JP5969850B2 - Cylindrical workpiece cutting device and cleaning method thereof - Google Patents

Description

  The present invention relates to a cylindrical workpiece cutting device that forms a plurality of metal rings by cutting a metal cylindrical thin workpiece under the action of laser light, and a cleaning method therefor.

  As a power transmission belt employed in a continuously variable transmission of an automobile, a laminated ring in which a plurality of metal rings are laminated is used. For example, as described in Patent Document 1, the metal ring constituting this type of laminated ring is formed by first welding both end edges of a rectangular metal thin plate to form a cylindrical drum (thin workpiece). Next, the drum is produced by cutting the drum into a circular shape with a predetermined width. If necessary, a solution treatment may be performed after the welding for the purpose of improving the internal quality of the drum.

  Conventionally, a cutter such as a grindstone or a cutting tool has been mainly employed as a cutting means for cutting the drum. However, in Patent Document 2, the present applicant cuts the drum under the action of a laser beam and attaches a metal ring. Proposed cutting method.

  In this cutting method, after a drum is mounted on the side wall of a work holding member having a substantially cylindrical shape and having a reduced diameter, the drum is corrected to a substantially perfect circle by the side wall by expanding the diameter of the work holding member. Further, the laser beam is irradiated from the outer peripheral wall side of the drum while rotating the drum by rotating the work holding member. Here, a plurality of annular grooves extending along the circumferential direction are formed on the side wall of the work holding member, and laser light is emitted when the laser light irradiation means is positioned above each annular groove. .

JP 2005-297074 A JP 2011-167702 A

  In the drum irradiated with the laser beam, a part thereof is melted and scattered in the annular groove. That is, the molten scattered matter is captured in the annular groove. For this reason, generation | occurrence | production of dross in a drum is suppressed.

  Here, the molten scattered matter trapped in the annular groove is solidified in the annular groove (hereinafter, the solidified product is referred to as “sputter”). Therefore, if the position where the molten scattered matter is captured is close to the side wall of the work holding member, a part of the spatter may be exposed from the annular groove and come into contact with the drum. When such a situation occurs, the drum is pressed against the sputter from the inner peripheral surface side, so that it becomes difficult to correct the drum into a substantially perfect circle shape. There is also a concern that the drum may be damaged by sputtering during the contact.

  The present invention has been made to solve the above-described problem, and it is possible to prevent the spatter from being exposed from the annular groove, and for this reason, it is easy to correct the drum into a substantially circular shape, And it aims at providing the cylindrical workpiece | work cutting device which can wipe away the concern that a damage | wound enters a drum, and its cleaning method.

In order to achieve the above object, the present invention provides a cylindrical workpiece cutting device for cutting a rotating metal cylindrical thin workpiece with a laser beam irradiated from a laser beam irradiation means.
A workpiece holding member in which an annular groove extending along the circumferential direction is formed on a side wall that is passed through the through hole of the thin workpiece;
Fluid deriving means for deriving a fluid from the annular groove;
With
The fluid deriving means derives the fluid during or after cutting the thin workpiece.

  In this configuration, spatter generated by solidification of the molten scattered material flowing into the annular groove is pushed away from the annular groove by the fluid. That is, it is removed. Thereby, an annular groove can be cleaned easily.

  Therefore, it is avoided that a part of the sputter is exposed from the annular groove. For this reason, since it is avoided that a sputter | spatter contacts a drum, it is easy to correct a drum to a substantially perfect circle shape. In addition, it is possible to eliminate the concern that the drum may be damaged by sputtering.

In this case, as the fluid outlet means, as to derive a fluid toward a bottom surface of the annular groove, Ru provided as to derive the fluid toward the side surface of the annular groove. With such a configuration, it is possible to reduce the amount of spatter deposited on the bottom surface, and to move the position of spatter adhering to the side surface of the annular groove to the bottom surface side.

  It is preferable that a film is formed on at least the annular groove on the work holding member. In this case, it is easier to remove the spatter.

  As the fluid, fine particles of dry ice may be derived. Alternatively, water may be derived or compressed gas may be derived. In the case of compressed gas, there is an advantage that post-processing other than sputtering is unnecessary. In addition, the cost can be reduced.

  Of course, two or more types of cleaning with compressed gas, cleaning with high-pressure water, and cleaning with dry ice may be used in combination.

  The material of the coating is preferably selected so that it is easy to remove spatter and is difficult to peel off by a fluid. A suitable example of such a material is copper or a copper alloy. A coating made of copper or a copper alloy is particularly suitable in this case because it is difficult to peel off from the work holding member even when high-pressure water collides. In addition, the film which consists of copper or a copper alloy can be easily formed by plating, for example.

Further, the present invention is a cleaning method for a cylindrical workpiece cutting device for cutting a metal cylindrical thin workpiece held on a side wall of a workpiece holding member with a laser beam irradiated from a laser beam irradiation means. ,
A fluid is supplied to the annular groove formed in the side wall of the workpiece holding member and extending along the circumferential direction during or after the thin workpiece is cut.

  Thus, by supplying the fluid to the annular groove, the spatter can be easily removed. That is, since the annular groove is cleaned, it is avoided that a part of the sputter is exposed from the annular groove. As a result, since it is avoided that the sputter contacts the drum, it is easy to correct the drum into a substantially circular shape, and the concern that the drum may be damaged due to the spatter is eliminated.

  As described above, a compressed gas may be supplied as the fluid. Alternatively, high-pressure water may be supplied, or dry ice fine particles may be supplied. Of course, you may make it supply 2 or more types of the fine granules of compressed gas, water, and dry ice.

In any case, for the reasons described above, the fluid toward the bottom of the annular groove, that to supply the fluid toward the side surface of the annular groove.

  According to the present invention, since spatter is removed from the annular groove by leading the fluid to the annular groove, it is avoided that a part of the spatter is exposed in the annular groove. For this reason, it is avoided that a sputter contacts a drum.

  Therefore, it becomes easy to correct the drum into a substantially circular shape. In addition, it is possible to eliminate the concern that the drum may be damaged by sputtering.

It is a partial cross section top view of the cylindrical workpiece cutting device concerning an embodiment of the invention. It is a principal part cross-section side view of the cylindrical workpiece cutting device shown in FIG. It is a whole schematic perspective view of a workpiece holding member. It is a partial cross section figure which follows the longitudinal direction of a work holding member. It is a front view of the cylindrical workpiece cutting device shown in FIG. It is principal part side surface sectional drawing of the said cylindrical workpiece cutting device. FIG. 6 is a front view of the cylindrical workpiece cutting device at a position different from FIG. 5. It is a principal part cross-sectional side view which shows the state which the member for a press and the workpiece holding member expanded in diameter from FIG. FIG. 7 is a side cross-sectional view of a main part of the cylindrical workpiece cutting device in which the position of a discharge nozzle that is a fluid deriving unit is different from that in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a cylindrical workpiece cutting device and a cleaning method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a partial cross-sectional plan view of a cylindrical workpiece cutting device 10 according to the present embodiment, and FIG. 2 is a cross-sectional side view of an essential part. The cylindrical workpiece cutting device 10 includes a motor 14 for rotating the spindle 12, a workpiece holding member 16 that is connected to the spindle 12 and rotates following the spindle 12, and the workpiece holding member 16. It has a processing head 18 (see FIG. 2) as laser light irradiation means for irradiating laser light L to a predetermined position of a held metal cylindrical drum (thin workpiece) W.

  The cylindrical workpiece cutting device 10 has a base (not shown), and the first base 20 and the second base 22 shown in FIG. 1 are installed on the base. The first base 20 supports the motor 14, while the second base 22 is provided with a spindle support member 24 into which the spindle 12 is inserted. Note that a bearing 26 is interposed between the spindle support member 24 and the spindle 12, so that the spindle 12 is rotatably supported by the spindle support member 24.

  A first pulley 30 is fitted on the rotating shaft 28 of the motor 14. On the other hand, a second pulley 32 is fitted on one end of the spindle 12, and a timing belt 34 is stretched around the first pulley 30 and the second pulley 32. Accordingly, the spindle 12 starts rotating under the action of the motor 14 as will be described later.

  The spindle 12 is formed as a hollow body. That is, the inner hole 36 extends along the longitudinal direction inside the spindle 12.

  The inner hole 36 is opened at both end surfaces of the spindle 12 in the longitudinal direction, and the socket portion 40 of the pipe joint socket 38 is inserted into one of the inner holes 36. An air supply pipe (not shown) connected to the main body 41 of the pipe joint socket 38 via a pipe joint 42 is connected to a compressed air supply source that supplies compressed air that functions as a cooling medium. That is, the inner hole 36 functions as a compressed air flow passage through which compressed air supplied from a compressed air supply source and passed through the air supply pipe and the pipe joint 42 flows.

  The socket part 40 having a truncated cone shape in the pipe joint socket 38 is rotatable with respect to the main body.

  As shown in FIG. 2, the work holding member 16 is connected to the spindle 12 via a first connecting member 44 and a second connecting member 46. Specifically, a step 48 is formed at one end of the spindle 12, and the columnar protrusion 50 of the first connecting member 44 is inserted into the step 48, and one of the first connecting members 44 is inserted. The first connecting bolt 52 inserted from the end face is screwed into the end of the spindle 12.

  Then, the second connection bolt 54 inserted from one end surface of the second connection member 46 is screwed into the end portion of the first connection member 44. The second connecting bolt 54 is located on the inner peripheral side of the first connecting bolt 52.

  An annular insertion port 56 is formed at one end of the second connecting member 46. On the other hand, as shown in FIGS. 2 and 3, a small-diameter portion 58 having a smaller diameter than other portions is formed at one end portion of the work holding member 16, and the small-diameter portion 58 is formed in the insertion port 56. Inserted. The small-diameter portion 58 is embedded with a connecting pin 60 that extends toward the bottom of the insertion port 56. By fitting the connecting pin 60 into a fitting hole 62 formed in the bottom of the insertion port 56, the second connecting member 46 and the work holding member 16 are connected.

  A seal member 64 is provided on the inner wall of the insertion port 56. The seal member 64 seals between the second connecting member 46 and the work holding member 16, thereby preventing the compressed air from leaking.

  As shown in FIG. 3, the work holding member 16 includes a small diameter portion 58, a holding portion 66 having a larger diameter than the small diameter portion 58 and having a substantially cylindrical shape, and a large diameter as compared with the holding portion 66. It is a hollow body having a diameter damming portion 68. In other words, the workpiece holding member 16 is formed with an insertion through hole 70 extending along the longitudinal direction thereof. The insertion through hole 70 communicates with communication holes 72 and 74 formed through the first connection member 44 and the second connection member 46, respectively.

  A plurality of radial passages 76 are formed in the work holding member 16 in a radial manner from the insertion through hole 70 to the side wall (outer wall). That is, the diametrical passage 76 communicates with the insertion through hole 70.

  Each of the diametrical passages 76 extends along the longitudinal direction of the workpiece holding member 16. The diameter direction passage 76 formed so as to be cut out from the small diameter portion 58 to the middle of the damming portion 68 has a diameter direction passage formed so as to be cut out from the damming portion 68 to the middle of the small diameter portion 58. 76 are adjacent.

  A plurality of circumferential passages 78 (annular grooves) that extend along the circumferential direction of the side walls and communicate between adjacent radial passages 76 are formed on the sidewall of the holding portion 66 of the workpiece holding member 16. As can be understood from FIGS. 2 and 3, the circumferential passage 78 does not reach the insertion through hole 70. That is, the circumferential direction passage 78 does not directly communicate with the insertion through hole 70 but communicates with the insertion through hole 70 only through the diameter direction passage 76.

  As shown in FIG. 4, a film 79 is formed on the bottom and side surfaces of the circumferential passage 78. As will be described later, the presence of the coating 79 facilitates the removal of the spatter S (see FIG. 6) from the circumferential passage 78. Note that the coating 79 is not provided on the side wall of the holding portion 66.

  The material of the film 79 may be any material that can easily remove the sputter S, and suitable examples thereof include polytetrafluoroethylene and boron nitride. However, even when high-pressure water is supplied, peeling is unlikely to occur. Therefore, copper or copper alloy is particularly suitable.

  As shown in FIG. 2, a pressing member 80 is inserted into the workpiece holding member 16 configured as described above. Further, the first diameter changing member 82 and the first diameter changing member 82 are inserted into the pressing member 80. A two-diameter changing member 84 is inserted. Here, a predetermined clearance is provided between the first diameter changing member 82, the communication holes 72 and 74 of the first connecting member 44 and the second connecting member 46, and the insertion through hole 70 of the work holding member 16. Is formed.

  As shown in FIG. 2, the pressing member 80 is a hollow body. The pressing member 80 is formed with a plurality of slits (not shown) penetrating from the inner wall toward the outer wall so as to extend in the longitudinal direction. By forming such slits, the pressing member 80 can easily be elastically deformed.

  On the inner wall of the pressing member 80, two first cam portions 88 and 90 are formed which are tapered in diameter as they are separated from the left end and the right end (see particularly FIG. 2). The vicinity of the middle part of the inner wall of the pressing member 80 has a substantially equal diameter over a predetermined length.

  On the other hand, the first diameter changing member 82 includes a cylindrical portion 92 and a second cam portion 94 that is reduced in taper as it is inserted into the pressing member 80. It is inserted into the pressing member 80 so as to be in sliding contact with the first cam portion 88.

  The second diameter changing member 84 has a substantially frustoconical shape, and the side wall of the second diameter changing member 84 decreases in a tapered shape as it is inserted into the pressing member 80, and the cam portion is in sliding contact with the first cam portion 90. Function as. Hereinafter, this side wall is referred to as a second cam portion 96.

  The first diameter changing member 82 and the second diameter changing member 84 are formed with insertion holes 98 and 100 penetrating along the longitudinal direction, respectively. One connecting bar 102 is inserted into these insertion holes 98 and 100. Further, a coil that elastically urges the first diameter changing member 82 and the second diameter changing member 84 in a direction away from each other between the first diameter changing member 82 and the second diameter changing member 84. A spring 104 is arranged.

  A wide flange portion 106 is formed at the left end portion of the connecting bar 102 in FIG. One end surface of the flange portion 106 is seated on the accommodation step portion 108 formed at the end portion of the cylindrical portion 92 of the first diameter changing member 82.

  A disc-shaped body 110 having a diameter corresponding to the diameter of the insertion through hole 70 of the work holding member 16 is inserted into the bottom surface (the right end surface in FIG. 2) of the second diameter changing member 84. The disk-shaped body 110 and the second diameter changing member 84 are connected via a third connecting bolt 112.

  A disc-shaped cover member 116 is connected to the outside of the disc-shaped body 110 (the right end in FIG. 2) via a fourth connecting bolt 114. The diameter of the cover member 116 is set larger than the diameter of the insertion through hole 70. That is, the cover member 116 is not inserted into the insertion through hole 70.

  Projecting holes 118 and 120 are formed through the disc-shaped body 110 and the cover member 116, respectively.

  The right end portion of the connecting bar 102 in FIG. 2 is exposed through the insertion hole 100 of the second diameter changing member 84, the disk-shaped body 110, and the protrusion holes 118, 120 of the cover member 116. A screw portion 122 is formed at the exposed right end portion, and two tightening nuts 124 and 126 are screwed to the screw portion 122. The diameters of the tightening nuts 124 and 126 are set smaller than the diameter of the projecting hole 120 and larger than the diameter of the projecting hole 118.

  Further, in the vicinity of the outer peripheral wall of the drum W, as shown in FIG. 5, discharge nozzles 128 and 130 as fluid derivation means are arranged. Compressed gas is discharged from these discharge nozzles 128 and 130. The gas is not particularly limited, but nitrogen or air is particularly suitable because it is advantageous in terms of cost.

  The discharge nozzles 128 and 130 are separated from each other so as to form an angle θ of about 100 ° to 120 °. In other words, the discharge nozzles 128 and 130 are arranged so that the phases are different. It should be noted that the processing head 18 for irradiating the laser beam L is arranged so as to be out of phase with the discharge nozzles 128 and 130 so as not to prevent the laser beam L from being irradiated to the drum W. It is preferable to install (see FIG. 5).

  Here, while the discharge nozzle 128 is disposed substantially parallel to the side surface of the circumferential passage 78 and at the approximate center of both side surfaces, the discharge nozzle 130 is disposed on the side surface of the circumferential passage 78. It is installed so as to be inclined at an angle α of about 30 ° to 60 °. Therefore, as shown in FIG. 6, the compressed gas discharged from the discharge nozzle 128 flows toward the bottom surface of the circumferential passage 78. On the other hand, the compressed gas discharged from the discharge nozzle 130 goes to the side surface of the circumferential passage 78.

  A support frame (not shown) that supports the discharge nozzles 128 and 130 can be displaced along the longitudinal direction of the work holding member 16. Of course, during this displacement, the discharge nozzles 128 and 130 are displaced integrally with the support frame.

  The cylindrical workpiece cutting device 10 further includes a high-pressure water discharge nozzle 132 shown in FIG. The high-pressure water discharge nozzle 132 discharges high-pressure water that is a fluid toward the workpiece holding member 16. That is, the high-pressure water discharge nozzle 132 is also one of the fluid derivation means.

  As shown in FIG. 7, the high-pressure water discharge nozzle 132 is offset upstream in the rotational direction with respect to a line extending from the rotation center O of the work holding member 16, that is, a radius of the work holding member 16 (virtual line M <b> 1). Then, it faces the workpiece holding member 16. In other words, the virtual axis M2 of the high-pressure water led out from the high-pressure water discharge nozzle 132 forms an angle β with the virtual line M1. Hereinafter, for convenience, this angle β is referred to as a discharge angle.

  In the present embodiment, the case where the compressed gas and the high pressure water are derived as fluids is illustrated, but instead of these, dry ice fine particles may be derived from a nozzle (not shown). In other words, this nozzle (not shown) is also one of the fluid outlet means.

  The cylindrical workpiece cutting device 10 according to the present embodiment is basically configured as described above. Next, a cleaning method performed on the cylindrical workpiece cutting device 10 with respect to its operational effects. It explains in relation to.

  In manufacturing a metal ring for producing a power transmission belt used in a continuously variable transmission, for example, first, a rectangular metal thin plate is cut out, and the rectangular metal thin plate is bent to form both end edges. The drum W which is a cylindrical body is obtained by welding. In addition, as a metal thin plate, that whose thickness is about 0.3-0.4 mm is generally used. The metal thin plate is preferably made of maraging steel.

  When cutting the drum W, first, the side wall of the work holding member 16 is passed through the through-hole of the drum W from the small diameter portion 58 side. The drum W is blocked by the blocking portion 68 of the workpiece holding member 16 and is positioned on the holding portion 66. A slight clearance is formed between the outer wall of the holding portion 66 and the inner wall of the drum W.

  Thereafter, the workpiece holding member 16 is connected to the second connecting member 46 via the connecting pin 60, whereby the drum W is held by the cylindrical workpiece cutting device 10.

  As described above, the drum W may be distorted by heat during welding. Therefore, first, the drum W is pressed by expanding the diameter of the work holding member 16.

  Specifically, the tightening nuts 124 and 126 are screwed in the tightening direction. As a result, the tightening nuts 124 and 126 are displaced toward the second diameter changing member 84 side. Since the diameters of the tightening nuts 124 and 126 are larger than the diameter of the projecting hole 118, the tightening nuts 124 and 126 press the disk-shaped body 110 to change the second diameter changing member 84 into the first diameter change. Press toward the member 82 side.

  At the same time, as the tightening nuts 124 and 126 are screwed, the threaded portion 122 of the connecting bar 102 is pulled to the right in FIG. Thereby, the connection bar 102 is displaced toward the second diameter changing member 84 side.

  As described above, the flange portion 106 of the connecting bar 102 is seated on the accommodation step portion 108 of the first diameter changing member 82. Therefore, the first diameter changing member 82 is pulled by the connecting bar 102 that is displaced toward the second diameter changing member 84 side. In other words, the first diameter change member 82 follows the connecting bar 102 and is displaced toward the second diameter change member 84 side.

  That is, as shown in FIG. 8, both the first diameter changing member 82 and the second diameter changing member 84 are displaced so as to be inserted deep inside in the longitudinal direction of the pressing member 80, and at the same time, the coil spring. 104 compresses. Due to this displacement, the larger diameter portion of each of the second cam portions 94 and 96 of the first diameter changing member 82 and the second diameter changing member 84 contacts the first cam portions 88 and 90 of the pressing member 80. Get in touch. As a result, the first cam portions 88 and 90 are pressed from the second cam portions 94 and 96. The pressing force from the second cam portions 94 and 96 is directed outward in the diameter direction of the pressing member 80.

  By this pressing, the pressing member 80 is expanded in diameter. This is because the pressing member 80 is pressed in the direction toward the outside in the diametrical direction via the first cam portions 88 and 90 formed on the inner wall thereof. As described above, since the pressing member 80 is easily elastically deformed, this diameter expansion also proceeds easily.

  The expanded pressing member 80 presses the holding portion 66 of the work holding member 16 substantially evenly along the direction toward the outside in the diameter direction. As shown in FIG. 3, the workpiece holding member 16 is formed with a plurality of diameter direction passages 76 and circumferential direction passages 78. For this reason, the work holding member 16 is also rich in elasticity. That is, the workpiece holding member 16 is easily elastically deformed by being pressed from the pressing member 80, and expands the diameter substantially uniformly.

  For example, when the drum W is distorted and the inner diameter of the drum W is non-uniform, the side wall of the holding portion 66 abuts against a portion having the smallest inner diameter in the drum W during the diameter expansion. . On the other hand, a portion having an inner diameter larger than this portion is still separated from the side wall of the holding portion 66.

  As the diameter of the holding portion 66 further increases, the portion having the smallest inner diameter is expanded. Further, the side wall of the holding portion 66 abuts on a portion where the inner diameter of the drum W is slightly large.

  When the diameter of the holding portion 66 further increases, the portion having the smallest inner diameter is further expanded, and the portion having a slightly larger inner diameter is expanded. As the diameter of the holding portion 66 increases in this way, the side wall of the holding portion 66 comes into contact with the portion having the largest inner diameter in the drum W.

  At this time, the portion where the inner diameter is the smallest or the portion where the inner diameter is slightly larger than the portion is expanded to the extent that the inner diameter is substantially the same as the portion where the inner diameter is the largest. That is, the drum W is corrected so that its cross section has a substantially circular shape. For this reason, the distance (thickness) from the inner wall to the outer wall of the drum W is within the focal depth of the laser light L.

  As described above, the drum W is corrected. When the tightening nuts 124 and 126 are excessively screwed, the cover member 116 is blocked by the blocking portion 68 of the workpiece holding member 16, and the disk-shaped body 110, and thus the first diameter changing member 82 and the first diameter changing member 82. Further displacement of the two-diameter changing member 84 is stopped. Thereby, the diameter expansion of the pressing member 80 and the holding part 66 is also stopped.

  Thereafter, the tightening nuts 124 and 126 may be screwed in the direction of loosening in the reverse manner. At this time, the coil spring 104 elastically biases both the first diameter changing member 82 and the second diameter changing member 84 in a direction away from each other. As a result, the first diameter-changing member 82 and the second diameter-changing member 84 are displaced in a direction away from the inside of the pressing member 80.

  Therefore, in each of the second cam portions 94 and 96 of the first diameter changing member 82 and the second diameter changing member 84, the small diameter portion is in contact with the first cam portions 88 and 90 of the pressing member 80. Become. For this reason, the first cam portions 88 and 90 are released from being pressed by the second cam portions 94 and 96. In other words, since there is no pressing force for expanding the pressing member 80, the pressing member 80 is reduced in diameter.

  Accordingly, the holding portion 66 of the work holding member 16 is also reduced in diameter. This is because the work holding member 16 is released from the pressing force of the pressing member 80.

  When the diameter of the holding portion 66 is reduced, for example, the state shown in FIG. 2, that is, the initial state before the diameter expansion may be returned, or the diameter may be returned to a slightly larger diameter than the initial state. Good. Even when the holding portion 66 of the workpiece holding member 16 and the pressing member 80 are returned to the initial state, the drum W does not have much elasticity, so that the original shape is restored from the corrected shape. There is no. That is, the corrected substantially perfect circle shape is maintained.

  Next, the motor 14 is driven. With this driving, the rotating shaft 28 of the motor 14 starts rotating. Following this rotation operation, the first pulley 30 rotates and the timing belt 34 rotates. As a result, the second pulley 32 rotates. Following this, the spindle 12 and the work holding member 16 connected to the spindle 12 start rotating.

  The rotational driving force of the motor 14 is preferably set so that the rotational speed of the drum W held by the work holding member 16 is a peripheral speed of 30 to 200 m / min. As described above, since the bearing 26 is interposed between the spindle 12 and the spindle support member 24, the spindle support member 24 does not rotate. Further, in the pipe joint socket 38, only the socket portion 40 rotates, and the main body portion 41 does not rotate.

  Before and after this, compressed air as a cooling medium is supplied from the compressed air supply source. The compressed air reaches the pipe joint socket 38 via the air supply pipe and the pipe joint 42 and is supplied from the socket portion 40 to the inner hole 36 of the spindle 12. The workpiece holding member 16 is cooled by the compressed air (cooling medium), and as a result, the workpiece holding member 16 functions as a cooling metal for cooling the drum W.

  Next, the laser beam L is irradiated from the processing head 18 toward the drum W. In the present embodiment, the laser beam L is first irradiated near the right end of the drum W in FIG. 2, in other words, the most downstream side to which compressed air is supplied. At this time, the portion irradiated with the laser light L and the position of the circulation direction passage 78 substantially coincide with each other.

  The portion of the drum W where the laser beam L is incident is sublimated due to an increase in temperature, and is separated from the drum W. That is, it is cut as a metal ring.

  Here, the distance (thickness) from the inner wall to the outer wall of the drum W is within the focal depth of the laser light L by correction as described above. Accordingly, it is possible to irradiate the drum W with the laser light L having a relatively small condensing diameter and high energy density. As a result, most of the metal material at the cut portion of the drum W can be sublimated rather than melted during irradiation. That is, the drum W can be removed while reducing the melting amount as much as possible. Therefore, it is possible to reduce the amount of the molten scattered matter generated by the cutting while reducing the thermal influence on the drum W.

  At the time of this cutting, a melt of a metal (for example, maraging steel) that is the material of the drum W scatters and enters the circumferential passage 78. Since the workpiece holding member 16 functions as a cooling metal, the molten scattered matter is cooled and solidified relatively quickly on the bottom surface or side surface of the circumferential passage 78 to become the sputter S.

  In the work holding member 16, the coating 79 is not formed on the side wall surface in contact with the inner peripheral surface of the drum W. For this reason, it is possible to prevent material contamination (so-called contamination) from the film 79 from occurring in the metal ring.

  Since the portion irradiated with the laser beam L and the position of the circumferential direction passage 78 substantially coincide with each other, after the metal ring is cut, the circumferential direction passage 78 to which the sputter S is attached is exposed. In the present embodiment, compressed gas such as compressed air is supplied from the discharge nozzles 128 and 130 to the exposed circulation passage 78.

  The compressed gas discharged from the discharge nozzles 128 and 130 flows toward the bottom surface and the side surface of the circumferential passage 78, respectively. That is, an airflow that collides with the bottom surface and the side surface of the circumferential passage 78 is generated. For this reason, the sputter S is removed by the air flow, whereby the bottom surface and the side surface of the circumferential passage 78 are cleaned. In addition, since the coating 79 is formed on the bottom and side surfaces of the circumferential passage 78, the spatter S is easily removed.

  For example, when blowing is performed with only the discharge nozzle 128 provided when the depth of the circumferential passage 78 is set to about 20 mm, the depth from the opening of the circumferential passage 78 is about 5 mm on the side of the circumferential passage 78. Sputter S adheres to the position. That is, it is possible to deepen the deposition position of the sputter S as compared with the case where blow is not performed.

  Further, when the discharge nozzles 128 and 130 are provided and blow is performed at the same time, the deposition position of the sputter S on the side surface of the circumferential passage 78 is about 10 mm deep from the opening of the circumferential passage 78. That is, the attachment position of the sputter S moves to the bottom side. For this reason, it is more effectively avoided that a part of the spatter S is exposed from the circumferential passage 78 and comes into contact with the drum W. Therefore, the drum W is prevented from being pressed by the sputter S from the inner peripheral surface side. As a result, it becomes easy to correct the drum W into a substantially perfect circle shape, and the sputter S may cause damage to the drum W. Can be wiped off.

  The removed spatter S is captured by a sputter S receiving member (not shown) provided on the floor of the work station.

  While cleaning is performed as described above, the machining head 18 moves and irradiates the laser beam L to another portion of the drum W as shown in FIG. Also in this case, the machining head 18 moves to a position corresponding to the position of the circumferential passage 78, and then the drum W is cut in the same manner as described above.

  Thereafter, the discharge nozzles 128 and 130 are moved together with the support frame to this position, and the above-described cleaning is performed. During this time, the processing head 18 moves to a position where cutting is to be performed next, and irradiates the laser beam L to another part of the drum W. This is repeated until a predetermined number of metal rings are obtained.

  When the above-described cutting is repeated for another drum W, spatter S that cannot be removed by blowing is deposited on the bottom surface of the circumferential passage 78. In order to remove such spatter S, high-pressure water is discharged from the high-pressure water discharge nozzle 132 toward the work holding member 16 after the cutting of the predetermined number of drums W is completed. That is, washing is performed with high-pressure water.

  Here, in the present embodiment, as shown in FIG. 7, the high-pressure water discharge nozzle 132 is disposed at a position offset from the rotation center line of the work holding member 16. Accordingly, high-pressure water enters the drum W with a discharge angle β. In such cleaning, the removal amount of the sputter S increases as compared with the case where the offset is not provided. That is, the sputter S can be sufficiently removed.

  In addition, since the coating 79 is formed on the bottom and side surfaces of the circumferential passage 78, the sputter S is easily removed even in this case. In the case where the coating 79 is made of copper or a copper alloy, the coating 79 is not easily peeled off from the bottom and side surfaces of the circumferential passage 78 even when high-pressure water collides. Accordingly, it is preferable because the sputter S can be easily removed over a long period of time.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, in this embodiment, a metal ring that constitutes a power transmission belt employed in a continuously variable transmission of an automobile is manufactured. However, other metal rings may be manufactured. Of course.

  In addition, as shown in FIG. 9, the discharge nozzles 128 and 130 may be provided at a position where blowing is performed with respect to the separate circumferential passage 78.

  Further, the discharge from the discharge nozzles 128 and 130 may be performed simultaneously with the cutting of the drum W.

DESCRIPTION OF SYMBOLS 10 ... Cylindrical workpiece cutting device 12 ... Spindle 14 ... Motor 16 ... Work holding member 18 ... Processing head 76 ... Diameter direction passage 78 ... Circumferential direction passage 80 ... Pressing member 82 ... First diameter changing member 84 ... Second diameter Change member 88, 90 ... 1st cam part 94, 96 ... 2nd cam part 104 ... Coil spring 124, 126 ... Fastening nut 128, 130 ... Discharge nozzle 132 ... High pressure water discharge nozzle L ... Laser beam S ... Sputter W …drum

Claims (10)

In a cylindrical workpiece cutting device for cutting a rotating metal cylindrical thin workpiece with a laser beam irradiated from a laser beam irradiation means,
A workpiece holding member in which an annular groove extending along the circumferential direction is formed on a side wall that is passed through the through hole of the thin workpiece;
Fluid deriving means for deriving a fluid from the annular groove;
With
It said fluid outlet means, before Symbol after or during cutting to cut a thin workpiece, the fluid toward the bottom of the annular groove, the cylindrical workpiece cutting, characterized in that to derive the fluid toward the side surface of the annular groove apparatus. In claim 1 Symbol placement of the cutting device, wherein the workpiece holding member, a cylindrical workpiece cutting apparatus characterized by being formed coating on at least the annular groove. 3. The cutting apparatus according to claim 1, wherein fine particles of dry ice are derived as the fluid. 3. The cutting apparatus according to claim 1, wherein water is led out as the fluid. The cutting apparatus according to claim 1 or 2 , wherein a compressed gas is led out as the fluid. The cutting apparatus according to claim 2 , wherein the coating is made of copper or a copper alloy. A method for cleaning a cylindrical workpiece cutting device for cutting a metal cylindrical thin workpiece held on a side wall of a workpiece holding member with a laser beam irradiated from a laser beam irradiation means,
The annular groove formed on the side wall of the workpiece holding member and extending along the circumferential direction, during or after the cutting of the thin workpiece , the fluid moving toward the bottom surface of the annular groove, and the annular groove cleaning of the cylindrical workpiece cutting apparatus, characterized by supplying the fluid towards the sides. The cleaning method according to claim 7 , wherein a compressed gas is supplied as the fluid. The cleaning method according to claim 7 , wherein water is supplied as the fluid. The cleaning method according to claim 7 , wherein fine particles of dry ice are supplied as the fluid.

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