Anglicky v odborných předmětech "Support of teaching technical subjects in English“ Tutorial: Engineering technology Topic: Flat forming - punching, bending Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Transcript
Slide 1
Slide 2
Tutorial: Engineering technology Topic: Flat forming -
punching, bending Prepared by: Ing. Elena Nov Projekt Anglicky v
odbornch pedmtech, CZ.1.07/1.3.09/04.0002 je spolufinancovn
Evropskm socilnm fondem a sttnm rozpotem esk republiky.
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Flat forming-punching, bending
Slide 4
3.Punching stamping sheets are pierced by shearing (die)
cutter. Its main parts are blanking punch and punching / blanking
die. Blanking punch- moving part of tool Punching die- stationary
part
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Cutting clearance between blanking punch and punching die is
axial clearance. If too big cut is rough with tear edges. Clearance
should be 0,5% of sheet thickness. Schema of cutting using cutting
tool (SK- cutting punch, SC- cutting die) ms=cutting clearance
Slide 6
Simple cutting tool First tool is simple cutter designed for
one operation. Strip position is secured by solid stop, shift by
one step (size of product plus allowance)
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With big and series production are used progressive tools.
Shift of strip is usually from right to left. Right (small)
circular blank falls to waste, from the left part of tool falls
finished product washers.
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4. Bending is a forming process where usually is material
permanently deformed at different bend angles with smaller or
bigger edge radius. For bending are use tools named bending dies
(roll and die).
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Bending principles At bending, inner part has compression and
outer side traction stresses generating plastic deformations. If
the worked material is not sufficiently ductile cracks can develop
on the outer surface!
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Seaming is edge bending either manually or using flanging
rolls.
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Roll-bending is bending between rolls. It is used at production
of cylindrical or conical tubes, casing jackets and even plates
30mm thick. Thicker plates are usually hot bended. Machines used
for this process are called bending rollers.