Electric heating – Metal heating – By arc
Patent
1987-07-02
1989-01-03
Albritton, C. L.
Electric heating
Metal heating
By arc
21912164, 21912172, 21912185, B23K 2608
Patent
active
047958782
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to scanners and, more specifically, to scanners for industrial laser machines.
BACKGROUND ART
Modern machine building industry demands that machine components are made more durable and resistant to wear. At present, one of the most promising methods for hardening work-pieces to make them more resistant to wear is laser heat treatment of workpiece surfaces. Scanning systems employed for such purposes in industrial lasers are the basic devices controlling the laser beam in order to ensure high quality and efficiency of laser treatment.
Known in the art is a scanner for industrial lasers (cf., French Patent Application No. 8,509,169), comprising a housing accomodating a movable scanning member, a means for inducing mechanical oscillations of the scanning member, which is connected with the housing, and at least two collision pairs, each such pair having two components secured so that they can interact with each other during displacements of the scanning member, one component being placed on the scanning member and the other in the housing.
However, this scanner is deficient in that, in order to reduce the effect of parameter fluctuations of the means for inducing mechanical oscillations and the scanning member on the operational conditions of the scanner, the speed of scanning is deliberately brought down. If the scanning speed is increased, the collision mode of operation can be upset and the scanner starts to operate in a collision-free mode at a low scanning speed and amplitude. In other words, the operation of the scanner is totally disturbed.
Besides, the deliberate reduction of the scanning speed in this scanner results in a lower collision speed of components of collision pairs. This leads to deviation from the desired optimal (sawtooth) scanning law and deterioration of the scanning accuracy.
DISCLOSURE OF THE INVENTION
It is an object of this invention to provide a scanner for industrial laser machines, which is equipped with such additional units as to increase the speed of collisions in collision pairs without increasing the power of the means for inducing mechanical oscillations of the scanning element, and also to raise the accuracy of scanning.
This is achieved in that a scanner for industrial laser machines, comprising a housing accomodating a movable scanning element, a means for inducing mechanical oscillations of the scanning element, which is mechanically secured to the housing, at least two collision pairs, each pair having two components secured so that they can interact with each other during the movement of the scanning element, one component being secured on the scanning element and the other in the housing, according to the invention, additionally comprises a measuring transducer which responds to mechanical oscillations of the scanning element, a phase shift unit whose input is connected to the measuring transducer, a saturation unit whose input is connected to an output of the phase shift unit, and a power amplifier whose input is connected to the saturation unit and whose output is connected to the means for inducing mechanical oscillations of the scanning member.
Advisably, the scanner for industrial laser machines should additionally comprise a frequency meter connected to the output of the phase shift unit and a saturation level control unit coupled to the frequency meter, while the saturation unit should feature at least two control inputs connected to respective outputs of the saturation level control unit.
Desirably, in the scanner for industrial laser machines, the saturation level control unit should comprise a division unit whose one input is the input of the saturation level control unit, while the other input thereof is connected to a constant voltage source, inverting and noninverting direct-coupled amplifiers, the input of each direct-coupled amplifier being connected to an output of the division unit, while the output of each such direct-coupled amplifier is the respective output of the saturation level control unit.
Reaso
REFERENCES:
patent: 3225206 (1965-12-01), Strong et al.
patent: 4139258 (1979-02-01), Oharek
patent: 4163600 (1979-08-01), Russell
patent: 4429210 (1984-01-01), Sudor et al.
Babitsky Vladimir I.
Gerts Mikhail E.
Ivanov Jury A.
Maiorov Vladimir S.
Makarov Nikolai S.
Albritton C. L.
Institute Mashinovedenia im.A.A. Blagonravova an SSSR
Nauchno-Issledovatelsky Tsentr Po Tekhnologicheskim Lazeram an S
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