Method and device for forming metal reducer pipe based on laser shock wave technology

Abstract

The invention discloses a method and device for forming a metal reducer pipe based on a laser shock wave technology and belongs to the technical field of laser processing. In the invention, the upper end part, separated from a pipe fitting, of a plugging rod is coated with a laser energy absorption layer; a laser beam enters the interior of a pipe billet to be formed along the axis of the pipe billet, thereby irradiating on the absorption layer on the upper end part of the plugging rod; the absorption layer absorbs laser energy so as to be gasified and ionized, thus forming high-voltage plasmas; and the high-voltage plasmas quickly expand to form a high-amplitude shock wave, thereby promoting the expansion of the pipe billet until the pipe billet is jointed with the profile of a mould, therefore the deformed shape of the pipe billet is in accordance with the profile of the mould. In the invention, the laser shock wave controlled in parameter is utilized as a power source for internal high pressure forming of the pipe billet, and good safety is provided; and the method and device provided by the invention are suitable for not only forming the pipe billet of a material extremely low in yield limit, but also forming the pipe billet with high yield strength; besides, continuous multi-pulse laser irradiation can be performed and uninterrupted multi-impact can be carried out; and high production efficiency is ensured.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and relates to a method and a device for forming a metal reducing tube based on laser shock wave technology. Background technique [0002] As a functional element in the pipeline system, an elastic deformation compensation element, and a transition joint for connecting different pipe fittings, the reducing pipe is widely used in the fields of aviation, aerospace, and automobiles. The commonly used processing methods include: segmental stamping and welding, Explosive forming and internal high pressure hydraulic forming. [0003] Segmental stamping and welding is currently the most commonly used processing method for variable diameter pipes. It first divides the variable cross-section pipe fittings designed in the drawing into several different parts according to the diameter and changing trend, and then performs different parts for different parts. Stamping and forming, and finally the p...

AI Technical Summary

Problems solved by technology

However, when forming, complex hydraulic equipment is required, and the internal pressure and axial load are often difficult to match reasonably, resulting in instability of the pipe after forming, and failure of the pipe fittings such as folding, wrinkling and cracking.

At present, this technology is limited to the forming of pipe fittings of materials with low yield strength such as aluminum alloy and stainless steel, and it is difficult to adapt to the forming of pipe fittings of titanium alloys with high yield strength.

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