| 摘要 |
PURPOSE:To cold-press the titled bolt in good shape with high efficiency by forming with swaging in taper shape at the tip the blank of regular sized shaft diameter to be fed in the state of engaging both ends in the space composed by the abutting first die and first punch and by forming the head part with the second die and second punch with hexagonal pin. CONSTITUTION:The blank (a) of stopper abutting regular-sized butt shaft diameter is provided with shearing by a cutter 7 and transferred to the first station by being held to a feeding device 53 with an ejection pin 52. The first punch 28 energized by a spring 23 is abutted to the first die 8 with the advance of a punch holder 16 and holds with fitting the both ends of a blank (b). The space composed by the first punch 28 and first die 8 is composed by the taper part 12 of 30 deg.-40 deg. and obtuse angle part 31 and with the advance of the butt member 22 of a punch holder 16 a swaging pin 30 is pressed and the tip is formed with swaging in taper shape without any buckling. The tapered blank (d) transferred to the second station by feeding device with the ejection 54 is swaged to the head part with hexagonal hole inside a forming hole 15 by the second punch 48 with hexagonal pin 50 and the second die 10 and is ejected 55. The bolt with hexagonal hole can be press-formed in good shape without buckling in less process and with high efficiency.
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