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Non-contact detecting system of running dynamic stiffness of machine tool spindle

A detection system and machine tool spindle technology, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as difficulty in measuring spindle displacement and performance differences

Inactive Publication Date: 2013-09-04
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the responses measured here are all measured in the static state of the machine tool spindle, and the obtained static stiffness or dynamic stiffness all reflect the performance of the machine tool in a static state, which is still quite different from the performance in the actual machining process.
[0003] During the actual movement of the machine tool, the spindle is in a rotating state. At this time, it is difficult to directly apply a load to the spindle and directly measure the spindle displacement when the spindle is running.
The main difficulty is how to apply a constant load on the rotating spindle and how to obtain the deformation of the spindle in this state

Method used

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  • Non-contact detecting system of running dynamic stiffness of machine tool spindle
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  • Non-contact detecting system of running dynamic stiffness of machine tool spindle

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Embodiment Construction

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0028] In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a s...

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Abstract

The invention discloses a non-contact detecting system of the running dynamic stiffness of a machine tool spindle, wherein the spindle is arranged on a machine tool. The detecting system comprises a loading device, a force sensor and a displacement detecting device, wherein the loading device comprises a loading platform, at least one electromagnet and a test rod, a first end of the test rod is connected with the spindle, a second end of the test rod is adjacent to the electromagnet, and the electromagnet is powered on to generate electromagnetic force to load the test rod so as to drive the test rod to deflect. The dynamic stiffness of the machine tool acquired through the non-contact detecting system of the running dynamic stiffness of the machine tool spindle is of more practical significance than the dynamic stiffness of the machine tool tested in a static state, dynamic performance of the machine tool is reflected more accurately, acquired stiffness parameters can be used for evaluating the dynamic performance of the machine tool, and the non-contact detecting system is favorable for identifying weak links of the performance of the machine tool and provides a test method for improving the performance of the machine tool.

Description

technical field [0001] The invention relates to the technical field of dynamic performance detection of machine tools, and more specifically relates to a non-contact detection system for the rigidity of the main shaft of a machine tool. Background technique [0002] Stiffness is an important indicator for evaluating the performance of machine tools, reflecting the ability of machine tools to resist deformation during processing. Machine tool stiffness is generally expressed as the ratio between the external load acting on the machine tool and the deformation of the machine tool. When the external load is a static force, this stiffness is called static stiffness, while evaluating the ability of the machine tool to resist dynamic loads is called dynamic stiffness. At present, the general method of measuring the stiffness of the machine tool is to apply a certain external load to the machine tool through a certain loading device, then measure the deformation of the machine too...

Claims

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Application Information

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IPC IPC(8): G01M13/00
Inventor 张建富冯平法许超郁鼎文吴志军
Owner TSINGHUA UNIV
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