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SMT production line and placement machine and quality control
PCBA Tech
SMT production line and placement machine and quality control

SMT production line and placement machine and quality control

2021-11-10
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Author:Downs

The following is an introduction to the nine main equipment supporting the SMT production line and the smt placement machine

One, solder paste mixer

The solder paste mixer can efficiently mix the tin powder and the solder paste evenly. Achieve a more perfect printing and reflow soldering effect, save manpower and standardize this operation. In this way, the jar does not need to be opened and the chance of absorbing water vapor is reduced.

Second, the oven

When necessary, bake the pcb circuit board to remove the moisture of the pcb circuit board.

Three, SMT board machine

Used as PCB to be placed in the Rack (turnover box) to automatically send the board.

Four, solder paste printing machine

Used for printing PCB circuit board solder paste, equipped in front of smt placement machine.

Five, SPI solder paste thickness gauge

After used as a solder paste printer, it is a device to measure the thickness, area and volume of the solder paste (red glue) printed on the PCB board.

Six, reflow oven

pcb board

The reflow soldering furnace is the back process of the SMT production line, which is responsible for melting the solder of the PCB pcb circuit board and the components that have been mounted and bonding it with the main board. There are many types of reflow ovens, such as hot air reflow oven, nitrogen reflow oven, hot wire reflow oven, hot air reflow oven, laser reflow oven, etc., which are equipped behind the smt placement machine.

Seven, AOI detector

After being used as an smt placement machine, this is called pre-welding inspection, which is used to detect poor placement of components before soldering, such as offset, reverse, missing parts, reverse white, and side standing of electronic components; also It can be used as the back of the reflow oven. This is called post-soldering inspection, which detects the poor soldering of electronic components after the reflow oven, offset, missing parts, reverse re-inspection and solder joints with more tin and less tin. Defects such as empty welding.

8. SMT connection station

Used as a connecting device in the middle of connecting SMT production equipment.

Nine, SMT off-board machine

Mainly used for receiving and storing PCB circuit boards after reflow soldering.

The SMT production line is divided into automatic production line and semi-automatic production line. If the manufacturer wants to build a complete automatic SMT production line, the smt placement machine is the most important equipment. The other nine types of equipment are also indispensable. The manufacturer can also equip some according to needs. Other SMT peripheral equipment (such as: plate turning machine, falling plate machine, parallel transplanting machine, etc.).

Quality control in SMT production

Although standard and standardized processing technology operating procedures management is implemented in SMT production, in the actual production process on site, some undesirable phenomena that do not meet the processing technology requirements are often found. According to the standard specifications and requirements of total quality management, it must be Sort out these defective products, and conduct in-depth analysis and treatment of these defective products.

1) Establish a document standard system for quality control during SMT production and processing

Create SMT product quality inspection rules and regulations.

Formulate SMT product quality inspection standards and specifications.

Formulate visual inspection, AOI inspection, ICT inspection and FCT inspection operation specifications.

Standardize the use guidance of testing equipment (AOI tester, ICT tester and FCT tester).

Develop inspection record reports or labels.

Common precautions for standard equipment operation.

2) On-site management of product quality inspection in SMT production

Professional and trained quality management and inspection personnel strictly abide by the inspection process of SMT product quality inspection rules and regulations. Set visual inspection or AOI inspection after solder paste printing, visual inspection after placement, visual inspection or AOI inspection after reflow soldering, ICT and FCT inspection after wave soldering, and assembly afterwards Visual inspection and product quality inspection; all inspections are based on inspection standards and specifications to determine whether the product is good or bad, and the inspection results are recorded for future reference or corresponding labels are affixed to the products; all equipment is used correctly according to the instructions for use; all inspection processes are as per Standard procedures are carried out, and corresponding records are made; and so on. For example, the requirements for ICT testing (common precautions): the machine is operated by dedicated personnel, non-designers are not allowed to operate or modify the program without approval and consent, and irrelevant personnel are prohibited from using the machine's computer; operators must wear qualified electrostatic rings or electrostatic gloves, Metal ornaments are not allowed; when placing the board, hold it lightly to avoid damage to the components; if the machine fails or the same bad condition is found three times in a row, the corresponding engineering and management personnel must be notified immediately to deal with it, and the inspection can proceed to the next process. Operation steps for ICT testing: check the material number, scan the operator code, take the board to be tested, open the socket cover, visually inspect, load the plate, close the cover, scan the main screen, take the test result, open the cover, take it out Test board.