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发表于 5-9-2009 12:07:49
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1.dust cover 的材质选择,针对此零件需要做的试验有: 
1)dust cover tear strength ,evaluation method  refer to ASTM D 624,MES  evaluation standard is 392N/CM  or more. 
2) dust cover durability ----weatherability ,conditions according to ASTM D 1171,testing time should be 72 hs ,set the ball stud at the maxmuim oscillation ,evaluate the presence of the cracks and the abnormal deformation of the dust cover. 
3.low-temperature sealability ,put the testing sample in the thermosatic champer kept at -35 degrees for 2hs .perform the maximum rotation and oscillation of the ball stud each 3 times immediately..evaluate the grease ,presence of the dust cover cracks and deformation ,clearance between the joining parts . |   
 
 
 
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