CLOSED FORGING METHOD FOR UNIVERSAL JOINT TRUNNION AND UNIVERSAL JOINT TRUNNION

WIPO Patent Application WO/2015/146879

A1

A closed forging method for a universal joint trunnion (7, 57) wherein a plurality of shanks (10, 60) are formed radially on a boss (8, 58), the closed forging method being characterized in that a forging mold is configured from an openable/closeable die (16, 17) that has formed therein a cavity (20) that approximately corresponds to the trunnion (7, 57), a pair of upper/lower punches (18, 19) that are arranged on a central axis of the die (16, 17) so as to be reciprocally movable and that press a billet (15a, 15a', 15b, 15b'), and a filling punch (30) that is arranged on the central axis of shank-forming mold parts (16a, 17a) of the cavity (20) and that can advance in the radial direction. The closed forging method is also characterized in that the billet (15a, 15b) is inserted into the die (16, 17), and, when the filling punch (30) is advanced inside the cavity (20) of the closed die (16, 17) and is positioned inside the cavity (20), the shanks (10, 60) and a recessed part (25, 75) on the insides thereof are formed as a result of the billet (15a, 15a', 15b, 15b') being pressed by the upper/lower punches (18, 19).

JP2000176557	METHOD FOR DEEP DRAW FORMING AND DEVICE THEREFOR
JPS57134016	UNIVERSAL TRANSMITTING JOINT AND ITS MANUFACTURE
JP3567691	Block forging method

MIAO JIA HUA (JP)
SERA AKIRA (JP)

PCT/JP2015/058668

October 01, 2015

March 23, 2015

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NTN TOYO BEARING CO LTD (JP)
MIAO JIA HUA (JP)
SERA AKIRA (JP)

B21K1/14; B21J5/02; F16D3/20; F16D3/205

US3583198A	1971-06-08
JP2010142869A	2010-07-01
JPS5650744A	1981-05-08
JP2014016007A	2014-01-30
JPS51103861A	1976-09-14

SHIROMURA Kunihiko et al. (JP)
Kunihiko Shiromura (JP)

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