JP2006255813A - Device and method for machining fine recessed part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for machining fine recessed parts by which fine recessed parts can be formed on the inner peripheral face or the outer peripheral face of a workpiece with excellent accuracy, machining costs can be reduced, in addition, plastic flow and springback at a part where the fine recessed parts are formed can be reduced, and also, the service lifetime of a machining roller can be prolonged. <P>SOLUTION: The device for machining fine recessed parts is provided with the machining roller 11 provided with fine unevenness on the outer peripheral face and rotating around a roller shaft 12, a pressing mechanism 20, which allows the outer peripheral face of the machining roller 11 to be pressed against the inner peripheral face Ba by bringing the machining roller 11 close to or by separating it from the inner peripheral face Ba of a cylinder bore B supported by the central axis in parallel with the roller shaft 12, and a laser irradiator 15 for locally softening the inner peripheral face Ba of the cylinder bore B. The machining roller 11 executes machining by revolving around the central axis while pressing the fine unevenness on its outer peripheral face against the inner peripheral face Ba of the cylinder bore B in the cylinder bore B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention, for example, has a fine structure for realizing low friction on the inner peripheral surface of a cylinder bore (circular hole) in a cylinder block of an automobile engine and the outer peripheral surface of a member such as a crank journal, a crankpin, and a cam journal. The present invention relates to a fine concave portion processing apparatus and a fine concave portion processing method used to form a concave portion (oil sump).

  Conventionally, shot blasting is often used when forming a fine recess in the inner peripheral surface of the cylinder bore of the cylinder block as described above. In this shot blasting, a masking sheet having a predetermined shape of holes is affixed to the inner peripheral surface of the cylinder bore, and then small diameter particles such as ceramics are projected onto the inner peripheral surface of the cylinder bore together with compressed air, thereby A recess is formed in a portion exposed through the through hole of the surface.

Then, after the recess is formed, the masking sheet is removed and washed, and then honing is performed again to remove the swelled portion generated around the recess in the shot blasting process.
JP 2002-307310 A

  However, in the formation of fine recesses using shot blasting as described above, it is difficult to regularly arrange the fine recesses, and in addition, the masking sheet is attached to the inner peripheral surface of the circular hole. The process, the removal process, and the cleaning process are indispensable, and there is a problem that the processing cost is increased by the amount of such work, and it has been a conventional problem to solve these problems .

  The present invention has been made paying attention to the above-described conventional problems, and it is possible to form fine recesses with good accuracy on the inner peripheral surface or the outer peripheral surface of the workpiece, as well as the processing cost. In addition, it is possible to reduce plastic flow and springback at the part where the minute recesses are formed, and also to reduce the stress on the processing roller and extend the life of the processing roller. It is an object of the present invention to provide a fine recess processing apparatus and a fine recess processing method that can be performed.

  The present invention is a fine recess processing apparatus for forming fine recesses on the inner peripheral surface or outer peripheral surface of a workpiece, the processing roller having fine unevenness on the outer peripheral surface and rotating around a roller shaft, and the processing roller A pressing mechanism that allows the outer peripheral surface of the processing roller to be pressed against the inner peripheral surface or the outer peripheral surface of the work by being moved closer to and away from a work supported by a central axis that is parallel to the roller shaft, and the fine concave portion is to be formed. The present invention is characterized in that it includes a softening means for locally softening a work site of a workpiece, and the structure of the fine recess processing apparatus is used as a means for solving the above-described conventional problems.

  The present invention is also a fine recess processing apparatus for forming a fine recess on the inner peripheral surface of a work, wherein the processing roller is inserted into the circular hole of the work, and the fine unevenness of the outer peripheral surface is formed in the circular hole. It is characterized in that it is configured to perform processing by turning around the center axis of the workpiece while pressing against the inner peripheral surface, and the present invention is a fine recess processing apparatus that forms a fine recess on the outer peripheral surface of the workpiece, The processing roller approaches the outer peripheral surface of the workpiece rotating around the central axis, and performs processing by pressing fine irregularities on the outer peripheral surface against the outer peripheral surface of the workpiece.

  On the other hand, the fine recess processing method of the present invention is the above-described work to be processed of the work to be formed with the softening means when the fine recess is formed on the inner peripheral surface or the outer peripheral surface of the work using the fine recess processing apparatus. Machining with a pressing mechanism while locally softening the part (or after predicting the part to be processed of the workpiece on which fine recesses are to be formed and softening the workpiece to be processed locally by the softening means) It is characterized in that the outer peripheral surface of the roller is pressed against the part to be processed of the workpiece to form a fine concave portion, and the configuration of this fine concave portion processing method is a means for solving the above-described conventional problems.

  In the fine recessed part processing apparatus and the fine recessed part processing method of the present invention, the pressing roller presses the outer peripheral surface of the processing roller against the work site of the work (or before pressing), and the soft part is made fine using a softening means such as a laser or an ultrasonic wave. If only the part to be processed of the workpiece where the recess is to be formed is locally softened, the transferability of fine irregularities on the outer peripheral surface of the processing roller will be improved, and the inner peripheral surface or outer peripheral surface of the workpiece will be improved. Therefore, it is possible to form fine concave portions with good accuracy.

  Moreover, since the site | part which forms a fine recessed part softens, a plastic flow and a spring back are reduced, and also the stress with respect to a processing roller is relieve | moderated, Therefore The lifetime of a processing roller is achieved.

  When the outer peripheral surface of the processing roller is pressed against the workpiece portion of the workpiece by the pressing mechanism and only the workpiece portion of the workpiece where the fine recess portion is to be formed is locally softened using the softening means, The processing position to be formed and the position to be softened can be matched with high accuracy. On the other hand, before pressing the outer peripheral surface of the processing roller against the part to be processed by the pressing mechanism, a fine recess is formed by using a softening means. When only the part to be processed of the workpiece to be softened is locally softened, the range of the part to be softened can be controlled with high accuracy.

  According to the present invention, since it is possible to process by locally softening the hardness of the work site of the workpiece to be formed with a fine recess, after realizing a long life of the processing roller and a reduction in processing cost, It is possible to form fine recesses with good accuracy with respect to the inner or outer peripheral surface of the workpiece, and in addition, it is extremely excellent that plastic flow and springback at the site where the fine recesses are formed can be reduced. Effect.

  In the fine recess processing apparatus of the present invention, the softening means has directivity and can be configured to be capable of directing over 360 °. In this case, the work site of the workpiece on which the fine recess is to be formed Can be appropriately softened.

  Moreover, in the fine recessed part processing apparatus of the present invention, it is possible to employ a configuration including position measuring means such as a CCD or a camera for measuring the position where the fine recessed part of the workpiece is formed and the position softened by the softening means. If this configuration is adopted, when a deviation occurs between the position where the fine recess is formed and the position softened by the softening means, it can be corrected quickly.

  Furthermore, in the fine recess processing apparatus of the present invention, it can be configured to have a cooling means for rapidly cooling a work unnecessary portion that does not require a fine recess of the work. In this case, the inner peripheral surface or the outer periphery of the work After the entire surface is once softened by the softening means, the work-unnecessary part of the workpiece can be rapidly cooled to increase the hardness, which is suitable for the process of forming fine recesses in a wide range.

  Furthermore, in the fine recess processing apparatus of the present invention, a configuration in which the softening means is a laser irradiator can be adopted, and by adopting this configuration, the processing site can be locally softened without contacting the workpiece. That is, the part to be processed can be locally softened without damaging the workpiece.

  On the other hand, in the fine recess processing method of the present invention, when the work site of the workpiece is locally softened by the softening means, the degree of softening can be changed for each location, and when this configuration is adopted, As shown in FIG. 5, the degree of softening is changed in order from the left, and the softening processing part SL having a low softening degree (high hardness), the softening processing part SM having a medium softening degree (medium hardness), and a large softening degree (low) When the load F is applied to the processing roller 11, the depths d1, d2, and d3 of the adjacent fine recesses can be changed digitally, that is, the fine recesses. The depth can be controlled with high accuracy.

  Further, in the fine recess processing method of the present invention, when the work portion of the workpiece is locally softened by the softening means, the groove bottom surface portion Tb at the center of the fine recess T to be formed is locally formed as shown in FIG. It is possible to employ a configuration in which the groove wall portions Tw on both sides of the fine recess T to be formed can be locally softened, as shown in FIG. When the portion Tb is locally softened, the groove bottom surface portion Tb can be processed with high accuracy. On the other hand, when the groove wall portions Tw on both sides of the fine recess T are locally softened, The groove wall portion Tw can be processed with high accuracy.

  A piston slides on a workpiece having a fine recess formed on the inner peripheral surface of a circular hole, for example, an engine cylinder block having a fine recess on the inner peripheral surface of a cylinder bore, processed using the above-described fine recess processing apparatus. The friction on the inner peripheral surface of the cylinder bore becomes low, and as a result, it can contribute to the improvement of fuel consumption.

  11 and 12 both show a cylinder block SB of an engine having a fine recess on the inner peripheral surface of the cylinder bore. As shown in an enlarged portion of FIG. 11, the upper surface of the piston on the inner peripheral surface Ba of the cylinder bore B is shown. The depth d of the fine recess T formed in the vicinity of the dead center Bu and the bottom dead center Bl is made deeper than the depth d of the fine recess formed in the process center portion Bm between both dead points Bu, Bl, As shown in the enlarged portion of FIG. 12, the depth d of the fine recess T formed in the piston skirt contact portion Bs on the inner peripheral surface Ba of the cylinder bore B is formed in a portion other than the skirt contact portion Bs. In any case, the friction of the inner peripheral surface Ba of the cylinder bore B that is the sliding surface is low, and as a result, the fuel consumption is improved. Can contribute To become.

  FIG. 13 also shows an engine cylinder block SB having a fine recess on the inner peripheral surface of the cylinder bore. As shown in an enlarged portion of FIG. 13, the fine recess T formed on the inner peripheral surface Ba of the cylinder bore B is shown. The depth d can be a cylinder block SB having a configuration set in proportion to the distance X from the bolt hole D used to fix the cylinder head to the inner peripheral surface Ba of the cylinder bore B. However, the friction of the inner peripheral surface Ba of the cylinder bore B which is a sliding surface is low, and as a result, it can contribute to the improvement of fuel consumption.

  On the other hand, workpieces having fine recesses processed on the outer peripheral surface using the fine recess processing apparatus described above, for example, engine members such as a crank journal, a crankpin, a cam journal, and a cam lobe, are provided on the outer peripheral surface which is a sliding surface. The friction is low, and as a result, it can contribute to the improvement of fuel consumption.

  EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to a following example.

  As shown in FIG. 2, this fine recess processing apparatus 1 is an NC machine tool that forms fine recesses on the inner peripheral surface of a cylinder bore that is a circular hole of a cylinder block of an automobile engine, and is movable in the vertical direction. A spindle 3 supported in a state of protruding downward from the spindle head 2, a workpiece mounting table 4 that is movable below the spindle head 2 in two orthogonal directions within a horizontal plane, and coaxial with the spindle 3 And a holder 10 that rotates integrally with the holder 10. The holder 10 is attached to and detached from the main shaft 3 by an automatic tool changer (not shown).

  As shown in FIG. 1, the holder 10 includes a processing roller 11 having fine irregularities on the outer peripheral portion, a roller support portion 13 that rotatably supports the processing roller 11 via a roller shaft 12, and the roller The processing roller 11 is moved closer to and away from the housing 14 that holds the support portion 13 so as to be movable in a direction orthogonal to the main shaft 3, and the inner peripheral surface Ba of the cylinder bore B whose center axis is aligned with the rotation axis L of the holder 10. A pressing mechanism 20 capable of pressing fine irregularities on the outer peripheral surface, and a laser irradiator 15 as a softening means for locally softening a portion to be processed on the inner peripheral surface Ba of the cylinder bore B where a fine concave portion should be formed are provided. The laser irradiator 15 is attached to the lower end of the housing 14 through a universal joint 16 so as to be capable of directing over 360 °.

  The pressing mechanism 20 includes a compression coil spring 21 positioned between the roller support portion 13 and the housing 14 and a stepping motor (not shown) built in the upper end of the housing 14. As a result, the entire housing 14 is brought close to the inner peripheral surface Ba of the cylinder bore B, and the compression coil spring 21 applies a load in a direction orthogonal to the main shaft 3 to the cylinder bore B. The fine irregularities of the processing roller 11 are pressed against the inner peripheral surface Ba. A piezoelectric load cell (not shown) is provided between the housing 14 and the compression coil spring 21.

  In this case, a camera 17 is attached to the upper end of the housing 14 as a position measuring means for measuring the position where the fine recess is formed and the position softened by the laser irradiator 15 via the universal joint 18.

  In the fine recess processing apparatus 1 described above, when forming the fine recess on the inner peripheral surface Ba of the cylinder bore B, first, the main shaft 1 and the center axis of the cylinder bore B are positioned so as to substantially coincide with each other. The holder 10 is lowered and the processing roller 11 is inserted into the cylinder bore B.

  Next, as shown by a solid line in FIG. 2, the pressing mechanism 20 is operated to bring the processing roller 11 into contact with the inner peripheral surface Ba of the cylinder bore B until the load detected by the load cell reaches a preset value. The operation of the pressing mechanism 20 is continued.

  That is, after the processing roller 11 comes into contact with the inner peripheral surface Ba of the cylinder bore B, when the operation of the pressing mechanism 20 is continued, the compression coil spring 21 is compressed between the roller support portion 13 and the housing 14, and the repulsive force thereof. Is applied to the processing roller 11 as a load, and this load is detected by a load cell (not shown). Therefore, if the operation of the pressing mechanism 20 is continued until the detected load of the load cell reaches a set value, the cylinder bore B The inner peripheral surface Ba can be pressurized with a predetermined load.

  Then, as described above, at the stage where the set value of the load is detected, after the operation of the pressing mechanism 20 is stopped, the laser is irradiated from the laser irradiator 15 set toward the working point of the processing roller 11. Then, when the holder 10 is rotated together with the main shaft 1 while locally softening the part to be processed of the inner peripheral surface Ba of the cylinder bore B where the fine recesses are to be formed, the processing pressed against the inner peripheral surface Ba of the cylinder bore B The roller 11 turns around the rotation axis L, and as shown by the solid line in FIG. A concave portion is formed.

  Then, when the fine recess processing is completed, the pressing mechanism 20 is operated to separate the processing roller 11 from the inner peripheral surface Ba of the cylinder bore B, and then the holder 10 is lifted together with the spindle 1 that has stopped rotating, The processing roller 11 is detached from the cylinder bore B.

  During the above processing, the camera 17 takes images of both the positions where the fine recesses are formed and the positions softened by the laser irradiation. When these positions are displaced, the laser irradiator 15 is aimed. Change the position to soften by changing.

  As described above, in the fine concave portion processing method using the fine concave portion processing apparatus 1 according to this embodiment, the region to be processed on the inner peripheral surface Ba of the cylinder bore B where the fine concave portion is to be formed is irradiated with a laser to be locally softened. Since the processing by the processing roller 11 is performed, the transferability of fine irregularities on the outer peripheral surface of the processing roller 11 is improved, and the fine concave portion is accurately formed on the inner peripheral surface Ba of the cylinder bore B. Can be formed.

  Moreover, since the site | part which forms a fine recessed part softens, a plastic flow and a spring back are reduced, and also the stress with respect to the processing roller 11 is relieve | moderated, Therefore The lifetime of the processing roller 11 will be achieved.

  Furthermore, in the fine recess processing method using the fine recess processing apparatus 1 according to this embodiment, the laser irradiator 15 having directivity is used as the softening means, and the laser irradiator 15 is connected to the lower end portion of the housing 14 via the universal joint 16. Therefore, the portion to be processed in which the fine concave portion of the inner peripheral surface Ba of the cylinder bore B is to be formed can be softened accurately and without causing damage.

  Furthermore, in the fine concave portion processing method using the fine concave portion processing apparatus 1 according to this embodiment, both the position where the fine concave portion is formed and the position softened by laser irradiation are photographed by the camera 17 during the processing. Therefore, when a deviation occurs between the position where the fine concave portion is formed and the softened position, it can be quickly dealt with.

  In this embodiment, the laser is irradiated from the laser irradiator 15 toward the working point of the processing roller 11. However, a portion to be processed in which a fine recess is to be formed is predicted and shown in the development view of FIG. As described above, after the part to be processed is locally softened by the laser irradiator 15, the outer peripheral surface of the processing roller 11 is pressed against the softened part S to be processed by the pressing mechanism 20 to form the fine recess T. May be.

   Here, in the fine recess processing method using the fine recess processing apparatus 1 described above, when the processed portion of the inner peripheral surface Ba of the cylinder bore B is locally softened by the laser irradiator 15, the degree of softening is changed for each location. In this case, as shown in FIG. 5, the degree of softening is changed in order from the left to soften the processing site SL having a small softness (high hardness), and a medium softening degree (medium (Hardness) softening processed part SM and softening processed part SH with a high degree of softening (low hardness), when the load F is applied to the processing roller 11, the depths d1, d2, and the adjacent fine recesses It is possible to perform highly accurate control such as changing d3 digitally.

  Further, in the fine concave portion processing method using the fine concave portion processing apparatus 1 described above, when the portion to be processed on the inner peripheral surface Ba of the cylinder bore B is locally softened by the laser irradiator 15, as shown in FIG. The groove bottom portion Tb at the center of the fine recess T to be formed is used as the softened processing portion Sb, and the groove wall portions Tw on both sides of the fine recess T to be formed are used as the softening processed portion Sw as shown in FIG. When the groove bottom surface portion Tb at the center of the fine recess T is locally softened, the rise of the groove bottom surface portion Tb can be suppressed, while the groove wall portions Tw on both sides of the fine recess T are reduced. Is locally softened, the angle of the groove wall portion Tw with respect to the inner peripheral surface Ba of the cylinder bore B can approach 90 °.

  The cylinder block of the engine having the fine concave portion processed by using the fine concave portion processing apparatus 1 on the inner peripheral surface Ba of the cylinder bore B has low friction on the inner peripheral surface Ba of the cylinder bore B on which the piston slides. As a result, it can contribute to an improvement in fuel consumption.

  FIG. 8 shows another embodiment of the fine recess processing apparatus of the present invention. As shown in FIG. 8, the micro recess processing apparatus 31 in this embodiment is the same as the micro recess processing apparatus 1 in the previous embodiment. The difference is that the laser irradiator 15 is fixed to the housing 14, and a gas injector 32 as a cooling means for rapidly cooling a processing unnecessary portion that does not require the fine concave portion of the inner peripheral surface Ba of the cylinder bore B is provided at the lower end of the housing 14. The other structure is the same as that of the fine recess processing apparatus 1 in the previous embodiment (the camera 17 is omitted in FIG. 8).

  In the fine recess processing apparatus 31, when forming the fine recess on the inner peripheral surface Ba of the cylinder bore B, first, the main shaft 1 and the center axis of the cylinder bore B are positioned so as to substantially coincide with each other. 10 is lowered and the processing roller 11 is inserted into the cylinder bore B. Then, the holder 10 is rotated together with the main shaft 1 while irradiating the laser from the laser irradiator 15, and the entire inner peripheral surface Ba of the cylinder bore B is rotated. Once softened.

  Next, the pressing mechanism 20 is operated to bring the processing roller 11 into contact with the inner peripheral surface Ba of the cylinder bore B, and the operation of the pressing mechanism 20 is continued until the load detected by the load cell reaches a preset value. When the set value is detected, when the holder 10 is rotated together with the main shaft 1 after the operation of the pressing mechanism 20 is stopped, the processing roller 11 pressed against the inner peripheral surface Ba of the cylinder bore B is rotated. When the rotation of the main shaft 1 and the descending speed are synchronized in this state, a fine recess is formed in a wide region of the inner peripheral surface Ba of the cylinder bore B.

  Next, by operating the gas injector 32, as shown in the developed view of FIG. 9, the portion other than the softened workpiece S where the fine concave portion T of the inner peripheral surface Ba of the cylinder bore B is formed, that is, the fine The processing-unnecessary portion C that does not require a recess is rapidly cooled to increase the hardness.

  As described above, in the fine concave portion processing method using the fine concave portion processing apparatus 31 according to this embodiment, the entire surface of the inner peripheral surface Ba of the cylinder bore B is softened by irradiating the laser, and then the processing by the processing roller 11 is performed. As a result, the transferability of fine irregularities on the outer peripheral surface of the processing roller 11 is improved, and fine concave portions can be formed with high accuracy on the inner peripheral surface Ba of the cylinder bore B.

  Further, the gas ejected from the gas injector 32 can rapidly cool a portion that does not require a fine recess to increase the hardness, so that it is suitable for processing that forms the fine recess in a wide range.

  In each of the above-described embodiments, the case where the fine concave portion is formed on the inner peripheral surface Ba of the cylinder bore B which is a circular hole of the cylinder block of the automobile engine is shown. However, the present invention is not limited to this. As shown, a roller supporting portion 53 is provided on the outer peripheral surface Wa of a workpiece W that rotates around a central axis, for example, a crank journal, a crankpin, a cam journal, a cam lobe, or the like, using a fine recess processing device 41. The processing roller 51 supported on the outer periphery of the processing roller 51 is brought close to the outer peripheral surface Wa of the engine member W by pressing the fine unevenness of the outer peripheral surface of the processing roller 51 to perform processing, thereby forming a fine recess. Well, in the engine member W having fine concave portions processed on the outer peripheral surface W using the fine concave portion processing apparatus 41, the outer peripheral surface Wa which is a sliding surface Friction becomes as low, as a result, and thus may contribute to improved fuel economy.

  Further, the detailed configuration of the fine recess processing apparatus of the present invention is not limited to the above-described embodiment, and as another configuration, for example, the processing roller 11 is provided with a plurality of rows of fine irregularities. Alternatively, the compression coil spring 21 may be replaceable in order to change the load applied to the processing roller 11.

  Further, in the above-described embodiment, the case where the pressing mechanism 20 includes the compression coil spring 21 is taken as an example. However, other means can be applied as long as the means applies a constant load. It is also possible to use a pneumatic or hydraulic actuator as the mechanism 20.

  Furthermore, in the above-described embodiment, the laser irradiator 15 is used as the softening means. However, the present invention is not limited to this. For example, ultrasonic waves can be used as the softening means.

  Furthermore, in the above-described embodiment, the camera 17 is used as the position measuring unit. However, the present invention is not limited to this. For example, a CCD may be used as the position measuring unit.

  Furthermore, in the above-described embodiment, the gas injector 32 is used as the cooling means. However, the present invention is not limited to this, and for example, a fine liquid injector can be used as the cooling means. .

It is sectional explanatory drawing of the tool holder which shows one Example of the fine recessed part processing apparatus of this invention. Example 1 It is a whole perspective explanatory drawing of the fine recessed part processing apparatus which comprised the tool holder shown in FIG. FIG. 2 is an explanatory cross-sectional view showing a state in which the tool holder shown in FIG. 1 is moved in the axial direction in a cylinder bore. It is an expanded view of the internal peripheral surface which shows the positional relationship of the softening site | part and fine recessed part in the internal peripheral surface of a cylinder bore. FIG. 4 is an enlarged cross-sectional explanatory view of the inner peripheral surface of a cylinder bore showing the relationship between the degree of softening and the depth of the fine recess in the fine recess processing method of the present invention. It is an expanded sectional explanatory view of the internal peripheral surface of a cylinder bore which shows the state where the groove bottom part of the center of the fine crevice which should be formed in the fine crevice processing method of the present invention was softened locally. It is an expanded sectional explanatory view of the internal peripheral surface of a cylinder bore which shows the state where the groove wall part of the both sides of the fine crevice which should be formed in the fine crevice processing method of the present invention was softened locally. It is sectional explanatory drawing of the tool holder which shows the other Example of the fine recessed part processing apparatus of this invention. (Example 2). It is an expanded view of the internal peripheral surface which shows the positional relationship of the softening site | part, fine recessed part, and a process unnecessary site | part in the internal peripheral surface of a cylinder bore. It is principal part expansion explanatory drawing which shows other Example of the fine recessed part processing apparatus of this invention. Example 3 It is a section explanatory view of a cylinder block which has a fine crevice formed by a fine crevice processing device and a fine crevice processing method of the present invention in an inner peripheral surface of a cylinder bore. It is plane explanatory drawing of the other cylinder block which has the fine recessed part formed with the fine recessed part processing apparatus and the fine recessed part processing method of this invention in the internal peripheral surface of a cylinder bore. It is plane explanatory drawing of the further another cylinder block which has the fine recessed part formed with the fine recessed part processing apparatus and the fine recessed part processing method of this invention in the internal peripheral surface of a cylinder bore.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,31,41 Fine recessed part processing apparatus 11,51 Processing roller 12 Roller shaft 15 Laser irradiator (softening means)
17 Camera (position measuring means)
20 pressing mechanism 21 compression coil spring (pressing mechanism)
32 Gas injector (cooling means)
B Cylinder bore Ba Inner circumferential surface of the cylinder B1 Piston bottom dead center Bm Process center part Bs Piston skirt contact part Bu Piston top dead center C Processing unnecessary part D Bolt hole SB Cylinder block T Fine recess Tb Fine recess groove Bottom part Tw Groove wall part of fine recess W Member for engine (workpiece)
Wa Outer surface of engine member X Distance from bolt hole to inner surface of cylinder bore d Depth of minute recess

Claims (22)

  A fine recess processing apparatus for forming fine recesses on the inner peripheral surface or outer peripheral surface of a workpiece, the processing roller having fine unevenness on the outer peripheral surface and rotating around a roller shaft, and the processing roller as the roller shaft A pressing mechanism that allows the outer peripheral surface of the processing roller to be pressed against the inner peripheral surface or the outer peripheral surface of the workpiece by approaching and separating from a workpiece supported by a parallel central axis, and the workpiece to be processed in which a fine recess is to be formed A fine recess processing apparatus comprising a softening means for locally softening a part.   2. The fine roller according to claim 1, wherein the processing roller is inserted into a circular hole of the workpiece, and performs processing by turning around the central axis of the workpiece while pressing fine irregularities of the outer peripheral surface against the inner peripheral surface of the circular hole. Concave processing device.   The fine recess processing apparatus according to claim 1, wherein the processing roller approaches the outer peripheral surface of the work rotating around the central axis and performs processing by pressing fine irregularities on the outer peripheral surface against the outer peripheral surface of the work.   The fine recess processing apparatus according to any one of claims 1 to 3, wherein the softening means has directivity and can be directed over 360 °.   5. The fine recess processing apparatus according to claim 4, further comprising position measuring means for measuring a position where the fine recess of the workpiece is formed and a position softened by the softening means.   The fine recess processing apparatus according to any one of claims 1 to 5, further comprising a cooling unit that rapidly cools a processing unnecessary portion that does not require a fine recess of the workpiece.   The fine recess processing apparatus according to any one of claims 1 to 6, wherein the softening means is a laser irradiator.   When forming a fine recess in a work using the fine recess processing apparatus according to any one of claims 1 to 7, while softening a work site of the work where the micro recess should be formed by a softening means, A fine recess processing method, comprising pressing a peripheral surface of a processing roller against a portion to be processed of the workpiece by a pressing mechanism to form a fine recess.   When forming a fine recess in a work using the fine recess processing apparatus according to any one of claims 1 to 7, a work site of the work on which the fine recess is to be formed is predicted, and the workpiece is covered by a softening means. A method of processing a fine recess, comprising: locally softening a processing portion, and then pressing the outer peripheral surface of the processing roller against the softened processing portion of the workpiece by a pressing mechanism to form a fine recess.   The method for machining a fine recess according to claim 8 or 9, wherein the degree of softening is changed for each place when the work site of the workpiece is locally softened by the softening means.   The microrecessed portion according to any one of claims 8 to 10, wherein when the work site of the workpiece is locally softened by the softening means, the groove bottom portion at the center of the fine recessed portion to be formed is locally softened. Processing method.   The microrecessed portion according to any one of claims 8 to 10, wherein when the work site of the workpiece is locally softened by the softening means, the groove wall portions on both sides of the fine recessed portion to be formed are locally softened. Processing method.   A work having fine concave portions processed by using the fine concave portion processing apparatus according to any one of claims 1, 2, 4 to 7 on an inner peripheral surface of a circular hole.   A cylinder block having fine concave portions processed by using the fine concave portion processing apparatus according to any one of claims 1, 2, 4 to 7 on an inner peripheral surface of a cylinder bore.   The depth of the fine concave portion formed in the vicinity of the top dead center and the bottom dead center of the piston on the inner peripheral surface of the cylinder bore is deeper than the depth of the fine concave portion formed in the center of the process between the two dead points. Item 15. The cylinder block according to Item 14.   The depth of the fine recess formed in the skirt contact portion of the piston on the inner peripheral surface of the cylinder bore is made deeper than the depth of the fine recess formed in a portion other than the skirt contact portion. Cylinder block as described.   The cylinder according to claim 14, wherein the depth of the fine recess formed in the inner peripheral surface of the cylinder bore is set in proportion to the distance from the bolt hole used to fix the cylinder head to the inner peripheral surface of the cylinder bore. block.   A work having fine concave portions processed by using the fine concave portion processing apparatus according to claim 1 on an outer peripheral surface.   A crank journal having fine concave portions processed by using the fine concave portion processing device according to claim 1 on an outer peripheral surface.   A crankpin having fine concave portions processed by using the fine concave portion processing apparatus according to claim 1 on an outer peripheral surface.   A cam journal having fine concave portions processed by using the fine concave portion processing apparatus according to claim 1 on an outer peripheral surface.   A cam lobe having fine concave portions processed by using the fine concave portion processing apparatus according to claim 1 on an outer peripheral surface.

Images