Abstract
Multi-axis Laser Engraving Machine Tools (LEMT) are widely used in precision processing of parts with complex surface. The accuracy of kinematic model and parameter measurement are the key factors determining the processing quality of LEMT. In this paper, a kinematic model of multi-axis LEMT was established based on Homogeneous Transformation Matrix (HTM). Two types of unknown parameters, linkage parameters and positioning parameters, were measured in the presented model. Taking advantage of the characteristics of laser processing, this paper proposed a rapid measurement method of linkage parameters by combining the machine tool motion with the laser marking action. For positioning parameters, this study proposed a non-contact measurement method based on structured light scanner, which can obtain the translation values and the rotation values from the Workpiece Coordinate System (WCS) to the Basic Coordinate System (BCS) simultaneously. After the measurement of two kinds of parameters of a multi-axis LEMT was completed, the processing of a spatial curve was performed and the average contour error was controlled at 15.1 μm, which is sufficient to meet the project requirements.
Highlights
In recent years, laser engraving has become an important technology of microstructure manufacturing and multi-axis laser engraving machine tools (LEMT) have attracted increasing interest as a result [1]
In the process of linkage parameter measurement, this paper proposed a rapid method by combining the machine tool motion with the laser marking action, which can improve the efficiency of measurement
This paper proposes a positioning parameter measurement method by combining the motion of the machine tool with the position of the object measured by structured light scanner
Summary
Laser engraving has become an important technology of microstructure manufacturing and multi-axis laser engraving machine tools (LEMT) have attracted increasing interest as a result [1]. In addition to the establishment of the kinematic model of the multi-axis machine tool, two types of parameters need to be measured to ensure the accuracy of the model: linkage parameters and positioning parameters. The positioning parameters are called the workpiece origin localization, which represents the position relationship between programming coordinate system of the workpiece and basic coordinate system of machine tool after the workpiece is clamped [14] These parameters need to be measured one time after the machine tool is assembled
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