一、鋁合金板材形狀偏差現狀
　　1、 Shape deviation of aluminum alloy sheet鋁合金帶材典型的板形偏差為:軋制產品為50I，矯直產品為10I。目前，高技術冷軋機具有冷軋帶鋼形狀的自動控制系統，使帶鋼的粗糙度從30I提高到10I。
　　The typical shape deviation of aluminum alloy strip is 50i for rolled products and 10I for straightened products. At present, the high-tech cold rolling mill has an automatic control system for the shape of cold rolled strip, which improves the roughness of strip from 30i to 10I.
　　影響鋁合金板厚偏差的因素

　　Factors affecting thickness deviation of aluminum alloy plate鋁合金板材的橫向厚度偏差稱為橫向厚度差(板冠)，可以忽略板材邊緣減薄的影響。橫向厚度差是由板的橫截面形狀決定的。矩形截面的橫向厚度差為零，是用戶所期望的理想情況。楔部分另一邊厚一邊薄,和橫向差異主要是由于雙方壓力調整不當,或滾動流失一部分。對稱凸或凹部分顯示中間部分的厚度和中間部分的厚度和中間部分的厚度。在大多數情況下，中間厚度兩側較薄，橫向厚度差主要是由軋制過程中軋輥間隙的形狀引起的，即金屬的縱向伸長沿橫向分布不均勻。如果不考慮軋件的彈性恢復，可以認為鋁合金板的橫向厚度差實際上等于工作輥縫在板寬范圍內的開度差。
　　The transverse thickness deviation of aluminum alloy plate is called transverse thickness difference (plate crown), which can ignore the influence of edge thinning. The transverse thickness difference is determined by the cross section shape of the plate. The transverse thickness difference of rectangular section is zero, which is the ideal situation that users expect. The other side of the wedge is thick and the other side is thin, and the difference between the two sides is mainly due to improper pressure adjustment or rolling loss of a part. The symmetrical convex or concave part shows the thickness of the middle part and the thickness of the middle part and the thickness of the middle part. In most cases, both sides of the middle thickness are thin, and the transverse thickness difference is mainly caused by the shape of the roll gap in the rolling process, that is, the longitudinal elongation of the metal is not evenly distributed along the transverse direction. If the elastic recovery of the rolled piece is not considered, it can be considered that the transverse thickness difference of the aluminum alloy plate is actually equal to the opening difference of the working roll gap in the wide range of the plate.
　　橫向厚度差或板凸度通常用軋件中間部分的厚度與軋件橫截面邊緣的厚度之差來表示。為了提高軋制件的穩定性和對中性，有時需要在帶鋼截面上有一定的凸度，但這會降低橫向厚度的精度，特別是對帶鋼而言。
　　The transverse thickness difference or plate crown is usually expressed as the difference between the thickness of the middle part of the rolled piece and the thickness of the edge of the cross section of the rolled piece. In order to improve the stability and neutrality of rolled products, it is sometimes necessary to have a certain degree of convexity on the section of strip steel, but this will reduce the accuracy of transverse thickness, especially for strip steel.
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