This report is a degree project for a Bachelor of Science degree with specialization in mechanical engineering MSGC17 at Karlstad University. It’s made by a graduate engineering student specializing in mechanical engineering MSGC17 at Karlstad University. The work was carried out at voestalpine Precision Strip AB in Munkfors. Voestalpine Precision Strip AB is a company where they roll precision steels. To one of their products, an abrasion-resistant coating is ground to get the desired shape to the customer. The purpose of this work is to investigate the formation of residual stresses in the coating when the coating has been ground. The aim of the work is to optimize the parameters in the grinding machine so that the residual stresses are reduced and deliver a grinding recipe with recommendations for voestalpine. The method that was used to investigate the influence of the parameters was to make a design of experiments (DOE) on the process. By doing this, different parameters could be tested in high and low value simultaneously on one and the same band. 5 parameters were examined which were considered to affect residual stress formation. The factorial design was a 2 5−2 factorial design. The tests were carried out in 8 different variations where the parameters were run in low or high level. After grinding, the residual stresses in the material were measured with X-ray diffraction to obtain values for residual stresses. The X-ray diffraction measured the residual stresses in 3 different directions. With the stresses in the three different directions, the main stresses were also calculated. The result showed that parameter B is a recurring parameter in all trial planning, and it should be at a high level. In the grinding recipe voestalpine wanted will A and C run as much they’re required too, B at high level, D at low level and parameter E at a high level. With this recipe the residual stresses are theoretically reduced in the material.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kau-72664 |
| Date | January 2019 |
| Creators | Johansson, Casper |
| 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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