勘探队在建厂房的时候,往往要用许多螺丝杆。过去我们都是用手拿着一端烧红的铁筋往砧上镦,这样不仅浪费工时,效率低,同时还消耗体力。为此,我们制造了一种专用镦床,不仅节省了人力,同时效 When the exploration team builds the factory, it often takes many screw rods. In the past, we all used our hands to hold red-hot iron on the anvil upside-down, which not only wastes man-hours but is inefficient and consumes physical energy at the same time. To this end, we have created a special upsetting bed, not only saving manpower, while effective