The Optimal Stroke Is the Shortest Possible Stroke

FIg-2-Velocity-Diagram-Link-Motion-StrokeA careful analysis of the part to be shaped and the feed system will provide insight into the shortest possible stroke length for a given process. At any point during the crank rotation, one of the following occurs:

  • Cutting, forming, etc.
  • Material feeding
  • Piloting
  • Gap opening/closing to provide clearance for feeding.

Other operations, such as inspection or welding, can be incorporated into the cycle. This only should be considered when the value-add is greater than the reduction of efficiency at the press. In the tradeoff consideration, consider all of the factors discussed above.

A shorter stroke yields:

  • Fewer punch breakages in the tool
  • Longer intervals between tool sharpening 
  • Better forming results
  • Longer press life
  • Less vibration
  • Less noise
  • Fewer nuisance faults.

Biases and assumptions in tool design or equipment selection can be difficult to detect and change. More obvious reasons for less-than-optimal stamping processes:

  • Equipment is not used for its intended purpose 
    • Making a job work on available equipment 
    • Purchasing equipment that “would do the job”
    • Purchasing new equipment at discounted price
    • Repurposing existing equipment
  • Operating conditions/tradeoff values have changed dramatically 
    • Production volumes/lot sizes have changed significantly
    • Product specifications/part tolerances have been tightened
    • Production requirements for quality, certifications, packaging and delivery have changed 
  • Equipment is outdated 
    • Newer technology not utilized
    • Lack of automation
    • Lack of spare parts 
    • Decreased serviceability
  • • Equipment has lost its precision from when it was new
    • Damages due to operating error
    • Material fatigue, improper repairs
    • Normal wear
    • Past modifications.

How to Improve the Stamping Process

Efforts to optimize start with an open mindset and a willingness to allow discoveries to effect change. It requires an environment where we replace assumptions with reason, and re-evaluate prior decisions based on changes in the operating conditions. Hiring an outside expert that provides an unbiased analysis and technological insights can be helpful. Sometimes simple remedies can make a significant difference. MF

Article provided by Sangiacomo Presses Americas, LLC.

Industry-Related Terms: Die, Forming, Point, Ram, Run, Stroke, Thickness
View Glossary of Metalforming Terms


See also: Sangiacomo Presses Americas, LLC

Technologies: Stamping Presses


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