Separation mechanism for double cylinder with shrink fitting system used for ceramics conveying rollers

doi:10.1007/s11465-011-0234-y

Front Mech Eng

2011, Vol. 6

Issue (3) : 277-286 https://doi.org/10.1007/s11465-011-0234-y

RESEARCH ARTICLE

Separation mechanism for double cylinder with shrink fitting system used for ceramics conveying rollers

Wenbin LI(

), Hiromasa SAKAI, Shota HARADA, Yasushi TAKASE, Nao-Aki NODA

Department of Mechanical Engineering, Kyusyu Institute of Technology, Fukuoka 804-8550, Japan

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Abstract

Steel conveying rollers used in hot rolling mills must be exchanged frequently at great cost because hot conveyed strips induce wear and deterioration on the surface of roller in short periods. In previous studies, new roller structure was considered which has a ceramics sleeve connected with two steel shafts at both ends by shrink fitting. Here, although the ceramics sleeve can be used for many years, the steel shafts sometimes have to be exchanged for maintenance and reconstruction under the corrosive atmosphere. Since the thermal expansion coefficient of steel is about five times larger than that of ceramics, it is necessary to investigate how to separate the shrink fitting system by heating outside of sleeve and cooling inside of the shaft. Although how to separate the real roller has been discussed in the previous study, the separation mechanism has not been clarified yet. Therefore, in this study, several types of more fundamental models are investigated to understand the separation mechanism of real roller by the application of the finite element method. The results may be useful for designs of new rollers.

Keywords contact ceramics thermal stress heating finite element method

Corresponding Author(s): LI Wenbin,Email:wenbin-li@hotmail.com

Issue Date: 05 September 2011

Cite this article:

Wenbin LI,Hiromasa SAKAI,Shota HARADA, et al. Separation mechanism for double cylinder with shrink fitting system used for ceramics conveying rollers[J]. Front Mech Eng, 2011, 6(3): 277-286.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-011-0234-y
https://academic.hep.com.cn/fme/EN/Y2011/V6/I3/277

Fig.1 Layout of conveying rollers

Fig.2 Roller structure. (a) Conventional roller; (b) shrink fitting roller; (c) new shrink fitting roller (model A); (d) new shrink fitting roller (model B or real roller model)

Fig.3 Double cylinder model

Fig.4 Model A initially considered. (a) Dimensions (mm); (b) boundary condition

Fig.5 Atmosphere temperature

Fig.6 Real roller model with coordinate (mm)

Tab.1 Values of heat transfer coefficient and emissivity along the , (mm) coordinate in Fig. 6

Fig.7 Double cylinder models with 5 different boundary conditions. (a) Dimensions (mm); (b) thermal boundary condition; (c) mechanical boundary condition

Fig.8 Double cylinder model with coordinate (mm)

Tab.2 Values of heat transfer coefficient and emissivity along the , (mm) coordinate in Fig. 8

Tab.3 Material properties

Fig.9 three atmosphere temperature

Fig.10 Time vs / for three atmosphere temperature

Fig.11 Separation history of contact area

Fig.12 Temperature distribution along contact area when 5000 s

Fig.13 along the contact area

Fig.14 along the contact area

Tab.4 Separation finishing time (s) (models 1, 2, 3)

Fig.15 Temperature along contact area when 5000 s. (a) Model 4; (b) model 5

Fig.16 along the contact area. (a) Model 4; (b) model 5

Fig.17 along the contact area. (a) Model 4; (b) model 5

Fig.18 Thermal deformation of steel single cylinder model (magnification of displacement: 50 mm)

Fig.19 Thermal deformation of double cylinder model (magnification of displacement: 50 mm). (a) Model 4; (b) model 5

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