NIOSHTIC-2 Publications Search
Fixture for forming evaporative pattern (EPC) process patterns.
Turner PC; Jordan RR; Hansen JS
US Pat 5,265,664 1993 Nov; :1-9
A method of casting metal using evaporative pattern casting process patterns in combination with a fixture for creating and maintaining a desired configuration in flexible patterns. A pattern is constructed and gently bent to the curvature of a suitable fixture. String or thin wire, which burns off during casting, is used to tie the pattern to the fixture. The fixture with pattern is dipped in a commercially available refractory wash to prevent metal adherence and sticking to the fixture. When the refractory wash is dry, the fixture and pattern are placed in a flask, and sand is added and compacted by vibration. The pattern remains in position, restrained by the fixture. Metal that is poured directly into the pattern replaces the pattern exactly but does not contact or weld to the fixture due to the protective refractory layer. When solid, the casting is easily separated from the fixture. The fixture can be cleaned for reuse in conventional casting cleaning equipment.
Metals; Metallurgical processes; Metallurgy; Equipment design
United States Patent 5,265,664
Page last reviewed: October 22, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division