Method for Determining Dimensions of Deep Cylindrical Rings by Casting and Rolling Composite Forming

Abstract

A size determination method of blanks of casting and rolling compound forming deep-barrel-shaped ring parts belongs to the field of ring part processing forming design and is characterized by includes: (1) on the condition of only considering the axial height increasing, radial wall thickness reducing and diameter increasing of the ring parts before and after radial and axial extend-rolling, determining the extend-rolling ratio K and the ratio zeta of the wall thickness reducing amount and the height increasing amount according to the external diameter D, the internal diameter d, the radial wall thickness b and the axial height of force pieces of the deep-barrel-shaped ring parts; (2) obtaining the axial height h0 and the radial wall thickness b0 according to K=(boho) / (bh) and zeta=(b0-b) / (h-h0); (3) finally, obtaining the external diameter D0 and the internal diameter d0 of the blanks according to the principle that the size of the blanks before diameter axial extend-rolling is equal to the size of the force pieces of the ring parts after extend-rolling as well as the geometrical relationship of the blank dimensions D0=d-+2b0. The size determination method can accurately, quickly and conveniently determine the unique blank size when used for extend-rolling production of the casting and rolling compound forming deep-barrel-shaped ring parts, improves the design efficiency, shortens the production cycle, reasonably distributes the radial and axial deformation and ensures product performance quality.

Description

technical field [0001] The invention belongs to the field of ring processing and forming design, and in particular relates to a method for determining the size of a deep cylindrical ring blank formed by casting and rolling. Background technique [0002] At present, the size of the blank required for the deep cylindrical ring is mainly designed according to the method that the height remains unchanged before and after rolling, resulting in a large axial height and a large external dimension of the designed blank. Sometimes it is necessary to cast a large ring billet, which puts forward higher requirements for the equipment, makes billet making difficult, and is out of touch with the actual production of the factory. In addition, some methods rely on the principle of increasing the axial height, reducing the radial wall thickness, and expanding the diameter of such rings before and after deformation, and only rely on the principle of constant volume before and after plastic de...

AI Technical Summary

Problems solved by technology

[0002] At present, the size of the blank required for the deep cylindrical ring is mainly designed according to the method that the height remains unchanged before and after rolling, resulting in a large axial height and a large external dimension of the designed blank. It is necessary to cast a large ring billet, which puts forward higher requirements for the equipment, makes billet making difficult, and is out of touch with the actual production of the factory.

In addition, some methods are based on the idea of ​​increasing the axial height, reducing the radial wall thickness and expanding the diameter of such rings before and after deformation, and only rely on the principle of constant volume before and after plastic deformation to determine the blank size, which makes the design process cumbersome

In short, the current method for determining the size of the deep cylindrical ring blank has a long period of time, and the distribution of ring diameter and axial deformation during rolling is unreasonable, which increases production costs and reduces production efficiency.

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