PRODUCTION OF INTERNAL GEAR

PURPOSE:To improve a yield of material, to increase a strength of an internal gear and to improve the workability. CONSTITUTION:A metal plate 24 as a blank of a frame is punched and a waste hole 26 is formed. On a circumferential part of the waste hole 26, the metal plate 24 is pressed and a 1st ord...

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Bibliographische Detailangaben
Hauptverfasser:	SAKAGUCHI YOSHIHIDE, HATTORI ICHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PURPOSE:To improve a yield of material, to increase a strength of an internal gear and to improve the workability. CONSTITUTION:A metal plate 24 as a blank of a frame is punched and a waste hole 26 is formed. On a circumferential part of the waste hole 26, the metal plate 24 is pressed and a 1st order cylindrical part with a bottom whose bottom wall has the waste hole 26 is formed. A R-corner part of the bottom side of the 1st order cylindrical part is reduced, the circumferential wall is formed so as to be made straight and a 2nd cylindrical part is obtained. Ant internal gear is preliminarily formed on an internal surface of the circumferential wall of the 2nd order cylindrical part and a 3rd cylindrical part is obtained, further, the internal gear 20 is really formed and a 4th order cylindrical part 56 is obtained. The cylindrical part is formed with drawing (including bulging) due to mainly the material flow from the internal side of the metal plate 24, that is, from the circumferential periphery of the waste hole 26 outward the radiant direction.