The aim of the research was to analyze the delivered profile samples, where appeared the darker spots with an irregular circular shape on the surface of light colored profiles after process of natural anodizing without colouration. Profiles are manufactured with alloy EN AW 6060 (AlMgSi) according to EN 573-3, which was carried out by heat treatment hardening. For material were performed measurements of Brinell and Vickers hardness, Vickers microhardness and substructural analysis in occurrence area of the dark spots and outside of these spots (light area of profile). Based on these analyzes it revealed significant difference of mechanical properties in these individual areas and different substructure of the solid solution α there. Based on knowledge of heat treatment technology is this substructure heterogeneity and diversity of mechanical properties (hardness and micro-hardness) of the given alloy caused by uneven localized cooling after solvent annealing in the hardening process. The occurrence of inhomogeneities is then right to express to different color profile to the surface after the anodizing process.
Grinding is still an important method for surface finishing. At FPTM JEPU research, which deals with this issue is conducted. Experiments are carried out with grinding various materials under different conditions and then selected components of the surface integrity are evaluated. They include roughness Ra, Rm and Rz, Material ratio curve (Abbott Firestone curve) and also the obtained roundness. This article deals with grinding nickel Inconel 718 alloy, when selected cutting grinding conditions were used and subsequently the surface profile and the material ratio curve were measured and evaluated.
There are a number of methods for measuring propeller pitch, but there could still be problems for many fishing boat builders because of their lack of necessary professional equipment. This paper presents a method of propeller pitch measuring based on photogrammetry and CAD (Computer-Aided Design). This method consists of three stages. The first stage is to take a series of 2D image photographs of the propeller using a smart phone. The second stage consists of processing these 2D images using photogrammetry software to create a 3D virtual model of the propeller. A CAD program is used to measure the pitch at different radii of each blade of the 3D virtual model in the third stage. In this study, several propellers for fishing boats were measured and the results were compared to those archived by using an EDM (Electrical Discharge Machining) machine and by a qualified professional worker using simple tools. The measurement results showed that the proposed method would be acceptable for measuring pitches of propellers of fishing boats.
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