METALLIC TUBE FOR HEAVY DRAWING PROCESS

PURPOSE: To easily remove a lubricating oil film without causing roughness to be caused on metal surface by setting the amount of calcium or the compound thereof adhering to the surface at a value equal to or less than the specified value, regarding a drawn metallic tube machined for a substantial c...

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Bibliographische Detailangaben
Hauptverfasser:	TSUZAKI YOSHINOBU, SATO MASAHIKO, YOKOCHI KATSUHIRO, NIWA MICHIHIKO, AOKI MASANOBU, TSUCHIYA AKINORI, KIJIMA HIROYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL BLASTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PIPES PUNCHING METAL SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE: To easily remove a lubricating oil film without causing roughness to be caused on metal surface by setting the amount of calcium or the compound thereof adhering to the surface at a value equal to or less than the specified value, regarding a drawn metallic tube machined for a substantial cross sectional area drop rate at the first drawing process. CONSTITUTION: The fracture of a tube material at a cold drawing process is attributable to calcium or the compound thereof adhering to the surface of the material. Regarding a metallic tube for the heavy drawing process where a cross sectional area drop rate is equal to 30% or more at the first drawing process, therefore, calcium or the compound thereof adhering to the surface of the tube is set at 0.005mg/dm or less on an average. For this purpose, ion exchange water is used as cooling water, or a surface polishing and grinding process is provided as a machining process after cooling a hot drawn tube. Also, the deposition depth of calcium or the compound thereof is kept at 10μm or less from the outermost tube surface, thereby further preventing a drawn fracture.