JP4821989B2 - Fine recess processing apparatus and fine recess processing method - Google Patents

Description

  The present invention relates to a fine recess processing apparatus and a fine recess processing method, and more specifically, for example, an inner peripheral surface of a cylinder bore of a cylinder block in an automobile engine, a journal portion of a camshaft, and an outer peripheral surface of a piston. Fine recessed part processing apparatus and fine recessed part used to form fine recessed parts (oil sump) for realizing low friction on a circumferential surface such as an inner peripheral surface and an outer peripheral surface of a workpiece with sliding contact It relates to a processing method.

Conventionally, a processing apparatus and a processing method have been proposed in which a roller having irregularities on the outer peripheral surface is pressed into a workpiece with a predetermined load, the workpiece is rotated, and fine irregularities are formed on the workpiece surface ( (See Patent Document 1).
JP 2002-361351 A

However, the contact state (surface pressure) between the foam roller and the workpiece changes due to wear of the protrusions provided on the outer peripheral portion of the foam roller, and the processing depth of the fine shape to be processed may vary. there were.
Similarly, due to variations in the hardness of the workpiece, variations may occur in the processing depth of the fine shape to be processed.
Conventionally, the processing depth is measured by using a roughness meter or a non-contact type three-dimensional measuring device after processing, and the processing depth generated for the above reasons. It took a great deal of time to judge the variation of.

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to achieve a fineness capable of suppressing variations in machining depth due to variations in tool wear and workpiece hardness. An object of the present invention is to provide a recess processing apparatus and a fine recess processing method.

  The inventors of the present invention have made extensive studies in order to achieve the above object, and applied a load to the roller support member by the load applying means so that the convex portion of the foam roller is pressed against the circumferential surface of the work piece. By rolling the foam roller pressed against the circumferential surface of the work piece along the circumferential surface, the circumferential surface is formed according to the data input from the slip detection means when forming a fine recess on the circumferential surface. The present inventors have found that the above object can be achieved by forming fine concave portions while changing the pressure contact load of the foam roller with respect to the load control means, and have completed the present invention.

  That is, the fine concave portion processing apparatus of the present invention is a fine concave portion processing device that forms fine concave portions on the circumferential surface of a workpiece, and the foam roller having convex portions for forming concave portions and the foam roller can be rotated. A roller support member for supporting, a tool holder for holding the roller support member in a state in which the central axis of the circumferential surface and the rotation axis of the foam roller are parallel, and applying a load to the roller support member to The load applied by the foam roller to the circumferential surface is changed according to the data input from the load application unit that presses against the circumferential surface, the slip detection unit that detects the slip between the foam roller and the workpiece, and the slip detection unit. Load control means to be provided.

  The fine recess processing method of the present invention is a processing method for forming fine recesses on the circumferential surface of a workpiece using the micro recess processing apparatus of the present invention, and is applied to the roller support member by a load applying means. The convex roller is pressed against the circumferential surface of the workpiece, and the foam roller that is pressed against the circumferential surface of the workpiece is rolled along the circumferential surface. In forming the fine concave portion on the surface, the fine concave portion is formed while changing the pressure contact load of the foam roller with respect to the circumferential surface by the load control means according to the data inputted from the slip detecting means.

  Furthermore, the sliding member, crankshaft, camshaft, balancer shaft, piston pin, and cylinder block of the present invention each have a fine recess formed on the circumferential surface, and a journal and cam lobe formed with a fine recess on the circumferential surface. It is characterized by having at least one, having a journal having a minute recess formed on the circumferential surface, having a minute recess formed on the circumferential surface, and having a cylinder bore having a minute recess formed on the circumferential surface. To do.

  According to the present invention, there is provided a foam roller in which a load is applied to the roller support member by the load applying means so that the convex portion of the foam roller is brought into pressure contact with the circumferential surface of the workpiece, and is brought into pressure contact with the circumferential surface of the workpiece. By rolling along the circumferential surface, when the fine recess is formed on the same circumferential surface, the pressure load of the foam roller against the circumferential surface is changed by the load control means according to the data input from the slip detection means. However, since the fine recesses are formed, it is possible to provide a fine recess processing apparatus and a fine recess processing method capable of suppressing variations in machining depth due to tool wear and workpiece hardness variations.

Hereinafter, the fine recess processing apparatus of the present invention will be described in detail.
As described above, the fine concave portion processing apparatus of the present invention is a fine concave portion processing device that forms fine concave portions on the circumferential surface of a workpiece, and rotates a foam roller having convex portions for forming concave portions and the foam roller. A roller support member that freely supports, a tool holder that holds the roller support member in a state in which the central axis of the circumferential surface and the rotation axis of the foam roller are parallel, and a foam is applied by applying a load to the roller support member A load applying means for pressing the roller against the circumferential surface, a slip detecting means for detecting slip between the foam roller and the workpiece, and a pressure load of the foam roller against the circumferential surface by data input from the slip detecting means. And a load control means that changes the depth of machining due to tool wear and workpiece hardness variations.

  In the fine recess processing apparatus of the present invention, the workpiece and the tool holder further have a rotation mechanism that can rotate relatively around the central axis of the circumferential surface, and the slip detection means includes the tangential direction of the foam roller. In this way, variation in machining depth due to tool wear and workpiece hardness variation can be suppressed.

  Furthermore, in the fine recess processing apparatus of the present invention, the slip detection means provided can measure a difference in rotational speed between the foam roller and the work piece, whereby tool wear and work piece hardness can be measured. It is possible to suppress the variation in the processing depth due to the variation in. In addition, since the slip detection speed is high, the processing depth can be determined in-process, and variations in the processing depth can be further suppressed.

  Further, in the fine recess processing apparatus of the present invention, the slip detection means provided can measure the strain of the roller support member, whereby the processing depth due to tool wear and workpiece hardness variation can be measured. Variations in thickness can be suppressed. Further, since the detection of slip can be detected from the distortion of the roller maintaining member, there is an advantage that the apparatus configuration can be simplified.

  Further, in the fine recess processing apparatus of the present invention, the slip detection means provided can measure the torque fluctuation of the work piece, thereby processing due to tool wear and work piece hardness variation. Variation in depth can be suppressed. Moreover, since the detection of slip can be detected from the torque of the workpiece, there is an advantage that the apparatus configuration can be simplified.

  Furthermore, in the fine recess processing apparatus according to the present invention, the slip detection means provided can measure the distance between two or more fine shapes after processing, whereby tool wear and workpieces can be measured. Variation in processing depth due to variation in hardness can be suppressed. Further, since the slip can be detected from the distance between the fine shapes after processing, there is an advantage that the apparatus configuration can be simplified.

  Further, in the fine recess processing apparatus of the present invention, the load control means provided with the load control means calculates the average value of the slip between the foam roller and each work piece inputted from the slip detection means, and the circle of the next work piece is calculated. Since it is possible to change the pressure contact load of the foam roller with respect to the peripheral surface, it is possible to further reduce variations in processing depth and pattern between the workpieces.

  Furthermore, in the fine recess processing apparatus of the present invention, the load control means provided with the load control means calculates the average value of the slip for one rotation between the foam roller and the work input from the slip detection means, Since the pressure contact load for the next rotation of the foam roller with respect to the circumferential surface can be changed, it is possible to further reduce variations in processing depth and pattern in one workpiece.

  Furthermore, in the fine recess processing apparatus of the present invention, the load control means includes a circumferential surface of the workpiece so that the slip between the foam roller and the workpiece input from the slip detection means is constant. Since the pressure contact load of the foam roller can be changed, the variation in processing depth and pattern can be further reduced.

  Further, in the fine recess processing apparatus of the present invention, the foam is detected from the change in the slip between the foam roller and the workpiece input from the slip detection means or the change in the pressure load of the foam roller against the circumferential surface of the workpiece. It is also possible to further include a wear judging means for judging the wear of the roller, so that it is possible to judge the wear of the foam roller without directly measuring the foam roller, thereby omitting the inspection process of the foam roller. However, there is an advantage that the foam roller can be used up to the life limit.

  Furthermore, the fine recessed portion machining apparatus of the present invention may further include a breakage judging means for judging breakage of the foam roller from a change in slip between the foam roller and the workpiece inputted from the slip detecting means. It is possible to determine whether or not the foam roller is broken without directly measuring the foam roller, thereby reducing the occurrence of defective products due to sudden breakage of the foam roller.

Next, the fine recess processing method of the present invention and the sliding member obtained thereby will be described in detail.
As described above, the fine recess processing method of the present invention is a processing method for forming fine recesses on the circumferential surface of a workpiece using the micro recess processing apparatus of the present invention, and a roller support member by a load applying means. By applying a load to the convex portion of the foam roller to press against the circumferential surface of the workpiece, and rolling the foam roller pressed against the circumferential surface of the workpiece along the circumferential surface. In forming a fine concave portion on the circumferential surface, a processing method for forming the fine concave portion while changing the pressure contact load of the foam roller with respect to the circumferential surface by the load control means according to data input from the slip detecting means, for example, A sliding member having a desired fine recess, a crankshaft, a camshaft balancer shaft, a piston pin, a cylinder block, or the like can be manufactured.
By adopting such a configuration, it is possible to detect changes in the machining depth without measuring the groove depth after machining, so the quality of the machining depth can be obtained without measuring the machining depth after machining. Can be managed. In other words, the quality can be managed by sampling inspection without inspecting the total number of processed products.
For the quality of the machining depth, for example, the relationship between the machining depth and the slip is obtained in advance through experiments, etc., and the slip that becomes the quality limit of the machining depth is obtained from the result, and that value is set as the limit value of the slip. You can manage it.
In addition, variations in machining depth due to tool wear and workpiece variation (shape, hardness, etc.) can be corrected.
And the fine recessed part formed with such a processing method becomes a lubricating oil pool, and since the flow of lubricating oil can be controlled efficiently, the friction of a sliding member can be reduced.
In addition, a crankshaft having at least one of a journal and pins having fine recesses on the circumferential surface, a camshaft having at least one of a journal and cam lobes having fine recesses on the circumferential surface, and forming minute recesses on the circumferential surface The same effect can be obtained in a balancer shaft having a journal, a piston pin having a fine recess formed on the circumferential surface, and a cylinder block having a cylinder bore having a fine recess formed on the circumferential surface.

  EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to these Examples.

(Example 1-1)
FIG. 1 is an explanatory view showing the configuration of the first embodiment of the fine recess processing apparatus of the present invention. As shown in the figure, a workpiece W held so as to be rotatable about a rotation axis perpendicular to the figure is held. And the fine recessed part processing apparatus of this example has a fine projection on the outer peripheral part which is an example of the foam roller 10 having a convex part for forming a recessed part, and a cylindrical foam roller 12 made of a high hardness member, The roller support member 20 is configured so that the arm 22 as an example of the roller support member 20 that rotatably supports the foam roller 12, and the center axis of the circumferential surface of the workpiece W are parallel to the rotation axis of the foam roller 12. A body 32 that is an example of a tool holder 30 that holds a load application unit 40 that will be described later and a load detector 50 that detects a load generated by the load application unit 40 and is movable in the X, Z, and C directions in the drawing. And an elastic body (for example, a spring) 42 that is an example of a load applying means 40 that applies a load to the roller support member 20 and presses the foam roller 12 against the circumferential surface with a predetermined load. A sliding member that measures the tangential force of the supporting roller 60 that supports the supporting member 20 in a substantially horizontal direction, and a slip detecting means 70 that is an example of slip detecting means 70 that detects slip between the forming roller 12 and the workpiece W. And a detector 71.
Further, load control means for changing the pressure contact load of the foam roller 12 with respect to the circumferential surface by data input from the slip detection means 70 is further provided.
The load detector constitutes a part of the load control means.

FIG. 2 is a flowchart showing an embodiment of a fine recess processing method using the fine recess processing apparatus of this example. As shown in the figure, first, in Step 101 (hereinafter abbreviated as “S101”), a workpiece is attached to a fine recess processing apparatus.
Next, in S102, processing conditions such as a limit value of the slip value, correlation data of the slip and load, tool life load, processing load, processing speed and processing range are input.
Here, the “slip value” means a load measured by a slip detector in this example. Further, the slip value (coefficient of friction) and the pressing load when the machining depth is made constant have a correlation as shown in FIG. FIG. 3 is a graph showing the relationship between the slip value (friction coefficient) and the pressure load when the machining depth is constant. Such correlation data is obtained by conducting preliminary experiments in advance together with the limit value of the slip value and the tool life load.

Next, in S103, the foam roller is moved directly above the workpiece.
Next, in S104, the foam roller is moved in the Z direction and is brought into pressure contact with the workpiece.
At this time, since the foam roller is pressed through a load applying means composed of an elastic body such as a spring, even if the shape of the workpiece is slightly deformed, it is pressed against the workpiece with a substantially constant pressure load. .

  Next, in S105, it is determined whether or not the pressure contact load is the processing load input in S102. If YES, the process proceeds to S106.

In S106, the movement of the foam roller in the Z direction is stopped, the workpiece is rotated, and feeding of the foam roller in the direction of the rotation axis of the workpiece is started.
Next, in S107, the measurement and recording of the slip value are started by the slip detector.
At this time, measurement and recording are always performed by a slip detector during processing.

  Next, in S108, it is determined whether or not the entire processing range has been processed. If YES, the process proceeds to S109.

In S109, the average value of the slip values measured by the slip detector is calculated.
Next, in S110, it is determined whether or not the average value of the slip value is equal to or less than the limit value of the slip value input in S102. If YES, the process proceeds to S111.

In S111, the processed workpiece is taken out.
Next, in S112, processing of the next workpiece is started.

  On the other hand, in S105, it is determined whether or not the pressure contact load is the machining load input in S102. If NO, the process proceeds to S104.

  In S108, it is determined whether or not the entire processing range has been processed. If NO, the process proceeds to S106.

  Further, in S110, it is determined whether or not the average value of the slip value is equal to or less than the limit value of the slip value input in S102. If NO, the process proceeds to S113.

In S113, a load correction value is calculated from the correlation data between the slip and the load, and the machining load is corrected.
Next, in S114, it is determined whether the corrected machining load is equal to or less than the tool life load. If YES, the process proceeds to S111.

  Furthermore, in S114, it is determined whether or not the corrected machining load is equal to or less than the tool life load. If NO, it is determined that the wear of the foam roller has been remarkably increased, and the process proceeds to S115.

  In S115, the foam roller is replaced, and the corrected processing load is corrected to the initial processing load.

When a sudden change as shown in FIG. 4 is detected from the recorded slip value, it is determined that a minute convex portion on the outer peripheral portion of the foam roller has been damaged, although it is not shown in the figure. The foam roller may be replaced.
In this case, the foam rollers may be replaced when the number of damaged convex portions is integrated and the predetermined number is reached.

In addition, with such a processing method, it is also possible to manage variations in the processing depth due to foam roller wear and changes in hardness between workpieces. By controlling the processing depth, it is possible to manage variations in the processing depth without having to measure all of the processed fine recesses after processing, and sampling inspection is required, but the process of measuring the parts after processing is required. It can be omitted.
Furthermore, the variation in processing depth can be reduced to a predetermined variation or less. Furthermore, the wear of the foam roller can be determined without directly measuring the foam roller, the foam roller measurement process can be omitted, and the foam roller can be used up to the tool life limit.

(Example 1-2)
FIG. 5 is an explanatory view showing the configuration of the second embodiment of the fine recess processing apparatus of the present invention. As shown in the figure, the fine recess processing apparatus of the present example is substantially the same as the fine recess processing apparatus of the first embodiment, but slip detection means 70 for detecting the slip between the foam roller 12 and the workpiece W. Instead of the slip detector 71 for measuring the tangential force of the foam roller 12, a rotational speed detector 72 for measuring the rotational speed difference between the foam roller 12 and the workpiece W is provided, and the foam roller 12 and the workpiece are processed. The slip can be detected by measuring the peripheral speed difference of the object W. Here, the sliding speed is calculated by Vw−Vt.

(Example 1-3)
FIG. 6 is an explanatory view showing the configuration of the third embodiment of the fine recess processing apparatus of the present invention. As shown in the figure, the fine recess processing apparatus of the present example is substantially the same as the fine recess processing apparatus of the first embodiment, but slip detection means 70 for detecting the slip between the foam roller 12 and the workpiece W. In place of the slip detector 71 that measures the tangential force of the foam roller 12, a strain gauge 73 that measures strain in the tangential direction of the workpiece W of the roller support member 20 is provided. Slip can be detected by measuring the distortion in the tangential direction of the workpiece W.

(Example 1-4)
FIG. 7 is an explanatory view showing the configuration of the fourth embodiment of the fine recess processing apparatus of the present invention. As shown in the figure, the fine recess processing apparatus of the present example is substantially the same as the fine recess processing apparatus of the first embodiment, but slip detection means 70 for detecting the slip between the foam roller 12 and the workpiece W. As an alternative to the slip detector 71 that measures the tangential force of the foam roller 12, a sensor that measures the rotational torque fluctuation of the workpiece W (not shown) is provided, and the rotational torque fluctuation of the workpiece is measured, Slip can be detected.

(Example 1-5)
FIG. 8A is an explanatory view showing the configuration of the fifth embodiment of the fine recess processing apparatus of the present invention. As shown in the figure, the fine recess processing apparatus of the present example is substantially the same as the fine recess processing apparatus of the first embodiment, but slip detection means 70 for detecting the slip between the foam roller 12 and the workpiece W. In place of the slip detector 71 that measures the force in the tangential direction of the foam roller 12, a machining shape measuring device 75 that measures the distance between two or more fine shapes after machining is provided. It is possible to detect the slip by measuring the distance. In addition, the same figure (b) is explanatory drawing which shows the mode of the fine shape actually processed.

(Example 2)
Also in this example, the fine recessed part was formed in the circumferential surface of a workpiece using the same fine recessed part processing apparatus as Example 1-1.
FIG. 9 is a flowchart showing another embodiment of the fine recess processing method using the fine recess processing apparatus of this example. As shown in the figure, first, in S201, the workpiece is attached to the fine recess processing apparatus.
Next, in S202, processing conditions such as slip-load correlation data, processing load, processing speed, and processing range are input.
Next, in S203, the foam roller is moved directly above the workpiece.
Next, in S204, the foam roller is moved in the Z direction and is brought into pressure contact with the workpiece.
Next, in S205, it is determined whether or not the pressure contact load is the processing load input in S202. If YES, the process proceeds to S206.

In S206, the movement of the foam roller in the Z direction is stopped, the workpiece is rotated, and the feed of the foam roller in the direction of the rotation axis of the workpiece is started.
Next, in S207, the slip detector starts measuring and recording the slip value.
At this time, measurement and recording are always performed by a slip detector during processing.

  Next, in S208, it is determined whether or not the entire processing range has been processed. If YES, the process proceeds to S209.

In S209, the average value of the slip values measured by the slip detector is calculated, and the difference from the average value of the slip values in the immediately preceding workpiece is further calculated.
Next, in S210, a load correction value is calculated from the correlation data between the slip and the load, and the machining load is corrected.
Next, in S211, the processed workpiece is taken out.
Next, in S212, processing of the next workpiece is started.

  Further, in S205, it is determined whether or not the pressure contact load is the processing load input in S202. If NO, the process proceeds to S204.

  Further, in S208, it is determined whether or not the entire processing range has been processed. If NO, the process proceeds to S206.

  By such a processing method, it is possible to process a fine shape with less processing depth and pattern variation between processed workpieces.

(Example 3)
Also in this example, the fine recessed part was formed in the circumferential surface of a workpiece using the same fine recessed part processing apparatus as Example 1-1.
FIG. 10 is a flowchart showing still another embodiment of the fine recess processing method using the fine recess processing apparatus of this example. As shown in the figure, first, in S301, the workpiece is attached to the fine recess processing apparatus.
Next, in S302, processing conditions such as a processing load, a processing speed, and a processing range are input.
Next, in S303, the foam roller is moved directly above the workpiece.
Next, in S304, the foam roller is moved in the Z direction and is brought into pressure contact with the workpiece.
Next, in S305, it is determined whether or not the pressure contact load is the processing load input in S302. If YES, the process proceeds to S306.

In S306, the movement of the foam roller in the Z direction is stopped, the workpiece is rotated, and the feed of the foam roller in the direction of the rotation axis of the workpiece is started.
In step S307, the slip detector starts measuring and recording the slip value.
At this time, measurement and recording are always performed by a slip detector during processing.

  Next, in S308, it is determined whether or not the slip value has changed. If YES, the process proceeds to S309.

  In S309, it is determined whether or not the slip value has increased. If YES, the process proceeds to S310.

In S310, the pressure contact load is decreased.
Next, in S311, it is determined whether or not the entire processing range has been processed. If YES, the process proceeds to S312.

In S312, the processed workpiece is taken out.
Next, in S313, processing of the next workpiece is started.

  In S305, it is determined whether or not the pressure contact load is the processing load input in S302. If NO, the process proceeds to S304.

  Further, in S308, it is determined whether or not the slip value has changed. If NO, the process proceeds to S311.

  In S309, it is determined whether or not the slip value has increased. If NO, the process proceeds to S314.

  In S314, the pressure contact load is increased.

  Further, in S311, it is determined whether or not the entire processing range has been processed. If NO, the process proceeds to S306.

  By such a processing method, that is, by controlling the pressure contact load so that the slip value becomes constant and performing this until a fine recess is formed in the entire processing range, the processing depth can be adjusted within the same part. There is little variation, and fine concave portions having a uniform pattern can be formed.

Although the present invention has been described with reference to some embodiments, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the gist of the present invention.
For example, in the above embodiment, the case where the fine concave portion is processed in the cylindrical outer peripheral surface has been described, but the present invention can be applied even when the fine concave portion is processed in the cylindrical inner peripheral surface, Similar effects can be obtained.
In addition, by applying the fine recess processing method shown in the above embodiment to a sliding portion of a sliding member such as a crank, a cam or a balancer for an automobile, the processed fine shape functions as a lubricating oil reservoir. Or the flow of the lubricating oil can be controlled, and the friction can be reduced.

It is explanatory drawing which shows the structure of 1st Example of the fine recessed part processing apparatus of this invention. It is a flowchart which shows one Example of the fine recessed part processing method using the fine recessed part processing apparatus of this example. It is a graph which shows the relationship between the value of sliding (friction coefficient) when a processing depth is made constant, and a pressing load. It is a graph which shows recording of the value of a slip. It is explanatory drawing which shows the structure of 2nd Example of the fine recessed part processing apparatus of this invention. It is explanatory drawing which shows the structure of 3rd Example of the fine recessed part processing apparatus of this invention. It is explanatory drawing which shows the structure of 4th Example of the fine recessed part processing apparatus of this invention. It is explanatory drawing (a) which shows the structure of 5th Example of the micro recessed part processing apparatus of this invention, and explanatory drawing (b) which shows the mode of the micro shape actually processed. It is a flowchart which shows the other Example of the fine recessed part processing method using the fine recessed part processing apparatus of this example. It is a flowchart which shows the further another Example of the fine recessed part processing method using the fine recessed part processing apparatus of this example.

Explanation of symbols

10, 12 Foam roller 20 Roller support member 22 Arm 30 Tool holder 32 Body 40 Load applying means 42 Elastic body 50 Load detector 60 Support member 70 Slip detection means 71 Slip detector 72 Rotational speed detector 73 Strain gauge 75 Machining shape measurement apparatus

Claims (18)

A fine recess processing apparatus for forming a fine recess on a circumferential surface of a workpiece,
A foam roller having a convex part for forming a concave part;
A roller support member for rotatably supporting the foam roller;
A tool holder for holding the roller support member in a state where the central axis of the circumferential surface and the rotation axis of the foam roller are parallel to each other;
A load applying means for applying a load to the roller support member to press the foam roller against the circumferential surface;
Slip detection means for detecting slip between the foam roller and the workpiece;
A load control means for changing the pressure contact load of the foam roller with respect to the circumferential surface by data inputted from the slip detection means;
A fine recess processing apparatus comprising:   The work piece and the tool holder further have a rotation mechanism capable of rotating relatively around the central axis of the circumferential surface, and the slip detection means measures a tangential force of the foam roller. The fine recess processing apparatus according to claim 1.   The fine recess processing apparatus according to claim 1 or 2, wherein the slip detection means measures a rotational speed difference between the foam roller and the workpiece.   The fine recess processing apparatus according to any one of claims 1 to 3, wherein the slip detection means measures strain of the roller support member.   The fine recess processing apparatus according to any one of claims 1 to 4, wherein the slip detection means measures a torque fluctuation of the workpiece.   6. The fine recess processing apparatus according to claim 1, wherein the slip detection means measures a distance between two or more fine shapes after processing.   The load control means calculates an average value of the slip between the foam roller and each workpiece inputted from the slip detection means, and changes the pressure load of the foam roller against the circumferential surface of the next workpiece. The fine recessed part processing apparatus according to any one of claims 1 to 6, wherein the apparatus is a fine recessed part processing apparatus.   The load control means calculates the average value of the slip for one rotation between the foam roller and the workpiece input from the slip detection means, and the next one rotation of the foam roller with respect to the circumferential surface of the workpiece. The apparatus for processing a fine recess according to any one of claims 1 to 7, wherein the pressure load is changed.   The load control means changes the pressure contact load of the foam roller against the circumferential surface of the workpiece so that the slip between the foam roller and the workpiece inputted from the slip detection means is constant. The fine recessed part processing apparatus of any one of Claims 1-8.   It further comprises a wear judging means for judging the wear of the foam roller from the change in the slip between the foam roller and the workpiece inputted from the slip detecting means or the change in the pressure load of the foam roller against the circumferential surface of the workpiece. The fine recess processing apparatus according to any one of claims 1 to 9, wherein:   The damage determination means for determining breakage of the foam roller from the change in the slip between the foam roller and the workpiece inputted from the slip detection means is further provided. The fine recessed part processing apparatus of description. A processing method for forming a fine recess on a circumferential surface of a workpiece using the fine recess processing apparatus according to any one of claims 1 to 11,
A load is applied to the roller support member by the load applying means so that the convex portion of the foam roller is pressed against the circumferential surface of the workpiece, and the foam roller is pressed against the circumferential surface of the workpiece along the circumferential surface. By forming the fine concave portion on the same circumferential surface by rolling, the fine concave portion is formed while changing the pressure contact load of the foam roller with respect to the circumferential surface by the load control means according to the data inputted from the slip detecting means. A method for processing fine recesses.   A sliding member, wherein fine concave portions are formed on a circumferential surface by the fine concave portion processing method according to claim 12.   A crankshaft comprising a journal and / or a pin having fine concave portions formed on a circumferential surface by the fine concave portion processing method according to claim 12.   A camshaft comprising a journal and / or a cam lobe in which fine concave portions are formed on a circumferential surface by the fine concave portion processing method according to claim 12.   A balancer shaft comprising a journal having fine concave portions formed on a circumferential surface by the fine concave portion processing method according to claim 12.   A piston pin, wherein fine concave portions are formed on a circumferential surface by the fine concave portion processing method according to claim 12.   A cylinder block comprising a cylinder bore having a fine recess formed on a circumferential surface by the fine recess processing method according to claim 12.

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