Vliv vlastnosti reznych kapalin na prubeh procesu obrabeni v opravarenskych technologiich zemedelske techniky.

The aim of the presented thesis was to compare metalworking fluids of different physically-chemical structure, used for the cooling and lubrication during the grinding process. Autor focused on the following types of experiments: A) The influence of metalworking fluids on the roughness of the finished surfaces of the steel specimens. B) The influence of metalworking fluids on the microhardness of the finished surfaces of the steel specimens. C) The influence of metalworking fluids on the anticorrosion resistance of the finished surfaces of the steel specimens. Level specimens (steel class 11 373, 14 260.3, 14 260.1 and 14 260.7) were polished by grinder BPH 20 with grinding wheel A98 32K9 V01. The turning of the grinding wheel was 2800 min-1. The thickness of taken material was 0,3 mm. The metalworking fluids used during the grinding process had the following physicaly-chemical structures: Bitol 1 is a unary fluid with refined vegetable oil; Cimstar 450 is a semi-synthetic metalworking fluid; Ecocool 68 CF 2 is a semi-synthetic metalworking fluid; KS Fluid U is a fluid with a mineral oil; Parasol SK 200 is a synthetic water solution. Autor used the apparatus Surftest SJ - 201 for measuring the exact values of roughness Ra (median arithmetic deviation of profile), Rq (median quadratic deviation of profile) and Rm (maximal depth of roughness). The microhardness was measured by Hanneman's durometer. There were measured 100 values of every parameter of roughness and microhardness; later there were ignored the 5 highest and the 5 lowest values and the remaining 90 values were statistically coupled with software Maple V-3. The anticorrosion protection by metalworking fluids was tested in a condensation chamber (t = 36 C, 100% relative humidity, distilled water) until the first indication of corrosion. Author even used specimens without application of any metalworking fluid during this measuring.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi