During the Pcb manufacturing process, what are the details that must be paid attention to?

Inside each production plant, there will be an SMT processing line. On this line, we can divide into the following sections.

1. Lead-free solder paste printing machine

In this part, the machine we use is an SMT semi/automatic printing machine. In this operation, we should pay attention to the stencil and PCB sections, the steel mesh and the PCB welding pads must be completely coincident, and after three tests that normal production can begin After printing each PCB, it must be self-tested. Solder paste printing does not allow many tin bars, tin migration and other defective phenomena. Printing defective products should be carefully cleaned. Wipe the wire mesh in time. Timely replenishment to ensure the amount of stencil rolling of the solder paste.

2. Mounting of small size materials

The machine used in this process is a CP machine. Quickly install materials. Before starting, the work that needs to be done, such as the placement of materials, the positioning of the machine, should be prepared to fill the material when the yellow light of the machine is on.

3. Mounting of large size materials

This process is designed to help large materials in the PCB to be added to the CP machine that cannot be installed. In this link, we used the XP machine. It can achieve huge automatic installation of materials. The notification process is similar to the CP.

4. Pre-furnace QC

This link is an important part of the overall SMT craft. This process ensures that all semi-finished products are completely problem-free at the time in the furnace, so it is called the QC of the furnace. This post is usually used in QC to check the exhaustion of the machine from the PCB board. To see if there are any problems with leaks, some materials, etc. Then, manually or partially correct the leak or part of the material.

5. Reflow soldering

Its function is to reflow the solder paste so that the material is welded to the circuit board. This process requires a wave soldering machine. Wave soldering should point out that there are several points. The first is the temperature adjustment in the furnace, which needs to take into consideration the degree of heat resistance of the heat and material in the PCB board, and then set the optimum temperature so that there is basically no problem in the PCB board in the furnace.

6.Post- furnace QC

Quality is the life. In the furnace, there are certain problems, such as air welding, welding seam, etc. So how do you find these problems? We must strictly control this link and then manually modify it.

7.QA sampling

When all the automatic post-assembly processes have disappeared, we have the final step, which is sampling. This step of sampling can roughly calculate the pass rate of our products, which is the quality. Of course, sampling must be done carefully every step, do not miss the layout of each detail, thus ensuring the quality of the company's products.

8.Storage

Final storage. Storage also needs to pay attention to packaging, not sloppy. This can provide a perfect experience for customers.