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- Adolfsson, C, et al.
(författare)
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Cutting force model for multi-toothed cutting processes and force measurement equipment for face milling
- 1995
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Ingår i: International Journal of Machine Tools & Manufacture. - 0890-6955. ; 35:12, s. 1715-1728
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Tidskriftsartikel (refereegranskat)abstract
- This article presents a mechanical cutting force model for multi-tooth cutting processes, where initial position errors in radial and axial direction, eccentricity and edge wear are taken into account. The cutting forces are presented for each individual cutting edge, and in a system of coordinates where one axis is parallel to the cutting speed vector at any instant. The process parameter cutting resistance, Cr is derived from the measured main cutting force FM. Cr should be regarded as a parameter since it is always increasing with decreasing values of theoretical chip thickness h1. A new way of measuring cutting forces in multi-tooth cutting processes is also presented. Eight cutting force components are measured on the tool close to each of the four cutting edges. The aroused signals are filtered, amplified, A/D-converted and put together in a serial stream for transmission through a hollow spindle via a fibre optic cable. The signals are sent from the rotating spindle to the frame of the machine over an air gap with Light Emitting Diodes. They are then demultiplexed, D/A-converted, and stored in a PC-based eight channel oscilloscope. With this measurement equipment it is possible to directly measure the cutting forces acting on each individual cutting edge.
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| 5. |
- Johansson, Emil, et al.
(författare)
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Influence of Resin Composition on the Defect Formation in Alumina Manufactured by Stereolithography
- 2017
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Ingår i: Materials. - : MDPI AG. - 1996-1944. ; 10:2
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Tidskriftsartikel (refereegranskat)abstract
- Stereolithography (SL) is a technique allowing additive manufacturing of complex ceramic parts by selective photopolymerization of a photocurable suspension containing photocurable monomer, photoinitiator, and a ceramic powder. The manufactured three-dimensional object is cleaned and converted into a dense ceramic part by thermal debinding of the polymer network and subsequent sintering. The debinding is the most critical and time-consuming step, and often the source of cracks. In this study, photocurable alumina suspensions have been developed, and the influence of resin composition on defect formation has been investigated. The suspensions were characterized in terms of rheology and curing behaviour, and cross-sections of sintered specimens manufactured by SL were evaluated by SEM. It was found that the addition of a non-reactive component to the photocurable resin reduced polymerization shrinkage and altered the thermal decomposition of the polymer matrix, which led to a reduction in both delamination and intra-laminar cracks. Using a non-reactive component that decomposed rather than evaporated led to less residual porosity.
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