This paper proposes a practical, efficient shrinking fitting system that requires low initial implementation costs as well as minimal operation or maintenance costs. Executive Summary The proposed procedure will employ the phenomenon of thermal expansion in the make strong joints. The technique particularly involves using liquid nitrogen as the preferred cryogenic fluid for compression shrink fitting. Numerous literatures reveal that the conventional heat and fitting techniques often consume a lot of time, are costly to operate and can also lead to significant mechanical damage due to stress resulting from uneven or poor heating procedures. This paper proposes an alternative shrink fitting system that: Is cost effective Does not damage the components Has a low capital cost Efficient Among all the cryogenic fluids reviewed such as helium, hydrogen fluid is the most applicable in this project. Although there are several cryogens that are currently available for use in compression shrink fitting, liquid nitrogen is one of the cheapest and most common of them and can be legally purchased in nearly every part of the world. Lastly, if it succeeds, the proposed project will ill particularly find a wide range of applications not only in the metal working industry but also in various other mechanical and constructional fields such as automotive and building industries. Table of Contents One of the major challenges of metal systems is the tendency of various metal components to expand when heated and contract when cooled. The conventional approaches used to mitigate this problem involve heating the out components before assembly to allow it expands so that the inner component can be effectively fitted into it. However, these techniques often consume a lot of time, are costly to operate and can also lead to significant mechanical damage due to stress resulting from uneven or poor heating procedures. Contrastingly, the use of liquid nitrogen shrinking is more efficient, faster and can significantly help eliminate the potential distortions of components. This paper proposes a practical, efficient shrinking fitting system that requires low initial implementation costs as well as minimal operation or maintenance costs. 1 1.Problem Statement 4 Metals normally have a tendency to contract when cooled and expand when heated. This property is a major limitation in most mechanical systems because it may result in a significant difference between the inner and outer dimensions of mechanical components. One of the most widely solutions is shrinking fitting in which components of a structure may be pre-heated or cooled, based on the phenomenon of thermal expansion, to fit them together. Traditionally, various heated metal systems are usually used to resize one of the fitting components. However, both the force fit and expanding the outer components techniques are not only costly to operate but can also lead to significant mechanical damage due to stress resulting from uneven or poor heating procedures. On the other hand, heating the outer component may sometimes take longer time and may be hindered by the metallurgical properties of the components. 4 According to Heinz, P. (2008), liquid nitrogen shrinking fitting is one of the most cost effective and safest methods that can be invariably used as
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Liquid Nitrogen Shrink Fitting Box [Name] [Institution] Abstract One of the major challenges of metal systems is the tendency of various metal components to expand when heated and contract when cooled. The conventional approaches used to mitigate this problem involve heating the out components before assembly to allow it expands so that the inner component can be effectively fitted into it…
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