Double-boosting type large-curvature coreless bending forming die of thin-walled pipe and forming method thereof

Abstract

The invention relates to a double-boosting type large-curvature coreless bending forming die of a thin-walled pipe and a forming method thereof, and belongs to the technical field of pipe bending andforming. The technical problems that the bending difficulty is large and the pipe yield is low in the coreless bending forming process of the thin-walled pipe are solved. According to the technical scheme, the double-boosting type large-curvature coreless bending forming die is characterized by comprising a bending die, an insert die, a clamping die, a buffering die, a pressure die, an anti-creasedie and boosting dies, wherein the boosting dies are arranged at the tail part of the to-be-bent pipe; the pressure die and the anti-crease die are arranged in the middle of the to-be-bent pipe, anda pressure die groove is formed in the pressure die; the clamping die and the bending die are arranged on the head part of the to-be-bent pipe, and a bending die groove is formed in the bending die; the insert die is arranged on a notch of the bending die; and the buffering die is arranged at the end surface of the head part of the to-be-bent pipe. The invention further provides the forming methodof the bending forming die correspondingly. According to the bending forming die and the forming method, the bending limit of the relative bending radius in the coreless bending process is improved,the wall thickness of the inner wall of the pipe and the wall thickness of the outer wall of the pipe are basically uniform, the distortion degree of the cross section is small, and the requirement for the pipe with a small relative bending radius is met.

Description

technical field [0001] The invention belongs to the technical field of bending and forming of pipe fittings, and in particular relates to a double-assist type large-curvature coreless bending forming mold for thin-walled pipe fittings and a forming method thereof. Background technique [0002] Modern society has more and more stringent requirements for energy saving and environmental protection, and more and more attention has been paid to structural lightweight products. The bent pipe has the advantages of reasonable structure, precise size, toughness and low energy consumption. It also meets the requirements of modern society for light weight (hollow structure) and strong environmental protection. It is widely used in aerospace, ships, automobiles and Boiler and other industries. At present, steel pipes with relatively large bending radii (greater than 2.5) can basically achieve ideal results through cored or coreless bending, but too large a relative bending radius canno...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the existing technology, solve the technical problems of the existing thin-walled pipe fittings in the coreless bending forming process, which are difficult to bend and the yield of pipe fittings is low, and overcome the existing technical conditions to carry out large curvature of thin-walled pipe fittings at room temperature (Small bending radius) Insufficiency of coreless bending forming, improve the quality / forming limit of pipe bending with a relative bending radius of 1.0 to 1.5, and provide a double-boosting type thin-walled pipe fitting with large curvature coreless bending forming die and its Forming method

Images