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AssigneeYamazaki Mazak Corporation
InventorsTsunehiko Yamazaki, Naoomi Miyagawa, Toshihiko Inoue, Toshihiko Asari, Masaaru Matsumura
Estimating the term…
In hardening with laser beam by irradiating laser beam. 29 on a workpiece 27, oscillating the laser beam so as to heat a workpiece with a hardening width W1, laser beam output in both end portions (times (1), (5), (6), (10) of FIG. 4, for instance) of amplitude of the laser beam is made lower than one of a center portion (times (3), (4), (7), (8) of FIG. 4, for instance) of the amplitude. Relative moving velocity of the laser beam with respect to workpiece is decreased, and the quantity of giving energy of the laser beam in both end portions of the amplitude where the density of giving energy of laser beam is high is decreased so as to equalize quantity of aiming energy in the whole hardening cycle. By doing so, a proper hardening action is possible.
Method of controlling hardening with laser beam by irradiating laser beam on a workpiece, comprising:
Method of controlling hardening with laser beam when hardening with laser beam is done by irradiating laser beam on a workpiece, comprising:
Laser beam hardening device, comprising:
Laser beam hardening device, comprising:
Laser beam hardening device, comprising:
Laser beam hardening device, comprising:
Laser beam hardening device, comprising:
Laser beam hardening device, comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Surface hardening: by direct application of electrical or wave energy; by particle radiation
By direct control of the laser beam: energy control of the laser beam
Devices involving relative movement between laser beam and workpiece: scanning systems, i.e. devices involving movement of the laser beam relative…
By using an endless conveyor belt: for moving elongated workpieces longitudinally, e.g. wire or strip material
Term end not estimated
This invention relates to a method of controlling hardening with laser beam and a laser beam hardening device, capable of correctly measuring and controlling temperature of a portion to be hardened.
A method of hardening on a workpiece with a predetermined width by oscillating laser beam in a direction intersecting a feeding direction has been recently proposed. But, it is necessary to correctly detect the temperature of a portion to be hardened and to control the temperature of the portion for proper hardening.
However, such temperature control is not executed in a conventional laser beam hardening device. And, a method of measuring the temperature of the portion to be hardened by detecting the portion to be hardened from the outside by an infrared sensor or the like is also thinkable. But, it is difficult to trail a torch by a sensor, and this method is not practical since the torch for injecting the laser beam takes a complicated action so as to oscillate laser beam in a direction intersecting the feeding direction or to three-dimensionally harden, as mentioned before.
FIG. 1 is a schematic perspective view for showing an important portion of a laser beam hardening device to which the present invention is applied;
FIG. 2 is a block diagram for showing an important portion of a NC unit;
FIG. 3 is a schematic view for showing contents of a laser beam output value memory;
Embodiments of the present invention will now be explained hereinafter, referring to drawings.
FIG. 1 is a schematic perspective view for showing an important portion of a laser beam hardening device to which the present invention is applied, FIG. 2 is a block diagram for showing an important portion of a NC unit, FIG. 3 is a schematic view for showing contents of laser beam output value memory, FIG. 4 is a view for showing a hardening track of laser beam, FIG. 5 is a schematic view for showing contents of each data block in the laser beam output value memory, and FIG. 6(a) is a chart for showing the track of laser beam (hardening cycle), FIG. 6(b) is a chart for showing velocity of laser beam corresponding to (a) with respect to a workpiece, FIG. 6(c) is a chart for showing an example of a laser beam output pattern corresponding to (a), and FIG. 6(d) is a chart for showing the other example of the laser beam output pattern corresponding to (a).
A laser beam hardening device 1 has a laser beam oscillator 2, as shown in FIG. 1, and a saddle 5 is connected with the laser beam oscillator 2 through a duct 3 provided being stretchable. The saddle 5 is provided being free to move and drive in a Y-axis direction which is a horizontal direction, through a guide means (not shown), such as a column, and the saddle 5 is provided with a hardening head 7. Furthermore, the hardening head 7 has an upper reflection barrel 6 fixedly provided at the saddle 5.