JP4554040B2 - Laser gear processing method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a surface heat treatment method, and more particularly to a method and apparatus for heat-treating a surface of a valley-shaped portion having a valley-shaped portion such as a gear using a laser.
[0002]
[Prior art]
In order to increase the strength of the trough-shaped parts such as gears, that is, the tooth groove, it is indispensable to heat-treat the tooth groove surface, but industrially, this heat treatment is performed by methods such as electromagnetic induction heating, carburizing, and nitriding. Is currently underway.
[0003]
However, when the above method such as electromagnetic induction heating is used, the tooth tip portion that does not require heat treatment is excessively heat treated, which is not preferable in terms of strength. Further, in the case of the above-described method such as electromagnetic induction heating, there is a problem that the energy loss is large and the heat treatment distortion increases accordingly.
[0004]
By the way, in recent years, various heat treatment methods using a laser as a heating means have been carried out. As shown in FIG. 10B, in order to perform surface heat treatment of the tooth groove of the gear 2, it is directly above the tooth groove. There is a method in which a laser beam 1 is incident. That is, there is a method in which the laser beam 1 is irradiated such that the optical axis of the laser beam 1 is near the center line of the tooth gap of the gear 2 and the wall surfaces on both sides of the tooth groove are symmetrical about the optical axis. is there.
[0005]
In the case of the example shown in FIG. 10, the distribution of the hardened layer 9 (the hatched portion in FIG. 10B) is thin on the side wall surface of the tooth gap and thick on the bottom surface, and only nonuniform heat treatment can be performed.
[0006]
For this reason, when the hardened layer 9 having an appropriate thickness is formed on the bottom surface of the tooth gap, the hardened layer 9 having a sufficient thickness is not formed on the side wall surface, and the desired mechanical strength is obtained. Part that cannot be achieved occurs.
[0007]
As shown in FIG. 10A, the power density distribution of the laser 1 is a Gaussian distribution having a peak at the center of the optical axis of the laser 1, and the incident angle of the laser 1 is The angle θ2 with respect to the bottom is approximately 90 degrees, whereas the angle θ1 with respect to the sidewall surface is an angle of 90 degrees or less, and the absorption rate with respect to the sidewall surface of the laser 1 is significantly reduced. This is because the difference in absorbed energy is greatly different from each other.
[0008]
As a method for solving this, for example, there is a technique described in JP Akira 61-284519. In the technique described in this publication, as shown in FIG. 11, the laser absorbent 3 is preliminarily applied to the side wall surface and the tooth bottom surface of the tooth gap, so that the portion where the laser absorbent 3 is applied is heated. Since it absorbs more energy than the easy tooth tip portion, it can be uniformly heat-treated.
[0009]
Further, according to the technique described in JP Sho 60-215715, in the laser heat treatment method, as shown in FIG. 12, the laser 1, which is generated from the laser beam generator 40, by the mirror 5 triangular prism Branched into two lasers.
[0010]
Each of the branched lasers 1 is reflected by the total reflection mirror 6, and each of the reflected lasers 1 is collected by the convex lens 7, and then the laser 1 is applied to the side wall surfaces of the teeth 2 facing each other. This is a method in which the gear 2 is irradiated and heat-treated by a laser.
[0011]
Further, according to the technique described in Japanese Patent Application Laid-Open No. 60-9828, as shown in FIG. 13, the rotating wheel 8 is irradiated with the laser 1 and the surface of the rotating wheel 8 is rotated. Depending on whether it is reflected by 8 or passes through this rotating wheel 8, the passage route and time are branched, and the side surface portion of the gear 2 is irradiated with an incident angle alternately via the lens 7 and the mirror body 6. Then, there is a method of heat treatment.
[0012]
[Problems to be solved by the invention]
However, as in the technique described in JP Sho 61-284519 Patent Publication described above, the method of applying the absorbent 3 of laser 1, since the application operation process of the absorbent 3 is increased, the overall heat treatment operation time Increases, which is not preferable for mass production.
[0013]
Also, as in the technology disclosed in JP-A-Sho 60-215715, after branching the laser 1, folding the reflecting mirror 6 a laser 1 which branches, respectively, were condensed by the convex lens 7, the opposite In the case of heat treatment in which the side wall of the tooth to be irradiated is irradiated with the laser 1, it is preferable to heat treat one tooth profile shape. It is very difficult to change.
[0014]
That is, JP In the art Akira 60-215715 JP, when heat-treating the ones spacing and size of the teeth of gear 2 are different, the two reflecting mirrors 6 mutual positional relationship, the two The positional relationship between the convex lenses 7 and the relative positional relationship between the mirror 5, the reflecting mirror 6, the convex lens 7, and the gear 2 must be changed and adjusted, which is very difficult to adjust.
[0015]
Further, as in the technique described in Japanese Patent Application Laid-Open No. 60-9828, in the case of a heat treatment method in which the laser 1 is time-branched by the rotating wheel 8 and is incident on the tooth side wall alternately, as shown in FIG. In addition, the portion A where the laser irradiation from one direction and the laser irradiation from the other direction overlap is reheated by the laser 1 from the other direction after the heat treatment by the laser 1 from one direction, so that the portion A is annealed. Therefore, there arises a problem that a desired cured layer 9 cannot be obtained.
[0016]
For example, as shown in FIG. 15, in the case of a tooth profile having a flat bottom, the softening of the B portion, which is the bottom of the tooth, is permitted in terms of tooth strength.
[0017]
On the other hand, when the tooth bottom is not flat and has a U-shaped tooth shape as shown in FIG. 14, the softening of the tooth bottom A portion is a stress concentration portion. There arises a problem that the strength of the tooth gap is significantly reduced.
[0018]
An object of the present invention is to realize a gear heat treatment method and apparatus using a laser capable of uniformizing the hardened layer on the tooth groove surface of a gear having various shapes and dimensions without complicated adjustment. is there.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
(1) In a gear heat treatment method using a laser, two laser beams generated from a laser beam generating unit are introduced into two laser shaping units of an optical system unit, and the two laser shaping units are respectively connected to a lens. The lens center axis connecting the centers is composed of a plurality of lenses located on the same axis, and the lens center axes are arranged parallel to each other between the two laser shaping parts, and two elliptical laser beams The two laser beams are aligned so that the longitudinal direction of the spot coincides with the circumferential direction of the gear, and the two elliptical beam spots are positioned on the side wall surface between the tooth bottom surfaces of the gear teeth. Shaping at the two laser shaping parts and irradiating the tooth grooves and moving the two elliptical beam spots relative to the axial direction of the gear to heat the gear; The wedge substrate arranged as one of said plurality of lenses in each of the two laser shaping section of the optical system unit, by rotating the wedge substrate, the irradiation position interval of each other of the two beam spots of the elliptical The distance between the irradiation positions of the two elliptical beam spots is adjusted according to the pitch of the gear to be heat-treated.
[0020]
(2) Further, in the gear heat treatment method using a laser, introducing the two laser beams generated from the laser beam generating means into the two laser shaping units of the two optical system units, the two laser shaping units, The lens center axis connecting the lens centers is composed of a plurality of lenses coaxially positioned, and arranged so that the respective lens center axes are parallel between the two laser shaping portions . The two laser beam spots are aligned with the circumferential direction of the gear, and the two elliptical beam spots are positioned on the side wall surface between the tooth bottom surfaces of the gear teeth. The laser beam is shaped by the two laser shaping parts and irradiated to the tooth gap, and the two elliptical beam spots are moved relatively in the axial direction of the gear to heat the gear. Ukoto, a means for adjusting the spacing of the two optical systems unit, by adjusting the spacing of the two optical systems unit drives this means, the distance between the lens center axis of the laser shaping unit By adjusting, the irradiation position interval between the two elliptical beam spots is variable, and the irradiation position interval between the two elliptical beam spots is adjusted in accordance with the pitch of the gear to be heat-treated. .
[0021]
(3) In a gear heat treatment apparatus using a laser, laser beam generating means for generating two laser beams, and two laser beams generated from the laser beam generating means are introduced, and the two laser beams are elliptically shaped. An optical system unit that shapes and irradiates two laser beam spots, a rotary table that rotates the gear with respect to its central axis, and an optical axis of the laser beam emitted from the optical system unit A moving unit that relatively moves in the axial direction; and an adjusting unit that adjusts a distance between the two elliptical beam spots. The optical system section includes a length of the two elliptical laser beam spots. The direction is matched with the circumferential direction of the gear, and the two elliptical beam spots are positioned on the side wall surface with the tooth bottom surface of the tooth gap of the gear in between. Serial has two laser shaping unit that shapes the two laser beams is irradiated to the tooth spaces, the two laser shaping section, respectively, the lens center axis connecting the centers of the lens of a plurality of coaxially positioned The lens includes a lens and is arranged so that the respective lens central axes are parallel between the two laser shaping sections, and the adjusting means includes one of the plurality of lenses in each of the two laser shaping sections of the optical system section. has arranged wedge substrate as one, by rotating the wedge substrate, and the irradiation position interval of each other of the two beam spots of the elliptical is variable, corresponds to the pitch of the gear is a heat treatment of the subject The interval between the irradiation positions of the two elliptical beam spots is adjusted.
[0022]
(4) Further, in a gear heat treatment apparatus using a laser, laser beam generating means for generating two laser beams, and two laser beams generated from the laser beam generating means are introduced, and the two laser beams are elliptical. Two optical system parts that are shaped and irradiated so as to form two shaped laser beam spots, a rotary table that rotates a gear with respect to its central axis, and laser beams emitted from the two optical system parts an optical axis, a moving means for moving in the axial direction of the gear, and an adjustment means to adjust the mutual spacing of the two beam spots of the elliptical, the two optical systems unit, upper Symbol elliptical longitudinal two laser beam spots of the circular to match the circumferential direction of the gear, two beam spots of the elliptical be between the bottom land of the teeth grooves of the gear So as to be positioned on the wall, it has two laser shaping unit that irradiates the tooth to shape the two laser beams, the two laser shaping section, respectively, the lens center axis connecting the centers of the lens A plurality of lenses positioned on the same axis, and arranged so that the respective lens central axes are parallel between the two laser shaping sections; and the adjusting means adjusts the distance between the two optical system sections. And adjusting the distance between the two optical system parts by driving this means, thereby adjusting the distance between the lens central axes of the laser shaping parts and irradiating the two elliptical beam spots with each other. The position interval is variable, and the irradiation position interval between the two elliptical beam spots is adjusted in accordance with the pitch of the gear to be heat-treated.
[0023]
(5) In addition, preferably, in the above (3) or (4), said two laser beams, two laser shaping unit for irradiating shaped to form two laser beam spots of the elliptical shape, respectively And having a cylindrical lens.
(6) Preferably, in the above (5) , each of the two laser shaping units has one cylindrical convex lens as the cylindrical lens.
[0024]
With the two elliptical laser beams, the longitudinal direction of the elliptical laser beam coincides with the circumferential direction of the gear, and the apexes of the power densities of the two laser beams are positioned on the side wall surface with the tooth bottom in between. In this manner, the gear is irradiated from the direction perpendicular to the tooth bottom surface of the gear tooth gap, and the two irradiated beam spots are moved in the axial direction of the gear.
[0025]
As a result, the laser is incident at an incident angle of less than 90 degrees, the apex portion of the power density is irradiated onto the side wall surface having a low energy absorption rate, the laser is incident at an angle of approximately 90 degrees, and the energy absorption rate is high. Since the portion having a low power density is irradiated on the tooth bottom surface, the heat input amount is almost uniform over the entire tooth gap of the gear, and the hardened layer of the tooth gap is also substantially uniform.
[0026]
Further, since the optical axes of the two laser beams are configured to irradiate the gear 2 in a state of being nearly parallel to each other, the means for adjusting the distance between the two laser beams can be realized with a simple configuration. be able to.
[0027]
Therefore, it is possible to realize a gear heat treatment method and apparatus using a laser that can uniformize a hardened layer on the tooth groove surface of a gear having various shapes and sizes without complicated adjustment.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of a laser heat treatment apparatus to which a gear heat treatment method and apparatus using a laser according to an embodiment of the present invention is applied.
[0029]
In FIG. 1, two optical fibers 13 for transmitting a laser 1 from two power sources 11 and a laser oscillator 4 are arranged in a laser heat treatment apparatus to which the present invention is applied.
[0030]
In addition, the laser heat treatment apparatus includes an optical system unit 14. In the optical system unit 14, two convex lenses 16 (described later) arranged with the ends of the two optical fibers 13 as front focus positions are arranged. The laser 1 emitted from the optical fiber 13 is collimated.
[0031]
Further, in the subsequent stage of the convex lens 16 of the optical system unit 14, there is disposed a laser integer form part, the laser 1, the condenser lens of the laser integer form part, FIG around the troughs of the teeth of the gear 2 2 Two elliptical spots 10 having a distribution as shown in FIG.
[0032]
The laser heat treatment apparatus is provided with a drive system 15, the drive system 15 is coupled to the optical system unit 14, the optical science system unit 14 in the axial direction of the gear 2, Ru moved relative to the gear 2.
Further, the laser heat treatment apparatus is provided with a rotary table (not shown) for rotating the gear 2 around the center of the gear 2 as shown in FIG. The rotational positioning is performed so that C is arranged so as to pass through substantially the center point of the tooth groove of the gear 2.
[0033]
Thereby, as shown in FIG. 3, the two laser spots 10 are each irradiated to the tooth | gear side wall.
The controller 12 controls the operation of the drive system 15 and the power supply 11.
[0034]
FIG. 4 shows three configuration examples of the laser shaping unit at the subsequent stage of the convex lens 16 described above. Note that each optical system shown in FIGS. 4A, 4B, and 4C has only one side configuration, but actually has a configuration in which two identical optical systems are arranged side by side.
[0035]
In the example shown in FIG. 4 (A), the laser 1 which has passed through the convex lens 16, cylindrical convex lens 1 7, cylindrical concave lens 1 8, is irradiated to the gear 2 through the condenser lens 7, the spot 10 It becomes.
[0036]
In the case of the example shown in FIG. 4A, when the focal length of the cylindrical concave lens 18 is f ₁ and the focal length of the cylindrical convex lens 17 is f ₂ , the distance D between the cylindrical convex lens 17 and the cylindrical concave lens 18 is D 1. ₁ is arranged at a position of D ₁ = f ₁ + f ₂ .
[0037]
In the example shown in FIG. 4B, the laser 1 that has passed through the convex lens 16 is irradiated onto the gear 2 via the cylindrical convex lens 17, the cylindrical convex lens 17, and the condenser lens 7, and becomes a spot 10.
[0038]
In the example shown in FIG. 4B, when the focal length of the front cylindrical convex lens 17 is f ′ ₁ and the focal length of the rear cylindrical convex lens 17 is f ′ ₂ , the two cylindrical convex lenses 17 are mutually connected. The distance D ₂ is arranged at a position of D ₂ = f ′ ₁ + f ′ ₂ .
[0039]
Further, in the example shown in FIG. 4C, the laser 1 that has passed through the convex lens 16 is irradiated onto the gear 2 via the cylindrical convex lens 17 and the condenser lens 7 and becomes a spot 10.
[0040]
Among the examples shown in FIGS. 4A, 4B, and 4C, the most preferable example is considered to be the example of FIG. 4C in which one cylindrical convex lens 17 is arranged.
This is because, in the case of an optical system in which two cylindrical lenses described above are arranged, it is necessary to secure a space of distance D ₁ or distance D _{2 due to} the device configuration. In order to make the device size compact, the focal length f ₁ , f ₂ (or f ′ ₁ , f ′ ₂ ) needs to be reduced. In this case, there are many adjustment elements for the combination of two cylindrical lenses, and adjustment is very difficult.
However, with the configuration that uses only one cylindrical lens, if the method of integer form an elliptical spot 10, in order to use the cylindrical lenses of long focal adjustment of the cylindrical lens arrangement becomes very simple, the adjustment element This is because it can be reduced.
[0041]
By the way, as shown in FIG. 5, in order to perform the surface heat treatment of the tooth gap of the gear 2 as in the prior art described above, when the laser 1 is incident directly on the tooth groove, the hardened layer 9 (( The distribution of the shaded portion (B) is thin on the side wall surface and thick on the bottom surface, and only non-uniform heat treatment can be performed.
This is because when the hardened layer 9 having an appropriate thickness is formed at the bottom of the tooth gap, the hardened layer 9 having a sufficient thickness is not formed on the side wall surface, and the power density distribution of the incident laser 1 is shown in FIG. 5 (A), it is a Gaussian distribution having a peak at the center of the laser optical axis, and the incident angle of the laser 1 is perpendicular to the tooth bottom, whereas it is 90 degrees on the side wall surface. Since the absorptance with respect to the side wall surface of the laser 1 is remarkably lowered at the following angles, the bottom surface is higher than the side wall surface in the absorptance distribution on the side wall surface and the bottom surface as shown in FIG. This was due to the distribution.
[0042]
On the other hand, in the gear heat treatment method and apparatus using the laser according to the embodiment of the present invention, the power density distribution of the laser 1 output from the optical system unit 14 to the gear 2 is shown in FIG. With respect to the energy absorption rate distribution of the tooth gap, as shown in FIGS. 6A and 6B, the side wall of the tooth is irradiated with the laser 1 having a high power density distribution, and the tooth bottom has a low power density distribution. Since the laser is irradiated, the incident light is made up to compensate for the low absorption rate of the tooth side surface.
As a result, as shown in FIG. 6D, the heat input amount of the entire tooth gap can be made substantially uniform, and this distribution is moved by the moving means in the axial direction of the gear 2 as described above, whereby the tooth A uniform heat treatment can be performed on the surface of the groove.
[0043]
Furthermore, in the above configuration, the incident angle of the laser beam can be changed with respect to the condenser lens 7 by disposing the wedge substrate in front of the laser shaping unit or in front of the condenser lens 7 with respect to the laser heat treatment apparatus. is there.
[0044]
FIG. 7 shows an example in which the wedge substrate 19 is used in front of the condenser lens 7, and the laser shaping unit is an example in which one cylindrical convex lens 17 is used.
[0045]
As shown in FIG. 7, by arranging the wedge substrate 19, the position of the elliptical spot 10 in the gear 2 becomes a position displaced with respect to the central axis Ca of the condenser lens 7.
[0046]
When the wedge substrate 19 is rotated about its axis, the elliptical spot 10 displaced with respect to the central axis Ca of the condenser lens 7 rotates as shown in FIG. 8 as the wedge substrate 19 rotates. Moving.
[0047]
As a result, the positional relationship between the left and right spots 10 is determined by the angle and rotation direction of the wedge substrate 19.
[0048]
Further, the left and right spots 10 are generated when the wedge substrate 19 is rotated in the rotation direction shown in FIG. 8, that is, the right wedge substrate 19 is rotated counterclockwise and the left wedge substrate 19 is rotated clockwise. In this case, the left spot 10 in FIG. 8 continuously moves as 1 → 2 → 3 →... → 7 → 8. Further, the right spot 10 in FIG. 8 continuously moves as 1 ′ → 2 ′ → 3 ′ →... → 7 ′ → 8 ′.
[0049]
Then, if the rotation angle of the right wedge substrate 19 in FIG. 7 is reversely rotated by the same amount as the rotation angle of the left wedge substrate 19, the positional relationship between the left and right spots 10 is relatively arbitrarily changed. Is possible.
[0050]
Thus, the two spots 10, in the presence and the state in the circumferential direction of the gear 2, it is possible to adjust the distance therebetween.
[0051]
Therefore, when the tooth width of the gear 2 to be heat-treated is changed, it can be dealt with by adjusting the rotation amount of the wedge substrate 19 and adjusting the output power of the laser.
[0052]
FIG. 9 is a diagram illustrating another example of adjusting the distance between two spots 10.
The example shown in FIG. 7 is an example in which the distance between the two spots 10 is adjusted by rotating the wedge substrate 19, but the example shown in FIG. 9 is the distance between the two optical system units 14. This is an example in which the distance between the two spots 10 is adjusted by adjusting.
[0053]
9A shows the top surface of the means for adjusting the distance between the two spots 10 by adjusting the distance between the two optical system sections 14, and FIG. 9B shows the above adjustment. A side view of the means is shown.
[0054]
In FIG. 9, by driving the motor 30, the trapezoidal gear rotates, and the left and right sliders 22 move in a direction toward or away from each other. An optical system unit 14 is attached to each slider 22.
[0055]
Therefore, the distance between the two laser spots 10 can be adjusted by adjusting the distance between the two optical system portions 14 by driving the motor 30.
[0056]
As described above, according to an embodiment of the present invention, two elliptical laser beams 1 whose optical axes are parallel to each other are matched with the longitudinal direction of the elliptical laser beam 1 in the circumferential direction of the gear 2. Then, the gear 2 is irradiated from the direction perpendicular to the tooth bottom surface of the tooth gap of the gear 2 so that the peak of each power density of the two laser beams 1 is located on the side wall surface with the tooth bottom surface in between, The two irradiated beam spots 10 are moved in the axial direction of the gear 2.
[0057]
As a result, the laser 1 is incident at an incident angle of less than 90 degrees, the apex portion of the power density is irradiated onto the side wall surface having a low energy absorption rate, and the laser 1 is incident at an angle of approximately 90 degrees to absorb the energy absorption rate. Since a portion having a low power density is irradiated on the tooth bottom having a high tooth width, the heat input amount becomes almost uniform over the entire tooth gap of the gear 2, and the hardened layer of the tooth gap is also made substantially uniform.
[0058]
Further, since the optical axes of the two laser beams 1 are irradiated onto the gear 2 in a state of being parallel to each other, the means for adjusting the distance between the two laser beams 1 is a simple configuration. Can be realized.
[0059]
Therefore, it is possible to realize a gear heat treatment method and apparatus using a laser that can uniformize a hardened layer on the tooth groove surface of a gear having various shapes and sizes without complicated adjustment.
[0060]
As a means for adjusting the distance between the two laser spots 10, in addition to the examples shown in FIGS. 7 and 9, by moving the condenser lens 7 or the convex lens 16 shown in FIG. The distance between the two laser spots 10 can also be adjusted.
[0061]
【The invention's effect】
According to the present invention, a method for heat-treating a gear by a laser capable of uniformizing a hardened layer on a tooth groove surface of a gear having various shapes and dimensions with simple control and adjustment without complicated adjustment. And an apparatus can be realized.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a laser heat treatment apparatus to which a gear heat treatment method and apparatus using a laser according to an embodiment of the present invention is applied.
FIG. 2 is an explanatory diagram of the power density of a laser beam in one embodiment of the present invention.
FIG. 3 is a view for explaining the irradiation position of a laser beam spot on a gear according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a configuration example of a laser shaping unit.
FIG. 5 is a diagram for explaining the laser power density and tooth gap absorption in the prior art for comparison with the present invention.
FIG. 6 is a diagram for explaining a laser power density, an absorption rate of a tooth gap, and a heat input amount to the tooth gap in an embodiment of the present invention.
FIG. 7 is a diagram showing an example of means for adjusting the interval between two laser spots in an embodiment of the present invention.
FIG. 8 is an explanatory diagram when changing the irradiation position of the laser spot in the example of FIG. 7;
FIG. 9 is a diagram showing another example of means for adjusting the interval between two laser spots in an embodiment of the present invention.
FIG. 10 is a diagram showing an example of a heat treatment method for gears using a laser in the prior art.
FIG. 11 is a diagram showing another example of a heat treatment method for gears using a laser in the prior art.
FIG. 12 is a view showing still another example of a heat treatment method for gears by a laser in the prior art.
FIG. 13 is a view showing still another example of a heat treatment method for gears by a laser in the prior art.
FIG. 14 is an explanatory diagram of problems in the prior art.
FIG. 15 is an explanatory diagram of problems in the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Laser 2 Gear 4 Laser oscillator 7 Condensing lens 10 Elliptical laser spot 11 Power supply 12 Controller 13 Optical fiber 14 Optical system part 15 Axial direction drive system 16 Convex lens 17 Cylindrical convex lens 18 Cylindrical concave lens 19 Wedge board | substrate 20 Motor 21 Trapezoid gear 22 Slider

Claims (6)

In the heat treatment method for gears by laser,
Introducing the two laser beams generated from the laser beam generating means into the two laser shaping sections of the optical system section;
The two laser shaping sections are each composed of a plurality of lenses whose lens central axes connecting the centers of the lenses are coaxially arranged, and the respective lens central axes are parallel between the two laser shaping sections. To place in,
The longitudinal direction of the two elliptical laser beam spots coincides with the circumferential direction of the gear, and the two elliptical beam spots are positioned on the side wall surface with the tooth bottom surface of the gear tooth gap in between. The two laser beams are shaped by the two laser shaping sections and irradiated to the tooth groove, and the two elliptical beam spots are moved relatively in the axial direction of the gear to heat the gear. ,
By disposing a wedge substrate as one of the plurality of lenses in each of the two laser shaping portions of the optical system portion and rotating the wedge substrate, the irradiation position interval between the two elliptical beam spots is mutually determined. , And the irradiation position interval between the two elliptical beam spots is adjusted in accordance with the pitch of the gear to be heat-treated. In the heat treatment method for gears by laser,
Introducing two laser beams generated from laser beam generating means into two laser shaping sections of two optical system sections;
The two laser shaping sections are each composed of a plurality of lenses whose lens central axes connecting the centers of the lenses are coaxially arranged, and the respective lens central axes are parallel between the two laser shaping sections. To place in,
The longitudinal direction of the two elliptical laser beam spots coincides with the circumferential direction of the gear, and the two elliptical beam spots are positioned on the side wall surface with the tooth bottom surface of the gear tooth gap in between. The two laser beams are shaped by the two laser shaping sections and irradiated to the tooth groove, and the two elliptical beam spots are moved relatively in the axial direction of the gear to heat the gear. ,
A means for adjusting the distance between the two optical system sections is provided, and the distance between the lens central axes of the laser shaping section is adjusted by driving the means to adjust the distance between the two optical system sections. The irradiation position interval between the two elliptical beam spots is variable, and the irradiation position interval between the two elliptical beam spots is adjusted according to the pitch of the gear to be heat-treated. A heat treatment method for gears using a laser. In the gear heat treatment device by laser,
Laser beam generating means for generating two laser beams;
An optical system unit that introduces two laser beams generated from the laser beam generating unit, shapes the two laser beams so as to form two elliptical laser beam spots, and irradiates them;
A rotary table that rotates the gear about its central axis;
Moving means for relatively moving the optical axis of the laser beam emitted from the optical system unit in the axial direction of the gear;
Adjusting means for adjusting the distance between the two elliptical beam spots;
With
The optical system unit is configured such that the longitudinal direction of the two elliptical laser beam spots coincides with the circumferential direction of the gear, and the two elliptical beam spots are located between the tooth bottom surfaces of the gear teeth. Having two laser shaping parts for shaping the two laser beams and irradiating the tooth gap so as to be located on the wall surface;
Each of the two laser shaping sections includes a plurality of lenses whose lens central axes connecting the centers of the lenses are coaxially arranged, and the respective lens central axes are parallel between the two laser shaping sections. Arranged,
The adjusting means has a wedge substrate disposed as one of the plurality of lenses in each of the two laser shaping portions of the optical system portion, and the two elliptical shapes are obtained by rotating the wedge substrate. The distance between the irradiation positions of the beam spots is variable, and the distance between the irradiation positions of the two elliptical beam spots is adjusted in accordance with the pitch of the gear to be heat-treated. Heat treatment equipment. In the gear heat treatment device by laser,
Laser beam generating means for generating two laser beams;
Two optical systems that introduce two laser beams generated from the laser beam generating means, and shape and irradiate the two laser beams so as to form two elliptical laser beam spots;
A rotary table that rotates the gear about its central axis;
Moving means for relatively moving the optical axes of the laser beams emitted from the two optical system sections in the axial direction of the gear;
And adjustment means to adjust the mutual spacing of the two beam spots of the elliptical shape,
With
The two optical systems section, the longitudinal direction of the two laser beam spots of the upper Ki楕 circular to match the circumferential direction of the gear, two beam spots of the elliptical a bottom land of the teeth grooves of the gear Having two laser shaping parts for shaping the two laser beams and irradiating the tooth gap so as to be located on the side wall surface between them;
Each of the two laser shaping sections includes a plurality of lenses whose lens central axes connecting the centers of the lenses are coaxially arranged, and the respective lens central axes are parallel between the two laser shaping sections. Arranged,
The adjusting means has means for adjusting the distance between the two optical system parts, and by driving the means to adjust the distance between the two optical system parts, the lens central axis of the laser shaping part is adjusted . By adjusting the interval, the irradiation position interval between the two elliptical beam spots is variable, and the irradiation position interval between the two elliptical beam spots is set corresponding to the pitch of the gear to be heat-treated. An apparatus for heat-treating a gear by a laser, characterized by adjusting.   5. The laser gear gear heat treatment apparatus according to claim 3, wherein the two laser beams are shaped and irradiated so as to form two elliptical laser beam spots. 6. Each part has a cylindrical lens, The heat processing apparatus of the gear by the laser characterized by the above-mentioned. In the heat processing apparatus of the gear by the laser according to claim 5,
Each of the two laser shaping sections has one cylindrical convex lens as the cylindrical lens, and a gear heat treatment apparatus using lasers.

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