Printed circuit board assembly
In order to make the pcb assembly components neatly arranged on the printed circuit board, and to avoid re-soldering, it is also a very important step to form the leads on the components. It is usually formed with needle-nosed pliers or tweezers. There are various forming types of components leads , basic molding methods, bending forming methods, vertical insert molding methods, and integrated circuit molding methods.
2. Pcb assembly component leads and wire ends pre-weld treatment
In order to ensure the quality of the weldments, the pcb assembly components must be removed from the leads and soldered before soldering. The wire with insulation layer cuts the wire according to the required length, determining the length of the stripping head and according to the connection mode of the wire, and the stranded wire is processed and attaching tin, so that the lead wire can be electrically connected after being connected to the pcb assembly circuit board. Can withstand a certain amount of tension without causing breaks.
3. Inserting method of components
Axial symmetrical components such as resistors, capacitors, and semiconductor devices are commonly used in both horizontal and vertical ways. Which plug-in method is used depends on the design of the circuit board, and the specific requirements are considered. After the pcb assembly components are inserted into the circuit board, the lead wire should be kept certain length after passing through the pad, generally about l-2mm, in-line type, the pin does not bend after passing through the welding pad, and the de-soldering is convenient, the method bends at 45 degrees, has a certain mechanical strength, is fully bent, and the lead is bent at about 90 degrees. It has high mechanical strength, and attention should be paid to the direction in which the lead wire is bent in the welding pad.
4.The welding of components
When soldering the components, the printed circuit board is divided into unit circuit boards etc
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