Dynamic precision detection method under complex motion state of five-axis machine tool based on double-ball-bar

Abstract

The invention discloses a dynamic precision detection method under a complex motion state of a five-axis machine tool based on a double-ball-bar. The method comprises the following steps of step S1, determining the motion trajectory of a tool tip point; determining a tool attitude change process and planning the tool attitude; and step S3, respectively using high and low feed speeds to measure, and respectively calculating positive and negative peak values, a range, a standard deviation and an absolute average error of a detection result under two feed speeds as evaluation indexes. The dynamicprecision detection method provided by the invention comprises a richer motion state and a motion mode, and helps to detect and evaluate the dynamic precision of a five-axis numerical control machinetool more quickly, accurately and comprehensively; the parts affected by dynamic errors in tool tip point offset are separated by means of differential measurement, so that the impact of the dynamicperformance can be extracted, and the influence of geometric errors as miscellaneous errors in the dynamic performance evaluation can be reduced.

Description

technical field [0001] The invention belongs to the technical field of five-axis numerical control machining, and in particular relates to a ballbar-based dynamic precision detection method of a five-axis machine tool in a complex motion state. Background technique [0002] CNC machine tools are the foundation of modern manufacturing, and the precision of CNC machine tools will directly affect the precision of processed products. Five-axis CNC machine tools, as the name suggests, add two rotating axes to the traditional three-axis machine tools, so that they can process complex curved surfaces, and are widely used in aircraft parts, impellers and propellers, etc. The processing has an important influence in aerospace, precision instruments and other fields. For five-axis CNC machine tools, compared with other error types, the dynamic error caused by the dynamic performance defect of the servo system is the most important factor affecting the machining accuracy in the proces...

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Problems solved by technology

The above detection scheme has the advantages of simple detection process and short detection time, but there are some defects: firstly, the motion mode of the machine tool in this detection scheme is too single, and it is difficult to fully reflect the dynamic performance of the machine tool under the actual processing state; secondly, the ballbar The detection results are jointly affected by several types of errors such as geometric errors, thermal deformation errors, and dynamic errors, and it is difficult to detect and analyze the impact of dynamic errors alone; in addition, only the difference between the maximum value and the minimum value is used as the evaluation index of the dynamic performance of the machine tool , the evaluation index is relatively single and cannot fully reflect the dynamic characteristics of the machine tool. Therefore, it is necessary to improve the existing detection scheme

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