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hammer steel
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See hem steel.
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handling core
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Cast cores in upper and lower shoes used for handling purposes.
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handling hook
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See turnover.
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handling ring
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A device bolted to the side of a mold die for handling of the mold.
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hartmann lines
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See Luders lines.
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heel block
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(1) A block or plate usually mounted on or attached to a lower die and serving to prevent or minimize deflection of punches or cams.
(2) When heel blocks are used with a mating heel post, this assembly can be used alone or in conjunction with guide pins. This helps align
the die to prevent damage when the press ram has too much play.
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heel plate
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A wear plate used on the heel block. See also wear plate and heel block.
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heel post
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A male member that has either a machined wear surface or wear plates mounted to it that mates with a heel block. It is incorporated in dies
to hold the die alignment and absorbs lateral pressures produced within the die.
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hem clearance mismatch
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(See Figure H1)
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hem curved outboard
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Shown as HCO. (See Figure H2)
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hem deflection (sag)
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Shown as D. (See Figure H3)
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hem die
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Die used in hemming. (See Figure H4)
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hem die plus
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The amount of stock added to a part in an area to be hemmed to compensate for the amount the part reduces in size along the flange radius when
hemmed. Also see creep.
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hem edge roll
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When the outer panel rolls up off of the hem die during the hemming process. (See Figure H5)
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hem flange split
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Usually observed in concave edge and concave surface flanging and hemming. (See Figure H6)
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hem length
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The length of the flange after final hemming. Shown as Lhem in Figure H7.
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hem level mismatch
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Figure not available.
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hem out
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Usually observed with wrinkling after flanging or pre-hemming. Severe wrinkles in convex edge hemming may develop hem-out. (See Figure H8)
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hem steel
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The steel in a hem die that finishes and flattens the hem. Also called hammer steel.
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hemming
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A bend of 180' made in two steps. First, a sharp-angle bend is made; next, the bend is closed using a flat punch and a die.
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hemming die
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A die which folds the edge of the part back over on itself. The edge may or may not be completely flattened to form a closed hem.
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herf
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A common abbreviation for high energy-rate forging or high-energy-rate forming.
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high collar lock washer
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A special type of lock washer that is thicker than standard and smaller in diameter than standard. Designed to fit in a standard counterbored
hole for a socket head cap screw.
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high-energy-rate forming
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A group of forming processes that applies a high rate of strain to the material being formed through the application of high rates of energy
transfer. See also explosive forming and electromagnetic forming.
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hoist ring
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See swivel ring.
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hold down
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An object used to secure a workpiece.
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hold-down plate (pressure pad)
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A pressurized plate designed to hold the workpiece down during a press operation. In practice, this plate often serves as a stripper and
is also called a stripper plate.
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hole flanging
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The forming of an integral collar around the periphery of a previously formed hole in a sheet metal part. See extruding.
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homing the die
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Adjusting press ram/slide so die is on bottom or on the stop blocks at the bottom of the press stroke. Also called bottoming the die.
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hone
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A fine grit stone used with a fluid for sharpening or smoothing a surface. Also see superior hone.
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hone bucket
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A container which holds cleaning and lubricant fluids for wet hones. Also called minnow bucket.
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hooke's law
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A material in which the stress is linearly proportional to strain is said to obey Hooke's law. See also modulus of elasticity.
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horizontal cam
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See straight cam.
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horn
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(1) Lower section of the die on which the part nests. Also called an adapter, boss, die post, locator, master, master plug, and stool. (2) A
portion of the die or part that protrudes.
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hot developing
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The development of a blank or part during the tryout of the die.
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hot shear
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A term used for a quick fix of a trim steel that should only be done in an emergency situation. It is done by welding the steel and roughing
it back close to the original surface. Next the steel is reheated until it becomes molten red and then the press is cycled to get the location of the mating surface. Die clearance must be
added after this location is obtained.
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hydraulic press
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A press in which fluid pressure is used to actuate and control the ram.
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hydraulic press brake
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A press brake in which the ram is actuated directly by hydraulic cylinders.
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hydraulic shear
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A shear in which the crosshead is actuated by hydraulic cylinders.
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hydraulic-mechanical press brake
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A mechanical press brake that uses hydraulic cylinders attached to mechanical linkages to power the ram through its working stroke.
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hyson cylinder
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See gas cylinder.
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