【文章內(nèi)容簡(jiǎn)介】 改善板形；影響速度，增加針孔。減少穩(wěn)定針孔；易造成松卷。速度增加提高產(chǎn)量；精軋暗面質(zhì)量下降。減少提高板面質(zhì)量；影響產(chǎn)能。精軋壓下率增加提高產(chǎn)能；影響板面質(zhì)量，增加針孔。減少減少針孔，改善板面；降低產(chǎn)能。軋制力增加恒軋制力生產(chǎn)，大軋制力會(huì)造成開(kāi)縫斷帶。減少恒軋制力生產(chǎn)，小軋制力生產(chǎn)易于提速，提高產(chǎn)量，易造成緊邊斷帶。張力增加改善板形；影響速度，增加針孔。減少穩(wěn)定針孔，易于提速，增加產(chǎn)能；易造成松卷和斷帶甩卷。速度增加增加產(chǎn)能；板面質(zhì)量下降，增加針孔、帶油等缺陷。減少提高板面質(zhì)量，減少針孔。降低產(chǎn)能。分切張力增加要求恒張力生產(chǎn)。大張力會(huì)造成起杠等缺陷。減少要求恒張力生產(chǎn)。小張力會(huì)造成卷密度不足，造成退火后起杠。速度增加要求恒速生產(chǎn)，高速能增加產(chǎn)能，會(huì)增加斷帶，斷面質(zhì)量下降。減少要求恒速生產(chǎn)，低速會(huì)降低產(chǎn)能。退火溫度增加高溫退火利于除油，鋁箔表面潔凈，提高延伸率。但易造成粘連，起泡。減少低溫退火鋁箔不易粘連、起泡。但易發(fā)生帶油、鋁箔復(fù)合后易破裂等缺陷。時(shí)間增加增加退火時(shí)間會(huì)改善除油效果，提高性能質(zhì)量，但易造成粘連、起泡，增加能耗。減少減少退火時(shí)間，改善粘復(fù)性，節(jié)能。但易造成帶油等缺陷。COMALCOFOIL DIVISIONDEFECT CATALOGUEDanyang Training VisitMay 1992Comalco Aluminium Ltd SMP Yennora Words Page 1 of xxxFoil Division Date Standard Metallurgical Practices Prepared by: C. ClearyFoil Division Defect CatalogueScopeThis . is for all foil personnel and covers the description and classification of various defects found in the Foil Division. It describes defects which occur during rolling, slitting and annealing.This catalogue describes the defect, why it occurs and when possible, tells you how to eliminate it.The numbering system follows the Comalco Claim System used site wide for categorizing claims from external customers (see page 2 and 3 for a full listing).This . covers the following defects: Stickiness Orange Peel Exploded Areas Wettability Hot Spots Tension Cuts Water Stain Herringbone Line of Holes Roll Holes Chatter Mill Lines Bruised coil Indents Splits Dross Staining Chicken Tracks Broken Matte Streaky Matte Step Outs Telescoping Out of Round Edge Cracks Laminations BridgingFULL LISTING OF SITE WIDE DEFECTS Annealing Stickiness Orange Peel Exploded Areas Wettability Dimensional Gauge Width Lateral Bow Length Flatness Hot Spots Creasing Edge Burr Mass Tension Crease Surface Water Stain Metal Surface Herringbone Line of Holes Roll Holes Chatter Mill Lines Bruised Coil Indents Splits Surface Condition Applied Coating Surface Contamination Dross Staining Blade Marks Chicken Tracking Broken Matte Streaky Matt Metallurgy Alloy Mechanical Properties Earing Inclusion Failure To Form Cans Document Specification Planning Sales Packaging Identification Coil Condn Loose Wraps Broken Welds Step Outs Telescope Out of Round Coil Size Broken Edge Edge Cracks Laminations Edge Damage Handling Damage Bridging Transport Seafreight Road/Rail Acc Reject No Defect BU/CP Wrecks StickinessWhat is stickiness?Stickiness is a measure of how difficult it is to pull a single layer of foil from the coil. This defect can cause problems, especially when it occurs in light gauge foils such as insulation and flexible packaging metal.When does stickiness occur?When the annealing process is out of specification or the wrong annealing cycle has been used for a particular product if the metal is kept at the incorrect temperature.Why does stickiness occur?* incorrect conditions in the annealing furnace:any residual rolling oil left from the rolling process can polymerise and form weak bonds with the meta.What can you do about it?* monitor the annealing cycle closely and watch the:heat up ratesoak timetemperaturecool down rate。* report any furnace problems. burner failure。* keep excess coolant carryover to a minimum.STICKINESS DESCRIPTIONSTICKY COILWeights Added IT REQUIRES FORCE TO PULL THE SINGLE SHEET FROM THE COILFREE UNWIND COIL THE METAL SHEET EASILY FALLS AWAY FROM THE COIL UNDER ITS OWN WEIGHT Orange Peel EffectWhat is orange peel effect?Orange peel effect is a change in the surface of the metal. It bees mottled, like the surface of an orange peel. This defect is always associated with high stickiness levels (see ).When does orange peel effect occur?This defect mainly occurs on medium gauge coils (30 to 70 microns) and of a soft alloy and O Temper.Why does orange peel effect occur?* too much coolant left on the coil:during annealing, the excess coolant between the foil layers forms a vapour.the pressure from the vapour deforms the foil in localized pockets.What can you do about it?Mini