Metal diaphragm tightening method and equipment based on temperature control stress

Abstract

The invention discloses a metal diaphragm tightening method and equipment based on temperature control stress. The method comprises the following steps: constructing a first shell-solid part model of a metal diaphragm and upper and lower pressing rings; dividing shell unit grids of a metal diaphragm and entity unit grids of upper and lower pressing rings, and applying attributes and thermodynamic parameters of a material to the corresponding unit grids; setting a displacement loading boundary condition, a contact limiting condition and an initial temperature field parameter, and setting a temperature-displacement coupling type analysis step to obtain stress distribution after the diaphragm is cooled to room temperature and bearing reaction information of the compression ring; copying a second shell-solid grid model, modifying initial temperature field parameters for multiple times, setting temperature-displacement coupling type analysis steps, and summarizing to obtain a relation curve of stress along with the initial temperature after the metal diaphragm is cooled to room temperature; the tightening stress of the metal diaphragm can be accurately controlled, the metal diaphragm tightening state meeting different machining requirements is achieved, and a foundation is laid for follow-up welding and cutting machining of the metal diaphragm and the base.

Description

technical field [0001] The invention belongs to the technical field of fastening equipment, and more particularly, relates to a method and equipment for tightening a metal diaphragm based on temperature control stress. Background technique [0002] Pressure sensor is an instrument used to detect the performance and parameters of equipment and products in the modern industrial production process. It has been widely used in aviation, aerospace, electronics and other industrial fields. Among them, the metal diaphragm is an important part of the pressure sensor, which can convert the pressure signal into an electrical signal and output it to the terminal to achieve the purpose of detection. [0003] The metal diaphragm is generally made of square or circular metal film material. The metal diaphragm installed on the pressure sensor needs to maintain a certain stress, that is, the diaphragm is in a tight state, and the stress will not relax during long-term service. , so during t...

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Problems solved by technology

At present, the method of tightening the metal diaphragm mostly adopts the method of mechanical loading and displacement, but it often makes the tension film equipment bulky and the manufacturing cost increases

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