Radial-axial composite non-contact loader and machine tool spindle stiffness test system

Abstract

The invention discloses a radial-axial composite non-contact type loader and a machine tool main shaft rigidity test system using the non-contact type loader. The non-contact type loader comprises a radial loading portion and an axial loading portion. The radial loading portion comprises a radial coil fixed to a radial iron core. The axial loading portion comprises an axial coil fixed to an axial iron core. A test rod in the test system, the radial coil and the axial coil are arranged in a non-contact mode. The radial coil and the test rod form a closed magnetic circuit. The axial coil and the test rod form the closed magnetic circuit. A three-direction dynamometer in the test system tests a radial force and an axial force of the test rod. The invention provides a set of experiment apparatus used for researching an influence of an axial cutting force on machine tool operation main shaft bending rigidity, and experiment means and the method are provided for improving dynamic performance of a machine tool main shaft.

Description

technical field [0001] The invention relates to the field of dynamic performance testing of machine tools, in particular to a radial-axial compound non-contact loader and a machine tool spindle stiffness testing system. Background technique [0002] High-speed and high-precision machining are the development direction of the machinery manufacturing industry, and the improvement of workpiece machining accuracy depends on the research on factors affecting cutting machining accuracy. At present, the main reason that restricts the machining accuracy of machine tools is vibration, including forced vibration caused by the mass imbalance of the spindle, regenerative chatter that is more likely to occur during the cutting process, and external vibration sources. The prediction of the forced vibration of the machine tool spindle is an important way to improve the cutting accuracy, but the prediction accuracy is often limited by the failure to consider the changes in the spindle stiff...

AI Technical Summary

Problems solved by technology

Due to the influence of centrifugal force when the spindle of the machine tool is rotating, the pressure on the joint surface of the spindle and the tool holder will weaken, and the contact stiffness of the joint surface will weaken, which will weaken the bending stiffness of the spindle components. In addition, because the bearing is the weak link of the spindle component rigidity, the spindle When the bearings at both ends are under the action of internal and external centrifugal force and gyro torque, the bearing stiffness will also change, which will also affect the bending stiffness of the main shaft components

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