一、铝合金板材形状偏差现状
　　1、 Shape deviation of aluminum alloy sheet铝合金带材典型的板形偏差为:轧制产品为50I，矫直产品为10I。目前，高技术冷轧机具有冷轧带钢形状的自动控制系统，使带钢的粗糙度从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.
　　影响铝合金板厚偏差的因素

　　Factors affecting thickness deviation of aluminum alloy plate铝合金板材的横向厚度偏差称为横向厚度差(板冠)，可以忽略板材边缘减薄的影响。横向厚度差是由板的横截面形状决定的。矩形截面的横向厚度差为零，是用户所期望的理想情况。楔部分另一边厚一边薄,和横向差异主要是由于双方压力调整不当,或滚动流失一部分。对称凸或凹部分显示中间部分的厚度和中间部分的厚度和中间部分的厚度。在大多数情况下，中间厚度两侧较薄，横向厚度差主要是由轧制过程中轧辊间隙的形状引起的，即金属的纵向伸长沿横向分布不均匀。如果不考虑轧件的弹性恢复，可以认为铝合金板的横向厚度差实际上等于工作辊缝在板宽范围内的开度差。
　　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.
　　横向厚度差或板凸度通常用轧件中间部分的厚度与轧件横截面边缘的厚度之差来表示。为了提高轧制件的稳定性和对中性，有时需要在带钢截面上有一定的凸度，但这会降低横向厚度的精度，特别是对带钢而言。
　　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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