Teaching system and teaching method for laser machining

A teaching system for laser machining, the teaching system teaching an operation of a robot equipped with a machining head that outputs a laser beam and an operation of the machining head, the teaching system comprising:

• a sensor that detects an intensity of reflected light of the laser beam returning to the machining head from a surface of an object to be machined;
• and
• at least one processor,
• wherein the at least one processor is configured to
• receive inputs of a minimum value and a maximum value of an irradiation angle serving as an angle formed between a normal to the surface of the object to be machined at each of machining points and the laser beam output from the machining head, and coordinates of the machining points, and perform a generation of teaching data that enables laser machining at all the machining points by using the laser beam having the irradiation angle larger than or equal to the minimum value and smaller than the maximum value,
• perform a determination of whether or not intensities of the reflected light detected by the sensor at all the machining points include an intensity exceeding a predetermined threshold value when a controller of the robot executes an operation program including the teaching data by using the laser beam set to an intensity at which the intensity of the reflected light when the irradiation angle is set to the minimum value is smaller than or equal to a permissible value,
• in response to determining that the reflected light having the intensity exceeding the threshold value exists, perform an adjustment to increase the minimum value at a corresponding machining point by a predetermined increment, and
• repeat the generation of the teaching data using a most-recently adjusted minimum value, the determination, and the adjustment of the minimum value until determining that the reflected light having the intensity exceeding the threshold value does not exist.