Rectangular workpiece position and angle measurement method

Abstract

The invention discloses a rectangular workpiece position and angle measurement method, and the method comprises the steps: 1), enabling a two-dimensional shape measurement sensor to make plane movement in an X-axis or Y-axis direction in a cutting range along with a laser cutting head, enabling the light of a sensor to vertically irradiate an edge part of a steel plate in a downward manner, enabling the light to form an inclined angle theta with the X-axis direction, and obtaining the contour of the edge of the steel plate; 2), obtaining the left and right edge position values of a rectangular piece material through the first measurement; 3), carrying out the translational scanning measurement of the long side of the rectangular piece material, carrying out the sampling of the position of the long edge of the rectangular piece material, and recording the coordinate position of a machine tool; 4), employing a long edge data ample and a two-point straight line method or a least square method for the fitting of a straight line, and calculating the deflection angle of the long side of the rectangular piece material and the X-axis; 5), comparing a left and right edge value and a theoretical left and right edge value, and deducing the X-axis and Y-axis offsets of the rectangular piece material; 6), enabling the obtained deflection angle and the X-axis and Y-axis offsets to be transmitted to a numerical control system for the compensation of a workpiece coordinate system; 7), enabling the numerical control system to start to laser cutting through employing the workpiece coordinate system after compensation.

Description

technical field [0001] The invention belongs to the field of industrial measurement, and in particular relates to a method for measuring the position and angle of a rectangular workpiece, which is suitable for non-contact measurement of the position and angle of a large-sized rectangular workpiece. Background technique [0002] In the field of machine tool cutting, when laser cutting large-sized thin steel plates, the workpiece placed on the cutting platform must be positioned so that the workpiece is in the correct position relative to the machine tool and the laser cutting head, especially the edge of the workpiece. When it is used as the edge of the finished part, the positioning accuracy of the workpiece is required to be high, otherwise it will lead to dimensional errors of the cut part. [0003] The traditional method of workpiece positioning is to use mechanical fixtures to clamp the workpiece, and adjust it with the dial indicator and the marking method to make the p...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the measurement accuracy is easily disturbed by lighting and other conditions, and the installation conditions of the camera and light source are required. The system structure is more complicated and the cost is higher.

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