Demands for better drawability and movement towards zero defects in copper conductors are expected to continue.
2.
:: Please see the RFC I linked where the'argument-from-drawability'was roundly rejected.
3.
In such cases, any press-forming subject to r45 does not assist in an improvement in said deep-drawability.
4.
In such cases, any press-forming process design on the basis of R _ { 45 } does not lead to an improvement in deep-drawability.
5.
When the Lankford value is raised in the prior art, ?r also tends to be high, that is to say, the actual deep-drawability is not improved in proportion to the average Lankford value.
6.
However, in the actual press-working, said deep-drawability of steel sheets cannot be determined only by the value of r, which quality is assumed to result from ?r, i . e ., planar anisotropy, in many cases.
7.
Lankford value, e . g ., normal anisotropy and the like . The values affect significantly the qualities of the steel for press-working . Generally, the Lankford value of cold rolled steel sheet acting for deep-drawability shows heavy orientation, and such deep-drawability is determined by r, that is, the average value of ro, r45, and r90, which are the Lankford values at 0? 45?and 90?to the rolling direction . r is obtained from the following formula:
8.
Lankford value, e . g ., normal anisotropy and the like . The values affect significantly the qualities of the steel for press-working . Generally, the Lankford value of cold rolled steel sheet acting for deep-drawability shows heavy orientation, and such deep-drawability is determined by r, that is, the average value of ro, r45, and r90, which are the Lankford values at 0? 45?and 90?to the rolling direction . r is obtained from the following formula:
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