Closed forging press
专利汇可以提供Closed forging press专利检索，专利查询，专利分析的服务。并且PURPOSE: To relatively move punches in a fixed relation without working problems and any hindrance near the working area by securing the pistons which move cooperatively with rams to the respective rams for a pair of opposing punches and mutually connecting said both cylinders by the oil lines of a closed circuit.
CONSTITUTION: The clockwise turning of a crank 15 causes an upper die 8 to be pushed down by a press ram 11 and to contact closely with a lower die 9 and stop, thereby performing the primary working of a material 10. Until the crank 15 reaches the lower dead point from this, the working strokes of rams 1, 2 for punches take place. At the same time, the restraining relations by the closed circuit consisting of cylinders 5, 6 and oil lines 7, 7' generate with respect to these respective working strokes. If, for example, the diameter (d
1 ) of the pistons 3, 3 and the diameter (d
2 ) of the piston 4 are assumed to be 2d
1
2 =d
2
2 , the indenting sizes (l
1 ), (l
2 ) of the punches 1a, 2a are precisely equal and both are exactly equal in the indentation start point and indentation speed. If the relations of the diameters (d
1 ), (d
2 ) are changed, the difference of the sizes (l
1 ), (l
2 ) or indentation speeds is set.
COPYRIGHT: (C)1980,JPO&Japio，下面是Closed forging press专利的具体信息内容。
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