| 摘要 |
Multiple upset, cold pressure, welding apparatus, incorporating an electrically driven actuation means includes a welding die set (2) having two pairs of die halves each formed with a groove providing a bore in a closed position for gripping end portions of first and second workpieces (32) and also being reciprocable to apply a welding pressure across abutting faces of the workpieces. The welding die set is mounted in blocks (4) reciprocable in a housing (6) and connected through pivot (8A) to lever arms (10, 12) mounted on fulcrum pins (14, 16) on the housing. End portions (34, 36) of the lever arms are biassed toward each other by springs (not shown) and carry cam follower rollers (37, 39) held in engagement with an elliptical cam surface (46A) on a cam (48A). The cam (48A) is mounted on an output shaft (22A) of a speed-reducing gear box (20A) driven by a high Torque, low speed, electric motor (18A) energisable through a pre-programmed sequencying controller (not shown). In operation, end portions of the wire workpiece (32) are positioned in the welding die set (2) and the electric motor (18A) energised to rotate the cam (48A) thereby effecting oscillation of the lever arms (10, 12) and reciprocation of the blocks (4) to effect a multiple upset weld in the workpiece (32) following a pre-determined series of cycles. Other forms of drive connections and other forms of welding die sets are also described. |
