Die Assembly and Tryout

After CNC machining, WEDM, drilling, grinding, and other machining processes are completed, the tooling components are moved to the assembly area.
The assembly team installs and fits die plates, inserts, punches, cutting components, forming blocks, stripper plates, guide parts, springs, nitrogen cylinders, fasteners, and other functional components according to the die structure.
During assembly, the team checks component matching, movement clearance, sliding condition, fastening condition, and basic die operation. Hand fitting and surface adjustment may be carried out where required to improve the contact condition and prepare the die for spotting and tryout.

Before formal tryout, red and blue spotting are used to review contact conditions on forming surfaces and related tooling areas.
Spotting helps the team identify high spots, uneven contact, insufficient contact, and areas requiring further fitting, polishing, bedding-in, or correction. This step is especially important for forming areas where surface contact directly affects part shape, forming stability, and tool performance.
Red spotting is commonly used for general contact review, while blue spotting can support more detailed contact checking where finer adjustment is required.
After spotting review, the die is adjusted and rechecked until the contact condition is suitable for the next stage.

After assembly and spotting adjustment, the die is mounted on the press for formal tryout.
During tryout, the team checks die movement, feeding condition, strip movement, forming result, trimming result, piercing condition, bending condition, drawing condition, and stamped sample quality. Trial strips or sample parts are reviewed to identify forming defects, trimming issues, burr condition, surface marks, springback, hole position deviation, or dimensional problems.
When an issue is found, the tryout result is passed back to the tooling, machining, design, and quality teams for correction. The die may be adjusted and tested again until the sample condition is ready for customer review or internal confirmation.

Review Items:

• Die movement and press operation
• Strip movement and feeding condition
• Forming, bending, drawing, trimming, and piercing result
• Trial strip or stamped sample condition
• Surface marks, burrs, and springback
• Key dimensions and inspection feedback
• Tooling correction requirements

After formal tryout and sample review, stamped samples are inspected according to customer drawings and project requirements.
Depending on the project, final confirmation may include dimensional measurement, checking fixture validation, CMM inspection, 3D scanning, visual review, and sample comparison. The team reviews part shape, hole position, trimming condition, surface condition, forming result, and other key features before confirming whether the tool is ready for customer review, shipment, or production support.
If further issues are identified, the die is corrected and tested again before final confirmation.