| 摘要 |
PURPOSE:To enable the full enclosed die forging of a connecting rod by forming the part equivalent to the large end part of a connecting rod in globular shape or the similar shape by the method of upsetting, etc. after cross rolling of the billet. CONSTITUTION:An intermediate billet 24 is obtd. with using flat dies 21, 22 after heating a round bar stock 23 to the prescribed temp. In this case, the ratio of the diameter of the round bar stock 23 and the diameter of the minimum diameter part of the intermediate billet 24 is made to be <=60-70%. The intermediate billet 24 is formed in globular shape or the similar shape by upsetting and hammering then. In case of by upset forging the anvil having the work face of the necessary shape is used. The billet thus obtd. can be utilized effectively as the billet suitable for the full enclosed die forging.
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