Point location accuracy evaluation method for gantry drilling machine tool

Abstract

The invention provides a point location accuracy evaluation method for a gantry drilling machine tool. The method comprises the steps that 1, a theoretical machining point of a tool is constructed, position coordinates NPi=[xi,yi,zi] of the theoretical machining point and a unit cutter-axis vector Vi=[Ii, Ji and Ki]T of a cutter located at the position are obtained; 2, three non-collinear points are selected on a first rotating shaft as mark points, the machine tool is adjusted to the initial state and a laser tracker is used for measuring coordinates of the mark points at the moment; then, an axial equation of the first rotating shaft and an axial equation of a second rotating shaft are obtained, and initial position coordinates TCP0 of a cutter point of the cutter are worked out; 3, the machine tool is started to work, the laser tracker is used for measuring coordinates of the mark points on the first rotating shaft when the cutter moves the theoretical machining points; 4, actual machining position coordinates of the cutter point of the cutter are worked out, and a difference delta Pi between the actual machining position coordinates and the theoretical machining position coordinates of the cuter point and a comprehensive error delta Pi are worked out. The measuring and calculation method is simple and rapid, and the cost is saved.

Description

technical field [0001] The invention relates to the field of aviation digital manufacturing, in particular to a point accuracy evaluation method of a gantry hole making machine tool. Background technique [0002] CNC machine tools are very important equipment in the current aviation digital manufacturing. The existing processing machine tools basically use the method of tool setting to establish the machining coordinate system of the workpiece, and the evaluation of the machining accuracy adopts the method of measuring the processed workpiece after machining. In order to reflect the machining accuracy of the machine tool itself, however, in the aviation digital manufacturing, for the hole making machine tool, the processed object is a complex special-shaped piece, which has been installed and fixed in multiple processes in the early stage, and the processed object occurs The size of the deformation cannot be estimated in advance. If the method of tool setting is used, the ma...

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Problems solved by technology

[0002] CNC machine tools are very important equipment in the current aviation digital manufacturing. The existing processing machine tools basically use the tool setting method to establish the machining coordinate system of the workpiece, and the evaluation of the machining accuracy is carried out by measuring the processed workpiece after machining. In order to reflect the processing accuracy of the machine tool itself, however, in the aviation digital manufacturing, for the hole making machine tool, the processed object is a complex special-shaped piece, which has been installed and fixed in multiple processes in the early stage, and the processed object occurs The size of the deformation cannot be estimated in advance. If the method of tool setting is used, the machining accuracy is difficult to guarantee; for manufactured parts, the arrangement of holes processed on the manufactured parts is usually irregular, and it is difficult to directly measure the hole position and hole position of the workpiece in practice. The accuracy of the machine tool is evaluated in the direction of the machine tool, and because the processed object is huge, the manufacturing cost is relatively high, the operation of the simulation part measurement is relatively cumbersome, and it is difficult to analyze the influencing factors of the machine tool accuracy when the workpiece is re-measured after processing.

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