Calibrating device for laser scale and calibrating method

The invention discloses a calibrating device for a laser scale and a calibrating method. The calibrating device comprises a cross beam, a sliding rail, a sliding block, an adjusting laser head support, a laser head, a compressed air hose, a heat-resisting pipe and a dividing rule. The dividing rule is mounted onto the front side surface of the cross beam by means of a first chute. The laser head is fixedly arranged in the adjusting laser head support and mounted at the upper portion of the sliding block. The calibrating device is installed to a cutting trolley by means of a support frame. The calibrating method comprises following steps: installing the calibrating device; determining cutting operation and setting the scale based on the planned scale and steel grade shrinking percentage; cutting casting blank and calibrating in order to observe whether a laser ray falls down between a scale baffle plate and the end portion of the casting blank; making an adjustment to deviation of casting blank; determining that the overall laser ray just falls down between the scale baffle plate and the end portion of the casting blank and cutting the scale; cutting the casting blank. The calibrating device for the laser scale and the calibrating method have following advantages: prior to cutting of the casting blank, problems of the casting blank including long or short length and oblique cutting are timely found out in order to ensure the scale of the casting blank is accurate without inclination; quality is controllable and cost is decreased; and the calibrating device is simple in structure, convenient in usage and accurate in calibration of the scale.