廖赞学，汤保良

摘  要：硬塑仪表板的乘客安全气囊在进行低温和高温爆破试验时，出现了气囊盖铰链断裂及破碎飞溅等问题。经过对裂口和碎片的形态进行分析，找出失效原因，制定了在气囊门内壁预埋织布、调整气囊盖的激光弱化线轨迹及尺度参数、加强气囊框的焊接强度等优化方案，并进行多次验证，最终实现气囊高低温爆破试验的气囊盖正常展开。本文对气囊盖的试验验证设计优化过程进行了研究和总结，归纳出能够避免气囊盖爆破发生断裂和飞溅的设计方法和参数，以期为后续新项目类似结构的气囊盖的设计提供参考和指导。

关键词：仪表板;气囊盖;破碎

中图分类号：U463.7     文献标识码：A     文章编号：1005-2550（2021）05-0032-05

Design Improvement of PAB Cover Unfold Failure of Rigid

Plastic I/P

LIAO Zan-xue， TANG Bao-liang

（ Dongfeng Motor Company Technology Center， Wuhan 430058， China）

Abstract： When the PAB of the rigid plastic I/P was subjected to low-temperature and high-temperature blasting tests， the PAB cover hinges were broken， fracture and splashed. After analyzing the morphology of the cracks and fragments to find out the reasons for the failure， the optimization plan was formulated to embed fabrics on the inner wall of the PAB door， adjust the laser weakening line trajectory and scale parameters of the airbag cover， and strengthen the welding strength of the airbag frame. After many verifications， the airbag cover of the airbag high and low temperature blasting test was finally unfold normally. This paper studies and summarizes the design optimization process of the PAB cover test verification， and summarizes the design methods and parameters that can avoid the breakage and splashing of the PAB cover blasting， in order to provide reference and guidance for the design of the PAB cover with similar structure in subsequent new projects.

1    引言

在車型的迭代开发中，为保证乘客安全气囊的平台化和通用化，全新造型的仪表板通常沿用基础车的安全气囊模块，故气袋的折叠方式不会改变。但由于新造型的特征限制，气囊盖的撕裂线由H型变成了U型，在安全气囊的高低温爆破试验时，气囊盖出现铰链断裂和破碎飞溅等问题，未满足气囊盖的设计要求。为避免气囊爆破产生飞溅物伤及乘客，需对气囊盖的结构进行设计优化，解决气囊盖断裂和破碎飞溅的问题。

2    硬塑仪表板的气囊框结构与弱化形式

仪表板的乘客安全气囊盖，主要有显式有缝气囊盖和隐式无缝气囊盖[1]两种。为保证仪表板外观的完整性，提升仪表板的视觉品质，目前多采用隐式无缝安全气囊盖。……