Statistics and solutions of the problems of the terminal structure

2. The problem of preventing the screw from falling out. In this respect, I suggest using the neck to prevent it as much as possible, because it avoids the troubles caused by the tolerance accuracy of the polished rod and the collar of the screw compared with the prevention of the collar. Moreover, the reliable tolerance of the structure is easy to control.

3. The problem of salt spray test after electroplating of screws and threaded steel parts is based on the current standards for thread electroplating (the coating is limited, but the thickness of the corresponding coating of the thread is currently considered to be further determined).

There are two methods to solve this problem when the electroplating process is normal. Choosing the correct sealing agent and using electroplating for multiple plating are both methods to cover the holes that are not visible to the naked eye due to the screws.

It is costly to use a plating layer for multiple electroplating, so the first method is recommended, and the key to this method is the study of the sealing agent formulation.

4. The problem of insertion and extraction force involves more content in this aspect. It is related to materials, electroplating, structure and applied industries, and is an important mechanical performance requirement of the connector industry.

This is especially true for pluggable terminals. The choice of material is limited by conductivity (current) and contact resistance and temperature rise in terms of plugging force. No more detailed explanation is given here. Electroplating is mainly affected by the type of plating and whether it is pre-plated.

Generally speaking, after pre-plating under the same material and structure, the tablet is more stable in terms of insertion and extraction force than the tablet that is stamped and then electroplated, because the hardware material is hardened invisibly in the post-plating process , And the previous stamping just eliminated this phenomenon.

The main consideration in the structure is the contact between the tablet and the guide pin. The contact between the guide pin and the tablet is mostly line contact. There is a very unstable feeling during use, which affects its life.

If the contact between the pressure piece and the lead pin is changed into surface contact in terms of structure, then the problem of insertion force is solved and the contact resistance and temperature rise are reduced.