On the automatic surface mounting line, if the PCB is not smooth, it will cause inaccurate positioning, components cannot be inserted or affixed to the holes of the board and the surface mounting pad, and even crash the automatic inserting machine.
PCB deformation causes can be divided into thermal stress and mechanical stress. The thermal stress is mainly produced in the process of pressing, and the mechanical stress is mainly produced in the process of stacking, handling and baking.
PCBA is one of the basic components of electronic components, PCB it through surface assembly technology (SMT), and the whole process of DIP plug-in insertion, known as PCBA process.
Soft and hard combination board is considered appropriate and the use of rigid (FR4) materials and flexible (PI or PET) materials combination, is a kind of both rigid PCB durability and flexible PCB suitable force of the new printed circuit board.
Several parts of the circuit board are mainly: 1. Bare copper plate: 2. Gold plate: 3. Spray tin circuit board: 4. OSP process board is also called organic welding film in SMT factory.
In the process of PCB production, the physical and chemical properties of each material are different, and the thermal stress residual generated in the pressing process leads to the bending and warping of the board.
The base material of printed circuit board is usually glass fiber reinforced phenolic resin or epoxy resin, and various components are welded on it. The composition is very complex, including a variety of metals, which has high resource recovery value.
Three anti paint has satisfactory high and low temperature resistance; It cures into a transparent film that tries to protect the circuit from damage in such conditions as chemicals, shock, moisture, salt spray, moisture and high temperatures.
With the gradual development of electronic products to fine and intelligent, more materials are applied in them. Understand the characteristics of various materials used in the product, and adopt more suitable laser processing technology and process.
If the contact or line on the PCB circuit board needs to contact with the parts over and over again, with the passage of the product office hours, the appearance of the metal will reveal a certain wear, so the contact is not good.
PCB proofing refers to the trial production of PCB before mass production. After the electronic engineer presets the circuit and completes the PCB Layout, he carries out the process of small batch trial production to the factory, that is, PCB proofing.
Circuit presets and circuit board presets are designed to produce satisfactory circuit boards and successfully achieve the value of research and development and the target of mass production.
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