Selling a virtual model with a forming line used to be a marketing flourish. It is becoming a contractual deliverable, and the acceptance criteria are turning the idea into engineering.
From simulation to acceptance
When a builder supplies a validated twin, the buyer can test control sequences, dry-run cycle times and failure behaviour before anything is installed on site. The valuable part is not the geometry. It is the behaviour of the control system under conditions you do not want to create on a real line.
What validation actually requires
A model that matches a machine in a demonstration is not a validated model. Validation means measured error against a defined envelope, with the tolerance stated and the measurement method documented. The suppliers doing this properly are publishing their residuals, which is unusual and welcome.
For the buyer
Ask for the validation report, not the animation. Ask what parameters were fitted and what the residuals look like at the edges of the operating envelope, which is where you will actually run the machine.
