Method for locating the actual machining point using photosensitive elements in laser additive manufacturing

Abstract

The invention belongs to the technical field related to additive manufacturing, and discloses a method for using photosensitive elements to locate actual processing points in laser additive manufacturing. The method includes the following steps: S1 establishes an initial tool coordinate system, the origin is the center of the end of the manipulator, and the direction of the coordinate axis is the same as the direction of the coordinate axis of the manipulator; determining the coordinates of the laser focus in the tool coordinate system; S2 adjusting the manipulator along the Z-axis direction position, so that the laser aperture covers the diameter of the wire to be processed. At this time, the displacement of the manipulator in the Z-axis direction is the defocusing amount of the laser, and the center of the aperture is the actual processing point; S3 takes the center of the aperture as the origin of the tool coordinate system , the direction of each coordinate axis remains unchanged, so as to update the tool coordinate system. The present invention solves the problems that the default tool coordinate system and the actual processing coordinate system in laser additive manufacturing, as well as the actual processing point and the origin of the tool coordinate system are not uniform, the processing accuracy is low, and the error is large.

Description

technical field [0001] The invention belongs to the technical field related to additive manufacturing, and more specifically relates to a method for using photosensitive elements to locate actual processing points in laser additive manufacturing. Background technique [0002] After years of development, additive manufacturing technology has been continuously updated, and additive manufacturing equipment has emerged in an endless stream, such as layered solid manufacturing (LOM), laser selective sintering (SLS), laser selective melting (SLM), fused deposition (FDM), photocuring ( SLA) etc. The above-mentioned additive manufacturing equipment adopts the principle of discrete stacking, that is, the three-dimensional solid model is first reduced to a two-dimensional plane, one-dimensional point lines (commonly known as slices), and codes are generated to guide the equipment to generate three-dimensional points-by-line-by-surface entity. Based on this forming principle, additiv...

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a method of using photosensitive elements to locate the actual processing point in laser additive manufacturing, which solves the default tool coordinate system and actual processing coordinate system in laser additive manufacturing. And the actual processing point is not consistent with the origin of the tool coordinate system, the processing accuracy is low, and the error is large

Images