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6.6.2 Lubrication in Drawing
During deep drawing, different lubrication conditions
exist, from hydrodynamic lubrication in the blank holder to boundary
lubrication at the drawing radius, where breakdown of the film very often
occurs. Lubrication in deep drawing is important in lowering forces, increasing
drawability, reducing wear of the tool, and reducing defects in the workpiece.
Lubricant selection is based on the difficulty of the operation, the type of
drawing operation; and the material; recommendations are given in Table 6.5. In
this table, a
mild
operation
typically is a shallow draw on low-carbon steel, a
medium
operation is a deep draw
on lowcarbon steel, and a
severe
operation is a cartridge-case draw or a seamless
tube draw.
Table 6.6 Lubricants
commonly used in deep drawing processes.
Copyright (C) 2004
Industrial Press, Inc
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Copyright (C) 2004 Industrial Press, Inc