CAJ | 학술논문

厚规格铝压型板具有重量轻和比强度高等优点，也使其成型过程载荷增大、横向位移增加，成型难度增大。通过分析材料性能和成型工艺的特点，成功开发了厚规格铝压型板辊弯顺序成型工艺，给出了各道次压下规程和轧轮轴向横移量，并对少量压型板角部裂纹缺陷进行了断口SEM和EDS分析。研究发现裂纹断口是典型的微孔聚合型断裂形貌，韧窝内大多包含有夹杂物或第二相颗粒，裂纹多萌生于Al6（ FeMn）等硬化相或夹杂物与基体的界面上。通过预退火处理和减慢加工速率等措施可以降低板材加工硬化、提高塑性成形能力，减少裂纹缺陷的发生。
후규격려압형판구유중량경화비강도고등우점，야사기성형과정재하증대、횡향위이증가，성형난도증대。통과분석재료성능화성형공예적특점，성공개발료후규격려압형판곤만순서성형공예，급출료각도차압하규정화알륜축향횡이량，병대소량압형판각부렬문결함진행료단구SEM화EDS분석。연구발현렬문단구시전형적미공취합형단렬형모，인와내대다포함유협잡물혹제이상과립，렬문다맹생우Al6（ FeMn）등경화상혹협잡물여기체적계면상。통과예퇴화처리화감만가공속솔등조시가이강저판재가공경화、제고소성성형능력，감소렬문결함적발생。
The thick profiled aluminum alloy sheets have the advantages of light weight and high specific intensity. However, the profiled sheets are difficult to form because of the increase of the deformed force and shifting dis-placement. The roll forming technology of the thick profiled Al alloy sheet was developed by analyzing the features of the roll forming and formability of the metal. The reduction schedule and shifting displacement of each pass were presented, and a few defects at the corner crack were analyzed by the fracture SEM and EDS. Research shows that the fracture is a typical micro-porosity convergent morphology. There are some inclusions and second phases in the dimples, and the cracks are mainly initiated at the interface between the Al6( FeMn) hardened phases, inclusions and the aluminum alloy matrix. The pre-heat treatment and the reduction of the deformation rate can reduce the work hardening, improve the formability of the Al alloy sheet, and reduce the crack defects.