Testiranje PVD prevlek pri preoblikovanju v stiskalnici

Marzelj, Vid (author), Kalin, Mitjan (mentor)

Za slovensko orodjarno smo preizkušali različne PVD prevleke na avtomobilskem orodju v ekscentrični stiskalnici. Izdelali smo upogibni vložek, ki se mu je dodelalo šest manjših vložkov. Ti manjši vložki se nahajajo pri aplikaciji vleka na najbolj obremenjenem mestu. To mesto je obremenjeno zaradi viška materiala pri preoblikovancu. Pri vleku oziroma upogibu izdelka nastane guba, ki močno pritiska na vložek, kar je posledica hitre obrabe prevleke. Manjše vložke smo skonstruirali tako, da ima na mestu gube poglobitev, sprostitev, da izdelek ne pritiska preveč. Za testiranje se bo uporabilo pet različnih nanosov, eden brez. Vsak posamezen vložek je bil testiran z enakim številom ciklov. Testiralo se bo na serijski proizvodnji v stiskalnici. Po določenem številu ciklov se bo vložek zamenjal in odnesel na analizo, kjer se bo spremljala površina in obraba prevleke. Z vsakim testnim vložkom smo opravili določeno število ciklov. Rezultate smo sprva pokomentirali ločeno, glede na menjave vložkov. Na koncu smo izvedli primerjavo vseh debelin prevlek in ciklov, oziroma število izdelanih kosov. Ugotovili smo, da se pri preoblikovanju trdih oziroma pločevin z visokimi nateznimi trdnostmi, tri PVD prevleke izkazujejo dobre proti obrabne lastnosti.

• Language: Slovenian
• Keywords: PVD prevleke, pločevina, stiskalnice, obraba, preoblikovanje, odpornost
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [V. Marzelj]
• Year: 2019
• Number of pages: XV, 60 f.
• PID: 20.500.12556/RUL-109967
• UDC: 621.793.7:621.98(043.2)
• COBISS.SI-ID: 16935707
• Publication date in RUL: 11.09.2019

Secondary language

• Language: English
• Title: Testing PVD coatings in transforming at the press

Abstract

For Slovenian tool repair workshop we were testing different PVD coatings on car tools in an eccentric press. We have made a bendable test specimen with aditional six smaller specimens. The smaller ones are located at the point of the highest pulling load. This load point is a result of surplus of material on the specimen. Pulling or bending of the final product results in wrinkles that apply high pressure on the specimen, which causes faster wear and tear of the coating. The smaller specimes were designed with an indentation where the wrinkle appears to release and reduce the pressure. Five different coatings will be used for the testing and one specimen will have no coating. Each seperate specimen will be tested with the same number of cycles. The testing will be conducted on a serial production press. After a certain number of cycles the specimen will be replaced and taken for analysis where the coating wear and tear will be monitored. Every test specimen was subjected to a certain number of cycles. The results were discused separately based on the specimens. At the end we created a diagram where all of the coating thicknesses and number of cycles or number of specimen made. We are able to guarantee that after transforming of rigid or high tensile strength metal sheets, there are three PVD coatings that are able to withstand the test.

• Keywords: PVD coatings, sheet metal, presses, wear, transformation, resistance