一、前言我厂用铝合金阶段变断面型材加工零件的过程中,经常发现加工表面的硬度偏低和阳极化处理后表面颜色不一致,在抽查性复验中,也常发现同一批型材中部分型材性能偏低。因此,我们从81年4月开始,对铝合金阶段变断面型材的大头端(加工部位)进行了复验,到10月为止,共复验19批,其中有9批不同程度地有性能偏低,同一批中部分型材低于标准极 I. Introduction I plant with aluminum alloy cross-section profile processing parts of the process, often found that the hardness of the processing surface is low and the color of the surface after the anodized inconsistency in the random inspection, often found in the same batch of profiles in the part Profile performance is low. Therefore, starting from April, 81, we conducted a retest of the bulkhead (processing part) of the deformed aluminum alloy section. Until October, a total of 19 batches of rehearsals were carried out, of which 9 batches had varying degrees of performance Low, part of the same batch of profiles below the standard pole