1.Features:
The fracture site of the core rod is inside the ball head or socket, and the tensile value is very low.
2. Cause analysis:
2.1 The pressure relay is too strong. Damage caused by exceeding the compressive strength of the core rod;
2.2 The crimping part is not suitable. The pressure block should be located in the middle of the connection area;
3. Poor machining accuracy of metal fittings:
3.1 Eccentricity
3.2 insufficient cylindricity
3.3 and pinhole in the inner hole;
4. Uneven material of the same batch of fittings (especially sockets) and hardness issues during heat treatment;
5. Poor polishing of the core rod results in taper or insufficient cylindricity at the end;
6. The stability of the crimping machine itself is poor, and the six or eight claws are not synchronized.
7. The high hot bending resistance value of the core rod causes it to become brittle
8. When assembling metal fittings and core rods, the ball head and socket are not on the same straight line and are subjected to shear forces.
