JP7053933B1 - Work processing method and laser processing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work processing method and a laser processing machine capable of processing a plurality of recesses having a desired shape in a work while shortening the processing time of the work. SOLUTION: The work processing method alternately executes an irradiation section Sa that irradiates a work W with a flat laser beam in a pulse shape and a stop section Sb that stops the irradiation of the flat laser light. The angle between the step of emitting flat laser light from the laser light emitting part, the moving direction of the work W and the laser light emitting part, and the long axis direction of the flat laser light is the movement of the work W and the laser light emitting part. On the work W where the flat laser light is irradiated in each irradiation section Sa between the irradiation sections Sa which are larger than the angle formed by the direction and the short axis direction of the flat laser light and are executed a plurality of times. The work W and the laser beam emitting portion are relatively moved so that the regions of the above are not overlapped with each other. [Selection diagram] FIG. 8

Description

The present invention relates to a work processing method and a laser processing machine.

For example, Japanese Patent Application Laid-Open No. 2009-131896 (Patent Document 1) discloses a roller processing method for forming a plurality of recesses on the surface of a roller made of a metal material. The roller processing method disclosed in Patent Document 1 includes a step of rotating a roller, a step of detecting the position of the rotated roller, and irradiating the same spot on the surface of the roller with laser light each time the roller rotates. This is repeated a plurality of times to provide a step of forming a recess on the surface of the roller.

Japanese Unexamined Patent Publication No. 2009-131896

A work processing method for processing a plurality of recesses on the work surface by irradiating a work with a laser beam from a laser head is known. In such a work processing method, a plurality of recesses may be machined on the work surface by alternately repeating irradiation of laser light from the laser head toward the work and movement and stop of the laser head and / or the work. is assumed.

However, in this case, it takes time to accelerate / decelerate the laser head and / or the work between irradiations of the laser light, so that the processing time of the work becomes long. On the other hand, when the laser beam is irradiated while the laser head and / or the work is moved, the irradiation region of the laser light extends in the relative moving direction of the laser head and the work, so that a recess having a desired shape is machined. I can't.

Therefore, an object of the present invention is to solve the above-mentioned problems, and a work processing method and a laser processing machine capable of processing a plurality of recesses having a desired shape in the work while shortening the processing time of the work. Is to provide.

In the work processing method according to the present invention, an irradiation section in which the flat laser light is continuously or pulsed toward the work and a stop section in which the irradiation of the flat laser light on the work is stopped are alternately executed. As described above, a step of emitting a flat laser beam from the laser beam emitting portion is provided. The flat laser beam is flat including the minor axis direction and the major axis direction having a length orthogonal to the minor axis direction and larger than the length in the minor axis direction when cut by a plane orthogonal to the optical axis. Has a cross section. In the work processing method, the angle between the moving direction of the work and the laser light emitting part and the long axis direction is α when viewed in the optical axis direction of the flat laser light emitted from the laser light emitting part toward the work. When the angle between the moving direction of the work and the laser beam emitting part and the short axis direction is β (α + β = 90 °), the angle α is larger than the angle β and smaller than 90 °. In addition, between the irradiation sections executed multiple times, the irradiation section and the stop section are set by the laser beam emitting part so that the regions on the work to be irradiated with the flat laser light do not overlap each other in each irradiation section. It further comprises a step of relatively moving the workpiece and the laser beam emitting part while being executed alternately. The work has a cylindrical shape. At the step of emitting the flat laser light, the flat laser light is emitted from the laser light emitting portion toward the peripheral surface of the work. During the step of relatively moving, the work and the laser light emitting part are moved relatively in the axial direction of the work, and at the same time, the laser light emitting part is moved relative to the work in the circumferential direction of the work. Scan spirally.

According to the work processing method configured in this way, the work and the laser light emitting section are relatively moved by the moving mechanism section while the irradiation section and the stop section are alternately executed by the laser light emitting section. .. As a result, it is possible to machine a plurality of recesses in the work while continuing to move the work and the laser beam emitting portion relatively, so that the processing time of the work can be shortened. Further, the moving mechanism unit ensures that the angles α and β formed by the moving directions of the work and the laser beam emitting portion and the major axis direction and the minor axis direction of the flat laser beam satisfy the relationship of α> β, respectively. The work and the laser beam emitting part are relatively moved. As a result, the region on the surface of the work to which the flat laser light is irradiated in each irradiation section is suppressed from extending in the moving direction of the work and the laser beam emitting portion, and a plurality of recesses having a desired shape in the work are suppressed. Can be processed.

Also preferably, the angle α is 90 °.

According to the work processing method configured in this way, the flat laser light is generated in each irradiation section by making the moving direction of the work and the laser light emitting portion and the long axis direction of the flat laser light orthogonal to each other. It is possible to more effectively suppress the region on the surface of the irradiated work from extending in the moving direction of the work and the laser beam emitting portion.

Also preferably, the flat laser beam has an oval cross section.

According to the work processing method configured in this way, the angles α and β formed by the moving directions of the work and the laser beam emitting portion and the major axis direction and the minor axis direction of the flat laser beam having an elliptical cross section, respectively. However, by satisfying the relationship of α> β, it is possible to prevent the region on the surface of the work to be irradiated with the flat laser light in each irradiation section from extending in the moving direction of the work and the laser light emitting portion.

Further, preferably, during the step of relatively moving, the work and the laser beam emitting portion are relatively moved at a constant speed.

According to the work processing method configured in this way, it is possible to machine a plurality of recesses in the work while simplifying the control of the laser light emitting portion and the moving mechanism portion.

Further, preferably, at the step of emitting the flat laser light, the flat laser light is irradiated toward the work in a pulse shape in the irradiation section.

According to the work processing method configured in this way, it is possible to suppress the occurrence of thermal damage to the work due to the laser beam.

Also preferably, the work has a cylindrical shape. At the step of emitting the flat laser light, the flat laser light is emitted from the laser light emitting portion toward the peripheral surface of the work. During the step of relatively moving, the work and the laser beam emitting portion are moved relatively in the axial direction of the work and in the circumferential direction of the work.

According to the work processing method configured in this way, it is possible to process a plurality of spirally arranged recesses on the peripheral surface of a work having a cylindrical shape in a short time and with high accuracy.

Further, preferably, at the step of emitting the flat laser light, the flat laser light is emitted toward the peripheral surface of the work from a plurality of laser light emitting portions arranged at intervals in the axial direction of the work.

According to the work processing method configured in this way, it is possible to process a plurality of spirally arranged recesses in a shorter time on the peripheral surface of the work having a cylindrical shape.

A laser processing machine according to the present invention includes an optical component that converts a laser beam into a flat laser beam. The flat laser beam is flat including the minor axis direction and the major axis direction having a length orthogonal to the minor axis direction and larger than the length in the minor axis direction when cut by a plane orthogonal to the optical axis. Has a cross section. The laser processing machine alternately executes an irradiation section in which the flat laser light is continuously or pulsed toward the work and a stop section in which the flat laser light is stopped irradiating to the work. When viewed in the optical axis direction of the laser beam emitting section that emits the laser beam and the flat laser beam emitted from the laser beam emitting section toward the work, the moving direction of the work and the laser beam emitting section and the long axis direction. When the angle formed by is α and the angle formed by the moving direction of the work and the laser beam emitting portion and the minor axis direction is β (α + β = 90 °), the angle α is larger than the angle β and is 90. By the laser light emitting part so that the regions on the work to be irradiated with the flat laser light in each irradiation section do not overlap each other in the range smaller than ° and between the irradiation sections executed multiple times. Further, a moving mechanism unit for relatively moving the work and the laser light emitting unit while the irradiation section and the stop section are executed alternately is provided. When the work has a cylindrical shape, the laser beam emitting portion emits a flat laser beam toward the peripheral surface of the work. The moving mechanism unit moves the work and the laser light emitting part relatively in the axial direction of the work, and at the same time, moves the work and the laser light emitting part relatively in the circumferential direction of the work, thereby causing the laser light emitting part to spiral with respect to the work. Scan to.

According to the laser processing machine configured as described above, it is possible to process a plurality of recesses having a desired shape in the work while shortening the processing time of the work.

As described above, according to the present invention, there is provided a work processing method and a laser processing machine capable of processing a plurality of recesses having a desired shape in the work while shortening the processing time of the work. Can be done.

It is a figure which shows the state of the work processing using the work processing method in embodiment of this invention. It is another figure which shows the state of the work processing using the work processing method in embodiment of this invention. It is still another figure which shows the state of the work processing using the work processing method in embodiment of this invention. It is a figure which shows typically the route where the laser beam emitting part is scanned with respect to a work. It is a graph which shows the change of the laser output of the laser beam emitted from the laser beam emitting part schematically. It is a graph which shows the change of the laser output of the laser beam in FIG. 5 more concretely. It is a figure which shows the pulse energy, the pulse interval and the number of pulses. It is a figure which shows typically the relationship between the irradiation section and the stop section in FIG. 5 and the irradiation area of the laser beam on the work surface. It is sectional drawing which shows the work seen in the direction of the arrow on the IX-IX line in FIG. It is a figure which shows the deformation example of the angle formed by the moving direction of the work and the laser beam emitting part in FIG. 3 and the long axis direction and the short axis direction of a flat laser beam. It is a graph which shows the modification of the change of the laser output of the laser beam shown in FIG. 5 schematically. It is a figure which shows the modification of the form of irradiation of a flat laser beam toward a work.

Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are assigned the same number.

1 to 3 are views showing a state of work processing using the work processing method according to the embodiment of the present invention. With reference to FIGS. 1 to 3, the work processing method in the present embodiment is a method of processing the work W by laser processing.

The work W is made of a metal such as cast iron. The work W has a cylindrical shape centered on the central axis 110. The work W is a cylinder liner and is inserted into a cylinder bore provided in the engine block.

The work processing method in the present embodiment is a method for forming a plurality of recesses on the surface of the work W. The work processing method is a method for forming a plurality of recesses (dimples) spirally arranged around the central axis 110 on the inner peripheral surface of the work W. The laser processing machine 10 is used in the work processing method in the present embodiment.

Hereinafter, the structure of the laser processing machine 10 and the work processing method in the present embodiment when the laser processing machine 10 is used will be described. The laser processing machine 10 has a laser head 31 and a laser oscillator 41.

The laser oscillator 41 oscillates the laser beam used for processing the work W. The laser light oscillated by the laser oscillator 41 is guided to the laser head 31 through the optical fiber 42. The laser head 31 irradiates the work W with the laser light from the laser oscillator 41. The laser head 31 irradiates the laser beam toward the inner peripheral surface of the work W.

The laser head 31 has a head main body 32 and a laser light emitting unit 33. An optical fiber 42 is connected to the head body 32.

The laser light emitting unit 33 is provided integrally with the head body 32. When processing the work W, the laser beam emitting unit 33 is positioned so as to face the work W. The laser light emitting unit 33 (laser head 31) is arranged inside the work W having a cylindrical shape. The laser beam emitting unit 33 is positioned so as to face the inner peripheral surface of the work W.

The laser head 31 further includes a first optical component 34, a second optical component 35 (corresponding to the "optical component" in the present invention), and a third optical component 36.

The first optical component 34, the second optical component 35, and the third optical component 36 are provided on the optical path of the laser beam in the laser head 31. The first optical component 34, the second optical component 35, and the third optical component 36 are arranged in the order listed from the upstream side to the downstream side of the optical path of the laser beam in the laser head 31. The first optical component 34 and the second optical component 35 are arranged on the head main body 32. The third optical component 36 is arranged in the laser beam emitting unit 33.

The first optical component 34 converts the laser light guided from the laser oscillator 41 to the laser head 31 into parallel light. The first optical component 34 includes a collimation lens.

The second optical component 35 converts the laser beam from the first optical component 34 into a flat laser beam. The second optical component 35 includes a cylindrical lens. The second optical component 35 may include a mask provided with a flat opening. The second optical component 35 may include a diffractive optical element (DOE).

The third optical component 36 collects the flat laser beam from the second optical component 35 on the surface of the work W. The third optical component 36 includes a condenser lens.

The laser light emitting unit 33 emits the flat laser light L from the third optical component 36. The flat laser beam L emitted from the laser beam emitting unit 33 travels straight around the optical axis 120 and irradiates the surface (inner peripheral surface) of the work W.

The laser head 31 may be further provided with an optical component such as a mirror for changing the traveling direction of the laser beam or a protective glass for protecting the lens or the like. The laser beam may be spatially transmitted by a mirror or an optical fiber to a processing position on the work.

As shown in FIG. 3, when the flat laser beam L is cut by a plane 180 orthogonal to the optical axis 120, the flat laser beam L is in the minor axis direction (direction indicated by the arrow 160) and the minor axis direction (in the arrow 160). It has a flat cross section that is orthogonal to the direction indicated) and includes a major axis direction (direction indicated by arrow 170) of length db that is greater than length da in the minor axis direction (direction indicated by arrow 160). The flat laser beam L has an oval cross section.

The flat cross section of the flat laser beam is not limited to the above-mentioned oval shape, and may be a polygon such as a rhombus, a rectangle, or a parallel quadrilateral, or two straight lines parallel to each other. The track shape may be a combination of a semicircle connected to one end of the two straight lines and a semicircle connected to the other end of the two straight lines.

The flat shape of the flat laser beam preferably has a symmetrical shape with a straight line extending in the short axis direction passing through the optical axis 120. The flat shape of the flat laser beam preferably has a symmetrical shape with a straight line extending in the long axis direction passing through the optical axis 120.

The flat laser beam L emitted from the laser beam emitting unit 33 forms an irradiation region G on the surface (inner peripheral surface) of the work W to be irradiated with the laser beam. The irradiation region G has a flat shape, more specifically, an oval shape.

FIG. 4 is a diagram schematically showing a route in which the laser beam emitting portion is scanned with respect to the work. With reference to FIGS. 1 to 4, the laser beam machine 10 further includes a moving mechanism unit 21. The moving mechanism unit 21 relatively moves the work W and the laser beam emitting unit 33. The moving mechanism unit 21 relatively moves the work W and the laser beam emitting unit 33 at a constant speed.

The laser machine 10 further includes a first moving mechanism unit 21A and a second moving mechanism unit 21B as the moving mechanism unit 21.

The first moving mechanism unit 21A moves the laser light emitting unit 33 (laser head 31) with respect to the work W. The first moving mechanism unit 21A moves the laser light emitting unit 33 (laser head 31) in the axial direction of the central axis 110 of the work W.

The first moving mechanism portion 21A has a main body portion 22 and an arm portion 23. The arm portion 23 extends from the main body portion 22 and is connected to the laser head 31 (head main body 32). The arm portion 23 extends in the axial direction of the central axis 110 of the work W. The main body 22 has a built-in linear actuator for moving the arm 23 forward and backward along the axial direction of the central axis 110 of the work W. The linear actuator may be, for example, a combination of a motor and a rack and pinion that converts a rotary motion output from the motor into a linear motion and transmits it to the arm portion 23.

The second moving mechanism unit 21B moves the work W with respect to the laser light emitting unit 33. The second moving mechanism unit 21B rotates the work W about the central axis 110.

The second moving mechanism unit 21B is composed of a work spindle. The second moving mechanism unit 21B has a chuck 24. The chuck 24 holds the work W detachably. The second moving mechanism unit 21B rotates the work W held by the chuck 24 around the central shaft 110 by driving the motor.

With such a configuration, the moving mechanism unit 21 (first moving mechanism unit 21A, second moving mechanism unit 21B) makes the work W and the laser light emitting unit 33 in the axial direction of the work W (the axial direction of the central axis 110). In addition, the work W is relatively moved in the circumferential direction (circumferential direction around the central axis 110). The laser beam emitting unit 33 is spirally scanned about the central axis 110 with respect to the work W while maintaining the posture facing the inner peripheral surface of the work W.

In addition, in FIGS. 3 and 4 and later in FIGS. 8, 10 and 12, the relative movement directions of the work W and the laser beam emitting unit 33 (extending spirally around the central axis 110). Direction) is indicated by the arrow D.

The moving mechanism unit 21 may move the laser light emitting unit 33 (laser head 31) with respect to the stationary work W in the axial direction of the work W and in the circumferential direction of the work W. The work W may be moved (operated) in the axial direction of the work W and in the circumferential direction of the work W with respect to the stationary laser light emitting unit 33 (laser head 31). The moving mechanism portion in the present invention is not particularly limited as long as the work and the laser beam emitting portion can be relatively moved along with the machining of the work.

FIG. 5 is a graph schematically showing changes in the laser output (pulse output) of the laser light emitted from the laser light emitting unit. FIG. 6 is a graph showing a change in the laser output of the laser beam in FIG. 5 more specifically. FIG. 7 is a diagram showing pulse energy, pulse interval and pulse number.

With reference to FIGS. 5 to 7, the laser beam emitting unit 33 stops the irradiation section Sa that pulsates the flat laser beam L toward the work W and the irradiation of the flat laser beam L on the work W. The flat laser beam L is emitted so as to alternately execute the stop section Sb.

In the irradiation section Sa, the pulse wave of the flat laser beam L is continuously emitted from the laser beam emitting unit 33. The pulse wave is a femtosecond laser with a pulse width on the order of 1 × ^10-15 s. The pulse energy of the pulse wave (corresponding to the area K in FIG. 6) is, for example, 1 μJ. The pulse wave interval (pulse interval) is, for example, 0.2 μs. The wave number (pulse number) of the pulse wave in each irradiation section Sa is, for example, 50. The time (t2-t1) of each irradiation section Sa is, for example, 10 μs. The time of each irradiation section Sa may be less than 10 μs or less than 5 μs.

As the pulse wave, a picosecond laser having a pulse width on the order of 1 × ^10-12 s may be used. By using a femtosecond laser or a picosecond laser, the thermal effect on the work can be suppressed more effectively. Further, since the laser oscillator 41 can oscillate from 1 shot to several tens of MHz, it is possible to irradiate the laser at intervals of 0.1 μs as shown in FIGS. 6 and 7, and a large number of laser pulses can be emitted. Therefore, the productivity can be improved.

In the stop section Sb, the emission of the flat laser beam L from the laser beam emitting unit 33 is stopped. The time (t3-t2) of each stop section Sb may be longer than or equal to the time (t2-t1) of each irradiation section Sa, or may be less than the time (t2-t1) of each irradiation section Sa. The irradiation section Sa and the stop section Sb are alternately and repeatedly executed.

FIG. 8 is a diagram schematically showing the relationship between the irradiation section and the stop section in FIG. 5 and the irradiation region of the laser beam on the work surface. FIG. 9 is a cross-sectional view showing a work seen in the direction of arrow on the IX-IX line in FIG.

With reference to FIGS. 1 to 9, the moving mechanism unit 21 (first moving mechanism unit 21A, second moving mechanism unit 21B) is from the moving direction of the work W and the laser light emitting unit 33 and from the laser light emitting unit 33. The flat laser beam L emitted toward the work W has an orthogonal relationship with the long axis direction, and the flat laser beam L is irradiated in each irradiation section Sa between the irradiation sections Sa executed a plurality of times. The work W and the laser light emitting unit 33 are relatively moved while the irradiation section Sa and the stop section Sb are alternately executed by the laser light emitting unit 33 so that the regions J on the work W do not overlap each other. ..

As shown in FIGS. 3 and 8, the relative moving direction (direction indicated by the arrow D) of the work W and the laser beam emitting unit 33 is the long axis direction (indicated by the arrow 170) in the flat laser beam L. Direction). The relative moving direction (direction indicated by the arrow D) of the work W and the laser beam emitting unit 33 is parallel to the short axis direction (direction indicated by the arrow 160) in the flat laser beam L.

As shown in FIGS. 8 and 9, the moving mechanism unit 21 (first) while emitting the flat laser light L from the laser light emitting unit 33 so that the irradiation section Sa and the stop section Sb are alternately executed. The work W and the laser beam emitting unit 33 are relatively spirally moved around the central axis 110 of the work W by the moving mechanism unit 21A and the second moving mechanism unit 21B). As a result, a plurality of recesses 51 spirally arranged around the central axis 110 are formed on the surface (inner surface) of the work W.

The depth H of the recess 51 is, for example, 3 μm or more and 10 μm or less. The diameter of the recess 51 is, for example, 10 μm or more and 50 μm or less. The depth of the recess 51 is equal to or less than the diameter of the recess 51. The depth of the recess 51 may be larger than the diameter of the recess 51.

In each irradiation section Sa, the concave portion 51 is formed by irradiating the surface (inner peripheral surface) of the work W with the pulse-shaped flat laser beam L. More specifically, on the surface (inner peripheral surface) of the work W, an irradiation region G of the laser beam is formed each time the pulse wave of the flat laser beam L is irradiated. While the work W and the laser light emitting unit 33 move relatively, a plurality of pulse waves are irradiated at a constant pulse interval, so that the plurality of irradiation regions G partially overlap each other in the adjacent irradiation regions G. However, the work W and the laser beam emitting unit 33 are formed side by side in the moving direction. The recess 51 is formed by applying pulse energy to a range corresponding to a plurality of irradiation regions G and non-thermally evaporating and plasmaizing the work W.

On the other hand, in each stop section Sb, the irradiation of the flat laser beam L is stopped, so that a non-processed region is provided between the adjacent recesses 51.

In the region J on the work W to which the flat laser beam L is irradiated in each irradiation section Sa, a plurality of regions J arranged in the moving direction of the work W and the laser beam emitting portion 33 while the adjacent irradiation regions G partially overlap each other. It corresponds to the irradiation area G. The plurality of regions J are spirally arranged around the central axis 110 without overlapping each other.

In the work processing method of the present embodiment, since the work W and the laser light emitting unit 33 are continuously moved while the work W is machined with a plurality of recesses 51, the work W and the laser light emitting unit 33 are relative to each other. The machining time of the work W can be shortened as compared with the case where the movement and stop are repeated and the irradiation of the laser beam is repeated.

Further, since the long axis direction of the flat laser beam L having an oval cross section and the moving direction of the work W and the laser beam emitting unit 33 are orthogonal to each other, the work W and the laser beam emitting unit 33 are in each irradiation section Sa. A plurality of irradiation regions G having a major axis radius in a direction orthogonal to the moving direction of 33 and a minor axis radius in a direction parallel to the moving direction of the work W and the laser beam emitting unit 33 are the work W and the laser beam. It is formed side by side in the moving direction of the emitting unit 33. As a result, the recess 51 having a desired shape having an aspect ratio close to 1 can be formed in the work W. In addition, since the flat laser beam L is irradiated toward the work W in a pulse shape, it is possible to suppress thermal damage (heat dripping) due to the laser beam on the work W. As a result, the shape of the recess 51 can be finished with higher accuracy.

FIG. 10 is a diagram showing an example of deformation of the angle formed by the moving direction of the work and the laser beam emitting portion in FIG. 3 and the major axis direction and the minor axis direction of the flat laser beam.

With reference to FIG. 10, when viewed in the axial direction of the optical axis 120 of the flat laser beam L emitted from the laser beam emitting section 33 toward the work W, the moving direction (arrow) of the work W and the laser beam emitting section 33. The angle formed by the long axis direction (direction indicated by the arrow 170) of the flat laser beam L (direction indicated by D) is α, and the moving direction of the work W and the laser beam emitting unit 33 (indicated by arrow D). The angle formed by the direction formed by the flat laser beam L and the minor axis direction (direction indicated by the arrow 160) is β (α + β = 90 °). In this case, the angle α becomes larger than the angle β (α> β). In this modification, the angle α is in a range larger than 45 ° and smaller than 90 °.

The angle α may be 60 ° or more, 80 ° or more, or 85 ° or more.

As shown in this modification, the moving direction of the work W and the laser beam emitting unit 33 and the long axis direction of the flat laser beam L form an angle α in a range larger than 45 ° and smaller than 90 °. In this case, it is possible to prevent the shape of the recess 51 from extending in the moving direction of the work W and the laser beam emitting portion 33. On the other hand, as shown in FIG. 3, when the moving direction of the work W and the laser beam emitting portion 33 and the long axis direction of the flat laser beam L form an angle of 90 °, the shape of the recess 51 is the work W. And, it is possible to most efficiently suppress the extension in the moving direction of the laser beam emitting unit 33.

FIG. 11 is a graph schematically showing a modified example of the change in the laser output of the laser beam shown in FIG. With reference to FIG. 11, in this modification, the flat laser beam L is continuously irradiated toward the work W in the irradiation section Sa. Even in this case, it is possible to form the recess 51 having a desired shape having an aspect ratio close to 1 in the work W while shortening the processing time of the work W.

FIG. 12 is a diagram showing a modified example of the form of irradiation of the flat laser beam toward the work. With reference to FIG. 12, in this modification, the laser beam machine 10 has a plurality of laser heads 31 (laser light emitting units 33). The plurality of laser heads 31 (laser light emitting portions 33) are arranged at intervals from each other in the axial direction of the central axis 110 of the work W.

In such a configuration, the work W and the plurality of work Ws are emitted by the moving mechanism unit 21 while emitting the flat laser light L from the plurality of laser light emitting units 33 so that the irradiation section Sa and the stop section Sb are alternately executed. The laser beam emitting unit 33 of the above is relatively spirally moved around the central axis 110 of the work W. As a result, a plurality of recesses 51 can be formed in the work W in a shorter time.

Summarizing the configuration of the work processing method according to the present embodiment described above, the work processing method includes an irradiation section Sa that continuously or pulsedly irradiates the flat laser beam L toward the work W, and the work W. A step of emitting the flat laser light L from the laser light emitting unit 33 is provided so as to alternately execute the stop section Sb for stopping the irradiation of the flat laser light L. When the flat laser beam L is cut by a plane 180 orthogonal to the optical axis 120, the flat laser beam L is orthogonal to the minor axis direction and the major axis direction having a length larger than the length in the minor axis direction. Has a flat cross section including. The work processing method is as follows: the moving direction of the work W and the laser light emitting unit 33 and the flat shape when viewed in the axial direction of the optical axis 120 of the flat laser light L emitted from the laser light emitting unit 33 toward the work W. When the angle formed by the major axis direction of the laser beam L is α, and the angle formed by the moving direction of the work W and the laser beam emitting unit 33 and the minor axis direction of the flat laser beam L is β (α + β). = 90 °), the angle α is larger than the angle β, and the region J on the work W where the flat laser beam L is irradiated in each irradiation section Sa between the irradiation sections Sa executed a plurality of times. Further provided is a step of relatively moving the work W and the laser light emitting unit 33 while the irradiation section Sa and the stop section Sb are alternately executed by the laser light emitting unit 33 so that they do not overlap each other.

According to the work processing method and the laser processing machine 10 according to the embodiment of the present invention configured as described above, a plurality of recesses 51 having a desired shape are processed in the work W while shortening the processing time of the work W. can do.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The present invention applies to a method of machining a workpiece using laser machining.

10 Laser processing machine, 21 moving mechanism part, 21A first moving mechanism part, 21B second moving mechanism part, 22 main body part, 23 arm part, 24 chuck, 31 laser head, 32 head main body, 33 laser light emitting part, 34 1st optical component, 35 2nd optical component, 36 3rd optical component, 41 laser oscillator, 42 optical fiber, 51 recess, 110 central axis, 120 optical axis, 180 plane, G irradiation area, L flat laser beam, J Area, Sa irradiation section, Sb stop section, W work.

Claims (6)

From the laser beam emitting unit, the irradiation section in which the flat laser light is continuously or pulsed toward the work and the stop section in which the irradiation of the flat laser light on the work is stopped are alternately executed. The step of emitting the flat laser beam is provided.
When the flat laser beam is cut by a plane orthogonal to the optical axis, the flat laser beam is orthogonal to the minor axis direction and the major axis direction having a length larger than the length in the minor axis direction. Has a flat cross section, including
When viewed in the optical axis direction of the flat laser light emitted from the laser light emitting portion toward the work, the angle formed by the moving direction of the work and the laser light emitting portion and the long axis direction is α. When the angle formed by the moving direction of the work and the laser beam emitting portion and the minor axis direction is β (α + β = 90 °), the angle α is larger than the angle β and more than 90 °. The laser beam is such that the regions on the work to which the flat laser beam is irradiated in each irradiation section do not overlap each other between the irradiation sections executed a plurality of times. A step of relatively moving the work and the laser beam emitting section while the irradiation section and the stop section are alternately executed by the emitting section is provided .
The work has a cylindrical shape and has a cylindrical shape.
At the step of emitting the flat laser light, the flat laser light is emitted from the laser light emitting portion toward the peripheral surface of the work.
During the step of relatively moving the work, the work and the laser beam emitting portion are relatively moved in the axial direction of the work, and at the same time, the laser light is relatively moved in the circumferential direction of the work. A work processing method in which the emitting portion is spirally scanned with respect to the work. The work processing method according to claim 1 , wherein the flat laser beam has an oval cross section. The work processing method according to claim 1 or 2 , wherein the work and the laser beam emitting portion are relatively moved at a constant speed during the relative movement step. The work processing method according to any one of claims 1 to 3 , wherein when the step of emitting the flat laser light is performed, the flat laser light is pulsed toward the work in the irradiation section. At the step of emitting the flat laser light, the flat laser light is emitted toward the peripheral surface of the work from a plurality of laser light emitting portions arranged at intervals in the axial direction of the work. , The work processing method according to any one of claims 1 to 4 . Equipped with optical components that convert the laser beam into flat laser beam,
When the flat laser beam is cut by a plane orthogonal to the optical axis, the flat laser beam is orthogonal to the minor axis direction and the major axis direction having a length larger than the length in the minor axis direction. Has a flat cross section, including
The flat laser so as to alternately execute an irradiation section in which the flat laser light is continuously or pulsed toward the work and a stop section in which the irradiation of the flat laser light to the work is stopped. A laser beam emitting part that emits light and
When viewed in the optical axis direction of the flat laser light emitted from the laser light emitting portion toward the work, the angle formed by the moving direction of the work and the laser light emitting portion and the long axis direction is α. When the angle formed by the moving direction of the work and the laser beam emitting portion and the minor axis direction is β (α + β = 90 °), the angle α is larger than the angle β and more than 90 °. The laser beam is such that the regions on the work to which the flat laser beam is irradiated in each irradiation section do not overlap each other between the irradiation sections executed a plurality of times. A moving mechanism unit for relatively moving the work and the laser light emitting unit while the irradiation section and the stop section are alternately executed by the emission unit is provided .
When the work has a cylindrical shape, the laser light emitting portion emits the flat laser light toward the peripheral surface of the work.
The moving mechanism unit moves the work and the laser light emitting unit relatively in the axial direction of the work, and at the same time, moves the work and the laser light emitting unit relatively in the circumferential direction of the work, thereby causing the laser light emitting unit to move. A laser processing machine that scans the workpiece in a spiral shape .

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