JP2006026778A - Sliding surface formation method and sliding surface shape in sliding member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding surface formation method and a sliding surface shape in a sliding member reducing sliding resistance of sliding surfaces sliding each other and capable of preventing seizure and galling. <P>SOLUTION: In the sliding surface formation method, the sliding surface 2 is formed on at least one sliding member 1 of the sliding members sliding each other. The sliding surface formation method is characterized in that it has a blade member pressing step for pressing a blade member 14 existing at a distal end of a working member 15 to one sliding member surface 2 moving in a direction approximately perpendicular to a sliding direction of one sliding member 1; an ultrasonic wave excitation step for applying ultrasonic vibration to the blade member 14; a blade member movement step for moving the blade member 14 pressed to one sliding member surface 2 along the sliding direction of one sliding member 1 at a predetermined speed; and a grinding step for uniformly grinding one sliding member surface 2 after the blade member movement step. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sliding surface forming method that can reduce sliding resistance of sliding surfaces that slide relative to each other and prevent seizure and galling, and a sliding surface shape in a sliding member.

  In a mechanical device, in particular, an internal combustion engine, a sliding motion that rotates or reciprocates between one sliding member and the other sliding member is performed.

  In order to improve fuel consumption and reduce emissions, the sliding frictional resistance associated with the sliding motion between the sliding members is reduced, and it is necessary to improve the lubrication characteristics.

  For this purpose, a plateau honing method disclosed in Patent Document 1, a cross-hatch honing method disclosed in Patent Document 2, a laser honing method disclosed in Patent Document 3, and the like have been proposed.

Japanese Patent Laid-Open No. 64-78755

Japanese Patent Laid-Open No. 7-40068

JP-A-6-198518

  According to the plateau honing method described in Patent Document 1, since the interval between the abrasive grains of the grindstone is irregular and wide, the lubricating oil is applied to the minute recesses on the sliding surface of the sliding member scraped by the abrasive grains. Even if an oil film is formed in the vicinity, the oil film breaks due to the wide gap between the adjacent recesses, and the sliding frictional resistance cannot be sufficiently reduced, and seizure on the sliding surface may occur. There was a problem that it was likely to occur.

  Further, according to the cross-hatching method described in Patent Document 2, a large number of fine elongated grooves having a width of 40 μm and a depth of 5 to 10 μm are arranged in parallel at intervals of 1.2 mm on the sliding surface of the sliding member. Since a large number of grooves similar to the above-mentioned grooves intersecting at an angle of 30 ° with respect to the many grooves in the group are formed in parallel, the lubricating oil is transmitted along these intersecting fine grooves. As a result, the possibility of causing seizure could not be avoided.

  Furthermore, according to the laser honing method described in Patent Document 3, a number of fine short grooves each having a length of 3 mm, a width of 60 μm, and a depth of 15 to 20 μm are formed in parallel at intervals of 2 mm. Lubricating oil stays in the groove and this groove serves as a lubricating oil reservoir, and the sliding frictional resistance is lowered. However, since the groove spacing is relatively wide, the groove occupation area ratio is small, high oil film retention cannot be obtained, and seizure resistance is low.

  The problem to be solved by the present invention is to provide a sliding member that overcomes such difficulties and a sliding surface forming method.

  The invention according to claim 1 is a sliding surface forming method for forming a sliding surface on at least one sliding member of sliding members that slide relative to each other, wherein the blade member present at the tip of the processing member is A blade member pressing step that presses against the surface of the one sliding member that moves in a direction substantially perpendicular to the sliding direction of the one sliding member; and an ultrasonic vibration step that applies ultrasonic vibration to the blade member; A blade member moving step of moving the blade member pressed against the surface of the one sliding member at a predetermined speed along the sliding direction of the one sliding member; and after the blade member moving step, And a grinding step for uniformly grinding the surface of the moving member.

  The invention according to claim 2 is characterized in that, in the sliding surface forming method, the grinding step is lapping.

  According to a third aspect of the present invention, in the sliding surface forming method, the vibration direction of the ultrasonic vibration is a direction in which the blade member vibrates substantially parallel to at least the moving direction of the one sliding member. It is a feature.

  The invention according to claim 4 is a sliding surface shape of at least one sliding member of the sliding members that slide relative to each other, and is formed in a direction substantially orthogonal to the sliding direction of the one sliding member. A plurality of substantially elliptical concave portions whose major axis is equal to or smaller than the width of the striations and deeper than the bottom surface of the striations are formed in parallel in the striations along the sliding direction.

  The invention according to claim 5 is characterized in that in the shape of the sliding surface, a substantially flat portion is formed between the streaks.

  The invention according to claim 6 is characterized in that, in the sliding surface shape, the substantially elliptical recesses are formed in a substantially flat surface by cutting.

  The invention according to claim 7 is characterized in that, in the sliding surface shape, the width, depth and length of the elliptical recess are in the order of microns.

  According to the first aspect of the present invention, the lubricating oil is stored in the shallow grooves formed in parallel at a predetermined interval on at least one sliding surface of the sliding members that slide relative to each other, and at the bottom of the groove. Since a large number of recesses oriented in the groove width direction are accumulated in the recesses formed in the longitudinal direction of the groove, sufficient lubrication oil can be present over a wide range on the sliding surface of the sliding member, and sliding friction resistance The seizure load increases and the seizure resistance is improved.

  Further, according to the invention described in claim 2, it is possible to reduce the sliding resistance of the sliding member and to improve the seizure resistance.

  Furthermore, according to the third aspect of the present invention, the depth of the grooves provided in parallel is reduced, and the lubricating oil is retained in the recesses formed with high density over the entire sliding surface. In addition, a high oil film retaining property can be obtained by a large recessed area occupied area ratio, and a significant reduction in sliding resistance and high seizure resistance can be achieved at the same time.

  According to invention of Claim 4, the sliding member of Claim 1 can be obtained efficiently and reliably.

  According to the invention described in claim 5, the sliding member described in claim 3 can be obtained easily and reliably.

  Furthermore, according to the invention described in claim 6, the sliding member described in claim 1 can be obtained efficiently.

  Furthermore, according to the seventh aspect of the invention, the sliding member of the first aspect can have a highly accurate sliding surface.

  Hereinafter, an embodiment of the present invention illustrated in FIGS. 1 to 4 will be described.

  The workpiece to which the present invention is applied is a rotary shaft 1 having a diameter of 70 to 100 cm, and the outer peripheral surface 2 of the rotary shaft 1 is roughly partitioned and cut into the outer peripheral surface 2 as shown in FIG. In addition, after being subjected to finish cutting, induction hardening is performed to a hardness of HRC ≦ 55.

  As shown in FIG. 1, the rotary shaft 1 is detachably held by a chuck 11 of a lathe 10 at one end, and is rotatably supported by a tailstock 12 at the other end. The chuck 11 is integrally attached to a spindle (not shown) that is rotatably supported by the motor, and the spindle is rotationally driven in the direction of an arrow by a motor (not shown).

  The cutting tip 14 is detachably and integrally attached to the tip of the cutting tool 15 on the peripheral surface of the rotary shaft 1, the cutting tool 15 is attached to the tip of the ultrasonic vibration device 16, and the tool post 17 is supported on the carriage 18. The carriage 18 is driven to move in the axial direction of the rotary shaft 1 by 100 μm every time the spindle, that is, the rotary shaft 1 makes one rotation.

  When the lathe 10 and the ultrasonic vibration device 16 are in operation, the outer peripheral surface 2 of the rotary shaft 1 is rotationally driven in the arrow direction A as shown in FIG. An ultrasonic vibration of 20 to 50 kilohertz is transmitted, and the chip 14 reciprocates in the vertical direction B.

  Since the tip 14 moves 100 μm in the axial direction every time the rotating shaft 1 makes one revolution, as shown in FIG. 3, the streak 3 oriented in the circumferential direction is formed on the outer peripheral surface 2 of the rotating shaft 1. At the same time, a lace-like vibration machining trace 5 oriented in the width direction of the stripe 3 is formed in the groove 4 of the stripe 3, and the protruding portion 6 of the vibration machining trace 5 has a height of 4 to 5 μm and a width of 0. .1mm.

  When the lapping process is performed on the outer peripheral surface 2 of the rotating shaft 1 after the above-described ultrasonic vibration process, the protrusion 6 around the vibration mark 5 is deleted as shown in FIG. A processing mark 7 in units of microns is formed in both the width, depth, and depth.

  On the outer peripheral surface 2 of the rotating shaft 1 after the lapping processing is completed, the finishing processing marks 7 having the size as described above are formed in a substantially uniformly dispersed manner over the entire outer peripheral surface 2. The sliding resistance is drastically lowered due to being retained in the finishing mark 7.

  Moreover, since it can finish in arbitrary process trace area ratios by the processing depth of a lapping process, an oil film holding | maintenance performance is high and seizure resistance improves.

  Furthermore, in this embodiment, since the intermediate finishing process is not required and the ultrasonic vibration machining process can be completed in a short time, the productivity is high and the cost can be reduced.

  Even in the rotary shaft 1 that has completed only the ultrasonic vibration machining process described above, a lace-like vibration machining trace 5 is formed on the outer peripheral surface 2 of the rotary shaft 1, and lubricating oil is reserved in the vibration machining trace 5. Sliding resistance is low.

  Next, the case where the workpiece shown in FIG. 5 of the application object of the present invention is the cylinder sleeve 20 will be described.

  The cylinder hole inner peripheral surface 21 of the cylinder sleeve 20 is subjected to induction hardening to a hardness of HRC ≦ 55 after rough finishing and finishing.

  As shown in FIG. 5, the cylinder sleeve 20 is fixed on a table (not shown), and the central axis of the ultrasonic vibration device 30 is positioned on the extension line of the central axis of the cylinder hole inner peripheral surface 21. An ultrasonic vibration device 30 is disposed, and the ultrasonic vibration device 30 is driven to move in the axial direction.

  The ultrasonic vibration device 30 includes an ultrasonic vibrator 31, a cone 33, and a horn 33. The ultrasonic vibration generated by the ultrasonic vibrator 31 is amplified by the cone 32 and the horn 33, and It is transmitted to the conical body 34.

  As shown in the lower part of FIG. 5, the holding body 35 at the tip of the horn 33 is formed with a parallel groove 36 oriented in the diameter direction, and holders 37 are slidably fitted to both ends of the groove 36. A grindstone 39 is integrally coupled to the tip of the holder 37. A long hole 38 oriented in the longitudinal direction is formed in the holder 37, a bolt 40 is screwed into the holding body 35 through the long hole 38, and the inner peripheral surface of the holder 37 is attached to the outer peripheral surface of the conical surface body 34. When the cone face 34 is vibrated in the axial direction by the ultrasonic transducer 31, the holder 37 and the grindstone 39 are reciprocated in the diameter direction of the holding body 35.

  In the embodiment shown in FIG. 5, when the ultrasonic vibration device 30 is in the operating state, when the conical surface body 34 is vibrated in the axial direction, the grindstone 39 is caused to move into the cylinder hole of the cylinder sleeve 20 by the conical surface of the conical surface body 34. Since the inner circumferential surface 21 rotates in the circumferential direction while abutting, the honing process is performed on the inner circumferential surface 21 of the cylinder hole.

  Also, on the inner peripheral surface 21 of the cylinder hole, the streak 22 and the vibration processing mark 23 similar to the embodiment shown in FIGS. 1 to 4 are formed.

  When the lapping process similar to that described above is performed after the honing process is finished, a finishing mark as shown in FIG. 4 is formed.

Therefore, the present embodiment can achieve the same effects as those of the first embodiment described above.

It is the schematic perspective view which illustrated the implementation condition of 1st Embodiment of this invention. It is a principal part enlarged front view of FIG. It is a principal part enlarged plan view of the vibration processing trace formed in the rotating shaft outer peripheral surface with the apparatus shown in FIG. FIG. 4 is an enlarged plan view of a main part of a finish processing mark obtained by lapping the outer peripheral surface of a rotating shaft illustrated in FIG. It is a vertical side view of other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 2 ... Outer peripheral surface, 3 ... Strip, 4 ... Groove, 5 ... Vibration processing trace, 6 ... Protrusion part, 7 ... Finish processing trace, 10 ... Lathe, 11 ... Chuck, 12 ... Tailstock, 13 ... Spindle base, 14 ... Chip, 15 ... Bite, 16 ... Ultrasonic vibrator, 17 ··· Tool post, 18 ··· Reciprocating base, 20 ··· Cylinder sleeve, 21 ··· Cylinder hole inner peripheral surface, 22 ··· Strip, 23 ··· Vibrated machining trace, 30 ··· Sonic excitation device, 31 ... ultrasonic transducer, 32 ... cone, 33 ... horn, 34 ... conical body, 35 ... holding body, 36 ... groove, 37 ... Holder, 38 ... long hole, 39 ... grinding wheel, 40 ... bolt.

Claims (7)

A sliding surface forming method for forming a sliding surface on at least one sliding member of sliding members that slide relative to each other,
A blade member pressing step of pressing the blade member present at the tip of the processing member against the surface of the one sliding member that moves in a direction substantially perpendicular to the sliding direction of the one sliding member;
An ultrasonic vibration process for applying ultrasonic vibration to the blade member;
A blade member moving step of moving the blade member pressed against the surface of the one sliding member at a predetermined speed along the sliding direction of the one sliding member;
And a grinding step for uniformly grinding the surface of the one sliding member after the blade member moving step. 2. The sliding surface forming method according to claim 1, wherein the grinding step is lapping. 2. The sliding surface forming method according to claim 1, wherein a vibration direction of the ultrasonic vibration is a direction in which the blade member vibrates substantially parallel to a moving direction of at least one of the sliding members. Item 3. A sliding surface forming method according to Item 2. The sliding surface shape of at least one of the sliding members that slide relative to each other,
Inside the streak formed in a direction substantially orthogonal to the sliding direction of the one sliding member, a substantially elliptical concave portion whose major axis is equal to or smaller than the streak width and deeper than the bottom of the streak is in the sliding direction. A sliding surface shape of the sliding member, wherein a plurality of the sliding members are formed in parallel. The sliding surface shape of the sliding member according to claim 4, wherein a substantially flat portion is formed between the streaks in the sliding surface shape. The sliding surface shape of the sliding member according to claim 4 or 5, wherein, in the sliding surface shape, a space between the substantially elliptical concave portions is formed by cutting. The sliding surface shape in the sliding member according to any one of claims 4 to 6, wherein in the sliding surface shape, the width, depth, and length of the elliptical concave portion are in the order of microns.

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