Flame correcting method for rudder horn shell plate

Abstract

The invention discloses a flame correcting method for a rudder horn shell plate. The method comprises the following steps of: A, reversing the rudder horn shell plate, placing four corners of the rudder horn shell plate on cushion blocks with equal heights correspondingly to ensure that one gap between one corner or a pair of corners and the cushion block exists; B, longitudinally drawing a heating line on the rudder horn shell plate and applying vertical pressure to the upper surface of the shell; C, heating the shell plate along the heating line; D, after cooling, observing whether the gaps between the four corners of the rudder horn shell plate and the cushion blocks exist, if so, appropriately increasing the vertical pressure, measuring the longitudinal size of the rudder horn shell plate, drawing the heating line on the rudder horn shell plate again according to the longitudinal deformation of the rudder horn shell plate, and heating; repeating operation according to the step D until the gaps between the four corners of the rudder horn shell plate and the cushion blocks do not exist, and the longitudinal deformation of the rudder horn shell plate meets the accuracy requirement; and F, removing the vertical pressure. The steps of the flame correcting work can be greatly reduced, and a large amount of gases required by flame heating, such as oxygen, acetylene and the like can be saved.

Description

technical field [0001] The invention relates to a flame straightening method, in particular to a flame straightening method for a shell plate of a rudder arm. Background technique [0002] The shell plate of the ship rudder arm is generally made of steel plate, which is pressed and formed by a mold. In the existing processing technology for the shell plate of the rudder arm, due to the large thickness of the shell plate of the rudder arm, the hydraulic press cannot provide enough pressure for the mold to press and form the steel plate at one time. For this reason, the current practice is to use a 1000T-1500T hydraulic press to provide pressure for the mold, and form the rudder arm shell plate by segmental pressing, and the rudder arm shell plate formed by segmental pressing has relatively high internal stress. After a period of time, the shell plate of the rudder arm will undergo a large degree of longitudinal deformation and twist deformation. Therefore, after the machini...

AI Technical Summary

Problems solved by technology

However, in this step-by-step correction method, since the distortion correction process will cause new lateral or longitudinal deformation of the rudder arm shell, the horizontal or longitudinal deformation must be corrected after the distortion correction, and in order to meet the accuracy requirements , often requires multiple corrections

Obviously, such repeated heating will inevitably increase the cycle of the entire correction work, and consume a large amount of oxygen, acetylene and other gases required for flame heating; in addition, the correction effect is poor.

Images