DC Comics loved a good robot cover. There was usually one of two themes: either gigantic, killer machines or duplicitous copies that needed to be revealed. Occasionally we got a mad scientist on trial as well. I skipped all the Batman, Superman and Wonder Woman where they had an exact robot duplicate. No gears or giant pinchers there, just another copy of the hero.
The Silver Age of Robots seemed to peak around 1964. DC produced a few series featuring robot heroes including Metal Men, The Doom Patrol and “The War That Time Forgot” in Star Spangled War Stories. The House of Mystery featured “Robbie the Robot” for years but he never got any covers.
