manufacturing processes

1. Metal Drawing
Prof. K.N.Wakchaure
Dept. of Mechanical Engineering
SRES COLLEGE OF ENGINEERING,
KOPARGAON

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25. Drawing Process
Extrusion Process

26. • In theory the highest possible amount of area reduction,
based on preventing yielding of the work is usually about
63%.
• In industrial practice area reductions generally range from
15% to 45%.
• In order to obtain greater reductions in cross sectional area,
the work may be drawn through two or more drawing die in
series. Metal drawing often involves round profiles.

29. Production Of Hollow Tubes And
Drawn Shapes

31. Wire Drawing
• Wire drawing is the second major category of metal drawing operations.
While rod and bar drawing refer to the drawing of larger cross sections,
wire drawing refers to the drawing of relatively smaller cross sections.
• The enormous amount of electrical wire and cable produced by this method
makes wire drawing a major modern industrial process.
• Some wire must be manufactured to tremendously small cross sectional
areas, such as those used in electromagnets.
• Wire may be drawn to diameters as low as .0001 inch. Diamond die
inserts are often used in the production of extremely fine wire.
• Typically drawing speeds may be 20-100 feet per minute, but in some cases
wire may be drawn at 10,000 feet per minute.
• Industrial wire drawing operations can manufacture miles of wire at a time.

33. Analysis of Drawing

35. • But practically, always there is friction between die & work
material.
• Considering effect of friction, die angle, Coeff. Of friction etc., the
drawn stress is given by,

36. • From geometry,