A tool often used for reworking surface assembly components. ElectrIC soldering iron is the main repair tool. Ordinary internal heat type electric iron is the heating wire around a ceramic rod, and then covered with ceramic tube insulation. When in use, the iron head is set outside the ceramic tube, and the heat is transferred from the inside to the outside of the iron head. The following SMT processing manufacturers to explain how to improve the production efficiency of SMT patches and how to choose SMT processing related knowLEDge. The following patch processing manufacturers will explain how to operate the repair in patch processing and how to repair the relevant knowledge of the components in patch processing.
1. How to repair components in patch processing
What does the chip element refer to in SMT? According to Gerfan's understanding, the normal Chip component refers to the chip resistor, capacitor, inductor. We said before that SMT processing process includes repair. Do you know what can be used for the repair of chip components? For the repair of Chip components in Wuxi patch processing, you can use ordinary anti-static electric soldering iron, or you can use a special pliers soldering iron to heat the two ends at the same time. Repair of Chip components in SMT is relatively SIMple. Chip components are generally SMAll, so when heating it, the temperature should be controlled properly, otherwise too high temperature will cause the components to be damaged by heat. Generally, the duration of the soldering iron on the pad shall not exceed 3 s when heating. The core of its technological process is: the diswelding and disassembling of chip components, the cleaning of pad and the assembly and welding of components.
1. Dewelding and disassembling of chip components
(1) If there is coating layer on the component, the coating layer should be removed first, and then the residue on the working surface should be removed. (2) Install the hot clip iron head with appropriate shape and size in the hot clip tool. (3) the temperature of the iron head is set at about 300 dragons, which can be changed appropriately according to needs. (4) The two solder joints of the chip element are coated with flux. (5) Remove oxides and residues on the tip of the iron with a wet sponge. (6) Place the soldering iron head above the chip element, and clamp both ends of the element and contact the solder joint. (7) Lift the element when the solder joints at both ends are completely melted. (8) Place the removed element in a heat-resistant container.
2. Clean pad
(1) The selection of chisel-shaped iron head, the temperature is set at about 300 dragons, can be made according to the need for appropriate changes. (2) Brush flux on the welding pad of the circuit board. (3) Remove oxides and residues on the tip of the soldering iron with a wet sponge. (4) Place the soft tin-absorbing braided tape with good solderability on the pad. (5) Gently press the soldering iron head on the tin absorbing braid belt. When the solder on the pad is melted, slowly move the soldering iron head and braid belt to remove the residual solder on the pad.
3. Assembly and welding of chip components
(1) Choose the right shape and size of the iron head. (2) The temperature of the soldering iron head is set at about 280 Y, which can be changed as required. (3) Brush the flux on the two pads of the circuit board. (4) Remove oxides and residues on the tip of the iron with a wet sponge. (5) Apply an appropriate amount of solder to a pad with an electric soldering iron. (6) Clamp the chip element with the insert, and connect one end of the element with the solder plate that has been tinned with an electric iron to fix the element. (7) Weld the other end of the component with the pad with the electric iron and the soldering wire. (8) Weld both ends of the components with the pad respectively.
2. How to operate the repair during patch processing
"If you want to do a good job, you must first improve the tool", to do a good job of repair work, patch processing must be familiar with and can correctly choose the right tools. A tool often used for reworking surface assembly components. Electric soldering iron is the main repair tool. Ordinary internal heat type electric iron is the heating wire around a ceramic rod, and then covered with ceramic tube insulation. When in use, the iron head is set outside the ceramic tube, and the heat is transferred from the inside to the outside of the iron head. Ordinary external heat type electric soldering iron is the heating wire around an iron pipe with a hole in the middle, inside and outside with mica insulation, the iron head is inserted in the middle hole, the heat is transferred from the outside to the inside of the iron head.
SMT plant commonly used in the two kinds of ordinary electric soldering iron price is low, suitable for general electronIC components welding. Among them, the internal heat heating fast, will not produce induction electricity but heating wire life is short, the external heat type life is relatively long, but easy to generate induction electricity, easy to damage precision electronic components, welding precision components when the best iron shell with a ground wire. Ordinary electric iron power is fixed, but the temperature can not be controlled, long time use will make the temperature rise, will burn the electric iron damage the iron head. There is a temperature controller in the constant temperature electric soldering iron. When the temperature of the iron reaches the set value, it stops heating, improves the welding quality and extends the life of the iron.
SMT patch processingunder special circumstances For some ultra-small components or pin dense and number of components, it is not suitable to use the soldering iron for repair, but should use the repair table for repair. The repair table uses special fixtures to fix the electronic components that need to be repaired. Using industrial computer touch screen to access or modify equipment parameters, and through the temperature curve control heating temperature, to achieve accurate control of the disassembly and welding process of electronic components. The above is the specific operation method of repair tool in patch processing!