Page 44 - MetalForming July 2013

Remanufacturing
price of a comparable new machine. Among the most desirable heavy-duty American-made RW machine brands from years past: Taylor-Winfield, Fed- eral, Precision, Peer, Progressive, Ban- ner and Sciaky.
Differentiating Between Light- and Heavy-Duty
Since some of the respected manu- facturers mentioned above also mar-
keted light-duty models to compete with imports, it’s important to under- stand the differences.
When considering the remanufac- ture of an RW machine, look for a model with as many of these features as possible:
• Heavy-duty cast-copper secondary conductors with built-in water-cool- ing circuits.
• Arms, electrode holders and all
other secondary conductors fabricated of copper, rather than less-conductive brass.
• Stacked-core RW transformers with adequate water-cooling circuits.
• Easily accessible transformer tap switch with six to eight steps of coarse heat regulation.
• In vertical-action press-type spot- and projection-welding machines, look for a roller-type or ball-bearing ram design; avoid the quill-type metal-to- metal rams commonly used in lower- cost machines.
• Also relative to press-type welders, look for a machine with a fast-follow-up device built into the ram, such as a die spring or diaphragm-type air cylinder.
• Other desirable features include adjustable- and retractable-stroke air cylinders.
If you can’t decide between likely candidate machines for a remanufac- ture project, weigh the machines being considered and select the heaviest. And, for best results, use the suggested remanufacturing steps as outlined in the sidebar.
Control Retrofits
Due to significant advances in RW process-control technology, plan to scrap old, obsolete controls and invest in a new control. And, if you’re willing to make a substantial investment to have the latest inverter-type mid-fre- quency direct current (MFDC) RW technology, new MFDC transformers and controls can be retrofitted to old machine frames. This single-phase AC to three-phase DC conversion can pro- vide significant power savings, along with higher secondary currents and a more precisely controllable output.
In addition, there is a retrofit control now available that converts an existing AC RW machine to inverter technology, including integral weld monitoring and adaptive feedback. And, this retrofit package preserves the robust trans- former design of a standard AC resist- ance welder.
Another relatively new welder control feature available: a soft-touch option that improves operator safety. MF
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Calculates component
lengths automatically based on shut height for maximum engagement
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access through 3D CAD Link at www.superiordieset.com
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Type:
Type A Ball Bearing
Style:
Style 75
Ball Bearing Type:
1020
Width (F - B):
3B
4 - 150
Length (L - R):
64
4 - 150
Minimum Shut Height: 11.5
3 - 30
Punch Holder Thickness: 2.5
0.75 - 6
Die Shoe Thickness:
3
0.75 - 6
Diameter of Components 2
Pin Type:
Straight
Bushing Type: Demountable
Pin Length:
11
Bushing Length:
5
Cage Length:
4.5
Pin Part #: 331-1644
Bushing Part #: 336-1650
Ball Cage Part #: 335-1618
Standard
Maxicage
Material:
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(.sldasm, .step, .prt, .igs etc.)
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42 MetalForming/July 2013
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