Soft measuring method of axial deformation quantity of rectangular rubber sealing ring based on flexible screwing assembly

Abstract

The invention relates to a soft measuring method of axial deformation quantity of a rectangular rubber sealing ring based on flexible screwing assembly. The method comprises the following steps that (1) a Mooney-Rivlin constitutive relation model of rubber materials is built; (2) a rubber material strain invariant and engineering stress relation model is built according to the constitutive relation; (3) a single-axis stretching model of rubber materials is built, and the strain invariant expressed by the axial decoration rate is worked out; (4) the strain invariant expressed by the axial decoration rate is substituted into the strain invariant and engineering stress relation model to obtain an axial engineering stress strain relation model; (5) a penalty function is adopted to convert the axial strain rate of the rectangular rubber ring and an engineering stress value model into a rectangular rubber ring axial strain rate and engineering rotation friction value model; (6) the rectangular rubber ring axial strain rate and engineering rotation friction value model is converted into a rectangular rubber ring axial strain rate and screwing torque value model. The method has the advantages that the soft detection of the rectangular rubber sealing ring axial deformation quantity in the flexible screwing assembly is realized.

Description

technical field [0001] The invention belongs to the technical field of rubber material mechanics, and relates to a soft measurement method for the axial deformation of a rectangular rubber sealing ring based on flexible tightening assembly. Background technique [0002] With the rapid development of science and technology, in the flexible tightening assembly process, automated assembly gradually replaces traditional manual assembly, which improves the efficiency and consistency of assembly. Flexible tightening assembly technology is a control technology that uses torque-angle control to automatically tighten bolt parts and nut parts. The extremely important technical index is to ensure the airtightness of the assembly interface. [0003] As the main part of the sealing structure, the silicone rubber rectangular sealing ring is located in the sealing groove between the upper and lower metal flanges. Through the pre-tightening action of the bolts of the upper and lower flanges...

AI Technical Summary

Problems solved by technology

However, during the automatic tightening process, the rubber sealing ring is often located inside the assembly, and in most working conditions there is no external measuring equipment, so it is difficult to directly measure the deformation of the sealing ring

The automatic assembly using the torque-angle control strategy mainly judges the contact status with the sealing ring through the feedback torque. Since the silicone rubber sealing ring is a rubber material with high extensibility and low modulus, it has dual characteristics of material and geometry. Non-linear and incompressible characteristics, these characteristics bring great difficulties to the contact judgment of rectangular sealing rings, seriously affect the accuracy of contact judgment and affect the reliability of automatic assembly

[0004] At present, there are few methods at home and abroad to detect the axial deformation of the rubber rectangular ring during the flexible tightening assembly process, and the current method of indirectly measuring the axial deformation of the rubber rectangular ring through torque mainly relies on experiments and experience to judge. There are deficiencies in the reliability and precision of the method, and at the same time, it adds a lot of hidden dangers to the safety of production.

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