1) Hammer metal 2) Toughen metal by hammering 
to polish; to flatten
• (v.) To make smooth or plane, as a metallic surface; to condense, toughen, and polish by light blows with a hammer.
Plan'ish transitive verb [ imperfect & past participle Planished ; present participle & verbal noun Planishing .] [ Old French planir , French planer . See Plane , v. , and -ish .] To...