ความแตกต่างระหว่างก่อนและหลังการตัด

Here we will talk about the differences between Pre-Cut And Post-Cut operations.

Pre-Cut Pros

Reduce the cost of cut-off dies and their maintenance.
No buff on the ends.
Ability to hand-feed strips or sheets for low-volume production.
In roofing and wall panel products, pre-cut avoids cut-off distortion because running different gauges and yield with the same roll tooling affects the final shape which may not match the blade even though it is within tolerances.

Pre-Cut Cons

Possibility of increased end flare, especially in deeper parts.
Requires more forming stations making the roll forming mill and tooling more expensive.
Generally requires more floor space.
Shorter products are more of a challenge and can introduce part quality issues
Difficult multi-bend parts can be a problem in terms of quality
Pre-cut may require intermediate guides, especially when running short pieces. Adjusting these guides becomes problematic with multiple width guides

Post-Cut Pros

Production rate is higher with post-cut
Better part control in terms of quality
Reduces end flare considerably. End flare can be controlled
Better results for high-strength steels such as dual phase and martensitic steels
Lengths as short as 2-3 inches
End straighteners are most effective in post-cut, controlling bow, camber and twist.
No leading edge deformation of the part in post-cut.
Ability to provide punching/notching during the cut-off operation, possibly eliminating one or more secondary operations

Post-Cut Cons

Expensive cut-off press and die
Maintenance costs, especially for the cut-off die
End burr resulting in rough end
May require manual feeding of leading end of first part upon introduction of a new coil
In many cases, all surfaces must be supported in order to avoid end distortion. This is not always possible due to inability to build robust die sections into the die OR the need to leave an opening in a practically close space

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