SMT steel net production and acceptance should pay attention to what matters?
Steel-mesh fabrication is crucial to the SMT process, which will directly determine whether the tin on each solder pad is uniform and full, thus affecting the welding reliability of SMT components after reflow soldering.Generally speaking, it is necessary to carefully analyze the characteristics of each PCB to open the steel mesh. For some circuit boards with high precision and quality requirements, laser steel mesh must be adopted. Besides, SMT engineers need to conduct a meeting to discuss and confirm the process flow, and adjust the aperture of the opening appropriately to ensure the tin loading effect.
When making SMT steel mesh, it is generally noted that:
1.ME makes steel mesh according to relevant documents and materials provided by the engineering department.
2. Frame size requirements of steel grid (550MM*650MM 370MM*470MM, etc.) are mainly based on the structure of the printing press and product specifications.
3. Marking on steel mesh (product model, thickness, production date, etc.)4. Thickness of steel mesh (generally, the scraping glue is 0.18mm-0.0.mmm, and the scraping tin is 0.1mm-0.15mm)
5. Open mode and size of the steel mesh (generally open V, U, concave, etc. of the tin bead, specific shall be determined according to the type of each component).
6. The direction of the feed plate and the patch machine should be unified
SMT steel net
Notes for acceptance of SMT steel net:
1. Check whether the way and size of the steel mesh openings meet the requirements
2. Check whether the thickness of the steel mesh meets the product requirements
3. Check whether the steel mesh frame size is correct
4. Check whether the label of the steel mesh is complete
5. Check whether the flatness of the steel mesh is horizontal
6. Check whether the tension of the steel mesh is OK
7. Check whether the position and quantity of steel mesh openings are consistent with GERBER documents
Steel mesh making is an important part of quality control of the whole SMT processing process. Engineers must pay full attention to it. Customers should not deliberately reduce costs, resulting in poor tin loading effect after using the steel mesh and affecting the whole production schedule.
PCB manufacturer reflow soldering machine heating system The full hot air and infrared hea...
Types and advantages of flexible pcb circuit board The PCBA board is the finished product after t...
What are the SMT process Everyone knows that the electronic products we use in our lives are ass...
What is the difference between PCB and PCBA What is a PCB PCB = printed circuit board; PCB is an ...