前保险杠设计的主要功能是吸收外部冲击力，在车辆或驾驶员受到冲击力时产生缓冲，起到保护人和车辆的作用。同时，前保险杠的合理设计将对保护行人起到一定的作用。因此近年来，人们在设计前保险杠系统时越来越关注这个问题。但除了保持前保险杠原有的保护功能外，人们也越来越注重前保险杠与整车外形的和谐统一，同时保证了自身的轻量化。所以汽车的前保险杠基本上是聚丙烯（PP）树脂材质的。 聚丙烯（PP）树脂材质保险杠主要由保险杠格栅、吸能块以及其本体三部分组成。聚丙烯（PP）树脂材质保险杠在使用过程中具有较好的机械强度、较高的刚度以及外表比较光滑漂亮。汽车前保险杠的作用主要从两个方面体现：首先它是在汽车发生碰撞时，保护人们生命安全的第一道防线，它能有效的降低碰撞时的冲击力，最大程度的保证乘车人以及行人的安全。其次PP材质的汽车保险杠外观非常漂亮有光泽，与整个车身放在一起看协调一致，十分符合现在人们的审美观。 同时我们主要利用CATIA等三维建模软件对汽车前保险杠进行建模与分析。 关键词汽车前保险杠；结构设计；材料选择；低速碰撞；CATIA建模 Abstract Due to the rapid developme
nt of the world eco
nomy a
nd the level of scie
nce a
nd tech
nology, people are i
ncreasi
ngly year
ni
ng for a better life, which directly promotes the rapid developme
nt of the automobile i
ndustry. Chi
na's domestic automobile ma
nufacturi
ng scale is also growi
ng rapidly, a
nd the domestic market dema
nd for automobiles is also growi
ng rapidly. At the same time, with ma
ny families i
n our cou
ntry have their ow
n private cars, which leads to the curre
nt traffic accide
nts are also freque
nt. Therefore, i
n additio
n to the drivi
ng experie
nce a
nd appeara
nce, people pay more a
nd more atte
ntio
n to the safety of the car. As the first li
ne of defe
nse for automobile safety, the fro
nt bumper has become o
ne of the importa
nt topics i
n automobile safety desig
n at home a
nd abroad. The mai
n fu
nctio
n of the fro
nt bumper desig
n is to absorb the exter
nal impact force, produce buffer whe
n the vehicle or driver is impacted, a
nd play the role of protecti
ng people a
nd vehicles. At the same time, the reaso
nable desig
n of the fro
nt bumper will play a certai
n role i
n protecti
ng pedestria
ns. So i
n rece
nt years, people pay more a
nd more atte
ntio
n to this problem whe
n desig
ni
ng the fro
nt bumper system. But i
n additio
n to mai
ntai
ni
ng the origi
nal protectio
n fu
nctio
n of the fro
nt bumper, people also pay more a
nd more atte
ntio
n to the harmo
ny a
nd u
nity of the fro
nt bumper a
nd the vehicle shape, while e
nsuri
ng their ow
n lightweight. So the fro
nt bumper is basically made of polypropyle
ne (PP) resi
n. PP resi
n bumper is mai
nly composed of three parts: bumper beam, e
nergy absorptio
n block a
nd its body. The bumper made of polypropyle
ne (PP) resi
n has good mecha
nical stre
ngth, high rigidity a
nd smooth appeara
nce. The fu
nctio
n of automobile fro
nt bumper is mai
nly reflected i
n two aspects: first, it is the first li
ne of defe
nse to protect people's life safety i
n the eve
nt of automobile collisio
n, which ca
n effectively reduce the impact force i
n the collisio
n a
nd e
nsure the safety of passe
ngers a
nd pedestria
ns to the greatest exte
nt. Seco
ndly, the appeara
nce of PP automobile bumper is very beautiful a
nd glossy, which is i
n harmo
ny with the whole body, a
nd very i
n li
ne with people's aesthetic view. At the same time, we mai
nly use CATIA a
nd other three-dime
nsio
nal modeli
ng software to model a
nd a
nalyze the fro
nt bumper. Key words automobile fro
nt bumper structural desig
n material selectio
n low speed collisio
n CATIA modeli
ng 目录 摘要I Abstract II 1绪论1 1.1前言1 1.2汽车前保险的设计要求2 2汽车前保险杠的简介3 2.1汽车前保险杠的分类3 2.2汽车前保险杠的功能与作用3 2.3汽车前保险杠的材料3 3汽车前保险杠的选材5 3.1汽车前保险杠的材料的选择5 3.2汽车前保险杠材料的改性5 3.3汽车前保险杠的涂料设置5 4汽车前保险杠的制造工艺8 4.1前保险杠系统的结构组成8 4.2前保险杠本体的工艺设计8 4.2.1孔的设计9 4.2.2圆角的设计9 4.2.3壁厚的设计10 4.2.4脱模角度的设计10 4.2.5加强筋的设计11 4.3汽车前保险杠的成型方法11 4.4汽车前保险杠的模具生产12 5汽车前保险杠系统的设计要求14 5.1汽车前保险杠的设计法规14 5.2汽车前保险杠的碰撞仿真14 6汽车前保险杠的安装与部件设计18 6.1汽车前保险杠的定位与安装18 6.2汽车前保险杠横梁系统设计19 6.3汽车前保险杠格栅的设计21 7汽车前保险杠的建模22 7.1汽车前保险杠建模前的准备22 7.2前保险杠本体的具体建模过程22 结论24 致谢25 参考文献26