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干式薄壁气缸套支承肩根部空刀槽部位断裂,俗称掉台。该故障一般发生在:(1)装配时压入机体过程中临近空刀槽部位及其附近时;(2)装配后镗削缸套内孔或珩磨内孔时;(3)发动机磨合初期;(4)发动机工作早期。从断口的形态上看,一般可分为:(1)平口,即沿某一截面整齐断裂;(2)锯齿口,即沿某一截面或斜截面呈锯齿形断开;(3)多块状断口,即连同支承肩在内碎裂成若干块,一般无规律可循。生产中,人们普遍认为,产生掉台的主要原因为:
Dry thin-walled cylinder liner supporting shoulder root part of the empty slot fracture, commonly known as the fall. The fault usually occurs in: (1) When the body is pressed into the body near the empty slot and its vicinity during assembly; (2) When the inner bore of the cylinder liner or honing bore is assembled after assembly; (3) (4) early engine work. From the fracture point of view, the general can be divided into: (1) flat mouth, that is, along a certain section neat fracture; (2) serrated mouth, that is, along a cross-section or oblique section was zigzag-shaped disconnect; (3) Fracture-like, that together with the supporting shoulder fragmentation into a number of pieces, generally no law to follow. Production, it is generally believed that the main reasons for the fall because: