Forming method and forming mould of tubular sheet-metal part

Abstract

The invention discloses a forming method and forming mould of a tubular sheet-metal part. Radial flanged holes and longitudinal welding seam are formed in the part and located on the two sides of the tubular part correspondingly. According to the known theoretical model of the part, an upper mould of the forming mould is of a T-shaped structure, a semi-circular convex-type face is arranged at the lower end of the upper mould, and flanged bosses and guiding holes are formed in the convex-type face; a semi-circular concave-type face is arranged at the center of the upper portion of a lower mould, and guiding pins are arranged at the bottom of the concave-type face; a core mould is in a cylindrical shape, and a welding groove and through holes matched with the guiding pins are formed in the core mould; a U-shaped semi-finished product of the part is formed through the upper mould and the lower mould; the upper mould is made to be separated from the semi-finished product of the part, the core mould is placed in a semi-finished part groove, the wall of the U-shaped groove of the semi-finished part is flapped inward firstly to complete seam butting, and welding and process lug piece cutting are carried out along the welding groove.

Description

technical field [0001] This application relates to aircraft manufacturing technology, and further to the manufacture of aircraft sheet metal parts, specifically a method for forming tubular sheet metal parts and a forming mold, especially suitable for thick plates, single weld seams, and multi-pass flanging holes in the same direction Forming of straight tubular sheet metal parts. Background technique [0002] In the field of aircraft parts manufacturing, pipes are like human blood vessels covering every corner of the aircraft. In order to meet the functional requirements, branch pipes with multiple diameters are often connected to the main pipe. Considering the long-term use requirements of high-pressure environment during the life of the aircraft, strict manufacturing requirements are put forward for this type of parts. First, to improve product strength and safety, it is necessary to reduce the number of welds as much as possible; second, to facilitate welding, improve p...

AI Technical Summary

Problems solved by technology

However, due to the particularity of its structure, the implementation of single-slit multi-pass straight pipe is poor in manufacturability

The existing technology is to form the flanging hole first in the flat state; then the semi-finished product containing the flanging hole is continuously bent and formed by a three-axis roll bender, and finally the deformation is completely repaired manually; the traditional method is only suitable for low flanging and thin plate parts take shape

The main disadvantages of the traditional method are as follows: First, the rigidity of the sheet after the flanging hole is formed, and the interference forming of the flanging hole and the roller shaft is difficult; second, the deformation of the flanging hole after forming is large and the diameter of the pipe is irregular, and the production efficiency is low , requires high skill of the operator; third, the product quality is unstable, and it is difficult to meet the accuracy requirements of butt welding with multiple pipes in space at the same time

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