Method for detecting precision of five-spindle machining center of double-rotary table structure

Abstract

A method for detecting the precision of a five-spindle machining center of a double-rotary table structure comprises the following steps: a movement curve of a five-spindle linked machine tool is designed, and a machine tool theoretical movement curve equation is obtained through the movement curve of the machine tool; a detection instrument is installed, the machine tool theoretical movement curve equation is converted into codes for driving the machine tool to move, the machine tool is controlled to operate, and the length change data of a ball bar is acquired during the movement process of the machine tool; an error model between the length change data of the ball bar and the error of the machine tool is obtained; according to the sampling data and the error model, twenty errors of the five-spindle machining center of the double-rotary table structure are calculated; and the assembly of the parts of the machine tool is adjusted through the twenty errors. After the method is adopted, the instrument is simple to install, debug and operate, the measurement time is shorter, devices are simple to use, and the detection cost is lowered.

Description

technical field [0001] The invention relates to a detection method for the precision of a five-axis machining center, in particular to a detection method for the precision of a five-axis machining center with a double turntable structure. Background technique [0002] The five-axis machining center has a huge efficiency advantage in the processing of complex surfaces, and is widely used in the production and processing of precision molds and precision parts in the aerospace industry. Geometric accuracy is an important performance index of high-precision machine tools, especially multi-axis machining centers. From the factory to the delivery of a five-axis machining center to the user, it often needs to go through multiple precision inspections and adjustments before it can pass the acceptance and be used in production. According to relevant testing standards, using traditional testing methods, it is necessary to use a variety of tools such as linear scales, level gauges, in...

AI Technical Summary

Problems solved by technology

[0008] (5) Dong-Mok Lee and others proposed a method of error detection using a ballbar, which requires multiple paths and multiple positions for clamping. It is aimed at a five-axis machining center with a rotating head, and the efficiency is relatively high. Low (see Dong-Mok Lee et al., Identification and Measurement of Geometric Errors for a Five-axis Machine Tool with a Tilting Head using a Double Ball-bar, INTERNATIONAL JOURNAL OF PRECISION ENGINEERING ANDMANUFACTURING 2011, 12(2):337-343)

[0013] The detection methods proposed in documents (3), (4) and (5) all require multiple measurements on multiple measurement paths, and the instrument must be recalibrated when the measurement path changes, resulting in longer measurement time

[0014] Literature (6) only proposed a four-axis linkage detection method for 8 geometric errors, and did not include all the errors of the rotation axis of the five-axis machining center

Images