Method and device for detecting radial runout of lathe spindle in machining state

Abstract

The invention provides a method and a device for detecting radial runout of a lathe spindle in a machining state. The device comprises a host computer, a core rod absorbing and holding assembly and a dynamic adjusting and testing assembly, wherein the core rod absorbing and holding assembly is fixed on a to-be-machined round bar, and the core rod is absorbed on smooth tempered glass by a strong magnet; the dynamic adjusting and testing assembly is mounted on a bracket with a laser displacement sensor and a nylon push block as cores; the bracket can be arranged at any static part of a lathe body by a magnet base. When the radial runout of the lathe spindle is measured in the machining state, the nylon push block is driven by a differential screw mechanism to push the core rod on the tempered glass, meanwhile, displacement signals of the core rod during rotation are picked by the high-precision laser displacement sensor and transmitted to the computer for processing and displaying, fine adjustment is performed until a peak-to-peak value of a measured value is the minimum, and eccentricity is eliminated once; the measured value is filtered by the host computer, measurement signals with the same frequency as rotating speed are eliminated, and a finally obtained variable range of the measured value is the radial runout affecting machining quality.

Description

technical field [0001] The invention relates to the field of radial runout detection of machine tool spindles, in particular to a method for detecting radial runout of lathe spindles in a processing state, and also relates to a device for the detection method. Background technique [0002] At present, when evaluating the processing quality of a machine tool, the radial runout of the machine tool spindle is an important indicator. The radial runout of the spindle in the processing state can directly reflect the geometric errors such as roughness and roundness of the surface contour of the part. [0003] There are two types of existing detection methods. One is the contact measurement method. Generally, the stylus of the dial indicator or inductive micro-probe is in contact with the standard mandrel or steel ball installed on the spindle, and the spindle is rotated at a low speed to read the stylus. The amount of runout can get the rotation error of the spindle. Chinese inve...

AI Technical Summary

Problems solved by technology

The non-contact measurement method will not scratch the surface of the measured object, and the runout value can be measured at any speed, but there is still an eccentric error between the rotating shaft and the axis of the standard component or the center of the sphere, and the radial runout measurement cannot be performed in the cutting state.

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