Metal fusion bonding – Process – With shaping
Patent
1998-01-19
2000-04-04
Ryan, Patrick
Metal fusion bonding
Process
With shaping
228 491, 228212, 140112, B21D 3900, B23K 114, B23K 522
Patent
active
060450312
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for producing wire grid mats from longitudinal wires and transverse wires crossing one another at right angles and welded at the crossing points, in which the longitudinal wires are advanced incrementally and the transverse wires are moved transversely to the motion of the longitudinal wires into a welding line and are welded to the longitudinal wires, and to an apparatus for performing the method.
From Soviet Union Patent SU 837 668, a welding method and a resistance welding machine for producing steel reinforcement grid mats are known in which the transverse wire is clamped while being delivered to the welding line. A disadvantage here is that the clamping force is not adjustable but instead depends on the structurally predetermined increase in spacing of the clamping jaws during the delivery motion and on the spring constants of any relief springs that may be present.
Austrian Patent AT 395 229 to which U.S. Pat. No. 5,113,915, Ritter et al. corresponds, discloses a welding machine for producing wire grid mats that overcomes these disadvantages. However, this welding machine has no devices whatever for treating the longitudinal wires and/or transverse wires, which as a result of their production, pretreatment and/or manipulation in being delivered to the welding line may have a longitudinal twist or residual torsion.
The object of the invention is to disclose a method and an apparatus that, while exploiting the advantage of clamping the transverse wires, make it possible in a structurally simple, operationally safe and reliable way to product flat wire grid mats from longitudinal wires and transverse wires whose residual twist or residual torsion is balanced out. The method according to the invention is distinguished in that at least one of the transverse wires, after being delivered to the welding line, is clamped with a predetermined adjustable magnitude, and that before being welded to the longitudinal wires at least one end of this transverse wire is rotated about its longitudinal axis by a predetermined adjustable angle, whereupon the transverse wire is welded to the longitudinal wires.
In a preferred embodiment of the invention, the two ends of at least one transverse wire may be rotated by equal-sized, oppositely oriented angles. However, it is also possible, within one wire grid mat, for the ends of all the successive transverse wires to be rotated by equal-sized angles, preferably in the same direction. Alternatively, according to the invention, the ends of all the successive transverse wires within one wire grid mat may be rotated by different-sized angles, preferably in the same direction, and the order of the amounts of the rotary angles is selectable, and at least one transverse wire remains unrotated. An apparatus intended for performing the method, having clamping jaws for grasping the ends of the transverse wires and having clamping devices for clamping the transverse wire in the electrode-equipped welding line of a grid welding machine, has the characteristics that on both sides of the longitudinal wire advancement path of the grid welding machine, one rotating and clamping device each is disposed; that in each rotating and clamping device, for clamping one transverse wire end, one upper clamping body each and one lower clamping body each are disposed, vertically displaceably and drivably, in a guide body, and each clamping body has a substantially horizontally displaceable clamping slide; that for rotating one transverse wire end about its longitudinal axis, the guide body is supported with a bearing trunnion rotatably in a stationary bearing body; and that each rotating and clamping device is triggerable separately. Preferably, for clamping a transverse wire end, a work cylinder acting with its piston rod on the upper clamping body and secured to the guide body is provided.
In a refinement of the invention, the guide body has a laterally cantilevered pivot pin extending parallel to the bearing trunnion, and the piston rod of one work cylinder each eng
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Ritter Gerhard
Ritter Klaus
EVG Entwicklungs-u.Verwertungs-Gesellschaft m.b.H.
Ryan Patrick
Stoner Kiley
LandOfFree
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