Analysis About the Failure Mechanism of the Sleeves in Sink Roll System
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TECHNICAL ARTICLE—PEER-REVIEWED
Analysis About the Failure Mechanism of the Sleeves in Sink Roll System Yafei Shi . Jinyu Tong . Qiankun Zheng . Sihong Rao . Huijin Jin . Sixian Rao
Submitted: 29 July 2017 / in revised form: 15 October 2017 / Published online: 16 January 2018 Ó ASM International 2018
Abstract Sleeves and bushings were important expendables applied of sink roll system in hot-dip galvanizing lines, but the quick wear failure of the sleeves and bushings could significantly influence the stability the sink roll system and decreased the on-line life cycle substantially. To uncover the quick failure mechanism of the sleeves and bushings, the contact stress and friction coefficient between the sleeves and bushings were analyzed; the results indicated that under the action of high tensile stress in the steel strip, the contact stress between the sleeves and bushings could exceed 100 MPa; at the meantime, high contact stress induced high friction coefficient; in addition, the alloying between zinc and steel could decrease the surface hardness and hard zincilate particles could participated in the abrasion, the sleeves and bushings would come to quick wear failure under the combinations of the factors above. Keywords Wear failure Hot-dip galvanizing lines Sink roll system Sleeves Bushings
Introduction Hot galvanized plate is widely used in automobile industry, construction industry and daily life. Great demands improved the quick development of hot-dip galvanizing in recent years in China, but some problems troubled most
hot-dip galvanizing lines in China and limited the production efficiency. Low on-line life cycle of sink roll system was among the problems which seriously limited the production efficiency [1–3]. In hot-dip galvanizing lines, the steel strip passes through the sink roll immersed in liquid zinc (The temperature of liquid zinc in the zinc pot is controlled at 460 ± 5 °C [4–6].), changes its direction, then rises vertically (shown in Fig. 1) and passes through the correction roll and stabilizer roll sequentially. The sleeves are installed on the both ends of sink roll (shown in Fig. 2), correction roll and stabilizer roll, and due to abrasion (induced by heavy load) and liquid zinc corrosion (induced by the alloying between zinc and steel when immersed in liquid zinc) [7, 8], the sleeves and bushings would wear seriously (shown in Fig. 3); the serious abrasion could influence the stability of the sink roll system seriously and decreased the on-line life cycle substantially [1]. Analysis on the dominant influencing factors of on-line life cycle in sink roll system indicated that the abrasion between the sleeves and bushings did significantly decrease the on-line life cycle of sink roll system [1, 9, 10], and then investigation on the abrasion between sleeves and bushings was important to clarify the failure mechanism of the sleeves and bushings.
Materials and Equipments Y. Shi J. Tong Q. Zheng H. Jin S. Rao (&) School of Mechanical Engineering, Anhui University of Technology
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