dmh stamping fundamentals bn
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Oscar Olvera
} Is manufacturing processthat cuts and form s sheetmetal int o a desired shapeor profile, without m aterialremoval.
} The stamping pressprovides the power totransform t he material
} The stamping d ies give thedesired shape or prof ile.
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Die
Process
Part
} Is a cold- forming operati on, which means that noheat i s intr oduced int o the die or the sheet materialintentionally.
} The stamping die's cutt ing and form ing sections
typi cally are made from special t ypes of hardenablesteel called tool steel or wear- resistant materials.
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} High productivity} Fast tool depreciation} Part repeatabili ty} Part low cost} Easy to automate
} Sheet metal is the engineering material most used for themanufacturing of products in al l industry fields.
} It is the ideal material, due to the following characteristics:? Easy manufacturing? Forming capacity? Low cost
? High productivity
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} Sheet metal parts produced by stamping can replaceparts produced by sinterig, welding and cast ing.
} With the following benef i ts.? Lower weight (ligther)? Higher mechanical strength? Lower cost? Higher productivity (more parts/ hr). notable
} Large dimensions parts can be produced from sheetmetal by stamping allowing great plastic deformation,without material removal.
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} Automotive} Transport} Military} Railway} Aircraft} Household
appliences} Navy
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Punching
Profiling
Drawing
BendingShearing
Blanking
} Cutting? Punching? Shearing? Blanking? Others(Notching, Trimming ,
Slitting)
} Forming? Bending? Drawing? Others (Flanging, Spinning, Prof iling)
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} The sheet metal, positionedbetween two dies, is severed asthe die cutting edges move pasteach ot her.
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} Forming operations deform sheetmaterial by exposing it to tension,compression, or both.
} Most part defects, such as splits andwrinkles, occur in f ormingoperations.
}
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} Forming operation in which the metalis plastically deformed along astraight axis.
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Punch
Die
Sheet
} Metal forming process in which thepart shape is formed by control lingsheet metal flow into a cavity andover a punch.
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} Is a special, one- of- a- kind precision tool that cuts and form ssheet metal into a desired shape or prof ile as the sheet metal ispressed, or stamped, between two mating component s.
} A die gets the fo rce it needs from a press.
} Dies range in size from t hose used for making microelectroni cscomponents, to those used for making entir e autobody sides.
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Die type?
Material(Type, consumption)
Part Size,
Shape and Tol.
Production
Vol., speed
Equipment,
$$$, etc.
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Transfers Progressive
Single-station
Dies
} Each station t hat form s or cuts t hesheet m etal represents a singleoperation die.
} Tools that typically are hand orrobotically loaded.
} Low-production parts
} Production of parts t hat are toobig and bulky to handle withautomation.
} Large line dies are placed inindivid ual presses
} Small line dies can be placedwithi n a single press.
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} Line dies that are timedtogether and spaced an evendistance apart in a singlepress.
} The distance between each dieis referred to as the pi tch.
} Piece parts are transferred byspecial traveling rails moun tedwithin the press boundaries.
} Transfer systems can perfo rmnumerous moti ons. The twobasic types are 2 - D (two- axis)and 3- D (three- axis).
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Parts
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9 10 11
1 . Em but ir.2 . Reducir
embut.3 . Reducir
embut.
4 . Perf il ar .5 . Cal ib rar .6 . Per fo rar .7 . Recor tar8 . Punzonar .9 . Ag uj er ear .10. Bordonar.11. Cortar.
} Is one of the most common, fastest methodsavailable for pr oducing p iece parts.
} Parts are tied together by a port ion of theoriginal strip or coil, called a strip carrier.
} Can prod uce as many as 1,5 00 p arts p erminute.
} All necessary stations are mounted on a singlecommon die set.
} Stations are tim ed and sequenced so that thepiece part can be f ed ahead a constant given
distance called the prog ression or pit ch.
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No blank- holder
Part insufficient flatness
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No blank- holder
Part insufficient flatness
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Blank- holder
Better part flatnessAl l types of operat ions
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All types of operat ions
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} Die plates are steel or alum inum platesthat correspond to the size of the die.
} They serve as the foundation formounting the working die components.
} Must be machined so that they areparallel and flat wi thin a criticaltolerance.
} The machining m ethods are milling andgrinding.
} The upper and lower die shoesassembled together with guide pinscreate th e di e set
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} Align the upper andlower die shoes precisely.
}
} Precision- groundcomponents, oftenmanufactured within0.0001in (0.002 mm )
} There are two basic types
of gu ide pins andbushings:? Fricti on pins? Ball bearin g- style pins.
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} Springs supply the force needed to hold,strip, or form metal.
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BASE SUPERIOR:Materiales: Fundicin GG25Aceros: F111 F112(Oxicorte)
PORTA PUNZONES:Materiales: Ac.: F111 - F112 -F114
GUA PUNZONES:Materiales: Ac. F111 - F112 F114
PISADOR:
Materiales: Ac.: F112 F114 T.y R.F522 T.yR.
PORTA MATRICES:Materiales: Ac. F111 - F112 F114
BASE INFERIOR:Materiales: Fundicin GG25Aceros: F111 F112(Oxicorte)
MATRICES:Materiales: Ac. : F521 F522 T. y R.1.2379 - 1.3343+T y R. + PVDWidia (Metal dur o)
ELEMENTOS GUAMateriales: Ac.: F151-F152 Cementado T. y R.Bronce/ Ac. + Grafito
PUNZONES:Materiales: Ac.: F521- F5221.2379 1.3343+T y R + PVDWidia (Metal duro)
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