PCBA Tech - Understand PCBA crimping technology and material issues

Understand PCBA crimping technology and material issues
PCBA solderless press-in connection technology, also known as crimping technology, is a kind of "appropriate press-in" connection formed by elastically deformable terminals or rigid terminals embedded in double-sided or multilayer printed board metallized holes., A close contact point is formed between the terminal and the metallized hole, and the electrical connection is realized by mechanical connection.
The crimping technology has high reliability, plug-in safety and easy operation, avoiding the problem of excessive heat absorption of the connector during reflow soldering, and will not cause damage or breakage of the plug of the connector; at the same time, it does not need Solder and flux solve the problems of difficulty in cleaning the welded parts and easy oxidation of the welding surface. Therefore, the crimping technology continues to this day and is still widely accepted and used.

The key factors of PCBA crimping technology:

1. Press-in terminal; 2. Printed board; 3. Crimp process; 4. Crimp tools and equipment

Press-in terminals (crimped pins) are divided into rigid pins and flexible pins (as shown in the figure). The rigid pin will not deform during the crimping process, but the hole will deform:

PCB rigidity and flexibility

The flexible pin will be squeezed and deformed during the crimping process, and the hole will not be deformed.

The crimping should be made of copper alloy of appropriate level. Such as copper tin alloy, bronze copper zinc alloy, brass or beryllium copper alloy.

The choice of material not only depends on the size and function of the part, but also must be compatible with the requirements for a good and stable electrical connection.

All materials are related to time, temperature and stress to produce stress relaxation.

The terminal material and structure are such that the force to maintain the connection does not decrease from time to time so that the electrical resistance at the connection increases to an unacceptable level.
The entire PCBA processing process is a complicated process that requires detailed control. Any quality problems with SMT patches or even PCB light boards may cause product defects.
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