What is the definition of "eccentric drive"?
A drive that uses an offset section to power the reciprocating motion of the ram.

Learn more about eccentric drive in the class Press Basics 110 below.


Stamping Training


Class Information
Tooling U-SME classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.
Class Name:Press Basics 110
Description:This class introduces common stamping presses, as well as their main components and functions.
Prerequisites: none
Difficulty:Beginner
Number of Lessons:15
Language:English, Spanish
 
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Class Outline
  • Objectives
  • What Is a Press?
  • What Is Stamping?
  • Major Press Components
  • The Die Set
  • The Gap-Frame Press
  • Straight-Side Press
  • The Mechanical Press
  • The Hydraulic Press
  • Capacity of a Press
  • Range of Press Capacities
  • Press Forces
  • The Press Brake and Turret Press
  • The Arch Press and Horn Press
  • Summary
  
Class Objectives
  • Describe a press.
  • Describe stamping.
  • Identify major press components.
  • Describe the die set.
  • Identify the gap-frame press.
  • Identify the straight-side press.
  • Describe the mechanical press.
  • Describe the hydraulic press.
  • Define capacity.
  • Relate press style to possible capacity.
  • Describe the importance of shear forces.
  • Identify the press brake.
  • Identify the turret press.
  • Identify the arch press.
  • Identify the horn press.

Class Vocabulary

Vocabulary TermDefinition
arch press A type of press similar to a straight-side press with an enlarged bed and bell-shaped frame. The arch press can accommodate larger sheets of metal.
bed The main foundation and supporting structure upon which the operating parts of the machine are mounted and guided.
bending The shaping of sheet metal by straining the metal around a straight axis. A bending operation compresses the interior side of the bend and stretches the exterior side. Flanging, hemming, and seaming are all bending operations.
blanking A shearing operation that creates a hole in sheet metal by separating an interior section. The removed piece of metal is the desired section.
bolster plate A plate that is designed to hold in place the lower die shoe. The bolster plate is attached to the top surface of the press bed.
capacity The specified amount of force that a press is capable of exerting near the bottom of its stroke in order to carry out a stamping operation.
C-frame press Another term for the gap-frame press.
cold working The shaping of metal at temperatures much lower than the metal's molten state, often at room temperature. Cold working adds certain properties to the metal, such as increased strength and improved surface finish.
crankshaft The device in some mechanical presses that connects the ram to the flywheel.
crown The upper portion of a press containing the drive mechanisms or cylinders that guide the reciprocating motion of the ram.
cylinder The main drive of a hydraulic press that uses fluid to force the motion of a piston encased within the device.
deep drawing A drawing operation performed on sheet metal that creates a hollow shape with a depth greater than its width.
deflection The amount of deviation from a straight line or plane when a force is applied. Effective presses reduce the amount of deflection during operation.
die The tool typically attached to the lower portion of the die set containing a recess that provides space for the shaping or shearing of sheet metal.
die set The collective assembly of upper and lower die shoes, guide pins and bushings, and punch and die holders.
drawing For sheet metal, a forming operation that transforms a flat disc of stock into a hollow cup with an enclosed bottom. Drawing operations can also create boxes and more intricate shapes as well.
eccentric drive A drive that uses an offset section to power the reciprocating motion of the ram.
flanging A bending operation that bends the edge of a part to add stiffness. Flanging most often creates a 90 degree bend in the metal.
flywheel The main device located in the crown of a mechanical press that is attached to the power source and regulates the reciprocating motion of the ram.
frame The structure of a press that supports the ram above the base and guides the reciprocating motion of the ram.
gap-frame press A type of press with a C-shaped frame suspending the crown over the bed and an open portion in the front. The open front of the gap-frame press offers easy access to the die set.
horn press A type of press with a cylindrical projection designed to position sheet metal parts for secondary operations.
hot working The shaping of metal at temperatures close to the metal's molten state. Metal that has been hot worked is often left with a rough, scaly exterior.
hydraulic power Power derived from the motion and pressure of a fluid, such as water or oil.
hydraulic press A press that is driven by hydraulic power. Most hydraulic presses are driven by one or more cylinders that use fluid pressure.
lower die shoe The lower plate of a die set that contains the cavity into which the punch shears the sheet metal.
mechanical power Power derived from the use of solid tooling and machinery.
mechanical press A press that is driven by mechanical power. Most mechanical presses are driven by a flywheel, crank, and clutch.
metal forming The plastic deformation of a metal in order to produce a useful shape. Sheet metal can be formed through operations that shear, stretch, bend, or compress the metal.
open-back inclinable press A type of gap-frame press with a bed and frame that can be tilted backwards to encourage the removal of parts after they are separated from the strip.
press A machine with a stationary base and an upper ram that moves along a vertical axis to shear, bend, or form sheet metal.
press brake A type of press with an open frame and wide, narrow bed. Press brakes are often used for bending operations, and they are typically manually operated.
punch The tool typically attached to the upper portion of the die set that shapes or penetrates the sheet metal.
punching A shearing operation that creates an open hole in sheet metal by separating an interior section. The removed metal section is discarded scrap.
ram The main upper portion of the press that slides up and down within the press frame. The upper die shoe is attached to the ram.
seaming A bending operation that joins the interlocking edges of two separate metal sheets together by folding them over one another.
shear force A force that attempts to cause the internal structure of a material to slide against itself.
shear strength The ability of a material to resist forces that attempt to cause the internal structure of the material to slide against itself.
stamping The process of forming sheet metal at room temperature with the use of dies and punches.
straight-side press A type of press with supporting columns in each corner of the frame suspending the crown over the bed. The straight-side press offers improved rigidity and reduced deflection.
stroke The distance marked by the farthest ends of reciprocating vertical movement of the press ram.
turret press A type of press with an open frame and a turret containing multiple punches. Turret presses are mostly used to perform a variety of shearing operations, and they are typically numerically controlled.
upper die shoe The upper plate of a die set that secures the punch holder.