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Stamping

Stripper System Components 235

The class describes the major types of strippers and springs used in die sets, as well as their advantages and disadvantages.

  • Difficulty Intermediate

  • Format Online

  • Number of Lessons 12

  • Language English

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Course Outline
  • Objectives
  • The Purpose of Stripper Systems
  • Fixed vs. Floating Strippers
  • Floating Stripper Components
  • Types of Floating Stripper Springs
  • Mechanical Springs
  • Mechanical Spring Classifications
  • Mechanical Spring Assembly
  • Nitrogen Springs
  • Mechanical vs. Nitrogen Springs
  • Stripper Design and Positioning
  • Summary
Objectives
  • Explain the role of the stripper system.
  • Identify the major categories of strippers.
  • Identify the common floating stripper components.
  • Identify the common types of stripper springs.
  • Describe the characteristics of mechanical springs.
  • Explain how mechanical springs are classified.
  • Describe common assembly methods for mechanical springs.
  • Describe the characteristics of nitrogen springs.
  • Compare the advantages of mechanical and nitrogen springs.
  • Explain how die complexity affects the design of the stripper.
Glossary
Vocabulary Term
Definition

chrome silicon spring

A mechanical spring made from steel containing the alloys chromium and silicon.

chrome vanadium spring

A mechanical spring made from steel containing the alloys chromium and vanadium.

deep drawing

A press operation that creates a hollow recess or cavity within sheet metal. The depth of the recess is greater than the width of the part.

deflection

The distance that a spring travels under a compressive force.

fixed stripper

A stripper that does not move within the die set. Fixed strippers strip the stock from the punch, but they do not hold down the stock during operation.

floating stripper

A stripper that is designed to move as press ram reaches the bottom of its stroke. Floating strippers hold down the stock during the stamping operation and strip the stock.

ISO

The International Organization for Standardization. ISO establishes standards and guidelines for various products and processes. ISO standards often contain metric units.

mechanical spring

A spring consisting of a coil of metal with a hollow center. Each mechanical spring is categorized according to the compressive force it can withstand.

mechanical spring stripper

A stripper consisting of a stripper plate and mechanical springs.

nitrogen spring

A spring consisting of a cylinder containing compressed nitrogen gas that applies pressure to a moveable piston.

nitrogen spring stripper

A stripper consisting of nitrogen springs, which are hollow cylinders containing compressed nitrogen gas.

preloading

The intentional compression of a spring before it is used in an operation.

spring

A device that yields under a compressive force and returns to its original shape once the force is removed.

stripper bolt

A bolt used to attach the stripper plate to the upper or lower die shoe. Mechanical springs may be fitted over the stripper bolt.

stripper plate

The metal plate that contacts the sheet to strip it from the punch. Stripper plates are commonly made from steel.

stripper system

The assembled components within a die set responsible for stripping the stock from the punch as it retracts.

urethane stripper

A stripper consisting of a hollow, cylindrical spring made from urethane rubber. The urethane spring bulges under compressive force.