| 摘要 |
<p>A bushing assembly (10) through which molten glass (14) is extruded to form fiberglass filaments (12) includes a bushing panel (22) defining an extrusion face (32). Molten glass flows through the bushing panel (22) of the extrusion face (32). The extrusion face (32) has a plurality of integrally formed tips (46). The bushing panel (22) is heated by ceramic heater blocks (42) having resistance heating elements (64) encased in slots (62). A frame (20) holds the bushing assembly (10) including the bushing panel (22) and heater blocks (42) on an orifice block (18) of a forehearth (16). Cooling fins (50) and cooling tubes (52) are attached to the bushing assembly to cool the tips (48) and fiberglass filaments (12) after extrusion. Methods of making the bushing and bushing assembly (10) are also disclosed including the steps of hydroforming the bushing panel (22), punching a plurality of holes (48) in the extrusion face (32), forming tips (48) on each hole and machining the tips (48) to a uniform length. The bushing assembly method also includes the steps of attaching ceramic heater blocks (42) and cooling means (50, 52) with a frame (20) onto the orifice block (18) of a forehearth (16).</p> |
