What is the definition of "coining"?
A metalworking operation used to create raised surfaces and imprints in metal. Coining is a relatively severe operation that creates variations in metal thickness.

Learn more about coining in the class Punch and Die Operations 120 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:Punch and Die Operations 120
Description:This class introduces the common sheet metal operations performed with the help of dies and presses. Includes an Interactive Lab.
Prerequisites: none
Difficulty:Beginner
Number of Lessons:16
Language:English, Spanish
 
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Class Outline
  • Objectives
  • Metal Forming and Press Operations
  • Cold Work vs. Hot Work
  • Metalworking Categories
  • Shearing
  • Blanking and Punching
  • Fine Blanking
  • Cutoff and Parting
  • Notching, Lancing, and Shaving
  • Bending
  • Flanging, Hemming, and Seaming
  • Embossing and Coining
  • Drawing
  • Trimming and Curling
  • Necking and Bulging
  • Summary
  
Class Objectives
  • Describe metal forming.
  • Distinguish between cold working and hot working.
  • Identify the forces applied to sheet metal.
  • Describe shearing.
  • Distinguish between blanking and punching.
  • Describe fine blanking.
  • Describe cutoff and parting.
  • Distinguish between notching and lancing.
  • Describe shaving.
  • Describe bending.
  • Identify bending operations.
  • Distinguish between embossing and coining.
  • Describe drawing.
  • Describe trimming.
  • Describe curling.
  • Describe necking.
  • Describe bulging.

Class Vocabulary

Vocabulary TermDefinition
axis An imaginary straight line that is used to measure the dimensions of an object.
bar stock Raw material purchased from metal manufacturers in the form of long cylindrical bars.
beading Another term used for a curling operation.
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.
blank The section of sheet material resulting from a blanking operation that is usually subjected to further metalworking 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.
bulging A forming operation that increases the diameter of a portion of a hollow cylindrical part. Bulging also slightly shortens the part, and it requires the use of a rubber punch or pressurized fluid.
chip An unwanted piece of metal that is removed from a workpiece. Numerous chips are formed when a tool cuts or grinds metal.
clearance The amount of space between the outer edge of the punch and the inner edge of the die cavity. A proper amount of clearance is necessary for an effective shearing operation.
coining A metalworking operation used to create raised surfaces and imprints in metal. Coining is a relatively severe operation that creates variations in metal thickness.
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.
curling A forming operation that creates a curved rim around the top of a hollow part.
cutoff A shearing operation that performs a single cut in order to separate a piece of metal from the original stock. Each cut separates a new part.
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.
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.
edge bending A bending operation performed by compressing the sheet metal between two flat dies and using a punch to bend an extended portion of the sheet over the lower corner of the wiping die.
embossing A metalworking operation used to create raised surfaces or lettering in sheet metal. There is theoretically no change in metal thickness during embossing.
fine blanking A type of blanking operation that simultaneously compresses and shears sheet metal in order to reduce the amount of tearing along the edge. Fine blanking produces blanks with edges that are entirely smooth.
flanging A bending operation that bends the edge of a part in order to add stiffness. Flanging most often creates a 90° bend in the metal.
flattening Another term used for a hemming operation.
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.
hardness The ability of a material to resist penetration and scratching. Hardness is one of the mechanical properties of a given material.
hemming A bending operation that bends and folds an edge of sheet metal back upon itself. Hemming conceals the sharp edge of sheet metal.
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.
lancing A shearing operation that cuts an interior section of the metal without removing the section. A lancing operation leaves an opened metal tab.
necking A forming operation that reduces the diameter of a portion of a hollow cylindrical part. Necking also slightly lengthens the part.
nesting The arrangement of a series of part dimensions on sheet metal that attempts to reduce the amount of metal scrap produced during the press operation.
notching A shearing operation that removes a section from the outer edge of the metal strip or part.
parting A shearing operation that performs two cuts simultaneously in order to separate a piece of metal from the original stock. A parting operation produces metal scrap along with the part.
piercing Another term for a punching operation. For various manufacturers, the term "piercing" refers to a punching operation that does not produce a slug, or it is used in a more general sense.
plastic deformation Deformation that is permanent. Plastic deformation occurs after excessive elastic deformation.
press A machine with a stationary base and an upper ram that moves along a vertical axis to shear, bend, or form sheet metal.
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.
seaming A bending operation that joins the interlocking edges of two separate metal sheets together by folding them over one another.
shaving A shearing operation that smooths and finishes a previously cut edge. Shaving operations produce a minimal amount of 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. Punching, piercing, lancing, parting, notching, and shaving are all shearing operations.
sheet metal Flat metal stock with a thickness greater than 1/64 in. and no larger than 1/4 in.
shrink flange A flanging operation that creates a bent edge that curves outward in the center.
slug The discarded section of metal resulting from a punching operation.
springback The tendency for sheet metal to return to its original shape after a bending or forming operation.
strength The ability of a metal to resist forces that attempt to break or deform the metal. A material exhibits tensile, compression, or shear strength, depending on the direction of the force.
stretch flange A flanging operation that creates a bent edge that curves inward in the center.
swaging Another term used for a necking operation.
tolerance The unwanted but acceptable deviation from a desired dimension. The tighter the tolerance, the greater the cost to manufacture the part.
trimming A shearing operation that removes an uneven section from the top rim of a previously worked part. Trimming operations typically follow drawing operations of sheet metal.
V-bending A bending operation performed by compressing the sheet metal between a matching V-shaped punch and die.
wiping die The tool used in an edge bending operation that provides the corner over which the extended portion of sheet metal is bent.