A MODIFIED METHOD FOR LATERAL SPREAD IN THIN STRIP ROLLING

A rolling method lo increasc [he width of the metal would 'twx
advantages lnulii pass strip pr ndtlctiol~? giving high producl i vii y
and control of ;exmrc oi. planz- aisotropy. In coi~vei~tioional flat
rolling, however. it is ilifkiilt to produce metal fl~w iin the lateral
direction. A new method tor spread rolling has bee^ proposed in
.the literature, in which severai portions of strip width are roiied
between a roll that has 22a11y circumferential grooves and a fiat
roll. In the present work, new modifications in roil profile and
rlurrlhrr of grooves are irlinduced. The advantages of the new
1.r- AS? A UL~ are e iiiiough rolling of pure commercial
alumimm sti-ips. It is found that a strip of 70 mrn wide and I mm
thickness twc been widened up to 3.1% under a reduction c;f
35%. It is tbuzd also that the planar anisotropy decreases. A
special pur;lvsr nonlinear ilrde element progrm has been
developed to deal with continuous change of contact berween the
roll and the strip in each roiling pass. The calcuimd smin tensor
is utilized to investigate the iocdi~eci necking.