How can I improve the metal surface if there is little or no initial friction at the point where the bell hammer is used? Is there any effect if the surface temperature is raised beforehand?

Initial friction is a very small amount of friction, but it is possible to change the composition of the metal surface.
Therefore, even if there is no metal-to-metal contact (e.g., resin-to-metal or rubber-to-metal), frictional resistance must be generated, and techniques that increase surface temperature in advance are unlikely to be effective.