There are three or four holes in the shell, more than ten or twenty, the workers in the process of wearing the shell kept working for a long time, and the number of holes is more, it is easy to be careless to insert the wrong order of the line, the line was supposed to insert this hole but inserted into the hole next to it.

2. Poor thread cutting

In the process of thread cutting, the incision is not tidy and the copper wire is damaged. For this reason, we should make corresponding knife value adjustment for different specifications of wire before starting up, and we should have appropriate trial products before quantity.

3. The terminal (end pressure) is not good

In this process is generally the location of the terminal is not appropriate, the terminal did not completely cover the copper wire, the terminal is too wrapped lead to insert broken skin and so on bad, these bad generally appear in the manual terminal operation, with automatic terminal as long as the machine is adjusted, the probability is small.