Analysis of Frame Strength in Coffee Bean Roasting Machines Using the Finite Element Method

Indonesian coffee production is a commodity in both domestic and international markets.The quality of coffee products is influenced by the degree of maturity of the coffee beans duringthe roasting process. To improve the quality of coffee beans from the roasting process, aroasting machine is needed to produce large coffee beans. The reliability of a coffee roastingmachine takes into account the strength of the machine frame to support the load of the systemcomponents and the mass of the coffee beans. Finite element analysis was used to model theframe of the coffee bean roasting machine using Solidwork 2021 Student Version software. Theframe of the coffee bean roasting machine is made of ASTM A36 material with a square hollowsection (30 mm × 30 mm) and a thickness of 1.2 mm. Meanwhile, the frame dimensions of thecoffee roasting machine are (1300 × 560 × 250) mm3. The research was conducted bydesigning and simulating a coffee roasting machine frame with different coffee bean massvariations to determine von Mises stress, displacement and safety factor. When the coffee beanmass fluctuates from 5 kg to 12.5 kg per 2.5 kg increase, the von Mesis stress on the frame ofthe coffee bean roasting machine is ~ 60 with a displacement value of ~ 0.8 mm. For a varietyof coffee beans, the frame of the coffee bean roasting machine is considered safe because thesafety factor value is ~5.