Modal analysis method of static pressure main spindle at micro scale

A technology of hydrostatic spindle and modal analysis, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as different influences, air thinning effects, errors, etc

Active Publication Date: 2015-11-25
BEIJING UNIV OF TECH
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Problems solved by technology

In the previous studies, the modal performance of the spindle at the macro scale was simply studied, but under the actual working conditions of the aerostatic spindle, since the bearing clearance is in the micro-scale range, this leads to the rarefi

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  • Modal analysis method of static pressure main spindle at micro scale
  • Modal analysis method of static pressure main spindle at micro scale
  • Modal analysis method of static pressure main spindle at micro scale

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Embodiment Construction

[0022] The method of the present invention is realized by a software program, including MATLAB and ANSYS software.

[0023] The flowchart of the method of the present invention is as figure 1 As shown, it specifically includes the following steps:

[0024] Step 1. According to the working condition of the static pressure spindle, the flow factor Q is used to simulate the rarefaction effect of the gas inside the bearing.

[0025] Step 2: Establishing the distribution model of the air film pressure of the hydrostatic bearing considering the rarefaction effect, taking the flow factor into account, and establishing the Reynolds equation at the microscale.

[0026] In step 3, the equation obtained in the previous step is dimensionless to facilitate further calculation and solution.

[0027] Step 4, write a program with MATLAB language, solve the dimensionless equation, and obtain the bearing air film pressure distribution.

[0028] Step 5, calculate the bearing stiffness and dam...

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Abstract

A modal analysis method of a static pressure main spindle under a micro scale includes: selecting and researching a flow factor in a rarefaction effect which can embody characteristics of air in a bearing at the micro scale; establishing an equation of pressure distribution of the aerostatic bearing, wherein the equation considers the case of the flow factor in the rarefaction effect at the micro scale; solving the equation to obtain the pressure distribution of the bearing, and then obtaining a rigidity and damping value of the bearing; taking the rigidity and damping value of the bearing calculated at the micro scale as a rigidity and damping value of a spring element, and thus embodying an effect of the bearing on a main spindle; establishing a main spindle model by a finite element analysis software ANSYS; and determining material properties and boundary conditions, and solving the model and obtaining a mode of the main spindle. According to the invention, the influences of the rarefaction effect are considered, the accuracy of the calculation is improved, so that the invention has certain theoretical guidance meaning in the research of dynamic performance of the main spindle.

Description

technical field [0001] The invention relates to a modal analysis method suitable for a static pressure spindle at a micro scale, belonging to the field of fluid dynamics calculation. Background technique [0002] Precision and ultra-precision machine tools are the basis for precision and ultra-precision machining. The accuracy of the machine tool spindle directly affects the machining accuracy of the workpiece, so the spindle is the core component of the ultra-precision machine tool to ensure the machining accuracy. The processing of microstructures puts forward very high requirements for ultra-precision machine tools, especially the spindle components. Not only must they have high rotation accuracy, but they must also have high rigidity, good thermal expansion performance, vibration resistance and processing assembly. In the spindle box of various machine tools, the spindle is a high-speed, precise rotating part that bears large radial and axial cutting loads, so the spind...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陈东菊周帅董丽华范晋伟
Owner BEIJING UNIV OF TECH
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