| 摘要 |
PURPOSE:To perform full enclosed die forging of two each of connecting rods and caps simultaneously and to prevent trouble due to burrs by including in the forging work at least three processes of preforming, finish forming and separation. CONSTITUTION:In the preforming process, a flattened material W, which has been formed by collapsing a cylindrical material through a collapsing process, is forge i full enclosed dies to preform an intermediate products P having such a shape that two connecting rods and caps are piled and the punch-working side face 4a is surrounded by a flange F extending outward. At the time, even if burrs B generates in the longitudinal clearance between the die 3 and the punch 4, they cause no trouble. The die 13 and punch 14, in the following finish process, secure a relatively large clearance compared with the preforming process. As a result, no interferance between burrs and the punch 14 occurs, and therefore, no burrs fall toward the intermediate product P. In the next separation process, burrs B and excessive materials around the flange F are removed.
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