Dynamic milling force measuring method based on tool vibration displacement

Abstract

The invention discloses a dynamic milling force measuring method based on tool vibration displacement, and the method improves bandwidth of a measuring system, realizes precise measurement of dynamic milling force, can carry out dynamic compensation on the measuring system, improves bandwidth of the measuring system and realizes precise measurement of dynamic milling force. In order to overcome the limitation, in dimensions of processed workpieces, quality of processed workpieces, measured bandwidth, a mounting way and the like, of an existing dynamic milling force measuring method, the invention discloses a method for indirectly determining dynamic milling force through vibration displacement by utilizing measuring radial vibration displacement of a cutter bar of a rotary milling cutter during milling processing of a laser vibration measurer according to a relationship of vibration displacement and milling force of the milling cutter, solves the measuring distortion problem of milling force at a high milling speed of the milting cutter, carries dynamic compensation for the measuring system, improves bandwidth of the measuring system, and realizes precise measurement of dynamic milling force.

Description

technical field [0001] The invention belongs to the field of tool measurement, in particular to a dynamic milling force measurement method based on tool vibration displacement. Background technique [0002] The measurement of dynamic cutting force in cutting process is the most direct and critical information to monitor the running state of machine tools and troubleshoot machine tools. At present, the most commonly used cutting force measurement method is to use piezoelectric or strain gauge dynamometers. This method has been widely used Applied to the measurement of cutting force of CNC machine tools. However, for the measurement of the cutting force of rotating tools, this method still has the following problems: limited by the fixed effective area of ​​the dynamometer and the workpiece, the dynamometer can only measure the cutting force of a small workpiece; the dynamometer is sensitive to overload , The installation is inconvenient; the dynamic characteristics of the dy...

AI Technical Summary

Problems solved by technology

However, for the measurement of the cutting force of rotating tools, this method still has the following problems: limited by the fixed effective area of ​​the dynamometer and the workpiece, the dynamometer can only measure the cutting force of a small workpiece; the dynamometer is sensitive to overload , The installation is inconvenient; the dynamic characteristics of the dynamometer will change with the change of the workpiece quality, etc.

[0004] ① The vibration transmission rate from the sharp point to the main shaft is low;

[0005] ②Spindle vibration will affect the accuracy of measurement, which is not conducive to error separation;

[0006] ③The spindle motor generates electromagnetic interference to the capacitive displacement sensor, causing measurement errors;

Laser vibrometers are usually used to measure the vibration on the surface of a plane object. When measuring the vibration on the surface of a rotating object, the large roughness of the measured surface will cause speckle noise and velocity crosstalk, which will affect the accuracy of vibration measurement.

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