Tube with grooves on inner surface and its manufacturing method, and fluted plug

The invention provides a tube with grooves formed in an inner surface thereof, a method of producing the tube and a grooved plug. The tube having grooves formed in its inner surface. The grooves are formed in a reverse trapezoidal cross section, and the corners at the root of each groove have a circ...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KAWASAKI HIROSHI, SAWARA NOBUHIRO
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL BLASTING DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION HEAT EXCHANGE IN GENERAL HEATING LIGHTING MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WEAPONS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	The invention provides a tube with grooves formed in an inner surface thereof, a method of producing the tube and a grooved plug. The tube having grooves formed in its inner surface. The grooves are formed in a reverse trapezoidal cross section, and the corners at the root of each groove have a circular arc shape and the ratio (R/delta) of the radius R (mm) of each corner to the width delta (mm) of the groove is not less than 0.10 and not more than 0.25. A grooved plug having ridges and grooves formed on the outer peripheral surface of the plug is inserted into a blank tube, and the outer peripheral surface of the blank tube is pressed. This causes a blank tube material to flow into the grooves of the plug to form grooves in the inner surface of the blank tube. In this process, the blank tube material can easily flow into the grooves of the plug, so that cracks of the grooves and fins can be prevented.