Calculation method of pressure during conical-surface oil-pressure interference installation process

Abstract

The invention relates to a calculation method of a pressure during a conical-surface oil-pressure interference installation process. The method comprises the following steps: step 1, establishing a three-dimensional model of conical-surface interference installation; step 2, carrying out finite-element grid division on the three-dimensional model; step 3, setting a contact pair and adjusting an initial contact state; step 4, selecting a contact algorithm of a finite element analysis; step 5, carrying out constraint and load application on the three-dimensional model; and step 6, checking an overall simulation process and result by using a postprocessor of the finite element analysis, and obtaining a curve of changes of an axial press-in force and a radial contact pressure with a pull-up amount during the installation process. According to the invention, the part three-dimensional model is established according an actual dimension and finite-element non-linear contact calculation is carried out by using an enhanced lagrangian method so as to obtain the axial press-in force and the radial contact pressure; and the calculation based on the finite-element method is precise and reliable; and a theoretical basis is provided for accurate oil pressure application during the conical-surface interference installation process.

Description

technical field [0001] The invention relates to a pressure calculation method in the installation process of conical surface oil pressure interference. Background technique [0002] At present, the oil pressure interference installation of the conical surface generally uses a press to pass high-pressure oil into the oil inlet ring groove between the containing part and the contained part. Applying radial oil pressure will cause the containing part and the contained part to occur at the joint surface Elastic deformation forms a gap, and at the same time exerts an axial pressing force on the end face of the containing part, so that the relative axial displacement of the containing part and the contained part occurs. When the relative axial displacement between the parts reaches the conical surface interference installation After the required position, first cut off the radial oil pressure in the oil inlet ring groove on the joint surface, and then stop the axial pressing force...

AI Technical Summary

Problems solved by technology

Since the strain gauges cannot be pasted on the joint surface when the oil pressure interference of the conical surface is installed, it is difficult to actually measure the values ​​of the axial pressing force and the radial contact pressure. Therefore, in engineering, the thick-walled cylinder theory in elastic mechanics is generally used as the Based on the formula in the mechanical manual, calculate the axial press-in force and radial contact pressure of the conical surface interference installation, obtain the relationship curve between the axial oil pressure, radial oil pressure and the push-in amount during the installation process, and oil the parts Pressure interference installation, but at this time the axial press-in force and radial contact pressure are calculated under certain assumptions: the strain of the part is within the elastic range; the containing part and the contained part are two equal-length thick-walled cylinders , the pressure on the contact surface is evenly distributed; the three-dimensional stress in space is simplified to a two-dimensional stress state in the plane, that is, the axial stress is equal to zero. It is simplified as two thick-walled cylinders of equal length and calculated under the state of plane stress. There is a deviation between the theoretical value and the actual value of the radial contact pressure and axial indentation force. Therefore, the elastic mechanics method is used to calculate the axial indentation force and the diameter. The contact pressure is not accurate and perfect enough, which has a crucial influence on the accurate application of axial oil pressure and radial oil pressure when the conical surface oil pressure interference is installed.

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