Cold sizing

Abstract: PURPOSE: To improve the mass productivity and accuracy of a product by forming a tooth profile part by its forging from a heated blank, then executing warm sizing in forged preheating state and after nonoxidizing normalizing and shot stages executing cold sizing. CONSTITUTION: A beveling part is formed with cold forging 5 on the blank 4a subjected to bonderiging in advance and heated at the specified temp. to execute warm side forging 7. Piercing and sizing 8 are then executed simultaneously at warm temp. with the remaining heat state of 600W850°C on the bevel gear 7a forming a tooth profile part 7b. And after executing a nonoxidizing normalizing 9 and shot 10 on a bevel gear 8a a product gear 11a is formed with cold sizing 11. Since the cold sizing 1 is executed once again after the warm sizing 7 the forming is reasonably executed. The mass productivity and accuracy of a produce are therefore improved. COPYRIGHT: (C)1988,JPO&Japio

Abstract: A method and apparatus (12) for cold sizing a round workpiece (14) having round surfaces of cylindrical shapes that are coaxial about a central axis A of the workpiece and have different diameters. A support (54,55) rotatably mounts the workpiece (14) about its central axis A between a pair of die assemblies (24a, 24b) which are spaced from each other. Each die assembly (24a,24b) includes a plurality of dies (56,58,60,62) that are respectively aligned with the round surfaces (46,48,50,52) of the workpiece (14). Movement of the die assemblies in opposite directions as each other engages sizing surfaces (66,68,70,72) of the dies with the aligned round surfaces of the workpiece to pressure size the workpiece surfaces. In one embodiment of the sizing apparatus (12), the die assemblies (24a, 24b) have elongated shapes and are moved rectilinearly in a parallel relationship to each other to perform the sizing. Another rotary embodiment of the sizing apparatus (12') includes rotary die assemblies (24a',24 b') mounted by associated spindles (85) whose rotation likewise pressure sizes the round workpiece surfaces. Both embodiments of the sizing apparatus are disclosed as including forming productions for forming projections such as splines (82) and/or a helical thread (84) on the sized surfaces of the workpiece.

Abstract: The invention relates to a process for carrying out cold rolling on a moving blade and a stationary blade of a GH150 alloy high-pressure compressor The process comprises a flow of a predominant process and a heat-treatment process: a semi-precision forging piece is subjected to solid solution and oil cooling; subsequently, a rabbet is machined and a root part of a blade body is milled; subsequently, the blade body is leveled and is subjected to primary cold rolling, argon charging and cold solid solution treatment in vacuum and secondary cold rolling till the blade body is rolled to have no residue; the blade body is charged with argon in a vacuum furnace and is subjected to the treatment of cold solid solution and cold sizing; and the rabbet and the gas inlet and exhaust edge of the blade body are subjected to polishing, fine machining, primary aging in the vacuum furnace, argon protection, secondary aging treatment and vibrating burnishing The process has the advantages that engineering application research on a cold rolling technology of the blade is carried out, successfully working blades and rectifying blades with thirteen levels of the high-pressure compressor of an engine are developed; and the blade passes a cyclic vibration fatigue test under specified load and a long-term trial-run test of the engine