Bending liquid pressure forming method for thin-walled tube

Abstract

Abstract PURPOSE: To form the deformed section bending tube in a body having no asymmetrical deformation, by pressing the upper and lower metal die having deformed section loading axis direction tensile force of less than yield point and inner pressure on thin-walled round tube and carrying out bending processing and then, carrying out high pressure formation maintaining the above mold in a body. CONSTITUTION: The material tube 2 is placed on the lower die 5 in the state of rising up the upper die 1 and the loading apparatus 11 is equipped on both ends of the tube 2. The rod 7 is moved in the arrow mark direction sucking the oil in one hand side of the hydraulic cylinder 6 and the tensile force 6 is loaded on the tube 2. Air in the tube 2 is drawn out in the above condition and the pressure P 1 is loaded on the tube using pressure oil etc. Next, bending formation of the tube 2 is carried out descending the die 1. Both dies are maintained in the condition making the die 1 and 5 in a body after finished the bending formation and higher pressure P 2 than the pressure P 1 is loaded. The tube 2 is projected tightly by the above pressure in the space formed by the dies 1, 5 and the processing is completed. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Hiroshi Asao
• 👤 Kenichi Okada
• 👤 Shinobu Watanabe

Bibliographic Details