Stamping tool transfer checklist

A die move is a project, not a courier job

Moving a stamping tool from one press to another, or from one supplier to another, looks like a logistics task. A crate, a lorry and a crane. The part is usually where the plan breaks, because a die that made good parts in one press is a set of hardened steel, springs and clearances that only works when the press, feed, material and setup match.

The commercial risk sits between the last good shipment and the first approved part at the new site. Tryout material, scrap, engineering time and lost line time all land in that gap. A checklist does not remove the risk, but it stops the risk from being discovered one item at a time after the die has moved.

The sequence matters. Records made after the die is on a pallet are guesses. Capture the condition, the last setup sheet and the strip and part samples while the tool is still in its proven press.

The seven areas to verify

The checklist covers the die, the press, the material and the evidence that proves the result. Each row names what should exist before the transfer is signed off.

Freeze the die condition before it leaves

Inspect and record the die in its proven press, not after it arrives. Photograph the working faces, cutting edges, pilots, stripper and scrap exits. Measure wear on the critical edges and note every repair, weld or insert added since the tool was built.

The maintenance history travels with the tool. Ask when it was last sharpened, how many strokes it has run since, and the expected life before the next service. A worn punch will produce a burr in any press, and the new supplier will be blamed for a condition that came with the die.

Record every spring, nitrogen cylinder, cushion and sensor, including temporary shims or disconnected sensors. A fix that is not written down becomes a permanent feature nobody understands. Keep a strip and a set of approved parts, labelled with date, material lot, press and setup.

Match the die to the new press

Every press has a window. Check the tonnage available at the working stroke, not only the nominal capacity. A die that runs close to the limit in one press may be outside the safe range in another with a different linkage or speed curve.

Check the shut height with the die closed and with any riser or bolster. Confirm the bed size and T slot spacing against the die shoe, and make sure the clamps do not foul the feed or scrap chute. Stroke, strokes per minute, cushion capacity and pin pattern belong on the same sheet.

The feed line is easy to overlook. Pass line height, coil width, straightener and feeder must line up with the die. A press that is strong enough but sits 50 mm too high needs a pit, a riser or a new feed, and any of those changes the budget.

Add the safety and controls: light guards, tonnage monitor, die protection sensors and the interface for in die sensing. A transferred die with disconnected sensors is a different process, even if day one looks the same.

Control the material, not just the tool

A die is designed around a strip. Grade, thickness, temper, width and coil set affect feed, springback and burr. The new site should use the same specification as the proven site, and the certificate should match the coil label.

If the material source changes, treat it as a process change. A different mill or temper can move a bend angle and a cut edge enough to need a setup adjustment. Run the trial on production material, not an offcut from the rack.

Check the lubricant. The same die can gall or wear faster with a different lubricant, and the change can affect a later plating or welding step. Record the lubricant, dilution and application method. Confirm the scrap route and coil handling before the first stroke.

Run the trial like a production shift

A trial that makes ten parts at half speed proves little. Run at the intended rate, with production material and the intended operator, and sample across the run. For illustration, 500 strokes at 60 strokes per minute gives a more useful picture than a handful of hand fed parts.

Measure the first off, the middle and the last off. Check critical dimensions, burr height, flatness and any locating feature. Record the press settings at the start and end, because a setting that drifts during the run is a process problem.

Watch for defects that appear after a move: slugs, galling, miss hits, cracks and marks from a worn stripper. A die that ran clean in the old press can miss hit in a new one because the feed timing or pilot release is different.

Agree acceptance before the trial: sample size, dimensions, defect limits and scrap allowance. A trial judged afterwards by whoever is in the room is not an approval.

Hand over the documents with the die

The tool is only half the transfer. The new site needs the drawing revision, die drawings, strip layout, setup sheet, tool history and wear parts list. Without them, every repair starts from a measurement exercise already done once.

Add the control plan, process failure mode analysis, last first article and any customer specific requirements. In a regulated programme, a move may need a new production part approval process submission, not only an internal trial report.

List the spares that travel with the die and those that must be ordered: punches, inserts, springs, sensors and custom fasteners. A die that arrives without its spare punch set loses a week at the first wear event.

Record ownership and access rights. If the die belongs to the buyer, the handover should say where it is stored, who may move it and what happens at the end of the programme.

Settle the commercial terms before the move

Agree who pays for crating, freight, insurance and rigging, and who carries the risk in transit. Agree who buys tryout material, who owns the scrap and who absorbs downtime if the press is not ready.

Put dates against the gates: condition record, crating, arrival, mounting, trial, first off and run at rate. Hold payment or retention against run at rate, not delivery. Delivery proves the die arrived; it does not prove the part.

Define what happens if the trial fails. The supplier should correct a setup fault at its own cost, and the buyer should pay where a drawing or material change caused the failure. Write the split down before the argument.

Review the first month of production against the old site baseline: scrap rate, tool wear and cycle time. A transfer that passes the trial and then drifts is not complete.