Bending method for shaped material

Abstract

Abstract PURPOSE:To prevent the inner surface of a shaped material from the generation of wave-shaped deformation, and to easily extract a mandrel device without causing its failure, by inserting a flexible band-plate between the mandrel device and the material to be worked, in a bending work by inserting the mandrel device into the inside of shaped part of the material to be worked. CONSTITUTION:In forming a seat-belt guide 1 having a groove 2 used for motor cars, for instance, a linear shaped-material having the groove 2 is formed by extrusion, etc. to be prepared as a material 6 to be worked. On the other hand, a flexible mandrel is constituted of numbers of mandrel pieces 3 having respectively the same cross-sectional shapes as that of the groove 2, by inserting a connecting plate 5 into through holes 4 pierced in the upper parts of repective pieces 3 and fixing them by a stopper 7 formed at the end of the plate 5. Next, the flexible mandrel is inserted into the groove 2 of the material 6, and a flexible band-plate 8 is also inserted between them. The material 6 is inserted to the recessed part of a bending die 10 of a rotary bender and is bent by pressing it with the aid of a press roll 9, and then the plate 8 is extracted after said bending and successively, the pieces 3 are extracted together with the plate 5 to obtain the guide 1.

Inventors

• 👤 Masao Matsui
• 👤 松居　正夫
• 👤 Hideoki Fukushima
• 👤 英沖 福島
• 👤 Masami Ishii
• 👤 石井　正己
• 👤 Akito Isomura
• 👤 磯村　秋人

Bibliographic Details