Machining method of thin-walled shell with complex mesh

Abstract

The invention discloses a processing method of a thin-walled shell with complex grids. The method includes the following steps that a shell is obtained by turning a rough casting; the internal stressof the shell is reduced through vibration or thermal-cold cycling treatment, then the shell with the reduced internal stress is subjected to turning again to obtain a new shell; the new shell is subjected to milling to obtain the shell with the grids; the internal stress of the shell with the grids is reduced through vibration or thermal-cold cycling treatment; 2-3 mm of a first ring of the shellwith the reduced internal stress and the grids is removed through turning towards the outer surface below the center position of a groove; 2-3 mm of the inner surface, below a first transverse bar, ofthe large end of the processed shell with the grids is removed; a plurality of annular grooves are formed by turning the top of the outer surface of the processed shell with the grids. The deformation amount of the shell during processing is controlled so as to ensure that the shell finally meets the requirement of the processing accuracy.

Description

technical field [0001] The invention belongs to the technical field of numerical control machining of thin-walled shells, and in particular relates to a processing method for thin-walled shells with complex grids. Background technique [0002] Problems existing in traditional processing methods of thin-walled shells: [0003] 1. The roundness cannot meet the requirements due to the deformation of the shell [0004] The shell blank adopts the aluminum alloy casting process, and the casting forming process leads to a large casting internal stress inside the shell blank. During the processing, the excess metal material of the shell is continuously removed, the residual stress of the shell is released, and the rigidity of the shell is gradually weakened with the removal of the metal material, and the shell after processing is easily deformed. The traditional processing method cannot effectively release the residual stress of the shell, and cannot effectively control the deform...

AI Technical Summary

Problems solved by technology

During the processing, the excess metal material of the shell is continuously removed, the residual stress of the shell is released, and the rigidity of the shell is gradually weakened with the removal of the metal material, and the shell after processing is easily deformed

The traditional processing method cannot effectively release the residual stress of the shell, and cannot effectively control the deformation of the shell, and the roundness of the shell after processing cannot meet the requirement of 2mm

[0005] 2. The circumferential groove makes it difficult to process and clamp the shell grid structure

During the processing of the shell, the traditional processing method uses several pressure plates to press the large end face of the shell to fix the shell on the machine tool platform. After clamping, the large end face of the shell bears the axial pressure brought by the pressure plate, and The rigidity of the shell at the groove is not enough to withstand the axial pressure transmitted by the clamping of the shell. Traditional processing methods cannot prevent the shell from being subjected to axial pressure on the circumferential groove, which can easily lead to cracks at the circumferential groove of the shell. The shell is scrapped, and cracks are not easy to find, and the quality of the shell is very hidden

[0007] 3. Poor machining accuracy of shell grid web thickness

The deformation of the shell during processing leads to a deviation between the actual surface and the theoretical surface. The greater the deformation, the greater the deviation, and the worse the machining accuracy of the shell grid web thickness.

[0009] The above problems seriously affect the shell manufacturing accuracy and production quality stability

Images