Apparatus for producing a tube with successive corrugations

US4237713A · kind A · utility

Assignee

• Benteler-Werke AG · DE

Inventors

• Hubertus Benteler · Bielefeld, DE
• Egon Olszewski · Paderborn, DE
• Rainer Hansen · Paderborn, DE
• Ferdinand Wecker · Hövelhof, DE

Key dates

• Filing date: May 18, 1979
• Grant date: Dec 9, 1980
• Expiry date: May 18, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S297/90
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Apparatus for producing a tube with successive corrugations from a tubular blank of constant diameter comprises a central pin having a shaft portion fixed only at one end to a stationary support and having at the other end a radially enlarged head portion cooperating with radially inwardly moving clamping and forming jaws to clamp a portion of a tubular blank therebetween. The apparatus includes further a tubular member guided on the shaft portion of the central pin and movable in axial direction by hydraulically operated members connected thereto. The tubular member supporting a blank on the inner surface thereof and cooperating with a plurality of clamping fingers arranged axially spaced from said head portion about the outer circumference of the blank and movable by a hydraulically operated clamping piston between a clamping and a releasing position, whereby between the head portion, one end of the tubular member and the clamped portions of the blank an annular expansion chamber is formed into which fluid under pressure may be fed through bores in the central pin.