Patent ID: 9463529
Filing Date: 2016-10-11
CPC Classification: B23K

Claim Text:
1. A laser machining apparatus comprising: a transmission fiber that transmits laser light emitted from a laser oscillator through the fiber; a machining head that emits the laser light, which is sent from the transmission fiber, vertically to a main surface of a machining object and sends reflected light, which is reflected coaxially with the laser light by the machining object, to the transmission fiber; a reflected-light-intensity detecting unit that detects a reflected light intensity of the reflected light sent from the transmission fiber; and a control device that controls the laser oscillator and the machining head, wherein the control device includes a determining unit that, at a time when laser machining is started, determines whether the machining object corresponds to a machining condition in laser machining or not on a basis of the reflected light intensity, wherein the machining condition is read from a machining program that includes a machining position in a product region in the machining object and the machining condition, the determining unit compares a measurement time measured from when the piercing is started to when the reflected light intensity decreases to a predetermined value with a first specified range relating to a measurement time stored in advance, and determines whether the machining object has a thickness corresponding to the machining condition on a basis of a comparison result, and in response to determining that the machining object has a thickness different from a thickness corresponding to the machining condition, the determining unit causes a determination result output unit to output an abnormal determination result relating to thickness.