01 ih - stamping fundamentals
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Oscar Olvera
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} Automotive} Transport} Military} Railway} Aircraft} Household
appliances} Navy
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} Is a manufacturing processthat cuts and forms sheetmetal into a desired shapeor profile, without chipremoval.
} The stamping pressprovides the power totransform the material
} The stamping dies give the
desired shape or profile.
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Die
Process
Part
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} Is a cold-forming operation, which means that noheat is introduced into the die or the sheet materialintentionally.
} The stamping die's cutting and forming sectionstypically are made from special types of hardenablesteel called tool steel or wear-resistant materials.
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} High productivity} Fast tool depreciation} Part repeatability} Part low cost} Easy to automate
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} Sheet metal is the engineering material most used for themanufacturing of products in all industry fields.
} It is the ideal material, due to the following characteristics:? Easy manufacturing? Forming capacity? Low cost? High productivity
} Sheet metal parts produced by stamping can replaceparts produced by sinterig, welding and casting.
} With the following benefits.? Lower weight (ligther)? Higher mechanical strength? Lower cost? Higher productivity (more parts/hr). notable
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} Large dimensions parts can be produced from sheetmetal by stamping allowing great plastic deformation,without material removal.
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Punching
Profiling
Drawing
BendingShearing
Blanking
} Cutting? Punching? Shearing? Blanking? Others (Notching, Trimming,
Slitting)
} Forming? Bending
? Drawing? Others (Flanging, Spinning, Profiling)
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} The sheet metal, positionedbetween two dies, is severed asthe die cutting edges move pasteach other.
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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 formingoperations.
}
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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 controllingsheet metal flow into a cavity andover a punch.
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} Is a special, one-of-a-kind precision tool that cuts and formssheet metal into a desired shape or profile as the sheet metal ispressed, or stamped, between two mating components.
} A die gets the force it needs from a press.
} Dies range in size from those used for making microelectronicscomponents, to those used for making entire autobody sides.
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Die type?
Material(Type, consumption)
Part Size,Shape and Tol.
ProductionVol., speed
Equipment,$$$, etc.
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Transfers Progressive
Single-station
Dies
} Each station that forms or cuts thesheet metal represents a singleoperation die.
} Tools that typically are hand orrobotically loaded.
} Low-production parts
} Production of parts that are toobig and bulky to handle withautomation.
} Large line dies are placed in
individual presses
} Small line dies can be placedwithin a single press.
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Cutting dies
} Advantages:
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Drawing die} Disadvantages:
? Lower productionspeeds
? Require expensiverobots or human labor.
? Several presses tomanufacture a singlepart.
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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 pitch.
} Piece parts are transferred byspecial traveling rails mountedwithin the press boundaries.
} Transfer systems can performnumerous motions. The twobasic types are 2-D (two-axis)and 3-D (three-axis).
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Parts
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7 89 10 11
1. Embutir.2. Reducir
embut.3. Reducir
embut.4. Perfilar.5. Calibrar.
6. Perforar.7. Recortar8. Punzonar.9. Agujerear.10. Bordonar.11. Cortar.
} Is one of the most common, fastest methodsavailable for producing piece parts.
} Parts are tied together by a portion of theoriginal strip or coil, called a strip carrier.
} Can produce as many as 1,500 parts perminute.
} All necessary stations are mounted on a singlecommon die set.
} Stations are timed and sequenced so that thepiece part can be fed ahead a constant givendistance called the progression or pitch.
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No blank-holderPart insufficient flatness
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No blank-holderPart insufficient flatness
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Blank-holderBetter part flatnessAll types of operations
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All types of operations
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} Die plates are steel or aluminum 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 within a criticaltolerance.
} The machining methods are milling andgrinding.
} The upper and lower die shoes
assembled together with guide pinscreate the die set
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} Align the upper andlower die shoes precisely.
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} Precision-groundcomponents, oftenmanufactured within0.0001in (0.002 mm)
} There are two basic typesof guide pins andbushings:? Friction pins? Ball bearing-style pins.
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Cutting
Stripping pad
Die
Sheet
Stripping force
Bending
Drawing
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} Springs supply the force needed to hold,strip, or form metal.
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TOOL HOLDER (PORTA PUNZONES):Materialss: Steels: F111 - F112 -F114
TOOL GUIDE (GUA PUNZONES):Materiales: Ac. F111 - F112 F114
TOOL HOLDER (PORTA MATRICES):Materiales: Ac. F111 - F112 F114
BLANK HOLDER PAD (PISADOR):Materiales: Ac.: F112 F114 HTF522 HT (CEMENTADO)GUIDE PINS (ELEMENTOS
GUA)Materials: Steels: F151-F152 Cementado T. y R.Bronze + Graphite
DIES (MATRICES):Materials: Steels : F521 F522 HT1.2379 - 1.3343+T y R. + PVDWidia (Metal duro)TEMPERED ANNEALED60 -64 Rc
PUNCHES:Materials: Steels: F521-F5221.2379 1.3343+T y R + PVDWidia (Metal duro)TEMPERED ANNEALED,60 -64 Rc
LOWER PLATE (BASE INFERIOR):Materials: Casting GG25Steels: F111 F112
UPPER PLATE (BASE SUPERIOR):Materials: Casting GG25Steels: F111 F112