Roll bending forming die and forming method of large-curvature semi-arc-shaped pipe orifice reinforcing part

Abstract

The invention discloses a roll bending forming die and a forming method of a large-curvature semi-arc-shaped pipe orifice reinforcing part. The forming die comprises a forming cam, a forming concave wheel and a driven concave wheel; the forming cam, the forming concave wheel and the driven concave wheel are respectively mounted on three different rollers of an asymmetric three-axis roller bendingmachine; during forming, blank positioning is carried out firstly, then the relative position relation between the forming cam, the forming concave wheel and the driven concave wheel is set, then thethree-axis roll bending device is used for forming, and finally, the pipe orifice reinforcing part passes between the three synchronous rotating rollers and continuously generates axial and longitudinal plastic bending deformation, so that the required cross-sectional shape and the radian shape are obtained.

Description

technical field [0001] The invention relates to sheet metal part forming technology in the field of aircraft manufacturing, in particular to a roll-bending forming die and forming method for a large-curvature semi-arc nozzle reinforcement. Background technique [0002] In order to improve the take-off and landing performance of turboprop regional aircraft under complex conditions such as high-temperature plateau airports and full load conditions, a large number of high-temperature-resistant new materials and special structures are used in the design, especially in the design of the exhaust pipe near the engine, iron-based sedimentation is used The hardened superalloy A286 is used to replace the previous titanium alloy structural parts to meet the high temperature use environment of not lower than 600℃~700℃. [0003] A series of semicircular trapezoidal cross-section nozzle reinforcements are installed at the nozzles of turboprop regional aircraft exhaust pipes and sound-abso...

AI Technical Summary

Problems solved by technology

However, manual forming of the A286 alloy nozzle reinforcement is difficult and the surface quality is poor. In order to ensure the fit between the part and the pipe wall, a heating correction process needs to be arranged. The manufacturing cost is high and the production process is complicated.

The molding of this kind of semi-circular arc-shaped rib groove structural parts not only has technical constraints brought by material properties, but also has technological bottlenecks caused by complex structures.

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