Servicing aircraft engines sometimes requires manufacturing only a single piece of a given part. Manufacturing a turbine disc using traditional methods is uneconomical. It is necessary to use a different machining method recommended for small lot production. One of the proposed methods is WEDM (wire electrical discharge machining). The article presents the results of the research on finishing WEDM of Inconel 718 turbine disc fir tree slots. The influence of infeed, mean gap voltage, peak current, pulse off-time, and discharge energy on the shape accuracy, surface roughness, microcracks, and the white layer thickness were determined. Mathematical models were developed based on the DoE (Design of Experiment) analysis. The statistical significance of the models was verified with the ANOVA (Analysis of Variance) test. The machining parameters control methods that allow achieving the required shape accuracy, surface roughness, and surface layer condition were presented. The obtained surface roughness was Ra = 0.84 μm, the shape accuracy of the slot in the normal-to-feed direction was Δd = 0.009 μm, the profile shape accuracy was Δr = 0.033 μm, and the thickness of recast (white) layer was approximately 5 μm.
Streszczenie: Celem artykułu było porównanie dokładności zarysu ewolwentowego kół zębatych walcowych o zębach prostych, wykonanych przy programowaniu dialogowym na frezarce obwiedniowej CNC Koepfer 200 i programowaniu parametrycznym w systemie NX 9.0 na wieloosiowym centrum obróbkowym HSC 55 linear. Pomiary zarysów ewolwentowych powierzchni bocznych zębów wykonano na konturografie XC 20.Słowa kluczowe: zarys ewolwentowy, frezowanie obwiedniowe, frezowanie wieloosiowe, koło zębate walcowe, zęby proste
GEAR'S TOOTH PROFILE SHAPING IN DIALOG AND PARAMETRIC PROGRAMMINGSummary: The aim of this article was to compare the accuracy of involute profile of spur gears, manufactured by CNC hobbing machine Koepfer 200 with dialog programming and by multi-axis machining center HSC 55 linear with parametric programming in NX 9.0 system. Measurements of gears involute profiles were performed on contour system XC 20.
Wpływ kąta pochylenia krawędzi skrawającej frezu na proces odprowadzania wiórów ze strefy skrawania The influence of the cutting edge helix angle of the end milling cutter on the chips removal process (angle and velocity) from the cutting zone during high-performance milling of AlZn5.5MgCu aluminum alloy is presented.
The article presents the effect of electrode infeed in finishing machining of disk fir tree slots made of Inconel 718 alloy on shape accuracy and surface roughness in WEDM (wire electrical discharge machining).
Streszczenie: Celem artykułu było przeprowadzenie badań symulacyjnych odkształcenia struktury cienkościennej w systemie NX wykorzystując rozwiązanie nieliniowe. Przeprowadzono również badania doświadczalne obróbki HPC stopów aluminium w celu weryfikacji poprawności założonego rozwiązania MES.Słowa kluczowe: MES, HPC, cienka ścianka,
ANALYSIS OF DEFORMATION OF THIN-WALL IN NX IN HPC MACHININGSummary: The aim the article was to carry out simulation studies deformation of thin-walled structures NX system using non-linear solution. Experimental studies were also performed during the HPC aluminum alloys in order to verify the correctness of the assumed MES solutions.
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