Feed Accuracy Critical

In addition to the high-lift head feature on the seven-roll pull-through straightener, located at the entry end of the feed, Sigler highlights other coil-line features.

“The system uses a zero-backlash gearbox that is extremely accurate,” he says. “Feed length is right on the money —if we’re off by 0.2 mm on each pitch, after 18 die stations the die won’t run. Parts will stick and we’d mishit.

“Also, the feed rolls are flat, while other models may use concave rollers that wear flat,” says Sigler. “We have experienced difficulties with concave feed rolls.”

CHS also outfitted the line with hydraulic-powered coil keepers. With the flip of a switch the operators automatically index the keepers into place, rather than having to manually lift them into position with each coil change.

“And, as an option,” adds Sigler, “we specified the addition of a sensor that signals when the number of coil wraps is getting low.In this case, when we get close to the end of a coil, the mandrel automatically retracts to its smallest diameter and stops spinning. The tail end of the coil then easily pulls off—no need for the operator to tend to the coil end while the press runs, which can create a hazardous situation.

“I’m a tool guy,” concludes Sigler. “If my presses and feed lines are more repeatable and accurate, my equipment-related downtime goes down. I’m not saddled with making adjustments. The process is stable and predictable.” MF

Industry-Related Terms: Die, Lines, Mandrel, Run, Surface, Bed, Case, Corner
View Glossary of Metalforming Terms


See also: Pneumatic Feed Service

Technologies: Coil and Sheet Handling, Stamping Presses


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