1) Riveting looseness: the riveting is disengaged under the use of tensile force, shear force or other cyclic loads.
Cause: the flanging is not fully opened, the flanging pressing area is too narrow, and the flanging is broken.
Prevention: a. the height of budding shall be in place to avoid budding into continuous flower opening and splitting shape or vertical cone shape.
- Increase the uniform pressure, and increase the preloading during riveting to avoid staggered assembly before riveting.
2) Excessive riveting:
The sprouting is higher than the allowable height after flanging.
Reason: the flanging is not fully opened, and the wall thickness of budding is too large.
Prevention: reduce the wall thickness, increase the riveting force, increase the taper of riveting punch, etc.
3) workpiece deformation in riveting area: convex, concave and twisted around, etc.
Cause: the riveting is too dead and the formwork is deformed.
Prevention: the mold or machine shall be limited, and the mold shall be maintained regularly.
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