Scana-Booforge is a Swedish company which specialize in heat treatment of various metal. The treatments take place in quenching ovens, where fans are used to circulate the hot air. The fans used today do not have a satisfactory lifespan. This thesis aims to develop a new design of the fans for the quenching ovens, and the goal is that the new fans will bring cost savings for Scana-Booforge. The design development process started with mapping out the environment in which the fans operate, and with analysis of the existing fan structure and damages, in order to establish the cause of failure and of short durability. The performance of the fan were also established at this stage. A specific cost index was developed to allow for comparison between the existing structure and the new design. The specific cost index is based on cost through lifespan. With knowledge of the existing fan performance it was then possible to set requirements for the new fan. Thereafter a number of concepts were generated. The concept that met the requirements best was then selected for further analysis, and optimization, in order to obtain an optimal design, regarding lifespan and capacity (that is the fans ability to circulate air). The developed design is composed of a lathed fan shaft and a twisted rotor blade. The components are joined together by welding. The rotor blade has a length of 600 mm, and thickness of 5 mm. It is twisted 45° in opposite directions at each end. The rotor blade weight is of about 2.6 kg, and together with the shaft the weigh is of about 20.8 kg. The new fan design meets the set requirements. In comparison to the existing fan the new design has an estimated lower cost per hour of operation, increased capacity and it retains the shaft dimensions for fitting to the existing driving shaft. By calculation, the cost saving is also established.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-176545 |
| Date | January 2012 |
| Creators | Kaya, Rabi |
| Publisher | Uppsala universitet, Institutionen för teknikvetenskaper |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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