A: The maintenance frequency of a gold bar casting machine depends on several factors, such as its usage intensity, the quality of materials processed, and the manufacturer's recommendations. Generally, for a machine in regular operation, it is advisable to conduct a comprehensive inspection and maintenance at least once every three to six months. This includes checking the heating elements, lubricating moving parts, inspecting the mold for wear and tear, and ensuring the accuracy of temperature control and other components. Additionally, daily or weekly visual inspections and minor maintenance tasks like cleaning and removing debris should be carried out to ensure the smooth operation of the machine.