Online monitoring device for radial rotation accuracy of main shaft

Abstract

An online monitoring device for the radial rotation accuracy of a main shaft is disclosed, wherein a monitoring ring is installed at the radial measuring position of the main shaft; three eddy-current displacement sensors are installed on the monitoring ring; the proximitors of the eddy-current displacement sensors are connected with the terminal board of a data acquisition board card; the data acquisition board card is connected to an industrial computer via a PCI (peripheral component interconnection) slot; when the main shaft is in a rotating state, the eddy-current displacement sensors convert the measured voltage signal to a standard voltage signal via the proximitors; the analog signal is converted to a digital signal via a signal conditioning circuit module and an A/D (analog/digital) conversion module on the data acquisition board card, and then the digital signal enters into the industrial computer; the radial displacement signal of the main shaft is obtained by signal acquisition and analysis software; the roundness error of the main shaft is separated out by applying a three-point error separation technology, thereby obtaining the rotation error of the main shaft; and finally the analysis result of the rotation accuracy of the main shaft is displayed. The online monitoring device for the radial rotation accuracy of a main shaft has the advantages of being high in accuracy and convenient in adjustment.

Description

technical field [0001] The invention belongs to the technical field of online monitoring of high-speed spindle rotation accuracy, and in particular relates to an online monitoring device for radial rotation accuracy of a spindle. Background technique [0002] Spindle rotation error is an important index to measure the accuracy of machining centers and machine tools. The relevant research results show that 30%-70% of the roundness error in precision turning is caused by the rotation error, and the higher the machining accuracy of the machine tool, the larger the proportion. The rotation error also directly reflects the dynamic performance of the machine tool. Through the test and analysis of the rotation error, the minimum shape error and the best surface quality that can be achieved under ideal processing conditions can be predicted; it can also be used for machine tool processing error compensation control, Determine the cause of machining errors, etc. With the continuous...

AI Technical Summary

Problems solved by technology

[0003] The traditional rotation error measurement method, such as measuring the radial runout with a dial indicator, cannot separate the rotation error of the spindle from the roundness error, which often mixes the roundness error of the spindle into the rotation error of the spindle

Most of the other rotary error measurement methods belong to offline measurement methods, and in these methods, non-contact displacement sensors are often used to measure the vibration of the main shaft. However, due to the high accuracy of the sensor and the very small initial installation distance between the main shaft and the traditional The installation method of the sensor is to directly connect the sensor head with the threaded hole on the bracket at the end of the spindle. On the one hand, this installation and adjustment method makes the sensor cable rotate along with it when the sensor is screwed into the threaded hole, otherwise it may cause the sensor line to be damaged. The cable is twisted, and the installation is extremely inconvenient; on the other hand, due to the large thread pitch, the distance between the sensor and the spindle surface is difficult to control and adjust accurately, so this sensor installation and adjustment method is inconvenient in actual operation

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