基于多元线性回归的6016汽车铝板FLD_0预测模型

成形极限图中FLD0(平面应变处的主应变)的准确性关系到汽车零件CAE仿真分析和安全裕度判定的精度。文章针对15种不同性能的6016汽车铝板,采用相关性分析方法研究了材料厚度、屈强比、延伸率、n值和r值等对6016汽车铝板FLD0的影响规律,并基于多元线性回归方法建立了6016汽车铝板FLD0的预测模型。

季节温度对汽车铝板冲压成形性的影响

为解决汽车铝板零件在夏季批量生产过程中的开裂缩颈问题,提升汽车铝板的成形稳定性,研究了季节温度对铝板拉延成形性的影响,通过对比分析铝板在冬季与夏季的力学性能以及汽车铝板表面原厂润滑油的粘度随季节温度的变化对铝板成形性的影响,得到了铝板表面原厂润滑油在冬季和夏季的涂油量的最佳参数。研究发现:夏季铝板表面原厂润滑油的粘度较冬季明显降低,且经过清洗机清洗后铝板表面原厂油膜残油量较冬季减少,且与冲压清洗油组成的混合油膜的粘度降低,致使铝板在拉延过程中与模具表面的摩擦因数增加,导致铝板在夏季的成形性变差。因此,夏季时适当提高铝板表面原厂润滑油的涂油量可明显降低板料表面的摩擦因数,有效提升夏季铝板成形性,消除开裂缩颈问题。

6016汽车铝板包边性能及影响因素的实验研究

包边是汽车车身覆盖件内外板装配压合过程的重要工序,弯曲极限是评估铝板包边性能优劣的重要指标。针对9种不同性能和批次的进口6016汽车铝板,进行了180°三点弯曲试验,系统研究了材料力学性能、时效时间和预拉伸量对6016汽车铝板包边性能的影响规律,为现场质量和工艺控制提供了重要依据。研究结果表明,材料伸长率和硬化指数对6016汽车铝板的弯曲性能无明显影响,材料各向异性、时效时间和预拉伸量对6016汽车铝板的包边性能有明显影响。

MF和EDT表面对汽车铝板的成形性能影响试验

汽车铝板常见的两种表面形貌MF表面和EDT表面对汽车铝板的性能尤其是冲压成形性能影响较大。选取力学性能接近的具有MF和EDT两种表面形貌的各2种6016汽车铝板,系统研究了表面形貌对6016汽车铝板表面性能和成形性能的影响规律。试验结果表明:EDT铝板的表面粗糙度是MF铝板的2.5~4倍;EDT铝板比MF铝板有更高的成形极限FLD_0;MF和EDT两种铝板的表面摩擦系数、弯曲性能和拉深性能相近。

5×××系铝合金汽车板研究进展

5×××系铝合金由于具有高比强度,优良的耐腐蚀性能、成形性能和焊接性能以及可回收利用等特点,是重要的汽车轻量化材料。综述了常用5×××系铝合金汽车板的种类、性能、主要合金元素、强化机制、半连续铸锭组织,并简介了5182铝合金汽车板的塑性加工工艺、热处理工艺及其对组织的影响。

全球连续铸轧生产铝汽车板专利技术发展态势分析

随着汽车轻量化策略的持续推进,作为汽车车身应用轻量化材料的铝合金板已成为汽车轻量化领域的研发重点,而连续铸轧技术是生产汽车车身铝板较为先进的技术之一。本文通过收集德温特创新索引国际专利数据库(DII)、普若凯斯特专利数据库(Proquest Dialog)等涉及连续铸轧生产铝汽车板的专利,利用汤姆森数据分析软件(Thomson Data Analyzer)等主流情报分析工具,对连续铸轧生产汽车板技术在全球的研发现状、态势及主要技术方向,以及美国铝业公司连续铸轧生产铝汽车板专利发展态势进行分析。

全球铝合金气垫式连续热处理炉简介

简述了铝合金气垫炉的发展过程,对全球已建、在建的27台气垫炉(其中2000年后建设的有26台)进行了介绍;指出中国应加快汽车铝板的开发力度,汽车铝板用气垫炉将是今后建设的热点。

Research progress of aluminum alloy automotive sheet and application technology

Pretrcatment technology is deeply discussed to explain its importance in guaranteeing properties and form- ability of aluminum alloy automotive sheet. Some typical applications of aluminum alloy automotive sheet to automotive industry are listed. Based on the author＇s knowledge and recognition and research progress presently, the important re- search contents about aluminum alloy automotive sheet are emphasized. Reducing cost and price of sheet and going deeply into application research are the main work for expending the application of aluminum alloy automotive sheet in the automobile.

Effect of alloy composition and heat treatment on mechanical performance of 6xxx aluminum alloys

The effect of alloy composition and heat treatment, including natural ageing and pre-ageing, on the mechanical performance of eight 6xxx alloys designed with systematically varying Si, Mg and Cu contents was studied. The results show that not only the alloy composition and heat treatment before forming influence the formability, but also they have an effect on the paint bake response of the alloys. Increasing the alloy Si content, decreasing Mg/Si ratio and adding 0.3% Cu （mass fraction） were generally found to improve the tensile ductility and formability of the alloys studied, while pre-ageing was found to decrease these properties. A full property profile of these alloys in terms of strength, tensile ductility, work hardening, strain rate sensitivity, forming limit and paint bake response was presented.

Analysis of surface orange peel of aluminum-alloy automobile sheet by using of EBSD and X-ray diffraction

The formation cause of orange peel of aluminum-alloy automotive sheet after tensile deformation was analysed by using X-ray diffraction and electron back-scattered diffraction(EBSD).The test results showed that formation cause of surface orange peel after tensile deformation related to product texture and nonuniform deformation during the tensile process.The grain size has significant effect on deformation uniform and texture formation.Coarse grains were easy to produce nonuniform deformation and texture,which would produce surface orange peel after tensile deformation.

Air cushion furnace technology for heat treatment of high quality aluminum alloy auto body sheet

The process characteristics of heat treatment of aluminum alloy auto body sheet and the working principle of air cushion furnace were introduced.The process position and irreplaceable role of air cushion furnace in the aluminum alloy auto body sheet production was pointed out after the difficulty and key points in the whole production process of auto body sheet were studied.Then the development process of air cushion furnace line of aluminum alloy sheet was reviewed,summarized and divided to two stages.Based on the research of air cushion furnace,the key technology of it was analyzed,then the key points on process,equipment and control models of air cushion furnace for aluminum alloy auto body sheet in future were put forward.With the rapid development of automotive industry,there will be certainly a new upsurge of research and application of air cushion furnace for heat treatment of aluminum alloy auto body sheet.