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Advance -
The amount that a strip or part
moves forward in a progressive
stamping operation. Also called
Jump.
Blank Die - A type of
cutting tool in which the die
matrix is mounted in the lower
with a single punch in the
upper. Generally, a blank die
has no internal features and the
part in passed down through the
lower die.
Carrier Strip -
“Sacrificial” stock used in a
progressive stamping operation
that carries the part from
station to station. The carrier
is linked to the part and
eventually becomes scrap once it
is cut-free.
Compound Die - A type of
cutting tool in which the die
matrix is mounted in the upper.
I compound die has a lower
mounted contour punch and upper
mounted perforators and punches
for internal features. This is
an inverted form of a Blank Die
with additional internal holes.
Die Land -
The amount of “straight” in a
die matrix that exists for
sharpening before the relief
taper begins. Typically this is
about 1/8” to 1 /4”.
Die Life - Die Land
expressed as “grind life” or
“re-sharpening life”.
Die - 1. A matrix within
which a punch creates an opening
in a part. 2. A block against
which work
is done.
*The die is usually mounted in
the lower and is the fixed
element.
Die
Penetration - The amount
that a punch penetrates a die
during a stamping operation.
Typically this is about .050”.
Die Straight - See Die
Land. Refers to the
“Straight” portion of a die
profile.
French Stop - See
Fringe Stop. A misnomer for
Fringe Stop.
Fringe Stop - In
progressive stamping, a stop
that is “at the fringes” of the
carrier strip. This stop is a
fixed point that will stop the
forward progress of a strip once
the strip has been notched away.
The notch length is typically
one stock advance. Sometimes
called a “French Stop”.
Heel Block - A tooling
component used for heeling.
Heel - A “metal-to-metal”
condition between two blocks in
a tool used to control or
balance imbalanced forces.
Heel Radius - A radius
provided on a tooling
component(s) that prevents two
blocks from shearing against
each other when they are used to
contain forces.
Heel - To contain forces
via a heel block or similar
“metal-to-metal” technique.
Knock Out Bar - A press
component that straddles the ram
in the punch press that is used
for “positive knock out”.
Knock Out - A tooling
component that ejects a part
from a matrix (like in a
compound die) or a punch (as in
a form die)
Knock Out - A plate in a
tool that that distributes force
(typically via pins)
Plate - for the purposes
of “knock out”.
Lift - To lift stock via
a lifter.
Lifter - A feature in a
tool that lifts the stock as it
conveys through a progressive
die. Often used to lift the past
over lover tooling features.
Matrix - See Die –
strictly speaking a matrix is a
tooling component into which a
punch is entered to create a
part or slug.
Notch - A part feature
that is cut into a (typically)
straight edge.
Notch - The process of
creating a part feature that is
cut into a (typically) straight
edge.
Perf - Short for
perforator.
Perforator - A punch that
is fitted to a regular shaped
body, most likely a round body
with a head.
Pilot - A feature in a
tool that locates a part or
strip between operations.
Similar to a locator, but used
in progressive stamping tools to
assure station to station
alignment.
Pilot - To locate a part
or strip in a progressive
stamping operation via a pilot.
Positive Knock Out - A
condition in which a knock out
operation is “positive” in that
it is mechanically tied into the
end of the press stroke and acts
via a “top knock out” pin that
is integral to the punch press.
Pressure Pad - A lower
tooling element that pins the
part while work is being
performed.
Punch - 1. Part of a tool
that creates an opening. A male
feature that creates an opening,
usually in conjunction with a
female matrix (or die). 2. A
block that does the work during
a forming operation.
*Punches are usually mounted in
the upper and are the moving
element.
Punch To make a hole or opening
in a part.
Scrap - The scrap that
results from a punching
operation in general.
* Scrap includes slugs and other
associated “left-overs” from a
stamping operation.
Semi-Perf - A partially
sheared feature that leaves a
boss profile (that is the same
size as the die). Used commonly
for locating parts via a hole &
slot - these are usually round
features. Also called
half-shear.
Shedder - A tool
component that sheds a part from
a die matrix. Generally a thin
plate that sits inside of a die,
especially in a Compound Die.
Skim - To cut in a
progressively finer fashion,
typically using Wire EDM
(Electrical Discharge Machining)
specifically for the creation of
accurate size.
Skyhook - A fixed tooling
component that strips a part
from a form punch.
*Skyhooks are typically lower
mounted.
Slug - The scrap that
results from a punching
operation, the “left over”
material from a punching
operation.
* Slugs are almost always passed
through the lower die, usually
resulting from a fully profile
cut.
Stop Block - A block that
is used for setting the
reference height of a tool while
in the press so that an accurate
part may be obtained. Also
called Kiss-Blocks or
Set-Blocks. Stop blocks are
generally used in balanced sets
and are not intended to stop the
forward motion of the press ram,
but rather act as a reference
point for tool setup.
Stripper - A tool
component that strips the scrap
from a punch. Generally a thin
plate that surrounds a punch or
set of punches.
Strip - To eject scrap
(or a part) from a tooling
component, typically a punch.
Wire - Wire EDM
(Electrical Discharge
Machining): typically used for
the creation of punch and die
contours.
*Typical wire sizes range from
approximately .004” to .010”
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