Method and apparatus for simultaneously upsetting the ends of a

Details Method and apparatus for simultaneously upsetting the ends of a Method and apparatus for simultaneously upsetting the ends of a

1994-01-21

1994-11-22

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72357, B21K 152

Patent

active

053657659

ABSTRACT:
A punch press assembly (20) simultaneously upsets two ends (22) of a cylindrical blank (24) to produce a chain pin (34) having an extruded grain structure (134) which extends parallel to its longitudinal axis (B) into the upset regions of the chain pin (34). The punch press (20) clamps an upper die (30) to a lower die (26) via a mechanical crank (45), attached to the upper die (30) with lost motion (80,82). While maintaining the clamping relationship between the upper (30) and lower (26) dies, the downwardly directed force created by the mechanical crank (45) is transferred to the horizontal punches (36) by the two pairs of wedges (58,60). The two lower wedges (60) slide horizontally along two tie rods (84) and force the two punches (36) into the recess (28) to upset the ends of the cylindrical blank (24) to form a chain pin (34).

REFERENCES:
patent: 402695 (1889-05-01), Simpson
patent: 868321 (1907-10-01), Blakeslee, Jr.
patent: 1572376 (1926-02-01), Bingham
patent: 1946117 (1934-02-01), Sparks
patent: 2667796 (1954-02-01), Shields
patent: 2755545 (1956-07-01), Moore
patent: 3157111 (1964-11-01), Anderson
patent: 3588933 (1971-06-01), Shinopulos et al.
patent: 4389871 (1983-06-01), Takeuchi et al.
patent: 4414728 (1983-11-01), Ford et al.
patent: 4580432 (1986-04-01), Breazeale et al.
patent: 4693107 (1987-09-01), Kohama et al.

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