A datum correction method for 3D laser cutting plate

Abstract

The invention discloses a reference calibration method for a three-dimensional laser cutting plate, comprising the steps of: making at least three marks on the plate to be laser-cut, and obtaining the three-dimensional measurement of the plate to be laser-cut by a three-dimensional measuring tool that can identify the marks. Data: Combine the three-dimensional data with the theoretical numerical simulation of the plate to be cut by laser cutting, select 3 described marks that are not on the same straight line in the fitted data as reference points, and import the reference points into laser cutting Programming software; read the actual coordinates of the reference point, and input it into the laser cutting programming software for correction to generate a laser cutting program. Compared with finding the center of the circle in the existing hole position or finding the point on the shape, the method can find the reference point more efficiently and accurately, and can relatively accurately perform coordinate correction in the program to reduce the deviation and improve the cutting precision.

Description

technical field [0001] The invention relates to a three-dimensional laser cutting technology, in particular to a benchmark correction method for a three-dimensional laser cutting plate. Background technique [0002] Three-dimensional laser cutting technology is widely used in the production of automobile panels, and is mainly used to replace trimming and punching molds to cut the edge lines and holes of plate parts. At present, the three-dimensional laser cutting data is to directly use the product digital model as the cutting data, supplemented by the plate sensor with the laser head and the compensation function of the machine to laser cut the plate. The process is as follows: [0003] 1. Make a radium cutting bracket that conforms to the cut plate (usually cut with waste radium or welded with angle iron and supplemented with resin symbols), and fix it on the machine tool; [0004] 2. Import the theoretical digital model (including surface, line and hole) of the plate to ...

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Problems solved by technology

[0009] 1. There is a certain amount of deviation between the actual plate hole position and the theoretical digital model (the hole position tolerance is usually required to be ±0.5mm, and the maximum tolerance of the relative distance between the two holes is ±1.0mm. If the hole position is out of tolerance, there will be a greater deviation ), as a benchmark, there will be a large deviation in the program, resulting in low cutting accuracy;

[0010] 2. There is a large error in finding a point on the shape of the actual plate, which will cause a large deviation in the program as a benchmark, resulting in low cutting accuracy

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