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Stamping

Die Cutting Variables 200

This class describes the steps that take place during a cutting operation and shows how clearance impacts the cutting process. Includes an Interactive Lab.

  • Difficulty Intermediate

  • Format Online

  • Number of Lessons 14

  • Language English

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Course Outline
  • Objectives
  • What Is Die Cutting?
  • Shearing Forces
  • The Steps of Die Cutting
  • Deformation
  • Fracture
  • Snap-Through
  • Stripping
  • Clearance
  • Determining Clearance
  • Insufficient Clearance
  • Excessive Clearance
  • Calculating Cutting Forces
  • Summary
Objectives
  • Describe the general force applied during die cutting.
  • Describe specific forces that occur during die cutting.
  • Identify the steps that take place during die cutting.
  • Explain the deformation process.
  • Explain the fracture process.
  • Explain the snap-through process.
  • Explain the stripping process.
  • Define clearance.
  • Define angular clearance.
  • Describe the factors that determine proper clearance.
  • Explain the result of insufficient clearance.
  • Explain the result of excessive clearance.
  • Describe the factors that determine cutting forces.
Glossary
Vocabulary Term
Definition

angular clearance

The enlarged section below the die opening that allows the blank to fall from the die.

blanking

A shearing operation that creates a hole in sheet metal by separating an interior section. The removed piece of metal is the desired part.

break off

A practical term for the rough, fractured ring surrounding the edge of a blank.

burnishing

The creation of a shiny, polished surface on metal due to a shearing action.

clearance

The space between the punch and the die that allows metal to be cut.

compressive force

A force or pressure that attempts to flatten or squeeze a material.

cut band

A practical term for the burnished ring surrounding the edge of a blank.

deflection

The misalignment of components due to various stresses.

deformation

The moment during which the punch penetrates the sheet and metal flows into the die opening. Deformation and penetration cause the edge radius and burnished ring.

double breakage

The condition of two separate deformation stages caused by insufficient clearance. Double breakage causes two burnished rings on the blank edge.

edge radius

A rounded edge on a blank caused by the initial deformation as the punch begins to enter the die.

fracture

The moment during which cracks form and the blank separates with a tearing action. Fracture causes the roughened break off section on the edge.

lubricant

A fluid designed to reduce friction and cutting forces during a stamping operation.

punching

A shearing operation that creates an open hole in sheet metal by separating an interior section. The removed metal section is discarded scrap.

shear strength

The ability of a material to resist forces that attempt to cause the internal structure of the material to slide against itself.

shearing

The cutting and separating of material without the formation of chips.

snap-through

The moment during which the blank separates from the sheet and compressive forces are released from the die components.

stripper

A plate designed to remove sheet metal stock from the punch as it pulls away from the die during the operation.

stripping

The moment during which the punch retracts from the die and is removed from the sheet.

taper

An angled surface that appears on the edge of a blank. Taper is the result of clearance between the punch and die.

tensile strength

The ability of a material to resist forces that attempt to pull it apart or stretch it.