To provide a method for manufacturing a connecting rod capable of increasing the cross-section secondary moment of a rod part by the coining operation, and achieving the high buckling strength of the rod part.
When manufacturing a connecting rod by executing the coining operation to a hot-forged material 10B, a sealed closing type coining die 40 having an upper forming die 46, a lower forming die 52 and a pair of right and left side forming dies 58, 60 is used as a coining die of a rod part 20. During the coining operation, the rod part 20 is vertically held by the upper and lower forming dies 46, 52, the rod part 20 is held in the right-to-left direction by the pair of side forming dies 58, 60. The rod part 20 is simultaneously pressed from four faces of the upper and lower faces and the right and left faces to execute the work-hardening by imparting the shape correction and the strain of the rod part 20.
SONE KENJI
YAMAGUCHI KATSUYA
FUJIWARA MASANAO
YOSHIDA HIROAKI
DAIDO STEEL CO LTD
JP2006142355A | 2006-06-08 | |||
JPH01233034A | 1989-09-18 | |||
JP2005014079A | 2005-01-20 | |||
JP2006142355A | 2006-06-08 |
Next Patent: STAINLESS STEEL-MADE WIRE FOR WARM FORGING, AND PLASTIC WORKING METHOD