摘要：Impact testing is a primary method to evaluate the impact property of resistance spot welding,which is an important quality index in automotive *** testing impact properties of spot welds,many customized testers have been *** paper summarized some of the impact testers reported in open literatures and the emphasis was placed on the equipment structures,functions,technical parameters,advantages and disadvantage,*** key issues about the development of the testers such as kinematic energy input mode,fixture design,combined load testing,sensor and data acquisition were ***,the problems and prospects in the research and development of impact testers for spot welds were pointed out.

摘要：对轿车白车身轻量化的内涵、表征方法、评价参量进行了综合评述,提出了一种评价轻量化工作成效的指标——轻量化指数,探讨了轻量化设计的实施方法,并论述了汽车零部件的性能和材料性能参量之间的关系。

摘要：由于汽车工业的迅速发展,汽车产量和保有量的增多,带来了油耗、排放和安全三大问题。论述了汽车节能减排是汽车工业发展的必然趋势,轻量化是汽车节能减排的直接而有效的手段;介绍了汽车轻量化意义和轻量化工程的实施方法。塑料复合材料具有比重轻、耐腐蚀,及很强的设计性和良好的工艺性能,是重要的轻量化材料;在汽车内饰件、部分结构件应用塑料复合材料可减重60%以上。同时论述了汽车中应用量较大的釜内合金PP塑料的研究进展和典型性能,这类材料在汽车轻量化和汽车用塑料单一化中展示了广阔的前景。

摘要：With the development of automobile lightweight,it is very necessary to apply the ultra-high strength steel parts manufactured by hot stamping,which offers the possibility to reduce the weight of automobiles and maintain the safety *** order to complete hot stamping,it is important to design the structure of parts reasonably,which is related with reasonable matching of *** objective of this paper is to guide the design of parts manufactured by hot stamping and find the forming technical requirements of vehicle *** experiments,the paper obtains the stress and strain curves at different deformation temperatures and strain *** on experimental data, the constitutive relationship model is established which can reflect the deformation capacity of ultra-high strength steel during the process of hot *** with finite element simulation results of hot stamping by commercial software AUTOFORM,transfer path of load and matching law of strength,the paper determines the design criteria and forming technical requirements of parts manufactured by hot *** the same time,the impact performance of front cross member internal plate is taken into consideration.

摘要：Ls-DYNA software is adopted to conduct research of numerical simulation on hot stamping of side impact beam to calculate the temperature field distribution, stress field distribution, forming limit diagram （FLD） figure, etc. in the course of hot stamping so as to predict and analyze the formability of parts. ProCAST software is employed to conduct research of numerical simulation on solid quenching course concerning hot stamping to calculate temperature field distri- bution of tools and component of muhiple stamping cycles. The results obtained from numerical simulation can provide significant reference value to hot stamping part design, formability predication and tools cooling system design.

摘要：本文研究和开发了高强度热轧防弹钢板B900FD,设计了合金的化学成分,探讨了不同卷取温度对防弹钢组织、力学性能的影响;对防弹钢板进行了枪击试验,同时对枪击后着弹点的变形特性和组织进行了分析;进行了加工工艺试验和焊接试验。结果表明,高强度热轧防弹钢板B900FD具有优良的强韧性匹配性能,枪击性能可以满足防弹板的要求,其加工性能、可焊接性可以适应现有生产工艺,同时降低了生产成本。本钢板的综合性能指标达到了《专用运钞车防护技术条件》(GA164—2005)的要求。

摘要：针对某乘用车钢制前端框架和技术性能要求,通过长纤维增强热塑性复合材料(LFT)机械性能对比分析,结合LFT前端框架生产工艺和制造成本,确定选用PP-LGF30粒料进行LFT前端框架开发。通过汽车前端框架集成设计,对多目标优化设计后的结构,进行了模流分析,确定了最终设计方案。基于零件3D图,开发了模具,应用注塑成形的方法试制了LFT前端框架,对试制件进行了多项台架测试和整车匹配验证。结果表明:各项指标达到使用要求,LFT前端框架相比传统钢制件,减重比例达到56%,取得了良好的轻量化效果。

摘要：针对某车型前防撞梁零件开发热成形模具,并进行热冲压成形试验,对成形后的零件进行激光扫描以及金相组织、显微硬度和力学性能检测。结果表明:所试制的零件形状符合设计要求,热成形后零件为马氏体组织,显微硬度在HV400以上,样件屈服强度在1 000 MPa以上,抗拉强度在1 400 MPa以上,断后延伸率在10%以上。

摘要：22MnB5热成形高强钢的Nb合金化可细化晶粒、提高强韧性,但Nb合金化对其电阻点焊性能的影响尚需进一步探明。本工作设计、制备了22MnB5、22MnB5Nb热成形钢的点焊试样及等效热处理试样,并对试样组织性能进行了测试。研究发现,对于点焊试样,Nb的添加细化了焊点区域的晶粒,拉伸峰值载荷有所降低(降幅在7%以内),焊点硬度范围缩窄,但未改变失效模式以及焊点各区域材料组织类型;对于等效热处理试样,Nb的添加同样细化了晶粒且未改变焊点区域的组织类型,但对试样硬度和抗拉强度的影响很小,断后伸长率普遍有所降低。

摘要：基于现有热成形零件冷弯性能不足、氢脆敏感性强等共性技术问题,在22MnB5钢的基础上采用Nb、V微合金化的设计思路,对试验钢的显微组织、淬透性和极限尖冷弯性能进行研究。结果表明:微合金化前后22MnB5热成形钢的显微组织均为全马氏体,但是微合金化后的试验钢组织更为细小;Nb-V微合金化能有效提高22MnB5热成形钢的淬透性,其淬硬层深度达到13~14 mm,并且试验钢的极限尖冷弯角达到58°~72°,进一步拓宽了热冲压成形的工艺窗口。综合分析试验钢微观组织、淬透性能及极限尖冷弯性能的检测结果,添加0.04%Nb和0.04%V实现复合微合金化,提升材料的综合强塑性,满足了高冷弯性能汽车零部件用材需求。