Slide 2 Tutorial: Engineering technology Topic: Volume forging
Extrusion 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. Slide 3 Volume forging
Extrusion Slide 4 Extrusion is a technology which can be used at
higher, medium and cold temperatures. Forged material is moved in
directions determined by the tools construction- extrusion die.
Product is called extrusion punch. Slide 5 Extrusion technology:
Metals with low forging strength as is aluminum and its alloys can
be extruded in one operation. Steel and other metals use more
operations. Slide 6 It is necessary to treat the material by
straitening and cutting before actual extrusion. After that follows
surface cleaning and phosphate. Extrusion die consists of extrusion
punch and extrusion die. Lubricant for extrusion at higher
temperatures is glass. Cold extrusion uses oil. Slide 7 Extrusion
is divided: Hot extrusion Is used for full and hollow profiles with
difficult cross sections which cannot be made by rolling. Cold
extrusion Is used for thin walled products, cartridges, tubes,
spray cans. Production is very economic. Slide 8 Extrusion is
divided according to direction on: Forward Backward Combined
Sidewise Radial Slide 9 At forward (direct) extrusion is material
moving in the same direction as extrusion punch. It is used for
forging pivots, bolts, bushes, products with constant cross
section. Princip dopednho protlaovn (1, 3 die, 2, 4 - punch, a,
punch, b wiper, c die, d ejector) Slide 10 At backwards extrusion,
material moves in opposite direction. It is used for manufacturing
of hollow extrusions where wall thickness is very thin compared to
its diameter. Princip zptnho protlaovn 1, 3 die, 2, 4 - punch, a,
punch, b wiper, c die, d - ejector Slide 11 Combined (compounded)
extrusion Very stressed, profiled products are made in this manner.
Principle of combined extrusion 1, 3 die, 2, 4 - punch, a, punch, b
wiper, c die, d ejector) Slide 12 Side and radial extrusion At side
extrusion is material moving perpendicularly to direction of
extrusion punch. Radial extrusion is a forging where material and
tool parts are moving in radial direction to axis of extruded
product. Principle of side (left and middle) and radial extrusion
Slide 13 Hydrostatic extrusion, semi-finished product is inserted
in liquid of very high pressure. By the all- dimensional tension is
material ductility increased. Slide 14 What kinds of extrusion do
you know? Divide extrusions in accordance to flow direction.
Describe construction of extrusion tool. What material and method
do we use for cold extrusion? What material and method do we use
for hot extrusion? Slide 15 Translate and describe: Slide 16
http://www.ksp.tul.cz/cz/kpt/obsah/vyuka/s
kripta_tkp/sekce/04.htm
