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Investigation of cutting edge movement in finish milling with indexable end-mills
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This master thesis has been performed on and written at Sandvik Coromant in Sandviken which is a division of Sandvik AB. Sandvik AB is an engineering industry with focus on high technology and the companies turn over for 2004 were 7 billion USD. The business is located in 130 different countries and has an estimated number of 38 000 employees all over the world. This master thesis is a continuance of a previously conducted thesis made by Petter Stenmark. The purpose of the this project were to investigate the factors that affect the form error in finishing milling with insert mills and present effective ways of decreasing these errors. Seven different variables has been investigated in this thesis and these are: • Axial rake angle • Feed per tooth • Radius of cutting edge • Young’s modulus • Mass distribution • Workpiece material • Milling machines A increase in axial rake angle has, through simulations, calculations and experiments with solid mills, been verified to decrees the form error which was one of the conclusion Stenmark had made. No conclusions could, however, be made regarding the percentile reduction of the form error the axial rake angle had. The influence of the feed and the radius of the cutting edge showed to be somewhat linked to each other. An increase of cutting feed did not necessarily increase the normal force Fy that controls the magnitude of the deflection to the presumed levels. This had a lot to do with the relation between the edge radius and the chip thickness. If the edge radius were very large would the divergens between a feed 0.1 and 0.3 mm not effect the form error very much. The next two variables, which are Young’s modulus and mass distribution, are also linked to each other. Many prototype cutters in different material were produced and experimented with so that different material related calculations could be verified. The result form these experiments and calculations were that the cutter shaft stiffens was secondary while the mass location had larger importance on the form error. Different materials have different machine ability. For tougher materials larger cutting forces are required to cut a chip. The workpiece material will because of this influence the form error. The selection of milling machine is one of the most influential parameter that governs the form error. Different machines have different dynamic characteristics because of variation in bearing diameter and positions, mass distribution in the spindle and so on and the variations in form error as a result of these characteristics showed to be large.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Machining
Keyword [sv]
URN: urn:nbn:se:ltu:diva-48440ISRN: LTU-EX--05/313--SELocal ID: 5e4f273a-a2a6-4952-a7af-08417f3f212aOAI: diva2:1021782
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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