Mass production of small precision burners, more particularly preheating burners for liquid vapourising burners

摘要

708,453. Casting composite artictes ; making burner-nozzles. FRIGAST, E. P. L., [trading as FRIGAST & CO., E.]. Oct. 24, 1951, No. 24909/51. Classes 83 (1) and 83 (2) Cores. - Atomizing burners &c. required to have at least one accurate passage 2, up to a few tenths of a millimetre in width and about ten times this in length, are made by diecasting about a corresponding core. This may comprise a needle or a ground, drawn, or otherwise calibrated wire 7 mounted on one die part F. The other die part, not shown, has passages for a second core 8, which is withdrawn from the casting 1 as or before the die is opened, and for a fuel-supply pipe 5, which has a constriction 6 to fit the core To move the follower laterally away from the pattern, a valve 123 can be opened to supply full pressure to the normally-inoperative end of the cylinder 62, excessive pressure produced at the other end being relieved by the blow-off valve 108 and, to hold the cylinder in an intermediate position, full pressure to both ends of the cylinder can be supplied by opening the valve 123 and another valve 125. A valve 127 controls the supply of air to the bracket 24 for blowing away chips. 7 and is adjustable in the die to vary the length of the passage 2 produced. If desired the pipe 5 may be at an angle to the core 7. The molten metal may be forced into the mould.