Snmek 1
Anglicky v odbornch pedmtech"Support of teaching technical
subjects in EnglishTutorial: Engineering technology
Topic: Volume forging- drawing of wires and profiles
Prepared by: Ing. Elena Nov
Projekt Anglicky v odbornch pedmtech, CZ.1.07/1.3.09/04.0002je
spolufinancovn Evropskm socilnm fondem a sttnm rozpotem esk
republiky.
Volume forging- drawing of wires and profiles
Drawing tools are stationary drawing dies and gauges very
abrasion stressed. Steel wire dies have about 2000kg of drawn
material lifespan. If made from hardened steel lifespan is about
200 times bigger. Diamond dies are nearly indestructible. Wires to
diameter of 1.5 mm are made from hardened steel (sintered
carbides). Volume forging- drawing of wires and profiles.
Drawing die consists of more cones with different top angles.
Their function is as follows: Entry cone (introducing) is a cone
with angle of opening 45 to 60o, lubricating the same angle,
drawing cone with angle 10 to12o, calibration and exit cone.
Scheme of drawing die:Volume forging- drawing of wires and
profiles.
Drawing dies are either single or multiple.As a lubricant is
used an emulsion of phosphates, borax, soap powder etc. Diameter of
hole equals to required profile. Volume forging- drawing of wires
and profiles.
Wire drawing is divided into following technological
procedures:Simple drawing Drawing with reverse motion (one
direction drawing + reverse die draw (minimize drawing force and
temperature), Step drawing (deformation is distributed into more
steps requires higher drawing energy). Hot drawing steels with
lower forming ability, Drawing at lower temperatures (achieving of
higher strength)
Volume forging- drawing of wires and profiles.
Machines used for drawing wires, profiles or rods are called
(drawing mills, non-reversible mills). Plough rod mill:
Mill with linear stroke (carrier chain with jaws moves on a
frame). Drawing speed is between 30 to150 m.min-1 length about 60 m
max. Lubrication is provided during drawing by a pressure greaser
unit. Volume forging- drawing of wires and profiles.
Drawing Mill with linear movement. Volume forging- drawing of
wires and profiles.
Other drawing mills: 2. Wire coiling mill:
Volume forging- drawing of wires and profiles.
Wire coiling mills are:
1. single pass
2. multiple pass Volume forging- drawing of wires and
profiles.
Accordingly to process 1. Slip less mill2. Mill with slip
Mill has few wire coils on the drum preventing slipping. Mill
with slipping creates an excessive heat which must be removed.
Volume forging- drawing of wires and profiles.
Scheme of slip less and slipping mill. Volume forging- drawing
of wires and profiles.
What is called a drawing tool?What material is used for
production?Describe cone function.Lubrication used for drawing
dies?What is the name of units used for wire drawing and how are
they divided?Answer the questions:
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