Test device and test method for static stiffness of CNC machine tool spindle unit

Abstract

The invention discloses a static stiffness testing device and a testing method of a spindle unit of a numerically controlled machine tool, belonging to the technical field of spindle performance testing. Fixed connection with the lower surface of the connection block. The static stiffness test device and test method of the spindle unit of the CNC machine tool can control the second motor to work by setting the electro-hydraulic rod, the force applying plate, the limit placement hole, the measuring ring, the dial dial, the threaded barrel and the screw rod. The motor can control the rotating frame to rotate 90 degrees, and then repeat the above operation to realize the test of the front and rear directions of the main shaft. This device can adjust the height of the force plate and the measuring ring, and can be applied to the test of different sizes of the main shaft. At the same time, the force can be adjusted. The direction in which the plate applies the load to the main shaft can realize the radial static stiffness test of the main shaft in multiple directions, which makes the applicability and test accuracy of the device ideal.

Description

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

AI Technical Summary

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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