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Dynamic evaluation of a two-dimensional turning operation and analysis of a tool holder shank
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The turning process is one of the most important manufacturing processes in the industry today. A large portion of the manufacturing operations in the world consists of machining metal to size and shape. To be competitive, it is important that the machining operation is as cost-efficient as possible. This requires a good knowledge of metals, cutting tools and the machining conditions and processes. There must be an economical balance between cutting tool life, productivity and surface finish to produce the highest quality parts in the shortest period of time. This can only be achieved if we use competitive tools and machining processes. In the turning operation the relative dynamic motion between the cutting tool and the workpiece is a frequent problem, which affects the result of the machining and in particular the surface finish. Noise in the working environment frequently occurs as a result of the interaction between the cutting tool and the workpiece. With proper machine design i.e. improve the dynamic stiffness of the machine structure, the problem may be partially solved. One way to reduce the dynamic motion between the cutting tool and the workpiece is to use actuators. A theoretical dynamic model for a two-dimensional orthogonal turning operation was established. The dynamic motion between the cutting tool and the workpiece was examined. A two-dimensional program was written in Matlab to simulate the turning operation. The established turning model can be used to get a better understanding of the interaction between the cutting tool and the workpiece during a turning operation. Depending on factors as workpiece material, geometry, cutting data, boundary conditions the finish of the machined surface will vary. This variation will also affect the actual dynamic chip thickness, cutting forces and motion of the workpiece during the turning operation. The thesis also considers how to establish a finite element model that gives a good understanding of the modal properties for a tool holder shank. The dynamic characteristics of a tool holder shank were determined by using the Finite Element Method. Experimental measurements i.e. Experimental Modal Analyses were done resulting in the dynamic characteristics of the tool holder shank. Results from the experiments were compared with results from the FE-calculations.

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-50073ISRN: LTU-EX--04/014--SELocal ID: 75cbd9ed-711a-4a2b-92c7-656a2f0e556fOAI: diva2:1023428
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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