Numerically-controlled machine tool spindle unit static stiffness testing device and method

Abstract

The invention discloses a numerically-controlled machine tool spindle unit static stiffness testing device and method and belongs to the technical field of spindle performance detection. The device comprises a bottom frame; the inner wall of the bottom frame is in lap joint with the outer surface of a moving frame; and the upper surface of the moving frame is fixedly connected with the lower surface of a connecting block. According to the numerically-controlled machine tool spindle unit static stiffness testing device and method, an electric hydraulic rod, a force application plate, a limiting placement hole, a measuring ring, a micrometer dial plate, a threaded cylinder and a screw rod are adopted, so that a second motor can be controlled to work, and the second motor can control a rotating frame to rotate by 90 degrees; and the above operation can be repeated, so that the testing of a spindle in a front-back direction can be realized. According to the device, the heights of the force application plate and the measuring ring can be adjusted, so that the device can be suitable for testing spindles of different sizes; meanwhile, the direction of loads applied to the spindles by the force application plate can be adjusted, and the radial static stiffness of the spindles can be tested in multiple directions, and therefore, the applicability and the test precision of the device are ideal.

Description

technical field [0001] The invention belongs to the technical field of spindle performance detection, in particular to a static stiffness test device and a test method for a spindle unit of a numerically controlled machine tool. Background technique [0002] The main shaft is the core functional part of the machine tool, and its performance directly affects the performance of the machine tool. The axial static stiffness of the spindle refers to the ability of the spindle unit to resist deformation under the action of axial load. Usually, the axial static stiffness of the spindle is represented by the load applied in the direction of axial displacement when the front end of the spindle rotor produces a unit axial displacement. stiffness. The axial static stiffness of the spindle is an important index to evaluate the quality of the CNC machine tool and the design of the spindle unit. It will not only affect the geometric accuracy and surface quality of the machined parts, but...

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Problems solved by technology

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a static stiffness testing device and testing method for the spindle unit of a CNC machine tool, which solves the problem that the detection of the spindle of the existing machine tool can only apply a vertical load to a certain position of the spindle. The position adopts the load detection method in the same direction, which is prone to errors. At the same time, it is sometimes necessary to replace different clamping mechanisms for the detection of different sizes of spindles. Therefore, the accuracy and practicability of the existing test devices are not ideal.

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