Method and device for producing bellows

A device for reforming a bellows for use in a heated atmosphere, said bellows being a metal pipe having a plurality of bulges formed therearound, said device comprising:

• a base member;
• a first clamp device fixedly mounted on said base member, said first clamp device having a first hydraulically actuated clamping means which clamps one tubular end of said bellows when actuated;
• a second clamp device movably mounted on said base member, said second clamp device having a second hydraulically actuated clamping means which clamps the other tubular end of said bellows when actuated;
• a hydraulic power source which hydraulically actuates said first and second hydraulically actuated clamping means when assuming ON condition;
• and
• an electric moving device which moves said second clamp device toward and away form said first clamp device when electrically energized,
• wherein each of said first and second hydraulically actuated clamping means comprises:
• a hydraulic actuator having an output plunger, said output plunger having a tapered leading end;
• a tubular housing in which said output plunger is axially movably received;
• a plurality of clamp pieces installed in said tubular housing in a manner to surround the tapered leading end of said output plunger, each clamp piece having a tapered inner surface which can mate the tapered end of said plunger;
• an O-ring received in an annular groove which is formed in the clamp pieces;
• supporting members installed in said tubular housing in a manner to surround a major portion of said output plunger, each supporting member supporting one end of the corresponding clamp piece;
• and
• a circular cap installed in said tubular housing and put on the clamp pieces.