The five-axis linkage accuracy of a CNC machine tool refers to the position that the machine tool can reach when the five coordinate axes move simultaneously by adding two rotating coordinate axes, AC or BC, to the three axes of linear coordinates X, Y, and Z. A comprehensive reflection of indicators such as precision and contour accuracy. Here are the specific instructions:
Positioning accuracy
– Positioning accuracy: refers to the positional accuracy that can be achieved by each coordinate axis of the machine tool under the control of the CNC device. For example, when a five-axis linkage machining center positions a certain point, the deviation between the actual. The position and target position must be within the specified range.
– Repeated positioning accuracy: This is the consistency of positioning results when the coordinate axis is positioned at the same position several times under the same conditions. The smaller the value, the more accurate the repeated positioning and the higher the processing stability and consistency. .
Contour accuracy
– Straightness: It is used to measure the degree of conformity between the actual movement path of the machine tool and the ideal straight line during linear interpolation movement. It reflects the precision of the machine tool during linear processing, for example when processing a linear shaft. parts, the straightness of the axis can be guaranteed.
– Roundness: refers to the proximity of the actual circle processed by the machine tool to the ideal circle when performing arc interpolation or processing circular contours. For example, when processing the bladed disc of an aircraft engine blade, it is necessary to ensure that the circles are on. blisks are round.
– Verticality and parallelism: it mainly evaluates the accuracy of the mutual position between the different coordinate axes and movement directions of the machine tool. Verticality refers to the degree to which the two coordinate axes or directions of movement are perpendicular to each other, and parallelism refers to the degree. to which the two coordinate axes or directions of movement are parallel to each other. For example, when processing a mold, it is necessary to guarantee the verticality and parallelism of each part of the mold.
Dynamic precision
– Speed stability: refers to the smoothness of the moving speed of each coordinate axis of the machine tool at different feed speeds. Only with small speed fluctuations can consistency in the quality of the processed surface be ensured.
– Acceleration performance: reflects the responsiveness and precision of each coordinate axis of the machine tool during acceleration and deceleration. Good acceleration performance can improve processing efficiency and accuracy. For example, when milling at high speed, the tool movement state can be fast and accurate. adjusted.
Link accuracy
– Interpolation accuracy: refers to how close the actual motion path is to the theoretical interpolation path when the machine tool performs multi-axis linkage interpolation operations. Only high interpolation accuracy can guarantee the accuracy of processing complex curves and surfaces.
– Timing accuracy: refers to the synchronization performance of movement between coordinate axes in five-axis linkage machining. Good timing accuracy can avoid shape errors and surface quality problems caused by asynchronous movement of coordinate axes.
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