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Numerical and experimental investigation on precision forming of ribbed tube by cold drawing process

Li Wei, Wang Baoyu, Liu Shengqiang, Feng Pengni, Shen Jinxia, Yang Xiaoming

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e135

Ribbed tube is a new type of nuclear fuel cladding tube. The integrated precision forming of the rib is one of the technical bottlenecks. The cold drawing process of ribbed tube was investigated by combining finite element (FE) simulation and experiment in this study, and the results show that the insufficient rib filling and useless rib groove defects are the main problems. The insufficient radial metal flow on the outer surface of the tube leads to insufficient rib filling. The rib groove defects are caused by the relatively adequate radial and circumferential metal flow on the inner surface of the tube. Further, the effect of process parameters on rib height (RH), rib groove depth (GD) and drawing force was investigated by single-pass drawing process. The RH, GD and drawing force decrease with the increase of die angle (α) and increase with the increase of the initial tube outer diameter (Di) and die groove angle (β). Increasing the initial wall thickness (Wi) can markedly reduce the GD. On these basis, a modified die with arc surface was proposed to improve the rib filling by increasing the radial metal flow. And a modified billet with special-section is used as the preform to reduce the rib groove defects. Further, the forming experiment of ribbed tube is carried out by multi-pass drawing with the above improved methods. The experimental results show that the rib filling can be significantly improved, and the rib groove can be eliminated, which verifies the effectiveness of the proposed methods.

Analiza procesów wyciskania promieniowego realizowanych w zmiennych warunkach kinematycznych

Mroczkowski M., Richert J., Nowak J.

Rudy i Metale Nieżelazne

2005

R. 50, nr 10-11

602-609

Przedstawiono analizę warunków plastycznego płynięcia metalu w różnych procesach wyciskania promieniowego. Komputerowe symulacje procesów przeprowadzono przy użyciu programu FORGE2. Analizowano płynięcie metalu przy zastosowaniu jednostronnego oraz dwustronnego procesu wyciskania. Stosowano także narzędzia o różnym kształcie. Stwierdzono, że zachowanie stateczności plastycznego płynięcia jest możliwe tylko w przypadku zastosowania wykrojów matrycowych, będących w stanie kształtować wyroby w obecności naprężeń wszechstronnie ściskających (sigma(m) < 0), czyli wówczas, gdy ściskające naprężenia osiowe i promieniowe będą przeważać nad dodatnimi naprężeniami obwodowymi.

The analysis of conditions of plastic metal flow for different processes of the radial extrusion was presented in this paper. The computer simulations were carried out using the FORGE2 software. The metal flow by use of one-sided and two-sided extrusion process was analysed. Different shapes of dies were applied also. It has been found that conservation of stability conditions of plastic flow is possible only in this case when the die impressions have the capability to forming of product in hydrostatic pressure (sigma(m) < 0), that is, when the axial and radial compressive stresses are predominated over the circumferential tensile stresses.