文章摘要
Quality Defect Analysis and Solutions of Airbag Bead of Belt Type Air Spring for Railway Vehicle
Received:July 09, 2021  Revised:July 09, 2021
DOI：10.12136/j.issn.1000-890X.2022.05.0369
Key Words: railway vehicle；belt type air spring；airbag；bead；mold design；quality defect；solution
Author NameAffiliationE-mail
LAI Qingcun* Qingdao Borui Zhiyuan Anti-vibration Technology Co.，Ltd laiqingcun1989@163.com 
LIU Jiajian Qingdao Borui Zhiyuan Anti-vibration Technology Co.，Ltd  
DING　Hao Qingdao Borui Zhiyuan Anti-vibration Technology Co.，Ltd  
SONG Xiangyu Qingdao Borui Zhiyuan Anti-vibration Technology Co.，Ltd  
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Abstract:
      The causes of the quality defects of the airbag bead of the belt type air spring for railway vehicles，especially the uneven thickness of the bead and the uneven platform in the bead were analyzed，and the optimization measures from the aspects of airbag curve design，mold design，diaphragm design and material distribution design of semi-finished products were put forward. In the airbag curve design，the vertical distance between the upper and lower beads needed to be increased as large as possible to ensure the mold design space. In the mold design，a rigid airtight space was designed at the airbag bead part and the function of rubber discharge was added. Therefore，the size of the airbag bead could be better controlled under the premise that the airbag mold loading and unloading were not affected. The inner diameter of the clamping edge at the lower side of the diaphragm was more than 45 mm smaller than the diameter of the airbag bead，which provided space for the design of the mold and the central mechanism. The material of semi-finished products was set with a compression amount of 10% ～ 20%. On the premise of meeting the design space of airbag bead，the appropriate size of the bead ring and the appropriate way of trimmings were selected to ensure the qualified rate of the products.
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