Analysis and optimization method of static pressure guide rail to suppress inertia force impact

A static pressure guide rail and optimization method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems that affect machining accuracy, damage tools or workpieces, etc., and achieve the effect of improving resistance and reliability

Inactive Publication Date: 2018-03-30
BEIJING UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This shaking not only affects the machining accuracy, but also has the potential to damage the tool or workpiece

Method used

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  • Analysis and optimization method of static pressure guide rail to suppress inertia force impact
  • Analysis and optimization method of static pressure guide rail to suppress inertia force impact
  • Analysis and optimization method of static pressure guide rail to suppress inertia force impact

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Embodiment Construction

[0033] Take the guide rail slider offset δ=2×10 -5 m, Q e =3.3×10 -6 m 3 / s, as an example when the single-row sliding seat is equipped with 5 oil pads. Such as figure 2 As shown, the length of the oil pad is L, the width is B; the length of the oil pocket is l and the width is b; the thickness of the designed oil film is H 0 .

[0034] When solving the pressure, the Reynolds equation boundary condition is introduced:

[0035]

[0036] according to figure 1 As shown in the flow chart, the pressure distribution in each oil pad and the deformation distribution of the guide rail surface are calculated, and the bearing capacity and resistance moment of the guide rail are calculated based on the results. Among them, the bearing capacity of the static pressure guide rail is used to support the weight of the gantry frame, and the self-weight of the gantry frame hardly changes during the working process, so the actual bearing capacity of the static pressure guide rail is co...

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Abstract

The invention relates to an analyzing and optimizing method for a hydrostatic guideway to inhibit inertia force impact, and belongs to the technical field of hydrostatic support and lubricating design. The hydrostatic guideway is widely applied to a heavy machine tool. When a gantry of the heavy machine tool is started or braked, the heavy machine tool is swung because of the influence of the inertia force, so the influence on the processing accuracy is caused, and the risk exists; when the hydrostatic guideway is designed, the requirement of bearing capacity needs to be met, and the influence of starting and stopping impact needs to be considered. The analyzing and optimizing method has the advantages that according to a hydrostatic guideway model of the heavy machine tool, a Reynolds equation for the change of oil film thickness is introduced; the bending deformation and linear offset are simultaneously introduced into the oil film thickness change process, so as to simulate the actual working condition; a finite difference method is used, and the iteration is performed by a successive overrelaxation method to solve a numerical solution of the pressure; according to the pressure solution and the oil supply parameters, the change of the bearing property under the tilting condition caused by different inertia forces is analyzed; the optimizing scheme is provided for the analysis results under the condition of attempting different oil pad structures, and the capability of the hydrostatic guideway resisting the inertia force impact is improved.

Description

technical field [0001] The invention relates to an analysis and optimization method for suppressing the impact of inertial force by a static pressure guide rail, which belongs to the technical field of static pressure support and lubricating design. Background technique [0002] At present, hydrostatic support systems are widely used in heavy machine tools, and hydrostatic guide rails are a typical application. The external oil supply pump provides pressure oil to the oil pad installed under the slide seat of the guide rail through the pipeline. The pressure of the oil in the oil pocket is the main part of the bearing capacity of the static pressure guide rail. The static pressure effect is the key to maintaining the pressure in the oil pocket. In general, the height of the gantry of a heavy-duty machine tool is several meters, and its own weight is more than 100 tons. Therefore, when starting or braking, it will inevitably shake due to the influence of inertial force. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 蔡力钢王语莫刘志峰程强
Owner BEIJING UNIV OF TECH
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