Patent GB-488612-A (GB)
Title: Process of and apparatus for conditioning metal bodies
IPC: B23K7/06
Filed: 1937-01-07
Abstract: 488,612. Cutting by fusion. LINDE AIR PRODUCTS CO. Jan. 7, 1937, No. 470. Convention date, July 11, 1936. [Class 83 (iv)] Rolling.-A metal billet &c. T before or between rolling has a stratum of its surface progressively removed by oblique streams of flame and oxidizing gas, the slag or molten metal being prevented from adhering by other blasts 32. The billet is then rolled without further heating. After de-surfacing one side, the work is turned over for treatment on the remaining side. The operator at P opens air control valve 100 to cylinder 82 so raising up a billet stopper 79 and slows down the motor of billet conveyer D to prevent shock when the billet touches the stopper 79. He then exhausts to atmosphere the air of bottom cylinder 82 and supplies air to the top to lower the billet stopper 79, and then shuts off air altogether. The valve 105 is then opened to supply water to cool the blowpipes B and nozzles N and valve 118 is opened to air cylinder 38 to move the blowpipecarrying slides 21 inwardly towards the vertical sides of the billet and start de-surfacing by air and oxygen blasts through the nozzles N. The billet may be heated before de-surfacing by a handle opening valves 122, 123 to deliver acetelyne &c. and oxygen and to the blowpipes B from pipe and manifolds 127, 131, and delivered through the passages 20 by the nozzles N. The jets of combustible gas ignite on striking the hot billet. The oxygen is delivered through the passage 19 of each nozzle N. When the de-surfacing is begun by opening the oxygen supply valve, the flow of blown off metal is kept off the top and bottom of the billet by a simultaneously opened blast supply valve 143 supplying air or oxygen or a mixture thereof to the perforated manifolds 32. The operator then operates the conveyer motor M to pass the billet from the conveyer D to the conveyer L so that each part of the billet sides is ignited and burned and blown away so removing a stratum therefrom the disposition of the nozzles forming shallow grooves in the billet sides. After de-surfacing the gases supply to the blowpipes B is shut off by handle 121, and air and oxygen is shut off from the slag clearing manifolds 32, and lever 117 is moved to supply air to cylinder 38 to move the slides 21 out, carrying the blowpipes B with them. The conveyer motor is then stopped and a guide 151 is moved in by water pressure through pipe 163 and then the guide 152 is similarly moved in so that hooks 166, operated by air cylinder 173 are raised to turn over the billet T and then are withdrawn. Guide 152 then pushes the billet against the guide 151, after which the guides are both moved away from the billet. The billet is then conveyed backwards past the de-surfacing nozzles to de-surface the remaining sides, after which the billet, while hot, is passed through a finishing rolling mill. If the billet is twisted or of irregular shape, guide feeler plates 67 bearing on the underside of the billet and other feelers 77, 78 bearing on the vertical sides transmit motion to the brackets 35 carrying the blowpipes B which are thereby automatically variably directed as the contour of the work varies. The blowpipe - carrying brackets are counterbalanced by a weight to facilitate their movement. Specifications 388,639, 447,751, and 459,290 are referred to.