A Roll-Extrusion Composite Forming Method for Thin-walled Ring Parts with Ribs and Large Height-to-Diameter Ratio

Abstract

The invention discloses a rolling and extruding combined forming method for ribbed thin-wall ring components with large height-diameter ratios. The rolling and extruding combined forming method includes steps of setting cover dies for constraining ring blanks and placing the ring blanks in the cover dies; driving main rollers to rotate by power systems of ring rolling mills to drive the cover dies to drive the ring blanks to rotate and linearly feeding core rollers to extrude the ring blanks to increase the heights of the ring blanks until the heights of the ring blanks are consistent with those of the cover dies; replacing the core rollers by extruding male dies; adjusting auxiliary rollers opposite to the main rollers to allow the auxiliary rollers to cling to the surfaces of the cover dies; driving the male dies by hydraulic cylinders to forwardly move and extrude ring components which are in contact with working surfaces of the male dies, and forming local mesh rib structures by means of extruding; allowing the male dies to return and allowing the auxiliary rollers to rotate at the low speeds to drive the cover dies to rotate clockwise by certain angles; repeatedly carrying out previous steps until integral mesh rib structures are formed on the surfaces of the ring components by means of extruding. The rolling and extruding combined forming method has the advantages that the integral ribbed thin-wall ring components with the large height-diameter ratios can be seamlessly formed in a near-net manner, surface rib structure welding forming can be replaced, cutting machining can be obviously reduced, accordingly, the manufacturing efficiency and the product quality can be improved, the manufacturing costs can be reduced, and the manufacturing ranges can be extended.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a rolling-extrusion composite forming method for a thin-walled ring with a large height-to-diameter ratio with ribs. Background technique [0002] Thin-walled rings with large height-to-diameter ratio with ribs (hereinafter referred to as rings with ribs) are mainly made of aluminum alloy and other light materials, with small wall thickness, large height-to-diameter ratio, and longitudinal ribs, transverse ribs or criss-cross grid ribs on the surface. The material is difficult to deform and the structure is difficult to form special rings, which are indispensable high-performance lightweight components in aerospace and national defense equipment. The existing manufacturing method of this kind of ring with ribs is to adopt plastic processing methods such as ring rolling and spinning to integrally form the base of the ring, and then use welding and cutting me...

AI Technical Summary

Problems solved by technology

For the plastic forming ring base, due to the small wall thickness and high aspect ratio, it is difficult to make a billet by ordinary ring rolling (in order to avoid upsetting with a large aspect ratio, the billet needs to be repeatedly upset), and the roundness of the ring is difficult to guarantee (the ring The wall is thin and rigid, and it is easy to be flattened due to plastic instability during the rolling process), and it is usually necessary to increase the machining allowance of the wall thickness, resulting in an increase in cutting man-hours and material consumption

Spinning forming is currently mainly suitable for small and medium-sized rings with a diameter of about 1 meter. The defects of spinning rings with larger diameters are difficult to control and difficult to achieve with existing forming equipment.

For the ribbed structure on the surface of the ring, welding and cutting are not only very inefficient, but also the streamline damage caused by a large number of welding seams and cutting significantly weakens the structure and performance of the component

Although it has been reported that surface ribs are formed by plastic processing methods such as spinning and extrusion, these methods are limited by the forming process and equipment, and are only suitable for small and medium-sized rings and simple longitudinal or transverse ribs. components and more complex mesh ribs, which are often used in more advanced large aviation and weaponry

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