METHOD OF MAKING A CROSS-RIFLED VAPOR GENERATING TUBE

A cross-rifled vapor generating tube is formed by rotating a smooth tube within a die at a first spiral lead angle to form a number of spiral grooves on the inside surface thereof and subsequently cold-drawing a number of grooves having a second spiral lead angle to thereby form a number of regularl...

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Bibliographische Detailangaben
Hauptverfasser:	TANAKA M,JA, NAKAMURA H,JA
Format:	Patent
Sprache:	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
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Beschreibung
Zusammenfassung:	A cross-rifled vapor generating tube is formed by rotating a smooth tube within a die at a first spiral lead angle to form a number of spiral grooves on the inside surface thereof and subsequently cold-drawing a number of grooves having a second spiral lead angle to thereby form a number of regularly spaced projections on the inside surface of the tube. The lead angles of the first and second spirally formed grooves are reversed with respect to one another and the sum of their angles equals 20 DEG -80 DEG . An improved generating tube is formed when the first and second spiral lead angles do not exceed 43 DEG . In a modified embodiment the second spiral lead angle is zero.