Page 45 - MetalForming March 2015

Press Controls For All Presses
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Toledo Integrated Systems
Press Pilot 150 Control
We Provide Solutions For...
Mechanical Presses Hydraulic Presses Forging Presses Transfer Presses
Maximizer TPC (Total Press Control)
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www.ToledoIntegratedSystems.com 800-T-Toledo 419-867-4170
Tooling by Design
Toolroom Inspection
After completing die tryout, per- form these additional checks with the die open in the toolroom:
• Have any of the punches or any of the die sections been shimmed? If so, why?
• Do the pins and bushings show wear or score lines?
• Make sure it’s easy to release the stripper shoulder bolts and remove the strippers.
• Bluing the punches should reveal any punch-to-die interference.
• Remove all of the springs and care- fully check that the stripper can bottom without any interference or resistance.
• Spot-check punches and dies for proper Rockwell hardness.
• Check that every lifter and shred- der spring exhibits even pressure. Are the springs long enough to prevent premature failure due to fatigue?
• How many slugs are retained in the die bushings and die sections? Typ- ically there should be no more than three slugs, four maximum.
• Inspect all wear plates—surfaces should be smooth, not scored. Pay par- ticular attention to wear patterns that appear on one side only, indicating misalignment or uneven pressure from incorrectly set heel blocks.
• Welding and shimming sometimes are unavoidable, but they should not be present in critical areas. Workmanship for any welding or shimming should be high quality.
• Observe how the die components are reassembled. Toolmakers never should have to tighten screws using a pipe over a wrench. Fasteners are designed to function at specific clamp loads. A torque wrench is always required to ensure use of proper clamp- ing loads for each fastener.
If tool and die quality is important to you and your stamping operation, your die acceptance criteria must extend well beyond requiring your tool sup- pliers to produce parts to print or meet run-at-rate criteria. MF
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MetalForming/March 2015 43