Improvement of the Wear Resistance of Engineering Machine Elements

Građevinski strojevi su izrazito čvrste i robusne konstrukcije, samim time velikih dimenzija i težina, kako bi udovoljili specifičnim zahtjevima velikih radnih učinaka te teških uvjeta rada. Građevinski strojevi često su izloženi kontinuiranom maksimalnom opterećenju u uvjetima terenskog rada, također u prisutnosti velikih količina vode, blata te svih klimatskih uvjeta što znatno utječe na intenzitet trošenja dijelova. Rad se sastoji od teorijskog i eksperimentalnog dijela. U teorijskom dijelu dan je pregled inženjerijskih strojeva te specifičnih opterećenja njihovih dijelova. Definirana je funkcija tih dijelova te njihovi konstrukcijski i tehnološki parametri. Napravljena je usporedba mehanizama trošenja te karakterizacija materijala odabranog dijela. U eksperimentalnom dijelu objašnjena je priprema tri različita ispitna uzoraka, izrađena od čeličnog materijala odabranih dijelova inženjerijskog stroja. Potom je provedeno metalografsko snimanje uzoraka, ispitana je tvrdoća materijala, snimljena površinska hrapavost i utvrđen kemijski sastav. Provedeno je ispitivanje otpornosti uzoraka na abrazijsko trošenje te je dan pregled svih rezultata ispitivanja.Construction machines are exceptionally solid and robust construction, and therefore large in size and weight to meet the specific requirements of high performance and heavy working conditions. Construction machinery is often exposed to continuous maximum load under field conditions, also in the presence of large amounts of water, mud and all climatic conditions, which significantly affects the wear of parts. The work consists of a theoretical and experimental part. In the theoretical part, there is an overview of the engineering machinery and specific loads of their parts. The function of these parts and their structural and technological parameters are defined. Comparison of wear mechanisms and characterization of the material of the selected part was made. In the experimental part, three different test samples are prepared, made of steel material of selected components of the engineering machine. Metalographic sampling was then performed, material hardness was tested, surface roughness was recorded and chemical composition determined. The abrasive wear resistance test was performed and a review of all test results was made and a conclusion was made