Preparation method of bottom layer arched foil for elastic foil piece gas bearing

Abstract

The invention provides a preparation method of a bottom layer arched foil for an elastic foil piece gas bearing, comprising the following steps of: firstly, placing a bottom layer arched foil and a polytetrafluoroethylene plate between an upper die and a lower die; forming four uniformly-distributed cylindrical holes around the upper die and the lower die; penetrating a threaded rod through the cylindrical holes arranged on the upper die and the lower die; clamping the bottom layer arched foil and the polytetrafluoroethylene plate between the upper die and the lower die through first nuts and second nuts; tensioning the threaded rod by a hydraulic tensioner, and screwing the second nuts on the four threaded rods by a torque spanner so that the bottom layer arched foil with good forming precision can be obtained, wherein the constant torsion is guaranteed, a pretightening force applied to the bottom layer arched foil is guaranteed to reach to 15-50MPa and be kept for 0-100 hours. According to the preparation method, the size of the pretightening force can be controlled only by the hydraulic tensioner and the torque spanner, the different pre-tightening forces can be applied to the bottom layer arched foil as required, the load is even in distribution, and the height of the formed arched foil can be controlled, so that the preparation method has the characteristics that operation is simple and the height of the formed arched foil is controllable.

Description

technical field [0001] The invention belongs to the technical field of elastic foil gas bearing manufacturing, and in particular relates to a method for manufacturing an elastic foil gas bearing bottom arch foil. Background technique [0002] Elastic foil bearings have good adaptability and can operate for a long time under high temperature, high speed and high pollution conditions without auxiliary devices such as oil supply or control systems. Due to the surface forming accuracy requirements of the underlying arch foil of the elastic foil bearing Higher, the resilience of the material is better, and its processing method has always been a very difficult problem, mainly because it cannot accurately meet the requirements for processing, and there is a situation of large rebound. At present, there is no processing of the bottom arch of the elastic foil gas bearing. Special manufacturing method and apparatus for foil. Contents of the invention [0003] In order to overcome ...

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Problems solved by technology

[0002] Elastic foil bearings have good adaptability and can operate for a long time under high temperature, high speed and high pollution conditions without auxiliary devices such as oil supply or control systems. Due to the surface forming accuracy requirements of the underlying arch foil of the elastic foil bearing Higher, the resilience of the material is better, and its processing method has always been a very difficult problem, mainly because it cannot accurately meet the requirements for processing, and there is a situation of large rebound. At present, there is no processing of the bottom arch of the elastic foil gas bearing. Special manufacturing method and device for foil

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