JPS55136520A - Bending method for taper pipe - Google Patents

Abstract

PURPOSE: To bend the taper pipe into the aim angle, by inserting the taper pipe, being inserted with the core material made of elastic material, into the space between the two segmented lower dies provided with the taper face being possible to hook under the press and the upper die provided with the fitting groove formed into the aim bending angle, and by pressing the taper pipe with the upper die while forcibly pushing the core material.

CONSTITUTION: The lower dies 8a, 8b, are set on the base 10 so as to be turnable around the pin 12 born by the bearing 11, and another ends of these lower dies 8a, 8b, are supported by the coushions 13a, 13b; besides, the fitting grooves 9a, 9b, are formed in the lower dies 8a, 8b, so as to incline identically with the taper of the taper pipe 7. The upper die 5, provided with the groove 6a of the same shape as the bending angle of the taper pipe 7, is placed above the lower dies 8a, 8b. The core material 1 is formed by winding the plastic material 4 around the bone 2 like at the chain, etc.; this core material 1 is inserted into the taper pipe 7 and is forcibly pressed by the piston 15 and is fed into the space between the upper and lower dies' grooves 5, 9a, 9b; under this condition, the taper pipe 7 is pressed by the upper die 5. The taper pipe 7 is bent into the same shape at the shape of the groove 6a; and the lower dies 8a, 8b, smash the cushions 13a, 13b, and form the hook. Hereby, the taper pipe 7 is bent into the aim angle, and then, the core material 1 is taken away.

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