in the axial direction and attached to one jig. It can be applied to many bearing substrates at once.
After the bearing base material fixing step, the bearing base material 1 may be removed from the jig 2 after performing the coating liquid spreading step and the coating step a plurality of times. Both forward rotation and reverse rotation can be performed in a single coating process. The coating layer can be formed at a desired thickness on the bearing substrate at a desired thickness. Further, if reverse rotation is performed in the final coating step, the coating layer can have a smaller surface roughness.

The front view for showing one embodiment of the present invention and explaining the application method of a coating liquid Schematic side view of coating liquid application equipment Sectional view seen from the arrow direction of the AA line of FIG. Sectional view seen from the arrow direction of the BB line of FIG. Front view showing adhesion of coating liquid to application roll by drop device Front view showing attachment of bearing base material to jig Block diagram showing control configuration Diagram showing measurement points of bearing base material Diagram showing measurement points of bearing base material

Explanation of symbols

  In the drawings, 1 is a bearing substrate, 2 is a jig, 3 is a coating roll, 4 is a recess, 5 is a coating device, 7 is a jig driving device, 8 is a roll driving device, and 9 is a drop device (coating solution supply). Means), 22 is a coating liquid roll, and 23 is a droplet nozzle.

Claims (5)

In a coated bearing manufacturing method in which a coating liquid is formed by applying a coating liquid on the inner surface of a cylindrical or semi-cylindrical bearing base,
The bearing base is attached to a jig,
Apply the coating liquid to the coating roll,
Contacting the coating roll with the coating liquid attached to the inner surface of the bearing substrate attached to the jig;
In this contact state, by relatively moving along the inner surface of the bearing base material while rotating the application roll, the coating liquid adhered to the application roll is applied to the inner surface of the bearing base material, and A method for producing a coated bearing, comprising forming a coating layer.   The coated bearing manufacturing method according to claim 1, wherein the thickness of the coating layer is changed by changing a rotation speed of the coating roll when the coating liquid is applied to the bearing base material.   The coated bearing manufacturing method according to claim 1 or 2, wherein the rotation of the coating roll is in a direction opposite to a relative movement direction of the bearing base with respect to the coating roll.   4. The application range of the coating liquid to the inner surface of the bearing base material is changed by changing a relative movement range of the coating roll in contact with the bearing base material. The coated bearing manufacturing method in any one. In a coating bearing manufacturing apparatus that forms a coating layer by applying a coating liquid on the inner surface of a cylindrical or semi-cylindrical bearing substrate,
A jig for attaching the bearing base;
An application roll;
A coating liquid supply means for uniformly adhering the coating liquid to the coating roll;
While providing at least one of the jig and the coating roll movably in the direction of contacting and separating the other,
At least one of the jig and the coating roll is operably provided so as to relatively move along the inner surface of the bearing substrate in a state where the coating roll is in contact with the inner surface of the bearing substrate;
The coating roll to which the coating liquid is attached is brought into contact with the inner surface of the bearing base material attached to the jig, and in this contact state, the coating roll is rotated while rotating relative to the inner surface of the bearing base material. The coated bearing manufacturing apparatus, wherein the coating liquid is applied to the inner surface of the bearing base material to form the coating layer.

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