Spin-forming method for long-barrel-shaped part board

Abstract

The invention discloses a spin-forming method for a long-barrel-shaped part board. The spin-forming method comprises the following steps: firstly, selecting raw materials, and selecting an equipment compartment manufacturing raw material which is a 2024 aluminum alloy board; then, calculating to obtain the diameter and the thickness of a spun circular plate blank sheet according to the length, the outer diameter and the wall thickness of an equipment compartment as well as adding process allowance by virtue of the principle that the volume before and after forming of a spun part is unchanged; determining processing precision and a bilateral jerk value of a spinning mould, and selecting parameters of a spinning machine; under a room-temperature condition, carrying out room-temperature spin-forming workpiece trial production on the spun circular plate blank, thereby obtaining spin-formed workpiece blank; and when the surface of the spin-formed workpiece blank has pits with different depths, changing room-temperature forming into heating spin-forming, heating the spinning mould to overcome material deformation resistance, thereby obtaining a spin-formed workpiece. Circular plate blank is adopted for forming a long-barrel-shaped part with a relatively great length-diameter ratio, so that use of extrusion-formed seamless metal tube blank is reduced, and therefore, the manufacturing cost is reduced, the technological process is simplified, and the qualified rate of parts is high.

Description

technical field [0001] The invention relates to the technical field of spinning of cylindrical parts, in particular to a method for spinning of long cylindrical parts. Background technique [0002] The aircraft equipment cabin is a typical thin-walled long cylindrical part, which belongs to the cylindrical part with a large length-to-diameter ratio (generally refers to 2<length-to-diameter ratio<10) that needs to be thinned strongly, especially the rear end surface has a large inclination angle and a length of 10mm. For the preparation of cylindrical parts on the inclined table, it is difficult to determine the gap between the blank and the mold. After the part is formed, it often does not fit the mold and the part is short of material. Therefore, repeated sample trial production is required to select this parameter, and the plate Under the extrusion of the rotary wheel, the blank flows and gradually thins and sticks to the mandrel, causing great difficulties; there ar...

AI Technical Summary

Problems solved by technology

[0002] The aircraft equipment cabin is a typical thin-walled long cylindrical part, which belongs to the cylindrical part with a large length-to-diameter ratio (generally refers to 2<length-to-diameter ratio<10) that needs to be thinned strongly, especially the rear end surface has a large inclination angle and a length of 10mm. For the preparation of cylindrical parts on the inclined table, it is difficult to determine the gap between the blank and the mold. After the part is formed, it often does not fit the mold and the part is short of material. Therefore, repeated sample trial production is required to select this parameter, and the plate Under the extrusion of the rotary wheel, the blank flows and gradually thins and sticks to the mandrel, causing great difficulties; there are two main conventional methods for this: one is to use metal cylinder blank spinning forming, and for high precision For the required parts, the metal tube blank needs to be processed by rough turning and finishing before spinning; Longitudinal welds; at the same time, use metal billet spinning to form thin-walled cylindrical parts. Seamless metal billets are generally extruded, which requires forming molds, high cost, long procurement cycle, and rough turning is required before spinning , fine car, increased blank prefabrication process; in addition, using flat blank roll bending welding to make spinning cylinder billet has high requirements for weld seam quality, otherwise the weld seam is easy to break during the spinning process, which will cause the parts to fail to form, and the spinning During press forming, in order to facilitate the demoulding of the formed parts, a certain gap must be left between the blank and the mandrel. If the gap is small, it will be unfavorable for demoulding. If the gap is large, it will be difficult to attach the mold during the flow of the blank, resulting in a shortage of parts. Product qualification rate is low