A Method of Finding Feature Points of Irregular Shaped 3D Parts

Abstract

The invention discloses a searching method for feature points of an irregular-shape three-dimensional workpiece. The searching method comprises the following steps that the workpiece is arranged in the mode that the diameter face of a round hole in the workpiece is horizontal; a first starting point B is found on the diameter face of the round hole; coordinates of a first X-axis stop point B1 and coordinates of a second X-axis stop point B2 are obtained; coordinates of the X-axis central point B3 of the first X-axis stop point B1 and the second X-axis stop point B2 are calculated; a second starting point A is found on the diameter face of the round hole, coordinates of a first Y-axis stop point A1 and coordinates of a second Y-axis stop point A2 are obtained; coordinates of the Y-axis central point A3 of the first Y-axis stop point A1 and the second Y-axis stop point A2 are calculated; coordinates of the circle center C are determined; the radius r of the round hole is measured through the circle center C, and two quadrantal points N and P are found; coordinate transformation is carried out based on the found circle center C and the found quadrantal points N and P. By means of the searching method, feature points can be quickly found, and a base is provided for machining the workpiece.

Description

technical field [0001] The invention relates to a laser cutting machine or a robot for cutting three-dimensional parts, and specifically designs a method for finding feature points of irregularly shaped three-dimensional parts. Background technique [0002] For the cutting processing of some irregular three-dimensional parts, special fixtures are generally used for cutting on the machine tool. Since the fixtures are specially made, the manufacturing cost will undoubtedly increase for small batch products. Therefore, three-dimensional laser is usually used now. cutting machine or robot for processing. However, the use of three-dimensional laser cutting machines or robots requires the preparation of processing programs. As we all know, the actual coordinate system of the workpiece is required to correspond to the coordinate system of the machine tool when compiling the processing program, which requires finding the feature points of the workpiece as the link between the coord...

AI Technical Summary

Problems solved by technology

For those three-dimensional parts with relatively regular shapes, it is easy to find three or more feature points. However, it is not easy to find the feature points for irregular three-dimensional parts, making it difficult to accurately locate the parts in the machine tool coordinate system. Next, generate a laser cutting program that can be used directly

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