What are the process steps of SMT solder paste printing?

SMTThe following have been formulated to applySMTProcess Guide for solder paste Printing in the workshopsmtThe complexity of the surface mount technology (SMT) process mainly includes: solder paste printing, precise placement, reflow soldering and other processes. Among them, the quality of solder paste printing has a very significant impact on the quality of surface mount products. Let's explore this together with JJY Solder Paste Manufacturer

SMTProduction process:

1Program and adjust the placement machine

According to the sample provided by the customerBOMThe surface mount position diagram is used to program the coordinates of the positions where the surface mount components are located. Then with what the customer providesSMTCheck the first piece of surface mount processing data.

2Print solder paste

Print the solder paste through a steel meshPCBThe board needs to be soldered with electronic componentsSMDOn the solder pads, preparations are made for the soldering of components. The equipment used is a screen printing machine(Printing press)LocatedSMTThe very front end of the surface mount technology (SMT) processing production line.

3,SPI

Solder paste detector,Check whether the solder paste printing is a good product and whether there are any defects such as insufficient solder, solder leakage or excessive solder.

4Patch

Electronic componentsSMDInstall accurately toPCBAt a fixed position. The equipment used is a surface mount technology (SMT) machine, located atSMTBehind the screen printing machine in the production line.

Surface mount technology (SMT) placement machines are further classified into high-speed machines and general-purpose machines

High-speed machine: It is used for attaching components with large and small pin spacings

General-purpose machine: For components with small pin spacing (dense pins) and large volume.

5The high-temperature solder paste melts

The main process is to melt the solder paste at high temperatures and then cool it to use the electronic componentsSMDwithPCBThe plates are firmly welded together. The equipment used is a reflow soldering oven, located atSMTBehind the surface mount technology (SMT) machine in the production line.

6,AOI

The automatic optical inspection instrument is used to check whether the components after welding have any welding defects, such as standing stones, displacement, empty welding, etc.

7Visual inspection

Key items for manual inspection and testing:PCBAWhether the version is the modified one; Does the customer require the use of substitute materials for components or components of designated brands and brands?ICWhether the orientation of directional components such as diodes, transistors, tantalum capacitors, aluminum capacitors, and switches is correct; Defects after welding: short circuit, open circuit, false parts, false welding.

8Packaging

The products that pass the inspection should be packaged separately. The commonly used packaging materials are anti-static bubble bags, static cotton and blister trays. There are mainly two packaging methods. One is to use anti-static bubble bags or static cotton in rolls and pack them separately. This is currently the most commonly used packaging method. The second is in accordance withPCBACustomize the blister tray according to the size. Place it in a blister tray and unfold the package. It is mainly for those that are sensitive to needles and have easily damaged surface mount componentsPCBABoard.

That's all.SMTSolder pasteThe process steps of printing vary among different manufacturers, with different solder pastes and equipment used. When choosing solder paste, factors such as the melting point and functions of the printed product should be taken into consideration. AdditionallySMTThe debugging of solder paste printing, surface mount technology and other equipment is also very important. Professional matters should be handled by professionals. When debugging equipment, it is essential to have professional technicians from the manufacturer operate it. Shenzhen JJY collaborates mutually beneficial with electronic raw material producers and also produces solder wires, solder rods, solder pastes and flux pastes for other enterprises. With a rich variety of successful cases in the research and development of chemical raw materials, our overall strength has created a sales market that is of high quality and honest and trustworthy.