Can external threads be die cast, without secondary operations?
A. In many parts, external threads can be die cast on cylindrical features. The threads can be formed across the parting line of dies, with either slides or with solid die components. When threads are formed across the parting line, or when slides are used, some flash is usually left in the threads, and this is difficult to remove. If the flash is not severe, and if conditions of assembly and use permit, the first installation of the nut can serve as a flash removal operation. It is also possible, if some thread strength can be sacrificed, to cast “flats” on the parting line at the root of the threads. The flash is formed on the flats where it is easily trimmed off.
